Round tunnel construction method

Abstract

The invention relates to a circular tunnel construction method. The circular tunnel construction process comprises the steps that A, a tunnel inner cavity is built; b, tunnel side wall waterproof layer construction; and C, building a concrete layer and installing a decorative panel. According to the construction method of the circular tunnel with the good anti-seepage effect, the problem that the tunnel is prone to seepage is solved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a circular tunnel construction method. Background Art

[0002] In the process of road traffic construction, it is often necessary to build tunnels. There are several methods of tunnel construction: Full-section excavation method: The full-section excavation method is a construction method that blasts the surface once according to the designed outline and then builds the lining. Step method construction: the step method is to first excavate the upper section, and then excavate the lower section at the same time after excavating to a certain length. The upper and lower sections are excavated simultaneously. Circular excavation and core soil retention method; The middle partition wall method is a construction method in which one side of the tunnel is excavated first, and the middle partition wall is constructed in a large-span tunnel with weak surrounding rock, and then the other side is excavated. It is mainly used in double-line tunnels with Grade IV surrounding rock and deep buried hard rock sections and old loess tunnel sections. The cross-partition wall method is to first excavate one or two parts on one side of the tunnel in a large-span tunnel with soft surrounding rock, construct partial partition walls and cross diaphragms, and then excavate one or two parts on the other side of the tunnel.

[0003] The full-face excavation method is to dig an inner hole of the required size in the area where the tunnel is to be built, and build the tunnel wall inside the inner hole to support it to prevent the tunnel from collapsing. When the geology of the area where the tunnel is located is soil, it is easy to cause seepage and leakage. Summary of the invention

[0004] The invention aims to provide a circular tunnel construction method with good anti-leakage effect, which solves the problem that the tunnel is prone to seepage.

[0005] The above technical problems are solved by the following technical solutions: a circular tunnel construction method, the tunnel is surrounded by a circular tunnel side wall and a tunnel bottom wall of a planar structure, the tunnel side wall and the tunnel bottom wall are both concrete structures, the geology of the area where the tunnel is located is soil, the tunnel side wall includes an arc-shaped top surface segment, an arc-shaped left side surface segment whose upper end is connected to the left end of the arc-shaped top surface segment, and an arc-shaped right side surface segment whose upper end is connected to the right end of the arc-shaped top surface segment, the upper surface of the arc-shaped top surface segment is cast with a top surface waterproof steel plate, the lower surface is cast with a top surface decorative panel, and the left surface of the arc-shaped left side surface segment is cast with a left side surface The process of constructing a circular tunnel is as follows: A. Constructing the tunnel cavity: dig an inner hole of a set length in the area of ​​the tunnel under construction. The inner hole is located inside the design position of the outer contour of the tunnel side wall. The distance between the circumference of the inner hole and the design position of the outer contour of the tunnel side wall is more than ten centimeters. B. Construction of the tunnel side wall waterproof layer: align the top waterproof steel plate with the top wall of the inner hole, align the left waterproof steel plate with the left wall of the inner hole and the right side. The top waterproof steel plate is aligned with the right wall of the tunnel, and the top waterproof steel plate is squeezed upward by the extrusion mechanism so that the soil of the top wall of the inner hole is compressed to the design position of the outer contour of the tunnel side wall, the left side waterproof steel plate is squeezed to the left so that the soil of the left side wall of the inner hole is compressed to the design position of the outer contour of the tunnel side wall, and the right side waterproof steel plate is squeezed to the right so that the soil of the right side wall of the inner hole is compressed to the design position of the outer contour of the tunnel side wall; C. Building concrete layer and installing decorative panels: The left template is supported by the extrusion mechanism and the left side decorative panel is supported on the left side of the left template so that the left side decorative panel and the left side decorative panel are An arc-shaped left side segment cavity is formed between the waterproof steel plates, the right formwork is supported and the right side face decorative panel is supported on the right side of the right formwork, so that an arc-shaped right side segment cavity is formed between the right side face decorative panel and the right side face waterproof steel plate, and the upper formwork is supported and the top face decorative panel is supported on the upper side of the upper formwork, so that an arc-shaped top face segment cavity is formed between the top face decorative panel and the top face waterproof steel plate, concrete is poured into the arc-shaped left side segment cavity and solidified into an arc-shaped left side segment, poured into the arc-shaped right side segment cavity and solidified into an arc-shaped right side segment, and poured into the arc-shaped top face segment cavity and solidified into an arc-shaped top face segment. The outer soil of the tunnel side wall is compacted, which can effectively prevent water from leaking into the tunnel. The steel plate is used as a water retaining layer, which can not only retain water but also serve as a tool for compacting the hole wall. The compaction and installation of the waterproof layer are completed in one step. The decorative panel is cast together with the tunnel side wall. Not only does it not need to be drilled and installed, which will reduce the strength of the tunnel side wall, but it also has a firm and reliable connection. It can also serve as a demoulding layer for mold demoulding, so that there is no need to pad plastic film or apply release agent for demoulding during casting.

