Soft soil foundation grouting pipe inserting and pulling and supporting device

Abstract

The utility model provides a kind of soft soil foundation grouting pipe plug and support device, including the steel sheet pile body inserted in soft soil foundation, grouting pipe and pipe plug and support mechanism, pipe plug and support mechanism includes the support frame of being installable in the top of steel sheet pile body, and support frame is provided with guide frame, and the top of guide frame is provided with pipe plug mechanism, and bottom is provided with deviation rectification mechanism. By being provided with support frame on the top of steel sheet pile body, and being sequentially configured guide frame, pipe plug mechanism and bottom deviation rectification mechanism on support frame, grouting pipe can be always subjected to multi-point constraint and guide in the process of plugging, effectively avoid the deviation and sway of pipe due to the insufficient bearing capacity of soft soil;Guide frame guarantees the vertical accuracy of pipe plug, and plug mechanism realizes the quick insertion and extraction of pipe, and deviation rectification mechanism can be adjusted in real time when pipe deviates, so as to greatly improve the accuracy of grouting orifice positioning and the stability of construction.

Description

Technical Field

[0001] This utility model relates to the field of sheet pile support for soft soil foundations, and in particular to a grouting conduit insertion and support device for soft soil foundations. Background Technology

[0002] In soft soil foundation engineering, traditional grouting reinforcement construction often faces significant challenges due to the soil's high compressibility, low permeability, and low shear strength. Existing grouting processes typically involve manually or mechanically inserting guide pipes. However, in soft soil conditions, these pipes are prone to displacement, tilting, or even bending, with deviations often reaching several centimeters to tens of centimeters. This not only leads to discrepancies between the grouting area and the design but can also cause concentrated grout leakage, affecting the uniformity and overall effectiveness of the reinforcement. Furthermore, the lack of reliable guidance and support during insertion and extraction makes the guide pipes susceptible to swaying due to the fluidity of the soft soil and disturbances from excavation, making it difficult to maintain the stability of the grouting hole position and further reducing construction accuracy. Although some projects have attempted to improve this by increasing the rigidity of the guide pipes or adding temporary fixing components, these methods are complex, inefficient, and difficult to dynamically adjust. Therefore, this paper proposes a guide pipe insertion, extraction, and support device for soft soil foundation grouting to solve the above problems. Utility Model Content

[0003] The main purpose of this utility model is to provide a device for inserting and supporting grouting conduits in soft soil foundations, which solves the problem that the conduits are prone to displacement, tilting or even bending during the insertion process.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a grouting pipe insertion and support device for soft soil foundation, including a steel sheet pile body inserted into the soft soil foundation, a grouting pipe and a pipe insertion and support mechanism. The pipe insertion and support mechanism includes a support frame that can be installed on the top of the steel sheet pile body, a guide frame is provided on the support frame, a pipe insertion and support mechanism is provided at the top of the guide frame, and a correction mechanism is provided at the bottom. A hole is provided at the center of the guide frame for the grouting pipe to pass through; The conduit insertion and removal mechanism includes uprights at the four corners of the top of the guide frame, a top plate at the top of the uprights, a hole at the center of the top plate for the grouting conduit to pass through, a multi-jaw chuck for clamping the grouting conduit is movably installed between the top plate and the guide frame, a sliding sleeve that slides on the uprights is installed on the outside of the multi-jaw chuck, and two symmetrical telescopic cylinders are installed on the top plate. The telescopic ends of the telescopic cylinders pass through the top plate and are connected to the multi-jaw chuck for controlling its lifting and lowering.

[0005] In the preferred embodiment, the support frame includes a horizontal frame. One end of the horizontal frame is provided with a hook that can be hooked onto the web of the main body of the sheet pile. The bottom of the hook is provided with a V-shaped reinforcing frame that connects to the bottom of the horizontal frame. The inner side of the web of the main body of the sheet pile is provided with an insertion groove that can cooperate with the hook. The bottom of the insertion groove is provided with a through hole. The end of the hook is provided with a fixing screw with a through hole and a nut threaded on it. The guide frame is located at the end of the horizontal frame furthest from the hook.

