An overpass assembled arch ring protection support integrated support and construction method

Abstract

The application discloses an over-crossing assembly type arch ring protection and support integrated support and a construction method, the integrated support comprising arch pieces, side edge supports, support frames and protection plates, the arch pieces being located directly above a track tunnel, the two ends of the arch pieces being bent downward along the transverse direction of the track tunnel and extending to outside the track traffic protection line, each of the two ends of the arch pieces being provided with the side edge supports extending in the same direction, the end portions of the side edge supports being supported on the ground bearing platforms on the same side, the support frames being vertically supported at the connection positions of the side edge supports and the arch pieces, and the protection plates being wrapped around the arch pieces outside the orifices of the track tunnel, thereby forming an open upward and closed protection system. The construction method is used for the construction of the integrated support. The integrated support and the construction method can form a protection above the tunnel orifices, can bear a large load, can reduce the influence on the tunnel structure, can support and protect the construction at the same time, and can shorten the construction period.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, specifically to an integrated support structure and construction method for an overpass prefabricated arch ring protective structure. Background Technology

[0002] During the construction of the arch structure of Shuangqiao Road that crosses the existing railway track, the construction structure is located directly above the tunnel entrance. Under these circumstances, the impact of construction on rail transit at this location is classified as "Extremely High." Therefore, construction in this area can only commence after rail transit has ceased operation and with the approval of the rail operations department. This results in limited construction time and a particularly tight schedule. The large span and heavy load of this construction structure further increase the difficulty of its construction.

[0003] Currently, the following construction techniques are commonly used for the construction of concrete arch rings for bridges: 1. Cast-in-place construction with minimal (or full) scaffolding; 2. Rigid frame construction; 3. Cable-stayed construction. However, since the arch structure spans the railway track, if the first method of erecting conventional scaffolding is used, the foundation will have a significant impact on the railway tunnel structure; while rigid frame construction cannot withstand the large load at this location and cannot provide rigid protection for trains on the track; if cable-stayed construction is used, the erection of cable-stayed structures on both sides will conflict with the subsequent cast-in-place box girder construction. In summary, due to the characteristics of the bridge structure itself and the influence of surrounding structures, conventional construction techniques cannot meet the requirements of on-site construction. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide an integrated support structure and construction method for an overpass prefabricated arch ring protective structure. This structure can not only provide protection above the tunnel opening and withstand large loads, thereby reducing the impact on the tunnel structure, but also support and protection can be constructed simultaneously, thus shortening the construction period.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated support bracket for an upper-span prefabricated arch ring, comprising:

[0006] An arch frame, located directly above the track tunnel, with both ends of the arch frame bending downwards along the transverse direction of the track tunnel and extending beyond the track traffic protection line;

[0007] Side supports, each of the arch frame pieces is provided with side supports extending in the same direction at both ends, and the ends of the side supports are supported on the ground platform on the same side.

[0008] The support frame is vertically supported at the connection between the side bracket and the arch frame piece;

[0009] The protective plate is wrapped around the arched frame above the opening of the track tunnel, thereby forming an upward-opening, closed protective system.

[0010] Furthermore, there are multiple arch frame pieces, which are spaced apart along the longitudinal direction of the track tunnel; adjacent arch frame pieces are connected by multiple transverse connectors.

[0011] Furthermore, the arch frame includes a lower chord, web members, and an upper chord. The two ends of the lower chord are bent downward along the transverse direction of the track tunnel. The upper chord is located above the lower chord, and the two ends of the upper chord are bent downward along the transverse direction of the track tunnel. There are multiple web members, which are connected at intervals between the lower chord and the upper chord.

[0012] Furthermore, the support frame includes foundation piles, which are vertically installed outside the rail transit protection line, and the top of the foundation piles is supported at the connection between the side support and the arch frame piece.

