A support system for in-situ cast arch bridges on water and its construction method

Abstract

The present invention discloses a support system for an in-situ cast arch bridge on water and its construction method, belonging to the field of building construction. This system includes an arched grid, two groups of cast-in-place bored piles symmetrically arranged on the left and right at the bottom of the water, a bearing platform foundation fixed to the top of each group of cast-in-place bored piles, and a pier fixed to the upper surface of the bearing platform foundation; a support frame body is also fixed on the bearing platform foundation inside each pier; both ends of the arched grid are respectively fixed on the upper surfaces of two symmetrical support frame bodies, and the entire arched grid covers the water surface between the two support frame bodies; at least two rows of symmetrical support bodies are vertically connected from the bottom surface of the arched grid to the bottom of the water; the support body includes a support combined frame body, a support platform, and a steel pipe pile connected in sequence, and the bottom end of the steel pipe pile is inserted into the bottom of the water. This system does not require backfilling crushed stone soil and pouring a concrete cushion in the water to facilitate the erection of a full hall scaffold and a construction platform, is environmentally friendly, can complete the erection of the in-situ cast arch bridge support system more efficiently, saves labor employment, and ensures quality.

Description

Technical Field

[0001] The present invention belongs to the field of building construction, and more particularly, relates to a support system for a cast-in-situ arch bridge over water and a construction method thereof. Background Art

[0002] Currently, most of the cast-in-place arch bridges in urban lakes are designed, reflecting the integration of humanity and the environment. In the construction of cast-in-place arch bridges on water, most of them adopt the method of backfilling water bodies. After the working surface is formed, the support adopts a full-height scaffolding system. The template is installed on the support system to complete the casting of the cast-in-place arch body. However, there is a large amount of backfilling and transportation of earth during the construction process, which can easily lead to water pollution and have certain limitations in terms of environmental protection. Due to the complexity of the arch-shaped cast-in-place bridge body, it is easy to produce unbalanced force during construction. The stability of conventional full-height scaffolding support is not easy to guarantee, which has certain hidden dangers in terms of safety. At the same time, the cofferdam, backfilling, cushion casting, and the subsequent cushion removal and earth transportation processes are added. The construction is slow and the efficiency is not high. Therefore, the existing cast-in-place arch bridge support system has certain limitations.

[0003] After searching, the Chinese patent publication number is: CN217579792 U, and the patent document with the publication date of October 14, 2022, discloses a support structure for the construction of a cast-in-place arch bridge across water, which includes a Bailey beam, a distribution beam, a construction platform and multiple pad beams. The Bailey beam is connected to the pad beam, the distribution beam is connected to the Bailey beam, and the construction platform is connected to the distribution beam. It also includes multiple vertical steel pipe columns, all of which are arranged side by side at intervals, and two adjacent vertical steel pipe columns are connected by a horizontal connecting frame, and the pad beam is connected to the vertical steel pipe column. When erecting the support structure for the construction of a cast-in-place arch bridge across water, it is only necessary to first fix the vertical steel pipe column to the bottom of the river or lake, and then erect the pad beam, Bailey beam, distribution beam, and construction platform from bottom to top. However, this support structure is relatively complex, and the height and curvature of the arch bridge are inconvenient to adjust. It needs to be installed accurately. If there is an error, rework may be required. Summary of the Invention

[0004] 1. Problems to be solved

[0005] In view of the problem that the construction of existing cast-in-situ arch bridges on water requires the erection of full-height scaffolding and construction platforms, resulting in a large amount of earth backfilling and transportation, which leads to water pollution, the present invention provides a support system for cast-in-situ arch bridges on water and a construction method thereof, which fully utilizes the grid structure of the entire support system itself to replace the full-height scaffolding, eliminates the need to backfill gravel soil into the water and pour a concrete cushion layer, is simple to operate and easy to implement, and can efficiently complete the erection of the cast-in-situ arch bridge support system.

[0006] 2. Technical solution

[0007] To solve the above problems, the present invention adopts the following technical solutions.

