CN110685721A - Jet-anchored net hanging construction method for roadway surrounding rock support - Google Patents
Jet-anchored net hanging construction method for roadway surrounding rock support Download PDFInfo
- Publication number
- CN110685721A CN110685721A CN201911143949.6A CN201911143949A CN110685721A CN 110685721 A CN110685721 A CN 110685721A CN 201911143949 A CN201911143949 A CN 201911143949A CN 110685721 A CN110685721 A CN 110685721A
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- Prior art keywords
- steel
- plastic grating
- roadway
- hanging
- net
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- 239000011435 rock Substances 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000011378 shotcrete Substances 0.000 claims abstract description 12
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000009412 basement excavation Methods 0.000 claims abstract description 4
- 238000004873 anchoring Methods 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 230000008093 supporting effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/025—Grouting with organic components, e.g. resin
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
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 relates to a roadway construction method, in particular to a shotcrete net hanging net construction method for roadway surrounding rock support. The method solves the problem of net hanging of the steel-plastic grating in the roadway engineering, and comprises the following steps: determining the smoothness of surrounding rocks, cleaning loose broken stones on the surface of the surrounding rocks, determining the width of the steel-plastic grating, drilling, symmetrically laying the steel-plastic grating according to the arch crown → the arch waist → the side wall → the bottom foot in sequence, installing an anchor rod, checking the installation quality, and supplementing and hanging. By the aid of the net hanging method, a roadway construction working face is saved, roadway net hanging efficiency is improved, labor intensity of constructors is reduced, stability of roadway surrounding rocks is guaranteed, and safety and high efficiency of roadway excavation are guaranteed.
Description
Technical Field
The invention relates to a shotcrete net hanging net supporting method, in particular to a shotcrete net hanging net construction method for roadway surrounding rock supporting.
Background
When the stability problem of surrounding rocks in the construction of roadways and the like is solved, the shotcrete net support becomes the most common technology due to the obvious technical advantages. The technical advancement and the effect reliability of the shotcrete-anchor net support are proved by a large amount of engineering practices and are widely applied in the aspects of improving the stress state of the surrounding rock of the roadway, enhancing the bearing capacity of the surrounding rock of the roadway, improving the integrity of the surrounding rock of the roadway, increasing the stability of the surrounding rock of the roadway and the like.
In the traditional process of spray-anchor net support, the commonly used anchor net material is a metal net, and the net hanging construction method is mature, but with the appearance of new materials, the steel-plastic grating is gradually applied to roadway surrounding rock support, and the steel-plastic grating net is unreasonable according to the net hanging method of the metal net in the engineering construction process due to the characteristics of large area and light weight of a single net, so that how to adopt a reasonable net hanging construction method according to the characteristics of the steel-plastic grating and the actual situation of a construction site becomes one of key technologies to be solved by technical personnel.
Disclosure of Invention
The invention provides a construction method of a shotcrete net hanging net for a surrounding rock support of a roadway, aiming at solving the problem of construction of the shotcrete net hanging net for the surrounding rock support of the roadway in the process of constructing the roadway support.