[0006] Preferably, the upper end surface of the left side waterproof steel plate is supported on the left end surface of the top face waterproof steel plate, the upper end surface of the left side waterproof steel plate and the left end surface of the top face waterproof steel plate are butted together through the left bevel, and the inner end of the outer end of the left bevel is higher; the upper end surface of the right side waterproof steel plate is supported on the right end surface of the top face waterproof steel plate, the upper end surface of the right side waterproof steel plate and the right end surface of the top face waterproof steel plate are butted together through the right bevel, and the inner end of the outer end of the right bevel is higher; in step B, the extrusion mechanism first presses the top face waterproof steel plate upward so that the soil of the top wall of the inner hole is compressed to the outer contour design position of the tunnel side wall, then presses the left side waterproof steel plate to the left so that the soil of the left side wall of the inner hole is compressed to the outer contour design position of the tunnel side wall, and presses the right side waterproof steel plate to the right so that the soil of the right side wall of the inner hole is compressed to the outer contour design position of the tunnel side wall. It can prevent leakage from the docking of the waterproof steel plates.

[0007] As a preference, it also includes an upper reinforcing frame supported on the lower surface of the top face waterproof steel plate, a left reinforcing frame supported on the right surface of the left face waterproof steel plate, and a right reinforcing frame supported on the left surface of the right face waterproof steel plate. The left and right ends of the top face waterproof steel plate are both beyond the upper reinforcing frame, the upper end of the left reinforcing frame is located above the upper end of the left face waterproof steel plate, and the upper end of the right reinforcing frame is located above the upper end of the right face waterproof steel plate. In step B, the extrusion mechanism removes the top face waterproof steel plate through the upper reinforcing frame, removes the left face waterproof steel plate through the left reinforcing frame, and removes the right face waterproof steel plate through the right reinforcing frame. The left and right ends of the top face waterproof steel plate can be deformed downward during the extrusion process, the upper ends of the left and right side face waterproof steel plates are not deformed, and the left face waterproof steel plate corrects the two ends of the top face waterproof steel plate when it is in place, so that the fit at the interface is tighter, thereby improving the waterproof effect.

[0008] Preferably, the top wall of the inner hole is an arc shape concentric with the outer contour of the tunnel side wall, so that when the top surface waterproof steel plate enters the inner hole and squeezes the soil, the thickness of the soil squeezed by the two ends of the top surface waterproof steel plate is thick, so that the two sections of the top surface waterproof steel plate are subjected to large force when being squeezed, and the large force can better ensure that the two ends of the top surface waterproof steel plate are bent and deformed.

[0009] Preferably, the upper surface of the top face waterproof steel plate is provided with a top face anti-corrosion layer, the left end of the top face anti-corrosion layer extends to the left side of the vertical plane passing through the left edge of the upper surface of the top face waterproof steel plate, and the right end extends to the right side of the vertical plane passing through the right edge of the upper surface of the top face waterproof steel plate; the left surface of the left side face waterproof steel plate is provided with a left side face anti-corrosion layer, and the upper end of the left side face anti-corrosion layer extends above the horizontal plane passing through the upper edge of the left surface of the left side face waterproof steel plate; the right surface of the right side face waterproof steel plate is provided with a right side face anti-corrosion layer, and the upper end of the right side face anti-corrosion layer extends above the horizontal plane passing through the upper edge of the right surface of the right side face waterproof steel plate; the top face anti-corrosion layer is first prefabricated on the top face waterproof steel plate and then the top face waterproof steel plate is installed, the left side face anti-corrosion layer is first prefabricated on the left side face waterproof steel plate and then the left side face waterproof steel plate is installed, and the right side face anti-corrosion layer is first prefabricated on the right side face waterproof steel plate and then the right side face waterproof steel plate is installed. When the waterproof steel plate is installed, the top anti-corrosion layer will be deformed and extend to the left and right end faces of the top waterproof steel plate, the left side anti-corrosion layer will extend to the upper end face of the left side waterproof steel plate, and the right side anti-corrosion layer will extend to the upper end face of the right side waterproof steel plate, thereby preventing corrosion at the interface.

[0010] Preferably, the upper end of the right surface of the left side waterproof steel plate is provided with a left waterproof steel plate positioning flange overlapped with the left end of the lower surface of the top face waterproof steel plate, and the upper end of the left surface of the right side waterproof steel plate is provided with a right waterproof steel plate positioning flange overlapped with the right end of the lower surface of the top face waterproof steel plate. It is convenient to know whether the left and right side waterproof steel plates are installed in place.

