阅读说明：本技术 耐高压型可回收锚杆及其施工方法 (High-pressure-resistant recyclable anchor rod and construction method thereof ) 是由 涂兵雄 林振德 贾金青 陈云彬 付文光 肖朝昀 王海涛 程强 程继宝 黄金狮 于 2020-06-19 设计创作，主要内容包括：本发明涉及耐高压型可回收锚杆,包括锚具、连接在锚具上的密封罩、连接在锚具上的套管、穿设在套管中并伸入密封罩内的筋体以及用于夹持筋体的锥状夹片,在锚具上设有与锥状夹片配合的锥形孔,在密封罩内设有套设锥状夹片的解锚板,解锚板能顶推锥状夹片向远离锚具方向进行轴向移动,还包括用于顶推解锚板轴向移动的顶板机构,顶板机构连接在解锚板上,顶板机构穿过锚具并延伸至锚具外。采用本发明的技术方案后,通过顶板机构推动解锚板,借助解锚板顶推出紧固锚杆筋体的锥状夹片,使锥状夹片与锚杯的锥形孔脱离,实现筋体的解锁,本发明具有装置可靠,结构简易的特点。本发明的施工方法,具有装置可靠,施工快捷的特点。(The invention relates to a high-pressure-resistant recoverable anchor rod, which comprises an anchor, a sealing cover connected to the anchor, a sleeve connected to the anchor, a rib penetrating in the sleeve and extending into the sealing cover, and a tapered clamping piece for clamping the rib, wherein a tapered hole matched with the tapered clamping piece is formed in the anchor, an anchor releasing plate sleeved with the tapered clamping piece is arranged in the sealing cover, the anchor releasing plate can push the tapered clamping piece to axially move in the direction away from the anchor, the high-pressure-resistant recoverable anchor rod also comprises a top plate mechanism for pushing the anchor releasing plate to axially move, the top plate mechanism is connected to the anchor releasing plate, and the top plate mechanism penetrates through the anchor and extends out of the anchor. After the technical scheme is adopted, the top plate mechanism pushes the anchor releasing plate, the conical clamping piece for fastening the anchor rod rib body is pushed by means of the anchor releasing plate, the conical clamping piece is separated from the conical hole of the anchor cup, and the rib body is unlocked. The construction method has the characteristics of reliable device and quick construction.)

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.

10. The construction method of a high pressure resistant type recoverable anchor rod of claim 9, wherein: the method comprises the following steps:

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 recyclable anchor rod;

D. anchor rod tensioning

Constructing a recoverable 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 conical 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 conical hole by the conical clamping piece, and the grouting body in the drill hole is extruded by the anchor device to provide 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.

Technical Field

The invention relates to a high-pressure-resistant recyclable anchor rod and a construction method thereof, belonging to the technical field of building construction.

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.

Disclosure of Invention

The invention aims to provide a recyclable anchor rod which is simple and reliable in structure, can be suitable for normal-pressure and high-pressure grouting environments and is an ultra-long rib body.

In order to achieve the purpose, the invention adopts the following technical scheme:

high pressure resistant recoverable stock, 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 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 outside the.

In a preferred form of the invention, the jacking plate mechanism includes a pressure tube and a piston rod movably disposed within the pressure tube, the piston rod extending out of the pressure tube and being connected to the anchorage release plate, the pressure tube being connected to the anchorage.

As a preferable mode of the invention, the anchor releasing plate is provided with a connecting rod groove and an anchor releasing hole, the connecting rod groove is arranged in the center of the anchor releasing plate, the piston rod comprises a cylindrical end and a T-shaped end, the cylindrical end is provided with a connecting groove thread, the T-shaped end is sleeved with a rubber ring, and the connecting groove thread is matched with the connecting rod groove.

As a preferable mode of the invention, the pressure pipe comprises a first pressure pipe and a second pressure pipe, the first pressure pipe is fixed on the anchorage device through a first external thread, the piston rod is arranged in the first pressure pipe, one end of the first pressure pipe, which is close to the anchorage release plate, is provided with a limiting cap, and the other end of the first pressure pipe is connected with the second pressure pipe through a second external thread.

As a preferred mode of the invention, the anchor comprises an anchor cup and a bearing plate, the tapered hole is arranged in the anchor cup, a bar penetrating hole is further formed in the anchor cup, a first internal thread is arranged in the bar penetrating hole, a cavity penetrating hole, a second internal thread and a third external thread are arranged on the bearing plate, the second internal thread is arranged on the inner wall of the cavity penetrating hole, the second internal thread is matched with the first external thread of the first pressure pipe, and the first internal thread is connected with the sleeve.

As a preferable mode of the present invention, the sealing cap includes a conical head, a partition plate, and a cylindrical wall, wherein a third internal thread is provided inside the cylindrical wall, and the third internal thread is provided in cooperation with the third external thread of the anchor.