The invention has the technical scheme that the construction method of the shotcrete net hanging net for the roadway surrounding rock support comprises the following steps:
A. before the steel-plastic grating net hanging construction, the flatness of the surrounding rock surface is determined, and loose broken stones on the surface of the surrounding rock are cleaned;
B. determining the width of the steel-plastic grating according to the side length of the excavation section of the roadway, and marking the position of the center line of the steel-plastic grating;
C. calculating the number of sections of the required steel-plastic grating according to the formula (a),
N= L/L0（a）
in the formula: n is the number of sections of the steel-plastic grating; l is the depth length of the roadway support; l is0The length of the single steel-plastic grating;
D. drilling holes by using an anchor rod drilling machine, wherein the arrangement distance of anchor holes is 80cm multiplied by 80cm, the position is accurate, the difference between the deviation and the design requirement is less than 50mm, the anchor holes are ensured to be vertical to the contour line of the roadway, the direction error of the anchor holes is less than 5 degrees, the depth of the anchor holes is consistent with the length of anchor rods, and after the drilling is finished, sundries such as residues, accumulated water and the like in the holes are cleaned;
E. conveying the steel-plastic grating to the section of the roadway to be supported, and in one section, symmetrically paving the steel-plastic grating according to the arch crown → arch waist → arch foot in sequence, wherein the length of the overlapping part of the grating is 15-20 cm;
F. installing an anchor rod, firstly cleaning rock residues and accumulated water in the anchor hole by using an air blower, when cleaning, standing an operator at one side of an orifice, strictly prohibiting a constructor from standing at the same position with the direction of the orifice, fixing a resin anchoring agent at the bottom of the anchor hole by using a drill rod, ensuring that the anchor rod is pushed to the resin anchoring agent, sleeving a steel wire mesh, an anchor disc, a screw cap and a special sleeve on the other end of the anchor rod, then driving the anchor rod by using a drilling machine, driving the anchor rod to rotate by using the drilling machine, uniformly stirring the anchoring agent for about 20 seconds, closing the drilling machine, applying pressure to the anchor rod by using the drilling machine, screwing the screw cap after 2min, controlling the torque at 150 N.m, and finally unloading the drilling machine;
G. the steel-plastic grating laying mode of each section is carried out according to the step E and the step F;
H. after the steel-plastic grating is hung, checking the quality of the hanging net, and if the steel-plastic grating is damaged in the hanging net process, performing local hanging supplement;
further, the width of the steel-plastic grating mesh belt in the steps A-H is 10mm-20mm, and the size of the steel-plastic grating mesh is 10cm multiplied by 10 cm-15 cm multiplied by 15 cm.
Furthermore, in the step H, the repair hanging length is 30-50cm longer from the damaged part to two sides, and the repair hanging width is 30-50cm longer from the damaged part to two sides.
Compared with the existing net hanging technology, the invention has the advantages of strong operability, simple net hanging process, high net hanging speed, high net hanging quality and low labor intensity of technical personnel. Because the steel-plastic grating is cut on the ground, the working surface of the steel-plastic grating is large, the construction is convenient, and meanwhile, the working surface of an underground roadway is indirectly enlarged; compared with the traditional metal net, the steel-plastic grating has light weight, so that the single-sheet net hanging area is large, and the net hanging efficiency is high. The steel-plastic grating has certain flexibility, can be coordinately deformed with surrounding rocks of a roadway, and has good supporting effect.
The invention will be further explained with reference to the drawings.
Drawings
FIG. 1 is a schematic diagram of the sequence of hanging nets on the section of a roadway
FIG. 2 is a schematic view of the center line of a steel-plastic grille
FIG. 3 is a schematic view of a steel-plastic grille partially hung
In the figure: 1. vault, arch waist, side wall, bottom foot, 5 steel-plastic grating, 6 center line, width of steel-plastic grating and length of single steel-plastic grating; the damaged part of the steel-plastic grating; repairing and hanging the length of the damaged steel-plastic grating; and repairing and hanging the width of the damaged steel-plastic grating.
