CN106759526A - Purlin protection preprocess method is enclosed before a kind of Brace in Deep Footing Groove beam demolition blasting - Google Patents

Purlin protection preprocess method is enclosed before a kind of Brace in Deep Footing Groove beam demolition blasting Download PDF

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Publication number
CN106759526A
CN106759526A CN201611168205.6A CN201611168205A CN106759526A CN 106759526 A CN106759526 A CN 106759526A CN 201611168205 A CN201611168205 A CN 201611168205A CN 106759526 A CN106759526 A CN 106759526A
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CN
China
Prior art keywords
pvc pipe
buried pvc
trough
purlin
buried
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CN201611168205.6A
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Chinese (zh)
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CN106759526B (en
Inventor
钟冬望
涂圣武
李琳娜
何理
司剑峰
陈晨
黄雄
卢哲
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Wuhan University of Science and Engineering WUSE
Wuhan University of Science and Technology WHUST
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Wuhan University of Science and Engineering WUSE
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Priority to CN201611168205.6A priority Critical patent/CN106759526B/en
Publication of CN106759526A publication Critical patent/CN106759526A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete

Abstract

Purlin protection preprocess method is enclosed before the present invention relates to a kind of Brace in Deep Footing Groove beam demolition blasting.Its technical scheme is:Rectangle trough (3) is provided with purlin (2) upper surface is enclosed, the length B of trough (3) is the horizontal length for enclosing purlin (2) and horizontal shore (1) joint face, and trough (3) is long to be overlapped while with the connection for enclosing purlin (2) and horizontal shore (1).The pre-buried pvc pipe of 2 ~ 4 rows (4) are set in trough (3), array pitch a=200 ~ 250mm, pitch-row b=140 ~ 160mm is often arranged.It is in quincunx that the cloth of the pre-buried pvc pipe (3) buries mode, and pre-buried pvc pipe (4) is perpendicular to trough (3).Before foundation pit reinforced concrete support beam is poured, the pre-buried pvc pipe (4) is fixed in trough (3):The lower end of the pre-buried pvc pipe (4) is located at the template bottom for enclosing purlin (2), and the upper end of pre-buried pvc pipe (4) is higher by the 40 ~ 80mm of upper surface for enclosing purlin (2).The present invention has the characteristics of construction cost is low, security is good, the construction period is short, crushing effect good and economizes on resources.

