Soft soil layer concrete support construction method

Abstract

The invention relates to the field of concrete support construction, in particular to a soft soil layer concrete support construction method which comprises the following steps: S1, precipitation construction; s2, carrying out fender post construction; s3, a foundation pit is excavated, and a waist beam is constructed; s4, concrete supports are constructed and connected with the waist beams; s5, reinforcing steel bars are bound, and a structural bottom plate, structural side walls and a structural middle plate are poured; s6, pouring a structural top plate, binding top plate steel bars, mechanically connecting reinforcing ribs arranged in the middle of the concrete support with the top plate steel bars through steel bar connectors reserved on the two sides of the concrete support in the binding process, and then pouring the structural top plate according to requirements; and S7, soil is backfilled above the structural top plate in a layered mode. The construction method has the effect of improving the construction efficiency.

Description

Technical Field

[0001] The present application relates to the field of concrete support construction, and in particular to a concrete support construction method for soft soil layers. Background Art

[0002] For the underground projects that are currently under extensive construction, foundation pit projects are the preferred spatial construction method for various underground buildings with large burial depths, large spaces, and special-shaped structures. In order to effectively deal with the adverse effects of foundation pit construction on the surrounding environment and ensure the safety of surrounding structures, concrete supports are usually used to support the upper part of the enclosing piles.

[0003] Conventional foundation pit support structure design, whether concrete or steel support, is considered as a temporary structure. When the foundation pit is excavated to the bottom and the main structure is rebuilt, it will be gradually dismantled. However, due to the large volume of concrete supports and the heavy mass of the cut concrete blocks, it is more troublesome to cut and hoist them, making on-site construction time-consuming and labor-intensive. Summary of the invention

[0004] In order to improve construction efficiency, the present application provides a soft soil layer concrete support construction method.

[0005] This application provides a soft soil layer concrete support construction method, which adopts the following technical solution: A soft soil layer concrete support construction method comprises the following steps: S1: Based on the underground structure outline, a dewatering well is set outside the foundation pit outline, and dewatering construction is carried out one month before the foundation pit excavation. S2: Lofting is carried out according to the retaining pile coordinates and construction errors, and then the retaining pile construction is carried out. The retaining pile construction is carried out in the order of drilling rig positioning, hole drilling, hole cleaning, steel cage installation, concrete pouring, and pile top slurry cleaning. S3: Excavation of the foundation pit is carried out. When the foundation pit is excavated to 0.5m below the concrete support, the waist beam is promptly constructed. The waist beam and the retaining pile are connected by embedded reinforcement. At the same time, the other side of the waist beam is reserved for load-bearing steel bars or embedded steel bar connectors; S4: According to the arrangement of concrete supports and the cross-sectional dimensions of the concrete supports, the soil in the foundation pit is excavated by grooving, then leveled, cushion layers are laid, and the concrete support steel skeleton is tied. The concrete support force bars are arranged, and reinforcing bars are set. The length of the reinforcing bars is perpendicular to the length direction of the concrete supports, and steel bar connectors are reserved at both ends of the reinforcing bars. The connection between the waist beam and the concrete support is made through the reserved force bars or embedded steel bar connectors set on the waist beam. S5: After the concrete support reaches the specified curing age and design strength, the foundation pit is continued to be excavated until the bottom of the foundation pit. Then the bottom of the pit is promptly leveled, a waterproof layer and a plain concrete cushion layer are laid, steel bars are tied, and the structural bottom plate, structural side wall and structural middle plate are cast. During the casting of the main structure, the internal supports at the corresponding positions are promptly removed. S6: Casting of the structural top slab. Roughen the surfaces on both sides of the concrete support, then apply 2-3 coats of interface agent, tie the top slab steel bars. During the tying process, mechanically connect the reinforcement bars set in the middle of the concrete support with the top slab steel bars through the steel bar connectors reserved on both sides of the concrete support, and then cast the structural top slab as required; S7: Backfill the soil in layers above the structural top slab.

[0006] Optionally, in step S6, a plurality of clamping grooves are provided on the upper surface of the top plate structure, and the plurality of clamping grooves respectively correspond to a plurality of concrete supports, and the concrete supports are clamped in the corresponding clamping grooves.

