In-hole locking grouting device and method

Abstract

The invention discloses an in-hole locking grouting device and method. The device comprises a grouting pipe and a locking structure sleeved outside the grouting pipe, the locking structure comprises an upper connecting piece, a lower connecting piece and a deformable locking piece, the upper connecting piece is connected to the top of the deformable locking piece, the lower connecting piece is connected to the bottom of the deformable locking piece, the grouting pipe is a hollow pipe open at the top and bottom and provided with an external thread on the surface, the upper connecting piece and the lower connecting piece are both threadedly connected to the grouting pipe, and the pitch of the threaded connection between the grouting pipe and the upper connecting piece is smaller than the pitch of the threaded connection between the grouting pipe and the lower connecting piece; the method comprises: forming a grouting hole by drilling; installing the locking structure in a contracted state into the grouting hole; passing the grouting pipe through the locking structure, and when the grouting pipe is rotated downward, the deformable locking piece expands and expands outwards to fit tightly with the grouting hole wall; the grouting pipe is connected to the grouting equipment to perform grouting; the invention solves the problem of slippage and falling off of the grouting conduit, which affects the grouting effect.

Description

Technical Field

[0001] The present invention relates to the technical field of grouting in geotechnical engineering, and particularly relates to a hole-internal locking grouting device and method. Background Art

[0002] With the rapid economic development, a large number of newly built and existing infrastructure facilities are increasing. For example, the mileage of road projects increases significantly every year, and the number of underground infrastructure facilities such as tunnels is increasing day by day. Due to improper preliminary design and construction or later maintenance, diseases gradually appear, such as cracks in concrete structures, voids and cavities in roads, subsidence of pipelines, and settlement of high-speed railway track slabs, which seriously affect engineering safety and daily life. When these problems occur, it is often necessary to treat the diseases, and trenchless grouting is currently the main commonly used method.

[0003] Existing grouting devices, such as a slurry controllable rotary grouting head and grouting method with the patent number 202110948644.3, a rotary grouting head, cuts the soil by rotating the grouting head, making a controllable cavity appear in the soil of the pile body. Compared with traditional grouting, it effectively overcomes the disadvantages of traditional grouting, such as difficult control of slurry flow and low slurry utilization rate. However, for the treatment of diseases such as reinforcement and uplift, high-pressure grouting is often used, which requires a very high connection stability of the grouting device. Conventional inserted grouting heads or simple externally added leather sleeve grouting devices cannot meet the requirements of high-pressure grouting, and the entire grouting structure is unstable, affecting the efficiency and effect of grouting. Summary of the Invention

[0004] The purpose of the invention is to provide a hole-internal locking grouting device and method, which solves the problems that when treating diseases such as reinforcement and uplift by using high-pressure grouting, conventional inserted grouting heads or simple externally added leather sleeve grouting devices cannot meet the requirements of high-pressure grouting, cannot ensure the quality of engineering repair, cause waste of slurry materials, affect the efficiency and effect of grouting, and even lead to safety accidents.

[0005] The present invention is realized as follows. A hole-internal locking grouting device, the device includes a grouting pipe and a locking structure sleeved outside the grouting pipe.

[0006] The locking structure includes an upper connecting piece, a lower connecting piece and a deformable locking piece. The upper connecting piece is connected to the top of the deformable locking piece, and the lower connecting piece is connected to the bottom of the deformable locking piece. The grouting pipe is a hollow pipe that is open at both the top and the bottom and has an external thread on its surface. Both the upper connecting piece and the lower connecting piece are threadedly connected to the grouting pipe. The pitch of the threaded connection between the grouting pipe and the upper connecting piece is smaller than the pitch of the threaded connection between the grouting pipe and the lower connecting piece. When the grouting pipe is rotated, the deformable locking piece expands or contracts.