[0006] In the preferred embodiment, corresponding elongated holes are provided on the two flanges of the main body of the steel sheet pile and on both sides of the horizontal frame, and a tie rod locked by a nut is provided between the two corresponding elongated holes of the flanges and the horizontal frame.

[0007] In the preferred embodiment, the jaws of the multi-jaw chuck are provided with a rectangular array of telescopic springs at their ends, and the other end of the telescopic springs is connected to a clamping seat for fitting with the grouting conduit.

[0008] In the preferred embodiment, the correction mechanism includes multiple lifting frames located at the bottom of the guide frame. A fixed ring is located at the bottom of each lifting frame, a rotating ring is rotatably mounted inside the fixed ring, a driven bevel gear is located at the top of the rotating ring, an extension platform is located outside the fixed ring, a drive device is located at the top of the extension platform, and a transmission bevel gear that meshes with the driven bevel gear is mounted on the output shaft of the drive device. A mounting base is located at the bottom of the rotating ring, and a laser rangefinder and a correction telescopic cylinder are mounted on the mounting base, both positioned on the same vertical line. The laser rangefinder is two in number.

[0009] In the preferred embodiment, a convex-concave mating structure is provided between the rotating ring and the fixed ring.

[0010] In the preferred embodiment, slide rails are symmetrically arranged on both sides of the horizontal frame, and slide grooves that slide with the slide rails are arranged on both sides of the guide frame. A push-pull telescopic cylinder is installed on the horizontal frame, and the telescopic end of the push-pull telescopic cylinder is connected to the guide frame.

[0011] This invention provides a grouting guide pipe insertion and extraction and support device for soft soil foundations. By setting a support frame on the top of the sheet pile body, and sequentially arranging a guide frame, a guide pipe insertion and extraction mechanism, and a bottom correction mechanism on the support frame, the grouting guide pipe is always subject to multi-point constraint and guidance during insertion and extraction, effectively avoiding pipe deviation and swaying caused by insufficient bearing capacity of soft soil. The guide frame ensures the vertical accuracy of guide pipe insertion and extraction, the insertion and extraction mechanism enables rapid insertion and extraction of the guide pipe, and the correction mechanism can make real-time adjustments when the guide pipe deviates, thereby significantly improving the accuracy of grouting hole positioning and construction stability. This device not only improves the insertion and extraction efficiency of grouting guide pipes, but also ensures the uniform diffusion range of grout, enhancing the reinforcement effect of soft soil foundations, and achieving high construction accuracy, high efficiency, and stable quality overall. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the connection structure between the grouting conduit and the single-port sealing grouting part of this utility model; Figure 3 This is a structural diagram of the single-port sealing grouting part of this utility model; Figure 4 This is a utility model Figure 3 A half-section structural diagram; Figure 5 This is a structural diagram of the steel sheet pile body, grouting pipe, and pipe insertion / extraction and support mechanism of this utility model. Figure 6 This is a utility model Figure 5 Another perspective on the structure diagram; Figure 7 This is a utility model Figure 6 Another perspective on the structure diagram; Figure 8 This is a structural diagram of the steel sheet pile of this utility model; Figure 9 This is a utility model Figure 5 Top view of the structure; Figure 10 This is a structural diagram of the catheter insertion / removal and support mechanism of this utility model; Figure 11 This is a utility model Figure 10 Another perspective on the structure diagram; Figure 12 This is a structural diagram of the support frame of this utility model; Figure 13 This is an exploded structural diagram of the catheter insertion / removal and support mechanism of this utility model; Figure 14 This is a utility model Figure 13 Enlarged view of the A-structure; Figure 15 This is a partial sectional view of the correction mechanism of this utility model; Figure 16 This is a utility model Figure 14 Another perspective on the structure diagram. In the diagram: Sheet pile body 1; elongated hole 101; insertion groove 102; tie rod 103; grouting guide pipe 2; one-way valve 201; guide pipe insertion / extraction and support mechanism 3; support frame 30; horizontal frame 301; V-shaped reinforcement frame 302; hook 303; fixing screw 304; push-pull telescopic cylinder 305; slide rail 306; guide frame 31; slide groove 311; guide pipe insertion / extraction mechanism 32; upright 320; top plate 321; multi-jaw chuck 322; telescopic spring 3220; clamping seat 3221; sliding sleeve 323; telescopic cylinder 324; correction mechanism 33; hoisting frame 330; and fixed... Fixed ring 331; Rotating ring 332; Driven bevel gear 333; Extension platform 334; Drive device 335; Transmission bevel gear 336; Mounting base 337; Correction telescopic cylinder 338; Laser rangefinder 339; Concave-convex mating structure 3310; Grouting mechanism 4; Variable grouting pump 401; Controller 402; Flow meter 403; Grouting pressure sensor 404; Grouting hose 405; Single-port sealed grouting part 406; Upper plate 4060; Lower plate 4061; Connecting rod 4062; Sealed inflatable airbag 4063; Grouting head 4064; Soft air tube 4065. Detailed Implementation

