Shield tunnel transverse passage split ring duct piece structure

Abstract

The utility model provides a shield tunnel transverse passage split ring duct piece structure which comprises a duct piece body and a prestress tension assembly, the duct piece body is provided with an opening for vehicles to enter and exit from a shield tunnel main hole, and the prestress tension assembly comprises a prestress anchor cable, a fixed end anchorage device and a tension end anchorage device. An annular guide pipe allowing the pre-stressed anchor cable to penetrate through is reserved in the pipe piece body, the pre-stressed anchor cable comprises an anchoring end and a tensioning end which are oppositely arranged in the extending direction of the pre-stressed anchor cable, the anchoring end is anchored to the upper wall face of the opening through a fixing end anchorage device, and the tensioning end penetrates through the annular guide pipe and then is connected with the tensioning end anchorage device. The tensioning end anchorage device is installed on the lower wall face of the opening so as to conduct tensioning operation on the pre-stressed anchor cable. Annular prestress can be applied to the duct piece in the annular direction through the prestress tensioning assembly, the overall rigidity of the structure is improved, the large deformation risk of the structure is reduced, the structural strength of the duct piece is guaranteed, and therefore the safety and feasibility of the vehicle transverse channel duct piece opening structure are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnels, in particular to an open ring segment structure of a vehicle transverse passage of a shield tunnel. Background Art

[0002] A shield tunnel is an assembled structure formed by connecting segments with bolts. The segments are assembled by annular bolts to form a closed ring structure to resist the ground pressure and ensure the stability of the surrounding rock. At present, there is no practical case of constructing a vehicle cross passage in shield tunnels, especially large-diameter shield tunnels across rivers and seas. Shield tunnels mainly construct pedestrian cross passages or do not have cross passages. Among them, small and medium-sized diameter shield tunnels (subways and intercity) are the majority. There are also few cases of constructing pedestrian cross passages in large-diameter shield tunnels on highways with a diameter of more than 10m. Except for the pilot projects of the jacking method and shield method for the pedestrian cross passages of some shield tunnels in China, other pedestrian cross passages mainly adopt the mining method to construct pedestrian cross passages. There is no mature solution for the construction of vehicle cross passages with large openings.

[0003] Due to the danger and complexity of large-area openings in shield tunnel segments, if large-area openings are made directly on the shield tunnel segments to construct vehicle cross passages, the segment openings will destroy the original closed ring structure, affecting the structural integrity, and greatly changing the stress state of the structure, causing annular axial force loss in the open ring segments. In the case of insufficient bolt anchoring force, the segment joints will open too much, causing large local deformation and instability of the segments, resulting in unbearable consequences.

[0004] In view of this, it is necessary to propose an open ring segment structure for a shield tunnel vehicle cross passage to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of the utility model is to provide an open ring segment structure for a shield tunnel vehicle cross passage, so as to solve the technical problem that there is no mature segment opening structure solution for the shield tunnel vehicle cross passage that requires a large opening in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides an open ring segment structure for a vehicle-carrying transverse passage of a shield tunnel, comprising a segment body and a prestressed tensioning assembly; wherein:

[0007] The segment body has an opening for vehicles to enter and exit the main hole of the shield tunnel;

[0008] The prestressed tensioning assembly comprises a prestressed anchor cable, a fixed end anchor, and a tensioning end anchor;

[0009] The segment body is provided with an annular guide tube for the prestressed anchor cable to pass through. The prestressed anchor cable includes an anchoring end and a tensioning end which are arranged opposite to each other along its own extension direction. The anchoring end is anchored to the upper wall surface of the opening through the fixed end anchor. The tensioning end is connected to the tensioning end anchor after passing through the annular guide tube. The tensioning end anchor is installed on the lower wall surface of the opening so as to perform tensioning operation on the prestressed anchor cable.

[0010] Preferably, the segment body comprises a plurality of segment rings which are sequentially spliced ​​along the extension direction of the main hole of the shield tunnel, and two adjacent segment rings are connected by oblique bolts.

[0011] Preferably, the upper wall surface of the opening is recessed toward the interior of the segment body to form a first anchor groove for placing the fixed end anchor, and the lower wall surface of the opening is recessed toward the interior of the segment body to form a second anchor groove for placing the tension end anchor.

