CN104453936A - Roadway surrounding rock geogrid construction method - Google Patents
Roadway surrounding rock geogrid construction method Download PDFInfo
- Publication number
- CN104453936A CN104453936A CN201410747467.2A CN201410747467A CN104453936A CN 104453936 A CN104453936 A CN 104453936A CN 201410747467 A CN201410747467 A CN 201410747467A CN 104453936 A CN104453936 A CN 104453936A
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- Prior art keywords
- grid
- geo
- surrounding rock
- support top
- roadway surrounding
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- 239000011435 rock Substances 0.000 title claims abstract description 66
- 238000010276 construction Methods 0.000 title claims abstract description 34
- 230000008093 supporting effect Effects 0.000 claims abstract description 33
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 26
- 239000004677 Nylon Substances 0.000 claims description 11
- 229920001778 nylon Polymers 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 10
- 238000009412 basement excavation Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 230000002787 reinforcement Effects 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a roadway surrounding rock geogrid construction method and belongs to the field of roadway surrounding rock supporting. The roadway surrounding rock geogrid construction method includes: firstly, performing anchor bolt hole position arrangement; secondly, preparing equipment and materials; thirdly, enabling geogrids to be in place and laying first geogrids; fourthly, mounting anchor bolts; fifthly, laying second geogrids; sixthly, overlapping the geogrids; finally, completing single anchor bolt-geogrid support technology prior to repeating the steps until the whole roadway surrounding rock anchor bolt-geogrid support technology is completed. The roadway surrounding rock geogrid construction method has the advantages that metal meshes can be substituted to achieve required supporting intensity of surrounding rock supporting, and existing geogrid construction methods are also improved, so that the 'anchor bolt plus geogrid' support technology is normalized more effectively, the problems of wastes, difficulty in construction and the like in traditional 'anchor bolt plus steel mesh reinforcement' supporting as well as the problem of the unreasonable construction technology in existing 'anchor bolt plus geogrid' supporting are solved, anchor mesh support progress is accelerated and supporting effect is improved.
Description
Technical field
The invention belongs to supporting roadway surrounding rock field, be specifically related to a kind of roadway surrounding rock geo-grid construction method.
Background technology
Due to the impact of country rock selfweight stress and geostatic stress after roadway excavation, country rock internal stress can redistribute along with the effect of extraneous stress, roadway surrounding rock inside has the existence of non-homogeneous stress in the process, and the inequality extent of surrouding rock stress can be larger when running into the unfavorable geological condition such as tomography, zone of fracture, as carried out bolting with wire mesh to country rock not in time, the unbalanced distribution of surrouding rock stress can be caused and then cause wall rock destabilization to destroy.The surrounding rock supporting form that tradition tunnel adopts is generally " anchor pole+steel mesh reinforcement " supporting, although this support form plays a role to surrounding rock stability and supporting effect, but due to construction and technical problems such as steel mesh reinforcement lap length are large, spillage of material is large, difficulty of construction is strong, transport difficulty is large, cause obstacle to a certain extent to the labour intensity of tunnel duration and workman.In recent years, geo-grid with its special mechanics supporting effect and easily application operability progressively replace steel mesh reinforcement to be used for supporting roadway surrounding rock field, and there is practical application effect widely.But the time being used for supporting roadway surrounding rock field due to geo-grid is shorter, in practice of construction process, the more complete grid construction technology of a set of ratio is not used for execute-in-place, although geo-grid replaces steel mesh reinforcement tool in roadway construction process to have an enormous advantage, but owing to lacking the construction technology of efficient, grid supporting can not reach the desirable supporting effect of expection.
Summary of the invention
In order to overcome in tradition " anchor pole+steel mesh reinforcement " supporting irrational construction technology problem in the problem such as waste material, difficulty of construction and existing " anchor pole+geo-grid " supporting, the present invention proposes a kind of roadway surrounding rock geo-grid construction method, the method can not only replace wire lath to reach supporting intensity needed for surrounding rock supporting, also improve existing geo-grid construction method simultaneously, make " anchor pole+geo-grid " support process have more normalization, improve bolting with wire mesh process and supporting effect.
