CN204357005U - Prestressed FRP rib tensioning and anchoring device - Google Patents

Abstract

The utility model discloses a tensioning and anchoring device for prestressed FRP tendons, comprising an anchoring device and a tensioning device. The anchoring device includes a sleeve, a limit nut and an anchor backing plate. The tensioning device includes a tensioning rod, Reaction force support and force application equipment; the anchor plate is connected with the stop nut, the sleeve is a hollow structure, the hollow part is a cylinder or a cone and the inside is filled with bonding resin for anchoring the FRP tendon, and the sleeve The outer surface of the cylinder is all provided with external threads, the limit nut is fixed on the sleeve through external threads, and the anchor pad is provided with a hole that allows the sleeve to pass through freely; the inner surface of the sleeve is provided with internal threads, The sleeve is directly connected to the tension rod through the internal thread, and the tension rod is provided with external thread or tapping treatment at the connection part with the sleeve, or the sleeve is connected with the tension rod through the connecting sleeve and the internal thread part is pressurized and screwed into the inner hexagonal stud. The utility model can be used not only for the reinforcement of existing structures, but also for the reinforcement of new structures.

Description

Prestressed FRP Tendon Tensile Anchorage Device

technical field

The utility model relates to a tensioning and anchoring device for prestressed FRP tendons, which is mainly (but not exclusively) used in the fields of reinforcement of existing structures and reinforcement of new structures.

Background technique

Traditional prestressing materials are mostly steel bars and steel strands, etc. Under the background that prestressing technology is becoming more and more common and its application fields are becoming more and more extensive, there are corresponding problems. The most prominent problem is the traditional prestressing. The material has disadvantages such as poor durability and poor corrosion resistance. The emergence of fiber reinforced composites (FRP) and its popularization and application in the field of civil engineering have greatly broadened the application fields of structural reinforcement and prestressing technology. Although a lot of related research has been carried out at home and abroad, the application of FRP bars in the field of prestressing has not been developed rapidly due to their own shortcomings such as low shear strength and not easy to bend. Therefore, it is particularly important to further develop the prestressed tension anchorage technology of FRP tendons.

Utility model content

The purpose of this utility model is to provide a tensioning and anchoring device for FRP tendons, which has the characteristics of convenient construction and maintenance, simple system, high bearing capacity, and low cost, and can easily realize the tensioning and/or anchoring of FRP tendons. This device also allows it to be retensioned during service.

The technical scheme adopted in the utility model is: a tensioning anchor device for prestressed FRP tendons, including an anchoring device for anchoring FRP tendons and a tensioning device for tensioning FRP tendons. Bit nuts and anchor pads, the tensioning device includes a tensioning rod, a counter-force foot and a force-applying device;

The anchor backing plate is connected with the stop nut, the sleeve is a hollow structure, the hollow part is a cylinder or a cone, and the inside is filled with bonding resin for anchoring the FRP tendons, and the outer surface of the sleeve is all provided with external threads. The limit nut is fixed on the sleeve through an external thread, and the anchor plate is provided with a hole that allows the sleeve to pass through freely;

The inner surface of the sleeve is provided with an internal thread, the sleeve is directly connected to the tension rod through the internal thread, and the tension rod is provided with an external thread or tapped at the connection part with the sleeve, or the sleeve is connected to the tension rod through a connecting sleeve and The internal thread part is screwed into the inner hexagonal stud under pressure;

One end of the tension rod is connected with the sleeve, and the other end is fixed on the force application device through a fixing nut and a backing plate, the force application device is connected with the reaction force support foot, and the reaction force support foot is installed on the anchor support plate.

Preferably, the inner threaded part of the sleeve, the connection part of the tension rod with the sleeve, and the inner hexagon stud are treated with a release agent.

Preferably, the tension rod is made of high-strength steel bar, finish-rolled steel bar or high-strength screw rod.

Preferably, the force applying device is a through-hole jack.

The sleeve of the utility model is not directly in contact with the anchor backing plate, thereby indirectly receiving force through the limit nut, which is connected to the sleeve to limit the position of the sleeve after tensioning the FRP tendon; the anchor backing plate in the The opening should be slightly larger than the sleeve, so as to allow the sleeve to pass freely in the hole; one end of the tension rod is connected to the sleeve, and the other end is fixed to the force application device so as to directly bear and transmit the pre-tension force; the tension rod When the pull rod is connected to the sleeve, it is directly screwed into the sleeve, and the screw-in time is before the bonding resin is cured, so that the bonding resin is more dense; the force applying device is connected with the sleeve through a tension rod for Apply traction to tension the FRP tendons.

The hollow part of the sleeve is a cylinder or a cone, and the inside is filled with bonding resin to anchor the FRP bars. The outer surface of the sleeve is all provided with external threads to fix the limit nut on the sleeve. The sleeve is connected to the tension rod. The internal thread is provided, and the internal thread part can be treated with a release agent, etc., so as to avoid being stained by the bonding resin, so as to allow secondary tension and timely control. The tension rod is provided with external thread or tapping treatment at the connection part with the sleeve, and the connection part of the tension rod can be treated with a release agent, so that it is easy to remove after the prestressing construction is completed. The connection between the tension rod and the sleeve can also be connected by a connecting sleeve, and at the same time, the inner threaded part of the sleeve end is screwed in and pressurized with a hexagon socket head stud treated with a release agent, and the screwing time is before the bonding resin is cured. To play the role of extrusion bonding resin.

