Steel casing system for reinforcing pile foundation of underwater high pile cap and reinforcing method

Abstract

The invention relates to the technical field of underwater construction, in particular to an underwater high pile cap pile foundation reinforcing steel casing system and a reinforcing method.The underwater high pile cap pile foundation reinforcing steel casing system comprises a formwork system, a fixing system, a sealing system and a pouring system, the formwork system comprises two semicircular steel casings and a connecting assembly, the fixing system comprises embedded steel bars and two semicircular reinforcing meshes, and the sealing system comprises a sealing system and a pouring system; the sealing system comprises a steel casing bottom plate, the pouring system comprises a guide pipe and a pipeline communicating vessel, embedded steel bars are driven into the side wall of the underwater pile foundation, the two semicircular reinforcing meshes are installed on the two sides of the pile foundation, the two semicircular steel casings are folded at the pile foundation, and the steel casing bottom plate is installed at the bottoms of the two semicircular steel casings. The pipeline communicating vessel is installed on the side wall of the semicircular steel casing, the guide pipe is connected with the pipeline communicating vessel in the construction process, and concrete is poured into the guide pipe, and the effects of being low in construction cost, short in construction period, small in construction difficulty and small in construction risk can be achieved in the pile foundation reinforcing process of bridge repair engineering.

Description

Technical Field

[0001] The invention relates to the technical field of underwater construction, in particular to a steel casing system for reinforcing a pile foundation of an underwater high pile cap and a reinforcement method. Background Art

[0002] In the construction of expanding the cross-section of the pile foundation of a bridge, the commonly used method is to lower a steel casing and a steel cage with a larger diameter than the original pile foundation, and finally pour reinforced concrete to complete the pile foundation reinforcement construction. However, in the pile foundation reinforcement construction of the bridge repair project, due to the existence of the bridge itself The foundation structure and the pile foundation to be processed are located underwater, the steel casing and the steel cage cannot be lowered to the pile foundation to be reinforced by conventional means. In addition, the cofferdam method can be used to make the original pile foundation have a space that is convenient for construction, but the cost of using the cofferdam method is high and the safety risk is high. For this reason, it is urgent to propose a steel casing system and reinforcement method for the underwater high pile foundation reinforcement to take into account the construction difficulty and construction cost of the pile foundation reinforcement in the bridge repair project. Summary of the invention

[0003] In order to achieve the effects of low construction cost, short construction period, low construction difficulty and low construction risk in the pile foundation reinforcement process of bridge repair projects, the present application provides a steel casing system and reinforcement method for pile foundation reinforcement of underwater high pile caps.

[0004] In the first aspect, the present invention provides a steel casing system for reinforcing a pile foundation of an underwater high pile cap, which adopts the following technical solution:

[0005] A steel casing system for reinforcing the foundation of an underwater high pile cap comprises a template system, a fixing system, a sealing system and a pouring system, wherein the template system comprises two semicircular steel casings and a connecting assembly connecting the two semicircular steel casings, the fixing system comprises anchor bars and two semicircular steel meshes, the sealing system comprises a steel casing bottom plate, and the pouring system comprises a conduit and a pipe connector, the anchor bars are driven into the side walls of an underwater pile foundation, the two semicircular steel meshes are installed on both sides of the pile foundation by being connected to the anchor bars, the two semicircular steel casings are closed at the pile foundation, the steel casing bottom plate is installed at the bottoms of the two semicircular steel casings, the pipe connector is installed on the side wall of one of the semicircular steel casings, and the conduit is connected to the pipe connector during construction and poured with concrete.

[0006] Preferably, two groups of connecting components are provided between the two semicircular steel casings, and the two groups of connecting components are respectively arranged at two closed places of the two semicircular steel casings. The connecting components include connecting buckles, water-stopping rubbers, flanges and flange bolts. Each group of connecting buckles, water-stopping rubbers and flanges of the connecting components is provided with two. The two connecting buckles are respectively fixed on the edges of the two semicircular steel casings, the two flanges are respectively connected to the two connecting buckles, the two water-stopping rubbers are respectively padded between the two flanges and the connecting buckles, and the flange bolts are connected between the two flanges.

