Method to manufacture cast-in-place piles

FIELD: construction.

SUBSTANCE: method to manufacture cast-in-place piles consists in suspension of a casing pile to a pile driver, its resting against soil, filling the lower part of the casing pipe with a loose material and its compaction with a falling hammer of the pile driver to form a plug in the casing pipe, afterwards the casing pipe is submerged to the specified elevation by hitting the plug with the hammer, and then by dropping of the hammer from high altitude, the plug is knocked out with simultaneous formation of bottom broadening under the casing pipe, installation of a reinforcement frame and concreting of a pile shaft with simultaneous withdrawal of the casing pipe. After the casing pipe achieves the design elevation, the plug is pushed out with the help of higher strikes of the hammer until it starts moving, at the same time with every hit, while pushing the plug, the casing pipe is withdrawn to the height from 2 to 3 cm, and after pushing the plug to the depth equal to the half of the casing pipe diameter, withdrawal of the casing pipe is stopped, and it is again driven into soil with at least 20 hits of the hammer. The plug is pushed out leaving its safe remainder, at the same time the plug material forms an integral part of the pile foundation. The additional amount of loose material is added to the casing pipe, which is rammed using the hammer with simultaneous withdrawal of the casing pipe, thus forming a broader pile foot. Prior to installation of the reinforcement frame, the casing pipe is set into the finished pile foot, and the plug remainder is fully pushed out. The reinforcement frame is installed into the casing pipe with its forced deepening into strong bearing soil, and the entire pile body is concreted by means of continuous laying of cast concrete with simultaneous raising of the casing pipe.

EFFECT: higher rates of pile body concreting, increased bearing capacity of a cast-in-place pile due to reinforcement of weak soils, reduction of material intensity and labour intensiveness.

15 cl, 5 dwg

 

The invention relates to the Foundation and may be used in the device of piles.

A known method of manufacture of piles, which consists in suspending the casing to copra, resting it on the ground, filling the lower part of the casing of bulk material and the seal of the falling hammer copra to education in the casing tube, after which the casing is immersed to a predetermined level by applying hammer blows on the tube, and then by dropping the hammer with a greater height produce knockout tube with simultaneous formation of the broadening of the heel under the casing pipe, the installation of the reinforcing cage, and concreting of the pile shaft by the method of compaction with simultaneous extraction of the casing /1/.

The disadvantage of this method are the cost of a great time for monitoring: (a) strict adherence to the consistency of concrete: too soft consistency it is impossible to utrambovyvanie that can lead to the formation of the neck below the level of the pipe; b) performing a sealing tube as low as possible altitude, as if too large a height of the sealing tube in the process of compaction of concrete reinforcement cage goes down and will davlen, and the pile may be damaged below the bottom of the pipe, at the same time when removing the casing pipe may odnovremenno removing the C complete pile reinforcement cage; with the exception of the output of the bottom of the hammer below the bottom of the pipe because of the potential risk of flood and pollution of concrete piles with soil; providing a protective layer of concrete in piles in weak or soft soils.

The present invention is the elimination of the above drawbacks and increase the rate of concreting body piles.

The problem is solved due to the fact that in the method of manufacture of piles, which consists in suspending the casing to copra, resting it on the ground, filling the lower part of the casing of bulk material and the seal of the falling hammer copra to education in the casing tube, after which the casing is immersed to a predetermined level by applying hammer blows on the tube, and then by dropping the hammer with a greater height produce knockout tube with simultaneous formation of the broadening of the heel under the casing pipe, the installation of the reinforcing cage, and concreting of the pile shaft with simultaneous extraction of the casing, and after reaching casing pipe the design of the label, carry out ejection of the plug by means of hammer blows from a greater height until then, until she comes in motion, with each stroke, pushing the tube, remove the casing to a height of 2 to 3 cm, and, after the ejection tube to a depth equal to p is half of the diameter of the casing, stop removing the casing and its newly hammer into the ground at least 20 blows of the hammer, then plug knock out, leaving her safe residue, and the material of the tube forms an integral part of the Foundation pile, then in the casing add a further quantity of the bulk material, which is tamped with a hammer while removing the casing, thus forming a broadening of the pile heel, and before installing the frame casing pipe rebuff in the finished heel piles and completely knock out the remainder of the tube, install the reinforcement cage in the casing with the force of his depth in carrying solid ground and produce concreting just body piles by continuous laying of cast concrete with simultaneous lifting of the casing.

