CN108824228A - A kind of method of bamboo combined housing reinforced bridge pier - Google Patents

Abstract

A method for reinforcing a bridge pier with a bamboo composite shell, by wrapping a flexible net on the periphery of the original bridge pier, setting inner pads, outer pads and bottom filling strips, winding more than one layer of bamboo composite boards outside the flexible net to form a bamboo composite shell, After the strength of the bamboo composite shell meets the specified requirements, filling materials are poured into the gap between the bamboo composite shell and the original pier to realize the reinforcement of the pier. The invention makes full use of the advantages and characteristics of various materials such as bamboo and flexible nets. The bamboo composite shell is made of thin-layer bamboo composite boards wound layer by layer, which saves the trouble of making steel templates or splicing wooden templates, and the bamboo composite shell is During the operation of the bridge, it is directly used as a reinforcing material for pier reinforcement. The flexible mesh construction is convenient and easy to form, without the need for steel bar binding and welding. Anti-seismic performance.

Description

Method for strengthening bridge pier with bamboo composite shell

technical field

The invention particularly relates to a method for strengthening a bridge pier, in particular a method for strengthening a bridge pier by using a flexible net and a bamboo composite shell, and belongs to the field of civil engineering.

Background technique

In the stress system of the bridge, the pier, as the main structure and main support of the bridge, not only bears all the loads from the bridge span structure, but also directly bears various loads such as pressure, water impact force, and ship impact force. Under the action of load and external environment, bridge piers are prone to various diseases, such as detachment of the concrete surface of bridge piers, honeycomb, cracks, exposed ribs, etc. The existence of these diseases greatly reduces the durability and stability of bridge piers, and in severe cases, it will also cause bridge collapse, increase economic costs, affect people's normal traffic and travel, and have great potential safety hazards. The destruction of the bridge pier will lead to the interruption of the "lifeline" of the bridge, and the loss caused by the economy and casualties will be immeasurable. Whether it is the reinforcement of the bearing capacity of the old dangerous bridge, the seismic reinforcement with insufficient earthquake resistance, or the reinforcement and repair of the damaged pier, Reinforced concrete bridge pier reinforcement and repair technology have important practical value and economic significance.

Commonly used bridge pier reinforcement methods mainly include enlarging section method, external prestressed reinforcement method, steel casing reinforcement method, etc. These methods have their own advantages and characteristics, and their roles and effects in practical applications are also different. As a traditional and widely used technical method, the enlarged section method is relatively simple in its construction process, but its steel bar processing, formwork production and erection are labor-intensive and time-consuming, and the construction site has a large amount of work and a long construction period; although the external prestressed reinforcement technology can Effectively prevent cracks and improve the stress of bridge piers, but the construction process is more complicated; the main disadvantage of steel casing reinforcement technology is that it requires more steel, and the processing and assembly of steel pipes are complicated, resulting in higher construction costs. And it is prone to material corrosion, which affects the service life of the bridge. In addition, the mechanical equipment required by the traditional bridge pier reinforcement method is easily restricted by the site, geology, traffic and other conditions around the pier, making construction inconvenient.

Flexible mesh such as steel wire mesh and fiber woven mesh has the advantages of light weight, corrosion resistance, easy forming, high toughness, etc. Compared with steel bars and steel plates, it has better forming convenience. Bamboo has excellent mechanical properties and is considered to be one of the most efficient materials in nature. Its tensile strength can reach more than 140MPa. The excellent mechanical properties of bamboo mainly come from bamboo fiber, which has a high strength-to-weight ratio. It grows fast, can be naturally degraded, and is cheap. Bamboo has been successfully used as a structural material in the field of civil engineering, such as raw bamboo, recombined bamboo, and bamboo glulam. The combination of materials such as bamboo composite shell made of flexible mesh and bamboo fiber is applied to the reinforcement of bridge piers, which is expected to exert outstanding comprehensive benefits.

Contents of the invention

The purpose of the present invention is to provide a method for reinforcing bridge piers with a bamboo composite shell, which uses a flexible net combined with a bamboo composite shell to reinforce the bridge piers, so as to improve the bearing capacity and durability of the bridge piers. By wrapping the flexible net on the periphery of the original pier, setting the inner spacer, the outer spacer and the bottom filling strip, winding more than one layer of bamboo composite boards outside the flexible net to form a bamboo composite shell, after the strength of the bamboo composite shell meets the specified requirements, Filling material is poured into the gap between the bamboo composite shell and the original bridge pier to realize the reinforcement of the bridge pier, which is characterized in that the construction steps are as follows:

1) Surface treatment of the original bridge pier: Treat the concrete surface of the original bridge pier, chisel the surface concrete, and fully remove the weak layer, cement slurry skin, grease and other stains on the original concrete surface until the solid surface is exposed.

