Soft soil foundation pit double-row pile composite sloping supporting system and construction method

Abstract

The invention relates to the technical field of foundation pit engineering, and discloses a soft soil foundation pit double-row pile composite sloping support system and a construction method.The soft soil foundation pit double-row pile composite sloping support system comprises a first row of piles and a second row of piles, the first row of piles are arranged on one side of the second row of piles in parallel, and capping beams are fixedly arranged on the upper sides of the first row of piles and the second row of piles correspondingly; connecting shells cover the upper sides of the coping beams on the two sides, vertical plates are arranged on the two sides of the interior of each connecting shell, a plurality of first sawtooth plates are fixedly arranged on the inner sides of the two vertical plates, second sawtooth plates are fixedly arranged on the two sides of each coping beam, and the first sawtooth plates are connected with the corresponding second sawtooth plates in a clamped mode; adjusting mechanisms for adjusting the positions of the vertical plates are arranged in the connecting shells, and a fixing shell is arranged between the two connecting shells. According to the soft soil foundation pit double-row pile composite sloping supporting system and method, the prefabricated connecting beams are adopted, the double-row piles can be rapidly combined, the construction period can be greatly shortened, and the project progress can be greatly accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit engineering, and in particular to a double-row pile composite slope support system for a soft soil foundation pit and a construction method. Background Art

[0002] When excavating foundation pits in soft soil areas, the foundation pit support faces huge challenges due to the characteristics of soft soil such as high water content, low strength, high compressibility and high sensitivity. Traditional foundation pit support methods such as single-row pile support and soil nail wall support are often difficult to meet the stability requirements in soft soil foundation pits, and safety accidents such as foundation pit collapse and excessive deformation are prone to occur.

[0003] As a relatively effective support form, double-row pile support has improved the stability of the support structure to a certain extent. However, the existing double-row pile support system has many shortcomings during the construction process. Usually, the connecting beams between the double-row piles are cast on site, which requires the construction of a complex formwork support system, consuming a lot of manpower, material resources and time. The construction period of the connecting beams cast on site 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 maintenance process, which seriously affect the overall performance and construction progress of the support system. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a soft soil foundation pit double-row pile composite slope support system and construction method, which has the advantages of using prefabricated connecting beams, being able to quickly combine double rows of piles, greatly shortening the construction period, and accelerating the progress of the project, thereby solving the problems raised in the background technology.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a double-row pile composite slope support system and construction method for a soft soil foundation pit, comprising a first row of piles and a second row of piles, the first row of piles being arranged in parallel on one side of the second row of piles, a top pressure beam being fixedly arranged on the upper side of the first row of piles and the second row of piles, a connecting shell being provided on the upper side of the top pressure beams on both sides, vertical plates being arranged on both sides of the interior of the connecting shell, a plurality of first serrated plates being fixedly arranged on the inner sides of the two vertical plates, a second serrated plate being fixedly arranged on both sides of the top pressure beam, and the first serrated plate being clamped with the corresponding second serrated plate , an adjusting mechanism for adjusting the position of the vertical plate is arranged inside the connecting shell, a fixed shell is arranged between the two connecting shells, slides are slidably arranged on both sides of the interior of the fixed shell, connecting rods are fixedly arranged on the opposite sides of the two slides, one end of the two connecting rods extends to the outside of the fixed shell, and the outer ends of the two connecting rods are respectively fixedly connected to the corresponding connecting shells, a rotating rod is rotatably arranged inside the fixed shell, and a transmission mechanism for driving the two slides to move is arranged on the rod wall of the rotating rod, and a limiting mechanism for limiting the rotation of the rotating rod is arranged on the outer wall of the fixed shell.

[0008] Preferably, the adjusting mechanism includes a first threaded rod and a bidirectional screw rod, the bidirectional screw rod is rotatably arranged on the inner upper side of the fixed shell, both ends of the bidirectional screw rod are threadedly sleeved with sliders, the lower sides of the sliders are fixedly provided with a horizontal plate, the first threaded rod is threadedly sleeved inside the vertical plate, the upper end of the first threaded rod is rotatably connected to the horizontal plate, a fixing block is fixedly arranged 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 arranged inside the through hole, and the upper end of the limit rod is fixedly connected to the horizontal plate.

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

[0010] Preferably, the limiting mechanism includes a gear and an inner 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, and the inner gear ring is meshingly arranged on the outside of the gear, a threaded hole is opened on one side of the inner gear ring, a threaded rod is sleeved on the internal thread of the threaded hole, and 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 sliding block are in contact with the inner wall of the connecting shell.

