Enclosing purlin protection pretreatment method before demolition blasting of deep foundation pit supporting beam

A technology for deep foundation pits and supporting beams, which is applied in protection devices, excavation, and infrastructure engineering, etc. It can solve the problems of prolonging the construction period, affecting the effect of blasting fragmentation, and increasing the cost of demolition, so as to reduce hazards, effectively use explosive energy, and improve construction efficiency. convenient effect

Inactive Publication Date: 2017-05-31
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in order to ensure the stability of the support structure of the foundation pit and the surrounding buildings when blasting and demolishing the supporting beams of the deep foundati

Method used

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  • Enclosing purlin protection pretreatment method before demolition blasting of deep foundation pit supporting beam
  • Enclosing purlin protection pretreatment method before demolition blasting of deep foundation pit supporting beam
  • Enclosing purlin protection pretreatment method before demolition blasting of deep foundation pit supporting beam

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A pretreatment method for purlin protection before blasting demolition of support beams in deep foundation pits. In this embodiment, the deep foundation pit horizontal support beam (1) has foot supports and truss supports, and the length of the connecting surface of the deep foundation pit horizontal support beam (1) and the purlin (2) is 2200mm; Section size is: height h=1000mm, width A=1200mm.

[0034] The concrete steps of the technical solution adopted in this embodiment are:

[0035] Step 1. Determination of reserved area

[0036] The structure and size of the horizontal support beam (1) and purlin (2) of the deep foundation pit to be demolished provided according to the design drawing of the support beam in the deep foundation pit, such as figure 1 and figure 2 As shown, a reserved area (3) is provided on the upper surface of the purlin (2).

[0037] Such as figure 1 and figure 2 As shown, the reserved area (3) is rectangular, and the length B of the reser...

Embodiment 2

[0056]A pretreatment method for purlin protection before blasting demolition of support beams in deep foundation pits. Present embodiment except following technical parameters, all the other are with embodiment 1:

[0057] In this embodiment, the horizontal support beam (1) of the deep foundation pit has foot supports and truss supports, and the length of the connecting surface of the horizontal support beam (1) and the purlin (2) of the deep foundation pit is 2500mm; Section size is: height h=1400mm, width A=1400mm.

[0058] The length B=2200mm of reserved area (3) described in the present embodiment, the width of reserved area (3) is A'

[0059] A'=0.4~0.5A (1)

[0060] From: A=1400mm;

[0061] Then: A'=560~700mm.

[0062] The pre-embedded PVC pipes (4) in this embodiment are 3-4 rows, and the distances between the outer two rows of pre-embedded PVC pipes (4) and the respective adjacent long sides of the reserved area are 80-90 mm. The row spacing of each row is a=220~2...

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Abstract

The invention relates to an enclosing purlin protection pretreatment method before demolition blasting of a deep foundation pit supporting beam. The technical scheme is that the upper surface of an enclosing purlin (2) is provided with a rectangular reserve zone (3), and the length B of the reserve zone (3) is a horizontal length of a connecting face of the enclosing purlin (2) and a horizontal supporting beam (1); a long side of the reserve zone (3) is overlapped with the connecting side of the enclosing purlin (2) and the horizontal supporting beam (1). 2-4 lines of embedding PVC pipes (4) are arranged at the reserve zone (3), and the line space a of every line is equal to 200-250 mm, and the hole space b is equal to 140-160 mm. The embedding PVC pipe (4) is embedded in the form of quincunx, and the embedding PVC pipe (4) is perpendicular to the reserve zone (3). Before pouring the reinforcement concrete to the foundation pit supporting beam, the embedding PVC pipe (4) is fixed in the reserve zone (3), and the lower end of the embedding PVC pipe (4) is located at the bottom part of a template of the enclosing purlin (2); the upper end of the embedding PVC pipe (4) is 40-80 mm higher than the upper surface of the enclosing purlin (2). The enclosing purlin protection pretreatment method is featured by low construction cost, good safety, short construction cycle, good breaking effect and resource saving.

Description

technical field [0001] The invention belongs to the technical field of blasting demolition of supporting beams of deep foundation pits. In particular, it relates to a purlin protection pretreatment method before blasting demolition of support beams in deep foundation pits. [0002] Background technique: [0003] With the continuous development of urbanization, various large-scale deep foundation pits have also increased, and the amount of demolition of reinforced concrete support beams in deep foundation pits (abbreviated as deep foundation pit support beams) has gradually increased. The blasting demolition method of supporting beams in deep foundation pits has the characteristics of short demolition period, fast slag discharge, recyclable waste steel bars and resource saving. [0004] Blasting safety is the primary concern in blasting demolition construction. Part of the support structure needs to be protected in blasting demolition of support beams in deep foundation pits,...

Claims

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Application Information

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IPC IPC(8): E02D31/00E02D17/04
CPCE02D17/04E02D31/00E02D2300/002
Inventor 钟冬望涂圣武李琳娜何理司剑峰陈晨黄雄卢哲
Owner WUHAN UNIV OF SCI & TECH
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