Replaceable large-diameter shield tunnel prefabricated mid-partition wall top node structure and construction method thereof

Abstract

This invention provides a replaceable top node structure for a prefabricated central partition wall in a large-diameter shield tunnel and its construction method. The node structure includes a flexible pad layer disposed between the top surface of the prefabricated central partition wall and the shield tunnel segment, and four sets of connecting components. Each set of connecting components includes an L-shaped connecting steel plate, vertical connecting bolts, horizontal connecting bolts, a first groove-type embedded part pre-embedded in the top shield tunnel segment, and a second groove-type embedded part pre-embedded in the prefabricated central partition wall. One side of the L-shaped connecting steel plate is connected to the top shield tunnel segment via vertical connecting bolts; the other side is connected to the prefabricated central partition wall via horizontal connecting bolts. The bolt heads of the vertical and horizontal connecting bolts are inserted into and slidably embedded into the grooves of the corresponding groove-type embedded parts through corresponding bolt mounting holes. This invention improves the construction accuracy and efficiency of the top node of the central partition wall and enables replacement during operation, which is of great significance for the construction of the top node of prefabricated central partition walls.

Description

Technical Field

[0001] This invention relates to the field of construction technology for partition walls in large-diameter shield tunnels, and in particular to the top node structure of prefabricated partition walls in large-diameter shield tunnels and its construction method. Background Technology

[0002] With the development of underground structure technology, large-diameter shield tunnels have been used in many subway and suburban rail projects. In order to meet the requirements of fire rescue and other aspects, a central partition wall must be installed in the middle of the tunnel between the up and down lines to divide the circular shield tunnel into two independent compartments for the operation of vehicles in both directions, that is, to adopt a single-tunnel double-track operation mode.

[0003] Traditional cast-in-place central partition wall construction methods are extremely complex, time-consuming, and inefficient. Furthermore, the extensive use of supports and formwork during construction severely hinders tunnel passage. Therefore, partial prefabrication and partial cast-in-place central partition wall solutions or fully prefabricated shield tunnels have emerged. Both methods involve the splicing of the prefabricated central partition wall with the tunnel segments. The top node of the central partition wall is a crucial component of the central partition wall in large-diameter single-tube double-track tunnels; its construction efficiency determines the operational safety of the central partition wall. Failure of the top node results in high replacement and maintenance costs.

[0004] In current construction processes, circular shield tunnels are assembled from segments, and these segments are subjected to external water and soil pressure. A circular structure offers more rational stress distribution and faster construction. To avoid the central partition wall disrupting the segment's load-bearing system, the wall structure is generally constructed after the segments are assembled. This requires establishing a connection between the vertical central partition wall and the tunnel body, leaving a space between the top of the wall and the segment to be filled with flexible material. Currently, the connection between the top of the central partition wall and the segment uses a "π"-shaped component, with partial cast-in-place reinforcement at the top; or drilling holes in the segment for rebar or bolt installation, followed by the installation of L-shaped connecting steel plates on both sides. These connection methods have the following disadvantages:

[0005] (1) The existing connection method requires on-site drilling and rebar installation or local on-site casting. Drilling holes on the already assembled pipe segments will inevitably cause some damage to the pipe segments. Moreover, the construction quality of the rebar adhesive is difficult to control due to gravity, which seriously affects the construction efficiency.

[0006] (2) The working area inside the tunnel is small and the working environment is poor. The secondary drilling and on-site pouring and installation are complicated and have a long cycle.

[0007] (3) Due to the fatigue of the connecting bolts and steel structure of the top connection node of the partition wall during long-term use, it is easy to cause safety hazards in the connection. However, the existing connection methods are all fixed connections, and the bolts and connectors are anchored. It is difficult to disassemble and reassemble after connection, and it is difficult to replace in the subsequent operation and maintenance process.

[0008] Therefore, how to obtain a top node of the partition wall that is easy to construct, has high construction efficiency, and can be replaced during operation is a major challenge at present. Summary of the Invention

[0009] To address the shortcomings of the aforementioned prefabricated partition wall top node design for large-diameter shield tunnels and the complex construction procedures, this application aims to provide a replaceable prefabricated partition wall top node structure and its construction method for large-diameter shield tunnels. This method simplifies the construction sequence of the partition wall top node, improves the construction accuracy and efficiency of the partition wall top node, and enables replacement during operation, which is of great significance for the construction of prefabricated partition wall top nodes.

