Error-adjustable fabricated underground structure wall brace joint and construction method

Abstract

The application discloses an error-adjustable assembled underground structure wall-bracing joint and a construction method, in the structure wall-bracing joint, a ground-connected wall pre-buried opening is arranged on a prefabricated ground-connected wall, and the ground-connected wall pre-buried opening is closed by a detachable pre-buried connecting piece cover plate before being placed in position; a joint connecting section steel is pre-buried at the end of the prefabricated horizontal support, and a section steel opening is arranged at the end of the joint connecting section steel; the pre-buried connecting piece is arranged in the ground-connected wall pre-buried opening and comprises a pre-buried piece tooth groove and an anchoring structure; the movable connecting piece passes through the section steel opening and forms an adjustable clamping cooperation with the pre-buried piece tooth groove of the pre-buried connecting piece, so that the installation error adjustment of the prefabricated horizontal support relative to the prefabricated ground-connected wall in the horizontal and vertical directions is realized. The ground-connected wall and the main side wall are combined into one, the horizontal cross brace and the main structure cross beam are combined into one, the horizontal and vertical errors of the wall-bracing joint construction can be adjusted through the connecting piece, the joint connection performance is reliable, the construction is convenient and fast, and the construction period is saved.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated underground structure technology, specifically relating to an error-adjustable prefabricated underground structure wall support node and construction method. Background Technology

[0002] With the acceleration of urbanization, the development and utilization of underground space is becoming increasingly widespread. Prefabricated underground structures, due to their advantages such as fast construction speed, less on-site wet work, and controllable quality, have become an important development direction in underground engineering construction. In the prefabricated design and construction of underground structures, temporary enclosure structures and permanent main structures are often separated. If the temporary and permanent structures can be combined, the amount of masonry work can be saved and the construction progress can be accelerated. The connection performance of the wall support nodes in the combined temporary and permanent underground structures directly determines the integrity, load-bearing capacity, and seismic performance of the structure. Therefore, it is necessary to explore reasonable and reliable node connection methods. At present, common connection methods mostly use welding, bolting, or more conventional steel bar lap splicing. These methods often cannot meet the high-precision installation requirements of prefabricated components.

[0003] In actual construction, due to the complex underground environment, difficulties in hoisting and positioning, and the accumulation of manufacturing errors in precast components, unavoidable construction deviations are prone to occur at wall support joints. Most existing rigid connection joints lack effective error adjustment mechanisms. Once deviations occur, it is often necessary to correct them through complex on-site cutting, excavation, or the use of a large number of pads / plates. This not only seriously affects construction efficiency and increases construction difficulty, but may also lead to uneven stress on the joints, leaving safety hazards.

[0004] Therefore, in order to overcome the shortcomings of existing prefabricated underground structure wall-support joints, such as poor adaptability to construction errors, difficulty in adjustment, and insufficient connection reliability, it is urgent to develop a wall-support joint connection structure and construction method that is simple in construction, convenient to install, and has multi-directional error adjustment capabilities. This invention aims to achieve an efficient and reliable connection between prefabricated diaphragm walls and horizontal supports through an innovative mechanical locking and toothed engagement mechanism, possessing significant engineering application value. Summary of the Invention

[0005] This invention is proposed to solve the problems existing in the prior art, and its purpose is to provide an error-adjustable prefabricated underground structure wall support node and construction method.

[0006] The technical solution of this invention is: An error-adjustable prefabricated underground structural wall support node, the structural wall support node comprising: The precast diaphragm wall has inner and outer reinforcing bars on its inner and outer sides, respectively, and a pre-embedded opening is provided on it. The pre-embedded opening is located at the connection node between the precast diaphragm wall and the precast horizontal support. The pre-embedded opening is closed by a detachable pre-embedded connector cover plate before it is lowered into place. A prefabricated horizontal support is provided with upper support steel bars and lower support steel bars on its upper and lower sides, respectively. A joint connecting steel is pre-embedded at its end, and the end of the joint connecting steel is provided with a steel opening. The pre-embedded connector is set in the pre-embedded opening of the diaphragm wall, and includes the pre-embedded tooth groove and the anchoring structure; The movable connector passes through the steel opening of the joint connecting steel and forms an adjustable engagement with the embedded tooth groove of the pre-embedded connector to realize the adjustment of the installation error of the prefabricated horizontal support relative to the prefabricated diaphragm wall in the horizontal and / or vertical directions.

[0007] In the above technical solution, the thickness of the precast diaphragm wall is T The width of the prefabricated horizontal support is B 1. The groove width of the pre-embedded part opening along the width direction of the precast diaphragm wall is... B 2. The opening of the diaphragm wall embedded part is located on the inner side of the precast diaphragm wall. The groove depth does not exceed 0.5 times the thickness T of the precast diaphragm wall, and the groove width B2 is 0.4 to 0.6 times the width B1 of the precast horizontal support.

