Oblique cord pile pulling method and system

An oblique cable and anchor cable technology, which is applied in sheet pile wall, building, infrastructure engineering and other directions, can solve the problems of difficult to reach construction environment, complex process and long construction time.

Active Publication Date: 2017-08-18
南京水科院瑞迪科技集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Impact pile breaking method and full-casing wear-reducing extraction method; these two pile-extraction technologies mainly rely on full-casing drilling rigs and large cranes, so the requirements for the construction site are relatively high. The construction site has a large area and there is no clear height limit on the upper part of the site. However, the actual construction environment is difficult to achieve
[0005] 2) The method of static pressure pile extraction with full casing. This method uses steel casing and combined with spraying high-pressure water and high-pressure bentonite slurry to remove the surrounding soil of the pile, and then pulls the pile. However, the process is more complicated and the actual time is longer. , especially for the pullout of multiple piles next to each other cannot be applied
[0006] 3) Directly connect the pile head steel bar in the cast-in-place pile with the pulling pile, and apply force gradually until the pile is pulled out. However, the steel bar in the existing cast-in-place pile has low strength, unreliable welding, and uneven force, and it is easy to pull out the cast-in-place pile. The pile is pulled out, which is not allowed in the pile pulling construction
[0008] It can be seen that in the existing pile pulling technology, the investment of resistance around the pile and pulling equipment is large, the construction process is complicated, and the construction time is long

Method used

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  • Oblique cord pile pulling method and system
  • Oblique cord pile pulling method and system
  • Oblique cord pile pulling method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The oblique cable pile extraction method of the present embodiment, as figure 1 , figure 2 and image 3 shown, including the following steps:

[0044] 1) After investigation and pre-treatment, the top of the pile to be pulled 1 is first exposed, and a plurality of high-strength anchor cable materials 2 and lifting equipment are equipped at the same time;

[0045] The pile 1 to be pulled out in this embodiment can be a friction pile buried in the soil, a partially rock-socketed end-bearing pile, or an occlusal pile buried at a certain depth below the ground surface, a cap pile, a driven pile, and the like. The heads of friction piles or end-bearing piles are exposed to the ground.

[0046] The anchor cable material 2 of this embodiment can be made of metal hard or soft material. Made of metal hard, such as: bonded steel strands, prestressed steel strands, prestressed steel strands, high-strength steel wires, high-strength steel wire ropes or high-strength steel bars...

Embodiment 2

[0080] The inclined cable pile extraction method of the present embodiment is an improvement on the basis of the first embodiment, and the difference with the first embodiment is:

[0081] The total length of the pile 1 to be pulled out that needs to be promoted in this embodiment is 24m, and the pile diameter is 1500mm. After calculation, the design load of the pile pulling force is 8000kN, and the check load is 10000kN.

[0082] In this way, the anchor cable material 2 adopts 4 bundles of CPS15A-12 type shear dispersion anchor cables. Each bundle of CPS15A-14 shear dispersion type anchor cable adopts 14-φ15.24 high-strength, low-relaxation steel strands with a tensile strength of 1860MPa.

[0083] The hoisting equipment of this embodiment still adopts the through-hole jack, and selects 4 sets of 4000kN through-the-hole jacks as the lifting power equipment. Considering the efficiency of 0.8, the total lifting capacity reaches 12800kN.

[0084] Before laying out the line, fi...

Embodiment 3

[0087] The inclined cable pile pulling method of this embodiment is an improvement on the basis of Embodiment 1 and Embodiment 2. The difference from the above embodiment is that in this embodiment, in step 5), the lifting device is located on the working platform 3 on the hoist or hoist. The crane or winch is set on the reinforced concrete platform, the steel structure frame platform or the combined structure platform.

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Abstract

The invention relates to an oblique cord pile pulling method and system and belongs to the technical field of removing of piles of projects such as water conservancy, highway, railroad, municipal and bridges. The oblique cord pile pulling method comprises the following steps that (1) the top of a to-be-pulled pile is exposed through pretreatment at first; (2) a certain number of first anchor holes and second anchor holes are drilled in the top of the to-be-pulled pile; (3) one ends of a plurality of anchor cable materials are lowered to the bottoms of the first anchor holes and into the second anchor holes, and the other ends of the multiple anchor cable materials are exposed out of the top of the to-be-pulled pile; (4) grout is poured into the first anchor holes and the second anchor holes; and (5) the to-be-pulled pile is pulled up through lifting equipment, during pile pulling, the other ends, fixed in the second anchor holes, of the anchor cable materials are lifted symmetrically and asymmetrically through the lifting equipment at the same time so that the to-be-pulled pile can be pulled up or move transversely. Through the oblique cord pile pulling method and system, the pile pulling lifting force requirement can be better met, and horizontal components can be obtained during asymmetrical lifting through oblique cords, so that the pile moves horizontally, and pile pulling resistance is reduced.

Description

technical field [0001] The invention relates to a cable-cable pile pulling method and a cable-cable pile pulling system, belonging to the technical field of pile removal in water conservancy, highway, railway, bridge, municipal and other projects. Background technique [0002] In the construction of existing subway tunnels, it is necessary to raise the entire piles that affect the tunnel construction to a safe height, that is, to pull out the entire piles that affect the tunnel construction completely or partially. [0003] However, as far as the applicant knows, the existing domestic and foreign pile extraction technologies mainly adopt the following methods: [0004] 1) Impact pile breaking method and full-casing wear-reducing extraction method; these two pile-extraction technologies mainly rely on full-casing drilling rigs and large cranes, so the requirements for the construction site are relatively high. The construction site has a large area and there is no clear heigh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D9/02
CPCE02D9/02
Inventor 刘海祥柯敏勇金初阳刘璨祁峰曹俊华吴银坤鲁小涛成超
Owner 南京水科院瑞迪科技集团有限公司
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