[0011] Preferably, it also includes a left concrete fixing strip for fixing the lower end of the left side face waterproof steel plate and a right concrete fixing strip for fixing the lower end of the right side face waterproof steel plate; in step B, the left concrete fixing strip is cast at the left end of the ground of the inner hole to fix the lower end of the left side face waterproof steel plate to prevent the left side face waterproof steel plate from tipping over, and then the squeezing mechanism is released to support the left side face waterproof steel plate; the right concrete fixing strip is cast at the right end of the ground of the inner hole to fix the lower end of the right side face waterproof steel plate to prevent the right side face waterproof steel plate from tipping over, and then the squeezing mechanism is released to support the right side face waterproof steel plate; step C includes the following steps: C1, supporting the left template by the squeezing mechanism and the left side face decorative panel is supported on the left side of the left template so that an arc-shaped left side face segment cavity is formed between the left side face decorative panel and the left side face waterproof steel plate, supporting the right template and the right side face decorative panel is supported on the right side of the right template so that an arc-shaped right side face segment cavity is formed between the right side face decorative panel and the right side face waterproof steel plate C2, pouring concrete into the arc-shaped left side segment cavity, the upper end of the left side decorative panel is higher than the left end of the top face waterproof steel plate, and the upper end of the right side decorative panel is higher than the right end of the top face waterproof steel plate; C2, pouring concrete into the arc-shaped left side segment cavity, the upper end of the concrete in the arc-shaped left side segment cavity submerges the left end of the top face waterproof steel plate, the concrete in the arc-shaped left side segment cavity solidifies to form an arc-shaped left side segment that fixes the left end of the top face waterproof steel plate, pouring concrete into the arc-shaped right side segment cavity, the concrete in the arc-shaped right side segment cavity The upper end of the concrete submerges the right end of the top surface waterproof steel plate, and the concrete in the arc-shaped right side segment cavity solidifies to form an arc-shaped left side segment that fixes the right end of the top surface waterproof steel plate; C3, the extrusion mechanism loses its supporting effect on the top surface waterproof steel plate; C4, the upper template is supported by the extrusion mechanism, and the top surface decorative panel is supported on the upper side of the upper template, so that an arc-shaped top surface segment cavity is formed between the top surface decorative panel and the top surface waterproof steel plate, and concrete is poured into the arc-shaped top surface segment cavity to solidify into an arc-shaped top surface segment. In the process of releasing the support of the top surface waterproof steel plate by the extrusion mechanism to carry out the construction of the arc-shaped top surface segment, there is no need to build temporary support for support, which improves the convenience and speed of construction.

[0012] Preferably, the bottom wall of the inner hole is provided with a left groove and a right groove extending in the direction of the tunnel extension; the left groove is provided with a left concrete fixing strip extending in the direction of the left groove to fix the left side face waterproof steel plate, the lower end of the arc-shaped left side face section and the lower end of the left side face decorative panel are supported in the left groove, and the left end of the tunnel bottom wall is cast together with the left side face decorative panel; the right groove is provided with a right concrete fixing strip extending in the direction of the right groove to fix the right side face waterproof steel plate, the lower end of the arc-shaped right side face section and the lower end of the right side face decorative panel are supported in the right groove, and the right end of the tunnel bottom wall is cast together with the right side face decorative panel. The arc-shaped left and right side face waterproof steel plates are fixed so that the supporting effect of the extrusion mechanism can be released.

[0013] Preferably, a left flange extending to the bottom surface of the left groove is provided on the lower surface of the left end of the tunnel bottom wall, the left flange is cast together with the left side face decorative panel, and the left flange is integrally formed with the tunnel bottom wall; a right flange extending to the bottom surface of the right groove is provided on the lower surface of the right end of the tunnel bottom wall, the right flange is cast together with the right side face decorative panel, and the right flange is integrally formed with the tunnel bottom wall. This can improve the waterproof and anti-leakage effect.

[0014] Preferably, the extrusion mechanism includes a mobile support platform, a middle frame connected to the mobile support platform, a lifting cylinder connected to the mobile support platform, a right extrusion cylinder connected to the right side of the middle frame and telescopic to the right, and a left extrusion cylinder connected to the left side of the middle frame and telescopic to the left.

