CN112609697A

CN112609697A - Compression-resistant connecting structure for secondary splitting grouting and construction method

Info

Publication number: CN112609697A
Application number: CN202011340073.7A
Authority: CN
Inventors: 宋士琨; 田勇; 王大伟; 林国棋; 翟德荣; 刘继
Original assignee: Mingda Ocean Engineering Co ltd
Current assignee: Mingda Ocean Engineering Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-04-06

Abstract

The utility model belongs to the technical field of the technique of secondary splitting slip casting and specifically relates to a resistance to compression connection structure and construction method that secondary splitting slip casting is related to, it includes the inner tube, be provided with clamping device on the outer wall of inner tube, clamping device includes the clamping component that a plurality of clamping jaws and drive clamping jaw are close to the inner tube, and a plurality of clamping jaws distribute in the circumference of inner tube, and the one end of clamping jaw articulates at the middle part of inner tube, and the other end extends to the tip of inner tube, the tip of inner tube is provided with the sealing washer, the sealing washer cover is established on the lateral wall of inner tube. This application has and reduces slip casting pipe and defeated thick liquid union coupling and takes place the condition production that collapses out because of pressure is great easily.

Description

Compression-resistant connecting structure for secondary splitting grouting and construction method

Technical Field

The application relates to the technical field of secondary splitting grouting, in particular to a compression-resistant connecting structure of secondary splitting grouting and a construction method.

Background

The anchoring force of the prestressed anchor cable can be effectively improved by adopting a secondary high-pressure splitting grouting method, the secondary high-pressure splitting grouting is carried out when the strength of a cement bonded rock formed by primary grouting reaches 5.0MPa, and the grouting pressure is 0.5-1.5 MPa and reaches 2.0MPa at most; the grouting time is generally 20 minutes to 1 hour. And (3) bundling the secondary grouting pipe and the steel strand together, putting the two into the grouting pipe together when the anchor cable is placed, and directly utilizing the two during secondary high-pressure splitting grouting. And because the hole that secondary slip casting pipe lower extreme was opened is big and there is liquid level difference lower part pressure big, the lower part trompil is easily washed out by the thick liquid at first, has guaranteed to be opened from bottom to top trompil in proper order.

Before the secondary high-pressure splitting grouting is started, a grout conveying pipe on a high-pressure grouting machine is connected with the exposed part of a reserved secondary grouting pipe through a pipe joint so as to convey high-pressure cement grout into an anchor rod, the grout conveying pipe and the secondary grouting pipe are disassembled after the grouting is finished, and the part, exposed out of an anchor rod hole, of the secondary grouting pipe is cut off. When secondary high-pressure fracturing grouting is actually carried out, a weak point on a high-pressure cement slurry flowing pipeline is arranged between a secondary grouting pipe and a slurry conveying pipe, and the problem frequently occurs in practice that the interface of the two pipes bears huge impact force, and the two pipes are often cracked due to the strong impact force, so that great trouble is caused to the construction process.

Disclosure of Invention

In order to reduce the problem that grout pipe and defeated thick liquid union coupling department collapse out because of the great emergence of pressure is easy, this application provides a resistance to compression connection structure of secondary splitting slip casting.

The application provides a resistance to compression connection structure of secondary splitting slip casting adopts following technical scheme:

the utility model provides a resistance to compression connection structure of secondary splitting slip casting, includes the inner tube, be provided with clamping device on the outer wall of inner tube, clamping device includes the clamping component that a plurality of clamping jaws and drive clamping jaw are close to the inner tube, and a plurality of clamping jaws distribute in the circumference of inner tube, and the one end of clamping jaw articulates at the middle part of inner tube, and the other end extends to the tip of inner tube, the tip of inner tube is provided with the sealing washer, the sealing washer cover is established on the lateral wall of inner tube.

Through adopting above-mentioned technical scheme, during the use, set up the clamping jaw on the outer wall of inner tube, the clamping jaw is connected with clamping component, when removing the clamping jaw to the direction of inner tube through clamping component, it is intraductal that the inner tube inserts the secondary slip casting earlier, thereby clamping jaw cooperation inner tube is more firm to the connection of secondary slip casting pipe, set up the sealing washer at the tip of inner tube simultaneously, when the secondary slip casting is intraductal in the inner tube is inserted, seal between the secondary slip casting pipe of inner tube through the sealing washer, thereby the reduction takes place to collapse the condition of opening with secondary slip casting union coupling and takes place.

