CN211777524U - Lengthened anti-drop prestressed hollow grouting anchor rod - Google Patents
Lengthened anti-drop prestressed hollow grouting anchor rod Download PDFInfo
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- CN211777524U CN211777524U CN202020207323.9U CN202020207323U CN211777524U CN 211777524 U CN211777524 U CN 211777524U CN 202020207323 U CN202020207323 U CN 202020207323U CN 211777524 U CN211777524 U CN 211777524U
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Abstract
The utility model discloses an extension anticreep prestressing force cavity slip casting stock, including the anchor head and the stock body, the anchor head sets up two shell clamping pieces that rise on the shell inner wedge that rise including the shell inner wedge that rises with the symmetry the shell inner wedge head symmetry that rises is provided with wedge groove and T trough on the shell clamping piece that rises be provided with respectively with wedge groove and T trough complex wedge wing and T trough on the shell clamping piece the end of the stock body sets gradually only fills in stopper, backing plate, ball nut and prestressing force device. The utility model can effectively prevent the expansion shell clamping piece from being pulled away from the anchor rod and falling off from the head of the wedge in the expansion shell when the pretightening force is applied; the utility model can overcome the problem that the overlength anchor rod is not easy to be placed in the middle by additionally arranging one or more fixers for fixing the anchor rod body and the anchor hole position in the middle of the anchor rod body; the utility model discloses a prestressing force is applyed to mechanical device, has effectively overcome among the prior art simply lean on the defect that the prestressing force exists is applyed to the manpower.
Description
Technical Field
The utility model relates to an extension anticreep prestressing force cavity slip casting stock.
Background
With the high-speed development of the traffic construction industry in China, more and more newly-built tunnels need to pass through complex geology, and the requirements of tunnel support on the prestressed anchor rods are increased. However, in the actual use process of the anchor rod, the following three problems exist:
(1) the shell expansion clamping piece of the anchoring head on the market does not have a limiting device in the expansion direction of the anchoring head, so that the shell expansion clamping piece can easily slide out of the T-shaped groove in a severe working environment. For example, the anchor rods stored in the anchor rod storage of the anchor rod trolley can slide out along the T-shaped groove due to large vibration of the trolley during working; or in IV-V grade soft rock, due to poor surrounding rock performance, when prestress is applied, the expansion shell clamping piece is squeezed into the soft rock, so that the expansion shell clamping piece is separated from the expansion shell inner wedge, at the moment, the anchoring head fails, the rejection rate of the anchor rod is increased, and the expansion shell clamping piece lost in the anchor hole cannot be recycled.
(2) Because the lengthened anchor rods are connected by two or three anchor rods through connecting sleeves, the total length can reach 9-15 meters. In the use process, only the anchoring head and the grout stopper are used for fixing the anchor rod in the radial direction of the anchor hole. The grout stop plug is made of rubber, is relatively soft and has poor centering effect on the anchor rod; meanwhile, the outer diameter of the anchor rod body is smaller than the diameter of the anchor hole, the length of the anchor rod body is long, the deflection is large, and the connection between the middle section of the anchor rod body and the anchor hole is not stable enough, so that a grouting layer wrapping the anchor rod body after grouting is extremely uneven, the grouting quality is poor, the anchoring effect is poor, and the anticorrosion effect of the grouting layer at a thinner part on the anchor rod body is also poor.
(3) Because the prestressed anchor rod needs to be prestressed when being installed, and the prestressing force is applied by pure manpower, the prestressed anchor rod has the defects of low efficiency, poor effect, time and labor waste and the like.
These problems all directly influence the quality and efficiency of tunnel anchor bolt support, further influence engineering quality and construction progress.
