CN208816155U - The prestressing force grouting cable anchor of breaking surrounding rock roadway support - Google Patents
The prestressing force grouting cable anchor of breaking surrounding rock roadway support Download PDFInfo
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- CN208816155U CN208816155U CN201821481238.0U CN201821481238U CN208816155U CN 208816155 U CN208816155 U CN 208816155U CN 201821481238 U CN201821481238 U CN 201821481238U CN 208816155 U CN208816155 U CN 208816155U
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- steel pipe
- cable
- anchor
- steel
- bending
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Abstract
The utility model discloses a kind of prestressing force grouting cable anchors of breaking surrounding rock roadway support, it includes steel pipe and non-bending steel cable, and length of steel pipe is less than hole depth 5-10mm, and steel pipe walls are equipped with multiple slurry outlets；The non-bending steel cable length is greater than hole depth 200-300mm；In the non-bending steel cable insertion steel pipe, front and back ends stretch out steel pipe, peel crust exposing bare wire head off after stretching out steel pipe；Loading plate and tapered end are installed on the bare wire head of front end, are blocked in non-bending steel cable front end on steel pipe front end face by loading plate and tapered end.The utility model thoroughly solves the problems, such as that existing prestress anchorage cable is unable to slip casting, grouting cable anchor cannot apply prestressed contradiction, it realizes and applies prestressed this after the slip casting of anchor cable elder generation and perplex the problem of technical staff for many years, thoroughly solve the support issues in serious breaking surrounding rock tunnel.
Description
Technical field
The utility model relates to support of underground tunnel technology more particularly to the anchor cables of roadway support.
Background technique
It is very common using cable bolting in support of underground tunnel.According to cable bolting mode have prestress anchorage cable and
Hollow grouting cable anchor etc..
Prestressed anchor cable body is made of high strength cast iron, steel strand wires or spiral.Working principle is one end anchor of anchor cable
Gu referred to as anchored end is also known as anchoring section or anchor root, the other end are applied outside anchor hole in anchor cable mounting hole (hereinafter referred to as anchor hole) bottom
Pulling force is added to be locked again with lockset, referred to as outer anchor head or outer anchoring section join soft rock mass and firm ground by prestressing method
Together, to change the stress state of tunnel rock mass, the globality and intensity of roadway surrounding rock are improved.Construction prestressed cable
When, need special tension device and equipment.It is divided into mechanical and cementing formula two major classes by anchored end structure type, cementing formula is divided again
For mortar cementitious and two class of plastic bonding.Outer anchor head is position of the anchor cable so as to offer tension tonnage and locking, and type has anchor
Plug, screw-type, Reinforced Concrete Circular Cylinder body anchor pier formula, pier nose anchor formula and Steel Structure formula etc..Prestress anchorage cable applies in general to
The more stable tunnel of country rock globality.
The tunnel poor for country rock globality generally uses grouting cable anchor.Grouting cable anchor is that anchor cable body is mounted on anchor
Kong Zhong, then to anchor hole middle-high pressure grouting, slurries are entered in country rock gap by anchor hole, and breaking surrounding rock is cementing integral.Slip casting
Anchor cable mostly uses hollow grouting cable anchor, and it is hollow structure that it is internal, carries slip casting core pipe, You Duogen reinforcing bar is wrapped in slip casting core pipe
On, by slip casting core pipe to anchor hole middle-high pressure grouting.After the anchor of hollow grouting cable anchor top usable resins powder stick end, outside hole immediately
Apply pretightning force to be carried, then carries out slip casting again.This anchor cable structure is pressure anchor wire structure.General pressure anchor wire
Loading process be: stretch-draw prestressing force-steel strand wires-loading plate-slip casting solid-country rock, often due to slip casting solid intensity is inadequate,
It cannot apply more high-prestressed, destroy country rock around loading plate, so that anchor cable generates biggish displacement.
Therefore, for the serious broken country rock tunnel such as shear-zone, generally after driving should the cementing country rock of slip casting immediately, it is no
Then collapse the lane Bu Cheng；After wall rock grouting is cementing, if not applying pretightning force, the later period supporting effect in such tunnel will be by very big
It influences, greatly shortens the length of service.So current prestress anchorage cable and hollow grouting cable anchor all can't resolve rock crusher lane
The support issues in road.
In addition, tunnel of many early stages is with the extension of pit mining time in recent years, under dynamic pressure effect, rock crusher is tight
Weight, the support system forfeiture effect of early stage, there are major hidden dangers for safety in production.As the reparation branch in this kind of serious breaking surrounding rock tunnel
Shield problem annoyings always technical staff as shear-zone tunnel above-mentioned, to not having a kind of effective anchoring support also at present
Method.
Utility model content
In order to solve the support issues in serious breaking surrounding rock tunnel, the utility model proposes a kind of breaking surrounding rock roadway supports
Prestressing force grouting cable anchor.
