Modular waling structure for tunnel construction

Abstract

The application discloses a modularization surrounding purlin structure for tunnel construction, which comprises an arch module, a supporting module and a plurality of supporting frames on both sides of the arch module, wherein the arch module comprises an arc-shaped frame which is spliced by a plurality of arc units; the supporting module is provided with a plurality of groups of cuboid frame-shaped module units with different sizes, and the plurality of groups of module units are symmetrically and superposedly arranged in a space surrounded by the arch module; each group of module units is surrounded by a plurality of horizontal rods and a plurality of vertical rods; the outer periphery of both ends of each vertical rod is welded with two'['shaped channel steels; the both ends of any horizontal rod are perpendicularly welded on the channel steels of the opposite two vertical rods; and each horizontal rod partially exceeds the end portions of the two vertical rods to form a limiting guide. The application has flexible structure, is convenient to disassemble and is suitable for standard sections with relatively short continuous length and special-shaped sections such as cross sections.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and more particularly to a modular purlin structure for tunnel construction. Background Art

[0002] A purlin is a steel beam installed above the support piles. Its primary function is to maintain the assembled formwork in a flat shape and connect the formwork to the lifting frame. Within the support system, the stiffness of the purlin significantly impacts the stiffness of the entire support structure. Steel purlins, also known as steel fences or steel fences, are generally constructed by splicing two or more sections of the same type and length. The splicing process must ensure high quality and that the multiple sections bear the load together. Steel purlins connect the supports and the retaining piles. The gaps between them are filled with fine aggregate concrete to secure the steel supports and transfer the load. Existing purlin structures suffer from several drawbacks, including the heavy workload of installation and removal and the difficulty of hoisting and positioning the steel formwork. Patent application number 201720232910.1 discloses a quick-install purlin system. While this solves the installation and removal issues, it remains difficult to adapt to construction environments with short, standard sections or irregular sections such as intersections, resulting in limited flexibility. Summary of the Invention

[0003] One object of the present invention is to provide a modular purlin structure for tunnel construction, which is easy to disassemble and can be flexibly combined, and is suitable for standard sections with short continuous lengths as well as special-shaped sections such as intersections.

[0004] In order to achieve these objects and other advantages according to the present invention, according to one aspect of the present invention, there is provided a modular purlin structure for tunnel construction, comprising:

[0005] The arch module includes a plurality of brackets on both sides and an arc-shaped frame on the top, wherein the arc-shaped frame is formed by splicing a plurality of arc-shaped units;

[0006] The support module is provided with multiple groups of rectangular frame-shaped module units of different sizes. The multiple groups of module units are symmetrically stacked and supported in the space surrounded by the arch module. Each group of module units is surrounded by multiple cross bars and multiple vertical bars. Two "["-shaped channel steels are welded to the outer periphery of both ends of each vertical bar. The two ends of any cross bar are perpendicularly welded to the channel steels of the two opposite vertical bars, and each cross bar partially exceeds the ends of the two vertical bars to form a limit edge.

[0007] Among them, adjacent module units are connected by multiple groups of connecting parts, each group of connecting parts includes a steel plate and multiple welded pipes, and the multiple welded pipes are welded to one side or both sides of the steel plate. Any welded pipe is plugged and welded to the end of any vertical pole, and the edge of the steel plate is embedded in the inner side of the limit edge of the adjacent horizontal bar.

[0008] Preferably, the multiple groups of connecting pieces are divided into single-pin tubes, double-pin tubes, four-pin tubes and eight-pin tubes according to the number of welding tubes, which are respectively used for welding with corresponding numbers of vertical poles.

[0009] Preferably, a plurality of module bases are provided at the bottom of the support module, each module base includes a metal plate and a plurality of steel pipes, one end of the plurality of steel pipes is welded to the top of the metal plate, and the other end is plug-welded with a corresponding number of vertical poles, and the edge of the metal plate is embedded in the inner side of the limit edge of the adjacent horizontal bar.

[0010] Preferably, a plurality of lateral supporting members are provided on both sides of the support module and between adjacent brackets, each lateral supporting member includes a first square steel welded to the bracket, a limit block welded to the side wall of any cross bar, and a screw and a scaffolding tube arranged between the first square steel and the limit block, a first support plate and a second support plate are welded on the side close to the first square steel and the limit block, an internal thread is provided on the inner wall of the scaffolding tube, one end of the screw is screwed into the scaffolding tube, and the other end is rotatably connected to the first support plate, and the other end of the scaffolding tube is welded to the second support plate.

