Bridge profile steel expansion joint maintenance construction method based on novel formwork system

Abstract

The invention discloses a bridge section steel expansion joint maintenance construction method based on a novel formwork system, and particularly relates to the technical field of bridge section steel expansion joint maintenance construction, and the method comprises the following steps: S1, preparation before construction, S2, on-site construction, and S3, construction summarization. When a traditional profile steel expansion joint is maintained and constructed, (1) flexible materials such as foam plates and cloth which are low in strength and not easy to fix are adopted to fill the joint and support concrete, the concrete in the expansion joint is easy to expand, leak slurry, block and pollute a lower bridge structure, and the working performance of free expansion of the structure is influenced; and (2) the gaps and the retaining concrete are filled with battens or square timbers, so that the installation difficulty is high, the formwork is easy to deviate, and the difficulty of taking out the gap filling material in the later period is high. According to the method, the maintenance construction method that a traditional joint filling material is replaced with the rail inner supporting type aluminum formwork system is adopted, operation is easy, the construction speed is high, precision is high, the side face structure size of the post-cast strip joint can be accurately controlled, and the phenomena of concrete formwork expansion and slurry leakage are eliminated; by changing the specifications of the self-sealing turn buckles, the formwork system can be suitable for construction of various types of profile steel expansion joint structures; meanwhile, in the construction process, through combination of the formwork and the horizontal laser instrument, a traditional rough construction method for controlling the profile steel and concrete surface elevation and flatness is changed, and the overall maintenance construction quality of the profile steel expansion joint structure is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge steel expansion joint maintenance construction, and more specifically, to a bridge steel expansion joint maintenance construction method based on a novel template system. Background Art

[0002] The steel expansion joint of a bridge is an important part of the bridge structure and is easily damaged. There are several main reasons: the concrete strength of the concrete anchor belt of the steel expansion joint is insufficient, and the reinforcement is insufficient, which leads to cracking on the surface of the concrete anchor belt, exposed steel bars, and in severe cases, the anchor belt is broken as a whole; the side beams of the steel expansion joint are deformed and broken by the impact of vehicle loads; the connection between the side beam anchor and the embedded structural reinforcement is not firm, resulting in loose steel; foreign objects in the expansion joint hinder structural deformation, and structural stress causes deformation of the expansion joint device; foreign objects in the expansion joint device are not cleaned in time, and are crushed by vehicles, puncturing the rubber waterstop, causing leakage in the expansion joint.

[0003] When using traditional methods for maintenance, the following steps are required: remove the old expansion joint device - install the steel expansion joint side beam - re-tie the steel bars and connect the embedded steel bars to the side beam anchors - fill the steel expansion joint with foam board - pour the anchor belt concrete - remove the foam board in the expansion joint - install the water stop. In this construction method, there is no effective elevation and position fixing measures for the installation of the side beam, and the height and position are prone to shifting when pouring concrete; the gap between the lower part of the side beam and the bridge deck relies on the foam board for support, and it is easy to expand the mold and leak when pouring concrete, resulting in contamination of the lower structure and blockage of the expansion joint; when pouring the anchor belt concrete, the construction height of the concrete post-casting strip is controlled by the side beam elevation, and the probability of deviation is relatively high. In short, according to the traditional construction method, the surface flatness, overall waterproofing and free expansion and contraction function of the expansion joint have great quality risks.

[0004] In order to solve this problem, we proposed a bridge steel expansion joint repair construction method based on a new formwork system. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a bridge steel expansion joint maintenance construction method based on a novel formwork system to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a bridge steel expansion joint maintenance construction method based on a new formwork system, comprising the following steps: S1: Preparation before construction: (1) Study of construction drawings; (2) Conduct on-site inspections to confirm the construction site and construction environment; (3) Briefing of construction personnel and preparation of materials and machinery.

[0007] S2: On-site construction: (1) Remove the damaged expansion joint structure and clean the base layer; (2) Arrange and re-tie the steel bars; (3) Install the formwork and check the position, structural dimensions, top surface elevation and verticality of the formwork; (4) Use a horizontal laser instrument to mark the construction elevation of the side beams and anchor belt concrete on both sides; (5) Install the side beams on both sides, fix the installation height of the top surface of the side beams by erecting reinforcement, and weld the embedded steel bars to the side beam anchors. (6) Pour the anchor belt concrete, level the surface and maintain for half an hour, then remove the formwork; (7) Fill the lower part of the expansion joint with flexible waterproof material and install waterstop; maintain the concrete to reach the design strength, open to traffic, and observe the structure regularly.

[0008] S3: Construction summary: (1) Whether the expansion joint function meets the design requirements; (2) Analysis of construction effectiveness and economic benefits.

[0009] (3) Develop corresponding technical improvements and targeted repair plans based on the characteristics of the expansion joint damage on site.

