CN111778974A - Threaded sleeve pre-tightening type fiber anchor rod connecting sleeve and fiber anchor rod connecting method - Google Patents

Abstract

A threaded sleeve pre-tightening type fiber anchor rod connecting sleeve and a fiber anchor rod connecting method are disclosed, wherein the sleeve comprises a cylinder body, a threaded sleeve and a sealing cover; the inner surface of the cylinder body is provided with internal threads, the inner side of the cylinder body is provided with a spring steel sheet, and a threaded sleeve screwing clearance is formed between the spring steel sheet and the cylinder body; the outer surface of the screw sleeve is provided with external threads; the surface of the spring steel sheet is provided with an anchor rod centering supporting block; the sealing cover is positioned at the opening of the screw sleeve and is provided with a glue solution inlet and outlet. 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; screwing the threaded sleeve into the clearance, applying radial extrusion force to the spring steel sheet through the threaded sleeve, and further applying radial pressure to the rod body through the anchor rod centering support block on the spring steel sheet; installing the sealing cover, injecting glue into the screw sleeve through the glue injection port of the sealing cover until epoxy resin glue flows out from the glue solution overflow port, and waiting for the epoxy resin glue in the screw sleeve to be completely cured.

Description

Threaded sleeve 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 threaded sleeve 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 the thread sleeve 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.

In order to achieve the purpose, the invention adopts the following technical scheme: a threaded sleeve pre-tightening type fiber anchor rod connecting sleeve comprises a cylinder body, a threaded sleeve and a sealing cover; the cylinder body is of a cylindrical structure, and internal threads are arranged on the inner surface of the cylinder body; a plurality of spring steel sheets are arranged on the inner side of the cylinder body and are parallel to the axis of the cylinder body, the plurality of spring steel sheets are uniformly distributed along the circumferential direction of the cylinder body, and the length of each spring steel sheet is equal to that of the cylinder body; one end of the spring steel sheet is fixedly connected with the opening of the barrel body, and the other end of the spring steel sheet is a free end; a threaded sleeve screwing clearance is formed between the spring steel sheet and the inner surface of the cylinder body, and the threaded sleeve screwing clearance is smaller than the wall thickness of the threaded sleeve; the surface of the spring steel sheet at the center side of the cylinder body is provided with a plurality of anchor rod centering support blocks, the number of the anchor rod centering support blocks is a plurality, and the anchor rod centering support blocks are uniformly distributed along the axis direction of the cylinder body; the surface of the anchor rod centering support block, which is in abutting contact with the fiber anchor rod, is provided with a concave arc surface structure; the barrel is of a cylindrical structure, external threads are arranged on the outer surface of the barrel, the external threads on the outer surface of the barrel are in threaded connection with the internal threads on the inner surface of the barrel, and the length of the barrel is equal to that of the barrel; the number of the sealing covers is two, and the two sealing covers are respectively arranged at the cylinder mouths at the two ends of the screw sleeve; and a glue solution inlet and outlet is formed in the sealing cover.

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

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

A fiber anchor rod connecting method adopts the threaded sleeve 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, a barrel is sleeved into a butt joint of fiber anchor rods wound with three layers of fiber cloth after passing through any one fiber anchor rod, then a threaded sleeve is sleeved into a threaded sleeve screwing gap of the barrel after passing through the fiber anchor rod on one side of the free end of a spring steel sheet, the threaded sleeve is screwed by a wrench, the inner surface of the threaded sleeve can generate radial extrusion force on the spring steel sheet in the process of screwing the threaded sleeve into the barrel, and after the threaded sleeve is completely screwed into the barrel, the radial extrusion force of the inner surface of the threaded sleeve on the spring steel sheet can be finally converted into the radial pressure of an anchor rod centering supporting block on the fiber anchor rod;

step seven: the two sealing covers are respectively sleeved on the screw sleeve through two fiber anchor rods, wherein a glue solution inlet and outlet on one sealing cover is used as a glue injection port, and a glue solution inlet and outlet on the other sealing cover is used as a glue solution overflow port;

step eight: preparing two metal hoops, and temporarily fixing the two sealing covers and the barrel body through the two metal hoops respectively;

step nine: preparing a glue injection hose, connecting the glue injection hose between a glue injection port of the sealing cover and a prepared glue injection pump in a sealing manner, starting the glue injection pump, injecting epoxy resin glue into the screw sleeve through the glue injection port of the sealing cover until the epoxy resin glue flows out from a glue solution overflow port of the sealing cover on the other side, and indicating that the epoxy resin glue is filled in a cavity between the screw sleeve and the fiber anchor rod;

step ten: and closing the glue injection pump, removing the glue injection hose, plugging the glue injection port and the glue solution overflow port until epoxy resin glue in the cavity between the thread sleeve and the fiber anchor rod is completely cured, and finally removing the two metal clamps for temporary fixation to finish the connection of the fiber anchor rod.

