A steel cage for tunnel formwork lining

Abstract

The present application provides a steel cage for tunnel cast lining, which relates to the technical field of tunnel lining. The steel cage includes a circumferential steel bar segment, and the circumferential steel bar segment includes multiple groups of arc-shaped steel bars. 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 and the second arc-shaped steel bar are alternately arranged along the longitudinal 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. At the end positions of adjacent circumferential steel bar segments, the first hooks and the second hooks corresponding to each other are overlapped along the longitudinal depth direction of the tunnel, and the first hooks and the second hooks corresponding to each other are overlapped. With such an arrangement, the adjacent circumferential steel bar segments can be restricted from moving along the longitudinal depth direction of the tunnel and from rotating relative to each other. The integrity of the adjacent circumferential steel bar segments after connection is higher, which reduces the risk of cracks after concrete forming.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel lining, and in particular to a steel cage for tunnel mold lining. Background Art

[0002] At present, manual binding is commonly used for steel bar installation during tunnel formwork lining construction. This has problems such as a large number of operators, high labor intensity, difficult construction management, and difficulty in steel bar installation positioning and construction quality control. As the concept of less-manned, mechanized, and unmanned tunnel construction becomes increasingly popular, the lining steel bar binding operation that requires a large amount of manual labor no longer meets the requirements of the development of the times.

[0003] To improve operational efficiency, tunnel lining reinforcement cages can be prefabricated in sections in a factory and then transported to the tunnel for installation. Tunnel lining hoop reinforcement is a critical load-bearing component in the tunnel lining structure, primarily resisting the hoop pressure exerted on the tunnel lining. Working in conjunction with the concrete, it withstands tensile stress, improves the lining's load-bearing capacity, and prevents lining damage caused by rock and soil pressure.

[0004] However, in the prior art, the connection reliability between adjacent circumferential steel bar segments is low. During the concrete pouring process, the connection parts are prone to loosening or displacement, which will cause disturbance to the concrete and lead to a higher risk of cracks. Summary of the Invention

[0005] The present application provides a steel cage for tunnel formwork lining, in which adjacent annular steel segments can limit both movement along the tunnel depth direction and relative rotation. The adjacent annular steel segments have higher integrity after being connected. During the concrete pouring process, the connection parts of the adjacent annular steel segments are prevented from loosening or displacement, reducing the risk of cracks after concrete molding.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] The present application provides a reinforcement cage for tunnel formwork lining, comprising:

[0008] a plurality of circumferential steel bar segments, the plurality of circumferential steel bar segments being arranged circumferentially along the tunnel, the circumferential steel bar segments comprising a plurality of groups of arcuate steel bars arranged in a longitudinal direction of the tunnel, each group of arcuate steel bars comprising a first arcuate steel bar and a second arcuate steel bar arranged at intervals, the first arcuate steel bar being located on a side close to an inner wall of the tunnel, the second arcuate steel bar being located on a side away from the inner wall of the tunnel, and the first arcuate steel bar and the second arcuate steel bar being alternately arranged in the longitudinal direction of the tunnel;

[0009] 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;

[0010] At the end positions of adjacent circumferential 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 circumferential steel bar segments along the depth 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 circumferential steel bar segments.

[0011] In one possible implementation, the first hook and the second hook respectively have an inclined section, and at the connection of 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.

[0012] 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.

[0013] In a possible implementation, a welded steel bar segment is provided at the end of the first hook and the end of the second hook respectively. The welded steel bar segment is arc-shaped, and the curvature of the welded steel bar segment is the same as that of the first arc-shaped steel bar and the second arc-shaped steel bar.

[0014] In each set 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.

[0015] In one possible implementation, 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.

[0016] In one possible implementation, the steel cage further includes longitudinal beam steel segments, which are placed on the tunnel floor along the longitudinal depth direction of the tunnel. A plurality of circumferential steel segments arranged along the tunnel circumference form a circumferential steel assembly, and longitudinal beam steel segments are respectively provided at both ends of the circumferential steel assembly.

[0017] The longitudinal beam steel bar segment is provided with multiple limiters. The first hook and the second hook of each group of arc steel bars in the circumferential steel bar segment located at the end of the circumferential steel bar assembly are limitedly matched with the corresponding limiters to limit the swing of the circumferential steel bar segment relative to the longitudinal beam steel bar segment.

