Segmented support device for tunnel section

Abstract

The present invention discloses a segmented support device for a tunnel cross-section. Connecting plates are respectively fixed on the vertical sections of the frame on both sides of the fixed frame. A corresponding first clamping seat is installed on each connecting plate, and the connecting plate can slide on the corresponding first clamping seat. Each first clamping seat is connected to the corresponding tunnel bottom section support plate through a first fixing plate. First connecting seats are respectively fixed on the inclined sections of the frame on both sides of the fixed frame. A corresponding second clamping seat is installed on each first connecting seat, and the first connecting seat can slide on the corresponding second clamping seat. Each second clamping seat is connected to the corresponding tunnel middle section support plate through a second fixing plate. Two second connecting seats are fixed on the top section of the frame of the fixed frame. A corresponding third clamping seat is installed on each second connecting seat, and the second connecting seat can slide on the corresponding third clamping seat. Each third clamping seat is fixedly connected to the corresponding tunnel top section support plate through a corresponding third fixing plate. The present invention facilitates the segmented support of the tunnel cross-section.

Description

Technical Field

[0001] The present invention relates to the technical field of large cross-section tunnel construction, and specifically refers to a segmented support device for tunnel cross-sections. Background Technique

[0002] During the construction of large cross-section tunnels, in order to ensure the stable force of the large cross-section of the tunnel and avoid tunnel collapse caused by uneven force, our requirements for the support of large cross-section tunnel construction are getting higher and higher. We hope to improve the working efficiency of the large cross-section tunnel support device through innovation, facilitate segmented support, improve the usage efficiency, and make it play the greatest value. With the development of technology, the segmented support device for tunnel cross-sections has developed to a great extent. Its development has brought great convenience to people when carrying out segmented support for the large cross-section of the tunnel, and its types and quantities are also increasing day by day.

[0003] Currently, there are a very large number of support devices for tunnel cross-sections on the market (such as the Chinese patent "A Method for Excavating a Diversion Tunnel of a Quake Lake" with the patent number 201910454841.2, and the Chinese patent "A Landslide Drainage Tunnel and Its Construction Method" with the patent number 201910796882.X). These support devices are mostly of integral structure, with limited adaptability to the support environment, and are very troublesome to install, disassemble and transport. Summary of the Invention

[0004] The purpose of the present invention is to provide a segmented support device for tunnel cross-sections. This device realizes the segmented support of the tunnel cross-section, has good support effect, and is convenient for installation and disassembly.

[0005] To achieve this purpose, a segmented support device for tunnel cross-sections designed by the present invention is characterized in that it includes a tunnel cross-section fixed frame, a first fixing plate, a tunnel bottom section support plate, a second fixing plate, a tunnel middle section support plate, a third fixing plate and a tunnel top section support plate. Among them, connecting plates are respectively fixed on the vertical sections of the frames on both sides of the cross-section fixed frame. A corresponding first clamping seat is installed on each connecting plate, and the connecting plate can slide along the tunnel length direction on the corresponding first clamping seat. A corresponding first fixing plate is fixed on each first clamping seat, and each first fixing plate is fixedly connected to the corresponding tunnel bottom section support plate. First connecting seats are respectively fixed on the inclined sections of the frames on both sides of the cross-section fixed frame. A corresponding second clamping seat is installed on each first connecting seat, and the first connecting seat can slide along the tunnel length direction on the corresponding second clamping seat. Each second clamping seat is connected to the corresponding tunnel middle section support plate through the corresponding second fixing plate; two second connecting seats are fixed on the top section of the frame of the cross-section fixed frame. A corresponding third clamping seat is installed on each second connecting seat, and the second connecting seat can slide along the tunnel length direction on the corresponding third clamping seat. Each third clamping seat is fixedly connected to the corresponding tunnel top section support plate through the corresponding third fixing plate.