[0012] Preferably, the first anchor groove and the second anchor groove are both cylindrical grooves, and the inner diameter of the cylindrical groove is greater than 200 mm and the depth is greater than 50 mm.

[0013] Preferably, each of the segment rings includes a capping block, a first adjacent block and a second adjacent block respectively spliced ​​on both sides of the capping block, a first standard block and a second standard block respectively located on both sides of the capping block, and a first special block and a second special block respectively located on both sides of the capping block, the first standard block is spliced ​​on the outside of the first adjacent block, the second standard block is spliced ​​on the outside of the second adjacent block, the first special block is spliced ​​on the outside of the first standard block, the second special block is spliced ​​on the outside of the second standard block, the first special block, the first standard block, the first adjacent block, the capping block, the second adjacent block, the second standard block and the second special block together form an annular closed segment structure; wherein the opening is arranged within the area corresponding to the first special block and the second special block.

[0014] Preferably, cross sections of the first special block, the first standard block, the first adjacent block, the capping block, the second adjacent block, the second standard block and the second special block are all fan-shaped.

[0015] Preferably, the arc center angle corresponding to the capping block is 12.9°, the arc center angles corresponding to the first adjacent block, the second adjacent block, the first standard block and the second standard block are all 38.6°, and the arc center angles corresponding to the first special block and the second special block are 25.7°.

[0016] Preferably, a first spiral rib is pre-buried inside the segment body on the side close to the fixed end anchor, and a second spiral rib is pre-buried inside the segment body on the side close to the tensioning end anchor, and both the first spiral rib and the second spiral rib are sleeved on the outside of the prestressed anchor cable.

[0017] Preferably, a plurality of the segment rings are assembled through seams along the extension direction of the main hole of the shield tunnel.

[0018] Preferably, the number of the segment rings is three.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides an open ring segment structure for a vehicle-carrying transverse passage of a shield tunnel, comprising a segment body and a prestressed tensioning assembly. The segment body has an opening for vehicles to enter and exit the main hole of the shield tunnel. The prestressed tensioning assembly comprises a prestressed anchor cable, a fixed end anchor, and a tensioning end anchor. The segment body is pre-reserved with an annular guide tube for the prestressed anchor cable to pass through. The prestressed anchor cable comprises an anchoring end and a tensioning end that are relatively arranged along its own extension direction. The anchoring end is anchored on the upper wall surface of the opening through the fixed end anchor. The tensioning end is connected to the tensioning end anchor after passing through the annular guide tube. The tensioning end anchor is installed on the lower wall surface of the opening so as to perform tensioning operations on the prestressed anchor cable. The present application can apply annular prestress to the segment in annular direction through the prestressed tensioning assembly, thereby increasing the overall rigidity of the structure, reducing the risk of large structural deformation, and ensuring the structural strength of the segment, thereby ensuring the safety and feasibility of the segment opening structure for the vehicle-carrying transverse passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the cross-sectional block structure of the segment ring in one embodiment of the utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the expanded structure;

[0024] Figure 3 This is a planar unfolded structural diagram of the second standard block B3 in one embodiment of the utility model;

[0025] Figure 4This is a schematic diagram of the central cross-sectional structure of the second standard block B3 in one embodiment of the utility model;

[0026] Figure 5 This is a planar expansion structural diagram of the first special block T3 in one embodiment of the utility model;

[0027] Figure 6 It is a schematic diagram of the central cross-sectional structure of the first special block T3 in one embodiment of the utility model.

[0028] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0029] Description of Figure Numbers:

[0030] 10. Segment body; 110. Opening; 111. Reserved hand hole; 112. First anchor groove; 113. Second anchor groove; 120. Segment ring; 121. Annular guide tube; 122. Capping block; 123. First adjacent block; 124. Second adjacent block; 125. First standard block; 126. Second standard block; 127. First special block; 128. Second special block; 20. Prestressed anchor cable; 210. Fixed end anchor; 220. Tension end anchor; 230. First spiral rib; 240. Second spiral rib; 250. Plastic corrugated pipe. DETAILED DESCRIPTION

[0031] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as described in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] It should be known to those skilled in the art that, currently, due to the danger and complexity of large-area openings in shield tunnel segments, shield tunnels, especially super-large diameter shield tunnels, only have pedestrian cross passages or no cross passages, and evacuation and rescue are carried out through evacuation stairs. In particular, the construction of vehicle cross passages in super-large diameter shield tunnels is a new issue facing the construction of urban highway shield tunnels. Its segment breaking, supporting structure, joint waterproofing, and seismic response are more complex and special than those of conventional shield tunnels. Its reasonable design and construction have become important technical problems faced by urban super-large diameter shield tunnel projects. Therefore, conducting research on related issues has important theoretical and engineering practical significance.