[0018] In one possible implementation, 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 steel bars in the circumferential steel bar segment at the end of the circumferential steel bar assembly extend into the longitudinal beam steel bar segment and cooperate with the corresponding limiting piece.

[0019] In a possible implementation, the longitudinal beam steel bar segment includes a plurality of groups of longitudinal beam steel bars arranged along the width direction, and the end of each group of longitudinal beam steel bars is provided with a matching portion;

[0020] 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 the adjacent longitudinal beam steel bar segments are alternately overlapped along the width direction, and connecting holes are formed at alternating positions. A second connecting pin is inserted into the connecting hole. Under the tensile action of the 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.

[0021] In one possible implementation, the circumferential reinforcement segment also includes multiple groups of longitudinal reinforcements arranged along the circumference of the tunnel, each group of longitudinal reinforcements includes a first longitudinal reinforcement and a second longitudinal reinforcement, the first longitudinal reinforcement crosses and is welded with multiple first arc-shaped reinforcements, and the second longitudinal reinforcement crosses and is welded with multiple second arc-shaped reinforcements.

[0022] 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;

[0023] The steel cage also includes a support frame, which is arranged along the circumference of the tunnel. Multiple circumferential steel bar segments arranged along the circumference 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.

[0024] It can be seen from the above technical solution that this application has at least the following beneficial effects:

[0025] The present application provides a steel cage for tunnel formwork lining, comprising a plurality of circumferential steel bar segments, which are prefabricated in a factory. Compared with manual binding of steel bars one by one, the processing precision of the circumferential steel bar segments prefabricated in the factory is high. The prefabricated circumferential steel bar segments are transported to the tunnel for assembly, which improves the construction efficiency compared with the traditional manual binding and forming of single steel bars in the tunnel. Adjacent circumferential steel bar segments are overlapped along the longitudinal direction of the tunnel by corresponding first hooks and corresponding second hooks, so as 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 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 being connected. The integrity of the adjacent circumferential steel bar segments after being connected is higher. During the concrete pouring process, the connection parts of the adjacent circumferential steel bar segments are prevented from loosening or displacement, thereby reducing the risk of cracks after concrete forming.

[0026] 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 realized in any single embodiment. On the contrary, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution or beneficial effect is included in at least one embodiment. Therefore, the description of a technical feature, technical solution or beneficial effect in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can also be combined in any appropriate manner. Those skilled in the art will understand that the 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

[0027] Figure 1 A schematic diagram of a steel cage for tunnel mold lining provided in this application in a specific embodiment;

[0028] Figure 2 A schematic diagram of a circumferential steel bar segment provided in this application in a specific embodiment;

[0029] Figure 3 for Figure 1 Partial schematic diagram of two adjacent circumferential reinforcement segments;

[0030] Figure 4 for Figure 3 Schematic diagram of the end positions of two adjacent circumferential reinforcement segments;

[0031] Figure 5 for Figure 1 Schematic diagram of the center longitudinal beam reinforcement segment;

[0032] Figure 6 for Figure 1 Partial schematic diagram of the coordination between the central ring reinforcement segment and the longitudinal beam reinforcement segment;

[0033] Figure 7 for Figure 1 Schematic diagram of the end positions of two adjacent longitudinal beam reinforcement segments;

[0034] Figure 8 for Figure 1 Partial schematic diagram of the coordination between the central annular reinforcement segment and the support frame.

[0035] : Figure 1: 100-rebar 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-plug-in hole; 17-welded steel bar segment; 181-first longitudinal steel bar; 182-second longitudinal steel bar; 19-tension 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-matching part; 23-vertical steel bar; 24-stirrup; 25-connecting hole; 26-waist bar; 30-first connecting pin; 40-limiting piece; 41-limiting part; 42-mounting plate; 50-support frame; 60-second connecting pin; X-first direction. DETAILED DESCRIPTION

[0036] The terms "first", "second" and "third" in this application specification and the accompanying drawings are used to distinguish different objects rather than to limit a specific order.