[0013] Furthermore, the support frame also includes a first unloading component and a second unloading component. The height of the first unloading component is adjustable. The first unloading component is disposed on the top of the foundation pile and supported at the end of the lower chord. The side bracket is located in the extension direction of the upper chord and supported at the end of the upper chord. The height of the second unloading component is adjustable. The second unloading component is disposed on the top of the foundation pile and supported on the side bracket.

[0014] Furthermore, the transverse connecting member includes a transverse connecting brace and a steel connecting brace. Two adjacent arch frame pieces are connected to form an arch frame piece group by the transverse connecting brace, and each adjacent arch frame piece group is connected by a steel connecting brace.

[0015] A construction method for an integrated support frame for the protective structure of an overpass prefabricated arch ring includes:

[0016] Provide arch support panels and protective systems;

[0017] Side supports and brackets are installed at intervals along both sides of the longitudinal direction of the track tunnel, and the side supports and brackets are located outside the rail transit protection line;

[0018] The protective system was hoisted to the construction site and positioned above the tunnel opening, supported by side supports and brackets on both sides.

[0019] Install the outer arch panels of the protective system sequentially from the inside out, and support them with corresponding support frames;

[0020] While dismantling the temporary connections of the protective system, the arch frame panels within the protective system are installed one by one. The dismantling of the temporary connections and the installation of the arch frame panels are carried out simultaneously, and are ultimately supported by the corresponding support frames.

[0021] Furthermore, it also includes:

[0022] Before hoisting the protective system, limiters are installed on the support frame to limit the arch feet of the protective system.

[0023] Furthermore, it also includes:

[0024] After the protective system is hoisted into place, the arch frame pieces of the protective system are horizontally connected to the steel pipe piles of the box girder support cast in place on the construction site, and then the arch frame pieces outside the protective system are installed sequentially from the inside to the outside.

[0025] Furthermore, before dismantling the temporary connection structure of the protective system, the protective plates between the lower chords of the arch frame pieces of the protective system must be temporarily fixed with diagonal braces, then the temporary connection of the protective system must be dismantled, and finally the arch frame pieces in the protective system must be connected and fixed to the bottom protective plate.

[0026] The beneficial effects of this invention are:

[0027] The aforementioned integrated support structure and construction method for the prefabricated arch ring protection system involves first fabricating the arch frame pieces and protection system in the factory. Then, side supports and brackets are installed at intervals along both sides of the longitudinal direction of the track tunnel, positioned outside the rail transit protection line. Next, the protection system is hoisted to the construction site, positioned above the tunnel opening, and connected to the side supports, supported by the side brackets.

[0028] Next, install the outer arch frame pieces of the protective system sequentially from the inside out, and support them with the corresponding side brackets and support frames. Then, remove the temporary connections of the protective system, and then install the inner arch frame pieces of the protective system piece by piece, and support them with the corresponding side brackets and support frames.

[0029] This integrated support structure and construction method for the prefabricated arch ring protection system utilizes a three-section design. The entire arch ring support, including the arch frame and the side supports connecting both sides, is divided into three sections. Through the support frame, the traditional compression structure of the arch ring is transformed into a bending beam structure. This reduces the horizontal thrust of the arch ring during construction, minimizing its impact on the track tunnel structure. Simultaneously, it can withstand larger loads, further reducing the impact on the tunnel structure. Furthermore, the protective system formed by the protective plate 500 and the arch frame provides protection for the tunnel opening, thus providing rigid protection for running trains. Additionally, the protective system also creates a temporary construction platform, facilitating the installation of the arch frame both inside and outside the protective system. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0031] Figure 1 This is a schematic elevation view of an integrated support bracket for an upper-span prefabricated arch ring protection according to an embodiment of the present invention;

[0032] Figure 2 A plan view of an integrated bracket for the protection and support of an upper-span prefabricated arch ring, provided in an embodiment of the present invention;

[0033] Figure 3 for Figure 1 The image shown is a front view of the protective system in an integrated bracket for an overlying prefabricated arch ring protective support.