Preferably, clamping component includes the driving piece that the lantern ring and the inside pipe end portion of drive lantern ring removed, the lantern ring cover is located on the inner tube, the lantern ring has been seted up on the one side towards the clamping jaw and has been supported and establish the groove, the inner wall that supports and establish the groove sets up to the slope and leans on gradually to the middle part of the lantern ring to the other end by the lantern ring towards the one end of clamping jaw.

Through adopting above-mentioned technical scheme, the lantern ring cover is located on the inner tube, and when the driving piece removed the lantern ring to the direction of clamping jaw, what seted up on the lantern ring supports establishes the groove and can extrude the clamping jaw, makes the lantern ring can extrude a plurality of clamping jaws simultaneously.

Preferably, the tip of inner tube has seted up the annular, the sealing washer sets up in the annular, be provided with the extrusion ring in the annular, the chamfer has been seted up on the tip lateral wall that is close to the sealing washer on the extrusion ring, the extrusion ring is connected with the lantern ring.

By adopting the technical scheme, the sealing ring is arranged in the annular groove, and the chamfer arranged on the extrusion ring is abutted against the sealing ring, so that the sealing ring is extruded and sealed on the inner pipe and is connected with the secondary grouting pipe, and the sealing property between the inner pipe and the secondary grouting pipe is further improved.

Preferably, a plurality of push rods are arranged on the extrusion ring, one end of each push rod is fixed on the extrusion ring, the other end of each push rod extends towards the direction of the corresponding sleeve ring, one end, far away from the extrusion ring, of each push rod is connected with a spring, and the spring abuts between the corresponding sleeve ring and the corresponding push rod.

Through adopting above-mentioned technical scheme, be provided with the spring on the push rod, the spring is located between lantern ring and the push rod, makes the spring compression through the extrusion of lantern ring to the spring can extrude the extrusion ring, keeps the sealed of sealing washer.

Preferably, a connecting sleeve is arranged at a position, corresponding to the push rod, on the sleeve ring, the connecting sleeve is in threaded connection with the sleeve ring, and the spring abuts against the connecting sleeve.

By adopting the technical scheme, the connecting sleeve is in threaded connection with the sleeve ring, and when the connecting sleeve rotates, the abutting force of the connecting sleeve to the spring can be adjusted, so that the spring can push the extrusion ring to seal the sealing ring.

Preferably, the driving piece is a cam, the cam is rotatably connected to the side wall of the inner rod, the two cams are coaxially fixed, and the two cams are symmetrically arranged.

Through adopting above-mentioned technical scheme, the cam rotates to be connected on interior pole, and two coaxial fixes of cam, can be more stable when the cam carries out the butt to the lantern ring.

Preferably, the clamping jaw is provided with an embedded groove towards one surface of the lantern ring, a jacking block is arranged in the embedded groove, the jacking block is connected with an adjusting bolt through threads, and the adjusting bolt is located in the embedded groove.

Through adopting above-mentioned technical scheme, set up the tight piece in top in the caulking groove, be provided with adjusting bolt on the tight piece in top, be located the degree of depth of caulking groove to the tight piece in top through adjusting bolt to adjusting bolt can adjust the clamp force of clamping jaw.

Preferably, one face of the clamping jaw, which is far away from one end hinged with the inner pipe and faces the inner pipe, is arranged into an arc shape.

Through adopting above-mentioned technical scheme, the tip of clamping jaw is provided with the arc, when needs secondary slip casting pipe to insert between clamping jaw and the inner tube, secondary slip casting pipe accessible arc swiftly enters into between clamping jaw and the inner tube.

Preferably, two ends of the inner pipe are respectively provided with a clamping device.

Through adopting above-mentioned technical scheme, when the both ends of inner tube set up a clamping device respectively, can connect secondary slip casting pipe and defeated thick liquid pipe simultaneously fast through clamping device.

The application also provides a secondary splitting grouting construction method, which adopts the following technical scheme:

a secondary fracturing grouting construction method adopts a compression-resistant connecting structure for secondary fracturing grouting to connect a secondary grouting pipe.