[0012] Preferably, one end of the bidirectional screw rod 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, one end of the round pin away from the push rod is fixedly sleeved with a retaining ring.

[0015] Preferably, a sliding hole is formed on a side of the inner gear ring away from the second threaded rod, a sliding rod is provided inside the sliding hole, and one end of the sliding rod is fixedly connected to the outer wall of the fixed shell.

[0016] A construction method for a double-row pile composite slope support system for a soft soil foundation pit, comprising the double-row pile composite slope support system for a soft soil foundation pit, and the specific steps are as follows:

[0017] Step 1: Install the piles, bury the first row of piles in the ground on the upper side of the ramp, bury the second row of piles in the ground on the lower side of the ramp, and install a capping beam on the top of the first and second rows of piles;

[0018] Step 2: Adjust the spacing between the two connecting shells, rotate the second threaded rod, so that the second threaded rod drives the inner gear ring to move, so that the inner gear ring is separated from the gear, that is, release the limit on the rotating rod, and then rotate the rotating rod to rotate the push rod, and the push rod drives the two round pins to rotate with the rotating rod as the axis, that is, the two round pins push the corresponding movable ring to move, that is, the slide plates on both sides move, and the slide plates drive the corresponding connecting rods to move, so that the two connecting shells move, that is, the spacing between the two connecting shells can be adjusted according to the spacing between the top beams on both sides;

[0019] Step three, install the connecting shell, set the two connecting shell covers on the corresponding top pressure beam, and then rotate the first threaded rod, the first threaded rod drives the vertical plate to move longitudinally, so that the protrusion of the first serrated plate is aligned with the slot of the second serrated plate, and then rotate the bidirectional screw rod, the bidirectional screw rod drives the two sliders to move, the slider drives the corresponding cross plate to move, and the cross plate drives the vertical plate to move, so that the first serrated plate is clamped with the corresponding second serrated plate, and the installation of the two connecting shells is completed, thereby realizing the slope support of the soft soil foundation pit.

[0020] (III) Beneficial effects

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

[0022] 1. The double-row pile composite slope support system and method for a soft soil foundation pit, by rotating the second threaded rod, the second threaded rod drives the inner gear ring to move, so that the inner gear ring is separated from the gear, that is, the limit on the rotating rod is released, and then the rotating rod is rotated to rotate the push rod, and the push rod drives the two round pins to rotate with the rotating rod as the axis, that is, the two round pins push the corresponding movable rings to move, that is, the slide plates on both sides are moved, and the slide plates drive the corresponding connecting rods to move, so that the two connecting shells move, that is, the distance between the two connecting shells can be adjusted according to the distance between the top pressure beams on both sides.

[0023] 2. The double-row pile composite slope support system and method for the soft soil foundation pit is achieved by arranging two connecting shell covers on corresponding top pressure beams, and then rotating the first threaded rod, which drives the vertical plate to move longitudinally, so that the protrusion of the first serrated plate is aligned with the slot of the second serrated plate, and then rotating the bidirectional screw rod, which drives the two sliders to move, the slider drives the corresponding cross plate to move, and the cross plate drives the vertical plate to move, so that the first serrated plate is engaged with the corresponding second serrated plate, thereby completing the installation of the two connecting shells and realizing the slope support for the soft soil foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a double-row pile composite slope support system and a construction method for a soft soil foundation pit proposed by the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the internal structure;

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

[0027] Figure 4 for Figure 2 A magnified view of the structure of part B;

[0028] Figure 5 for Figure 1 A magnified view of the structure of part C;

[0029] Figure 6 for Figure 3 A three-dimensional view of the center limit plate.

[0030] In the figure: 1. first row of piles; 2. second row of piles; 3. fixed shell; 4. connecting rod; 5. connecting shell; 6. bidirectional screw rod; 7. sliding block; 8. horizontal plate; 9. fixing block; 10. limiting rod; 11. first threaded rod; 12. first serrated plate; 13. top beam; 14. second threaded rod; 15. second serrated plate; 16. sliding plate; 17. movable ring; 18. rotating rod; 19. pushing rod; 20. round pin; 21. inner gear ring; 22. gear; 23. sliding rod; 24. vertical plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] See also Figure 1-6 , a double-row pile composite slope support system for a soft soil foundation pit and a construction method, 1. It includes a first row of piles 1 and a second row of piles 2, the first row of piles 1 is arranged parallel to one side of the second row of piles 2, and a top beam 13 is fixedly arranged on the upper side of the first row of piles 1 and the second row of piles 2, and a connecting shell 5 is covered on the upper side of the top beams 13 on both sides, and vertical plates 24 are arranged on both sides of the interior of the connecting shell 5, and a plurality of first serrated plates 12 are fixedly arranged on the inner sides of the two vertical plates 24, and a second serrated plate 15 is fixedly arranged on both sides of the top beam 13, and the first serrated plates 12 are clamped with the corresponding second serrated plates 15, and a fixed shell 3 is arranged between the two connecting shells 5, and slide plates 16 are slidably arranged on both sides of the interior of the fixed shell 3, and connecting rods 4 are fixedly arranged on the opposite sides of the two slide plates 16, and one end of the two connecting rods 4 extends to the outside of the fixed shell 3, and the outer ends of the two connecting rods 4 are respectively fixedly connected to the corresponding connecting shells 5, and a rotating rod 18 is rotatably arranged inside the fixed shell 3.

