A method for circular tunnel construction

Abstract

The present application relates to a kind of circular tunnel construction methods, the process of constructing circular tunnel is as follows: A, building tunnel inner space;B, tunnel side wall waterproof layer construction;C, building concrete layer and installing decorative panel.The present application aims to provide a kind of circular tunnel construction method with good anti-seepage effect, solves the problem that tunnel is easy to produce penetration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a circular tunnel construction method. BACKGROUND

[0002] In the process of road traffic construction, tunnels are often built. There are several methods for tunnel construction, including:

[0003] Full-face excavation method, which is a construction method of blasting and forming according to the design contour, and then building a lining;

[0004] Step method construction, which is a construction method of excavating the upper half of the section first, and then excavating the lower half of the section after a certain length, and the upper and lower halves of the section are excavated simultaneously and advanced;

[0005] Annular excavation with core soil method;

[0006] Mid-partition wall method, which is a construction method of excavating one side of the tunnel first and then excavating the other side by building a mid-partition wall, mainly applied to double-line tunnel IV-grade surrounding rock deep buried hard rock sections and old loess tunnel sections;

[0007] Cross mid-partition wall method, which is a construction method of excavating one or two parts of one side of the tunnel first, building partial mid-partition walls and cross partitions, and then excavating one or two parts of the other side of the tunnel.

[0008] Full-face excavation method is to excavate an inner hole with a size meeting the requirements in the area where the tunnel is built, and build a tunnel wall in the inner hole for support to prevent tunnel collapse. When the geology of the area where the tunnel is located is soil, it is easy to cause seepage and water leakage. SUMMARY

[0009] The present application aims to provide a circular tunnel construction method with good anti-seepage effect, solving the problem of easy seepage of tunnels.

[0010] The above technical problem is solved by the following technical scheme: a circular tunnel construction method, the tunnel is surrounded by a circular tunnel side wall and a tunnel bottom wall with a plane structure, the tunnel side wall and the tunnel bottom wall are both concrete structures, the geological condition of the area where the tunnel is located is soil, the tunnel side wall comprises an arc-shaped top surface section, an arc-shaped left side surface section with an upper end connected to the left end of the arc-shaped top surface section, and an arc-shaped right side surface section with an upper end connected to the right end of the arc-shaped top surface section, a top surface of the arc-shaped top surface section is cast with a top surface waterproof steel plate, and a lower surface is cast with a top surface decorative panel, a left surface of the arc-shaped left side surface section is cast with a left side surface waterproof steel plate, and a right surface is cast with a left side surface decorative panel, a right surface of the arc-shaped right side surface section is cast with a right side surface waterproof steel plate, and a left surface is cast with a right side surface decorative panel; the process of constructing the circular tunnel comprises the following steps: A, building a tunnel inner cavity: excavating an inner hole with a set length in the area of the tunnel being built, the inner hole is located inside the outer contour design position of the tunnel side wall, and the distance between the peripheral surface of the inner hole and the outer contour design position of the tunnel side wall is more than 10 cm; B, tunnel side wall waterproof layer construction: aligning the top surface waterproof steel plate with the inner hole top wall, the left side surface waterproof steel plate with the inner hole left side wall, and the right side surface waterproof steel plate with the tunnel right side wall, and extruding the top surface waterproof steel plate upwards by an extruding mechanism to compress the soil of the inner hole top wall to the outer contour design position of the tunnel side wall, extruding the left side surface waterproof steel plate to the left to compress the soil of the inner hole left side wall to the outer contour design position of the tunnel side wall, and extruding the right side surface waterproof steel plate to the right to compress the soil of the inner hole right side wall to the outer contour design position of the tunnel side wall; C, building a concrete layer and installing a decorative panel: supporting the left formwork by the extruding mechanism, and supporting the left side surface decorative panel on the left side of the left formwork to form an arc-shaped left side surface section cavity between the left side surface decorative panel and the left side surface waterproof steel plate, supporting the right formwork, and supporting the right side surface decorative panel on the right side of the right formwork to form an arc-shaped right side surface section cavity between the right side surface decorative panel and the right side surface waterproof steel plate, and supporting the upper formwork, and supporting the top surface decorative panel on the upper side of the upper formwork to form an arc-shaped top surface section cavity between the top surface decorative panel and the top surface waterproof steel plate, pouring concrete into the arc-shaped left side surface section cavity to solidify into an arc-shaped left side surface section, pouring into the arc-shaped right side surface section cavity to solidify into an arc-shaped right side surface section, and pouring into the arc-shaped top surface section cavity to solidify into an arc-shaped top surface section. The tunnel side wall peripheral soil is compacted, which can effectively prevent water from seeping 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, and the compacting and installation of the waterproof layer are completed in one step; the decorative panel is cast together with the tunnel side wall, which not only does not need to be installed by punching to reduce the strength of the tunnel side wall, but also is firmly and reliably connected, and can also serve as a demolding layer for mold demolding, so that plastic film or release agent is not needed for demolding during pouring.

