CN110107304A - A kind of shield launching receives well borehole wall part FRP tendons method for protecting support - Google Patents
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support Download PDFInfo
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- CN110107304A CN110107304A CN201910417946.0A CN201910417946A CN110107304A CN 110107304 A CN110107304 A CN 110107304A CN 201910417946 A CN201910417946 A CN 201910417946A CN 110107304 A CN110107304 A CN 110107304A
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- reinforcing bar
- borehole wall
- excavation
- fpr
- shield
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 210000002435 tendon Anatomy 0.000 title claims abstract description 27
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 97
- 238000009412 basement excavation Methods 0.000 claims abstract description 85
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 239000004567 concrete Substances 0.000 claims abstract description 47
- 230000002787 reinforcement Effects 0.000 claims abstract description 25
- 238000010276 construction Methods 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 14
- 239000011378 shotcrete Substances 0.000 claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 12
- 239000002689 soil Substances 0.000 claims description 25
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 21
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 239000004575 stone Substances 0.000 description 9
- 210000003205 muscle Anatomy 0.000 description 6
- 229920002748 Basalt fiber Polymers 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
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- 229920006253 high performance fiber Polymers 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
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- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 101710185324 GTP cyclohydrolase 1 feedback regulatory protein Proteins 0.000 description 1
- 229920006387 Vinylite Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
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- 239000011241 protective layer Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention relates to borehole wall support technology fields, and it discloses shield launching or receives well borehole wall part FRP tendons method for protecting support, pass through earth excavation, modify side slope, reinforcement placing net, fill gap, gunite concrete and etc. realize launching shaft and receive the borehole wall supporting of well, wherein steel mesh is mixed with FPR reinforcing bar for common HRB335 reinforcing bar and is built, steel mesh main body is built using HRB335 reinforcing bar, FPR reinforcing bar is changed at tunnel excavation mouth to build with the dislocation of HRB335 reinforcing bar, steel mesh is HRB335 reinforcing bar and FPR bar splicing using mechanical connection or welding manner, and length is built not less than 35d, it is high using FPR Steel Bar Tensile Strength, it is light-weight, processing carrying and installation easy to cut, and it is easy to twist when resisting torque and change at the features such as disconnected tunnel excavation mouth For FPR reinforcing bar, realize that part replaces, to realize construction safety, shield cutter, which can be tunneled directly, carries out opening operation, and shield directly tunnels the borehole wall of starting well or received well, working security height, short time limit, low cost.
Description
Technical field
The present invention relates to borehole wall support technology field, specially a kind of shield launching or receive well borehole wall part FRP tendons branch
Maintaining method.
Background technique
Shield launching well construction is one of master operation of shield tunnel, and shield method is that one of shallow mining method is complete
Mechanized construction method, it is to promote Shield-type machinery in ground, and supporting surrounding country rock by shield shell and section of jurisdiction prevents from sending out
The raw collapsing in tunnel, while soil excavation is carried out with cutting apparatus in front of excavation face, by being unearthed, machinery is transported outside hole,
By jack in rear pressurization jacking, and assembled precast concrete section of jurisdiction, form a kind of mechanized construction method of tunnel structure.
Wherein shield machine appearance has nearly 200 years history so far, starts from Britain, is developed in Japan, Germany, more than 40 years, passes through
To key technology earth pressure balanced, in slurry type shield machine, such as effective sealing of shield machine, it is ensured that the stabilization of excavation face, control
It surface uplift processed and is collapsed upon within prescribed limit, cutting-tool's used life and the cutter changing under air-proof condition, to one
It the explorations of processing technique of some severe for example high hydraulic conditions of geology etc. and researchs and solves, shield machine is made to have cracking development
Basic functional principle is exactly that the steel component an of cylindrical body excavates soil when pushing ahead along canal axes.The cylinder
Shell, that is, shield of body component, it plays a part of temporary support to the also unlined Tunnel Section excavated, and bears surrounding soil
The pressure of layer, sometimes outside also subject to ground water pressure and by underground water gear.The operations such as excavation, casting, lining cutting are in shield
Shielding is lower to be carried out.Shield launching passes through starting well and reaches the work progress for drilling through received well, is the main wind of shield tunnel
Dangerous, control is bad, be easy to cause accident.It originates and reaches and pass through one of difficult point of supporting construction and be shield cutter to common
Reinforced concrete shaft lining in reinforcing bar be difficult to twist disconnected, usually using the method for artificial broken chisel, not only operating environment is arduous, and
It is very easy to the landslide of borehole wall water burst in work progress, leads to settlement of stratum, jeopardizes surrounding building and underground utilities etc..If with
Shield cutter directly tunnels and carries out opening operation, then reinforcing bar is easy winding, abrasion cutterhead and cutter, causes mechanical breakdown.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of shield launching or receive the FRP tendons supporting of well borehole wall part
Method has the advantages that borehole wall that can directly tunnel starting well or received well with shield, solves and directly dug with shield cutter
Into opening operation is carried out, reinforcing bar is easy the problem of winding, wearing cutterhead and cutter, cause mechanical breakdown.