[0011] Preferably, a plurality of "J"-shaped steel bar pull rings are welded on the side walls of each bracket of the arch module, and the two sides of the support module are connected to the plurality of steel bar pull rings on the adjacent brackets through steel wire ropes and basket screws.

[0012] Preferably, a plurality of arch supporting members are provided on the top of the support module to support the arc frame, and the arch supporting members include a fixing plate welded to the top of any vertical pole, a threaded hole coaxial with the vertical pole is provided on the fixing plate, a screw is screwed into the threaded hole, a third supporting plate is rotatably provided on the top of the screw, a second square steel is welded on the third supporting plate, and a steel wedge is used to fill the top of the second square steel with the bottom of the arc frame.

[0013] Preferably, adjacent module units are fixedly connected with a plurality of "U"-shaped bolts, and the riding bolts are tightened around the periphery of adjacent multiple cross bars or multiple vertical bars.

[0014] Preferably, both ends of each arc-shaped unit are respectively provided with wedge-shaped cutouts that match each other.

[0015] Preferably, the installation process of the modular purlin structure is as follows:

[0016] Step 1: Level the ground at the tunnel construction site using the reserved leveling layer of crushed stone, compact it, clean both sides of the tunnel, determine the positions of the brackets on both sides of the arch module, set the positioning steel bars, and place the brackets in place according to the positions of the positioning steel bars. Adjust the verticality, spacing, and top height of the brackets, weld the brackets to the positioning steel bars, weld multiple "J"-shaped steel bar pull rings on the side walls of each bracket, and make temporary oblique supports on both sides of the brackets.

[0017] Step 2: Install the module base, that is, place multiple sleepers on the reserved leveling layer along the line direction, position and install multiple metal plates on the sleepers, weld multiple steel pipes on the metal plates, determine the combination of multiple groups of module units according to the span and height of each section in the hole, transport the pre-assembled corresponding module units to the construction site, lift them into place with a forklift, manually assist in positioning, and use multiple groups of connectors to weld and fix them, and use "U"-shaped bolts to connect and fix them in the middle of adjacent module units;

[0018] Step 3: Lift each arc unit that has passed the processing to the action position, first use seamless steel pipes or I-beams for temporary support, and then use bolts to connect them to the brackets in turn, check the position of the arc frame, tighten each arc unit with bolts, install multiple arch support members on the top of the support module to support the arc frame, install multiple lateral support members between the two sides of the support module and the adjacent brackets, and use wire ropes and basket screws to connect and fix the two sides of the support module to the multiple steel bar pull rings on the adjacent brackets.

[0019] The present invention has at least the following beneficial effects: the present invention is applicable to various tunnel sections by flexibly combining modular units of various sizes; adjacent rectangular modules are connected by connectors with different numbers of welded pipes, which has good structural stability and ensures the overall stability of the structure during the subsequent concrete vibration process.

[0020] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a technical solution of the present invention;

[0022] Figure 2 This is a schematic diagram of the end processing of a vertical pole in a technical solution of the present invention;

[0023] Figure 3 This is a schematic diagram of the connection between the horizontal rod and the vertical rod in another technical solution of the present invention;

[0024] Figure 4This is a schematic diagram of the connection of arc units in another technical solution of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a steel bar pull ring in another technical solution of the present invention;

[0026] Figure 6 A top view of a connecting member in another technical solution of the present invention;

[0027] Figure 7 This is a front view of a connecting member in another technical solution of the present invention;

[0028] Figure 8 This is a structural diagram of a module base in another technical solution of the present invention;

[0029] Figure 9 This is a schematic structural diagram of a "U"-shaped bolt in another technical solution of the present invention;

[0030] Figure 10 It is a structural schematic diagram of an arch supporting member in another technical solution of the present invention;

[0031] Figure 11 It is a structural schematic diagram of a lateral supporting member in another technical solution of the present invention;

[0032] Figure 12 This is a schematic diagram of the arch formwork assembly. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can implement the invention with reference to the description.