[0013] Example 1 like Figure 1-16 As shown, a steel sheet pile grouted support structure for soft soil foundation includes a steel sheet pile body 1 inserted into the soft soil foundation. In this embodiment, the steel sheet pile body 1 adopts U-shaped steel sheet piles of 400mm III and IV, with pile lengths of 6 / 9 / 12 / 15m. It also includes multiple grouted ducts 2, a duct insertion and support mechanism 3 corresponding to the number of grouted ducts 2, and a grouting mechanism 4. The duct insertion and support mechanism 3 is used to insert the grouted ducts 2 into the soft soil foundation on the back side of the steel sheet pile body 1 and support it. In this embodiment, the grouted ducts 2 are made of Q345 steel with a diameter of φ100mm. The 5mm seamless steel pipe has a tensile strength ≥400MPa. The guide pipe insertion and support mechanism 3 is arranged on the top of the steel sheet pile body 1. The grouting guide pipe 2 is provided with multiple grouting ports located on its side, and a one-way valve 201 is provided at the grouting port. The multiple grouting ports are arranged vertically and face the opposite side to the steel sheet pile body 1. The one-way valve 201 prevents the grout from flowing back into the pipe. At the same time, in order to avoid affecting the insertion of the grouting guide pipe 2, the outer surface of the one-way valve 201 is flush with the outer surface of the grouting guide pipe 2. The output end of the grouting mechanism 4 is connected to the grouting guide pipe 2 and grout is injected into it.

[0014] With this design, the soft soil foundation behind the sheet pile body 1 can be grouted and solidified at multiple heights by inserting the grouting pipe 2 into the back of the sheet pile body 1, thereby forming a composite structure of sheet pile, grout body and soil, reducing the bending moment of the pile body. At the same time, with the support of the pipe insertion and removal and the support mechanism 3, the grouting pipe 2 can achieve directional diffusion of grout, avoiding blind spots and waste.

[0015] In the preferred embodiment, the grouting mechanism 4 includes a variable grouting pump 401, a controller 402 is provided on the variable grouting pump 401, and a grouting hose 405 connected to the grouting conduit 2 is provided at the output end of the variable grouting pump 401. A flow meter 403 and a grouting pressure sensor 404 are provided on the grouting hose 405.

[0016] It should be noted that the input end of the variable grouting pump 401 is connected to a material tank through a pipeline, so that the grout in the material tank can be injected into the grouting conduit 2 through the variable grouting pump 401, and injected into the soft soil foundation through each grouting port on the grouting conduit 2. During this process, the flow rate and pressure can be detected by the flow meter 403 and the grouting pressure sensor 404, respectively.

[0017] In addition, to achieve sequential grouting from bottom to top at each grouting port in the grouting conduit 2, the outlet end of the grouting hose 405 is provided with a single-port sealed grouting part 406 located in the grouting conduit 2. The single-port sealed grouting part 406 includes an upper plate 4060 and a lower plate 4061. The diameters of the upper plate 4060 and the lower plate 4061 are smaller than the inner diameter of the grouting conduit 2, and can avoid the protrusion of the one-way valve 201 during lifting and lowering. The distance between the upper plate 4060 and the lower plate 4061 can encompass any grouting port. Multiple connecting rods 4062 are arranged in a ring between the upper plate 4060 and the lower plate 4061, and their external surfaces are... Each component is equipped with a sealing airbag 4063. In this embodiment, there are three connecting rods 4062. Through the cooperation of the sealing airbag 4063 with the upper plate 4060 and the lower plate 4061, any grouting port can be covered within it to form an independent grouting environment. At the same time, when the sealing airbag 4063 and the inside of the grouting conduit 2 are tightly fitted together through expansion, it plays a sealing role and can fix the single-port sealing grouting part 406 at this height to ensure grouting stability. Furthermore, when the sealing airbag 4063 deflates and shrinks, it does not affect the passage of the single-port sealing grouting part 406 through the protrusion of the one-way valve 201.

