Foundation pit support steel sheet pile replacement device

Abstract

This invention discloses a sheet pile replacement device for foundation pit support, comprising a base plate, a vertical plate fixedly connected to the upper center of the base plate, and support devices on both sides of the vertical plate. Each support device includes a fixed guide rod, which is fixedly connected to the side of the vertical plate and slidably connected to a support sleeve. A support block is provided at the end of the support sleeve. A support cylinder is fixedly connected to the side of the vertical plate, and the telescopic rod of the support cylinder is fixedly connected to the support sleeve. This invention uses support wheels to sequentially push the inclined and hinged protective plates vertically, providing support and protection for the exposed sidewalls of the foundation pit after the sheet piles are pulled out. It promptly supports the soil after the sheet piles are pulled out, preventing collapse, and grouting through grouting pipes facilitates the subsequent insertion of new sheet piles, improving the water-stopping effect.

Description

Technical Field

[0001] This invention relates to the field of sheet pile support technology for foundation pits, and in particular to a sheet pile replacement device for foundation pit support. Background Technology

[0002] Larssen sheet piles, also known as U-shaped sheet piles, are a new type of building material that plays an important role in engineering projects such as bridge cofferdams, large pipeline laying, temporary ditch excavation as retaining walls, water barriers, and sand barriers; and as protective walls, retaining walls, and embankment protection at docks and unloading yards.

[0003] After repeated use, sheet piles are prone to interlock deformation. After the soil in the foundation pit is excavated, the sheet pile at that location deforms, causing water to seep into the foundation pit from the surrounding soil, and the sheet pile fails to stop the water leakage. The conventional method is to inject grout into the soil outside the sheet pile to plug the leakage. However, it is not easy to accurately reach the leakage point when grouting from the outside. When maintenance is carried out by pulling out the deformed sheet pile, it has a significant impact on the overall support performance of other sheet piles. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a steel sheet pile replacement device for foundation pit support, thereby solving the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sheet pile replacement device for foundation pit support includes a base plate, a vertical plate fixedly connected to the upper middle part of the base plate, and support devices on both sides of the vertical plate. Each support device includes a fixed guide rod, which is fixedly connected to the side of the vertical plate. The fixed guide rod is slidably connected to a support sleeve, and a support block is provided at the end of the support sleeve. A support cylinder is fixedly connected to the side of the vertical plate, and the telescopic rod of the support cylinder is fixedly connected to the support sleeve.

[0007] It also includes a movable guide rod. The vertical plate is provided with a sliding groove, and a slider is slidably connected in the sliding groove. A hydraulic cylinder is fixedly connected to the upper side of the vertical plate. The telescopic rod of the hydraulic cylinder is fixedly connected to the slider. The movable guide rod is fixedly connected to the side of the slider. The movable guide rod is slidably connected to a movable sleeve. The outer end of the movable sleeve is rotatably connected to a support wheel. The outer end of the support sleeve is sequentially hinged to multiple guard plates. The guard plates are provided with grouting pipes.

[0008] Preferably, a guide post is fixedly connected to one side of the support sleeve, and a side plate is fixedly connected to one side of the movable sleeve. The side plate is provided with a guide hole, and the guide post passes through the guide hole.

[0009] Preferably, the upper end of the vertical plate is fixedly connected to a crossbeam, the crossbeam is slidably connected to a sliding sleeve, and the upper end of the guide column is fixedly connected to the sliding sleeve.

[0010] Preferably, a diagonal bracing beam is fixedly connected between the bottom of the crossbeam and the side of the vertical plate.

[0011] Preferably, a horizontal plate is fixedly connected to the outer end of the support sleeve. The cross-section of the horizontal plate is dovetail-shaped or "T"-shaped, and support blocks are inserted and fixedly connected to both ends of the horizontal plate.

[0012] Preferably, the protective plate is fixedly connected to an arc-shaped guide tube, one end of which is fixedly connected to two limiting strips. The grouting pipe has an arc-shaped structure, and one end of which is fixedly connected to two easily broken plates. The easily broken plates are provided with limiting slots, which are adapted to the limiting strips.

