Reinforced concrete deck type arch bridge and construction method thereof

Abstract

The invention discloses a reinforced concrete deck-type arch bridge and a construction method thereof, and belongs to the technical field of deck-type arch bridge construction.The arch bridge comprises a main arch ring steel arch frame, the main arch ring steel arch frame is provided with a plurality of spandrel columns, a bridge deck system is arranged at the tops of the spandrel columns, and the two ends of the bridge deck system are each provided with a bridge abutment fixedly connected with a foundation; the two ends of the main arch ring steel arch frame are each provided with an arch support, the two arch supports are fixedly connected with a foundation, and each arch support is provided with a plurality of sand unloading cylinders. The two ends of the main arch ring steel arch frame are each provided with one end triangular section piece, the two end triangular section pieces are hinged to the multiple unloading sand cylinders, the main arch ring steel arch frame is divided into the middle arch crown closure section, the splicing section and the arch foot section, rapid splicing in a factory can be achieved, rapid splicing through a cable crane system on site is facilitated, the construction steps are simplified, and the construction efficiency is improved. The construction efficiency of the reinforced concrete deck type arch bridge is improved, and the construction period of the reinforced concrete deck type arch bridge is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of top-bearing arch bridge construction, and in particular relates to a reinforced concrete top-bearing arch bridge and a construction method thereof. Background Art

[0002] As an important bridge structure, reinforced concrete arch bridges are widely used in the field of bridge engineering. This type of arch bridge has the advantages of large span capacity, strong material adaptability, beautiful bridge shape, good durability, and low maintenance and repair costs. Especially in the case of large spans, reinforced concrete arch bridges can withstand large loads and have good stability, so they are highly favored in transportation infrastructure construction.

[0003] However, there are some problems in the construction process of traditional reinforced concrete arch bridges, which limit their construction speed and efficiency. Specifically, the traditional construction method requires the erection of arch frames during the erection of the arch ring. For concrete slab arches, it is also necessary to install formwork, tie steel cages, remove formwork after pouring concrete, construct the superstructure, and finally remove the arch frames. The whole process is time-consuming and labor-intensive, with a long construction period and high requirements for construction technology.

[0004] In addition, traditional reinforced concrete arch bridges have a large deadweight when the span is large, which places higher demands on the stability of materials and structures. When pouring the concrete arch ring, the slump of the concrete needs to be strictly controlled to ensure the thickness and line shape of the arch ring. At the same time, during the erection and pouring of the arch ring, the out-of-plane stability of the steel plate needs to be ensured to prevent out-of-plane deformation of the steel plate, which further increases the difficulty and complexity of the construction. Summary of the invention

[0005] In view of the deficiencies in the above-mentioned background technology, the present invention aims to provide a reinforced concrete top-supported arch bridge and a construction method thereof, which solve the problems of complex construction and long construction period of existing traditional reinforced concrete arch bridges.

[0006] In order to achieve the above-mentioned invention object, the technical scheme adopted by the present invention is as follows: a reinforced concrete top-supported arch bridge is provided, which includes a main arch ring steel arch frame, and a plurality of transverse distribution beams and a plurality of longitudinal distribution beams are arranged on the top of the main arch ring frame, and a bottom mold is arranged on the top of the plurality of longitudinal distribution beams; the main arch ring is cast on the bottom mold, and a plurality of arch columns are arranged on the main arch ring, and the tops of the plurality of arch columns are flush, and a bridge deck system is arranged on the top of the plurality of arch columns, and a bridge abutment fixedly connected to the foundation is arranged at both ends of the bridge deck system; an arch seat is arranged at both end ends of the main arch ring steel arch frame, and the two arch seats are fixedly connected to the foundation, and each arch seat is arranged with a plurality of unloading sand barrels; an end triangular section is respectively arranged at both ends of the main arch ring steel arch frame, and the two end triangular sections are respectively hinged to the plurality of unloading sand barrels.

[0007] Furthermore, the main arch ring steel arch frame includes multiple columns of steel arch frame units, and a fixed bracket is arranged between two columns of the steel arch frame units.

[0008] Furthermore, the main arch ring steel arch frame includes an intermediate arch crown closing section, and a splicing section and an arch foot section are symmetrically arranged at both ends of the intermediate arch crown closing section; each arch foot section is provided with an end triangular section.