[0010] To achieve the above-mentioned technical objectives, the present invention provides a replaceable top node structure for a prefabricated intermediate partition wall in a large-diameter shield tunnel, comprising a top shield tunnel segment and a prefabricated intermediate partition wall. The node structure is located at the connection point between the top of the prefabricated intermediate partition wall and the top shield tunnel segment, and is used to connect the top of the prefabricated intermediate partition wall and the top shield tunnel segment. The node structure includes a flexible pad layer disposed between the top surface of the prefabricated intermediate partition wall and the shield tunnel segment, and four sets of connecting components disposed at the four corners on both sides of the prefabricated intermediate partition wall. Each set of connecting components includes an L-shaped connecting steel plate, vertical connecting bolts, horizontal connecting bolts, a first groove-type embedded part pre-embedded in the top shield tunnel segment, and a second groove-type embedded part pre-embedded in the prefabricated intermediate partition wall. The groove opening of the first groove-type embedded part is lower than or flush with the inner arc surface of the top shield tunnel segment. A second groove-type embedded part is reserved at the positions corresponding to both ends of the groove opening of the first groove-type embedded part on the inner arc surface of the top shield tunnel segment. A bolt mounting slot is provided on the side of the prefabricated partition wall, and the slot is flush with or lower than the side of the prefabricated partition wall. Second bolt mounting slots are reserved at both ends of the second slot on the side of the prefabricated partition wall corresponding to the slots of the second slot-type embedded parts. One side of the L-shaped connecting steel plate is connected to the top shield tunnel segment by a vertical connecting bolt. The bolt head of the vertical connecting bolt is inserted through the first bolt mounting slot and slidably embedded into the groove of the first slot-type embedded part. The bolt rod of the vertical connecting bolt passes through the corresponding bolt hole on the L-shaped connecting steel plate and is then fixed and locked by a first nut. The other side of the L-shaped connecting steel plate is connected to the prefabricated partition wall by a horizontal connecting bolt. The bolt head of the horizontal connecting bolt is inserted through the second mounting slot and slidably embedded into the groove of the second slot-type embedded part. The bolt rod of the horizontal connecting bolt passes through the corresponding bolt hole on the L-shaped connecting steel plate and is then fixed and locked by a second nut.

[0011] The preferred technical solution of the present invention is as follows: the first bolt mounting slot and the groove of the first groove-type embedded part are on the same straight line and are interconnected; the width of the first bolt mounting slot and the groove of the first groove-type embedded part are both matched with the bolt head diameter of the vertical connecting bolt; the second bolt mounting slot and the groove of the second groove-type embedded part are on the same straight line and are interconnected; the width of the second bolt mounting slot and the groove of the second groove-type embedded part are both matched with the bolt head diameter of the horizontal connecting bolt.

[0012] The preferred technical solution of the present invention is as follows: the second groove-type embedded parts on both sides of the same corner of the prefabricated partition wall are connected as one unit by tie rods, and the tie rods are provided as one, two or more; the four sets of first groove-type embedded parts on the top shield tunnel segments all include a groove part and an anchor rod part, and the anchor rod part and the groove part are integral structures.

[0013] The preferred technical solution of the present invention is as follows: the flexible pad layer is made of high-density EVA sponge, and after the four sets of connecting components are installed, it is filled in the gap between the prefabricated partition wall and the top shield tunnel segment, and the two sides of the flexible pad layer are sealed with fireproof sealing strips; an elastic rubber pad is provided between the L-shaped connecting steel plate and the prefabricated partition wall; an epoxy adhesive layer is applied to the connecting surface between the L-shaped connecting steel plate and the top shield tunnel segment.

[0014] The preferred technical solution of the present invention is as follows: the two connecting surfaces of the L-shaped connecting steel plate are respectively provided with a first elongated hole and a second elongated hole, the screw of the vertical connecting bolt passes through the first elongated hole of the L-shaped connecting steel plate, and the screw of the horizontal connecting bolt passes through the second elongated hole of the L-shaped connecting steel plate.

