Shell pile with specified bearing capacity

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

 

The technical field (use): in the field of construction, in particular in the construction of bridges, bridges, port hydraulic, fencing and protection constructions pile type and pile design for ice-resistant structures offshore oil fields.

The prior art (analogues and prototype):

Known reinforced concrete pile shell /1/consisting of several sections 6-8 meters in length, connected as dive with bolted joints.

Also known metal pile shell /2/, consisting of several sections up to 12 m connected as dive with welded joints.

However, the aforementioned pile shell when immersed can't form a reinforced zone of the soil under the edge, losing, depending on soil conditions, up to 60-80% load capacity.

The essence of the invention.

Pile-shell with the specified bearing capacity contains in the internal cavity of the diaphragm in the form of a truncated cone mounted on the estimated length, measured from the edge of the pile. Aperture should be oriented cone in the direction of the head of the pile, and the truncated part of the cone should be open to free exit when diving air or water.

The length of the piles from the apex to the diaphragm depends on the initial density of the soil and itive increase in soil density, located in the cavity in the process of pile-shell design mark.

The technical result.

A significant increase in bearing capacity due to the formation of the condensed zone soil at the edge of the pile shell and the account of the resistance on the ground by the sectional area of gross.

Closest to the invention to the technical essence and the achieved result is a pile-shell comprising a hollow fabricated from metal or concrete barrel sections.

The disadvantage of piles of shells is in the absence of the edge of the compacted zone of soil and load bearing capacity of the edge is significantly reduced because the rated resistance of the ground is taken into account only by the sectional area of net /2/.

The challenge which seeks a technical solution is a significant increase in the bearing capacity of the pile shell through the device in the cavity of the diaphragm.

The technical result, which is achieved by solving the problem, is that when submerged pile-shell ground between the diaphragm and the tip begins to thicken. The increase in soil density inside the cavity will cause the formation of densified zones of the soil at its tip that was not in the pile-shell without the diaphragm.

Comparative analysis of the essential features offer the technical decisions with significant signs and analog prototype demonstrates its compliance with the criterion of "novelty".

This distinctive features in the claims solves the following functional tasks.

The sign "... inside the cavity is arranged aperture ... allows the soil placed in the inner cavity of the pile shell to change its structure. When submerged pile shell, the soil is compressed between the diaphragm and the edge, thereby automatically creates the dirt tube inside the shell, and then reinforced zone of the soil at the level of the tip".

Constructive execution.

Figure 1 shows the technical solution of the pile shell. Pile-shell consists of two sections (1, 2), in the connections pane which has a diaphragm (3).

The pile shell.

Pile-shell works with the surrounding soil Foundation as follows.

Pile-shell, figure 2, provided with a diaphragm (3), when immersed passes freely through the water column (9). Air tube between the diaphragm and the water surface is not formed due to the open top of the truncated cone of the diaphragm. When this pile-shell works with the Foundation soil (10) only the inner and outer side surfaces and square edges (net).

With further immersion of the pile shell, figure 1, all the water located between the diaphragm and the surface of the soil, flowing freely through the hole in the upper part of the truncated cone until Catanese surface area of the diaphragm with the Foundation soil.

In the process of further pile-shell ground below the bottom surface of the diaphragm will begin to thicken, forming the inside of the shell dense core (4), from the surface on which the sliding planes (6) soil mass will harden, thereby forming a dirt tube and dense core (5) at the edge of the pile shell. With further immersion of the soil piles located in the region of the tip begins to move along the slip planes (7), thus forming a volumetric compaction zone soil (8). With the formation of the condensed zone soil at the edge of the further sinking of the pile shell will become impossible due to the rapid increase of the resistance of the compacted soil on the edge.

In this case, the bearing capacity of the pile shell, figure 1, will consist of two components - bearing capacity at the tip with a cross-sectional area (gross) and on the lateral surface. This ensures increased by 40-60%, load-carrying capacity.

Savings of material and labor will be at least 50%.

1. Piles in hydraulic engineering. Vgidetavasti, Snivel, Swill, Yemalenikov, tutorial. - M, Publisher DIA, p.18 (prototype).

2. Guidance on the design of pile foundations. Nyiop them. Nemertinea. Gosstroy of the USSR, Moscow, stroiizdat, 1980, s.

Pile-shell hollow metal or isobutane cylinders, assembled by means of welding or bolting, characterized in that to increase the bearing capacity and improve technological capabilities in the internal cavity of piles installed aperture capable of forming a densified zone of the soil under the edge of regulating the depth of immersion and the desired load-carrying capacity, and the diaphragm is made in the form of a truncated cone, oriented in the direction of the head of the pile and with a hole in its upper part.



 

Same patents:

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

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 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

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 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 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

Up!