[0007] By adopting the above technical solution, the concrete support part is located in the clamping groove of the top plate, so that the concrete support and the top plate are partially connected, the concrete support and the top plate are integrated, and the connection strength between the concrete support and the top plate is improved.

[0008] Optionally, the concrete support is provided with a lifting mechanism, the top plate steel bars include a first top plate steel bar and a second top plate steel bar, the first top plate steel bar is located above the second top plate steel bar, the first top plate steel bar is used to connect with the reinforcing ribs, and the lifting mechanism is used to lift the second top plate steel bar.

[0009] By adopting the above technical scheme, the reinforcement ribs of the concrete support are used to connect with the first top plate steel bars, and then a lifting structure is further provided on the concrete support, and the lifting structure further connects the reinforcement ribs and the second top plate steel bars. The upper part of the lifting structure is connected to the reinforcement ribs, and then the lower part of the lifting structure holds the second top plate steel bars. After the top plate is cast, the connection strength between the concrete support and the top plate can be improved.

[0010] Optionally, the lifting mechanism includes a driving assembly and a lifting frame, the lifting frame is sleeved on the first reinforcing rib and the second top plate steel bar, and the driving assembly is used to drive the lifting frame to move upward.

[0011] By adopting the above technical solution, the upper part of the lifting frame is overlapped on the reinforcing ribs, and the lower part of the lifting frame hooks the second top plate steel bars. The driving assembly can drive the lifting frame to move upward, thereby pulling the second top plate steel bars to improve the connection strength between the concrete support and the top plate.

[0012] Optionally, the lifting frame includes a first limit frame, a second limit frame and a threaded sleeve, the first limit frame and the second limit frame are U-shaped, the first limit frame is hooked on two adjacent reinforcing ribs, the second limit frame is hooked on two adjacent second top plate steel bars, the first limit frame and the second limit frame are arranged relative to each other, both ends of the first limit frame and the second limit frame are provided with threaded portions, the threaded sleeve is arranged at one end where the first limit frame and the second limit frame are close to each other, and the threaded portions corresponding to the first limit frame and the second limit frame have opposite rotation directions.

[0013] By adopting the above technical solution, the first limit frame is overlapped on the reinforcing rib, and the second limit frame hooks the second top plate steel bar. Since the corresponding threaded parts of the first limit frame and the second limit frame have opposite rotation directions, when the driving assembly drives the threaded sleeve to rotate, the first limit frame and the second limit frame can be forced to move in a direction close to each other, thereby connecting the reinforcing rib and the second top plate steel bar to improve the connection strength between the concrete support and the top plate.

[0014] Optionally, the concrete support is provided with a lifting block, and the lifting block is slidably connected to the concrete support along the vertical direction, and two ends of the lifting block abut against the reinforcing ribs on both sides.

[0015] By adopting the above technical solution, since the first limit frame and the second limit frame will approach each other under the drive of the threaded sleeve, the reinforcing ribs are prone to bending, a lifting block is provided, and the reinforcing ribs on both sides can be supported by the lifting block, thereby reducing the possibility of bending of the reinforcing ribs and improving the connection strength of the connection point between the concrete support and the top plate structure.

[0016] Optionally, the driving assembly includes a first rack, a second rack, a first threaded rod and a first pull rope, the second rack is horizontally slidably connected to a concrete support, the axial direction of the first threaded rod is parallel to the sliding direction of the second rack, the first threaded rod is threadedly connected to the concrete support, one end of the first threaded rod is rotatably connected to the second rack, the first rack is located directly above the second rack, the tooth surfaces of the first rack and the second rack are opposite, the concrete support is provided with a blocking plate for blocking the first rack, the blocking direction of the blocking plate is parallel to the moving direction of the second rack, a plurality of first pull ropes are provided, and the plurality of first pull ropes respectively correspond to a plurality of threaded sleeves, one end of the first pull rope is connected to the threaded sleeve, and the other end of the first pull rope is connected to the jacking block.