[0010] Furthermore, the construction personnel, materials and machinery preparations include: 6 technical workers and 5 auxiliary workers; rail-supported aluminum formwork, self-sealing basket bolts, foam double-sided tape, release agent, silicone sealant, steel side beams, rubber waterstop; laser level, open-end wrench, hand-held grinder, oxygen-acetylene flame cutting equipment, air compressor, electric pick, electric welder, generator, 1 three-ton truck, 1 construction personnel transport vehicle, and 2 road fencing vehicles.

[0011] Furthermore, the damaged expansion joint structure is removed and the base layer is cleaned.

[0012] Furthermore, after the original expansion joint structure is dismantled, the embedded steel bars are rearranged. If the embedded steel bars are damaged, they should be re-embedded. The number and specifications of the embedded steel bars meet the design requirements. The steel bars in the anchor belt are re-tied according to the construction drawings. The steel bar specifications, tying spacing, and protective layer thickness must meet the design requirements.

[0013] Furthermore, the formwork is fixed in place by means of basket bolts, and the reserved width of the expansion joint is adjusted; the installation position, top surface elevation, and side verticality of the formwork are checked, and the acceptance quality should meet the requirements of the specifications.

[0014] Furthermore, a horizontal laser instrument is used to mark the construction control elevations of the edge beams and the top surface of the anchoring concrete on the formwork.

[0015] Furthermore, the side beams are installed and fixed with reinforcement bars, and finally the reserved structural steel bars are welded to the side beam anchors, with the weld height and length meeting the design requirements.

[0016] Further, pour the anchor belt concrete, level the surface and cure for half an hour, loosen the turnbuckle bolts and remove the formwork.

[0017] Furthermore, in accordance with the design requirements of the drawings, the lower part of the expansion joint is filled with flexible waterproof material and a waterstop is installed; when the concrete strength reaches the design strength, traffic is opened and the structure is observed regularly.

[0018] Furthermore, the construction summary includes the following steps: (1) whether the expansion joint function meets the design requirements; (2) construction efficacy and economic benefit analysis; (3) formulating corresponding technical improvements and targeted repair plans based on the characteristics of the on-site expansion joint damage.

[0019] Technical effects and advantages of the present invention: (1) Compared with the prior art, the present invention is based on a new formwork system for the repair and construction of bridge steel expansion joints. The formwork system can be applied to the repair and construction of various specifications of steel expansion joints by replacing the specifications of the closed basket bolts, solving the problem of being unable to install the formwork due to narrow gaps. In addition, the use of the new formwork system solves the problems of inaccurate control of the position and elevation of the side beams and the poor overall flatness of the anchor concrete belt and the asphalt surface layer. The construction operation is simple, the method is reliable, and the efficiency of the repair and construction of bridge steel expansion joints is increased, saving construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] As attached Figure 1 A bridge steel expansion joint maintenance construction method of a novel formwork system is shown, comprising the following steps: S1: Preparation before construction: (1) Study of construction drawings; (2) Conduct on-site inspections to confirm the construction site and construction environment; (3) Briefing of construction personnel and preparation of materials and machinery.

[0023] S2: On-site construction: (1) Remove the damaged expansion joint structure and clean the base layer; (2) Arrange and re-tie the steel bars; (3) Install the formwork and check the position, structural dimensions, top surface elevation and verticality of the formwork; (4) Use a horizontal laser instrument to mark the construction elevation of the side beams and anchor belt concrete on both sides; (5) Install the side beams on both sides, fix the installation height of the top surface of the side beams by erecting reinforcement, and weld the embedded steel bars to the side beam anchors. (6) Pour the anchor belt concrete, level the surface and maintain for half an hour, then remove the formwork; (7) Fill the lower part of the expansion joint with flexible waterproof material and install waterstop; maintain the concrete to reach the design strength, open to traffic, and observe the structure regularly. S3: Construction summary: (1) Whether the expansion joint function meets the design requirements; (2) Analysis of construction effectiveness and economic benefits.

[0024] (3) Develop corresponding technical improvements and targeted repair plans based on the characteristics of the expansion joint damage on site.

[0025] In a preferred embodiment, the construction personnel, materials and machinery preparation include: 6 technical workers and 5 auxiliary workers; rail-supported aluminum formwork, self-sealing basket bolts, foam double-sided tape, release agent, silicone sealant, steel side beam, rubber waterstop; laser level, open-end wrench, hand-held grinder, oxygen-acetylene flame cutting equipment, air compressor, electric pick, electric welder, generator, 1 three-ton truck, 1 construction personnel transport vehicle, and 2 road fencing vehicles.

[0026] In a preferred embodiment, the damaged expansion joint structure is removed and the base layer is cleaned.

