Expansion shell type radial grouting anchor pipe

Abstract

The invention belongs to the technical field of anchoring and supporting devices in constructional engineering, and relates to an expansion shell type radial grouting anchor pipe, a main body structure comprises an anchor rod body, an expansion shell anchor head arranged at the end of the anchor rod body and a connecting grouting ball valve, the expansion shell anchor head is composed of an inner wedge and an expansion shell piece arranged on the inner wedge, and the anchor rod body is novel in form and convenient to use. An anchor rod in a traditional anchoring and shotcreting support is designed into a hollow grouting pipe, the requirement for radial grouting and slurry conveying can be met, the hollow grouting pipe can serve as the anchor rod after radial grouting and serve as the anchoring and shotcreting support together with sprayed concrete and a reinforcing mesh, the water leakage position of the subsea tunnel can be blocked, the stratum can be reinforced, the stratum stability is improved, and the service life of the subsea tunnel is prolonged. And the shotcrete-anchor supporting construction and the radial grouting are carried out on the same working face at the same time, so that the construction time is saved, the operation efficiency is greatly improved, and the excavation progress in front of the tunnel is guaranteed.

Description

Technical field:

[0001] The invention belongs to the technical field of anchoring and supporting devices for construction projects, and relates to an expansion shell type radial grouting anchor pipe, which can carry out radial grouting while anchor rods are being applied, and is suitable for submarine tunnel construction. Background technology:

[0002] With the continuous development of the economy, the demand for cross-sea transportation is growing. Undersea tunnels have the advantages of being unaffected by typhoons and having little impact on the environment, making them the first choice for cross-sea transportation. However, due to the special geographical location and complex environmental conditions, undersea tunnels often pass through loose seabed sediments or other weak strata during construction, and the strata have poor stability and are prone to collapse or subsidence. In addition, undersea tunnels often face the challenge of high water pressure during construction, and the amount of water gushing out after tunnel excavation is large, which can easily lead to erosion and corrosion of the tunnel structure.

