Grouting pipe suitable for directional splitting grouting in soft soil stratum

Abstract

The utility model discloses a grouting pipe suitable for directional splitting grouting in a soft soil layer, which belongs to the technical field of grouting devices and comprises a grouting pipe body used for being placed in a drill hole and grouting into the soil layer. The multiple expansion assemblies are sequentially arranged in the height direction of the grouting pipe body, each expansion assembly comprises a plurality of shear-fork-shaped blades arranged on the periphery of the grouting pipe body in a winding mode, and the shear-fork-shaped blades stretch out and draw back in the radial direction of the grouting pipe body; and the driving mechanism is arranged at the top of the side wall of the grouting pipe body, the driving mechanism is connected with the multiple shear-fork-shaped blades, and the driving mechanism is used for adjusting the shear-fork angles of the multiple shear-fork-shaped blades, so that the shear-fork-shaped blades expand outwards or retract. According to the utility model, directional splitting cracks can be provided for slurry diffusion, slurry is induced to diffuse along the cracks and is filled, the diffusion direction and range of the slurry are convenient to control, the slurry is relatively uniformly diffused in a soft soil stratum, and a mutually lapped slurry vein skeleton network is formed.

Description

Technical Field

[0001] This utility model relates to the field of grouting device technology, and in particular to a grouting pipe suitable for directional splitting grouting in soft soil strata. Background Technology

[0002] Fracturing grouting is a foundation reinforcement technique that uses high-pressure grouting to inject cement or chemical grout into soil layers to improve soil properties. The grout injected into the soil forms a network or framework to reinforce the soil, improving soil properties while effectively filling internal soil defects and increasing the bearing capacity of the foundation.

[0003] The morphology, distribution, and characteristics of grout veins significantly impact the effectiveness of fracturing grouting. However, in actual fracturing grouting processes, the grout primarily diffuses along weak surfaces or cracks in soft soil layers. This can lead to some areas not being fully filled with grout, forming irregular grout veins and hindering the formation of an ideal reinforcement network. This results in inconsistent grouting effectiveness and poor economic efficiency. Ensuring crack formation requires high grouting pressure, which significantly disturbs the soil, potentially altering its structure and even causing localized deformation.

[0004] Therefore, a grouting pipe suitable for directional splitting grouting in soft soil strata is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a grouting pipe suitable for directional splitting grouting in soft soil strata, aiming to solve or improve at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a grouting pipe suitable for directional splitting grouting in soft soil strata, comprising:

[0007] Grouting pipe body, which is used to be inserted into the borehole and to inject grout into the soil layer;

[0008] Multiple sets of expansion components are arranged sequentially along the height direction of the grouting pipe body. Each expansion component includes multiple scissor-shaped blades arranged around the grouting pipe body. The scissor-shaped blades extend and retract radially along the grouting pipe body.

[0009] A driving mechanism is disposed on the top of the side wall of the grouting pipe body. The driving mechanism is connected to a plurality of scissor blades. The driving mechanism is used to adjust the scissor angle of the plurality of scissor blades, thereby causing the scissor blades to expand outward or retract.

[0010] Preferably, the grouting pipe body is externally slidably fitted with multiple movable sleeves, and the multiple movable sleeves are arranged one-to-one with multiple sets of expansion components. Among the two scissor rods of the scissor-shaped blade near the grouting pipe body, one scissor rod is rotatably connected to the side wall of the grouting pipe body, and the other scissor rod is rotatably connected to the side wall of the movable sleeve. The driving mechanism is connected to the movable sleeve for driving the movable sleeve to slide up and down along the grouting pipe body.

[0011] Preferably, the side wall of the grouting pipe body is fixed with multiple axial protrusions, and the inner side wall of the movable sleeve is provided with multiple axial grooves, and the axial protrusions are slidably connected to the axial grooves.

