CN109736850A - A kind of tunnel shell arch combination strength bearing structure and its construction method - Google Patents
A kind of tunnel shell arch combination strength bearing structure and its construction method Download PDFInfo
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Abstract
A kind of tunnel shell arch combination strength bearing structure, including tunnel, the section on tunnel top is semicircular arch or skene arch, country rock outside tunnel is followed successively by the country rock outside the country rock within the scope of relaxation zone and relaxation zone within the scope of 1m from inside to outside, the inner wall of country rock within the scope of relaxation zone is provided with branch protective case, and the country rock outside the country rock and relaxation zone within the scope of relaxation zone within the scope of 1m is internally provided with supporting arch.The invention also discloses the construction methods that a kind of tunnel shell encircles combination strength bearing structure.The present invention effectively prevents the loss of strength of country rock in relaxation zone, and forms strong anchoring bearing structure within the scope of relaxation zone and its outside 1m, significantly improves improving stability of surrounding rocks in roadway, and relaxation zone is effectively inhibited to extend to deep；Effectively prevent cracking and the destruction of concrete spray coating；Guarantee is provided steadily in the long term for roadway surrounding rock.
Description
Technical field
The invention belongs to mine engineering roadway surrounding rock control technical fields, and in particular to a kind of tunnel shell arch combination strength is held
Carry structure and its construction method.
Background technique
With the development of colliery tunnel support technology, suspension roof support, cable bolting and grouting reinforcement technique become coal mine
The cost-effective support form in tunnel.In deep high stress and under the conditions of complicated mining induced stress, Popularization And Development is high-strength in recent years
Anchor pole high pretightening force support technology achieves good supporting effect in application at the scene, but under the conditions of weak surrounding rock, still
Occur large area spray-up cracking, supporting construction fracture tearing, country rock continue the tunnels unstable phenomenons such as rheology, to find out its cause, lead
Have the following problems: 1. concrete spray coating is relatively thin, and rigidity and flexible deficiency cannot resist the moderate finite deformation of country rock, cause
There is phenomena such as spray-up cracking, metal mesh tearing；2. roadway support intensity wretched insufficiency, bearing capacity of the wall rock loss is serious, causes
Extend relaxation zone to country rock deep, until anchoring bearing structure fails and tunnel unstability occurs；3. by traditional support idea
It influences, anchor rod strength, pretightning force, support density etc. are not up to corresponding requirements, cause initial deformation that cannot effectively control, and increase
Later maintenance difficulty is added.
Summary of the invention
The present invention in order to solve shortcoming in the prior art, provide a kind of tunnel shell arch combination strength bearing structure and
Its construction method, it is intended to " tough concrete-shell " and " high-strength anchoring Load -carring arch " be formed by supporting for arched tunnel, the two
In conjunction with formation " shell arch combination strength bearing structure ", effectively solve that existing in the prior art " concrete spray coating cracking, anchoring are held
Carry structural failure, roadway deformation be difficult to control " etc. technical problems.
In order to solve the above technical problems, the present invention adopts the following technical scheme: a kind of tunnel shell arch combination strength carrying knot
Structure, including tunnel, the section on tunnel top are semicircular arch or skene arch, and the country rock outside tunnel is followed successively by loosening from inside to outside
The country rock outside the country rock in range and relaxation zone within the scope of 1m is enclosed, the inner wall of the country rock within the scope of relaxation zone is provided with supporting
Shell, country rock outside the country rock and relaxation zone within the scope of relaxation zone within the scope of 1m are internally provided with supporting arch；
The branch protective case is the tough coagulation with a certain toughness formed by the bolt-mesh-spurting supporting of three layers of high-strength high pretightening force
Soil cursting, branch protective case include three layer concrete spray-ups and three batches of the first high strength anchor bars being embedded in inside three layer concrete spray-ups
Nut fastening section, three-layer metal net compress metal mesh and connect the girder steel of the first high strength anchor bar and the outer end of the first grouted anchor bar
Portion, nut fastening section, three-layer metal net and the girder steel of three batches of the first high strength anchor bars correspond to mating setting and pour respectively pre-buried
Inside three layer concrete spray-ups, every layer concrete jetting thickness is 80 ~ 120mm, the overall thickness of tough concrete-shell is 240 ~
360mm；
Supporting arch is by the Bolt net and jet of three layers of high-strength high pretightening force within the scope of relaxation zone and its within the scope of the 1m of outside
The high-strength anchoring Load -carring arch of formation in country rock, supporting arch include the country rock and the first slip casting anchor anchored by the first high strength anchor bar
The slip casting section setting of the country rock that bar is reinforced, the Anchor Agent anchoring section and free segment and grouted anchor bar of three batches of the first high strength anchor bars exists
In the country rock of supporting arch.
