CN111778972A - Wedge block pre-tightening type fiber anchor rod connecting sleeve and fiber anchor rod connecting method - Google Patents

Abstract

A wedge block pre-tightening type fiber anchor rod connecting sleeve and a fiber anchor rod connecting method are disclosed, wherein the sleeve comprises a cylinder body and a wedge block, and a glue injection port and a glue solution overflow port are formed in the cylinder body; the inner surfaces of the openings at the two ends of the cylinder body are in a conical structure, the small-diameter end of the opening faces the outer side of the cylinder body, and the large-diameter end of the opening faces the inner side of the cylinder body; the wedge block adopts a three-petal structure and is positioned at the opening of the cylinder body; the upper surface of the wedge block is provided with a spring steel sheet, and a gap is reserved between the spring steel sheet and the wedge block; the spring steel sheet is provided with a limit pin. The method comprises the following steps: coaxially aligning two fiber anchor rods; brushing epoxy resin glue on the butt joint end rod body, wherein the length of the brushed glue is greater than half the length of the barrel body; brushing glue and winding three layers of fiber cloth; expanding the wedge block by expanding pliers, and penetrating the fiber anchor rod into the cylinder body until the cylinder body is positioned at the butt joint of the fiber anchor rod; removing the expansion pliers, and pressing the wedge block on the fiber anchor rod under the action of spring force to generate radial pressure on the fiber anchor rod; injecting glue into the cylinder from the glue injection port until glue flows out from the glue solution overflow port, and waiting for epoxy resin glue in the cylinder to be completely cured.

Description

Wedge block pre-tightening type fiber anchor rod connecting sleeve and fiber anchor rod connecting method

Technical Field

The invention belongs to the technical field of civil engineering, and particularly relates to a wedge block pre-tightening type fiber anchor rod connecting sleeve and a fiber anchor rod connecting method.

Background

In recent years, civil engineering construction has been rapidly developed, and reinforcing techniques of reinforcing steel bar anchor rods have been widely used along with civil engineering construction. However, with the improvement of the utilization rate of the construction site and the increase of the depth of foundation engineering, the defects of large self weight, difficult transportation and installation and poor corrosion resistance of the traditional steel bar anchor rod are more and more obvious, so the application of the steel bar anchor rod is limited to a certain extent.

For this reason, fiber anchor rods are increasingly used, and compared with steel bar anchor rods, the fiber anchor rods have the advantages of light weight, convenience in transportation and installation and strong corrosion resistance. However, the application of the fiber anchor rod is still in the starting stage of engineering practice, because the fiber anchor rod is made of thermosetting materials and has poor bending capability, the fiber anchor rod cannot be made into a wire rod shape to be transported to a construction site for cutting, and the fiber anchor rod can only be prefabricated into a rod shape with a fixed length and a fixed length in a factory and then transported to the construction site, and then the fiber anchor rods with the fixed length and the fixed length are connected into a required length. However, the fiber anchor rods cannot be welded and connected like the steel bar anchor rods, and only the binding and overlapping manner or the mechanical punching manner is used for connection, so that not only is the connection efficiency of the fiber anchor rods low, but also the connected fiber anchor rods have the problems of small anchoring force (binding and overlapping manner) or stress concentration (mechanical punching manner), and further the high tensile property of the fiber anchor rods cannot be fully exerted. Therefore, it is necessary to solve the problems of the fiber anchor rod connection in order to promote the development and application of the fiber anchor rod in the civil engineering construction field.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a wedge block pre-tightening type fiber anchor rod connecting sleeve and a fiber anchor rod connecting method, wherein the tensile strength of a connecting part of a fiber anchor rod can reach 90% of the ultimate strength of the fiber anchor rod, and the high tensile property of the fiber anchor rod can be fully exerted.

In order to achieve the purpose, the invention adopts the following technical scheme: a wedge block pre-tightening type fiber anchor rod connecting sleeve comprises a cylinder body and a wedge block; the barrel is of a cylindrical structure, and is provided with a glue injection port and a glue solution overflow port; the inner surfaces of the openings at the two ends of the cylinder body are in conical structures, the small-diameter end of the conical opening faces the outer side of the cylinder body, and the large-diameter end of the conical opening faces the inner side of the cylinder body; the wedge block is of a three-petal structure and is positioned at the conical opening of the barrel; the upper surface of the wedge block is provided with a spring steel sheet, a gap is reserved between the spring steel sheet and the upper surface of the wedge block, one end of the spring steel sheet is fixedly connected with the thick wall end of the wedge block, the other end of the spring steel sheet is a free end, and the free end of the spring steel sheet is positioned above the thin wall end of the wedge block; the lower surface of the wedge block is of a concave arc surface structure, and the lower surface of the wedge block is in abutting contact fit with the fiber anchor rod; the upper surface of the spring steel sheet is provided with a limiting pin, a limiting hole is formed in the barrel body at the position of the conical barrel opening, and the limiting pin is located in the limiting hole.