In order to achieve the above objectives, the technical scheme adopted by the utility model is that:
A kind of prestressing force grouting cable anchor of breaking surrounding rock roadway support, which is characterized in that it includes steel pipe and soap-free emulsion polymeization
Steel strand wires；The diameter of steel tube matches with anchor hole, can smoothly be inserted into anchor hole, and length is less than hole depth 5-10mm, steel
Tube wall is equipped with several slurry outlets；The non-bending steel cable diameter is less than diameter of steel tube, and length is greater than hole depth 200-
300mm；In the non-bending steel cable insertion steel pipe, front and back ends stretch out steel pipe, peel crust exposing off after stretching out steel pipe
Bare wire head；Loading plate and tapered end are installed on the bare wire head of front end, it is desirable that carrying board diameter is consistent with outer diameter of steel pipes, passes through loading plate
Non-bending steel cable front end is blocked on steel pipe front end face with tapered end.
It is as follows using the prestressing force grouting cable anchor supporting breaking surrounding rock tunnel method of above structure:
The first step, interception are less than hole depth 5-10mm length a, diameter and anchor hole diameter matches Duan Gangguan, steel pipe
Upper several slurry outlets are processed on wall；Processing and the consistent loading plate of outer diameter of steel pipes, may pass through soap-free emulsion polymeization steel in processing on loading plate
The through-hole of twisted wire；
Second step, interception are greater than one section of non-bending steel cable of hole depth 200-300mm length, it is desirable that soap-free emulsion polymeization steel twists
The tensile strength of line is greater than the design strength of anchor cable pretightning force；Processing and the consistent loading plate of outer diameter of steel pipes, are processed on loading plate
On may pass through the through-hole of non-bending steel cable；
Third step peels the front end of non-bending steel cable off crust and exposes bare wire head 5-10mm, then penetrates in steel pipe, preceding
End bare wire head installs loading plate after exposing steel pipe, and is fastened with by tapered end bare wire head, spare；
4th step drills according to the requirement of breaking surrounding rock drift section design of its support into country rock, immediately will be upper after drilling
It states steel pipe and carries in non-bending steel cable insertion anchor hole, aperture is blocked with sealing material, by connecting tube by grouting equipment
Grouting Pipe link together with steel pipe, the slip casting into breaking surrounding rock according to traditional grouting method, grouting pressure reach design pressure
When power, slip casting terminates, and removes grouting equipment；
Above-mentioned sealing material can use quick-hardening cement or stop grouting plug, and choosing is one of.
5th step peels the non-bending steel cable outside exposed hole off crust and exposes bare wire head, install after grout cures
Pallet is carried, is conventionally that non-bending steel cable applies prestressing force using tension device, when reaching the prestressing force of design,
Lockset is installed, tension device is removed, construction finishes.
The working principle and good effect of the utility model:
1. since first slip casting rear slurry is only bonded with the crust of non-bending steel cable, and between strand core crust still
Slidably, do not influence applying prestressing force after slip casting, thoroughly solve existing prestress anchorage cable be unable to slip casting, grouting cable anchor cannot
The contradiction for applying prestressed problem realizes and applies prestressed this after the slip casting of anchor cable elder generation and perplex technical staff's for many years
Problem thoroughly solves the support issues in serious breaking surrounding rock tunnel.
2. anchor hole can be beaten immediately after excavation for serious breaking surrounding rock tunnel, it is high immediately using the method for the utility model
Pressure grouting, slurries, which enter in rock mass, to carry out cementing, prevents wall damage, improves the stability of country rock rapidly.It is solidifying in injecting paste material
It ties in hardening process, roadway surrounding rock automatically generates deformation, discharges stress, carries out tensioning when to be deformed a certain amount of again and applies preload
The supporting body of power, pretightning force is located at anchor cable bottommost, belongs to the support principle of " pressure-type " anchor cable, effectively controls the country rock later period
Deformation, achievees the purpose that permanently effective supporting.
3. the stress transmittance process of the utility model is: stretch-draw prestressing force-steel strand wires-loading plate-steel pipe and its slip casting are solid
Body-country rock, wherein steel pipe and its slip casting solid form the ideal structure of " steel core concrete column ", with general pressure anchor wire phase
Than the stability of slip casting solid greatly being improved, so that anchor force greatly improves.
Detailed description of the invention
Fig. 1 is status diagram of the utility model embodiment prestressing force grouting cable anchor in anchor hole；
Fig. 2 is that the amplified construction of the utility model embodiment prestressing force grouting cable anchor is intended to；
Fig. 3 is the schematic diagram of the utility model embodiment prestressing force grouting cable anchor support conditions.
In figure, 1- lockset, 2- carries pallet, 3- steel pipe, 4- slurry outlet, 5- non-bending steel cable, 6- loading plate, 7- lock
Head, 8- sealing material, 9- breaking surrounding rock, 10- anchor hole, 11- crust.
