Adjustable retaining wall for pile foundation construction in soft soil poor ground

Abstract

The utility model is used for building construction technical field discloses a pile foundation construction adjustable protection wall suitable for soft soil bad section, including contact disc, the upper surface of contact disc installs the support column of rotation, and the upper end of support column is fixedly installed with contact board, the upper surface of contact disc is fixedly provided with the sleeve, and the inside of sleeve is inserted with the anchor rod. This pile foundation construction adjustable protection wall suitable for soft soil bad section, through the linkage structure of support column, contact board, function ring and extrusion block, realize the dynamic adaptation support to the protection cylinder: the contact board of arc design is directly pasted with the outer wall of protection cylinder, and the contact board is fixed on the upper end of support column, when the soft soil is laterally extruded or the hole wall is reduced in diameter because of construction disturbance, the extrusion block of right angle trapezoidal design can extrude support column through the inclined plane, push the contact board to the direction of protection cylinder and press tightly to ensure that the protection cylinder is always closely pasted with the hole wall, and the hole wall is not collapsed.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to an adjustable retaining wall for pile foundation construction in soft soil and poor terrain. Background Technology

[0002] In the field of pile foundation construction in building engineering, pile foundation is the core component that bears the load of the superstructure. Its construction quality directly determines the overall safety and stability of the project. Especially in poor areas such as soft soil and silty soil, due to the engineering characteristics of the soil such as high water content, large void ratio, low bearing capacity, poor self-stability and easy creep deformation, quality defects such as hole wall collapse, diameter reduction and pile body displacement are very likely to occur during the pile foundation hole formation and pile body forming process. This not only leads to difficulties in lowering the steel cage and insufficient pile body cross section, but may also cause safety risks such as foundation pit leakage and ground subsidence, which seriously restricts construction efficiency and project quality. To address the issue of pile foundation support and protection in soft soil areas, existing technologies primarily employ two types of solutions: rigid retaining walls and simple adjustable retaining walls. Rigid retaining walls, such as reinforced concrete well ring retaining walls and steel casing retaining walls, use pre-set, fixed-size support structures to resist lateral soil pressure. While these solutions provide a certain level of support strength, they have significant limitations: First, soft soil is prone to lateral compression deformation under construction disturbances. Fixed-size rigid structures cannot adapt to changes in borehole wall morphology, easily leading to localized stress concentration and cracking of the retaining wall. This is especially problematic in areas with reduced borehole diameter, where gaps can easily form between the retaining wall and the borehole wall, resulting in a loss of effective support. Second, rigid structures such as steel casings require precise customization to match the pile diameter, resulting in poor versatility. Furthermore, controlling the verticality of the casings during installation in soft soil is difficult, and the recovery process after concrete pouring can easily disturb the surrounding soil, affecting the pile's bearing capacity.

[0003] Simple adjustable retaining walls improve the adaptability of rigid retaining walls to some extent by setting telescopic support components to adapt to the hole wall size. However, existing adjustable structures generally suffer from insufficient coordination between support and anchoring: most support components adopt a single independent adjustment method, which is cumbersome to operate and makes it difficult to ensure uniform distribution of support force in the circumferential direction, which can easily lead to pile body deflection due to force imbalance; at the same time, existing anchoring mechanisms mostly use anchor rods set vertically or at a fixed angle, but the pull-out bearing capacity of anchor rods in soft soil is closely related to the anchoring angle. Fixed angle design cannot make full use of soil friction resistance, resulting in insufficient anchoring stability. In addition, in existing technologies, support adjustment and anchoring locking are mostly independent operation procedures. After adjusting the support force, anchoring reinforcement cannot be achieved simultaneously. Under the action of soft soil creep, the retaining wall is prone to loosening and sinking, making it difficult to form a continuous and reliable pile body support system. To address the aforementioned shortcomings, there is an urgent need to develop a pile foundation retaining wall structure that can adapt to the deformation characteristics of soft soil, achieve uniform adjustment of support force and reliable anchoring linkage. By optimizing the collaborative working mechanism of the support mechanism and the anchoring system, the safety and convenience of pile foundation construction in soft soil areas can be improved, and the core problems of poor adaptability, unreliable anchoring and cumbersome operation in existing technologies can be solved. Utility Model Content