Through adopting above-mentioned technical scheme, the structure of connecting secondary slip casting pipe is more firm, reduces the secondary slip casting pipe and takes place to collapse the condition of opening.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the clamping jaw is arranged on the outer wall of the inner pipe and connected with the clamping assembly, when the clamping jaw moves towards the direction of the inner pipe through the clamping assembly, the inner pipe is firstly inserted into the secondary grouting pipe, so that the clamping jaw is matched with the inner pipe to firmly connect the secondary grouting pipe, meanwhile, the sealing ring is arranged at the end part of the inner pipe, when the inner pipe is inserted into the secondary grouting pipe, the sealing ring is used for sealing the secondary grouting pipe of the inner pipe, and therefore the situation that the joint of the inner pipe and the secondary grouting pipe is cracked is reduced;

2. the clamping jaw is sleeved on the inner pipe through the lantern ring, when the lantern ring is moved towards the clamping jaw by the driving piece, the supporting groove formed in the lantern ring can extrude the clamping jaw, so that the lantern ring can extrude a plurality of clamping jaws simultaneously;

3. the sealing ring is arranged in the ring groove, and the chamfer angle formed on the extrusion ring is abutted to the sealing ring, so that the sealing ring is extruded and sealed on the inner pipe and is connected with the secondary grouting pipe, and the sealing property between the inner pipe and the secondary grouting pipe is further improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic view of a clamp assembly in full section;

FIG. 3 is a schematic view of a full section of a jaw;

fig. 4 is a schematic diagram of an explosive structure according to an embodiment of the present application.

Description of reference numerals: 01. a pulp conveying pipe; 02. a secondary grouting pipe; 1. an inner tube; 11. a ring groove; 12. a long groove; 2. a clamping device; 21. a clamping jaw; 211. a jacking block; 212. adjusting the bolt; 213. an insertion hole; 22. a clamping assembly; 221. a collar; 2211. abutting a groove; 222. a cam; 223. a through hole; 224. a handle; 2241. an L-shaped rod; 2242. an arcuate bar; 3. an extrusion ring; 31. chamfering; 4. a seal ring; 5. a push rod; 51. a push block; 52. a guide bar; 6. connecting sleeves; 7. a spring.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses resistance to compression connection structure of secondary splitting slip casting, be used for connecting defeated thick liquid pipe 01 and secondary slip casting pipe 02 of high pressure slip casting machine, refer to fig. 1, including inner tube 1, the both ends of inner tube 1 insert respectively in defeated thick liquid pipe 01 and secondary slip casting pipe 02, be provided with two clamping device 2 on the inner tube 1, two clamping device 2 press from both sides respectively on defeated thick liquid pipe 01 and secondary slip casting pipe 02's outer wall, simultaneously because the support of inner tube 1, inner tube 1 and the cooperation of clamping device 2 press from both sides tight to defeated thick liquid pipe 01 and secondary slip casting pipe 02, the fastness of being connected of inner tube 1 with defeated thick liquid pipe 01 and secondary slip casting pipe 02 has been improved, the probability that defeated thick liquid pipe 01 and secondary slip casting pipe 02 burst out takes place during the reduction slip casting. Or one end of the inner pipe 1 can be fixed on the slurry conveying pipe 01 in use, a clamping device 2 connected with the secondary grouting pipe 02 is arranged on the inner pipe 1, and the inner pipe 1 is taken out of the secondary grouting pipe 02 during disassembly.

Referring to fig. 1, the clamping device 2 includes a plurality of clamping jaws 21 and a clamping assembly 22 for driving the clamping jaws 21 to approach the inner pipe 1, and the plurality of clamping jaws 21 may be provided in two or more, in this embodiment three. The three clamping jaws 21 are distributed on the circumference of the circular tube and can be uniformly arranged. One end of the clamping jaw 21 is rotatably connected to the side wall of the inner pipe 1 and located in the middle of the inner pipe 1, the other end extends towards the end of the inner pipe 1, and after the inner pipe 1 is inserted into the slurry conveying pipe 01 and the secondary slurry injection pipe 02, the clamping assembly 22 rotates the clamping jaws 21 towards the inner pipe 1, so that the clamping jaws 21 abut against the outer walls of the slurry conveying pipe 01 and the secondary slurry injection pipe 02, and the slurry conveying pipe 01 and the secondary slurry injection pipe 02 are fixedly connected.