[0011] As preferred, the upper end surface of the left side waterproof steel plate is supported on the left end surface of the top surface waterproof steel plate, the upper end surface of the left side waterproof steel plate and the left end surface of the top surface waterproof steel plate are abutted together through left inclined surface cooperation, the left inclined surface is higher from the outer end to the inner end; the upper end surface of the right side waterproof steel plate is supported on the right end surface of the top surface waterproof steel plate, the upper end surface of the right side waterproof steel plate and the right end surface of the top surface waterproof steel plate are abutted together through right inclined surface cooperation, the right inclined surface is higher from the outer end to the inner end; in the step B, the extruding mechanism first extrudes the top surface waterproof steel plate upwards so that the soil of the inner hole top wall is compressed to the tunnel side wall outer contour design position, then extrudes the left side waterproof steel plate to the left so that the soil of the inner hole left side wall is compressed to the tunnel side wall outer contour design position and extrudes the right side waterproof steel plate to the right so that the soil of the inner hole right side wall is compressed to the tunnel side wall outer contour design position. The butt joint of the waterproof steel plate can be prevented from leaking.

[0012] As preferred, it further comprises an upper reinforcing frame supported on the lower surface of the top surface waterproof steel plate, a left reinforcing frame supported on the right surface of the left side waterproof steel plate and a right reinforcing frame supported on the left surface of the right side waterproof steel plate, the left and right ends of the top surface waterproof steel plate both exceed the upper reinforcing frame, the upper end of the left reinforcing frame is above the upper end of the left side waterproof steel plate, the upper end of the right reinforcing frame is above the upper end of the right side waterproof steel plate; in the step B, the extruding mechanism extrudes the top surface waterproof steel plate through the upper reinforcing frame, extrudes the left side waterproof steel plate through the left reinforcing frame and extrudes the right side waterproof steel plate through the right reinforcing frame. The left and right ends of the top surface waterproof steel plate can be deformed downwards in the extruding process, the upper ends of the left and right side waterproof steel plates are not deformed, the left side waterproof steel plate corrects the two ends of the top surface waterproof steel plate when in place, so that the cooperation at the interface is more compact, thereby improving the waterproof effect.

[0013] As preferred, the top wall of the inner hole is a circular arc shape concentric with the tunnel side wall outer contour. When the top surface waterproof steel plate enters the inner hole and extrudes the soil, the thickness of the soil extruded by the two ends of the top surface waterproof steel plate is thick, so that the stress of the two sections of the top surface waterproof steel plate is large when extruded, and the large stress can ensure that the two ends of the top surface waterproof steel plate are deformed by bending.

[0014] As preferred, the upper surface of the top surface waterproof steel plate is provided with a top surface anticorrosion layer, the left end of the top surface anticorrosion 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 of the top surface anticorrosion layer 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 anticorrosion layer, the upper end of the left side surface anticorrosion 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 anticorrosion layer, the upper end of the right side surface anticorrosion 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 anticorrosion layer is prefabricated on the top surface waterproof steel plate, and then the top surface waterproof steel plate is installed, the left side surface anticorrosion layer is 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 anticorrosion layer is prefabricated on the right side surface waterproof steel plate, and then the right side surface waterproof steel plate is installed. The top surface anticorrosion layer can be deformed and extended to the left and right end surfaces of the top surface waterproof steel plate when the waterproof steel plate is installed, the left side surface anticorrosion layer is extended to the upper end surface of the left side surface waterproof steel plate, and the right side surface anticorrosion layer is extended to the upper end surface of the right side surface waterproof steel plate, thereby preventing decay at the interface.

[0015] As preferred, the upper end of the right surface of the left side surface waterproof steel plate is provided with a left waterproof steel plate positioning flange lapping to the left end of the lower surface of the top surface waterproof steel plate, and the upper end of the left surface of the right side surface waterproof steel plate is provided with a right waterproof steel plate positioning flange lapping to the right end of the lower surface of the top surface waterproof steel plate. Whether the left and right side surface waterproof steel plates are installed in place can be easily known.

