CN212452619U - High pressure resistant recoverable anchor rod - Google Patents

Abstract

The utility model relates to a recoverable stock of high pressure resistant type, including the ground tackle, connect the sealed cowling on the ground tackle, connect the sleeve pipe on the ground tackle, wear to establish in the sleeve pipe and stretch into the muscle body in the sealed cowling and be used for the taper clamping piece of centre gripping muscle body, be equipped with on the ground tackle with taper clamping piece complex bell mouth, be equipped with the anchor plate of separating of establishing the taper clamping piece of cover in the sealed cowling, it can push away the taper clamping piece and carry out axial displacement to keeping away from the ground tackle direction to separate the anchor plate, still including being used for pushing away to push away the roof mechanism of separating anchor plate axial displacement, roof mechanism connects on separating the anchor plate, the roof mechanism passes the ground. Adopt the technical scheme of the utility model afterwards, promote through roof mechanism and separate the anchor slab, release the taper clamping piece of fastening stock muscle body with the help of separating the anchor slab top, make the taper clamping piece break away from with the bell mouth of anchor cup, realize the unblock of muscle body, the utility model has the characteristics of the device is reliable, and the structure is simple and easy.

Description

High pressure resistant recoverable anchor rod

Technical Field

The utility model relates to a recoverable stock of high pressure resistant type belongs to construction technical field.

Background

The anchor rod is generally applied to foundation pit supporting engineering, and along with the acceleration of urban construction process, the environment that the foundation pit of newly-built building faces is more and more complicated, if next to existing building, peripheral planning has the subway line of waiting to build, and the foundation ditch excavation line is next to building red line etc. leads to traditional anchor rod can't normally be under construction in building red line, or because of can't demolish the muscle body after having under construction, leads to follow-up subway tunnelling seriously to be obstructed. Therefore, the recoverable anchor rod capable of recovering the rib body is researched and developed, sufficient anti-pulling force can be provided during foundation pit supporting, engineering safety is ensured, the anchor rod rib body can be pulled out and recovered after supporting engineering is finished, normal construction of a subsequent underground space is not affected, engineering cost can be greatly saved, and the construction period is shortened.

At present, the recoverable anchor rod mainly adopts a mechanical type and a hot melting type to realize the pulling recovery of a rib body, but the mechanical type needs manual unlocking, when the length of the rib body is longer, the rib body is extruded by grouting body, so that the recovery is difficult, and the pulling resistance bearing capacity of the anchor rod cannot be improved through high-pressure grouting; the hot melt formula is owing to settle the wire circular telegram in the sleeve pipe together with the muscle body, melts the anchor clamps unblock and realizes retrieving, however, at muscle body tensioning process, because there is the difference in the elastic elongation of muscle body and the elongation of wire, leads to easily in muscle body tensioning process that the wire breaks and can't melt anchor clamps and retrieve.

Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a structure is simple and easy reliable, can be applicable to the recoverable stock of the high pressure resistant type of ordinary pressure and high-pressure slip casting environment, the overlength muscle body, the utility model discloses a another aim at provides the construction method of this stock, and it has the advantage that the construction is swift, convenient operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a recoverable stock of high pressure resistant type, including the ground tackle, connect the sealed cowling on the ground tackle, connect the sleeve pipe on the ground tackle, wear to establish in the sleeve pipe and stretch into the muscle body in the sealed cowling and be used for the taper clamping piece of centre gripping muscle body, be equipped with on the ground tackle with taper clamping piece complex bell mouth, be equipped with the anchor plate of separating of establishing the taper clamping piece of cover in the sealed cowling, it can push away the taper clamping piece and carry out axial displacement to keeping away from the ground tackle direction to separate the anchor plate, still including being used for pushing away to push away the roof mechanism of separating anchor plate axial displacement, roof mechanism connects on separating the anchor plate, roof mechanism passes.

