CN104832187A - High-stress soft rock roadway supporting system with metal mesh backplane and construction method - Google Patents
High-stress soft rock roadway supporting system with metal mesh backplane and construction method Download PDFInfo
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- CN104832187A CN104832187A CN201510159243.4A CN201510159243A CN104832187A CN 104832187 A CN104832187 A CN 104832187A CN 201510159243 A CN201510159243 A CN 201510159243A CN 104832187 A CN104832187 A CN 104832187A
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- arch
- backboard
- bow member
- confined concrete
- wire lath
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Abstract
The invention discloses a high-stress soft rock roadway supporting system with a metal mesh backplane and a construction method. The system sequentially comprises the metal mesh backplane, a confined concrete arch, a filling material blocking cloth, a backwall filling material and a bolt-mesh-spurting support from inside to outside, wherein the metal mesh backplane is located below the confined concrete arch; the metal mesh backplane is connected with the filling material blocking cloth; and the outer edge of the confined concrete arch is connected with the bolt of the bolt-mesh-spurting support via a pre-stressed steel strand. The high-stress soft rock roadway supporting system with the metal mesh backplane has the beneficial effects that the metal mesh backplane is located at the lower side of the arch, thereby reducing the material use amount of the metal mesh backplane; the position of the metal mesh backplane changes, the arch is directly contacted with the filled concrete material, force borne by the arch tends to be uniform, the force is together borne by the arch, the filling layer and the surrounding rock, the overall supporting performance of the arch is improved, the bearing ability of the arch and the self-bearing ability of the surrounding rock are used, and stability of the support is facilitated.
Description
Technical field
The present invention relates to a kind of support system and construction method of containing metal net backboard tunnel, particularly relate to one and determine high stress and soft rock mine roadway support system wire lath backboard installation site constructure scheme.
Background technology
In recent years, bolt-spary supports is at home and abroad used widely.In roadway with large deformation, use at present the subject matter of bolt-spary supports to be that the flexibility of spray-up and anchor pole is not mated very much, under surrouding rock deformation and concussion of blasting effect, spray-up premature rupture lost efficacy, lose the condition coefficient with anchor pole, country rock performance is caused constantly to worsen, country rock and concrete fall block successively, and serious causes roof fall and side falling accident.In order to avoid spray-up premature rupture, one of them effective method lays wire lath at concrete, forms steel concrete spray-up.The existence of wire lath can make spray-up and lane wall firmly combine, and to make between spray-up and country rock not easily absciss layer come off, and greatly improves country rock self-supporting ability and and the external support ability of spray-up.But with regard to present circumstances, still there are some shortcomings in existing wire lath backboard installation procedure, is in particular in:
(1) wire lath backboard is installed between bow member and country rock, is not easy to the regular maintenance of workman, adds workload.(2) due to the structure of wire lath backboard inevitably have point cantact with bow member, face contacts, and likely makes bow member be subject to point load and the eccentric load of uneven distribution.Reduce the bearing capacity of bow member.(3) wire lath belongs to flexible support material, and rigidity is little, and amount of deflection is large, to be placed between bow member and country rock under the effect of comparatively not haling stress, to be easy to distortion, even to be damaged.Threat is brought to the bearing capacity of whole support system.Therefore wire lath backboard installation procedure technique is improved for raising roadway construction efficiency and supporting and protection structure bearing capacity important in inhibiting.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of containing metal net backboard high stress and soft rock mine roadway support system and construction method are provided, this construction method, based on the quantitative yield supporting structure of high stressed soft rock, is improved original support pattern workload, is reduced maintenance engineering amount.
For achieving the above object, the present invention adopts following technical proposals:
A high stress and soft rock mine roadway support system for containing metal net backboard, its structure is followed successively by from inside to outside: packing material and bolt-mesh-spurting supporting after wire lath backboard, confined concrete bow member, packing material block cloth, wall; Described wire lath backboard is positioned at the below of confined concrete bow member, is connected between wire lath backboard with packing material block cloth; Described confined concrete bow member outer rim is connected by prestress wire with the anchor pole of bolt-mesh-spurting supporting.
Described confined concrete bow member comprises left arch leg, described left arch leg upper end is connected by sleeve pipe with the left chord of arch, the described left chord of arch is connected by sleeve pipe with the right chord of arch, described right chord of arch lower end is connected by sleeve pipe with right arch leg, described left arch leg and left chord of arch junction are provided with and quantitatively allow pressure device, the described left chord of arch and right chord of arch junction have quantitatively allows pressure device, described right arch leg and right chord of arch junction be provided with quantitatively to allow pressure device.
