Reinforcement cage for tunnel molded lining

Abstract

The invention provides a reinforcement cage for tunnel molded lining, and relates to the technical field of tunnel lining.The reinforcement cage comprises an annular reinforcement segment, the annular reinforcement segment comprises multiple sets of arc-shaped reinforcements, and each set of arc-shaped reinforcements comprises first arc-shaped reinforcements and second arc-shaped reinforcements which are arranged at intervals; the first arc-shaped steel bars and the second arc-shaped steel bars are alternately arranged in the longitudinal depth direction of the tunnel. The end part of the first arc-shaped steel bar is provided with a first hook, and the end part of the second arc-shaped steel bar is provided with a second hook; at the end positions of the adjacent circumferential steel bar sections, the corresponding first hooks and the corresponding second hooks are in lap joint in the longitudinal depth direction of the tunnel, and the corresponding first hooks and the corresponding second hooks are in lap joint with each other. By means of the arrangement, the adjacent circumferential steel bar sections can be limited to move in the longitudinal depth direction of the tunnel and can also be limited to rotate relatively, the integrality of the adjacent circumferential steel bar sections is higher after the adjacent circumferential steel bar sections are connected, and the risk that cracks occur after concrete forming is reduced.

Description

Technical Field

[0001] This application relates to the technical field of tunnel lining, and particularly relates to a steel reinforcement cage for tunnel cast-in-place lining. Background Art

[0002] At present, during the construction of tunnel cast-in-place lining, the installation of steel bars generally adopts the manual binding operation method, which has problems such as a large number of operators, high labor intensity, great difficulty in construction management, and difficulty in the installation positioning and construction quality control of steel bars. With the gradual popularization of the concept of less manpower, mechanization, and unmanned operation in tunnel construction, the lining steel bar binding operation that requires a large amount of manual work no longer meets the requirements of the times.

[0003] In order to improve the operation efficiency, the steel reinforcement cage for tunnel lining can be prefabricated in sections in the factory and then transported into the tunnel for installation. Among them, the circumferential steel bars of the tunnel lining are important load-bearing members in the tunnel lining structure, mainly resisting the circumferential pressure on the tunnel lining, working together with the concrete, bearing tensile stress, improving the bearing capacity of the lining structure, and preventing the lining from being damaged due to the pressure of the rock and soil mass.

[0004] However, in the prior art, the connection reliability between adjacent circumferential steel bar segments is relatively low. During the concrete pouring process, the connection part is prone to looseness or displacement, which will cause disturbance to the concrete and result in a relatively high risk of cracks. Summary of the Invention

[0005] This application provides a steel reinforcement cage for tunnel cast-in-place lining. Between adjacent circumferential steel bar segments, it can not only restrict the movement along the depth direction of the tunnel but also restrict the relative rotation. The integrity of the adjacent circumferential steel bar segments after connection is higher. During the concrete pouring process, it can prevent the connection part of adjacent circumferential steel bar segments from loosening or displacing, and reduce the risk of cracks appearing after the concrete is formed.

[0006] To achieve the above object, this application adopts the following technical solutions: This application provides a steel reinforcement cage for tunnel cast-in-place lining, including: A plurality of circumferential steel bar segments arranged along the tunnel circumference. Each circumferential steel bar segment includes multiple groups of arc-shaped steel bars arranged along the depth direction of the tunnel. Each group of arc-shaped steel bars includes a first arc-shaped steel bar and a second arc-shaped steel bar arranged at intervals. The first arc-shaped steel bar is located on the side close to the tunnel inner wall, and the second arc-shaped steel bar is located on the side far from the tunnel inner wall. The first arc-shaped steel bar and the second arc-shaped steel bar are alternately arranged along the depth direction of the tunnel; The end of the first arc-shaped steel bar has a first hook, and the end of the second arc-shaped steel bar has a second hook. In each group of arc-shaped steel bars, the first hook and the second hook are arranged crosswise along the tunnel radial direction; At the end positions of adjacent circumferential steel bar segments, the corresponding first hooks and the corresponding second hooks overlap along the longitudinal direction of the tunnel respectively to restrict the movement of adjacent circumferential steel bar segments along the longitudinal direction of the tunnel, and the corresponding first hooks and second hooks overlap with each other to restrict the relative rotation of adjacent circumferential steel bar segments.

[0007] In a possible implementation, the first hook and the second hook respectively have inclined segments, and at the connection of adjacent circumferential steel bar segments, the inclined segments of the first hook of one of the adjacent circumferential steel bar segments and the inclined segments of the second hook of the other overlap with each other.

[0008] In a possible implementation, in each group of arc-shaped steel bars, the first hook of the first arc-shaped steel bar is welded to the second arc-shaped steel bar, and the second hook of the second arc-shaped steel bar is welded to the first arc-shaped steel bar.

[0009] In a possible implementation, welding steel bar segments are respectively arranged at the ends of the first hook and the second hook, the welding steel bar segments are arc-shaped, and the radian of the welding steel bar segments is the same as the radian of the first arc-shaped steel bar and the second arc-shaped steel bar; In each group of arc-shaped steel bars, the first hook of the first arc-shaped steel bar is welded to the second arc-shaped steel bar through the welding steel bar segment at its end, and the second hook of the second arc-shaped steel bar is welded to the first arc-shaped steel bar through the welding steel bar segment at its end.