(2) technical solution
To achieve the above object, the invention provides the following technical scheme: a kind of shield launching or receiving well borehole wall part FRP
Muscle method for protecting support, comprising the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: according to borehole wall chamfered shape reinforcement placing bracket.
(4) it fills gap: filling broken spoil between the borehole wall and Steel bar rack.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil.
Preferably, after the earth excavation should supporting immediately, exposure duration be no more than 48h, not can be carried out and once scrape out
Payment form of construction work is carried out again.
Preferably, concrete ejection processing first is carried out to borehole wall inside before the reinforcement placing net and is formed with concrete
Protective layer.
Preferably, the steel mesh is mixed with FPR reinforcing bar for common HRB335 reinforcing bar and is built, and steel mesh main body uses
HRB335 reinforcing bar is built, and FPR reinforcing bar is changed at tunnel excavation mouth and is built with the dislocation of HRB335 reinforcing bar, HRB335 reinforcing bar and FPR
Bar splicing builds length not less than 35d using mechanical connection or welding manner.
Preferably, the spoil partial size is chosen for the spoil no more than 100mm.
Preferably, in the step (5) shotcrete layer thickness in 100mm between 300mm.
(3) beneficial effect
Compared with prior art, the present invention provides a kind of shield launching or receive well borehole wall part FRP tendons method for protecting support,
Have it is following the utility model has the advantages that
The shield launching receives well borehole wall part FRP tendons method for protecting support, by changing common steel mesh to steel mesh
It mixes and builds with FPR reinforcing bar for HRB335 reinforcing bar, steel mesh main body is built using HRB335 reinforcing bar, at tunnel excavation mouth
It is changed to FPR reinforcing bar to build with the dislocation of HRB335 reinforcing bar, HRB335 reinforcing bar and FPR bar splicing are using mechanical connection or welding side
Formula, and build length not less than 35d, solves directly tunnel with shield cutter and carries out opening operation, and reinforcing bar is easy winding, wears
Cutterhead and cutter, tunnel shield cutter directly and carry out opening operation the problem of causing mechanical breakdown, improve construction peace
Quan Xinggao, it shortens the duration, reduce cost.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution in the embodiment of the present invention is clearly and completely retouched
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Domestic basalt fibre (BFRP) muscle or glass fibre (GFRP) muscle (external common carbon fibre bar CFRP and virtue
Synthetic fibre fiber bar AFRP cost is higher) it is tensile strength high (ultimate tensile strength be HRB335 reinforcing bar 1.5-3.0 times), light-weight
(density is the 1/5~1/4 of HRB335 reinforcing bar) is easy to be easy to twist (springform of breaking when cutting processing and carrying and installation, resistance torque
Amount is 0.22-0.23 times of HRB335 reinforcing bar, and elongation is 0.13-0.14 times of HRB335 reinforcing bar), it is good with concrete binding
Characteristics such as (reaching 4.5~6.5MPa with the adhesive tensile resistance strength degree value of C40 concrete), basalt fiber tendons (BFRP) be with
Basalt fibre is reinforcing material and synthetic resin (unsaturated polyester (UP), epoxy resin, vinylite etc.) and filler, curing agent
Equal matrixes combine, through a kind of molding advanced composite material (ACM) of pultrude process.Unlike reinforcing bar, basalt fiber tendons density
It is 1.9~2.1g/cm3, about 1/4 (reinforcing bar density be 7.8~7.9) of reinforcing bar；The tensile yield strength of basalt fiber tendons
It is 2~3 times of reinforcing bar, thermal expansion coefficient is close with concrete, it is ensured that concrete deformation synchronous with muscle material.Basalt is fine
Tie up muscle be a kind of rustless electrical insulator, have it is non magnetic, especially: have high acid resistance and alkali resistance.To cement
Moisture concentration and carbon dioxide in mortar are impregnated with and spread permission with higher, can prevent the coagulation under harsh environment
The corrosion of native structures, to have the function that the durability for improving building, in launching shaft or the shield of the received well borehole wall
Structure tunnel range in, glass fiber-reinforced polymer is called glass-fiber reinforcement material, is commonly called as glass muscle or fiber bar, be by high-performance fiber with synthesize
Resin matrix, curing agent are formed by material using moulding process appropriate；High-performance fiber is reinforcing material, and synthetic resin is