[0017] By adopting the above technical solution, when it is necessary to connect the reinforcing ribs and the second top plate steel bars through the lifting frame, the first threaded rod is rotated to drive the second rack to move. Since the first rack and the second rack are meshed with each other, the second rack will drive the first rack to move during the sliding process, and the blocking piece blocks the first rack, so that the first rack moves upward and drives the lifting block to lift, thereby lifting the reinforcing ribs on both sides. During the lifting process, the lifting block will pull the first pull rope, and then pull the threaded sleeve to rotate, so that the first limit frame and the second limit frame move relative to each other, thereby connecting the reinforcing ribs and the second top plate steel bars.

[0018] Optionally, both ends of the second rack are fixedly connected with second pull ropes, and the second pull ropes are successively passed through the concrete support and connected to the second top plate steel bar on the other side.

[0019] By adopting the above technical solution, second pull ropes are provided at both ends of the second rack. When the second rack moves, the second pull ropes are pulled and tightened, thereby generating an upward pulling force on the first limit frame to hold the second top plate steel bars.

[0020] Optionally, a plurality of the lifting frames are provided, and the plurality of the lifting frames are distributed along the length direction of the reinforcing rib, and a synchronization member is provided between the plurality of the lifting frames, and the synchronization member is used for driving a plurality of threaded sleeves to rotate at the same time.

[0021] By adopting the above technical solution, several lifting frames are provided to further improve the connection strength between the reinforcing ribs and the second top plate steel bars, and synchronous parts are provided between the several lifting frames, which can drive several threaded sleeves to rotate through the synchronous parts to improve the convenience of operation.

[0022] Optionally, the synchronizing member is a third rack, the end of the first pull rope away from the jacking block is connected to the third rack, the outer peripheral wall of the threaded sleeve is provided with a plurality of transmission teeth, and the plurality of transmission teeth are distributed in a circular array around the axial direction of the threaded sleeve, the third rack is meshed with the transmission teeth, the end of the first pull rope away from the jacking block is connected to the third rack, an elastic rod is provided between the two third racks, and the elastic rod can force the two third racks to move in a direction away from each other, and the threaded sleeve is provided with a limiting ring for limiting the third rack, and the limiting ring is located below the third rack and abuts against the lower surface of the third rack.

[0023] By adopting the above technical solution, the third rack is engaged with several threaded sleeves at the same time. The third rack is driven to move by the first pull rope, which can drive several threaded sleeves to rotate, and an elastic rod is arranged between the two third racks. The elastic rod forces the third rack to move in the direction away from each other, so that the third rack can be engaged with the threaded sleeve. When the threaded sleeve rotates to a certain extent, it is difficult for the threaded sleeve to continue to rotate. At this time, since the third rack is engaged with the threaded sleeve, the third rack can play the role of a reinforcing beam to connect multiple lifting frames, thereby improving the connection strength between the multiple lifting frames.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The reinforcement of the concrete support is used to connect with the first top plate steel bar, and then a lifting structure is further provided on the concrete support, and the lifting structure further connects the reinforcement and the second top plate steel bar, the upper part of the lifting structure is connected with the reinforcement, and then the lower part of the lifting structure pulls the second top plate steel bar, and after the top plate is poured, the connection strength between the concrete support and the top plate can be improved; 2. The third rack is engaged with several threaded sleeves at the same time. The third rack is moved by the first pull rope, which can drive several threaded sleeves to rotate. An elastic rod is arranged between the two third racks. The elastic rod forces the third rack to move away from each other, so that the third rack can be engaged with the threaded sleeve. When the threaded sleeve rotates to a certain extent, it is difficult for the threaded sleeve to continue to rotate. At this time, since the third rack is engaged with the threaded sleeve, the third rack can play the role of a reinforcing beam to connect multiple lifting frames, thereby improving the connection strength between the multiple lifting frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of this embodiment; Figure 2 Schematic diagram of the connection between the concrete support and the top plate structure in this embodiment; Figure 3 Schematic diagram of the distribution of concrete supports and waist beams in this embodiment; Figure 4is a schematic diagram of the connection between the concrete support and the first top plate reinforcement in this embodiment; Figure 5 yes Figure 2 The enlarged schematic diagram of point A in the middle; Figure 6 yes Figure 4 The enlarged schematic diagram of point B in the middle; Figure 7 Schematic diagram of the structure of the lifting frame in this embodiment; Figure 8 Schematic diagram of the structure of the elastic rod in this embodiment.