[0007] The thread directions on the grouting pipe are the same. When rotating the grouting pipe, since the pitch at the threaded connection between the grouting pipe and the upper connecting piece is smaller than the pitch at the threaded connection between the grouting pipe and the lower connecting piece, the upper connecting piece and the lower connecting piece move in the same direction. However, due to the different pitches, when rotating the grouting pipe, the moving distance of the lower connecting piece is greater than that of the upper connecting piece. By changing the rotation direction of the grouting pipe, the expansion or contraction of the deformation locking piece is realized. When the deformation locking piece is under the contraction effect, it is convenient to install it into the grouting hole. After entering the grouting hole, continue to rotate the grouting pipe to make the upper connecting piece and the lower connecting piece move upward, so as to realize the expansion and outward expansion of the deformation locking piece, which is closely attached to the inner wall of the grouting hole to complete the locking, and the position of the grouting pipe is fixed to ensure the grouting effect.

[0008] Both the upper connecting piece and the lower connecting piece are nuts, and the inner wall is provided with internal threads that match the grouting pipe. The upper connecting piece, the deformation locking piece, and the lower connecting piece are integrally formed by welding.

[0009] A further technical solution of the present invention is that the deformation locking piece includes a tapered portion, an expandable ring, and a cylindrical portion connected in sequence. The expandable ring is provided with vertical slits. The tapered portion is connected to the upper connecting piece, and the cylindrical portion is connected to the lower connecting piece.

[0010] The tapered portion is used to connect the expandable ring and the upper connecting piece, and the cylindrical portion is used to connect the lower connecting piece and the expandable ring.

[0011] A further technical solution of the present invention is that a sealing ring is sleeved outside the connection between the tapered portion and the upper connecting piece.

[0012] The sealing ring is made of rubber material. In addition to increasing the friction between the locking structure and the inner wall of the grouting hole during installation, it can also play a sealing role during the grouting process.

[0013] A further technical solution of the present invention is that the slits divide the expandable ring into four equal parts.

[0014] A further technical solution of the present invention is that the expandable ring is made of thin iron sheet, and a buffer layer is provided outside the expandable ring. The buffer layer is a rubber sheet.

[0015] The thin iron sheet can deform in the vertical direction and cannot deform in the horizontal direction and has a certain hardness to ensure the locking effect, and the thin iron sheet material is easily available.

[0016] A further technical solution of the present invention is that a force-bearing portion is provided outside the grouting pipe. The force-bearing portion is used to provide a force point for clamping safety when using a wrench to turn the grouting pipe.

[0017] A further technical solution of the present invention is that the force-bearing part is a concave groove for bearing force when rotating the grouting pipe.

[0018] A further technical solution of the present invention is that there is a force-bearing part above the upper connecting piece, and there are two force-bearing parts between the upper connecting piece and the lower connecting piece. In addition to bearing force, the force-bearing part also plays a certain limiting role to prevent the upper connecting piece and the lower connecting piece from moving beyond the movable range.

[0019] A further technical solution of the present invention is that the input end of the grouting pipe is connected to the grouting machine, and the grouting pipe is a steel pipe or an iron pipe.

[0020] The present invention also provides a method for locking and grouting in a hole. The method is based on the device and includes the following steps:

[0021] Step 1: Drill a hole at a predetermined position to form a grouting hole;

[0022] Step 2: Install the locking structure in the contracted state into the grouting hole;

[0023] Step 3: Rotate the lower end of the grouting pipe through the upper connecting piece and the lower connecting piece in sequence, and continue to rotate the grouting pipe to push it forward. The pitch of the thread connection between the grouting pipe and the upper connecting piece is smaller than the pitch of the thread connection between the grouting pipe and the lower connecting piece. When the grouting pipe is rotated downward, the deformable locking piece expands and expands outward, closely fitting with the grouting hole wall;

[0024] Step 4: Connect the top of the grouting pipe to the grouting equipment and perform grouting operations.

[0025] A further technical solution of the present invention is that in Step 1, a drill bit with a diameter slightly larger than the locking structure is used to drill a hole at a predetermined position, and the hole is cleaned to remove debris in the hole.

