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Joint soil nail-reinforcing construction method for foundation micropiles of slope top tower cranes for deep foundation pits

A construction method and soil nailing technology, which can be applied in basic structure engineering, construction, etc., can solve the problems that the installation of the tower crane on the top of the foundation pit cannot be realized, and achieve the effects of small construction area, small impact on the surrounding environment, and short construction period

Inactive Publication Date: 2013-04-03
CHINA CONSTR SEVENTH ENG DIVISION CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the temporary construction land where the tower crane is located is narrow, large equipment cannot enter the site at all, and the installation of the tower crane on the top of the foundation pit cannot be realized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] Embodiment: The construction method of micro-piles combined with soil nails on the top of a deep foundation pit with a tower crane foundation, which comprises the following steps:

[0016] 1) Level the site, make a significant mark at the position where the hole needs to be drilled, and use a manual Luoyang shovel or a small drill to form the hole. The diameter and depth of the hole meet the design requirements; the steel pipe should be placed in time after the hole is completed, and the steel pipe should be placed in the center of the hole. .

[0017] The verticality of the hole is not more than 1%, the allowable error of the hole diameter is ±5mm, the allowable deviation of the pile position is 150mm, the hole depth should meet the design requirements, if there is too much empty soil at the bottom of the hole, the hole depth should be deepened, and the design of the pile is calculated according to the friction pile .

[0018] 2) Grouting, use a plastic pipe as a cond...

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Abstract

The invention discloses a joint soil nail-reinforcing construction method for foundation micropiles of slope top tower cranes for deep foundation pits, which includes the following steps: the site is leveled up, positions where holes need to be drilled are clearly marked, a manual Luoyang shovel or a small drilling machine is adopted to drill the holes, the diameter and depth of each hole need to meet design requirement, and steel pipes need to be inserted into the holes as soon as the holes are drilled, and are centered in the holes; in the injection of cement paste, a plastic pipe is adopted as a conduit, a stop plug is arranged in the orifice of the plastic pipe, and the mixed cement paste is injected to the bottoms of the drilled holes and from the bottoms of the holes to the outside under normal pressure; a tower crane foundation is excavated to a designed elevation, and soil nail hole construction and cement injection are carried out around the foundation pit; exposed soil nail reinforcements and the steel pipes are bound together, and concrete is poured, so that the ends of the soil nails, the steel pipes and the tower crane foundation are formed into a whole body. Since the joint soil nail-reinforcing construction method adopts the Luoyang shovel or the small drilling machine to drill the holes, the safety management of the construction site is benefitted. The steel pipes are directly inserted into the holes. The construction period is short, the consumption of electricity is less, the land occupied by construction is small, and the affection on the surrounding environment is less.

Description

technical field [0001] The invention relates to a reinforcement construction method of micro-piles combined with soil nails for foundation pits with tower cranes on slope tops. Background technique [0002] In engineering construction, tower cranes are often used to solve the problem of vertical transportation of equipment and materials, and the stability of tower cranes must be considered in the foundation design of tower cranes. Since the tower cranes located on the top of slopes in deep foundation pit projects, in order to meet their own stability and the opposite side To meet the requirements of slope safety, pile foundation is usually adopted. Pile foundation construction requires large-scale pile equipment. If manual hole-digging piles are used, their use is restricted in some areas due to safety considerations. Using large-scale pile equipment to construct on the top of the slope itself is an unsafe factor for the slope of the foundation pit. [0003] In recent year...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/42
Inventor 焦安亮黄延铮闫亚召侯振国
Owner CHINA CONSTR SEVENTH ENG DIVISION CORP LTD
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