As an optimal mode of the utility model, roof mechanism includes the pressure pipe and sets up mobilizable piston rod in the pressure pipe, and the piston rod stretches out the pressure pipe and is connected to the anchor board of separating, and the pressure pipe is connected on the ground tackle.

As a preferred mode of the utility model, it is equipped with the connecting rod groove and separates the anchor eye to separate on the anchor board, the connecting rod groove sets up separate the center of anchor board, the piston rod includes cylindricality end and T shape end, and the cylindricality end is provided with even groove screw thread, and T type end overcoat has the rubber circle, even groove screw thread and connecting rod groove cooperation setting.

As the utility model discloses an optimal mode, the pressure pipe includes first pressure pipe and second pressure pipe, and first pressure pipe is fixed on the ground tackle through first external screw thread, the piston rod sets up in first pressure pipe, and first pressure pipe is close to the one end of separating the anchor slab is equipped with and is provided with spacing cap, and the other end of first pressure pipe passes through the second external screw thread and is connected with the second pressure pipe.

As a preferred mode of the utility model, the ground tackle includes anchor cup and bearing plate, the bell mouth sets up in the anchor cup, still is provided with the muscle hole of wearing in the anchor cup, wears the downthehole first internal thread that is provided with of muscle, is provided with on the bearing plate and wears accent, second internal thread and third external screw thread, and the second internal thread sets up on the inner wall of wearing the accent, the second internal thread with first pressure pipe first thread fit sets up, first internal thread with bushing.

As an optimized mode of the utility model, the sealed cowling includes conical head, baffle and drum wall, and drum wall inboard is provided with the third internal thread, the third internal thread with the third external screw-thread fit setting of ground tackle.

As an optimal mode of the utility model, the taper clamping piece includes a plurality of movable clamping pieces, and a plurality of movable clamping pieces bundle the cover through opening elastic reinforcement and are in the same place, and the activity clamping piece includes brim of a hat, straight line wall, toper wall, sets up at the inboard interior insection of toper wall, sets up the fastening groove at the outer wall of straight line wall and sets up the bulge loop at the brim of a hat, the toper wall with the bell mouth cooperation of ground tackle sets up, is equipped with the spring in the bulge loop, and the one end of spring is supported and is pushed up at the brim of a hat, and the other end supports and pushes up on the baffle.

As an optimal mode of the present invention, the inner diameter of the releasing anchor hole is larger than the pre-tightening of the cone-shaped clamping piece, the outer diameter of the straight wall is 10-20mm after the rib body, the inner diameter of the releasing anchor hole is smaller than the pre-tightening of the cone-shaped clamping piece, the outer diameter of the brim is 10-20mm after the rib body is pre-tightened by the cone-shaped clamping piece, the outer diameter of the spring is smaller than the inner diameter of the convex ring is 6-15mm, and the outer diameter of the spring is larger than the outer diameter of the rib body is 6-10 mm.

As an optimized mode of the utility model, the conical wall of the conical clamping piece and the anchor cup are provided with the hole wall of the conical hole before installation is coated with lubricating grease or is provided with the conical plastic sleeve with the same shape as the conical hole.

The utility model also provides a construction method of the recoverable stock of high pressure resistant type, including following step:

A. disanchoring device installation

Fixing the first pressure pipe on the anchorage device by screwing the first external thread of the first pressure pipe with the second internal thread of the cavity-through hole, and enabling the limit cap and the anchor cup to be on the same side; sleeving the rubber ring on the T-shaped end of the piston rod, aligning the cylindrical end of the piston rod with the first pressure pipe, jacking the cylindrical end of the piston rod into the first pressure pipe, and enabling the cylindrical end to extend out of the limiting cap; screwing the connecting rod groove of the anchorage release plate on the cylindrical end of the piston rod; rotating the anchor releasing plate to enable the anchor releasing hole of the anchor releasing plate to correspond to the reinforcement penetrating hole of the anchor, and pressing the anchor releasing plate to abut against the anchor cup; screwing the second pressure tube onto the second external thread of the first pressure tube;

