A soft soil foundation pit double-row pile composite benching supporting system and construction method

Abstract

The application relates to the technical field of foundation pit engineering, and discloses a soft soil foundation pit double-row-pile composite benching supporting system and a construction method, which comprises a first row of piles and a second row of piles, the first row of piles is arranged in parallel on one side of the second row of piles, a pressure roof beam is fixedly arranged on the upper side of the first row of piles and the second row of piles, a connecting shell is arranged on the upper side of the pressure roof beam, vertical plates are arranged on the inner sides of the connecting shell, a plurality of first sawtooth plates are fixedly arranged on the inner sides of the vertical plates, second sawtooth plates are fixedly arranged on the two sides of the pressure roof beam, the first sawtooth plates are connected with the corresponding second sawtooth plates, an adjusting mechanism for adjusting the positions of the vertical plates is arranged in the connecting shell, and a fixing shell is arranged between the two connecting shells. The soft soil foundation pit double-row-pile composite benching supporting system and method adopt a prefabricated connecting beam, can quickly combine the double-row piles, can greatly shorten the construction period, and can accelerate the engineering progress.

Description

Technical Field

[0001] This invention relates to the field of foundation pit engineering technology, specifically to a double-row pile composite slope protection system and construction method for soft soil foundation pits. Background Technology

[0002] When carrying out foundation pit excavation in soft soil areas, the characteristics of soft soil, such as high water content, low strength, high compressibility and high sensitivity, pose a great challenge to foundation pit support. Traditional foundation pit support methods, such as single-row pile support and soil nailing wall support, often fail to meet the stability requirements in soft soil foundation pits, and are prone to safety accidents such as foundation pit collapse and excessive deformation.

[0003] Double-row pile support, as a relatively effective support method, improves the stability of the support structure to a certain extent. However, the existing double-row pile support system has many shortcomings in the construction process. Usually, the connecting beam between the double rows of piles is cast in place, which requires the construction of a complex formwork support system, which consumes a lot of manpower, material resources and time. The construction cycle of the cast-in-place connecting beam is long and is greatly affected by natural factors such as weather. In addition, quality problems such as cracks and insufficient strength are prone to occur during the concrete pouring and curing process, which seriously affects the overall performance of the support system and the construction progress. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a composite slope protection system and construction method for soft soil foundation pits using double-row piles. This system features the advantages of using prefabricated connecting beams, enabling rapid assembly of the double-row piles, significantly shortening the construction cycle, and accelerating project progress, thus solving the problems mentioned in the background technology.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a double-row pile composite slope protection system and construction method for soft soil foundation pits, comprising a first row of piles and a second row of piles, wherein the first row of piles is arranged parallel to one side of the second row of piles, and a capping beam is fixedly installed on the upper side of both the first row of piles and the second row of piles, and a connecting shell is provided on the upper side of both capping beams, wherein vertical plates are provided on both sides of the interior of the connecting shell, and multiple first sawtooth plates are fixedly installed on the inner side of both vertical plates, and second sawtooth plates are fixedly installed on both sides of the capping beams, wherein the first sawtooth plates are engaged with the corresponding second sawtooth plates. The connecting shell has an adjustment mechanism inside for adjusting the position of the vertical plate. A fixed shell is provided between the two connecting shells. Slide plates are slidably provided on both sides of the fixed shell. Connecting rods are fixedly provided on opposite sides of the two slide plates. One end of each connecting rod extends to the outside of the fixed shell. The outer end of each connecting rod is fixedly connected to the corresponding connecting shell. A rotating rod is rotatably provided inside the fixed shell. The rod wall of the rotating rod is provided with a transmission mechanism to drive the two slide plates to move. A limiting mechanism is provided on the outer wall of the fixed shell to restrict the rotation of the rotating rod.

[0008] Preferably, the adjusting mechanism includes a first threaded rod and a bidirectional lead screw. The bidirectional lead screw is rotatably disposed on the upper side inside the fixed shell. Both ends of the bidirectional lead screw are threaded with sliders. A horizontal plate is fixedly disposed on the lower side of each slider. The first threaded rod is threaded inside the vertical plate. The upper end of the first threaded rod is rotatably connected to the horizontal plate. A fixing block is fixedly disposed on the side of the vertical plate away from the first serrated plate. A through hole is opened in the middle of the fixing block. A limit rod is slidably disposed inside the through hole. The upper end of the limit rod is fixedly connected to the horizontal plate.

