CN211036667U - Tension string type FRP pipe seawater coral aggregate concrete arch bridge structure - Google Patents

Abstract

The utility model discloses a string-type FRP pipe seawater coral aggregate concrete arch bridge structure, which comprises a plurality of arc-shaped arches arranged side by side, and a plurality of strut structures are arranged under each arc-shaped arch; Including arc-shaped FRP tubular arch formwork, each strut structure includes FRP tubular strut formwork, and seawater coral aggregate concrete is poured into the arc-shaped FRP tubular arch formwork and FRP tubular strut formwork; The arch feet of the FRP tubular arch formwork are fixed and poured into the concrete foundation, and the concrete foundation is preset with holes for passing through the prestressed FRP strands; the lower part of each strut structure is supported by the prestressed FRP strands, and each Stressed FRP strands pass through the holes on the concrete foundation and are anchored at the edge of the concrete foundation; the top of the arc-shaped arch is covered with soil and paved with pavement. In the construction of marine engineering, the utility model can use seawater and coral aggregates to prepare concrete on the spot, reduce the material transportation cost, and has good economic benefits.

Description

A tension-string FRP tube seawater coral aggregate concrete arch bridge structure

technical field

The utility model relates to the technical field of marine engineering structures, in particular to a tension-string type FRP pipe seawater coral aggregate concrete arch bridge structure.

Background technique

The marine environment is a typical corrosive environment. In this environment, seawater is a strong corrosive medium. At the same time, waves, waves, tides and currents produce low-frequency reciprocating stress and impact on metal components. Attached organisms and their metabolites all directly or indirectly accelerate the corrosion process, so ordinary metal materials are not ideal materials for the construction of marine engineering. In addition, due to the distance from the mainland, the islands and reefs in the far sea lack fresh water and sand and gravel aggregates required for concrete production, and the transportation from the inland to the islands and reefs is costly and inefficient. The construction of ordinary reinforced concrete structures requires tedious steps such as tying steel bars, supporting formwork, pouring, and removing formwork, while CFST arch bridges need to expose a large area of steel to the strong corrosive environment of the ocean. Therefore, the existing CFST bridges And reinforced concrete bridges cannot well meet the economical, durable and efficient needs of island reef construction. Fiber Reinforced Polymer (FRP) can provide an ideal way to solve the above problems.

Therefore, for those skilled in the art, developing a new type of structure that can use FRP to constrain seawater coral aggregate concrete to meet the needs of rapid bridge assembly and construction, and has high bearing capacity and high durability at the same time, has become an urgent problem to be solved in this field. technical problem.

Utility model content

Purpose of the utility model: In order to overcome the deficiencies in the prior art, the utility model provides a tension-string FRP pipe seawater coral aggregate concrete arch bridge structure.

Technical scheme: In order to solve the above-mentioned technical problems, a tension-string FRP pipe seawater coral aggregate concrete arch bridge structure of the present invention includes a plurality of arc-shaped arches arranged side by side, and a plurality of struts are arranged under each arc-shaped arch. Structure; each arc-shaped arch body includes an arc-shaped FRP tubular arch body form, each strut structure includes a FRP tubular strut-rod form, and seawater is poured into the arc-shaped FRP tubular arch formwork and the FRP tubular strut formwork Coral aggregate concrete; the arch feet of each arc-shaped FRP tubular arch formwork are fixed and poured in the concrete foundation, and the holes for passing through the prestressed FRP strands are preset in the concrete foundation; the lower part of each strut structure is pre-set. Stressed FRP strands are supported, and each prestressed FRP strand passes through the holes on the concrete foundation and is anchored at the edge of the concrete foundation; the top of the arc-shaped arch body is covered with soil and paved with pavement.

Wherein, the upper end of each FRP tubular strut formwork is inserted and connected to the inner arc side of the FRP tubular arch formwork.

Wherein, the connection between the FRP tubular strut formwork and the FRP tubular arch formwork is wound with FRP dipped cloth.

Wherein, the FRP arc arch formwork and the FRP tubular strut formwork are both prefabricated by impregnating woven FRP cloth.

Wherein, the concrete in the arc-shaped arch body and the strut structure is seawater coral aggregate concrete, and the concrete foundation is poured from seawater coral aggregate concrete.