Basis material fiber has very high tensile strength, is the main provider of fibre reinforced composites intensity, with FRP tendons office
Portion replaces reinforcing bar, and the borehole wall of starting well or received well can be directly tunneled with shield, has working security height, short time limit, makes
The features such as valence is low.
Embodiment one:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing use welding manner, and the lap of splice is 35d, and side length of element is 200 millimeters, is used
Welding manner can reduce cost.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 150mm.
Embodiment two:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing use welding manner, and the lap of splice is 35d, and side length of element is 300 millimeters, is used
Welding manner and compared with embodiment one increase side length of element more reduce cost, can be used in the not high situation of intensity requirement.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 150mm.
Embodiment three:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing are using mechanical connection, and the lap of splice is 35d, and side length of element is 250 millimeters, is used
Although being mechanically connected increase cost but easy for construction, the reinforcing bar only change of generation in shape, physical property not change, increasing
Add the stability of steel mesh.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 150mm.
Example IV:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing are using mechanical connection, and the lap of splice is 35d, and side length of element is 300 millimeters, is used
Although being mechanically connected increase cost but easy for construction, the reinforcing bar only change of generation in shape, physical property not change, increasing
Add the stability of steel mesh.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 150mm.
Embodiment five:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing use welding manner, and the lap of splice is 35d, and side length of element is 200 millimeters, is used
Welding manner can reduce cost.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 250mm.
Embodiment six:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing use welding manner, and the lap of splice is 35d, and side length of element is 300 millimeters, is used
Welding manner and compared with embodiment five increase side length of element more reduce cost, can be used in the not high situation of intensity requirement.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 250mm.
Embodiment seven:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing are using mechanical connection, and the lap of splice is 35d, and side length of element is 250 millimeters, is used
Although being mechanically connected increase cost but easy for construction, the reinforcing bar only change of generation in shape, physical property not change, increasing
Add the stability of steel mesh.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 250mm.
Embodiment eight:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing are using mechanical connection, and the lap of splice is 35d, and side length of element is 300 millimeters, is used
Although being mechanically connected increase cost but easy for construction, the reinforcing bar only change of generation in shape, physical property not change, increasing
Add the stability of steel mesh.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 250mm.
Embodiment nine:
A kind of shield launching receives well borehole wall part FRP tendons method for protecting support, comprising the following steps:
1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting, should prop up immediately after earth excavation
Shield, exposure duration are no more than 48h, not can be carried out primary scrape out and carry out payment form of construction work again.
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and slope leveling degree is permitted
Perhaps deviation is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil.
(3) reinforcement placing net: concrete ejection processing is carried out to borehole wall inside first and is formed with concrete shield root
According to borehole wall chamfered shape reinforcement placing bracket, used steel mesh be common HRB335 reinforcing bar mixed with FPR reinforcing bar build and
At steel mesh main body is built using HRB335 reinforcing bar, and FPR reinforcing bar is changed at tunnel excavation mouth and is taken with the dislocation of HRB335 reinforcing bar
It builds, HRB335 reinforcing bar and FPR bar splicing are using mechanical connection, and the lap of splice is 35d, and side length of element is 300 millimeters, is used
Although being mechanically connected increase cost but easy for construction, the reinforcing bar only change of generation in shape, physical property not change, increasing
Add the stability of steel mesh.