[0015] The invention has the following advantages: the produced tunnel has good anti-seepage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the waterproof steel plate just installed in the inner hole; Figure 2 for Figure 1 A local enlarged schematic diagram of point A; Figure 3 It is a schematic diagram of the left side face waterproof steel plate and the right side face waterproof steel plate installed into the inner hole and the top face waterproof steel plate installed in place; Figure 4 for Figure 3 A local enlarged schematic diagram of point B; Figure 5 for Figure 4 A local enlarged schematic diagram of point C; Figure 6 This is a schematic diagram of the left side face waterproof steel plate, the right side face waterproof steel plate and the top face waterproof steel plate being installed in place; Figure 7 for Figure 6A local enlarged schematic diagram of D; Figure 8 for Figure 7 A local enlarged schematic diagram of point E; Fig. 9 for Figure 8 A local enlarged schematic diagram of F; Fig.10 This is a schematic diagram of the arc-shaped left side segment and the arc-shaped right side segment after construction; Fig.11 It is a schematic diagram when the arc-shaped top surface segment, the arc-shaped left surface segment and the arc-shaped right surface segment are all constructed; Fig.12 This is a schematic diagram after the tunnel side walls and tunnel bottom walls are constructed.

[0017] In the figure: tunnel bottom wall 1, tunnel area 2, arc-shaped top surface segment 3, arc-shaped left side surface segment 4, arc-shaped right side surface segment 5, top surface waterproof steel plate 6, top surface decorative panel 7, top surface anti-corrosion layer 8, left side surface waterproof steel plate 9, left side surface decorative panel 10, left side surface anti-corrosion layer 11, right side surface waterproof steel plate 12, right side surface decorative panel 13, right side surface anti-corrosion layer 14, left inclined surface 15, right inclined surface 16, vertical plane 17 passing through the left edge of the upper surface of the top surface waterproof steel plate, passing through the upper end of the left surface of the left side surface waterproof steel plate Horizontal plane 18 of the edge, waterproof layer 19 on the left end surface of the top waterproof steel plate, waterproof layer 20 on the upper end surface of the left side waterproof steel plate, left waterproof steel plate positioning flange 21, right waterproof steel plate positioning flange 22, left groove 23, right groove 24, left concrete fixing strip 25, right concrete fixing strip 26, left flange 27, right flange 28, inner hole 29, outer contour 30 of the tunnel side wall, upper reinforcement frame 31, left reinforcement frame 32, right reinforcement frame 33, movable support platform 34, middle frame 35, lifting cylinder 36, right extrusion cylinder 37, left extrusion cylinder 38. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 12A circular tunnel construction method, wherein the tunnel is surrounded by a circular tunnel side wall and a tunnel bottom wall 1 of a planar structure, the tunnel side wall and the tunnel bottom wall are both concrete structures, the geology of the area 2 where the tunnel is located is soil, the tunnel side wall includes an arc-shaped top surface segment 3, an arc-shaped left side surface segment 4 whose upper end is connected to the left end of the arc-shaped top surface segment, and an arc-shaped right side surface segment 5 whose upper end is connected to the right end of the arc-shaped top surface segment, the upper surface of the arc-shaped top surface segment is cast with a top surface waterproof steel plate 6, and the lower surface is cast with a top surface decorative panel 7. A top surface anti-corrosion layer 8 is provided on the upper surface of the top surface waterproof steel plate. The top surface anti-corrosion layer is a non-degradable plastic structure. The top surface anti-corrosion layer is prefabricated on the top surface waterproof steel plate. A left surface waterproof steel plate 9 is cast on the left surface of the arc-shaped left side surface segment, and a left surface decorative panel 10 is cast on the right surface. A left surface anti-corrosion layer 11 is provided on the left surface of the left surface waterproof steel plate. The left surface of the left surface waterproof steel plate is provided with a left surface anti-corrosion layer. The left surface of the left surface anti-corrosion layer is a non-degradable plastic structure. The left side facial anti-corrosion layer is first prefabricated on the left side facial waterproof steel plate. The right surface of the arc-shaped right side segment is cast with the right side facial waterproof steel plate 12, and the left surface is cast with the right side facial decorative panel 13. The right surface of the right side facial waterproof steel plate is provided with a right side facial anti-corrosion layer 14, and the right side facial anti-corrosion layer is first prefabricated on the right side facial waterproof steel plate. The right side facial anti-corrosion layer is a non-degradable plastic structure. The upper end surface of the left side facial waterproof steel plate is supported on the left end surface of the top facial waterproof steel plate, and the upper end surface of the left side facial waterproof steel plate and the left end surface of the top facial waterproof steel plate are matched and abutted together through the left inclined surface 15, and the inner end of the outer end of the left inclined surface is higher; the upper end surface of the right side facial waterproof steel plate is supported on the right end surface of the top facial waterproof steel plate, and the upper end surface of the right side facial waterproof steel plate and the right end surface of the top facial waterproof steel plate are matched and abutted together through the right inclined surface 16, and the inner end of the outer end of the right inclined surface is higher. The left end of the top surface anti-corrosion layer extends to the left side of the vertical plane 17 passing through the left edge of the upper surface of the top surface waterproof steel plate, and the right end extends to the right side of the vertical plane passing through the right edge of the upper surface of the top surface waterproof steel plate; the upper end of the left side surface anti-corrosion layer extends to the upper side of the horizontal plane 18 passing through the upper edge of the left surface of the left side surface waterproof steel plate; the upper end of the right side surface anti-corrosion layer extends to the upper side of the horizontal plane passing through the upper edge of the right surface of the right side surface waterproof steel plate. When the waterproof steel plate is installed, the top surface anti-corrosion layer can be deformed and extend to the left end surface of the top surface waterproof steel plate waterproof layer 19 of the top surface waterproof steel plate, extend to the right end surface of the top surface waterproof steel plate waterproof layer, the left side surface anti-corrosion layer extends to the upper end surface of the left side surface waterproof steel plate to form the upper end surface waterproof layer of the left side surface waterproof steel plate 20, and the right side surface anti-corrosion layer extends to the upper end surface of the right side surface waterproof steel plate to form the upper end surface waterproof layer of the right side surface waterproof steel plate, which can prevent the interface from rotting. The upper end of the right surface of the left side face waterproof steel plate is provided with a left waterproof steel plate positioning flange 21 which overlaps the left end of the lower surface of the top face waterproof steel plate, and the upper end of the left surface of the right side face waterproof steel plate is provided with a right waterproof steel plate positioning flange 22 which overlaps the right end of the lower surface of the top face waterproof steel plate.A left groove 23 and a right groove 24 extending along the extension direction of the tunnel are provided on the bottom wall of the inner hole; a left concrete fixing strip 25 extending along the extension direction of the left groove is provided in the left groove to fix the left side surface waterproof steel plate, the lower end of the arc-shaped left side surface segment and the lower end of the left side surface decorative panel are supported in the left groove, and the left end of the bottom wall of the tunnel is cast together with the left side surface decorative panel; a right concrete fixing strip 26 extending along the extension direction of the right groove is provided in the right groove to fix the right side surface waterproof steel plate, the lower end of the arc-shaped right side surface segment and the lower end of the right side surface decorative panel are supported in the right groove, and the right end of the bottom wall of the tunnel is cast together with the right side surface decorative panel. A left flange 27 extending to the bottom surface of the left groove is provided on the lower surface of the left end of the tunnel bottom wall, and the left flange is cast together with the left side facial decorative panel, and the left flange is integrally formed with the tunnel bottom wall; a right flange 28 extending to the bottom surface of the right groove is provided on the lower surface of the right end of the tunnel bottom wall, and the right flange is cast together with the right side facial decorative panel, and the right flange is integrally formed with the tunnel bottom wall.