[0013] The arc-shaped guide tube is slidably connected to an arc-shaped push rod. One end of the arc-shaped push rod is fixedly connected to a baffle. A reset spring is fixedly connected between the baffle and the arc-shaped guide tube. The support wheel can push the baffle by rolling. The arc-shaped push rod is set correspondingly to the grouting pipe.

[0014] Preferably, the grouting pipe stores cement slurry, the inner tube of the grouting pipe is slidably connected to a piston plate, the inner tube wall of the grouting pipe is provided with a limiting protrusion, an arc-shaped rod is fixedly connected to one side of the piston plate, and a blocking plate is provided at the end of the arc-shaped rod. Both the blocking plate and one end of the grouting pipe are set as inclined surfaces.

[0015] Preferably, the arc-shaped rod is hinged to the blocking plate, and the hinge axis of the arc-shaped rod is located at the lower bottom of the blocking plate.

[0016] The advantages of this invention are:

[0017] The sheet pile replacement device for foundation pit support provided by this invention is hoisted into the foundation pit. The support cylinders on both sides push the support sleeve to both sides, and the corresponding support blocks press on the two sheet piles on the outer side of at least three sheet piles. When the sheet pile between the two sheet piles is pulled out and replaced later, the hydraulic cylinder lifts the slider upward, and the support wheel at the end of the moving sleeve pushes the inclined and hinged guard plate vertically in sequence. This provides support and protection for the exposed side wall of the foundation pit after the sheet pile is pulled out, and timely supports the soil after the sheet pile is pulled out to prevent collapse. Grouting is also carried out through the grouting pipe to facilitate the subsequent insertion of new sheet piles and improve the water-stopping effect.

[0018] This invention stores cement grout in a grouting pipe, which then presses the soil to solidify it. As the support wheel rolls and presses against the baffle, it pushes an arc-shaped push rod into the pit. The arc-shaped push rod acts on a piston plate, pushing the piston plate forward within the grouting pipe, causing the baffle plate to detach from the grouting pipe. This opens the front end of the grouting pipe, facilitating the entry of cement grout into the soil. When the piston plate encounters a limiting protrusion and is blocked, the arc-shaped push rod pushes the grouting pipe and piston plate together, further penetrating the soil. Simultaneously, the easily breakable plate breaks and separates, reducing the probability of subsequent sheet pile insertion being blocked by the grouting pipe. The combined effect of soil reinforcement and grout solidification on the pit sidewall at the sheet pile replacement site provides support, reinforcement, and leak sealing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the basic structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the support structure of the wheel pair guard plate of the present invention;

[0021] Figure 3 yes Figure 2 Enlarged view of section E in the image;

[0022] Figure 4 yes Figure 3 Enlarged view of section F in the image;

[0023] Figure 5 This is a schematic diagram of the support work of the present invention in the foundation pit. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] like Figure 1-5 As shown, the present invention provides a steel sheet pile replacement device for foundation pit support, including a base plate 1, a vertical plate 2 fixedly connected to the middle of the upper side of the base plate 1, and support devices 3 provided on both sides of the vertical plate 2. Each support device 3 includes a fixed guide rod 31, which is fixedly connected to the side of the vertical plate 2. The fixed guide rod 31 is slidably connected to a support sleeve 32, and two support blocks 33 are provided at the end of the support sleeve 32. A support cylinder 34 is fixedly connected to the side of the vertical plate 2, and the telescopic rod of the support cylinder 34 is fixedly connected to the support sleeve 32. When the foundation pit is deep, a support cylinder 34, a fixed guide rod 31, and a support sleeve 32 with the same structure are set at the top of the vertical plate 2 to form a temporary top support and improve the support safety.

