A temporary support structure for foundation pit and a construction method thereof

Abstract

The application discloses a kind of temporary support replacement structure of foundation pit and its construction method, belong to building construction technical field, including multiple prefabricated support replacement plates being spaced apart between foundation pit bottom plate and foundation pit support structure, the contact surface of the foundation pit bottom plate, foundation pit support structure and prefabricated support replacement plate is all poured with cast-in-place band, the end face of the cast-in-place band towards prefabricated support replacement plate is all provided with several embedded parts;The side wall of the prefabricated support replacement plate towards cast-in-place band is all provided with recess, the recess is detachably connected with mounting piece, and the mounting piece is used for detachably connected with embedded part;Horizontal support frame is arranged between adjacent prefabricated support replacement plates;Its purpose is in the structure existing support replacement structure, construction procedure is more, long time, and cannot be reused, cost is higher, and when enclosure structure is higher, the problem that pouring cost is also higher.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a temporary support structure for foundation pits and its construction method. Background Technology

[0002] With the rapid development of urban construction, deep foundation pit projects are becoming increasingly common. In the construction of internally supported deep foundation pit projects, support removal is a widespread process. This involves using support replacement technology to address stability issues caused by the removal of internal supports, allowing the foundation pit support to re-establish equilibrium under new conditions.

[0003] Existing support structures are often constructed in situ, using the cast-in-place concrete structure as the force-transfer component. However, situ-cast support structures involve many construction procedures, long construction time, and cannot be reused, resulting in high costs. Furthermore, the cost of casting is even higher when the retaining structure is taller. Summary of the Invention

[0004] In view of this, the present invention discloses a temporary replacement support structure for foundation pit and its construction method. The purpose is to address the problems that existing replacement support structures have many construction procedures, long construction time, cannot be reused, have high costs, and have even higher pouring costs when the retaining structure is high.

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

[0006] A temporary replacement support structure for a foundation pit and its construction method are disclosed. The structure includes multiple precast replacement support plates spaced apart between the foundation pit bottom slab and the foundation pit support structure. Cast-in-place strips are poured on the contact surfaces of the foundation pit bottom slab, the foundation pit support structure, and the precast replacement support plates. Several embedded parts are provided on the end faces of the cast-in-place strips facing the precast replacement support plates. Grooves are formed on the sidewalls of the precast replacement support plates facing the cast-in-place strips, and mounting components are detachably connected to these grooves. The mounting components are used for detachable connection with the embedded parts. Horizontal support frames are provided between adjacent precast replacement support plates.

[0007] Before construction, the foundation pit bottom slab and the areas of the foundation pit support structure to be poured are cleaned and steel bars are tied. After the formwork is installed, the embedded parts are installed in sequence, and then the cast-in-place strip is poured. After the cast-in-place strip is cured, the installed parts are connected and fixed to the embedded parts, and then the precast replacement support plates are hoisted and the installed parts are connected and fixed to the grooves of the precast replacement support plates. Then, horizontal support frames are installed between adjacent precast replacement support plates to increase the lateral stiffness between the replacement support structures. The replacement support structure in this scheme consists of precast replacement support plates and cast-in-place strips. Only the cast-in-place strips need to be poured, without overall pouring, which can effectively lock in the construction time. In addition, the embedded replacement support plates and embedded parts in this scheme can be reused, which can effectively reduce costs. At the same time, when the retaining structure is high, only the height of the cast-in-place strip needs to be changed, which can also reduce costs.

[0008] Furthermore, the mounting component has a sliding member connected in parallel, and the mounting component is provided with a pin for limiting the sliding of the sliding member; the embedded component includes a main body with one end embedded in the cast-in-place strip, and a main rod that is hinged to the other end of the main body. An adjusting rod is slidably connected to the main rod, and the end of the adjusting rod is detachably connected to the corresponding sliding member; the main rod is provided with a limiting structure for limiting the sliding of the adjusting rod relative to the main rod.

[0009] In this scheme, after the precast replacement support plate is installed, the restriction structure on one side of the precast replacement support plate is released from the restriction of the adjusting rod, and the pin is removed. The corresponding moving part is then slid, and the moving part drives the corresponding adjusting rod to deflect and slide relative to the main rod, thereby significantly adjusting the orientation of the embedded part on that side, i.e., the force transmission direction of the embedded part. Compared with the traditional temporary replacement support structure, this scheme can adjust the force transmission direction of the replacement support structure according to the construction situation, and can play a better supporting role.