The difference between the diameter of the inner surface of the cylinder body and the diameter of the rod body of the fiber anchor rod is at least 10 mm.

The length of the cylinder body is at least 10 times of the diameter of the fiber anchor rod body.

A fiber anchor rod connecting method adopts the wedge block pre-tightening type fiber anchor rod connecting sleeve and comprises the following steps:

the method comprises the following steps: placing two fiber anchor rods with fixed length and size on a workbench, coaxially aligning the two fiber anchor rods, wherein the coaxiality error is less than 1mm, and temporarily fixing the two fiber anchor rods;

step two: epoxy resin glue is brushed on the butt joint end rod body of each fiber anchor rod, and the length of the glue brushing on the rod body of each fiber anchor rod is larger than half of the length of the cylinder body;

step three: winding a first layer of fiber cloth on the two fiber anchor rod bodies brushed with the epoxy resin glue;

step four: brushing epoxy resin glue on the surface of the wound first layer of fiber cloth, and then winding a second layer of fiber cloth on the outer side of the first layer of fiber cloth brushed with the epoxy resin glue;

step five: brushing epoxy resin glue on the surface of the wound second layer of fiber cloth, and then winding a third layer of fiber cloth on the outer side of the second layer of fiber cloth brushed with the epoxy resin glue;

step six: firstly, temporarily expanding wedge blocks at conical barrel openings at two ends of a barrel by utilizing expansion pincers, then penetrating a fiber anchor rod assembly wound with three layers of fiber cloth into the barrel until the barrel is positioned at the butt joint of the fiber anchor rods, then removing the expansion pincers, pressing the wedge blocks on the fiber anchor rods under the action of spring force of spring steel sheets and generating radial pressure on the fiber anchor rods, and simultaneously realizing automatic centering and clamping on the fiber anchor rods;

step seven: preparing a glue injection hose, connecting the glue injection hose between a glue injection port and a prepared glue injection pump in a sealing manner, starting the glue injection pump, and injecting epoxy resin glue into the cylinder through the glue injection port until the epoxy resin glue flows out of a glue solution overflow port, so that the epoxy resin glue is filled in a cavity between the cylinder and the fiber anchor rod;

step eight: and closing the glue injection pump, removing the glue injection hose, and plugging the glue injection port and the glue solution overflow port until the epoxy resin glue in the cavity between the cylinder and the fiber anchor rod is completely cured, and finishing the connection of the fiber anchor rod.

The invention has the beneficial effects that:

according to the wedge block pre-tightening type fiber anchor rod connecting sleeve and the fiber anchor rod connecting method, the tensile strength of the fiber anchor rod at the connecting part can reach 90% of the ultimate strength of the fiber anchor rod, and the high tensile property of the fiber anchor rod can be fully exerted.

Drawings

Fig. 1 is a schematic structural view of a wedge pre-tensioned fiber anchor connecting sleeve according to the present invention;

FIG. 2 is a schematic structural view of the cartridge of the present invention;

FIG. 3 is a schematic view of the wedge of the present invention;

in the figure, 1-cylinder, 2-wedge block, 3-glue injection port, 4-glue overflow port, 5-spring steel sheet, 6-fiber anchor rod, 7-limit pin, 8-limit hole, 9-epoxy resin glue.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