[0003] Radial grouting is an important construction technology in tunnel engineering. It is often used in submarine tunnels to improve stratum stability and reduce water leakage. After tunnel excavation, spray anchor support is usually required to ensure the stability of the surrounding rock. However, during the process of anchor driving, submarine tunnels are often accompanied by water gushing. In order to slow down the water gushing, radial grouting is required to seal the water outlet pores behind the surrounding rock. However, radial grouting takes up a large space and affects the excavation of the front of the tunnel.For example, Chinese Patent No. 201410097276.6 discloses a radial grouting anchor rod with advanced support, including a grouting connection pipe and a grouting stopper, the grouting connection pipe includes a core tube with a grouting channel provided inside, a grouting sleeve with a closed front end, and a grouting inlet sleeve, the grouting sleeve is connected to the front end of the core tube, the grouting inlet sleeve is connected to the rear end of the core tube, the grouting stopper surrounds the periphery of the grouting connection pipe, a discharge conduit is provided on the side wall of the front end of the grouting sleeve, a steel bar anchor rod body is fixedly connected to the front end of the grouting sleeve, a rubber exhaust pipe extending to the rear end of the grouting inlet sleeve is provided beside the front end of the grouting sleeve, an anchor head is provided at the front end of the steel bar anchor rod body, and a front end extending to the anchor head is provided on the steel bar anchor rod body. A plastic dual-purpose tube, the rear end of which is selectively connected to a discharge conduit and a rubber exhaust pipe, an end sealing tube A connected to the front end of a grouting channel of a core-connecting tube is sleeved in the slurry discharge casing, the front end of the end sealing tube A is closed and a slurry discharge hole A communicating with the inner cavity of the slurry discharge casing is provided on the side wall of the front end thereof, a rubber sleeve A wrapped around the outer periphery of the slurry discharge hole A is sleeved at the front end of the end sealing tube A, a slurry discharge hole C communicating with the inner cavity of the slurry discharge casing is provided on the side wall of the rear end of the slurry inlet casing, a rubber sleeve C wrapped around the outer periphery of the slurry discharge hole C is sleeved at the rear end of the slurry inlet casing, a detachable hollow anchor rod body is connected to the rear end of the slurry inlet casing, a slurry inlet pipe connected to the rear end of the grouting channel of the core-connecting tube is sleeved in the slurry inlet casing, and the rear end of the slurry inlet pipe is connected to There is a detachable anchor grouting pipe which is sleeved inside the hollow anchor body, the hollow anchor body passes through a pad, a fastening nut at the rear end of the pad is screwed on the hollow anchor body, a plastic exhaust pipe D is arranged on the side of the hollow anchor body, and the grouting plug comprises a rubber tube A, a rubber tube B and a rubber tube C which are sealed and connected together by a tee pipe, wherein the rubber tube B and the rubber tube C are wound side by side on the periphery of the grouting connection pipe to form a double helix multi-ring structure, the rubber tube A is connected to the front end of the straight tube on the tee pipe, the rubber tube C is connected to the rear end of the straight tube, the rubber tube A, the straight tube and the rubber tube C are sleeved on the periphery of the rubber exhaust pipe, and the front end of the rubber exhaust pipe protrudes from the front end of the rubber tube A, and the rear end of the rubber exhaust pipe protrudes from the rubber tube C At the rear end, the front end of the rubber tube A and the rear end of the rubber tube C are sealed and connected to the outer wall of the rubber exhaust pipe to form a cavity between the outer wall of the rubber exhaust pipe and the inner walls of the rubber tube A, the straight tube and the rubber tube C. The rear end of the rubber tube B is sleeved with an end sealing tube B with a closed front end. The rubber tube B is sealed and connected to the outer wall of the end sealing tube B. The front end of the end sealing tube B extends into the rubber tube B. The front end of the end sealing tube B is provided with a slurry outlet hole B and is sleeved with a rubber sleeve B wrapped around the slurry outlet hole B. The rear end of the end sealing tube B is connected to a pre-grouting pipe, and the rear end of the rubber exhaust pipe is connected to a plastic exhaust pipe C. The slurry stopper is fixed to the periphery of the grouting connecting pipe by fasteners respectively arranged on the front and rear ends of the rubber tubes B and C.Chinese patent 201811356836.X discloses a tunnel radial grouting device, including a sealing unit and a grouting unit, wherein the sealing unit is fixedly arranged on a concrete lining wall, the grouting unit penetrates the sealing unit and is arranged in a cavity outside the concrete lining wall, the grouting unit includes a first section grouting pipe, a plurality of middle grouting pipes, and a tail grouting pipe connected in sequence, a ball valve is arranged at the end of the tail grouting pipe, the ball valve is connected to a grouting hose, the end of the tail grouting pipe is exposed on the inner side of the concrete lining wall, the sealing unit includes a flange and a sealing gasket, the sealing gasket is arranged between the flange and the concrete lining wall, a circle of concentric bolt holes is