[0010] Furthermore, the limiting structure includes an annular block coaxially slidably connected to the main rod, and the main rod is provided with a pushing structure for pushing the annular block to slide; the main rod has several through holes arranged radially around its periphery, and each through hole is coaxially slidably connected with a limiting rod, and an elastic reset member is provided between the limiting rod and the through hole; the adjusting rod has several limiting holes that cooperate with the limiting rod, and one end face of the annular block is inclined.

[0011] When it is necessary to release the restriction of the limiting structure, simply push the structure to drive the ring block away from the limiting rod. Under the action of the elastic reset component, the limiting rod disengages from the limiting hole, allowing the adjusting rod to slide relative to the main rod. After the adjustment is completed, use the pushing structure to drive the ring block to reset. The ring block will then press the limiting rod into the limiting hole, thus completing the locking.

[0012] Furthermore, each groove is provided with a control shaft parallel to the moving part. Several sleeves are coaxially rotatably connected to the control shaft. Both ends of each sleeve are rotatably connected to ear plates that are fixedly connected to the moving part. Each sleeve is threaded with a connecting seat for detachable hinge connection to the end of the adjusting rod. The connecting seat is slidably connected to the moving part. Several positioning holes facing its axis are distributed circumferentially on the inner wall of the sleeve. Several cavities are provided inside the control shaft that are directly opposite the sleeve. Several sliding grooves are provided on the periphery of the cavity and arranged radially therein. A positioning rod slides elastically in the sliding groove. An electromagnet for attracting the positioning rod is provided in the cavity.

[0013] During subsequent construction, if local deformation of the post-cast strip necessitates local adjustment of the force transmission direction of some embedded parts, the electromagnets corresponding to the remaining embedded parts that do not require adjustment are energized. The electromagnets attract the corresponding positioning rods, causing them to disengage from the positioning holes. This separates the connection between the sleeves corresponding to the embedded parts that do not require adjustment and the control shaft, and removes the constraint of the restricting structure of the embedded parts that require adjustment. At this point, simply rotating the control shaft will cause the corresponding sleeves to rotate, thereby driving the connecting seat to slide, achieving the purpose of adjusting the force transmission direction of the local embedded parts. After the adjustment is completed, the constraint structure on the embedded parts is restored, and the remaining electromagnets are de-energized.

[0014] Furthermore, both ends of the sleeve are provided with several arc-shaped abutment grooves, and several abutment blocks that cooperate with the abutment grooves are elastically slidably provided on the ear plate, with the ends of the abutment blocks being arc-shaped.

[0015] Furthermore, the edge of the prefabricated support plate is provided with an elastic pad layer.

[0016] A construction method for a temporary support structure for foundation pits includes the following steps:

[0017] 1) Construction preparation: Clean the foundation pit bottom slab and the area where the foundation pit support structure needs to be poured and tie the reinforcing bars; after installing the formwork, install the embedded parts in sequence, and then pour the cast-in-place strip;

[0018] 2) Installation of precast replacement plates: After the cast-in-place strip has been cured, the installation parts and moving parts are removed from the precast replacement plates, and the end of the adjusting rod in the embedded part is hinged to the corresponding connecting seat on the moving part; the sliding of the adjusting rod relative to the main rod is restricted by the limiting structure; then the precast replacement plates are hoisted to ensure that the end face of the precast replacement plates is in contact with the cast-in-place strip, and the installation parts are fixed in the groove with bolts; then a horizontal support frame is installed between adjacent precast replacement plates.

[0019] 3) Overall Adjustment of the Replacement Support Structure: The limiting structure, control shaft, and moving parts on the horizontal side of the precast replacement support slab remain unchanged. Activate the pushing structure in the limiting structure on the vertical side of the precast replacement support slab. The pushing structure drives the annular block away from the limiting rod. Under the action of the elastic reset component, the limiting rod disengages from the limiting hole, allowing the adjusting rod to slide relative to the main rod. Then, remove the pin on the vertical side of the precast replacement support slab, slide the moving part, and significantly adjust the orientation of the embedded parts on the vertical side of the precast replacement support slab, thereby controlling the force transmission direction of the pit retaining structure to the vertical groove of the precast replacement support slab. After adjustment, reset the pin, and correspondingly, push the structure to reset the annular block. The annular block presses the limiting rod into the limiting hole, completing the locking. Then, keeping the limiting structure, control shaft, and moving parts on the vertical side of the precast replacement support slab unchanged, adjust the orientation of the embedded parts on the horizontal side of the precast replacement support slab in the same way, thereby controlling the force transmission direction of the horizontal groove of the precast replacement support slab to the pit bottom slab. Finally, dismantle the supports within the pit.