[0020] The process of constructing a circular tunnel is: A. Construction tunnel hollow: dig an inner hole 29 of a set length in the area of ​​the tunnel under construction. The inner hole is located inside the designed position of the outer contour 30 of the tunnel side wall. The distance between the circumference of the inner hole and the designed position of the outer contour of the tunnel side wall is more than ten centimeters. The top wall of the inner hole is an arc shape concentric with the outer contour of the tunnel side wall.

[0021] B. Construction of waterproof layer on tunnel side wall: align the top waterproof steel plate with the top wall of the inner hole, align the left waterproof steel plate with the left wall of the inner hole, and align the right waterproof steel plate with the right wall of the tunnel. Use the extrusion mechanism to squeeze the top waterproof steel plate upward so that the soil on the top wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall, squeeze the left waterproof steel plate to the left so that the soil on the left wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall, and squeeze the right waterproof steel plate to the right so that the soil on the right wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall; C. Building concrete layer and installing decorative panels: supporting the left formwork through an extrusion mechanism and supporting the left side face decorative panel on the left side of the left formwork so that an arc-shaped left side face section cavity is formed between the left side face decorative panel and the left side face waterproof steel plate; supporting the right formwork and supporting the right side face decorative panel on the right side of the right formwork so that an arc-shaped right side face section cavity is formed between the right side face decorative panel and the right side face waterproof steel plate; supporting the upper formwork and supporting the top face decorative panel on the upper side of the upper formwork so that an arc-shaped top face section cavity is formed between the top face decorative panel and the top face waterproof steel plate; pouring concrete into the arc-shaped left side face section cavity to solidify into an arc-shaped left side face section; pouring concrete into the arc-shaped right side face section cavity to solidify into an arc-shaped right side face section; and pouring concrete into the arc-shaped top face section cavity to solidify into an arc-shaped top face section.