Referring to fig. 1, the clamping assembly 22 includes a collar 221 and a cam 222, a through hole 223 is formed in the middle of the collar 221, the diameter of the through hole 223 is equal to the outer diameter of the inner tube 1, or the joint between the inner tube 1 and the collar 221 may be set in a square shape, and the collar 221 is sleeved on the inner tube 1 through the through hole 223, so that the collar 221 can slide on the outer wall of the inner tube 1. A cam 222 is provided in the middle of the collar 221, and the cam 222 is rotatably coupled in the inner tube 1. When two clamping devices 2 need to be arranged, the cam 222 is symmetrically provided with two highest points and has a distance of 180 degrees, the cam 222 is connected with a handle 224, the handle 224 drives the cam 222 to rotate by rotating the handle 224, the highest points of the cam 222 are respectively abutted against the two lantern rings 221, and the two lantern rings 221 are respectively moved towards the two ends of the inner tube 1. In order to improve the stability of the pushing of the cam 222 to the collar 221, two cams 222 are arranged on the inner tube 1, the two cams 222 are symmetrically distributed on the circumferential direction of the inner tube 1, and the two cams 222 are coaxially arranged. Handle 224 and two cams 222 all fixed connection, handle 224 includes two L shape poles 2241 and an arc pole 2242, the one end cam 222 fixed connection of L shape pole 2241, the other end is used for connecting arc pole 2242, when handle 224 rotates, when making cam 222 drive the farthest position that lantern ring 221 removed, the curved centre of a circle that arc pole 2242 is the coincides with the central line of inner tube 1, and L shape pole 2241 keeps away from in cam 222 one side butt on the outer wall of lantern ring 221, make handle 224 fix a position, when the staff need open clamping jaw 21, lift handle 224 through holding arc pole 2242, thereby drive two cams 222 and rotate, make two cams 222 loosen lantern ring 221 simultaneously.

Referring to fig. 2, an abutting groove 2211 is formed in the middle of the collar 221, the abutting groove 2211 is located on the collar 221 and faces one end of the clamping jaw 21, the inner wall of the abutting groove 2211 is inclined, and when the collar 221 faces one end of the clamping jaw 21 and faces the other end, the distance from the inner wall of the abutting groove 2211 to the center line of the collar 221 is gradually reduced, when the collar 221 is close to the clamping jaw 21, the middle of the clamping jaw 21 abuts against the inclined inner wall of the abutting groove 2211, and in the process that the cam 222 abuts against the collar 221 in the direction of the clamping jaw 21, the position where the clamping jaw 21 abuts against the abutting groove 2211 is gradually moved to a position closer to the center line of the collar 221, so that the collar 221 can drive the clamping jaw 21 to gradually approach the inner tube 1 and is matched with the inner tube 1 to clamp and fix the pulp conveying tube 01 and the secondary pulp.

Referring to fig. 2 and 3, a tightening block 211 is arranged inside the clamping jaw 21, a caulking groove is formed on one surface of the clamping jaw 21, which is used for abutting against the sleeve ring 221, the tightening block 211 is embedded in the caulking groove, an adjusting bolt 212 is arranged at the bottom of the caulking groove, one end of the adjusting bolt 212 is in threaded connection with the tightening block 211, the other end of the adjusting bolt 212 is used for abutting against the bottom of the caulking groove, the bottom of the jacking block 211 is provided with an insertion hole 213, a spanner can be inserted into the insertion hole 213, the spanner corresponds to the adjusting bolt 212, so that the adjusting bolt 212 adjusts the depth of the jacking block 211 embedded into the caulking groove, when the abutting block 211 abuts against the abutting groove 2211, the depth of the abutting block 211 can be controlled by the collar 221 to adjust the abutting acting force of the clamping jaw 21, so that the collar 221 can make the clamping jaws 21 clamp the slurry conveying pipe 01 and the secondary slurry injecting pipe 02 under the action of the cam 222. Lie in that clamping jaw 21 keeps away from and sets up to the arc with inner tube 1 articulated one end, clamping jaw 21 is the arc and is in keeping away from the central line of keeping away from inner tube 1 articulated one end in inner tube 1, form to keeping away from the shape of 1 direction warpage in inner tube, thereby when clamping jaw 21 loosens, make things convenient for defeated thick liquid pipe 01 and secondary slip casting pipe 02 to enter into between clamping jaw 21 and the inner tube 1, clamping jaw 21 sets up to the arc simultaneously and can adapt to multiple defeated thick liquid pipe 01 and secondary slip casting pipe 02, arc direction evenly distributed who is along being to clamping jaw 21's tip is provided with many antislip strips, many antislip strips can increase the fixed fastness to defeated thick liquid pipe 01 and secondary slip casting pipe 02.