2) Binding inner pads: Bind inner pads on the inside of the flexible net to control the thickness between the flexible net and the pier.

3) Install the flexible net: Lay the flexible net according to the size required by the design, take the side of the flexible net tied with the inner spacer as the inner side, and wrap at least one layer of flexible net on the surface of the original pier, and the circumferential lap length Less than 100mm, the flexible net wrapped around the original pier can effectively improve the shear bearing capacity, vertical bearing capacity, ductility, seismic performance and crack resistance of structural members.

4) Binding the outer pads: binding the outer pads of the flexible net to control the thickness between the flexible net and the bamboo composite shell.

5) Set bottom filling strips: At the bottom of the reinforced part of the original pier, wrap around the original pier and set the bottom filling strips.

6) Winding bamboo composite board: Wrap the bamboo composite board along the outer surface of the outer pad of the flexible net and the outer surface of the bottom filling strip. The number of winding layers is specified according to the design requirements. The material is solidified to form a bamboo composite shell, which is not only a formwork during bridge construction, but also a reinforcement material during bridge operation.

7) Filling filling material: use the grouting equipment to press the pre-mixed filling material into the gap between the bamboo composite shell and the original bridge pier. maintenance.

The flexible net is composed of vertically intersecting radial flexible tendons and latitudinal flexible tendons. The radial flexible tendons provide vertical flexural bearing capacity, and the latitudinal flexible tendons provide shear bearing capacity and additional constraint reinforcement for the piers. The crack resistance function is jointly provided to the flexible tendon and the latitudinal flexible tendon.

The flexible net is continuously wound on the surface of the original bridge pier, or the flexible net of predetermined size is coated on the surface of the original bridge pier layer by layer, and the circumferential lap joints of each layer are staggered from each other, and the circumferential lap length is not less than 100mm. Binding connection or buckle connection at the joint.

The bamboo composite board is formed by gluing and pressing bamboo fibers or cutting after pressing, the thickness of a single layer is 0.1-10mm, and the circumferential lap length of the bamboo composite board is not less than 100mm.

The flexible net is one of steel wire net, steel strand net, steel cable net, fiber braided net, fiber cable net or fiber reinforced net.

The filling material is mortar, concrete, structural glue, epoxy mortar or epoxy resin concrete, and the thickness of the filling material can be 10-200 mm. The filling material makes the flexible mesh combined with the original pier and bamboo composite shell.

The resin glue is one of epoxy resin glue, vinyl resin or polyurethane resin.

The bottom filling strip is one of rubber strips, rubber-plastic strips or foam cushion strips, which provide bottom plugging for filling material filling.

The invention mainly utilizes the excellent characteristics of the flexible net such as light weight, high strength, corrosion resistance, and convenient construction, and at the same time combines the bamboo composite shell and mortar to reinforce the pier. By wrapping the flexible net on the periphery of the original pier, setting the inner spacer, the outer spacer and the bottom filling strip, winding more than one layer of bamboo composite boards outside the flexible net to form a bamboo composite shell, after the strength of the bamboo composite shell meets the specified requirements, Filling material is poured into the gap between the bamboo composite shell and the original bridge pier to realize the reinforcement of the bridge pier, improve the bearing capacity and durability of the bridge pier, and repair the damaged part of the bridge pier. Compared with the traditional pier reinforcement technology, it has the following advantages compared with the existing technology:

(1) The bamboo composite shell is made by winding thin-layer bamboo composite boards layer by layer, and solidified to form a bamboo composite shell, especially for curved bridge piers, which saves the trouble of making steel formwork or splicing wood formwork; and the bamboo composite shell is on the bridge During the operation period, it can be directly used as a reinforcing material for pier reinforcement, and one material can be used for multiple purposes.

(2) The construction of the flexible mesh is convenient and easy to form, without the need for binding and welding of steel bars. The combined application of the flexible mesh and the bamboo composite shell can improve the shear capacity, flexural capacity, ductility and seismic performance of the original pier.

(3) The process is simple, the construction period is short, the maintenance cost is low, no large-scale equipment is required, the impact on navigation is small, and the original structure is not affected during reinforcement.