[0037] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0038] To make the description of the following embodiments clear and concise, a brief introduction to the related technologies is first given:

[0039] Tunnel lining refers to a permanent support structure built to prevent deformation and collapse of the ground surrounding the tunnel and ensure its continued use. During construction, concrete is poured into the cages by assembling steel bars, setting up formwork, and then forming the tunnel lining.

[0040] Due to the limited space in the tunnel, in order to improve the efficiency of building the steel cage, the steel cage can be prefabricated in sections in the factory, and the prefabricated steel cage can be transported to the tunnel for assembly, thereby improving the efficiency of assembling the steel cage.

[0041] The circumferential reinforcement within the cage, located circumferentially along the tunnel, is a critical load-bearing component of the tunnel lining. It primarily resists the circumferential pressure acting on the tunnel lining, working in conjunction with the concrete to withstand tensile stress, thereby increasing the lining's load-bearing capacity and preventing damage due to rock and soil pressure. However, existing technologies have limited reliability in the connections between adjacent circumferential reinforcement segments. During concrete pouring, these connections are prone to loosening or displacement, disturbing the concrete and increasing the risk of cracks.

[0042] In view of this, an embodiment of the present application provides a steel cage for tunnel formwork lining, wherein at the end positions of adjacent circumferential steel bar segments, first hooks corresponding to each other and second hooks corresponding to each other are overlapped respectively along the longitudinal direction of the tunnel to limit the movement of adjacent circumferential steel bar segments along the longitudinal direction of the tunnel, and the first hooks corresponding to each other and the second hooks overlap 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, the connection parts of the adjacent circumferential steel bar segments are prevented from loosening or displacement, thereby reducing the risk of cracks after concrete forming.

[0043] The steel cage 100 provided in the embodiment of the present application is introduced as follows:

[0044] like Figure 1-2 As shown, the steel cage 100 includes a plurality of circumferential steel bar segments 10, which are arranged circumferentially along the tunnel. The circumferential steel bar segments 10 include a plurality of groups of arc-shaped steel bars arranged along the longitudinal depth 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 a side close to the inner wall of the tunnel, and the second arc-shaped steel bar 12 is located on a side away 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 depth direction of the tunnel.

[0045] 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 cross-arranged along the radial direction of the tunnel.

[0046] Specifically, the first hook 13 may be formed by bending the end of the first arc-shaped steel bar 11 , and the second hook 14 may be formed by bending the end of the second arc-shaped steel bar 12 .

[0047] like Figure 3-4 As shown, at the end positions of adjacent circumferential steel bar segments 10, the corresponding first hooks 13 and the corresponding second hooks 14 are respectively overlapped along the longitudinal direction of the tunnel to limit the movement of the adjacent circumferential steel bar segments 10 along the depth direction of the tunnel, and the corresponding first hooks 13 and second hooks 14 are overlapped to limit the relative rotation of the adjacent circumferential steel bar segments 10.

[0048] like Figure 3-4, showing two adjacent circumferential reinforcement segments 10 among a plurality of circumferential reinforcement segments 10, the two adjacent circumferential reinforcement segments 10 being a first circumferential reinforcement segment 101 and a second circumferential reinforcement segment 102. In each set of arcuate reinforcements in the first circumferential reinforcement segment 101, the second arcuate reinforcements 12 alternate with the first arcuate reinforcements 11 along a first direction X. In each set of arcuate reinforcements in the second circumferential reinforcement segment 102, the first arcuate reinforcements 11 alternate with the second arcuate reinforcements 12 along the first direction X. The first direction X is parallel to the tunnel depth direction.

[0049] The end of the first annular steel bar segment 101 and the end of the second annular steel bar segment 102 are connected to each other. At the end positions of the first annular steel bar segment 101 and the second annular steel bar segment 102, the multiple groups of arcuate steel bars of the first annular steel bar segment 101 and the multiple groups of arcuate steel bars of the second annular steel bar segment 102 correspond one to one. The first hook 13 of the first annular steel bar segment 101 and the first hook 13 of the second annular steel bar segment 102 are overlapped along the longitudinal depth direction of the tunnel, and the second hook 14 of the first annular steel bar segment 101 and the second hook 14 of the second annular steel bar segment 102 are overlapped along the longitudinal depth direction of the tunnel, so that the first annular steel bar segment 101 and the second annular steel bar segment 102 restrict each other to prevent the first annular steel bar segment 101 and the second annular steel bar segment 102 from staggering along the longitudinal depth direction of the tunnel.

