Cast-in-place pile structure based on drought salinized soil foundation

Abstract

The cast-in-place pile structure comprises a pile hole, a reinforcement cage is arranged in the pile hole, the outer side of the reinforcement cage is sleeved with a high-strength anti-corrosion geotechnical protection bag, and a plurality of concrete protection layer round cakes are installed in the circumferential direction of the reinforcement cage. A protective cap is mounted on each reinforcing steel bar at the tail end of the reinforcing steel bar cage; and concrete is poured into the high-strength anti-corrosion geotechnical protection bag to form the cast-in-place pile. The cast-in-place pile is high in structural stability and corrosion resistance, long in service life, easy and convenient to construct, low in cost, small in settling volume and worthy of application and popularization.

Description

TECHNICAL FIELD

[0001] The utility model relates to a cast-in-place pile structure technical field, concretely relates to a cast-in-place pile structure based on arid saline soil foundation. BACKGROUND

[0002] The corrosion prevention problem of steel structure and concrete in saline soil area has been the research and development target of building industry personnel, and steel and concrete are the main body of various important buildings. The structure exposed on the ground can be prevented from corrosion by regularly brushing various anticorrosive materials, but the corrosion prevention of underground engineering is more difficult. Because the components are directly contacted with strong corrosive saline soil and brine, the anticorrosive materials cannot be regularly brushed. There are large areas of saline lakes in the northwest region of China, where there are rich mineral resources and chemical raw materials, and there are also large areas of saline soil foundation which are not conducive to building. The industrial and civil buildings of mineral enterprises and chemical enterprises, railways and high-grade highways in this area are built on these saline soil foundations. The saline soil is widely distributed and has a large thickness, and the mechanical strength of the foundation soil is low and the compressibility is high, so all buildings must adopt artificial foundation or pile foundation; important buildings and railway and highway bridges must adopt reinforced concrete cast-in-place pile foundation. Because the saline soil foundation contains brine with strong corrosive sulfate and chloride ions to steel, concrete and other building materials. Therefore, it is particularly urgent to develop a high-efficiency and low-cost anticorrosive pile body. SUMMARY

[0003] The utility model aims at providing a cast-in-place pile structure based on arid saline soil foundation, which has strong structural stability and corrosion resistance, long service life, simple and convenient construction, low cost, small settlement and is worth popularization and application.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A cast-in-place pile structure based on arid saline soil foundation, comprising a pile hole, a steel reinforcement cage is arranged in the pile hole, a high-strength anticorrosive geotextile bag is sleeved on the outer side of the steel reinforcement cage, and a plurality of concrete protection layer round cakes are installed in the circumferential direction of the steel reinforcement cage; a protective cap is installed on each steel bar at the end of the steel reinforcement cage; and the high-strength anticorrosive geotextile bag is poured with concrete to form a cast-in-place pile.

[0006] Preferably, a plurality of shear-resistant pieces are installed on the side wall of the pile hole.

[0007] Preferably, the shear-resistant piece comprises a support rod installed in the side wall of the pile hole and a shear head fixedly installed on the end of the support rod.

[0008] Preferably, a lifting support is installed on the top of the reinforcement cage, a plurality of pulleys are installed in the circumferential direction of the lifting support, a plurality of control ropes are installed on the top of the high-strength corrosion-resistant earth engineering bag, and one end of the control rope is wound around the pulley; the reinforcement cage is lifted as a whole to a vertical state by using a lifting device, and the high-strength corrosion-resistant earth engineering bag is sleeved outside the reinforcement cage by pulling the control rope.

[0009] Preferably, the diameter of the high-strength corrosion-resistant earth engineering bag is slightly larger than the diameter of the pile hole, and the length of the high-strength corrosion-resistant earth engineering bag is greater than the depth of the pile hole.