According to variants of the complete method:

mass of the hammer is determined by the formula G=78,5L d2π/4 (kN), where d is the diameter of the hammer (m), L is the length of the hammer (m);

- the height of the tube equal to three diameters of the casing;

- use a free-falling hammer copra;

- use the force of the falling hammer diesel hammer;

- when driving in communication soils carry out a preliminary drilling leading wells to be installed in her part of the casing and near existing structures constructed ramming piles in the direction of tsarevna structures;

- the distance between piles shall be from 6D to 10D, where D is the pile diameter;

- reinforcement cage piles, working on stretching, deepened in carrying solid ground not less than 3.0 m and piles, working in compression is not less than 1.0 m;

- bulk material tube can be made of dry concrete;

- bulk material tube can be made of gravel;

in soft soils carry out a preliminary soil compaction gravel at 1.0 m below the bottom of the pile;

- removing the casing when the concreting of the body piles produce at the rate of 9 to 11 m/min;

- when used as a bulk material gravel casing pipe hammered into the ground at a depth level from 1.0 to 2.0 m below the design elevation of the bottom of the pile;

when ramming an additional quantity of bulk material tube perform simultaneous extraction of the casing to a height of from 0.5 to 0.8 m;

- before installation of the reinforcement cage the casing rebuff in the finished heel to a depth of from 20 to 50 cm

The invention is illustrated by drawings, where:

- 1 shows the process of forming the tube in the casing pipe;

- figure 2 shows the process of diving into the ground casing;

- figure 3 shows the formation of a broadening of the pile heel;

- 4 shows the stage of installation of the reinforcing cage, and concreting the body piles cast concrete;

- IG shows the finished pile.

Before starting work, the casing 1 is suspended on the guide arm copra 2 and rest it on the ground. The mass of the hammer 3 copra 2 is determined by the formula G=78,5L d2π/4 (kN), where d is the diameter of the hammer (m), L is the length of the hammer (m). In the casing 1 sleep granular material, for example of dry concrete or gravel, and produce his seal by trebovaniya 10-20 hammer blows 3 from a height of 1.0-3.0 m, thus forming tube 4. Recommended height of the tube must be equal to three diameters of the casing. The casing 1 is dipped in the soil to the design elevation due to the attack of free-falling hammer 3 with a minimum height of 6-7 m in the tube 4. You can use diesel hammer for pile shell 1. When the immersion shell 1 is the displacement of the soil and its seal. Then produce the ejection of the tube 4 with the help of hammer blows 3 more up until it will not come into motion. With every blow of the hammer 3, pushing the tube 4, remove the casing to a height of 2 to 3 mm. After ejection tube 4 to a depth equal to half the diameter of the casing, stop removing the casing and its newly score of at least 20 blows of the hammer 3. After that, pull the plug 4, leaving her safe residue, preventing the ingress of water into the casing 1. The extruded material of the tube 4 forms an integral hour is ü the Foundation piles. Then in the casing 1 add a further quantity of the bulk material, which is tamped with a hammer 3 while removing the casing to a height of from 0.5 to 0.8 m, forming thereby broadening 5 of the abutment piles. The casing 1 rebuff in the finished heel piles to a depth of from 20 to 50 cm, fully knock secure the remainder of the tube 4 and is installed in the casing 1 of the reinforcing frame 6. The reinforcing frame 6 piles, working on stretching, bury bearing in firm soil to not less than 3.0 m and piles, working in compression, is not less than 1.0 m After that make concrete the whole body piles by continuous laying of cast concrete with a simultaneous raising of the casing 1 with a speed of 9 to 11 m/min

When used as a bulk material gravel casing pipe 1 hammer into the ground at a depth level from 1.0 to 2.0 m below the design elevation of the bottom of the pile. In soft soils carry out a preliminary soil compaction by trebovaniya gravel at 1.0 m below the bottom of the pile.

To prevent deflection of the vertical body ramming piles in cohesive soils carry out a preliminary drilling leading wells to be installed in her casing 1, and near existing structures ramming piles constructed in the direction from the middle of the structure. It is recommended to arrange printed the Vai on the distance between them from 6D to 10D, where D is the diameter ramming piles.