Described wire lath backboard be arranged with equal pitch respectively by longitudinal reinforcement and transverse reinforcement and be mutually that right angle, all crosspoint all weld together metal mesh sheet be spliced.
A construction method for the high stress and soft rock mine roadway support system of containing metal net 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, ensure assembled after confined concrete bow member to meet design requirement and tunnel instructions for use;
Step 3: by prestress wire successively through the hole of reeving of reeving on hole and pallet on confined concrete bow member, forms the continuous grids of W shape, confined concrete bow member and anchor pole is coupled together in confined concrete bow member outer rim and country rock surface;
Step 4: lay wire lath backboard from top to bottom, net will be set level and straighten, tension compacting;
Step 5: lay packing material block cloth from top to bottom, first from vault, then carries out downwards successively, packing material block cloth is connected with wire lath backboard with thin wire; Filler block cloth should be laid neat, tight;
Step 6: after wall fill before should by various material and equipment in place, construction filling cut off, ensure filler outwards do not trickle;
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.
The concrete steps of described step 1 are:
Employing rock bolting jumbo is holed, position is made according to designing requirement before rockbolt installation, make a mark, position, hole allows slip casting deviation to be positive and negative 15mm, and boring is round and directly, boring direction is vertical with rock stratum primary structure by designing requirement, bore hole grouting behind shaft or drift lining pipe and be inserted into 5-10cm place, injection with cement is slowly extracted, and rapid in body of rod patchhole immediately, the length in body of rod patchhole is not shorter than 95% of design length.
The concrete steps of described step 4 are:
First carry out the wire lath backboard laying that dome portions is divided, then construct downwards, use iron wire colligation between two panels wire lath backboard, at least colligation three road, wire lath backboard should be laid neatly.
Described wire lath backboard mesh sheet lap length must not lower than 100mm, and tying spacing is 200mm.
Distance between any wire lath backboard of described step 5 tunnel axis and hoop direction and two fixed connection points of packing material block cloth is no more than 500mm.
Lap length between described step 5 two panels filler block cloth is not less than 200mm.
Carry out from bottom to top during described step 6 filling, filling should closely knit, not stay obvious space.
Described step 7 confined concrete bow member convergent deformation monitoring Vault settlement, two helps convergence and the monitoring of end distension, adopts convergence chi or surveys rifle and monitor.
The radial force at vault, spandrel, springing line and arch springing place is carried out in the monitoring of described step 7 confined concrete bow member radial force, adopts flat jack or pressure cell to monitor.
Described step 7 support with backfilling material load-bearing monitor carries out that the packing material at vault, spandrel, springing line arch springing place is suddenly radial, axis or shear stress are monitored, and can choice for use concrete stress meter or concrete strain meter monitor.
Steel tube confined concrete bow member of the present invention is the bow member loading concrete composition in steel tube shell, makes bow member have stronger anti-pressure ability.The feature that steel tube confined concrete support system has that intensity is high, rigidity greatly, quantitatively allows pressure, is applicable to various deep, complex conditions, structural belt, the roadway support of oozing under the special geologic conditions such as water burst.
Beneficial effect of the present invention is:
By changing the position of wire lath backboard, namely preventing and treating non-dry concrete drop except maintaining original effect, there are these beneficial effects following simultaneously:
(1) reduce workman and keep in repair the amount of labour;
(2) wire lath backboard is placed on the downside of bow member, reduces wire lath back veneer material consumption;
(3) change of wire lath tergal position, bow member is directly contacted with the concrete material of filling, greatly increase the contact point of bow member and fill concrete, make that bow member is stressed is tending towards even, achieve bow member-filling bed-country rock three jointly to carry, improve bow member integer support performance, the supporting capacity of bow member and the self-bearing ability of country rock are played, after key is to improve the relation between surrounding rock supporting, bow member integrated carrying can be made, instead of local carrying, be conducive to the stability of supporting;
(4) the overall bearing capacity of support system improves, and be conducive to carrying out smoothly of engineering, the safety for workman proposes certain guarantee.