[0022] In step B, the extrusion mechanism first squeezes the top surface waterproof steel plate upward so that the soil on the top wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall, and then squeezes the left side surface waterproof steel plate to the left so that the soil on the left side wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall, and squeezes the right side surface waterproof steel plate to the right so that the soil on the right side wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall.

[0023] It also includes an upper reinforcing frame 31 supported on the lower surface of the top face waterproof steel plate, a left reinforcing frame 32 supported on the right surface of the left face waterproof steel plate, and a right reinforcing frame 33 supported on the left surface of the right face waterproof steel plate. The left and right ends of the top face waterproof steel plate both extend beyond the upper reinforcing frame, the upper end of the left reinforcing frame is located above the upper end of the left face waterproof steel plate, and the upper end of the right reinforcing frame is located above the upper end of the right face waterproof steel plate. In step B, the extrusion mechanism removes the top face waterproof steel plate through the upper reinforcing frame, removes the left face waterproof steel plate through the left reinforcing frame, and removes the right face waterproof steel plate through the right reinforcing frame.

[0024] In step B, a left concrete fixing strip is cast at the left end of the ground of the inner hole to fix the lower end of the left face waterproof steel plate to prevent the left face waterproof steel plate from tipping over, and then the squeezing mechanism is released to support the left face waterproof steel plate; a right concrete fixing strip is cast at the right end of the ground of the inner hole to fix the lower end of the right face waterproof steel plate to prevent the right face waterproof steel plate from tipping over, and then the squeezing mechanism is released to support the right face waterproof steel plate; Step C includes the following steps: C1, supporting the left template by the extrusion mechanism and supporting the left side face decoration panel on the left side of the left template so that an arc-shaped left side face segment cavity is formed between the left side face decoration panel and the left side face waterproof steel plate, supporting the right template and supporting the right side face decoration panel on the right side of the right template so that an arc-shaped right side face segment cavity is formed between the right side face decoration panel and the right side face waterproof steel plate, the upper end of the left side face decoration panel is higher than the left end of the top face waterproof steel plate, and the upper end of the right side face decoration panel is higher than the right end of the top face waterproof steel plate; C2, pouring concrete into the arc-shaped left side face segment cavity, and the upper end of the concrete in the arc-shaped left side face segment cavity submerges the left end of the top face waterproof steel plate , the concrete in the arc-shaped left side segment cavity solidifies to form an arc-shaped left side segment that fixes the left end of the top face waterproof steel plate, and concrete is poured into the arc-shaped right side segment cavity. The upper end of the concrete in the arc-shaped right side segment cavity submerges the right end of the top face waterproof steel plate, and the concrete in the arc-shaped right side segment cavity solidifies to form an arc-shaped left side segment that fixes the right end of the top face waterproof steel plate; C3, the extrusion mechanism loses its supporting effect on the top face waterproof steel plate; C4, the upper formwork is supported by the extrusion mechanism and the top face decorative panel is supported on the upper side of the upper formwork so that an arc-shaped top face segment cavity is formed between the top face decorative panel and the top face waterproof steel plate, and concrete is poured into the arc-shaped top face segment cavity to solidify into an arc-shaped top face segment.

[0025] The extrusion mechanism includes a movable support platform 34, a middle frame 35 connected to the movable support platform, a lifting cylinder 36 connected to the movable support platform, a right extrusion cylinder 37 connected to the right side of the middle frame and extending toward the right, and a left extrusion cylinder 38 connected to the left side of the middle frame and extending toward the left.