Description of drawings:

Fig. 1 is a three-dimensional schematic diagram of a bamboo composite shell reinforced bridge pier structure;

Fig. 2 is a process flow diagram of a method for reinforcing a bridge pier with a bamboo composite shell;

Fig. 3 is a kind of original bridge pier perspective schematic diagram of the method for reinforcing bridge pier with bamboo composite shell;

Fig. 4 is the original bridge pier section schematic diagram of the method for a kind of bamboo composite shell reinforcement bridge pier;

Fig. 5 is a kind of flexible net schematic diagram of the method for reinforcing pier with bamboo composite shell;

Fig. 6 is a kind of schematic diagram of the inner pad block of binding flexible net of the method for reinforcing bridge pier with bamboo composite shell;

Fig. 6A is a partial schematic view of the padding inside the flexible net of a method for reinforcing a bridge pier with a bamboo composite shell;

Fig. 7 is a three-dimensional schematic diagram of a method for reinforcing a bridge pier with a bamboo composite shell along the circumferential direction of the pier to be strengthened;

Fig. 8 is a schematic cross-sectional view of a method for reinforcing a bridge pier with a bamboo composite shell along the circumferential direction of the pier to be reinforced;

Fig. 9 is a three-dimensional schematic diagram of a method for binding a flexible net outer cushion block of a method for reinforcing a bridge pier with a bamboo composite shell;

Fig. 10 is a schematic cross-sectional view of a binding flexible net outer cushion block of a method for reinforcing a bridge pier with a bamboo composite shell;

Fig. 11 is a three-dimensional schematic diagram of the bottom filling strip setting method of a method for reinforcing a bridge pier with a bamboo composite shell;

Fig. 12 is a bamboo composite panel schematic diagram of a method for reinforcing a bridge pier with a bamboo composite shell;

Fig. 13 is a three-dimensional schematic diagram of a bamboo composite shell for strengthening a bridge pier by winding a bamboo composite plate to form a bamboo composite shell;

Fig. 14 is a kind of bamboo composite shell reinforced pier method continuous winding one deck bamboo composite board to form the cross-sectional diagram of bamboo composite shell;

Fig. 15 is a cross-sectional schematic view of a bamboo composite shell to form a bamboo composite shell by continuously winding two layers of bamboo composite panels to reinforce a bridge pier;

Fig. 16 is a three-dimensional schematic diagram of a method for reinforcing a bridge pier with a bamboo composite shell;

Fig. 17 is a schematic cross-sectional view of a method for reinforcing a bridge pier with a bamboo composite shell after pouring filling materials;

In the attached drawings, 1 is the original bridge pier; 2 is the flexible net; 3 is the bamboo composite shell; 5 is the filling material; 11 is the bottom filling strip; 21 is the radial flexible rib; Composite plate; 41 is the inner pad; 42 is the outer pad.

Detailed ways:

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings. The invention provides a method for reinforcing a bridge pier with a bamboo composite shell. By coating the flexible net 2 on the periphery of the original bridge pier 1, an inner cushion block 41, an outer cushion block 42 and a bottom filling strip 11 are arranged, and more than one layer is wound outside the flexible net 2 The bamboo composite board 31 forms the bamboo composite shell 3. After the strength of the bamboo composite shell reaches the specified requirements, the filling material 5 is poured into the gap between the bamboo composite shell 3 and the original pier 1 to realize the reinforcement of the pier. It is characterized in that Its construction steps are as follows:

1) Surface treatment of the original bridge pier: Treat the concrete surface of the original bridge pier 1, chisel the surface concrete, and fully remove the weak layer, cement slurry skin, grease and other stains on the original concrete surface until the solid surface is exposed.

2) Binding inner pads: binding inner pads 41 inside the flexible net 2 to control the thickness between the flexible net 2 and the original pier 1 .

3) Install the flexible net: Lay out the flexible net 2 according to the size required by the design, take the side of the flexible net 2 tied with the inner pad 41 as the inner side, and wrap at least one layer of the flexible net 2 on the surface of the original pier 1, ring The overlapping length is not less than 100mm.

4) Binding the outer pads: binding the outer pads 42 of the flexible net 2 to control the thickness between the flexible net 2 and the bamboo composite shell 3 .

5) Install bottom filling strips: set bottom filling strips 11 around the original pier 1 around the bottom of the reinforced part of the original pier 1 .

6) Winding bamboo composite board: wind the bamboo composite board 31 along the outer surface of the outer spacer 42 of the flexible net 2 and the outer surface of the bottom filling strip 11, the number of winding layers is specified according to the design requirements, and the layers and lap joints are glued with resin The bonding material is solidified to form the bamboo composite shell 3 .

7) Filling filling material: use the grouting equipment to press the pre-mixed filling material 5 into the gap between the bamboo composite shell 3 and the original pier 1, and the pressing process should be carried out continuously and stably. Carry out maintenance after filling the gap.

The flexible net 2 is composed of radial flexible ribs 21 and latitudinal flexible ribs 22 perpendicularly intersecting.

The flexible mesh 2 is continuously wound on the surface of the original bridge pier 1, or the flexible mesh 2 of predetermined size is coated on the surface of the original bridge pier 1 layer by layer, and the hoop overlaps of each layer are staggered from each other, and the hoop overlap length is different. Less than 100mm.