Accompanying drawing explanation
Fig. 1 is the paving location schematic diagram of wire lath backboard of the present invention;
Fig. 2 is the schematic diagram of 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 layout of the present invention;
In figure, 1 is left arch leg, and 2 is the left chord of arch, and 3 is the right chord of arch, and 4 is right arch leg, and 5 is wire lath backboard, and 6 is packing material block cloth, and 7 is prestress wire, and 8 is anchor pole, and 9 is support with backfilling material, and 10 is sleeve pipe, and 11 for allowing pressure node.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
As Figure 1-Figure 2, the high stress and soft rock mine roadway support system of containing metal net backboard, its structure is followed successively by from inside to outside: packing material 9 and bolt-mesh-spurting supporting after wire lath backboard 5, confined concrete bow member, packing material block cloth 6, wall; Wire lath backboard 5 is positioned at the below of confined concrete bow member, is connected between wire lath backboard 5 with packing material block cloth 6; Confined concrete bow member outer rim is connected by prestress wire with the anchor pole of bolt-mesh-spurting supporting.
Confined concrete bow member comprises left arch leg 1, left arch leg 1 upper end is connected by sleeve pipe 10 with the left chord of arch 2, the left chord of arch 2 is connected by sleeve pipe 10 with the right chord of arch 3, the right chord of arch 3 lower end is connected by sleeve pipe 10 with right arch leg 4, left arch leg 1 and the left chord of arch 2 junction are provided with quantitatively to allow pressure device, right arch leg 4 and the right chord of arch 3 junction allow to press node 11 to be provided with and quantitatively allow pressure device.
As shown in Figure 3, the construction method of the high stress and soft rock mine roadway support system of containing metal net backboard, construction process is: filling after preparation of construction, roadway excavation, Bolt net and jet construction, the construction of assembled bow member, three-dimensional prestress wire, laying wire lath backboard, laying packing material block cloth, wall, Surrounding Rock Control effect analysis.Wire lath backboard will be placed on the downside of bow member, will reduce the material usage of wire lath backboard thus.The concrete material of filling in addition contacts directly carrying out face with bow member, avoid the point cantact because wire lath causes and the bow member discontinuity caused by linear contact lay, ensure that bow member is subject to evenly distributed load, high-strength bearing capacity is played, not only make packed layer play all pressures and release energy effect, also fill part and transfer self, supporting and country rock are regarded as unified complex, take into account their acting in conjunction.
The concrete steps of the high stress and soft rock mine roadway support system construction method of containing metal net backboard are:
Step one: just spray 34cm Concrete Filled country rock crack immediately after excavation, closes country rock as early as possible.Employing rock bolting jumbo is holed, anchor pole 8 makes position according to designing requirement before installing, make a mark, position, hole allows slip casting deviation to be positive and negative 15mm, and boring is round and directly, boring direction is vertical with rock stratum primary structure by designing requirement, bore hole grouting behind shaft or drift lining pipe and be inserted into 5-10cm place, injection with cement is slowly extracted, and rapid in body of rod patchhole immediately, the length in body of rod patchhole is not shorter than 95% of design length.
Step 2: assembled bow member from bottom to top, the bow member after assembled meets design requirement and tunnel instructions for use.
Step 3: prestress wire 7, successively through the hole of reeving of reeving on hole and pallet on bow member, forms the continuous grids of similar W shape, bow member and anchor pole coupled together in bow member outer rim and country rock surface.
Step 4: lay wire lath backboard 5 from top to bottom, net will be set level and straighten, tension compacting.First carry out the part of vault, then construct downwards, two panels wire lath lap length is not less than 100mm, lap-joint's 14# iron wire colligation, at least colligation three road, clasp spacing 200mm (when laying wire lath, can tie up one every 200mm iron wire and buckle by every two panels wire lath, them are made to couple together), wire lath backboard 5 should be laid neatly.The overlap length of mesh sheet lap length and two panels wire lath.
Step 5: lay packing material block cloth 6 from top to bottom, first from vault, then carry out downwards successively, be connected with wire lath backboard 5 with regard to packing material block cloth 6 with thin wire, the distance of tunnel axially and between any two tie points in hoop direction (fixed connection point between wire lath backboard and packing material block cloth) should more than 500mm; Lap length (overlap length of two panels block cloth lap when laying) between two panels filler block cloth is not less than 200mm.Filler block cloth should be laid neat, tight.
Step 6: after wall fill before should by various material and equipment in place, construction filling cut off, ensure filler 9 outwards do not trickle.Carry out from bottom to top during filling, filling should closely knit, not stay obvious space.
Step 7: carry out the monitoring of bow member convergent deformation, bow member radial force detects and support with backfilling material load-bearing monitor.The monitoring of bow member convergent deformation is mainly carried out Vault settlement, two and is helped convergence and the monitoring of end distension, adopts convergence chi or surveys rifle and monitor.The radial force at vault, spandrel, springing line and arch springing place is mainly carried out in the monitoring of bow member radial force, adopts flat jack or pressure cell to monitor.The packing material at support with backfilling material load-bearing monitor vault, spandrel, springing line arch springing place is suddenly radial, axis or shear stress are monitored, and can choice for use concrete stress meter or concrete strain meter monitor.
