CN101967987A - Construction process for temporarily strengthening tunnel face of underground excavation sand layer - Google Patents
Construction process for temporarily strengthening tunnel face of underground excavation sand layer Download PDFInfo
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- CN101967987A CN101967987A CN2010102824258A CN201010282425A CN101967987A CN 101967987 A CN101967987 A CN 101967987A CN 2010102824258 A CN2010102824258 A CN 2010102824258A CN 201010282425 A CN201010282425 A CN 201010282425A CN 101967987 A CN101967987 A CN 101967987A
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Abstract
The invention relates to a construction process for temporarily strengthening a tunnel face of an underground excavation sand layer, which comprises the following steps: stirring and preparing slurry: taking a liquid sand strengthening agent and cement slurry of which the mixing ratio is 1:0.5, stirring under the condition that the volume ratio of the sand strengthening agent to the cement slurry is 1:0.7 to form cement and sand strengthening agent dual-liquid slurry, and initially setting for 7min; generating high-pressure air by directly utilizing a spraying and mixing air compressor, and controlling the air pressure at 0.5MPa; spraying the slurry: connecting an air pipe to a sealed slurry injecting tank, enabling a slurry spraying pipe which is led out of the bottom of the slurry injecting tank to face the surface of the sand layer, inputting the high-pressure air to spray the slurry in the slurry injecting tank onto the surface of the sand layer through the high-pressure air to further permeate into the sand layer, enabling the slurry spraying pipe to be perpendicular to the surface of the sand layer, keeping the distance between the slurry spraying pipe and the surface of the sand layer at 20cm-40cm, and moving the slurry spraying pipe at uniform speed to connect the sprayed surfaces together; and installing grids. Thus, the invention solves the problems of safety and stability of the tunnel face in the construction of the underground excavation sand layer. The invention has the characteristic of convenient and quick construction, can not affect the excavation construction, and is economical and practical. The invention is suitable for strengthening and stabilizing the tunnel face excavated in the sand layer geology.
Description
Technical field
The present invention relates to a kind of construction technology of interim reinforcing tunneling layer of sand face.
Background technology
In the construction of project dug underground, the excavation face is to construct foremost, also is the weak part of engineering, and most landslide, unstability all occur in the construction face, is the primary problem that solves of tunneling construction so keep the safety and stability of face.The concreteness of sand is poor, particularly the layer of sand water content hour, the core soil bank protection that the excavation face is reserved is also stable inadequately, grid is installed, spray mixes natural layer of sand is produced disturbance, causes that sand constantly is scattered, leaks, and usually causes blank unstability.
The method of reinforcing face commonly used has net pneumatically placed concrete or conduit slip casting at present, be subjected to the restriction of engineering time, these two kinds of methods only adopt when stopping to construct, and generally can not implement to handle to the layer of sand of face in the normal construction process, have stayed potential safety hazard.
Summary of the invention
Its purpose of the present invention just is to provide a kind of construction technology of interim reinforcing tunneling layer of sand face, has easy construction, characteristics efficiently, does not influence excavation construction, and economic, practical.
The technical scheme that realizes above-mentioned purpose and take comprises that slurries mix system, adopts liquid sand-fixating agent and cement paste, and the match ratio of cement paste is 1: 0.5, stirs, and the volume ratio of sand-fixating agent and cement paste is 1: 0.7, forms cement sand-fixating agent biliquid slurry, initial setting time 7min; High-pressure blast, directly the air compressor machine that utilizes spray to mix gets final product, and blast is controlled at 0.5MPa; Spray slurries, airduct is switched to airtight slip casting jar, the shotcrete pipe of drawing from the slip casting pot bottom is towards the layer of sand surface, the input high-pressure blast can be ejected into the layer of sand surface by high-pressure blast with the slurries in the slip casting jar, and to internal penetration, shotcrete pipe keeps the distance of 20cm～40cm perpendicular to the layer of sand surface, at the uniform velocity mobile shotcrete pipe joins together jet face; Grid is installed, grid is installed subsequently, set slip casting ductule, a spray just is mixed and can be effectively protected.