[0008] In the above technical solution, the horizontal support embedding section of the joint connecting steel is provided with anchor bars, which are fixedly connected to the outer side of the flange of the joint connecting steel to enhance the anchoring performance of the joint connecting steel in the prefabricated horizontal support.

[0009] In the above technical solution, a low-friction sliding plate is provided below the prefabricated horizontal support to facilitate lateral adjustment of the prefabricated horizontal support.

[0010] In the above technical solution, the height of the prefabricated horizontal support is H 1. A joint connecting steel section is pre-embedded on the side near the precast diaphragm wall. After being lowered into place, it is used to connect with the precast diaphragm wall. The embedment depth of the joint connecting steel section in the precast horizontal support is... L 2. At the same time, steel anchor bars are provided to enhance the anchoring performance of the joint connection steel.

[0011] In the above technical solution, the opening of the steel profile is located on the side where the joint connecting steel profile is connected to the precast diaphragm wall, and the opening of the steel profile is used to connect the joint connecting steel profile and the embedded connector.

[0012] In the above technical solution, the pre-embedded connector cover plate closes the inside of the precast diaphragm wall after the precast diaphragm wall is processed and manufactured. The pre-embedded connector cover plate is opened before the precast diaphragm wall is assembled with the precast horizontal support.

[0013] In the above technical solution, the anchoring structure of the pre-embedded connector includes pre-embedded stiffening ribs and connector anchor bars. The pre-embedded stiffening ribs are used to strengthen the structural rigidity of the pre-embedded connector, and the connector anchor bars are used to enhance the embedding strength of the pre-embedded connector in the precast diaphragm wall.

[0014] In the above technical solution, the embedded part groove of the pre-embedded connector is used to realize the lateral error adjustment of the wall panel node along the horizontal support. The embedded part groove has a tooth-shaped cross section with one side straight and the other side inclined. Multiple grooves are arranged in parallel along the thickness direction of the precast diaphragm wall.

[0015] In the above technical solution, the movable connector includes a connecting screw, a connector back plate, a fastening nut, a bolt washer, and a connector tooth groove. The connecting screw passes through the steel opening of the connector connecting steel, and the connector tooth groove forms a selectable engaging fit with the embedded tooth groove of the pre-embedded connector.

[0016] In the above technical solution, the movable connector moves to a suitable position within the embedded connector based on the relative positional relationship between the precast diaphragm wall and the precast horizontal support, and then locks in place, thereby achieving adjustment of the node horizontal error. The lateral adjustment range of the error is [missing information]. L 1. Vertical adjustment range is H 2. Specifically: The movable connector has a first working state and a second working state. In the first working state, the movable connector is rotated to the direction before insertion, at which time it can freely enter and exit the pre-embedded opening of the wall diaphragm. In the second working state, the movable connector is rotated to the direction after insertion, at which time it engages and locks with the toothed groove of the pre-embedded part.

[0017] In the above technical solution, the dimension of the pre-embedded opening in the diaphragm wall in the horizontal direction is larger than the corresponding dimension of the connecting steel section of the joint, so as to provide a margin for error adjustment in the horizontal direction; the toothed groove of the pre-embedded part extends in the vertical direction to provide a margin for error adjustment in the vertical direction.

[0018] In the above technical solution, after the precast diaphragm wall is connected to the precast horizontal support, self-compacting concrete is poured into the embedded connector and post-joint concrete is poured. The lengths of the self-compacting concrete and the post-joint concrete along the direction of the precast horizontal support are respectively... L 3 and L 4.

[0019] The above technical solution also includes a temporary support bracket, which is composed of a top steel plate, side steel plates, square steel support, and fixing bolts. A low-friction sliding plate is provided on the upper side of the top steel plate. Before the precast diaphragm wall is connected to the precast horizontal support, the temporary support bracket is connected to the precast diaphragm wall by the fixing bolts to ensure the stability of the precast horizontal support during the assembly stage.

[0020] In the above technical solution, an inner end plate of a lead screw is fixedly installed on the temporary support bracket, and an outer end plate of the lead screw is also provided. The outer end plate of the lead screw is arranged opposite to the inner end plate of the lead screw, and the outer end plate of the lead screw is connected to the inner end plate of the lead screw through lead screw 1 and lead screw 2. The outer end plate of the lead screw can play a supporting role for the prefabricated horizontal support. By inserting lead screw 1 and lead screw 2 into the inner end plate and the outer end plate of the lead screw, and adjusting the position of the lead screw, the prefabricated horizontal support is adjusted into place along the support lateral direction.