[0015] The preferred technical solution of the present invention is as follows: the first groove-type embedded part is embedded in the tunnel segment during the casting of the top shield tunnel segment, and the second groove-type embedded part is embedded in the prefabricated partition wall during the casting of the prefabricated partition wall; and before the casting of the top shield tunnel segment and the prefabricated partition wall, the grooves of the first groove-type embedded part and the second groove-type embedded part are sealed with sponge, and the sponge is removed after the casting is completed to ensure that the channel is not blocked during the casting.

[0016] The preferred technical solution of the present invention is as follows: the length of the vertical connecting bolt extending beyond the L-shaped connecting steel plate is no more than 50mm, and the length of the horizontal connecting bolt extending beyond the L-shaped connecting steel plate is no more than 20mm; after the vertical connecting bolt and the horizontal connecting bolt are installed, the first bolt mounting slot and the second bolt mounting slot are sealed with putty.

[0017] The present invention also provides a construction method for a replaceable prefabricated intermediate partition wall top node structure for large-diameter shield tunnels, the specific steps of which are as follows:

[0018] S1. A first groove-type embedded part is pre-embedded in the top shield tunnel segment where the top node structure is to be installed. The first groove-type embedded part is cast together with the shield tunnel segment. A second groove-type embedded part is pre-embedded at the corresponding position of the prefabricated partition wall. The second groove-type embedded part is cast together with the partition wall. Before pouring concrete for the shield tunnel segment and the prefabricated partition wall, the grooves of the first groove-type embedded part and the second groove-type embedded part are filled with flexible material. The filling material is removed after pouring to ensure that the channel is not blocked during pouring. Bolt installation ports are reserved at both ends of the first groove-type embedded part and the second groove-type embedded part during pouring.

[0019] S2. After the shield tunnel segment construction is completed and the prefabricated partition wall is assembled in place, insert the vertical connecting bolts along the corresponding bolt installation holes on the shield tunnel segment and slide them into the corresponding first groove embedded parts. Insert the horizontal connecting bolts along the corresponding bolt installation holes on the embedded partition wall and slide them into the corresponding second groove embedded parts. Then seal the bolt installation holes at both ends of the first groove embedded parts and the second embedded parts.

[0020] S3. Adhere elastic rubber pads to the contact surfaces between each L-shaped connecting steel plate and the prefabricated partition wall, leaving the bolt hole positions on the L-shaped connecting steel plate unattended during the pasting process;

[0021] S4. After passing the L-shaped connecting steel plate through the corresponding vertical connecting bolts and horizontal connecting bolts, the L-shaped connecting steel plate is bonded to the shield tunnel segment. The nuts of the vertical connecting bolts and horizontal connecting bolts are then installed to fix the L-shaped connecting steel plate to the shield tunnel segment and the prefabricated partition wall.

[0022] S5. Fill the gap between the prefabricated partition wall and the shield tunnel segment with flexible material and seal it with fireproof sealing strips; complete the construction of the connection node structure between the prefabricated partition wall and the shield tunnel segment.

[0023] The preferred technical solution of the present invention is as follows: After installing the vertical connecting bolts and the horizontal connecting bolts, use putty to fill the bolt mounting holes at both ends of the first groove-type embedded part and the second embedded part.

[0024] When the connecting bolts in the top node structure of the precast partition wall are damaged and need to be replaced, first loosen the vertical connecting bolts and nuts, then loosen the horizontal connecting bolts and nuts. After the L-shaped precast steel plate comes out of the bolts, pull out the putty filling on both sides of the grooved embedded part, then slide out the damaged connecting bolts and install the new bolts to complete the replacement of the top node.

[0025] The preferred technical solution of this invention is as follows: In step S4, epoxy adhesive is applied to the interface between each L-shaped connecting steel plate and the shield tunnel segment. The epoxy adhesive should be stirred evenly, and shaking is not allowed during the curing process. When installing the L-shaped connecting steel plate, the L-shaped connecting steel plate is lifted using prefabricated partition wall assembly equipment. First, the vertical connecting bolts are passed through the L-shaped connecting steel plate, then the horizontal connecting bolts are passed through the L-shaped connecting steel plate. After that, the L-shaped connecting steel plate is lifted to be close to the shield tunnel segment, and the vertical connecting bolts are fixed and locked with nuts. In step S5, the flexible padding layer is made of high-density EVA sponge.