[0004] The purpose of this utility model is to provide an adjustable retaining wall for pile foundation construction in soft soil areas, so as to solve the problems mentioned in the background art, such as poor adaptability of existing pile foundation retaining walls in soft soil areas, insufficient coordination between support and anchorage, low anchorage stability, cumbersome operation, and difficulty in adapting to soft soil deformation, which can easily lead to loosening of the retaining wall and deflection of the pile body.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adjustable retaining wall for pile foundation construction in soft soil areas, comprising a contact plate, a rotating support column mounted on the upper surface of the contact plate, a contact plate fixedly mounted on the upper end of the support column, a sleeve fixedly mounted on the upper surface of the contact plate, an anchor rod inserted into the inner side of the sleeve, a rotating ring mounted on the upper surface of the contact plate, a limit rod connected to the inner surface of the ring, a mounting frame mounted on the upper surface of the ring, a functional ring fixedly connected to the upper end of the mounting frame, and a pressing block fixedly mounted on the inner surface of the functional ring, the mounting frame being fixedly mounted to the ring by locking bolts, and a protective sleeve mounted on the inner side of the contact plate; An extrusion plate is fixedly provided on the outer surface of the rotating ring, and an installation plate is fixedly provided on the outer surface of the contact plate directly opposite the extrusion plate, and a push bolt is threadedly connected to the upper surface of the installation plate. The inner surface of the functional ring is provided with a relief groove, which is U-shaped and is set in a one-to-one correspondence with the support column. The width of the relief groove is greater than the outer diameter of the support column.

[0006] Preferably, the support columns are arranged at equal angles on the upper surface of the contact plate, and a spring connects the support columns and the contact plate; the contact plate has an arc-shaped design.

[0007] By adopting the above technical solution, the equally distributed support columns can ensure uniform coverage of the circumferential support force on the casing, avoiding casing displacement or deformation due to uneven local force. The spring between the support column and the contact plate can provide buffer when the force applied by the extrusion block changes, which not only adapts to the adjustment requirements of the support force due to the dynamic deformation of soft soil, but also drives the support column to reset when the support force weakens. The arc-shaped contact plate can increase the contact area with the outer wall of the casing, reduce local pressure, avoid damage to the casing due to concentrated force, and further improve the support fit, ensuring stable constraint of the casing.

[0008] Preferably, the sleeve and the anchor rod are inclined, and the lower end of the anchor rod is oriented downward toward the outside of the contact plate.

[0009] By adopting the above technical solution, the inclined design allows the lower end of the anchor rod to penetrate deeper into the soft soil, forming a larger contact area and friction angle with the soft soil. Compared with vertical or fixed-angle anchor rods, it can maximize the use of the frictional resistance of the soft soil, significantly improve the pull-out bearing capacity of the anchor structure, and the setting direction of the anchor rod towards the outside of the contact plate can further disperse the downward pressure of the entire retaining wall, prevent the contact plate from sinking due to the low bearing capacity of the soft soil, and provide a stable bottom anchoring foundation for the retaining wall.

[0010] Preferably, the limiting rod is L-shaped, with one end of the limiting rod passing through the sleeve and the anchor rod, and the end of the limiting rod passing through the sleeve and the anchor rod engaging with the sleeve and the anchor rod.

[0011] Using the above technical solution, the L-shaped structure facilitates the connection and fixation of the limiting rod and the rotating ring, and can form a "pin-type" lock through the end of the sleeve and the anchor rod, effectively limiting the axial displacement of the anchor rod in the sleeve. The snap-fit ​​connection method can ensure the connection stability of the limiting rod, the sleeve, and the anchor rod, and prevent the anchor rod from loosening or shifting during the creep of soft soil, further strengthening the anchoring effect and providing continuous and reliable anchoring constraints for the entire retaining wall.