[0010] In a possible implementation, insertion holes are respectively formed at the overlapping positions of the corresponding first hooks and the overlapping positions of the corresponding second hooks, and the steel cage further includes a first connecting pin, and the first connecting pin is in plug-in fit with the insertion holes. Under the action of the gravity of the circumferential steel bar segments, adjacent circumferential steel bar segments are in a tension locking state at the position of the first connecting pin.

[0011] In a possible implementation, the steel cage further includes longitudinal beam steel bar segments, the longitudinal beam steel bar segments are placed on the tunnel floor along the longitudinal direction of the tunnel, and a plurality of circumferential steel bar segments arranged along the circumferential direction of the tunnel form a circumferential steel bar assembly, and longitudinal beam steel bar segments are respectively arranged at both ends of the circumferential steel bar assembly; The longitudinal beam steel bar segments are provided with a plurality of limiting members, and the first hooks and the second hooks of each group of arc-shaped steel bars in the circumferential steel bar segments at the ends of the circumferential steel bar assembly are in limiting cooperation with the corresponding limiting members to restrict the swinging of the circumferential steel bar segments relative to the longitudinal beam steel bar segments.

[0012] In a possible implementation, the limiting members are located inside the longitudinal beam steel bar segments, and the first hooks and the second hooks of each group of arc-shaped steel bars in the circumferential steel bar segments at the ends of the circumferential steel bar assembly extend into the longitudinal beam steel bar segments to be in limiting cooperation with the corresponding limiting members.

[0013] In a possible implementation, the longitudinal beam steel bar segment includes multiple groups of longitudinal beam steel bars arranged in the width direction, and a mating portion is provided at the end of each group of longitudinal beam steel bars; Along the longitudinal direction of the tunnel, the ends of adjacent longitudinal beam steel bar segments are connected to each other. The mating portions of adjacent longitudinal beam steel bar segments are alternately overlapped in the width direction, and connection holes are formed at the alternating positions. A second connecting pin is inserted into the connection holes. Under the tension of adjacent longitudinal beam steel bar segments, the adjacent longitudinal beam steel bar segments are in a tension-locking state at the position of the second connecting pin.

[0014] In a possible implementation, the circumferential steel bar segment further includes multiple groups of longitudinal steel bars arranged along the circumferential direction of the tunnel. Each group of longitudinal steel bars includes a first longitudinal steel bar and a second longitudinal steel bar. The first longitudinal steel bar intersects and is welded with multiple first arc-shaped steel bars, and the second longitudinal steel bar intersects and is welded with multiple second arc-shaped steel bars.

[0015] In a possible implementation, in each group of longitudinal steel bars, the end of the first longitudinal steel bar extends to the outside of the first arc-shaped steel bar located at the edge, and the end of the second longitudinal steel bar extends to the outside of the second arc-shaped steel bar located at the edge; The steel cage further includes a support frame arranged along the circumferential direction of the tunnel. Multiple circumferential steel bar segments arranged along the circumferential direction of the tunnel are respectively clamped and matched with the support frame through their respective multiple groups of longitudinal steel bars. The support frame is placed in the clamping gap between the ends of the first longitudinal steel bars and the ends of the second longitudinal steel bars of each group of longitudinal steel bars.

[0016] It can be seen from the above technical solutions that the present application has at least the following beneficial effects: The present application provides a steel cage for tunnel cast-in-place lining, which includes multiple circumferential steel bar segments. The circumferential steel bar segments are prefabricated in a factory. Compared with the manual sequential binding of each steel bar, the processing accuracy of the prefabricated circumferential steel bar segments in the factory is high. The prefabricated circumferential steel bar segments are transported into the tunnel for assembly, which improves the construction efficiency compared with the traditional method of sequentially binding single steel bars in the tunnel. Adjacent circumferential steel bar segments are overlapped along the longitudinal direction of the tunnel through corresponding first hooks and overlapped along the longitudinal direction of the tunnel through corresponding second hooks to limit the movement of adjacent circumferential steel bar segments along the longitudinal direction of the tunnel. The corresponding first hooks and second hooks are overlapped with each other to limit the relative rotation of adjacent circumferential steel bar segments, so that the adjacent circumferential steel bar segments are in a relatively fixed state after connection, and the integrity of the adjacent circumferential steel bar segments after connection is higher. During the concrete pouring process, it prevents the connection parts of adjacent circumferential steel bar segments from loosening or displacing, and reduces the risk of cracks appearing after the concrete is formed.