The proposed technology of construction ramming piles with the barrel of cast concrete allows you to:

- to increase profitability by reducing labor and materialsfrom;

to ensure high reliability of the execution of the protective layer of the required size;

- to build a heel broadening strictly programmed volume;

to increase the carrying capacity ramming piles by strengthening weak soils by pre-trebovaniya gravel.

Sources of information

1. WWW.Prosvai.ru, "Ramming piles Franks".

1. The method of manufacture of piles, which consists in suspending the casing to copra, resting it on the ground, filling the lower part of the casing of bulk material and the seal of the falling hammer copra to education in the casing tube, after which the casing is immersed to a predetermined level by applying hammer blows on the tube, and then by dropping the hammer with a greater height produce knockout tube with simultaneous formation of the broadening of the heel under the casing pipe, the installation of the reinforcing cage, and concreting of the pile shaft with simultaneous extraction of the casing, characterized in that after reaching the casing pipe design elevation shall popping cork by using a higher hammer blows until then, until it is p which goes in motion, with each stroke, pushing the tube, remove the casing to a height of 2 to 3 cm, and after the ejection tube to a depth equal to half the diameter of the casing, stop removing the casing and its newly hammer into the ground at least 20 blows of the hammer, then plug knock out, leaving her safe residue, and the material of the tube forms an integral part of the Foundation pile, then in the casing add a further quantity of the bulk material, which is tamped with a hammer while removing the casing, thus forming a broadening of the pile heel, and before installing reinforcing cage the casing rebuff in the finished heel piles and completely knock out the remainder of the tube, install the reinforcement cage in the casing with the force of his depth in carrying solid ground and produce concreting the entire body piles by continuous laying of cast concrete with simultaneous lifting of the casing.

2. The method of manufacture of piles according to claim 1, characterized in that the mass of the hammer is determined by the formula G=78,5L d2π/4 (kN), where d is the diameter of the hammer (m), L is the length of the hammer (m).

3. The method of manufacture of piles according to claim 1, characterized in that the height of the tube is equal to three times the diameter of the casing pipe.

4. The method of manufacture of piles according to claim 1, otlichalis the same time, they use free-falling hammer copra.

5. The method of manufacture of piles according to claim 1, characterized in that use hammer diesel hammer.

6. The method of manufacture of piles according to claim 1, characterized in that when driving in communication soils carry out a preliminary drilling leading wells to be installed in her part of the casing and near existing structures constructed ramming piles in the direction from the middle of the structure.

7. The method of manufacture of piles according to claim 1, characterized in that the distance between piles shall be from 6D to 10D, where D is the pile diameter.

8. The method of manufacture of piles according to claim 1, characterized in that the reinforcing cage piles, working on stretching, bury bearing in firm soil to not less than 3.0 m and piles, working in compression is not less than 1,0 m

9. The method of manufacture of piles according to claim 1, characterized in that the bulk material tube can be made of dry concrete.

10. The method of manufacture of piles according to claim 1, characterized in that the bulk material tube can be made of gravel.

11. The method of manufacture of piles according to claim 1, characterized in that in weak soils carry out a preliminary soil compaction gravel at 1.0 m below the bottom of the pile.

12. The method of manufacture of piles according to claim 1, wherein removing the casing is the pipe in the concrete body piles produce at the rate of 9 to 11 m/min

13. The method of manufacture of piles according to claim 1, characterized in that when used as a bulk material gravel casing pipe hammered into the ground at a depth level from 1.0 to 2.0 m below the design elevation of the bottom of the pile.

14. The method of manufacture of piles according to claim 1, characterized in that the compaction of additional quantity of the bulk material tube during the formation of the broadening of the pile heel carry out the simultaneous extraction of the casing to a height of from 0.5 to 0.8 m

15. The method of manufacture of piles according to claim 1, characterized in that prior to installation of the reinforcement cage the casing rebuff in the finished heel to a depth of from 20 to 50 cm



 

Same patents:

FIELD: construction.

SUBSTANCE: plant for soil compaction comprises a hollow casing pipe and a narrowing cap, which includes tabs hingedly fixed on the hollow casing pipe. The narrowing cap is equipped with at least one tab rigidly fixed on the hollow casing pipe.

