Underground diaphragm wall bed rock grooving pre-splitting blasting method

An underground diaphragm wall and pre-splitting blasting technology, applied in blasting and other directions, can solve problems such as delaying construction period, affecting construction speed, slow punching, etc., and achieve the effect of accelerating construction speed and improving fragmentation

Active Publication Date: 2014-05-14
CHINA RAILWAY NO 2 ENG GRP CO LTD
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  • Abstract
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Problems solved by technology

However, in the geological stage where the rock is relatively hard and the rock stratum is thick, such as moderately weathered and slightly weathered, the existing groove-forming method is directly used for wall construction. The punching is slow during the construction process, which affects the construction speed and easily delays the construction period.

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with examples and specific implementation methods. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0029] The invention discloses a pre-splitting blasting method for groove formation of underground diaphragm wall bedrock, which is used for performing pre-splitting treatment on rocks with high hardness before groove formation under moderately weathered and slightly weathered bedrock geological conditions, and can speed up the progress of subsequent groove formation. The blasting method comprises the following steps:

[0030] Step 1. Exploration and hole layout: explore the geological conditions of the site to be constructed, and design the hole layout according to the geologi...

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Abstract

The invention discloses a method for performing pre-splitting treatment on hard footstones in an urban metro construction process in a blasting mode before underground diaphragm wall is grooved. The method comprises the steps of hole distribution design, drilling, downward PVC pipe putting, charging, tamping bar arrangement, blast hole blocking, initiation and the like. The cartridge bag explosion time difference is rhythmically controlled by adjusting hole distances and blasting communication and arranging explosive materials in holes in a segmentation mode, the pre-splitting treatment can be effectively performed on intermediary-weathered and weakly-weathered footstones, and accordingly the progress of the underground diaphragm wall bed rock grooving construction is accelerated.

Description

technical field [0001] The invention belongs to the field of deep foundation pit construction of subway stations, and specifically designs an underground diaphragm wall bed rock groove-forming pre-splitting blasting method. Background technique [0002] In the construction of urban subways, the underground diaphragm wall technology is widely used in the construction of deep foundation pit support systems. At present, the conventional underground diaphragm wall trenching process is mainly completed by pile punching machines. It has certain advantages under geological conditions such as sandy soil and strongly weathered rock layers. However, in the geological stage where the rock is relatively hard and the rock stratum is thick, such as moderately weathered and slightly weathered, the existing groove-forming method is directly used for wall-forming construction. The punching is slow during the construction process, which affects the construction speed and easily delays the con...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D1/055
Inventor 陈强王家祥占凡戴翔李川湖
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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