[0008] A support system for in-situ cast arch bridges on water, comprising an arch-shaped grid, two groups of cast-in-situ bored piles symmetrically arranged on the left and right at the bottom of the water, a bearing platform foundation fixed at the top of each group of cast-in-situ bored piles, and a pier fixed on the upper surface of the bearing platform foundation; a support frame body is also fixed on the bearing platform foundation inside each pier; both ends of the arch-shaped grid are respectively fixed on the upper surfaces of two symmetric support frame bodies, and the entire arch-shaped grid covers the water surface between the two support frame bodies; at least two rows of symmetric support bodies are vertically connected from the bottom surface of the arch-shaped grid to the bottom of the water; the support body includes a support combined frame body, a support platform and a steel pipe pile connected in sequence, and the bottom end of the steel pipe pile is inserted into the bottom of the water. During the construction process, the cast-in-situ bored piles can be fully utilized as the support foundation at both ends of the arch-shaped grid, the steel pipe piles as the support foundation in the middle of the arch-shaped grid, and the bearing platform foundation and the support platform as the construction platforms for construction workers to install and support both ends and the middle of the arch-shaped grid respectively, laying a foundation for the pouring of the in-situ cast concrete arch body. There is no need to backfill crushed stone soil and pour a concrete cushion into the water to facilitate the erection of a full hall scaffold and a construction platform. The operation is simple, easy to implement, and the erection of the support system for the in-situ cast arch bridge can be completed more efficiently, saving labor and ensuring quality.

[0009] As a further improvement of the technical solution, the support combined frame body is connected and combined by standard sections and lifting movable sections. Through the stacked connection and installation of the standard sections, the designed height of the arch-shaped grid is reached, and then the height is finely adjusted through the lifting movable sections. Even if there is an installation height error, corresponding adjustment can be made.

[0010] As a further improvement of the technical solution, the arch-shaped grid is connected and combined by an arc-shaped grid and grid connectors, and the entire arch-shaped grid is installed in a split manner, which saves labor in operation.

[0011] As a further improvement of the technical solution, an adjusting connecting rod is also connected between the support frame body and the arch-shaped grid, which can finely adjust the arch shape of the entire arch-shaped grid to improve the construction accuracy.

[0012] As a further improvement of the technical solution, the support combined frame body tightly abuts below the assembly splicing seam where the grid connectors are located, which is convenient for connecting two sections of the grid through the grid connectors during the construction process.

[0013] As a further improvement of the technical solution, the adjusting connecting rod is assembled by screwing two internal thread sleeves on a bidirectional reverse thread screw, and the two-way adjustment can improve the adjustment efficiency.

[0014] As a further improvement of the technical solution, an operation handle is radially connected to the middle of the bidirectional reverse thread screw, and the operation is convenient and labor-saving.

[0015] As a further improvement of the technical solution, the lifting movable section includes an outer frame body, a support frame, and a hydraulic lifting rod. The support frame is installed at the bottom of the outer frame body, the bottom of the hydraulic lifting rod is installed on the support frame, and the top of the hydraulic lifting rod is fixedly connected to the standard section, so as to ensure the installation and disassembly of the support combined frame body and ensure the stability of the frame body.

[0016] As a further improvement of the technical solution, distribution beams are evenly distributed and fixedly connected to the upper surface of the arch-shaped grid. The distribution beams and the arch-shaped grid form a vertical and horizontal cooperation to form a support surface for the formwork. A formwork is laid on the upper surface of the distribution beams to form a stable casting operation surface. After casting and forming concrete on the formwork, a cast-in-place concrete arch body is formed.

[0017] A construction method for a cast-in-place arch bridge on water, applying the above-mentioned support system for a cast-in-place arch bridge on water, the steps are as follows:

[0018] S1. Carry out cast-in-place bored piles, cap foundations, and abutments and piers construction in sequence from bottom to top;

[0019] S2. Position and set out the lines. After the support frame body 5 and the steel pipe piles 6 are installed, the adjusting connecting rods are installed on the support frame body, and the support platform is installed on the steel pipe piles;

[0020] S3. The standard sections are fixed on the support platform, and the standard sections are connected in a stacked manner to reach the designed height. An elevating movable section is connected between a pair of standard sections;