EFFECT: higher strength of a cap and its tabs, provision of compaction of soil having stronger interlayers.

7 cl, 3 dwg

Aseismic pile // 2459041

FIELD: construction.

SUBSTANCE: aseismic pile comprises a cylindrical fabricated structure made of reinforced concrete placed into a sand concrete hollow reinforced cylinder, on the bottom of which there is granite sand, with a layer of around one metre. The space between the reinforced cylindrical structure and the sand concrete reinforced cylinder is filled with sand for the height of the hollow cylinder.

EFFECT: invention provides for foundation reliability, reinforcement, preventing building damage in case of considerable earth oscillations under seismically dangerous conditions, lower material intensity.

1 dwg

FIELD: construction.

SUBSTANCE: invention relates to the field of construction and may be used to erect piled foundations in weak and heaving soilds. Application of the device is especially efficient to erect cast-in-place piles for light wooden, frame buildings, transmitting small loads to foundations and exposed to deformations from seasonal freezing of heaving soils. The device comprises a casing pipe, a core arranged in the form of a pipe, closed with plates at the upper and lower sides, besides, chains are attached to the lower plate. Chains are placed into a tight shell made of waste materials (plastic, cardboard, veneer, etc.). In the upper and lower plates there are holes, through which a reinforcement rod stretches, which also passes via a shell with chains. In the lower part of the shell the reinforcement rod is fixed with an orifice, and in the upper part - with a nut. Between the casing pipe and the well wall there is an anti-heaving material (bitumen mastic, organosilicon compounds, polymer films, sarking, sand and gravel mix).

EFFECT: device makes it possible to increase the bearing capacity of a pile and prevents exposure of building and structure foundations to soil heaving forces.

1 dwg

FIELD: construction.

SUBSTANCE: shell pipe is made of hollow metal or reinforced concrete cylinders joined by means of electric welding or bolt joints. In order to increase bearing capacity and improve process capabilities, there is a diaphragm installed into inner cavity of pile, providing for formation of compacted zone of soil under spike, controlling depth of its submersion and specified bearing capacity. Diaphragm is made in the form of truncated cone oriented towards pile head and with hole in its upper part.

EFFECT: increased bearing capacity, reduction in material consumption and labour costs.

2 dwg

FIELD: construction.

SUBSTANCE: invention is related to the field of construction, in particular to pile design. Reinforced concrete driven pile of circular section contains sharpened bottom end having shape of rotation paraboloid truncated in focal plane, lower to truncation plane, paraboloid changes into spherical belt, at the very end spherical belt transits into cone. Formula provides the second version of reinforced concrete driven pile making.

EFFECT: improved shape of pile tip, with the purpose of more complete usage of impact or vibration energy and reduction of time needed for pile submersion in ground.

2 cl, 1 dwg

FIELD: construction.

SUBSTANCE: invention is related to the field of construction, in particular, to technical facilities for erection of pile foundation erected from bored piles. Lost cap for erection of bored pile in the form of cone-shaped body is made of two parts, upper part of which represents truncated cone, and lower part is formed by bearing rod fixed in cantilever manner from the side of lower base along its symmetry axis with rippers in the form of radially installed plates.

EFFECT: reduction of head resistance and easier intrusion of guide tube in earth.

3 cl, 2 dwg

FIELD: building, particularly to erect foundation bases in permafrost ground.

SUBSTANCE: method for tubular pile driving in permafrost ground involves drilling hole; installing pile in the hole and leaving it as it is inside the hole up to thermal permafrost ground regime recovery. To install pile in the ground inventive insert having diameter smaller than hole diameter in lowered in hole along central hole axis. Space between the insert and hole wall is filled with loose ground. Then the pile having inner diameter practically equal to outer diameter of the insert and opened lower end is driven in the loose ground. After that the insert is removed from hole. Other variants of pile driving are also disclosed.

EFFECT: increased building and assembly job efficiency due to decreased time of pile freezing in permafrost ground and improved load-bearing capacity of piles.

11 cl, 8 ex, 4 dwg

FIELD: building, particularly foundation and retaining wall erection with the use of injection piles.