[0016] As preferred, the left concrete fixing strip for fixing the lower end of the left side waterproof steel plate and the right concrete fixing strip for fixing the lower end of the right side waterproof steel plate are further included; in the B step, the left concrete fixing strip is poured at the left end of the ground of the inner hole to fix the lower end of the left side waterproof steel plate to prevent the left side waterproof steel plate from tilting, and then the supporting effect of the extrusion mechanism on the left side waterproof steel plate is released; the right concrete fixing strip is poured at the right end of the ground of the inner hole to fix the lower end of the right side waterproof steel plate to prevent the right side waterproof steel plate from tilting, and then the supporting effect of the extrusion mechanism on the right side waterproof steel plate is released; the C step includes the following steps: C1, supporting the left formwork by the extrusion mechanism and supporting the left side decorative panel on the left side of the left formwork to form the arc-shaped left side segment cavity between the left side decorative panel and the left side waterproof steel plate, and supporting the right formwork and supporting the right side decorative panel on the right side of the right formwork to form the arc-shaped right side segment cavity between the right side decorative panel and the right side waterproof steel plate, the upper end of the left side decorative panel being higher than the left end of the top waterproof steel plate, and the upper end of the right side decorative panel being higher than the right end of the top 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 submerging the left end of the top waterproof steel plate, and the concrete in the arc-shaped left side segment cavity solidifying to form the arc-shaped left side segment for fixing the left end of the top waterproof steel plate, and pouring concrete into the arc-shaped right side segment cavity, the upper end of the concrete in the arc-shaped right side segment cavity submerging the right end of the top waterproof steel plate, and the concrete in the arc-shaped right side segment cavity solidifying to form the arc-shaped left side segment for fixing the right end of the top waterproof steel plate; C3, releasing the supporting effect of the extrusion mechanism on the top waterproof steel plate; C4, supporting the upper formwork by the extrusion mechanism and supporting the top decorative panel on the upper side of the upper formwork to form the arc-shaped top segment cavity between the top decorative panel and the top waterproof steel plate, and pouring concrete into the arc-shaped top segment cavity to solidify into the arc-shaped top segment. In the process of releasing the supporting effect of the extrusion mechanism on the top waterproof steel plate to facilitate the construction of the arc-shaped top segment, no temporary support needs to be built to support, thereby improving the convenience and speed during construction.

[0017] As preferred, the bottom wall of the inner hole is provided with a left groove and a right groove extending along the extending direction of the tunnel; the left groove is provided with a left concrete fixing strip extending along the extending direction of the left groove for fixing the left side waterproof steel plate, the lower end of the arc-shaped left side section and the lower end of the left side decorative panel are supported in the left groove, and the left end of the tunnel bottom wall is casted together with the left side decorative panel; the right groove is provided with a right concrete fixing strip extending along the extending direction of the right groove for fixing the right side waterproof steel plate, the lower end of the arc-shaped right side section and the lower end of the right side decorative panel are supported in the right groove, and the right end of the tunnel bottom wall is casted together with the right side decorative panel. The arc-shaped left and right side waterproof steel plates are fixed, so that the support of the extrusion mechanism can be removed.

[0018] As preferred, the lower surface of the left end of the tunnel bottom wall is provided with a left flange extending to the bottom surface of the left groove, the left flange is casted together with the left side decorative panel, and the left flange is integrally formed with the tunnel bottom wall; the lower surface of the right end of the tunnel bottom wall is provided with a right flange extending to the bottom surface of the right groove, the right flange is casted together with the right side decorative panel, and the right flange is integrally formed with the tunnel bottom wall. The waterproof and anti-leakage effect can be improved.

[0019] As preferred, the extrusion mechanism comprises a moving support table, a middle frame connected to the moving support table, a jacking oil cylinder connected to the moving support table, a right extrusion oil cylinder connected to the right side of the middle frame and extending rightwards, and a left extrusion oil cylinder connected to the left side of the middle frame and extending leftwards.