[0026] It also includes a movable guide rod 35, the vertical plate 2 is provided with a sliding groove 36, a slider 37 is slidably connected in the sliding groove 36, a hydraulic cylinder 38 is fixedly connected to the upper side of the vertical plate 2, the telescopic rod of the hydraulic cylinder 38 is fixedly connected to the slider 37, the movable guide rod 35 is fixedly connected to the side of the slider 37, the movable guide rod 35 is slidably connected to a movable sleeve 39, the outer end of the movable sleeve 39 is rotatably connected to a support wheel 391, and the outer end of the support sleeve 32 is sequentially hinged to multiple guard plates 4, the guard plates 4 are provided with grouting pipes 5.

[0027] The invention involves hoisting the sheet pile into the foundation pit. The support cylinders 34 on both sides push the support sleeve 32 to both sides, and the corresponding support block 33 presses on the two outer sheet piles of at least three sheet piles. When the sheet pile between the two outer sheet piles is subsequently pulled out and replaced, the hydraulic cylinder 38 lifts the slider 37 upward, and the support wheel 391 at the end of the moving sleeve 39 pushes the inclined and hinged guard plate 4 vertically in sequence, providing support and protection for the exposed side wall of the foundation pit after the sheet pile is pulled out, timely supporting the soil after the sheet pile is pulled out to prevent collapse, and grouting is carried out through the grouting pipe 5 to facilitate the subsequent insertion of new sheet piles and improve the water-stopping effect.

[0028] The support sleeve 32 is fixedly connected to a guide post 321 on one side, and the movable sleeve 39 is fixedly connected to a side plate 322 on one side. The side plate 322 is provided with a guide hole, and the guide post 321 passes through the guide hole to guide the vertical movement of the movable sleeve 39.

[0029] In one embodiment of the present invention, the upper end of the vertical plate 2 is fixedly connected to the horizontal beam 21, the horizontal beam 21 is slidably connected to the sliding sleeve 22, the upper end of the guide column 321 is fixedly connected to the sliding sleeve 22, and the bottom of the horizontal beam 21 is fixedly connected to the side of the vertical plate 2 by the diagonal bracing beam 23. After the position of the guide column 321 changes with the position of the support sleeve 32, the position of the guide column 321 can be adjusted synchronously. The diagonal bracing beam 23 provides support and reinforcement for the horizontal beam 21.

[0030] In one embodiment of the present invention, the outer end of the support sleeve 32 is fixedly connected to the horizontal plate 331. The cross section of the horizontal plate 331 is dovetail-shaped or "T"-shaped. The two ends of the horizontal plate 331 are inserted and fixedly connected to the support block 33 by bolts. Since the steel sheet pile has a structure in which the positive and negative concave and convex edges are locked together, the support block 33 is designed with a set of convex molds and a set of concave molds according to the shape of the steel sheet pile, so as to facilitate the selection of the shape of the support block 33 according to the external convexity or internal concavity of the steel sheet pile.

[0031] In one embodiment of the present invention, the protective plate 4 is fixedly connected to the arc-shaped conduit 51, and one end of the arc-shaped conduit 51 is fixedly connected to two limiting strips 52. The grouting pipe 5 has an arc-shaped structure, and one end of the grouting pipe 5 is fixedly connected to two easily broken plates 53. The easily broken plates 53 are provided with limiting slots 54, and the limiting slots 54 are adapted to the limiting strips 52.

[0032] The arc-shaped guide tube 51 is slidably connected to an arc-shaped push rod 55. One end of the arc-shaped push rod 55 is fixedly connected to a baffle 56. A reset spring 57 is fixedly connected between the baffle 56 and the arc-shaped guide tube 51. The support wheel 391 can push the baffle 56 by rolling. The arc-shaped push rod 55 is set in correspondence with the grouting pipe 5.

[0033] In this embodiment, the support wheel 391 rolls on the protective plate 4, pushing the protective plate 4 vertically and fitting it against the side wall of the foundation pit that has lost the support of the sheet piles. The curvature of the grouting pipe 5 is based on the hinge axis of the protective plate 4, which facilitates its insertion into the soil as the protective plate 4 rotates. When the support wheel 391 rolls and presses against the baffle 56, it pushes the arc-shaped push rod 55 into the foundation pit. The arc-shaped push rod 55 acts on the grouting pipe 5, causing the easily broken plate 53 to break, leaving the grouting pipe 5 on the inner wall of the foundation pit soil. With the grouting liquid, the soil at the location of water leakage in the inner wall of the foundation pit is reinforced.