[0021] S4. Install the grid between the adjusting connecting rods and the support combined frame body; and complete the control of the arch radian and the appearance dimensions of the arch-shaped grid by adjusting the elevating movable section and the adjusting connecting rods;

[0022] S5. Complete the installation of the grid between two support combined frame bodies through grid connectors;

[0023] S6. Install distribution beams on the grid, and determine the distribution of the distribution beams according to force calculation;

[0024] S7. Install the formwork on the distribution beams. When installing the formwork, it should be installed symmetrically from both sides to the middle;

[0025] S8. Carry out the construction of the cast-in-place concrete arch body on the formwork. When pouring concrete, it should be poured symmetrically from both sides of the arch to ensure balanced force;

[0026] S9. After the cast-in-place concrete arch body is formed, remove the frame body of the support system. First, adjust the elevating movable section and the adjusting connecting rods to lower the frame body. After lowering one standard section, remove the distribution beams and the formwork. After completion, remove the grid, and finally remove the support frame body, the support platform, and the steel pipe piles to complete the removal of the support system.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) For the support system for in-situ cast arch bridges on water and its construction method of the present invention, when constructing, there is no need to backfill crushed stone soil and pour concrete cushion in water due to the erection of full hall scaffolding, which is safe and environmentally friendly. Moreover, the in-situ cast arch bridge support system has a simple structure and can be reused. All vertical steel pipe piles support the arched grid, and the arched grid is then longitudinally and horizontally connected with the distribution beams as a whole, ensuring the support stability and safety of the entire support structure, which is conducive to large-scale use;

[0030] (2) The present invention has an adjustable connecting rod, which can be adjusted according to different arches and has a wide range of applications;

[0031] (3) The lifting movable section provided in the present invention can ensure the installation and disassembly of the support combined frame body and ensure the stability of the frame body;

[0032] (4) The present invention is simple to operate and easy to implement, can complete the erection of the in-situ cast arch bridge support system more efficiently, saves labor employment, and ensures quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the support system for in-situ cast arch bridges on water in a specific embodiment of the present invention;

[0034] Figure 2 It is a front view of the support system for in-situ cast arch bridges on water in a specific embodiment of the present invention;

[0035] Figure 3 It is a construction schematic diagram of the steel pipe pile and the support platform in a specific embodiment of the present invention;

[0036] Figure 4 It is a construction schematic diagram of the support frame body and the support combined frame body in a specific embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of the grid installation in a specific embodiment of the present invention;

[0038] Figure 6 It is a schematic diagram of the distribution beam installation in a specific embodiment of the present invention;

[0039] Figure 7 It is a schematic diagram of the formwork installation in a specific embodiment of the present invention;

[0040] Figure 8 It is a schematic diagram of the adjustable connecting rod in a specific embodiment of the present invention;

[0041] Figure 9 It is a schematic diagram of the lifting movable section in a specific embodiment of the present invention.

[0042] In the figure: 1, cast-in-place bored pile; 2, pile cap foundation; 3, pier; 4, cast-in-place concrete arch body; 5, support frame body; 6, steel pipe pile; 7, support combined frame body; 8, grid; 9, water level line; 10, adjusting connecting rod; 11, standard section; 12, lifting movable section; 13, grid connecting piece; 14, support platform; 15, distribution beam; 16, formwork; 17, internal thread sleeve; 18, double-headed reverse thread screw rod; 19, operation handle; 20, support frame; 21, hydraulic lifting rod; 22, outer frame body. Specific implementation mode

[0043] The exemplary embodiments of the present invention are described in detail below. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments can be achieved and various changes can be made to the present invention without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed present invention, but is merely for illustrative purposes and does not limit the description of the features and characteristics of the present invention, in order to present the best mode of implementing the present invention and to be sufficient to enable those skilled in the art to implement the present invention. Therefore, the scope of the present invention is only defined by the appended claims.