[0006] The cross-section fixing frame includes an outer frame, a left vertical support rod, a right vertical support rod, a left horizontal support rod, a right horizontal support rod, a middle horizontal support rod, a left vertical auxiliary support rod, and a right vertical auxiliary support rod. Among them, the outer frame is composed of frame vertical segments on the left and right sides, frame inclined segments on the left and right sides, and a frame top segment. The tops of the left vertical support rod and the right vertical support rod are fixed on the frame top segment, and the left vertical support rod and the right vertical support rod are symmetric about the vertical center line of the tunnel cross-section fixing frame. One end of the left horizontal support rod is fixedly connected to the bottom of the left frame inclined segment, and the other end of the left horizontal support rod is fixedly connected to the left vertical support rod. One end of the right horizontal support rod is fixedly connected to the bottom of the right frame inclined segment, and the other end of the right horizontal support rod is fixedly connected to the right vertical support rod. One end of the middle horizontal support rod is fixedly connected to the upper segment of the left vertical support rod, and the other end of the middle horizontal support rod is fixedly connected to the upper segment of the right vertical support rod;

[0007] The left vertical auxiliary support rod and the right vertical auxiliary support rod are fixed between the middle horizontal support rod and the frame top segment, and the left vertical auxiliary support rod and the right vertical auxiliary support rod are symmetric about the vertical center line of the tunnel cross-section fixing frame.

[0008] In the above technical solution, it further includes four strip-shaped bases. The four strip-shaped bases are fixed on the ground of the tunnel. A raised limiting strip is fixed at the top end of each strip-shaped base. The raised limiting strips of each strip-shaped base are parallel to the length direction of the tunnel. Steel frame support feet are fixed at the bottom ends of the frame vertical segments on the left and right sides, the left vertical support rod, and the right vertical support rod. Each steel frame support foot has a concave chute. The frame vertical segments on the left and right sides, the left vertical support rod, and the right vertical support rod are respectively arranged on the raised limiting strips of the corresponding strip-shaped bases through the steel frame support feet, and the frame vertical segments on the left and right sides, the left vertical support rod, and the right vertical support rod can synchronously slide along the length direction of the tunnel on the raised limiting strips of the corresponding strip-shaped bases through the concave chutes of the steel frame support feet.

[0009] The present invention has the following beneficial effects:

[0010] 1. The present invention is provided with steel frame support feet and bases. When it is necessary to position and install the fixed steel frame, align the steel frame support feet at the bottom of the fixed steel frame with the bases, so that the steel frame support feet are engaged into the bases, and then use other traction devices to push the fixed steel frame into the large cross-section of the tunnel, so that the fixed steel frame moves on the bases, thereby facilitating the positioning and installation of the fixed steel frame;

[0011] 2. The present invention is provided with a first clamping seat and a second clamping seat. When it is necessary to support the large cross-section of the tunnel in sections, first install the first fixing plate, the second fixing plate, and the third fixing plate into the first support plate, the second support plate, and the third support plate respectively, and then snap the first clamping seat and the second clamping seat into the first fixing plate, the second fixing plate, and the third fixing plate respectively, so as to facilitate the sectional support of the large cross-section of the tunnel. Moreover, the above structure has high support reliability and is convenient for installation and disassembly. Compared with the traditional integral support method, the present invention can adapt to more application environments and has better flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the schematic cross-sectional structure view of the main view of the present invention;

[0013] Figure 2 is Figure 1 the partial enlarged structure view at A in

[0014] Figure 3 is Figure 1 the partial enlarged structure view at B in

[0015] Figure 4 is Figure 2 the side view of

[0016] Figure 5 is Figure 3 the side view of

[0017] Wherein, 1 - tunnel cross-section fixed frame, 1.1 - frame vertical section, 1.2 - frame inclined section, 1.3 - frame top section, 1.4 - left vertical support rod, 1.5 - right vertical support rod, 1.6 - left horizontal support rod, 1.7 - right horizontal support rod, 1.8 - middle horizontal support rod, 1.9 - left vertical auxiliary support rod, 1.10 - right vertical auxiliary support rod, 2 - steel frame foot plate, 2.1 - concave chute, 3 - strip-shaped base, 3.1 - convex limit strip, 4 - chute, 5 - strip-shaped hole, 6 - inclined auxiliary support, 7 - connecting plate, 8 - first clamping seat, 8.1 - tunnel axial chute, 9 - first fixing plate, 10 - tunnel bottom section support plate, 11 - first connecting seat, 12 - second connecting seat, 13 - second clamping seat, 14 - nut, 15 - bolt, 16 - second fixing plate, 17 - tunnel middle section support plate, 18 - third fixing plate, 19 - tunnel top section support plate, 20 - sliding head, 21 - third clamping seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further elaborates the present invention in detail in conjunction with the drawings and specific embodiments:

[0019] As Figure 1A segmented support device for a tunnel cross-section as shown, which includes a tunnel cross-section fixed frame 1, a first fixing plate 9, a tunnel bottom section support plate 10, a second fixing plate 16, a tunnel middle section support plate 17, a third fixing plate 18, and a tunnel top section support plate 19. Among them, connecting plates 7 are respectively fixed on the vertical frame sections 1.1 on both sides of the cross-section fixed frame 1. A corresponding first clamping seat 8 is installed on each connecting plate 7, and the connecting plate 7 can slide along the tunnel length direction on the corresponding first clamping seat 8. A corresponding first fixing plate 9 is fixed on each first clamping seat 8, and each first fixing plate 9 is fixedly connected to the corresponding tunnel bottom section support plate 10. First connecting seats 11 are respectively fixed on the inclined frame sections 1.2 on both sides of the cross-section fixed frame 1. A corresponding second clamping seat 13 is installed on each first connecting seat 11, and the first connecting seat 11 can slide along the tunnel length direction on the corresponding second clamping seat 13. Each second clamping seat 13 is connected to the corresponding tunnel middle section support plate 17 through the corresponding second fixing plate 16; two second connecting seats 12 are fixed on the top frame section 1.3 of the cross-section fixed frame 1. A corresponding third clamping seat 21 is installed on each second connecting seat 12, and the second connecting seat 12 can slide along the tunnel length direction on the corresponding third clamping seat 21. Each third clamping seat 21 is fixedly connected to the corresponding tunnel top section support plate 19 through the corresponding third fixing plate 18.

[0020] In the above technical solution, the cross-section fixed frame 1 includes an outer frame, a left vertical support rod 1.4, a right vertical support rod 1.5, a left horizontal support rod 1.6, a right horizontal support rod 1.7, a middle horizontal support rod 1.8, a left vertical auxiliary support rod 1.9, and a right vertical auxiliary support rod 1.10. Among them, the outer frame is composed of the vertical frame sections 1.1 on the left and right sides, the inclined frame sections 1.2 on the left and right sides, and the top frame section 1.3. The tops of the left vertical support rod 1.4 and the right vertical support rod 1.5 are fixed on the top frame section 1.3, and the left vertical support rod 1.4 and the right vertical support rod 1.5 are symmetrical about the vertical center line of the tunnel cross-section fixed frame 1. One end of the left horizontal support rod 1.6 is fixedly connected to the bottom of the left inclined frame section 1.2, and the other end of the left horizontal support rod 1.6 is fixedly connected to the left vertical support rod 1.4. One end of the right horizontal support rod 1.7 is fixedly connected to the bottom of the right inclined frame section 1.2, and the other end of the right horizontal support rod 1.7 is fixedly connected to the right vertical support rod 1.5. One end of the middle horizontal support rod 1.8 is fixedly connected to the upper section of the left vertical support rod 1.4, and the other end of the middle horizontal support rod 1.8 is fixedly connected to the upper section of the right vertical support rod 1.5;

[0021] The left vertical auxiliary support rod 1.9 and the right vertical auxiliary support rod 1.10 are fixed between the middle horizontal support rod 1.8 and the top section 1.3 of the frame. The left vertical auxiliary support rod 1.9 and the right vertical auxiliary support rod 1.10 are symmetric about the vertical center line of the tunnel section fixing frame 1.

[0022] In the above technical solution, it further includes four strip-shaped bases 3. The four strip-shaped bases 3 are fixed on the ground of the tunnel. A raised limit strip 3.1 is fixed at the top end of each strip-shaped base 3. The raised limit strip 3.1 of each strip-shaped base 3 is parallel to the length direction of the tunnel. The bottom ends of the left and right frame vertical segments 1.1, the left vertical support rod 1.4, and the right vertical support rod 1.5 are all fixed with steel frame foot plates 2. Each steel frame foot plate 2 has a concave chute 2.1. The left and right frame vertical segments 1.1, the left vertical support rod 1.4, and the right vertical support rod 1.5 are respectively arranged on the raised limit strip 3.1 of the corresponding strip-shaped base 3 through the steel frame foot plates 2, and the left and right frame vertical segments 1.1, the left vertical support rod 1.4, and the right vertical support rod 1.5 can synchronously slide along the length direction of the tunnel on the raised limit strip 3.1 of the corresponding strip-shaped base 3 through the concave chute 2.1 of the steel frame foot plate 2. The length of the strip-shaped base 3 is 12 - 15 m. The above structure can facilitate the positioning and installation of the tunnel section fixing frame 1 and prevent the tunnel section fixing frame 1 from shifting.