[0009] Preferably, the transmission mechanism includes movable rings and round pins, a push rod is fixedly sleeved on the rod wall of the rotating rod, two movable rings are fixedly disposed on the side of the two sliding plates that are close to each other, two round pins are fixedly disposed at both ends of the push rod, and one end of each of the two push rods passes through the corresponding movable ring.

[0010] Preferably, the limiting mechanism includes a gear and an internal gear ring. One end of the rotating rod extends to the outside of the fixed shell. The gear is fixedly sleeved on the rod wall of the rotating rod. The internal gear ring is meshed on the outside of the gear. A threaded hole is opened on one side of the internal gear ring. A threaded rod is threaded inside the threaded hole. One end of the threaded rod is rotatably connected to the outer wall of the fixed shell.

[0011] Preferably, both the front and rear sides of the slider abut against the inner wall of the connecting shell.

[0012] Preferably, one end of the bidirectional lead screw extends to the outside of the connecting shell and is fixedly sleeved with a rotating wheel.

[0013] Preferably, a through groove is provided on the outer wall of the connecting shell at a position corresponding to the first threaded rod.

[0014] Preferably, a retaining ring is fixedly sleeved at the end of the pin away from the push rod.

[0015] Preferably, the internal toothed ring has a sliding hole on the side away from the second threaded rod, and a sliding rod is slidably fitted inside the sliding hole, with one end of the sliding rod fixedly connected to the outer wall of the fixed shell.

[0016] A construction method for a double-row pile composite slope protection system for soft soil foundation pits, comprising the double-row pile composite slope protection system for soft soil foundation pits, the specific steps of which are as follows:

[0017] Step 1: Install piles. Bury the first row of piles into the ground on the upper side of the slope and the second row of piles into the ground on the lower side of the slope. Install capping beams on top of the first and second rows of piles.

[0018] Step 2: Adjust the distance between the two connecting shells, rotate the second threaded rod to move the internal gear ring, causing the internal gear ring to separate from the gear, thus releasing the limit on the rotating rod. Then rotate the rotating rod to make the push rod rotate. The push rod drives the two round pins to rotate around the rotating rod as an axis, so that the two round pins push the corresponding movable ring to move, which in turn moves the two side slides. The slides drive the corresponding connecting rods to move, thus moving the two connecting shells. This allows the distance between the two connecting shells to be adjusted according to the distance between the two pressure beams.

[0019] Step 3: Install the connecting shells. Place the two connecting shells on the corresponding capping beams, then rotate the first threaded rod. The first threaded rod drives the vertical plate to move longitudinally, so that the protrusion of the first sawtooth plate aligns with the groove of the second sawtooth plate. Then rotate the double-acting screw, which drives the two sliders to move. The sliders drive the corresponding horizontal plate to move, and the horizontal plate drives the vertical plate to move, thus making the first sawtooth plate engage with the corresponding second sawtooth plate. This completes the installation of the two connecting shells, thereby achieving slope protection for the soft soil foundation pit.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, the present invention provides a composite slope protection system and construction method for double-row piles in soft soil foundation pits, which has the following beneficial effects:

[0022] 1. The double-row pile composite slope protection system and method for soft soil foundation pits involves rotating the second threaded rod, causing the internal gear ring to move and separate from the gear, thus releasing the limit on the rotating rod. Then, rotating the rotating rod causes the push rod to rotate, which in turn causes two round pins to rotate around the rotating rod as an axis. This causes the two round pins to push the corresponding movable rings to move, which in turn causes the sliding plates on both sides to move. The sliding plates then cause the corresponding connecting rods to move, thus moving the two connecting shells. This allows the spacing between the two connecting shells to be adjusted according to the spacing between the two pressure beams.

[0023] 2. The double-row pile composite slope protection system and method for soft soil foundation pits involves placing two connecting shells on corresponding capping beams, then rotating the first threaded rod, which drives the vertical plate to move longitudinally, aligning the protrusion of the first sawtooth plate with the groove of the second sawtooth plate. Then, rotating the double-sided screw rod drives two sliders to move, which in turn drives the corresponding horizontal plate to move, and the horizontal plate to move the vertical plate, thus engaging the first sawtooth plate with the corresponding second sawtooth plate. This completes the installation of the two connecting shells, thereby achieving slope protection for the soft soil foundation pit. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a double-row pile composite slope protection system and construction method for soft soil foundation pits proposed in this invention.