Disclosure of Invention
In order to overcome the above-mentioned shortcoming of prior art, the utility model provides an extension anticreep prestressing force cavity slip casting stock. The utility model can effectively prevent the expansion shell clamping piece from being pulled away from the anchor rod and falling off from the head when pretightening force is applied by matching the wedge-shaped two-wing structure designed on the expansion shell clamping piece with the wedge-shaped groove on the inner wedge; the utility model can overcome the problem that the overlength anchor rod is not easy to be placed in the middle by additionally arranging one or more fixers for fixing the anchor rod body and the anchor hole position in the middle of the anchor rod body; the utility model discloses a prestressing force device is applyed to machinery (stock connector sleeve and stock connector), has effectively overcome among the prior art simply by the defect that the manpower applys the prestressing force and exists.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides an extension anticreep prestressing force cavity slip casting stock, includes the anchor head and the stock body, the anchor head is including rising two shell clamping pieces that rise that shell inner wedge and symmetry set up on the shell inner wedge that rise shell inner wedge head symmetry that rises is provided with wedge groove and T capable groove rise be provided with respectively on the shell clamping piece with wedge groove and T capable groove complex wedge wing and T capable wing rise the excircle end of shell clamping piece is provided with the barb structure, rise the shell inner wedge and be connected with the stock body through the screw thread that the afterbody set up the end of the stock body sets gradually only thick liquid stopper, backing plate, ball nut and prestressing force device.
Furthermore, a cushion block is arranged at the bottom of the expansion shell clamping piece, and the cushion block and the expansion shell inner wedge are welded together.
Furthermore, the anchor rod body is a lengthened rod body formed by connecting at least two sections of hollow rod bodies through connecting sleeves.
Furthermore, a fixer is arranged between the connecting sleeve and the grout stop plug.
Furthermore, a holder is arranged between the two connecting sleeves.
Further, the fixer adopts a convex round structure.
Further, the prestressing device comprises a shank connector and a shank connector sleeve.
Compared with the prior art, the utility model has the positive effects that:
(1) after the anchoring head is assembled and welded, the shell expansion clamping piece cannot fall off, and the shell expansion clamping piece cannot fall off from the shell expansion inner wedge and lose the anchoring effect when prestress is applied due to poor surrounding rock conditions;
(2) the installation power of the anchor rod is improved, the construction quality and efficiency are further improved, and the construction cost is reduced;
(3) the anti-drop structure improves the matching use effect of the common prestressed anchor rod and the anchor rod trolley, and further improves the mechanization degree of tunnel construction;
(4) the grouting quality is improved, the anticorrosion effect is enhanced, and the loss of anchoring force is reduced;
(5) the mechanical prestress application is convenient, rapid, time-saving and labor-saving, and the mechanization degree of tunnel construction is improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of the overall structure of the lengthened anti-drop prestressed hollow grouting anchor rod of the utility model;
FIG. 2 is a schematic structural view of an anchoring head;
FIG. 3 is a schematic structural view of an inner wedge of the expanding shell;
FIG. 4 is a schematic structural view of the expanding-shell clip;
FIG. 5 is a schematic view of a spacer;
FIG. 6 is a schematic view of the structure of the holder;
FIG. 7 is a schematic view of the construction of the sleeve of the anchor connector;
FIG. 8 is a schematic structural view of the anchor rod connector;
FIG. 9 is a schematic view of the connection of the ball nut 9 and the shank connector 11;
FIG. 10 is a schematic view of the connection of the ball nut 9, the anchor connector sleeve 10 and the anchor connector 11;
FIG. 11 is a schematic diagram of preliminary prestressing;
FIG. 12 is a schematic view of when secondary prestressing is initiated;
fig. 13 is a schematic view when the secondary prestressing is completed.