[0036] The main functions of the cross passage on the highway are: 1) The cross passage can be used for inspection, maintenance, rescue and vehicle change of driving direction. It is mainly for the rescue or fire trucks to detour to the nearest accident site when an accident occurs in one of the tunnels and traffic jam occurs, thereby improving the rescue efficiency; 2) When a fire occurs in the tunnel, vehicles downwind can continue to drive to the front exit, while vehicles upwind need to use tunnel auxiliary facilities for evacuation. For large shield tunnels in the central area of ​​the city, once an accident or fire hazard occurs, if firefighting and evacuation and rescue cannot be carried out in time, it will bring serious consequences. Therefore, it is extremely necessary to set up a cross passage in the tunnel.

[0037] Please see attached Figures 1 to 6 In one embodiment of the present invention, a shield tunnel opening 110 ring segment structure includes a segment body 10 and a prestressed tensioning assembly (not shown); wherein,

[0038] The segment body 10 has an opening 110 for vehicles to enter and exit the main tunnel of the shield tunnel; those skilled in the art should note that before the construction of the vehicle cross passage is completed, the segment of the main line of the shield tunnel is a complete ring-shaped structure, and the opening 110 is formed on the segment of the main tunnel of the shield tunnel, similar to opening a side door for vehicles to pass and for construction, so that the vehicle cross passage is finally constructed, and thus the opening 110 can be used for vehicles to enter and exit the main tunnel of the shield tunnel;

[0039] The prestressed tensioning assembly includes a prestressed anchor cable 20, a fixed end anchor 210, and a tensioning end anchor 220; the segment body 10 is reserved with an annular guide tube 121 for the prestressed anchor cable 20 to pass through, and the prestressed anchor cable 20 includes an anchoring end (not shown in the figure) and a tensioning end (not shown in the figure) arranged relatively along its own extension direction, and the anchoring end is anchored on the upper wall surface of the opening 110 through the fixed end anchor 210, and the tensioning end is connected to the tensioning end anchor 220 after passing through the annular guide tube 121, and the tensioning end anchor 220 is installed on the lower wall surface of the opening 110 so as to perform tensioning operations on the prestressed anchor cable 20.

[0040] Furthermore, hand holes 111 are reserved at the upper and lower ends of the corresponding pipe segments at the opening 110 for tensioning the prestressed anchor cable 20. The prestress can be applied without removing the pipe segments at the opening 110. After the axial force compensation of the structure is completed, the pipe segments at the opening 110 can be removed to make the construction process safer and the structure more stable. The width direction of the hand hole needs to include the space reserved for the anchor slot (at least 2m), and the length direction needs to meet the space required for tensioning the prestressed anchor cable 20 (at least 1m).

[0041] It is worth noting that in this embodiment, the axial force of the prestressed anchor cable 20 is used to compensate for the annular axial force loss caused by the opening 110. Figure 1 , 4 -6, the prestressed anchor cable 20 can be wrapped with a plastic corrugated tube 250 and inserted into the annular guide tube 121 of the upper end segment of the opening 110 through the reserved hand hole 111, and then pass out from the annular guide tube 121 at the lower end of the opening 110. Hydraulic oil is filled in the plastic corrugated tube 250 to avoid excessive friction between the prestressed anchor cable 20 and the pipe wall of the annular guide tube 121 during the tensioning process. A fixed end anchor 210 and a tensioning end anchor 220 are respectively installed at the ends of the upper and lower ends of the prestressed anchor cable 20. The fixed end anchor 210 is placed in the first anchor groove 112. The tensioning operation can be carried out through the reserved hand hole 111 of the ring segment of the opening 110. When the prestress reaches the design requirements and the lining structure reaches stability, the segments at the opening 110 can be removed ring by ring.