[0020] 4) Precise Control: During subsequent construction, if local deformation of the post-cast strip is required, and the force transmission direction of some embedded parts needs to be locally adjusted, the electromagnets opposite the other embedded parts that do not require adjustment are energized. The electromagnets attract the corresponding positioning rods, causing them to disengage from the positioning holes. This separates the connection between the sleeves corresponding to the embedded parts that do not require adjustment and the control shaft, and removes the constraint of the limiting structure of the embedded parts that require adjustment. At this point, simply rotating the control shaft will drive the corresponding sleeves to rotate, thereby driving the connecting seat to slide, achieving the purpose of adjusting the force transmission direction of the local embedded parts. After the adjustment is completed, the constraint structure on the embedded parts is restored, and the remaining electromagnets are de-energized.

[0021] 5) Recycling: After construction is completed, the installation parts and precast replacement plates are disassembled, the precast replacement plates are removed and recycled, the cast-in-place strip is removed, and the embedded parts are recycled.

[0022] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0023] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0025] Figure 2 This is a longitudinal sectional view of an embodiment of the present invention;

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0028] Figure 5 This is a cross-sectional view of the ear plate in an embodiment of the present invention.

[0029] The following are labeled in the attached diagram: 1. Pit bottom plate; 2. Pit support structure; 3. Cast-in-place strip; 4. Installation component; 5. Moving component; 6. Main body; 7. Main rod; 8. Adjusting rod; 9. Ring block; 10. Pushing structure; 11. Limiting rod; 12. Elastic reset component; 13. Control shaft; 14. Sleeve; 15. Ear plate; 16. Connecting seat; 17. Electromagnet; 18. Positioning rod; 19. Clamping block; 20. Horizontal support frame. Detailed Implementation

[0030] like Figures 1-5 As shown:

[0031] A temporary replacement support structure for a foundation pit includes multiple precast replacement support plates spaced apart between a foundation pit bottom slab 1 and a foundation pit support structure 2. Cast-in-place strips 3 are poured on the contact surfaces of the foundation pit bottom slab 1, the foundation pit support structure 2, and the precast replacement support plates. Several embedded parts are provided on the end faces of the cast-in-place strips 3 facing the precast replacement support plates. Grooves are formed on the sidewalls of the precast replacement support plates facing the cast-in-place strips 3, and mounting parts 4 are installed within these grooves. The mounting parts 4 are detachably connected to the precast replacement support plates via bolts, and are used for detachable connection with the embedded parts. Horizontal support frames 20 are detachably connected to adjacent precast replacement support plates via bolts.

[0032] Before construction, the areas to be poured for the foundation pit bottom slab 1 and foundation pit support structure 2 are cleaned and reinforced with steel bars. After installing the formwork, the embedded parts are installed sequentially, and then the cast-in-place strip 3 is poured. After the cast-in-place strip 3 has cured, the installation parts 4 are connected and fixed to the embedded parts, and then the precast replacement support plates are hoisted and the installation parts 4 are connected and fixed to the grooves of the precast replacement support plates. Then, horizontal support frames 20 are installed between adjacent precast replacement support plates to increase the lateral stiffness between the replacement support structures. The replacement support structure in this scheme consists of precast replacement support plates and cast-in-place strip 3. Only the cast-in-place strip 3 needs to be poured, without overall pouring, which can effectively lock in the construction time. In addition, the embedded replacement support plates and embedded parts in this scheme can be reused, which can effectively reduce costs. At the same time, when the retaining structure is high, only the height of the cast-in-place strip needs to be changed, which can also reduce costs.

[0033] In this embodiment, a movable part 5 is slidably connected to the mounting component 4 in parallel. The mounting component 4 is provided with a pin for limiting the sliding of the movable part 5 (a conventional technique for those skilled in the art, so it is not shown in the figure). The embedded part includes a main body 6 with one end embedded in the cast-in-place strip 3. The other end of the main body 6 is hinged with parallel main rods 7. An adjusting rod 8 is slidably connected to the main rod 7 in a coaxial manner. The ends of the adjusting rods 8 are detachably connected to the corresponding movable parts 5. The main rods 7 are provided with a limiting structure for limiting the sliding of the adjusting rods 8 relative to the main rods 7.