The bottom plate of arched tunnel carries out active branch using several the second high strength anchor bars and the second grouted anchor bar grouting and reinforcing
Shield forms the closed active support structure for roadway's sides, top semi-circular arch and bottom plate.
It is high-strength greater than 500MPa's that first high strength anchor bar and the second high strength anchor bar are all made of diameter 22mm or more, yield strength
Left hand thread steel anchor rod and the attachment to match with its intensity；First high strength anchor bar and the second high strength anchor bar use high pretightening force
Installation, prefastening torque require to reach 300 ~ 500N.m, pre-tighten force request and reach 50 ~ 100kN；The metal mesh is diamond shape iron wire
Net, the girder steel are reinforcing bar ladder beam, and the concrete spray coating is not less than 42.5 normal silicate using strength grade
Cement；The injecting paste material that first grouted anchor bar and the second grouted anchor bar use be strength grade for 42.5 normal silicate
Cement, ratio of mud 1:2, while water-reducing agent is added to improve the permeability of slurries.
The arch that the shell arch combination strength bearing structure is formed using high-intensitive, high density anchor pole and grouting and reinforcing
Shape bearing structure, spacing × array pitch of every layer of first high strength anchor bar is 900 in the bolt-mesh-spurting supporting of three layers of high-strength high pretightening force
× 900mm, for three layers of bolt-mesh-spurting supporting all after the completion of construction, spacing × array pitch of the first high strength anchor bar is 300 × 300mm；The
One high strength anchor bar uses anchorage length for the extensible bolting of 1000 ~ 1500mm, wherein relatively stable other than being anchored at relaxation zone enclose
Length in rock is not less than 1000mm；First high strength anchor bar meet " three footpaths mate " anchor principle: bolt diameter, bore diameter and
Resin anchoring agent diameter is respectively 22mm, 28mm and 23mm.
The slip casting of first grouted anchor bar should lag third layer concrete spray coating for a period of time, the injected hole of the first grouted anchor bar
Between the arrangement of array pitch should be according to injecting paste material property, country rock physics classroom teaching and cranny development situation, grouting pressure and existing
The slurries spread condition of field test is comprehensive to be determined.