[0044] Embodiment 1

[0045] A support system for a cast-in-place arch bridge on water in this embodiment is applied to the construction of a cast-in-place arch bridge on a certain river. As Figure 1 , 2 shown, it includes an arched grid, two groups of vertical cast-in-place bored piles 1 symmetrically arranged on the left and right at the bottom of the water, a pile cap foundation 2 fixed to the top of each group of cast-in-place bored piles 1, and a pier 3 fixed to the upper surface of the pile cap foundation 2; each group of cast-in-place bored piles 1 is generally an array of 2 rows of cast-in-place bored piles 1, and the pile cap foundation 2 and the pier 3 are both arranged symmetrically side by side and arranged along the river water flow direction; a support frame body 5 is also fixed on the pile cap foundation 2 inside each pier 3; the two ends of the arched grid are respectively fixed to the upper surfaces of two symmetric support frame bodies 5, and the pier 3 can be arranged in a convex shape to facilitate blocking the support frame body 5 and the arched grid, and the entire arched grid covers the water surface between the two support frame bodies 5; at least two rows of symmetric supports are vertically connected from the bottom surface of the arched grid to the bottom of the water; the support includes a support combined frame body 7, a support platform 14 and a steel pipe pile 6 connected in sequence, the bottom end of the steel pipe pile 6 is inserted into the bottom of the water, and the upper parts of the support platform 14 and the pile cap foundation 2 are both higher than the water level line 9 to facilitate the construction personnel to stand for installation.

[0046] A support system for cast-in-situ arch bridges on water in this embodiment can make full use of cast-in-situ bored piles 1 as the support foundation at both ends of the arch-shaped grid during construction, and steel pipe piles 6 as the support foundation in the middle of the arch-shaped grid. After the cap foundation 2 and the support platform 14 are used as the construction platforms for construction workers to install and support both ends and the middle of the arch-shaped grid respectively, it lays a foundation for the pouring of the cast-in-situ concrete arch body 4, and there is no need to backfill crushed stone soil and pour a concrete cushion into the water to facilitate the erection of a full hall scaffold and a construction platform. The operation is simple, easy to implement, can complete the erection of the support system for the cast-in-situ arch bridge more efficiently, save labor employment, and ensure quality.

[0047] Embodiment 2

[0048] A support system for cast-in-situ arch bridges on water in this embodiment has the same basic structure as that in Embodiment 1. The differences or improvements are as follows: As Figure 2 shown, the support combined frame 7 is connected and combined by standard sections 11 and lifting movable sections 12, generally in two rows. Through the stacked connection type installation of the standard sections 11, the designed height of the arch-shaped grid is reached, and then the height is finely adjusted through the lifting movable section 12. Even if there is an installation height error, corresponding adjustment can be made. As Figure 9 shown, the lifting movable section 12 includes an outer frame body 22, a support frame 20, and a hydraulic lifting rod 21. The support frame 20 is installed at the bottom of the outer frame body 22, the bottom of the hydraulic lifting rod 21 is installed on the support frame 20, and the top of the hydraulic lifting rod 21 is fixedly connected to the standard section 11; to ensure the installation and disassembly of the support combined frame 7 and ensure the stability of the frame.

[0049] The arch-shaped grid is arranged in multiple horizontal rows according to the lengths of the cap foundation (2) and the pier (3), Figure 5 、 6 In Figure 2 shown, the arch-shaped grid is connected and combined by an arc-shaped grid 8 and grid connectors 13. The grid connectors 13 can use bolts to install the entire arch-shaped grid in a split manner, which is labor-saving and does not require a large crane for hoisting. An adjustment connecting rod 10 is also connected between the support frame body 5 and the arch-shaped grid, which can finely adjust the arch shape of the entire arch-shaped grid to improve the construction accuracy. As Figure 8As shown in the figure, the adjusting connecting rod 10 is assembled by screwing two internal thread sleeves 17 onto the bidirectional reverse-thread screw rod 18, enabling two-way adjustment and improving the adjustment efficiency. An operating handle 19 is radially connected to the middle of the bidirectional reverse-thread screw rod 18, making the operation convenient and labor-saving. In specific applications, to make the adjustment of the arch more precise, multiple adjusting connecting rods 10 can be used. Since the connecting units of the grid 8 are generally triangular grids, adjusting connecting rods 10 can be connected to the connecting rods of each triangular grid to adjust the arch of the entire arched grid in three directions. Of course, three adjusting connecting rods 10 are also connected between the symmetric support frame bodies 5 on the opposite side and the arched grid, adjusting relatively from both sides to the middle. While improving the adjustment efficiency, the adjustment accuracy is also correspondingly improved. The support combined frame body 7 tightly abuts below the assembly splicing seam where the grid connector 13 is located, facilitating the connection of two sections of the grid 8 through the grid connector 13 during the construction process. The distribution beams 15 are evenly distributed and fixedly connected to the upper surface of the arched grid. The distribution beams 15 and the arched grid form a vertical and horizontal cooperation to form the support surface of the formwork 16. The formwork 16 is laid on the upper surface of the distribution beams 15 to form a stable casting operation surface. After pouring and forming concrete on the formwork 16, a cast-in-place concrete arch body 4 is formed.