As shown in fig. 1 to 3, a wedge pre-tightening type fiber anchor rod connecting sleeve comprises a cylinder body 1 and a wedge 2; the barrel 1 is of a cylindrical structure, and the barrel 1 is provided with a glue injection port 3 and a glue solution overflow port 4 respectively; the inner surfaces of the openings at the two ends of the cylinder body 1 are in a conical structure, the small-diameter end of the conical opening faces the outer side of the cylinder body 1, and the large-diameter end of the conical opening faces the inner side of the cylinder body 1; the wedge 2 is of a three-petal structure, and the wedge 2 is positioned at the conical opening of the barrel 1; a spring steel sheet 5 is arranged on the upper surface of the wedge block 2, a gap is reserved between the spring steel sheet 5 and the upper surface of the wedge block 2, one end of the spring steel sheet 5 is fixedly connected to the thick-wall end of the wedge block 2, the other end of the spring steel sheet 5 is a free end, and the free end of the spring steel sheet 5 is located above the thin-wall end of the wedge block 2; the lower surface of the wedge block 2 is of a concave arc surface structure, and the lower surface of the wedge block 2 is in abutting contact fit with the fiber anchor rod 6; the upper surface of the spring steel sheet 5 is provided with a limiting pin 7, a limiting hole 8 is formed in the barrel body 1 at the position of the conical barrel opening, and the limiting pin 7 is located in the limiting hole 8.

The difference between the diameter of the inner surface of the cylinder body 1 and the diameter of the rod body of the fiber anchor rod 6 is at least 10 mm.

The length of the cylinder body 1 is at least 10 times of the diameter of the rod body of the fiber anchor rod 6.

A fiber anchor rod connecting method adopts the wedge block pre-tightening type fiber anchor rod connecting sleeve and comprises the following steps:

the method comprises the following steps: placing two fiber anchor rods 6 with fixed length and size on a workbench, coaxially aligning the two fiber anchor rods 6, wherein the coaxiality error is less than 1mm, and then temporarily fixing the two fiber anchor rods 6;

step two: epoxy resin glue is brushed on the butt joint end rod body of each fiber anchor rod 6, and the length of the glue brushing on the rod body of each fiber anchor rod 6 is more than half of the length of the cylinder body 1;

step three: winding a first layer of fiber cloth on the two fiber anchor rods 6 brushed with the epoxy resin glue;

step four: brushing epoxy resin glue on the surface of the wound first layer of fiber cloth, and then winding a second layer of fiber cloth on the outer side of the first layer of fiber cloth brushed with the epoxy resin glue;

step five: brushing epoxy resin glue on the surface of the wound second layer of fiber cloth, and then winding a third layer of fiber cloth on the outer side of the second layer of fiber cloth brushed with the epoxy resin glue;

step six: firstly, temporarily expanding wedge blocks 2 at conical barrel openings at two ends of a barrel body 1 by utilizing expansion pincers, then penetrating a fiber anchor rod 6 assembly wound with three layers of fiber cloth into the barrel body 1 until the barrel body 1 is positioned at the butt joint of the fiber anchor rods 6, then removing the expansion pincers, pressing the wedge blocks 2 on the fiber anchor rods 6 under the action of spring force of a spring steel sheet 5 and generating radial pressure on the fiber anchor rods 6, and simultaneously realizing automatic centering and clamping on the fiber anchor rods 6;

step seven: preparing a glue injection hose, connecting the glue injection hose between the glue injection port 3 and a prepared glue injection pump in a sealing manner, starting the glue injection pump, injecting epoxy resin glue 9 into the cylinder body 1 through the glue injection port 3 until the epoxy resin glue 9 flows out from the glue solution overflow port 4, and indicating that the epoxy resin glue 9 is filled in a cavity between the cylinder body 1 and the fiber anchor rod 6;

step eight: and closing the glue injection pump, removing the glue injection hose, and plugging the glue injection port 3 and the glue solution overflow port 4 until the epoxy resin glue 9 in the cavity between the cylinder body 1 and the fiber anchor rod 6 is completely cured, and finishing the connection of the fiber anchor rod.

In this embodiment, the diameter of the rod body of the fiber anchor rod 6 is 30mm, the length of the rod body of a single fiber anchor rod 6 is 1m, and the fiber anchor rod 6 is made of glass fiber; the length of the cylinder body 1 is 300mm, the diameter of the inner surface of the middle section of the cylinder body 1 is 50.4mm, the wall thickness of the middle section of the cylinder body 1 is 5mm, the diameter of the outer surface of the cylinder body 1 is 60.4mm, the diameter of the large-diameter end of the conical opening of the cylinder body 1 is 50.4mm, the diameter of the small-diameter end of the conical opening of the cylinder body 1 is 40mm, the wall thickness of the small-diameter end of the conical opening of the cylinder body 1 is 10mm, and the cylinder body 1 is made of 65Mn steel; the length of the wedge block 2 in the axial direction is 60mm, the thickness of the thick-wall end of the wedge block 2 is 10.2mm, and the thickness of the thin-wall end of the wedge block 2 is 5 mm; the length of the spring steel sheet 5 is 60mm, and the thickness of the spring steel sheet 5 is 0.5 mm; the diameters of the limiting pin 7 and the limiting hole 8 are both 10 mm; when the fiber anchor rods are connected, the length of glue brushing on the rod body 6 of each fiber anchor rod is 170mm, the type of the brushed epoxy resin glue is EW25, the fiber cloth is plain glass fiber cloth, the thickness of the fiber cloth is 0.025 +/-0.05 mm, the type of the epoxy resin glue injected into the cylinder body 1 is E20-HP, the glue injection time is controlled within 10min, and the curing time of the epoxy resin glue in the cylinder body 1 is not less than 20 min.