[0010] In the utility model, the high-strength corrosion-resistant earth engineering bag is quickly installed outside the reinforcement cage through the lifting support, the pulley and the control rope, the installation efficiency is high, the reinforcement cage can be lifted through the lifting support, and hoisting construction is facilitated. The concrete protective layer round cake can prevent humid gas and water from penetrating, avoids reinforcement corrosion expansion, thereby protecting a concrete structure, prolonging service life, has anchoring force to reinforcement, makes reinforcement and concrete closely combine, jointly bears external force such as axial force and bending moment, and the stability of structure is enhanced. The protective cap improves the corrosion resistance of the end of the reinforcement. The shear member can effectively improve the connection strength of the cast-in-place pile and the sidewall of the pile hole, ensure the stability of the overall structure, and reduce the settlement amount in the subsequent use process. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is overall structure schematic view of the utility model;

[0012] Figure 2 It is shear member structure schematic view of the utility model;

[0013] Figure 3 It is pouring state schematic view of the utility model;

[0014] Figure 4 It is high-strength corrosion-resistant earth engineering bag installation state schematic view of the utility model;

[0015] Figure 5 It is another embodiment schematic view of the overall structure of the utility model;

[0016] In the drawing: 1, reinforcement cage;2, concrete protective layer round cake;3, protective cap;4, high-strength corrosion-resistant earth engineering bag;5, lifting support;6, pulley;7, control rope;8, shear member;9, pile sheath;10, pile hole;80, support rod;81, shear head. DETAILED DESCRIPTION

[0017] The utility model will be further described below in combination with the drawings:

[0018] As Figures 1 to 5The dry and saline land based cast-in-place pile structure shown in the embodiment comprises a pile hole 10, which is cylindrical in the embodiment. When the diameter of the pile hole 10 is smaller than the minimum space required for manual operation, the pile hole can only be formed by mechanical dry operation. In the embodiment, the diameter of the pile hole 10 is not smaller than the minimum space required for manual operation, so that the pile hole can be formed by manual operation or mechanical dry operation.

[0019] A reinforcement cage 1 is arranged in the pile hole 10, which is prefabricated according to the size of the cast-in-place pile. A plurality of concrete protection layer round cakes 2 are uniformly arranged on the outer side of the reinforcement cage 1. The concrete protection layer round cakes 2 can prevent the penetration of humid gas and water and avoid the rust expansion of the reinforcement, thereby protecting the concrete structure, prolonging the service life, anchoring the reinforcement, making the reinforcement and the concrete tightly combined, jointly bearing external forces such as axial force and bending moment, and enhancing the stability of the structure. A protective cap 3 is arranged on the end of each reinforcement of the reinforcement cage 1. The protective cap 3 can avoid scratching the high-strength corrosion-resistant geotextile bag 4 when the high-strength corrosion-resistant geotextile bag 4 is installed, and can also avoid damaging the rust-proof layer on the surface of the reinforcement, thereby ensuring the mechanical properties of the reinforcement and ensuring that the reinforcement cage 1 can normally play a bearing role in the underground structure. A rust-proof and corrosion-resistant coating is brushed on the outer surface of the reinforcement of the reinforcement cage 1.

[0020] The high-strength corrosion-resistant geotextile bag 4 is sleeved on the outer side of the reinforcement cage 1, and the cast-in-place pile is formed by pouring concrete in the high-strength corrosion-resistant geotextile bag 4. Before the high-strength corrosion-resistant geotextile bag 4 is installed, a lifting support 5 is installed on the top of the reinforcement cage 1, a plurality of pulleys 6 are installed on the periphery of the lifting support 5, and a plurality of control ropes 7 are installed on the top of the high-strength corrosion-resistant geotextile bag 4. One end of each control rope 7 is wound around one pulley 6 and located on the outer bottom of the reinforcement cage 1. Then, the reinforcement cage 1 is lifted to a vertical state by using a lifting device, and the control ropes 7 are pulled by an operator to sleeve the high-strength corrosion-resistant geotextile bag 4 on the outer side of the reinforcement cage 1 from the bottom to the top.