[0018] In addition, a pressure sensor is installed inside the sealed inflatable airbag 4063 to monitor the pressure inside the sealed inflatable airbag 4063, thereby determining the sealing and fixing effect through the pressure value. A grouting head 4064 connected to the grouting hose 405 is installed through the center of the upper plate 4060, so that grout can be injected into the formed sealed grouting space through the grouting head 4064. Both sealed inflatable airbags 4063 are connected to flexible air tubes 4065, which extend along the grouting hose 405 to the outside of the grouting hose 405 and are connected to the airbag inflation and deflation equipment, thereby realizing the inflation and deflation management of the sealed inflatable airbags 4063.

[0019] It should be noted that the airbag inflation / deflation device is a common product sold on the market, so it will not be described in detail here.

[0020] Furthermore, the connecting rod 4062 has an internal cavity for the passage of the flexible air tube 4065, thereby protecting the flexible air tube 4065 and preventing it from directly passing through the enclosed grouting space.

[0021] In the preferred embodiment, the guide pipe insertion and support mechanism 3 includes a support frame 30 that can be installed on the top of the sheet pile body 1. A guide frame 31 is provided on the support frame 30. A guide pipe insertion and extraction mechanism 32 is provided on the top of the guide frame 31, and a correction mechanism 33 is provided on the bottom. The grouting pipe 2 passes through the guide pipe insertion and extraction mechanism 32, the guide frame 31, and the correction mechanism 33 before insertion. The guide pipe insertion and extraction mechanism 32 is used for the insertion and extraction of the grouting pipe 2, and the correction mechanism 33 is used for correction of its deviation during the insertion process.

[0022] Furthermore, the support frame 30 is a welded frame-type steel structure, specifically including a horizontal frame 301. One end of the horizontal frame 301 is provided with a hook 303 that can be hooked onto the web of the sheet pile body 1. In this embodiment, there are two hooks 303, which are symmetrically arranged. The bottom of the hook 303 is provided with a V-shaped reinforcing frame 302 that is connected to the bottom of the horizontal frame 301 to improve the support strength of the horizontal frame 301.

[0023] Meanwhile, the inner side of the web of the sheet pile body 1 is provided with a plug groove 102 that can cooperate with the hook 303. The bottom of the plug groove 102 is provided with a through hole, and the end of the hook 303 is provided with a fixing screw 304 with a through hole and a nut threaded on it.

[0024] With this design, when the hook 303 is hooked onto the sheet pile body 1, its end is inserted into the corresponding insertion slot 102, and the fixing screw 304 passes through the through hole, and is finally fixed by the nut.

[0025] In addition, corresponding elongated holes 101 are provided on the two flanges of the steel sheet pile body 1 and on both sides of the horizontal frame 301. A tie rod 103 locked by a nut is provided between the two corresponding elongated holes 101 of the flange and the horizontal frame 301, thereby further improving the fixing effect from the side.

[0026] Furthermore, the guide frame 31 is located at the end of the horizontal frame 301 away from the hook 303, and a hole for the grouting conduit 2 to pass through is provided at its center.

[0027] Meanwhile, the conduit insertion and removal mechanism 32 includes uprights 320 located at the four corners of the top of the guide frame 31. A top plate 321 is provided on the top of the uprights 320. A hole for the grouting conduit 2 to pass through is provided at the center of the top plate 321. A multi-jaw chuck 322 for clamping the grouting conduit 2 is movably arranged between the top plate 321 and the guide frame 31. In this embodiment, the multi-jaw chuck 322 is a hydraulic three-jaw chuck. A sliding sleeve 323 is provided on the outside of the multi-jaw chuck 322 and is slidably fitted on the uprights 320, so that it can be stably raised and lowered along the vertical direction of the uprights 320. Two symmetrical telescopic cylinders 324 are provided on the top plate 321. The telescopic ends of the telescopic cylinders 324 pass through the top plate 321 and are connected to the multi-jaw chuck 322 to control its raising and lowering. The telescopic cylinders 324 are hydraulic cylinders.