B. installation of rib body

Penetrating the rib body into the rib penetrating hole of the bearing plate and penetrating the rib body out of the anchor cup; sleeving a plurality of conical clamping pieces bundled and sleeved by an open elastic steel bar into the bar body, penetrating through the anchor releasing holes of the anchor releasing plate, and pushing the conical wall tops of the conical clamping pieces into the conical holes of the anchor cup; adjusting the length of the rib body exposed out of the brim of the conical clamping piece; screwing the sleeve on the first internal thread of the bearing plate;

C. sealing boot mounting

Sleeving the spring on the rib body exposed out of the brim, positioning the spring in the convex ring of the conical clamping piece, sleeving the sealing cover on the anchor, fixing the sealing cover on the anchor in a screw connection mode through the third internal thread of the sealing cover and the third external thread of the anchor, and slightly abutting the partition plate of the sealing cover against the spring to finish the assembly of the high-pressure-resistant recyclable anchor rod;

D. anchor rod tensioning

Constructing a high-pressure-resistant recyclable anchor rod into a drill hole according to design requirements and completing grouting, wherein when the rib body is tensioned, the rib body pulls the tapered clamping piece by virtue of the friction action between the rib body and the internal insections, so that the rib body is fastened in the tapered hole by virtue of the tapered clamping piece, and the grouting body in the drill hole is extruded by virtue of the anchorage device to provide the anti-pulling force;

E. anchor rod recovery

After the anchor rod is used, firstly, the outer anchor is dismantled to complete unloading, at the moment, the rib body is in a tension releasing state, high-pressure air or high-pressure water is injected into the second pressure pipe through external equipment, the piston rod in the first pressure pipe is pushed to move upwards, the anchor disassembling plate is further made to move upwards and push the conical clamping piece, the conical clamping piece is made to be separated from the conical hole and separated from the rib body, and then the rib body is pulled out until the rib body is completely pulled out of the stratum, so that the rib body is recovered.

After the technical scheme of the utility model is adopted, the anchor releasing plate is pushed through the top plate mechanism, the tapered clamping piece for fastening the anchor rod rib body is pushed by means of the anchor releasing plate, so that the tapered clamping piece is separated from the tapered hole of the anchor cup, and the rib body is unlocked; in addition, the anchor releasing plate is separated from the rib body, so that the anchor releasing plate is not influenced by the construction length of the anchor rod and the stretching, extending and deforming of the rib body; just the utility model discloses an it seals completely in the sealed cowling to separate the anchor board, can adapt to the environment of high-pressure slip casting. The utility model discloses an among the construction method, utilize and inject high pressure gas or water under high pressure into the pressure pipe, make the piston rod in the first pressure pipe that is connected with the high-pressure pipe upwards push away, release the taper clamping piece of fastening stock rib body with the help of the anchor slab top of separating, make taper clamping piece and anchor cup bell mouth break away from, realize the unblock of rib body, owing to there is the clearance between anchor slab's the anchor hole of separating and the clamping piece, the pulling rib body can make taper clamping piece and rib body throw off automatically under the exogenic action to extract the rib body smoothly, realize retrieving the purpose, the utility model discloses owing to adopt high pressure gas or water under high pressure to carry out the stock unblock, it is reliable to have the device, the swift characteristics.

Drawings

Fig. 1 is a sectional view of the present invention after assembly.

Fig. 2 is a sectional view of the inner unlocking device of the present invention.

Fig. 3 is the appearance of the anchor releasing plate of the utility model.

Fig. 4 is a sectional view of the anchor releasing plate of the present invention.

Fig. 5 is an outline view of the piston rod of the present invention.

Fig. 6 is an outline view of the rubber ring of the present invention.

Fig. 7 is a schematic view of a first pressure tube according to the present invention.

Fig. 8 is a sectional view of the first pressure tube of the present invention.