Detailed Description
An elongated anti-run prestressed hollow grouting anchor rod, as shown in fig. 1, comprising: shell splint 1 rises, cushion 2, the shell wedge 3 that rises, adapter sleeve 4, fixer 5, the stock body 6, only thick liquid stopper 7, backing plate 8, ball nut 9, stock connector sleeve 10, stock connector 11 etc. wherein:
firstly, an anti-drop principle:
as shown in fig. 2, an anchoring head is composed of a shell expansion clamping piece 1, a cushion block 2 and a shell expansion inner wedge 3; wherein: the tail part of the inner wedge 3 of the expanding shell is provided with threads for connecting with the anchor rod body 6, and the head part is provided with a symmetrical wedge-shaped groove 31 and a T-shaped groove 32 (shown in figure 3); the outer round end of the shell expansion clamping piece 1 is provided with a barb structure 43, and the inner part of the shell expansion clamping piece is provided with a wedge-shaped wing 41 and a T-shaped wing 42 (shown in figure 4). The T-shaped groove 32 of the inner wedge 3 of the expansion shell is convenient for laterally placing the expansion shell clamping piece 1; the wedge-shaped groove 31 is matched with the wedge-shaped wing 41, so that the shell-expanding clamping piece can be prevented from slipping from the upper part of the wedge in the shell, and the cushion block 2 (the structure is shown in figure 5) is placed at the lower end of the shell-expanding clamping piece 1, so that the clamping piece can be prevented from falling from the lower part.
The assembly method of the anchoring head is as follows:
1) firstly, the shell expansion clamping piece 1 is arranged in the shell expansion inner wedge 3 from a T-shaped groove 32 at the side of the shell expansion inner wedge 3;
2) the shell-expanding clamping piece 1 slides upwards along the T-shaped groove 32;
3) then the cushion block 2 is placed at the bottom of the shell-expanding clamping piece 1 to jack up the shell-expanding clamping piece;
4) after the assembly, the cushion block 2 and the inner wedge 3 of the expansion shell are welded together.
II, centering principle of an anchor rod:
the anchor rod body 6 is a hollow rod body and is a lengthened rod body formed by connecting two sections or three sections by connecting sleeves 4.
The fixer 5 is added between the connecting sleeve 4 and the grout stop plug 7, and if the anchor rod body is formed by connecting three sections of anchor rod bodies, the fixer 5 is added between the connecting sleeve and the connecting sleeve.
Because the anchor rod body is long, the deflection is big, and the interlude anchor rod body will be too close or direct contact with anchor eye wall distance, leads to the slip casting layer of the parcel anchor rod body after the slip casting inhomogeneous, influences the grouting effect and to the anticorrosive effect of anchor rod body. After the anchor is added, the maximum outer diameter of the anchor is close to the size of the anchor hole, and the convex round structure 51 (shown in figure 6) is adopted, so that the anchor hole has certain compressibility and can be well attached to the anchor hole, the anchor rod body is centered, the size of a gap between the anchor rod body and the wall of the anchor hole is kept consistent, a grouting layer is more uniform after grouting, and the grouting quality is improved.
Thirdly, the principle of mechanically applying prestress on anchor rod
The configuration of the bolt connector sleeve 10 is shown in figure 7 and the configuration of the bolt connector 11 is shown in figure 8.
The prestressing is applied in two steps:
in a first step, the anchor connector 11 is assembled on the ball nut 9, and the drilling machine can screw the anchor connector 11 for preliminary pre-tightening, as shown in fig. 9:
and secondly, taking down the anchor rod connector 11, connecting the spherical nut 9 with the anchor rod connector sleeve 10 firstly, then connecting the anchor rod connector sleeve 10 with the anchor rod connector 11, screwing the anchor rod connector 11 by the drilling machine to apply prestress for the second time, and compared with the manual prestress application, the whole process is convenient, rapid, time-saving and labor-saving, and is shown in fig. 10.
Supporting process
The assembled anchoring heads are connected with one of the anchor rod bodies, the fixer 5 is screwed into the middle part of the other anchor rod body, then the anchor rod body with the anchoring heads is sent into the anchor hole, when the anchor rod bodies are about to completely enter the anchor hole, the connecting sleeve 4 is connected with the other anchor rod body, and then the grout stop plug 7, the backing plate 8, the spherical nut 9 and the anchor rod connector 11 are sequentially arranged in the anchor hole, as shown in figure 11.