[0025] Figure 2 for Figure 1 Internal structure diagram;

[0026] Figure 3 for Figure 2 Enlarged view of part A of the structure;

[0027] Figure 4 for Figure 2 Enlarged view of Part B structure;

[0028] Figure 5 for Figure 1 Enlarged view of the C-section structure;

[0029] Figure 6 for Figure 3 A 3D view of the middle limit plate.

[0030] In the diagram: 1. First row of piles; 2. Second row of piles; 3. Fixed shell; 4. Connecting rod; 5. Connecting shell; 6. Two-way screw rod; 7. Slider; 8. Horizontal plate; 9. Fixed block; 10. Limiting rod; 11. First threaded rod; 12. First serrated plate; 13. Top beam; 14. Second threaded rod; 15. Second serrated plate; 16. Slide plate; 17. Movable ring; 18. Rotating rod; 19. Push rod; 20. Round pin; 21. Internal gear ring; 22. Gear; 23. Slide rod; 24. Vertical plate. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] Please see Figure 1-6 A composite slope protection system and construction method for double-row piles in soft soil foundation pits, comprising: 1. a first row of piles 1 and a second row of piles 2, the first row of piles 1 being arranged parallel to one side of the second row of piles 2, a capping beam 13 being fixedly installed on the upper side of both the first row of piles 1 and the second row of piles 2, a connecting shell 5 being covered on the upper side of both capping beams 13, vertical plates 24 being installed on both sides of the inside of the connecting shell 5, multiple first sawtooth plates 12 being fixedly installed on the inner side of both vertical plates 24, second sawtooth plates 15 being fixedly installed on both sides of the capping beam 13, the first sawtooth plates 12 being snapped into the corresponding second sawtooth plates 15, a fixing shell 3 being installed between the two connecting shells 5, sliding plates 16 being slidably installed on both sides of the inside of the fixing shell 3, connecting rods 4 being fixedly installed on the opposite sides of the two sliding plates 16, one end of each connecting rod 4 extending to the outside of the fixing shell 3, the outer end of each connecting rod 4 being fixedly connected to the corresponding connecting shell 5, and a rotating rod 18 being rotatably installed inside the fixing shell 3.

[0034] Example 2

[0035] Please see Figure 1-6 The connecting shell 5 is equipped with an adjustment mechanism for adjusting the position of the vertical plate 24. The adjustment mechanism includes a first threaded rod 11 and a double-acting screw 6. The double-acting screw 6 is rotatably mounted on the upper side inside the fixed shell 3. Both ends of the double-acting screw 6 are threaded with sliders 7. A horizontal plate 8 is fixedly mounted on the lower side of each slider 7. The first threaded rod 11 is threaded into the interior of the vertical plate 24. The upper end of the first threaded rod 11 is rotatably connected to the horizontal plate 8. A fixing block 9 is fixedly mounted on the side of the vertical plate 24 away from the first serrated plate 12. A through hole is provided in the middle of the fixed block 9. A limit rod 10 is slidably installed inside the through hole. The upper end of the limit rod 10 is fixedly connected to the horizontal plate 8. The front and rear sides of the slider 7 are in contact with the inner wall of the connecting shell 5, so that the slider 7 cannot rotate, that is, it can slide stably. One end of the bidirectional screw 6 extends to the outside of the connecting shell 5 and is fixedly sleeved with a rotating wheel to facilitate the rotation of the bidirectional screw. A through groove is provided on the outer wall of the connecting shell 5 at the position corresponding to the first threaded rod 11, so that a hand can be inserted into the connecting shell 5 to rotate the first threaded rod 11.

[0036] Example 3

[0037] Please see Figure 1-6 The rod wall of the rotating rod 18 is provided with a transmission mechanism that drives the two slide plates 16 to move. The transmission mechanism includes a movable ring 17 and a round pin 20. A push rod 19 is fixedly sleeved on the rod wall of the rotating rod 18. The two movable rings 17 are fixedly set on the side of the two slide plates 16 that are close to each other. The two round pins 20 are fixedly set on both ends of the push rod 19. One end of each push rod 19 passes through the corresponding movable ring 17. A retaining ring is fixedly sleeved on the end of the round pin 20 away from the push rod 19 to prevent the round pin 20 from slipping out of the movable ring 17 as much as possible.

