Bridgehead transition section roadbed anti-settlement structure based on high-pressure jet grouting piles

Abstract

The utility model discloses a bridgehead transition section roadbed anti-settlement structure based on high-pressure jet grouting piles, which relates to the field of road bridge construction and comprises a rectangular frame, a grid frame is integrally formed in the rectangular frame, and extension arms capable of being opened and closed are arranged at four corners of the rectangular frame. A through hole is formed in each cross position of the grid frame in a penetrating mode. The high-pressure jet grouting pile is mixed with a soft soil layer through high-pressure jet grouting cement grout to form a continuous cement and soil composite consolidation body, the foundation bearing capacity and the impermeability can be remarkably improved, the settlement risk caused by soil compression or underground water permeation is reduced, meanwhile, the embedded rod and the cross-shaped plate are solidified in the cement column, and therefore the construction efficiency is improved. The liftable grid frame and the rectangular frame are attached to the ground to be connected and fixed by extruding the pressing plates, then the extension arms at the four corners are opened according to needs to increase the extension range, the strength of the bridgehead roadbed can be improved through soil layer reinforcement of the high-pressure jet grouting piles and laying of the grid frame, and the settlement condition of the bridgehead transition section roadbed is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of road and bridge construction technology, specifically to a roadbed anti-settlement structure based on high-pressure jet grouting piles for bridge abutment transition sections. Background Technology

[0002] The subgrade anti-settlement of the bridge approach transition section is one of the key designs in highway and railway engineering. Its purpose is to solve the problem of uneven settlement between the bridge and the subgrade, avoid the phenomenon of "bridge approach slab slab slab", and ensure driving safety, comfort and road durability.

[0003] Existing transition section backfilling technologies involve either earthwork filling or gradual approach slabs for bridge approach section treatment. The former uses earthwork filling, which results in significant settlement after backfilling. Over time, the bridge deck with earthwork backfilling will form a concave surface, causing vehicles to bounce when driving. Moreover, the construction speed is slow and the cycle is long. The latter can significantly improve the roadbed stiffness, but due to its own weight and the impact of vehicles, it can still cause the foundation to settle, resulting in settlement differences. Utility Model Content

[0004] The purpose of this utility model is to provide a roadbed anti-settlement structure based on high-pressure jet grouting piles for the bridge abutment transition section in order to solve the above problems, as detailed below.

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

[0006] This utility model provides a bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles, including a rectangular frame. The rectangular frame has an integrally formed grid frame inside. Each of the four corners of the rectangular frame is provided with an extension arm that can be opened and closed. Each cross intersection of the grid frame is provided with a through hole. A cross-shaped plate is provided below each through hole. The bottom surface of each cross-shaped plate is provided with an adjustable expansion plate. The upper surface of each cross-shaped plate is fixedly connected to an upper protruding rod that inserts into the through hole. The upper end of each upper protruding rod is provided with a clamping structure for moving the grid frame toward the cross-shaped plate. The bottom surface of each cross-shaped plate is fixedly connected to an interlocking rod that is compatible with cement grout columns.

[0007] Preferably, two ear plates are fixedly connected to both ends of the two side walls of the rectangular frame, and the extension arm is rotatably connected between the two ear plates.

[0008] Preferably, the end of the extension arm is fixedly connected to a friction pad that contacts the ear plate.

[0009] Preferably, the cross-shaped plate has movable slots extending through all four sides, each movable slot has a square block that fits into it with a gap, and the expansion plate is fixed vertically to the bottom surface of the square block. Each movable slot has an adjustment component for moving the square block.

[0010] Preferably, the adjusting assembly includes a threaded rod rotatably connected in the movable groove, and a threaded hole for threaded connection with the threaded rod is provided through the center of the square block.

[0011] Preferably, each of the movable slots has a scale on its upper side, and the scale is fixed to the upper surface of the cross-shaped plate and adapted to the square block.

[0012] Preferably, the clamping structure includes a sliding plate groove that runs through the side wall of the upper protruding rod. A pressure plate is inserted into the sliding plate groove, and the pressure plate is square in design and fits the sliding plate groove with a gap. The upper end of the upper protruding rod is provided with a support assembly for driving the pressure plate to move downward.

[0013] Preferably, the support assembly includes bolt holes formed on the upper surface of the upper protrusion, and the lower end of the bolt holes communicates with the slide groove. A bolt is threaded into the bolt holes, and the lower end of the bolt abuts against the upper side of the pressure plate.

[0014] Preferably, the length of the pressure plate is greater than the diameter of the perforation.

[0015] Preferably, a number of ring plates are fixedly connected to the rod body of the fitting rod.

