CN106759526B - A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method - Google Patents
A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method Download PDFInfo
- Publication number
- CN106759526B CN106759526B CN201611168205.6A CN201611168205A CN106759526B CN 106759526 B CN106759526 B CN 106759526B CN 201611168205 A CN201611168205 A CN 201611168205A CN 106759526 B CN106759526 B CN 106759526B
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- China
- Prior art keywords
- pvc pipe
- purlin
- buried pvc
- trough
- buried
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
Abstract
The present invention relates to the purlins before a kind of Brace in Deep Footing Groove beam demolition blasting to protect preprocess method.Its technical solution is：It is equipped with rectangle trough (3) in purlin (2) upper surface, the length B of trough (3) is the horizontal length of purlin (2) and horizontal shore (1) joint face, and the long side of trough (3) one is overlapped with the connection side of purlin (2) and horizontal shore (1).In trough (3) the setting pre-buried pvc pipe of 2~4 rows (4), array pitch a=200~250mm, pitch-row b=140~160mm are often arranged.It is in quincunx that the cloth of the pre-buried pvc pipe (4), which buries mode, and pre-buried pvc pipe (4) is perpendicular to trough (3).Before foundation pit reinforced concrete supporting beam pours, 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 of purlin (2), and the upper end of pre-buried pvc pipe (4) is higher by 40~80mm of upper surface of purlin (2).The present invention has the characteristics that construction cost is low, safety is good, the construction period is short, crushing effect is good and economizes on resources.
Description
Technical field
The invention belongs to Brace in Deep Footing Groove beam Blasting Demolition Technology fields.More particularly to a kind of Brace in Deep Footing Groove beam explosion is torn open
Purlin before removing protects preprocess method.
Background technology：
With the continuous development of Process of Urbanization Construction, various large deep foundation pits also increase therewith, the reinforced concrete in deep basal pit
The dismounting amount of native supporting beam (abbreviation Brace in Deep Footing Groove beam) gradually increases.Deep basal pit inner support beam demolition blasting method, which 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 Brace in Deep Footing Groove
Beam is removed, and is most widely used.
The problem of shotfiring safety is 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., cannot generate destruction to it in demolition blasting, as subterranean wall needs in construction in later period
It is continuing with, therefore, the safety problem for considering subterranean wall is had to before demolition blasting.In structure, due to purlin and underground
Wall is connected, and the explosion wave that Brace in Deep Footing Groove beam is generated in explosion will be directly passed to subterranean wall by purlin, when
When blast impulse intensity of wave is more than subterranean wall shock wave resistance intensity, subterranean wall will occur to destroy damage.
Currently, when carrying out demolition blasting construction to Brace in Deep Footing Groove beam, to ensure that foundation pit supporting construction and surrounding are built
The stability of object is built, often uses the method for reducing explosive payload in blasting process, this method to influence explosion and crushing effect, extends
Duration, improve dismounting cost.
Invention content
The present invention is directed to overcome prior art defect.Be designed to provide a kind of construction cost is low, safety is good, construction work
The preprocess method of the protection purlin for the Brace in Deep Footing Groove beam demolition blasting that 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 comprises the concrete steps that：
Step 1: the determination of trough
According to the structure and its ruler of deep basal pit horizontal shore to be torn open and purlin that deep basal pit inner support beam design drawing provides
It is very little, it is equipped with trough in purlin upper surface.
The trough is rectangle, and the length B of trough is the horizontal length of purlin and horizontal shore joint face, is reserved
One long side in area is overlapped with the connection side of purlin and horizontal shore, and the width of trough is A '
'=0.3 A~0.5A (1)
In formula (1)：A indicates the width of purlin, mm.
Step 2: the setting of pre-buried pvc pipe
In the trough, pre-buried pvc pipe is set；Pre-buried pvc pipe is 2~4 rows, the two rows of pre-buried pvc pipes in outside respectively in advance
It is 80~100mm to stay the respective distance for closing on long side in area.Array pitch a=200~the 250mm often arranged, pitch-row b=140~
160mm.It is in quincunx that the cloth of the pre-buried pvc pipe, which buries mode, and pre-buried pvc pipe is perpendicular to trough.