[0023] In the above technical solution, the tunnel bottom section support plate 10, the tunnel middle section support plate 17, and the tunnel top section support plate 19 form the concrete lining of the tunnel. The two ends of the tunnel top section support plate 19 are respectively fixedly connected to the corresponding tunnel middle section support plates 17, and the two tunnel middle section support plates 17 are respectively fixedly connected to the corresponding two tunnel bottom section support plates 10.

[0024] A clamping structure is formed between the tunnel middle section support plate 17 and the second fixing plate 16, a clamping structure is formed between the first fixing plate 9 and the tunnel bottom section support plate 10, and a clamping structure is formed between the third fixing plate 18 and the tunnel top section support plate 19. By using the clamping structure between the support plate and the fixing plate, the steps of installing the support plate can be reduced, thus facilitating the installation of the tunnel support plate.

[0025] In the above technical solution, an inclined auxiliary bracket 6 is fixed between the left frame vertical section 1.1 and the left horizontal support rod 1.6, an inclined auxiliary bracket 6 is fixed between the left vertical support rod 1.4 and the left horizontal support rod 1.6, an inclined auxiliary bracket 6 is fixed between the right frame vertical section 1.1 and the right horizontal support rod 1.7, an inclined auxiliary bracket 6 is fixed between the right vertical support rod 1.5 and the right horizontal support rod 1.7, an inclined auxiliary bracket 6 is fixed between the top of the left frame inclined section 1.2 and the other end of the left horizontal support rod 1.6, an inclined auxiliary bracket 6 is fixed between the top of the right frame inclined section 1.2 and the other end of the right horizontal support rod 1.7, an inclined auxiliary bracket 6 is fixed between the middle section of the left vertical support rod 1.4 and the middle horizontal support rod 1.8, and an inclined auxiliary bracket 6 is fixed between the middle section of the right vertical support rod 1.5 and the middle horizontal support rod 1.8. A triangular structure is formed between the inclined auxiliary bracket 6 and the tunnel section fixing frame 1. By using the triangular structure between the inclined auxiliary bracket 6 and the tunnel section fixing frame 1, the stability of the tunnel section fixing frame 1 itself can be ensured when using the tunnel section fixing frame 1, which is convenient for bearing force.

[0026] In the above technical solution, each first card seat 8 is provided with a tunnel axial chute 8.1 arranged along the tunnel length direction, and the connecting plate 7 is arranged in the corresponding tunnel axial chute 8.1 and can slide along the tunnel length direction in the tunnel axial chute 8.1.

[0027] In the above technical solution, the two tunnel middle section support plates 17 are symmetrically distributed about the vertical center line of the tunnel section fixing frame 1; the two tunnel bottom section support plates 10 are symmetrically distributed about the vertical center line of the tunnel section fixing frame 1.

[0028] In the above technical solution, the two connecting plates 7 are symmetrically distributed about the vertical center line of the tunnel section fixing frame 1; the two first connection seats 11 are symmetrically distributed about the vertical center line of the tunnel section fixing frame 1; the two second connection seats 12 are symmetrically distributed about the vertical center line of the tunnel section fixing frame 1.

[0029] In the above technical solution, the bent sections at both ends of the first fixing plate 9 are embedded into the tunnel bottom section support plate 10 so that the first fixing plate 9 is fixedly connected to the tunnel bottom section support plate 10, the bent sections at both ends of the second fixing plate 16 are embedded into the tunnel middle section support plate 17 so that the second fixing plate 16 is fixedly connected to the tunnel middle section support plate 17, and the bent sections at both ends of the third fixing plate 18 are embedded into the tunnel top section support plate 19 so that the third fixing plate 18 is fixedly connected to the tunnel top section support plate 19.