[0012] Preferably, the extrusion block is designed as a right-angled trapezoid, with the inclined surface of the extrusion block facing the support column, and the extrusion block and the support column are designed to correspond one-to-one.

[0013] By adopting the above technical solution, the inclined plane of the right trapezoid can convert the rotational motion of the functional ring into a lateral compressive force on the support column. The guide effect of the inclined plane smoothly pushes the support column towards the casing, avoiding structural damage caused by direct hard contact. The one-to-one correspondence design can ensure that each support column is subjected to uniform compressive force, thereby enabling the contact plate to apply synchronous and balanced circumferential support force to the casing. This solves the problem of force imbalance that is prone to occur in traditional single-group adjustment and is suitable for the uniform support requirements of casing in soft soil areas.

[0014] Compared with the prior art, the beneficial effects of this utility model are: it provides an adjustable retaining wall suitable for pile foundation construction in soft soil and other challenging terrain. 1. Through the linkage structure of support column, contact plate, functional ring and extrusion block, dynamic adaptive support for the casing is achieved: the arc-shaped contact plate is directly attached to the outer wall of the casing and is fixed to the upper end of the support column. When the soft soil is laterally squeezed or the borehole diameter is reduced due to construction disturbance, the right-angled trapezoidal extrusion block can squeeze the support column through the inclined surface and push the contact plate to press tightly towards the casing. At the same time, the lower end of the casing goes deep into the hole of the pile foundation. With the circumferential support of the casing by the contact plate, it can effectively fill the gap caused by the deformation of the soft soil, avoid the problem of "stress concentration cracking" or "support failure" caused by the fixed size of traditional rigid casing, and ensure that the casing is always tightly attached to the borehole wall to protect the borehole wall from collapse. 2. By using a synchronous adjustment structure of the rotating ring, the extrusion plate, and the push bolt, a uniform distribution of circumferential support force is achieved: When the push bolt on the mounting plate is rotated, the push bolt can push the extrusion plate on the outside of the rotating ring, causing the rotating ring to rotate as a whole. When the rotating ring rotates, the functional ring connected to its upper end through the mounting frame rotates synchronously, so that the extrusion block on the inside of the functional ring evenly extrudes all the support columns, thereby allowing the contact plate to apply a uniform circumferential support force to the casing, avoiding the force imbalance caused by the traditional "single-group independent adjustment", and solving the problem of pile body deviation in soft soil areas from the root. 3. The inclined anchoring design of the sleeve, anchor rod, and limiting rod significantly improves the reliability of the anchoring: the sleeve and anchor rod are inclined, and the lower end of the anchor rod faces downward towards the outside of the contact plate. This angle design can maximize the use of the friction resistance of soft soil. Compared with traditional vertical or fixed angle anchor rods, the pull-out bearing capacity is significantly improved. At the same time, the L-shaped limiting rod passes through the sleeve and anchor rod and engages with them, which can lock the anchoring position of the anchor rod, avoid the anchor rod loosening caused by soft soil creep, ensure that the entire retaining wall does not sink, and form a continuous and reliable support system. 4. When adjusting the support force by adjusting the push bolt, the rotation of the swivel ring will simultaneously drive the inner limit rod to make a fine adjustment, further compacting the engagement state between the anchor rod and the sleeve. Unlike traditional technology, it does not require "adjusting the support first and then locking the anchor separately". In addition, the mounting frame is fixed to the swivel ring by the locking bolt, and the functional ring can be quickly disassembled or replaced. It is compatible with casings of different diameters, has strong versatility, and greatly reduces the operational complexity of pile foundation construction in soft soil areas, thus improving construction efficiency. 5. Since the lower end of the casing extends deep into the pile hole and forms a stable support through the contact plate and support column, it can avoid the problems of "difficult to sink and easy to disturb the surrounding soil" of traditional steel casings. At the same time, the uniform support force and reliable anchoring can reduce the additional compression of the soft soil around the pile by the casing, protect the structural integrity of the soil around the pile, and thus ensure the bearing capacity after the subsequent concrete pouring of the pile body, and reduce safety risks such as foundation pit leakage and ground collapse. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the connection between the contact plate and the anchor rod of this utility model; Figure 3 This is a schematic diagram of the overall cross-sectional three-dimensional structure of this utility model; Figure 4 This is a three-dimensional structural diagram of the cross-sectional view of the contact plate, anchor rod, and swivel ring connection of this utility model; Figure 5 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the sleeve and the limiting rod of this utility model; Figure 6 This is a three-dimensional structural diagram of the present invention in its overall disassembled state.