[0026] The beneficial effects of this application are:

[0027] 1. This invention avoids on-site drilling and rebar installation by setting short groove-type embedded parts on the top of the shield tunnel segments and the central partition wall, and using L-shaped connecting steel plates. This enables the replacement of the top nodes of the central partition wall during later maintenance, and increases the stability of the connection between the central partition wall and the tunnel segments.

[0028] 2. In the construction of this invention, the short groove type embedded part slide is used in conjunction with the long hole reserved in the L-shaped connecting steel plate, which can accommodate the large installation error of the top node of the middle partition wall and ensure the construction accuracy of the top node of the middle partition wall.

[0029] 3. This invention rationally sets the construction sequence of the top nodes of the partition wall, simplifies the construction process of the top nodes of the partition wall, and effectively improves the construction accuracy and quality.

[0030] This invention simplifies the construction sequence of the top node of the central partition wall, improves the construction accuracy and efficiency of the top node of the central partition wall, can effectively improve construction efficiency, ensure construction accuracy, and meet the replacement needs during operation, which is of great significance to the construction of the top node of the prefabricated central partition wall. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the cross-sectional structure of the top node structure in this invention;

[0032] Figure 2 for Figure 1 Diagram of direction A in the middle;

[0033] Figure 3 for Figure 2 BB section view;

[0034] Figure 4 for Figure 2 CC section view;

[0035] Figure 5 This is a schematic diagram of the tunnel cross-section according to an embodiment of the present invention.

[0036] In the diagram: 1—Top shield tunnel segment, 2—Precast central partition wall, 3—First groove-type embedded part, 4—Second groove-type embedded part, 5—L-shaped connecting steel plate, 6—Elastic rubber pad, 7—Horizontal elongated hole, 8—Vertical elongated hole, 9—Vertical connecting bolt, 10—Horizontal connecting bolt, 11—First bolt mounting slot, 12—Second bolt mounting slot, 13—Epoxy adhesive, 14—First nut, 15—Second nut, 16—Flexible pad, 17—Fireproof sealing strip, 18—Tie rod. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 5 All accompanying drawings are simplified versions of embodiments and are intended only to clearly and concisely illustrate the embodiments of the present invention. The technical solutions shown in the drawings below are specific solutions of embodiments of the present invention and are not intended to limit the scope of the claimed invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] The embodiment provides a replaceable top node structure for the prefabricated intermediate partition wall of a large-diameter shield tunnel, such as... Figures 1 to 5As shown, the structure includes a top shield tunnel segment 1 and a prefabricated central partition wall 2. The node structure is located at the connection between the top of the prefabricated central partition wall 2 and the top shield tunnel segment 1, and is used to connect the top of the prefabricated central partition wall 2 and the top shield tunnel segment 1. The node structure includes a flexible pad 16 disposed between the top surface of the prefabricated central partition wall 2 and the shield tunnel segment 1, and four sets of connecting components disposed at the four corners on both sides of the prefabricated central partition wall 2. Each set of connecting components includes an L-shaped connecting steel plate 5, a vertical connecting bolt 9, and a horizontal connecting bolt 10. The first groove-type embedded part 3 is embedded in the top shield tunnel segment 1 and the second groove-type embedded part 4 is embedded in the prefabricated intermediate partition wall 2. The first groove-type embedded part 3 is embedded in the segment during the pouring of the top shield tunnel segment 1, and the second groove-type embedded part 4 is embedded in the prefabricated intermediate partition wall 2 during the pouring of the prefabricated intermediate partition wall 2. Before the pouring of the top shield tunnel segment 1 and the prefabricated intermediate partition wall 2, the grooves of the first groove-type embedded part 3 and the second groove-type embedded part 4 are sealed with sponge. After the pouring is completed, the sponge is removed to ensure that the channel is not blocked during the pouring. The groove of the first channel-type embedded part 3 is lower than or flush with the inner arc surface of the top shield tunnel segment 1. First bolt mounting slots 11 are reserved at the positions corresponding to both ends of the groove of the first channel-type embedded part 3 on the inner arc surface of the top shield tunnel segment 1. The groove of the second channel-type embedded part 4 is located on the side of the prefabricated intermediate partition wall 2, and the groove is flush with or lower than the side of the prefabricated intermediate partition wall 2. First bolt mounting slots 11 are reserved at the positions corresponding to both ends of the groove of the second channel-type embedded part 4 on the side of the prefabricated intermediate partition wall 2. The second bolt mounting slot 12; the first bolt mounting slot 11 and the groove of the first groove-type embedded part 3 are on the same straight line and are interconnected. The width of the first bolt mounting slot 11 and the groove of the first groove-type embedded part 3 are both matched with the bolt head diameter of the vertical connecting bolt 9; the second bolt mounting slot 12 and the groove of the second groove-type embedded part 4 are on the same straight line and are interconnected. The width of the second bolt mounting slot 12 and the groove of the second groove-type embedded part 4 are both matched with the bolt head diameter of the horizontal connecting bolt 10.