Compared with prior art, beneficial effect of the present invention is,
Facts have proved, adopt the two slurries of cement sand-fixating agent to spray and reinforce the face layer of sand:
(1) overcome the difficult problem that the face in the excavation construction is reinforced, the good penetrability of slurries, form the duricrust of one deck 2cm～4cm on the layer of sand surface, effectively prevent loose sand fall certainly and general construction disturbance under slump, reinforce layer of sand excavation face and vault by ring, eliminate the influence of construction disturbance, stablize surface layer, prevent to leak;
(2) easy construction, quick, disturbance is little, easily causes collapsing of sand bed as setting grouting pipe on the face that tilts, installation and spray to excavation and bow member mix not influence, substantially do not take the normal engineering time, implement the reinforcing on surface by high-pressure injection, simple, effective;
(3) to be melted into the duricrust intensity that sand forms low, manually promptly dismountable for cement sand-fixating agent slurries, do not influence excavation construction, forms the continuous duricrust of one deck at the sand surface layer, on layer of sand, combines together with layer of sand, need not to carry out anchoring by other member;
(4) than net spray and conduit slip casting economy, easily and fast, practicality.
The specific embodiment
Comprise
1) slurries are mixed system
Adopt liquid sand-fixating agent and cement paste, the match ratio of cement paste is 1: 0.5, stirs, and the volume ratio of sand-fixating agent and cement paste is 1: 0.7, forms cement sand-fixating agent biliquid slurry, initial setting time 7min;
2) high-pressure blast
Directly the air compressor machine that utilizes spray to mix gets final product, and blast is controlled at 0.5MPa;
3) spray slurries
Airduct is switched to airtight slip casting jar, the shotcrete pipe of drawing from the slip casting pot bottom is towards the layer of sand surface, the input high-pressure blast can be ejected into the layer of sand surface by high-pressure blast with the slurries in the slip casting jar, and to internal penetration, shotcrete pipe is perpendicular to the layer of sand surface, keep the distance of 20cm～40cm, at the uniform velocity mobile shotcrete pipe joins together jet face;
4) grid is installed
Grid is installed subsequently, is set slip casting ductule, a spray just is mixed and can be effectively protected.
The present invention adopts fixed slurries, exposed sand face enforcement is sprayed to excavation face and arch, can form one deck duricrust on the layer of sand surface fast, has eliminated the layer of sand leakage that the construction disturbance causes, keep the stable of chiltern face, had very high practical value.
Technology is described in detail
1, slurries are mixed system
Adopt liquid sand-fixating agent and cement paste (match ratio of cement paste is 1: 0.5) to stir, the volume ratio of sand-fixating agent and cement paste is 1: 0.7, forms cement sand-fixating agent biliquid slurry, because slurries have the characteristic of rapid solidification, so will be with mixing with notes.Initial setting time 7min.
2, high-pressure blast
Directly the air compressor machine that utilizes spray to mix gets final product, and blast is controlled at 0.5MPa.
3, spray slurries
Airduct is switched to airtight slip casting jar, and the shotcrete pipe of drawing from the slip casting pot bottom is towards the layer of sand surface, and the input high-pressure blast can be ejected into the layer of sand surface by high-pressure blast with the slurries in the slip casting jar, and to internal penetration.Shotcrete pipe keeps the distance of 20cm～40cm perpendicular to the layer of sand surface, and at the uniform velocity mobile shotcrete pipe joins together jet face.
4, effect detection
The setting time of the two slurries of cement sand-fixating agent is 7min, can form a back-up coat on the layer of sand surface after injection is finished.
Spray one-shot forming, can not spray again, fill spray and cause disturbance.
Embodiment
No. two line station owners of certain subway body tunneling section is positioned at railway below, vault buried depth 6.4m, two-way 8 tracks, stop, heavy traffic, underground 12 of the pipelines such as plumbing, electric power, coal gas, communication that are embedded with.The following 4m in road surface～6m scope is a backfill, is downwards fine sand, medium coarse sand, and vault and face are positioned at the fine sand scope substantially.Because layer of sand is positioned at more than the waterline, water content is low, is loose shape, and being subjected to extraneous slight disturbance all can slump.
During mixing, keep stablizing of face layer of sand in installation bow member and spray, decision is to exposed layer of sand jet surface cement sand-fixating agent slurry, the sand that the surface is loose is consolidated into one deck duricrust, prevents that loose sand is scattered under the disturbance of construction and ground driving and continuous expansion forms landslide.
Construction process and technology are as follows:
(1) airduct, grout mixer and slip casting jar and cement, sand-fixating agent leave the job site in, implement immediately to spray after each circulation excavation finishes and reinforce face and vault;
(2) pour the cement sand-fixating agent mixed pulp that stirs into the slip casting jar;
(3) high-pressure blast is inserted the slip casting jar, open shotcrete pipe, whitewash towards the sand face;
(4) grid is installed subsequently, is set slip casting ductule, a spray just mixes to wait and all can effectively be protected.