A kind of construction method of tunnel shell arch combination strength bearing structure, includes the following steps,
(1) according to the productive geological conditions of roadway engineering, drift section chooses the preferable stalk Semicircular arched of stability, and uses
Theory analysis and method for numerical simulation rationally determine the cross dimensions of arched tunnel；
(2) crustal stress, mining induced stress and roadway surrounding rock structure and its rock mechanics parameters are based on, using method for numerical simulation,
Determine the form and size of tunnel surrounding wall rock loosening ring；
(3) based on cross-section shape of roadway and size, surrouding rock stress condition, wall rock loosening ring form and size, reasonable lane is determined
Road supporting intensity and supporting parameter carry out " shell arch combination strength carries " Surrounding Rock Control construction: to lane in time after tunnel excavates
Road two is helped to encircle with top semi-circular, and it is pre- to carry out three layers of high-strength height using " the first high strength anchor bar, metal mesh, girder steel, gunite concrete "
The bolt-mesh-spurting supporting of clamp force, the length of three batches of the first high strength anchor bars should be anchored to the stable region 1m or more other than relaxation zone；
(4) after the completion of to roadway's sides and top semi-circular arch construction, using the second high strength anchor bar and the second grouted anchor bar to tunnel
Bottom plate carries out active support, and carries out concrete hardening processing to bottom plate；
The Specific construction process of step (3) is,
Tunnel carries out first layer combination supporting, sequence of construction after excavating in time are as follows: in roadway's sides and top semi-circular arch paving first
Layer metal mesh, extension first layer girder steel --- install first first high strength anchor bar and implement high pretightening force --- injection first layer are mixed
Solidifying soil spray-up；
After first layer concrete spray coating is completed and solidified, implement second layer combination supporting, sequence of construction are as follows: in first layer coagulation
Native spray-up lateral wall paving second layer metal net hangs second layer girder steel --- and installation the first high strength anchor bar of second batch simultaneously implements high preload
Power --- injection second layer concrete spray coating；
After second layer concrete spray coating is completed and solidified, implement third layer combination supporting, sequence of construction are as follows: in second layer coagulation
Native spray-up lateral wall paving third layer metal mesh hangs third layer girder steel --- and installation the first high strength anchor bar of third batch simultaneously implements high preload
Power --- injection third layer concrete spray coating, third layer concrete ejection complete third layer combination branch after completing and solidifying
Shield；
After completing third layer combination supporting, certain time is lagged, when wall-rock crack is relatively developed, using the first grouted anchor bar pair
Country rock in roadway's sides and top semi-circular arch relaxation zone carries out grouting and reinforcing.
By adopting the above technical scheme, the invention has the following advantages: 1. " shell arch combination bearing structure " includes arch
Tunnel, branch protective case and supporting arch, by implementing this technology, effectively prevent the loss of strength of country rock in relaxation zone, and loosening
Strong anchoring bearing structure is formd within the scope of circle and its outside 1m, improving stability of surrounding rocks in roadway is significantly improved, effectively inhibits pine
Moving-coil is extended to deep；2. the implementation of technical solution through the invention is formd tough with certain thickness and certain toughness
Concrete-shell, rigidity and it is flexible mention significantly high, effectively prevent cracking and the destruction of concrete spray coating；3. skill through the invention
The implementation of art scheme significantly improves supporting intensity, initial pretightening force and the working resistance in tunnel, significantly improves " shell arch group
Close bearing structure " ability of tunnel initial deformation and long-term rheology is resisted, guarantee is provided steadily in the long term for roadway surrounding rock.
Detailed description of the invention
Fig. 1 is tunnel shell arch combination strength bearing structure schematic diagram；
Fig. 2 is tunnel shell arch combination strength bearing structure partial enlarged view；
In figure, 1 is tunnel, and 2 be branch protective case, and 3 encircle for supporting, and 4 be first layer concrete spray coating, and 5 be second layer concrete spray coating,
6 be third layer concrete spray coating, and 7 be first first high strength anchor bar, and 8 be the first high strength anchor bar of second batch, and 9 be third batch first
High strength anchor bar, 10 be the nut fastening section of the first high strength anchor bar, and 11 be the first layer metal net in first layer concrete spray coating, 12
It is the third layer metal mesh in third layer concrete spray coating for the second layer metal net in second layer concrete spray coating, 13,14 are
First layer girder steel in first layer concrete spray coating, 15 be the second layer girder steel in second layer concrete spray coating, and 16 be third layer
Third layer girder steel in concrete spray coating, 17 be the first grouted anchor bar, and 18 be the outer end of the first grouted anchor bar, and 19 be loosening
Circle, 20 be the country rock within the scope of relaxation zone, and 21 be the country rock within the scope of 1m outside relaxation zone, and 22 be the anchoring of the first high strength anchor bar
Agent anchoring section, 23 be the free segment of the first high strength anchor bar, and 24 be the slip casting section of the first grouted anchor bar, and 25 be the second high strength anchor bar,
26 be the second grouted anchor bar.