FIG. 9 is a view showing the shape of the anchor of the present invention.

Fig. 10 is a cross-sectional view taken along line a-a of fig. 9 according to the present invention.

Fig. 11 is an inner vertical view of the tapered clip of the present invention.

Fig. 12 is an outside elevation view of the tapered clip of the present invention.

Fig. 13 is a top view of the tapered clip holding ribs of the present invention.

Fig. 14 is a top view of the open elastic reinforcement of the present invention.

Fig. 15 is a cross-sectional view of the sealing cap of the present invention.

Fig. 16 is a cross-sectional view taken along line B-B of fig. 15 according to the present invention.

Fig. 17 is a cross-sectional view taken along line C-C of fig. 15 according to the present invention.

Fig. 18 is a cross-sectional view taken along line D-D of fig. 15 according to the present invention.

Fig. 19 is a cross-sectional view taken along line E-E of fig. 15 according to the present invention.

Fig. 20 is an outline view of the anchor device using three ribs of the present invention.

Fig. 21 is an outline view of the anchor releasing plate for recovering three tendons according to the present invention.

FIG. 22 is a schematic view of the anchor device using four tendons according to the present invention.

Fig. 23 is an outline view of the anchor releasing plate for recovering four tendons according to the present invention.

In the figure:

1 unlocking device 11 anchor releasing plate

111-mooring hole 112 connecting rod groove

12 cylinder end of piston rod 121

122T-shaped end 123 with groove thread

124 rubber ring 13 first pressure pipe

131 first external thread 132 second external thread

133 second pressure tube of limit cap 14

15 pressure pipe

2 anchor 21 anchor cup

211 taper hole 212 rib-penetrating hole

213 first internal thread 22 bearing plate

221 through bore 222 second internal thread

223 third external thread

3 tapered clip 30 movable clip

31 brim 32 straight wall

33 internal thread of conical wall 34

35 fastening groove 36 convex ring

37-opening elastic steel bar

4 sealing cover 41 conical head

42 partition 43 cylindrical wall

431 third internal thread

5 spring

6 casing

7 tendon body

Detailed Description

In order to further explain the technical solution of the present invention, the following embodiments are described in detail.

Referring to fig. 1-23, the high pressure resistant recyclable anchor rod comprises an unlocking device 1, an anchor 2, a conical clamping piece 3, a sealing cover 4, a spring 5, a sleeve 6 and a rib 7.

The unlocking device 1 comprises an unlocking plate 11, a piston rod 12 and a pressure pipe 15, wherein the piston rod 12 and the pressure pipe 15 form a top plate mechanism for abutting against the unlocking plate 11. The pressure pipe 15 includes a first pressure pipe 13 and a second pressure pipe 14. An anchor releasing hole 111 is annularly arranged on the anchor releasing plate 11, and a connecting rod groove 112 is arranged in the center of the anchor releasing plate 11. The piston rod 12 is composed of a cylindrical end 121 and a T-shaped end 122, the cylindrical end 121 is provided with a groove connecting thread 123, a rubber ring 124 is sleeved outside the T-shaped end 122, the groove connecting thread 123 is matched with the connecting rod groove 112 on the anchorage release plate 11 for use, and the T-shaped end 122 is arranged in the first pressure pipe 13. The first pressure pipe 13 is fixed on the anchorage device 2 through a first external thread 131 on the upper part, one end of the first pressure pipe 13 along the axial direction is provided with a limiting cap 133, the other end of the first pressure pipe 13 along the axial direction is provided with a second external thread 132, and the second external thread 132 is connected with the second pressure pipe 14.