Description

Purlin protection preprocess method is enclosed before a kind of Brace in Deep Footing Groove beam demolition blasting
Technical field
The invention belongs to Brace in Deep Footing Groove beam Blasting Demolition Technology field.More particularly to a kind of Brace in Deep Footing Groove beam explosion is torn open Except preceding encloses purlin protection preprocess method.
Background technology:
With continuing to develop for Process of Urbanization Construction, various large deep foundation pits also increase therewith, the reinforced concrete in deep basal pit The dismounting amount of native support beam (abbreviation Brace in Deep Footing Groove beam) gradually increases.Deep basal pit inner support beam demolition blasting method has removes work Phase is short, fast, the recyclable waste steel bar and the characteristics of economize on resources of slagging tap, it is domestic at present using demolition blasting method to deep basal pit strutbeam Support is removed, and is most widely used.
Shotfiring safety is the problem of first concern in the construction of demolition blasting method, the part in Brace in Deep Footing Groove beam demolition blasting Supporting construction is need to be to be protected, i.e., can not produce destruction to it in demolition blasting, and such as subterranean wall is needed in construction in later period It is continuing with, therefore, have to consider the safety problem of subterranean wall before demolition blasting.In structure, due to enclosing purlin and underground Wall is connected, and the explosion wave that Brace in Deep Footing Groove beam is produced in explosion will be directly passed to subterranean wall by enclosing purlin, when When blast impulse intensity of wave is more than subterranean wall shock wave resistance intensity, subterranean wall will occur destruction and damage.
At present, it is to ensure that foundation pit supporting construction and surrounding are built when demolition blasting construction is carried out to Brace in Deep Footing Groove beam The stability of thing is built, often using the method that explosive payload is reduced in blasting process, this method influences explosion and crushing effect, extension Duration, improve dismounting cost.
The content of the invention
It is contemplated that overcoming prior art defect.Purpose is that a kind of construction cost of offer is low, security is good, construction work The preprocess method of purlin is enclosed in the protection of the Brace in Deep Footing Groove beam demolition blasting that the phase is short, crushing effect is good and economizes on resources.
In order to solve the above technical problems, the technical solution adopted by the present invention is comprised the concrete steps that:
Step one, the determination of trough
The deep basal pit horizontal shore (1) to be torn open provided according to deep basal pit inner support beam design drawing and the structure for enclosing purlin (2) And its size, it is provided with trough (3) purlin (2) upper surface is enclosed.
The trough (3) is rectangle, and the length B of trough (3) is to enclose purlin (2) with horizontal shore (1) joint face Horizontal length, one of trough (3) long to overlap while with the connection for enclosing purlin (2) and horizontal shore (1), trough (3) Width is A '
A '=0.3~0.5A (1)
In formula (1):A represents the width for enclosing purlin (2), mm.
The setting of step 2, pre-buried pvc pipe (4)
In the trough (3), pre-buried pvc pipe (4) is set;Pre-buried pvc pipe (4) is 2~4 rows, the pre-buried PVC of the row of outside two The distance for closing on side long respective with trough is 80~100mm to pipe (4) respectively.The array pitch a=200 for often arranging~250mm, pitch-row B=140~160mm.It is in quincunx that the cloth of the pre-buried pvc pipe (3) buries mode, and pre-buried pvc pipe (4) is perpendicular to trough (3).
The fixation of step 3, pre-buried pvc pipe (4)
Before foundation pit reinforced concrete support beam is poured, first as described in step 2 pre-buried pvc pipe (4) setting, will be described Pre-buried pvc pipe (4) is fixed in the trough (3):The lower end of the pre-buried pvc pipe (4) is located at the template bottom for enclosing purlin (2) Portion, the upper end of pre-buried pvc pipe (4) is higher by the upper surface for enclosing purlin (2);Block the upper port of pre-buried pvc pipe (4).
Step 4, casting concrete and the pre-buried pvc pipe (4) of cleaning
During casting concrete, artificial vibrated concrete will avoid pre-buried pvc pipe (4);In demolition blasting deep basal pit level branch Before support beam (1), tamper in the pipe of pre-buried pvc pipe (4) is cleared up.
The specification of the pre-buried pvc pipe (4) is D40;The length of pre-buried pvc pipe (4) is L
L=h+ △ L (2)
In formula (2):H represents the height for enclosing purlin (2) cross section, mm;
△ L represent that pre-buried pvc pipe (4) is higher by the height for enclosing purlin (2), mm;
△ L=40~80mm.
There is following good effect compared with prior art due to using above-mentioned technical proposal, the present invention:
The present invention horizontal shore (1) and enclose purlin (2) junction enclose at purlin (2) upper surface set trough (3), Before reinforced concrete brace is poured, mode is buried using quincunx cloth pre-buried pvc pipe (4) is arranged in the trough (3), To form air curtain.The preparation method of pre-buried pvc pipe (4) is simple, and the construction period is short, easy construction, can not only effectively utilize Explosive energy, reduces explosive specific charge, and can ensure that in explosion and crushing effect and protection foundation ditch and enclose purlin structure and diaphram wall Stability, improves the security of surrounding enviroment.
In Brace in Deep Footing Groove girder construction, it is connected with deep basal pit horizontal shore (1) and subterranean wall due to enclosing purlin (2), The explosion wave that deep basal pit horizontal shore (1) is produced in demolition blasting will be directly passed to underground by enclosing purlin (2) Wall, when blast impulse intensity of wave is more than subterranean wall shock wave resistance intensity, subterranean wall will occur destruction and damage.And the air The formation of curtain, can be such that the explosion wave produced during deep basal pit horizontal shore (1) explosion occurs at the air curtain Reflection, so that the energy that blast is produced is fully used, deep basal pit horizontal shore (1) explosion and crushing effect is better It is good;The air curtain effectively blocks the transmission of explosion wave, reduces explosion wave and connects to enclosing purlin (2) and underground The harm of continuous wall, crushing effect is good and economizes on resources.
Therefore, the present invention has that construction cost is low, security is good, the construction period is short, crushing effect good and economizes on resources Feature.The present invention is applicable not only to the demolition blasting of reinforced concrete brace in foundation ditch, is also widely used for frame structure building The blasting and dismantling engineerings such as room, factory building.
