Injection pile and retaining wall built of pile foundation

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

 

The invention relates to the field of construction, namely the construction of the foundations with the use of CFA piles. The invention also relates to a retaining wall constructed with the use of piles.

In the prior art there are known various constructions of the piles and their construction methods. Typically, these piles erected as follows: form a hole in the ground, set it reinforcing cage, injecting pipe concreted pile shaft [as. SU 1052625, publ. 07.11.1983]. While there are ways in which injecting pipe, usually perforated, after injection of cement-sand mortar extracted from wells [patent US 4009582, publ. 01.03.1977] or left in the well as reinforcing cage ["Guidelines for application of the piles): neisp, 1984, p.8-15, 3.3]. Well-known structures and methods require additional work for different loading conditions and soils.

As the first prototype of the proposed technical solutions selected brown-injection pile with reinforced bottom manufactured by the method, in particular including the drilling of wells, installation of the reinforcement cage in the form of a pipe-injector, injectiona cement-sand mortar to spout clean solution from the wellhead, pressure test the well [patent RU 2188904, publ. 10.09.2002]. Trubaindo with injection holes and broadened the pointed tip is dipped into the borehole bottom to project failure, the diameter of the pipe-injector perform two to three times smaller than the diameter of the hole, pointed tip fulfill diameter 0,8-0,9d and a height of 4-5d, where d is the diameter of the hole, and the injection holes are filled with a diameter of 0.08 to 0,12d and have them in a checkerboard pattern at a distance of 0.5-1d from the lower end of the pipe-injector.

The prior art various designs and methods of construction of retaining walls on pile foundations.

Known retaining wall, including the Foundation of bored piles, combined grillage [as. SU 1811548, publ. 23.04.1993]. Another such technical solution is the Foundation piles are made on the spot by drilling, lowering them rebar cages with subsequent concreting [patent RU 2211287, publ. 27.08.2003]. The construction of such retaining walls is time consuming, because in the first case requires the excavation of a large volume of soil, and the second because of the complexity of the design of the retaining wall.

Known retaining wall containing prismatic wall panel mounted on the pile heads, buried in sustainable soil below the level of weak soils [application JP 2003-119805, publ. 23.04.2003]. This design can be used successfully only for walls of low height and requires excavation of a large volume of soil.

There is a method built what I retaining walls, according to which: drilling the number of wells with a certain interval, fill the hole with mortar, is inserted in bore steel piles, set the horizontal beam at the pile heads, carry out the recess of the first tier of the ground and mount the first tier of the retaining plates between adjacent piles, then mounted intermediate horizontal beam, perform the recess of the second tier of the ground and mount the second tier of the retaining plates between adjacent piles, etc. according to the number of tiers [patent CN 1204714, publ. 13.01.1999]. The known method is highly specialized and requires excavation of a large volume of soil.

Known retaining wall comprising a panel L-shaped, i.e. the front and base plate rigidly connected with the formation of the angular profile. This panel can be installed on a number of vertical piles under the Foundation slab [as. SU 1330269, publ. 15.08.1987], a series of inclined piles passing through the base plate [application JP 60-112931, publ. 19.06.1985], or in the ranks of both vertical and inclined piles [application JP 60-112932, publ. 19.06.1985]. Known methods of construction of retaining walls with L-shaped panels, which is common for that base plate is mounted on the piles, the pile heads through holes in the base plates and connect them with a solution, h is particular with the use of vertical and horizontal reinforcement bars [application JP 02-080718, publ. 20.03.1990; application JP 07-197478, publ. 01.08.1995]. The lack of walls with L-shaped panel is the need for excavation of a relatively large volume of soil beneath the horizontal base plate of the panel.

Retaining wall constructed in a manner similar to the above, is selected as the second prototype of the proposed technical solutions [application JP 09-209377, publ. 12.08.1997]. Used L-shaped panel has a hole for the piles in the Foundation plate. After installation of the piles L-shaped panel is installed so that the pile top was inserted in the specified slot. Then into this hole from the top to pour the concrete to consolidate the pile with the panel. In addition to the above-mentioned disadvantage of this design is unstable to roll over, and the bonding strength of the pile top panel is relatively low.

Solved the technical problem is to simplify the design of the piles, reducing the cost of construction of foundations on CFA piles, in particular the construction of retaining walls on pile foundations.