[0034] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0035] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The orientations or positional relationships indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0036] like Figures 1 to 12 As shown, the present invention provides a modular purlin structure for tunnel construction, comprising:

[0037] The arch module includes a plurality of brackets 100 on both sides and an arc-shaped frame 101 on the top. The arc-shaped frame 101 is composed of a plurality of arc-shaped units 102;

[0038] The supporting module is provided with multiple groups of rectangular frame-shaped module units 200 of different sizes. The multiple groups of module units 200 are symmetrically stacked and supported in the space surrounded by the arch module. Each group of module units 200 is surrounded by multiple cross bars 201 and multiple vertical bars 202. Two "["-shaped channel steels 203 are welded to the outer periphery of both ends of each vertical bar 202. The two ends of any cross bar 201 are perpendicularly welded to the channel steels 203 of the two opposite vertical bars 202, and each cross bar 201 partially exceeds the ends of the two vertical bars 202 to form a limit edge.

[0039] Among them, adjacent module units 200 are connected by multiple groups of connecting parts, each group of connecting parts includes a steel plate 300 and multiple welded pipes 301, and the multiple welded pipes 301 are welded on one side or both sides of the steel plate 300. Any welded pipe 301 is plug-welded to the end of any vertical pole 202, and the edge of the steel plate 300 is embedded in the inner side of the limit edge of the adjacent horizontal bar 201.

[0040] In this technical solution, the modular purlin structure used for tunnel construction is provided with an arch module and a support module. The arch module includes an arc-shaped frame 101 that matches the top of the tunnel, and a plurality of brackets 100 arranged on both sides of the tunnel. The support module is supported and arranged in the space enclosed by the arch module, and is assembled by stacking and arranging a plurality of modular units 200 of different sizes. Each modular unit 200 is a rectangular frame structure surrounded by a plurality of vertical poles 202 and horizontal bars 201, wherein the vertical poles 202 and horizontal bars 201 are respectively made of seamless steel pipes of different sizes. The two ends of each vertical pole 202 are reinforced by butt welding with 15cm long double [12 channel steel 203, and then the end of the horizontal bar 201 is welded to the outside of the channel steel 203. During welding, the horizontal bar 201 is 25mm higher than the vertical pole 20, serving as a limit edge for the connecting piece. Adjacent module units 200 are connected by connectors, which are homemade steel pipe pins, welded from a 20mm steel plate 300 and a plurality of welded pipes 301. The height of the welded pipes 301 is 5cm. Different numbers of welded pipes 301 are selected for welding according to the connection needs of each module unit 200. The welded pipes 301 can be welded on one side of the steel plate 300 or symmetrically arranged on both sides. They are divided into single-pin pipes, double-pin pipes, four-pin pipes and eight-pin pipes. In this technical solution, each module unit 200 and arc unit 102 are prefabricated in the factory in advance and transported to the construction site for assembly and splicing, which effectively improves construction efficiency. Module units 200 of different sizes can be selected according to the cross-sectional dimensions of different tunnels and assembled in different ways, making them universal for multiple cross-sections. They can also be applied to standard cross-sections with shorter continuous lengths and special-shaped cross-sections such as intersections, which is highly flexible. Different connectors are used to connect different module units 200, which is easy to disassemble, and the protruding portion of the crossbar 201 itself is used as a limit edge, which makes the structure stable.

[0041] In other technical solutions, multiple sets of connectors are divided into single-pin, double-pin, four-pin, and eight-pin types based on the number of welded pipes 301, each used to weld to a corresponding number of uprights 202. In this technical solution, multiple welded pipes 301 are either arranged on a single side of the steel plate 300 or symmetrically on both sides of the steel plate 300 to meet different construction requirements.

[0042] In other technical solutions, a plurality of module bases 209 are provided at the bottom of the support module, each module base 209 includes a metal plate 210 and a plurality of steel pipes 211, one end of the plurality of steel pipes 211 is welded to the top of the metal plate 210, and the other end is plugged and welded to a corresponding number of vertical poles 202, and the edge of the metal plate 210 is embedded in the inner side of the limit edge of the adjacent horizontal bar 201. In this technical solution, in order to ensure the accurate installation of the support module, a 40mm gravel reserved leveling layer 212 is laid on the ground of the work site, and sleepers 213 are laid on the reserved leveling layer 212 along the line direction. The top elevation of the sleeper 213 is controlled at -0.08m (8cm below the finished floor surface). A metal plate 210 is installed on the sleeper 213. The metal plate 210 is a 20mm thick steel plate. A steel pipe 211 is welded to the top of the thick steel plate. The steel pipe 211 is inserted into the bottom of the corresponding vertical pole 202, and the metal plate 210 is embedded in the inner side of the limit edge of the adjacent horizontal bar 201 and welded and fixed.