SUBSTANCE: injection pile comprises concrete shaft formed directly in well and comprising reinforcing cage made as metal injection pipe lowered in well to refusal and spaced from well wall. The injection pipe is provided with lower perforated section having side injection orifices arranged in several layers beginning from lower injection pipe end. Well diameter is not more than 3d, where d is outer injection pipe diameter. Perforated section length is more than 3d, but less than L and is equal to (0.2-0.7)L, where L is well depth. Retaining wall is built on pile foundation comprising injection piles. The retaining wall includes reinforcing cage made as metal pipe having upper part used as head. The retaining wall is composed of concrete blocks laid in several rows one upon another. Blocks of lower row form retaining wall base. At least upper block installed on lower one has through orifice, which is vertically aligned with mounting orifice formed in lower block. Common cavity defined by above orifices is reinforced and concreted.

EFFECT: simplified structure, reduced cost of pile foundation and retaining wall construction.

21 cl, 3 ex, 3 dwg

FIELD: building, particularly to create bored piles in cased wells during building and building structure foundation erection.

SUBSTANCE: method involves heating ground surrounding place of pile erection and heating concrete mix with induction heater. The concrete mix is vibratory treated in pulsed mode at the beginning of heating operation by applying electromagnetic field generated by induction heater to metal reinforcement bars, wherein high-frequency current of induction heater is subjected to low-frequency modulation. At concrete mix setting beginning the pulsed mode is changed into high-voltage one. Device for above method realization comprises induction heater comprising steel pipe put on asbestos-cement pile casing pipe and winding made of copper coiled bus linked with high-frequency power source. The winding is connected to metal pipe. Diametrical longitudinal orifices are made in the steel pipe. The power source comprises circuit providing high-frequency current modulation with low frequency.

EFFECT: possibility of simultaneous heat and vibration application to concrete mix, reduced cost of the device along with reduced number of working tools, simplified control, provision of concrete shrinkage and compaction under heating, which is performed by single device.

2 cl, 4 dwg

FIELD: building, particularly to erect cast-in-place pile having large diameter in collapsible ground layer of large thickness.

SUBSTANCE: method involves drilling pilot hole; installing casing pipe connected to puncher; punching the well ground by dropping load on the puncher through casing pipe to reach design point and enlarging the casing pipe; arranging reinforcement case in the pipe; filling the well with concrete mix as casing pipe moves upward; compacting the concrete mix. In the case of pile with 300-1500 mm diameter forming and in the case of collapsible ground layer thickness up to 18 m or 18-50 m ratio between pilot hole depth and collapsible ground thickness is 1:(4.5-6) and 1:(1.5-5). The puncher has reinforced concrete tip and head made of tube with outer diameter equal to inner diameter of pilot hole. Welded to the head are centering rings. The tip has ring to engage thereof with technological control rod provided with thread, washer with retainers and nut on opposite end thereof. Ratio of height H of upper head part provided with centering rings to length of casing pipe to be installed in the head is 1:(20-30). Ratio between outer puncher diameter D and outer diameter d at tapered part ℓ thereof is equal to 1:0.8. Length ratio between cylindrical head part L and cylindrical tapered part ℓ is equal to 1:0.6. Angles γ of head and head transition area leading to tapered part ℓ are equal to 30°. Difference between outer puncher diameter D to outer casing pipe T diameter is 90-100 mm.

EFFECT: reduced labor inputs and decreased material consumption.

2 dwg

FIELD: building structures, particularly shallow foundations.

SUBSTANCE: method involves creating well by ground excavation, introducing preparatory portion of hardening material in well hollow including calculated part of hardening material; arranging explosive charge in lower well part; securing explosive charge; blowing explosive charge up to create cavity for widened foundation post part; crushing and widening above calculated part after explosion; introducing additional portion of hardening concrete in well up to 4/5 of well height; filling it with calculated part of above material portion. Concrete for casting is used as preparatory hardening material.

EFFECT: reduced time, increased simplicity of foundation building and reliability.

2 cl, 5 dwg

FIELD: building and construction.