processed on the flange, a mounting hole is processed at the center position, a sealing pipe is arranged in the mounting hole, a sealing cap is arranged at one end of the sealing pipe, and a reserved groove is arranged at one end of the sealing pipe that cooperates with the sealing cap, and a reserved groove is arranged at the end where the sealing pipe cooperates with the sealing cap. Several-shaped sealing layers are arranged in the groove, and the several-shaped sealing layers can be arranged in a single layer or in multiple layers. The front end of the first section of the grouting pipe is conical and the rear end is flat. The front end of the middle grouting pipe is provided with a joint guide pipe socket end, and the joint guide pipe socket end is connected with the joint guide pipe fixed end arranged on the inner wall of the middle grouting pipe as an integrated design. The rear end of the middle grouting pipe is flat, and the front end of the tail grouting pipe is provided with a joint guide pipe socket end, and the joint guide pipe socket end is connected with the joint guide pipe fixed end arranged on the inner wall of the tail grouting pipe as an integrated design. A connecting thread matching the ball valve is processed on the inner wall of the rear end of the tail grouting pipe. Grouting holes are processed in a plum blossom shape on the walls of the first section of the grouting pipe and the middle grouting pipe. The grouting holes are through holes, and the grouting holes are step holes converging from the outer wall to the inner wall. The grouting holes are filled with hand-coated shield tail sealing grease.Chinese Patent 202111324041.2 discloses a radial grouting device reserved behind a tunnel lining, comprising a grouting branch pipe, a built-in valve, a hollow rotating rod for exhaust, and a grouting hole pipe for radial grouting behind the lining of the tunnel; one end of the grouting hole pipe is a grouting port, and the other end is a grouting outlet for grouting into the leaking gap of the tunnel; a plurality of grouting holes are also provided on the side wall of the grouting hole pipe near the grouting outlet end, and a grouting branch pipe for grouting into the de-gassed gap of the tunnel is connected to the grouting hole; the hollow rotating rod is arranged in the grouting hole pipe along the axis of the grouting hole pipe, and the exhaust inlet of the hollow rotating rod is located at the grouting outlet The grouting port is slightly exposed, and the exhaust port is located at the grouting port; at least one built-in valve that can close or open the grouting port is arranged in the grouting hole tube, the built-in valve is installed on the hollow rotating rod and is located between the grouting port and the grouting hole, and the built-in valve includes a built-in valve large blade and a built-in valve small blade that fit up and down; an axial hole is arranged at the center of the circle of the built-in valve large blade and is sleeved on the hollow rotating rod, and the arc circle of the built-in valve large blade is fixedly connected to the inner wall of the grouting hole tube; the center of the circle of the built-in valve small blade is fixedly connected to the hollow rotating rod; the sum of the area of ​​the built-in valve small blade and the area of ​​the built-in valve large blade is larger than the area of ​​the grouting hole tube The inner circle area of ​​the hollow rotating rod is arranged in the grouting hole tube and can rotate relative to the grouting hole tube, the exhaust outlet of the hollow rotating rod is fixedly connected to the hollow handle, and an exhaust air duct outlet is arranged on the side wall of the grouting port end of the grouting hole tube corresponding to the position where the built-in valve is fully opened, and the hollow handle is connected to a detachable extension air pipe through the exhaust air duct outlet, and the exhaust inlet of the hollow rotating rod and the grouting outlet of the grouting branch pipe are both covered with elastic head covers, and a bowl-shaped fixing piece is arranged at the grouting port end of the grouting hole tube, and a through hole is arranged at the bottom of the bowl of the bowl-shaped fixing piece, and the grouting hole tube passes through the through hole and is fixedly connected to the bottom of the bowl, and the outer bowl eaves of the bowl top of the bowl-shaped fixing piece are connected to the tunnel The template for pouring lining is provided with a detachable connection, and the inner wall of the bowl-shaped fixing part and the outer wall of the grouting hole tube are filled with filling materials. A sealing part is provided on the outer wall of the grouting hole tube at the position corresponding to the position through the waterproof layer. The sealing part includes a fixed small washer, a first movable large washer, a second movable large washer and a locking nut which are sequentially sleeved on the grouting hole tube from the slurry outlet to the grouting outlet; the fixed small washer is fixed to the grouting hole tube, the first movable large washer and the second movable large washer are respectively used to set the leakage gap and the escape gap on both sides of the waterproof layer, and are locked by the locking nut, and the grouting hole tube and the hollow rotating rod are fixed pipe fittings or retractable pipe fittings. Therefore, a shell expansion radial grouting anchor pipe is developed and designed, and radial grouting is carried out while the spray anchor support is applied to the submarine tunnel, so as to timely block the water gushing channel and ensure that there is enough construction space for tunnel excavation. Summary of the invention:

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, develop and design a shell expansion type radial grouting anchor pipe, improve the bite between the grouting pipe and the surrounding rock during radial grouting and the operating efficiency, ensure the quality of radial grouting, and prevent tunnel collapse.

[0005] In order to achieve the above-mentioned purpose, the main structure of an expansion shell type radial grouting anchor pipe according to the present invention comprises an anchor rod body and an expansion shell anchor head arranged at its end and a connecting grouting ball valve, wherein the main structure of the expansion shell anchor head comprises an inner wedge and an expansion shell sheet arranged thereon;

[0006] The outer shell of the anchor body is a threaded structure, and the interior is a hollow structure, and the threaded structure is the same as that of the anchor;

[0007] The outside of the anchor body is also sleeved with a grout stopper, a pad and a nut;

[0008] The inner wedge is also provided with a grout overflow hole;

[0009] The number of the expansion pieces is at least 2, and they are able to slide in the wedge groove of the inner wedge.

[0010] The invention relates to an expansion shell type radial grouting anchor pipe which passes through an anchor rod body with a hollow structure and has both the supporting function of the anchor rod and the grouting function of a radial grouting pipe.

[0011] The engagement ability between the shell expansion type radial grouting anchor pipe and the surrounding rock is ensured by the shell expansion anchor head;

[0012] When using:

[0013] First, connect the shell expansion radial grouting anchor pipe to the grouting machine;

[0014] Then, insert the shell expansion radial grouting anchor pipe into the grouting hole, unfold the two shell expansion pieces, make them closely contact with the surrounding rock, bite, generate friction resistance with the anchor hole wall, and form support anchoring force;

[0015] Finally, grouting is performed through the hollow channel of the bolt body.

[0016] Compared with the prior art, the anchor rod body of the present invention is novel in form. The anchor rod in the traditional anchor spraying support is designed as a hollow grouting pipe, which can not only meet the requirements of radial grouting to transport slurry, but also can be used as an anchor rod and shotcrete and steel mesh as anchor spraying support after radial grouting. It can not only seal the water leakage position of the submarine tunnel, but also reinforce the stratum, improve the stratum stability, reduce the occurrence of accidents such as block falling and collapse, and carry out spraying anchor support and radial grouting on the same working surface at the same time, which saves construction time, greatly improves work efficiency, and ensures the excavation progress in front of the tunnel; its structure is simple, and the quality of radial grouting is further guaranteed by the engagement of the expansion shell anchor head with the surrounding rock through the expansion shell sheet and the friction between the inner wedge and the outer surface of the grouting anchor pipe, and the tensile strength of the pad fully guarantees the sealing effect of the grouting anchor pipe and the grouting plug on the grouting hole, so that the slurry fully fills the pores and cracks to prevent the slurry from overflowing. Description of the drawings:

[0017] Figure 1 It is a schematic diagram of the main structural principle of the present invention.

[0018] Figure 2 It is a schematic diagram of the main structure of the grouting joint involved in the present invention. Specific implementation method:

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Embodiment 1:

[0022] The main structure of a shell expansion type radial grouting anchor pipe involved in this embodiment is as follows Figure 1-Figure 2 As shown, it comprises an anchor rod body 1, an expansion shell anchor head 2, a grouting ball valve 3, a grouting stopper 4, a pad 5 and a nut 6; the outer shell is a threaded structure, and the front end of the anchor rod body 1 with a hollow structure inside is provided with an expansion shell anchor head 2, and the rear end is provided with a grouting ball valve 3, and the outer sleeve is provided with a grouting stopper 4 and a pad 5, and the grouting stopper 4 and the pad 5 are fastened and limited by a nut 6 provided on the anchor rod body 1;

[0023] The main structure of the expansion anchor head 2 includes an inner wedge 21, an expansion piece 22 and an overflow hole 23; two expansion pieces 22 with an angle of 180° are slidably arranged in the wedge groove of the inner wedge 21, and an overflow hole 23 is arranged at the end.

[0024] The material of the shell expansion type radial grouting anchor pipe involved in this embodiment is steel, except that the material of the grout stopper 4 is rubber;

[0025] The outer diameter of the anchor body 1 is 32 mm and the wall thickness is 5 mm;

[0026] The length of the expansion shell anchor head 2 is 150 mm, and it is threadedly connected to the anchor rod body 1 through the inner wedge 21, and the front two expansion shell pieces 22 are fixed by binding wires, wherein the diameter of the overflow hole 23 is 8 mm;

[0027] The length of the end thread 31 connected to the grouting ball valve 3 is 2-3 cm;

[0028] The length, width and thickness of the pad 5 are 150 mm, 150 mm and 6 mm respectively;

[0029] The size of the nut 6 is 40×23 mm.

[0030] The shell expansion radial grouting anchor pipe involved in this embodiment has a simple structure and operation, realizes the simultaneous application of anchor rods and radial grouting, ensures the stability of surrounding rock after submarine tunnel excavation, can deal with water gushing phenomenon in time, avoids affecting tunnel excavation progress due to excessive radial grouting space occupation, and ensures construction efficiency; when used:

[0031] First, the shell expansion radial grouting anchor pipe is connected to the grouting machine by connecting the grouting ball valve 3 and the grouting joint 10 through a threaded connection. One end of the grouting joint 10 with two extended spiral rods 11 is the grouting anchor pipe connection end 12, and the other end is the grouting machine connection end 13. The extended spiral rods 11 are provided to facilitate the installation and removal of the grouting joint and the shell expansion radial grouting anchor pipe.