[0026] Explanation of the reference numerals in the accompanying drawings: 1. guard pile; 11. waist beam; 2. concrete support; 21. reinforcement rib; 3. underground structure; 4. structural top plate; 41. first top plate steel bar; 42. second top plate steel bar; 43. clamping groove; 5. mounting block; 51. penetration groove; 52. lifting block; 521. lifting bar; 53. second pull rope; 6. pulling mechanism; 61. driving assembly; 611. first rack; 612. second rack; 613. first threaded rod; 614. first pull rope; 615. mounting frame; 616. blocking plate; 62. lifting frame; 621. first limit frame; 622. second limit frame; 623. threaded sleeve; 63. third rack; 64. elastic rod; 641. sliding tube; 642. telescopic rod; 643. spring; 7. backfill soil layer. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-8 This application is described in further detail.

[0028] The present application embodiment discloses a soft soil layer concrete support construction method, comprising the following steps: S1: Reference Figure 1 and Figure 2 Based on the 3 outlines of the underground structure, a dewatering well is set outside the foundation pit outline, and dewatering construction is carried out one month before the foundation pit excavation; S2: Refer to Figure 1 and Figure 2 , according to the coordinates of retaining pile 1 and the construction error, the retaining pile 1 is laid out, and then the retaining pile 1 is constructed in the order of drilling rig positioning, hole drilling, hole cleaning, lowering of steel cage, pouring of concrete, and cleaning of floating slurry on the pile top; S3: refer to Figure 1 and Figure 2 , excavate the foundation pit. When the foundation pit is excavated to 0.5m below the concrete support 2, the waist beam 11 is promptly constructed. The waist beam 11 is connected to the retaining pile 1 by planting steel bars. At the same time, the other side of the waist beam 11 is reserved with stress-bearing steel bars or embedded steel bar connectors; S4: Refer to Figure 2 and Figure 3According to the arrangement of concrete support 2 and the cross-sectional size of concrete support 2, the soil in the foundation pit is grooved and excavated, then leveled, a cushion layer is laid, and the steel skeleton of concrete support 2 is tied, the force-bearing bars of concrete support 2 are arranged, and reinforcing bars 21 are set. The length of reinforcing bars 21 is perpendicular to the length direction of concrete support 2, and steel bar connectors are reserved at both ends of reinforcing bars 21; the connection between waist beam 11 and concrete support 2 is connected by the reserved force-bearing steel bars or embedded steel bar connectors set on the waist beam 11, and the concrete support 2 and waist beam 11 are rigidly connected.

[0029] Reference Figure 3 and Figure 4 When tying the steel frame of the concrete support 2, the mounting block 5 is fixedly installed on the steel frame of the concrete support 2. There are several mounting blocks 5, and the several mounting blocks 5 are distributed along the length direction of the concrete support 2. The length direction of the mounting block 5 is parallel to the width direction of the concrete support 2.

[0030] Reference Figure 3 and Figure 4 The mounting block 5 has two first mounting holes, which are distributed along the length direction of the concrete support 2. The axis direction of the first mounting hole is parallel to the length direction of the mounting block 5. Each mounting block 5 is provided with two reinforcing ribs 21, which are fixedly mounted in the first mounting holes. S5: Reference Figure 1 and Figure 2 After the concrete support 2 reaches the specified curing age and design strength, continue to excavate the foundation pit until the bottom of the foundation pit, then promptly level the bottom of the pit, lay a waterproof layer and a plain concrete cushion layer. After that, tie the steel bars and cast the underground structure 3.