[0034] Furthermore, the grouting pipe 5 stores cement grout, which is injected into the grouting pipe 5 before the support operation to solidify the soil within the soil. The inner tube of the grouting pipe 5 is slidably connected to the piston plate 6, and the inner wall of the grouting pipe 5 is provided with a limiting protrusion 61. An arc-shaped rod 62 is fixedly connected to one side of the piston plate 6, and a blocking plate 63 is provided at the end of the arc-shaped rod 62. Both the blocking plate 63 and one end of the grouting pipe 5 are set as inclined surfaces. During operation, the support wheel 391 rolls and presses against the baffle 56, pushing the arc-shaped push rod 55 into the pit. The arc-shaped push rod 55 acts on the piston plate 6. The piston plate 6 is pushed forward inside the grouting pipe 5, causing the blocking plate 63 to disengage from the grouting pipe 5. The front end of the grouting pipe 5 opens, facilitating the entry of cement grout into the soil. When the piston plate 6 is blocked by the limiting protrusion 61, the arc-shaped push rod 55 pushes the grouting pipe 5 and the piston plate 6 as a whole to penetrate deeper into the soil. At the same time, the easily broken plate 53 breaks and separates. After the steel sheet piles are re-inserted, the probability of being blocked by the grouting pipe 5 is small. The soil reinforcement and grouting solidification work together on the side wall of the foundation pit at the steel sheet pile replacement site, taking into account the effects of support, reinforcement, and leakage sealing.

[0035] Furthermore, the arc-shaped rod 62 is hinged to the blocking plate 63, and the hinge axis of the arc-shaped rod 62 is located at the bottom lower end of the blocking plate 63. When the arc-shaped rod 62 and the blocking plate 63 extend out of the grouting pipe 5 and advance independently, the blocking plate 63 is further tilted to reduce the obstruction surface and the resistance to advance is small, which facilitates advancement in the soil.

[0036] The overall working principle of this invention:

[0037] The support sleeve 32 is placed into the pit by hoisting. The support cylinders 34 on both sides push the support sleeve 32 to both sides. The corresponding support block 33 presses on the two outer steel sheet piles of at least three steel sheet piles. When the steel sheet pile between the two steel sheet piles is pulled out and replaced later, the hydraulic cylinder 38 lifts the slider 37 upward. The support wheel 391 at the end of the moving sleeve 39 pushes the inclined and hinged guard plate 4 vertically in sequence to form protection.

[0038] As the support wheel 391 rolls and presses against the baffle 56, the arc-shaped push rod 55 is pushed into the pit. The arc-shaped push rod 55 acts on the piston plate 6, pushing the piston plate 6 forward inside the grouting pipe 5, causing the blocking plate 63 to disengage from the grouting pipe 5. The front end of the grouting pipe 5 opens, facilitating the entry of cement slurry into the soil. When the piston plate 6 is blocked by the limiting protrusion 61, the arc-shaped push rod 55 pushes the grouting pipe 5 and the piston plate 6 as a whole to penetrate deeper into the soil. At the same time, the easily broken plate 53 breaks and separates. After the subsequent steel sheet piles are re-inserted, the probability of being blocked by the grouting pipe 5 is small. The soil reinforcement and grouting solidification work together on the side wall of the pit where the steel sheet piles are replaced, taking into account the effects of support, reinforcement, and leakage plugging.