Step 3: the fixation of pre-buried pvc pipe
Before foundation pit reinforced concrete supporting beam pours, the setting of pre-buried pvc pipe described in step 2 is first pressed, it will be described pre-buried
Pvc pipe is fixed in the trough：The lower end of the pre-buried pvc pipe is located at the template bottom of purlin, the upper end of pre-buried pvc pipe
It is higher by the upper surface of purlin；Block the upper port of pre-buried pvc pipe.
Step 4: casting concrete and the pre-buried pvc pipe of cleaning
When casting concrete, artificial vibrated concrete will avoid pre-buried pvc pipe；In demolition blasting deep basal pit horizontal shore
Before, clear up tamper in the pipe of pre-buried pvc pipe.
The specification of the pre-buried pvc pipe is D40；The length of pre-buried pvc pipe is L
L=h+ Δs L (2)
In formula (2)：H indicates the height of purlin cross section, mm；
Δ L indicates that pre-buried pvc pipe is higher by the height of purlin, mm；
Δ L=40~80mm.
Due to the adoption of the above technical scheme, the present invention has following good effect compared with prior art：
Trough is arranged in the present invention at the purlin upper surface of horizontal shore and purlin junction, in armored concrete branch
Before support beam pours, mode is buried using quincunx cloth, pre-buried pvc pipe is arranged in the trough, to form air curtain.In advance
The production method for burying pvc pipe is simple, and the construction period is short, easy for construction, can not only efficiently use explosive energy, reduces explosive list
Consumption, and can ensure that purlin structure and the stability of diaphram wall in explosion and crushing effect and protection foundation pit, improve peripheral ring
The safety in border.
In Brace in Deep Footing Groove girder construction, since purlin is connected with deep basal pit horizontal shore and subterranean wall, deep basal pit
The explosion wave that horizontal shore is generated in demolition blasting will be directly passed to subterranean wall by purlin, work as blast impulse
When intensity of wave is more than subterranean wall shock wave resistance intensity, subterranean wall will occur to destroy damage.And the formation of the air curtain, meeting
The explosion wave generated when deep basal pit horizontal shore explosion is set to be reflected at the air curtain, to make explosion produce
Raw energy is fully used, and deep basal pit horizontal shore explosion and crushing effect is better；The air curtain is effectively
The transmission for blocking explosion wave, reduces harm of the explosion wave to purlin and diaphram wall, crushing effect it is good and
It economizes on resources.
Therefore, the present invention has that construction cost is low, safety is good, the construction period is short, crushing effect is good and economizes on resources
Feature.The present invention is applicable not only to the demolition blasting of reinforced concrete brace in foundation pit, is also widely used for frame structure building
The blasting and dismantling engineerings such as room, workshop.
Description of the drawings
Fig. 1 is that a kind of of the present invention applies stereoscopic schematic diagram；
Fig. 2 is the top plan view of Fig. 1；
Fig. 3 is the C-C schematic cross-sectional views of Fig. 2.
Specific implementation mode
The invention will be further described With reference to embodiment, not to the limitation of its protection domain.
Embodiment 1
A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method.In the present embodiment, deep basal pit is horizontal
Supporting beam 1 has heel brace and truss to support, and the joint face length of deep basal pit horizontal shore 1 and purlin 2 is 2200mm；The cross of purlin 2
Sectional dimension is：Height h=1000mm, width A=1200mm.
The technical solution that the present embodiment uses comprises the concrete steps that：
Step 1: 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 purlin 2 structure and its
Size is equipped with trough 3 in 2 upper surface of purlin as depicted in figs. 1 and 2.