[0038] Example 4

[0039] Please see Figure 1-6 The outer wall of the fixed shell 3 is provided with a limiting mechanism to restrict the rotation of the rotating rod 18. The limiting mechanism includes a gear 22 and an internal gear ring 21. One end of the rotating rod 18 extends to the outside of the fixed shell 3. The gear 22 is fixedly sleeved on the rod wall of the rotating rod 18. The internal gear ring 21 is meshed on the outside of the gear 22. A threaded hole is opened on one side of the internal gear ring 21. A threaded rod is threaded inside the threaded hole. One end of the threaded rod is rotatably connected to the outer wall of the fixed shell 3. A sliding hole is opened on the side of the internal gear ring 21 away from the second threaded rod 14. A sliding rod 23 is slidably sleeved inside the sliding hole. One end of the sliding rod 23 is fixedly connected to the outer wall of the fixed shell 3, so that the internal gear ring 21 cannot rotate, that is, it can slide stably.

[0040] A construction method for a double-row pile composite slope protection system for soft soil foundation pits, comprising the double-row pile composite slope protection system for soft soil foundation pits, the specific steps of which are as follows:

[0041] Step 1: Install piles. Bury the first pile 1 into the ground on the upper side of the slope and the second pile 2 into the ground on the lower side of the slope. Install the capping beam 13 on top of the first pile 1 and the second pile 2.

[0042] Step 2: Adjust the distance between the two connecting shells 5, rotate the second threaded rod 14 so that the second threaded rod 14 drives the internal gear ring 21 to move, so that the internal gear ring 21 separates from the gear 22, that is, release the limit on the rotating rod 18. Then rotate the rotating rod 18 so that the push rod 19 rotates. The push rod 19 drives the two round pins 20 to rotate around the rotating rod 18 as the axis, so that the two round pins 20 push the corresponding movable ring 17 to move, so that the two side slide plates 16 move. The slide plates 16 drive the corresponding connecting rod 4 to move, so that the two connecting shells 5 move, that is, the distance between the two connecting shells 5 can be adjusted according to the distance between the two side pressure beams 13.

[0043] Step 3: Install the connecting shells 5. Place the two connecting shells 5 on the corresponding capping beams 13. Then rotate the first threaded rod 11. The first threaded rod 11 drives the vertical plate 24 to move longitudinally, so that the protrusion of the first serrated plate 12 is aligned with the groove of the second serrated plate 15. Then rotate the double-acting screw 6. The double-acting screw 6 drives the two sliders 7 to move. The sliders 7 drive the corresponding horizontal plate 8 to move. The horizontal plate 8 drives the vertical plate 24 to move, so that the first serrated plate 12 is engaged with the corresponding second serrated plate 15. This completes the installation of the two connecting shells 5, thereby realizing the slope protection of the soft soil foundation pit.

[0044] It should be noted that the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] 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 double-row pile composite benching support system for a soft soil foundation pit, comprising a first row of piles (1) and a second row of piles (2), characterized in that: The first row of piles (1) is arranged in parallel on one side of the second row of piles (2), the upper sides of the first row of piles (1) and the second row of piles (2) are fixedly provided with a top pressing beam (13), the upper sides of the two sides of the top pressing beam (13) are covered with a connecting shell (5), the inside of the connecting shell (5) is provided with a vertical plate (24) on both sides, a plurality of first sawtooth plates (12) are fixedly arranged on the inside of the two vertical plates (24), the two sides of the top pressing beam (13) are fixedly provided with a second sawtooth plate (15), the first sawtooth plate (12) is clamped with the corresponding second sawtooth plate (15), the inside of the connecting shell (5) is provided with an adjusting mechanism for adjusting the position of the vertical plate (24), the two connecting shells (5) are provided with a fixed shell (3) between them, the inside of the fixed shell (3) is slidably provided with a sliding plate (16) on both sides, the side away from each other of the two sliding plates (16) is fixedly provided with a connecting rod (4), one end of the two connecting rods (4) extends to the outside of the fixed shell (3), the outside end of the two connecting rods (4) is fixedly connected with the corresponding connecting shell (5), the inside of the fixed shell (3) is rotatably provided with a rotating rod (18), the rod wall of the rotating rod (18) is provided with a transmission mechanism for driving the two sliding plates (16) to move, and the outer wall of the fixed shell (3) is provided with a limiting mechanism for limiting the rotation of the rotating rod (18).

2. The double-row pile composite benching support system for soft soil foundation pit according to claim 1, characterized in that: The adjusting mechanism comprises a first threaded rod (11) and a bidirectional screw rod (6), the bidirectional screw rod (6) is rotatably arranged on the inside of the upper side of the fixed shell (3), the two ends of the bidirectional screw rod (6) are threadedly sleeved with a sliding block (7), the lower side of the sliding block (7) is fixedly provided with a horizontal plate (8), the inside of the vertical plate (24) is threadedly sleeved with the first threaded rod (11), the upper end of the first threaded rod (11) is rotatably connected with the horizontal plate (8), the side away from the first sawtooth plate (12) of the vertical plate (24) is fixedly provided with a fixed block (9), the middle part of the fixed block (9) is provided with a through hole, the inside of the through hole is slidably provided with a limiting rod (10), and the upper end of the limiting rod (10) is fixedly connected with the horizontal plate (8).

