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A new method of caisson blasting to assist sinking

A caisson and well wall technology, which is applied in caisson, construction, infrastructure engineering and other directions, can solve the problems of deep well foundations failing to sink smoothly, delaying construction progress, unable to overcome the reaction force of bottom support force, etc., and achieving safe, reliable and practical , Improve the effect of sinking effect

Active Publication Date: 2019-03-12
中铁二十三局集团(湖北)爆破有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after reaching the clay layer during the sinking process, these sinking aid methods cannot effectively and quickly remove and discharge obstacles when encountering relatively hard obstacles or strata and other similar geological conditions, resulting in the failure of the deep well foundation to sink smoothly, delaying Construction Schedule
[0005] The biggest problem with the caisson construction method is that during the sinking process, after reaching the clay layer, due to its own weight, it cannot overcome the reaction forces such as the support force at the bottom and the friction force on the well wall, so that it cannot continue to use ordinary soil discharge methods to sink to achieve design elevation

Method used

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  • A new method of caisson blasting to assist sinking
  • A new method of caisson blasting to assist sinking
  • A new method of caisson blasting to assist sinking

Examples

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Embodiment 1

[0051] The invention discloses a method for assisting sinking by caisson blasting. as attached Figure 1-3 As shown, the equipment includes a pre-embedded steel pipe 2, a pre-embedded PVC pipe 3, a PVC casing 4, a dredger 8, a geological drilling rig 9, a seismic source charge 10, a nonel detonator 11, a fixed steel bar 12, and a connecting sleeve 13. When making the caisson platform, bury the pre-buried PVC pipe 3 and the connecting sleeve 13 in the caisson wall 1 according to a certain hole row spacing, as the drilling guide pipe; Reinforcing bar 12 connects two pipes firmly. Before drilling and blasting, use the dredge 8 to suck up the loose layer 6 to provide a free surface for the blasting in the mud suction blind area. After the caisson platform cannot sink normally by its own weight, use the geological drilling rig 9 to place the drill bit 5 downward along the pre-buried drilling guide pipe, and start drilling when the drill bit 5 reaches the clay layer 7; After the...

Embodiment 2

[0053] The invention discloses a method for assisting sinking by caisson blasting. Except following technical parameter, all the other are with embodiment 1. In the caisson blasting operation of the main tower foundation of a bridgehead in Hanyang, Wuhan, the inner diameter of the pre-embedded PVC pipe 3 is 146mm; the diameter of the drill bit 5 is 110mm; the drilling depth is measured with a measuring rope to ensure that the drill bit drills at least 3m after it comes out of the well wall; Carry out the charging operation for the required drilling holes, and use a 90mm drill bit to send the PVC-U pipe with an outer diameter of 100mm to the bottom of the hole for the drilling holes that do not meet the requirements, so as to ensure that 50cm of the PVC-U pipe remains in the embedded pipe.

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Abstract

The invention relates to a novel explosion sinking assistance method for an open caisson. An open caisson foundation is made to sink by removing underwater hard clay and stone or cementation layers and other hard formations through explosions. The novel explosion sinking assistance method includes the steps that S1, embedded pipes are installed in an open caisson platform; S2, a free face is provided for the explosions in the manner that mud is sucked inside a shaft; S3, hole drilling is conducted through a geological drilling rig; S4, charging is conducted; and S5, networking and detonating are conducted. The feasible method for effectively assisting in open caisson sinking through the explosion means is put forward, and because explosion apparatuses for civil use are adopted for the method, the sinking effect is improved and the novel explosion sinking assistance method is safe, reliable and feasible.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, and in particular relates to a caisson blasting-assisted sinking method for removing relatively hard strata such as underwater hard clay, stones or cemented layers by blasting to sink a caisson foundation. Background technique [0002] The caisson foundation is a form of underground structures and deep foundations constructed by the caisson method. It is to make a well-shaped structure (caisson) on the surface first, and then continuously excavate soil from the well under the enclosure of the well wall, so that the caisson will gradually sink under the action of its own weight, and after reaching the predetermined design elevation, then Make the back cover and build the internal structure. The buried depth of the caisson can be very large, the integrity is strong, the stability is good, the bearing area is large, and it can withstand large vertical loads and horizontal loads. It is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D23/08
CPCE02D23/08
Inventor 陈德志李本伟罗鹏胡浩川周应军甄梦阳安玉东李克菲张萍何国敏
Owner 中铁二十三局集团(湖北)爆破有限公司
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