[0009] Furthermore, the single-row steel arch frame unit includes two steel arch frame pieces assembled into a frame to form a single arch rib lifting segment, the two steel arch frame pieces are connected by a welded angle steel support frame, each steel arch frame piece is spliced ​​by multiple sections of Bailey frames, and two adjacent sections of Bailey frames are connected by an adjustable component.

[0010] Furthermore, an end triangular section is provided at the end of each row of the steel arch frame units, and each of the end triangular sections includes a triangular bracket fixedly connected to the end of the steel arch frame unit, and a connecting rod is provided in the triangular bracket; the tip of one side of the triangular bracket is hinged to the unloading sand cylinder.

[0011] Furthermore, each of the unloading sand cylinders includes a bottom cylinder, the bottom of which is fixedly connected to the arch seat, dry standard sand is arranged inside the bottom cylinder, a sand outlet with a plugging cover is arranged at the bottom of the bottom cylinder, a top cylinder is slidingly sealed inside the bottom cylinder, a connecting plate is arranged on the top of the top cylinder, and the tip of one side of the triangular bracket is hinged to the connecting plate.

[0012] The present invention also provides a construction method of a reinforced concrete deck arch bridge, comprising:

[0013] Step 1: Set the arch seat in a base layer with suitable engineering geology below the ground line through site survey, excavate and cast the abutment and arch seat foundation to form the abutment and arch seat, and fix multiple unloading sand cylinders on the arch seat, and adjust the unloading sand cylinders;

[0014] Step 2: pre-fabricate the middle arch crown closing section, multi-section splicing section and arch foot section according to the main arch ring steel arch frame drawing;

[0015] Step 3, using a cable hoist system to hoist two arch foot sections at the same time, first hinge the end triangular sections on the two arch foot sections with the plurality of unloading sand cylinders, then hoist the two splicing sections with the cable hoist system, and assemble the two splicing sections with the two arch foot sections, finally hoist the middle arch crown closing section, and assemble the two sides of the middle arch crown closing section with the two arch foot sections, until the main arch ring steel arch frame is closed;

[0016] Step 4: Perform pre-compression test on the main arch ring steel arch after hoisting and assembly;

[0017] Step 5: After the preloading test is qualified, the main arch ring is cast and multiple arch columns are set on the main arch ring, and the bridge deck system is constructed on the top of the multiple arch columns. After the bridge deck system construction is completed, the cable hanger system is dismantled;

[0018] Step 6: Install bridge deck anti-collision guardrails, construct bridge deck asphalt pavement and public structures, and complete the bridge.

[0019] Furthermore, in step 3, when the cable crane system hoists the arch foot section, the splicing section and the intermediate arch crown closure section, the arch foot section, the splicing section and the intermediate arch crown closure section are lifted off the ground for 10 minutes and observed to be free of abnormal phenomena, and then lifted and towed to the top of the designated installation position for lowering and installation.

[0020] Furthermore, in step 3, when the arch foot section, the splicing section and the intermediate arch crown closing section are hoisted and spliced, the elevation positions of the arch foot section, the splicing section and the intermediate arch crown closing section are monitored in real time, and the installation of each section is strictly controlled according to the layout position.

[0021] Further, in step 4, the pre-pressure detection includes:

[0022] Step 4.1, obtain the most unfavorable load of the main arch ring steel arch;

[0023] Step 4.2, perform pre-pressing inspection;

[0024] Step 4.3, after the inspection is completed, multiple deflection measuring points and stress testing points are set on the main arch ring steel arch, and deflection monitoring devices and stress monitoring devices are set on the deflection measuring points and stress testing points;

[0025] Step 4.4, build a pre-stressing support frame on the main arch ring steel arch, lay wooden boards and bamboo plywood on the pre-stressing support frame to form multiple bearing platforms, and place a pre-stressing special water bag on each bearing platform;

[0026] Step 4.5, inject water into the pre-pressing water bag through the water injection pipe to perform graded pre-pressing on the main arch ring steel arch, and record the total flow of water injection;

[0027] Step 4.6, the deflection monitoring device and the stress monitoring device collect the deflection and stress of the main arch ring steel arch in real time to reflect whether the bearing capacity of the main arch ring steel arch meets the design load requirements. After completing the pre-stressing test, remove the pre-stressing support frame and the pre-stressing special water bag.