The invention has the beneficial effects that:

according to the thread sleeve 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 thread insert pre-tightening type fiber anchor rod 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 structural view of the insert of the present invention;

in the figure, 1-cylinder, 2-thread sleeve, 3-sealing cover, 4-spring steel sheet, 5-anchor rod centering supporting block, 6-fiber anchor rod, 7-glue solution inlet and outlet, 8-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 thread insert pre-tightening type fiber anchor rod connecting sleeve comprises a cylinder body 1, a thread insert 2 and a sealing cover 3; the cylinder body 1 is of a cylindrical structure, and internal threads are arranged on the inner surface of the cylinder body 1; a plurality of spring steel sheets 4 are arranged on the inner side of the cylinder 1, the spring steel sheets 4 are parallel to the axis of the cylinder 1, the spring steel sheets 4 are uniformly distributed along the circumferential direction of the cylinder 1, and the length of each spring steel sheet 4 is equal to that of the cylinder 1; one end of the spring steel sheet 4 is fixedly connected with the opening of the barrel body 1, and the other end of the spring steel sheet 4 is a free end; a threaded sleeve screwing clearance is formed between the spring steel sheet 4 and the inner surface of the barrel body 1, and the threaded sleeve screwing clearance is smaller than the wall thickness of the threaded sleeve 2; a plurality of anchor rod centering support blocks 5 are arranged on the surface of the spring steel sheet 4 on the center side of the barrel body 1, the number of the anchor rod centering support blocks is a plurality, and the anchor rod centering support blocks 5 are uniformly distributed along the axial direction of the barrel body 1; the surface of the anchor rod centering support block 5, which is in abutting contact with the fiber anchor rod 6, is provided with a concave arc surface structure; the screw sleeve 2 is of a cylindrical structure, external threads are arranged on the outer surface of the screw sleeve 2, the external threads on the outer surface of the screw sleeve 2 are in threaded connection with the internal threads on the inner surface of the barrel 1, and the length of the screw sleeve 2 is equal to that of the barrel 1; the number of the sealing covers 3 is two, and the two sealing covers 3 are respectively arranged at the cylinder openings at the two ends of the screw sleeve 2; and a glue solution inlet and outlet 7 is arranged on the sealing cover 3.

The difference between the diameter of the inner surface of the thread sleeve 2 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 and the thread sleeve 2 is at least 10 times of the diameter of the fiber anchor rod 6.

A fiber anchor rod connecting method adopts the threaded sleeve 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, a barrel body 1 is sleeved into a butt joint of fiber anchor rods 6 wound with three layers of fiber cloth after passing through any one fiber anchor rod 6, then a threaded sleeve 2 is sleeved into a threaded sleeve screwing gap of the barrel body 1 after passing through the fiber anchor rod 6 on one side of the free end of a spring steel sheet 4, the threaded sleeve 2 is screwed by a wrench, in the process that the threaded sleeve 2 is screwed into the barrel body 1, the inner surface of the threaded sleeve 2 can generate radial extrusion force on the spring steel sheet 4, and after the threaded sleeve 2 is completely screwed into the barrel body 1, the radial extrusion force of the inner surface of the threaded sleeve 2 on the spring steel sheet 4 can be finally converted into the radial pressure of an anchor rod centering supporting block 5;

step seven: the two sealing covers 3 are sleeved on the threaded sleeve 2 through two fiber anchor rods 6 respectively, wherein a glue solution inlet and outlet 7 on one sealing cover 3 is used as a glue injection port, and a glue solution inlet and outlet 7 on the other sealing cover 3 is used as a glue solution overflow port;

step eight: preparing two metal hoops, and temporarily fixing the two sealing covers 3 and the barrel 1 through the two metal hoops respectively;

step nine: preparing a glue injection hose, connecting the glue injection hose between a glue injection port of the sealing cover 3 and a prepared glue injection pump in a sealing manner, starting the glue injection pump, injecting epoxy resin glue 8 into the threaded sleeve 2 through the glue injection port of the sealing cover 3 until the epoxy resin glue 8 flows out from a glue solution overflow port of the sealing cover 3 on the other side, and indicating that the epoxy resin glue 8 is filled in a cavity between the threaded sleeve 2 and the fiber anchor rod 6;