Proposed CFA pile containing concrete barrel made directly in the well containing the reinforcing cage in the form of a metal pipe-injector, which is immersed in the hole with a gap to the design of the waiver and provided on the lower part of the perforated phase is m with lateral injection holes, spaced tiers from the lower end of the pipe-injector, while the diameter of the hole is not more than 3d, where d is the outer diameter of the pipe-injector. What's new is that the length of the perforated section is more 3d and does not exceed L, where L is the depth of the well, and the length of the perforated section is (0,2-0,7)L. Thus, the use of a single pipe with a constant cross-section as a reinforcing frame simplifies the design of the pile - for example, compared with the prototype [patent RU 2188904, publ. 10.09.2002], in which the pipe has extended a pointed tip and provided with a cuff, or with another known technical solution [patent RU 2103443, publ. 27.01.1998], in which the pipe piles contains flange, being submerged in the well.

Best when: borehole diameter is (1,05-2,00)d; the well depth is (20-30)d; the ratio of the inner diameter of the pipe-injector to its external diameter is equal to 0.80-0.95; the diameter of the injection holes is (0,25-0,40)d. These geometrical relations effectively injectivity cement-sand mortar under pressure of 0.2-0.4 MPa in the manufacture of piles, the lower part of which is in a stable soil average strength (ultimate strength in uniaxial compression of more than 25 MPa).

In one tier may be performed two or more holes with an equal pitch around the circumference of the cross of the Oia.

Each tier can be performed on two holes, and the axis of the holes adjacent tiers in this case it is better to perform the perpendicular.

The distance between the tiers can be (0,5-3,0)d, and may be equal, i.e., the layers can be performed with equal step.

The upper part of the pipe-injector located above the well, can be embedded in reinforced concrete grillage.

On the top face of the grillage may be a metal plate, and the grillage can be provided with anchor bolts that attached the bottom part to the upper part of the tube of the injector and passed through holes in a metal plate.

Effective use of relatively simple construction of the proposed piles has been successfully tested for the case of penetration of piles in sustainable soil below the level of weak soils.

Also proposed retaining wall on a pile Foundation, pile which used the claimed CFA piles containing reinforcing cage in the form of a metal pipe, the upper part of which is used as a tip. A retaining wall made of concrete blocks fixedly mounted in tiers one on top of another, as the basis of a used lower unit, and at least the upper block mounted on the lower block has a through hole, I had lausiaca adjacent vertically with the mounting hole in the lower block. The total cavity formed by the mentioned holes, reinforced and concreted.

The total cavity may be reinforced with a reinforcing rod or frame of the reinforcing wire.

The total cavity can be reinforced through the upper part of the metal pipe passing through the installation hole and a member of the through hole of the upper block.

The total cavity may be formed mounting hole and the through holes of two or more consecutive blocks mounted on the lower block.

On the top block with a through hole can be mounted to a solid concrete block or blocks.

Piles can be arranged in two rows, with the pile top of the second row is also inserted with clearance through the installation hole in the lower block and concreted in it.

The thickness of the lower block or blocks is better to perform greater than a thickness of more than the top of the block or blocks.

A retaining wall can be made of two or more adjacent vertical rows, each of which is made of concrete blocks fixedly mounted in tiers one on top of another. The height of vertical rows may decrease from row to row.

As CFA piles can be used above the proposed pile.

The invention is illustrated by drawings. Figure 1 shows buroinektsionnye the pile with pile Foundation. Figure 2 and 3 show two different exemplary embodiment of retaining walls on pile foundations.

The invention is illustrated by examples.

Example 1. Pile Foundation support provider.

The Foundation supports planted in the area with the following geological conditions: the top layer up to 1 m detritus soil with loamy aggregate up to 20%, a density of 2.10 g/cm3the estimated resistance Rc=0,45 MPa; below the top layer porphyry tuff highly fractured medium strength, density of 2.33 g/cm3ultimate strength in compression Rwith=44/35 MPa. The Foundation has four CFA piles are located at the corners of a square with side 3 m Each pile (see figure 1) is manufactured in a pre-drilled hole 1 a depth of 3 m and a diameter of 125 mm, in which the Central axis until it stops inserting pipe 2 3.3 m long welded to the upper part of the anchor bolts 3. Tube 2 has an outer diameter of 114 mm and a wall thickness of 4.5 mm, and its lower part on a length of 1 m perforated holes 4, 35 mm in diameter, arranged in staggered tiers in increments of 200 mm In the well 1 through the pipe 2 under pressure of 0.2-0.4 MPa injection cement-sand mortar 5 to spout clean solution from the wellhead 1, pressed the borehole 1. Pile heads in the form of the upper end of the pipe 2 are buried in the concrete grillage 6, reinforced what rmatory 7. Anchor bolts 3 pass through holes in a metal plate 8.