Detailed Description
The invention relates to a construction method of a shotcrete net hanging net for roadway surrounding rock support, which comprises the following steps:
A. before the construction of the steel-plastic grating hanging net 5, the flatness of the surrounding rock surface is determined, and loose broken stones on the surface of the surrounding rock are cleaned;
B. determining the width of the steel-plastic grating 5 according to the side length of the excavation section of the roadway, and marking the central line position 6 of the steel-plastic grating 5, as shown in fig. 2;
C. the number of required sections of the steel-plastic grating 5 is calculated according to the formula (a),
N= L/L0（a）
in the formula:Nthe number of the sections of the steel-plastic grating 5; l is the depth length of the roadway support; l is0The length of the single steel-plastic grating 5;
D. drilling holes by using an anchor rod drilling machine, wherein the arrangement distance of anchor holes is 80cm multiplied by 80cm, the position is accurate, the difference between the deviation and the design requirement is less than 50mm, the anchor holes are ensured to be vertical to the contour line of the roadway, the direction error of the anchor holes is less than 5 degrees, the depth of the anchor holes is consistent with the length of anchor rods, and after the drilling is finished, sundries such as residues, accumulated water and the like in the holes are cleaned;
E. conveying the steel-plastic grating 5 to the section of the roadway to be supported, wherein in one section, the steel-plastic grating 5 is symmetrically laid in sequence according to the arch crown 1 → arch waist 2 → side wall 3 → footing 4, and the length of the lap joint of the steel-plastic grating 5 is 15-20 cm, as shown in figure 1;
F. installing an anchor rod, firstly cleaning rock residues and accumulated water in the anchor hole by using an air blower, when cleaning, standing an operator at one side of an orifice, strictly prohibiting a constructor from standing at the same position with the direction of the orifice, fixing a resin anchoring agent at the bottom of the anchor hole by using a drill rod, ensuring that the anchor rod is pushed to the resin anchoring agent, sleeving a steel wire mesh, an anchor disc, a screw cap and a special sleeve on the other end of the anchor rod, then driving the anchor rod by using a drilling machine, driving the anchor rod to rotate by using the drilling machine, uniformly stirring the anchoring agent for about 20 seconds, closing the drilling machine, applying pressure to the anchor rod by using the drilling machine, screwing the screw cap after 2min, controlling the torque at 150 N.m, and finally unloading the drilling machine;
G. the steel-plastic grating 5 of each section is laid according to the step E and the step F;
H. after the steel-plastic grating 5 is hung, the quality of the hung net is checked, if the steel-plastic grating is damaged in the net hanging process, partial hanging is carried out, and the hanging size of the steel-plastic grating 5 is shown in figure 3.
The construction method of the shotcrete net hanging net for supporting the surrounding rock of the roadway is described in detail, the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (3)
1. The invention relates to a construction method of a shotcrete net hanging net for roadway surrounding rock support, which comprises the following steps:
A. before the steel-plastic grating (5) is subjected to net hanging construction, the smoothness of the surrounding rock surface is determined, and loose broken stones on the surface of the surrounding rock are cleaned;
B. determining the width of the steel-plastic grating (1) according to the side length of the excavation section of the roadway, and marking the central line position (6) of the steel-plastic grating (5), as shown in figure 2;
C. calculating the number of sections of the required steel-plastic grating (5) according to the formula (a),
N= L/L0（a）
in the formula: n is the number of sections of the steel-plastic grating; l is the depth length of the roadway support; l0 is the length of the single sheet steel-plastic grid;
D. drilling holes by using an anchor rod drilling machine, wherein the arrangement distance of anchor holes is 80cm multiplied by 80cm, the position is accurate, the difference between the deviation and the design requirement is less than 50mm, the anchor holes are ensured to be vertical to the contour line of the roadway, the direction error of the anchor holes is less than 5 degrees, the depth of the anchor holes is consistent with the length of anchor rods, and after the drilling is finished, sundries such as residues, accumulated water and the like in the holes are cleaned;
E. the method comprises the following steps of conveying the steel-plastic grating (5) to a roadway section needing to be supported, wherein in one section, the steel-plastic grating (5) is symmetrically laid in sequence according to arch crown (1) → arch waist (2) → side wall (3) → footing (4), and the length of the overlapping part of the steel-plastic grating (5) is 15-20 cm, as shown in fig. 1;
F. installing an anchor rod, firstly cleaning rock residues and accumulated water in the anchor hole by using an air blower, when cleaning, standing an operator at one side of an orifice, strictly prohibiting a constructor from standing at the same position with the direction of the orifice, fixing a resin anchoring agent at the bottom of the anchor hole by using a drill rod, ensuring that the anchor rod is pushed to the resin anchoring agent, sleeving a steel wire mesh, an anchor disc, a screw cap and a special sleeve on the other end of the anchor rod, then driving the anchor rod by using a drilling machine, driving the anchor rod to rotate by using the drilling machine, uniformly stirring the anchoring agent for about 20 seconds, closing the drilling machine, applying pressure to the anchor rod by using the drilling machine, screwing the screw cap after 2min, controlling the torque at 150 N.m, and finally unloading the drilling machine;
G. the steel-plastic grating (5) of each section is laid according to the step E and the step F;
H. after the steel-plastic grating (5) is hung, the quality of the hanging net is checked, if the steel-plastic grating is damaged in the net hanging process, partial hanging supplement is carried out, and the hanging supplement size of the steel-plastic grating (5) is shown in figure 3.