[0020] The present application has the following advantages: the made tunnel has good anti-seepage effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A schematic view when the waterproof steel plate is just installed into the inner hole;

[0022] Figure 2 A schematic view when the waterproof steel plate is just installed into the inner hole; Figure 1 A partial enlarged view of A of FIG. 1;

[0023] Figure 3 A schematic view when the left side waterproof steel plate and the right side waterproof steel plate are installed into the inner hole and the top side waterproof steel plate is installed in place;

[0024] Figure 4 A partial enlarged view of B of FIG. 1; Figure 3 A partial enlarged view of B of FIG. 1;

[0025] Figure 5 A partial enlarged view of C of FIG. 1; Figure 4 A partial enlarged view of C of FIG. 1;

[0026] Figure 6Fig. 6 is a schematic view of the tunnel when the left side waterproof steel plate, the right side waterproof steel plate and the top side waterproof steel plate are all installed in place;

[0027] Figure 7 Fig. 7 is a schematic view of the tunnel when the left side waterproof steel plate, the right side waterproof steel plate and the top side waterproof steel plate are all installed in place; Figure 6 Fig. 8 is a partial enlarged schematic view of D of Fig. 7;

[0028] Figure 8 Fig. 9 is a partial enlarged schematic view of E of Fig. 7; Figure 7 Fig. 10 is a partial enlarged schematic view of F of Fig. 7;

[0029] Figure 9 Fig. 11 is a partial enlarged schematic view of G of Fig. 7; Figure 8 Fig. 12 is a partial enlarged schematic view of H of Fig. 7;

[0030] Figure 10 Fig. 13 is a schematic view of the tunnel when the arc-shaped left side segment and the arc-shaped right side segment are constructed;

[0031] Figure 11 Fig. 14 is a schematic view of the tunnel when the arc-shaped top side segment, the arc-shaped left side segment and the arc-shaped right side segment are all constructed;

[0032] Figure 12 Fig. 15 is a schematic view of the tunnel when the tunnel side wall and the tunnel bottom wall are both constructed.