As shown in Figure 4, wire lath backboard 5 be that the longitudinal reinforcement of 8mm and transverse reinforcement arrange (adopting long * wide for 100mm*100mm) herein with certain spacing respectively by diameter and be mutually that right angle, all crosspoint all weld together metal mesh sheet be spliced.
The present invention will improve the safety and reliability of concrete filled steel tube bow member support system, for engineering run smooth and maintenance after being completed significant, there are good social effect and economic benefits.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. a high stress and soft rock mine roadway support system for containing metal net backboard, is characterized in that, its structure is followed successively by from inside to outside: packing material and bolt-mesh-spurting supporting after wire lath backboard, confined concrete bow member, packing material block cloth, wall; Described wire lath backboard is positioned at the below of confined concrete bow member, is connected between wire lath backboard with packing material block cloth; Described confined concrete bow member 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, it is characterized in that, described confined concrete bow member comprises left arch leg, described left arch leg upper end is connected by sleeve pipe with the left chord of arch, the described left chord of arch is connected by sleeve pipe with the right chord of arch, described right chord of arch lower end is connected by sleeve pipe with right arch leg, and described left arch leg and left chord of arch junction are provided with and quantitatively allow pressure device, described right arch leg and right chord of arch junction be provided with quantitatively to allow pressure device.
3. a construction method for the high stress and soft rock mine roadway support system of containing metal net backboard, is characterized in that, comprise 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, ensure assembled after confined concrete bow member to meet design requirement and tunnel instructions for use;
Step 3: by prestress wire successively through the hole of reeving of reeving on hole and pallet on confined concrete bow member, forms the continuous grids of W shape, confined concrete bow member and anchor pole is coupled together in confined concrete bow member outer rim and country rock surface;
Step 4: lay wire lath backboard from top to bottom, net will be set level and straighten, tension compacting;
Step 5: lay packing material block cloth from top to bottom, first from vault, then carries out downwards successively, packing material block cloth is connected with wire lath backboard with thin wire; Filler block cloth should be laid neat, tight;
Step 6: after wall fill before should by various material and equipment in place, construction filling cut off, ensure filler outwards do not trickle;
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, it is characterized in that, the concrete steps of described step 1 are:
Employing rock bolting jumbo is holed, position is made according to designing requirement before rockbolt installation, make a mark, position, hole allows slip casting deviation to be positive and negative 15mm, and boring is round and directly, boring direction is vertical with rock stratum primary structure by designing requirement, bore hole grouting behind shaft or drift lining pipe and be inserted into 5-10cm place, injection with cement is slowly extracted, and rapid in body of rod patchhole immediately, the length in body of rod patchhole is not shorter than 95% of design length.
5. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, it is characterized in that, the concrete steps of described step 4 are:
First carry out the wire lath backboard laying that dome portions is divided, then construct downwards, use iron wire colligation between two panels wire lath backboard, at least colligation three road, wire lath backboard should be laid neatly.
6. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, it is characterized in that, described wire lath backboard mesh sheet lap length must not lower 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, it is characterized in that, the distance between any wire lath backboard of described step 5 tunnel axis and hoop direction and two fixed connection points of packing material block cloth is no more than 500mm.
8. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, it is characterized in that, the lap length between described step 5 two panels filler 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, it is characterized in that, carry out from bottom to top during described step 6 filling, filling should closely knit, not stay obvious space.
10. the construction method of high stress and soft rock mine roadway support system as claimed in claim 3, is characterized in that, described step 7 confined concrete bow member convergent deformation monitoring Vault settlement, two helps convergence and the monitoring of end distension, adopts convergence chi or surveys rifle and monitor; The radial force at vault, spandrel, springing line and arch springing place is carried out in the monitoring of described step 7 confined concrete bow member radial force, adopts flat jack or pressure cell to monitor; Described step 7 support with backfilling material load-bearing monitor carries out that the packing material at vault, spandrel, springing line arch springing place is suddenly radial, axis or shear stress are monitored.
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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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| CN112879049A (en) * | 2021-01-19 | 2021-06-01 | 华北理工大学 | Arch yielding energy dissipation node connecting structure, arch and construction method |
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| CN104832187B (en) | 2017-03-29 |
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