[0034] Embodiment 2

[0035] See also Figure 1-6 The interior of the connecting shell 5 is provided with an adjusting mechanism for adjusting the position of the vertical plate 24, the adjusting mechanism includes a first threaded rod 11 and a bidirectional screw rod 6, the bidirectional screw rod 6 is rotatably arranged on the upper side of the interior of the fixed shell 3, both ends of the bidirectional screw rod 6 are threadedly sleeved with sliders 7, and the lower side of the slider 7 is fixedly provided with a horizontal plate 8, the first threaded rod 11 is threadedly sleeved inside the vertical plate 24, the upper end of the first threaded rod 11 is rotatably connected to the horizontal plate 8, and a fixed block 9 is fixedly arranged 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, and a limit rod 10 is slidingly arranged inside the through hole. The upper end of the limit rod 10 is fixedly connected to the cross plate 8. The front and rear sides of the slider 7 are in conflict 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 rod 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 rod. A through groove is provided on the outer wall of the connecting shell 5 and at a position corresponding to the first threaded rod 11, so that the hand can reach into the connecting shell 5 to rotate the first threaded rod 11.

[0036] Embodiment 3

[0037] See also Figure 1-6 The rod wall of the rotating rod 18 is provided with a transmission mechanism for driving the two slides 16 to move, and the transmission mechanism includes 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 slides 16. The two round pins 20 are fixedly arranged at both ends of the push rod 19. One end of the two push rods 19 passes through the corresponding movable ring 17. The end of the round pin 20 away from the push rod 19 is fixedly sleeved with a retaining ring to prevent the round pin 20 from slipping out of the movable ring 17 as much as possible.

[0038] Embodiment 4

[0039] See also Figure 1-6 The outer wall of the fixed shell 3 is provided with a limiting mechanism for limiting the rotation of the rotating rod 18, and the limiting mechanism includes a gear 22 and an inner gear ring 21. One end of the rotating rod 18 extends to the outside of the fixed shell 3, and the gear 22 is fixedly sleeved on the rod wall of the rotating rod 18. The inner gear ring 21 is meshed and arranged on the outside of the gear 22. A threaded hole is provided on one side of the inner gear ring 21, and a threaded rod is sleeved on the internal thread of 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 provided on the side of the inner gear ring 21 away from the second threaded rod 14, and 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 inner gear ring 21 cannot rotate, that is, it can slide stably.

[0040] A construction method for a double-row pile composite slope support system for a soft soil foundation pit, comprising the double-row pile composite slope support system for a soft soil foundation pit, and the specific steps are as follows:

[0041] Step 1: Install the piles, bury the first row of piles 1 in the ground on the upper side of the ramp, bury the second row of piles 2 in the ground on the lower side of the ramp, and install the capping beam 13 on the top of the first row of piles 1 and the second row of piles 2;

[0042] Step 2: Adjust the spacing between the two connecting shells 5. Rotate the second threaded rod 14 so that the second threaded rod 14 drives the inner gear ring 21 to move, so that the inner gear ring 21 is separated from the gear 22, that is, release the limit on the rotating rod 18, and then rotate the rotating rod 18 to rotate the push rod 19. The push rod 19 drives the two round pins 20 to rotate with 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 slide plates 16 on both sides move, and the slide plates 16 drive the corresponding connecting rods 4 to move, so that the two connecting shells 5 move, that is, the spacing between the two connecting shells 5 can be adjusted according to the spacing between the top beams 13 on both sides;

[0043] Step three, install the connecting shell 5, cover the two connecting shells 5 on the corresponding top pressure beam 13, and 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 slot of the second serrated plate 15, and then rotate the bidirectional screw rod 6, the bidirectional screw rod 6 drives the two sliders 7 to move, the slider 7 drives the corresponding cross plate 8 to move, and the cross 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, and the installation of the two connecting shells 5 is completed, thereby realizing the slope support of the soft soil foundation pit.