[0028] The beneficial effects of the present invention are:

[0029] 1. The reinforced concrete top-decker arch bridge of the present invention can realize rapid splicing in the factory and facilitate rapid assembly on site using a cable hanging system by dividing the main arch ring steel arch frame into intermediate arch crown closing sections, splicing sections and arch foot sections, thereby simplifying the construction steps, accelerating the construction efficiency of the reinforced concrete top-decker arch bridge and shortening the construction period of the reinforced concrete top-decker arch bridge.

[0030] 2. The reinforced concrete top-supported arch bridge of the present invention meets the requirements for unloading the steel arch frame of the main arch ring during the construction of the reinforced concrete top-supported arch bridge by arranging multiple unloading sand cylinders on the arch seat, thereby facilitating the dismantling and adjustment of the position of the steel arch frame of the main arch ring.

[0031] 3. The construction method of the reinforced concrete top-supported arch bridge in the present invention realizes the hoisting and splicing of the main arch ring steel arch frame through a cable hanging system, which not only simplifies the construction steps, but is also applicable to various terrain conditions, especially in areas with complex terrain, such as deep mountains and canyons, and has significant advantages.

[0032] 4. The construction method of the reinforced concrete top-supported arch bridge in the present invention performs pre-stressing test on the main arch ring steel arch before pouring, which not only eliminates the inelastic deformation of the main arch ring steel arch and makes all parts in close contact, but also tests the bearing capacity of the main arch ring steel arch, determines the stability and safety of the main arch ring steel arch, and finally ensures the structural safety and reliability of the arch bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the front view of the reinforced concrete top-supported arch bridge.

[0034] Figure 2 This is a schematic diagram of the front view of the steel arch frame of the main arch ring.

[0035] Figure 3 This is a top-down structural diagram of the main arch ring steel arch frame.

[0036] Figure 4 Schematic diagram of the cross-sectional structure of the main arch ring steel arch frame.

[0037] Figure 5 This is a schematic diagram of the structure of the Bailey frame.

[0038] Figure 6 It is a structural schematic diagram of the cooperation between the end triangle section and the unloading sand cylinder.

[0039] Figure 7 It is the structural schematic diagram of unloading sand cylinder.

[0040] Figure 8 It is a structural schematic diagram of the end triangle section.

[0041] Fig. 9 Schematic diagram of the cable hanger system.

[0042] Figure 10 to Figure 12 This is a construction diagram of a reinforced concrete arch bridge.

[0043] Fig.13 It is a structural schematic diagram of the pre-compression support frame.

[0044] Among them, 1. Main arch ring steel arch frame; 101. Steel arch frame unit; 1011. Steel arch frame piece; 1012. Angle steel support frame; 102. Fixed bracket; 2. Horizontal distribution beam; 3. Longitudinal distribution beam; 4. Bottom formwork; 5. Arch column; 6. Bridge deck system; 7. Abutment; 8. Arch seat; 9. Unloading sand cylinder; 901. Bottom cylinder; 902. Sand outlet; 903. Top cylinder; 904. Connecting plate; 10. End triangular section; 11. Middle arch top closing section; 12. Splicing section; 13. Arch foot section; 14. Bailey frame; 15. Triangular bracket; 16. Connecting rod; 17. Pre-stressing support frame; 18. Special water bag for pre-stressing. DETAILED DESCRIPTION

[0045] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0046] like Figure 1 As shown, the present scheme provides a reinforced concrete top-supported arch bridge, which comprises a main arch ring steel arch frame 1, wherein a plurality of transverse distribution beams 2 and a plurality of longitudinal distribution beams 3 are arranged on the top of the main arch ring steel arch frame 1, and a bottom form 4 is arranged on the top of the plurality of longitudinal distribution beams 3; the main arch ring concrete is poured in the bottom form 4; a plurality of arch upper columns 5 are arranged on the main arch ring, and the tops of the plurality of arch upper columns 5 are flush, and a bridge deck system 6 is arranged on the top of the plurality of arch upper columns, and a bridge abutment 7 fixedly connected to the foundation is arranged at both ends of the bridge deck system 6; an arch seat 8 is arranged at both end ends of the main arch ring steel arch frame 1, and the two arch seats 8 are fixedly connected to the foundation, and a plurality of unloading sand barrels 9 are arranged on each arch seat 8; an end triangular section 10 is arranged at each end of the main arch ring steel arch frame 1, and the two end triangular sections are respectively hinged to the plurality of unloading sand barrels 9.