Referring to fig. 2 and 4, the side walls of the two ends of the inner pipe 1 are provided with ring grooves 11, the cross section of the ring grooves 11 is U-shaped, the ring grooves 11 are provided with sealing rings 4, the sealing rings 4 can be O-shaped, the ring grooves 11 are provided with extrusion rings 3 for extruding the sealing rings 4, the extrusion rings 3 are located in the ring grooves 11, the extrusion rings 3 are sleeved at the bottom of the ring grooves 11, meanwhile, one sides of the extrusion rings 3 facing the sealing rings 4 are provided with chamfers 31, the sealing rings 4 are located between the inclined surfaces of the chamfers 31, the inner walls of the ring grooves 11 and the inner walls of the slurry conveying pipe 01 or the secondary slurry injecting pipe 02, when the inner pipe 1 needs to be sealed with the slurry conveying pipe 01 or the secondary slurry injecting pipe 02, the extrusion rings 3 move towards the direction of the sealing rings 4, the chamfers 31 on the extrusion rings 3 extrude the sealing rings 4 between the slurry conveying pipe 01 or the secondary slurry injecting pipe 02, thereby sealing washer 4 is to the leakproofness between inner tube 1 and defeated thick liquid pipe 01 or the secondary slip casting pipe 02, and then when carrying out the slip casting to secondary slip casting pipe 02, can guarantee to add sufficient pressure in the secondary slip casting pipe 02.

Referring to fig. 2 and 4, the extrusion ring 3 is provided with three push rods 5, the push rods 5 are uniformly distributed on the circumferential direction of the extrusion ring 3, the side wall of the inner tube 1 is provided with a long groove 12, the long groove 12 is arranged along the length direction of the inner tube 1, the push rods 5 are in sliding fit in the long groove 12, and the long groove 12 is arranged on one side of the annular groove 11 close to the middle part of the inner tube 1, so that the push rods 5 extend from the end part of the inner tube 1 to the middle part of the inner tube 1. The push block 51 is fixedly arranged on the push rod 5, the push block 51 is arranged outside the long groove 12, and in the process of moving towards the end part of the inner pipe 1 through the sleeve ring 221, the sleeve ring 221 can generate acting force for squeezing the sealing ring 4 on the push block 51 in the moving process, so that the squeezing ring 3 and the clamping jaws 21 can be simultaneously acted through one sleeve ring 221, and the sealing and the fixing of the slurry conveying pipe 01 or the secondary slurry injection pipe 02 are completed.

Referring to fig. 2 and 4, a guide rod 52 is fixedly disposed on the push rod 5, a length direction of the guide rod 52 is parallel to a length direction of the elongated groove 12, a connecting sleeve 6 is disposed on the sleeve ring 221 at a position corresponding to the guide rod 52, the connecting sleeve 6 is sleeved on the guide rod 52, an inner diameter of the connecting sleeve 6 is equal to an outer diameter of the guide rod 52, the connecting sleeve 6 is in threaded connection with the sleeve ring 221, a spring 7 is disposed between the connecting sleeve 6 and the push block 51, the spring 7 is a compression spring, the spring 7 is sleeved on the guide rod 52, one end of the spring 7 abuts against the connecting sleeve 6, the other end abuts against the push block 51, when the sleeve ring 221 moves towards an end of the inner pipe 1 through the spring 7, the connecting sleeve 6 presses the spring 7, and the spring 7 pushes the push block 51 to move towards a direction of the. If the extrusion force of the extrusion ring 3 on the seal ring 4 is insufficient, the extrusion force of the spring 7 on the push block 51 can be adjusted when the connecting sleeve 6 moves toward the length direction of the connecting sleeve 6 by rotating the connecting sleeve 6.

