CN104832187B - A kind of high stress and soft rock mine roadway support system containing wire netting backboard and construction method - Google Patents
A kind of high stress and soft rock mine roadway support system containing wire netting backboard and construction method Download PDFInfo
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- CN104832187B CN104832187B CN201510159243.4A CN201510159243A CN104832187B CN 104832187 B CN104832187 B CN 104832187B CN 201510159243 A CN201510159243 A CN 201510159243A CN 104832187 B CN104832187 B CN 104832187B
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- bow member
- wire netting
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- arch
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Abstract
The invention discloses a kind of high stress and soft rock mine roadway support system containing wire netting backboard and construction method, its structure is followed successively by from inside to outside：Packing material and bolt-mesh-spurting supporting after wire netting backboard, confined concrete bow member, packing material block cloth, wall；The wire netting backboard is located at the lower section of confined concrete bow member, connects between wire netting backboard and packing material block cloth；The confined concrete bow member outer rim is connected by prestress wire with the anchor pole of bolt-mesh-spurting supporting.Have the beneficial effect that：Wire netting backboard is placed on the downside of bow member, reduces wire netting back veneer material consumption；The change of wire netting tergal position, so that bow member and the concrete material directly contact filled, so that bow member stress tends to uniform, realize bow member-filling bed-country rock three to carry jointly, improve bow member integer support performance, the self-bearing ability of the bearing capacity and country rock of bow member is played, has been conducive to the stability of supporting.
Description
Technical field
The present invention relates to the support system and construction method in a kind of tunnel of backboard containing wire netting, especially relate to a kind of true
Determine high stress and soft rock mine roadway support system wire netting backboard installation site arrangement and method for construction.
Background technology
In recent years, bolt-spary supports is at home and abroad used widely.The current bolt-spary supports used in roadway with large deformation
Subject matter is that the flexibility of spray-up and anchor pole is mismatched very much, and under surrouding rock deformation and concussion of blasting effect, spray-up premature rupture loses
Effect, loses the condition coefficient with anchor pole, causes country rock performance constantly to deteriorate, and country rock and concrete fall block successively, sternly
Heavy causes roof fall and side falling accident.In order to avoid spray-up premature rupture, one of them effective method is laid in concrete
Wire netting, forms armored concrete spray-up.The presence of wire netting can be such that spray-up and lane wall is firmly combined together so that spray
Absciss layer is difficult between layer and country rock to come off, country rock self-supporting ability and the external support ability with spray-up is greatly enhanced.But
Be with regard to present circumstances from the point of view of, existing wire netting backboard installation procedure still suffers from some shortcomings, is in particular in：
（1）Wire netting backboard is installed between bow member and country rock, is not easy to the regular maintenance of workman, be increased workload.
（2）As the structure of wire netting backboard is inevitable and bow member is contacted a little, face contact, it is possible to so that bow member is subject to inequality
The load and eccentric load of even distribution.Reduce the bearing capacity of bow member.(3) wire netting belongs to flexible support material, rigidity
Little, amount of deflection is big, is placed between bow member and country rock in the presence of relatively stress is not haled, it is easy to deform, or even is damaged.
Threat is brought to the bearing capacity of whole support system.Therefore wire netting backboard installation procedure technique is improved for raising tunnel is applied
Work efficiency rate and supporting construction bearing capacity important in inhibiting.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of high stressed soft rock of backboard containing wire netting
Roadway support system and construction method, the construction method are based on the quantitative yield supporting structure of high stressed soft rock, improve original
Shield mode workload, reduction maintenance engineering amount.
For achieving the above object, the present invention adopts following technical proposals：
A kind of high stress and soft rock mine roadway support system containing wire netting backboard, its structure are followed successively by from inside to outside：Wire netting
Packing material and bolt-mesh-spurting supporting after backboard, confined concrete bow member, packing material block cloth, wall；The wire netting backboard is located at
The lower section of confined concrete bow member, connects between wire netting backboard and packing material block cloth；The confined concrete bow member outer rim
It is connected by prestress wire with the anchor pole of bolt-mesh-spurting supporting.