[0016] In the diagram: 1. Contact plate; 2. Support column; 3. Contact plate; 4. Sleeve; 5. Anchor rod; 6. Rotary ring; 7. Limiting rod; 8. Mounting bracket; 9. Functional ring; 10. Extrusion block; 11. Locking bolt; 12. Extrusion plate; 13. Mounting plate; 14. Push bolt; 15. Relief groove; 16. Casing. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-6 This utility model provides a technical solution: an adjustable retaining wall for pile foundation construction in soft soil and poor terrain.

[0019] Example 1: This example discloses: a contact plate 1, a rotating support column 2 mounted on the upper surface of the contact plate 1, and a contact plate 3 fixedly mounted on the upper end of the support column 2, a sleeve 4 fixedly mounted on the upper surface of the contact plate 1, and an anchor rod 5 inserted into the inner side of the sleeve 4, a rotating ring 6 mounted on the upper surface of the contact plate 1, and a limit rod 7 connected to the inner surface of the ring 6, a mounting frame 8 mounted on the upper surface of the ring 6, and a functional ring 9 fixedly connected to the upper end of the mounting frame 8, and a pressing block 10 fixedly mounted on the inner surface of the functional ring 9, the mounting frame 8 being fixedly mounted to the ring 6 by locking bolts 11, and a protective sleeve 16 being provided on the inner side of the contact plate 3; The support columns 2 are set at equal angles on the upper surface of the contact plate 1, and a spring connects the support columns 2 and the contact plate 1. The contact plate 3 has an arc-shaped design. The sleeve 4 and the anchor rod 5 are inclined, and the lower end of the anchor rod 5 is set downward toward the outside of the contact plate 1; The limiting rod 7 is designed in an L-shape, and one end of the limiting rod 7 passes through the sleeve 4 and the anchor rod 5. The end of the limiting rod 7 that passes through the sleeve 4 and the anchor rod 5 is engaged with the sleeve 4 and the anchor rod 5. The extrusion block 10 is designed as a right-angled trapezoid, and the inclined surface of the extrusion block 10 faces the support column 2. The extrusion block 10 and the support column 2 are designed to correspond one-to-one. First, the contact plate 1 is placed in the preset position for pile foundation construction in the soft soil poor area, serving as the basic bearing component of the entire retaining wall structure. The anchor rod 5 is inserted along the inclined sleeve 4, so that the lower end of the anchor rod 5 is driven into the soft soil with the outside of the contact plate 1. The inclined angle is used to maximize the frictional resistance of the soft soil on the anchor rod 5, and the overall anchoring of the retaining wall is initially achieved. The rotating ring 6 is rotated so that one end of the L-shaped limiting rod 7 passes through the sleeve 4 and the anchor rod 5. The anchoring position of the anchor rod 5 is locked by the snap-fit ​​connection to prevent the anchor rod 5 from loosening due to the creep of the soft soil. The mounting bracket 8 is fixed to the upper surface of the rotating ring 6 using locking bolts 11. Since the functional ring 9 is fixedly connected to the upper end of the mounting bracket 8, the functional ring 9 and the rotating ring 6 form a synchronous linkage structure. The extrusion block 10 fixed inside the functional ring 9 is a right-angled trapezoidal design with its inclined surface facing the support column 2. During rotation, the inclined surface of the extrusion block 10 will generate lateral extrusion force on the support column 2. Under the action of extrusion force, the support column 2 overcomes the spring force and moves towards the casing 16, causing the contact plate 3 to adhere to the outer wall of the casing 16 and support and position the casing 16. When the soft soil is subjected to lateral extrusion or the hole wall diameter is reduced due to construction disturbance, the casing 16 will tend to shift or deform under the pressure of the soil. At this time, the casing 16 plays a supporting role. The lower end of the casing 16 extends into the pile hole. With the circumferential clamping force of the contact plate 3, the casing 16 is always in close contact with the hole wall to prevent the hole wall from collapsing or the casing 16 from shifting. At the same time, the limiting rod 7 is finely adjusted with the rotating ring 6 to further compact the engagement state of the sleeve 4 and the anchor rod 5, enhance the anchoring stability, and prevent the contact plate 1 from sinking.