Claims (1)
1. an interim construction technology of reinforcing tunneling layer of sand face is characterized in that, comprises
1) slurries are mixed system
Adopt liquid sand-fixating agent and cement paste, the match ratio of cement paste is 1: 0.5, stirs, and the volume ratio of sand-fixating agent and cement paste is 1: 0.7, forms cement sand-fixating agent biliquid slurry, initial setting time 7min;
2) high-pressure blast
Directly the air compressor machine that utilizes spray to mix gets final product, and blast is controlled at 0.5MPa;
3) spray slurries
Airduct is switched to airtight slip casting jar, the shotcrete pipe of drawing from the slip casting pot bottom is towards the layer of sand surface, the input high-pressure blast can be ejected into the layer of sand surface by high-pressure blast with the slurries in the slip casting jar, and to internal penetration, shotcrete pipe is perpendicular to the layer of sand surface, keep the distance of 20cm～40cm, at the uniform velocity mobile shotcrete pipe joins together jet face;
4) grid is installed
Grid is installed subsequently, is set slip casting ductule, a spray just is mixed and can be effectively protected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102824258A CN101967987A (en) | 2010-09-15 | 2010-09-15 | Construction process for temporarily strengthening tunnel face of underground excavation sand layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102824258A CN101967987A (en) | 2010-09-15 | 2010-09-15 | Construction process for temporarily strengthening tunnel face of underground excavation sand layer |
Publications (1)
| Publication Number | Publication Date |
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| CN101967987A true CN101967987A (en) | 2011-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2010102824258A Pending CN101967987A (en) | 2010-09-15 | 2010-09-15 | Construction process for temporarily strengthening tunnel face of underground excavation sand layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334772A (en) * | 2013-07-08 | 2013-10-02 | 中铁十四局集团有限公司 | Slurry capable of stabilizing tunnel face of underground excavation sand layer, slurry preparation method, grouting equipment and grouting process |
| CN108875152A (en) * | 2018-05-28 | 2018-11-23 | 湖南科技大学 | A kind of tunnel tunnel face calculating method for stability considering penetration |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000337077A (en) * | 1999-05-26 | 2000-12-05 | Ohbayashi Corp | Method for constructing tunnel |
| JP2008138385A (en) * | 2006-11-30 | 2008-06-19 | Shimizu Corp | Tunnel construction method |
| CN101358529A (en) * | 2008-08-19 | 2009-02-04 | 中铁四局集团第五工程有限公司 | Short tube and short tube sand consolidation agent strengthening construction process |
| KR20100004936A (en) * | 2007-03-23 | 2010-01-13 | 미쓰비시덴키 가부시키가이샤 | Elevator control system |
| CN101769157A (en) * | 2010-01-21 | 2010-07-07 | 广东省长大公路工程有限公司 | Construction method for tunnel working face counterpressure treatment during tunnel excavation |
-
2010
- 2010-09-15 CN CN2010102824258A patent/CN101967987A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000337077A (en) * | 1999-05-26 | 2000-12-05 | Ohbayashi Corp | Method for constructing tunnel |
| JP2008138385A (en) * | 2006-11-30 | 2008-06-19 | Shimizu Corp | Tunnel construction method |
| KR20100004936A (en) * | 2007-03-23 | 2010-01-13 | 미쓰비시덴키 가부시키가이샤 | Elevator control system |
| CN101358529A (en) * | 2008-08-19 | 2009-02-04 | 中铁四局集团第五工程有限公司 | Short tube and short tube sand consolidation agent strengthening construction process |
| CN101769157A (en) * | 2010-01-21 | 2010-07-07 | 广东省长大公路工程有限公司 | Construction method for tunnel working face counterpressure treatment during tunnel excavation |
Non-Patent Citations (1)
| Title |
|---|
| 刘庆伟，王旭光: "采取综合措施使隧道通过砂夹卵石不稳定地层", 《铁道建筑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334772A (en) * | 2013-07-08 | 2013-10-02 | 中铁十四局集团有限公司 | Slurry capable of stabilizing tunnel face of underground excavation sand layer, slurry preparation method, grouting equipment and grouting process |
| CN108875152A (en) * | 2018-05-28 | 2018-11-23 | 湖南科技大学 | A kind of tunnel tunnel face calculating method for stability considering penetration |
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Application publication date: 20110209 |