[0050] A construction method for a cast-in-place arch bridge on water, applying the above-mentioned support system for a cast-in-place arch bridge on water, the steps are as follows:

[0051] S1. As Figure 1 , 3 shown, the cast-in-place bored piles 1, the caisson foundation 2, and the pier 3 are constructed successively from bottom to top;

[0052] S2. After positioning and setting out the lines, and installing the support frame body 5 and the steel pipe piles 6, the adjusting connecting rod 10 is installed on the support frame body 5. As Figure 3 shown, the support platform 14 is installed on the steel pipe piles 6;

[0053] S3. As Figure 4 shown, the standard sections 11 are fixed on the support platform 14, and the standard sections 11 are connected in a stacked manner to form the support combined frame body 7 until the design height is reached. An elevating movable section 12 is connected between a pair of standard sections 11;

[0054] S4. As Figure 2 shown, the grid 8 between the adjusting connecting rod 10 and the support combined frame body 7 is installed. During installation, starting from the adjusting connecting rod 10 and ending at the designed height above the water surface midline between two groups of cast-in-place bored piles 1, it is installed symmetrically; and by adjusting the elevating movable section 12 and the adjusting connecting rod 10, the arch radian and the appearance dimensions of the arched grid are controlled;

[0055] S5. As Figure 2 , 5As shown, the grid 8 is installed between the two support combined frameworks 7 through the grid connection member 13;

[0056] S6. As Figure 6 shown, the distribution beam 15 is installed on the grid 8, and according to the force calculation, the distribution of the distribution beam 15 is determined; the distribution beam 15 is evenly installed on the grid 8 to ensure balanced force;

[0057] S7. As Figure 7 shown, the formwork 16 is installed on the distribution beam 15. When installing the formwork 16, it should be installed symmetrically from both sides to the middle; the formwork 16 is installed on the distribution beam 15 to provide an operating space for the cast-in-place concrete arch body;

[0058] S8. The cast-in-place concrete arch body 4 is constructed with the formwork 16. When pouring the concrete, it should be poured symmetrically from both sides of the arch to ensure balanced force;

[0059] S9. After the cast-in-place concrete arch body 4 is formed, the framework of the support system is removed. First, the lifting and lowering movable joint 12 and the adjusting connecting rod 10 are adjusted to lower the framework. After lowering a standard section 11, the distribution beam 15 and the formwork 16 are removed. After completion, the grid 8 is removed, and finally the support framework 5, the support platform 14, and the steel pipe piles 6 are removed to complete the removal of the support system.

[0060] For the support system for the cast-in-place arch bridge on water and its construction method in this embodiment, when constructing, there is no need to backfill crushed stone soil and pour a concrete cushion into the water due to the erection of a full hall scaffold. Moreover, the entire support system has a simple structure, can be adjusted according to different arches, and the lifting and lowering movable joint can also ensure the installation and disassembly of the support combined framework to ensure the stability of the framework. All vertical steel pipe piles support the arched grid, and the arched grid is then longitudinally and transversely connected with the distribution beam as a whole to ensure the support stability and safety of the entire support structure. The arched radian can also be controlled through the lifting and lowering movable joint and the adjusting connecting rod to ensure the accurate appearance size of the cast-in-place arch bridge; after the bridge is completed and poured, the lifting and lowering movable joint 12 and the adjusting connecting rod 10 are adjusted to lower the framework. After lowering a standard section 11, the distribution beam 15 and the formwork 16 are removed. After completion, the grid 8 is removed, and finally the support framework 5, the support platform 14, and the steel pipe piles 6 are removed to complete the removal of the support system, and it can be reused, saving construction costs while being safe, environmentally friendly, and conducive to large-scale use.

