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Auxiliary blasting construction technology in rotary drilling hole used for rock-socketed pile foundation

A construction technology, a technology in drilling, applied in blasting, foundation structure engineering, sheet pile walls, etc., can solve the problems of not maximizing the effect, long drilling time, high drilling cost, etc., to avoid low construction efficiency, The effect of shortening the process time and avoiding hidden dangers of quality and safety

Inactive Publication Date: 2020-09-22
CHINA FIRST HIGHWAY ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides an auxiliary blasting construction technology for rotary drilling boreholes for rock-socketed pile foundations, which solves the problem that the existing bored piles take a long time to drill and the effect cannot be maximized. , high drilling costs and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An auxiliary blasting construction technology in a rotary drilling borehole for a rock-socketed pile foundation, comprising the following steps:

[0022] S1. Construction preparation, first excavate in place on the working platforms of piers 1, 2, and 3 on the left, the effective pile length is 18 meters, and the rock-socketing depth is 18 meters, and then prepare a down-the-hole drilling rig (type 200, drilling tool diameter 138mm ), 160mm diameter liner 60 meters, one Sany rotary drilling rig (SR425);

[0023] S2. Hole position layout, since the pile foundation platform of No. 1, 2, and 3 pier on the left is located on the gneiss bedrock, the down-the-hole drilling has canceled the mold, and the hole is directly drilled after the measurement and lofting. The diameter of the pile foundation is 2.2 meters. The depth is 18 meters, the number of drilling holes is 12, and the cumulative construction time is 24 hours. The hole depth is measured after the hole is formed to p...

Embodiment 2

[0029] S1. Construction preparation, prepare a down-the-hole drilling rig (type 200, drilling tool diameter 138mm), a set of drilling molds (12 holes with a diameter of 2.2 meters) (9 holes with a diameter of 2.0 meters), a liner with a diameter of 160 mm, 60 meters, One Sany rotary drilling rig (SR425).

[0030] S2. The 2-4 meters of covering soil on pier No. 1 and No. 2 on the right is medium-weathered gneiss. For pile foundations such as blasting and pre-cracking, a rotary drilling drill is required to drill holes to install the casing first. After the rotary drilling rig reaches the rock Withdraw the hole position and use a crane to install the mold. The surveyor is responsible for measuring that the center of the mold is consistent with the center of the pile foundation, the top surface of the mold is horizontal, and the verticality of the vertical guide pipe is less than 1%. After the measurement is passed, insert the inner liner pipe with a diameter of 160mm into the mol...

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Abstract

The invention provides an auxiliary blasting construction technology in a rotary drilling hole used for a rock-socketed pile foundation, and relates to the technical field of building construction. The auxiliary blasting construction technology in the rotary drilling hole used for the rock-socketed pile foundation comprises the following steps that S1, construction preparation is conducted, specifically, firstly, a pile pier working platform is dug in a construction site, and then main construction equipment is prepared; S2, hole site arrangement is conducted, specifically, drilling is carriedout at the pile pier by using a down-the-hole drill, 12 drilled holes are formed in the pile diameter of 2.2 m, 9 drilled holes are formed in the pile diameter of 2.0 m; and S3, explosive filling isconducted, specifically, after drilling is completed, explosive filling is conducted, specifically, 2 # rock emulsion explosive is adopted as the explosive, a millisecond tube is adopted as a detonator to be installed in two sections, the detonator and the explosive and the explosive and the explosive are bound firmly by adopting adhesive tape, and scratching damage during explosive filling is prevented. By using the auxiliary blasting construction technology in the rotary drilling hole used for the rock-socketed pile foundation, the working procedure time can be greatly shortened, the construction expenditure is reduced, and meanwhile potential quality safety hazards caused by manual hole digging are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to an auxiliary blasting construction technology used in rotary drilling boreholes for rock-socketed pile foundations. Background technique [0002] Bored piles are a common form of foundation in engineering. Rotary drilling rigs are used more and more widely in engineering foundation construction. Rotary drilling rigs have high efficiency and fast hole formation, which effectively shortens the construction period. However, the rotary drilling drill cannot give full play to the advantages of the rotary drilling drill in areas where the rock strength is relatively high. There are the following disadvantages: [0003] (1) Continuing to use rotary drilling for construction, there will be disadvantages such as low efficiency, non-moving drilling, serious wear of drilling tools, long drilling time, less than maximum effect, high drilling cost, etc., and the rotary drilling...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04E02D5/34
CPCF42D1/00F42D3/04E02D5/34
Inventor 余昌平白雪杉何凡李丙涛魏富鸿李闯鲁泽建贺哲军王勤富陈章锋
Owner CHINA FIRST HIGHWAY ENG