The confined concrete bow member includes left arch lower limb, and the left arch lower limb upper end passes through telescopic joint with the left chord of arch, described
The left chord of arch passes through telescopic joint with the right chord of arch, and the right chord of arch lower end passes through telescopic joint with right arch lower limb, and the left lower limb that encircles is with a left side
Chord of arch junction is provided with, and the left chord of arch and right chord of arch junction have, the right arch lower limb
It is provided with right chord of arch junction and quantitatively allow pressure device.
The wire netting backboard is to be arranged with equal pitch by longitudinal reinforcement and transverse steel respectively and mutually at a right angle, all
The metal mesh sheet that cross point welds together is spliced.
A kind of construction method of the high stress and soft rock mine roadway support system containing wire netting backboard, comprises the following steps：
Step 1：After excavation, just pneumatically placed concrete fills country rock crack immediately, closes country rock；
Step 2：Assembled confined concrete bow member from bottom to top, it is ensured that the confined concrete bow member after assembly meets design will
Summation tunnel use requirement；
Step 3：Prestress wire is sequentially passed through the hole of reeving reeved on hole and pallet on confined concrete bow member,
The continuous grids of W shapes are formed in confined concrete bow member outer rim and country rock surface, confined concrete bow member and anchor pole are connected
Come；
Step 4：Wire netting backboard is laid from top to bottom, net will be laid flat and straighten, and tense compacting；
Step 5：Packing material block cloth is laid from top to bottom, first from the beginning of vault, is then carried out downwards successively, is used thin wire
Packing material block cloth is connected with wire netting backboard；Packing material block cloth should be laid neat, tight；
Step 6：After wall fill before should will be various materials and equipment in place, construction filling cut-off, it is ensured that filler is not
Outwards trickle；
Step 7：After carrying out the monitoring of confined concrete bow member convergent deformation, the detection of confined concrete bow member radial force and wall
Filler load-bearing monitor.
The step 1 is concretely comprised the following steps：
Drilled using rock bolting jumbo, position is made according to design requirement before rockbolt installation, is made a mark, hole position allows slip casting
Deviation is positive and negative 15mm, is drilled round and straight, and boring direction is vertical with rock stratum primary structure by design requirement, is drilled hole grouting behind shaft or drift lining pipe
It is inserted at 5-10cm, slowly extracts with the injection of cement, immediately rapidly by body of rod patchhole, the length in body of rod patchhole is not
It is shorter than the 95% of design length.
The step 4 is concretely comprised the following steps：
The wire netting backboard laying of dome portions point is first carried out, is then constructed downwards, with using ferrum between two panels wire netting backboard
Silk colligation, at least three road of colligation, wire netting backboard should be laid neatly.
The wire netting backboard mesh sheet lap of splice must not be less than 100mm, and tying spacing is 200mm.
The step 5 tunnel axial direction and two fixed connection points of any wire netting backboard in ring direction and packing material block cloth
The distance between be less than 500mm.
The lap of splice between the step 5 two panels packing material block cloth is not less than 200mm.
The step 6 is carried out when filling from bottom to top, and obvious space should closely knit, be not stayed in filling.
The step 7 confined concrete bow member convergent deformation monitoring Vault settlement, two help convergence and the monitoring of bottom distension, using receipts
Hold back chi or survey rifle and be monitored.
The step 7 confined concrete bow member radial force monitoring carries out the radial direction at vault, spandrel, spring line and arch springing
Stress, is monitored using flat jack or pressure cell.
The step 7 support with backfilling material load-bearing monitor carries out the packing material of vault, spandrel, spring line suddenly at arch springing
Radially, axially or tangential stress is monitored, can select to be monitored using concrete stress meter or concrete strain gauge.
The present invention steel tube confined concrete bow member be in steel tube shell load coagulation local soil type into bow member, have bow member
Higher anti-pressure ability.Steel tube confined concrete support system has that intensity is high, rigidity is big, quantitatively allow pressure the characteristics of, it is adaptable to
Various deeps, complex conditions, structural belt, the roadway support oozed under the special geologic conditions such as retention of excessive fluid.