[0033] In the figure: tunnel bottom wall 1, tunnel area 2, arc-shaped top side segment 3, arc-shaped left side segment 4, arc-shaped right side segment 5, top side waterproof steel plate 6, top side decorative panel 7, top side corrosion-proof layer 8, left side waterproof steel plate 9, left side decorative panel 10, left side corrosion-proof layer 11, right side waterproof steel plate 12, right side decorative panel 13, right side corrosion-proof layer 14, left inclined surface 15, right inclined surface 16, vertical plane 17 passing through the upper edge of the left side of the top side waterproof steel plate, horizontal plane 18 passing through the upper end edge of the left side of the left side waterproof steel plate, left end waterproof layer of the top side waterproof steel plate 19, upper end waterproof layer of the left side waterproof steel plate 20, 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, tunnel side wall outer contour 30, upper reinforcing frame 31, left reinforcing frame 32, right reinforcing frame 33, mobile support platform 34, middle frame 35, jacking oil cylinder 36, right extrusion oil cylinder 37, left extrusion oil cylinder 38. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] See Figures 1 to 12The application relates to a circular tunnel construction method, wherein the tunnel is surrounded by a circular tunnel side wall and a tunnel bottom wall 1 with a plane structure, the tunnel side wall and the tunnel bottom wall are both concrete structures, the geological condition of a tunnel area 2 is soil, the tunnel side wall comprises an arc-shaped top surface section 3, an arc-shaped left side surface section 4 connected to the left end of the arc-shaped top surface section at the upper end and an arc-shaped right side surface section 5 connected to the right end of the arc-shaped top surface section at the upper end, the upper surface of the arc-shaped top surface section is cast with a top surface waterproof steel plate 6 and the lower surface is cast with a top surface decorative panel 7. The upper surface of the top surface waterproof steel plate is provided with a top surface anticorrosive layer 8. The top surface anticorrosive layer is a non-degradable plastic structure. The top surface anticorrosive layer is prefabricated on the top surface waterproof steel plate. The left surface of the arc-shaped left side surface section is cast with a left side surface waterproof steel plate 9 and the right surface is cast with a left side surface decorative panel 10. The left surface of the left side surface waterproof steel plate is provided with a left side surface anticorrosive layer 11. The left side surface anticorrosive layer is a non-degradable plastic structure. The left side surface anticorrosive layer is prefabricated on the left side surface waterproof steel plate. The right surface of the arc-shaped right side surface section is cast with a right side surface waterproof steel plate 12 and the left surface is cast with a right side surface decorative panel 13. The right surface of the right side surface waterproof steel plate is provided with a right side surface anticorrosive layer 14, and the right side surface anticorrosive layer is prefabricated on the right side surface waterproof steel plate. The right side surface anticorrosive layer is a non-degradable plastic structure. The upper end surface of the left side surface waterproof steel plate is supported on the left end surface of the top surface waterproof steel plate, the upper end surface of the left side surface waterproof steel plate and the left end surface of the top surface waterproof steel plate are abutted together through a left inclined surface 15, the outer end of the left inclined surface is higher than the inner end; the upper end surface of the right side surface waterproof steel plate is supported on the right end surface of the top surface waterproof steel plate, the upper end surface of the right side surface waterproof steel plate and the right end surface of the top surface waterproof steel plate are abutted together through a right inclined surface 16, and the outer end of the right inclined surface is higher than the inner end. The left end of the top surface anticorrosive layer extends to the left side of a 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 a 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 anticorrosive layer extends above a horizontal plane 18 passing through the upper end edge of the left surface of the left side surface waterproof steel plate; the upper end of the right side surface anticorrosive layer extends above a horizontal plane passing through the upper end edge of the right surface of the right side surface waterproof steel plate. The top surface anticorrosive layer can be deformed and extended to a left end surface waterproof layer 19 of the left end surface of the top surface waterproof steel plate, a right end surface waterproof layer of the right end surface of the top surface waterproof steel plate, a left side surface waterproof steel plate upper end surface waterproof layer 20 formed by extending the left side surface anticorrosive layer to the upper end surface of the left side surface waterproof steel plate and a right side surface waterproof steel plate upper end surface waterproof layer formed by extending the right side surface anticorrosive layer to the upper end surface of the right side surface waterproof steel plate, so as to prevent corrosion at the joint. The left end of the left side surface waterproof steel plate right surface upper end is provided with a left waterproof steel plate positioning flange 21 lapping to the left end of the lower surface of the top surface waterproof steel plate, and the left end of the right side surface waterproof steel plate left surface upper end is provided with a right waterproof steel plate positioning flange 22 lapping to the right end of the lower surface of the top surface waterproof steel plate.The bottom wall of the inner hole is provided with a left groove 23 and a right groove 24 extending along the extension direction of the tunnel; the left groove is provided with a left concrete fixing strip 25 extending along the extension direction of the left groove for fixing the left side waterproof steel plate, the lower end of the arc-shaped left side section and the lower end of the left side decorative panel are supported in the left groove, and the left end of the tunnel bottom wall is poured together with the left side decorative panel; the right groove is provided with a right concrete fixing strip 26 extending along the extension direction of the right groove for fixing the right side waterproof steel plate, the lower end of the arc-shaped right side section and the lower end of the right side decorative panel are supported in the right groove, and the right end of the tunnel bottom wall is poured together with the right side decorative panel. The lower surface of the left end of the tunnel bottom wall is provided with a left flange 27 extending to the bottom surface of the left groove, the left flange is poured together with the left side decorative panel, and the left flange is integrally formed with the tunnel bottom wall; the lower surface of the right end of the tunnel bottom wall is provided with a right flange 28 extending to the bottom surface of the right groove, the right flange is poured together with the right side decorative panel, and the right flange is integrally formed with the tunnel bottom wall.

[0036] The process of constructing a circular tunnel is as follows:

[0037] A, build a tunnel: a section of inner hole 29 with a set length is dug out in the area of the tunnel being built, the inner hole is located inside the design position of the tunnel side wall outer contour 30, the distance between the peripheral surface of the inner hole and the design position of the tunnel side wall outer contour is more than ten centimeters. The top wall of the inner hole is a circular arc shape concentric with the tunnel side wall outer contour.

[0038] B, construction of the tunnel side wall waterproof layer: align the top side waterproof steel plate with the top wall of the inner hole, the left side waterproof steel plate with the left side wall of the inner hole, and the right side waterproof steel plate with the right side wall of the tunnel, and use the extrusion mechanism to extrude the top side waterproof steel plate upwards so that the soil of the top wall of the inner hole is compressed to the design position of the tunnel side wall outer contour, extrude 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 design position of the tunnel side wall outer contour, and extrude 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 design position of the tunnel side wall outer contour;

[0039] C, construction of the concrete layer and installation of the decorative panel: support the left formwork with the left side decorative panel supported on the left side of the left formwork so as to form an arc-shaped left side section cavity between the left side decorative panel and the left side waterproof steel plate, support the right formwork with the right side decorative panel supported on the right side of the right formwork so as to form an arc-shaped right side section cavity between the right side decorative panel and the right side waterproof steel plate, and support the upper formwork with the top side decorative panel supported on the upper side of the upper formwork so as to form an arc-shaped top side section cavity between the top side decorative panel and the top side waterproof steel plate, pour concrete into the arc-shaped left side section cavity to solidify into an arc-shaped left side section, pour into the arc-shaped right side section cavity to solidify into an arc-shaped right side section, and pour into the arc-shaped top side section cavity to solidify into an arc-shaped top side section.