Brief description of the drawings
Fig. 1 is one kind application schematic perspective view of the invention;
Fig. 2 is the top plan view of Fig. 1;
Fig. 3 is the C-C schematic cross-sectional views of Fig. 2.
Specific embodiment
With reference to specific embodiment, the invention will be further described, not to the limitation of its protection domain.
Embodiment 1
Purlin protection preprocess method is enclosed before a kind of Brace in Deep Footing Groove beam demolition blasting.In the present embodiment, deep basal pit level Support beam (1) has heel brace and truss to support, and deep basal pit horizontal shore (1) and the joint face length for enclosing purlin (2) are 2200mm;Enclose purlin (2) cross sectional dimensions is:Height h=1000mm, width A=1200mm.
The technical scheme that the present embodiment is used is comprised the concrete steps that:
Step one, the determination of trough
The deep basal pit horizontal shore (1) to be torn open provided according to deep basal pit inner support beam design drawing and the structure for enclosing purlin (2) And its size, as depicted in figs. 1 and 2, trough (3) is provided with purlin (2) upper surface is enclosed.
As depicted in figs. 1 and 2, the trough (3) is rectangle, and the length B of trough (3) is to enclose purlin (2) and level branch Support the horizontal length of beam (1) joint face, i.e. the length B=2200mm of trough (3);One side long of trough (3) with enclose purlin (2) overlapped with the connection side of horizontal shore (1), the width of trough (3) is A '
A '=0.3~0.4A (1)
In formula (1):A represents the width for enclosing purlin (2), mm.
By:A=1200mm;
Then:A '=360~480mm.
The setting of step 2, pre-buried pvc pipe (4)
As depicted in figs. 1 and 2, pre-buried pvc pipe (4) is set in the trough (3);Pre-buried pvc pipe (4) is 2 rows, described The distance for closing on side long respective with trough is 90~100mm to the pre-buried pvc pipe of two rows (4) respectively.The array pitch a=200 for often arranging ~230mm, pitch-row b=140~150mm.The cloth of the pre-buried pvc pipe (3) buries mode in quincunx, as shown in figure 3, pre-buried Pvc pipe (4) is perpendicular to trough (3).
The fixation of step 3, pre-buried pvc pipe (4)
Before foundation pit reinforced concrete support beam is poured, the first setting of the pre-buried pvc pipe (4) as described in step 2, by institute Pre-buried pvc pipe (4) is stated to be fixed in the trough (3):The lower end of the pre-buried pvc pipe (4) is located at the template bottom for enclosing purlin (2) Portion, the upper end of pre-buried pvc pipe (4) is higher by the upper surface for enclosing purlin (2);Block the upper port of pre-buried pvc pipe (4).
Step 4, casting concrete and the pre-buried pvc pipe (4) of cleaning
During casting concrete, artificial vibrated concrete will avoid pre-buried pvc pipe (4);In demolition blasting deep basal pit level branch Before support beam (1), tamper in the pipe of pre-buried pvc pipe (4) is cleared up.
The specification of the pre-buried pvc pipe (4) is D40;The length of pre-buried pvc pipe (4) is L
L=h+ △ L (2)
In formula (2):H represents the height for enclosing purlin (2) cross section, mm;
△ L represent that pre-buried pvc pipe (4) is higher by the height for enclosing purlin (2), mm;
In the present embodiment:△ L=40~60mm.
By:H=1000, △ L=40~60mm;
Then:L=1040~1060mm.
Embodiment 2
Purlin protection preprocess method is enclosed before a kind of Brace in Deep Footing Groove beam demolition blasting.The present embodiment removes following technical parameters Outward, remaining is with embodiment 1:
In the present embodiment, deep basal pit horizontal shore (1) has heel brace and truss to support, and deep basal pit horizontal shore (1) and encloses The joint face length of purlin (2) is 2500mm;Enclosing the cross sectional dimensions of purlin (2) is:Height h=1400mm, width A=1400mm.
The length B=2200mm of trough described in the present embodiment (3), the width of trough (3) is A '
A '=0.4~0.5A (1)
By:A=1400mm;
Then:A '=560~700mm.
Pre-buried pvc pipe (4) described in the present embodiment is 3~4 rows, and the pre-buried pvc pipe of the row of outside two (4) is respectively with trough each The distance for closing on side long be 80~90mm.Array pitch a=220~the 250mm for often arranging, pitch-row b=150~160mm.
The specification of pre-buried pvc pipe (4) described in the present embodiment is D40;The length of pre-buried pvc pipe (4) is L
L=h+ △ L (2)
In formula (2):H is represented and is enclosed purlin (2) cross-sectional height, h=1400mm;
△ L represent that the upper end of pre-buried pvc pipe (4) is higher by the height for enclosing purlin (2) upper surface, mm;
In the present embodiment:△ L=60~80mm.
By:H=1400mm, △ L=60~80mm;
Then:L=2000~2200mm.
This specific embodiment has following good effect compared with prior art:
This specific embodiment is in horizontal shore (1) and encloses enclosing for purlin (2) junction and set at purlin (2) upper surface reserved Area (3), before reinforced concrete brace is poured, buries mode and pre-buried pvc pipe (4) is arranged in into described reserving using quincunx cloth In area (3), to form air curtain.The preparation method of pre-buried pvc pipe (4) is simple, and the construction period is short, easy construction, can not only Effectively utilize explosive energy, reduce explosive specific charge, and can ensure that in explosion and crushing effect and protection foundation ditch and enclose purlin structure and underground The stability of diaphragm wall, improves the security of surrounding enviroment.
In Brace in Deep Footing Groove girder construction, it is connected with deep basal pit horizontal shore (1) and subterranean wall due to enclosing purlin (2), The explosion wave that deep basal pit horizontal shore (1) is produced in demolition blasting will be directly passed to underground by enclosing purlin (2) Wall, when blast impulse intensity of wave is more than subterranean wall shock wave resistance intensity, subterranean wall will occur destruction and damage.And the air The formation of curtain, can be such that the explosion wave produced during deep basal pit horizontal shore (1) explosion occurs at the air curtain Reflection, so that the energy that blast is produced is fully used, deep basal pit horizontal shore (1) explosion and crushing effect is better It is good;The air curtain effectively blocks the transmission of explosion wave, reduces explosion wave and connects to enclosing purlin (2) and underground The harm of continuous wall, crushing effect is good and economizes on resources.
Therefore, this specific embodiment has that construction cost is low, security is good, the construction period is short, crushing effect good and section About resource the characteristics of.This specific embodiment is applicable not only to the demolition blasting of reinforced concrete brace in foundation ditch, also extensive It is applied to the blasting and dismantling engineerings such as frame construction building, factory building.

