CN109695454A - The construction method of preliminary bracing is carried out in the constructing tunnel of high earthquake zone fracture area - Google Patents
The construction method of preliminary bracing is carried out in the constructing tunnel of high earthquake zone fracture area Download PDFInfo
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- CN109695454A CN109695454A CN201910075700.XA CN201910075700A CN109695454A CN 109695454 A CN109695454 A CN 109695454A CN 201910075700 A CN201910075700 A CN 201910075700A CN 109695454 A CN109695454 A CN 109695454A
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
Abstract
The invention discloses the construction methods that preliminary bracing is carried out in a kind of high earthquake zone fracture area constructing tunnel, comprising the following steps: one, rock stratum detection, two, underground water detection, three, tunnel excavation, four, top protection, five, integer support.The rubble of tunnel inner wall is first carried out closing protection by protective net by the present invention, it is fixed again by I-steel and arch steel structure, when being fixed using steelframe can the country rock to tunnel inner wall comprehensively closed, therefore, hereafter carry out the case where rubble is fallen from concrete would not occur when gunite concrete step again, not only facilitate carry out constructing tunnel, but also improve the safety of constructing tunnel.
Description
Technical field
The present invention relates to technical field of tunnel construction, more particularly to a kind of high earthquake zone fracture area constructing tunnel
The middle construction method for carrying out preliminary bracing.
Background technique
When carrying out boring construction using Mining Method, surrounding rock supporting is generally divided into preliminary bracing and secondary lining, secondary lining
Usually concrete or reinforced concrete structure.Before secondary lining applies, after just excavating, the support form that carries out immediately
Referred to as preliminary bracing.Preliminary bracing increases structure safety to discharge and deforming in right amount for control surrouding rock stress after tunnel excavation
It spends and facilitates construction, apply that rigidity is smaller and structure sheaf as permanent bearing structure a part immediately, generally there is injection coagulation
Soil, gunite concrete add the forms such as anchor pole, gunite concrete anchor pole and steelframe combined supporting.
But there are some drawbacks in use in traditional preliminary bracing, and such as: traditional preliminary bracing is general only
Need to carry out gunite concrete after tunnel excavation, or using anchor pole and steelframe to some biggish rocks loosened into
One simple supporting of row, but this method is suitable only for the more stable situation use of rock property, on some highlands
When shake band fracture area carries out preliminary bracing, since this area is in earthquake zone, tunnel surrounding medium stone is more, if using
Gunite concrete carries out preliminary bracing, is easy the rubble when the concrete of injection does not solidify also and has fallen；If using anchor pole
Comprehensive supporting, therefore existing initial stage branch can not also be carried out at this time since cofferdam medium stone is excessive by carrying out supporting with steelframe
Maintaining method is not particularly suited for the tunnel surrounding supporting of high earthquake zone fracture area.
Therefore, how to overcome defect in the prior art, a kind of tunnel suitable for high earthquake zone fracture area is provided to enclose
Petrous branch shield, the problem of becoming for those skilled in the art's urgent need to resolve.
Summary of the invention
In view of this, the present invention provides the construction parties for carrying out preliminary bracing in a kind of high earthquake zone fracture area constructing tunnel
Method.
To achieve the goals above, the present invention adopts the following technical scheme:
The construction method of preliminary bracing is carried out in a kind of high earthquake zone fracture area constructing tunnel, comprising the following steps:
S100, rock stratum detection: drill hole sampling detection is carried out in tunnel surrounding rock to be excavated, and to rock interior rock
Layer is made a concrete analysis of；
S200, underground water detection: using water detection appratus to the underground water in rock stratum there are situations to detect, and
The area of the underground water source detected, flow direction, spatial position are detected in detail；
S300, tunnel excavation: after the detection and analysis of step S100 and step S200, selection rock property preferably and
There is no the region of underground water to excavate tunnel, tunnel excavation method stays core local method or seven step steps using Ring Cutting
Method；
S400, top protection: the Ring Cutting used in step S300 stay core local method or seven step benching tunnelling methods be intended to from
Tunnel top starts to excavate, and after the completion of excavating tunnel top, Yao Jinhang top shield, steps are as follows for Specific construction:
S401, protective net is laid in tunnel top inner wall；
S402, anchor hole is stamped on the country rock of tunnel top inner wall；
S403, along tunnel direction of travel equidistant laying I-steel parallel to each other；
S404, I-steel is fixed on inside anchor hole using anchor pole；
S500, integer support: core local method or seven step benching tunnelling methods are stayed all to dig entire tunnel cross-section using Ring Cutting
After opening, then integer support is carried out, steps are as follows for Specific construction:
S501, anchor hole is stamped on the country rock of tunnel side inner walls；
S502, protective net is laid in tunnel side inner walls；
S503, along tunnel direction of travel equidistant laying I-steel parallel to each other；
S504, I-steel is fixed on inside anchor hole using anchor pole；
S505, it is supported using I-steel of the arch steel structure to all inner walls in tunnel；
S506, all inner walls in tunnel progress gunning concrete is fixed.