[0042] As a preferred embodiment, the segment body 10 includes a plurality of segment rings 120 sequentially spliced ​​along the extension direction of the main tunnel of the shield tunnel, and two adjacent segment rings 120 are connected by oblique bolts. As a specific example, the number of the segment rings 120 is three. The three segment rings 120 are arranged along the extension direction of the main tunnel of the shield tunnel. Compared with the staggered assembly form, the through-seam assembly facilitates the removal efficiency when the corresponding first special block 127 or the second special block 128 is removed when the complete segment structure is opened 110.

[0043] Furthermore, the upper wall surface of the opening 110 is recessed with a first anchor groove 112 for placing the fixed end anchor 210 towards the inside of the segment body 10, and the lower wall surface of the opening 110 is recessed with a second anchor groove 113 for placing the tension end anchor 220 towards the inside of the segment body 10. Specifically, the first anchor groove 112 and the second anchor groove 113 are provided to place the fixed end anchor 210 and the tension end anchor 220 corresponding to the prestressed anchor cable 20, so as to avoid conflicts between the subsequent support structure and the anchor position. The inner diameter of the first anchor groove 112 and the second anchor groove 113 needs to be greater than 200 mm, and the depth needs to be greater than 50 mm, so as to ensure that there is enough space to accommodate the anchor and facilitate the prestressing tensioning operation. The tensioning operation can be carried out by reserving a hand hole 111 at the opening 110. When the prestress reaches the design requirements and the lining structure reaches stability, the segment at the opening 110 can be removed ring by ring. After the tensioning is completed, waterproof concrete with a grade greater than C50 can be used to fill the first anchor groove 112 and the second anchor groove 113 to protect the anchors.

[0044] Furthermore, the first anchor groove 112 and the second anchor groove 113 are both cylindrical grooves, and the inner diameter of the cylindrical groove is greater than 200 mm and the depth is greater than 50 mm.

[0045] As a preferred embodiment, each of the segment rings 120 includes a capping block 122, a first adjacent block 123 and a second adjacent block 124 respectively spliced ​​on both sides of the capping block 122, a first standard block 125 and a second standard block 126 respectively located on both sides of the capping block 122, and a first special block 127 and a second special block 128 respectively located on both sides of the capping block 122, wherein the first standard block 125 is spliced ​​on the outside of the first adjacent block 123, and the second standard block 126 is spliced ​​on the outside of the second adjacent block 124. The first special block 127 is spliced ​​on the outside of the first standard block 125, and the second special block 128 is spliced ​​on the outside of the second standard block 126. The first special block 127, the first standard block 125, the first adjacent block 123, the capping block 122, the second adjacent block 124, the second standard block 126 and the second special block 128 together form an annular closed segment structure; wherein the opening 110 is arranged within the area corresponding to the first special block 127 and the second special block 128.

[0046] Further, the cross sections of the first special block 127, the first standard block 125, the first adjacent block 123, the capping block 122, the second adjacent block 124, the second standard block 126, and the second special block 128 are all fan-shaped. As a specific example, the arc center angle corresponding to the capping block 122 is 12.9°, the arc center angles corresponding to the first adjacent block 123, the second adjacent block 124, the first standard block 125, and the second standard block 126 are all 38.6°, and the arc center angles corresponding to the first special block 127 and the second special block 128 are 25.7°.

[0047] As a preferred embodiment, a first spiral rib 230 is pre-buried inside the segment body 10 on the side close to the fixed end anchor 210, and a second spiral rib 240 is pre-buried inside the segment body 10 on the side close to the tensioning end anchor 220, and both the first spiral rib 230 and the second spiral rib are sleeved on the outside of the prestressed anchor cable 20.

[0048] In this embodiment, the first spiral rib 230 and the second spiral rib 240 are provided. Figure 2-4 After the opening 110, a first spiral rib 230 is arranged inside the remaining first special block 127 and near the opening 110, and a second spiral rib 240 is arranged inside the second standard block 126 near the opening 110. Both the first spiral rib 230 and the second spiral rib 240 extend along the circumferential direction of the segment. The first spiral rib 230 and the second spiral rib 240 can increase the structural strength of the segment structure, improve its bearing capacity and bending resistance, thereby reinforcing the area near the opening 110, such as the first anchor groove 112 and the second anchor groove 113, to prevent the opening 110 from being damaged during the prestressing tensioning process.