[0030] In the above technical solution, each first connecting seat 11 is provided with a sliding head 20, the second clamping seat 13 is provided with a chute 4 along the length direction of the tunnel, strip-shaped holes 5 are provided on both side walls of the chute 4 of the second clamping seat 13, a threaded hole is provided on the sliding head 20 of the first connecting seat 11, one end of a bolt 15 passes through the strip-shaped hole 5 on one side of the chute 4 of the second clamping seat 13 and is threadedly connected to the threaded hole of the sliding head 20 of the first connecting seat 11, and passes through this threaded hole, and one end of the bolt 15 passes through the strip-shaped hole 5 on the other side of the chute 4 of the second clamping seat 13 and then connects a nut 14. While the sliding head 20 of the first connecting seat 11 can slide in the chute 4 of the second clamping seat 13, the bolt 15 on the sliding head 20 can slide in the strip-shaped hole 5;

[0031] Each second connecting seat 12 is provided with a sliding head 20, the third clamping seat 21 is provided with a chute 4 along the length direction of the tunnel, strip-shaped holes 5 are provided on both side walls of the chute 4 of the third clamping seat 21, a threaded hole is provided on the sliding head 20 of the second connecting seat 12, one end of a bolt 15 passes through the strip-shaped hole 5 on one side of the chute 4 of the third clamping seat 21 and is threadedly connected to the threaded hole of the sliding head 20 of the second connecting seat 12, and passes through this threaded hole, and one end of the bolt 15 passes through the strip-shaped hole 5 on the other side of the chute 4 of the third clamping seat 21 and then connects a nut 14. While the sliding head 20 of the second connecting seat 12 can slide in the chute 4 of the third clamping seat 21, the bolt 15 on the sliding head 20 can slide in the strip-shaped hole 5. The above structure can facilitate the fixing and disassembly between the first connecting seat 11 and the second clamping seat 13, and between the second connecting seat 12 and the third clamping seat 21, and the bolt 15 and the nut 14 can prevent the sliding head 20 from coming out, ensuring the safe use of the device.

[0032] The working process of the present invention is as follows: When using the sectional support device for the tunnel cross-section, first, position and install the tunnel cross-section fixing frame 1, align the steel frame support foot plate 2 at the bottom of the tunnel cross-section fixing frame 1 with the base 3, so that the steel frame support foot plate 2 is engaged into the base 3, and then use other traction equipment to push the tunnel cross-section fixing frame 1 into the large cross-section of the tunnel, so that the tunnel cross-section fixing frame 1 moves on the base 3. When it is necessary to sectionally support the large cross-section of the tunnel, first install the first fixing plate 9, the second fixing plate 16 and the third fixing plate 18 into the tunnel bottom section support plate 10, the tunnel middle section support plate 17 and the tunnel top section support plate 19 respectively, then engage the first clamping seat 8, the second clamping seat 13 and the third clamping seat 21 into the first fixing plate 9, the second fixing plate 16 and the third fixing plate 18 respectively, then install the bolt 15 on the second clamping seat 13 and the third clamping seat 21, and then use the matching nut to tighten, so that the tunnel cross-section fixing frame 1 sectionally supports the tunnel bottom section support plate 10, the tunnel middle section support plate 17 and the tunnel top section support plate 19.

[0033] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

Claims

1. A segmented support device for a tunnel cross-section, characterized in that, It includes a tunnel section fixed frame (1), a first fixed plate (9), a tunnel bottom section support plate (10), a second fixed plate (16), a tunnel middle section support plate (17), a third fixed plate (18) and a tunnel top section support plate (19). Among them, connecting plates (7) are respectively fixed on the vertical sections (1.1) of the frame on both sides of the section fixed frame (1). A corresponding first clamping seat (8) is installed on each connecting plate (7), and the connecting plate (7) can slide along the tunnel length direction on the corresponding first clamping seat (8). A corresponding first fixed plate (9) is fixed on each first clamping seat (8), and each first fixed plate (9) is fixedly connected to the corresponding tunnel bottom section support plate (10). First connecting seats (11) are respectively fixed on the inclined sections (1.2) of the frame on both sides of the section fixed frame (1). A corresponding second clamping seat (13) is installed on each first connecting seat (11), and the first connecting seat (11) can slide along the tunnel length direction on the corresponding second clamping seat (13). Each second clamping seat (13) is connected to the corresponding tunnel middle section support plate (17) through the corresponding second fixed plate (16); Two second connecting seats (12) are fixed on the top section (1.3) of the frame of the section fixed frame (1). A corresponding third clamping seat (21) is installed on each second connecting seat (12), and the second connecting seat (12) can slide along the tunnel length direction on the corresponding third clamping seat (21). Each third clamping seat (21) is fixedly connected to the corresponding tunnel top section support plate (19) through the corresponding third fixed plate (18).