The anchorage device 2 is composed of an anchor cup 21 and a bearing plate 22, and the anchor cup 21 and the bearing plate 22 are integrally formed. Be provided with bell mouth 211 and wear muscle hole 212 in the anchor cup 21, be provided with first internal thread 213 in wearing muscle hole 212, be provided with wear chamber hole 221, second internal thread 222 and third external screw thread 223 on the pressure-bearing plate 22, second internal thread 222 sets up on the inner wall of wearing chamber hole 221, second internal thread 222 with first pressure pipe 13 first external screw thread 131 cooperatees, first internal thread 213 with sleeve 6 is connected.

The sealing cover 4 consists of a conical head 41, a partition plate 42 and a cylindrical wall 43, the partition plate 42 is arranged in the cylindrical wall 43, a third internal thread 431 is arranged on the inner side of the cylindrical wall 43, and the third internal thread 431 is matched with the third external thread 223 of the anchorage device 2.

The conical clamping pieces 3 comprise a plurality of movable clamping pieces 30, the movable clamping pieces 30 are provided with a cap edge 31, a linear wall 32, a conical wall 33, internal threads 34, a fastening groove 35 and a convex ring 36, the linear wall 32 is arranged between the cap edge 31 and the conical wall 33, the fastening groove 35 is arranged on the linear wall 32, the internal threads 34 are arranged on the inner wall of the movable clamping pieces 30, the conical wall 33 is matched with the conical hole 211 of the anchor device 3, and the inner diameter of the convex ring 36 is slightly larger than the outer diameter of the spring 5.

Preferably, the tapered wall 33 of the tapered clip 3 and the wall of the tapered hole 211 of the anchor cup 21 are coated with grease before installation or are padded with a tapered plastic sleeve having the same shape as the tapered hole 211, so that the tapered clip 3 and the tapered hole 211 are easily separated during unlocking.

Preferably, after the conical clamping piece 3 pre-tensions the rib body 7 and the sealing cover 4 to be screwed on the anchorage device 2, the spring 5 lightly abuts against the partition plate 42 of the sealing cover 4, the spring 5 is compressed by 2-10mm, and the length of the spring 5 is 50-100 mm.

Preferably, the inner diameter of the anchoring release hole 111 is 10-20mm larger than the outer diameter of the straight wall 32 after the rib body 7 is pre-tightened by the tapered clamping piece 3, and the inner diameter of the anchoring release hole 111 is 10-20mm smaller than the outer diameter of the cap edge 31 after the rib body 7 is pre-tightened by the tapered clamping piece 3.

Preferably, after the rib 7 is pre-tightened by the tapered clamping pieces 31, the outer diameter of the spring 5 is 6-15mm smaller than the inner diameter of the convex ring 37, and the outer diameter of the spring 5 is 6-10mm larger than the outer diameter of the rib 7.

A construction method of a high-pressure-resistant recyclable anchor rod comprises the following steps:

A. disanchoring device installation

Fixing the first pressure pipe 13 on the anchor 2 by screwing the first external thread 131 of the first pressure pipe 13 with the second internal thread 222 of the cavity-through hole 221, and enabling the limiting cap 133 to be on the same side as the anchor cup 21; sleeving the rubber ring 124 on the T-shaped end 122 of the piston rod 12, aligning the cylindrical end 121 of the piston rod 12 with the first pressure tube 13, jacking the cylindrical end 121 into the first pressure tube 13, and extending the cylindrical end 121 out of the limiting cap 133; screwing the link groove 112 of the anchorage release plate 111 on the cylindrical end 121 of the piston rod 12; rotating the anchorage release plate 11 to enable the anchorage release hole 111 of the anchorage release plate 11 to correspond to the reinforcement penetrating hole 212 of the anchorage device 2, and pressing the anchorage release plate 11 to abut against the anchor cup 21; threading the second pressure tube 14 onto the second external threads 132 of the first pressure tube 13;