[0047] Specifically, the main arch ring steel arch frame 1 includes multiple rows of steel arch frame units 101, and a fixed bracket 102 is arranged between two rows of the steel arch frame units 101. The main arch ring steel arch frame 1 includes an intermediate arch crown closing section 11, and a splicing section 12 and an arch foot section 13 are symmetrically arranged at both ends of the intermediate arch crown closing section 11; each arch foot section 13 is provided with an end triangular section 10. A single row of the steel arch frame units 101 includes two steel arch frame pieces 1011 assembled into a frame to form a single arch rib hoisting section, and the two steel arch frame pieces 1011 are connected by a welded angle steel support frame 1012, and each steel arch frame piece 1011 is spliced ​​by multiple sections of Bailey frames 14, and two adjacent sections of Bailey frames 14 are connected by an adjustable component.

[0048] By dividing the main arch ring steel arch frame 1 into the intermediate arch crown closing section 11, the splicing section 12 and the arch foot section 13, not only can rapid splicing be achieved in the factory, but also rapid assembly on site using a cable hanging system is convenient, which simplifies the construction steps, speeds up the construction efficiency of the reinforced concrete top-supported arch bridge, and shortens the construction period of the reinforced concrete top-supported arch bridge.

[0049] Furthermore, each end of the single-row steel arch frame unit 101 is provided with an end triangular section 10, and each end triangular section 10 includes a triangular bracket 5 fixedly connected to the end of the steel arch frame unit 101, and a connecting rod 16 is provided in the triangular bracket 5; the tip of one side of the triangular bracket 5 is hinged to the unloading sand cylinder 9.

[0050] Preferably but not limitedly, each of the unloading sand cylinders 9 includes a bottom cylinder 901, the bottom of which is fixedly connected to the arch seat 8, dry standard sand is arranged inside the bottom cylinder 901, a sand outlet 902 with a plugging cover is arranged at the bottom of the bottom cylinder 901, a top cylinder 903 is slidingly sealed inside the bottom cylinder 901, a connecting plate 904 is arranged on the top of the top cylinder 903, and the tip of one side of the triangular bracket 5 is hinged to the connecting plate 904.

[0051] By arranging a plurality of unloading sand barrels 9 on the arch seat 8, during the construction of the reinforced concrete top-supported arch bridge, the unloading requirements of the main arch ring steel arch frame 1 are met, and the removal and adjustment of the position of the main arch ring steel arch frame 1 are facilitated. Preferably, the unloading sand barrel 9 can also be installed on a temporary pier, and the temporary pier is cast at the same time as the arch seat 8. After the main arch ring steel arch frame 1 is installed and fixed, the unloading sand barrel 9 can be removed by dismantling the temporary pier.

[0052] The present invention also provides a construction method of a reinforced concrete deck arch bridge, comprising:

[0053] Step 1: through site survey, the arch seat 8 is set in the base layer with suitable engineering geology below the ground line, the foundation of the abutment 7 and the arch seat 8 is excavated and cast in situ to form the abutment 7 and the arch seat 8, and a plurality of unloading sand cylinders 9 are fixed on the arch seat 8, and the unloading sand cylinders 9 are adjusted;

[0054] Step 2: pre-fabricate the middle arch crown closing section 11, the multi-section splicing section 12 and the arch foot section 13 according to the main arch ring steel arch frame 1 drawing;

[0055] Step 3, using a cable hoist system to hoist two arch foot sections 13 at the same time, firstly hinge the end triangle sections 10 on the two arch foot sections 13 with the plurality of unloading sand cylinders 9, then hoist two splicing sections 12 by the cable hoist system, and assemble the two splicing sections 12 with the two arch foot sections 13, finally hoist the middle arch crown closing section 11, and assemble the two sides of the middle arch crown closing section 11 with the two arch foot sections 13, until the main arch ring steel arch frame 1 is closed;

[0056] Step 4: Perform pre-compression test on the main arch ring steel arch after hoisting and assembly;

[0057] Step 5: After the preloading test is qualified, the main arch ring is cast and a plurality of arch upper columns 5 are arranged on the main arch ring, and the bridge deck system 6 is constructed on the top of the plurality of arch upper columns 5. After the construction of the bridge deck system 6 is completed, the cable hanging system is removed;

[0058] Step 6: Install bridge deck anti-collision guardrails, construct bridge deck asphalt pavement and public structures, and complete the bridge.