[0040] In the embodiments, such as Figures 1 to 5As shown, the two connecting surfaces of the L-shaped connecting steel plate 5 are respectively provided with a first elongated hole 7 and a second elongated hole 8. One side of the L-shaped connecting steel plate 5 is connected to the top shield tunnel segment 1 by a vertical connecting bolt 9. The bolt head of the vertical connecting bolt 9 is inserted into and slidably embedded in the groove of the first groove-type pre-embedded part 3 through the first bolt mounting slot 11. The screw of the vertical connecting bolt 9 passes through the first elongated hole 7 on the L-shaped connecting steel plate 5 and is then fixed and locked by the first nut 14. The other side of the L-shaped connecting steel plate 5 is connected to the prefabricated intermediate partition wall 2 by a horizontal connecting bolt 10. The bolt head of the horizontal connecting bolt 10 is inserted into and slidably embedded in the groove of the second groove-type pre-embedded part 4 through the second mounting slot 12. The screw of the horizontal connecting bolt 10 passes through the second elongated hole 8 on the L-shaped connecting steel plate 5 and is then fixed and locked by the second nut 15. The vertical connecting bolt 9 extends no more than 50mm beyond the L-shaped connecting steel plate 5, and the horizontal connecting bolt 10 extends no more than 20mm beyond the L-shaped connecting steel plate 5. After the vertical connecting bolt 9 and the horizontal connecting bolt 10 are installed, the first bolt mounting slot 11 and the second bolt mounting slot 12 are sealed with putty.

[0041] In the embodiments, such as Figures 1 to 5 As shown, the second groove-type embedded parts 4, which are pre-embedded on both sides of the same corner of the prefabricated partition wall 2, are connected as a whole by tie rods 18. The tie rods 18 have one, two, or more. The four sets of first groove-type embedded parts 3, which are pre-embedded on the top shield tunnel segment 1, all include a groove part and an anchor rod part, and the anchor rod part and the groove part are integrally structured. The flexible pad 16 is made of high-density EVA sponge, and after the four sets of connecting components are installed, it is filled in the gap between the prefabricated partition wall 2 and the top shield tunnel segment 1. The two sides of the flexible pad 16 are sealed with fireproof sealing strips 17. An elastic rubber pad 6 is provided between the L-shaped connecting steel plate 5 and the prefabricated partition wall 2. The connecting surface of the L-shaped connecting steel plate 5 and the top shield tunnel segment 1 is coated with an epoxy adhesive layer.

[0042] The construction method for the replaceable top node structure of the prefabricated partition wall in a large-diameter shield tunnel, as described in this embodiment, specifically includes the following steps:

[0043] S1. Embed the first groove-type embedded part 3 in the top shield tunnel segment 1 where the top node is to be installed, and cast it together with the shield tunnel segment; embed the second groove-type embedded part 4 in the top of the precast intermediate partition wall 2, and cast it together with the precast intermediate partition wall 2; the specific embedding steps are as follows:

[0044] ① According to the design axis of the top node of the prefabricated partition wall, the first groove connector 3 is pre-embedded in the inner arc surface of the top shield tunnel segment 1 to be assembled. The groove needs to be slightly lower than the inner arc surface of the top shield tunnel segment 1. The first bolt installation groove 11 for installing the vertical connecting bolt 9 is reserved at both ends of the first groove connector 3. At the same time, the groove of the connector and the gap at both ends are sealed with sponge. The sponge is removed after the pouring is completed.