[0026] A further technical solution of the present invention is that when the locking structure is in the non-working state, the rubber sealing ring is installed on the conical section outside the expandable ring and pushed up to the position below the upper connecting piece.

[0027] A further technical solution of the present invention is that the locking structure in the non-working state is installed into the grouting hole by means of hammering to ensure firm installation.

[0028] A further technical solution of the present invention is that a wrench is used to rotate and push the grouting pipe at the force-bearing part. During this spiral installation process, as the grouting pipe advances spirally, the expandable ring expands and expands outward, closely fitting with the hole wall.

[0029] The locking structure shrinks into a straight line in the non-working state and expands outward in the working state.

[0030] Advantages of the present invention: The present invention is reasonably designed and has a compact structure. The thread directions on the grouting pipe are the same. When rotating the grouting pipe, since the pitch of the threaded connection between the grouting pipe and the upper connector is smaller than the pitch of the threaded connection between the grouting pipe and the lower connector, the upper connector and the lower connector move in the same direction. However, due to the different pitches, when rotating the grouting pipe, the movement distance of the lower connector is greater than that of the upper connector. By changing the rotation direction of the grouting pipe, the expansion or contraction of the deformation locking member is realized. When the deformation locking member is in the contraction state, it is convenient to be installed into the grouting hole. After entering the grouting hole, continue to rotate the grouting pipe to make the upper connector and the lower connector move upward, so as to realize the expansion and outward expansion of the deformation locking member, which is closely attached to the inner wall of the grouting hole to complete the locking. The position of the grouting pipe is fixed, solving the problem that the internal pressure is too high in high-pressure grouting and over-grouting, resulting in the slip and fall of the grouting conduit and affecting the grouting effect, and ensuring the grouting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. is a schematic structural diagram of a hole-internal locking grouting device provided by the present invention;

[0032] Figure 2 FIG. is a sectional view when the locking structure is connected to the sealing ring provided by the present invention;

[0033] Figure 3 FIG. is a schematic structural diagram of the grouting pipe provided by the present invention;

[0034] Figure 4 FIG. is a schematic structural diagram of the locking structure provided by the present invention;

[0035] Figure 5 FIG. is a schematic structural diagram of the sealing ring provided by the present invention.

[0036] Reference numerals: 1. Grouting pipe, 2. Locking structure, 3. Force-receiving part, 21. Upper connector, 22. Lower connector, 23. Deformation locking member, 231. Conical part, 232. Expandable ring, 233. Cylindrical part, 234. Split seam, 235. Sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following specifically illustrates the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0038] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that the present invention can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0039] Embodiment 1:

[0040] Figures 1-5 A hole-internal locking grouting device is shown. The device includes a grouting pipe 1 and a locking structure 2 sleeved outside the grouting pipe 1.

[0041] The locking structure 2 includes an upper connecting member 21, a lower connecting member 22, and a deformable locking member 23. The upper connecting member 21 is connected to the top of the deformable locking member 23, and the lower connecting member 22 is connected to the bottom of the deformable locking member 23. The grouting pipe 1 is a hollow pipe that is open at both the top and bottom and has an external thread on its surface. Both the upper connecting member 21 and the lower connecting member 22 are threadedly connected to the grouting pipe 1. The pitch of the threaded connection between the grouting pipe 1 and the upper connecting member 21 is smaller than the pitch of the threaded connection between the grouting pipe 1 and the lower connecting member 22. When the grouting pipe 1 is rotated, the deformable locking member 23 expands or contracts.

[0042] As a preferred embodiment, both the upper connecting member and the lower connecting member are nuts, and the inner wall is provided with an internal thread that cooperates with the grouting pipe. The upper connecting member, the deformable locking member, and the lower connecting member are formed by one-time welding processing.

[0043] In this embodiment, the deformable locking member 23 includes a tapered portion 231, an expandable ring 232, and a cylindrical portion 233 that are connected in sequence. The expandable ring 232 is provided with a vertical split seam 234. The tapered portion 231 is connected to the upper connecting member 21, and the cylindrical portion 233 is connected to the lower connecting member 22.