The utility model has the advantages of convenient construction and maintenance, simple system, high bearing capacity and low cost, and can conveniently realize the tensioning and anchoring of FRP tendons; at the same time, the device can perform secondary tensioning, and also allows timely control and adjustment of the applied prestress . The utility model can be used not only for the reinforcement of existing structures, but also for the reinforcement of new structures.

Beneficial effects: Compared with the prior art, the prestressed FRP tendon tension anchoring device of the present invention has the following advantages:

1) When the tension rod is connected to the sleeve, it is directly screwed into the sleeve. The screwing time is before the bonding resin is cured, so as to pressurize the bonding resin, and its anchoring bearing capacity will be significantly improved; 2) Applying The tension equipment directly applies traction to the tension rod, the tension process is simple, no special equipment is needed, and the construction cost is low; 3) The prestressed FRP tendon tension anchor device of the present utility model can perform secondary tension, and also allows timely control and adjustment of pre-tensioning. The size of the stress, so the construction and maintenance are convenient.

Description of drawings

Fig. 1 is the structural representation of the prestressed FRP tendon tension anchoring device of the present invention;

Fig. 2 is the schematic diagram of the tension rod of the utility model;

Fig. 3 is a schematic diagram of the connecting sleeve connection between the tension rod and the sleeve of the utility model.

Description of the drawings: 1 is the FRP tendon, 2 is the sleeve, 3 is the limit nut, 4 is the anchor plate, 5 is the tension rod, 6 is the force application device, 7 is the reaction force support, 8 is the fixed nut, 9 For backing plate, 10 is connecting sleeve, and 11 is hexagon socket head bolt.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-3, a tensioning and anchoring device for prestressed FRP tendons includes an anchoring device for anchoring FRP tendons 1 and a tensioning device for tensioning FRP tendons 1, and the anchoring device includes a sleeve 2 , a limit nut 3 and an anchor pad 4, the tensioning device includes a tensioning rod 5, a reaction force brace 7 and a force application device 6;

The anchor backing plate 4 is connected with the stop nut 3, the sleeve 2 is a hollow structure, the hollow part is a cylinder or a cone and the inside is filled with bonding resin for anchoring the FRP rib 1, the outer surface of the sleeve 2 All are provided with external threads, the limit nut 3 is fixed on the sleeve 2 through external threads, the anchor plate 4 is provided with a hole that allows the sleeve 2 to pass through freely; the inner surface of the sleeve 2 is provided with internal threads , the sleeve 2 is directly connected to the tension rod 5 through the internal thread, and the tension rod 5 is provided with an external thread or tapping treatment at the connection part with the sleeve 2, or the sleeve 2 is connected with the tension rod 5 through the connecting sleeve 10 and the internal thread part is Pressurized and screwed into the inner hexagonal stud 11; one end of the tension rod 5 is connected with the sleeve 2, and the other end is fixed on the force application device 6 through the fixing nut 8 and the backing plate 9, and the force application device 6 is connected with the reaction force support foot 7 , The reaction force support foot 7 is installed on the anchor pad 4 .

The internal thread part of the sleeve 2, the connection part of the tension rod 5 with the sleeve 2, and the hexagon socket head stud 11 are treated with a release agent. The tension rod 5 adopts high-strength steel bars, finished-rolled steel bars or high-strength screw rods. The force applying device 6 is a through-hole jack.

It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (4)

1. A prestressed FRP tendon tensioning anchorage device, characterized in that: comprise an anchoring device for anchoring FRP tendons and a tensioning device for tensioning FRP tendons, and said anchoring device includes a sleeve, a stop nut and An anchor pad, the tensioning device includes a tensioning rod, a counter-force support foot and a force-applying device; The anchor backing plate is connected with the stop nut, the sleeve is a hollow structure, the hollow part is a cylinder or a cone, and the inside is filled with bonding resin for anchoring the FRP tendons, and the outer surface of the sleeve is all provided with external threads. The limit nut is fixed on the sleeve through an external thread, and the anchor plate is provided with a hole that allows the sleeve to pass through freely; The inner surface of the sleeve is provided with an internal thread, the sleeve is directly connected to the tension rod through the internal thread, and the tension rod is provided with an external thread or tapped at the connection part with the sleeve, or the sleeve is connected to the tension rod through a connecting sleeve and The internal thread part is screwed into the inner hexagonal stud under pressure; One end of the tension rod is connected with the sleeve, and the other end is fixed on the force application device through a fixing nut and a backing plate, the force application device is connected with the reaction force support foot, and the reaction force support foot is installed on the anchor support plate. 2. The tensioning and anchoring device for prestressed FRP tendons according to claim 1, characterized in that: the internal thread portion of the sleeve, the connection portion of the tension rod with the sleeve, and the inner hexagon stud are treated with a release agent. 3. The tensioning and anchoring device for prestressed FRP tendons according to claim 1, characterized in that: said tensioning rods are made of high-strength steel bars, precision-rolled steel bars or high-strength screw rods. 4. The tensioning and anchoring device for prestressed FRP tendons according to claim 1, characterized in that: the force applying device is a through-hole jack.