Specific embodiment
As depicted in figs. 1 and 2, a kind of tunnel shell of the invention arch combination strength bearing structure, including tunnel 1, tunnel 1
The section on top is semicircular arch or skene arch, the country rock outside tunnel 1 be followed successively by from inside to outside country rock 20 within the scope of relaxation zone,
The inner wall of country rock 21 outside relaxation zone and relaxation zone within the scope of 1m, the country rock 20 within the scope of relaxation zone is provided with branch protective case 2,
The supporting that is internally provided with of country rock 21 outside country rock 20 and relaxation zone within the scope of relaxation zone within the scope of 1m encircles 3；
The branch protective case 2 is the tough coagulation with a certain toughness formed by the bolt-mesh-spurting supporting of three layers of high-strength high pretightening force
Soil cursting, branch protective case 2 include three layer concrete spray-ups and three batches of the first high strength anchor bars being embedded in inside three layer concrete spray-ups
Nut fastening section 10, three-layer metal net, compress metal mesh and connect the first high strength anchor bar girder steel and the first grouted anchor bar 17
Outer end, nut fastening section, three-layer metal net and the girder steel of three batches of the first high strength anchor bars correspond to it is mating setting and pour respectively
It builds and is embedded in inside three layer concrete spray-ups, every layer concrete jetting thickness is 80 ~ 120mm, the overall thickness of tough concrete-shell
For 240 ~ 360mm；
Supporting arch 3 is by the Bolt net and jet of three layers of high-strength high pretightening force within the scope of relaxation zone and its within the scope of the 1m of outside
The high-strength anchoring Load -carring arch of formation in country rock, supporting arch 3 include the country rock and first anchored by three batches of the first high strength anchor bars
The country rock that grouted anchor bar 17 is reinforced, the slip casting of the Anchor Agent anchoring section and free segment and grouted anchor bar of three batches of the first high strength anchor bars
Section is arranged in the country rock of supporting arch 3.
The bottom plate of arched tunnel 1 is led using several the second high strength anchor bars 25 and 26 grouting and reinforcing of the second grouted anchor bar
Dynamic supporting forms the closed active support structure for 1 liang of tunnel side, top semi-circular arch and bottom plate.
First high strength anchor bar and the second high strength anchor bar 25 are all made of diameter 22mm or more, yield strength is greater than the height of 500MPa
Strong left hand thread steel anchor rod and the attachment to match with its intensity；First high strength anchor bar and the second high strength anchor bar 25 are using high pre-
Clamp force installation, prefastening torque require to reach 300 ~ 500N.m, pre-tighten force request and reach 50 ~ 100kN；The metal mesh is diamond shape iron
Silk screen, the girder steel are reinforcing bar ladder beam, and the concrete spray coating is not less than 42.5 common silicic acid using strength grade
Salt cement；The injecting paste material that first grouted anchor bar 17 and the second grouted anchor bar 26 use be strength grade for 42.5 it is common
Portland cement, ratio of mud 1:2, while water-reducing agent is added to improve the permeability of slurries.
The arch that the shell arch combination strength bearing structure is formed using high-intensitive, high density anchor pole and grouting and reinforcing
Shape bearing structure, spacing × array pitch of every layer of first high strength anchor bar is 900 in the bolt-mesh-spurting supporting of three layers of high-strength high pretightening force
× 900mm, for three layers of bolt-mesh-spurting supporting all after the completion of construction, spacing × array pitch of the first high strength anchor bar is 300 × 300mm；The
One high strength anchor bar uses anchorage length for the extensible bolting of 1000 ~ 1500mm, wherein relatively stable other than being anchored at relaxation zone enclose
Length in rock is not less than 1000mm；First high strength anchor bar meet " three footpaths mate " anchor principle: bolt diameter, bore diameter and
Resin anchoring agent diameter is respectively 22mm, 28mm and 23mm.