[0034] Figure 4 for Figure 1 The image shown is a top view of the protective system in an integrated bracket for an overlying prefabricated arch ring protective support.

[0035] Figure 5 for Figure 1 The image shows a side view of the protective system in an integrated bracket for an overlying prefabricated arched protective support.

[0036] Figure 6 for Figure 1 The image shows a front view of an arch frame piece in an integrated bracket for the protection and support of an overlying prefabricated arch ring.

[0037] Figure 7 for Figure 1 A schematic diagram of a support frame in an integrated bracket for the protection and support of an overpass prefabricated arch ring is shown.

[0038] Figure 8 for Figure 1 The image shown is a top view of an integrated bracket for the protection and support of an overlying prefabricated arch ring, in which the arch frame pieces are connected by transverse connectors.

[0039] Figure 9 for Figure 1 The diagram shows a structural calculation model of the arch frame piece in an integrated support bracket for an overlying prefabricated arch ring protection structure.

[0040] Figure 10 , 11 12 are respectively Figure 1 The stress diagrams of the upper chord, lower chord, and web members in an integrated support frame for an overlying prefabricated arch ring are shown.

[0041] Figure 13 for Figure 1The diagram shows the displacement analysis of the middle section of the arch frame in an integrated support bracket for the protection of an overpass prefabricated arch ring under pressure.

[0042] Figure 14 for Figure 1 The diagram shows the displacement analysis of the middle section arch frame piece 100 of an integrated support bracket for an overlying prefabricated arch ring under pressure.

[0043] Figure label:

[0044] 100. Arch frame piece; 110. Lower chord; 120. Web member; 130. Upper chord; 200. Transverse connector; 210. Transverse connecting brace; 220. Steel connecting brace; 300. Side support; 400. Support frame; 410. Foundation pile; 420. First unloading component; 430. Second unloading component; 500. Protective plate; 600. Temporary connection structure. Detailed Implementation

[0045] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0046] Please see Figures 1 to 8 The present invention provides an integrated bracket for the protection and support of an upper-span prefabricated arch ring, including an arch frame 100, a side bracket 300, a support frame 400, and a protective plate 500.

[0047] Please see Figures 1 to 5 The arch frame 100 is located directly above the track tunnel. Both ends of the arch frame 100 curve downwards along the transverse direction of the track tunnel and extend beyond the track traffic protection line. Each arch frame 100 has a side support 300 extending in the same direction at both ends, with the ends of the side supports 300 supported on a ground platform on the same side. A support frame 400 provides vertical support at the connection point between the side supports 300 and the arch frame 100. A protective plate 500 wraps around the arch frame 100 above the track tunnel opening, thus forming an upward-opening, closed protective system.

[0048] During construction, the arch frame 100 and the protective system are first manufactured in the factory. Then, side supports 300 and support frames 400 are installed at intervals along both sides of the longitudinal direction of the track tunnel, and the side supports 300 and support frames 400 are positioned outside the rail transit protection line. Next, the protective system is hoisted to the construction site and positioned above the opening of the track tunnel, connected to the side supports 300, and supported by the side support frames 400.

[0049] Next, the arch frame pieces 100 outside the protection system are installed sequentially from the inside out and supported by the corresponding side brackets 300 and support frames 400. Then, the temporary connection of the protection system is removed, and then the arch frame pieces 100 inside the protection system are installed one by one and supported by the corresponding side brackets 300 and support frames 400.

[0050] like Figures 11-14 This integrated prefabricated arch support structure, consisting of an arch frame 100 and two side supports 300 connected to both sides, is divided into three sections. Through the support frame 400, the traditional compression structure of the arch is transformed into a bending beam structure. This reduces the horizontal thrust of the arch during construction, minimizing its impact on the track tunnel structure, while also allowing it to withstand larger loads, further reducing its impact on the tunnel structure. Furthermore, the protective system formed by the protective plate 500 and the arch frame 100 provides protection for the tunnel opening, thus providing rigid protection for the running trains. This achieves a combined load-bearing and protective effect. Additionally, the protective system can form a temporary construction platform, facilitating the installation of the arch frame 100 both inside and outside the protective system.