To achieve these goals, the present invention adopts following technical scheme:
A kind of roadway surrounding rock geo-grid construction method,
Equipment comprises: grid support top steelframe, nylon cable tie, anchor pole, equipment of punchinging, geo-grid, geo-grid rib tape and luoyang spade or rig;
Described grid support top steelframe comprises the first arc support top steelframe and the second arc support top steelframe;
Described geo-grid comprises the first geo-grid and the second geo-grid, be along tunnel axis direction at top, tunnel form the both sides of geo-grid;
Utilize the roadway surrounding rock geo-grid construction method of above equipment, comprise the following steps:
Step 1: anchor pole arrangement of boring holes
Adopt luoyang spade or rig according to wall rock geology situation and the hole depth of roadway excavation patten's design bolthole position, the inclination angle in hole and aperture, position by the bolthole position of design, mark the particular location of bolthole position, carry out anchor pole arrangement of boring holes with the equipment of punchinging in pre-set position;
Step 2: equipment and material are equipped with
Geo-grid is arranged in the location needing to carry out surrounding rock supporting, stationary grizzly support top steelframe, the width of cutting geo-grid and length;
Step 3: in place and the first geo-grid of geo-grid is laid
With grid support top steelframe by jack-up in the middle part of geo-grid, the second geo-grid is propped with the second arc support top steelframe of grid support top steelframe, make it unsettled, then erecting the first geo-grid with the first arc support top steelframe of grid support top steelframe, needing fixing position, the first geo-grid being attached on roadway surrounding rock inwall;
Step 4: rockbolt installation
Carry out rockbolt installation according to the bolthole position arranged in advance and designing requirement, anchor rod pallet board should be arranged near grid node place or grid rib tape during skyhook as far as possible, and according to method of operating from top to bottom, upper strata, middle level, lower floor's anchor pole be installed successively;
Step 5: the second geo-grid is laid
First the first geo-grid propped with the first arc support top steelframe of grid support top steelframe is regained, then the second geo-grid is erected with the second arc support top steelframe of grid support top steelframe, needing fixing position to be attached on roadway surrounding rock inwall by the second geo-grid, finally carry out rockbolt installation;
Step 6: geo-grid overlap joint process
After having laid first geo-grid, repeat step 1, step 2, step 3, adopt two rib tape of the adjacent geo-grid of nylon cable tie colligation in two panels geo-grid lap-joint, carry out step 4, step 5 after technology for binding completes, until full wafer geo-grid is fixed on roadway surrounding rock inwall;
Step 7: circulation technology
Single anchor pole geo-grid support process completes, and repeats above-mentioned steps 1 afterwards to step 6, until whole roadway surrounding rock anchor pole geo-grid support process completes.
Preferably, in step 1, the spacing of described bolthole position is generally 70cm ~ 120cm, and country rock better location bolthole column pitch can be arranged as 150cm.
Preferably, in step 2, the width of described geo-grid is cut to 1.5m ~ 2.0m, and the length of geo-grid is cut to equal with the girth of country rock section.
Preferably, in step 6, the overlap joint overlap length of described two panels geo-grid is 10cm ~ 15cm, or overlap joint overlap length is a geo-grid grid size.
The Advantageous Effects that the present invention brings:
The present invention proposes a kind of roadway surrounding rock geo-grid construction method, compared with prior art, the monolithic area that the present invention lays geo-grid mesh sheet is large, and lap-joint is few, effectively utilizes area large.Being generally used for supporting roadway surrounding rock steel mesh reinforcement area is 1m × 2m, lap-joint's length is not less than 20cm, when therefore adopting steel mesh reinforcement to carry out country rock bolting with wire mesh, the utilization rate of steel mesh reinforcement is only 80%, and when adopting geo-grid to carry out supporting to roadway surrounding rock, because supporting method involved in the present invention can carry out tunneling boring disposable " anchor pole+geo-grid " supporting when country rock section allows, the utilization rate of grid can reach 100%, compared to the deficiency of traditional metal mesh supporting and existing grid support process, tool has an enormous advantage.In addition, construction method involved in the present invention, overlap quantity between grid and grid in " anchor pole+geo-grid " supporting few, so not only ensure that the use amount reducing unnecessary anchor pole when constant to supporting roadway surrounding rock intensity, shorten the construction period simultaneously.