[0059] In the above method, the lifting and splicing of the main arch ring steel arch frame 1 is achieved through a cable hanging system, which not only simplifies the construction steps, but is also applicable to various terrain conditions, especially in areas with complex terrain, such as deep mountains and canyons, and has significant advantages.

[0060] Furthermore, in step 3, when the cable crane system hoists the arch foot section 13, the splicing section 12 and the intermediate arch crown closing section 11, the arch foot section 13, the splicing section 12 and the intermediate arch crown closing section 11 are lifted off the ground for 10 minutes and observed to be free of abnormalities, and then lifted and towed to the top of the designated installation position for lowering and installation.

[0061] Furthermore, in step 3, when the arch foot section 13, the splicing section 12 and the intermediate arch crown closing section 11 are hoisted and spliced, the elevation positions of the arch foot section 13, the splicing section 12 and the intermediate arch crown closing section 11 are monitored in real time, and the installation of each section is strictly controlled according to the layout position.

[0062] Further, in step 4, the pre-pressure detection includes:

[0063] Step 4.1, obtain the most unfavorable load of the main arch ring steel arch;

[0064] Step 4.2, perform pre-pressing inspection;

[0065] Step 4.3, after the inspection is completed, multiple deflection measuring points and stress testing points are set on the main arch ring steel arch, and deflection monitoring devices and stress monitoring devices are set on the deflection measuring points and stress testing points;

[0066] Step 4.4, build a pre-stressing support frame 17 on the main arch ring steel arch, lay wooden boards and bamboo plywood on the pre-stressing support frame 17 to form multiple bearing platforms, and place a pre-stressing special water bag 18 on each bearing platform;

[0067] Step 4.5, inject water into the pre-pressing water bag 18 through the water injection pipe to perform graded pre-pressing on the main arch ring steel arch, and record the total flow of water injection;

[0068] Step 4.6, the deflection monitoring device and the stress monitoring device collect the deflection and stress of the main arch ring steel arch in real time to reflect whether the bearing capacity of the main arch ring steel arch meets the design load requirements. After completing the pre-stressing test, remove the pre-stressing support frame 17 and the pre-stressing special water bag 18.

[0069] In the above method, a pre-stress test is carried out on the main arch ring steel arch before pouring, which not only eliminates the inelastic deformation of the main arch ring steel arch and makes all parts in close contact, but also tests the bearing capacity of the main arch ring steel arch and determines the stability and safety of the main arch ring steel arch, ultimately ensuring the structural safety and reliability of the arch bridge.

Claims

1. A reinforced concrete deck arch bridge, characterized in that: It comprises a main arch ring steel arch frame, the top of which is provided with a plurality of transverse distribution beams and a plurality of longitudinal distribution beams, a bottom form is provided on the top of the plurality of longitudinal distribution beams, and the main arch ring concrete is poured in the bottom form; there are a plurality of arch columns on the main arch ring, the tops of the plurality of arch columns are flush, a bridge deck system is provided on the top of the plurality of arch columns, and a bridge abutment fixedly connected to the foundation is provided at both ends of the bridge deck system; an arch seat is provided at both end ends of the main arch ring steel arch frame, the two arch seats are fixedly connected to the foundation, and a plurality of unloading sand barrels are provided on each arch seat; an end triangular section is provided at each end of the main arch ring steel arch frame, and the two end triangular sections are respectively hinged to the plurality of unloading sand barrels.

2. The reinforced concrete deck arch bridge according to claim 1, characterized in that: The main arch ring steel arch frame includes multiple rows of steel arch frame units, and a fixed bracket is arranged between two rows of steel arch frame units.

3. The reinforced concrete deck arch bridge according to claim 2, characterized in that: The main arch ring steel arch frame includes an intermediate arch crown closing section, and a splicing section and an arch foot section are symmetrically arranged at both ends of the intermediate arch crown closing section; each arch foot section is provided with an end triangular section.

4. The reinforced concrete deck arch bridge according to claim 2, characterized in that: The single-row steel arch frame unit includes two steel arch frame pieces assembled into a frame to form a single arch rib lifting segment. The two steel arch frame pieces are connected by a welded angle steel support frame. Each steel arch frame piece is spliced ​​by multiple sections of Bailey frames, and two adjacent sections of Bailey frames are connected by an adjustable component.