Wherein, the lower end of the FRP tubular strut formwork and both ends of the arc-shaped FRP tubular arch formwork are provided with arc-shaped grooves matched with prestressed FRP strands, and the prestressed FRP strands and the FRP tubular struts The parts in contact with the mold shell are protected by a stainless steel sleeve infused with resin inside.

Wherein, both ends of the prestressed FRP strands are anchored by threaded sleeves.

Beneficial effects: The utility model has the following beneficial effects:

1. The arch bridge structure of the present utility model can use seawater and coral aggregates to prepare concrete using local materials during marine engineering construction, which greatly reduces material transportation costs and has good economic benefits;

2. The utility model utilizes the characteristics of light weight and high strength of the novel prefabricated FRP pipe, which can be used not only as a mold for concrete pouring, but also as a main stress member when a bridge is formed, which greatly improves the construction efficiency;

3. The arch bridge structure of the present utility model effectively avoids the economic loss caused by the corrosion of the steel under the corrosion resistance of the FRP pipe, and can greatly improve the durability of the structure;

4. The utility model adopts the post-tensioning prestressing technology to form a tension string structure with reasonable stress, which effectively reduces the thrust at the arch foot, reduces the requirements for the arch foot foundation, and is beneficial to the poor foundation conditions such as islands and islands. construction of arch bridges.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is a cross-sectional view of an arch structure;

Figure 3 is a cross-sectional view of a strut structure;

Figure 4 is a schematic diagram of the reinforcement method of the connection between the FRP arc arch formwork and the FRP tubular strut formwork;

Figure 5 is a schematic diagram of the arc groove at the lower end of the strut structure;

Figure 6 is a schematic diagram of the steel thread anchorage at the end of the prestressed FRP strand;

Fig. 7 is the schematic diagram of the stainless steel sleeve in the middle of the prestressed FRP stranded wire;

Figure 8 is a schematic diagram of the detailed structure of the prestressed FRP stranded wire tensioning and anchoring end and the contact turning point of the strut structure;

Figure 9 is a top view of a plurality of string arches arranged side by side;

Fig. 10 is a schematic diagram after the treatment of the anchor with fine stone concrete.

In the picture: 1-Arc FRP tubular arch formwork; 2-FRP tubular strut formwork; 3-Top cover; 4-Pavement; 5-Seawater coral aggregate concrete; 6-FRP dipped cloth; 7-Arc groove; 8-prestressed FRP strand; 9-threaded sleeve; 10-epoxy resin glue; 11-stainless steel casing; 12-nut; 13-concrete foundation; 14-fine stone concrete; 15-reserved hole .

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 10, a stretched-string FRP pipe seawater coral aggregate concrete arch bridge structure of the present invention includes an arc-shaped arch body and a strut structure, and each arc-shaped arch body includes a plurality of prefabricated arches arranged side by side. Arc-shaped FRP tubular arch formwork 1, the strut structure includes a plurality of FRP tubular strut formwork 2, each arc-shaped FRP tubular arch formwork 1 is provided with a plurality of FRP tubular strut formwork 2, and each FRP tubular strut formwork 2 is provided. The upper end of the rod formwork 2 is inserted into the lower part of the arc-shaped FRP tubular arch formwork 1, and is wound and connected with FRP-impregnated cloth 6; The seawater coral aggregate concrete 5 forms an integrated arc-shaped arch body and a strut structure; a plurality of the above-mentioned integrated structures are placed side by side, and the arch feet are fixed and poured into the seawater coral aggregate concrete foundation 13, and are preset in the foundation. In the reserved hole 15 passing through the prestressed FRP stranded wire 8; the arc groove 7 is opened at the lower part of the strut structure, and the prestressed FRP stranded wire 8 is set and post-tensioned to form a prestressed FRP stranded wire-FRP pipe seawater coral bone All prestressed FRP strands 8 pass through the seawater coral aggregate concrete foundation 13 and are anchored in the edge area; the top cover 3 and pavement 4 are laid on the tensioned arch structure.

