Self-sealing formwork of UHPC component and construction method

Abstract

The invention discloses a self-sealing formwork of UHPC components and a construction method. The self-sealing formwork comprises two prefabricated UHPC components, and the two UHPC components are connected end to end to form a cylindrical UHPC shell; the UHPC component comprises an arc-shaped main body and a plurality of high-strength steel bars, the high-strength steel bars are evenly distributed in the axis direction of the main body, the two ends of each high-strength steel bar extend out of the two ends of the main body, an arc-shaped extension plate is arranged at one end of the main body, and the thickness of the arc-shaped extension plate is smaller than that of the main body. Wherein the main body of one UHPC component is connected with the arc-shaped extension plate of the other UHPC component, a protection plate is arranged at the joint of the main body and the arc-shaped extension plate, and meanwhile, the two high-strength steel bars, located on the same plane, of the two UHPC components are connected end to end to form a high-strength steel bar ring. The UHPC components can be quickly connected, the problems in the prior art are solved, the construction efficiency and durability of the whole structure are improved, and technical support is provided for application of UHPC in more fields.

Description

Technical Field

[0001] The invention relates to a building structure reinforcement technology, and in particular to a self-enclosed formwork for a UHPC component and a construction method. Background Art

[0002] Ultra-high performance concrete (UHPC) is a new type of building material with excellent mechanical properties and durability. In recent years, UHPC has been widely studied and applied in the fields of bridge engineering, building structures, and protective engineering. With the continuous development of UHPC materials, how to effectively apply it to structures and achieve fast and reliable connections has become the focus of the engineering community.

[0003] In terms of connection technology, existing patents have proposed a variety of quick connection devices, such as a quick plug-in connection device, which can achieve quick connection and separation through the relative movement of two connectors, and is easy to operate. Another patent proposes a quick connection structure for the bridge deck system of a widened bridge using UHPC materials, by reserving transverse steel bars on the bridge deck at the splicing position of the new and old bridge superstructures, welding the steel bars in the wet joints on site, and pouring UHPC concrete in the wet joints to complete the connection.

[0004] However, the existing connection methods still have some shortcomings, such as complex construction, insufficient durability, and a long time. Summary of the invention

[0005] The first purpose of the present invention is to overcome the deficiencies of the above prior art and provide a self-enclosed formwork for UHPC components. The self-enclosed formwork for UHPC components has better connection effect and construction speed, allowing it to be used in a wider range of application scenarios.

[0006] The second object of the present invention is to provide a construction method of a self-enclosed formwork based on UHPC components.

[0007] The object of the present invention is achieved through the following technical scheme: the self-enclosed formwork of the UHPC component comprises two prefabricated UHPC components, and the two UHPC components are connected end to end to form a cylindrical UHPC shell; the UHPC component comprises an arc-shaped main body and a plurality of high-strength steel bars, the plurality of high-strength steel bars are evenly distributed along the axial direction of the main body, and both ends of all the high-strength steel bars extend out of both ends of the main body, and one end of the main body is provided with an arc-shaped extension plate, and the thickness of the arc-shaped extension plate is less than the thickness of the main body; the main body in one UHPC component is connected to the arc-shaped extension plate in another UHPC component, and a guard plate is provided at the connection between the main body and the arc-shaped extension plate, and at the same time, two high-strength steel bars located in the same plane in the two UHPC components are connected end to end to form a high-strength steel bar ring.

[0008] Preferably, the inner sides of the main body and the arc-shaped extension plate are provided with rough side surfaces roughened by high-pressure water gun.

[0009] Preferably, the main body in one UHPC component and the arc-shaped extension plate in another UHPC component are connected by a modified acrylic adhesive.

[0010] Preferably, a plurality of high-strength steel bars are arranged in parallel.

[0011] Preferably, the length of the portion of each high-strength steel bar extending out of the main body is greater than the arc length of the arc-shaped extension plate.

