CN214169054U - Self-locking device for reinforced prestressed anchor cable of weak rock mass - Google Patents
Self-locking device for reinforced prestressed anchor cable of weak rock mass Download PDFInfo
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- CN214169054U CN214169054U CN202120039741.6U CN202120039741U CN214169054U CN 214169054 U CN214169054 U CN 214169054U CN 202120039741 U CN202120039741 U CN 202120039741U CN 214169054 U CN214169054 U CN 214169054U
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Abstract
The utility model discloses a self-locking device of a reinforced prestressed anchor cable for soft rock mass, which comprises an anchorage device and a clamping piece; the anchor is in a block shape and is provided with an anchor hole for penetrating through the prestressed anchor cable, and the clamping piece is in a wedge shape and is arranged in the anchor hole and positioned between the prestressed anchor cable and the inner wall of the anchor hole; the clamping piece is fixedly connected with the ground tackle, a gap for containing the spring is reserved between the limiting plate and the ground tackle, and two ends of the spring are respectively fixed on the clamping piece and the limiting plate. The technical effect of the utility model lies in, the utility model discloses the clamping piece can be along with the anchor rope is pulled out partly when forward stretch-draw, and the restoring force of spring can make the clamping piece more tightly be absorbed in the anchor eye during reverse stretch-draw, and welded steel pipe has increased the area of contact from locker and peripheral slip casting body behind special ground tackle, improves the transmission efficiency of the bonding stress of auto-lock steel pipe and peripheral slip casting body, finally transmits to the internal portion of ground to the anchor effect of prestressed anchorage cable is accomplished to self intensity that can the make full use of ground body.
Description
Technical Field
The utility model relates to a weak rock mass reinforcement type prestressed anchorage cable self-locking ware.
Background
The self-locking type pre-stressed anchor cable is a pre-stressed anchor cable structure capable of being automatically locked, which is firstly proposed by China railway science research institute, and self-locking devices with the same number as the inner anchoring section units are arranged at the free section of the pressure dispersion type anchor cable, so that a self-locking anchoring section, namely an outer anchoring section, is formed after tensioning is completed. The self-locking prestressed anchor cable can be divided into four parts of an outer anchor head, a self-locking anchoring section, a free section and an inner anchoring section along the length direction of the anchor cable from a tensioning end, the total length of the prestressed anchor cable is an unbonded steel strand, the rest parts except the free section are subjected to grouting, and an expansion section can be formed according to engineering requirements to increase the anchoring capacity. For a self-locking device structure system, if tensioning in a locking direction is reverse tensioning, and conversely, if tensioning in a forward direction (namely the tensioning direction of a common prestressed anchor cable) is positive tensioning, in order to meet the self-locking effect of the self-locking device, friction loss between a clamping piece and a steel strand needs to be small during positive tensioning, namely the clamping piece does not move with the steel strand as much as possible during positive tensioning, good contact between the steel strand and the clamping piece is ensured during reverse tensioning, sliding can not occur between the steel strand and the clamping piece basically, the clamping piece can be clamped in an anchor hole, and the existing self-locking prestressed anchor cable has the problems of low self-locking efficiency and difficulty in realizing the self-locking function. This is because current self-locking type prestressed anchorage cable is through screwing up the bolt at the beginning, utilizes the anti-steel sheet of pushing up to push up the clamping piece in the anchor eye in order to realize the in close contact with of clamping piece and steel strand wires, reaches the auto-lock effect simultaneously, but this can make the clamping piece only can move to the little direction in anchor eye under the drive of steel strand wires when reverse stretch-draw, is difficult to guarantee like this that the clamping piece can be absorbed in the anchor eye closely, perhaps wants to realize producing great relative displacement between auto-lock steel strand wires and the clamping piece thereby causes great prestressing force loss.
Disclosure of Invention
In order to solve the technical problem that current self-locking type prestressed anchorage cable auto-lock inefficiency and difficult realization, the utility model provides a can make auto-lock efficiency satisfy the engineering requirement basically to realize the auto-lock more easily, thereby promote self-locking type prestressed anchorage cable and obtain more extensive application, reduce the prestressing loss in the anchor rope, thereby save engineering cost and improve work efficiency's weak rock mass reinforcement type prestressed anchorage cable auto-lock ware.
In order to achieve the technical purpose, the technical proposal of the utility model is that,
a self-locking device of a reinforced prestressed anchor cable of a weak rock body comprises an anchorage device and a clamping piece; the anchor is in a block shape and is provided with an anchor hole for penetrating through the prestressed anchor cable, and the clamping piece is in a wedge shape and is arranged in the anchor hole and positioned between the prestressed anchor cable and the inner wall of the anchor hole; the clamping piece is fixedly connected with the ground tackle, a gap for containing the spring is reserved between the limiting plate and the ground tackle, and two ends of the spring are respectively fixed on the clamping piece and the limiting plate.