[0031] Reference Figure 1 and Figure 2 , the underground structure 3 is located inside the enclosed pile and below the concrete support 2. The underground structure 3 includes a structural top plate 4, a structural bottom plate, a structural side wall and a structural middle plate. In step S5, the structural top plate 4, the structural side wall and the structural middle plate are first cast, and the internal supports at the corresponding positions are removed in time during the casting of the main structure; S6: refer to Figure 2 , Figure 4 and Figure 5 , pouring the structural top plate 4, roughening the surfaces on both sides of the concrete support 2, then applying 2-3 coats of interface agent, tying the top plate steel bars, and in the tying process, mechanically connecting the reinforcing ribs 21 set in the middle of the concrete support 2 with the top plate steel bars through the steel bar connectors reserved on both sides of the concrete support 2; Reference Figure 2 , Figure 4 and Figure 5The top plate reinforcement includes a first top plate reinforcement 41 and a second top plate reinforcement 42. The first top plate reinforcement 41 is located above the second top plate reinforcement 42. In the drawings of this embodiment, the internal reinforcement of the top plate structure only shows the first top plate reinforcement 41 and the second top plate reinforcement 42. In the actual construction process, the top plate structure is also provided with other reinforcement skeletons. The upper surface of the top plate is provided with a plurality of clamping grooves 43. The plurality of clamping grooves 43 correspond to a plurality of concrete supports 2 respectively. The concrete supports 2 are partially located in the corresponding clamping grooves 43.

[0032] Reference Figure 3 and Figure 4 There are several first top plate steel bars 41, which are distributed along the length direction of the concrete support 2. The axial direction of the first top plate steel bars 41 is perpendicular to the length direction of the concrete support 2. Every two first top plate steel bars 41 correspond to one mounting block 5, and the first top plate steel bars 41 are connected to the reinforcing ribs 21 on the corresponding mounting block 5 through a steel bar connector.

[0033] Reference Figure 3 and Figure 4 The number of the second top plate steel bars 42 corresponds to the number of the first top plate steel bars 41 , the axial direction of the second top plate steel bars 42 is parallel to the axial direction of the first top plate steel bars 41 , and every two second top plate steel bars 42 correspond to one mounting block 5 .

[0034] Reference Figure 4 and Figure 6 Each mounting block 5 is provided with a lifting mechanism 6, which is used to lift the second top plate steel bar 42. The lifting mechanism 6 includes a driving component 61 and a plurality of lifting frames 62. The plurality of lifting frames 62 are respectively located on both sides of the mounting block 5. The lifting frames 62 are sleeved on the two reinforcing ribs 21 and the two second top plate steel bars 42 corresponding to the mounting block 5. The driving component 61 is used to drive the lower part of the lifting frame 62 to move upward to connect the reinforcing ribs 21 and the second top plate steel bars 42.

[0035] Reference Figure 4 and Figure 6 The lifting frame 62 includes a first limiting frame 621, a second limiting frame 622 and a threaded sleeve 623. The first limiting frame 621 and the second limiting frame 622 are in a U shape and are arranged opposite to each other. The opening of the first limiting frame 621 faces the second top plate steel bar 42, the first limiting frame 621 is hooked on two reinforcing ribs 21, the opening of the second limiting frame 622 faces the reinforcing rib 21, and the second limiting frame 622 is hooked on two second top plate steel bars 42.

[0036] Reference Figure 4 and Figure 6, both ends of the first limit frame 621 and the second limit frame 622 are provided with threaded portions, and two threaded sleeves 623 are provided, which are respectively located at the two ends of the first limit frame 621, and the threaded sleeve 623 is arranged at one end where the first limit frame 621 and the second limit frame 622 are close to each other. The threaded portions of one end of the first limit frame 621 and the second limit frame 622 corresponding to the same threaded sleeve 623 have opposite rotation directions. When the threaded sleeve 623 is rotated, the first limit frame 621 and the second limit frame 622 can be forced to move in a direction close to each other, and the driving assembly 61 is used to drive the threaded sleeve 623 to rotate.