Grid lap-joint in " anchor pole+geo-grid " Bracing Process adopts nylon cable tie to carry out overlap joint and processes, and because nylon cable tie has very strong tensile strength, when being that grid rib tape carries out colligation, can give full play to the respective advantage of itself and grid rib tape.Simultaneously construction convenience involved in the present invention is also embodied on the technology for binding of nylon cable tie, nylon cable tie in construction and the convenience of carrying, for the quick propelling of " anchor pole+geo-grid " supporting provides necessary condition.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of a kind of roadway surrounding rock geo-grid of the present invention construction method.
Fig. 2 is the working drawing of geo-grid installation technics on country rock involved in the present invention.
Fig. 3 is the treatment measures figure of geo-grid involved in the present invention and adjacent grid lap-joint.
Wherein, 1-geo-grid node; 2-geo-grid rib tape; 3-geo-grid grid; 4-nylon cable tie; 5-anchor pole.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail:
Shown in composition graphs 1, a kind of roadway surrounding rock geo-grid construction method,
Equipment comprises: grid support top steelframe, nylon cable tie, anchor pole, equipment of punchinging, geo-grid, geo-grid rib tape and luoyang spade or rig;
Described grid support top steelframe comprises the first arc support top steelframe and the second arc support top steelframe;
Described geo-grid comprises the first geo-grid and the second geo-grid, be along tunnel axis direction at top, tunnel form the both sides of geo-grid;
Utilize the roadway surrounding rock geo-grid construction method of above equipment, comprise the following steps:
Step 1: anchor pole arrangement of boring holes
Adopt luoyang spade or rig according to wall rock geology situation and the hole depth of roadway excavation patten's design bolthole position, the inclination angle in hole and aperture, position by the bolthole position of design, mark the particular location of bolthole position, carry out anchor pole arrangement of boring holes with the equipment of punchinging in pre-set position; The spacing of described bolthole position is generally 70cm ~ 120cm, and country rock better location bolthole column pitch can be arranged as 150cm;
Step 2: equipment and material are equipped with
Geo-grid is arranged in the location needing to carry out surrounding rock supporting, stationary grizzly support top steelframe, is cut into the width of applicable operations specifications by geo-grid, preferred 1.5m ~ 2.0m, and the length equal with country rock section girth;
Step 3: in place and the first geo-grid of geo-grid lays (as shown in Figure 2)
With grid support top steelframe by jack-up in the middle part of geo-grid, the second geo-grid is propped with the second arc support top steelframe of grid support top steelframe, make it unsettled, then erecting the first geo-grid with the first arc support top steelframe of grid support top steelframe, needing fixing position, the first geo-grid being attached on roadway surrounding rock inwall; The method that the laying of described first geo-grid adopts whole tunneling boring of throwing the net to lay carries out surrounding rock supporting, and adopts the method laid successively to both sides from top, tunnel;
Step 4: rockbolt installation
Carry out rockbolt installation according to the bolthole position arranged in advance and designing requirement, anchor rod pallet board should be arranged near grid node place or grid rib tape during skyhook as far as possible, and according to method of operating from top to bottom, upper strata, middle level, lower floor's anchor pole be installed successively;
Step 5: the second geo-grid lays (as shown in Figure 2)
First the first geo-grid propped with the first arc support top steelframe of grid support top steelframe is regained, then the second geo-grid is erected with the second arc support top steelframe of grid support top steelframe, needing fixing position to be attached on roadway surrounding rock inwall by the second geo-grid, finally carry out rockbolt installation; The method that the laying of described first geo-grid adopts whole tunneling boring of throwing the net to lay carries out surrounding rock supporting, and adopts the method laid successively to both sides from top, tunnel;
Step 6: geo-grid overlap joint process (as shown in Figure 3)
After having laid first geo-grid, repeat step 1, step 2, step 3, adopt two rib tape of the adjacent geo-grid of nylon cable tie colligation in two panels geo-grid lap-joint, carry out step 4, step 5 after technology for binding completes, until full wafer geo-grid is fixed on roadway surrounding rock inwall; The overlap joint overlap length of described two panels geo-grid is 10cm ~ 15cm, or overlap joint overlap length is a geo-grid grid size;
Step 7: circulation technology
Single anchor pole geo-grid support process completes, and repeats above-mentioned steps 1 afterwards to step 6, until whole roadway surrounding rock anchor pole geo-grid support process completes.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-mentioned citing, and the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (4)