The embodiment also discloses a secondary splitting grouting construction method, the pressure-resistant connecting structure of the secondary splitting grouting disclosed by the embodiment is adopted to connect the grout conveying pipe 01 and the secondary grouting pipe 02, the grout conveying pipe 01 and the secondary grouting pipe 02 are respectively sleeved at two ends of the inner pipe 1, then the cam 222 pushes the two sleeve rings 221 to move towards two ends of the inner pipe 1 by rotating the handle 224, the clamping jaws 21 are respectively clamped on the grout conveying pipe 01 and the secondary grouting pipe 02 by the sleeve rings 221, and meanwhile, the sleeve rings 221 push the extrusion rings 3 to extrude the sealing rings 4, so that the sealing rings 4 seal the space between the inner pipe 1 and the grout conveying pipe 01 and the secondary grouting pipe 02.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a resistance to compression connection structure of secondary splitting slip casting which characterized in that: including inner tube (1), be provided with clamping device (2) on the outer wall of inner tube (1), clamping device (2) include clamping component (22) that a plurality of clamping jaws (21) and drive clamping jaw (21) are close to inner tube (1), and a plurality of clamping jaws (21) distribute in the circumference of inner tube (1), and the one end of clamping jaw (21) articulates at the middle part of inner tube (1), and the other end extends to the tip of inner tube (1), the tip of inner tube (1) is provided with sealing washer (4), sealing washer (4) cover is established on the lateral wall of inner tube (1).

2. The secondary splitting-grouting pressure-resistant connection structure of claim 1, wherein: clamping component (22) include the driving piece that lantern ring (221) and drive lantern ring (221) removed to inner tube (1) tip, inner tube (1) is located to lantern ring (221) cover, set up on the one side of lantern ring (221) orientation clamping jaw (21) and support and establish groove (2211), support the inner wall of establishing groove (2211) and set up to the slope and lean on the middle part to the lantern ring (221) to the other end gradually by the one end of lantern ring (221) orientation clamping jaw (21).

3. The secondary fracturing grouting compression-resistant connecting structure according to claim 2, characterized in that: annular groove (11) have been seted up to the tip of inner tube (1), sealing washer (4) set up in annular groove (11), be provided with extrusion ring (3) in annular groove (11), chamfer (31) have been seted up on being close to sealing washer (4) on extrusion ring (3) the tip lateral wall, extrusion ring (3) are connected with the lantern ring (221).

4. The secondary splitting-grouting pressure-resistant connection structure of claim 3, wherein: be provided with a plurality of push rods (5) on extrusion ring (3), the one end of push rod (5) is fixed on extrusion ring (3), and the other end extends to the direction of lantern ring (221), one of extrusion ring (3) is kept away from in push rod (5) is served and is connected with spring (7), spring (7) butt is between lantern ring (221) and push rod (5).

5. The secondary splitting-grouting pressure-resistant connection structure of claim 4, wherein: the position that corresponds with push rod (5) on the lantern ring (221) is provided with adapter sleeve (6), adapter sleeve (6) threaded connection is on lantern ring (221), spring (7) butt is on adapter sleeve (6).

6. The secondary splitting-grouting pressure-resistant connection structure of any one of claims 2 to 5, wherein: the driving piece is a cam (222), the cam (222) is rotatably connected to the side wall of the inner rod, two cams (222) are coaxially fixed, and the two cams (222) are symmetrically arranged.

7. The secondary splitting-grouting pressure-resistant connection structure of any one of claims 2 to 5, wherein: the clamping jaw (21) has been seted up the caulking groove towards on the one side of lantern ring (221), be provided with in the caulking groove and push up tight piece (211), threaded connection has adjusting bolt (212) on pushing up tight piece (211), adjusting bolt (212) are located the caulking groove.

8. The secondary splitting-grouting pressure-resistant connection structure of claim 1, wherein: one surface of the clamping jaw (21), which is far away from one end hinged with the inner pipe (1) and faces the inner pipe (1), is arranged into an arc shape.

9. The secondary splitting-grouting pressure-resistant connection structure of claim 1, wherein: two ends of the inner pipe (1) are respectively provided with a clamping device (2).

10. A secondary splitting grouting construction method is characterized in that: the secondary grouting pipe (02) is connected by adopting the pressure-resistant connecting structure of the secondary split grouting of claim 1.