[0043] In other technical solutions, multiple lateral supporting members 219 are arranged between the two sides of the support module and the adjacent brackets 100, and each lateral supporting member 219 includes a first square steel 220 welded to the bracket 100, a limit block 221 welded to the side wall of any cross bar 201, and a screw 222 and a scaffolding tube 223 arranged between the first square steel 220 and the limit block 221. The first square steel 220 and the limit block 221 are welded with a first support plate 224 and a second support plate 225 on the side close to each other, and the inner wall of the scaffolding tube 223 is provided with an internal thread. One end of the screw is screwed into the scaffolding tube, and the other end is rotatably connected to the first support plate 224. The other end of the scaffolding tube is welded to the second support plate 225. In this technical solution, the bracket 100 and the adjacent module unit 200 are tightened by a lateral supporting member 219, square steel is welded on the bracket, and [12 channel steel is welded on the adjacent cross bar as a limit block. The limit block and the square steel are tightened by a screw to improve the structural stability.

[0044] In other technical solutions, a plurality of "J"-shaped steel bar pull rings 110 are welded on the side wall of each bracket 100 of the arch module, and the two sides of the support module are connected to the plurality of steel bar pull rings 110 on the adjacent brackets 100 by steel wire ropes and basket screws. In this technical solution, a plurality of "J"-shaped steel bar pull rings 110 are set on the side wall of the bracket 100, and the bracket 100 can be an I-beam, and the steel bar pull rings 110 are set on the web of the I-beam, such as Figure 5 As shown, a steel wire rope is passed through the steel bar pull ring 110 and wrapped around the vertical pole 202 of the adjacent module. The two ends of the steel wire rope are connected with a basket screw and the tightness is adjusted to improve the structural stability.

[0045] In other technical solutions, a plurality of arch supports 229 are provided at the top of the support module to support the arc frame 101. The arch supports 229 include a fixing plate 230 welded to the top of any vertical pole 202. The fixing plate 230 is provided with a threaded hole coaxial with the vertical pole 202, into which a screw 231 is screwed. A third support plate 232 is rotatably provided on the top of the screw 231. A second square steel 233 is welded to the third support plate 232. A steel wedge 234 is used to fill the gap between the top of the second square steel 233 and the bottom of the arc frame 101. In this technical solution, the length of the arch supports 229 can be adjusted by rotating the screw 231 to accommodate different distances between different positions of the support module and the arc frame 101. At the same time, the steel wedge 234 is used to fill the gap, thereby ensuring the support force of the support module on the arc frame 101 and improving the structural stability.

[0046] In other technical solutions, adjacent modular units 200 are fixedly connected by multiple "U"-shaped bolts 240. These "U"-shaped bolts 240 are fastened around the periphery of multiple adjacent crossbars 201 or multiple vertical poles 202. In this technical solution, the "U"-shaped bolts 240, also known as saddle bolts, surround the periphery of multiple parallel and adjacent crossbars 201 or vertical poles 202 and are tightened with nuts to secure them, thereby improving the stability of the structure.

[0047] In other technical solutions, both ends of each arc-shaped unit 102 are respectively provided with mutually matching wedge-shaped cutouts. In this technical solution, the wedge-shaped cutouts are provided to facilitate disassembly.

[0048] In other technical solutions, the installation process of the modular purlin structure is as follows:

[0049] Step 1: Level the ground of the tunnel construction site with a reserved leveling layer of crushed stone, tamp it, clean both sides of the tunnel, determine the positions of the brackets on both sides of the arch module, set the positioning steel bars, place the brackets in place in sequence according to the positions of the positioning steel bars, adjust the verticality, spacing and top height of the brackets 100, weld the brackets 100 to the positioning steel bars, weld multiple "J"-shaped steel bar pull rings on the side walls of each bracket 100, and make temporary oblique supports on both sides of the bracket 100;