(4) gap: the spoil of filled stone partial size 100mm between the borehole wall and Steel bar rack is filled.
(5) gunite concrete: mixed towards the side injection in well in spoil layer after steel mesh and gap filling completion
Solidifying soil, concrete layer is with a thickness of 300mm.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of shield launching receives well borehole wall part FRP tendons method for protecting support, which comprises the following steps:
(1) earth excavation: earth excavation follows stage excavation, the method for being layered supporting；
(2) modify side slope: excavation of foundation pit is in mechanical excavation and then carries out manual amendment slope surface, and the permission of slope leveling degree is inclined
Difference is ± 20mm, before slope surface carries out supporting, first carries out the removing of slope surface loosened soil；
(3) reinforcement placing net: according to borehole wall chamfered shape reinforcement placing bracket；
(4) it fills gap: filling broken spoil between the borehole wall and Steel bar rack；
(5) gunite concrete: after steel mesh and gap filling completion, coagulation is sprayed towards the side in well in spoil layer
Soil.
2. a kind of shield launching according to claim 1 receives well borehole wall part FRP tendons method for protecting support, feature exists
In: after step (1) earth excavation should supporting immediately, exposure duration is no more than 48h, not can be carried out and once scrape out and propped up
Pay form of construction work.
3. a kind of shield launching according to claim 1 receives well borehole wall part FRP tendons method for protecting support, feature exists
In: concrete ejection processing is carried out to borehole wall inside first before the step (3) and is formed with concrete shield.
4. a kind of shield launching according to claim 1 receives well borehole wall part FRP tendons method for protecting support, feature exists
In: steel mesh used in the step (3) is mixed with FPR reinforcing bar for common HRB335 reinforcing bar and is built, steel mesh main body
It is built using HRB335 reinforcing bar, FPR reinforcing bar is changed at tunnel excavation mouth and is built with the dislocation of HRB335 reinforcing bar.
5. a kind of shield launching according to claim 1 receives well borehole wall part FRP tendons method for protecting support, feature exists
In: steel mesh used in the step (3) is that HRB335 reinforcing bar and FPR bar splicing use mechanical connection or welding manner,
And building length is 30d to 40d.
6. a kind of shield launching according to claim 1 receives well borehole wall part FRP tendons method for protecting support, feature exists
In: spoil partial size is 50mm to 100mm in the step (4).
7. a kind of shield launching according to claim 1 receives well borehole wall part FRP tendons method for protecting support, feature exists
In: shotcrete layer thickness is in 100mm between 300mm in the step (5).
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| CN201910417946.0A CN110107304A (en) | 2019-05-20 | 2019-05-20 | A kind of shield launching receives well borehole wall part FRP tendons method for protecting support |
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| CN201910417946.0A CN110107304A (en) | 2019-05-20 | 2019-05-20 | A kind of shield launching receives well borehole wall part FRP tendons method for protecting support |
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| CN105909253A (en) * | 2016-04-07 | 2016-08-31 | 中建交通建设集团有限公司 | Quick receiving method for shield receiving vertical shaft without lining structure |
| CN109736354A (en) * | 2018-12-30 | 2019-05-10 | 中铁十四局集团有限公司 | Tunnel open excavation section main structure construction method |
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| JPH01315586A (en) * | 1988-03-24 | 1989-12-20 | Ing Giovanni Rodio & C Impresa Costruzioni Speciali Spa | Method and device for expanding diameter of tunnel |
| CN101614126A (en) * | 2008-06-27 | 2009-12-30 | 深圳市海川实业股份有限公司 | A kind of job practices of directly cutting guard post for tunnel end well by shield machine |
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| CN102561358A (en) * | 2010-12-22 | 2012-07-11 | 中国建筑第七工程局有限公司 | Construction method of ahead mini type composite soil nail wall support |
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Application publication date: 20190809 |