[0034] In this scheme, after the precast replacement support plate is installed, the restriction structure on one side of the precast replacement support plate is released from the restriction of the adjusting rod 8, and the pin is removed. The corresponding moving part 5 is then slid. At this time, the moving part 5 drives the corresponding adjusting rod 8 to deflect and slide relative to the main rod 7, thereby greatly adjusting the orientation of the embedded part on that side, that is, the force transmission direction of the embedded part. Compared with the traditional temporary replacement support structure, this scheme can adjust the force transmission direction of the replacement support structure according to the construction situation, and can play a better supporting role.

[0035] In this embodiment, the limiting structure includes an annular block 9 coaxially slidably connected to the main rod 7. The main rod 7 is provided with a pushing structure 10 for pushing the annular block 9 to slide. The main rod 7 has several through holes arranged radially around its periphery. Each through hole is coaxially slidably connected with a limiting rod 11, and an elastic reset member 12 is provided between the limiting rod 11 and the through hole. The adjusting rod 8 is provided with several limiting holes that cooperate with the limiting rod 11, and one end face of the annular block 9 is inclined.

[0036] When it is necessary to release the restriction of the limiting structure, simply push the annular block 9 away from the limiting rod 11 by pushing the structure 10. Under the action of the elastic reset member 12, the limiting rod 11 disengages from the limiting hole, allowing the adjusting rod 8 to slide relative to the main rod 7. After the adjustment is completed, use the pushing structure 10 to drive the annular block 9 to reset. The annular block 9 will press the limiting rod 11 into the limiting hole, thus completing the locking.

[0037] In this embodiment, each groove is provided with a control shaft 13 parallel to the moving part 5. Several sleeves 14 are coaxially rotatably connected to the control shaft 13. Both ends of each sleeve 14 are rotatably connected to ear plates 15 fixedly connected to the moving part 5. Each sleeve 14 is threadedly connected to a connecting seat 16 for detachably hinged to the end of the adjusting rod 8. The connecting seat 16 is slidably connected to the moving part 5. Several positioning holes facing its axis are distributed circumferentially on the inner wall of the sleeve 14. Several cavities are provided inside the control shaft 13 that are directly opposite the sleeve 14. Several sliding grooves are provided on the periphery of the cavity along its radial direction. A positioning rod 18 slides elastically in the sliding groove. An electromagnet 17 for attracting the positioning rod 18 is provided in the cavity.

[0038] During subsequent construction, if local deformation of the post-cast strip is required, and the force transmission direction of some embedded parts needs to be locally adjusted, the electromagnets 17 corresponding to the other embedded parts that do not require adjustment are energized. The electromagnets 17 attract the corresponding positioning rods 18, causing the corresponding positioning rods 18 to disengage from the positioning holes. This separates the connection between the sleeves 14 corresponding to the embedded parts that do not require adjustment and the control shaft 13, and removes the restriction of the restricting structure of the embedded parts that need adjustment. At this time, only the control shaft 13 needs to be rotated to drive the corresponding sleeves 14 to rotate, thereby driving the connecting seat 16 to slide, achieving the purpose of adjusting the force transmission direction of the local embedded parts. After the adjustment is completed, the restriction structure on the embedded parts is restored, and the remaining electromagnets 17 are de-energized.

[0039] In this embodiment, both ends of the sleeve 14 are provided with several arc-shaped abutting grooves, and several abutting blocks 19 that cooperate with the abutting grooves are elastically slidably provided on the ear plate 15. The ends of the abutting blocks 19 are arc-shaped.

[0040] By engaging the clamping block 19 with the clamping groove, a certain resistance is applied to the rotation of the sleeve 14, preventing the sleeve 14 from rotating synchronously due to the friction between the shaft and the sleeve 14.

[0041] In this embodiment, an elastic pad is provided at the edge of the precast replacement support plate; the elastic pad is used to compensate for the gap generated between the cast-in-place strip 3 and the precast replacement support plate when the cast-in-place strip 3 undergoes local deformation.