[0028] In addition, the jaws of the multi-jaw chuck 322 are provided with a rectangular array of telescopic springs 3220. In this embodiment, there are four telescopic springs 3220. The other end of the telescopic springs 3220 is connected to a clamping seat 3221 for fitting with the grouting conduit 2. With this design, the clamping seat 3221 can be adapted to the tilted grouting conduit 2 by the extension and retraction of different telescopic springs 3220.

[0029] With this design, the grouting conduit 2 can be automatically inserted and removed by the extension and retraction of the telescopic cylinder 324 in conjunction with the clamping and releasing of the multi-jaw chuck 322. In addition, it should be noted that a hydraulic station for controlling the telescopic cylinder 324 and the multi-jaw chuck 322 is also provided on site.

[0030] In a preferred embodiment, the correction mechanism 33 includes multiple lifting frames 330 disposed at the bottom of the guide frame 31. In this embodiment, there are four lifting frames 330. A fixed ring 331 is disposed at the bottom of the lifting frame 330. A rotating ring 332 is rotatably disposed on the inner side of the fixed ring 331. A concave-convex fit structure 3310 is disposed between the rotating ring 332 and the fixed ring 331, and a bearing is disposed at the fit. A driven bevel gear 333 is disposed at the top of the rotating ring 332. An extension platform 334 is disposed on the outer side of the fixed ring 331. A drive device 335 is disposed at the top of the extension platform 334. The drive device 335 is composed of a motor and a reducer. A transmission bevel gear 336 that cooperates with the driven bevel gear 333 is disposed on the output shaft of the drive device 335. Thus, the rotating ring 332 can be driven to rotate in the fixed ring 331 by the drive device 335.

[0031] In addition, a mounting base 337 is provided at the bottom of the rotating ring 332. A laser rangefinder 339 and a correction telescopic cylinder 338 located on the same vertical line are provided on the mounting base 337. The correction telescopic cylinder 338 is a hydraulic cylinder. There are two laser rangefinders 339. In this embodiment, the two laser rangefinders 339 are located on the upper and lower sides of the correction telescopic cylinder 338, respectively.

[0032] With this design, the rotation of the rotating ring 332 can drive two laser rangefinders 339 to rotate around the grouting conduit 2 for multi-point measurement. The offset of the grouting conduit 2 during the insertion process can be calculated by the measurement data. Then, the rotation of the rotating ring 332 can drive the correction telescopic cylinder 338 to the corresponding correction position, and the correction work can be completed by the correction telescopic cylinder 338.

[0033] In the preferred embodiment, slide rails 306 are symmetrically arranged on both sides of the horizontal frame 301, and slide grooves 311 that slide and cooperate with the slide rails 306 are arranged on both sides of the guide frame 31. A push-pull telescopic cylinder 305 is provided on the horizontal frame 301. The push-pull telescopic cylinder 305 is a hydraulic cylinder, and the telescopic end of the push-pull telescopic cylinder 305 is connected to the guide frame 31.

[0034] With this design, the guide frame 31 and its devices can be moved appropriately by pushing and pulling the telescopic cylinder 305, thereby adjusting the specific insertion position of the grouting pipe 2.

[0035] Example 2 To further illustrate with reference to Example 1, a construction method for a steel sheet pile duct grouting support structure for soft soil foundation described in the above examples is provided, the method comprising: S1. Drive the main body of steel sheet piles along the support line to the design elevation.

[0036] S2. According to the arrangement spacing of the grouting pipes 2, install the pipe insertion and support mechanism 3 onto the steel sheet pile body 1, wherein the arrangement spacing of the grouting pipes 2 is 0.1 to 0.2 times the length of the steel sheet pile body 1.