[0007] Preferably, two pipe communicators are provided, and the two pipe communicators are respectively a bottom-sealed concrete pipe communicator and a reinforced concrete pipe communicator, and the two pipe communicators are distributed up and down, with the reinforced concrete pipe communicator located at the top and the bottom-sealed concrete pipe communicator located at the bottom, and the conduit is sequentially connected to the bottom-sealed concrete pipe communicator and the reinforced concrete pipe communicator during the construction process, and when the conduit is connected to the bottom-sealed concrete pipe communicator, the conduit pours bottom-sealed concrete into the steel casing, and when the conduit is connected to the reinforced concrete pipe communicator, the conduit pours reinforced concrete into the steel casing.

[0008] Preferably, the sealing system further comprises a stop valve, and the stop valve is arranged in the bottom sealed concrete pipe communicating vessel.

[0009] Preferably, reinforcing steel bars are connected between the two pipe connectors and the semicircular steel casing.

[0010] In a first aspect, the present invention provides a method for reinforcing a pile foundation of an underwater high pile cap, which adopts the following technical solution:

[0011] A method for reinforcing a pile foundation of an underwater high pile cap comprises the following steps:

[0012] S1: Processing the semicircular steel mesh and the semicircular steel casing in a land processing plant;

[0013] S2: driving the rebar into the side wall of the pile foundation underwater;

[0014] S3: installing the two semicircular steel meshes on both sides of the pile foundation and fixing them on the embedded steel bars;

[0015] S4: installing the steel casing bottom plates at the bottoms of the two semicircular steel casings respectively, and then lowering the two semicircular steel casings to both sides of the pile foundation and closing them;

[0016] S5: connecting the conduit to the bottom sealing concrete pipe connector and pouring bottom sealing concrete;

[0017] S6: closing the stop valve of the bottom-sealed concrete pipe communicant, separating the conduit from the bottom-sealed concrete pipe communicant, connecting the conduit to the reinforced concrete pipe communicant, and pouring reinforced concrete;

[0018] S7: After the pouring is completed, the catheter and the semicircular steel casing are removed.

[0019] Preferably, before the steel casing is lowered into the pile foundation and closed, the silt at the bottom of the riverbed needs to be cleaned.

[0020] Preferably, in S5 and S6, the reinforcing concrete is poured after the bottom sealing concrete to be poured solidifies and reaches the structural strength.

[0021] Preferably, in S2 and S3, the construction workers who carry out the planting of the rebar and the installation of the semicircular steel mesh underwater are divers, and a crawler crane or a floating crane on a working platform is required to lower the semicircular steel mesh; in S4, the construction workers who close the semicircular steel casing underwater are divers, and the semicircular steel casing is lowered by a crane and closed with the assistance of a diver; in S5 and S6, the construction workers who connect the conduit underwater are divers, and the lowering and transfer of the conduit are carried out by a crane.

[0022] Preferably, in S5 and S6, the bottom sealing concrete is selected from concrete with a strength grade of C25 to C30, and the reinforcing concrete is selected from concrete with a strength grade of C30 or above.

[0023] The beneficial effects of the present invention are:

[0024] In the present invention, by splitting the complete steel casing into two semicircular steel casings, and assembling the two semicircular steel casings after installing the embedded bars and the steel mesh at the underwater pile foundation, the problem that the traditional steel casing cannot be lowered to the underwater pile foundation during the bridge repair process can be solved, avoiding the need to use the cofferdam method for underwater pile foundation reinforcement construction, and by arranging a pipe connector and a connecting conduit on the side wall of one of the semicircular steel casings, it can be quickly poured into the pile foundation, thereby achieving the effects of low construction cost, short construction period, low construction difficulty and low construction risk in the pile foundation reinforcement process of the bridge repair project. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a top view of two semicircular steel casings in an embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of the structure of the implanted reinforcement in the embodiment of the present application;

[0027] Figure 3 It is a schematic diagram of the structure of two semicircular steel meshes in an embodiment of the present application;

[0028] Figure 4 is a side view of two semicircular steel casings in an embodiment of the present application;

[0029] Figure 5 Schematic diagram of pouring concrete into the bottom-sealed concrete pipe connector in the embodiment of the present application;

[0030] Figure 6 It is a schematic diagram of pouring concrete into the reinforced concrete pipe connector in the embodiment of the present application.