[0045] ② The top four corners of the prefabricated partition wall 2 are pre-embedded with second groove connectors 4. The grooves should be slightly lower than the wall surface of the prefabricated partition wall 2. The second bolt installation slots 12 for installing horizontal connecting bolts 10 are reserved at both ends of the second groove connectors 4. At the same time, the grooves of the connectors and the second bolt installation slots 12 at both ends are sealed with sponge. The sponge is removed after the pouring is completed.

[0046] S2. After the shield tunnel segment assembly is completed and the prefabricated partition wall 2 is assembled in place, insert the vertical connecting bolt 9 along the corresponding first bolt installation slot 11 on the shield tunnel segment and slide it into the corresponding first groove type embedded part 3. Insert the horizontal connecting bolt 10 along the corresponding second bolt installation slot 12 on the embedded partition wall and slide it into the corresponding second groove type embedded part 4. Then fill and seal the bolt installation ports at both ends of the first groove type embedded part 3 and the second embedded part 4 with putty.

[0047] S3. A first long hole 7 is made on the side of the L-shaped connecting steel plate 5 that contacts the shield tunnel segment, and a second long hole 8 is made on the side that contacts the prefabricated central partition wall 2; an elastic rubber pad 6 is pasted on the inner side of the contact surface between each L-shaped connecting steel plate 5 and the prefabricated central partition wall 2, and the position of the long hole is left empty.

[0048] S4. Apply epoxy adhesive 13 to the side of the L-shaped connecting steel plate 5 that contacts the shield tunnel segment, adjust the position by sliding grooves, pass the L-shaped connecting steel plate 5 through the vertical connecting bolt 9 and the horizontal connecting bolt 10 respectively, so that the L-shaped connecting steel plate 5 is bonded to the shield tunnel segment, and install the nuts of the vertical connecting bolt 9 and the horizontal connecting bolt 10 to fix the L-shaped connecting steel plate 5 to the prefabricated partition wall 2.

[0049] The specific installation steps in step S4 above include:

[0050] ① Apply epoxy adhesive 13 to the side of the L-shaped connecting steel plate 5 that contacts the shield tunnel segment, and use the assembly equipment to lift the L-shaped connecting steel plate 5 so that the vertical connecting bolt 9 passes through the first long hole 7 on the L-shaped connecting steel plate 5.

[0051] ② Adjust the position of the horizontal connecting bolt 10, and then the lifting equipment will pass the second long hole 8 of the L-shaped connecting steel plate 5 through the horizontal connecting bolt 10;

[0052] ③ Then, the L-shaped connecting steel plate 5 is vertically lifted to the top tunnel segment, so that the L-shaped connecting steel plate 5 is firmly bonded to the top shield tunnel segment 1;

[0053] ④ Tighten the nuts of the vertical connecting bolt 9 and the horizontal connecting bolt 10 to fix the L-shaped connecting steel plate 5 to the prefabricated partition wall 2, ensuring that it does not move.

[0054] S5. Fill the gap between the prefabricated partition wall 2 and the top shield segment 1 with customized high-density EVA sponge, and then seal both sides of the sponge with fireproof sealing strip 17;

[0055] S6. When it is necessary to disassemble or replace the top node, first loosen the nuts of the vertical connecting bolts 9, then loosen the nuts of the horizontal connecting bolts, move the L-shaped connecting steel plate 5 and remove it, pull out the putty filling on both sides of the embedded part, then slide out the connecting bolts that need to be replaced and install the new bolts to complete the replacement of the top node.

[0056] Those skilled in the art will readily make various modifications to this embodiment and apply the general principles described herein to other embodiments without inventive effort. Therefore, this application is not limited to the above-described embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from its scope should be within the protection scope of this application.