[0027] In a preferred embodiment, the template is fixed in place by means of basket bolts, and the reserved width of the expansion joint is adjusted; the installation position, top surface elevation, and side verticality of the template are checked, and the acceptance quality should meet the requirements of the specifications.

[0028] In a preferred embodiment, a horizontal laser instrument is used to mark the construction control elevations of the edge beams and the top surface of the anchoring concrete on the template.

[0029] In a preferred embodiment, the side beams are installed and fixed with reinforcement bars, and finally the reserved structural steel bars are welded to the side beam anchors, and the weld height and length meet the design requirements.

[0030] In a preferred embodiment, the anchoring belt concrete is poured, the surface is leveled and cured for half an hour, the turnbuckle bolts are loosened, and the formwork is removed.

[0031] In a preferred embodiment, according to the design requirements of the drawings, the lower part of the expansion joint is filled with flexible waterproof material and a water stop is installed; when the concrete strength reaches the design strength, traffic is opened and the structure is regularly observed.

[0032] In a preferred embodiment, the construction summary includes the following steps: (1) Whether the expansion joint function meets the design requirements; (2) Analysis of construction effectiveness and economic benefits.

[0033] (3) Develop corresponding technical improvements and targeted repair plans based on the characteristics of the expansion joint damage on site.

[0034] Beneficial effects of the invention: The invention replaces the traditional bridge steel expansion joint maintenance construction method with a bridge steel expansion joint maintenance construction method based on a new template system. The template system can be applied to the maintenance construction of various specifications of steel expansion joints, solving the problem that the template cannot be installed due to narrow gaps. In addition, the use of the new template system solves the technical problems of inaccurate control of the position and elevation of the side beams and the poor overall flatness of the anchor concrete belt and the asphalt surface layer. The construction operation is simple, the method is reliable, and the efficiency of the bridge steel expansion joint maintenance construction is increased, saving construction time.

[0035] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bridge steel expansion joint maintenance construction method based on a new formwork system, characterized by: The following steps are involved: Preparation before construction: (1) Study the construction drawings; (2) On-site inspection to confirm the construction site and construction environment; (3) Brief the construction personnel, and prepare materials and machinery. On-site construction: (1) Remove the damaged expansion joint structure and clean the base; (2) Arrange the steel bars and re-tie the steel bars; (3) Install the formwork and check the position, structural dimensions, top surface elevation, and verticality of the formwork; (4) Use a horizontal laser to mark the construction elevations of the side beams and anchor belt concrete on both sides; (5) Install the side beams on both sides, fix the installation height of the top surface of the side beams by erecting reinforcement, and weld the embedded steel bars to the side beam anchors; (6) Pour the anchor belt concrete, level the surface and maintain for half an hour, and remove the formwork; (7) Fill the lower part of the expansion joint with flexible waterproof material and install the water stop; maintain the concrete to the design strength, open traffic, and observe the structure regularly. Construction summary: (1) Whether the expansion joint function meets the design requirements; (2) Analysis of construction efficacy and economic benefits. (3) Develop corresponding technical improvements and targeted repair plans based on the characteristics of the expansion joint damage on site.

2. According to claim 1, a bridge steel expansion joint maintenance construction method based on a new formwork system is characterized by: The construction personnel, materials and machinery preparations include: 6 technical workers and 5 auxiliary workers; rail-supported aluminum formwork, self-sealing basket bolts, foam double-sided tape, release agent, silicone sealant, steel side beams, rubber waterstop; laser level, open-end wrench, hand-held grinder, oxygen-acetylene flame cutting equipment, air compressor, electric pick, electric welder, generator, 1 three-ton truck, 1 construction personnel transport vehicle, and 2 road fencing vehicles.

3. According to claim 1, a bridge steel expansion joint maintenance construction method based on a new formwork system is characterized by: A rail-supported aluminum formwork is installed in the steel expansion joint to replace the traditional caulking material for the functions of forming and plugging leaks.

4. The bridge steel expansion joint maintenance construction method based on the new formwork system according to claim 1 is characterized by: The track-supported aluminum formwork uses its own track to install the self-sealing basket bolts to the exact supporting position, and the formwork is reinforced by adjusting the self-sealing basket bolts.

5. The bridge steel expansion joint maintenance construction method based on the new formwork system according to claim 1 is characterized by: The rail-supported aluminum formwork can adapt to the maintenance and construction of expansion joints of different designs by replacing the specifications of the self-sealing basket bolts.

6. The bridge steel expansion joint maintenance construction method based on the new formwork system according to claim 1 is characterized by: Change the control method of expansion joint side beams and concrete construction top surface elevation, and control it through the marking lines on the side of the formwork.

7. The bridge steel expansion joint maintenance construction method based on the new formwork system according to claim 1 is characterized by: The formwork can be removed 0.5 hours after the concrete of the post-cast zone is poured. There is no need to clean the joints, and the filling material can be constructed in one go.

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