2. The shotcrete net hanging construction method for roadway surrounding rock support according to claim 1, wherein the width of the steel-plastic grating (5) in the steps A-H is 10mm-20mm, and the mesh size of the steel-plastic grating (5) is 10cm x 10 cm-15 cm x 15 cm.
3. The shotcrete net hanging net construction method for roadway surrounding rock support according to claim 1, wherein in the step H, local hanging repair is carried out, the steel-plastic grating (5) hanging repair length is 30-50cm longer from a damaged position to two sides, and the steel-plastic grating (5) hanging repair width is 30-50cm longer from the damaged position to two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911143949.6A CN110685721A (en) | 2019-11-20 | 2019-11-20 | Jet-anchored net hanging construction method for roadway surrounding rock support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911143949.6A CN110685721A (en) | 2019-11-20 | 2019-11-20 | Jet-anchored net hanging construction method for roadway surrounding rock support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110685721A true CN110685721A (en) | 2020-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911143949.6A Withdrawn CN110685721A (en) | 2019-11-20 | 2019-11-20 | Jet-anchored net hanging construction method for roadway surrounding rock support |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215562A (en) * | 2021-12-10 | 2022-03-22 | 黄健松 | Supporting device for spraying slurry on geogrid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102635378A (en) * | 2012-04-20 | 2012-08-15 | 中钢集团马鞍山矿山研究院有限公司 | New process for high-strength resin anchor construction |
| CN102996148A (en) * | 2012-11-22 | 2013-03-27 | 中交第二公路勘察设计研究院有限公司 | High-ground stress soft rock highway tunnel supporting method |
| CN104453936A (en) * | 2014-12-09 | 2015-03-25 | 山东科技大学 | Roadway surrounding rock geogrid construction method |
| CN204324796U (en) * | 2014-10-28 | 2015-05-13 | 山东科技大学 | A kind ofly mould grid linked network supporting construction for the steel in bolting with wire mesh engineering |
-
2019
- 2019-11-20 CN CN201911143949.6A patent/CN110685721A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102635378A (en) * | 2012-04-20 | 2012-08-15 | 中钢集团马鞍山矿山研究院有限公司 | New process for high-strength resin anchor construction |
| CN102996148A (en) * | 2012-11-22 | 2013-03-27 | 中交第二公路勘察设计研究院有限公司 | High-ground stress soft rock highway tunnel supporting method |
| CN204324796U (en) * | 2014-10-28 | 2015-05-13 | 山东科技大学 | A kind ofly mould grid linked network supporting construction for the steel in bolting with wire mesh engineering |
| CN104453936A (en) * | 2014-12-09 | 2015-03-25 | 山东科技大学 | Roadway surrounding rock geogrid construction method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215562A (en) * | 2021-12-10 | 2022-03-22 | 黄健松 | Supporting device for spraying slurry on geogrid |
| CN114215562B (en) * | 2021-12-10 | 2024-01-30 | 珠海建航建筑劳务有限公司 | Support device for spraying soil engineering grid |
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Application publication date: 20200114 |
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