[0017] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in this application does not imply that all features and advantages can be achieved in any single embodiment. On the contrary, it can be understood that the description of features or beneficial effects means that specific technical features, technical solutions or beneficial effects are included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in this embodiment can be combined in any appropriate manner. Those skilled in the art will understand that an embodiment can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the steel reinforcement cage for tunnel cast-in-place lining provided by this application in a specific embodiment; Figure 2 Schematic diagram of the circumferential steel bar segment provided by this application in a specific embodiment; Figure 3 is Figure 1 Partial schematic diagram of two adjacent circumferential steel bar segments in Figure 4 is Figure 3 Schematic diagram of the end positions of two adjacent circumferential steel bar segments in Figure 5 is Figure 1 Schematic diagram of the longitudinal beam steel bar segment in Figure 6 is Figure 1 Partial schematic diagram of the cooperation between the circumferential steel bar segment and the longitudinal beam steel bar segment in Figure 7 is Figure 1 Schematic diagram of the end positions of two adjacent longitudinal beam steel bar segments in Figure 8 is Figure 1 Partial schematic diagram of the cooperation between the circumferential steel bar segment and the support frame in

[0019] Reference numerals: 100 - steel reinforcement cage; 10 - circumferential steel bar segment; 101 - first circumferential steel bar segment; 102 - second circumferential steel bar segment; 11 - first arc-shaped steel bar; 12 - second arc-shaped steel bar; 13 - first hook; 14 - second hook; 15 - inclined section; 16 - insertion hole; 17 - welded steel bar segment; 181 - first longitudinal steel bar; 182 - second longitudinal steel bar; 19 - tie bar; 20 - longitudinal beam steel bar segment; 21 - longitudinal beam steel bar; 211 - first longitudinal beam steel bar; 212 - second longitudinal beam steel bar; 213 - third longitudinal beam steel bar; 22 - mating part; 23 - vertical steel bar; 24 - stirrup; 25 - connection hole; 26 - waist bar; 30 - first connecting pin; 40 - limiting member; 41 - limiting part; 42 - mounting plate; 50 - support frame; 60 - second connecting pin; X - first direction. Detailed implementation manners

[0020] The terms "first", "second", "third", etc. in the description and drawings of this application are used to distinguish different objects, rather than to limit a specific order.

[0021] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0022] For the sake of clear and concise description of the following embodiments, a brief introduction to the related art is given first: Tunnel lining refers to a permanent support structure built to prevent deformation and collapse of the surrounding strata of the tunnel and ensure the use function of the tunnel. During construction, by overlapping the steel reinforcement cages, setting up the formwork, and pouring concrete into the steel reinforcement cages, the tunnel lining is formed after the concrete is molded.

[0023] Due to the limited space inside the tunnel, in order to improve the erection efficiency of the steel reinforcement cages, the steel reinforcement cages can be prefabricated in sections in the factory and transported into the tunnel for assembly, which improves the assembly efficiency of the steel reinforcement cages.

[0024] The circumferential steel bars in the steel reinforcement cage located in the circumferential direction of the tunnel are important load-bearing members in the tunnel lining structure. They mainly resist the circumferential pressure on the tunnel lining, work together with the concrete, bear the tensile stress, improve the bearing capacity of the lining structure, and prevent the lining from being damaged due to the pressure of the rock and soil mass. However, in the prior art, the connection reliability between adjacent circumferential steel bar segments is relatively low. During the concrete pouring process, the connection part is prone to looseness or displacement, which will cause disturbance to the concrete and result in a relatively high risk of cracks.

[0025] In view of this, an embodiment of the present application provides a steel reinforcement cage for tunnel cast-in-place lining. At the end positions of adjacent circumferential steel bar segments, the corresponding first hooks and the corresponding second hooks overlap along the longitudinal direction of the tunnel respectively to limit the movement of adjacent circumferential steel bar segments along the longitudinal direction of the tunnel. The corresponding first hooks and second hooks overlap with each other to limit the relative rotation of adjacent circumferential steel bar segments, so that the adjacent circumferential steel bar segments are in a relatively fixed state after connection, and the integrity of the adjacent circumferential steel bar segments after connection is higher. During the concrete pouring process, it prevents the connection parts of adjacent circumferential steel bar segments from loosening or displacing, and reduces the risk of cracks appearing after the concrete is formed.

[0026] The following is an introduction to the steel reinforcement cage 100 provided by the embodiment of the present application: As Figure 1-2 shown, this kind of steel reinforcement cage 100 includes a plurality of circumferential steel bar segments 10, and the plurality of circumferential steel bar segments 10 are arranged along the circumferential direction of the tunnel. The circumferential steel bar segment 10 includes multiple groups of arc-shaped steel bars arranged along the longitudinal direction of the tunnel. Each group of arc-shaped steel bars includes a first arc-shaped steel bar 11 and a second arc-shaped steel bar 12 arranged at intervals. The first arc-shaped steel bar 11 is located on the side close to the inner wall of the tunnel, and the second arc-shaped steel bar 12 is located on the side far from the inner wall of the tunnel. The first arc-shaped steel bar 11 and the second arc-shaped steel bar 12 are alternately arranged along the longitudinal direction of the tunnel.

[0027] Among them, the end of the first arc-shaped steel bar 11 has a first hook 13, and the end of the second arc-shaped steel bar 12 has a second hook 14. In each group of arc-shaped steel bars, the first hook 13 and the second hook 14 are arranged to cross each other along the radial direction of the tunnel.