[0044] The tapered portion is used to connect the expandable ring and the upper connecting member, and the cylindrical portion is used to connect the lower connecting member and the expandable ring.

[0045] In this embodiment, a sealing ring 235 is sleeved outside the connection between the tapered portion 231 and the upper connecting member 21.

[0046] In this embodiment, the sealing ring is made of rubber material. Besides increasing the friction between the locking structure and the inner wall of the grouting hole during installation, it can also play a sealing role during the grouting process.

[0047] In this embodiment, the dividing seam 234 divides the expandable ring 232 into four equal parts.

[0048] In this embodiment, the expandable ring 232 is made of thin iron sheet, and a buffer layer is provided outside the expandable ring 232. The buffer layer is a rubber sheet.

[0049] The thin iron sheet can deform in the vertical direction and cannot deform in the horizontal direction and has a certain hardness, which can ensure the locking effect, and the thin iron sheet material is easily available.

[0050] In this embodiment, a force-bearing part 3 is provided outside the grouting pipe 1. The force-bearing part is used for clamping safety when using a wrench to turn the grouting pipe and provides a force-bearing point.

[0051] In this embodiment, the force-bearing part 3 is a concave groove, which is used for bearing force when turning the grouting pipe 1.

[0052] In this embodiment, a force-bearing part 3 is provided above the upper connecting piece 21, and two force-bearing parts 3 are provided between the upper connecting piece 21 and the lower connecting piece 22. Besides playing a force-bearing role, the force-bearing part also plays a certain limiting role to prevent the upper connecting piece and the lower connecting piece from moving beyond the movable range.

[0053] In this embodiment, the input end of the grouting pipe 1 is connected to the grouting machine, and the grouting pipe 1 is a steel pipe or an iron pipe.

[0054] The working principle of the device of the present invention: The thread directions on the grouting pipe are the same. When rotating the grouting pipe, since the pitch of the threaded connection between the grouting pipe 1 and the upper connecting piece 21 is smaller than the pitch of the threaded connection between the grouting pipe 1 and the lower connecting piece 22, the upper connecting piece and the lower connecting piece move in the same direction. However, due to the different pitches, when turning the grouting pipe, the moving distance of the lower connecting piece is greater than that of the upper connecting piece. By changing the turning direction of the grouting pipe, the expansion or contraction of the deformation locking piece is realized. When the deformation locking piece is under the contraction effect, it is convenient to be installed into the grouting hole. After entering the grouting hole, continue to turn the grouting pipe so that the upper connecting piece and the lower connecting piece move upward, thereby realizing the expansion and outward expansion of the deformation locking piece, tightly fitting with the inner wall of the grouting hole, completing the locking, and fixing the position of the grouting pipe to ensure the grouting effect.

[0055] Embodiment Two:

[0056] A method for locking grouting in a hole. The method is based on the device described in Embodiment One and includes the following steps:

[0057] Step 1: Drill a hole at a predetermined position to form a grouting hole;

[0058] Step 2: Install the locking structure 2 in the contracted state into the grouting hole;

[0059] Step 3: Rotate the lower end of the grouting pipe 1 successively through the upper connector 21 and the lower connector 22, and continue to rotate the grouting pipe 1 to push it forward. The pitch of the threaded connection between the grouting pipe 1 and the upper connector 21 is smaller than the pitch of the threaded connection between the grouting pipe 1 and the lower connector 22. When the grouting pipe 1 is rotated downward, the deformable locking member 23 expands and expands outward, tightly fitting with the wall of the grouting hole;

[0060] Step 4: Connect the top of the grouting pipe to the grouting equipment and perform grouting operations.

[0061] In this embodiment, in Step 1, a drill bit with a diameter slightly larger than the locking structure is used to drill a hole at a predetermined position, and the hole passage is cleaned to remove debris in the hole passage.