Claims

1. A construction method for a support system of an in-situ cast arch bridge on water, characterized in that: The support system comprises an arched grid, two groups of cast-in-place piles (1) symmetrically arranged on the bottom of the water, a pedestal foundation (2) fixed to the top of each group of cast-in-place piles (1), and a pier (3) fixed to the upper surface of the pedestal foundation (2); a support frame (5) is also fixed on the pedestal foundation (2) inside each pier (3); the two ends of the arched grid are respectively fixed to the upper surfaces of the two symmetrical support frames (5), and the entire arched grid is covered on the water surface between the two support frames (5); at least two rows of symmetrical support bodies are vertically connected from the bottom surface of the arched grid to the bottom of the water; the support body comprises a support assembly frame (7), a support platform (14) and a steel pipe pile (6) connected in sequence, and the bottom end of the steel pipe pile (6) is inserted into the bottom of the water; The support assembly frame (7) is connected and assembled by a standard section (11) and a lifting movable section (12); The arched grid is formed by connecting and assembling an arc-shaped grid (8) and a grid connector (13); An adjustable connecting rod (10) is further connected between the support frame (5) and the arched grid; distribution beams (15) are evenly distributed and fixedly connected on the upper surface of the arched grid; a template (16) is laid on the upper surface of the distribution beam (15); concrete is poured on the template (16) and formed to form a cast-in-place concrete arch (4); The steps are: S1, constructing cast-in-place piles (1), cap foundation (2) and pier (3) in sequence from bottom to top; S2, positioning and laying out, after the support frame 5 and the steel pipe pile 6 are installed, the adjusting connecting rod (10) is installed on the support frame (5), and the supporting platform (14) is installed on the steel pipe pile (6); S3, the standard section (11) is fixed on the supporting platform (14), the standard sections (11) are stacked and connected to reach the designed height, and a lifting movable section (12) is connected between a pair of standard sections (11); S4, installing the grid (8) between the adjusting connecting rod (10) and the supporting assembly frame (7), and completing the curvature and external dimensions control of the arched grid by adjusting the lifting movable joint (12) and the adjusting connecting rod (10); S5, completing the installation of the grid (8) between the two support assembly frames (7) through the grid connector (13); S6. Install the distribution beam (15) on the grid (8), and determine the distribution of the distribution beam (15) based on the force calculation; S7, installing the template (16) on the distribution beam (15); S8, constructing the cast-in-place concrete arch (4) on the formwork (16); S9. After the cast-in-place concrete arch (4) is formed, the support system frame is dismantled. First, the frame is lowered by adjusting the lifting movable section (12) and the adjusting connecting rod (10). After lowering one standard section (11), the distribution beam (15) and the formwork (16) are dismantled. After completion, the grid (8) is dismantled, and finally the support frame (5), the support platform (14), and the steel pipe pile (6) are dismantled to complete the dismantling of the support system.

2. The construction method for the support system of the cast-in-situ arch bridge on water according to claim 1, characterized in that: The support assembly frame (7) is tightly pressed against the lower portion of the assembly joint where the grid connector (13) is located.

3. The construction method for the cast-in-situ arch bridge support system on water according to claim 1, characterized in that: The adjusting connecting rod (10) is assembled by screwing two internal thread sleeves (17) onto a bidirectional reverse thread screw rod (18).

4. The construction method for the support system of the cast-in-situ arch bridge on water according to claim 3, characterized in that: An operating handle (19) is radially connected to the middle of the bidirectional reverse thread screw rod (18).

5. The construction method for the in-situ cast arch bridge support system on water according to claim 3, characterized in that: The lifting movable section (12) includes an outer frame body (22), a support frame (20), and a hydraulic lifting rod (21). The support frame (20) is installed at the bottom of the outer frame body (22), the bottom of the hydraulic lifting rod (21) is installed on the support frame (20), and the top of the hydraulic lifting rod (21) is fixedly connected to the standard section (11).

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