[0028] Specifically, the first hook 13 can be formed by bending the end of the first arc-shaped steel bar 11, and the second hook 14 can be formed by bending the end of the second arc-shaped steel bar 12.

[0029] As Figure 3-4 shown, at the end positions of adjacent circumferential steel bar segments 10, the corresponding first hooks 13 and the corresponding second hooks 14 overlap along the longitudinal direction of the tunnel respectively to limit the movement of adjacent circumferential steel bar segments 10 along the longitudinal direction of the tunnel. The corresponding first hooks 13 and second hooks 14 overlap to limit the relative rotation of adjacent circumferential steel bar segments 10.

[0030] As Figure 3-4, showing two adjacent circumferential steel bar segments 10 out of multiple circumferential steel bar segments 10. The two adjacent circumferential steel bar segments 10 are the first circumferential steel bar segment 101 and the second circumferential steel bar segment 102 respectively. In each group of arc-shaped steel bars of the first circumferential steel bar segment 101, along the first direction X, the second arc-shaped steel bar 12 and the first arc-shaped steel bar 11 are alternately arranged in sequence. In each group of arc-shaped steel bars of the second circumferential steel bar segment 102, along the first direction X, the first arc-shaped steel bar 11 and the second arc-shaped steel bar 12 are alternately arranged in sequence. The first direction X is parallel to the tunnel depth direction.

[0031] The end of the first circumferential steel bar segment 101 is connected to the end of the second circumferential steel bar segment 102. At the end positions of the first circumferential steel bar segment 101 and the second circumferential steel bar segment 102, multiple groups of arc-shaped steel bars of the first circumferential steel bar segment 101 and multiple groups of arc-shaped steel bars of the second circumferential steel bar segment 102 correspond one by one. The first hook 13 of the first circumferential steel bar segment 101 and the first hook 13 of the second circumferential steel bar segment 102 overlap along the tunnel depth direction. The second hook 14 of the first circumferential steel bar segment 101 and the second hook 14 of the second circumferential steel bar segment 102 overlap along the tunnel depth direction, so that the first circumferential steel bar segment 101 and the second circumferential steel bar segment 102 restrict each other and prevent the first circumferential steel bar segment 101 and the second circumferential steel bar segment 102 from staggering along the tunnel depth direction.

[0032] The first hook 13 of the first circumferential steel bar segment 101 and the second hook 14 of the second circumferential steel bar segment 102 overlap in the circumferential direction. The second hook 14 of the first circumferential steel bar segment 101 and the first hook 13 of the second circumferential steel bar segment 102 overlap in the circumferential direction, so that the first circumferential steel bar segment 101 and the second circumferential steel bar segment 102 restrict each other and prevent the first circumferential steel bar segment 101 and the second circumferential steel bar segment 102 from rotating relative to each other.

[0033] In this embodiment, the steel reinforcement cage 100 includes a plurality of circumferential steel bar segments 10. The circumferential steel bar segments 10 are prefabricated in a factory. Compared with the method of manually tying each steel bar in sequence, the processing accuracy of the circumferential steel bar segments 10 prefabricated in the factory is high. After the prefabricated circumferential steel bar segments 10 are transported into the tunnel for assembly, the construction efficiency is improved compared with the traditional method of manually tying single steel bars in sequence in the tunnel. Adjacent circumferential steel bar segments 10 are overlapped along the longitudinal direction of the tunnel through the mutually corresponding first hooks 13 and the mutually corresponding second hooks 14 along the longitudinal direction of the tunnel to limit the movement of adjacent circumferential steel bar segments 10 along the longitudinal direction of the tunnel. The mutually corresponding first hooks 13 and second hooks 14 are overlapped with each other to limit the relative rotation of adjacent circumferential steel bar segments 10, so that adjacent circumferential steel bar segments 10 are in a relatively fixed state after connection. The integrity of adjacent circumferential steel bar segments 10 after connection is higher. During the concrete pouring process, it prevents the connection parts of adjacent circumferential steel bar segments 10 from loosening or displacing, and reduces the risk of cracks appearing after the concrete is formed.

[0034] Furthermore, adjacent circumferential steel bar segments 10 are overlapped along the longitudinal direction of the tunnel through the mutually corresponding first hooks 13 and the mutually corresponding second hooks 14 along the longitudinal direction of the tunnel, realizing the positioning of the circumferential steel bar segments 10 along the longitudinal direction of the tunnel. The first hook 13 of one of the adjacent circumferential steel bar segments 10 and the second hook 14 of the other are overlapped, realizing the positioning of the circumferential steel bar segments 10 along the circumferential direction of the tunnel, and improving the installation accuracy of the circumferential steel bar segments 10.

[0035] Specifically, the first hook 13 and the second hook 14 respectively have inclined segments 15. At the connection of adjacent circumferential steel bar segments 10, the inclined segment 15 of the first hook 13 of one of the adjacent circumferential steel bar segments 10 and the inclined segment 15 of the second hook 14 of the other are overlapped with each other.