Beneficial effects of the present invention are：
By the position for changing wire netting backboard, drop except maintaining original effect to prevent and treat non-dry concrete, while tool
There are following these beneficial effects：
（1）Reduce workman's maintenance amount of labour；
（2）Wire netting backboard is placed on the downside of bow member, reduces wire netting back veneer material consumption；
（3）The change of wire netting tergal position so that bow member and the concrete material directly contact of filling, greatly increases arch
The contact point of frame and fill concrete so that bow member stress tends to uniform, realizes bow member-filling bed-country rock three common
Carry, improve bow member integer support performance, played the self-bearing ability of the bearing capacity and country rock of bow member, it is critical only that improvement
After relation between surrounding rock supporting, carry can bow member integrated carrying, rather than local, be conducive to the stability of supporting；
（4）Support system entirety bearing capacity is improved, and is conducive to being smoothed out for engineering, is the safety proposition of workman
Certain guarantee.
Description of the drawings
Fig. 1 is the paving location schematic diagram of wire netting backboard of the present invention；
Fig. 2 is the schematic diagram of the confined concrete bow member of the present invention；
Fig. 3 is construction flow chart of the present invention；
Fig. 4 is metal mesh sheet connection figure of the present invention；
In figure, 1 is left arch lower limb, and 2 is the left chord of arch, and 3 is the right chord of arch, and 4 is right arch lower limb, and 5 is wire netting backboard, and 6 are filling material
Material block cloth, 7 is prestress wire, and 8 is anchor pole, and 9 is support with backfilling material, and 10 is sleeve pipe, and 11 is to allow pressure node.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As Figure 1-Figure 2, the high stress and soft rock mine roadway support system containing wire netting backboard, its structure is from inside to outside successively
For：Packing material 9 and bolt-mesh-spurting supporting after wire netting backboard 5, confined concrete bow member, packing material block cloth 6, wall；Wire netting
Backboard 5 is located at the lower section of confined concrete bow member, connects between wire netting backboard 5 and packing material block cloth 6；Confined concrete encircles
Frame outer rim is connected by prestress wire with the anchor pole of bolt-mesh-spurting supporting.
Confined concrete bow member includes left arch lower limb 1, and left arch 1 upper end of lower limb is connected by sleeve pipe 10 with the left chord of arch 2, the left chord of arch 2
It is connected by sleeve pipe 10 with the right chord of arch 3,3 lower end of the right chord of arch is connected by sleeve pipe 10 with right arch lower limb 4, left arch lower limb 1 is connected with the left chord of arch 2
The place of connecing is provided with, and right arch lower limb 4 allows pressure node 11 to be provided with 3 junction of the right chord of arch and quantitatively allow pressure device.
As shown in figure 3, the construction method of the high stress and soft rock mine roadway support system containing wire netting backboard, construction process is：
Preparation of construction, roadway excavation, Bolt net and jet construction, assembled bow member, three-dimensional prestress wire construction, laying wire netting backboard, paving
If filling, Surrounding Rock Control effect analyses after packing material block cloth, wall.Wire netting backboard is placed on the downside of bow member, thus will be reduced
The material usage of wire netting backboard.In addition the concrete material of filling is directly carried out face contact with bow member, it is to avoid because of metal
Point contact and the bow member discontinuity caused by linear contact lay that net is caused, it is ensured that bow member receives evenly load, high-strength bearing capacity
Played, not only make packed layer play pressure and release energy effect, also fill part and transfer self, supporting and country rock are regarded as
Unified complex, it is contemplated that their collective effect.
High stress and soft rock mine roadway support system construction method containing wire netting backboard is concretely comprised the following steps：
Step one：Just spray 34cm Concrete Filled country rocks crack after excavation immediately, close country rock as early as possible.Using rock bolting jumbo
Drilling, anchor pole 8 make position according to design requirement before installing, and make a mark, and it is positive and negative 15mm that hole position allows slip casting deviation, is drilled
Round and straight, boring direction is vertical with rock stratum primary structure by design requirement, is drilled hole grouting behind shaft or drift lining pipe and is inserted at 5-10cm, with cement
Injection slowly extract, immediately rapidly by body of rod patchhole, the length in body of rod patchhole is not shorter than the 95% of design length.