Example 2. Retaining wall height of 7-12 m (see figure 2).

Retaining wall rests on two rows of the piles with the pipe 2, a similar pile in example 1 (without grillage and its parts). Piles installed in staggered increments in the range of 1300 mm Wall made of building blocks UDB 9, installed in three vertical rows. General cavity 10 formed by the holes in the blocks 9, reinforced frame 11 of the reinforcing wire and concrete. The holes at the bottom block 12 also concreted the pile heads in the upper part of the pipe 2. The space between the wall and the slope filled with backfill of the bulk material with particle sizes not less than 20 mm

Example 3. Retaining wall height (3-4 m) (see figure 3).

Retaining wall rests on piles with the pipe 2 and is constructed of blocks of the UDB 9 similarly as in example 1, except that the depth of the pile is 2 m, the wall is made of single-row and the blocks 9 of the lower row across the wall, the tip of one of the piles in the upper part of the tube 2 is passed through the adjacent hole in the bottom two blocks 9 and in the upper tiers of the wall laid a solid concrete blocks 13, for example blocks FBS.

The examples used only for the purposes of illustration, the capacity and the implementation of the invention and in no way limit the scope of legal protection presented in the claims, the expert in the art capable of relatively easy exercise and other ways of carrying out the invention.

1. CFA pile containing concrete barrel made directly in the well containing the reinforcing cage in the form of a metal pipe-injector, which is immersed in the hole with a gap to the design of the waiver and provided on the lower part of the perforated section with lateral injection holes arranged in tiers from the lower end of the pipe-injector, while the diameter of the hole is not more than 3d, where d is the outer diameter of the pipe-injector, characterized in that the length of the perforated area is more 3d, does not exceed L and is (0,2-0,7)L, where L is the depth of the well.

2. Pile according to claim 1, characterized in that the diameter of the hole is (1,05-2,00)d.

3. Pile according to claim 1, characterized in that the depth L is (20-30)d.

4. Pile according to claim 1, characterized in that the ratio of the inner diameter of the pipe-injector to its external diameter is equal to 0.80-0.95.

5. Pile according to claim 1, characterized in that the diameter of the injection holes is (0,25-0,40)d.

6. Pile according to claim 1, characterized in that one layer is made two or more holes with an equal pitch around the circumference of the section.

7. Pile according to claim 6, characterized in that each I is truncated made two holes, moreover, the axis of the holes adjacent layers perpendicular to each other.

8. Pile according to claim 6, characterized in that the distance between tiers is (0,5-3,0)d.

9. The pile of claim 8, wherein the tiers are made with equal step.

10. Pile according to any one of claims 1 to 9, characterized in that the upper part of the pipe-injector located above the borehole embedded in reinforced concrete grillage.

11. Pile according to claim 10, characterized in that at the upper edge of grillage a metal plate.

12. Pile according to claim 11, characterized in that the grillage contains anchor bolts attached to the lower part to the upper part of the tube of the injector and passed through holes in a metal plate.

13. Retaining wall on a pile Foundation, pile which used CFA piles, executed according to claim 1, containing a reinforcing cage in the form of a metal pipe, the upper part of which is used as the tip, thus retaining wall made of concrete blocks fixedly mounted in tiers one on top of another, as the basis of a used lower unit, and at least the upper block mounted on the lower block has a through hole, which is adjacent vertically with the mounting hole in the lower block, in addition, the total cavity formed by the mentioned holes, reinforced and concreted is.

14. The wall 13, characterized in that the total cavity is reinforced with a reinforcing rod or frame of the reinforcing wire.

15. The wall 13, characterized in that the total cavity reinforced through the upper part of the metal pipe passing through the installation hole and a member of the through hole of the upper block.

16. The wall 13, characterized in that the total cavity formed mounting hole and the through holes of two or more consecutive blocks mounted on the lower block.

17. The wall 13, characterized in that the upper block with a through hole mounted solid concrete block or blocks.

18. The wall 13, characterized in that the piles are arranged in two rows, with the pile top of the second row is also inserted with clearance through the installation hole in the lower block and concreted in it.

19. The wall 13, characterized in that the thickness of the lower block or blocks made greater than the thickness of the upper block or blocks.