step ten: and closing the glue injection pump, removing the glue injection hose, plugging the glue injection port and the glue solution overflow port until the epoxy resin glue 8 in the cavity between the thread sleeve 2 and the fiber anchor rod 6 is completely cured, and finally removing the two metal clamps for temporary fixation to finish 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 screw sleeve 2 is 300mm, the diameter of the inner surface of the screw sleeve 2 is 41mm, the wall thickness of the screw sleeve 2 is 3.5mm, the diameter of the outer surface of the screw sleeve 2 is 48mm, and the screw sleeve 2 is made of 65Mn steel; the length of the cylinder body 1 is 300mm, the diameter of the inner surface of the cylinder body 1 is 48mm, the wall thickness of the cylinder body 1 is 5mm, the diameter of the outer surface of the cylinder body 1 is 58mm, and the cylinder body 1 is made of 65Mn steel; the length of each spring steel sheet 4 is 300mm, the thickness of each spring steel sheet 4 is 0.5mm, 3 spring steel sheets 4 are arranged, each spring steel sheet 4 is provided with six anchor rod centering support blocks 5, and the total number of the anchor rod centering support blocks 5 is 18; the length of the single anchor rod centering support block 5 in the axial direction is 5mm, and the single anchor rod centering support block 5The local bearing area acting on the fiber anchor rod 6 is 300mm². When the fiber anchor rods are connected, the glue brushing length of each fiber anchor rod 6 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 torque applied by a wrench is controlled to be 1-1.5 kNm when the screw sleeve 2 is screwed, the type of the epoxy resin glue injected into the screw sleeve 2 is E20-HP, the glue injection time is controlled to be 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 thread insert pretension formula fibre stock connecting sleeve which characterized in that: comprises a cylinder body, a threaded sleeve and a sealing cover; the cylinder body is of a cylindrical structure, and internal threads are arranged on the inner surface of the cylinder body; a plurality of spring steel sheets are arranged on the inner side of the cylinder body and are parallel to the axis of the cylinder body, the plurality of spring steel sheets are uniformly distributed along the circumferential direction of the cylinder body, and the length of each spring steel sheet is equal to that of the cylinder body; one end of the spring steel sheet is fixedly connected with the opening of the barrel body, and the other end of the spring steel sheet is a free end; a threaded sleeve screwing clearance is formed between the spring steel sheet and the inner surface of the cylinder body, and the threaded sleeve screwing clearance is smaller than the wall thickness of the threaded sleeve; the surface of the spring steel sheet at the center side of the cylinder body is provided with a plurality of anchor rod centering support blocks, the number of the anchor rod centering support blocks is a plurality, and the anchor rod centering support blocks are uniformly distributed along the axis direction of the cylinder body; the surface of the anchor rod centering support block, which is in abutting contact with the fiber anchor rod, is provided with a concave arc surface structure; the barrel is of a cylindrical structure, external threads are arranged on the outer surface of the barrel, the external threads on the outer surface of the barrel are in threaded connection with the internal threads on the inner surface of the barrel, and the length of the barrel is equal to that of the barrel; the number of the sealing covers is two, and the two sealing covers are respectively arranged at the cylinder mouths at the two ends of the screw sleeve; and a glue solution inlet and outlet is formed in the sealing cover.

2. The thread insert pretensioning type fiber anchor rod connecting sleeve according to claim 1, wherein: the difference between the diameter of the inner surface of the thread sleeve and the diameter of the rod body of the fiber anchor rod is at least 10 mm.

3. The thread insert pretensioning type fiber anchor rod connecting sleeve according to claim 1, wherein: the length of the cylinder body and the thread sleeve is at least 10 times of the diameter of the fiber anchor rod body.

4. A fiber anchor rod connecting method using the thread insert pre-tightening type fiber anchor rod connecting sleeve according to claim 1, characterized by 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, a barrel is sleeved into a butt joint of fiber anchor rods wound with three layers of fiber cloth after passing through any one fiber anchor rod, then a threaded sleeve is sleeved into a threaded sleeve screwing gap of the barrel after passing through the fiber anchor rod on one side of the free end of a spring steel sheet, the threaded sleeve is screwed by a wrench, the inner surface of the threaded sleeve can generate radial extrusion force on the spring steel sheet in the process of screwing the threaded sleeve into the barrel, and after the threaded sleeve is completely screwed into the barrel, the radial extrusion force of the inner surface of the threaded sleeve on the spring steel sheet can be finally converted into the radial pressure of an anchor rod centering supporting block on the fiber anchor rod;

step seven: the two sealing covers are respectively sleeved on the screw sleeve through two fiber anchor rods, wherein a glue solution inlet and outlet on one sealing cover is used as a glue injection port, and a glue solution inlet and outlet on the other sealing cover is used as a glue solution overflow port;

step eight: preparing two metal hoops, and temporarily fixing the two sealing covers and the barrel body through the two metal hoops respectively;

step nine: preparing a glue injection hose, connecting the glue injection hose between a glue injection port of the sealing cover and a prepared glue injection pump in a sealing manner, starting the glue injection pump, injecting epoxy resin glue into the screw sleeve through the glue injection port of the sealing cover until the epoxy resin glue flows out from a glue solution overflow port of the sealing cover on the other side, and indicating that the epoxy resin glue is filled in a cavity between the screw sleeve and the fiber anchor rod;

step ten: and closing the glue injection pump, removing the glue injection hose, plugging the glue injection port and the glue solution overflow port until epoxy resin glue in the cavity between the thread sleeve and the fiber anchor rod is completely cured, and finally removing the two metal clamps for temporary fixation to finish the connection of the fiber anchor rod.

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