[0020] Example 2: This example discloses the following based on Example 1: An extrusion plate 12 is fixedly provided on the outer surface of the rotating ring 6, and an installation plate 13 is fixedly provided on the outer surface of the contact plate 1 directly opposite the extrusion plate 12, and a push bolt 14 is threadedly connected to the upper surface of the installation plate 13. After the positioning of the contact plate 1, the inclined anchoring of the anchor rod 5, the assembly of the mounting frame 8 and the functional ring 9, and the initial bonding of the protective sleeve 16 and the contact plate 3 are completed, the support force adjustment stage is entered. The mounting plate 13 is fixed on the outer surface of the contact plate 1 and is directly opposite the extrusion plate 12 on the outer side of the rotating ring 6. The push bolt 14 is threadedly connected to the upper surface of the mounting plate 13. When the push bolt 14 is rotated, the bolt rod can move axially along the thread direction and directly push the extrusion plate 12. After the extrusion plate 12 is pushed by the push bolt 14, it drives the rotating ring 6 to rotate as a whole along the upper surface of the contact plate 1. When the rotating ring 6 rotates, the functional ring 9 is driven to rotate synchronously through the mounting frame 8. The extrusion block 10 on the inner side of the functional ring 9 acts evenly on all the support columns 2 distributed at equal angles. Each support column 2 experiences the same compressive force, and after overcoming the spring force, it moves synchronously towards the casing 16, so that the contact plate 3 applies a uniform circumferential support force to the casing 16, avoiding the force imbalance of the casing 16 caused by the traditional "single-group independent adjustment", and solving the problem of pile body deviation in soft soil areas from the root. At the same time, the limiting rod 7 rotates and finely adjusts synchronously with the rotating ring 6, further strengthening the engagement between the anchor rod 5 and the sleeve 4. There is no need to operate the anchoring and locking steps separately, realizing the linkage of "support adjustment - anchoring reinforcement". Moreover, the lower end of the casing 16 is deeply inserted into the hole, avoiding the problems of difficult sinking and placement of traditional steel casing 16 and disturbing the soil around the pile during recovery.