[0012] Preferably, the driving mechanism includes a chuck sleeved on the outer wall of the grouting pipe body and a limiting sleeve sleeved on the outer wall of the grouting pipe body. A plurality of scissor-shaped blades are located between the chuck and the limiting sleeve. A plurality of threaded rods are rotatably connected between the chuck and the limiting sleeve. The threaded rods pass through the movable sleeve and are threadedly connected to the movable sleeve. The limiting sleeve is provided with a driving assembly that is drivenly connected to the plurality of threaded rods.

[0013] Preferably, the driving assembly includes a first gear sleeved on the body of the grouting pipe, the first gear being rotatably connected to the limiting sleeve, the first gear being located between the plurality of threaded rods, and a second gear being fixedly sleeved on the outside of the threaded rods, the second gear meshing with the first gear.

[0014] Preferably, the top of the first gear is provided with multiple rotating handles.

[0015] Preferably, the bottom of the grouting pipe body is threaded with a tapered grouting head.

[0016] This utility model discloses the following technical effects: Before construction, the scissor-shaped blades are retracted onto the side wall of the grouting pipe. During construction, the grouting pipe is placed into the borehole, and the scissor angle of the blades is adjusted by the drive mechanism, thereby causing several scissor-shaped blades to extend radially along the grouting pipe. The scissor-shaped blades directionally chisel out splitting cracks, and then splitting grouting is achieved through the grouting pipe. This application can provide directional splitting cracks for grout diffusion, induce grout to diffuse and fill along the cracks, facilitate control of the grout diffusion direction and range, and enable the grout to diffuse more uniformly in soft soil strata, forming an overlapping grout vein skeleton network. Moreover, compared with the traditional splitting grouting method, the pre-induction of crack generation can reduce grouting pressure, reduce disturbance to the soil layer, and thus reduce the risk of local deformation. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a front view of the expansion component of this utility model when it is retracted;

[0019] Figure 2 This is a top view of the expansion component of this utility model when it is retracted;

[0020] Figure 3 This is a front view of the expansion component of this utility model when unfolded;

[0021] Figure 4 This is a top view of the expansion component of this utility model when it is unfolded;

[0022] Figure 5 This is a schematic diagram of the structure of the limiting sleeve and the first gear in this utility model.

[0023] In the figure: 1. Grouting pipe body; 2. Expansion assembly; 3. Scissor blade; 4. Drive mechanism; 5. Movable sleeve; 6. Axial protrusion; 7. Chuck; 8. Limiting sleeve; 9. Threaded rod; 10. First gear; 11. Circumferential protrusion; 12. Rotary handle; 13. Grouting head; 14. Grouting hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figures 1-5 This utility model provides a grouting pipe suitable for directional splitting grouting in soft soil strata, comprising:

[0027] Grouting pipe body 1, which is used to be inserted into the borehole and grout into the soil layer;

[0028] Multiple sets of expansion components 2 are arranged sequentially along the height direction of the grouting pipe body 1. Each expansion component 2 includes multiple scissor-shaped blades 3 that are arranged around the grouting pipe body 1. The scissor-shaped blades 3 extend and retract radially along the grouting pipe body 1.

[0029] The drive mechanism 4 is located on the top of the side wall of the grouting pipe body 1. The drive mechanism 4 is connected to several scissor blades 3. The drive mechanism 4 is used to adjust the scissor angle of the several scissor blades 3, so that the scissor blades 3 expand outward or retract.

[0030] In this embodiment, the grouting pipe body 1 is a hollow structure used to transport grout. The portion of the grouting pipe body 1 inserted into the borehole has grouting holes 14 arranged in a quincunx pattern, allowing the grout to spread more evenly and fill more densely in the soil layer. Both ends of the grouting pipe body 1 are threaded; the bottom thread is used to connect to the grouting head 13, and the top thread is used to connect to the grout stop valve. The dimensions (length, diameter, etc.) of the grouting pipe body 1 should be determined by the drilling parameters and other components to ensure that it can be easily disassembled and inserted into the borehole to the designated position after assembly. The entire grouting pipe body 1 should be made of stainless steel, alloy, or other materials to provide good corrosion resistance and high strength, enabling it to remain effective for a long time in complex environments such as acidic and alkaline conditions.