[0062] In this embodiment, when the locking structure is in the non-working state, the rubber sealing ring is installed on the conical section outside the expandable ring, and is pushed up to the position below the upper connector.

[0063] In this embodiment, the locking structure in the non-working state is installed into the grouting hole by means of hammering, and the installation is firm.

[0064] In this embodiment, the grouting pipe is rotated and advanced by using a wrench at the stress part. During this spiral installation process, as the grouting pipe advances spirally, the expandable ring expands and expands outward, tightly fitting with the hole wall.

[0065] The locking structure is shrunk into a straight line in the non-working state and expands outward in the working state.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An in-hole locking grouting device, characterized in that: The device comprises a grouting pipe (1) and a locking structure (2) sleeved outside the grouting pipe (1), wherein the locking structure (2) is installed in the grouting hole; The locking structure (2) comprises an upper connecting piece (21), a lower connecting piece (22) and a deformable locking piece (23); the upper connecting piece (21) is connected to the top of the deformable locking piece (23); the lower connecting piece (22) is connected to the bottom of the deformable locking piece (23); the grouting pipe (1) is a hollow pipe open at the top and bottom and provided with external threads on the surface; the upper connecting piece (21) and the lower connecting piece (22) are both threadedly connected to the grouting pipe (1); the pitch of the threaded connection between the grouting pipe (1) and the upper connecting piece (21) is smaller than the pitch of the threaded connection between the grouting pipe (1) and the lower connecting piece (22); when the grouting pipe (1) is rotated, the upper connecting piece (21) and the lower connecting piece (22) move in the same direction, and the deformable locking piece (23) expands or contracts.

2. The in-hole locking grouting device according to claim 1, characterized in that: The deformable locking member (23) comprises a conical portion (231), an expandable ring (232) and a cylindrical portion (233) which are connected in sequence, the expandable ring (232) being provided with a vertical dividing seam (234), the conical portion (231) being connected to the upper connecting member (21), and the cylindrical portion (233) being connected to the lower connecting member (22).

3. The in-hole locking grouting device according to claim 2, characterized in that: A sealing ring (235) is sleeved on the outer side of the connection between the conical portion (231) and the upper connecting piece (21).

4. The in-hole locking grouting device according to claim 2, characterized in that: The dividing seam (234) divides the expandable ring (232) into four equal parts.

5. The in-hole locking grouting device according to claim 2, characterized in that: The expandable ring (232) is made of thin iron sheet, and a buffer layer is provided outside the expandable ring (232).

6. An in-hole locking grouting device according to any one of claims 1 to 5, characterized in that: A force-bearing portion (3) is provided on the outer side of the grouting pipe (1).

7. The in-hole locking grouting device according to claim 6, characterized in that: The force-bearing portion (3) is a concave groove, and is used to bear force when the grouting pipe (1) is rotated.

8. The in-hole locking grouting device according to claim 6, characterized in that: A force-bearing portion (3) is provided above the upper connecting member (21), and two force-bearing portions (3) are provided between the upper connecting member (21) and the lower connecting member (22).

9. An in-hole locking grouting device according to any one of claims 1 to 5, characterized in that: The input end of the grouting pipe (1) is connected to a grouting machine, and the grouting pipe (1) is a steel pipe or an iron pipe.

10. A method for locking grouting in a hole, characterized in that: The method is based on the device according to any one of claims 1 to 9, comprising the following steps: Step 1: Drilling holes at predetermined locations to form grouting holes; Step 2: Install the locking structure (2) in the contracted state into the grouting hole; Step 3: Rotate the lower end of the grouting pipe (1) through the upper connecting piece (21) and the lower connecting piece (22) in sequence, and continue to rotate the grouting pipe (1) to advance. When the grouting pipe (1) is rotated downward, the deformable locking piece (23) expands outward until it fits tightly against the grouting hole wall. Step 4: Connect the top of the grouting pipe to the grouting equipment and perform grouting operations.

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