As a preferable mode of the invention, the tapered clamping piece comprises a plurality of movable clamping pieces, the movable clamping pieces are bundled and sleeved together through an opening elastic steel bar, each movable clamping piece comprises a brim, a linear wall, a tapered wall, internal insections arranged on the inner side of the tapered wall, a fastening groove arranged on the outer wall of the linear wall and a convex ring arranged on the brim, the tapered wall is matched with a tapered hole of the anchor, a spring is arranged in the convex ring, one end of the spring abuts against the brim, and the other end of the spring abuts against the partition plate.

As a preferable mode of the invention, 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 tapered 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 tapered clamping piece, the outer diameter of the spring is 6-15mm smaller than the inner diameter of the convex ring, and the outer diameter of the spring is 6-10mm larger than the outer diameter of the rib body.

As a preferable mode of the present invention, the tapered wall of the tapered clip and the wall of the tapered hole in the anchor cup are coated with grease before installation or are padded with a tapered plastic sleeve having the same shape as the tapered hole.

The invention also provides a construction method of the high-pressure-resistant recyclable anchor rod, which comprises the following steps:

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 recyclable anchor rod;

D. anchor rod tensioning

Constructing a recoverable 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 conical 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 conical hole by the conical clamping piece, and the grouting body in the drill hole is extruded by the anchor device to provide 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 is adopted, the top plate mechanism pushes the anchor releasing plate, the conical clamping piece for fastening the anchor rod rib body is pushed by means of the anchor releasing plate, so that the conical clamping piece is separated from the conical 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 an anchor rod and the stretching, stretching and deformation of the rib body; the anchor releasing plate is completely sealed in the sealing cover, and can adapt to the high-pressure grouting environment. In the construction method, high-pressure gas or high-pressure water is injected into the pressure pipe, a piston rod in a first pressure pipe connected with the high-pressure pipe is pushed upwards, a conical clamping piece for fastening a rib body of the anchor rod is pushed out by means of the ejection of the anchor releasing plate, the conical clamping piece is separated from a conical hole of the anchor cup, and the rib body is unlocked.

Drawings

FIG. 1 is a cross-sectional view of the completed assembly of the present invention.

Fig. 2 is a cross-sectional view of the inner lock release device of the present invention.

Fig. 3 is an outline view of the anchor releasing plate of the present invention.

Fig. 4 is a cross-sectional view of the anchor breakplate of the present invention.

Fig. 5 is a profile view of a piston rod according to the present invention.

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

Fig. 7 is a view of the outer shape of the first pressure tube of the invention.

FIG. 8 is a cross-sectional view of a first pressure tube of the present invention.

FIG. 9 is an external view of an anchor according to the present invention.

Fig. 10 is a cross-sectional view taken at a-a of fig. 9 in accordance with the present invention.

FIG. 11 is an inside elevational view of a tapered clip according to the present invention.

FIG. 12 is an outside elevational view of a tapered clip according to 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 flexible reinforcement of the present invention.

FIG. 15 is a cross-sectional view of the closure of the present invention.

Fig. 16 is a cross-sectional view taken at B-B of fig. 15 in accordance with the present invention.

Fig. 17 is a cross-sectional view taken at C-C of fig. 15 in accordance with the present invention.

Fig. 18 is a cross-sectional view taken at D-D of fig. 15 in accordance with the present invention.

Fig. 19 is a cross-sectional view taken at E-E of fig. 15 in accordance with the present invention.

FIG. 20 is a schematic view of an anchor of the present invention employing three tendons.

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 an anchor of the present invention employing four tendons.

FIG. 23 is a schematic view of the outer shape 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 detailed description is made with reference to the embodiments. 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.

The construction method of the 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, and slightly abutting the partition plate 42 of the sealing cover 4 against the spring 5, thereby completing the assembly of the recyclable anchor rod;

D. anchor rod tensioning

Constructing a recoverable 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 conical clamping piece 3 by virtue of the friction action with the internal insections 34, so that the rib body 7 is fastened in the conical hole 211 by the conical 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 invention relates to a high pressure resistant recoverable anchor rod and a construction method thereof.A high pressure gas or high pressure water is injected into a pressure pipe 15, a piston rod 12 in a first pressure pipe 13 connected with the high pressure pipe is pushed upwards, a conical clamping piece 3 for fastening an anchor rod rib body is pushed out by means of an anchor releasing plate 11, the conical clamping piece 3 is separated from a conical hole 211 of an anchor cup 21, the rib body 7 is unlocked, and the rib body 7 can be automatically separated from the conical clamping piece 3 by pulling the rib body 7 under the action of external force due to a gap between the anchor releasing hole 111 of the anchor releasing plate 11 and the conical clamping piece 3, so that the rib body 7 is successfully pulled out, and the recovery purpose is realized. The invention adopts high-pressure gas or high-pressure water to unlock the anchor rod, and has the characteristics of reliable device and quick 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 an anchor rod and the stretching, stretching and deformation of the rib body 7; and the anchor releasing device 1 is completely sealed in the sealing cover 4, and can adapt to the environment of high-pressure grouting.

The product form of the present invention is not limited to the embodiments, and any suitable changes or modifications of the similar ideas by anyone should be considered as not departing from the patent scope of the present invention.