[0044] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-row pile composite slope 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 parallel to one side of the second row of piles (2); a top pressure beam (13) is fixedly arranged on the upper side of the first row of piles (1) and the second row of piles (2); a connecting shell (5) is provided on the upper side of the top pressure beams (13) on both sides; vertical plates (24) are arranged on both sides of the interior of the connecting shell (5); a plurality of first serrated plates (12) are fixedly arranged on the inner side of the two vertical plates (24); a second serrated plate (15) is fixedly arranged on both sides of the top pressure beam (13); the first serrated plate (12) is clamped with the corresponding second serrated plate (15); an adjusting mechanism for adjusting the position of the vertical plate (24) is arranged inside the connecting shell (5). A structure is provided, wherein a fixed shell (3) is arranged between the two connecting shells (5), slide plates (16) are slidably arranged on both sides of the interior of the fixed shell (3), connecting rods (4) are fixedly arranged on the opposite sides of the two slide plates (16), one end of the two connecting rods (4) extends to the outside of the fixed shell (3), and the outer ends of the two connecting rods (4) are respectively fixedly connected to the corresponding connecting shells (5), a rotating rod (18) is rotatably arranged inside the fixed shell (3), the rod wall of the rotating rod (18) is provided with a transmission mechanism for driving the two slide 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. A double-row pile composite slope support system for soft soil foundation pit according to claim 1, characterized in that: The adjustment mechanism comprises a first threaded rod (11) and a bidirectional screw rod (6), wherein the bidirectional screw rod (6) is rotatably arranged on the upper inner side of the fixed shell (3), both ends of the bidirectional screw rod (6) are threadedly sleeved with sliders (7), and a transverse plate (8) is fixedly arranged on the lower side of the slider (7), the first threaded rod (11) is threadedly sleeved inside the vertical plate (24), the upper end of the first threaded rod (11) is rotatably connected to the transverse plate (8), and a fixing block (9) is fixedly arranged on a side of the vertical plate (24) away from the first serrated plate (12), a through hole is opened in the middle of the fixing block (9), a limit rod (10) is slidably arranged inside the through hole, and the upper end of the limit rod (10) is fixedly connected to the transverse plate (8).

3. The double-row pile composite slope support system for soft soil foundation pit according to claim 1 is characterized by: The transmission mechanism comprises 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 arranged on the side close to the two slide plates (16); the two round pins (20) are fixedly arranged at the two ends of the push rod (19); one end of the two push rods (19) passes through the corresponding movable ring (17).

4. The double-row pile composite slope support system for soft soil foundation pit according to claim 1 is characterized by: The limiting mechanism comprises a gear (22) and an inner 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 inner gear ring (21) is meshedly arranged on the outside of the gear (22); a threaded hole is opened on one side of the inner gear ring (21); a threaded rod is sleeved on the inner thread of the threaded hole; one end of the threaded rod is rotatably connected to the outer wall of the fixed shell (3).

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

6. The double-row pile composite slope 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 slope support system for soft soil foundation pit according to claim 2, characterized in that: A through groove is provided on the outer wall of the connecting shell (5) at a position corresponding to the first threaded rod (11).

8. The double-row pile composite slope support system for soft soil foundation pit according to claim 3 is characterized by: One end of the round pin (20) away from the push rod (19) is fixedly sleeved with a retaining ring.

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

10. A construction method for a double-row pile composite slope support system for a soft soil foundation pit, comprising the double-row pile composite slope support system for a soft soil foundation pit according to any one of claims 1 to 9, characterized in that: The specific steps are: Step 1: Install the rows of piles, bury the first row of piles (1) in the ground on the upper side of the ramp, bury the second row of piles (2) in the ground on the lower side of the ramp, and install a capping beam (13) on the top of the first row of piles (1) and the second row of piles (2); 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 inner gear ring (21) to move, so that the inner gear ring (21) is separated from the gear (22), that is, release the limit of the rotating rod (18), and then rotate the rotating rod (18) to make the push rod (19) rotate, and the push rod (19) drives the two round pins (20) to rotate with 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 slide plates (16) on both sides move, and the slide plates (16) drive the corresponding connecting rods (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 top beams (13) on both sides; Step 3: Install the connecting shell (5), cover the two connecting shells (5) on the corresponding top pressure 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 protrusion of the first serrated plate (12) is aligned with the slot of the second serrated plate (15), and then rotate the bidirectional screw rod (6), the bidirectional screw rod (6) drives the two sliders (7) to move, the slider (7) drives the corresponding transverse plate (8) to move, and the transverse 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), and the installation of the two connecting shells (5) is completed, thereby realizing the slope support of the soft soil foundation pit.

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