Claims

1. A replaceable top node structure for a prefabricated intermediate partition wall in a large-diameter shield tunnel, comprising a top shield segment (1) and a prefabricated intermediate partition wall (2), wherein the node structure is located at the connection point between the top of the prefabricated intermediate partition wall (2) and the top shield segment (1), and is used to connect the top of the prefabricated intermediate partition wall (2) and the top shield segment (1), characterized in that: The node structure includes a flexible pad (16) set between the top surface of the prefabricated partition wall (2) and the shield segment (1) and four sets of connecting components set at the four top corners on both sides of the prefabricated partition wall (2). Each set of connecting components includes an L-shaped connecting steel plate (5), a vertical connecting bolt (9), a horizontal connecting bolt (10), a first groove-type embedded part (3) embedded in the top shield segment (1), and a second groove-type embedded part (4) embedded in the prefabricated partition wall (2). The groove of the first groove-type embedded part (3) is lower than or flush with the inner arc surface of the top shield tunnel segment (1). First bolt mounting grooves (11) are reserved at the positions corresponding to the two ends of the groove of the first groove-type embedded part (3) on the inner arc surface of the top shield tunnel segment (1). The groove of the second groove-type embedded part (4) is set on the side of the prefabricated partition wall (2), and the groove is flush with or lower than the side of the prefabricated partition wall (2). On the side of the prefabricated partition wall (2), at the positions corresponding to the two ends of the groove of the second groove-type embedded part (4), a second bolt installation groove (12) is reserved respectively; one side of the L-shaped connecting steel plate (5) is connected to the top shield segment (1) by a vertical connecting bolt (9), the bolt head of the vertical connecting bolt (9) is inserted into and slidably embedded in the groove of the first groove-type embedded part (3) through the first bolt installation groove (11), and the screw of the vertical connecting bolt (9) passes through the corresponding screw hole on the L-shaped connecting steel plate (5) and is fixed and locked by the first nut (14); the other side of the L-shaped connecting steel plate (5) is connected to the prefabricated partition wall (2) by a horizontal connecting bolt (10), the bolt head of the horizontal connecting bolt (10) is inserted into and slidably embedded in the groove of the second groove-type embedded part (4) through the second installation groove (12), and the screw of the horizontal connecting bolt (10) passes through the corresponding screw hole on the L-shaped connecting steel plate (5) and is fixed and locked by the second nut (15).

2. The replaceable large-diameter shield tunnel prefabricated partition wall top node structure according to claim 1, characterized in that: The first bolt mounting slot (11) and the groove of the first groove-type embedded part (3) are on the same straight line and are interconnected. The width of the first bolt mounting slot (11) and the groove of the first groove-type embedded part (3) are both matched with the bolt head diameter of the vertical connecting bolt (9). The second bolt mounting slot (12) and the groove of the second groove-type embedded part (4) are on the same straight line and are interconnected. The width of the second bolt mounting slot (12) and the groove of the second groove-type embedded part (4) are both matched with the bolt head diameter of the horizontal connecting bolt (10).

3. A replaceable top node structure for a prefabricated intermediate partition wall in a large-diameter shield tunnel according to claim 1 or 2, characterized in that: The second groove-type embedded parts (4) embedded on both sides of the same corner of the prefabricated partition wall (2) are connected as one unit by tie rods (18). The tie rods (18) are provided with one, two or more. The four sets of first groove-type embedded parts (3) embedded on the top shield tunnel segment (1) all include a groove part and an anchor rod part, and the anchor rod part and the groove part are an integral structure.

4. A replaceable large-diameter shield tunnel prefabricated partition wall top node structure according to claim 1 or 2, characterized in that: The flexible pad (16) is made of high-density EVA sponge, and after the four sets of connecting components are installed, it is filled in the gap between the prefabricated partition wall (2) and the top shield segment (1), and the two sides of the flexible pad (16) are sealed with fireproof sealing strips (17); an elastic rubber pad (6) is provided between the L-shaped connecting steel plate (5) and the prefabricated partition wall (2); the connecting surface of the L-shaped connecting steel plate (5) and the top shield segment (1) is coated with an epoxy adhesive layer.

5. A replaceable large-diameter shield tunnel prefabricated partition wall top node structure according to claim 1 or 2, characterized in that: The two connecting surfaces of the L-shaped connecting steel plate (5) are respectively provided with a first long hole (7) and a second long hole (8). The screw of the vertical connecting bolt (9) passes through the first long hole (7) on the L-shaped connecting steel plate (5), and the screw of the horizontal connecting bolt (10) passes through the second long hole (8) on the L-shaped connecting steel plate (5).

6. A replaceable large-diameter shield tunnel prefabricated intermediate partition wall top node structure according to claim 1 or 2, characterized in that: The first groove-type embedded part (3) is embedded in the top shield tunnel segment (1) during the casting process, and the second groove-type embedded part (4) is embedded in the prefabricated partition wall (2) during the casting process. Before the top shield tunnel segment (1) and the prefabricated partition wall (2) are cast, the grooves of the first groove-type embedded part (3) and the second groove-type embedded part (4) are sealed with sponge. After the casting is completed, the sponge is removed to ensure that the channel is not blocked during the casting process.