Step 2：Assembled bow member from bottom to top, the bow member after assembly meet design requirement and tunnel use requirement.
Step 3：Prestress wire 7 sequentially passes through the hole of reeving reeved on hole and pallet on bow member, in bow member outer rim
The continuous grids of similar W shapes are formed with country rock surface, bow member and anchor pole are coupled together.
Step 4：Wire netting backboard 5 is from top to bottom laid, net will be laid flat and straighten, tense compacting.The portion of vault is carried out first
Point, then to construct downwards, the two panels wire netting lap of splice is not less than 100mm, lap-joint's 14# iron wire colligations, at least colligation three
Road, clasp spacing 200mm（When wire netting is laid, one can be tied up every 200mm iron wires per two panels wire netting and be buckled, make them
Couple together）, wire netting backboard 5 should lay neatly.The mesh sheet lap of splice is the overlap length of two panels wire netting.
Step 5：Packing material block cloth 6 is laid from top to bottom, first from the beginning of vault, is then carried out downwards successively, is used thin ferrum
Silk is filled with material block cloth 6 and is connected with wire netting backboard 5, tunnel axially with any two junction point in ring direction（Wire netting backboard
And the fixed connection point between packing material block cloth）The distance between be not to be exceeded 500mm；Between two panels packing material block cloth
The lap of splice（The overlap length of two panels block cloth lap in laying）Not less than 200mm.Packing material block cloth should be laid whole
Together, it is tight.
Step 6：After wall fill before should will be various materials and equipment in place, construction filling cut-off, it is ensured that filler 9
Outwards do not trickle.Carried out during filling from bottom to top, obvious space should closely knit, be not stayed in filling.
Step 7：Carry out bow member convergent deformation monitoring, the detection of bow member radial force and support with backfilling material load-bearing monitor.Arch
Frame convergent deformation monitoring be substantially carried out Vault settlement, two help convergence and bottom distension monitoring, using convergence chi or survey rifle be monitored.Arch
The monitoring of frame radial force is substantially carried out the radial force at vault, spandrel, spring line and arch springing, is entered using flat jack or pressure cell
Row monitoring.Support with backfilling material load-bearing monitor vault, spandrel, spring line packing material suddenly at arch springing radially, axially or is cut
It is monitored to stress, can selects to be monitored using concrete stress meter or concrete strain gauge.
As shown in figure 4, wire netting backboard 5 is respectively between certain by the longitudinal reinforcement and transverse steel of a diameter of 8mm
Away from arrangement（The a width of 100mm*100mm of long * are adopted herein）And mutually at a right angle, the wire netting that welds together of whole cross points
Piece is spliced.
The present invention will improve the safety and reliability of concrete filled steel tube bow member support system, for running smooth for engineering
It is significant with the maintenance after completion, with good social effect and economic benefits.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
The various modifications made by needing to pay creative work or deformation are still within protection scope of the present invention.
Claims (10)
1. a kind of high stress and soft rock mine roadway support system containing wire netting backboard, is characterized in that, its structure is followed successively by from inside to outside：
Packing material and bolt-mesh-spurting supporting after wire netting backboard, confined concrete bow member, packing material block cloth, wall；The wire netting back of the body
Plate is located at the lower section of confined concrete bow member, connects between wire netting backboard and packing material block cloth；The confined concrete arch
Frame outer rim is connected by prestress wire with the anchor pole of bolt-mesh-spurting supporting.
2. high stress and soft rock mine roadway support system as claimed in claim 1, is characterized in that, the confined concrete bow member includes
Left arch lower limb, the left arch lower limb upper end pass through telescopic joint with the left chord of arch, and the left chord of arch passes through telescopic joint with the right chord of arch, described
Right chord of arch lower end passes through telescopic joint with right arch lower limb, and the left arch lower limb is provided with left chord of arch junction and quantitatively allow pressure device, described
Right arch lower limb is provided with right chord of arch junction and quantitatively allow pressure device.