[0021] Example 3: This example discloses, based on Example 1 and Example 2: The inner surface of the functional ring 9 is provided with a relief groove 15, and the relief groove 15 is U-shaped. The relief groove 15 is set in a one-to-one correspondence with the support column 2, and the groove width of the relief groove 15 is greater than the outer diameter of the support column 2. The clearance groove 15 is U-shaped and corresponds one-to-one with the support column 2. The groove width is greater than the outer diameter of the support column 2, so as to reserve space for the support column 2 to move and rotate. After completing the positioning of contact plate 1, anchoring of anchor rod 5, assembly of linkage structure of push bolt 14-extrusion plate 12-rotating ring 6, and fitting of protective sleeve 16 with contact plate 3, the dynamic adaptation stage begins. When push bolt 14 pushes extrusion plate 12, causing rotating ring 6 and functional ring 9 to rotate, extrusion block 10 on the inner side of functional ring 9 extrudes support column 2. Support column 2 needs to move towards protective sleeve 16. At the same time, due to the circumferential rotation of functional ring 9, there is a relative movement tendency between support column 2 and functional ring 9. The U-shaped structure of the clearance groove 15 can accommodate the radial movement of the support column 2 when it is not supported, and the groove width is greater than the outer diameter of the support column 2, so as to avoid the support column 2 from colliding or getting stuck with the inner wall of the functional ring 9 and ensure that the support column 2 moves smoothly. After the support column 2 moves smoothly, it moves the contact plate 3 away from the casing 16, making it easier to replace and disassemble the casing 16. If it is necessary to replace the casing 16 with a different diameter, the locking bolt 11 can be loosened to remove the mounting bracket 8 and the functional ring 9, and the functional ring 9 with the corresponding clearance groove 15 can be replaced to improve the versatility of the casing and reduce the complexity of construction.

[0022] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable retaining wall for pile foundation construction in soft soil areas, comprising a contact plate (1), wherein a rotating support column (2) is mounted on the upper surface of the contact plate (1), and a contact plate (3) is fixedly mounted on the upper end of the support column (2), characterized in that: A sleeve (4) is fixedly provided on the upper surface of the contact plate (1), and an anchor rod (5) is inserted into the inner side of the sleeve (4). A rotating ring (6) is installed on the upper surface of the contact plate (1), and a limit rod (7) is connected to the inner surface of the ring (6). A mounting bracket (8) is provided on the upper surface of the ring (6), and a functional ring (9) is fixedly connected to the upper end of the mounting bracket (8). An extrusion block (10) is fixedly provided on the inner surface of the functional ring (9). The mounting bracket (8) is fixedly installed to the ring (6) by a locking bolt (11). A protective sleeve (16) is provided on the inner side of the contact plate (3).

2. The adjustable retaining wall for pile foundation construction in soft soil areas according to claim 1, characterized in that: An extrusion plate (12) is fixedly provided on the outer surface of the rotating ring (6), and an installation plate (13) is fixedly provided on the outer surface of the contact plate (1) directly opposite the extrusion plate (12), and a push bolt (14) is threadedly connected to the upper surface of the installation plate (13).

3. The adjustable retaining wall for pile foundation construction in soft soil areas according to claim 1, characterized in that: The inner surface of the functional ring (9) is provided with a relief groove (15), and the relief groove (15) is U-shaped. The relief groove (15) and the support column (2) are set in a one-to-one correspondence. The groove width of the relief groove (15) is greater than the outer diameter of the support column (2).

4. The adjustable retaining wall for pile foundation construction in soft soil areas according to claim 1, characterized in that: The support column (2) is set at equal angles on the upper surface of the contact plate (1), and a spring is connected between the support column (2) and the contact plate (1). The contact plate (3) is arc-shaped.

5. An adjustable retaining wall for pile foundation construction in soft soil areas according to claim 1, characterized in that: The sleeve (4) and the anchor rod (5) are inclined, and the lower end of the anchor rod (5) is set downward toward the outside of the contact plate (1).

6. An adjustable retaining wall for pile foundation construction in soft soil areas according to claim 1, characterized in that: The limiting rod (7) is L-shaped, and one end of the limiting rod (7) passes through the sleeve (4) and the anchor rod (5), and the end of the limiting rod (7) that passes through the sleeve (4) and the anchor rod (5) is engaged with the sleeve (4) and the anchor rod (5).

7. An adjustable retaining wall for pile foundation construction in soft soil areas according to claim 1, characterized in that: The extrusion block (10) is designed as a right trapezoid, and the inclined surface of the extrusion block (10) is set towards the support column (2), and the extrusion block (10) and the support column (2) are designed to correspond one-to-one.

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