[0016] The beneficial effects are:

[0017] High-pressure jet grouting piles mix cement grout with weak soil layers through high-pressure injection, forming a continuous cement-soil composite solidified body. This significantly improves the bearing capacity and impermeability of the foundation, reducing the risk of settlement caused by soil compression or groundwater infiltration. Simultaneously, embedded rods and cross-shaped plates are solidified in the cement column, and grid frames and rectangular frames can be hoisted and fixed to the ground by pressing pressure plates. The extension arms at the four corners can be opened as needed to increase the extension range. The soil reinforcement of the high-pressure jet grouting piles and the laying of the grid frame can improve the strength of the roadbed at the bridgehead, effectively reducing the settlement of the roadbed in the transition section of the bridgehead. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a bottom-view perspective view of this utility model;

[0021] Figure 3 This is a perspective view of the fitting rod of this utility model;

[0022] Figure 4 This is a three-dimensional cross-sectional view of the upper protruding rod of this utility model;

[0023] Figure 5 This is a perspective view of the cross-shaped plate of this utility model;

[0024] Figure 6 This is a split perspective view of the extension arm of this utility model.

[0025] The annotations in the attached figures are explained as follows:

[0026] 1. Rectangular frame; 2. Grid frame; 3. Extension arm; 301. Ear plate; 302. Friction pad; 4. Perforation; 5. Cross-shaped plate; 501. Movable groove; 502. Square block; 503. Threaded rod; 504. Threaded hole; 505. Scale; 6. Upper protruding rod; 601. Slide groove; 602. Pressure plate; 603. Bolt hole; 604. Bolt; 7. Expansion plate; 8. Fitting rod; 9. Ring plate. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] See Figures 1-6 As shown, this utility model provides a roadbed anti-settlement structure for bridge abutment transition section based on high-pressure jet grouting piles, including a rectangular frame 1. The rectangular frame 1 has an integrally formed grid frame 2. Each of the four corners of the rectangular frame 1 is provided with an extension arm 3 that can be opened and closed. Each cross intersection of the grid frame 2 is provided with a through hole 4. A cross-shaped plate 5 is provided below each through hole 4. The bottom surface of each cross-shaped plate 5 is provided with an adjustable expansion plate 7. The upper surface of each cross-shaped plate 5 is fixedly connected to an upper protruding rod 6 that inserts into the through hole 4. The upper end of each upper protruding rod 6 is provided with a pressing structure for moving the grid frame 2 toward the cross-shaped plate 5. The bottom surface of each cross-shaped plate 5 is fixedly connected to an interlocking rod 8 that is compatible with cement grout columns.

[0029] Reference Figure 6As shown, two ear plates 301 are fixedly connected to both ends of the two side walls of the rectangular frame 1. The extension arm 3 is rotatably connected between the two ear plates 301. The end of the extension arm 3 is fixedly connected to a friction pad 302 that contacts the ear plate 301. By rotating the extension arm 3, the overall coverage area of ​​the rectangular frame 1 can be increased, thereby helping to prevent settlement at the grid frame 2.

[0030] Reference Figure 5 As shown, the cross-shaped plate 5 has movable slots 501 extending through its four sides. Each movable slot 501 contains a square block 502 that fits into it with a clearance. The expansion plate 7 is vertically fixed to the bottom surface of the square block 502. Each movable slot 501 contains an adjustment component for moving the square block 502. The adjustment component includes a threaded rod 503 rotatably connected to the movable slot 501. A threaded hole 504, threadedly connected to the threaded rod 503, is extending through the center of the square block 502. Each movable slot 501 has a scale 505 on one side above it. The scale 505 is fixed to the upper surface of the cross-shaped plate 5 and fits the square block 502. Before the cement grout solidifies... Insert the fitting rod 8 and the four expansion plates 7 into the drill hole containing cement grout. Then rotate the four threaded rods 503 respectively. The threaded rods 503 are threadedly connected to the square block 502, and the square block 502 is restricted from rotating by the movable groove 501. This allows the threaded rods 503 to move the square block 502 in the movable groove 501 when they rotate (the rotation of the threaded rods 503 can be achieved using a power tool). Adjust the positions of the four square blocks 502 and the expansion plates 7 according to the scale 505 so that the expansion plates 7 abut against the inner wall of the upper end of the drill hole. The four ends of the cross-shaped plate 5 are all placed on the upper surface of the drill hole to prevent the cross-shaped plate 5 from falling into the drill hole. At this time, the upper protruding rod 6 is located in the middle of the drill hole.

[0031] Reference Figure 4 As shown, the clamping structure includes a sliding groove 601 that runs through the side wall of the upper protruding rod 6. A pressure plate 602 is inserted into the sliding groove 601, and the pressure plate 602 is square in design and fits with the sliding groove 601 with a clearance. The upper end of the upper protruding rod 6 is provided with a support assembly for driving the pressure plate 602 to move downward. The support assembly includes a bolt hole 603 opened on the upper surface of the upper protruding rod 6, and the lower end of the bolt hole 603 communicates with the sliding groove 601. A screw is threaded into the bolt hole 603. Bolt 604 is used, with its lower end abutting against the upper side of the pressure plate 602. After the upper protruding rod 6 passes through the through hole 4, the pressure plate 602 is inserted laterally into the sliding plate groove 601. At this time, the pressure plate 602 abuts against the upper surface of the grid frame 2 under the action of gravity. Then, the bolt 604 is rotated in the bolt hole 603, so that the end of the bolt 604 presses against the pressure plate 602, thereby driving the grid frame 2 and the rectangular frame 1 to fit against the ground and connect and fix with several embedded rods 8 solidified in the cement column.