As depicted in figs. 1 and 2, the trough 3 is rectangle, and the length B of trough 3 is that purlin 2 connects with horizontal shore 1
The horizontal length of junction, i.e. the length B=2200mm of trough 3；One long side of trough 3 and purlin 2 and horizontal shore 1
Connection side overlap, the width of trough 3 is A '
'=0.3 A~0.4A (1)
In formula (1)：A indicates the width of purlin 2, mm.
By：A=1200mm；
Then：'=360 A~480mm.
Step 2: the setting of 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 two rows of pre-
It is respectively 90~100mm with respective close at a distance from long side in trough to bury pvc pipe 4.Array pitch a=200~the 230mm often arranged,
Pitch-row b=140~150mm.The cloth of the pre-buried pvc pipe 4 buries mode in quincunx, as shown in figure 3, pre-buried pvc pipe 4 perpendicular to
Trough 3.
Step 3: the fixation of pre-buried pvc pipe 4
Before foundation pit reinforced concrete supporting beam pours, the setting of the pre-buried pvc pipe 4 described in step 2 is first pressed, it 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 of purlin 2, pre-buried PVC
The upper end of pipe 4 is higher by the upper surface of purlin 2；Block the upper port of pre-buried pvc pipe 4.
Step 4: casting concrete and clearing up pre-buried pvc pipe 4
When casting concrete, artificial vibrated concrete will avoid pre-buried pvc pipe 4；It is horizontally-supported in demolition blasting deep basal pit
Before 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+ Δs L (2)
In formula (2)：H indicates the height of 2 cross section of purlin, mm；
Δ L indicates that pre-buried pvc pipe 4 is higher by the height of purlin 2, mm；
In the present embodiment：Δ L=40~60mm.
By：H=1000, Δ L=40~60mm；
Then：L=1040~1060mm.
Embodiment 2
A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method.The present embodiment removes following technical parameters
Outside, remaining is the same as embodiment 1：
In the present embodiment, deep basal pit horizontal shore 1 has heel brace and truss support, deep basal pit horizontal shore 1 and purlin 2
Joint face length is 2500mm；The cross sectional dimensions of purlin 2 is：Height h=1400mm, width A=1400mm.
The width of the length B=2200mm of trough 3 described in the present embodiment, trough 3 are A '
'=0.4 A~0.5A (1)
By：A=1400mm；
Then：'=560 A~700mm.
Pre-buried pvc pipe 4 described in the present embodiment is 3~4 rows, the two rows of pre-buried pvc pipe in outside 4 respectively with trough is respective faces
The distance of nearly long side is 80~90mm.Array pitch a=220~the 250mm often arranged, 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+ Δs L (2)
In formula (2)：H indicates 2 cross-sectional height of purlin, h=1400mm；
Δ L indicates that the upper end of pre-buried pvc pipe 4 is higher by the height of 2 upper surface of purlin, mm；
In the present embodiment：Δ L=60~80mm.
By：H=1400mm, Δ L=60~80mm；
Then：L=2000~2200mm.
Present embodiment has following good effect compared with prior art：
Trough 3 is arranged in present embodiment at 2 upper surface of purlin of 2 junction of horizontal shore 1 and purlin,
Before reinforced concrete brace pours, mode is buried using quincunx cloth, pre-buried pvc pipe 4 is arranged in the trough 3, with shape
At air curtain.The production method of pre-buried pvc pipe 4 is simple, and the construction period is short, easy for construction, can not only efficiently use explosive energy
Amount reduces explosive specific charge, and can ensure that purlin structure and the stability of diaphram wall in explosion and crushing effect and protection foundation pit,
Improve the safety of surrounding enviroment.
In Brace in Deep Footing Groove girder construction, since purlin 2 is connected with deep basal pit horizontal shore 1 and subterranean wall, deep base
The explosion wave that hole horizontal shore 1 is generated in demolition blasting will be directly passed to subterranean wall by purlin 2, work as explosion
When shock strength is more than subterranean wall shock wave resistance intensity, subterranean wall will occur to destroy damage.And the shape of the air curtain
At the explosion wave generated when deep basal pit 1 explosion of horizontal shore being made to be reflected at the air curtain, to make
The energy that explosion generates is fully used, and 1 explosion and crushing effect of deep basal pit horizontal shore is better；The air curtain
The transmission for effectively blocking explosion wave reduces harm of the explosion wave to purlin 2 and diaphram wall, is crushed effect
Fruit is good and economizes on resources.