Claims

1. A circular tunnel construction method, wherein the tunnel is surrounded by a circular tunnel side wall and a tunnel bottom wall of a planar structure, the tunnel side wall and the tunnel bottom wall are both concrete structures, the geology of the area where the tunnel is located is soil, the tunnel side wall comprises an arc-shaped top surface segment, an arc-shaped left side surface segment whose upper end is connected to the left end of the arc-shaped top surface segment, and an arc-shaped right side surface segment whose upper end is connected to the right end of the arc-shaped top surface segment, the upper surface of the arc-shaped top surface segment is cast with a top surface waterproof steel plate, and the lower surface is cast with a top surface decorative panel, the left surface of the arc-shaped left side surface segment is cast with a left side surface waterproof steel plate, and the right surface is cast with a left side surface decorative panel. Side decorative panel, the right surface of the arc-shaped right side segment is cast with a right side waterproof steel plate, and the left surface is cast with a right side decorative panel; the process of constructing a circular tunnel is as follows: A. Building tunnel interior: dig an inner hole of a set length in the area of ​​the tunnel under construction, the inner hole is located inside the design position of the outer contour of the tunnel side wall, and the distance between the circumference of the inner hole and the design position of the outer contour of the tunnel side wall is more than ten centimeters; B. Construction of tunnel side wall waterproof layer: align the top face waterproof steel plate with the top wall of the inner hole, align the left side face waterproof steel plate with the left wall of the inner hole, and align the right side face waterproof steel plate with the tunnel On the right side wall of the tunnel, the top waterproof steel plate is squeezed upward by the squeezing mechanism so that the soil on the top wall of the inner hole is compressed to the design position of the outer contour of the tunnel side wall, the left side waterproof steel plate is squeezed to the left so that the soil on the left side wall of the inner hole is compressed to the design position of the outer contour of the tunnel side wall, and the right side waterproof steel plate is squeezed to the right so that the soil on the right side wall of the inner hole is compressed to the design position of the outer contour of the tunnel side wall; C. Building concrete layer and installing decorative panels: The left template is supported by the squeezing mechanism and the left side decorative panel is supported on the left side of the left template so that the left side decorative panel and the left side waterproof steel plate An arc-shaped left side segment cavity is formed between the right template and the right side decorative panel is supported on the right side of the right template, so that an arc-shaped right side segment cavity is formed between the right side decorative panel and the right side waterproof steel plate, and the upper template is supported and the top face decorative panel is supported on the upper side of the upper template, so that an arc-shaped top face segment cavity is formed between the top face decorative panel and the top face waterproof steel plate, concrete is poured into the arc-shaped left side segment cavity and solidified into an arc-shaped left side segment, poured into the arc-shaped right side segment cavity and solidified into an arc-shaped right side segment, and poured into the arc-shaped top face segment cavity and solidified into an arc-shaped top face segment.

2. A circular tunnel construction method according to claim 1, characterized in that: The upper end surface of the left side waterproof steel plate is supported on the left end surface of the top face waterproof steel plate, the upper end surface of the left side waterproof steel plate and the left end surface of the top face waterproof steel plate are butted together by a left inclined surface, and the inner end of the outer end of the left inclined surface is higher; the upper end surface of the right side waterproof steel plate is supported on the right end surface of the top face waterproof steel plate, the upper end surface of the right side waterproof steel plate and the right end surface of the top face waterproof steel plate are butted together by a right inclined surface, and the inner end of the outer end of the right inclined surface is higher; in step B, the extrusion mechanism first extrudes the top face waterproof steel plate upward so that the soil of the top wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall, and then extrudes the left side waterproof steel plate to the left so that the soil of the left side wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall, and extrudes the right side waterproof steel plate to the right so that the soil of the right side wall of the inner hole is compressed to the designed position of the outer contour of the tunnel side wall.

3. A circular tunnel construction method according to claim 2, characterized in that: It also includes an upper reinforcing frame supported on the lower surface of the top face waterproof steel plate, a left reinforcing frame supported on the right surface of the left face waterproof steel plate, and a right reinforcing frame supported on the left surface of the right face waterproof steel plate. The left and right ends of the top face waterproof steel plate both extend beyond the upper reinforcing frame, the upper end of the left reinforcing frame is located above the upper end of the left face waterproof steel plate, and the upper end of the right reinforcing frame is located above the upper end of the right face waterproof steel plate. In step B, the extrusion mechanism removes the top face waterproof steel plate through the upper reinforcing frame, removes the left face waterproof steel plate through the left reinforcing frame, and removes the right face waterproof steel plate through the right reinforcing frame.

4. A circular tunnel construction method according to claim 3, characterized in that: The top wall of the inner hole is in the shape of an arc concentric with the outer contour of the tunnel side wall.

5. A circular tunnel construction method according to claim 2, 3 or 4, characterized in that: The upper surface of the top surface waterproof steel plate is provided with a top surface anti-corrosion layer, the left end of the top surface anti-corrosion layer extends to the left side of the vertical plane passing through the left edge of the upper surface of the top surface waterproof steel plate, and the right end extends to the right side of the vertical plane passing through the right edge of the upper surface of the top surface waterproof steel plate; the left surface of the left side surface waterproof steel plate is provided with a left side surface anti-corrosion layer, the upper end of the left side surface anti-corrosion layer extends above the horizontal plane passing through the upper end edge of the left surface of the left side surface waterproof steel plate; the right surface of the right side surface waterproof steel plate is provided with a right side surface anti-corrosion layer, the upper end of the right side surface anti-corrosion layer extends above the horizontal plane passing through the upper end edge of the right surface of the right side surface waterproof steel plate; the top surface anti-corrosion layer is first prefabricated on the top surface waterproof steel plate and then the top surface waterproof steel plate is installed, the left side surface anti-corrosion layer is first prefabricated on the left side surface waterproof steel plate and then the left side surface waterproof steel plate is installed, and the right side surface anti-corrosion layer is first prefabricated on the right side surface waterproof steel plate and then the right side surface waterproof steel plate is installed.