[0031] In some optional embodiments, a plurality of movable sleeves 5 are slidably sleeved on the outside of the grouting pipe body 1. The plurality of movable sleeves 5 are arranged in a one-to-one correspondence with a plurality of expansion components 2. Among the two scissor blades of the scissor blade 3 near the grouting pipe body 1, one scissor blade is rotatably connected to the side wall of the grouting pipe body 1, and the other scissor blade is rotatably connected to the side wall of the movable sleeve 5. The driving mechanism 4 is connected to the movable sleeve 5 for driving the movable sleeve 5 to slide up and down along the grouting pipe body 1.

[0032] In this embodiment, the scissor blade 3 consists of two scissor rods and two connecting rods. The middle of the two scissor rods is rotatably connected. One end of the two scissor rods is rotatably connected to the side wall of the grouting pipe body 1 and the side wall of the movable sleeve 5, respectively. The other end is rotatably connected to the two connecting rods, and the ends of the two connecting rods are rotatably connected.

[0033] In use, the extension length of the scissor blade 3 can be controlled by adjusting the position of the movable sleeve 5. The angle and number of cracks in the soil can also be controlled by removing a certain scissor blade 3, thereby controlling the range and direction of grout diffusion according to reinforcement needs.

[0034] In some alternative embodiments, the side wall of the grouting pipe body 1 is fixed with multiple axial protrusions 6, and the inner side wall of the movable sleeve 5 is provided with multiple axial grooves, and the axial protrusions 6 are slidably connected to the axial grooves.

[0035] The rotation of the movable sleeve 5 is restricted by setting the axial protrusion 6.

[0036] In some optional embodiments, the drive mechanism 4 includes a chuck 7 sleeved on the outer wall of the grouting pipe body 1 and a limiting sleeve 8 sleeved on the outer wall of the grouting pipe body 1. A plurality of scissor blades 3 are located between the chuck 7 and the limiting sleeve 8. A plurality of threaded rods 9 are rotatably connected between the chuck 7 and the limiting sleeve 8. The threaded rods 9 pass through the movable sleeve 5 and are threadedly connected to the movable sleeve 5. The limiting sleeve 8 is provided with a drive assembly that is driven by the plurality of threaded rods 9.

[0037] In some alternative embodiments, the drive assembly includes a first gear 10 sleeved on the outside of the grouting pipe body 1, the first gear 10 being rotatably connected to the limiting sleeve 8, the first gear 10 being located between a plurality of threaded rods 9, and a second gear being fixedly sleeved on the outside of the threaded rods 9, the second gear meshing with the first gear 10.

[0038] In some alternative embodiments, the threaded rod 9 passes through the limiting sleeve 8, multiple movable sleeves 5, and chuck 7 in sequence. Nuts are screwed onto both ends of the threaded rod 9. Circumferential protrusions 11 are fixed to both ends of the side wall of the grouting pipe body 1. The limiting sleeve 8 is clamped between the upper nut and the circumferential protrusion 11, and the chuck 7 is clamped between the lower nut and the circumferential protrusion 11.

[0039] In this embodiment, three threaded rods 9 are provided, which pass through the limiting sleeve 8, the two movable sleeves 5 and the chuck 7 from top to bottom, and are tightened with nuts at both ends. The circumferential protrusion 11 below the limiting sleeve 8 can support its bottom and restrict its downward sliding. The nut above the limiting sleeve 8 restricts its upward sliding. The nut below the chuck 7 restricts its downward sliding, and the circumferential protrusion 11 above restricts its upward sliding. The threaded rods 9 are rotatably connected to the openings of the limiting sleeve 8 and the chuck 7. The openings on the movable sleeves 5 are threaded holes, and the threaded rods 9 are threadedly connected to the movable sleeves 5.

[0040] The expansion component 2 is provided in two sets, namely, two layers of scissor blades 3, with 6 sets of scissor blades 3 on each layer. There are two movable sleeves 5, which are adjacent to each other. The external thread of the threaded rod 9 is divided into upper and lower parts, and the two parts of the external thread have opposite directions of rotation. The two movable sleeves 5 are respectively threaded to the two parts of the external thread. Therefore, when the threaded rod 9 rotates, the two movable sleeves 5 can move closer or further away at the same time.