[0051] In practical implementation, the arch frame 100 can be made into a thin sheet, and multiple arch frame 100s can be set at intervals along the longitudinal direction of the track tunnel. Adjacent arch frame 100s are connected by multiple transverse connectors 200.

[0052] Please see Figure 8 Specifically, the transverse connector 200 includes a transverse connecting brace 210 and a steel connecting brace 220. Two adjacent arch frame pieces 100 are connected to form an arch frame piece group by the transverse connecting brace 210, and each adjacent arch frame piece group is connected by the steel connecting brace 220. This method of using the transverse connector 200 can improve installation efficiency and increase the strength of the entire support.

[0053] Please see Figure 6 In this embodiment, the arch frame 100 includes a lower chord 110, web members 120, and an upper chord 130. The lower chord 110 has both ends bent downwards along the transverse direction of the track tunnel. The upper chord 130 is located above the lower chord 110, and both ends of the upper chord 130 are bent downwards along the transverse direction of the track tunnel. There are multiple web members 120, which are connected at intervals between the lower chord 110 and the upper chord 130.

[0054] In practice, the curvature of the lower chord 110 can be less than that of the upper chord 130.

[0055] Please see Figure 7In this embodiment, the support frame 400 includes foundation piles 410, which are vertically installed outside the rail transit protection line. The top of the foundation piles 410 is supported at the end of the arch frame 100. Since both the side supports 300 and the support frame 400 are located outside the rail transit protection zone, construction can proceed without being affected by the track.

[0056] In practice, the location of the foundation piles 410 should also take into account geological conditions. The foundation piles 410 can be erected by reinforcing steel frames and pouring concrete.

[0057] In a preferred embodiment, the support frame 400 further includes a first unloading component 420 and a second unloading component 430. The height of the first unloading component 420 is adjustable. The first unloading component 420 is disposed on the top of the foundation pile 410 and supported on the end of the lower chord 110. The side bracket 300 is located in the extension direction of the upper chord 130, and one end of the side bracket 300 is fixed to the ground platform, while the other end is supported on the end of the upper chord 130. The height of the second unloading component 430 is adjustable. The second unloading component 430 is disposed on the top of the foundation pile 410 and supported on the side bracket 300.

[0058] In practical implementation, the side support 300 can be a steel frame support, located in the extension direction of the upper chord 130, with one end fixed to the ground platform and the other end supported on the end of the arch frame 100. The steel frame support further enhances the support effect. The main beams of the two side steel frames can be made of 3HN800 steel.

[0059] During construction, first adjust the angle of the steel bracket using the second unloading component 430, then fix the bottom of the steel bracket to the ground support platform, and finally fix the top of the steel bracket to the end of the upper chord 130.

[0060] The entire arch structure is divided into three sections in the horizontal direction. The V2 arch area is mainly divided at the support frame 400 position. The middle part is supported by the arch frame piece 100, and the two sides are supported by the side supports 300.

[0061] The middle section is sectioned according to the transverse spacing of the arch frame segments 100, and the load distribution on the largest arch frame segment 100 is calculated, mainly including the V-frame, the crossbeam (within the projected area), and part of the box girder (within the projected area); other loads are calculated as line loads.

[0062] Based on the overall support layout, each span is sectioned on both sides, and the load distribution on each longitudinal beam is calculated separately, mainly including V-beams, crossbeams (within the projected area), and part of the box girder (within the projected area); other loads are calculated as line loads.

[0063] When the 300mm steel longitudinal beams of the side supports are double-segmented I56a, the overall structure is a simply supported beam structure, which is a bending structure. The detailed calculation model and results are as follows. Figure 9 As shown.