The length of the spring is not less than the distance from the limiting plate to the top end of the clamping piece, and the spring is compressed when the prestressed anchor cable is pretensioned.
The self-locking device for the reinforced prestressed anchor cable of the weak rock body further comprises a protective cover, wherein the protective cover is arranged between the limiting plate and the anchor, so that the spring and the clamping piece are sealed in the protective cover.
The self-locking device for the reinforced prestressed anchor cable of the weak rock body further comprises a self-locking steel pipe, wherein the self-locking steel pipe and the limiting plate are symmetrically arranged relative to the anchor, and the prestressed anchor cable penetrating through the anchor hole is covered in the self-locking steel pipe.
The self-locking device for the reinforced prestressed anchor cable of the weak rock body is characterized in that the side wall of the self-locking steel pipe is provided with at least one hole for allowing a grouting body in the self-locking steel pipe to overflow.
The self-locking device for the reinforced prestressed anchor cable of the weak rock body further comprises a centering steel plate, wherein the centering steel plate is arranged at the other end, opposite to the position of the anchor, of the self-locking steel pipe and is provided with a through hole matched with the outer diameter of the prestressed anchor cable.
According to the self-locking device for the reinforced prestressed anchor cable of the weak rock body, the limiting plate and the anchor are fixedly connected through the bolt and the nut.
The technical effect of the utility model lies in, the utility model discloses the clamping piece can be along with the anchor rope is pulled out partly when forward stretch-draw, the restoring force of spring can make the clamping piece more tightly be absorbed in the anchor eye during reverse stretch-draw, and welded steel pipe has increased the area of contact from locker and peripheral slip casting body behind special ground tackle, improve the transmission efficiency of the bonding stress of auto-lock steel pipe and peripheral slip casting body, finally transmit to the internal portion of ground, thereby self intensity that can the make full use of ground body accomplishes the anchor effect of prestressed anchorage cable, this stretch-draw locking that also more is favorable to realizing the anchor rope. Meanwhile, the whole process is mechanical and automatic, other external operations and manual control are not needed, and the construction process is simple and easy to implement.
The present invention will be further explained with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the embodiment of the present invention in forward tensioning;
fig. 2 is a schematic diagram of the embodiment of the present invention when performing reverse tensioning.
Detailed Description
In the embodiment, the self-locking device clip 5 is connected with the limiting steel plate 8 through the spring 9 for realizing self-locking, meanwhile, the limiting steel plate 8 and the special anchorage device 6 are connected into a whole through the bolt 4, and the self-locking device applied to the prestressed anchor rope 1 is welded with the self-locking steel pipe 3 at the back of the anchorage device 6. Referring to fig. 1, when the steel strand 1 is stretched in the forward direction, the clamping piece 5 is pulled out from the anchor hole for a certain length along with the stretched steel strand 1, and the spring 9 between the clamping piece 5 and the limiting steel plate 8 is compressed and deformed. Referring to fig. 2, after the tensioning end reaches the design requirement and the jack is unloaded, the retracted steel strand 1 is pushed into the anchor hole of the anchor 6 special for the self-locking device tightly under the elastic force of the spring 9, so as to complete self-locking, the distance between the anchor 6 and the limiting steel plate 8 is determined according to the restoring force of the spring 9, so as to ensure that the clip 5 is pushed into the pore channel of the anchor 6, the jack is unloaded, the steel pipe 3 is driven to move towards the reverse tensioning direction instantly, the force is transmitted to the grouting body through the friction between the steel pipe 3 and the peripheral grouting body, and finally the force is transmitted to the interior of the rock-soil body through the interface bonding strength of the grouting body and the rock-soil body, so that the self strength of the rock-soil body can be fully utilized to complete the anchoring effect of the prestressed anchor rope 1.