[0050] Step 2: Install the module base 209, that is, place multiple sleepers on the reserved leveling layer along the line direction, position and install multiple metal plates on the sleepers, weld multiple steel pipes on the metal plates, determine the combination of multiple groups of module units 200 according to the span and height of each section in the hole, transport the pre-assembled corresponding module units 200 to the construction site, lift them into place with a forklift, manually assist in positioning, and use multiple groups of connecting parts to weld and fix them. In the middle of adjacent module units 200, use "U"-shaped bolts to connect and fix them;

[0051] Step 3: Lift each arc unit 102 that has passed the processing to the action position, first use seamless steel pipes or I-beams for temporary support, and then use bolts to connect to the bracket 100 in turn, check the position of the arc frame 101, tighten each arc unit 102 with bolts, install multiple arch support members 229 on the top of the support module to support the arc frame 101, install multiple side support members 219 between the two sides of the support module and the adjacent bracket 100, and use wire ropes and basket screws to connect and fix the two sides of the support module to the multiple steel bar pull rings on the adjacent bracket 100.

[0052] In the above technical solution, the anchoring depth of the positioning steel bars shall not be less than 40cm, the exposed depth shall not be less than 20cm, and the top elevation of the sleepers shall be controlled at -0.08 (8cm below the finished floor surface). In addition, after the installation of the arch modules and support modules in step three is completed, in order to prevent the steel formwork from being deformed by stress in the middle during the concrete pouring process, a secondary arch frame is added between adjacent arch modules. The secondary arch frame is made of φ42×3.5mm seamless steel pipe and is bent according to the cross-sectional contour. The formwork is then installed. The order of formwork installation is to install the side wall formwork first, then the arch formwork, and finally the end formwork. The end formwork uses a wooden board with a width of 30cm and a thickness of 5cm. Figure 12 As shown, to facilitate assembly and disassembly, the arch formwork 400 should be installed with at least one set of trapezoidal formwork 401. Any gaps between the arch formwork and the curved frame 101 can be filled with wedge-shaped wooden blocks. To avoid extensive hot work during concrete pouring due to the lack of a reserved concrete pouring window, a concrete vibrating window (feed port) must be reserved during formwork installation. The vertical spacing between the vibrating windows (feed ports) should be no greater than 2.5m, the distance from the end formwork no greater than 1.8m, the horizontal (circumferential) spacing no greater than 2.0m, and the dimensions no less than 450mm*450mm. The surrounding formwork should be reinforced to prevent deformation. Taking into account the longitudinal length of the on-site composite formwork (9m per cycle) and the length of the individual formwork panels (1.5m x 0.6m for the sidewall formwork), the detailed specifications are as follows: The vibrating windows (feed ports) measure 0.6m x 0.4m (cold-cut from the existing formwork), located 1.5m from the end of the formwork, with a longitudinal spacing of 2.0m. The windows are arranged in a plum blossom pattern. When the concrete pouring height drops to the window opening, the cut formwork is bolted together to seal the formwork. To prevent leakage during the concrete pour, the joints are sealed with geotextiles. After the formwork is installed, turnbuckles and fine steel wire ropes are used to press the formwork onto the support modules. Brackets 100 are then pressed onto the support modules using turnbuckles and fine steel wire ropes through pre-reinforced steel rings. The modules and brackets 100 are both pulled and supported to form a single unit. The vertical spacing between the purlins and turnbuckles is based on the number of module layers, and the longitudinal spacing is based on the spacing between the main arches. The vault is secured with turnbuckles and plastic baling rope. Once the support system is reinforced, the attached vibrator is installed.