3. The double-row pile composite benching support system for soft soil foundation pit according to claim 1, characterized in that: The transmission mechanism comprises a movable ring (17) and a round pin (20), the rod wall of the rotating rod (18) is fixedly sleeved with a push rod (19), the two movable rings (17) are fixedly arranged on the side close to the two sliding plates (16), the two round pins (20) are fixedly arranged on the two ends of the push rod (19), and one end of the two push rods (19) penetrates through the corresponding movable ring (17).

4. The double-row pile composite benching support system for soft soil foundation pit according to claim 1, characterized in that: The limiting mechanism comprises a gear (22) and an internal tooth ring (21), one end of the rotating rod (18) extends to the outside of the fixed shell (3), the gear (22) is fixedly sleeved on the rod wall of the rotating rod (18), the internal tooth ring (21) is meshingly arranged on the outside of the gear (22), one side of the internal tooth ring (21) is provided with a threaded hole, the inside of the threaded hole is threadedly sleeved with a threaded rod, and one end of the threaded rod is rotatably connected with the outer wall of the fixed shell (3).

5. The double-row pile composite benching support system for soft soil foundation pit according to claim 2, characterized in that: The front and back sides of the sliding block (7) are in contact with the inner wall of the connecting shell (5).

6. The double-row pile composite benching support system for soft soil foundation pit according to claim 2, characterized in that: One end of the bidirectional screw rod (6) extends to the outside of the connecting shell (5) and is fixedly sleeved with a rotating wheel.

7. The double-row pile composite benching support system for soft soil foundation pit according to claim 2, characterized in that: A through groove is formed in the outer wall of the connecting shell (5) and corresponds to the first threaded rod (11).

8. The double-row pile composite benching support system for soft soil foundation pit according to claim 3, characterized in that: A blocking ring is fixedly sleeved with the end of the round pin (20) away from the push rod (19).

9. The double-row pile composite benching support system for soft soil foundation pit according to claim 4, characterized in that: A sliding hole is formed in the side of the inner tooth ring (21) away from the second threaded rod (14), the sliding hole is slidably sleeved with a sliding rod (23), and one end of the sliding rod (23) is fixedly connected with the outer wall of the fixed shell (3).

10. A construction method of a soft soil foundation pit double-row pile composite benching support system, comprising the soft soil foundation pit double-row pile composite benching support system according to any one of claims 1-9, characterized in that: The specific steps are: Step one, install the piles, bury the first pile (1) in the ground on the upper side of the ramp, bury the second pile (2) in the ground on the lower side of the ramp, and install the pressure top beam (13) on the top of the first pile (1) and the second pile (2); Step two, adjust the distance between the two connecting shells (5), rotate the second threaded rod (14), so that the second threaded rod (14) drives the inner tooth ring (21) to move, so that the inner tooth ring (21) is separated from the gear (22), that is, the limiting of the rotating rod (18) is released, then the rotating rod (18) is rotated, the push rod (19) is rotated, the two round pins (20) are rotated around the rotating rod (18), that is, the two round pins (20) push the corresponding movable ring (17) to move, that is, the two side sliding plates (16) move, the corresponding connecting rod (4) moves, so that the two connecting shells (5) move, that is, the distance between the two connecting shells (5) can be adjusted according to the distance between the two pressure top beams (13); Step three, install the connecting shell (5), cover the two connecting shells (5) on the corresponding pressure top beam (13), then rotate the first threaded rod (11), the first threaded rod (11) drives the vertical plate (24) to move longitudinally, so that the protrusions of the first sawtooth plate (12) are aligned with the clamping grooves of the second sawtooth plate (15), then rotate the bidirectional screw rod (6), the bidirectional screw rod (6) drives the two sliding blocks (7) to move, the sliding blocks (7) drive the corresponding horizontal plates (8) to move, the horizontal plates (8) drive the vertical plates (24) to move, that is, the first sawtooth plate (12) is clamped with the corresponding second sawtooth plate (15), that is, the installation of the two connecting shells (5) is completed, and the soft soil foundation pit is realized.

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