[0039] Finally, as the replaced sheet piles are reinserted, the support wheel 391 is gradually lowered, and the guard plate 4 tilts and resets in sequence under the action of gravity.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sheet pile replacement device for foundation pit support, comprising a base plate (1), a vertical plate (2) fixedly connected to the middle of the upper side of the base plate (1), and support devices (3) provided on both sides of the vertical plate (2). Each support device (3) includes a fixed guide rod (31), the fixed guide rod (31) is fixedly connected to the side of the vertical plate (2), the fixed guide rod (31) is slidably connected to a support sleeve (32), a support block (33) is provided at the end of the support sleeve (32), a support cylinder (34) is fixedly connected to the side of the vertical plate (2), and the telescopic rod of the support cylinder (34) is fixedly connected to the support sleeve (32). It also includes a movable guide rod (35), the vertical plate (2) is provided with a slide groove (36), a slider (37) is slidably connected in the slide groove (36), a hydraulic cylinder (38) is fixedly connected to the upper side of the vertical plate (2), the telescopic rod of the hydraulic cylinder (38) is fixedly connected to the slider (37), the movable guide rod (35) is fixedly connected to the side of the slider (37), the movable guide rod (35) is slidably connected to a movable sleeve (39), the outer end of the movable sleeve (39) is rotatably connected to a support wheel (391), and the outer end of the support sleeve (32) is hinged to multiple A series of hinged guard plates (4) are provided with grouting pipes (5); the hydraulic cylinder (38) lifts the slider (37) upward, and the support wheel (391) at the end of the movable sleeve (39) pushes the inclined and hinged guard plates (4) vertically in sequence; a guide column (321) is fixedly connected to one side of the support sleeve (32), and a side plate (322) is fixedly connected to one side of the movable sleeve (39). The side plate (322) is provided with a guide hole, and the guide column (321) passes through the guide hole.

2. The steel sheet pile replacement device for a foundation pit support according to claim 1, characterized in that: The upper end of the vertical plate (2) is fixedly connected to the horizontal beam (21), the horizontal beam (21) is slidably connected to the sliding sleeve (22), and the upper end of the guide column (321) is fixedly connected to the sliding sleeve (22).

3. The steel sheet pile replacement device for a foundation pit support according to claim 2, characterized in that: The bottom of the crossbeam (21) is fixedly connected to the side of the vertical plate (2) by a diagonal bracing beam (23).

4. The steel sheet pile replacement device for a foundation pit support according to claim 1, characterized in that: The outer end of the support sleeve (32) is fixedly connected to the horizontal plate (331). The cross section of the horizontal plate (331) is dovetail-shaped or "T"-shaped. The two ends of the horizontal plate (331) are inserted and fixedly connected to the support blocks (33).

5. The sheet pile replacement device for foundation pit support according to claim 1, characterized in that: The protective plate (4) is fixedly connected to the arc-shaped guide tube (51), and two limiting strips (52) are fixedly connected to one end of the arc-shaped guide tube (51). The grouting pipe (5) has an arc-shaped structure, and two easily broken plates (53) are fixedly connected to one end of the grouting pipe (5). The easily broken plate (53) is provided with a limiting slot (54), and the limiting slot (54) is compatible with the limiting strip (52). The arc-shaped guide tube (51) is slidably connected to an arc-shaped push rod (55). One end of the arc-shaped push rod (55) is fixedly connected to a baffle (56). A reset spring (57) is fixedly connected between the baffle (56) and the arc-shaped guide tube (51). The support wheel (391) can push the baffle (56) when it rolls. The arc-shaped push rod (55) is set in correspondence with the grouting pipe (5).

6. The sheet pile replacement device for foundation pit support according to claim 5, characterized in that: The grouting pipe (5) stores cement slurry. The inner tube of the grouting pipe (5) is slidably connected to the piston plate (6). The inner tube wall of the grouting pipe (5) is provided with a limiting protrusion (61). An arc-shaped rod (62) is fixedly connected to one side of the piston plate (6). A blocking plate (63) is provided at the end of the arc-shaped rod (62). Both the blocking plate (63) and one end of the grouting pipe (5) are set as inclined surfaces.

7. The sheet pile replacement device for foundation pit support according to claim 6, characterized in that: The arc-shaped rod (62) is hinged to the blocking plate (63), and the hinge axis of the arc-shaped rod (62) is located at the bottom lower end of the blocking plate (63).

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