[0012] The construction method of the self-enclosed formwork of the UHPC component according to the first purpose comprises the following steps:

[0013] S1. Determine the size of the column to be reinforced;

[0014] S2. Prefabricate the UHPC components in the factory based on the size of the columns to be reinforced;

[0015] S3. Splice two UHPC components on the outside of the column, and connect the two high-strength steel bars located in the same plane between the two UHPC components end to end;

[0016] S4. The two UHPC components are connected by a modified acrylic adhesive and a wooden board is fixed on the outside. Then, the two UHPC components and the wooden board form a receiving cavity, and the column is located in the receiving cavity.

[0017] S5. Inject UHPC slurry into the accommodating cavity, and reinforce the column after the UHPC slurry solidifies.

[0018] Preferably, in step S1, if the column to be reinforced is a square column, the square column is chamfered.

[0019] The present invention has the following advantages over the prior art:

[0020] The self-enclosed formwork of the UHPC component in the present invention is composed of two prefabricated UHPC components, wherein the UHPC component includes an arc-shaped main body and a plurality of high-strength steel bars. The UHPC components are connected by the main body and the arc-shaped extension plate, and the high-strength steel bars of the two can be quickly overlapped, so that the UHPC components can be quickly connected, which solves the problems in the prior art, improves the construction efficiency and durability of the overall structure, and provides technical support for the application of UHPC in more fields. The self-enclosed formwork of the UHPC component of the present invention can not only meet the various functional requirements of building use, but also has the advantages of convenient design and construction. It can implement a standardized operation mode of column reinforcement under various common situations, and the self-formed formwork system is convenient, fast, simple and efficient. The construction method of the present invention is implemented based on the self-enclosed formwork of the UHPC component of the present invention, which can not only meet the various functional requirements of various column uses, but also has the advantages of convenient design and construction. It is a preferred form of temporary or emergency structure and an important link in the development of sustainable building structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the self-enclosed formwork of the UHPC component of the present invention.

[0022] Figure 2 It is a front view of the self-enclosed formwork of the UHPC component of the present invention.

[0023] Figure 3 It is a schematic structural diagram of the UHPC component of the present invention.

[0024] Figure 4 It is a construction flow chart of the present invention.

[0025] Among them, 1 is the UHPC component, 2 is the main body, 3 is the high-strength steel bar, 4 is the curved extension plate, 5 is the guard plate, 6 is the modified acrylic adhesive, 7 is the rough side, 8 is the UHPC slurry, and 9 is the column. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] like Figures 1 to 3As shown, the self-enclosed formwork of the UHPC component includes two prefabricated UHPC components, which are connected end to end to form a cylindrical UHPC shell; the UHPC component includes an arc-shaped main body and a plurality of high-strength steel bars, which are evenly distributed along the axis direction of the main body and are arranged in parallel. Both ends of all high-strength steel bars extend out of both ends of the main body, and one end of the main body is provided with an arc-shaped extension plate, the thickness of which is less than the thickness of the main body; the main body in one UHPC component is connected to the arc-shaped extension plate in another UHPC component, and a guard plate is provided at the connection between the main body and the arc-shaped extension plate, and at the same time, the two high-strength steel bars in the two UHPC components located in the same plane are connected end to end to form a high-strength steel bar ring.

[0028] Specifically, the thickness of the main body is greater than the thickness of the arc-shaped extension plate. Both the main body and the arc-shaped extension plate are made of UHPC. When the two are connected together in a semi-ring shape, a cylindrical UHPC shell can be formed after the two UHPC components are connected end to end, and there is a gap between the two main bodies. The ends of the two high-strength steel bars on the same horizontal plane are overlapped to achieve quick connection. The overlap between the two high-strength steel bars is located directly inside the arc-shaped extension plate, that is, there is a gap between the two main bodies, which makes the entire structure compact.

[0029] The inner sides of the main body and the arc-shaped extension plate are provided with rough side surfaces formed by roughening with a high-pressure water gun. The rough side surfaces ensure the connection strength with the subsequently injected UHPC slurry and further improve the curing effect.

[0030] The main body of one UHPC component and the arc-shaped extension plate of another UHPC component are connected by modified acrylic adhesive. This connection is stable and cooperates with the guard plate to prevent the subsequent overflow of UHPC slurry and ensure the effective implementation.