[0041] The first gear 10 has a shaft hole in the middle, through which the grouting pipe body 1 passes. The size of the shaft hole is not less than the outer wall size of the grouting pipe body 1. When in use, the first gear 10 is rotated. Since the first gear 10 meshes with the second gear outside the threaded rod 9, the threaded rod 9 is driven to rotate. Therefore, the threaded rod 9 and the movable sleeve 5 rotate in a threaded manner, so that the movable sleeve 5 moves up and down along the axial direction of the grouting pipe body 1, thereby realizing the extension of the scissor blade 3.

[0042] In some alternative embodiments, the top of the first gear 10 is provided with a plurality of rotating handles 12. The rotating handles 12 can rotate on the first gear 10, thereby rotating to be perpendicular to the grouting pipe body 1 for easy gripping and operation, or rotating to be parallel to the grouting pipe body 1 for easy storage and transportation.

[0043] The limiting sleeve 8 and the rotating handle 12 are provided with a clearance hole. The rotating handle 12 passes through the clearance hole and is exposed outside the limiting sleeve 8, which facilitates operation. When the rotating handle 12 is held and drives the first gear 10 to rotate, the rotating handle 12 can move within the clearance hole.

[0044] In some alternative embodiments, a tapered grouting head 13 is threadedly connected to the bottom of the grouting pipe body 1.

[0045] The grouting head 13 is threadedly connected to the grouting pipe body 1, facilitating the installation of the threaded rod and allowing for the replacement of grouting heads 13 of different sizes as needed for borehole enlargement. In the event of partial borehole collapse, the grouting head 13 can enlarge the borehole to ensure the grouting pipe can smoothly reach the designated position. The size of the grouting head 13 should be slightly larger than the outer diameter of the assembled rod to avoid blockage during insertion into the borehole.

[0046] How to use this utility model:

[0047] (1) Customized grouting pipe body 1: The grouting pipe body 1 is processed according to the structural design. The specific dimensions and specifications should be determined according to the actual grouting conditions.

[0048] (2) Drilling and cleaning grouting holes: Arrange grouting hole positions according to the site conditions, and chisel out a limiting groove on the inside of the structure that matches the end of the grouting pipe body 1. After drilling to the design depth according to the design parameters of grouting hole 1, clean the debris in the drill hole to ensure that the grouting pipe body 1 can be smoothly inserted into the set position.

[0049] (3) Install the grouting pipe body 1: After inserting the grouting pipe body 1 into the soil along the grouting hole, rotate the rotating handle 12 to extend the scissor blade 3 to the set length, remove the transmission device (i.e. remove the limiting sleeve 8 and the associated first gear 10 and other structures), install the grout stop valve at the end of the grouting pipe body 1, and then seal the gap between the grouting pipe and the top of the borehole with quick-setting cement.

[0050] (4) Grouting: Connect the grouting pipe and grout according to the grouting requirements;

[0051] (5) Remove the grouting pipe and seal the hole: When the grout has initially set and no longer flows out, remove the grout stop valve, cut off the exposed part of the rod and the threaded rod, and seal the grouting hole as required.

[0052] For the methods described above, where specific conditions are not specified in this application, the methods shall be carried out in accordance with standard conditions or conditions recommended by on-site technical personnel.

[0053] The technical effects are mainly reflected in the following aspects:

[0054] (1) By adjusting the number of sets and extension length of the scissor blades 3, directional splitting fissures can be provided for grout diffusion, inducing grout to diffuse along the fissures and fill them; thereby controlling the direction and range of grout diffusion as needed, so that the grout can diffuse evenly in the soft soil layer and form an overlapping grout vein skeleton network; at the same time, the grouting pipe itself can also bear a certain pressure, working together with the grout vein skeleton to achieve the ideal reinforcement effect.

