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Fast trenching construction method for underground continuous wall in weakly weathered rock

A construction method and technology for trenching construction, which is applied to earth movers/shovels, construction, etc., can solve the problems of difficulty in trenching in rock formations, construction speed, etc., to solve the problem of verticality control of trenches, ensure construction quality, The effect of ensuring the quality of groove formation

Inactive Publication Date: 2020-08-11
NO 1 ENG CO LTD OF CHINA RAILWAY 22ND CONSTR BUREAU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for special bottom layers, such as solving the difficulties of grooving rock formations and construction speed, etc.

Method used

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  • Fast trenching construction method for underground continuous wall in weakly weathered rock
  • Fast trenching construction method for underground continuous wall in weakly weathered rock
  • Fast trenching construction method for underground continuous wall in weakly weathered rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 Construction line of a certain line of Guangzhou Metro

[0027] According to the construction of a certain line of Guangzhou Metro, there are mainly the following difficulties:

[0028] 1) The bearing capacity of the upper silt layer is extremely poor, and the holes are easy to collapse when forming grooves: the upper silt layer in the field is thick and the bearing capacity is extremely poor, resulting in large-scale equipment such as double-wheel milling, grabbing buckets, down-the-hole hammers, and crawler cranes. The risk is high; when the ground connection wall is grooved, it is easy to collapse the hole, and the concrete disturbance in the first phase of the groove is serious.

[0029] 2) The rock surface fluctuates greatly, the strength is uneven, and it is difficult to correct the deviation of the groove: there are many inclined rocks and the uneven strength makes it difficult to correct the deviation of the lead hole of the pile driver and the doub...

Embodiment 3

[0120] Embodiment 3 Grooving process contrast

[0121] (1) double wheel milling groove

[0122] The 2A29, 2A31, and 3A1 groove sections are separately formed by double-wheel milling. Among them, the 2A29 groove section enters the medium weathering of 4.2 meters, and the 2A31 and 3A1 enters the micro-weathering. Since the rock formation strength reaches above 100Mpa, the construction time for single-width groove formation exceeds 26 days ( Not yet grooved), the efficiency of double-wheel milling is 0.08m / h, and the double-wheel milling equipment is often damaged, and the double-wheel milling groove operation is suspended. Therefore, the efficiency of double-wheel milling alone in hard rock is extremely low and the cost is extremely high. high;

[0123] (2) Down-the-hole drilling + double-wheel milling into slots

[0124] The 2A34 groove section adopts the down-the-hole drill to guide the hole. In the first and second positions of the double-wheel milling, each knife has a tot...

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Abstract

The invention discloses a fast trenching construction method for an underground continuous wall in weakly weathered rock. The method includes the following steps: (1) surveying and setting out; (2) guide wall construction; (3) slurry preparation; (4) underground continuous wall trenching construction, wherein a hydraulic grab bucket is adopted for trenching in soil layers above rock strata, afterconstruction is started in intensely weathered and low-intensity weakly weathered rock strata, a double-wheel trench cutter is adopted for into-rock drilling, when the rock strength is high, the double-wheel trench cutter is adopted for into-rock drilling after a percussion drill or a rotary drill is adopted for hole guiding, and the percussion drill is adopted to organize construction for underground continuous wall trenching under a 500 kv high-voltage line; (5) bottom cleaning and wall brushing; and (6) trenching acceptance check. The trenching construction method solves the problems that trenching in hard rock or oblique rock is difficult, the trenching verticality cannot be ensured, steel bars are milled, the underground continuous wall has joints and the working efficiency of the double-wheel trench cutter in the weakly weathered rock is low, the trenching speed of a double-wheel trench cutter method is increased, and the construction quality of the underground continuous wall isensured.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method for rapid groove formation of a ground connection wall inserted into slightly weathered rock. Background technique [0002] In recent years, due to the improvement of urban traffic, the rapid development of subways at home and abroad, with the vigorous promotion of the construction of rail transit projects in coastal cities in my country, the construction of excavated diaphragm walls in subways and urban buildings passes through different types of strata from top to bottom. Under these conditions, how to ensure the safety, quality and construction speed of construction is worthy of our in-depth discussion. [0003] At present, there are many studies on the stability of the groove wall in China, and some achievements have been made. For example, by improving the control factors that affect the stability of the groove wall, the effect of the soft ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F5/02E02F5/08
CPCE02F5/025E02F5/08
Inventor 兰峰涛田作华王天武李翰卿陈汉庞前凤赵小兵江龙邹园林高利平李海亮王峰刘崇郭亮刘广
Owner NO 1 ENG CO LTD OF CHINA RAILWAY 22ND CONSTR BUREAU
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