[0050] The first hook 13 of the first annular steel bar segment 101 overlaps the second hook 14 of the second annular steel bar segment 102 in the annular direction, and the second hook 14 of the first annular steel bar segment 101 overlaps the first hook 13 of the second annular steel bar segment 102 in the annular direction, so that the first annular steel bar segment 101 and the second annular steel bar segment 102 restrict each other to prevent the first annular steel bar segment 101 and the second annular steel bar segment 102 from rotating relative to each other.

[0051] In this embodiment, the steel cage 100 includes a plurality of circumferential steel bar segments 10, which are prefabricated in a factory. Compared with manual binding of steel bars one by one, the processing precision of the circumferential steel bar segments 10 prefabricated in the factory is high. The prefabricated circumferential steel bar segments 10 are transported to the tunnel for assembly, which improves the construction efficiency compared with the traditional manual binding of single steel bars in the tunnel. Adjacent circumferential steel bar segments 10 are overlapped along the tunnel depth direction by corresponding first hooks 13 and corresponding second hooks 14 to limit the movement of adjacent circumferential steel bar segments 10 along the tunnel depth direction. The corresponding first hooks 13 and second hooks 14 overlap each other to limit the relative rotation of adjacent circumferential steel bar segments 10, so that the adjacent circumferential steel bar segments 10 are in a relatively fixed state after connection, and the integrity of the adjacent circumferential steel bar segments 10 after connection is higher. During the concrete pouring process, the connection parts of the adjacent circumferential steel bar segments 10 are prevented from loosening or displacement, thereby reducing the risk of cracks after concrete forming.

[0052] Furthermore, adjacent circumferential steel bar segments 10 are overlapped along the longitudinal direction of the tunnel by corresponding first hooks 13 and corresponding second hooks 14, thereby 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 one are overlapped, thereby realizing the positioning of the circumferential steel bar segments 10 along the circumference of the tunnel, thereby improving the installation accuracy of the circumferential steel bar segments 10.

[0053] Specifically, the first hook 13 and the second hook 14 respectively have an inclined section 15. At the connection of adjacent annular steel bar segments 10, the inclined section 15 of the first hook 13 of one of the adjacent annular steel bar segments 10 and the inclined section 15 of the second hook 14 of the other overlap each other.

[0054] like Figure 4 As shown, the inclined section 15 of the first hook 13 of the first annular steel bar segment 101 and the inclined section 15 of the second hook 14 of the second annular steel bar segment 102 overlap each other, and the inclined section 15 of the second hook 14 of the first annular steel bar segment 101 and the inclined section 15 of the first hook 13 of the second annular steel bar segment 102 overlap each other.

[0055] In this embodiment, the first hooks 13 and the second hooks 14 corresponding to each other in adjacent annular steel bar segments 10 are overlapped with each other through the inclined section 15 , which can better limit the relative rotation of the adjacent annular steel bar segments 10 .

[0056] 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 annular steel bar segments 10 are more reliably overlapped together, further preventing the adjacent annular steel bar segments 10 from loosening or displacement during the concrete pouring process.

[0057] Specifically, if Figure 4 As shown, welded steel bar segments 17 are respectively provided at the ends of the first hook 13 and the second hook 14. The welded steel bar segments 17 are arc-shaped, and the curvature of the welded steel bar segments 17 is the same as the curvature 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 welded 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 welded steel bar segment 17 at its end.

[0058] In this embodiment, the curvature of the welded steel bar segment 17 is the same as that of the arc-shaped steel bar, which makes it easier to control the welding angle and position during welding, and allows for more convenient operation, making the welded joint more uniform and smooth, and reducing the occurrence of welding defects.

[0059] In a specific embodiment, the overlapping parts of the corresponding first hooks 13 and the overlapping parts of the corresponding second hooks 14 respectively form plug-in holes 16, and the steel cage 100 also includes a first connecting pin 30, which is plugged into the plug-in holes 16. Under the action of the gravity of the annular steel bar segments 10, the adjacent annular steel bar segments 10 are in a tensile and locked state at the position of the first connecting pin 30.