Specific embodiment
The technical solution of the utility model is further illustrated with reference to the accompanying drawing.
As shown in Fig. 2, the prestressing force grouting cable anchor of the utility model, including steel pipe 3 and non-bending steel cable 5；Described
Steel pipe 3 matches with anchor hole diameter, and length is less than hole depth 5-10mm, and 3 wall of steel pipe is equipped with several slurry outlets 4；Described
5 diameter of non-bending steel cable is less than 3 diameter of steel pipe, and length is greater than hole depth 10-15mm；The non-bending steel cable 5 is inserted
Enter in steel pipe 3, front and back ends stretched head peels crust 11 off and exposes bare wire head；Loading plate 6 and lock are installed on the bare wire head of front end
First 7, it is desirable that 6 diameter of loading plate is consistent with 3 outer diameter of steel pipe, stops 5 front end of non-bending steel cable by loading plate 6 and tapered end 7
On 3 front end face of steel pipe；Carrying pallet 2 and lockset 1 are installed on the rear end bare wire head of non-bending steel cable 5.
It is as shown in Figure 1, Figure 2 and Figure 3 using the prestressing force grouting cable anchor supporting breaking surrounding rock tunnel method of above structure, tool
Body is as follows:
The first step, interception are less than 10 depth 5-10mm length of anchor hole, 10 diameter matches of a diameter and anchor hole Duan Gangguan
3, upper several slurry outlets 4 are processed on 3 wall of steel pipe；Processing and the consistent loading plate 6 of 3 outer diameter of steel pipe, can wear in processing on loading plate 6
Cross the through-hole of non-bending steel cable 5；
Second step, diameter of the interception greater than 10 depth 10-20mm of anchor hole are less than one section of non-bending steel cable of 3 diameter of steel pipe
5, it is desirable that the tensile strength of non-bending steel cable 5 is greater than the design strength of anchor cable pretightning force；Processing with 3 outer diameter of steel pipe is consistent holds
Support plate 6 may pass through the through-hole of non-bending steel cable 5 on loading plate 6 in processing；
Third step peels the front end of non-bending steel cable 5 off crust 11 and exposes bare wire head, then penetrates in steel pipe 3, front end
Bare wire head installs loading plate 6 after exposing steel pipe 3, and bare wire head is fastened with tapered end 7, spare；
4th step, according to the requirement of breaking surrounding rock drift section design of its support, drilling anchor hole 10, anchor hole into breaking surrounding rock 9
Afterwards immediately by above-mentioned steel pipe 3 and carry non-bending steel cable 5 be inserted into anchor hole 10 in (as shown in Figure 3), aperture sealing material 8
It blocks, the Grouting Pipe of grouting equipment and steel pipe 3 is linked together by connecting tube, according to traditional grouting method to breaking surrounding rock
Slip casting in 9, when grouting pressure reaches design pressure, slip casting terminates, and removes grouting equipment；
Above-mentioned sealing material 8 quick-hardening cement or stop grouting plug.
5th step peels the non-bending steel cable 5 outside exposed hole off crust 11 and exposes bare wire head, peace after grout cures
Carrying pallet 2 is loaded onto, is conventionally that non-bending steel cable 5 applies prestressing force using tension device, reaches the pre- of design
When stress, lockset 1 is installed, removes tension device (as shown in Figure 3), construction finishes.
Claims (1)
1. a kind of prestressing force grouting cable anchor of breaking surrounding rock roadway support, which is characterized in that it includes steel pipe and soap-free emulsion polymeization steel
Twisted wire；The diameter matches with anchor hole, can smoothly be inserted into anchor hole, and length of steel pipe is less than hole depth 5-10mm, steel pipe
Wall is equipped with multiple slurry outlets；The non-bending steel cable length is greater than hole depth 200-300mm, and non-bending steel cable is inserted
Enter in steel pipe, front and back ends stretch out steel pipe, peel crust exposing bare wire head off after stretching out steel pipe；It is equipped on the bare wire head of front end
Loading plate and tapered end, it is desirable that carrying board diameter is consistent with outer diameter of steel pipes, makes non-bending steel cable front end by loading plate and tapered end
It is blocked on steel pipe front end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821481238.0U CN208816155U (en) | 2018-09-11 | 2018-09-11 | The prestressing force grouting cable anchor of breaking surrounding rock roadway support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821481238.0U CN208816155U (en) | 2018-09-11 | 2018-09-11 | The prestressing force grouting cable anchor of breaking surrounding rock roadway support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208816155U true CN208816155U (en) | 2019-05-03 |
Family
ID=66276602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821481238.0U Expired - Fee Related CN208816155U (en) | 2018-09-11 | 2018-09-11 | The prestressing force grouting cable anchor of breaking surrounding rock roadway support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208816155U (en) |
-
2018
- 2018-09-11 CN CN201821481238.0U patent/CN208816155U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190503 Termination date: 20200911 |