[0021] The second objective of this invention is to provide a construction method for prefabricated underground structural panel wall joints with adjustable error, comprising the following steps: S1. Hoist the precast diaphragm wall to the design position. After accurate positioning, open the cover plate of the embedded connector at the pre-embedded opening of the diaphragm wall inside the precast diaphragm wall. S2. Secure the temporary support bracket to the inside of the precast diaphragm wall; S3. Adjust the movable connector to the first working state, that is, rotate the movable connector to the direction before insertion so that it passes through the steel opening at the end of the connector connecting steel; S4. Use movable tooling or gantry crane to hoist the prefabricated horizontal support into place, so that the joint connecting steel is inserted into the pre-embedded opening of the prefabricated diaphragm wall; S5. Insert lead screw 1 and lead screw 2 into the inner end plate and the outer end plate of the lead screw. By adjusting the position of the lead screw, move the prefabricated horizontal support in the horizontal direction. Adjust the horizontal position of the joint connecting steel in the pre-embedded opening of the diaphragm wall to adjust the lateral construction error of the panel wall node. S6. After the lateral error of the precast diaphragm wall is eliminated, switch the movable connector to the second working state, that is, rotate it to the direction after insertion (rotate the movable connector 90°) so that it can form a locking fit with the toothed structure of the pre-embedded connector; S7. Adjust the engagement position of the movable connector on the toothed structure in the vertical direction to eliminate vertical construction errors in the panel wall joint; S8. After adjusting the horizontal support vertically into place, tighten the fastening nut to secure the movable connector in the pre-embedded connector; S9. Remove the temporary support brackets and lead screws 1, 2 and the outer end plate of the lead screws; S10. Inject self-compacting concrete into the pre-embedded opening in the diaphragm wall, and pour concrete after pouring the joint in the exposed area of ​​the connecting steel section to complete the joint construction.

[0022] The beneficial effects of this invention are as follows: 1. High connection accuracy: The method of pre-embedding connectors in the precast diaphragm wall and pre-embedding joints at the ends of the precast horizontal support to connect the steel profiles is adopted. In addition, the connectors are provided with toothed grooves, which can effectively increase the accuracy of connection positioning.

[0023] 2. Dual-degree-of-freedom error adjustment: The connecting node, through a row of toothed grooves set by the pre-embedded connector, can achieve lateral error adjustment range in the horizontal direction. L 1) The pre-embedded part groove and the connector groove can be adjusted within a small range in the vertical direction, thereby effectively absorbing the cumulative deviation in construction in both directions.

[0024] 3. Reliable connection during construction: The connection method, which combines the mechanical toothed engagement of the connector with the locking of the nut, results in high joint strength and clear stress distribution, avoiding the uncertainty of on-site welding or complex bolt connections.

[0025] 4. Reliable permanent connection: After the connection nodes are spliced ​​and locked, self-compacting concrete is poured into the pre-embedded connectors, and concrete is poured on the exposed section of the joint connecting steel to form a permanent structure, ensuring that the node is a rigid connection with excellent stress performance.

[0026] 5. Permanent and temporary combination: The precast diaphragm wall serves as both the enclosure structure and the side wall of the main structure, and the precast horizontal support can also serve as the main structure beam / slab. This wall support node with adjustable error ensures the reliability of the connection between the diaphragm wall and the support, which helps to realize the permanent and temporary combination type in underground structures.

[0027] 6. Convenient construction: Mechanical connection is used in the assembly stage to achieve rapid construction, and concrete materials are used for subsequent nodes. The operation steps are simple, and no large equipment is required to assist in correction, which significantly shortens the construction period and reduces the construction difficulty. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the error-adjustable prefabricated underground structure wall support node structure of the present invention in the permanent stage; Figure 2 This is a schematic diagram of the error-adjustable prefabricated underground structure wall support node structure of the present invention during the assembly stage; Figure 3 This is a schematic diagram of the prefabricated diaphragm wall of the present invention; Figure 4 This is a schematic diagram of the prefabricated horizontal cross brace of the present invention; Figure 5This is a schematic diagram of the cross-sectional structure of the wall support node connection of the present invention; Figure 6 This is a cross-sectional structural diagram of the wall support node of the present invention during the assembly stage; Figure 7 This is a schematic diagram of the movable connector of the present invention before insertion; Figure 8 This is a schematic diagram of the movable connector of the present invention after insertion; Figure 9 This is a schematic diagram illustrating the adjustment of the node position along the horizontal support direction according to the present invention; Figure 10 This is a schematic diagram of the tooth groove clamping after the node of the present invention is adjusted into place along the horizontal support direction; Figure 11 This is a schematic diagram of the tightening of the nut after the node tooth groove is clamped; Figure 12 This is a schematic diagram showing the adjustment of the node position along the horizontal support direction to the innermost end according to the present invention.