B. installation of rib body

The rib body 7 is penetrated into the rib penetrating hole 212 of the pressure bearing plate 22 and is penetrated out of the anchor cup 21; a plurality of movable clamping pieces 30 bundled and sleeved by an open elastic steel bar 36 form a conical clamping piece 3, the conical clamping piece 3 is sleeved in the rib body 7 and penetrates through the anchor releasing hole 111 of the anchor releasing plate 11, and the conical wall 33 of the conical clamping piece 3 is pushed into the conical hole 212 of the anchor cup 21; adjusting the length of the rib 7 exposed out of the brim 31 of the cone-shaped clamping piece 3; screwing the sleeve 6 on the first internal thread 213 of the bearing plate 22;

C. sealing boot mounting

Sleeving the spring 5 on the rib 7 exposed out of the brim 31, positioning the spring 5 in the convex ring 37 of the conical clamping piece 3, sleeving the sealing cover 4 on the anchorage device 2, and fixing the sealing cover 4 on the anchorage device 2 by screwing the third internal thread 431 of the sealing cover 4 with the third external thread 223 of the anchorage device 2, so that the sealing cover 4 is fixed on the anchorage device 2, and the partition plate 42 of the sealing cover 4 slightly abuts against the spring 5, thus completing the assembly of the high-pressure-resistant recyclable anchor rod;

D. anchor rod tensioning

Constructing a high-pressure-resistant recyclable anchor rod into a drill hole according to design requirements and completing grouting, wherein when the rib body 7 is tensioned, the rib body 7 pulls the tapered clamping piece 3 by virtue of the friction action with the internal insections 34, so that the rib body 7 is fastened in the tapered hole 211 by the tapered clamping piece 3, and the grouting body in the drill hole is extruded by the anchor device 2 to provide anti-pulling force;

E. anchor rod recovery

After the anchor rod is used, firstly, an external anchor (not shown in the figure) is detached to finish unloading, at the moment, the rib body 7 is in a tension releasing state, high-pressure air or high-pressure water is injected into the second pressure pipe 14 through external equipment, the piston rod 12 in the first pressure pipe 13 is pushed to move upwards, and as the anchor plate 11 is separated from the piston rod 12, the anchor plate 11 is further moved upwards to push the conical clamping piece 3 to move upwards, so that the conical clamping piece 3 is separated from the conical hole 211 and separated from the rib body 7, and then the rib body 7 is pulled out to be completely pulled out from the stratum, namely, the recovery of the rib body 7 is realized.

The utility model relates to a recoverable stock of high pressure resistant type and construction method thereof, utilize and inject high pressure gas or water under high pressure into pressure pipe 15, make the piston rod 12 in the first pressure pipe 13 that is connected with the high-pressure tube top push, with the help of separating anchor plate 11 top push out the taper clamping piece 3 of fastening stock rib body, make taper clamping piece 3 break away from with the bell mouth 211 of anchor cup 21, realize the unblock of rib body 7, because there is the clearance between the anchor hole 111 of separating of anchor plate 11 and the taper clamping piece 3, the pulling rib body 7 can make taper clamping piece 3 and rib body 7 automatic disengagement under the exogenic action, thereby extract rib body 7 smoothly, realize the recovery purpose. The utility model adopts high pressure gas or high pressure water to unlock the anchor rod, and has the characteristics of reliable device and rapid construction; in addition, the unlocking device 1 is separated from the rib body 7, so that the unlocking device is not influenced by the construction length of the anchor rod and the stretching, extending and deforming of the rib body 7; just the utility model discloses an it is sealed completely in sealed cowling 4 to untie anchor device 1, can adapt to the environment of high-pressure slip casting.

The product form of the present invention is not limited to the embodiment of the present invention, and any person can properly change or modify the product form of the present invention without departing from the scope of the present invention.