[0064] The 100mm arch frame section in the middle was modeled and calculated using Midas Civil, considering the structure's self-weight, concrete load, construction load, and wind load. The structure type was XZ, and the boundary conditions were simply supported. The left side was DX and DZ, and the right side was DZ. The structural calculation model and results are shown below. Figure 9 As shown. Figure 11 , Figure 12 , Figure 13 These are stress diagrams for the upper chord (130), lower chord (110), and web member (120), respectively. Figure 14 This is a displacement analysis diagram of the middle section arch frame piece 100 under pressure.

[0065] As can be seen from the stress analysis, the middle section of the arch frame is also a simply supported beam under compression. With the addition of the 300mm steel supports on both sides, and the 400mm support frame being broken off, the overall compressed arch structure is divided into three transverse segments, thus becoming a simply supported beam structure under bending. This transforms the traditional compressed arch structure into a bending beam structure, which reduces the horizontal thrust of the construction arch, reduces the impact on the track tunnel structure, and allows it to withstand larger loads, thereby reducing the impact on the tunnel structure.

[0066] This invention also provides a construction method for an integrated support bracket for the upper span prefabricated arch ring, comprising the following steps:

[0067] S. Provide arch frame 100 and protection system;

[0068] Specifically, the upper chord 130 and lower chord 110 can be made of 2I45A steel, and the intermediate web member 120 can be made of 2I25A steel;

[0069] S120. Side supports 300 and support frames 400 are installed at intervals along both sides of the longitudinal direction of the track tunnel, and the side supports 300 and support frames 400 are located outside the rail transit protection line.

[0070] Specifically, the exact installation location of the support frame 400 needs to be determined based on geological conditions, and the elevation of the entire support can be adjusted by using unloading blocks.

[0071] S130. The protection system is hoisted to the construction site and positioned above the tunnel opening, supported by the side supports 300 and support frames 400 on both sides.

[0072] S140. Install the arch frame pieces 100 outside the protection system sequentially from the inside out, and support them with the corresponding support frames 400.

[0073] S150. While dismantling the temporary connections of the protective system, install the arch frame pieces 100 in the protective system piece by piece. The dismantling of the temporary connections and the installation of the arch frame pieces are carried out simultaneously, and finally supported by the corresponding support frame 400.

[0074] In addition, to facilitate the installation of the protective system, limiters can be installed on the support frame 400 before the protective system is hoisted. The limiters can limit the arch feet of the protective system, thereby improving the installation accuracy.

[0075] Specifically, No. 10 steel can be welded onto the corresponding foundation piles 410. Once the protection system is installed, the arch feet of the protection system only need to be placed according to the position of the limiter.

[0076] In a more preferred embodiment, after the protective system is hoisted into place, the arch frame 100 of the protective system is laterally connected to the cast-in-place box girder support steel pipe piles on the construction site, and then the arch frame 100 outside the protective system is installed sequentially from the inside out. The cast-in-place box girder support steel pipe piles on the construction site can provide support for the protective system.

[0077] Furthermore, before dismantling the temporary connection structure 600 of the protective system, the protective plate 500 between the lower chord 110 of the arch frame 100 of the protective system needs to be temporarily fixed with diagonal bracing. Then, the temporary connection structure 600 of the protective system is dismantled, and finally the arch frame 100 in the protective system is connected and fixed to the bottom protective plate 500. This can ensure the lateral stability of the protective system after the temporary connection structure 600 is dismantled.

[0078] By adopting this integrated support structure and construction method for the prefabricated arch ring protection, the entire arch ring support, including the arch frame 100 and the side supports 300 connected on both sides, is divided into three sections. Through the support frame 400, the traditional compression structure of the arch ring can be transformed into a bending beam structure. This reduces the horizontal thrust of the construction arch ring, reduces the impact on the track tunnel structure, and can withstand larger loads, thereby reducing the impact on the tunnel structure. In addition, the protective system formed by the protective plate 500 and the arch frame 100 can protect the tunnel opening, thus providing rigid protection for the running track train.