[0060] like Figure 4 As shown, the overlap of the first hook 13 of the first annular steel bar segment 101 and the first hook 13 of the second annular steel bar segment 102 forms an inserting hole 16, and the overlap of the second hook 14 of the first annular steel bar segment 101 and the second hook 14 of the second annular steel bar segment 102 forms another inserting hole 16; the first connecting pin 30 is plugged into and fitted with the inserting hole 16.

[0061] In this embodiment, the first connecting pin 30 is plugged into the plug hole 16 to connect adjacent circumferential steel bar segments 10 , which is easy to operate and improves construction efficiency.

[0062] The first connecting pin 30 can specifically be a steel rod or a plug-in rod made of other metal materials.

[0063] In order to prevent the hook from breaking under the action of tension, 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.

[0064] In a specific embodiment, Figure 1 、 Figure 5 and Figure 6 As shown, the steel cage 100 also includes a longitudinal beam steel segment 20, which is placed on the tunnel ground along the longitudinal depth direction of the tunnel. A plurality of circumferential steel segments 10 arranged circumferentially along the tunnel constitute a circumferential steel assembly, and longitudinal beam steel segments 20 are respectively provided at both ends of the circumferential steel assembly; the longitudinal beam steel segment 20 is provided with a plurality of limiting members 40, and the first hook 13 and the second hook 14 of each group of arc-shaped steel bars in the circumferential steel segment 10 located at the end of the circumferential steel assembly are limitedly matched with the corresponding limiting members 40 to limit the swing of the circumferential steel segment 10 relative to the longitudinal beam steel segment 20.

[0065] The first hook 13 and the second hook 14 of each group of arc-shaped steel bars can respectively cooperate with two different limiting members 40; or, the first hook 13 and the second hook 14 of each group of arc-shaped steel bars can cooperate with the same limiting member 40.

[0066] In this embodiment, the longitudinal beam steel bar segment 20 is prefabricated in a factory, and the prefabricated longitudinal beam steel bar segment 20 is transported to the tunnel for assembly, which improves the construction efficiency compared to the traditional method of manually tying and forming single steel bars in the tunnel. By setting the limiting parts 40 of the longitudinal beam steel bar segment 20, the precise positioning and fixation of the circumferential steel bar segment 10 can be guaranteed, which is conducive to ensuring the assembly accuracy of the steel cage 100.

[0067] Specifically, if Figure 6 As shown, the limiting member 40 is located inside the longitudinal beam steel bar segment 20, and the first hook 13 and the second hook 14 of each group of arc-shaped steel bars in the annular steel bar segment 10 located at the end of the annular steel bar assembly extend into the longitudinal beam steel bar segment 20 and cooperate with the corresponding limiting member 40.

[0068] In this embodiment, the circumferential steel bar segments 10 extend into the interior of the longitudinal beam steel bar segments 20. After the poured concrete is formed, the circumferential steel bar segments 10 and the longitudinal beam steel bar segments 20 form a whole. 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 depth direction. This overall structure can better resist the effects of various complex external forces, improve the seismic resistance, impact resistance and ability of the tunnel structure to resist stratum movement.

[0069] Specifically, the limiting member 40 includes two limiting parts 41 arranged along the longitudinal depth direction of the tunnel, and there is a limiting gap between the two limiting parts 41. The first hook 13 and the second hook 14 of each group of arc-shaped steel bars in the annular steel bar segment 10 located at the end of the annular steel bar assembly are inserted into the limiting gap.

[0070] In a specific embodiment, Figure 5 and Figure 7 As shown, the longitudinal beam steel bar segment 20 includes a plurality of groups of longitudinal beam steel bars 21 arranged along the width direction, and a fitting portion 22 is provided at the end of each group of longitudinal beam steel bars 21; along the longitudinal depth direction of the tunnel, the ends of adjacent longitudinal beam steel bar segments 20 are connected to each other, and the fitting portions 22 of adjacent longitudinal beam steel bar segments 20 are alternately overlapped along the width direction, and connecting holes 25 are formed at alternate positions, and a second connecting pin 60 is inserted into the connecting hole 25. Under the pulling action of adjacent longitudinal beam steel bar segments 20, the adjacent longitudinal beam steel bar segments 20 are in a pulling and locking state at the position of the second connecting pin 60.