[0037] S3. Hoist the grouting pipe 2 into the corresponding pipe insertion and support mechanism 3, and vertically insert the grouting pipe 2 into the soft soil foundation on the back of the sheet pile body 1 through the pipe insertion and support mechanism 3. The specific insertion method of the grouting pipe 2 is as follows: Hoist the grouting pipe 2 onto the pipe insertion and support mechanism 3, and pass through the pipe insertion and support mechanism 32, guide frame 31 and correction mechanism 33. The telescopic cylinder 324 retracts, raising the multi-jaw chuck 322 which is in an unclamped state. Then, the multi-jaw chuck 322 clamps the grouting pipe 2. After clamping, the telescopic cylinder 324 extends and presses down the multi-jaw chuck 322, thereby inserting part of the grouting pipe 2 into the soft soil foundation. Then, the correction mechanism 33 corrects its deviation. Repeat the above arrangement until the grouting pipe 2 is inserted to the preset depth. Then, the multi-jaw chuck 322 holds the grouting posture. When it is necessary to pull it out, simply reverse the above operation.

[0038] In addition, the specific method for correction is as follows: the driving device 335 drives the rotating ring 332 to rotate, and two laser rangefinders 339 installed on the same vertical line at different heights collect polar coordinate data of the outer wall of the grouting pipe 2 around one revolution, and convert them into rectangular coordinates. ; in, For laser rangefinders at angles The radius distance measured at that location, , These are the transformed Cartesian coordinates; The center coordinates of the circles are obtained by fitting, and are denoted as the lower height center and the upper height center, respectively: ; in, The coordinates of the center of the pipe section fitted by the rangefinder below. The coordinates of the center of the pipe section fitted by the overhead rangefinder; This yields the pipe's axial vector: ; in, Indicates the direction vector of the pipe axis; Will Vertical direction of the ideal The pipe inclination angle is obtained by calculating the included angle: ; in, The angle of inclination of the pipe relative to the vertical direction; Simultaneously calculate the center point of the pipeline: ; in, The average point of the centers of the upper and lower rangefinders represents the geometric center of the pipeline. Let the ideal target center be The deviation is: ; in, This represents the actual horizontal deviation of the pipe center. These are the horizontal offsets; Determine the unit vector of the corrective telescopic cylinder's direction of action based on the direction of deviation: ; in, The operating angle for installing the telescopic cylinder; The required stroke of the telescopic cylinder for correction is: ; in, This refers to the extension / retraction amount of the telescopic cylinder. This represents the projection of the center deviation onto the direction of the telescopic cylinder's action. This is the correction gain generated per unit stroke. The negative sign indicates that the direction of the telescopic cylinder's movement is opposite to the direction of the deviation, and it is used to eliminate pipeline deviation.

[0039] S4. Install the grouting mechanism 4 and the airbag inflation / deflation device of the sealed airbag 4063. Then, put the single-port sealed grouting part 406 of the grouting end of the soft air tube 4065 into the grouting conduit 2. Grout each grouting port from bottom to top through the single-port sealed grouting part 406. The initial grouting pressure is set to 0.2MPa. According to the feedback of the grouting pressure sensor 404, it is gradually increased to the design pressure and stabilized for 3 minutes. The grouting flow rate is dynamically adjusted to the design theoretical flow rate according to the feedback of the flow meter 403. Grouting is stopped after the grouting volume reaches the theoretical value.

[0040] Specifically: First, determine the grouting design pressure: ; in, Design pressure for grouting, This is a correction factor, with a value range of 0.8. 1.2, For slurry viscosity, This is a constant term, equal to 0.2 MPa; Then, the grouting flow rate is controlled by the pressure deviation, specifically using a PID algorithm for adjustment. The PID adjustment formula is as follows: ; in, For a moment Grouting flow rate, The deviation is defined as: ; in, For the target grouting pressure, The proportionality coefficient represents the actual grouting pressure measured in real time. Integral coefficient Differential coefficients ; Finally, the theoretical grouting flow rate is calculated, and the theoretical flow rate satisfies: ; in, The theoretical grouting flow rate, The radius of diffusion of the grout in the soil. For the length of the grouting section, The soil porosity is used as the reference value. The grouting termination condition is determined by comparing the theoretical flow rate with the actual flow rate.

[0041] S5. After grouting is completed, cross-hole ultrasonic CT is used to test the integrity of the reinforced area. The strength test standard for the reinforced area is unconfined compressive strength ≥ 1.0 MPa at 7d and ≥ 2.0 MPa at 28d.