Claims (2)

1. purlin protection preprocess method is enclosed before a kind of Brace in Deep Footing Groove beam demolition blasting, it is characterised in that described to enclose purlin protection in advance The step of processing method is:
Step one, the determination of trough
According to deep basal pit inner support beam design drawing provide deep basal pit horizontal shore (1) to be torn open and enclose purlin (2) structure and its Size, trough (3) is provided with purlin (2) upper surface is enclosed;
The trough (3) is rectangle, and the length B of trough (3) is the level for enclosing purlin (2) and horizontal shore (1) joint face Length, one of trough (3) long to overlap while with the connection for enclosing purlin (2) and horizontal shore (1), the width of trough (3) It is A '
A '=0.3~0.5A (1)
In formula (1):A represents the width for enclosing purlin (2), mm;
The setting of step 2, pre-buried pvc pipe (4)
Pre-buried pvc pipe (4) is set in the trough (3), pre-buried pvc pipe (4) is 2~4 rows, the pre-buried pvc pipe of the row of outside two (4) The distance for closing on side long respective with trough is 80~100mm respectively;Array pitch a=200~the 250mm for often arranging, pitch-row b= 140~160mm;It is in quincunx that the cloth of the pre-buried pvc pipe (3) buries mode, and pre-buried pvc pipe (4) is perpendicular to trough (3);
The fixation of step 3, pre-buried pvc pipe (4)
Before foundation pit reinforced concrete support beam is poured, first as described in step 2 pre-buried pvc pipe (4) setting, will be described pre-buried Pvc pipe (4) is fixed in the trough (3):The lower end of the pre-buried pvc pipe (4) is located at the template bottom for enclosing purlin (2), in advance The upper end for burying pvc pipe (4) is higher by the upper surface for enclosing purlin (2), blocks the upper port of pre-buried pvc pipe (4);
Step 4, casting concrete and the pre-buried pvc pipe (4) of cleaning
During casting concrete, artificial vibrated concrete will avoid pre-buried pvc pipe (4);In demolition blasting deep basal pit horizontal shore (1) before, tamper in the pipe of pre-buried pvc pipe (4) is cleared up.
2. purlin protection preprocess method is enclosed before Brace in Deep Footing Groove beam demolition blasting according to claim 1, its feature exists In the pre-buried pvc pipe (4) specification be D40;The length of pre-buried pvc pipe (4) is L
L=h+ △ L (2)
In formula (2):H represents the height for enclosing purlin (2) cross section, mm,
△ L represent that pre-buried pvc pipe (4) is higher by the height for enclosing purlin (2), mm,
△ L=40~80mm.
CN201611168205.6A 2016-12-16 2016-12-16 A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method Expired - Fee Related CN106759526B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109295987A (en) * 2018-10-12 2019-02-01 华汇工程设计集团股份有限公司 A kind of internal support of foundation pit beam that can quickly remove
CN110067581A (en) * 2019-05-13 2019-07-30 湖北工业大学 The arrangement and construction method of trouble or opening armored concrete branch sheath embedded hole are opened in tunnel or tunnel

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109295987A (en) * 2018-10-12 2019-02-01 华汇工程设计集团股份有限公司 A kind of internal support of foundation pit beam that can quickly remove
CN110067581A (en) * 2019-05-13 2019-07-30 湖北工业大学 The arrangement and construction method of trouble or opening armored concrete branch sheath embedded hole are opened in tunnel or tunnel

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