CN108661663B - Method for reinforcing insulating protective net in lining-free tunnel - Google Patents
Method for reinforcing insulating protective net in lining-free tunnel Download PDFInfo
- Publication number
- CN108661663B CN108661663B CN201710191319.0A CN201710191319A CN108661663B CN 108661663 B CN108661663 B CN 108661663B CN 201710191319 A CN201710191319 A CN 201710191319A CN 108661663 B CN108661663 B CN 108661663B
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- CN
- China
- Prior art keywords
- backing plate
- insulating protective
- anchor backing
- protective net
- anchor
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/006—Lining anchored in the rock
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
Abstract
The invention discloses a method for reinforcing an insulating protective net in a linerless tunnel. The method comprises the following steps: the method comprises the following steps of (1) spreading an insulating protective net on surrounding rocks of a lining-free tunnel, and fixing a plurality of anchor backing plates on the surrounding rocks through meshes of the insulating protective net, so that the insulating protective net is reinforced; the anchor backing plate is annular; the outer diameter of the anchor backing plate is not less than 3 times of the side length of the mesh. The method for fixing the insulating protective net by the anchor backing plate has the characteristics of rapidness, convenience and short construction period of tunnel protection. The anchor backing plate adopted by the invention has the characteristics of practicability and attractiveness, can effectively reduce the abrasion to the insulating protective screening, and prolongs the service life. The anchor backing plate adopted by the invention adopts a galvanized steel plate, and the edge is processed with a transition chamfer.
Description
Technical Field
The invention relates to a method for reinforcing an insulating protective net in a linerless tunnel.
Background
Many old tunnels are not lined and have already reached the development stage, the problems of block falling, cracks and the like occur, the driving safety is seriously influenced, particularly, the block falling prevention reinforcement of the electrified tunnel needs an insulating material and the construction time is short, the reinforcement requirements are difficult to meet by the existing reinforcement methods such as concrete, carbon fiber nets, metal nets and the like, the skylight opening time needed by the old tunnels is too long, and the old tunnels and the electrified tunnels have the problems of electric conduction and electrification. By using
The insulating protective net woven by the para-aramid fiber has the characteristics of high strength, corrosion resistance, good insulativity, flame retardance, convenience in construction and the like, and is suitable for tunnel reinforcement. But the original reinforcing method is easy to leadTo make
The fibers are abraded to lose strength, and thus a new reinforcing method needs to be provided.
Disclosure of Invention
The invention aims to provide a method for reinforcing an insulating protective net in a lining-free tunnel.
The invention provides a method for reinforcing an insulating protective net in a linerless tunnel, which comprises the following steps:
the method comprises the following steps of (1) spreading an insulating protective net on surrounding rocks of a lining-free tunnel, and fixing a plurality of anchor backing plates on the surrounding rocks through meshes of the insulating protective net, so that the insulating protective net is reinforced;
the mesh refers to a basic unit forming the insulating protective net, and can be a square, a rectangle, a rhombus or the like, and the side length of the mesh refers to the length of the longest single side of the mesh;
the anchor backing plate is in a ring shape.
In the method, the outer diameter of the anchor backing plate is not less than 3 times of the side length of the mesh, so that the mesh can be prevented from slipping.
In the method, the thickness of the anchor backing plate is not less than 10 mm.
In the method, the chamfers on the upper surface and the lower surface of the anchor backing plate and the side surfaces are the same, the radius of each chamfer is not less than 3mm and not more than half of the thickness of the anchor backing plate, and friction of transition regions of the upper surface and the lower surface on the protective net can be reduced.
In the method, the inner diameter of the anchor backing plate is 10-25 mm.
In the method, the anchor backing plate is fixed on the surrounding rock through the bolt with the exposed end of the anchor rod.
In the above method, the anchor pad is made of a galvanized steel sheet.
In the above method, the insulationThe protective net is woven by para-aramid fiber, the chemical name is poly-p-phenylene terephthamide, and the repeating unit of the chemical formula is [ -CO-C6H4-CONH-C6H4-NH-]-the amide group attached to the benzene ring is in the para-position.
In the method, the anchor backing plates are distributed in a plum blossom shape.
The method of the invention has the following characteristics:
1. the method for fixing the insulating protective net by the anchor backing plate has the characteristics of rapidness, convenience and short construction period of tunnel protection.
2. The anchor backing plate adopted by the invention has the characteristics of practicability and attractiveness, can effectively reduce the abrasion to the insulating protective screening, and prolongs the service life.