Firstly, when a anchor rod extends to the top end of an anchor hole, a drilling machine is used for screwing an anchor rod connector 11, and due to the fact that friction force exists between an anchoring head and the inner wall of the anchor hole, an anchor rod body can be screwed in and eject a shell expansion clamping piece, the shell expansion clamping piece is expanded preliminarily, and preliminary prestress application is completed;
secondly, the anchor rod connector 11 is taken down and then sequentially installed into the anchor rod connector sleeve 10 and the anchor rod connector 11, the anchor rod connector 11 is screwed to force the anchor rod body to drive the inner wedge of the expanding shell to move outwards, and the expanding shell clamping piece is further expanded due to the fact that the barb structure of the expanding shell clamping piece can be clamped in the wall of the anchor hole, as shown in fig. 12;
thirdly, the anchor rod connector is continuously screwed, after the anchor rod connector moves for a certain distance, the expansion shell clamping piece is completely expanded, and the expansion shell clamping piece cannot move outwards continuously because the size of the wedge-shaped groove of the inner wedge of the expansion shell is smaller than that of the wedge-shaped wing of the expansion shell clamping piece, so that the expansion shell clamping piece is prevented from falling off from the inner wedge of the expansion shell, and the secondary prestress application is completed, as shown in fig. 13.
After the prestress is applied, the anchor rod connector and the anchor rod connector sleeve are taken down, grouting is carried out again, and the anchor rod body can be centered and stabilized by the fixer during grouting, so that the anchor rod body is not shaken, and the grouting thickness is uniform. And finishing the whole installation process after grouting is finished.
Claims (7)
1. The utility model provides a extension anticreep prestressing force cavity slip casting stock which characterized in that: including anchor head and the stock body, the anchor head is including rising two shell clamping pieces that rise that shell inner wedge and symmetry set up on the shell inner wedge rise shell inner wedge shell head symmetry of rising is provided with wedge groove and T capable groove rise be provided with respectively on the shell clamping piece with wedge groove and T capable groove complex wedge wing and T capable wing rise the excircle end of shell clamping piece is provided with the barb structure, rise the shell inner wedge and be connected with the stock body through the screw thread that the afterbody set up the end of the stock body sets gradually only to starch stopper, backing plate, ball nut and prestressing force device.
2. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 1, characterized in that: and a cushion block is arranged at the bottom of the expansion shell clamping piece, and the cushion block and the expansion shell inner wedge are welded together.
3. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 1, characterized in that: the anchor rod body is a lengthened rod body formed by connecting at least two sections of hollow rod bodies through connecting sleeves.
4. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 3, characterized in that: and a fixer is arranged between the connecting sleeve and the grout stopping plug.
5. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 3, characterized in that: a fixer is arranged between the two connecting sleeves.
6. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 4 or 5, characterized in that: the fixer adopts a convex structure.
7. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 1, characterized in that: the pre-stressing means comprises a shank connector and a shank connector sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020207323.9U CN211777524U (en) | 2020-02-25 | 2020-02-25 | Lengthened anti-drop prestressed hollow grouting anchor rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020207323.9U CN211777524U (en) | 2020-02-25 | 2020-02-25 | Lengthened anti-drop prestressed hollow grouting anchor rod |
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| CN211777524U true CN211777524U (en) | 2020-10-27 |
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| CN202020207323.9U Active CN211777524U (en) | 2020-02-25 | 2020-02-25 | Lengthened anti-drop prestressed hollow grouting anchor rod |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294035A (en) * | 2021-12-02 | 2022-04-08 | 中铁隆昌铁路器材有限公司 | Tabletting torque nut type pre-stressed anchor rod and installation method thereof |
-
2020
- 2020-02-25 CN CN202020207323.9U patent/CN211777524U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294035A (en) * | 2021-12-02 | 2022-04-08 | 中铁隆昌铁路器材有限公司 | Tabletting torque nut type pre-stressed anchor rod and installation method thereof |
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