[0040] In the B step, the pressing mechanism first presses the top surface waterproof steel plate upward so that the soil of the inner hole top wall is compressed to the tunnel side wall outer contour design position, then presses the left side surface waterproof steel plate to the left so that the soil of the inner hole left side wall is compressed to the tunnel side wall outer contour design position, and presses the right side surface waterproof steel plate to the right so that the soil of the inner hole right side wall is compressed to the tunnel side wall outer contour design position.

[0041] It also includes an upper reinforcing frame 31 supported on the lower surface of the top surface waterproof steel plate, a left reinforcing frame 32 supported on the right surface of the left side surface waterproof steel plate, and a right reinforcing frame 33 supported on the left surface of the right side surface waterproof steel plate, both ends of the top surface waterproof steel plate exceeding the upper reinforcing frame, the upper end of the left reinforcing frame being above the upper end of the left side surface waterproof steel plate, and the upper end of the right reinforcing frame being above the upper end of the right side surface waterproof steel plate; in the B step, the pressing mechanism presses the top surface waterproof steel plate through the upper reinforcing frame, presses the left side surface waterproof steel plate through the left reinforcing frame, and presses the right side surface waterproof steel plate through the right reinforcing frame.

[0042] In the B step, a left concrete fixing strip is poured at the left end of the inner hole ground to fix the lower end of the left side surface waterproof steel plate and prevent the left side surface waterproof steel plate from tilting, and then the pressing mechanism is released from supporting the left side surface waterproof steel plate; a right concrete fixing strip is poured at the right end of the inner hole ground to fix the lower end of the right side surface waterproof steel plate and prevent the right side surface waterproof steel plate from tilting, and then the pressing mechanism is released from supporting the right side surface waterproof steel plate;

[0043] C step comprises the following steps: C1, through the extrusion mechanism support left template and left side face decorative panel support in the left side of left template so that the left side face decorative panel and left side face waterproof steel plate between the formation of arc left side face section cavity, support right template and right side face decorative panel support in the right side of right template so that the right side face decorative panel and right side face waterproof steel plate between the formation of arc right side face section cavity, the upper end of left side face decorative panel is higher than the left end of top face waterproof steel plate, the upper end of right side face decorative panel is higher than the right end of top face waterproof steel plate;C2, the concrete is poured into arc left side face section cavity, the upper end of concrete in arc left side face section cavity is submerged in the left end of top face waterproof steel plate, the concrete in arc left side face section cavity solidification forms the arc left side face section of fixed top face waterproof steel plate left end, the concrete is poured into arc right side face section cavity, the upper end of concrete in arc right side face section cavity is submerged in the right end of top face waterproof steel plate, the concrete in arc right side face section cavity solidification forms the arc left side face section of fixed top face waterproof steel plate right end;C3, the extrusion mechanism loses the support effect of top face waterproof steel plate;C4, through the extrusion mechanism support upper template and top face decorative panel support in the upper side of upper template so that the top face decorative panel and top face waterproof steel plate between the formation of arc top face section cavity, the concrete is poured into arc top face section cavity solidification into arc top face section.

[0044] The extrusion mechanism comprises a moving support table 34, a middle frame 35 connected to the moving support table, a jacking oil cylinder 36 connected to the moving support table, a right extrusion oil cylinder 37 connected to the right side of the middle frame and extending rightwards, and a left extrusion oil cylinder 38 connected to the left side of the middle frame and extending leftwards.