The rubble of tunnel inner wall is first carried out closing protection by protective net by the present invention, then by I-steel and arch steel structure into
Row fix, when being fixed using steelframe can the country rock to tunnel inner wall comprehensively closed, therefore, hereafter
It carries out the case where rubble is fallen from concrete would not occur when gunite concrete step again, has both facilitated carry out constructing tunnel,
The safety of constructing tunnel is improved again.
Further, based on the above technical solution, the present invention can also be improved as follows:
Preferably, in the step S100, when carrying out drill hole sampling detection, the spacing that tube sample boring opens up is 2 meters -5 meters,
And it is in grid arrangement that tube sample boring, which is 2 meters -5 meters with spacing in tunnel upper to be excavated,；The region overlay of drill hole sampling is opened
Region locating for the tunnel of digging enables the rock stratum of tunnel perimeter comprehensively to be sampled, and rock stratum is adequately visited in guarantee
It surveys.
It preferably,, need to be by the rock taken out from drilling hole successively when carrying out drill hole sampling detection in the step S100
It removes, and rock is placed into marshalling in a reservoir, keep the rock sample taken out completely continuous.
The utility model has the advantages that being mostly detritus inside rock stratum, only collecting drilling because tunnel is provided with high earthquake zone fracture area
The continuity that rock sample is kept when the rock sample of taking-up, just can enable rock sample completely reflect rock interior rock stratum
The case where.
Preferably, in the step S200, when carrying out underground water detection, if there are undergrounds in tunnel excavation region for discovery
Water then according to the water size of underground water and judges whether the underground water is underground underground river, if the underground water water less and
It is not underground underground river, then is solved by way of carrying out extracting discharge to the underground water；If the underground water water is larger or should
Underground water is underground underground river, then needs to be modified to avoid underground water at this to the path in tunnel.
The utility model has the advantages that can effectively avoid the groundwater recharge in construction only local into tunnel internal for above-mentioned technical proposal
After lower water finder carries out detailed detection to tunnel excavation region, do not find that there are underground water in tunnel excavation region,
It can directly be excavated.
Preferably, in the step S300, Ring Cutting stays the tunnel excavation method of core local method are as follows: first to tunnel top
Portion is excavated, and is then excavated respectively to the tunnel side Liang Ge, and the rock at last middle part is cleared up by equipment；Seven step platforms
The tunnel excavation method of rank method are as follows: tunnel top is excavated first, two successively then are carried out to the tunnel side Liang Ge respectively
The rock at middle part is finally divided three layers and cleared up respectively by secondary excavation.
The utility model has the advantages that above two digging mode is all local excavation when excavating, be conducive to when excavating in time to tunnel
Road inner wall carries out supporting, and country rock rubble is avoided to collapse.
It preferably,, need to be first using support rod to protection when tunnel top inner wall is laid with protective net in the step S401
Net is supported, and is then carried out anchor hole again and is opened up.
Preferably, the anchor hole in the step S402 and step S501, which needs to throw hole into hard when opening up, encloses
Inside rock, guarantee that anchor pole can be fixed in country rock.
Preferably, in the step S403 and step S503, the laying spacing between two I-steel parallel to each other is
40-60 centimetres.
Preferably, in the step S404 and step S504, the tool that is fixed on I-steel using anchor pole inside anchor hole
Body step are as follows: first anchor pole is inserted in anchor hole, then is perfused made of quick hardening cement in the gap among anchor pole and anchor hole
Anchor pole is finally fixed on inside anchor hole using cement slurry by cement slurry.
Preferably, in the step S403 and step S503, I-steel when being laid with along tunnel direction of travel, by
In tunnel be sublevel drive, therefore I-steel be by one section one section respectively splicing be laid with, and need to weld between every section of I-steel
Being connected together makes I-steel form an entirety.
Preferably, it in the step S505, is supported, is had using I-steel of the arch steel structure to all inner walls in tunnel
Body are as follows: arch steel structure is first divided into several segments, during installation from tunnel top using the mounting means of splicing by arch steel structure
Start to install, every section of splicing is mounted on I-steel respectively, finally each section of arch steel structure is welded together, makes arch steel
Structure forms an entirety.