The slip casting of first grouted anchor bar 17 should lag third layer concrete spray coating for a period of time, the note of the first grouted anchor bar 17
Starch hole between array pitch arrangement should according to injecting paste material property, country rock physics classroom teaching and cranny development situation, grouting pressure with
And the comprehensive determination of slurries spread condition of on-the-spot test.
A kind of construction method of tunnel shell arch combination strength bearing structure, includes the following steps,
(1) according to the productive geological conditions of 1 engineering of tunnel, 1 section of tunnel chooses the preferable stalk Semicircular arched of stability, and adopts
With theory analysis and method for numerical simulation, the cross dimensions of arched tunnel 1 is rationally determined；
(2) crustal stress, mining induced stress and 1 surrounding rock structure of tunnel and its rock mechanics parameters are based on, using method for numerical simulation,
Determine the form and size of 1 surrounding wall rock loosening ring of tunnel；
(3) based on 1 section configuration of tunnel and size, surrouding rock stress condition, wall rock loosening ring form and size, reasonable lane is determined
1 supporting intensity of road and supporting parameter carry out " shell arch combination strength carries " Surrounding Rock Control construction: right in time after tunnel 1 excavates
1 liang of tunnel side and top semi-circular arch, carry out three layers of high-strength height using " the first high strength anchor bar, metal mesh, girder steel, gunite concrete "
The bolt-mesh-spurting supporting of pretightning force, the length of three batches of the first high strength anchor bars should be anchored to the stable region 1m or more other than relaxation zone；
(4) right using the second high strength anchor bar 25 and the second grouted anchor bar 26 after the completion of to 1 liang of tunnel side and top semi-circular arch construction
1 bottom plate of tunnel carries out active support, and carries out concrete hardening processing to bottom plate；
The Specific construction process of step (3) is,
Tunnel 1 carries out first layer combination supporting, sequence of construction after excavating in time are as follows: side and the top semi-circular arch paving the 1 liang of tunnel
One layer of metal mesh 11 hangs first layer girder steel 14 --- install first first high strength anchor bar 7 and implement high pretightening force --- injection
First layer concrete spray coating 4；
After first layer concrete spray coating 4 is completed and solidified, implement second layer combination supporting, sequence of construction are as follows: mixed in first layer
4 lateral wall upper berth second layer metal net 12 of solidifying soil spray-up hangs second layer girder steel 15 --- and installation the first high strength anchor bar of second batch 8 is simultaneously
Implement high pretightening force --- the second concrete spray coating 5 of injection；
After second layer concrete spray coating 5 is completed and solidified, implement third layer combination supporting, sequence of construction are as follows: mixed in the second layer
Solidifying soil 5 lateral wall of spray-up paving third layer metal mesh 13 hangs third layer girder steel 16 --- and the first high strength anchor bar of installation third batch 8 is simultaneously real
Apply high pretightening force --- injection third layer concrete spray coating 6, the injection of third layer concrete spray coating 6 are completed and are completed after solidifying
Third layer combination supporting；
After completing third layer combination supporting, certain time is lagged, when wall-rock crack is relatively developed, using the first grouted anchor bar 17
Grouting and reinforcing is carried out to the country rock in 1 liang of tunnel side and top semi-circular arch relaxation zone.
The present embodiment not makes any form of restriction shape of the invention, material, structure etc., all according to this hair
Bright technical spirit any simple modification, equivalent change and modification to the above embodiments, belong to the technology of the present invention side
The protection scope of case.