The construction method of the present utility model comprises the following steps:

S1: According to the actual size needs, use the method of dipping FRP cloth to make the arc FRP tubular arch formwork 1 and the FRP tubular strut formwork 2, and use a punch in the arc FRP tubular arch formwork 1 A hole is punched at the predetermined position of the arc side strut structure, and the FRP tubular strut formwork 2 is inserted into the hole and temporarily bonded with strong resin glue. As shown in Figure 4, an integrated FRP arch formwork with struts is formed;

S2: Place and fix the prepared one-piece FRP formwork with the arch feet facing up, and inject seawater coral aggregate concrete 5 from the arch foot port and the strut structure port until the entire formwork is filled with seawater coral bone The strength of the concrete is configured according to the structural design. As shown in Figure 5, after forming, the arc groove 7 for inserting the external prestressed FRP strand is processed at the end of the strut structure and the position of the arch foot, and the above process is repeated. Making multiple FRP pipe arch structures poured with seawater coral aggregate concrete;

S3: Support the formwork of the seawater coral aggregate concrete foundation 13 and reserve the channel 15. The foundation formwork erected for the first time is in the shape of a cube with cut corners, and the FRP pipe arch structure prepared above is fixed side by side in the prefabricated manner by means of additional support. Set the location and pour the seawater coral aggregate concrete foundation 13;

S4: Use threaded sleeves 9 to anchor the two ends of the prestressed FRP stranded wire 8, and fix the stainless steel sleeve 11 at the contact position between the prestressed FRP stranded wire 8 and the floor groove 7 of the strut structure for protection. The length of the sleeve is determined by the actual anchorage. The length and the diameter of the strut are determined;

S5: Pass the prepared prestressed FRP stranded wire 8 through the reserved hole 15 and the arc groove 7 in sequence, and after reaching the preset position, apply prestress to the FRP stranded wire and use the nut 12 to anchor it on the seawater coral aggregate concrete At the cut corners, a tensioned arch structure is formed;

S6: Repeat steps S4 and S5 to prepare multiple tensioned arch structures; set up formwork at the cut corners of the concrete foundation, use fine stone concrete 14 to seal the tensioned ends and the anchored ends, and fill the prefabricated ends in the foundation. Leave hole 15;

S7: Lay top cover 3 on the completed stretched arch, and then lay pavement 4 on the uppermost layer.

Claims (7)

1. The utility model provides a string formula FRP pipe sea water coral aggregate concrete arch bridge structure which characterized in that: the device comprises a plurality of arc-shaped arch bodies arranged side by side, wherein a plurality of brace rod structures are arranged below each arc-shaped arch body; each arc arch comprises an arc FRP tubular arch formwork, each brace structure comprises an FRP tubular brace formwork, and seawater coral aggregate concrete is poured into the arc FRP tubular arch formwork and the FRP tubular brace formwork; the arch springing of each arc FRP tubular arch body formwork is fixedly poured in a concrete foundation, and a pore passage for penetrating through the prestress FRP stranded wire is preset in the concrete foundation; the lower part of each support rod structure is supported by a prestressed FRP stranded wire, and each prestressed FRP stranded wire passes through a pore channel on the concrete foundation and is anchored at the edge of the concrete foundation; the top of the arc arch body is covered with soil and paved with a road surface.

2. The tension string type FRP pipe seawater coral aggregate concrete arch bridge structure of claim 1, which is characterized in that: the upper end of each FRP tubular brace formwork is inserted at the inner arc side of the FRP tubular arch formwork.

3. The tension string type FRP pipe seawater coral aggregate concrete arch bridge structure of claim 1, which is characterized in that: and FRP (fiber reinforced plastic) impregnated cloth is wound at the joint of the FRP tubular brace formwork and the FRP tubular arch formwork.

4. The tension string type FRP pipe seawater coral aggregate concrete arch bridge structure of claim 1, which is characterized in that: the FRP arc arch body formwork and the FRP tubular brace formwork are both formed by weaving FRP cloth and dipping glue in a prefabrication mode.

5. The tension string type FRP pipe seawater coral aggregate concrete arch bridge structure of claim 1, which is characterized in that: the concrete foundation is formed by pouring seawater coral aggregate concrete.

6. The tension string type FRP pipe seawater coral aggregate concrete arch bridge structure of claim 1, which is characterized in that: the lower end of the FRP tubular brace formwork and the two ends of the arc FRP tubular arch formwork are provided with arc grooves matched with the prestress FRP stranded wires, and the contact part of the prestress FRP stranded wires and the FRP tubular brace formwork is protected by a stainless steel sleeve filled with resin.

7. The tension string type FRP pipe seawater coral aggregate concrete arch bridge structure of claim 1, which is characterized in that: and two ends of each prestressed FRP stranded wire are anchored through a threaded sleeve.

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