Claims

1. A circular tunnel construction method, the tunnel is surrounded by a circular tunnel side wall and a tunnel bottom wall of a flat structure, the tunnel side wall and the tunnel bottom wall are both concrete structures, the geological condition of the area where the tunnel is located is soil, the tunnel side wall comprises an arc-shaped top surface section, an arc-shaped left side surface section with an upper end connected to the left end of the arc-shaped top surface section, and an arc-shaped right side surface section with an upper end connected to the right end of the arc-shaped top surface section, a top surface of the arc-shaped top surface section is cast with a top surface waterproof steel plate, a lower surface is cast with a top surface decorative panel, a left surface of the arc-shaped left side surface section is cast with a left side surface waterproof steel plate, a right surface is cast with a left side surface decorative panel, a right surface of the arc-shaped right side surface section is cast with a right side surface waterproof steel plate, and a left surface is cast with a right side surface decorative panel; the process of constructing the circular tunnel comprises the following steps: A, building a tunnel inner cavity: excavating an inner hole with a set length in the area of the tunnel being built, the inner hole is located inside the outer contour design position of the tunnel side wall, and the distance between the peripheral surface of the inner hole and the outer contour design position of the tunnel side wall is more than ten centimeters; B, tunnel side wall waterproof layer construction: aligning the top surface waterproof steel plate with the inner hole top wall, the left side surface waterproof steel plate with the inner hole left side wall, and the right side surface waterproof steel plate with the tunnel right side wall, and using an extrusion mechanism to extrude the top surface waterproof steel plate upwards so that the soil of the inner hole top wall is compressed to the outer contour design position of the tunnel side wall, to extrude the left side surface waterproof steel plate to the left so that the soil of the inner hole left side wall is compressed to the outer contour design position of the tunnel side wall, and to extrude the right side surface waterproof steel plate to the right so that the soil of the inner hole right side wall is compressed to the outer contour design position of the tunnel side wall; C, building a concrete layer and installing a decorative panel: supporting the left formwork by the extrusion mechanism, and supporting the left side surface decorative panel on the left side of the left formwork so that an arc-shaped left side surface section cavity is formed between the left side surface decorative panel and the left side surface waterproof steel plate, supporting the right formwork, and supporting the right side surface decorative panel on the right side of the right formwork so that an arc-shaped right side surface section cavity is formed between the right side surface decorative panel and the right side surface waterproof steel plate, and supporting the upper formwork, and supporting the top surface decorative panel 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, pouring concrete into the arc-shaped left side surface section cavity to solidify into an arc-shaped left side surface section, pouring into the arc-shaped right side surface section cavity to solidify into an arc-shaped right side surface section, and pouring into the arc-shaped top surface section cavity to solidify into an arc-shaped top surface section; the upper end surface of the left side surface waterproof steel plate is supported on the left end surface of the top surface waterproof steel plate, the upper end surface of the left side surface waterproof steel plate and the left end surface of the top surface waterproof steel plate are abutted together through a left inclined surface, and the outer end of the left inclined surface is lower than the inner end; the upper end surface of the right side surface waterproof steel plate is supported on the right end surface of the top surface waterproof steel plate, the upper end surface of the right side surface waterproof steel plate and the right end surface of the top surface waterproof steel plate are abutted together through a right inclined surface, and the outer end of the right inclined surface is lower than the inner end.In the B step, the extrusion mechanism first extrudes the top surface waterproof steel plate upward to compress the soil of the inner hole top wall to the tunnel side wall outer contour design position, then extrudes the left side surface waterproof steel plate to the left to compress the soil of the inner hole left side wall to the tunnel side wall outer contour design position and extrudes the right side surface waterproof steel plate to the right to compress the soil of the inner hole right side wall to the tunnel side wall outer contour design position; the bottom wall of the inner hole is provided with a left groove and a right groove extending along the tunnel extension direction; the left groove is provided with a left concrete fixing strip extending along the left groove extension direction to fix the left side surface waterproof steel plate, the lower end of the arc-shaped left side surface section and the lower end of the left side surface decorative panel are both supported in the left groove, and the left end of the tunnel bottom wall is cast together with the left side surface decorative panel; the right groove is provided with a right concrete fixing strip extending along the right groove extension direction to fix the right side surface waterproof steel plate, the lower end of the arc-shaped right side surface section and the lower end of the right side surface decorative panel are both supported in the right groove, and the right end of the tunnel bottom wall is cast together with the right side surface decorative panel, and the arc-shaped left and right side surface waterproof steel plates are fixed to be able to release the support of the extrusion mechanism.

2. A method of circular tunnel construction according to claim 1 wherein, It also includes the upper reinforcing frame supported on the lower surface of the top waterproof steel plate, the left reinforcing frame supported on the right surface of the left side waterproof steel plate and the right reinforcing frame supported on the left surface of the right side waterproof steel plate, the left and right ends of the top waterproof steel plate both exceed the upper reinforcing frame, the upper end of the left reinforcing frame is above the upper end of the left side waterproof steel plate, and the upper end of the right reinforcing frame is above the upper end of the right side waterproof steel plate; in step B, the extrusion mechanism removes the top waterproof steel plate through the upper reinforcing frame, removes the left side waterproof steel plate through the left reinforcing frame, and removes the right side waterproof steel plate through the right reinforcing frame.