SUBSTANCE: method includes serial vibration immersion of inventory elements into soil, which are mated between each other, and their following vibration extraction with concurrent filling of hollow in soil with concrete mixture. Inventory elements are used, which are made in form of profiled posts, having gates in lower portion, closed during immersion in soil and opened by flexible links during extraction of elements from soil and feeding of concrete mixture. At the same time profiled elements of longitudinal walling have lesser length, than length of profiled elements of vertical posts, which during immersion are pressed in for greater depth than profiled elements of longitudinal walling. First, profiled element of longitudinal walling is immersed, and then via guiding conductor profiled element of vertical post is densely mated to it and is than immersed. Concrete mixture is loaded in profiled element of longitudinal walling with its extraction with open gates and extracted element is immersed in next position adjacently to previous profiled element of vertical post being in soil. Concrete mixture is loaded into profiled element of vertical post during its extraction with open gates and extracted element if immersed into following position with concurrent mating to previous profiled element of longitudinal walling with use of guiding conductor. Then inventory elements are immersed again. Device for construction of bearing-limiting structures in soil includes crane or pile driver with vertical guide, vibration immersion driver and at least two inventory hollow elements. Inventory elements are made in form of profiled elements of longitudinal walling and profiled elements of vertical posts. Profiled elements of longitudinal walling have length less than length of profiled elements of vertical posts, which are made of hollow rectangular profiles, rigidly interconnected by solid rib along transverse axis along whole height of element, while vertical guide in lower portion is provided with guiding conductor.

EFFECT: higher efficiency, broader functional capabilities.

2 cl, 13 dwg

FIELD: building, particularly cast-in-place building units, namely support structures.

SUBSTANCE: reinforced concrete column is formed in retained formwork and consists of upper support part and lower foundation part. Column includes reinforcement frame grouted with concrete mix and embedded members arranged in upper column part. Upper part of frame is located in retained formwork. Embedded members are in level with foundation slab marks and with flooring panel marks. Embedded members are formed as closed contours with stiffening ribs. Column is built in single- or multi-slot hollow. Projection of geometric retained formwork cross-section center coincides with that of lower reinforcement frame part. Arms of lower reinforcement form part extending in Y-axis direction are sized in accordance with given mathematical relation. Method of column erection involves forming single- or multi-slot hollow; producing reinforcement form with embedded members; forming retained formwork; installing above components; vertically placing the reinforcement frame in hollow so that frame is spaced a distance from hollow bottom; vertically adjusting and fixing upper column part to prevent transversal displacement thereof; grouting lower column part in bottom-top direction; grouting inner retained formwork area of upper column part. Hollow has dimensions measured in Y-axis direction determined from given relation.

EFFECT: possibility of simultaneous building erection in upward and downward directions relative ground level.

7 cl, 13 dwg

FIELD: building, particularly for erecting support structures, namely pile foundations, injection anchors, walls in ground, cast-in-place reinforced earth constructions and other geotechnic structures used for new building erection or reconstruction of existent buildings.

SUBSTANCE: method involves forming well or trench section in ground; at least partly filling thereof with hardening material or drilling agent, for instance with cement-bentonite one; substituting thereof with hardening material; immersing reinforcing cage with outer flexible shell connected to at least part of cage length in well. The flexible shell is permeable for liquid fraction of the hardening material and provides waterproofing of the cage after setting of above material and hardening material located outside the shell. Shell parameters are determined from the given correlations.

EFFECT: increased load-bearing capacity, reliability and service life, extended field of application.

24 cl, 9 dwg

FIELD: building, particularly foundation building, namely for erecting pile foundations in seasonally freezing ground.

SUBSTANCE: method involves forming well extending for the full thickness of seasonally freezing ground layer, wherein well diameter increases pile diameter; installing heater in the well; transferring heat; driving casing pipe with detachable tip in ground through heater cavity; concreting well bore along with simultaneous lifting casing pipe and removing heater. Heat is supplied to concrete mixture within the limits of seasonally freezing ground after casing pipe removal. Inductor made as copper wire coil covered with heat-protective layer and located outside metal pipe is used as the heater. Heating is performed within 10-12 hours along with maintaining 75-80°C temperature of concrete mix by regulating inductor power up to obtaining concrete strength equal to 80% of design strength. After inductor removal from the well gap formed between well wall and pile body is filled with non-heaving ground.

EFFECT: reduced power inputs along with maintaining high productivity and increased load-bearing pile capacity.

2 cl, 3 dwg

FIELD: building, particularly pile foundation erection.