3. The anchor backing plate adopted by the invention adopts a galvanized steel plate, and the edge is processed with a transition chamfer.
Drawings
FIG. 1 is a schematic view of the structure of an anchor pad used in the method of the present invention.
Fig. 2 is a front view of an anchor pad used in the method of the present invention.
Fig. 3 is a schematic view of the present invention reinforcing an insulating protection net using an anchor backing plate.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1 use of an anchor backing plate
Insulating protective net is reinforced in tunnel
The materials used were as follows:
the anchor backing plate is made of galvanized steel plates, is in a circular ring shape, has the outer diameter of 180mm, the inner diameter of 25mm and the thickness of 10mm, has the same chamfer angle of the upper surface and the lower surface with the side surface, and has the radius of 3mm, as shown in figure 2.
Anchor rod: the method is characterized in that a hollow full-length grouting anchor rod is adopted, the corrosion prevention is realized by adopting a hot-dip galvanizing process, the diameter of the anchor rod is 25mm, the length of the anchor rod is 1-2.5 m (including an exposed section), and the specific design length is determined according to a surrounding rock stress ring test report.
Rope sewing: using a diameter of 9mm
The rope acts as a suture rope.
Auxiliary anchor rod: the anchor rod is used for enabling the protective net to be better attached to the surface of tunnel surrounding rock at a local valley or a boundary, the structure of the anchor rod is the same as that of a main anchor rod, the diameter of the anchor rod is slightly smaller than that of the anchor rod, the diameter of the anchor rod is generally 20mm, and the length of the anchor rod is 1-2 m.
Grouting material: the reinforced TGRM cement-based special grouting material is selected, the compressive strength of the reinforced TGRM cement-based special grouting material is more than 8MPa in 30min, the initial setting time is not earlier than 12min, the fluidity is more than 260mm, and the reinforced TGRM cement-based special grouting material has good grouting property so as to ensure the realization of construction process conditions.
The insulating protective net is used for reinforcing the interior of the unlined tunnel according to the following steps:
1. anchor rod arrangement
The anchor rods are arranged from the arch raising line according to a quincunx shape, the distance between the anchor rods is 1.5m, and the distance between the anchor rods is reduced or the anchor rods are lengthened in a special section.
2、
Laying of insulating protective net
2.1, lapping: according to the actual conditions and the design requirements of the vault, the end part is ensured to be straight when the net is laid.
2.2 suture connection: adjacent net sheetThe diameter of the edge meshes is 9mm
The sewing method comprises the following steps:
a continuous sewing rope splayed knot method.
1) Using a tool: a shuttle for winding the rope.
2) Rope specification: diameter of 9mm
A rope.
3) The winding method comprises the following steps: handle
The ropes are wound on the shuttle, the number of the ropes is proper, the ropes can smoothly pass through the net meshes, the net meshes of the two nets are parallel, the two net meshes are fixed by a method for fixing the net meshes and the net meshes, each net mesh is continuously moved, and finally, a dead knot is tied at the ending point.
3. Installing an anchor backing plate: as shown in fig. 2, the anchor backing plate is installed and the bolt provided with the exposed end of the anchor rod is tightened to apply prestress so that
The net is tensioned and clings to the surface of the surrounding rock, and the bolt provided with the exposed end of the anchor rod is designed to be anti-falling and can be detached to be used for cleaning accumulated stones.
Using a diameter of 2mm
The rope has 3mm chamfer radius's anchor backing plate and edge for the right angle anchor backing plate respectively at the edge and carries out fatigue friction test (adopt the cord fatigue testing machine, set for the rotational speed and be 60 revolutions per minute), and the tensile strength of two kinds of samples is tested after 100 friction tests, as shown in table 1, the anchor backing plate that the edge has the chamfer can effectively reduce the wearing and tearing to insulating protection network, improves life.