7. A replaceable large-diameter shield tunnel prefabricated partition wall top node structure according to claim 1 or 2, characterized in that: The length of the vertical connecting bolt (9) extending beyond the L-shaped connecting steel plate (5) shall not exceed 50mm, and the length of the horizontal connecting bolt (10) extending beyond the L-shaped connecting steel plate (5) shall not exceed 20mm. After the vertical connecting bolt (9) and the horizontal connecting bolt (10) are installed, the first bolt mounting slot (11) and the second bolt mounting slot (12) are sealed with putty.

8. A construction method for the top node structure of the replaceable prefabricated intermediate partition wall in a large-diameter shield tunnel as described in any one of claims 1 to 7, characterized in that, The specific steps are as follows: S1. A first groove-type embedded part is pre-embedded in the top shield tunnel segment where the top node structure is to be installed. The first groove-type embedded part is cast together with the shield tunnel segment. A second groove-type embedded part is pre-embedded at the corresponding position of the prefabricated partition wall. The second groove-type embedded part is cast together with the partition wall. Before pouring concrete for the shield tunnel segment and the prefabricated partition wall, the grooves of the first groove-type embedded part and the second groove-type embedded part are filled with flexible material. The filling material is removed after pouring to ensure that the channel is not blocked during pouring. Bolt installation ports are reserved at both ends of the first groove-type embedded part and the second groove-type embedded part during pouring. S2. After the shield tunnel segment construction is completed and the prefabricated partition wall is assembled in place, insert the vertical connecting bolts along the corresponding bolt installation holes on the shield tunnel segment and slide them into the corresponding first groove embedded parts. Insert the horizontal connecting bolts along the corresponding bolt installation holes on the embedded partition wall and slide them into the corresponding second groove embedded parts. Then seal the bolt installation holes at both ends of the first groove embedded parts and the second embedded parts. S3. Adhere elastic rubber pads to the contact surfaces between each L-shaped connecting steel plate and the prefabricated partition wall, leaving the bolt hole positions on the L-shaped connecting steel plate unattended during the pasting process; S4. After passing the L-shaped connecting steel plate through the corresponding vertical connecting bolts and horizontal connecting bolts, the L-shaped connecting steel plate is bonded to the shield tunnel segment. The nuts of the vertical connecting bolts and horizontal connecting bolts are then installed to fix the L-shaped connecting steel plate to the shield tunnel segment and the prefabricated partition wall. S5. Fill the gap between the prefabricated partition wall and the shield tunnel segment with flexible material and seal it with fireproof sealing strips; complete the construction of the connection node structure between the prefabricated partition wall and the shield tunnel segment.

9. The construction method for a replaceable large-diameter shield tunnel prefabricated intermediate partition wall top node structure according to claim 8, characterized in that: After installing the vertical and horizontal connecting bolts, use putty to fill the bolt mounting holes at both ends of the first and second embedded parts. When the connecting bolts in the top node structure of the precast partition wall are damaged and need to be replaced, first loosen the vertical connecting bolts and nuts, then loosen the horizontal connecting bolts and nuts. After the L-shaped precast steel plate comes out of the bolts, pull out the putty filling on both sides of the embedded part, then slide out the damaged connecting bolts and install the new bolts to complete the replacement of the top node.

10. The construction method for a replaceable large-diameter shield tunnel prefabricated intermediate partition wall top node structure according to claim 8, characterized in that: In step S4, epoxy adhesive is applied to the interface between each L-shaped connecting steel plate and the shield tunnel segment. The epoxy adhesive should be stirred evenly, and shaking is not allowed during the curing process. When installing the L-shaped connecting steel plate, the prefabricated partition wall assembly equipment is used to lift the L-shaped connecting steel plate. First, the vertical connecting bolts are passed through the L-shaped connecting steel plate, and then the horizontal connecting bolts are passed through the L-shaped connecting steel plate. After that, the L-shaped connecting steel plate is lifted to be close to the shield tunnel segment, and the vertical connecting bolts are fixed and locked with nuts. The flexible padding layer mentioned in step S5 uses high-density EVA sponge.

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