[0036] As Figure 4 shown, the inclined segment 15 of the first hook 13 of the first circumferential steel bar segment 101 and the inclined segment 15 of the second hook 14 of the second circumferential steel bar segment 102 are overlapped with each other, and the inclined segment 15 of the second hook 14 of the first circumferential steel bar segment 101 and the inclined segment 15 of the first hook 13 of the second circumferential steel bar segment 102 are overlapped with each other.

[0037] In this embodiment, the mutually corresponding first hooks 13 and second hooks 14 between adjacent circumferential steel bar segments 10 are overlapped with each other through the inclined segments 15, which can better limit the relative rotation of adjacent circumferential steel bar segments 10.

[0038] In a specific embodiment, in each group of arc-shaped steel bars, the first hook 13 of the first arc-shaped steel bar 11 is welded to the second arc-shaped steel bar 12, and the second hook 14 of the second arc-shaped steel bar 12 is welded to the first arc-shaped steel bar 11, so that the ends of adjacent circumferential steel bar segments 10 are overlapped more reliably together. During the concrete pouring process, it further prevents the adjacent circumferential steel bar segments 10 from loosening or displacing.

[0039] Specifically, as Figure 4 shown, welding steel bar segments 17 are respectively arranged at the ends of the first hook 13 and the second hook 14. The welding steel bar segments 17 are arc-shaped, and the radian of the welding steel bar segments 17 is the same as that of the first arc-shaped steel bar 11 and the second arc-shaped steel bar 12; in each group of arc-shaped steel bars, the first hook 13 of the first arc-shaped steel bar 11 is welded to the second arc-shaped steel bar 12 through the welding steel bar segment 17 at its end, and the second hook 14 of the second arc-shaped steel bar 12 is welded to the first arc-shaped steel bar 11 through the welding steel bar segment 17 at its end.

[0040] In this embodiment, the radian of the welding steel bar segments 17 is the same as that of the arc-shaped steel bars. It is easier to control the welding angle and position during welding, and the operation can be more convenient, making the welding joints more uniform and flat, and reducing the generation of welding defects.

[0041] In a specific embodiment, insertion holes 16 are respectively formed at the overlapping parts of the mutually corresponding first hooks 13 and the overlapping parts of the mutually corresponding second hooks 14. The steel reinforcement cage 100 further includes a first connecting pin 30. The first connecting pin 30 is in plug-in fit with the insertion holes 16. Under the action of the gravity of the circumferential steel bar segments 10, the adjacent circumferential steel bar segments 10 are in a tension-locking state at the position of the first connecting pin 30.

[0042] As Figure 4 shown, an insertion hole 16 is formed at the overlapping part of the first hook 13 of the first circumferential steel bar segment 101 and the first hook 13 of the second circumferential steel bar segment 102, and another insertion hole 16 is formed at the overlapping part of the second hook 14 of the first circumferential steel bar segment 101 and the second hook 14 of the second circumferential steel bar segment 102; the first connecting pin 30 is in plug-in fit with the insertion holes 16.

[0043] In this embodiment, the first connecting pin 30 is in plug-in fit with the insertion holes 16, and the connection of adjacent circumferential steel bar segments 10 can be realized. The operation is convenient and the construction efficiency is improved.

[0044] The first connecting pin 30 can specifically be a steel bar or an insertion rod made of other metal materials.

[0045] To prevent the hooked bars from being pulled and broken under the tension, in each group of arc-shaped steel bars, the first hooked bar 13 of the first arc-shaped steel bar 11 is welded to the second arc-shaped steel bar 12, and the second hooked bar 14 of the second arc-shaped steel bar 12 is welded to the first arc-shaped steel bar 11.

[0046] In a specific embodiment, as Figure 1 , Figure 5 and Figure 6 shown, the steel reinforcement cage 100 further includes longitudinal beam steel bar segments 20, which are placed on the tunnel floor along the longitudinal direction of the tunnel, and a plurality of circumferential steel bar segments 10 arranged along the circumferential direction of the tunnel form a circumferential steel bar assembly, and longitudinal beam steel bar segments 20 are respectively arranged at both ends of the circumferential steel bar assembly; the longitudinal beam steel bar segments 20 are provided with a plurality of limiting members 40, and the first hooked bar 13 and the second hooked bar 14 of each group of arc-shaped steel bars in the circumferential steel bar segments 10 at the ends of the circumferential steel bar assembly are in limiting cooperation with the corresponding limiting members 40 to limit the circumferential steel bar segments 10 from swinging relative to the longitudinal beam steel bar segments 20.

[0047] Wherein, the first hooked bar 13 and the second hooked bar 14 of each group of arc-shaped steel bars can be in limiting cooperation with two different limiting members 40 respectively; or, the first hooked bar 13 and the second hooked bar 14 of each group of arc-shaped steel bars can be in limiting cooperation with the same limiting member 40.

[0048] In this embodiment, the longitudinal beam steel bar segments 20 are prefabricated in the factory, and the prefabricated longitudinal beam steel bar segments 20 are transported into the tunnel for assembly, which improves the construction efficiency compared with the traditional method of successively binding single steel bars manually in the tunnel; through the arrangement of the limiting members 40 of the longitudinal beam steel bar segments 20, the accurate positioning and fixation of the circumferential steel bar segments 10 can be ensured, which is beneficial to ensuring the assembly accuracy of the steel reinforcement cage 100.