[0042] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A grouting guide pipe insertion and support device for soft soil foundation, comprising a steel sheet pile body (1) inserted into the soft soil foundation, a grouting guide pipe (2), and a guide pipe insertion and support mechanism (3), characterized in that: The guide tube insertion and support mechanism (3) includes a support frame (30) that can be installed on the top of the sheet pile body (1), a guide frame (31) is provided on the support frame (30), a guide tube insertion and extraction mechanism (32) is provided on the top of the guide frame (31), and a correction mechanism (33) is provided on the bottom. The guide frame (31) has a hole at its center for the grouting conduit (2) to pass through; The conduit insertion and removal mechanism (32) includes uprights (320) set at the four corners of the top of the guide frame (31). The top of the uprights (320) is provided with a top plate (321). The center of the top plate (321) is provided with a hole for the grouting conduit (2) to pass through. A multi-jaw chuck (322) for clamping the grouting conduit (2) is movably arranged between the top plate (321) and the guide frame (31). A sliding sleeve (323) is slidably fitted on the outside of the multi-jaw chuck (322). Two symmetrical telescopic cylinders (324) are provided on the top plate (321). The telescopic ends of the telescopic cylinders (324) pass through the top plate (321) and are connected to the multi-jaw chuck (322) to control its lifting and lowering.

2. The soft soil foundation grouting guide pipe insertion and support device according to claim 1, characterized in that: The support frame (30) includes a horizontal frame (301). One end of the horizontal frame (301) is provided with a hook (303) that can be hooked onto the web of the sheet pile body (1). The bottom of the hook (303) is provided with a V-shaped reinforcing frame (302) that is connected to the bottom of the horizontal frame (301). The inner side of the web of the sheet pile body (1) is provided with a plug groove (102) that can cooperate with the hook (303). The bottom of the plug groove (102) is provided with a through hole. The end of the hook (303) is provided with a fixing screw (304) that passes through the through hole and is threaded with a nut. The guide frame (31) is located at the end of the horizontal frame (301) away from the hook (303).

3. The soft soil foundation grouting guide pipe insertion and support device according to claim 2, characterized in that: The two flanges of the sheet pile body (1) and the two sides of the horizontal frame (301) are provided with corresponding elongated holes (101), and a tie rod (103) locked by a nut is provided between the two corresponding elongated holes (101) of the flange and the horizontal frame (301).

4. The soft soil foundation grouting guide pipe insertion and support device according to claim 1, characterized in that: The jaws of the multi-jaw chuck (322) are provided with a rectangular array of telescopic springs (3220), and the other end of the telescopic springs (3220) is connected to a clamping seat (3221) for fitting with the grouting conduit (2).

5. The soft soil foundation grouting guide pipe insertion and support device according to claim 1, characterized in that: The correction mechanism (33) includes multiple lifting frames (330) set at the bottom of the guide frame (31). A fixed ring (331) is set at the bottom of the lifting frame (330). A rotating ring (332) is rotatably set on the inner side of the fixed ring (331). A driven bevel gear (333) is set at the top of the rotating ring (332). An extension platform (334) is set on the outer side of the fixed ring (331). A drive device (335) is set at the top of the extension platform (334). A transmission bevel gear (336) that cooperates with the driven bevel gear (333) is set on the output shaft of the drive device (335). A mounting base (337) is set at the bottom of the rotating ring (332). A laser rangefinder (339) and a correction telescopic cylinder (338) located on the same vertical line are set on the mounting base (337). The number of laser rangefinders (339) is two.

6. The soft soil foundation grouting guide pipe insertion and support device according to claim 5, characterized in that: A convex-concave fitting structure (3310) is provided between the rotating ring (332) and the fixed ring (331).

7. The soft soil foundation grouting guide pipe insertion and support device according to claim 3, characterized in that: The horizontal frame (301) is symmetrically provided with slide rails (306) on both sides, and the guide frame (31) is provided with slide grooves (311) that slide with the slide rails (306) on both sides. The horizontal frame (301) is provided with push-pull telescopic cylinders (305), and the telescopic end of the push-pull telescopic cylinders (305) is connected to the guide frame (31).

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