[0037] Reference Figure 4 and Figure 6 The mounting block 5 is provided with a lifting block 52. A through slot 51 is provided through the mounting block 5. The length direction of the through slot 51 is parallel to the length direction of the mounting block 5. The through slot 51 is located below the first mounting hole. The lifting block 52 is slidably connected to the through slot 51 in the vertical direction. Both ends of the lifting block 52 abut against the reinforcing ribs 21 on both sides, and the driving assembly 61 can drive the lifting block 52 to lift upward. In the process of connecting the reinforcing ribs 21 and the second top plate steel bar 42, the lifting block 52 is installed in the through slot 51. The upper surfaces of both ends of the lifting block 52 are fixedly connected with lifting bars 521, so as to support the two reinforcing ribs 21 on the same side at the same time.

[0038] Reference Figure 4 and Figure 6 The driving assembly 61 includes a first rack 611, a second rack 612, a first threaded rod 613 and a first pull rope 614. The second rack 612 is horizontally slidably connected to the penetration groove 51. The axial direction of the first threaded rod 613 is parallel to the sliding direction of the second rack 612. One end of the first threaded rod 613 is rotatably connected to the second rack 612. The other end of the first threaded rod 613 is threadedly connected to a mounting bracket 615, and the mounting bracket 615 is fixedly connected to the groove wall of the penetration groove 51.

[0039] Reference Figure 4 and Figure 6 The first rack 611 is located directly above the second rack 612, the tooth surfaces of the first rack 611 and the second rack 612 are opposite, the first rack 611 is meshed with the second rack 612, and the upper surface of the first rack 611 abuts against the lower surface of the lifting block 52. The mounting block 5 is provided with a blocking piece 616 for blocking the first rack 611, the blocking piece 616 is fixedly connected to the groove wall of the penetration groove 51, the blocking piece 616 abuts against the side of the first rack 611 away from the first threaded rod 613, and the blocking direction of the blocking piece 616 is parallel to the moving direction of the second rack 612.

[0040] Reference Figure 4 and Figure 6, there are several first pull ropes 614, and the several first pull ropes 614 correspond to the several threaded sleeves 623 respectively. One end of the first pull rope 614 is fixedly connected to the threaded sleeve 623, and the other end of the first pull rope 614 is connected to the lifting block 52. After the reinforcing rib 21 and the first top plate steel bar 41 are connected, the first limit frame 621 and the second limit frame 622 are installed, and the first pull rope 614 is fixedly connected to the threaded sleeve 623, and then the first threaded rod 613 is rotated, and the first threaded rod 613 can force the second rack 612 to slide, so that the first rack 611 is lifted upward, driving the lifting block 52 to slide upward, and the lifting bar can support the reinforcing rib 21, and drive the threaded sleeve 623 to rotate, so as to connect the reinforcing rib 21 and the second top plate steel bar 42. After the steel bars are tied and connected, the top plate structure is poured.

[0041] Reference Figure 4 and Figure 6 The second pull rope 53 is fixedly connected to both ends of the second rack 612. The second pull rope 53 is made of steel strands. One end of the second pull rope 53 is fixedly connected to the side of the second rack 612. The other end of the second pull rope 53 is passed through the upper part of the mounting block 5 and fixedly connected to the second top plate steel bar 42 on the other side. The second pull rope 53 is passed through the jacking block 52. The jacking block 52 is provided with an avoidance hole for avoiding the second pull rope 53. The diameter of the avoidance hole is slightly larger than the diameter of the second pull rope 53.

[0042] Reference Figure 4 and Figure 6 The number of the lifting frames 62 on both sides of the mounting block 5 is greater than or equal to two, and the plurality of lifting frames 62 are distributed along the length direction of the reinforcing rib 21. A synchronous member is arranged between the plurality of lifting frames 62 on the same side. Two synchronous members are arranged, and the two synchronous members are distributed along the length direction of the concrete support 2. The synchronous members are used to drive the plurality of threaded sleeves 623 to rotate at the same time.

[0043] Reference Figure 4 and Figure 7 The synchronizer is a third rack 63, the length direction of the third rack 63 is parallel to the length direction of the reinforcing rib 21, the outer peripheral wall of the threaded sleeve 623 is provided with a plurality of transmission teeth, the plurality of transmission teeth are distributed in a circumferential array around the axis direction of the threaded sleeve 623, and the third rack 63 is meshed with the transmission teeth. An elastic rod 64 is provided between the two third racks 63, and the elastic rod 64 can force the two third racks 63 to move away from each other.