1. a roadway surrounding rock geo-grid construction method, is characterized in that:
Equipment comprises: grid support top steelframe, nylon cable tie, anchor pole, equipment of punchinging, geo-grid, geo-grid rib tape and luoyang spade or rig;
Described grid support top steelframe comprises the first arc support top steelframe and the second arc support top steelframe;
Described geo-grid comprises the first geo-grid and the second geo-grid, be along tunnel axis direction at top, tunnel form the both sides of geo-grid;
Utilize the roadway surrounding rock geo-grid construction method of above equipment, comprise the following steps:
Step 1: anchor pole arrangement of boring holes
Adopt luoyang spade or rig according to wall rock geology situation and the hole depth of roadway excavation patten's design bolthole position, the inclination angle in hole and aperture, position by the bolthole position of design, mark the particular location of bolthole position, carry out anchor pole arrangement of boring holes with the equipment of punchinging in pre-set position;
Step 2: equipment and material are equipped with
Geo-grid is arranged in the location needing to carry out surrounding rock supporting, stationary grizzly support top steelframe, the width of cutting geo-grid and length;
Step 3: in place and the first geo-grid of geo-grid is laid
With grid support top steelframe by jack-up in the middle part of geo-grid, the second geo-grid is propped with the second arc support top steelframe of grid support top steelframe, make it unsettled, then erecting the first geo-grid with the first arc support top steelframe of grid support top steelframe, needing fixing position, the first geo-grid being attached on roadway surrounding rock inwall;
Step 4: rockbolt installation
Carry out rockbolt installation according to the bolthole position arranged in advance and designing requirement, anchor rod pallet board should be arranged near grid node place or grid rib tape during skyhook as far as possible, and according to method of operating from top to bottom, upper strata, middle level, lower floor's anchor pole be installed successively;
Step 5: the second geo-grid is laid
First the first geo-grid propped with the first arc support top steelframe of grid support top steelframe is regained, then the second geo-grid is erected with the second arc support top steelframe of grid support top steelframe, needing fixing position to be attached on roadway surrounding rock inwall by the second geo-grid, finally carry out rockbolt installation;
Step 6: geo-grid overlap joint process
After having laid first geo-grid, repeat step 1, step 2, step 3, adopt two rib tape of the adjacent geo-grid of nylon cable tie colligation in two panels geo-grid lap-joint, carry out step 4, step 5 after technology for binding completes, until full wafer geo-grid is fixed on roadway surrounding rock inwall;
Step 7: circulation technology
Single anchor pole geo-grid support process completes, and repeats above-mentioned steps 1 afterwards to step 6, until whole roadway surrounding rock anchor pole geo-grid support process completes.
2. roadway surrounding rock geo-grid construction method according to claim 1, is characterized in that: in step 1, and the spacing of described bolthole position is generally 70cm ~ 120cm, and country rock better location bolthole column pitch can be arranged as 150cm.
3. roadway surrounding rock geo-grid construction method according to claim 1, it is characterized in that: in step 2, the width of described geo-grid is cut to 1.5m ~ 2.0m, and the length of geo-grid is cut to equal with the girth of country rock section.
4. roadway surrounding rock geo-grid construction method according to claim 1, is characterized in that: in step 6, and the overlap joint overlap length of described two panels geo-grid is 10cm ~ 15cm, or overlap joint overlap length is a geo-grid grid size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410747467.2A CN104453936A (en) | 2014-12-09 | 2014-12-09 | Roadway surrounding rock geogrid construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410747467.2A CN104453936A (en) | 2014-12-09 | 2014-12-09 | Roadway surrounding rock geogrid construction method |
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| Publication Number | Publication Date |
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| CN104453936A true CN104453936A (en) | 2015-03-25 |
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| CN201410747467.2A Pending CN104453936A (en) | 2014-12-09 | 2014-12-09 | Roadway surrounding rock geogrid construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110685721A (en) * | 2019-11-20 | 2020-01-14 | 张军贤 | Jet-anchored net hanging construction method for roadway surrounding rock support |
-
2014
- 2014-12-09 CN CN201410747467.2A patent/CN104453936A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110685721A (en) * | 2019-11-20 | 2020-01-14 | 张军贤 | Jet-anchored net hanging construction method for roadway surrounding rock support |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150325 |
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| WD01 | Invention patent application deemed withdrawn after publication |