[0031] Explanation of the reference numerals in the accompanying drawings: 1. Semicircular steel casing; 2. Connecting buckle; 3. Water-stop rubber; 4. Flange; 5. Flange bolt; 6. Semicircular steel mesh; 7. Embedded reinforcement; 8. Steel casing bottom plate; 9. Stop valve; 10. Bottom-sealed concrete pipe connector; 11. Reinforced concrete pipe connector; 12. Conduit; 13. Reinforced steel bars. DETAILED DESCRIPTION

[0032] The following will be combined Figure 1-Figure 6 The present invention is further illustrated by the following embodiments.

[0033] This embodiment discloses a steel casing system for reinforcing a pile foundation of an underwater high pile cap.

[0034] The steel casing system for reinforcing the foundation of the underwater high pile cap includes a template system, a fixing system, a sealing system and a pouring system. The template system includes two semicircular steel casings 1 and a connecting assembly for connecting the two semicircular steel casings 1, the fixing system includes anchor bars 7 and two semicircular steel meshes 6, the sealing system includes a steel casing bottom plate 8, and the pouring system includes a conduit 12 and a pipe connector. Among them, the anchor bars 7 are driven into the side walls of the underwater pile foundation, and the two semicircular steel meshes 6 are installed on both sides of the pile foundation by connecting with the anchor bars 7. The two semicircular steel casings 1 are closed at the pile foundation, and the steel casing bottom plate 8 is installed at the bottom of the two semicircular steel casings 1. In this embodiment, the steel casing bottom plate 8 is divided into two semicircular ring bottom plates. The pipe connector is installed on the side wall of one of the semicircular steel casings 1 and is connected to the interior of the semicircular steel casing 1. The conduit 12 is connected to the pipe connector during the construction process and poured with concrete. After the concrete is poured, the mass density of the concrete itself will discharge the water in the steel casing until the concrete solidifies. Finally, the concrete, steel cage, and embedded rebar 7 have a reinforcement effect on the underwater pile foundation. The steel casing is disassembled after the construction is completed.

[0035] In the present invention, by splitting the complete steel casing into two semicircular steel casings 1, and assembling the two semicircular steel casings 1 after installing the embedded steel bars 7 and the steel mesh at the underwater pile foundation, the problem that the traditional steel casing cannot be lowered to the underwater pile foundation during the bridge repair process can be solved, avoiding the need to use the cofferdam method for underwater pile foundation reinforcement construction, and by arranging a pipe connector and a connecting conduit 12 on the side wall of one of the semicircular steel casings 1, it can be quickly poured into the pile foundation, thereby achieving the effects of low construction cost, short construction period, low construction difficulty and low construction risk in the pile foundation reinforcement process of the bridge repair project.

[0036] There are two groups of connection components between the two semicircular steel casings 1, and the two groups of connection components are respectively arranged at two folded places of the two semicircular steel casings 1. The connection components include connection buckles 2, water-stop rubbers 3, flanges 4 and flange bolts 5. Each group of connection buckles 2, water-stop rubbers 3 and flanges 4 are provided with two, and the two connection buckles 2 are respectively fixed on the edges of the two semicircular steel casings 1, and the two flanges 4 are respectively connected to the two connection buckles 2. The two water-stop rubbers 3 are respectively cushioned between the two flanges 4 and the connection buckles 2, and the flange bolts 5 are connected between the two flanges 4. Through the connection component, the two semicircular steel casings 1 can be quickly disassembled and assembled.

[0037] One of the semicircular steel casings 1 has two pipe connectors, which are a bottom concrete pipe connector 10 and a reinforced concrete pipe connector 11. The two pipe connectors are arranged up and down, with the reinforced concrete pipe connector 11 located at the top and the bottom concrete pipe connector 10 located at the bottom. During the construction process, the conduit 12 sequentially connects the bottom concrete pipe connector 10 and the reinforced concrete pipe connector 11. When the conduit 12 is connected to the bottom concrete pipe connector 10, the conduit 12 pours the bottom concrete into the steel casing. When the conduit 12 is connected to the reinforced concrete pipe connector 11, the conduit 12 pours the reinforced concrete into the steel casing. The sealing system also includes a stop valve 9, which is arranged in the bottom concrete pipe connector 10 to prevent the bottom concrete poured into the steel casing from flowing back into the conduit 12 when the conduit 12 switches the connection position.