[0029] in: 1-Precast diaphragm wall; 2-Inner reinforcing steel bars of the diaphragm wall; 3-Outer reinforcing steel bars of the diaphragm wall; 4-Opening for embedded parts in the diaphragm wall; 5-Embedded connector; 6-Embedded stiffening rib; 7- Anchoring reinforcement for connectors; 8- Embedded part toothed groove; 9-Embedded connector cover plate; 10-Precast horizontal support; 11 - Support the upper reinforcing bars; 12 - Support the lower reinforcing bars; 13-Joint connecting steel section; 14-Steel section anchoring reinforcement; 15-Opening for steel profile; 16-Modible connector; 17-Connecting screw; 18-Connector back plate; 19 - Fastening nut; 20 - Bolt washer; 21-Connector toothed groove; 22-Post-cast concrete at the joint; 23-Self-compacting concrete; 24-Temporary support bracket; 25 - Top steel plate of the bracket; 26 - Side steel plate of the bracket; 27- Bracket fixing bolt; 28- Low-friction sliding plate; 29 - Inner end plate of the lead screw; 30 - Outer end plate of the lead screw; 31-Lead screw 1; 32-Lead screw 2; 33-Corner support square steel; L 1- Horizontal adjustment range; L 2-Embedding depth; L 3- Scope of self-compacting concrete pouring; L 4-Length of the post-cast section at the node; H 1- Prefabricated horizontal support height; H 2-Vertical adjustment range; B 1- Width of prefabricated horizontal support; B 2-Width of the groove for the embedded part; T -Thickness of precast diaphragm walls. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: Example 1

[0031] like Figures 1 to 12 As shown, the specific implementation steps of the prefabricated underground structure wall support node with adjustable error according to the present invention are as follows: i. Component prefabrication and preparation Precast diaphragm wall 1: The inner reinforcing bars 2 and outer reinforcing bars 3 of the diaphragm wall are tied in the factory. The embedded connectors 5 (including embedded toothed grooves 8, stiffening ribs 6, and anchoring reinforcing bars 7) are positioned at predetermined locations on the wall, and the embedded connector cover plates 9 are installed to seal the inner side of the precast diaphragm wall 1. Concrete is poured to form the precast diaphragm wall 1 with the diaphragm wall embedded part openings 4.

[0032] Precast horizontal support 10: Tie the upper reinforcing bars 11 and lower reinforcing bars 12 of the support. Pre-embed joint connecting steel 13 at the end of the support, and weld steel anchoring steel 14 to the outside of its flange. Ensure that the position of the support steel opening 15 at the end of the joint connecting steel 13 is accurate.

[0033] ii. On-site installation and error adjustment Hoisting the precast diaphragm wall 1: Hoist the precast diaphragm wall 1 into the designed trench section. After accurate positioning, open the embedded connector cover plate 9 and check the position and shape of the embedded connector 5.

[0034] Install temporary support bracket 24: Align the temporary support bracket 24 with the inside of the precast diaphragm wall 1, and fix the side steel plate 25 of the bracket to the inside of the precast diaphragm wall 1 using bracket fixing bolts 27.

[0035] Assembly node: Pass the connecting screw 17 of the movable connector 16 through the support steel opening 15 at the end of the connector connecting steel 13, and initially install the nut 19 and washer 20. At this time, the movable connector 16 is in the direction before insertion (the direction of the toothed groove of the connector is convenient for insertion).

[0036] Insert the joint connecting steel: hoist the prefabricated horizontal support 10, tilt the prefabricated horizontal support 10 appropriately, and insert the joint connecting steel 13 at its end into the hole 4 of the diaphragm wall embedded part.

[0037] Lateral error adjustment: due to the width of the groove in the embedded part B 2 is approximately the width of the prefabricated horizontal support. B The design of 1 / 2 has a joint connection type 1 with space for lateral movement within the pre-embedded connector 5. During hoisting and assembly, the prefabricated horizontal support 10 is pushed horizontally to make its axis coincide with the design axis. The lead screws 1 and 2 are inserted into the inner end plate 29 and the outer end plate 30 of the lead screws. By adjusting the position of the lead screws, the prefabricated horizontal support 10 is adjusted into place laterally along the support.

[0038] Tooth groove clamping: After the prefabricated horizontal support 10 is moved into place laterally, the movable connector 16 is rotated about 90° so that the tooth groove 21 of the connector is engaged in the tooth groove 8 of the pre-embedded connector 5, thus restricting the horizontal movement.

[0039] Vertical error adjustment: By tightening the nut 19 on the connecting screw 17, the thread transmission principle is used to drive the connecting back plate 18 and the entire prefabricated horizontal support 10 to make slight vertical adjustments until the design elevation is reached, thus eliminating vertical construction errors.

[0040] Final locking: After vertical adjustment, tighten nut 19 to make the back plate 18 of the connector fit tightly with the connecting steel 13 of the joint, and clamp the movable connector 16 in the pre-embedded connector 5.

[0041] iii. Dismantle temporary structures Remove the temporary support bracket 24, lead screw 1, lead screw 2 and lead screw outer end plate 30.