[0071] Depending on the tunnel length, two, three or more adjacent longitudinal beam reinforcement segments 20 may be laid.

[0072] In this embodiment, adjacent longitudinal beam steel bar segments 20 are connected by pin-hole connection, which is convenient and quick, and improves construction efficiency. The ends of adjacent longitudinal beam steel bar segments 20 are connected to each other to prevent construction joints from occurring between the two and ensure integrity.

[0073] Specifically, if Figure 7 As 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, and the longitudinal beam steel bar segment 20 also 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 a matching portion 22.

[0074] The two adjacent longitudinal beam steel bar segments 20 are respectively the first longitudinal beam steel bar segment and the second longitudinal beam steel bar segment. Each group of longitudinal beam steel bars 21 of the first longitudinal beam steel bar segment is alternately overlapped with each group of longitudinal beam steel bars 21 of the second longitudinal beam steel bar segment 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. The first connecting hole and the second connecting hole are respectively formed at the top position and the bottom position, and the second connecting pins 60 are respectively inserted into the first connecting hole and the second connecting hole.

[0075] In other embodiments, the matching portion 22 may be a hook provided at the end of the longitudinal beam reinforcement 21 , similar to the way in which the hook provided at the end of the arc-shaped reinforcement is connected to the first connecting pin 30 .

[0076] Specifically, the longitudinal beam steel bar segment 20 also includes multiple stirrups 24 and multiple waist bars 26. The stirrups 24 are arranged around the periphery of multiple groups of longitudinal beam steel bars 21 and welded to the multiple groups of longitudinal beam steel bars 21; the multiple waist bars 26 are cross-arranged in the stirrups 24 and welded to the stirrups 24.

[0077] The limiting member 40 further includes a mounting plate 42 , which is welded to the waist rib 26 , and the limiting portion 41 is welded to the mounting plate 42 .

[0078] In a specific embodiment, Figure 2 、 Figure 3 As shown, the circumferential steel bar segment 10 also includes multiple groups of longitudinal steel bars arranged along the circumference of the tunnel, 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 crosses and is welded with multiple first arc-shaped steel bars 11, and the second longitudinal steel bar 182 crosses and is welded with multiple second arc-shaped steel bars 12.

[0079] In this embodiment, the arc-shaped steel bars and the longitudinal steel bars form a stable spatial network structure, which 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.

[0080] Specifically, the circumferential steel bar segment 10 also includes a plurality of tie bars 19, which are arranged at the intersection of the first arc-shaped steel bar 11 and the first longitudinal steel bar 181 and at the intersection 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 welded to the tie bars 19 respectively.

[0081] In order to improve the cooperative working ability of the annular reinforcement segment 10 when subjected to stress, Figure 2-3 As shown, in each set 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; Figure 8 As shown, the steel cage 100 also includes a support frame 50, which is arranged along the circumference of the tunnel. The multiple circumferential steel bar segments 10 arranged along the circumference of the tunnel are respectively engaged with the support frame 50 through their respective multiple groups of longitudinal steel bars. The support frame 50 is placed in the engaging gap between the end of the first longitudinal steel bar 181 and the end of the second longitudinal steel bar 182 of each of the multiple groups of longitudinal steel bars.

[0082] In this embodiment, the annular steel bar segments 10 can remain relatively fixed with the support frame 50, so that the annular steel bar segments 10 form a continuous integral structure, jointly bear external loads, improve the collaborative working ability of the steel cage 100 when subjected to force, reduce local deformation and stress concentration, and enhance overall stability; the support frame 50 can also play a positioning role, ensuring that the annular steel bar segments 10 maintain the designed position and spacing during installation and concrete pouring, avoiding steel bar displacement, and ensuring that the geometric size and shape of the steel cage 100 meet the design requirements, thereby effectively exerting the bearing capacity of the steel cage 100.

[0083] The support frame 50 may be a grid steel frame or a support frame made of other metal materials.

[0084] like Figure 8 As shown, along the longitudinal direction of the tunnel, the longitudinal reinforcements of two adjacent annular reinforcement segments 10 are both inserted into the support frame 50 .