[0038] Reinforcement steel bars 13 are connected between the two pipe manifolds and the semicircular steel casing 1 , and the reinforcement steel bars 13 are used to improve the connection stability between the pipe manifolds and the semicircular steel casing 1 .

[0039] This embodiment discloses a method for reinforcing a pile foundation of an underwater high pile cap.

[0040] The method for reinforcing the pile foundation of an underwater high pile cap comprises the following steps:

[0041] S1: Processing the semicircular steel mesh 6 and the semicircular steel casing 1 in a land processing plant;

[0042] S2: driving the rebar 7 into the side wall of the pile foundation underwater;

[0043] S3: Install two semicircular steel meshes 6 on both sides of the pile foundation and fix them on the embedded steel bars 7;

[0044] S4: installing steel casing bottom plates 8 at the bottom of the two semicircular steel casings 1 respectively, and then lowering the two semicircular steel casings 1 to both sides of the pile foundation and closing them;

[0045] S5: Connect the conduit 12 to the bottom concrete pipe connector 10, pour the bottom concrete, and the bottom concrete uses its own mass and density to discharge the water in the steel casing;

[0046] S6: Close the stop valve 9 of the bottom-sealed concrete pipe communication device 10, separate the conduit 12 from the bottom-sealed concrete pipe communication device 10, and connect the conduit 12 to the reinforced concrete pipe communication device 11, pour the reinforced concrete, and the reinforced concrete uses its own mass and density to discharge the water in the steel casing;

[0047] S7: After the filling is completed, the catheter 12 and the semicircular steel casing 1 are removed.

[0048] In S2 and S3, the construction workers who install the rebar 7 and the semicircular steel mesh 6 underwater are divers, and the crawler crane or floating crane on the working platform is needed to lower the semicircular steel mesh 6, so as to realize the process of installing the rebar 7 and the semicircular steel mesh 6 to the side wall of the pile foundation underwater. In S4, the construction workers who close the semicircular steel casing 1 underwater are also divers, and the semicircular steel casing 1 is lowered by a crane and assisted by divers to close it. In S5 and S6, the construction workers who connect the conduit 12 underwater are also divers, and the lowering and transfer of the conduit 12 are also carried out by a crane.

[0049] Before lowering the steel casing to the underwater pile foundation and closing it, the silt at the bottom of the riverbed needs to be cleaned. The silt is soft and highly fluid. If it is not cleaned, the steel casing may tilt or sink unevenly due to unstable foundation, affecting its accurate positioning. Cleaning the silt allows the steel casing to better contact the hard riverbed or soil, thus ensuring that it is stably fixed in the correct position.

[0050] In S5 and S6, the reinforcing concrete should be poured after the poured bottom concrete solidifies and reaches the structural strength, so as to avoid mixing of the two concretes and deformation of the bottom concrete.

[0051] In this embodiment, the bottom sealing concrete is selected from concrete with a strength grade of C25 to C30, and the reinforcing concrete is selected from concrete with a strength grade of C30 or above.

[0052] The above are all preferred embodiments of the present invention, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A steel casing system for reinforcing the foundation of a high pile cap in water, characterized by: The invention comprises a template system, a fixing system, a sealing system and a pouring system. The template system comprises two semicircular steel casings (1) and a connecting assembly connecting the two semicircular steel casings (1). The fixing system comprises a rebar (7) and two semicircular steel meshes (6). The sealing system comprises a steel casing bottom plate (8). The pouring system comprises a conduit (12) and a pipe connector. The rebar (7) is driven into the side wall of an underwater pile foundation. The two semicircular steel meshes (6) are installed on both sides of the pile foundation by connecting with the rebar (7). The two semicircular steel casings (1) are closed at the pile foundation. The steel casing bottom plate (8) is installed at the bottom of the two semicircular steel casings (1). The pipe connector is installed on the side wall of one of the semicircular steel casings (1). The conduit (12) is connected to the pipe connector during construction and poured with concrete.