5. The reinforced concrete deck arch bridge according to claim 4, characterized in that: Each end of a single row of the steel arch frame units is provided with an end triangular section, each of the end triangular sections comprises a triangular bracket fixedly connected to the end of the steel arch frame unit, a connecting rod is arranged inside the triangular bracket; a tip on one side of the triangular bracket is hinged to the unloading sand cylinder.

6. The reinforced concrete deck arch bridge according to claim 5, characterized in that: Each of the unloading sand cylinders includes a bottom cylinder, the bottom of which is fixedly connected to the arch seat, dry standard sand is arranged inside the bottom cylinder, a sand outlet with a plugging cover is arranged at the bottom of the bottom cylinder, a top cylinder is slidingly sealed inside the bottom cylinder, a connecting plate is arranged on the top of the top cylinder, and the tip of one side of the triangular bracket is hinged to the connecting plate.

7. A construction method for a reinforced concrete deck arch bridge according to any one of claims 1 to 6, characterized in that: include: Step 1: Set the arch seat in a base layer with suitable engineering geology below the ground line through site survey, excavate and cast the abutment and arch seat foundation to form the abutment and arch seat, and fix multiple unloading sand cylinders on the arch seat, and adjust the unloading sand cylinders; Step 2: pre-fabricate the middle arch crown closing section, multi-section splicing section and arch foot section according to the main arch ring steel arch frame drawing; Step 3, using a cable hoist system to hoist two arch foot sections at the same time, first hinge the end triangular sections on the two arch foot sections with the plurality of unloading sand cylinders, then hoist the two splicing sections with the cable hoist system, and assemble the two splicing sections with the two arch foot sections, finally hoist the middle arch crown closing section, and assemble the two sides of the middle arch crown closing section with the two arch foot sections, until the main arch ring steel arch frame is closed; Step 4: Perform pre-compression test on the main arch ring steel arch after hoisting and assembly; Step 5: After the preloading test is qualified, the main arch ring is cast and multiple arch columns are set on the main arch ring, and the bridge deck system is constructed on the top of the multiple arch columns. After the bridge deck system construction is completed, the cable hanger system is dismantled; Step 6: Install bridge deck anti-collision guardrails, construct bridge deck asphalt pavement and public structures, and complete the bridge.

8. The construction method of a reinforced concrete deck arch bridge according to claim 7, characterized in that: In step 3, when the cable crane system hoists the arch foot section, the splicing section and the intermediate arch crown closure section, the arch foot section, the splicing section and the intermediate arch crown closure section are lifted off the ground for 10 minutes and observed to be free of abnormalities, and then lifted and towed to the top of the designated installation position for lowering and installation.

9. The construction method of a reinforced concrete deck arch bridge according to claim 8, characterized in that: In step 3, when the arch foot section, the splicing section and the intermediate arch crown closing section are hoisted and spliced, the elevation positions of the arch foot section, the splicing section and the intermediate arch crown closing section are monitored in real time, and the installation of each section is strictly controlled according to the layout position.

10. The construction method of a reinforced concrete deck arch bridge according to claim 8, characterized in that: In step 4, the pre-pressure detection includes: Step 4.1, obtain the most unfavorable load of the main arch ring steel arch; Step 4.2, perform pre-pressing inspection; Step 4.3, after the inspection is completed, multiple deflection measuring points and stress testing points are set on the main arch ring steel arch, and deflection monitoring devices and stress monitoring devices are set on the deflection measuring points and stress testing points; Step 4.4, build a pre-stressing support frame on the main arch ring steel arch, lay wooden boards and bamboo plywood on the pre-stressing support frame to form multiple bearing platforms, and place a pre-stressing special water bag on each bearing platform; Step 4.5, inject water into the pre-pressing water bag through the water injection pipe to perform graded pre-pressing on the main arch ring steel arch, and record the total flow of water injection; Step 4.6, the deflection monitoring device and the stress monitoring device collect the deflection and stress of the main arch ring steel arch in real time to reflect whether the bearing capacity of the main arch ring steel arch meets the design load requirements. After completing the pre-stressing test, remove the pre-stressing support frame and the pre-stressing special water bag.

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