2. The sectional support device for a tunnel cross-section according to claim 1, wherein: The section fixed frame (1) includes an outer frame, a left vertical support rod (1.4), a right vertical support rod (1.5), a left horizontal support rod (1.6), a right horizontal support rod (1.7), a middle horizontal support rod (1.8), a left vertical auxiliary support rod (1.9) and a right vertical auxiliary support rod (1.10). Among them, the outer frame is composed of the vertical sections (1.1) of the frame on the left and right sides, the inclined sections (1.2) of the frame on the left and right sides and the top section (1.3) of the frame. The tops of the left vertical support rod (1.4) and the right vertical support rod (1.5) are fixed on the top section (1.3) of the frame, and the left vertical support rod (1.4) and the right vertical support rod (1.5) are symmetric about the vertical center line of the tunnel section fixed frame (1). One end of the left horizontal support rod (1.6) is fixedly connected to the bottom of the left inclined section (1.2) of the frame, and the other end of the left horizontal support rod (1.6) is fixedly connected to the left vertical support rod (1.4). One end of the right horizontal support rod (1.7) is fixedly connected to the bottom of the right inclined section (1.2) of the frame, and the other end of the right horizontal support rod (1.7) is fixedly connected to the right vertical support rod (1.5). One end of the middle horizontal support rod (1.8) is fixedly connected to the upper section of the left vertical support rod (1.4), and the other end of the middle horizontal support rod (1.8) is fixedly connected to the upper section of the right vertical support rod (1.5); The left vertical auxiliary support rod (1.9) and the right vertical auxiliary support rod (1.10) are fixed between the middle horizontal support rod (1.8) and the top section of the frame (1.3), and the left vertical auxiliary support rod (1.9) and the right vertical auxiliary support rod (1.10) are symmetric about the vertical center line of the tunnel section fixing frame (1).

3. The sectional support device for tunnel cross-section according to claim 2, characterized in that: It further includes four strip-shaped bases (3), the four strip-shaped bases (3) are fixed on the ground of the tunnel, a convex limiting strip (3.1) is fixed at the top end of each strip-shaped base (3), the convex limiting strips (3.1) of each strip-shaped base (3) are parallel to the length direction of the tunnel, and the bottom ends of the left and right frame vertical sections (1.1), the left vertical support rod (1.4) and the right vertical support rod (1.5) are all fixed with steel frame supporting feet (2). Each steel frame supporting foot (2) has a concave chute (2.1). The left and right frame vertical sections (1.1), the left vertical support rod (1.4) and the right vertical support rod (1.5) are respectively arranged on the convex limiting strips (3.1) of the corresponding strip-shaped bases (3) through the steel frame supporting feet (2), and the left and right frame vertical sections (1.1), the left vertical support rod (1.4) and the right vertical support rod (1.5) can synchronously slide along the length direction of the tunnel on the convex limiting strips (3.1) of the corresponding strip-shaped bases (3) through the concave chutes (2.1) of the steel frame supporting feet (2).

4. The sectional support device for tunnel cross-section according to claim 2, characterized in that: The tunnel bottom section support plate (10), the tunnel middle section support plate (17) and the tunnel top section support plate (19) form the concrete lining of the tunnel. The two ends of the tunnel top section support plate (19) are respectively fixedly connected to the corresponding tunnel middle section support plates (17), and the two tunnel middle section support plates (17) are respectively fixedly connected to the corresponding two tunnel bottom section support plates (10).