[0032] As an optional implementation, the length of the pressure plate 602 is greater than the diameter of the perforation 4, which can prevent the pressure plate 602 from passing through the perforation 4 when placed horizontally, so that when the pressure plate 602 is brought into contact with the grid frame 2, it can be effectively pressed down to contact the ground.

[0033] Specifically, several ring plates 9 are fixedly connected to the rod body of the interlocking rod 8. The ring plates 9 can improve the bonding strength between the interlocking rod 8 and the cement grout column and prevent the interlocking rod 8 from loosening.

[0034] High-pressure jet grouting is used. The jet grouting pipe and nozzle are drilled to the designed depth (the drilling point is marked according to the cross intersection of the grid frame 2). Then, the high-pressure pump is started (the pressure is usually 20-40MPa), and cement grout is injected at high speed through the nozzle. At the same time, the drill rod rotates and is lifted at a speed of 10-20r / min (about 10-25cm / min), forming a columnar solidified body. Before the cement grout solidifies, the interlocking rod 8 and four expansion plates 7 are inserted into the drill hole containing cement grout. Then, the four expansion plates 7 are adjusted to abut against the inner wall of the upper end of the drill hole, so that the position of the upper protruding rod 6 is in the middle of the drill hole. After the cement grout solidifies, the cross-shaped plate 5 is... The grid frame 2 is fixed at the top of the borehole. Then, the grid frame 2 is hoisted so that several upper protruding rods 6 pass through the through hole 4. Then, the pressure plate 602 is inserted horizontally into the sliding plate groove 601. At this time, the pressure plate 602 abuts against the upper surface of the grid frame 2 under the action of gravity. Then, the bolt 604 is rotated in the bolt hole 603 so that the end of the bolt 604 squeezes the pressure plate 602, thereby driving the grid frame 2 and the rectangular frame 1 to fit against the ground and connect and fix with several embedded rods 8 solidified in the cement column. Then, the extension arms 3 at the four corners are opened as needed to increase the extension range. Then, a layer of soil or asphalt is laid on the foundation surface of the high-pressure jet grouting pile to completely fill and cover the grid frame 2 and compact it to complete the protection.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A roadbed anti-settlement structure for bridge abutment transition sections based on high-pressure jet grouting piles, characterized in that: The device includes a rectangular frame (1), inside which a grid frame (2) is integrally formed. Each of the four corners of the rectangular frame (1) is provided with an extension arm (3) that can be opened and closed. Each cross intersection of the grid frame (2) is provided with a through hole (4). Each through hole (4) is provided with a cross-shaped plate (5) below it. Each cross-shaped plate (5) is provided with an adjustable expansion plate (7) on its bottom surface. Each cross-shaped plate (5) is fixedly connected to the middle of its upper surface with an upper protruding rod (6) that inserts into the through hole (4). Each upper protruding rod (6) is provided with a pressing structure at its upper end to drive the grid frame (2) to move toward the cross-shaped plate (5). Each cross-shaped plate (5) is fixedly connected to the middle of its bottom surface with an interlocking rod (8) that is compatible with the cement grout column.

2. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 1, characterized in that: Two ear plates (301) are fixedly connected to both ends of the two side walls of the rectangular frame (1), and the extension arm (3) is rotatably connected between the two ear plates (301).

3. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 2, characterized in that: The end of the extension arm (3) is fixedly connected to a friction pad (302) that contacts the ear plate (301).

4. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 1, characterized in that: The cross-shaped plate (5) has movable slots (501) through all four sides. Each movable slot (501) has a square block (502) that fits with it. The expansion plate (7) is fixed vertically to the bottom surface of the square block (502). Each movable slot (501) has an adjustment component for moving the square block (502).

5. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 4, characterized in that: The adjustment assembly includes a threaded rod (503) rotatably connected in the movable groove (501), and a threaded hole (504) is provided in the middle of the square block (502) for threaded connection with the threaded rod (503).

6. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 4, characterized in that: Each of the movable slots (501) has a scale (505) on one side above it, and the scale (505) is fixed to the upper surface of the cross-shaped plate (5) and adapted to the square block (502).

7. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 1, characterized in that: The pressing structure includes a sliding plate groove (601) that runs through the side wall of the upper protruding rod (6). A pressure plate (602) is inserted into the sliding plate groove (601), and the pressure plate (602) is square and fits the sliding plate groove (601) with a gap. The upper end of the upper protruding rod (6) is provided with a support assembly for driving the pressure plate (602) to move downward.

8. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 7, characterized in that: The support assembly includes a bolt hole (603) on the upper surface of the upper protruding rod (6), and the lower end of the bolt hole (603) is connected to the slide groove (601). A bolt (604) is threaded into the bolt hole (603), and the lower end of the bolt (604) abuts against the upper side of the pressure plate (602).

9. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 8, characterized in that: The length of the pressure plate (602) is greater than the diameter of the perforation (4).

10. The bridge abutment transition section subgrade anti-settlement structure based on high-pressure jet grouting piles according to claim 1, characterized in that: Several ring plates (9) are fixedly connected to the rod body of the fitting rod (8).

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