By using above-mentioned technical proposal, preliminary bracing is carried out in a kind of high earthquake zone fracture area constructing tunnel of the present invention
Construction method has the beneficial effect that
1, the present invention high earthquake zone fracture area carry out constructing tunnel when, first to the lithology of constructing tunnel region rock into
Row deep drilling sample detection, while also the underground hydrological situation in constructing tunnel region is explored, final choice rock is strong
The broken not serious, rock strength of degree is higher and region of not underground water carries out constructing tunnel, avoids the underground in construction
Water is poured into tunnel internal, ensure that the safety of construction in later period.
2, the present invention selects Ring Cutting that core local method or seven step benching tunnelling methods is stayed to construct in construction, can accelerate
The construction speed in tunnel and the safety for improving constructing tunnel.
3, the present invention timely uses protective net during tunnel excavation and blocks to tunnel inner wall, while using support
Bar is supported protective net, and the rubble that can be avoided in the country rock of tunnel inner wall is fallen, and improves the safety of constructing tunnel.
4, the present invention is then passed through protective net after being supported using protective net and lays anchor hole on the country rock of tunnel inner wall, and
I-steel and protective net are also secured to tunnel inner wall using anchor pole, protective net is fixed using I-steel, finally again
Jack-up is supported to I-steel using arch steel structure, realizes the closed allround to tunnel inner wall country rock, then in tunnel
It is just not in the case where rubble is fallen from concrete that gunite concrete, which is fixed, on wall, substantially increases work progress
Convenience and safety.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment:
The present invention provides the construction method that preliminary bracing is carried out in a kind of high earthquake zone fracture area constructing tunnel, this method
Specifically includes the following steps:
S100, rock stratum detection: drill hole sampling detection is carried out in tunnel surrounding rock to be excavated, and to rock interior rock
Layer is made a concrete analysis of；
Specifically, in above-mentioned steps S100, firstly, being drilled in tunnel surrounding rock to be excavated using probing method
Sampling detection, the drilling depth that when sampling drills need to reach inside the rock stratum at tunnel excavation, and need to be to rock when drill hole sampling
The lithology of layer is analyzed；Secondly, the spacing that tube sample boring opens up is 2-5 meters, and tube sample boring when carrying out drill hole sampling detection
It with spacing is 2-5 meter in grid arrangement in tunnel upper to be excavated, the region of drill hole sampling will cover excavated tunnel comprehensively
Region locating for road；It again, is mostly detritus inside rock stratum, therefore bored collecting since tunnel is provided with high earthquake zone fracture area
The continuity that rock sample is kept when the rock sample that hole is taken out, need to successively remove the rock taken out from drilling hole, and
The case where rock is placed marshalling in a reservoir, rock sample is enable completely to reflect rock interior rock stratum.
S200, underground water detection: using water detection appratus to the underground water in rock stratum there are situations to detect, and
The area of the underground water source detected, flow direction, spatial position are detected in detail；
Specifically, the presence of the underground water in rock stratum is detected using water detection appratus in above-mentioned steps S200,
When detecting in tunnel excavation region there are when underground water source, need to area to underground water source, flow direction, spatial position carry out it is detailed
Detection, for avoiding in construction groundwater recharge into tunnel internal, when water detection appratus tunnel excavation region is carried out it is detailed
That there are underground water in discovery tunnel excavation region after thin detection, then can directly be excavated.More specifically, it carries out
When underground water detects, if there are underground water in tunnel excavation region for discovery, according to the water size of underground water and judgement
Whether the underground water is underground underground river, if the underground water water is little and is not underground underground river, by carrying out to the underground water
The mode for extracting discharge solves；If the underground water water is larger or the underground water is underground underground river, the road to tunnel is needed
Diameter is modified to avoid underground water at this.
S300, tunnel excavation: after the detection and analysis of step S100 and step S200, selection rock property preferably and
There is no the region of underground water to excavate tunnel, tunnel excavation method stays core local method or seven step steps using Ring Cutting
Method；
Specifically, selection exists after to the lithology and the detailed detection of underground water progress and analysis in tunnel excavation region
Rock property is preferably and tunnel is not excavated in the region of underground water, select when excavation Ring Cutting stay core local method or
Seven step benching tunnelling methods excavate tunnel, and Ring Cutting stays the tunnel excavation method of core local method are as follows: first to tunnel top into
Row excavates, and then excavates respectively to the tunnel side Liang Ge, and the rock at last middle part is cleared up by equipment；Seven step benching tunnelling methods
Tunnel excavation method are as follows: tunnel top is excavated first, then successively the tunnel side Liang Ge is opened twice respectively
It digs, finally divides three layers for the rock at middle part and clear up respectively.Since Ring Cutting stays core local method or seven step benching tunnelling methods to exist
All it is local excavation when excavation, is conducive to carry out supporting to tunnel inner wall in time when excavating, country rock rubble is avoided to collapse.