[0032] Then, remove the binding wire of the shell expansion piece 22, insert the shell expansion radial grouting anchor pipe into the grouting hole, and rotate the anchor body 1 exposed outside the surrounding rock to unfold the two shell expansion pieces 22 and make close contact with the surrounding rock, bite, and generate friction resistance with the anchor hole wall to form a supporting anchoring force. When the anchor body 1 cannot be twisted, it proves that the shell expansion piece 22 is in close contact with the surrounding rock.

[0033] The backing plate 5 is fastened by the nut 6, so that one surface of the backing plate 5 is in close contact with the stop plug 4, the other surface is in close contact with the nut 6, and the side surface is in close contact with the rock surface;

[0034] Finally, grouting is performed, and the slurry passes through the grouting channel: the hollow channel of the anchor body 1 to reach the overflow hole 23;

[0035] The stopper 4 can effectively block the grouting hole during the grouting process to prevent the grout from overflowing from the grouting hole;

[0036] The pad 5 is in close contact with the surrounding rock during grouting, and is the last barrier between the grouting hole and the external environment. It has deformation ability and can prevent the anchor body 1 from being damaged by tension;

[0037] The grouting joint 10 is a shell-expanding radial grouting anchor pipe and a grouting machine connection device, the grouting anchor pipe connection end 12 is connected to the shell-expanding radial grouting anchor pipe, and the grouting machine connection end 13 is connected to the grouting machine, and can be reused.

[0038] Embodiment 2:

[0039] The shell expansion radial grouting anchor pipe involved in this embodiment aims at the problem that there is a large amount of water discharge during the construction of anchor rods in submarine tunnels, and the traditional radial grouting occupies a large space, which affects the excavation of the front of the tunnel. On the basis of ordinary anchor rods, the anchor rod is designed into a hollow anchor rod body 1, which serves as both a part of the spray anchor support and a radial grouting pipe;

[0040] The end of the anchor rod body 1: the expansion shell anchor head 2, which can improve the bite force between the radial expansion shell type radial grouting anchor pipe and the surrounding rock, and ensure the stability of the expansion shell type radial grouting anchor pipe in the grouting hole during radial grouting;

[0041] The grout stopper 4 blocks the end of the grouting hole to reduce the overflow of the grouting liquid and ensure that the grouting liquid fills the pores and cracks around the anchor body 1 and the grouting hole;

[0042] The backing plate 5 is in close contact with the surrounding rock through the nut 6, which can prevent the anchor body 1 from being tensilely damaged due to the solidification of the slurry.

Claims

1. A shell expansion radial grouting anchor pipe, characterized in that: The main structure includes an anchor rod body and an expansion anchor head arranged at its end and a connecting grouting ball valve. The expansion anchor head is composed of an inner wedge and an expansion sheet arranged thereon. The expansion sheet slides in the wedge groove of the inner wedge.

2. The shell expansion type radial grouting anchor pipe according to claim 1, characterized in that: The outside of the anchor rod body is also sleeved with a grout stopper, a pad and a nut.

3. The shell expansion type radial grouting anchor pipe according to claim 2, characterized in that: An overflow hole is also provided on the inner wedge.

4. The shell expansion type radial grouting anchor pipe according to claim 3, characterized in that: The number of expansion pieces is at least 2.

5. The shell expansion radial grouting anchor pipe according to any one of claims 1 to 4, characterized in that: The outer shell of the anchor body is a threaded structure, and the interior is a hollow structure with an outer diameter of 32mm and a wall thickness of 5mm; The length of the expansion shell anchor head is 150mm, which is threadedly connected to the anchor rod body through an inner wedge. The first two expansion shell pieces are fixed by tying iron wires, and the diameter of the overflow hole is 8mm. The length of the end thread connecting the grouting ball valve is 2-3cm; The length, width and thickness of the pad are 150mm, 150mm and 6mm respectively; The size of the nut is 40×23 mm.

6. The shell expansion type radial grouting anchor pipe according to claim 5, characterized in that: The hollow structure of the anchor rod body has both the supporting function of the anchor rod and the grouting function of the radial grouting pipe.

7. The shell expansion type radial grouting anchor pipe according to claim 5, characterized in that: When using: First, connect the shell expansion radial grouting anchor pipe to the grouting machine; Then, insert the shell expansion radial grouting anchor pipe into the grouting hole, unfold the two shell expansion pieces, make them closely contact with the surrounding rock, bite, generate friction resistance with the anchor hole wall, and form support anchoring force; Finally, grouting is performed through the hollow channel of the bolt body.

Images