The bamboo composite board 31 is formed by gluing and pressing bamboo fibers or cutting them after pressing, the thickness of a single layer is 0.1-10 mm, and the circumferential lap length of the bamboo composite board 31 is not less than 100 mm.

The flexible net 2 is one of steel wire net, steel strand net, steel cable net, fiber braided net, fiber cable net or fiber reinforced net.

The filling material 5 is mortar, concrete, structural glue, epoxy mortar or epoxy resin concrete, the thickness of the filling material 5 can be 10-200 mm, and the filling material makes the flexible mesh combined with the original pier and bamboo composite shell .

The resin glue is one of epoxy resin glue, vinyl resin or polyurethane resin.

The bottom filling strip 11 is one of rubber strips, rubber-plastic strips or foam cushion strips.

Claims (8)

1. A method for reinforcing bridge piers with a bamboo composite shell, by coating flexible nets (2) on the periphery of the original bridge piers (1), inner pads (41), outer pads (42) and bottom filler strips (11) are set, Wind more than one layer of bamboo composite boards (31) outside the flexible net (2) to form a bamboo composite shell (3). Filling material (5) is poured into the gap between ) to realize the reinforcement of the pier, which is characterized in that its construction steps are as follows: 1) Surface treatment of the original bridge pier: Treat the concrete surface of the original bridge pier (1), chisel the surface concrete, and fully remove the weak layer, cement slurry skin, grease and other stains on the original concrete surface until the solid surface is exposed. 2) Binding the inner pads: binding the inner pads (41) inside the flexible net (2) to control the thickness between the flexible net (2) and the original pier (1). 3) Install the flexible net: Lay out the flexible net (2) according to the size required by the design, take the side of the flexible net (2) tied with the inner spacer (41) as the inner side, and wrap at least one layer of the flexible net (2) On the surface of the original bridge pier (1), the circumferential lap length shall not be less than 100mm. 4) Binding the outer pads: binding the outer pads (42) of the flexible net (2) to control the thickness between the flexible net (2) and the bamboo composite shell (3). 5) Setting bottom filling strips: at the bottom of the reinforced part of the original bridge pier (1), wind around the original bridge pier (1) and set the bottom filling strips (11). 6) Winding bamboo composite board: wind the bamboo composite board (31) along the outer surface of the outer pad (42) of the flexible net (2) and the outer surface of the bottom filling strip (11), and the number of winding layers is specified according to the design requirements. The lap joints are bonded with resin glue, and the bonding material is solidified to form a bamboo composite shell (3). 7) Filling filling material: through the grouting equipment, press the pre-mixed filling material (5) into the gap between the bamboo composite shell (3) and the original bridge pier (1), and the pressing process should be carried out continuously and stably , to be cured after the filling material (5) fills the gap. 2. The method for reinforcing bridge piers with a bamboo composite shell as claimed in claim 1, wherein said flexible net (2) is composed of radial flexible tendons (21) and latitudinal flexible tendons (22) vertically intersecting composition. 3. the method for a kind of bamboo composite shell reinforcement bridge pier as claimed in claim 1 is characterized in that described flexible net (2) is wound on former bridge pier (1) surface continuously, or the flexible net of predetermined size ( 2) Cover the surface of the original pier (1) layer by layer, and the circumferential lap joints of each layer are staggered from each other, and the circumferential lap joint length is not less than 100mm. 4. the method for a kind of bamboo composite housing reinforcement bridge pier as claimed in claim 1, it is characterized in that described bamboo composite board (31) is that bamboo fiber is glued and pressed or cut after pressing and forms, and its monolayer thickness is 0.1～10mm, the circumferential overlapping length of the bamboo composite board (31) is not less than 100mm. 5. the method for a kind of bamboo composite shell reinforcement bridge pier as claimed in claim 1 is characterized in that described flexible net (2) is steel wire net, steel strand net, steel cable net, fiber weaving net, fiber cable One of the mesh or fiber reinforced mesh. 6. the method for a kind of bamboo composite shell reinforcement bridge pier as claimed in claim 1 is characterized in that described filling material (5) is mortar, concrete, structural glue, epoxy mortar or epoxy resin concrete, and filling material (5) The thickness may be 10-200 mm. 7. The method for reinforcing a bridge pier with a bamboo composite shell as claimed in claim 1, wherein the resin glue is one of epoxy resin glue, vinyl resin or polyurethane resin. 8. A method for reinforcing a bridge pier with a bamboo composite shell as claimed in claim 1, characterized in that the bottom filling strip (11) is one of rubber strips, rubber-plastic strips or foam cushion strips.