[0085] The assembly process of the steel cage 100 is described as follows:

[0086] Prefabricate the circumferential steel bar segments 10 and the longitudinal beam steel bar segments 20 in a 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 positions of the side walls on both sides of the tunnel, 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; hoist the support frame 50 into the tunnel, and connect the two ends of the support frame 50 to the two sides respectively. The respective limiting pieces 40 in the longitudinal beam steel bar segments 20 are limited and matched; multiple circumferential steel bar segments 10 are hoisted to the circumferential position of the tunnel, and the ends of the circumferential steel bar segments 10 located on the side walls on both sides of the tunnel are extended into the corresponding longitudinal beam steel bar segments 20, and are limited and matched with the limiting pieces 40; the first connecting pin 30 is inserted into the plug-in hole 16 between adjacent circumferential steel bar segments 10 to connect the multiple circumferential steel bar segments 10 to form a circumferential steel bar assembly; the longitudinal steel bars of the circumferential steel bar assembly are plugged and matched with the support frame 50.

[0087] The assembly process of other annular steel bar components arranged along the longitudinal direction of the tunnel can refer to the above assembly process.

[0088] The above description is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be included in the protection scope of the present application.

Claims

1. A steel cage for tunnel mold lining, characterized in that: include: a plurality of circumferential steel bar segments, the plurality of circumferential steel bar segments being arranged circumferentially along the tunnel, the circumferential steel bar segments comprising a plurality of groups of arcuate steel bars arranged in a longitudinal direction of the tunnel, each group of arcuate steel bars comprising a first arcuate steel bar and a second arcuate steel bar arranged at intervals, the first arcuate steel bar being located on a side close to an inner wall of the tunnel, the second arcuate steel bar being located on a side away from the inner wall of the tunnel, and the first arcuate steel bars and the second arcuate steel bars being arranged alternately 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 circumferential steel bar segments, the corresponding first hooks and the corresponding second hooks are respectively overlapped along the longitudinal direction of the tunnel to restrict the movement of the adjacent circumferential steel bar segments along the longitudinal direction of the tunnel, and the corresponding first hooks and the second hooks are overlapped to restrict the relative rotation of the adjacent circumferential steel bar segments; The overlapping portions of the corresponding first hooks and the overlapping portions of the corresponding second hooks respectively form insertion holes, and the steel cage further comprises a first connecting pin, which is plugged into and matched with the insertion holes. Under the action of the gravity of the annular steel bar segments, the adjacent annular steel bar segments are in a tensioned and locked state at the position of the first connecting pin; 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 circumferential steel segments arranged along the tunnel circumference form a circumferential steel assembly, wherein the longitudinal beam steel segments are respectively provided at both ends of the circumferential steel assembly; The longitudinal beam steel bar segment is provided with a plurality of limiting members, and the first hook and the second hook of each group of arc-shaped steel bars in the circumferential steel bar segment located at the end of the circumferential steel bar assembly are limitedly matched with the corresponding limiting members to limit the swing of the circumferential steel bar segment relative to the longitudinal beam steel bar segment; The longitudinal beam steel bar segment comprises a plurality of groups of longitudinal beam steel bars arranged along the width direction, and the end of each group of longitudinal beam steel bars is provided with a matching portion; Along the depth direction of the tunnel, the ends of adjacent longitudinal beam steel bar segments are connected to each other, and the respective mating portions 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 into the connecting holes. Under the tension of adjacent longitudinal beam steel bar segments, the adjacent longitudinal beam steel bar segments are in a tension-locked state at the position of the second connecting pin; The circumferential steel bar segment also includes multiple groups of longitudinal steel bars arranged along the circumference 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 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.

2. The steel cage according to claim 1, characterized in that The first hook and the second hook each have an inclined section. 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 curvature of the welded steel bar segments is the same as that 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 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 circumferential steel bar segment at the end of the circumferential steel bar assembly extend into the longitudinal beam steel bar segment and cooperate with the corresponding limiting piece.

6. The steel cage according to claim 1, characterized in that: In each set of longitudinal steel bars, the ends of the first longitudinal steel bars extend to the outside of the first arc-shaped steel bars located at the edge, and the ends of the second longitudinal steel bars extend to the outside of the second arc-shaped steel bars located at the edge; The steel cage also includes a support frame, which is arranged along the circumference of the tunnel. The multiple circumferential steel bar segments arranged along the circumference 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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