[0055] (2) Compared with the traditional split grouting method, induced directional split grouting causes less disturbance to the surrounding soil. By reasonably controlling the grouting pressure and the grout diffusion range, the impact on the surrounding environment during construction can be effectively avoided and the soil deformation can be controlled.

[0056] (3) Compared with some complex reinforcement methods, this grouting pipe, through optimized grouting pipe structure and construction process, reduces project costs while ensuring reinforcement effect. Furthermore, the invention is compact, lightweight, and easy to operate, enabling rapid construction even in narrow spaces or complex terrain. It can be widely applied in practical production activities involving splitting grouting reinforcement of soft soil strata such as tunnels, foundation pits, and earth dams.

[0057] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0058] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A grouting pipe suitable for directional splitting grouting in soft soil layer, characterized in that, The utility model relates to a slurry injection pipe body (1) for putting into the borehole and injecting slurry into the soil layer, a plurality of sets of expansion assemblies (2) arranged in sequence along the height direction of the slurry injection pipe body (1), the expansion assembly (2) comprising a plurality of scissor type blades (3) arranged around the slurry injection pipe body (1), the scissor type blades (3) being radially telescopic along the slurry injection pipe body (1), a driving mechanism (4) arranged at the top of the side wall of the slurry injection pipe body (1), the driving mechanism (4) being connected with the plurality of scissor type blades (3), the driving mechanism (4) being used for adjusting the scissor angle of the plurality of scissor type blades (3) so as to make the scissor type blades (3) expand outward or retract. The slurry injection pipe body (1) is slidably sleeved with a plurality of movable sleeves (5), the plurality of movable sleeves (5) being arranged in one-to-one correspondence with the plurality of sets of expansion assemblies (2), the scissor type blades (3) being close to two scissor rods of the slurry injection pipe body (1), one of the two scissor rods being rotationally connected with the side wall of the slurry injection pipe body (1), the other scissor rod being rotationally connected with the side wall of the movable sleeve (5), the driving mechanism (4) being connected with the movable sleeve (5) for driving the movable sleeve (5) to slide up and down along the slurry injection pipe body (1). The side wall of the slurry injection pipe body (1) is fixedly connected with a plurality of axial protrusions (6), the inner side wall of the movable sleeve (5) being provided with a plurality of axial grooves, the axial protrusions (6) being slidably connected with the axial grooves. The driving mechanism (4) comprises a chuck (7) sleeved on the outer wall of the slurry injection pipe body (1) and a limiting sleeve (8) sleeved on the outer wall of the slurry injection pipe body (1), the plurality of scissor type blades (3) being located between the chuck (7) and the limiting sleeve (8), a plurality of threaded rods (9) being rotationally connected between the chuck (7) and the limiting sleeve (8), the threaded rods (9) penetrating through the movable sleeve (5) and being threadedly connected with the movable sleeve (5), the limiting sleeve (8) being provided with a driving assembly in transmission connection with the plurality of threaded rods (9).

2. The grouting pipe suitable for directional splitting grouting in soft soil layer according to claim 1, characterized in that: The driving assembly comprises a first gear (10) sleeved on the outside of the slurry injection pipe body (1), the first gear (10) being rotationally connected with the limiting sleeve (8), the first gear (10) being located between the plurality of threaded rods (9), a second gear being fixedly sleeved on the outside of the threaded rods (9) and being in mesh with the first gear (10).

3. The grouting pipe suitable for directional splitting grouting in soft soil layer according to claim 2, characterized in that: A plurality of rotating handles (12) are arranged at the top of the first gear (10).

4. The grouting pipe suitable for directional splitting grouting in soft soil layer according to claim 2, characterized in that: A conical slurry injection head (13) is threadedly connected to the bottom of the slurry injection pipe body (1).

5. The grouting pipe suitable for directional splitting grouting in soft soil layer according to claim 4, characterized in that: ​ 6. The grouting pipe suitable for directional splitting grouting in soft soil layer according to claim 5, characterized in that: ​ 7. The pipe for directional fracturing grouting in soft soil layer according to claim 1, characterized in that: ​

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