Claims (7)
1. a kind of tunnel shell arch combination strength bearing structure, including tunnel, the section on tunnel top are semicircular arch or skene arch, lane
Country rock outside road is followed successively by the country rock outside the country rock within the scope of relaxation zone and relaxation zone within the scope of 1m, feature from inside to outside
Be: the inner wall of the country rock within the scope of relaxation zone is provided with branch protective case, 1m model outside the country rock and relaxation zone within the scope of relaxation zone
The supporting that is internally provided with of country rock in enclosing is encircleed；
The branch protective case is the tough coagulation with a certain toughness formed by the bolt-mesh-spurting supporting of three layers of high-strength high pretightening force
Soil cursting, branch protective case include three layer concrete spray-ups and three batches of the first high strength anchor bars being embedded in inside three layer concrete spray-ups
Nut fastening section, three-layer metal net compress metal mesh and connect the girder steel of the first high strength anchor bar and the outer end of the first grouted anchor bar
Portion, nut fastening section, three-layer metal net and the girder steel of three batches of the first high strength anchor bars correspond to mating setting and pour respectively pre-buried
Inside three layer concrete spray-ups, every layer concrete jetting thickness is 80 ~ 120mm, the overall thickness of tough concrete-shell is 240 ~
360mm；
Supporting arch is by the Bolt net and jet of three layers of high-strength high pretightening force within the scope of relaxation zone and its within the scope of the 1m of outside
The high-strength anchoring Load -carring arch of formation in country rock, supporting arch include the country rock and the first slip casting anchor anchored by the first high strength anchor bar
The slip casting section setting of the country rock that bar is reinforced, the Anchor Agent anchoring section and free segment and grouted anchor bar of three batches of the first high strength anchor bars exists
In the country rock of supporting arch.
2. a kind of tunnel shell arch combination strength bearing structure according to claim 1, it is characterised in that: the bottom of arched tunnel
Plate carries out active support using several the second high strength anchor bars and the second grouted anchor bar grouting and reinforcing, formed for roadway's sides,
The closed active support structure of top semi-circular arch and bottom plate.
3. a kind of tunnel shell arch combination strength bearing structure according to claim 2, it is characterised in that: the first high strength anchor bar
With the second high strength anchor bar be all made of diameter 22mm or more, yield strength greater than 500MPa high-strength left hand thread steel anchor rod and with
The attachment that its intensity matches；First high strength anchor bar and the second high strength anchor bar are installed using high pretightening force, and prefastening torque requires to reach
To 300 ~ 500N.m, pre-tightens force request and reach 50 ~ 100kN；The metal mesh is diamond shape wire netting, and the girder steel is reinforcing bar ladder
Beam, the concrete spray coating are not less than 42.5 ordinary portland cement using strength grade；First grouted anchor bar
The injecting paste material used with the second grouted anchor bar be strength grade for 42.5 ordinary portland cement, ratio of mud 1:2 mixes simultaneously
Aqua is added and subtracted to improve the permeability of slurries.
4. a kind of tunnel shell arch combination strength bearing structure according to claim 3, it is characterised in that: the shell arch group
The arch bearing structure that strength bearing structure is formed using high-intensitive, high density anchor pole and grouting and reinforcing is closed, three layers high-strength
Spacing × array pitch of every layer of first high strength anchor bar is 900 × 900mm, three layers of Bolt net and jet branch in the bolt-mesh-spurting supporting of high pretightening force
For shield all after the completion of construction, spacing × array pitch of the first high strength anchor bar is 300 × 300mm；First high strength anchor bar is using anchoring length
Degree is the extensible bolting of 1000 ~ 1500mm, wherein the length being anchored at other than relaxation zone in opposite stabilizing surrounding rock is not less than
1000mm；First high strength anchor bar meets " three footpaths mate " and anchors principle: bolt diameter, bore diameter and resin anchoring agent diameter point
It Wei not 22mm, 28mm and 23mm.