Therefore, present embodiment is with construction cost is low, safety is good, the construction period is short, crushing effect is good and section
About resource the characteristics of.Present embodiment is applicable not only to the demolition blasting of reinforced concrete brace in foundation pit, also extensive
Applied to blasting and dismantling engineerings such as frame construction building, workshops.
Claims (2)
1. the purlin before a kind of Brace in Deep Footing Groove beam demolition blasting protects preprocess method, it is characterised in that the purlin protection is pre-
The step of processing method is：
Step 1: 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 purlin (2) structure and its
Size is equipped with trough (3) in purlin (2) upper surface；
The trough (3) is rectangle, and the length B of trough (3) is the level of purlin (2) and horizontal shore (1) joint face
One long side of length, trough (3) is overlapped with the connection side of purlin (2) and horizontal shore (1), the width of trough (3)
For A '
'=0.3 A~0.5A (1)
In formula (1)：A indicates the width of purlin (2), mm；
Step 2: the setting of 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 two rows of pre-buried pvc pipes (4) in outside
Respective close at a distance from long side is 80~100mm with trough respectively；Array pitch a=200~the 250mm often arranged, pitch-row b=
140~160mm；It is in quincunx that the cloth of the pre-buried pvc pipe (4), which buries mode, and pre-buried pvc pipe (4) is perpendicular to trough (3)；
Step 3: the fixation of pre-buried pvc pipe (4)
Before foundation pit reinforced concrete supporting beam pours, the setting of pre-buried pvc pipe (4) described in step 2 is first pressed, it 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 of purlin (2), in advance
The upper end for burying pvc pipe (4) is higher by the upper surface of 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
When 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. the purlin before Brace in Deep Footing Groove beam demolition blasting according to claim 1 protects preprocess method, feature to exist
In the pre-buried pvc pipe (4) specification be D40；The length of pre-buried pvc pipe (4) is L
L=h+ Δs L (2)
In formula (2)：The height of h expressions purlin (2) cross section, mm,
Δ L indicates that pre-buried pvc pipe (4) is higher by the height of purlin (2), mm,
Δ L=40~80mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611168205.6A CN106759526B (en) | 2016-12-16 | 2016-12-16 | A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611168205.6A CN106759526B (en) | 2016-12-16 | 2016-12-16 | A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method |
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| CN106759526A CN106759526A (en) | 2017-05-31 |
| CN106759526B true CN106759526B (en) | 2018-10-26 |
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| CN201611168205.6A Expired - Fee Related CN106759526B (en) | 2016-12-16 | 2016-12-16 | A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method |
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| 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 |
| CN110067581B (en) * | 2019-05-13 | 2020-10-02 | 湖北工业大学 | Arrangement mode and construction method of reinforced concrete support layer pre-buried holes at turnout or opening of tunnel or roadway |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3062133B2 (en) * | 1997-09-17 | 2000-07-10 | ドンスー シム | Rock cutting method using tensile fracture |
| CN105155553B (en) * | 2015-09-09 | 2017-07-28 | 杭州江润科技有限公司 | Concrete support Static crushing combines green Demolition Construction method with split the law |
| CN105823386B (en) * | 2016-06-03 | 2017-06-09 | 武汉科技大学 | The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch |
| CN105973082B (en) * | 2016-06-03 | 2017-10-03 | 武汉科技大学 | The bore distribution method of reinforced concrete brace demolition blasting in a kind of foundation ditch |
| CN106049503B (en) * | 2016-06-06 | 2017-11-10 | 武汉科技大学 | The preprocess method of reinforced concrete brace demolition blasting in a kind of foundation ditch |
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Granted publication date: 20181026 Termination date: 20201216 |