Safe pile cutting method for foundation pit with retaining supporting piles
A technology for supporting piles and foundation pits, applied in excavation, sheet pile walls, foundation structure engineering, etc., can solve the problems of large ground subsidence and unstable foundation pits, achieve good stress conditions, increase the effective working surface, and Effect of small slot space
Inactive Publication Date: 2020-04-10
甘肃中建市政工程勘察设计研究院有限公司 +1
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Problems solved by technology
No matter in which link there is a problem, it will inevitably cause a series of problems such as unstable foundation pit and excessive ground subsidence. Once these problems occur, they will bring huge casualties and economic losses
Method used
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Embodiment
[0030] This embodiment is a method for safely cutting piles around foundation pits surrounded by supporting piles. Before pile cutting and pipe jacking operations are performed in foundation pits surrounded by self-supporting piles, anchor cables must be reinforced above the hole to ensure that the piles are cut. pit stability. Such as Figure 1 to Figure 4 As shown, the diameter of the support piles in this embodiment is 1200mm, and the pile spacing is 1000mm.
[0031] The specific construction method is as follows:
[0032] 1. Measuring and setting out: When excavating the earthwork, control the elevation of the anchor head of the anchor cable, and control the elevation and position of the hole. The holes 7 for newly reinforcing the anchor cables 4 are located 1000mm below the original bottom row of anchor cables 3 on the side wall of the foundation pit. The holes 7 are symmetrically arranged on both sides of the support pile 1 to be cut off. The middle position of the pr...
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The invention discloses a safe pile cutting method for a foundation pit with retaining supporting piles. A bidirectional support is adopted and is trapezoid and has three stress surfaces. Two of the stress surfaces are used for locking steel strands penetrating through the support in the tangential direction of the two sides of the supporting piles, reinforcing anchor cables evenly bear force, andtherefore the waist rail force transmission link is omitted, the prestress damage problem caused by deformation of waist rails does not exist, and the deformation of the foundation pit is better controlled. Another stress surface transmits resultant force of the steel strands to the supporting piles. Since the three surfaces are all pressure-bearing surfaces, the stress conditions are good. The bidirectional support is closely combined with the supporting piles, all the supporting piles evenly bear force, the locking force of the anchor cables is directly transmitted to slope piles and has nothing to do with the positioning deviation of the supporting piles, and the deformation is well controlled.
Description
technical field [0001] The invention belongs to the field of pipe jacking or shallow tunnel excavation engineering, and in particular relates to a method for safely cutting piles by supporting piles to protect foundation pits. Background technique [0002] Due to the characteristics of low construction cost, less demolition, flexibility, no need for too many special equipment, and no interference with ground traffic and the surrounding environment, the shallow burial and underground excavation method has been widely used in various underground projects across the country. In shallow buried excavation or pipe jacking construction, sometimes in order to reduce construction difficulty, reduce construction risk, and ensure construction safety, it is usually an excavation plan for shallow buried excavation or pipe jacking of road sections, and other sections. At the junction of open excavation and shallow buried excavation, according to the actual site construction conditions, su...
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IPC IPC(8): E02D17/04E02D5/74E02D9/00
CPCE02D5/74E02D9/00E02D17/04
Inventor 胡志平龙照任翔何腊平张恩祥万英喆郑芸昕刘佳琪张森安沈秋武
Owner 甘肃中建市政工程勘察设计研究院有限公司