20. The wall 13, characterized in that the retaining wall is made of two or more adjacent vertical rows, each of which is made of concrete blocks fixedly mounted in tiers one on top of another.

21. The wall in claim 20, characterized in that the height of the vertical rows decreases from row to row.



 

Same patents:

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

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2 cl, 4 dwg

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FIELD: foundation building.

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

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7 cl, 13 dwg

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FIELD: building, particularly to erect road embankments.

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FIELD: agriculture, particularly steep slope terracing to adapt the slope for fruit trees and other crops growth.

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EFFECT: increased slope use factor.

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FIELD: building, particularly retaining or protecting walls.

SUBSTANCE: landslide control structure comprises inclined injection piles arranged in several groups, connected one to another by grillage and built-in stable ground by lower ends thereof. The piles are united in groups each containing three piles arranged in pyramid corners so that one triangular plane defined by each pile group lies against landslide direction and is supported by struts. Above planes of neighboring triangles intersect in lower one-third part.

EFFECT: increased structure reliability and stability.

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FIELD: building, particularly for bordering or stiffening the sides of foundation pits.

SUBSTANCE: method involves driving vertical piles in ground along pit perimeter for depth exceeding pit bottom level; excavating ground up to reaching pit bottom level to open bordering member surfaces facing inwards; securing horizontal distribution beams to above surfaces to create framing belt; installing spaced cross-pieces along pit perimeter; leaning the first cross-piece ends against distribution beams and securing the second ends thereof into pit bottom ground; removing cross-pieces after reinforced concrete pit bottom forming. Ground is excavated to form inner initial pit and then stepped trench is dug out under the protection of thixotropic mix along the initial pit perimeter in direction transversal to bordering formed by piles. Lower trench step is located below pit bottom level and the second cross-piece ends are secured to above step which is then concreted under the protection of thixotropic mix. After hardening support shoe of cross-pieces trench is filled with previously excavated ground and ground is excavated of the pit up to reacting pit bottom level.

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FIELD: building, particularly engineering structures adapted for protection of linear and separate installations, including motor roads and railroads, against rock sliding, rock sloughing and mudflows.

SUBSTANCE: retaining wall includes relaxation device, face and foundation slabs rigidly secured one to another. Foundation slab is anchored in foundation ground. Relaxation device is formed of reinforced concrete slabs arranged in two longitudinal rows and secured to face slab by springs with variable spring force so that reinforced concrete slabs extend at different angles to horizon line. Low row slabs have lesser angle of inclination. Face slab and low slab row are provided with through slots. Foundation plate has cylindrical base and connected to inclined anchor by means of damping device.

EFFECT: reduced building time and operational costs for accumulating cavity cleaning, reduced labor inputs.

2 dwg

FIELD: building, particularly for slope consolidation and for stabilizing deep front landslide areas.

SUBSTANCE: structure includes foundation mat and piles formed in wells grouped in rows. Upper pile parts are embedded in foundation mat, lower one is restrained by not-sliding ground layers. Piles are composite along their lengths. Central pile parts are not filled with concrete. Heights of upper and lower pile parts decrease towards landslide head. Structure to prevent deep front land-slides comprises separate local pile groups connected by foundation mats and located within landslide body boundaries. Each foundation mat has tension bars anchored in stable slope layers and arranged under and above foundation mat along slope to retain thereof against displacement and rotation.

EFFECT: improved slope stability, increased operational reliability of structure built on wide landslides, reduced building time and material consumption.

2 dwg

The invention relates to the construction and can be used to stabilize landslides on the slopes

The invention relates to the construction, namely, devices, designed to reduce landslide pressure on pipelines located on landslide slopes

FIELD: building, particularly for slope consolidation and for stabilizing deep front landslide areas.

SUBSTANCE: structure includes foundation mat and piles formed in wells grouped in rows. Upper pile parts are embedded in foundation mat, lower one is restrained by not-sliding ground layers. Piles are composite along their lengths. Central pile parts are not filled with concrete. Heights of upper and lower pile parts decrease towards landslide head. Structure to prevent deep front land-slides comprises separate local pile groups connected by foundation mats and located within landslide body boundaries. Each foundation mat has tension bars anchored in stable slope layers and arranged under and above foundation mat along slope to retain thereof against displacement and rotation.

EFFECT: improved slope stability, increased operational reliability of structure built on wide landslides, reduced building time and material consumption.

2 dwg

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