SUBSTANCE: method involves drilling hole; installing injection pipe in the hole bottom center; installing reinforcement case; injecting cement-and-sand grout through the injection pipe below lower pile end for ground compaction and widened part arrangement; concreting the pile. To create widened part of the pile and to compact ground after concrete hardening cement-and-sand grout is fed under pressure into sealed bag formed of elastic water impermeable material and connected to lower end of ejection pipe so that cement-and-sand grout expands the bag up to reaching necessary bag volume.

EFFECT: increased economy of pile forming, increased ability of clay ground compaction at pile base.

4 dwg, 1 ex

Pile // 2263746

FIELD: foundation building.

SUBSTANCE: pile has body made as shell filled with concrete and formed as members having trough-shaped cross-sections and extending in longitudinal direction. Members have side walls abutting the central wall and extending at obtuse angles from it. The shell has frame. Central walls of frame members are of ellipsoid shape and filled with concrete.

EFFECT: increased load-bearing capacity and reliability.

5 dwg

FIELD: building, particularly to erect cast-in-place pile having large diameter in collapsible ground layer of large thickness.

SUBSTANCE: method involves drilling pilot hole; installing casing pipe connected to puncher; punching the well ground by dropping load on the puncher through casing pipe to reach design point and enlarging the casing pipe; arranging reinforcement case in the pipe; filling the well with concrete mix as casing pipe moves upward; compacting the concrete mix. In the case of pile with 300-1500 mm diameter forming and in the case of collapsible ground layer thickness up to 18 m or 18-50 m ratio between pilot hole depth and collapsible ground thickness is 1:(4.5-6) and 1:(1.5-5). The puncher has reinforced concrete tip and head made of tube with outer diameter equal to inner diameter of pilot hole. Welded to the head are centering rings. The tip has ring to engage thereof with technological control rod provided with thread, washer with retainers and nut on opposite end thereof. Ratio of height H of upper head part provided with centering rings to length of casing pipe to be installed in the head is 1:(20-30). Ratio between outer puncher diameter D and outer diameter d at tapered part ℓ thereof is equal to 1:0.8. Length ratio between cylindrical head part L and cylindrical tapered part ℓ is equal to 1:0.6. Angles γ of head and head transition area leading to tapered part ℓ are equal to 30°. Difference between outer puncher diameter D to outer casing pipe T diameter is 90-100 mm.

EFFECT: reduced labor inputs and decreased material consumption.

2 dwg

FIELD: building, particularly to create bored piles in cased wells during building and building structure foundation erection.

SUBSTANCE: method involves heating ground surrounding place of pile erection and heating concrete mix with induction heater. The concrete mix is vibratory treated in pulsed mode at the beginning of heating operation by applying electromagnetic field generated by induction heater to metal reinforcement bars, wherein high-frequency current of induction heater is subjected to low-frequency modulation. At concrete mix setting beginning the pulsed mode is changed into high-voltage one. Device for above method realization comprises induction heater comprising steel pipe put on asbestos-cement pile casing pipe and winding made of copper coiled bus linked with high-frequency power source. The winding is connected to metal pipe. Diametrical longitudinal orifices are made in the steel pipe. The power source comprises circuit providing high-frequency current modulation with low frequency.

EFFECT: possibility of simultaneous heat and vibration application to concrete mix, reduced cost of the device along with reduced number of working tools, simplified control, provision of concrete shrinkage and compaction under heating, which is performed by single device.

2 cl, 4 dwg

FIELD: building, particularly foundation and retaining wall erection with the use of injection piles.

SUBSTANCE: injection pile comprises concrete shaft formed directly in well and comprising reinforcing cage made as metal injection pipe lowered in well to refusal and spaced from well wall. The injection pipe is provided with lower perforated section having side injection orifices arranged in several layers beginning from lower injection pipe end. Well diameter is not more than 3d, where d is outer injection pipe diameter. Perforated section length is more than 3d, but less than L and is equal to (0.2-0.7)L, where L is well depth. Retaining wall is built on pile foundation comprising injection piles. The retaining wall includes reinforcing cage made as metal pipe having upper part used as head. The retaining wall is composed of concrete blocks laid in several rows one upon another. Blocks of lower row form retaining wall base. At least upper block installed on lower one has through orifice, which is vertically aligned with mounting orifice formed in lower block. Common cavity defined by above orifices is reinforced and concreted.

EFFECT: simplified structure, reduced cost of pile foundation and retaining wall construction.

21 cl, 3 ex, 3 dwg

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