[0042] iv. Post-pouring stage Concrete pouring: After the mechanical connection of the joint is locked and passes inspection, self-compacting concrete 23 is poured into the hole 4 of the diaphragm wall embedded part to fill all gaps. At the same time, formwork is erected at the exposed part of the joint connecting steel 13, and post-joint concrete 22 is poured. After the concrete reaches the design strength, the formwork is removed, and the joint construction is completed. Example 2

[0043] An adjustable-error prefabricated underground structure wall support node constructed using the construction method described in Example 1, wherein the structural wall support node includes: The precast diaphragm wall 1 has inner reinforcing bars 2 and outer reinforcing bars 3 on its inner and outer sides, respectively. A pre-embedded opening 4 is provided on it. The pre-embedded opening 4 is located at the connection node between the precast diaphragm wall 1 and the precast horizontal support 10. The pre-embedded opening 4 is closed by a detachable pre-embedded connector cover plate 9 before it is lowered into place. A prefabricated horizontal support 10 is provided with upper support steel bars 11 and lower support steel bars 12 on its upper and lower sides, respectively. A joint connecting steel 13 is pre-embedded at its end, and a steel opening 15 is provided at the end of the joint connecting steel 13. The pre-embedded connector 5 is set in the pre-embedded opening 4 of the diaphragm wall, and includes the pre-embedded tooth groove 8 and the anchoring structure. The movable connector 16 passes through the steel opening 15 of the connector connecting steel 13 and forms an adjustable engagement with the pre-embedded toothed groove 8 of the pre-embedded connector 5 to realize the adjustment of the installation error of the prefabricated horizontal support 10 relative to the prefabricated diaphragm wall 1 in the horizontal and / or vertical directions.

[0044] In this embodiment, the wall support node structure includes a precast diaphragm wall, a precast horizontal support, a joint connecting steel, an embedded connector, a movable connector, post-cast concrete, self-compacting concrete, and a temporary support bracket. The precast diaphragm wall has inner and outer reinforcing bars on its inner and outer sides, respectively. The inner side is sealed with a cover plate of the embedded connector before installation. An embedded opening is reserved at the connection node between the precast diaphragm wall and the horizontal support. The horizontal support has upper and lower reinforcing bars on its upper and lower sides, respectively. The joint connecting steel has steel anchoring bars in the embedded section of the horizontal support, and a steel opening at the end of the joint connecting steel. The embedded connector consists of embedded grooves, embedded stiffening ribs, and anchoring bars. The movable connector consists of a connecting screw, a connector back plate, a nut, a bolt washer, and connector grooves. The construction method includes the following steps: hoisting the precast diaphragm wall and horizontal supports; opening the cover plate of the embedded connector; installing the temporary support brackets on the inside of the precast diaphragm wall with bolts; adjusting the horizontal supports into position laterally, then rotating the movable connector 90° to engage with the embedded part's toothed groove; adjusting the horizontal supports vertically into position and tightening the nuts; pouring self-compacting concrete into the embedded connectors and pouring the joint concrete to complete the joint construction. This structure integrates the diaphragm wall with the main side wall, and the horizontal brace with the main structural beam. Lateral and vertical errors in the wall support joint construction can be adjusted using the connectors, ensuring reliable joint connection performance, convenient and quick construction, and saving construction time.

[0045] Furthermore, in this embodiment, the thickness of the precast diaphragm wall 1 is T, the width of the precast horizontal support 10 is B1, and the width of the groove of the embedded part opening 4 along the width direction of the precast diaphragm wall 1, i.e., the groove width of the embedded part, is B2. A diaphragm wall embedded part opening 4 is provided at the height direction of the connection with the precast horizontal support 10. The diaphragm wall embedded part opening 4 is located inside the precast diaphragm wall 1, and the groove depth does not exceed 0.5 times the thickness T of the precast diaphragm wall 1. The embedded part opening is closed with an embedded connector cover plate, and the dimension of the embedded part opening along the width direction of the precast diaphragm wall is the groove width of the embedded part.B 2. The slot width B2 is 0.4 to 0.6 times the width B1 of the precast horizontal support 10. Preferably, the slot width of the embedded part is... B 2 is approximately the width of the prefabricated horizontal support. B 0.5 times 1.

[0046] Furthermore, in this embodiment, the height of the prefabricated horizontal support 10 is H1, and a joint connecting steel 13 is pre-embedded on the side near the prefabricated diaphragm wall 1. After being lowered into place, it is used to connect with the prefabricated diaphragm wall 1.

[0047] Furthermore, in this embodiment, the embedment depth of the joint connecting steel 13 in the prefabricated horizontal support 10 is L2, and steel anchoring steel bars 14 are provided to enhance the anchoring performance of the joint connecting steel 13.

[0048] Furthermore, in this embodiment, it can also be considered that the pre-embedded connector cover plate 9 closes the inside of the prefabricated diaphragm wall 1 after the prefabricated diaphragm wall 1 is processed and manufactured, and the pre-embedded connector cover plate 9 is opened before the prefabricated diaphragm wall 1 and the prefabricated horizontal support 10 are assembled.