The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.

Claims (4)

1. The utility model provides a voussoir pretension formula fibre stock connecting sleeve which characterized in that: comprises a cylinder body and a wedge block; the barrel is of a cylindrical structure, and is provided with a glue injection port and a glue solution overflow port; the inner surfaces of the openings at the two ends of the cylinder body are in conical structures, the small-diameter end of the conical opening faces the outer side of the cylinder body, and the large-diameter end of the conical opening faces the inner side of the cylinder body; the wedge block is of a three-petal structure and is positioned at the conical opening of the barrel; the upper surface of the wedge block is provided with a spring steel sheet, a gap is reserved between the spring steel sheet and the upper surface of the wedge block, one end of the spring steel sheet is fixedly connected with the thick wall end of the wedge block, the other end of the spring steel sheet is a free end, and the free end of the spring steel sheet is positioned above the thin wall end of the wedge block; the lower surface of the wedge block is of a concave arc surface structure, and the lower surface of the wedge block is in abutting contact fit with the fiber anchor rod; the upper surface of the spring steel sheet is provided with a limiting pin, a limiting hole is formed in the barrel body at the position of the conical barrel opening, and the limiting pin is located in the limiting hole.

2. A wedge pre-tensioned fibre anchor connecting sleeve according to claim 1, wherein: the difference between the diameter of the inner surface of the cylinder body and the diameter of the rod body of the fiber anchor rod is at least 10 mm.

3. A wedge pre-tensioned fibre anchor connecting sleeve according to claim 1, wherein: the length of the cylinder body is at least 10 times of the diameter of the fiber anchor rod body.

4. A method of connecting a fiber anchor rod using the wedge pre-tensioned fiber anchor rod connecting sleeve of claim 1, comprising the steps of:

the method comprises the following steps: placing two fiber anchor rods with fixed length and size on a workbench, coaxially aligning the two fiber anchor rods, wherein the coaxiality error is less than 1mm, and temporarily fixing the two fiber anchor rods;

step two: epoxy resin glue is brushed on the butt joint end rod body of each fiber anchor rod, and the length of the glue brushing on the rod body of each fiber anchor rod is larger than half of the length of the cylinder body;

step three: winding a first layer of fiber cloth on the two fiber anchor rod bodies brushed with the epoxy resin glue;

step four: brushing epoxy resin glue on the surface of the wound first layer of fiber cloth, and then winding a second layer of fiber cloth on the outer side of the first layer of fiber cloth brushed with the epoxy resin glue;

step five: brushing epoxy resin glue on the surface of the wound second layer of fiber cloth, and then winding a third layer of fiber cloth on the outer side of the second layer of fiber cloth brushed with the epoxy resin glue;

step six: firstly, temporarily expanding wedge blocks at conical barrel openings at two ends of a barrel by utilizing expansion pincers, then penetrating a fiber anchor rod assembly wound with three layers of fiber cloth into the barrel until the barrel is positioned at the butt joint of the fiber anchor rods, then removing the expansion pincers, pressing the wedge blocks on the fiber anchor rods under the action of spring force of spring steel sheets and generating radial pressure on the fiber anchor rods, and simultaneously realizing automatic centering and clamping on the fiber anchor rods;

step seven: preparing a glue injection hose, connecting the glue injection hose between a glue injection port and a prepared glue injection pump in a sealing manner, starting the glue injection pump, and injecting epoxy resin glue into the cylinder through the glue injection port until the epoxy resin glue flows out of a glue solution overflow port, so that the epoxy resin glue is filled in a cavity between the cylinder and the fiber anchor rod;

step eight: and closing the glue injection pump, removing the glue injection hose, and plugging the glue injection port and the glue solution overflow port until the epoxy resin glue in the cavity between the cylinder and the fiber anchor rod is completely cured, and finishing the connection of the fiber anchor rod.

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