Method to produce wells in soil for erection of filling pile and device for its realisation

FIELD: construction.

SUBSTANCE: method to produce wells in soil for erection of filling piles includes simultaneous submersion of a stamp and a casing pipe by hammering to a design elevation, withdrawal of the stamp and the casing pipe, previously a set of a working element is submerged into soil, including a casing pipe with a head, a stamp with a body arranged coaxially to the casing pipe, with a striker and a tip, at the same time the stamp with the body, the striker and the tip is used as a rammer protruding from the casing pipe.

EFFECT: higher extent of soil compaction and bearing capacity of foundations on filling piles in unstable, loose and waterlogged soils.

2 cl, 5 dwg

 

The invention relates to the construction industry, in particular to the technology of construction of pile Foundation in wyrmbane wells in unstable, saturated or loose soils, and can be used in the preparation of bases and foundations in industrial, civil and residential construction.

A known method of forming wells in the ground under a pile foundations on compacted base, which consists in driving the hammer casing with drop-down tip, filling the inner cavity of the hard construction material, ramming the boy inside the casing pipe construction material preemptive him during the opening tip, and gradually removing the casing pipe hoist machine base, additional ramming flat tamping the surface of the piles (see, for example, Abramenkov E.A., Georgians CENTURIES mechanization training grounds and foundations. - Novosibirsk: NGas, 1999, p.41).

The disadvantage of this method is that the formation of wells with piling hammer casing and additional compaction is not possible to get the base for foundations with sufficient bearing capacity, which leads to the formation of the bushes from such wells and, consequently, to a significant consumption of building materials

A known method of forming wells in the ground on aggregated basis, which is the simultaneous immersion of the stamp and the casing, removing the stamp winch machine base of the casing, the installation of the reinforcing cage, and concreting well with simultaneous extraction of the casing extraction device (see, for example, Abramenkov E.A., Georgians CENTURIES mechanization training grounds and foundations. - Novosibirsk: NGas, 1999, p.44 - prototype). Way as having the largest number of matching essential features of the proposed invention is adopted as a prototype.

The disadvantage of the prototype is that the method of forming wells with piling casing and a working body, immersing the equipment does not allow to get the foundations with sufficient bearing capacity, because it does not form an extended base, which leads to the formation of the bushes from such wells and, consequently, to a significant consumption of construction materials.

A device hinged on the excavator or Koper, which includes the basic machine with retaining boom, mast and tip, retrieves the device management system attachments, the casing with the tip located coaxially of the casing pipe stamped with housing, boik the m and tip (see, for example, Abramenkov E.A., Georgians CENTURIES mechanization training grounds and foundations. - Novosibirsk: NGas, 1999, p.73-74 - prototype).

The disadvantage of this device is that it does not allow you to use the stamp of the working body as a sealing percussion device, which reduces the load bearing capacity of the substructure under the pile.

The disadvantages of the prototype can be avoided if to carry out the method of formation of wells and the use of the device in the following sequence:

1) simultaneously immerse the hammer blows stamp and the casing to the design elevation;

2) remove the stamp and the casing, pre-soaking into the ground set of the working body;

3) under the action of gravitational forces stamp to strike the casing pipe with simultaneous trebovaniyam hard building material in the wall of the well formed by immersing it to the design elevation;

4) to raise the stamp, fill hard material (gravel, clay, etc. in the bottom of the pit and utrambovyvat it in the base of the trench;

5) install the armature frame, concrete and at the same time (as concrete) gradually remove the casing extraction device.

In the method of forming wells in the ground for the construction of piles, including simultaneous immersion blows mo the OTA stamp and casing to the design elevation, removing the stamp and casing, pre-exercise dip in the ground set of the working body, then under the action of gravitational forces stamp strike at the casing pipe with simultaneous trebovaniyam hard building material in the wall of the well formed by immersing it to the design elevation.

The device includes the basic machine with retaining boom, mast and tip, retrieves the device management system attachments, the casing with the tip located coaxially of the casing pipe seal with the housing, the striker and tip, and stamped with the housing, the striker and tip are used as thrombolites, jutting out from the casing by an amount equal to:

,

where Nin- the height of the tip of the punch, m;

Robtrthe inner radius of the casing when immersing it in the ground mass, m;

φ is the angle of internal friction of the soil;

ρ0, ρmaxrespectively the density of the soil to compaction and maximum density of soil medium, N/m3,

and having a side surface forming with the longitudinal axis forming an angle taken from the condition:

,

where α is the angle of taper of the tip of the stamp, hail.