[0049] It should be noted that: the pre-embedded connector cover plate 9 is used to close the inside of the prefabricated diaphragm wall 1 after the prefabricated diaphragm wall 1 is manufactured. The pre-embedded connector cover plate 9 is opened before the prefabricated diaphragm wall 1 and the prefabricated horizontal support 10 are assembled.

[0050] Furthermore, in this embodiment, the horizontal support embedding section of the joint connecting steel 13 is provided with anchor bars 14, which are fixedly connected to the outer flange of the joint connecting steel 13 to enhance the anchoring performance of the joint connecting steel 13 within the prefabricated horizontal support 10.

[0051] Furthermore, in this embodiment, the steel profile opening 15 can be located on the side where the joint connecting steel profile 13 connects to the precast diaphragm wall 1, and the steel profile opening 15 is used to connect the joint connecting steel profile 13 and the embedded connector 5.

[0052] Furthermore, in this embodiment, the anchoring structure of the pre-embedded connector 5 may include a pre-embedded stiffening rib 6 and a connector anchoring bar 7. The pre-embedded stiffening rib 6 is used to strengthen the structural rigidity of the pre-embedded connector 5, and the connector anchoring bar 7 is used to enhance the embedding strength of the pre-embedded connector 5 in the precast diaphragm wall 1.

[0053] Furthermore, in this embodiment, the embedded part groove 8 of the pre-embedded connector 5 is used to realize the lateral error adjustment of the wall panel node along the horizontal support 10. The embedded part groove 8 has a toothed cross section with one side straight and the other side inclined. Multiple grooves are arranged in parallel along the thickness direction of the prefabricated diaphragm wall 1.

[0054] Furthermore, in this embodiment, the movable connector 16 may include a connecting screw 17, a connector back plate 18, a fastening nut 19, a bolt washer 20, and a connector tooth groove 21. The connecting screw 17 passes through the steel opening 15 of the connector connecting steel 13, and the connector tooth groove 21 forms a selectable engaging fit with the embedded tooth groove 8 of the embedded connector 5.

[0055] Furthermore, in this embodiment, the movable connector 16 can be moved to a suitable position within the embedded connector 5 based on the relative positional relationship between the precast diaphragm wall 1 and the precast horizontal support 10, and then locked in place to achieve adjustment of the node horizontal error. The lateral adjustment range of the error is... L 1. Vertical adjustment range is H 2； The movable connector 16 has a first working state and a second working state. In the first working state, the movable connector 16 can freely enter and exit the pre-embedded opening 4 of the ground diaphragm wall. In the second working state, the movable connector 16 engages and locks with the toothed groove 8 of the pre-embedded part.

[0056] Furthermore, in this embodiment, the dimension of the pre-embedded opening 4 in the diaphragm wall in the horizontal direction is larger than the corresponding dimension of the connecting steel 13 in the joint, so as to provide a margin for error adjustment in the horizontal direction; the pre-embedded part groove 8 extends in the vertical direction to provide a margin for error adjustment in the vertical direction.

[0057] Furthermore, in this embodiment, after the precast diaphragm wall 1 is connected to the precast horizontal support 10, self-compacting concrete 23 is poured into the embedded connector 5 and post-joint concrete 22 is poured. The lengths of the self-compacting concrete 23 and the post-joint concrete 22 along the direction of the precast horizontal support 10 are respectively... L 3 and L 4.

[0058] Furthermore, in this embodiment, a temporary support bracket 24 may also be considered. The temporary support bracket 24 is composed of a top steel plate 25, a side steel plate 26, a support square steel 33, and fixing bolts 27. A low-friction sliding plate 28 is provided on the upper side of the top steel plate. Before the prefabricated diaphragm wall 1 is connected to the prefabricated horizontal support 10, the temporary support bracket 24 is connected to the prefabricated diaphragm wall 1 by the fixing bolts 28 to ensure the stability of the prefabricated horizontal support 10 during the assembly stage.

[0059] Furthermore, in this embodiment, an inner end plate 29 of a lead screw is fixedly installed on the temporary support bracket 24, and an outer end plate 30 of the lead screw is also provided. The outer end plate 30 of the lead screw is arranged opposite to the inner end plate 29 of the lead screw, and the outer end plate 30 of the lead screw is connected to the inner end plate 29 of the lead screw through lead screw 1 and lead screw 2. The outer end plate 30 of the lead screw can provide support for the prefabricated horizontal support 10. By inserting lead screw 1 and lead screw 2 into the inner end plate 29 and the outer end plate 30 of the lead screw, and adjusting the position of the lead screw, the prefabricated horizontal support 10 can be adjusted into position along the support lateral direction. Application Example 1

[0060] A subway station was constructed using the open-cut method, with a foundation pit depth of 18 meters. A diaphragm wall system with internal bracing was employed. A prefabricated approach combining temporary and permanent structures was adopted, integrating the temporary diaphragm walls with the permanent side walls of the station's main structure, and combining temporary concrete supports with permanent beams / slabs.