5. The sectional support device for a tunnel cross-section according to claim 2, characterized in that: An inclined auxiliary bracket (6) is fixed between the left frame vertical section (1.1) and the left horizontal support rod (1.6), an inclined auxiliary bracket (6) is fixed between the left vertical support rod (1.4) and the left horizontal support rod (1.6), an inclined auxiliary bracket (6) is fixed between the right frame vertical section (1.1) and the right horizontal support rod (1.7), an inclined auxiliary bracket (6) is fixed between the right vertical support rod (1.5) and the right horizontal support rod (1.7), an inclined auxiliary bracket (6) is fixed between the top of the left frame inclined section (1.2) and the other end of the left horizontal support rod (1.6), an inclined auxiliary bracket (6) is fixed between the top of the right frame inclined section (1.2) and the other end of the right horizontal support rod (1.7), an inclined auxiliary bracket (6) is fixed between the middle section of the left vertical support rod (1.4) and the middle horizontal support rod (1.8), and an inclined auxiliary bracket (6) is fixed between the middle section of the right vertical support rod (1.5) and the middle horizontal support rod (1.8).

6. The segmented support device for a tunnel cross-section according to claim 1, characterized in that: Each first card seat (8) is provided with a tunnel axial chute (8.1) arranged along the length direction of the tunnel. The connecting plate (7) is arranged in the corresponding tunnel axial chute (8.1) and can slide along the length direction of the tunnel in the tunnel axial chute (8.1).

7. The sectional support device for a tunnel cross-section according to claim 1, characterized in that: The two tunnel middle section support plates (17) are symmetrically distributed about the vertical center line of the tunnel cross-section fixing frame (1); the two tunnel bottom section support plates (10) are symmetrically distributed about the vertical center line of the tunnel cross-section fixing frame (1).

8. The sectional support device for a tunnel cross-section according to claim 1, characterized in that: The two connecting plates (7) are symmetrically distributed about the vertical center line of the tunnel cross-section fixing frame (1); the two first connecting seats (11) are symmetrically distributed about the vertical center line of the tunnel cross-section fixing frame (1); the two second connecting seats (12) are symmetrically distributed about the vertical center line of the tunnel cross-section fixing frame (1).

9. The segmented support device for a tunnel cross-section according to claim 1, characterized in that: The bent sections at both ends of the first fixing plate (9) are embedded in the tunnel bottom section support plate (10) so that the first fixing plate (9) is fixedly connected to the tunnel bottom section support plate (10). The bent sections at both ends of the second fixing plate (16) are embedded in the tunnel middle section support plate (17) so that the second fixing plate (16) is fixedly connected to the tunnel middle section support plate (17). The bent sections at both ends of the third fixing plate (18) are embedded in the tunnel top section support plate (19) so that the third fixing plate (18) is fixedly connected to the tunnel top section support plate (19).

10. The sectional support device for a tunnel cross-section according to claim 1, characterized in that: Each first connecting seat (11) is provided with a sliding head (20). The second card seat (13) is provided with a chute (4) along the length direction of the tunnel. Strip-shaped holes (5) are provided on both side walls of the chute (4) of the second card seat (13). A threaded hole is provided on the sliding head (20) of the first connecting seat (11). One end of a bolt (15) passes through the strip-shaped hole (5) on one side of the chute (4) of the second card seat (13) and is threadedly connected to the threaded hole of the sliding head (20) of the first connecting seat (11), and passes through this threaded hole. And one end of the bolt (15) passes through the strip-shaped hole (5) on the other side of the chute (4) of the second card seat (13) and is connected to a nut (14). While the sliding head (20) of the first connecting seat (11) can slide in the chute (4) of the second card seat (13), the bolt (15) on the sliding head (20) can slide in the strip-shaped hole (5). Each second connecting seat (12) is provided with a sliding head (20). The third card seat (21) is provided with a chute (4) along the length direction of the tunnel. Strip-shaped holes (5) are provided on both side walls of the chute (4) of the third card seat (21). A threaded hole is provided on the sliding head (20) of the second connecting seat (12). One end of a bolt (15) passes through the strip-shaped hole (5) on one side of the chute (4) of the third card seat (21) and is threadedly connected to the threaded hole of the sliding head (20) of the second connecting seat (12), and passes through this threaded hole. And one end of the bolt (15) passes through the strip-shaped hole (5) on the other side of the chute (4) of the third card seat (21) and is connected to a nut (14). While the sliding head (20) of the second connecting seat (12) can slide in the chute (4) of the third card seat (21), the bolt (15) on the sliding head (20) can slide in the strip-shaped hole (5).

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