5. a kind of tunnel shell arch combination strength bearing structure according to claim 4, it is characterised in that: the first grouted anchor bar
Slip casting should lag third layer concrete spray coating for a period of time, the arrangement of array pitch should be according to note between the injected hole of the first grouted anchor bar
Pulp material property, country rock physics classroom teaching and cranny development situation, grouting pressure and the slurries of on-the-spot test spread condition
It is comprehensive to determine.
6. a kind of construction method of tunnel shell arch combination strength bearing structure as claimed in claim 5, it is characterised in that: including
Following steps,
(1) according to the productive geological conditions of roadway engineering, drift section chooses the preferable stalk Semicircular arched of stability, and uses
Theory analysis and method for numerical simulation rationally determine the cross dimensions of arched tunnel；
(2) crustal stress, mining induced stress and roadway surrounding rock structure and its rock mechanics parameters are based on, using method for numerical simulation,
Determine the form and size of tunnel surrounding wall rock loosening ring；
(3) based on cross-section shape of roadway and size, surrouding rock stress condition, wall rock loosening ring form and size, reasonable lane is determined
Road supporting intensity and supporting parameter carry out " shell arch combination strength carries " Surrounding Rock Control construction: to lane in time after tunnel excavates
Road two is helped to encircle with top semi-circular, and it is pre- to carry out three layers of high-strength height using " the first high strength anchor bar, metal mesh, girder steel, gunite concrete "
The bolt-mesh-spurting supporting of clamp force, the length of three batches of the first high strength anchor bars should be anchored to the stable region 1m or more other than relaxation zone；
(4) after the completion of to roadway's sides and top semi-circular arch construction, using the second high strength anchor bar and the second grouted anchor bar to tunnel
Bottom plate carries out active support, and carries out concrete hardening processing to bottom plate.
7. a kind of construction method of tunnel shell arch combination strength bearing structure as claimed in claim 5, it is characterised in that: step
(3) Specific construction process is,
Tunnel carries out first layer combination supporting, sequence of construction after excavating in time are as follows: in roadway's sides and top semi-circular arch paving first
Layer metal mesh, extension first layer girder steel --- install first first high strength anchor bar and implement high pretightening force --- injection first layer are mixed
Solidifying soil spray-up；
After first layer concrete spray coating is completed and solidified, implement second layer combination supporting, sequence of construction are as follows: in first layer coagulation
Native spray-up lateral wall paving second layer metal net hangs second layer girder steel --- and installation the first high strength anchor bar of second batch simultaneously implements high preload
Power --- injection second layer concrete spray coating；
After second layer concrete spray coating is completed and solidified, implement third layer combination supporting, sequence of construction are as follows: in second layer coagulation
Native spray-up lateral wall paving third layer metal mesh hangs third layer girder steel --- and installation the first high strength anchor bar of third batch simultaneously implements high preload
Power --- injection third layer concrete spray coating, third layer concrete ejection complete third layer combination branch after completing and solidifying
Shield；
After completing third layer combination supporting, certain time is lagged, when wall-rock crack is relatively developed, using the first grouted anchor bar pair
Country rock in roadway's sides and top semi-circular arch relaxation zone carries out grouting and reinforcing.
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| CN111911209A (en) * | 2020-08-17 | 2020-11-10 | 河北工程大学 | Accurate targeted anchor grouting control method suitable for deep soft rock roadway |
| CN112832802A (en) * | 2021-03-04 | 2021-05-25 | 淮北市平远软岩支护工程技术有限公司 | Large-bottom plate supporting structure and method for asymmetric pressure |
| CN113339031A (en) * | 2021-07-22 | 2021-09-03 | 内蒙古上海庙矿业有限责任公司 | Roadway support process system under extremely soft stratum condition and construction method |
| CN113638745A (en) * | 2021-09-03 | 2021-11-12 | 淮北市平远软岩支护工程技术有限公司 | Method and equipment for reinforcing homogeneous supporting ring body of high-impact-ground-pressure roadway |
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