[0042] A construction method for a temporary support structure for foundation pits includes the following steps:

[0043] 1) Construction preparation: Clean the areas where the foundation pit bottom slab 1 and foundation pit support structure 2 need to be poured and tie the reinforcing bars; after installing the formwork, install the embedded parts in sequence, and then pour the cast-in-place strip 3;

[0044] 2) Installation of precast replacement support plate: After the curing of the cast-in-place strip 3 is completed, the installation part 4 and the moving part 5 are removed from the precast replacement support plate, and the end of the adjusting rod 8 in the embedded part is hinged to the corresponding connecting seat 16 on the moving part 5; the adjusting rod 8 is restricted from sliding relative to the main rod 7 by the limiting structure; then the precast replacement support plate is hoisted to ensure that the end face of the precast replacement support plate is in contact with the cast-in-place strip 3, and the installation part 4 is fixedly installed in the groove by bolts; then the horizontal support frame 20 is installed between adjacent precast replacement support plates.

[0045] 3) Overall adjustment of the replacement support structure: The limiting structure, control shaft 13, and moving part 5 on the horizontal side of the precast replacement support plate remain unchanged. The pushing structure 10 in the limiting structure on the vertical side of the precast replacement support plate is activated. The pushing structure 10 drives the annular block 9 away from the limiting rod 11. Under the action of the elastic reset part 12, the limiting rod 11 disengages from the limiting hole, allowing the adjusting rod 8 to slide relative to the main rod 7. Then, the pin on the vertical side of the precast replacement support plate is removed, and the moving part 5 is slid to significantly adjust the orientation of the embedded parts on the vertical side of the precast replacement support plate. The force transmission direction of the foundation pit retaining structure to the vertical groove of the precast replacement support plate is adjusted; after adjustment, the pin is reset, and the corresponding push structure 10 drives the ring block 9 to reset. The ring block 9 squeezes the limit rod 11 into the limit hole to complete the locking; then, keeping the limiting structure, control shaft 13 and moving part 5 on the vertical side of the precast replacement support plate unchanged, the orientation of the embedded parts on the horizontal side of the precast replacement support plate is adjusted in the same way, thereby adjusting the force transmission direction of the horizontal groove of the precast replacement support plate to the foundation pit bottom plate 1; then the support inside the foundation pit is dismantled.

[0046] 4) Precise Control: During subsequent construction, if local deformation of the post-cast strip is required, and the force transmission direction of some embedded parts needs to be locally adjusted, the electromagnets 17 corresponding to the other embedded parts that do not require adjustment are energized. The electromagnets 17 attract the corresponding positioning rods 18, causing the corresponding positioning rods 18 to disengage from the positioning holes. This separates the connection between the sleeves 14 corresponding to the embedded parts that do not require adjustment and the control shaft 13, and removes the restriction of the limiting structure of the embedded parts that need adjustment. At this time, only the control shaft 13 needs to be rotated to drive the corresponding sleeves 14 to rotate, thereby driving the connecting seat 16 to slide, achieving the purpose of adjusting the force transmission direction of the local embedded parts. After the adjustment is completed, the restriction structure on the embedded parts is restored, and the remaining electromagnets 17 are de-energized.

[0047] 5) Recycling: After construction is completed, the installation component 4 and the precast replacement support plate are disassembled, the precast replacement support plate is removed and recycled, the cast-in-place strip 3 is removed, and the embedded parts are recycled.

[0048] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A temporary support structure for a foundation pit, characterized in that: The system includes multiple precast replacement support plates spaced apart between the foundation pit bottom slab and the foundation pit support structure. Cast-in-place strips are poured on the contact surfaces of the foundation pit bottom slab, the foundation pit support structure, and the precast replacement support plates. Several embedded parts are provided on the end faces of the cast-in-place strips facing the precast replacement support plates. Grooves are formed on the sidewalls of the precast replacement support plates facing the cast-in-place strips, and mounting components are detachably connected to these grooves. The mounting components are detachably connected to the embedded parts. Horizontal support frames are provided between adjacent precast replacement support plates. Moving parts are slidably connected to the mounting components, and pins are provided on the mounting components to restrict the sliding of the moving parts. Each embedded part includes a main body with one end embedded in the cast-in-place strip, and parallel main rods are hinged to the other end of the main body. Adjusting rods are slidably connected coaxially to the main rods, and the ends of the adjusting rods are detachably connected to the corresponding moving parts. Each main rod is provided with a limiting structure to restrict the sliding of the adjusting rods relative to the main rod. The limiting structure includes a ring slidably connected coaxially to the main rod. The ring block has a main rod with a pushing structure for sliding. Several through holes are radially arranged on the circumference of the main rod, each through hole having a limit rod slidably connected coaxially. An elastic reset element is provided between the limit rod and the through hole. Several limit holes that mate with the limit rods are provided on the adjusting rod, and one end face of the ring block is inclined. A control shaft parallel to the moving part is provided in each groove. Several sleeves are rotatably connected coaxially to the control shaft. Ear plates fixedly connected to the moving part are rotatably connected to both ends of each sleeve. Each sleeve is threaded with a connecting seat for detachable hinge connection to the end of the adjusting rod, and the connecting seat is slidably connected to the moving part. Several positioning holes facing the axis are distributed circumferentially on the inner wall of the sleeve. Several cavities facing the sleeve are provided inside the control shaft. Several radially arranged sliding grooves are provided on the circumference of each cavity. A positioning rod slides elastically within the sliding groove, and an electromagnet for attracting the positioning rod is provided within the cavity.