The performance of the proposed methods is a and the device illustrated by the drawings, where presented: figure 1 - the method of construction of pile foundations on compacted base, figure 2 - mounting equipment for wyrmbane pits (General view), figure 3 - set of the working body, figs.4 - stamp, figure 5 - casing pipe.

The method of forming wells in the ground for the construction of piles on the compacted base is (see figure 1): pre-dive kit working body, including the casing (see pos.7) and the stamp (see pos.6), subsequent immersion of the stamp casing and simultaneously wypracowanie from its Foundation ground lug to the design elevation (see Pasa-b), then produce a rise in stamp (see posv). Next is filling hard building material in the casing, its utrambovyvaya in the base of the pit (see posh) stamp, which is then removed from the casing and place it in the transport position (see post). The excavation with compacted base is ready for pile foundations (see pose). Next, produce a lowering of reinforcement cage (see pose), pouring concrete into the casing with simultaneous extraction by means of a cylinder casing and seal the concrete mass at the disposal of the soil (see pose). After all these operations get ready pile Foundation (see poz.z).

Device is istwo includes (see 2) basic machine 1 with the retaining shaft 2, mast 3 and cap 4, pick-discharging mechanism 5, the stamp 6, the casing 7, the release mechanism of the casing 8, the guidance mechanism 9, the mechanism for lifting / lowering of the mast 10. The kit of the working body (see figure 3) includes stamp 6 and casing pipe 7 connected with a bracket 11. Stamp 6 (see figure 4) consists of a body 12, the tip 13 and the striker 14 with holes 15 for mounting with casing pipe 7. Casing pipe 7 (see figure 5) consists of a body 16 and the anvil 17, in which the holes 18 for mounting to the stamp 6.

Device for the formation of the wells is as follows. Down on the ground and set vertically mast 3 by means of the machine base 1, a retaining arrows 2 and guidance mechanism 9. Stamp 6 and the casing 7, connected by a bracket 11, a gripping-discharging mechanism 5 along the guide rails of the mast by means of a hoist main hoist (not shown) is moved to the original drop height. After a trip to pick-discharging mechanism 5 set the working body under the action of gravity falls and embedded in the soil environment. Disconnect the bracket 11 between the die 6 and the casing pipe 7 and carry out flushing of the stamp 6. Stamp 6 under the action of gravitational forces strikes the striker 14 and the anvil 17 is bidney pipe 7, through its immersion, and at the same time on the ground, displacing it radially in the side of the casing. Immersion of the casing 7 to carry out the design of the label, after removing the stamp 6 in the bottom of the wells fall asleep hard building material and produce it additional utrambovyvaya stamp 6 in the base of the well to increase the bearing capacity of the substructure under the pile. Stamp again removed from the casing, lowering reinforcement cage and pour the concrete mixture with subsequent sealing and simultaneous gradual extraction of the casing 7 of the formed hole. The equipment is transferred to the transport position, the base machine is moved to a new place of wyrmbane well, next work cycle continues in the same sequence.

The execution sequence in the method of construction of pile foundations on compacted base in sealed wells proposed device allows to avoid the destruction of the walls unstable, loose and saturated soils and to make better the well, increasing the load bearing capacity of the soil pile Foundation.

1. The method of forming wells in the ground for the construction of piles, including simultaneous immersion of the hammer blows stamp and casing to project noted the key, removing the stamp and the casing, wherein the pre-exercise dip in the ground set of the working body, including the casing with the tip, located centrally in the casing pipe seal with the housing, the striker and tip, with the stamp housing, striker and tip are used as thrombolites, jutting out from the casing.

2. The device, which includes the basic machine with retaining boom, mast and tip, retrieves the device management system attachments, the casing with the tip, located centrally in the casing pipe seal with the housing, the striker and tip, characterized in that the stamp housing, striker and tip are used as thrombolites, jutting out from the casing by an amount equal to:

where Nin- the height of the tip of the punch, m;
Robtrthe inner radius of the casing when immersing it in the ground mass, m;
φ is the angle of internal friction of the soil;
ρ0, ρmaxrespectively the density of the soil to compaction and maximum density of soil medium, N/m3,
and having a side surface forming with the longitudinal axis forming an angle taken from the condition:

where α is the angle of taper of the NAC is neonica stamp grad.



 

Same patents:

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

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 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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