[0031] The length of each high-strength steel bar extending out of the main body is greater than the arc length of the arc extension plate. That is, the sum of the lengths of both ends of each high-strength steel bar extending out of the main body is greater than the length of the arc extension plate. This setting ensures that the two high-strength steel bars on the same horizontal plane have sufficient overlap length to protect the stability of the connection.

[0032] like Figure 4 As shown, the construction method of the self-enclosed formwork of the UHPC component based on the first purpose comprises the following steps:

[0033] S1. Determine the size of the column to be reinforced; if the column to be reinforced is a square column, chamfer the square column, that is, determine the parameters of the prefabricated UHPC component based on the size of the column to be reinforced;

[0034] S2. Prefabricate the UHPC components in the factory based on the size of the columns to be reinforced;

[0035] S3. Splice two UHPC components on the outside of the column, and connect the two high-strength steel bars located in the same plane between the two UHPC components end to end;

[0036] S4. The two UHPC components are connected by a modified acrylic adhesive and a wooden board is fixed on the outside. Then, the two UHPC components and the wooden board form a receiving cavity, and the column is located in the receiving cavity.

[0037] S5. Inject UHPC slurry into the accommodating cavity, and reinforce the column after the UHPC slurry solidifies.

[0038] The present invention adopts the self-enclosed formwork and construction method of the above-mentioned UHPC components, which can not only meet various functional requirements of building use, but also have the advantages of convenient design and construction, and can implement standardized operation modes for column reinforcement in various common situations. The self-contained formwork system is convenient, fast, simple and efficient.

[0039] The above specific implementation modes are preferred embodiments of the present invention and cannot be used to limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. Self-enclosed formwork for UHPC components, characterized in that: The invention comprises two prefabricated UHPC components, which are connected end to end to form a cylindrical UHPC shell; the UHPC component comprises an arc-shaped main body and a plurality of high-strength steel bars, the plurality of high-strength steel bars are evenly distributed along the axial direction of the main body, and both ends of all the high-strength steel bars extend out of both ends of the main body, one end of the main body is provided with an arc-shaped extension plate, the thickness of the arc-shaped extension plate is less than the thickness of the main body; the main body in one UHPC component is connected to the arc-shaped extension plate in the other UHPC component, and a guard plate is provided at the connection between the main body and the arc-shaped extension plate, and at the same time, two high-strength steel bars located in the same plane in the two UHPC components are connected end to end to form a high-strength steel bar ring.

2. The self-enclosed formwork for UHPC components according to claim 1, characterized in that: The inner sides of the main body and the arc-shaped extension plate are provided with rough side surfaces formed by roughening with a high-pressure water gun.

3. The self-enclosed formwork for UHPC components according to claim 1, characterized in that: The main body in one of the UHPC components and the arc-shaped extension plate in the other UHPC component are connected by a modified acrylic adhesive.

4. The self-enclosed formwork for UHPC components according to claim 3, characterized in that: Multiple high-strength steel bars are arranged in parallel.

5. The self-enclosed formwork for UHPC components according to claim 1, characterized in that: The length of the portion of each high-strength steel bar extending out of the main body is greater than the arc length of the arc-shaped extension plate.

6. A construction method for a self-enclosed formwork for a UHPC component according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Determine the size of the column to be reinforced; S2. Prefabricate the UHPC components in the factory based on the size of the columns to be reinforced; S3. Splice two UHPC components on the outside of the column, and connect the two high-strength steel bars located in the same plane between the two UHPC components end to end; S4. The two UHPC components are connected by a modified acrylic adhesive and a wooden board is fixed on the outside. Then, the two UHPC components and the wooden board form a receiving cavity, and the column is located in the receiving cavity. S5. Inject UHPC slurry into the accommodating cavity, and reinforce the column after the UHPC slurry solidifies.

7. The construction method of the self-enclosed formwork of the UHPC component according to claim 6, characterized in that: In step S1, if the column to be reinforced is a square column, the square column is chamfered.

Images