[0049] Specifically, as Figure 6 shown, the limiting members 40 are located inside the longitudinal beam steel bar segments 20, and the first hooked bar 13 and the second hooked bar 14 of each group of arc-shaped steel bars in the circumferential steel bar segments 10 at the ends of the circumferential steel bar assembly extend into the longitudinal beam steel bar segments 20 and are in limiting cooperation with the corresponding limiting members 40.

[0050] In this embodiment, the circumferential steel bar segments 10 extend into the longitudinal beam steel bar segments 20. After the cast concrete is formed, the circumferential steel bar segments 10 and the longitudinal beam steel bar segments 20 form an integral body. The circumferential steel bar segments 10 ensure the strength and stability of the tunnel in the cross-section, and the longitudinal beam steel bar segments 20 strengthen the continuity and integrity of the tunnel in the longitudinal direction. This integral structure can better resist the action of various complex external forces and improve the seismic performance, impact resistance and the ability to resist stratum movement of the tunnel structure.

[0051] Specifically, the limiting member 40 includes two limiting portions 41 arranged along the depth direction of the tunnel. There is a limiting gap between the two limiting portions 41. The first hook 13 and the second hook 14 of each group of arc-shaped steel bars in the circumferential steel bar segment 10 at the end of the circumferential steel bar assembly are inserted into the limiting gap.

[0052] In a specific embodiment, as Figure 5 and Figure 7 shown, the longitudinal beam steel bar segment 20 includes multiple groups of longitudinal beam steel bars 21 arranged along the width direction. A mating portion 22 is provided at the end of each group of longitudinal beam steel bars 21; along the depth direction of the tunnel, the ends of adjacent longitudinal beam steel bar segments 20 are connected to each other. The mating portions 22 of adjacent longitudinal beam steel bar segments 20 are alternately overlapped along the width direction, and a connection hole 25 is formed at the alternating position. A second connecting pin 60 is inserted into the connection hole 25. Under the tension of adjacent longitudinal beam steel bar segments 20, adjacent longitudinal beam steel bar segments 20 are in a tension-locking state at the position of the second connecting pin 60.

[0053] According to the length of the tunnel, two, three or more adjacent longitudinal beam steel bar segments 20 can be laid.

[0054] In this embodiment, adjacent longitudinal beam steel bar segments 20 are connected by a pin-hole connection method, which is convenient and fast, improves construction efficiency, and the ends of adjacent longitudinal beam steel bar segments 20 are connected to each other, preventing the occurrence of construction joints between the two and ensuring integrity.

[0055] Specifically, as Figure 7 shown, each group of longitudinal beam steel bars 21 includes a first longitudinal beam steel bar 211, a second longitudinal beam steel bar 212, and a third longitudinal beam steel bar 213. The longitudinal beam steel bar segment 20 further includes a vertical steel bar 23. The first longitudinal beam steel bar 211 and the second longitudinal beam steel bar 212 are arranged at intervals on the top of the vertical steel bar 23, and the third longitudinal beam steel bar 213 is arranged at the bottom of the vertical steel bar 23. The ends of the first longitudinal beam steel bar 211, the second longitudinal beam steel bar 212, and the third longitudinal beam steel bar 213 are all connected to the vertical steel bar 23 to form the mating portion 22.

[0056] Two adjacent longitudinal beam steel bar segments 20 are respectively a first longitudinal beam steel bar segment and a second longitudinal beam steel bar segment. Each group of longitudinal beam steel bars 21 of the first longitudinal beam steel bar segment and each group of longitudinal beam steel bars 21 of the second longitudinal beam steel bar segment are alternately overlapped along the width direction. At the overlapping position, the first longitudinal beam steel bar 211, the second longitudinal beam steel bar 212, and the third longitudinal beam steel bar 213 of the first longitudinal beam steel bar segment are respectively overlapped with the first longitudinal beam steel bar 211, the second longitudinal beam steel bar 212, and the third longitudinal beam steel bar 213 of the second longitudinal beam steel bar segment along the width direction. At the top position and the bottom position, a first connection hole and a second connection hole are respectively formed, and a second connecting pin 60 is respectively inserted into the first connection hole and the second connection hole.

[0057] In other embodiments, the mating portion 22 may be a hook provided at the end of the longitudinal beam steel bar 21, which is similar to the way the hook provided at the end of the arc-shaped steel bar is connected to the first connecting pin 30.

[0058] Specifically, the longitudinal beam steel bar segment 20 further includes a plurality of stirrups 24 and a plurality of waist bars 26. The stirrups 24 surround the outer periphery of multiple groups of longitudinal beam steel bars 21 and are welded to the multiple groups of longitudinal beam steel bars 21; the plurality of waist bars 26 are arranged crosswise in the stirrups 24 and are welded to the stirrups 24.

[0059] The limiting member 40 further includes a mounting plate 42. The mounting plate 42 is welded to the waist bar 26, and the limiting portion 41 is welded to the mounting plate 42.