3. the construction method of the high stress and soft rock mine roadway support system as described in any one of claim 1-2, is characterized in that, including
Following steps：
Step 1：After excavation, just pneumatically placed concrete fills country rock crack immediately, closes country rock；
Step 2：Assembled confined concrete bow member from bottom to top, it is ensured that the confined concrete bow member after assembly meet design requirement and
Tunnel use requirement；
Step 3：Prestress wire is sequentially passed through the hole of reeving reeved on hole and pallet on confined concrete bow member, about
Beam concrete bow member outer rim and country rock surface form the continuous grids of W shapes, and confined concrete bow member and anchor pole are coupled together；
Step 4：Wire netting backboard is laid from top to bottom, net will be laid flat and straighten, and tense compacting；
Step 5：Packing material block cloth is laid from top to bottom, first from the beginning of vault, is then carried out downwards successively, will be filled out with thin wire
Fill material block cloth to be connected with wire netting backboard；Packing material block cloth should be laid neat, tight；
Step 6：After wall fill before should will be various materials and equipment in place, construction filling cut-off, it is ensured that filler is not outside
Trickling；
Step 7：Carry out the monitoring of confined concrete bow member convergent deformation, the detection of confined concrete bow member radial force and support with backfilling
Material load-bearing monitor.
4. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, is characterized in that, the step 1
Concretely comprise the following steps：
Drilled using rock bolting jumbo, position is made according to design requirement before rockbolt installation, is made a mark, hole position allows slip casting deviation
For positive and negative 15mm, drill round and straight, boring direction is vertical with rock stratum primary structure by design requirement, is drilled hole grouting behind shaft or drift lining pipe and is inserted into
At 5-10cm, slowly extract with the injection of cement, immediately rapidly by body of rod patchhole, the length in body of rod patchhole is not shorter than
The 95% of design length.
5. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, is characterized in that, the step 4
Concretely comprise the following steps：
The wire netting backboard laying of dome portions point is first carried out, is then constructed downwards, between two panels wire netting backboard, is used iron wire colligation,
At least three road of colligation, wire netting backboard should be laid neatly.
6. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, is characterized in that, the wire netting back of the body
Expanded metals oblique cut grafting length must not be less than 100mm, and tying spacing is 200mm.
7. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, is characterized in that, step 5 lane
The distance between two fixed connection points of road axial direction and any wire netting backboard in ring direction and packing material block cloth are less than
500mm。
8. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, is characterized in that, the step 5 liang
The lap of splice between piece packing material block cloth is not less than 200mm.
9. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, is characterized in that, the step 6 is filled
Carried out when filling out from bottom to top, obvious space should closely knit, be not stayed in filling.
10. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, is characterized in that, the step 7 is about
Beam concrete bow member convergent deformation monitoring Vault settlement, two help convergence and the monitoring of bottom distension, are monitored using convergence chi or survey rifle；
The step 7 confined concrete bow member radial force monitoring carries out the radial force at vault, spandrel, spring line and arch springing, adopts
It is monitored with flat jack or pressure cell；The step 7 support with backfilling material load-bearing monitor carries out vault, spandrel, spring line and neglects
So the packing material at arch springing is radially, axially or tangential stress is monitored.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510159243.4A CN104832187B (en) | 2015-04-03 | 2015-04-03 | A kind of high stress and soft rock mine roadway support system containing wire netting backboard and construction method |
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| CN201510159243.4A CN104832187B (en) | 2015-04-03 | 2015-04-03 | A kind of high stress and soft rock mine roadway support system containing wire netting backboard and construction method |
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| CN107676111A (en) * | 2017-10-23 | 2018-02-09 | 洛阳坤宇矿业有限公司 | A kind of method for protecting support for the prefabricated steel bracket of well lane engineering |
| CN112879049B (en) * | 2021-01-19 | 2022-08-30 | 华北理工大学 | Arch yielding energy dissipation node connecting structure, arch and construction method |
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