[0044] Reference Figure 7 and Figure 8The elastic rod 64 includes a sliding tube 641, a telescopic rod 642 and a spring 643. The sliding tube 641 has a sliding cavity. The telescopic rod 642 is slidably connected to the sliding cavity along the axial direction of the sliding tube 641. The spring 643 is located in the sliding cavity. One end of the spring 643 is fixedly connected to the bottom wall of the sliding cavity, and the other end of the spring 643 is fixedly connected to the telescopic rod 642. One end of the sliding tube 641 is fixedly connected to the third rack 63, and the end of the telescopic rod 642 away from the sliding tube 641 is fixedly connected to another third rack 63.

[0045] Reference Figure 7 The lower end of the threaded sleeve 623 is fixedly connected with a limiting ring for limiting the third rack 63. The limiting ring is located below the third rack 63 and abuts against the lower surface of the third rack 63. S7: Refer to Figure 1 , backfill soil above the structure top plate 4 to form a backfill soil layer 7.

[0046] The implementation principle of the construction method of a soft soil layer concrete support 2 in an embodiment of the present application is: during the pouring of the underground structure 3, the concrete support 2 is combined with the top plate structure in the underground structure 3, so that there is no need for subsequent dismantling of the concrete support 2, thereby improving construction efficiency.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A soft soil layer concrete support construction method, characterized in that: The method comprises the following steps: S1: based on the outline of the underground structure (3), a dewatering well is set outside the foundation pit outline, and dewatering construction is carried out one month before the foundation pit is excavated; S2: based on the coordinates of the retaining piles (1) and the construction error, the retaining piles (1) are laid out, and the retaining piles (1) are constructed in the order of positioning the drilling rig, drilling, cleaning the hole, lowering the steel cage, pouring concrete, and cleaning the floating slurry on the pile top; S3: excavating the foundation pit, and after the foundation pit is excavated to 0 below the concrete support (2), the retaining piles (1) are constructed. .5m, promptly construct the waist beam (11), connect the waist beam (11) and the retaining pile (1) by planting steel bars, and reserve stress-bearing steel bars or embedded steel bar connectors on the other side of the waist beam (11); S4: according to the arrangement of the concrete support (2) and the cross-sectional size of the concrete support (2), groove excavate the soil in the foundation pit, then level it, lay the cushion layer, tie the steel bar skeleton of the concrete support (2), arrange the stress-bearing bars of the concrete support (2), set the reinforcing bars (21), and the reinforcing bars (21) ) is perpendicular to the length direction of the concrete support (2), and steel bar connectors are reserved at both ends of the reinforcing bar (21); the connection between the waist beam (11) and the concrete support (2) is connected by the reserved stress-bearing steel bars or embedded steel bar connectors arranged on the waist beam (11); S5: After the concrete support (2) reaches the specified curing age and design strength, continue to excavate the foundation pit until the bottom of the foundation pit, then promptly level the pit bottom, lay a waterproof layer and a plain concrete cushion layer, tie the steel bars and cast the structural bottom plate, structural side wall and structural middle plate, and promptly remove the internal support at the corresponding position during the casting of the main structure; S6: Cast the structural top plate (4), roughen the surface of both sides of the concrete support (2), then apply 2-3 times of interface agent, tie the top plate steel bars, and during the tying process, mechanically connect the reinforcing bars (21) set in the middle of the concrete support (2) with the top plate steel bars through the steel bar connectors reserved on both sides of the concrete support (2), and then cast the structural top plate (4) as required; S7: Backfill soil in layers above the structural top plate (4).

2. A soft soil layer concrete support construction method according to claim 1, characterized in that: In step S6, a plurality of clamping grooves (43) are provided on the upper surface of the top plate structure (4), and the plurality of clamping grooves (43) respectively correspond to a plurality of concrete supports (2), and the concrete supports (2) are clamped in the corresponding clamping grooves (43).