[0079] In addition, constructing the supporting structure and the protective structure simultaneously during construction can reduce the construction period and also reduce the installation and disassembly of unnecessary parts in intermediate steps, thereby reducing material waste.

[0080] In addition, the protective system can not only provide protection, but also serve as a temporary construction platform, thereby reducing the time spent setting up and dismantling the construction platform and saving some construction costs.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A prefabricated arch-shaped protective support integrated bracket, characterized in that, include: An arch frame, located directly above the track tunnel, with both ends of the arch frame bending downwards along the transverse direction of the track tunnel and extending beyond the track traffic protection line; Side supports, each of the arch frame pieces is provided with side supports extending in the same direction at both ends, and the ends of the side supports are supported on the ground platform on the same side. The support frame is vertically supported at the connection between the side bracket and the arch frame piece; and The protective plate is wrapped around the arched frame above the opening of the track tunnel, thereby forming an upward-opening, closed protective system; The arch frame includes a lower chord, web members, and an upper chord. The two ends of the lower chord bend downward along the transverse direction of the track tunnel. The upper chord is located above the lower chord, and the two ends of the upper chord bend downward along the transverse direction of the track tunnel. There are multiple web members, which are connected between the lower chord and the upper chord at intervals. The support frame includes a foundation pile, a first unloading component, and a second unloading component. The foundation pile is vertically installed outside the rail transit protection line, and the top of the foundation pile is supported at the connection between the side support and the arch frame piece. The height of the first unloading component is adjustable. The first unloading component is located at the top of the foundation pile and supported at the end of the lower chord. The side bracket is located in the extension direction of the upper chord and supported at the end of the upper chord. The height of the second unloading component is adjustable. The second unloading component is located at the top of the foundation pile and supported on the side bracket.

2. The integrated bracket for the upper-span prefabricated arch ring protective support according to claim 1, characterized in that, The arch frame consists of multiple pieces, which are spaced apart along the longitudinal direction of the track tunnel; adjacent arch frame pieces are connected by multiple transverse connectors.

3. The integrated bracket for the upper-span prefabricated arch ring protective support according to claim 2, characterized in that, The transverse connecting member includes a transverse connecting brace and a steel connecting brace. Two adjacent arch frame pieces are connected to form an arch frame piece group by the transverse connecting brace, and each adjacent arch frame piece group is connected by a steel connecting brace.

4. A construction method using the integrated support frame for the upper-span prefabricated arch ring as described in claim 1, characterized in that, include: Provide arch support panels and protective systems; Side supports and brackets are installed at intervals along both sides of the longitudinal direction of the track tunnel, and the side supports and brackets are located outside the rail transit protection line; The protective system was hoisted to the construction site and positioned above the tunnel opening, supported by side supports and brackets on both sides. Install the outer arch panels of the protective system sequentially from the inside out, and support them with corresponding support frames; While dismantling the temporary connections of the protective system, the arch frame panels within the protective system are installed one by one. The dismantling of the temporary connections and the installation of the arch frame panels are carried out simultaneously, and are ultimately supported by the corresponding support frames.

5. The construction method of the integrated support bracket for the prefabricated arch ring protection as described in claim 4, characterized in that, Also includes: Before hoisting the protective system, limiters are installed on the support frame to limit the arch feet of the protective system.

6. The construction method of the integrated support bracket for the upper-span prefabricated arch ring protection as described in claim 5, characterized in that, Also includes: After the protective system is hoisted into place, the arch frame pieces of the protective system are horizontally connected to the steel pipe piles of the box girder support cast in place on the construction site, and then the arch frame pieces outside the protective system are installed sequentially from the inside to the outside.

7. The construction method of the integrated support bracket for the prefabricated arch ring protection as described in claim 6, characterized in that, This also includes temporarily fixing the protective plates between the lower chords of the arch frame pieces of the protective system using diagonal braces before dismantling the temporary connection structure of the protective system, and finally connecting and fixing the arch frame pieces and the bottom protective plate in the protective system.

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