Claims (9)

1. High pressure resistant recoverable stock, its characterized in that: including the ground tackle, connect the sealed cowling on the ground tackle, connect the sleeve pipe on the ground tackle, wear to establish in the sleeve pipe and stretch into the muscle body in the sealed cowling and be used for the taper clamping piece of centre gripping muscle body, be equipped with on the ground tackle with taper clamping piece complex bell mouth, be equipped with the anchor plate of separating of establishing the taper clamping piece in the sealed cowling, it can push away the taper clamping piece and carry out axial displacement to keeping away from the ground tackle direction to separate the anchor plate, still including being used for pushing away to separate the roof mechanism of anchor plate axial displacement, roof mechanism connects on separating the anchor plate, roof mechanism passes the ground tackle and extends to outside the ground.

2. A high pressure resistant retrievable rock bolt according to claim 1, wherein: the top plate mechanism comprises a pressure pipe and a movable piston rod arranged in the pressure pipe, the piston rod extends out of the pressure pipe and is connected to the anchor releasing plate, and the pressure pipe is connected to the anchor.

3. A high pressure resistant retrievable rock bolt according to claim 2, wherein: the connecting rod groove and the anchor releasing hole are formed in the anchor releasing plate, the connecting rod groove is formed in the center of the anchor releasing plate, the piston rod comprises a cylindrical end and a T-shaped end, a connecting groove thread is formed in the cylindrical end, a rubber ring is sleeved outside the T-shaped end, and the connecting groove thread is matched with the connecting rod groove.

4. A high pressure resistant retrievable rock bolt according to claim 3, wherein: the pressure pipe includes first pressure pipe and second pressure pipe, and first pressure pipe passes through first external screw thread to be fixed on the ground tackle, the piston rod sets up in first pressure pipe, and first pressure pipe is close to the one end of separating the anchor slab is equipped with and is provided with spacing cap, and the other end of first pressure pipe passes through the second external screw thread and is connected with the second pressure pipe.

5. A high pressure resistant retrievable rock bolt according to claim 4, wherein: the ground tackle includes anchor cup and bearing plate, the bell mouth sets up in the anchor cup, still is provided with in the anchor cup and wears the muscle hole, wears to wear to be provided with first internal thread in the muscle hole, is provided with on the bearing plate and wears accent, second internal thread and third external screw thread, and the second internal thread sets up on the inner wall of wearing the accent, the second internal thread with first pressure pipe first external screw thread fit sets up, first internal thread with the bushing.

6. A high pressure resistant retrievable rock bolt according to claim 5, wherein: the sealing cover comprises a conical head, a partition plate and a cylindrical wall, wherein a third internal thread is arranged on the inner side of the cylindrical wall, and the third internal thread is matched with a third external thread of the anchor device.

7. A high pressure resistant retrievable rock bolt according to claim 6, wherein: the taper clamping piece comprises a plurality of movable clamping pieces, the movable clamping pieces are bundled and sleeved together through the opening elastic steel bar, each movable clamping piece comprises a cap edge, a linear wall, a conical wall, inner insections arranged on the inner side of the conical wall, fastening grooves arranged on the outer wall of the linear wall and a convex ring arranged on the cap edge, the conical wall is matched with a conical hole of the anchor, a spring is arranged in the convex ring, one end of the spring abuts against the cap edge, and the other end of the spring abuts against the partition plate.

8. A high pressure resistant retrievable rock bolt according to claim 7, wherein: the inner diameter of the anchor releasing hole is 10-20mm larger than the outer diameter of the straight wall after the rib body is pre-tightened by the cone-shaped clamping piece, the inner diameter of the anchor releasing hole is 10-20mm smaller than the outer diameter of the cap edge after the rib body is pre-tightened by the cone-shaped clamping piece, the outer diameter of the spring is 6-15mm smaller than the inner diameter of the convex ring after the rib body is pre-tightened by the cone-shaped clamping piece, and the outer diameter of the spring is 6-10mm larger than the outer diameter of the rib body.

9. A high pressure resistant retrievable rock bolt according to claim 8, wherein: before installation, the conical wall of the conical clamping piece and the hole wall of the conical hole in the anchor cup are coated with lubricating grease or padded with a conical plastic sleeve with the same shape as the conical hole.

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