S400, top protection: the Ring Cutting used in step S300 stay core local method or seven step benching tunnelling methods be intended to from
Tunnel top starts to excavate, and because the area of constructing tunnel is high earthquake zone fracture area, has excavated by tunnel top
Cheng Hou needs to carry out top shield in time, and steps are as follows for Specific construction:
S401, it is laid with chain link fence in tunnel top inner wall, chain link fence is used for the rubble loose to tunnel inner wall
It is blocked, when tunnel top inner wall is laid with chain link fence, first chain link fence need to be supported using support rod, so
Anchor hole is carried out again afterwards to open up；
S402, anchor hole is stamped on the country rock of tunnel top inner wall, the anchor hole opened up on country rock is used to install anchor pole,
Anchor hole needs to throw hole inside Hard Rock Mass into when opening up, and guarantees that anchor pole can be securely held in country rock；
S403, along tunnel direction of travel equidistant laying I-steel parallel to each other, wherein two I-steel parallel to each other
Between laying spacing be 50 centimetres；
S404, I-steel is fixed on inside anchor hole using anchor pole, which can not only fix chain link fence
In tunnel inner wall, moreover it is possible to which the biggish rubble of tunnel inner wall quality is fixed；
Specifically, I-steel to be fixed on to the specific steps inside anchor hole using anchor pole are as follows: anchor pole is first inserted in anchoring
Kong Zhong, then cement slurry made of quick hardening cement is perfused in the gap among anchor pole and anchor hole, finally utilize cement slurry by anchor
Bar is fixed on inside anchor hole.
S500, integer support: core local method or seven step benching tunnelling methods are stayed all to dig entire tunnel cross-section using Ring Cutting
After opening, integer support is carried out again to tunnel side inner walls, steps are as follows for Specific construction:
S501, anchor hole is stamped on the country rock of tunnel side inner walls, the anchor hole opened up on country rock is used to install anchor pole,
Anchor hole needs to throw hole inside Hard Rock Mass into when opening up, and guarantees that anchor pole can be securely held in country rock；
S502, it is laid with chain link fence in tunnel side inner walls, chain link fence is used for the rubble loose to tunnel inner wall
It is blocked；
S503, along tunnel direction of travel equidistant laying I-steel parallel to each other, wherein two I-steel parallel to each other
Between laying spacing be 50 centimetres；
S504, I-steel is fixed on inside anchor hole using anchor pole, which can not only fix chain link fence
In tunnel inner wall, moreover it is possible to which the biggish rubble of tunnel inner wall quality is fixed；
Specifically, I-steel to be fixed on to the specific steps inside anchor hole using anchor pole are as follows: anchor pole is first inserted in anchoring
Kong Zhong, then cement slurry made of quick hardening cement is perfused in the gap among anchor pole and anchor hole, finally utilize cement slurry by anchor
Bar is fixed on inside anchor hole.
S505, it is supported using I-steel of the arch steel structure to all inner walls in tunnel；
Specifically, arch steel structure and I-steel are fixed using bolt after being installed arch steel structure,
Arch steel structure is for further supporting I-steel, wherein arch steel structure agrees with tunnel inner wall；
S506, all inner walls in tunnel progress gunning concrete is fixed, gunning concrete can be by chain link fence and tunnel
Road inner wall is fixed, and further the rubble of tunnel inner wall is fixed.
In order to further optimize the above technical scheme, in step S403 and step S503, I-steel is advanced along tunnel
When direction is laid with, since tunnel is sublevel drive, I-steel be by one section one section respectively splicing be laid with, therefore it is every
It needs to weld together between section I-steel, so that I-steel is formed an entirety, to ensure its stability, fastness.