[0053] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A modular purlin structure for tunnel construction, characterized in that: include: The arch module includes a plurality of brackets on both sides and an arc-shaped frame on the top, wherein the arc-shaped frame is formed by splicing a plurality of arc-shaped units; The support module is provided with multiple groups of rectangular frame-shaped modular units of different sizes. The multiple groups of modular units are symmetrically stacked and supported in the space surrounded by the arch module. Each group of modular units is surrounded by multiple cross bars and multiple vertical bars. Two "["-shaped channel steels are welded to the outer periphery of both ends of each vertical bar. The two ends of any cross bar are perpendicularly welded to the channel steels of the two opposite vertical bars, and each cross bar partially extends beyond the ends of the two vertical bars to form a limit edge. In which, adjacent module units are connected by multiple groups of connecting parts, each group of connecting parts includes a steel plate and multiple welded pipes, and the multiple welded pipes are welded to one side or both sides of the steel plate respectively, and any welded pipe is plugged and welded to the end of any vertical pole, and the edge of the steel plate is embedded in the inner side of the limit edge of the adjacent cross bar; multiple lateral top support members are arranged between the two sides of the support module and the adjacent brackets, and each lateral top support member includes a first square steel welded to the bracket, a limit block welded to the side wall of any cross bar, and a screw and scaffolding tube arranged between the first square steel and the limit block, and the first support plate and the second support plate are welded on the side close to the first square steel and the limit block, and the inner wall of the scaffolding tube is provided with an internal thread, one end of the screw is matched and screwed into the scaffolding tube, and the other end is rotatably connected to the first support plate, and the other end of the scaffolding tube is welded to the second support plate.

2. The modular purlin structure for tunnel construction according to claim 1, characterized in that: Multiple groups of connecting pieces are divided into single-pin tube, double-pin tube, four-pin tube and eight-pin tube according to the number of welded pipes, which are respectively used for welding with corresponding numbers of vertical poles.

3. The modular purlin structure for tunnel construction according to claim 1, characterized in that: A plurality of module bases are provided at the bottom of the support module, each module base includes a metal plate and a plurality of steel pipes, one end of the plurality of steel pipes is welded to the top of the metal plate, and the other end is plugged and welded to a corresponding number of vertical poles, and the edge of the metal plate is embedded in the inner side of the limit edge of the adjacent horizontal bar.

4. The modular purlin structure for tunnel construction according to claim 1, wherein: A plurality of "J"-shaped steel bar pull rings are welded on the side walls of each bracket of the arch module, and the two sides of the support module are connected to the plurality of steel bar pull rings on the adjacent brackets through steel wire ropes and basket screws.

5. The modular purlin structure for tunnel construction according to claim 1, characterized in that: The top of the support module is provided with multiple arch supporting members to support the arc frame. The arch supporting members include a fixing plate welded to the top of any vertical pole. The fixing plate is provided with a threaded hole coaxial with the vertical pole. A screw is screwed into the threaded hole. A third supporting plate is rotatably provided on the top of the screw. A second square steel is welded on the third supporting plate. The top of the second square steel and the bottom of the arc frame are filled with steel wedges.

6. The modular purlin structure for tunnel construction according to claim 1, wherein: Adjacent module units are fixedly connected with a plurality of "U"-shaped bolts, and the "U"-shaped bolts are fastened around the periphery of adjacent multiple horizontal bars or multiple vertical bars.

7. The modular purlin structure for tunnel construction according to claim 1, characterized in that: Both ends of each arc-shaped unit are respectively provided with wedge-shaped cutouts that match each other.

8. The modular purlin structure for tunnel construction according to any one of claims 1 to 7, characterized in that: The installation process is: Step 1: Level the ground at the tunnel construction site using the reserved leveling layer of crushed stone, compact it, clean both sides of the tunnel, determine the positions of the brackets on both sides of the arch module, set the positioning steel bars, and place the brackets in place according to the positions of the positioning steel bars. Adjust the verticality, spacing, and top height of the brackets, weld the brackets to the positioning steel bars, weld multiple "J"-shaped steel bar pull rings on the side walls of each bracket, and provide temporary diagonal supports on both sides of the brackets. Step 2: Install the module base, that is, place multiple sleepers on the reserved leveling layer along the line direction, position and install multiple metal plates on the sleepers, weld multiple steel pipes on the metal plates, determine the combination of multiple groups of module units according to the span and height of each section in the hole, transport the pre-assembled corresponding module units to the construction site, lift them into place with a forklift, manually assist in positioning, and use multiple groups of connecting parts to weld and fix them. In the middle of adjacent module units, use "U"-shaped bolts to connect and fix them; Step 3: Lift each arc unit that has passed the processing to the action position, first use seamless steel pipes or I-beams for temporary support, and then use bolts to connect them to the brackets in turn, check the position of the arc frame, tighten each arc unit with bolts, install multiple arch support members on the top of the support module to support the arc frame, install multiple lateral support members between the two sides of the support module and the adjacent brackets, and use wire ropes and basket screws to connect and fix the two sides of the support module to the multiple steel bar pull rings on the adjacent brackets.

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