In the embodiment, the self-locking steel pipe 3 is used for positioning and transmitting the pulling force borne by the prestressed anchor cable 1 during reverse tensioning to the grouting body around the self-locking steel pipe 3, and in practical application, a plurality of channels for the grouting body in the self-locking steel pipe 3 to overflow the steel pipe can be drilled on the self-locking steel pipe 3 according to engineering requirements, so that the bonding strength between the self-locking steel pipe 3 and the peripheral grouting body can be increased. Also have the slip casting body in the self-locking steel pipe during because slip casting, drilling on the self-locking steel pipe is the passageway that overflows in order to give the slip casting body in the self-locking steel pipe, prevent to get into in the safety cover with the effect that influences the later stage locking, because slip casting pipe tip is sealed, so need punch on the slip casting pipe and let the slurry flow out, but there is the auto-lock spring in the safety cover, if the slip casting pipe also trompil this then the slip casting body will fill wherein and influence the auto-lock effect in this department, so the slip casting pipe is not trompil at the safety cover inside, the partial trompil outside the safety cover only of slip casting pipe promptly. When the self-locking protective cover is used, the self-locking steel pipe and the limiting steel plate can be sealed by using butter, and the hole part penetrating through the anchor hole of the steel strand is arranged on the limiting steel plate, so that the part of the grouting body entering the protective cover is prevented from influencing the self-locking effect. The special anchorage device 6 and the matched clamping piece 5 are used for locking the steel strand 1 through the steel strand 1 and the grouting pipe during reverse tensioning, and meanwhile, the special anchorage device 6 is also used as a stressed bearing body. The limiting steel plate 8 is used for fixing and limiting the positive displacement of the spring 9 and pushing the clip 5 into the conical hole by reacting force. The protective cover 7 is used for preventing slurry from entering the hole of the anchor 6 and the spring 9 during grouting to influence the later locking. The centering steel plate 2 is used for reducing the sagging of the steel strand 1 in the self-locking steel pipe 3 due to the dead weight so as to ensure that the anchor cable 1 is in a horizontal state during tensioning as much as possible, and the self-locking steel pipe can usually reach dozens of centimeters, so that the front and back retaining positions of the steel strand passing through the self-locking steel pipe are basically unchanged by additionally arranging a fixing piece behind the self-locking steel pipe according to the practical engineering experience, and the steel strand is prevented from being wound together or generating large sagging due to the dead weight.
Claims (7)
1. A self-locking device of a reinforced prestressed anchor cable of a weak rock body comprises an anchorage device and a clamping piece; the anchor is in a block shape and is provided with an anchor hole for penetrating through the prestressed anchor cable, and the clamping piece is in a wedge shape and is arranged in the anchor hole and positioned between the prestressed anchor cable and the inner wall of the anchor hole; the clamping piece is characterized by further comprising a limiting plate and a spring, wherein the limiting plate is fixedly connected with the anchorage device, a gap for containing the spring is reserved between the limiting plate and the anchorage device, and two ends of the spring are respectively fixed on the clamping piece and the limiting plate.
2. The self-locker of the prestressed anchor rope for soft rock mass reinforcement according to claim 1, wherein the length of the spring is not less than the distance from the limiting plate to the top end of the clamping piece, and is compressed when the prestressed anchor rope is pretensioned.
3. The weak rock mass reinforced prestressed anchor cable self-locking device as claimed in claim 1, further comprising a protective cover disposed between the limiting plate and the anchor to seal the spring and the clamping piece therein.
4. The self-locking device for the prestressed anchor cable of the weak rock body according to claim 1, further comprising a self-locking steel tube, wherein the self-locking steel tube and the limiting plate are symmetrically arranged relative to the anchor, and the prestressed anchor cable passing through the anchor hole is covered therein.
5. The self-locking device for the prestressed anchor cable in the weak rock mass according to claim 4, wherein the self-locking steel tube has at least one hole on its side wall for allowing the grout in the self-locking steel tube to overflow.
6. The self-locking device of the prestressed anchor cable in the weak rock mass according to claim 1, further comprising a centering steel plate, wherein the centering steel plate is arranged at the other end of the self-locking steel tube opposite to the anchor position and provided with a through hole matched with the external diameter of the prestressed anchor cable.
7. The self-locking device of the prestressed anchor cable for the weak rock mass, according to claim 1, wherein the limiting plate and the anchor are fixedly connected by bolts and nuts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120039741.6U CN214169054U (en) | 2021-01-08 | 2021-01-08 | Self-locking device for reinforced prestressed anchor cable of weak rock mass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120039741.6U CN214169054U (en) | 2021-01-08 | 2021-01-08 | Self-locking device for reinforced prestressed anchor cable of weak rock mass |
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| CN214169054U true CN214169054U (en) | 2021-09-10 |
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| CN202120039741.6U Active CN214169054U (en) | 2021-01-08 | 2021-01-08 | Self-locking device for reinforced prestressed anchor cable of weak rock mass |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115627756A (en) * | 2022-10-19 | 2023-01-20 | 中南大学 | Anchor cable reinforcing structure for treating deep loose body side slope and construction method |
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2021
- 2021-01-08 CN CN202120039741.6U patent/CN214169054U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115627756A (en) * | 2022-10-19 | 2023-01-20 | 中南大学 | Anchor cable reinforcing structure for treating deep loose body side slope and construction method |
| CN115627756B (en) * | 2022-10-19 | 2024-06-04 | 中南大学 | Anchor cable reinforcing structure for treating deep loose body slope and construction method |
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