3. A soft soil layer concrete support construction method according to claim 1, characterized in that: The concrete support (2) is provided with a lifting mechanism (6), the top plate steel bars include a first top plate steel bar (41) and a second top plate steel bar (42), the first top plate steel bar (41) is located above the second top plate steel bar (42), the first top plate steel bar (41) is used to connect to the reinforcing bar (21), and the lifting mechanism (6) is used to lift the second top plate steel bar (42).

4. A soft soil layer concrete support construction method according to claim 3, characterized in that: The lifting mechanism (6) comprises a driving assembly (61) and a lifting frame (62); the lifting frame (62) is sleeved on the first reinforcing rib (21) and the second top plate steel bar (42); the driving assembly (61) is used to drive the lifting frame (62) to move upward.

5. A soft soil layer concrete support construction method according to claim 4, characterized in that: The lifting frame (62) comprises a first limit frame (621), a second limit frame (622) and a threaded sleeve (623); the first limit frame (621) and the second limit frame (622) are U-shaped; the first limit frame (621) is hooked on two adjacent reinforcing ribs (21); the second limit frame (622) is hooked on two adjacent second top plate steel bars (42); the first limit frame (621) and the second limit frame (622) are arranged opposite to each other; both ends of the first limit frame (621) and the second limit frame (622) are provided with threaded portions; the threaded sleeve (623) is arranged at one end where the first limit frame (621) and the second limit frame (622) are close to each other; the threaded portions corresponding to the first limit frame (621) and the second limit frame (622) have opposite rotation directions.

6. A soft soil layer concrete support construction method according to claim 5, characterized in that: The concrete support (2) is provided with a lifting block (52), the lifting block (52) is slidably connected to the concrete support (2) in a vertical direction, the two ends of the lifting block (52) abut against the reinforcing ribs (21) on both sides, and the driving assembly (61) can drive the lifting block (52) to lift upward.

7. A soft soil layer concrete support construction method according to claim 6, characterized in that: The driving assembly (61) comprises a first rack (611), a second rack (612), a first threaded rod (613) and a first pull rope (614); the second rack (612) is horizontally slidably connected to the concrete support (2); the axial direction of the first threaded rod (613) is parallel to the sliding direction of the second rack (612); the first threaded rod (613) is threadedly connected to the concrete support (2); one end of the first threaded rod (613) is rotatably connected to the second rack (612); the first rack (611) is located directly above the second rack (612); The tooth surfaces of a rack (611) and a second rack (612) are opposite to each other, the concrete support (2) is provided with a blocking plate (616) for blocking the first rack (611), the blocking direction of the blocking plate (616) is parallel to the moving direction of the second rack (612), a plurality of first pull ropes (614) are provided, the plurality of first pull ropes (614) respectively correspond to a plurality of threaded sleeves (623), one end of the first pull rope (614) is connected to the threaded sleeve (623), and the other end of the first pull rope (614) is connected to the lifting block (52).

8. A soft soil layer concrete support construction method according to claim 7, characterized in that: Both ends of the second rack (612) are fixedly connected to second pull ropes (53), and the second pull ropes (53) are sequentially passed through the concrete support (2) and connected to the second top plate steel bar (42) on the other side.

9. A soft soil layer concrete support construction method according to claim 7, characterized in that: A plurality of the lifting frames (62) are provided, and the plurality of the lifting frames (62) are distributed along the length direction of the reinforcing rib (21). Synchronous components are provided between the plurality of the lifting frames (62), and the synchronous components are used to simultaneously drive a plurality of threaded sleeves (623) to rotate.

10. A soft soil layer concrete support construction method according to claim 9, characterized in that: The synchronous component is a third rack (63), one end of the first pull rope (614) away from the jacking block (52) is connected to the third rack (63), the outer peripheral wall of the threaded sleeve (623) is provided with a plurality of transmission teeth, and the plurality of transmission teeth are distributed in a circular array around the axial direction of the threaded sleeve (623), the third rack (63) is meshed with the transmission teeth, an elastic rod (64) is provided between the two third racks (63), and the elastic rod (64) can force the two third racks (63) to move in a direction away from each other, and the threaded sleeve (623) is provided with a limiting ring for limiting the third rack (63), and the limiting ring is located below the third rack (63) and abuts against the lower surface of the third rack (63).

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