2. The temporary support structure for a foundation pit according to claim 1, characterized in that: Both ends of the sleeve are provided with several arc-shaped abutment grooves, and several abutment blocks that cooperate with the abutment grooves are elastically slidably provided on the ear plate. The ends of the abutment blocks are arc-shaped.

3. The temporary support structure for a foundation pit according to claim 2, characterized in that: The edges of the prefabricated replacement support plate are provided with elastic padding.

4. The construction method of a temporary support structure for a foundation pit according to claim 3, characterized in that, Includes the following steps: 1) Construction preparation: Clean the foundation pit bottom slab and the area where the foundation pit support structure needs to be poured and tie the reinforcing bars; after installing the formwork, install the embedded parts in sequence, and then pour the cast-in-place strip; 2) Installation of precast replacement plates: After the cast-in-place strip has been cured, the installation parts and moving parts are removed from the precast replacement plates, and the end of the adjusting rod in the embedded part is hinged to the corresponding connecting seat on the moving part; the sliding of the adjusting rod relative to the main rod is restricted by the limiting structure; then the precast replacement plates are hoisted to ensure that the end face of the precast replacement plates is in contact with the cast-in-place strip, and the installation parts are fixed in the groove with bolts; then the horizontal support frame is installed between adjacent precast replacement plates. 3) Overall Adjustment of the Replacement Support Structure: The limiting structure, control shaft, and moving parts on the horizontal side of the precast replacement support slab remain unchanged. Activate the pushing structure in the limiting structure on the vertical side of the precast replacement support slab. The pushing structure drives the annular block away from the limiting rod. Under the action of the elastic reset component, the limiting rod disengages from the limiting hole, allowing the adjusting rod to slide relative to the main rod. Then, remove the pin on the vertical side of the precast replacement support slab, slide the moving part, and significantly adjust the orientation of the embedded parts on the vertical side of the precast replacement support slab, thereby controlling the force transmission direction of the pit retaining structure to the vertical groove of the precast replacement support slab. After adjustment, reset the pin, and correspondingly, push the structure to reset the annular block. The annular block presses the limiting rod into the limiting hole, completing the locking. Then, keeping the limiting structure, control shaft, and moving parts on the vertical side of the precast replacement support slab unchanged, adjust the orientation of the embedded parts on the horizontal side of the precast replacement support slab in the same way, thereby controlling the force transmission direction of the horizontal groove of the precast replacement support slab to the pit bottom slab. Finally, dismantle the supports within the pit. 4) Precise Control: During subsequent construction, if local deformation of the post-cast strip necessitates local control of the force transmission direction of some embedded parts, the electromagnets opposite the remaining embedded parts that do not require control are energized. The electromagnets attract the corresponding positioning rods, causing them to disengage from the positioning holes. This separates the connection between the sleeves corresponding to the embedded parts that do not require control and the control shaft, and releases the restriction of the structure limiting the embedded parts that require control. At this point, simply rotating the control shaft will drive the corresponding sleeves to rotate, thereby driving the connecting seat to slide, achieving the purpose of controlling the force transmission direction of the local embedded parts. After the control is completed, the restriction structure on the embedded parts is restored, and the remaining electromagnets are de-energized. 5) Recycling: After construction is completed, the installation parts and precast replacement plates are disassembled, the precast replacement plates are removed and recycled, the cast-in-place strip is removed, and the embedded parts are recycled.

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