2. The steel casing system for reinforcing the pile foundation of an underwater high pile cap according to claim 1 is characterized by: Two groups of connection components are provided between the two semicircular steel casings (1), and the two groups of connection components are respectively arranged at two folded places of the two semicircular steel casings (1). The connection components include connection buckles (2), waterproof rubbers (3), flanges (4) and flange bolts (5). Each group of connection buckles (2), waterproof rubbers (3) and flanges (4) of the connection components is provided with two. The two connection buckles (2) are respectively fixedly provided on the edges of the two semicircular steel casings (1), the two flanges (4) are respectively connected to the two connection buckles (2), the two waterproof rubbers (3) are respectively padded between the two flanges (4) and the connection buckles (2), and the flange bolts (5) are connected between the two flanges (4).

3. The steel casing system for reinforcing the pile foundation of an underwater high pile cap according to claim 2 is characterized by: The two pipe communicators are provided with two, and the two pipe communicators are respectively a bottom-sealed concrete pipe communicator (10) and a reinforced concrete pipe communicator (11). The two pipe communicators are arranged up and down, and the reinforced concrete pipe communicator (11) is located at the top and the bottom-sealed concrete pipe communicator (10) is located at the bottom. The conduit (12) is sequentially connected to the bottom-sealed concrete pipe communicator (10) and the reinforced concrete pipe communicator (11) during the construction process. When the conduit (12) is connected to the bottom-sealed concrete pipe communicator (10), the conduit (12) pours bottom-sealed concrete into the steel casing. When the conduit (12) is connected to the reinforced concrete pipe communicator (11), the conduit (12) pours reinforced concrete into the steel casing.

4. The steel casing system for reinforcing the pile foundation of an underwater high pile cap according to claim 3 is characterized by: The sealing system further comprises a stop valve (9), wherein the stop valve (9) is arranged in the bottom-sealed concrete pipe communicating vessel (10).

5. The steel casing system for reinforcing the pile foundation of an underwater high pile cap according to claim 4 is characterized by: Reinforcement steel bars (13) are connected between the two pipeline connectors and the semicircular steel casing.

6. A method for reinforcing a pile foundation of an underwater high pile cap, based on the underwater high pile cap pile foundation reinforcement steel casing system as claimed in claim 5, characterized in that: The following steps are involved: S1: Processing the semicircular steel mesh (6) and the semicircular steel casing (1) in a land processing plant; S2: driving the embedded reinforcement (7) into the side wall of the pile foundation underwater; S3: installing the two semicircular steel meshes (6) on both sides of the pile foundation respectively and fixing them on the embedded steel bars (7); S4: installing the steel casing bottom plates (8) at the bottoms of the two semicircular steel casings (1) respectively, and then lowering the two semicircular steel casings (1) to both sides of the pile foundation and closing them; S5: connecting the conduit (12) to the bottom sealing concrete pipe connector (10), and pouring bottom sealing concrete; S6: closing the stop valve (9) of the bottom-sealed concrete pipe communicator (10), separating the conduit (12) from the bottom-sealed concrete pipe communicator (10), connecting the conduit (12) to the reinforced concrete pipe communicator (11), and pouring reinforced concrete; S7: After the perfusion is completed, the catheter (12) and the semicircular steel casing (1) are removed.

7. The steel casing system for reinforcing the pile foundation of an underwater high pile cap according to claim 6 is characterized by: Before the steel casing is lowered into the pile foundation and closed, the silt at the bottom of the riverbed needs to be cleaned.

8. The steel casing system for reinforcing the pile foundation of an underwater high pile cap according to claim 7 is characterized by: In S5 and S6, the reinforcing concrete is poured after the poured bottom concrete solidifies and reaches the structural strength.

9. The steel casing system for reinforcing the pile foundation of an underwater high pile cap according to claim 8, characterized in that: In S2 and S3, the construction workers who carry out the installation of the embedded steel bars (7) and the semicircular steel mesh (6) underwater are divers, and the crawler crane or floating crane on the working platform is required to lower the semicircular steel mesh (6); in S4, the construction workers who carry out the closing of the semicircular steel casing (1) underwater are divers, and the semicircular steel casing (1) is lowered by a crane and assisted by the diver in closing; in S5 and S6, the construction workers who carry out the connection of the conduit (12) underwater are divers, and the lowering and transfer of the conduit (12) are carried out by a crane.

10. The steel casing system for reinforcing the pile foundation of an underwater high pile cap according to claim 9, characterized in that: In S5 and S6, the bottom sealing concrete shall be of strength grade C25 to C30, and the reinforcing concrete shall be of strength grade C30 and above.

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