[0061] The prefabrication and construction of the joints are carried out using the error-adjustable prefabricated underground structure wall support joint and construction method described in this invention.

[0062] i. Component prefabrication and preparation The diaphragm wall with recessed cavities and pre-embedded toothed steel plates is prefabricated in the factory. The thickness of the prefabricated diaphragm wall at this station is... T =850 mm, width of prefabricated horizontal support B 1 = 1000 mm, height of prefabricated horizontal support H 1 = 800 mm, design width of the embedded part slot B 2 = 500 mm, theoretical lateral adjustment range L 1 = 230 mm. Embedding depth of the joint connecting steel section. L 2 = 600mm. Pouring range of self-compacting concrete. L 3 = 380 mm, length of the post-cast section at the node L 4 = 530 mm.

[0063] The connecting screw uses M30 high-strength bolts with a pitch of 3.5mm, and is designed with a vertical adjustment range. H 2 = 20 mm.

[0064] ii. On-site installation and error adjustment After the precast diaphragm walls on both sides were hoisted and lowered on site, measurements revealed that the precast diaphragm walls had a lateral deviation (too large) of 80mm and a vertical deviation of 10mm at a certain span's horizontal support.

[0065] An error-adjustable prefabricated underground structure wall support node and construction method according to the present invention: Pass the connecting screw of the movable connector through the opening in the supporting steel at the end of the connector connecting steel, and initially install the nut and washer. At this time, the movable connector is in the direction before insertion.

[0066] Hoist the prefabricated horizontal support, tilt the prefabricated horizontal support appropriately, and push the joint connecting steel at the end of the prefabricated horizontal support laterally into the diaphragm wall embedded part opening with a width of 500 mm.

[0067] After the prefabricated horizontal support is moved into place laterally, the movable connector is rotated about 90° so that the toothed groove of the connector is engaged in the toothed groove of the embedded connector, thus restricting the horizontal movement.

[0068] By tightening the nut on the connecting screw, the thread transmission principle is used to drive the connecting back plate and the entire prefabricated horizontal support to make a 10mm vertical adjustment, thus eliminating vertical construction errors.

[0069] After vertical adjustment, tighten the nuts to ensure that the back plate of the connector fits tightly against the connecting steel of the joint, and secure the movable connector within the pre-embedded connector.

[0070] After the mechanical connection of the joint is locked and passes inspection, self-compacting concrete is poured into the 380mm range inside the opening of the diaphragm wall embedded part to fill all gaps. Simultaneously, formwork is erected for a 530mm length of exposed steel section at the joint, and post-joint concrete is poured. Once the concrete reaches its design strength, the formwork is removed, completing the joint construction.

[0071] The adjustable-error prefabricated underground structure wall support node and construction method successfully absorbed the accumulated construction errors on site, eliminating the need for on-site cutting or hole enlargement operations. The installation time for a single node was shortened to 4 hours, and the final node bearing capacity was tested and met the design requirements. This achieved the expected goal of "permanent and temporary integration" by combining the diaphragm wall with the main side wall and the horizontal bracing with the main structural beam.

[0072] The present invention has been described in detail above with reference to the embodiments. However, the embodiments are not intended to limit the scope of protection of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. An error-adjustable prefabricated underground structure wall support node, characterized in that: The structural wall support node includes: A prefabricated diaphragm wall (1) is provided with a pre-embedded opening (4) for the diaphragm wall. The pre-embedded opening (4) for the diaphragm wall is closed by a detachable pre-embedded connector cover plate (9) before being lowered into place. A prefabricated horizontal support (10) has a joint connecting steel (13) pre-embedded at its end, and the end of the joint connecting steel (13) is provided with a steel opening (15). The pre-embedded connector (5) is set in the pre-embedded opening (4) of the diaphragm wall, and includes the pre-embedded tooth groove (8) and the anchoring structure; The movable connector (16) passes through the steel opening (15) of the joint connecting steel (13) and forms an adjustable engagement with the pre-embedded tooth groove (8) of the pre-embedded connector (5) to realize the installation error adjustment of the prefabricated horizontal support (10) relative to the prefabricated diaphragm wall (1) in the horizontal and / or vertical directions.

2. The error-adjustable prefabricated underground structure wall support node according to claim 1, characterized in that: The thickness of the precast diaphragm wall (1) is T The width of the prefabricated horizontal support (10) is B 1. The groove width of the pre-embedded part opening (4) along the width direction of the precast diaphragm wall (1) is... B 2. The hole (4) of the diaphragm wall pre-embedded part is located inside the precast diaphragm wall (1). The groove depth does not exceed 0.5 times the thickness T of the precast diaphragm wall (1). The groove width B2 is 0.4 to 0.6 times the width B1 of the precast horizontal support (10).