[0049] Furthermore, the plurality of segment rings 120 are assembled in a through-seam manner along the extension direction of the shield tunnel main hole. Compared with the staggered assembly, the through-seam assembly facilitates the removal efficiency when the corresponding first special block 127 or second special block 128 is removed when the complete segment structure opening 110 is opened.

[0050] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An open ring segment structure for a vehicle-carrying transverse passage of a shield tunnel, characterized in that: It includes a segment body and a prestressed tensioning assembly; wherein, The segment body has an opening for vehicles to enter and exit the main hole of the shield tunnel; The prestressed tensioning assembly comprises a prestressed anchor cable, a fixed end anchor, and a tensioning end anchor; The segment body is provided with an annular guide tube for the prestressed anchor cable to pass through. The prestressed anchor cable includes an anchoring end and a tensioning end which are arranged opposite to each other along its own extension direction. The anchoring end is anchored to the upper wall surface of the opening through the fixed end anchor. The tensioning end is connected to the tensioning end anchor after passing through the annular guide tube. The tensioning end anchor is installed on the lower wall surface of the opening so as to perform tensioning operation on the prestressed anchor cable.

2. The shield tunnel vehicle transverse passage open ring segment structure according to claim 1 is characterized in that: The segment body comprises a plurality of segment rings which are sequentially spliced ​​along the extension direction of the main hole of the shield tunnel, and two adjacent segment rings are connected by oblique bolts.

3. The shield tunnel vehicle transverse passage open ring segment structure according to claim 2 is characterized in that: The upper wall surface of the opening is recessed toward the interior of the segment body to form a first anchor groove for placing the fixed end anchor, and the lower wall surface of the opening is recessed toward the interior of the segment body to form a second anchor groove for placing the tension end anchor.

4. The shield tunnel vehicle transverse passage open ring segment structure according to claim 3 is characterized in that: The first anchor groove and the second anchor groove are both cylindrical grooves, and the inner diameter of the cylindrical groove is greater than 200 mm and the depth is greater than 50 mm.

5. The shield tunnel vehicle transverse passage open ring segment structure according to claim 2 is characterized in that: Each of the segment rings includes a capping block, a first adjacent block and a second adjacent block respectively spliced ​​on both sides of the capping block, a first standard block and a second standard block respectively located on both sides of the capping block, and a first special block and a second special block respectively located on both sides of the capping block, the first standard block is spliced ​​on the outside of the first adjacent block, the second standard block is spliced ​​on the outside of the second adjacent block, the first special block is spliced ​​on the outside of the first standard block, the second special block is spliced ​​on the outside of the second standard block, the first special block, the first standard block, the first adjacent block, the capping block, the second adjacent block, the second standard block and the second special block together form an annular closed segment structure; wherein the opening is arranged within the region corresponding to the first special block and the second special block.

6. The shield tunnel vehicle transverse passage open ring segment structure according to claim 5, characterized in that: The cross sections of the first special block, the first standard block, the first adjacent block, the capping block, the second adjacent block, the second standard block and the second special block are all fan-shaped.

7. The shield tunnel vehicle transverse passage open ring segment structure according to claim 6 is characterized in that: The arc center angle corresponding to the capping block is 12.9°, the arc center angles corresponding to the first adjacent block, the second adjacent block, the first standard block and the second standard block are all 38.6°, and the arc center angles corresponding to the first special block and the second special block are 25.7°.

8. The shield tunnel vehicle transverse passage open ring segment structure according to claim 3, characterized in that: A first spiral rib is pre-buried inside the segment body near the fixed end anchor, and a second spiral rib is pre-buried inside the segment body near the tensioning end anchor. Both the first spiral rib and the second spiral rib are sleeved on the outside of the prestressed anchor cable.

9. The shield tunnel vehicle transverse passage open ring segment structure according to claim 2, characterized in that: A plurality of segment rings are assembled through seams along the extension direction of the main hole of the shield tunnel.

10. The shield tunnel vehicle transverse passage open ring segment structure according to claim 9, characterized in that: The number of the segment rings is three.

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