6. A circular tunnel construction method according to claim 2, 3 or 4, characterized in that: The upper end of the right surface of the left side face waterproof steel plate is provided with a left waterproof steel plate positioning flange overlapping the left end of the lower surface of the top face waterproof steel plate, and the upper end of the left surface of the right side face waterproof steel plate is provided with a right waterproof steel plate positioning flange overlapping the right end of the lower surface of the top face waterproof steel plate.

7. A circular tunnel construction method according to claim 2, 3 or 4, characterized in that: It also includes a left concrete fixing strip for fixing the lower end of the left side face waterproof steel plate and a right concrete fixing strip for fixing the lower end of the right side face waterproof steel plate; in step B, the left concrete fixing strip is cast at the left end of the ground of the inner hole to fix the lower end of the left side face waterproof steel plate to prevent the left side face waterproof steel plate from tipping over, and then the squeezing mechanism is released to support the left side face waterproof steel plate; the right concrete fixing strip is cast at the right end of the ground of the inner hole to fix the lower end of the right side face waterproof steel plate to prevent the right side face waterproof steel plate from tipping over, and then the squeezing mechanism is released to support the right side face waterproof steel plate; step C includes the following steps: C1. The left template is supported by the extrusion mechanism, and the left side face decoration panel is supported on the left side of the left template so that an arc-shaped left side face segment cavity is formed between the left side face decoration panel and the left side face waterproof steel plate; the right template is supported and the right side face decoration panel is supported on the right side of the right template so that an arc-shaped right side face segment cavity is formed between the right side face decoration panel and the right side face waterproof steel plate, the upper end of the left side face decoration panel is higher than the left end of the top face waterproof steel plate, and the upper end of the right side face decoration panel is higher than the right end of the top face waterproof steel plate; C2. Concrete is poured into the arc-shaped left side face segment cavity, the upper end of the concrete in the arc-shaped left side face segment cavity submerges the left end of the top face waterproof steel plate, and the arc-shaped left The concrete in the side section cavity solidifies to form an arc-shaped left side section that fixes the left end of the top surface waterproof steel plate, and concrete is poured into the arc-shaped right side section cavity. The upper end of the concrete in the arc-shaped right side section cavity submerges the right end of the top surface waterproof steel plate, and the concrete in the arc-shaped right side section cavity solidifies to form an arc-shaped left side section that fixes the right end of the top surface waterproof steel plate; C3, the extrusion mechanism loses its supporting effect on the top surface waterproof steel plate; C4, the upper formwork is supported by the extrusion mechanism and the top surface decorative panel is supported on the upper side of the upper formwork so that an arc-shaped top surface section cavity is formed between the top surface decorative panel and the top surface waterproof steel plate, and concrete is poured into the arc-shaped top surface section cavity and solidified into an arc-shaped top surface section.

8. A tunnel side wall construction method according to claim 2, 3 or 4, characterized in that: The bottom wall of the inner hole is provided with a left groove and a right groove extending in the direction of the tunnel extension; the left groove is provided with a left concrete fixing strip extending in the direction of the left groove to fix the left side face waterproof steel plate, the lower end of the arc-shaped left side face section and the lower end of the left side face decorative panel are supported in the left groove, and the left end of the tunnel bottom wall is cast together with the left side face decorative panel; the right groove is provided with a right concrete fixing strip extending in the direction of the right groove to fix the right side face waterproof steel plate, the lower end of the arc-shaped right side face section and the lower end of the right side face decorative panel are supported in the right groove, and the right end of the tunnel bottom wall is cast together with the right side face decorative panel. The arc-shaped left and right side face waterproof steel plates are fixed so that the supporting effect of the extrusion mechanism can be released.

9. A circular tunnel construction method according to claim 8, characterized in that: A left flange extending to the bottom surface of the left groove is provided on the lower surface of the left end of the tunnel bottom wall, and the left flange is cast together with the left side facial decorative panel, and the left flange is integrally formed with the tunnel bottom wall; a right flange extending to the bottom surface of the right groove is provided on the lower surface of the right end of the tunnel bottom wall, and the right flange is cast together with the right side facial decorative panel, and the right flange is integrally formed with the tunnel bottom wall.

10. A tunnel side wall construction method according to claim 1 or 2 or 3 or 4, characterized in that: The extrusion mechanism comprises a movable support platform, a middle frame connected to the movable support platform, a lifting cylinder connected to the movable support platform, a right extrusion cylinder connected to the right side of the middle frame and telescopic to the right, and a left extrusion cylinder connected to the left side of the middle frame and telescopic to the left.

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