3. The error-adjustable prefabricated underground structure wall support node according to claim 1, characterized in that: The horizontal support embedding section of the joint connecting steel (13) is provided with anchor bars (14), which are fixedly connected to the outer side of the flange of the joint connecting steel (13) to enhance the anchoring performance of the joint connecting steel (13) in the prefabricated horizontal support (10).

4. The error-adjustable prefabricated underground structure wall support node according to claim 1, characterized in that: The anchoring structure of the pre-embedded connector (5) includes a pre-embedded stiffening rib (6) and a connector anchoring bar (7). The pre-embedded stiffening rib (6) is used to strengthen the structural rigidity of the pre-embedded connector (5), and the connector anchoring bar (7) is used to enhance the embedding strength of the pre-embedded connector (5) in the prefabricated diaphragm wall (1).

5. The error-adjustable prefabricated underground structure wall support node according to claim 4, characterized in that: The embedded part groove (8) of the pre-embedded connector (5) is used to realize the lateral error adjustment of the wall panel node along the horizontal support (10). The embedded part groove (8) has a toothed cross section with one side straight and the other side inclined. Multiple grooves are arranged in parallel along the thickness direction of the prefabricated diaphragm wall (1).

6. The error-adjustable prefabricated underground structure wall support node according to claim 1, characterized in that: The movable connector (16) includes a connecting screw (17), a connector back plate (18), a fastening nut (19), a bolt washer (20), and a connector tooth groove (21). The connecting screw (17) passes through the steel opening (15) of the connector connecting steel (13), and the connector tooth groove (21) forms a selectable snap-fit ​​with the embedded tooth groove (8) of the embedded connector (5).

7. The error-adjustable prefabricated underground structure wall support node according to claim 1, characterized in that: After the precast diaphragm wall (1) is connected to the precast horizontal support (10), self-compacting concrete (23) is poured into the embedded connector (5) and post-construction concrete (22) is poured at the node. The lengths of the self-compacting concrete (23) and the post-construction concrete (22) at the node along the direction of the precast horizontal support (10) are respectively L 3 and L 4.

8. The error-adjustable prefabricated underground structure wall support node according to claim 1, characterized in that: It also includes a temporary support bracket (24), which is composed of a bracket top steel plate (25), a bracket side steel plate (26), a bracket support square steel (33) and a bracket fixing bolt (27). A low-friction sliding plate (28) is provided on the upper side of the bracket top steel plate (25).

9. The error-adjustable prefabricated underground structure wall support node according to claim 1, characterized in that: The temporary support bracket is fixedly provided with an inner end plate (29) of the screw and a matching outer end plate (30) of the screw. The outer end plate (30) of the screw is arranged opposite to the inner end plate (29) of the screw. The outer end plate (30) of the screw is connected to the inner end plate (29) of the screw through screw 1 (31) and screw 2 (32).

10. A construction method for prefabricated underground structural panel wall joints with adjustable error, characterized in that: Includes the following steps: S1. Hoist the precast diaphragm wall (1) to the design position. After accurate positioning, open the pre-embedded connector cover plate (9) at the pre-embedded opening (4) of the diaphragm wall inside the precast diaphragm wall (1). S2. Fix the temporary support bracket (24) to the inside of the precast diaphragm wall (1); S3. Rotate the movable connector (16) to the direction before insertion so that it passes through the steel opening (15) at the end of the connector connecting steel (13). S4. Use movable tooling or gantry crane to hoist the prefabricated horizontal support (10) into place, so that the joint connecting steel (13) is inserted into the pre-embedded opening (4) of the prefabricated diaphragm wall (1); S5. Insert screw 1 (31) and screw 2 (32) into the inner end plate (29) and outer end plate (30) of the screw. By adjusting the position of the screw, move the prefabricated horizontal support (10) in the horizontal direction. Adjust the horizontal position of the joint connecting steel (13) in the pre-embedded opening (4) of the diaphragm wall to adjust the lateral construction error of the wall joint. S6. After the lateral error of the precast diaphragm wall (1) is eliminated, the movable connector (16) is rotated to the direction after insertion so that it forms a snap-fit ​​with the toothed structure (8) of the pre-embedded connector (5); S7. Adjust the engagement position of the movable connector (16) on the toothed structure (8) in the vertical direction to eliminate the vertical construction error of the wall panel node; S8. Secure the movable connector (16) to the embedded connector (5) by tightening the fastening nut (19); S9. Remove the temporary support bracket (24) and lead screw 1 (31), lead screw 2 (32) and lead screw outer end plate (30); S10. Inject self-compacting concrete into the pre-embedded opening (4) of the diaphragm wall, and pour concrete (22) after pouring the joint in the exposed area of ​​the joint connecting steel (13) to complete the joint construction.

Images