[0060] In a specific embodiment, as Figure 2 、 Figure 3 shown, the circumferential steel bar segment 10 further includes multiple groups of longitudinal steel bars arranged along the tunnel circumference. Each group of longitudinal steel bars includes a first longitudinal steel bar 181 and a second longitudinal steel bar 182. The first longitudinal steel bar 181 intersects and is welded with multiple first arc-shaped steel bars 11, and the second longitudinal steel bar 182 intersects and is welded with multiple second arc-shaped steel bars 12.

[0061] In this embodiment, the arc-shaped steel bars and the longitudinal steel bars form a stable spatial network structure. This structure can better withstand loads from different directions, improve the integrity and stability of the structure, effectively resist external forces such as the pressure of the soil around the tunnel, and reduce the possibility of structural deformation and damage.

[0062] Specifically, the circumferential steel bar segment 10 further includes a plurality of tie bars 19. The tie bars 19 are arranged at the intersection positions of the first arc-shaped steel bar 11 and the first longitudinal steel bar 181 and at the intersection positions of the second arc-shaped steel bar 12 and the second longitudinal steel bar 182. The first arc-shaped steel bar 11 and the second arc-shaped steel bar 12 are respectively welded to the tie bars 19.

[0063] To improve the cooperative working ability of the circumferential steel bar segment 10 when stressed, as Figure 2-3 shown, in each group of longitudinal steel bars, the end of the first longitudinal steel bar 181 extends to the outside of the first arc-shaped steel bar 11 located at the edge, and the end of the second longitudinal steel bar 182 extends to the outside of the second arc-shaped steel bar 12 located at the edge; as Figure 8 shown, the steel cage 100 further includes a support frame 50. The support frame 50 is arranged along the tunnel circumference. Multiple circumferential steel bar segments 10 arranged along the tunnel circumference are respectively clamped and matched with the support frame 50 through their respective multiple groups of longitudinal steel bars. The support frame 50 is placed in the clamping gap between the end of the first longitudinal steel bar 181 and the end of the second longitudinal steel bar 182 of each group of longitudinal steel bars.

[0064] In this embodiment, the circumferential steel bar segment 10 can be relatively fixed to the support frame 50, so that the circumferential steel bar segments 10 form a continuous integral structure, jointly bear external loads, improve the cooperative working ability of the steel reinforcement cage 100 when stressed, reduce local deformation and stress concentration phenomena, and enhance the overall stability; the support frame 50 can also play a positioning role to ensure that the circumferential steel bar segments 10 maintain the designed position and spacing during installation and concrete pouring, avoid steel bar displacement, ensure that the geometric dimensions and shape of the steel reinforcement cage 100 meet the design requirements, and thus effectively exert the bearing capacity of the steel reinforcement cage 100.

[0065] Among them, the support frame 50 can be a grid steel frame or a support frame made of other metal materials.

[0066] As Figure 8 shown, along the longitudinal direction of the tunnel, the longitudinal steel bars of two adjacent circumferential steel bar segments 10 are respectively inserted into the support frame 50.

[0067] The assembly process of the steel reinforcement cage 100 is introduced as follows: Precast the circumferential steel bar segments 10 and the longitudinal beam steel bar segments 20 in the factory; transport the circumferential steel bar segments 10, the longitudinal beam steel bar segments 20, the support frame 50, the first connecting pin 30 and the second connecting pin 60 into the tunnel; place the longitudinal beam steel bar segments 20 on the ground corresponding to the side walls on both sides of the tunnel respectively, and insert the second connecting pin 60 into the connecting holes 25 between adjacent longitudinal beam steel bar segments 20 to connect the adjacent longitudinal beam steel bar segments 20; lift the support frame 50 into the tunnel, and limit and cooperate the two ends of the support frame 50 with the respective limit members 40 in the longitudinal beam steel bar segments 20 on both sides; lift multiple circumferential steel bar segments 10 to the circumferential position of the tunnel, extend the ends of the circumferential steel bar segments 10 located on the side walls on both sides of the tunnel into the corresponding longitudinal beam steel bar segments 20, and limit and cooperate with the limit members 40; insert the first connecting pin 30 into the insertion holes 16 between adjacent circumferential steel bar segments 10 to connect multiple circumferential steel bar segments 10 to form a circumferential steel bar assembly; insert and cooperate the longitudinal steel bars of the circumferential steel bar assembly with the support frame 50.

[0068] The assembly process of other circumferential steel bar assemblies arranged along the longitudinal direction of the tunnel refers to the above assembly process.