3. A method of circular tunnel construction according to claim 2, wherein, The top wall of the inner hole is a circular arc shape concentric with the outer contour of the tunnel side wall.

4. A method of circular tunnel construction according to claim 1 or 2 or 3 wherein, The upper surface of the top 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 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 waterproof steel plate; the left surface of the left side waterproof steel plate is provided with a left side anti-corrosion layer, the upper end of the left side anti-corrosion layer extends above the horizontal plane passing through the upper end edge of the left surface of the left side waterproof steel plate; the right surface of the right side waterproof steel plate is provided with a right side anti-corrosion layer, the upper end of the right side anti-corrosion layer extends above the horizontal plane passing through the upper end edge of the right surface of the right side waterproof steel plate; the top surface anti-corrosion layer is prefabricated on the top waterproof steel plate first, and then the top waterproof steel plate is installed, the left side anti-corrosion layer is prefabricated on the left side waterproof steel plate first, and then the left side waterproof steel plate is installed, and the right side anti-corrosion layer is prefabricated on the right side waterproof steel plate first, and then the right side waterproof steel plate is installed.

5. A method of circular tunnel construction according to claim 1 or 2 or 3 wherein, The upper end of the right surface of the left side waterproof steel plate is provided with a left waterproof steel plate positioning flange lapping to the left end of the lower surface of the top 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 lapping to the right end of the lower surface of the top waterproof steel plate.

6. A method of circular tunnel construction according to claim 1 or 2 or 3 wherein, It also includes the left concrete fixing strip fixing the lower end of the left side waterproof steel plate and the right concrete fixing strip fixing the lower end of the right side waterproof steel plate; in step B, the left concrete fixing strip is poured at the left end of the ground in the inner hole to fix the lower end of the left side waterproof steel plate and prevent the left side waterproof steel plate from tilting, and then the supporting effect of the extrusion mechanism on the left side waterproof steel plate is released; the right concrete fixing strip is poured at the right end of the ground in the inner hole to fix the lower end of the right side waterproof steel plate and prevent the right side waterproof steel plate from tilting, and then the supporting effect of the extrusion mechanism on the right side waterproof steel plate is released; step C includes the following steps: C1, supporting the left template by the extrusion mechanism and supporting the left side face decorative panel on the left side of the left template so that an arc 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 template and supporting the right side face decorative panel on the right side of the right template so that an arc right side face section cavity is formed between the right side face decorative panel and the right side face waterproof steel plate, the upper end of the left side face decorative panel being higher than the left end of the top face waterproof steel plate, and the upper end of the right side face decorative panel being higher than the right end of the top face waterproof steel plate; C2, pouring concrete into the arc left side face section cavity, the upper end of the concrete in the arc left side face section cavity submerging the left end of the top face waterproof steel plate, the concrete in the arc left side face section cavity solidifying to form an arc left side face section fixing the left end of the top face waterproof steel plate, pouring concrete into the arc right side face section cavity, the upper end of the concrete in the arc right side face section cavity submerging the right end of the top face waterproof steel plate, the concrete in the arc right side face section cavity solidifying to form an arc right side face section fixing the right end of the top face waterproof steel plate; C3, making the extrusion mechanism lose the supporting effect on the top face waterproof steel plate; C4, supporting the upper template by the extrusion mechanism and supporting the top face decorative panel on the upper side of the upper template so that an arc top face section cavity is formed between the top face decorative panel and the top face waterproof steel plate, pouring concrete into the arc top face section cavity to solidify into an arc top face section.

7. A method of circular tunnel construction according to claim 1 or 2 or 3 wherein, The lower surface of the left end of the tunnel bottom wall is provided with a left flange extending to the bottom surface of the left groove, the left flange being cast together with the left side face decorative panel and being integrally formed with the tunnel bottom wall; and the lower surface of the right end of the tunnel bottom wall is provided with a right flange extending to the bottom surface of the right groove, the right flange being cast together with the right side face decorative panel and being integrally formed with the tunnel bottom wall.

8. A method of circular tunnel construction according to claim 1 or 2 or 3, wherein, The extrusion mechanism comprises a moving support table, a middle frame connected to the moving support table, a jacking oil cylinder connected to the moving support table, a right extrusion oil cylinder connected to the right side of the middle frame and extending rightwards, and a left extrusion oil cylinder connected to the left side of the middle frame and extending leftwards.

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