[0021] A plurality of shear-resistant pieces 8 are installed on the side wall of the pile hole 10. The shear-resistant piece 8 comprises a support rod 80 installed in the side wall of the pile hole and a shear head 8 fixedly installed on the end of the support rod 80. The support rod 80 is inclined or horizontally arranged. In the embodiment, the support rod 80 is inclined downward, and the shear head 81 is in contact with the high-strength corrosion-resistant geotextile bag 4. After pouring concrete, the shear head 81 makes the high-strength corrosion-resistant geotextile bag 4 locally inwardly concave, clamped on the formed cast-in-place pile, and forms a shear-resistant effect. The shear head 81 is a circular pipe, an arc-shaped connector or a U-shaped protrusion. The support rod 80 is a reinforcement, and the front end has a sharp tip for inserting into the soil. An installation hole is drilled in the pile hole during installation. In a preferred embodiment, a spiral structure is arranged on the outer side of the support rod 80, which can be directly installed by screwing, thereby improving the installation efficiency.

[0022] The diameter of the high-strength anticorrosion geotextile bag 4 is slightly larger than the diameter of the pile hole, and the length of the high-strength anticorrosion geotextile bag 4 is greater than the depth of the pile hole. When the concrete is poured, the high-strength anticorrosion geotextile bag 4 is ensured to be as close as possible to the pile hole 10 to ensure the stability of the overall structure of the cast-in-place pile and reduce the backfill operation.

[0023] When the ground soil is relatively soft, the pile sheath 9 is first installed in the pile hole 10, and one end of the shear member 8 is located inside the pile sheath 9, that is, the shear head 81 is located inside the pile sheath 9 and in contact with the high-strength anticorrosion geotextile bag 4, for improving the shear capacity. The other end of the shear member 8 passes through the pile sheath 9 and is connected to the side wall of the pile hole, so that the pile sheath 9 is tightly and fixedly connected with the ground soil, improving the stability of the cast-in-place pile and reducing the settlement.

[0024] The above embodiments are only a number of descriptions of the concept and implementation of the present application, and are not limiting. Under the concept of the present application, the technical solutions without substantial changes are still within the protection scope.

Claims

1. A cast-in-place pile structure based on a drought and saline soil foundation, comprising a pile hole, characterized in that: A reinforcing cage is arranged in the pile hole, a high-strength anticorrosion geotextile bag is sleeved outside the reinforcing cage, and a plurality of concrete protection layer round cakes are installed on the circumference of the reinforcing cage; a protection cap is installed on each reinforcing bar at the end of the reinforcing cage; and the high-strength anticorrosion geotextile bag is poured with concrete to form a cast-in-place pile.

2. The bored pile structure based on arid saline soil foundation according to claim 1, characterized in that: A plurality of shear-resistant pieces are installed on the side wall of the pile hole.

3. The bored pile structure based on arid saline soil foundation according to claim 2, characterized in that: The shear-resistant piece comprises a support rod installed in the side wall of the pile hole and a shear head fixedly installed on the end of the support rod.

4. The bored pile structure based on arid saline soil foundation according to claim 1 or 3, characterized in that: A lifting support is installed on the top of the reinforcing cage, a plurality of pulleys are installed on the circumference of the lifting support, a plurality of control ropes are installed on the top of the high-strength anticorrosion geotextile bag, and one end of the control rope is wound around the pulley; a reinforcing cage is hoisted to a vertical state as a whole by using a lifting device, and the high-strength anticorrosion geotextile bag is sleeved outside the reinforcing cage by pulling the control rope.

5. The bored pile structure based on arid saline soil foundation according to claim 1 or 2, characterized in that: The diameter of the high-strength anticorrosion geotextile bag is slightly larger than the diameter of the pile hole, and the length of the high-strength anticorrosion geotextile bag is greater than the depth of the pile hole.

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