In order to further optimize the above technical scheme, in step S505, using arch steel structure to all inner walls in tunnel
I-steel is supported, specifically: arch steel structure is first divided into several segments using the mounting means of splicing by arch steel structure,
It is preferred that 9 sections, it installs since tunnel top, every section of splicing is mounted on I-steel during installation respectively, finally encircle each section
Shape welding for steel structure together, makes arch steel structure form an entirety, to ensure its stability, fastness.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. carrying out the construction method of preliminary bracing in a kind of high earthquake zone fracture area constructing tunnel, which is characterized in that this method packet
Include following steps:
S100, rock stratum detection: in tunnel surrounding rock to be excavated carry out drill hole sampling detection, and to rock interior rock stratum into
Row concrete analysis；
S200, underground water detection: using water detection appratus to the underground water in rock stratum there are situations to detect, and to spy
The area of the underground water source measured, flow direction, spatial position are detected in detail；
S300, tunnel excavation: after the detection and analysis of step S100 and step S200, selection is preferable in rock property and does not have
Tunnel is excavated in the region of underground water, and tunnel excavation method stays core local method or seven step benching tunnelling methods using Ring Cutting；
S400, top protection: the Ring Cutting used in step S300 stays core local method or seven step benching tunnelling methods to be intended to from tunnel
Top starts to excavate, and after the completion of excavating tunnel top, Yao Jinhang top shield, steps are as follows for Specific construction:
S401, protective net is laid in tunnel top inner wall；
S402, anchor hole is stamped on the country rock of tunnel top inner wall；
S403, along tunnel direction of travel equidistant laying I-steel parallel to each other；
S404, I-steel is fixed on inside anchor hole using anchor pole；
S500, integer support: after staying core local method or seven step benching tunnelling methods all to excavate entire tunnel cross-section using Ring Cutting,
Integer support is carried out again, and steps are as follows for Specific construction:
S501, anchor hole is stamped on the country rock of tunnel side inner walls；
S502, protective net is laid in tunnel side inner walls；
S503, along tunnel direction of travel equidistant laying I-steel parallel to each other；
S504, I-steel is fixed on inside anchor hole using anchor pole；
S505, it is supported using I-steel of the arch steel structure to all inner walls in tunnel；
S506, all inner walls in tunnel progress gunning concrete is fixed.
2. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S100, when carrying out drill hole sampling detection, the spacing that tube sample boring opens up is 2-5 meters, and tube sample boring
It with spacing is 2-5 meter in grid arrangement in tunnel upper to be excavated；Locating for the tunnel that the region overlay of drill hole sampling is excavated
Region.
3. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S100, when carrying out drill hole sampling detection, the rock taken out from drilling hole need to successively be removed, and
Rock is placed into marshalling in a reservoir, keeps the rock sample taken out completely continuous.
4. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S200, when carrying out underground water detection, if there are underground water, roots in tunnel excavation region for discovery
According to underground water water size and judge whether the underground water is underground underground river, if the underground water water less and be not underground
Underground river is then solved by way of carrying out extracting discharge to the underground water；If the underground water water is larger or the underground water is
Underground underground river then needs to be modified to avoid underground water at this to the path in tunnel.
5. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S300, Ring Cutting stays the tunnel excavation method of core local method are as follows: opens first tunnel top
It digs, then the tunnel side Liang Ge is excavated respectively, the rock at last middle part is cleared up by equipment；The tunnel of seven step benching tunnelling methods
Road digging mode are as follows: tunnel top is excavated first, then successively the tunnel side Liang Ge is excavated twice respectively, most
Divide three layers for the rock at middle part afterwards to clear up respectively.
6. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S401, when tunnel top inner wall is laid with protective net, need to first be propped up using support rod protective net
Support, then carries out anchor hole again and opens up.
7. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S403 and step S503, the laying spacing between two I-steel parallel to each other is 40-60 lis
Rice.
8. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S404 and step S504, the specific steps that are fixed on I-steel using anchor pole inside anchor hole are as follows:
First anchor pole is inserted in anchor hole, then cement slurry made of quick hardening cement is perfused in the gap among anchor pole and anchor hole, most
Anchor pole is fixed on inside anchor hole using cement slurry eventually.
9. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S403 and step S503, I-steel along tunnel direction of travel when being laid with, since tunnel is
Sublevel drive, therefore I-steel is to be spliced to be laid with respectively by one section one section, and need to weld together between every section of I-steel
I-steel is set to form an entirety.
10. the construction method of preliminary bracing is carried out in high earthquake zone fracture area constructing tunnel according to claim 1, it is special
Sign is: in the step S505, it is supported using I-steel of the arch steel structure to all inner walls in tunnel, specifically: arch
Arch steel structure is first divided into several segments, is pacified since tunnel top during installation by shape steel construction using the mounting means of splicing
Every section of splicing, is mounted on I-steel respectively, finally welds together each section of arch steel structure, make arch steel structure shape by dress
At an entirety.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588190A (en) * | 2021-10-08 | 2021-11-02 | 四川藏区高速公路有限责任公司 | Vibration response test device for blasting construction to adjacent existing tunnel |
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