TABLE 1 tensile Strength of two samples after Friction test
| Chamfering type of anchor backing plate | Tensile strength/Newton |
| The edge is provided with a 3mm chamfer | 1630 |
| The edges being at right angles | 756 |
Claims (1)
1. A method of reinforcing an insulating protective net in a linerless tunnel, comprising the steps of:
the method comprises the following steps of spreading an insulating protective net on the surface of surrounding rocks of a lining-free tunnel, and fixing a plurality of anchor backing plates on the surrounding rocks through meshes of the insulating protective net, so that the insulating protective net is reinforced;
the anchor backing plate is annular;
the outer diameter of the anchor backing plate is not less than 3 times of the side length of the mesh;
the thickness of the anchor backing plate is not less than 10 mm;
the upper surface and the lower surface of the anchor backing plate are the same as the chamfers on the side surfaces, and the radius of the chamfers is not less than 3mm and not more than one half of the thickness of the anchor backing plate;
the inner diameter of the anchor backing plate is 7-25 mm;
fixing the anchor backing plate on the surrounding rock through a bolt with an exposed end of an anchor rod;
the anchor backing plate is made of galvanized steel sheets;
the insulating protective net is formed by weaving para-aramid fibers;
the anchor backing plate is arranged in a plum blossom shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710191319.0A CN108661663B (en) | 2017-03-28 | 2017-03-28 | Method for reinforcing insulating protective net in lining-free tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710191319.0A CN108661663B (en) | 2017-03-28 | 2017-03-28 | Method for reinforcing insulating protective net in lining-free tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108661663A CN108661663A (en) | 2018-10-16 |
| CN108661663B true CN108661663B (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710191319.0A Active CN108661663B (en) | 2017-03-28 | 2017-03-28 | Method for reinforcing insulating protective net in lining-free tunnel |
Country Status (1)
| Country | Link |
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| CN (1) | CN108661663B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007211471A (en) * | 2006-02-09 | 2007-08-23 | Shigeru Une | Renovating repair method in ground anchor construction |
| CN201232558Y (en) * | 2008-06-24 | 2009-05-06 | 义马煤业(集团)有限责任公司 | Fully-mechanized mining cutting hole full-section anchored net support |
| CN201381866Y (en) * | 2009-04-12 | 2010-01-13 | 颜涛 | Anchor rod pallet board |
| CN202023196U (en) * | 2011-02-25 | 2011-11-02 | 江西省交通科学研究院 | Slope stabilizing device combining basalt fiber composite mesh and inter-anchor reinforcing bar |
| CN104110015A (en) * | 2014-07-30 | 2014-10-22 | 中国水利水电第十四工程局有限公司 | Tunnel safety protection net and installation method thereof |
| CN104453959A (en) * | 2014-12-07 | 2015-03-25 | 金川集团股份有限公司 | Shot-anchoring net supporting method for surrounding rock of roadway |
| CN105134264A (en) * | 2015-06-29 | 2015-12-09 | 上海大屯能源股份有限公司 | Bolting and shotcrete net propping construction process |
| CN106013187A (en) * | 2016-06-23 | 2016-10-12 | 衡水力能新材料工程有限公司 | Active protection system |
| CN106401626A (en) * | 2016-06-02 | 2017-02-15 | 长春天地聚氨酯科技有限公司 | Anchor cable or anchor stock pallet with polyurethane coating layer and manufacturing method of anchor cable or anchor stock pallet |
-
2017
- 2017-03-28 CN CN201710191319.0A patent/CN108661663B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007211471A (en) * | 2006-02-09 | 2007-08-23 | Shigeru Une | Renovating repair method in ground anchor construction |
| CN201232558Y (en) * | 2008-06-24 | 2009-05-06 | 义马煤业(集团)有限责任公司 | Fully-mechanized mining cutting hole full-section anchored net support |
| CN201381866Y (en) * | 2009-04-12 | 2010-01-13 | 颜涛 | Anchor rod pallet board |
| CN202023196U (en) * | 2011-02-25 | 2011-11-02 | 江西省交通科学研究院 | Slope stabilizing device combining basalt fiber composite mesh and inter-anchor reinforcing bar |
| CN104110015A (en) * | 2014-07-30 | 2014-10-22 | 中国水利水电第十四工程局有限公司 | Tunnel safety protection net and installation method thereof |
| CN104453959A (en) * | 2014-12-07 | 2015-03-25 | 金川集团股份有限公司 | Shot-anchoring net supporting method for surrounding rock of roadway |
| CN105134264A (en) * | 2015-06-29 | 2015-12-09 | 上海大屯能源股份有限公司 | Bolting and shotcrete net propping construction process |
| CN106401626A (en) * | 2016-06-02 | 2017-02-15 | 长春天地聚氨酯科技有限公司 | Anchor cable or anchor stock pallet with polyurethane coating layer and manufacturing method of anchor cable or anchor stock pallet |
| CN106013187A (en) * | 2016-06-23 | 2016-10-12 | 衡水力能新材料工程有限公司 | Active protection system |
Non-Patent Citations (1)
| Title |
|---|
| 对位芳纶复合材料的研究进展;周美进等;《合成技术及应用》;20161231;第31卷(第4期);第22-27页 * |
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| CN108661663A (en) | 2018-10-16 |
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