[0069] The above is only the specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A steel cage for tunnel mold lining, characterized in that: include: A plurality of annular steel bar segments, wherein the plurality of annular steel bar segments are arranged in annular direction along the tunnel, wherein the annular steel bar segments include a plurality of groups of arcuate steel bars arranged in a longitudinal direction of the tunnel, wherein each group of arcuate steel bars includes a first arcuate steel bar and a second arcuate steel bar arranged at intervals, wherein the first arcuate steel bar is located on a side close to an inner wall of the tunnel, and the second arcuate steel bar is located on a side away from an inner wall of the tunnel, and the first arcuate steel bar and the second arcuate steel bar are alternately arranged in the longitudinal direction of the tunnel; The end of the first arc-shaped steel bar has a first hook, and the end of the second arc-shaped steel bar has a second hook. In each group of arc-shaped steel bars, the first hook and the second hook are cross-arranged along the radial direction of the tunnel; At the end positions of adjacent annular steel bar segments, the corresponding first hooks and the corresponding second hooks are overlapped respectively along the longitudinal direction of the tunnel to limit the movement of the adjacent annular steel bar segments along the longitudinal direction of the tunnel, and the corresponding first hooks and the second hooks are overlapped with each other to limit the relative rotation of the adjacent annular steel bar segments.

2. The steel cage according to claim 1, characterized in that: The first hook and the second hook each have an inclined section, and at the connection between adjacent annular steel bar segments, the inclined section of the first hook of one of the adjacent annular steel bar segments and the inclined section of the second hook of the other adjacent annular steel bar segments overlap each other.

3. The steel cage according to claim 1, characterized in that: In each group of arc-shaped steel bars, the first hook of the first arc-shaped steel bar is welded to the second arc-shaped steel bar, and the second hook of the second arc-shaped steel bar is welded to the first arc-shaped steel bar.

4. The steel cage according to claim 3, characterized in that: The ends of the first hook and the second hook are respectively provided with welded steel bar segments, the welded steel bar segments are arc-shaped, and the arc of the welded steel bar segments is the same as the arc of the first arc-shaped steel bar and the second arc-shaped steel bar; In each group of arc-shaped steel bars, the first hook of the first arc-shaped steel bar is welded to the second arc-shaped steel bar through the welded steel bar segment at its end, and the second hook of the second arc-shaped steel bar is welded to the first arc-shaped steel bar through the welded steel bar segment at its end.

5. The steel cage according to claim 1, characterized in that: The overlapping parts of the corresponding first hooks and the overlapping parts of the corresponding second hooks respectively form plug-in holes, and the steel cage also includes a first connecting pin, which is plugged into the plug-in hole. Under the action of the gravity of the annular steel bar segments, the adjacent annular steel bar segments are in a tensile and locked state at the position of the first connecting pin.

6. The steel cage according to claim 1, characterized in that: The steel cage further comprises a longitudinal beam steel segment, wherein the longitudinal beam steel segment is placed on the tunnel ground along the longitudinal direction of the tunnel, and a plurality of the annular steel segments arranged along the tunnel annularly form an annular steel assembly, and the longitudinal beam steel segments are respectively arranged at both ends of the annular steel assembly; The longitudinal beam steel bar segment is provided with a plurality of limit members, and the first hook and the second hook of each group of arc-shaped steel bars in the annular steel bar segment located at the end of the annular steel bar assembly are limitedly cooperated with the corresponding limit members to limit the swing of the annular steel bar segment relative to the longitudinal beam steel bar segment.

7. The steel cage according to claim 6, characterized in that: The limiting piece is located inside the longitudinal beam steel bar segment, and the first hook and the second hook of each group of arc-shaped steel bars in the annular steel bar segment located at the end of the annular steel bar assembly extend into the longitudinal beam steel bar segment and cooperate with the corresponding limiting piece.

8. The steel cage according to claim 6, characterized in that: The longitudinal beam steel bar segment comprises a plurality of groups of longitudinal beam steel bars arranged along the width direction, and a matching portion is provided at the end of each group of longitudinal beam steel bars; Along the longitudinal direction of the tunnel, the ends of adjacent longitudinal beam steel bar segments are connected to each other, and the matching parts of adjacent longitudinal beam steel bar segments are alternately overlapped along the width direction, and connecting holes are formed at alternate positions, and second connecting pins are inserted in the connecting holes. Under the tensile action of adjacent longitudinal beam steel bar segments, the adjacent longitudinal beam steel bar segments are in a tensile locking state at the position of the second connecting pin.

9. The steel cage according to claim 1, characterized in that: The circumferential steel bar segment also includes multiple groups of longitudinal steel bars arranged along the tunnel circumference, each group of longitudinal steel bars includes a first longitudinal steel bar and a second longitudinal steel bar, the first longitudinal steel bar crosses and is welded with multiple first arc-shaped steel bars, and the second longitudinal steel bar crosses and is welded with multiple second arc-shaped steel bars.

10. The steel cage according to claim 9, characterized in that: In each group of longitudinal steel bars, the end of the first longitudinal steel bar extends to the outside of the first arc-shaped steel bar located at the edge, and the end of the second longitudinal steel bar extends to the outside of the second arc-shaped steel bar located at the edge; The steel cage also includes a support frame, which is arranged along the circumferential direction of the tunnel. The multiple circumferential steel bar segments arranged along the circumferential direction of the tunnel are respectively engaged with the support frame through their respective multiple groups of longitudinal steel bars. The support frame is placed in the engaging gap between the end of the first longitudinal steel bar and the end of the second longitudinal steel bar of each of the multiple groups of longitudinal steel bars.

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