Tool for pressing extrusion head close to base plate

Abstract

The utility model belongs to the technical field of prestress tension anchorage devices, and particularly relates to a tool with an extrusion head attached to a base plate, which comprises the extrusion head, an anchor base plate, an extrusion plate and a tension bolt, the extrusion head is located between the anchor base plate and the extrusion plate, and a first through hole for a steel strand to penetrate through and a second through hole for the tension bolt to penetrate through are formed in the extrusion plate. The diameter of the first through hole is smaller than the outer diameter of the extrusion head, a connecting cylinder is arranged on the side wall, facing the extrusion plate, of the anchor bearing plate, one end of the tension bolt is connected into the connecting cylinder in a threaded mode, and the other end of the tension bolt can abut against the side wall, away from the extrusion head, of the extrusion plate. According to the utility model, the tension bolt penetrates through the second through hole in the extrusion plate and then is in threaded connection with the connecting cylinder on the anchor backing plate, so that extrusion force is applied to the extrusion head, the extrusion head is enabled to abut against the anchor backing plate, and the problem of looseness between the anchor backing plate and the extrusion head is solved. In addition, no hole is additionally formed in the anchor bearing plate, and the service life of the P-type face is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of prestressed tension anchors, and in particular relates to a tooling for an extrusion head to be close to a pad. Background Art

[0002] Anchor refers to the permanent anchoring device used in prestressed concrete. It is an anchoring tool used in post-tensioned structures or components to maintain the tension of prestressed tendons and transfer it to the interior of concrete. It is also called prestressed anchor. Among them, P-type anchors usually include steel strands, anchor pads, extrusion heads, bellows, restraint rings and spiral tendons. The anchor pads are provided with mounting holes for the steel strands to pass through. During the construction process, the steel strands, anchor pads, extrusion sleeves, bellows, restraint rings and spiral tendons are assembled in a certain order, and then the extrusion sleeves are extruded by special machines, so that the extrusion sleeves are plastically deformed to become extrusion heads. The extrusion heads hold the steel strands, and the outer diameter of the extrusion heads is larger than the aperture of the mounting hole on the anchor pads. In this way, the force on the steel strands is transmitted from the anchor pads to the components through the extrusion heads.

[0003] At present, in traditional P-type anchors, there is no reliable connection between the anchor plate and the extrusion head, and it cannot be guaranteed that the extrusion head is closely attached to the anchor plate. That is, the extrusion head and the anchor plate are loose, which cannot meet the purpose of close fitting in the specification and may bring serious quality consequences. Utility Model Content

[0004] The utility model aims to provide an extrusion head close to a pad tooling to solve the problem of looseness between the anchor pad and the extrusion head in a P-type anchor.

[0005] In order to achieve the above-mentioned purpose, the scheme of the utility model is as follows: the extrusion head is close to the pad tooling, including an extrusion head and an anchor pad, and also including an extrusion plate and a tightening bolt. The extrusion head is located between the anchor pad and the extrusion plate. The extrusion plate is provided with a first through hole for the steel strand to pass through and a second through hole for the tightening bolt to pass through. The aperture of the first through hole is smaller than the outer diameter of the extrusion head. A connecting tube is provided on the side wall of the anchor pad facing the extrusion plate. One end of the tightening bolt is threadedly connected in the connecting tube, and the other end of the tightening bolt can be abutted against a side wall of the extrusion plate away from the extrusion head.

[0006] The working principle and beneficial effects of this solution are as follows: in this solution, the tension bolt passes through the second through hole on the extrusion plate and is threadedly connected to the connecting tube, so that the extrusion plate applies an extrusion force to the extrusion head, and then the extrusion head and the anchor plate are pressed tightly together, solving the problem of looseness between the anchor plate and the extrusion head, and realizing the constraint of the anchor plate and the extrusion head. In addition, in this solution, no additional holes are opened on the anchor plate for the tension bolt to pass through, so that the anchor plate will not cause the force performance to decrease due to the additional holes, thereby ensuring the service life of the P-type anchor.

[0007] Optionally, a limiting cylinder for the extrusion head to penetrate is provided on one side wall of the extrusion plate facing the anchor plate, and the extrusion head and the limiting cylinder are clearance-matched.

[0008] In this solution, when the extrusion plate applies extrusion pressure to the extrusion head, the end of the extrusion head away from the anchor plate penetrates into the limiting cylinder. In this way, this solution can not only apply axial extrusion force to the extrusion head so that it is close to the anchor plate, but also limit the extrusion head in the radial direction of the extrusion head. In this way, the force exerted on the steel strand can be transmitted to the limiting cylinder and the extrusion plate through the extrusion head, so that the extrusion plate and the anchor plate share the load together.

[0009] Optionally, the inner diameter of the limiting cylinder is equal to the outer diameter of the extrusion head.

[0010] In this solution, the inner peripheral wall of the limiting cylinder contacts the outer peripheral wall of the extrusion head, and the load on the extrusion head can be immediately transferred to the limiting cylinder.

[0011] Optionally, the connecting tube and the anchor plate are formed integrally.

[0012] In this solution, when the connecting tube and the anchor plate are integrally formed, the connecting tube and the anchor plate have good integrity. Compared with welding the connecting tube to the anchor plate, this solution has a longer service life.

[0013] Optionally, the limiting cylinder is integrally formed with the extrusion plate.

[0014] In this solution, when the limiting cylinder and the extrusion plate are integrally formed, the limiting cylinder and the extrusion plate have good integrity. Compared with welding the limiting cylinder to the extrusion plate, the service life of this solution is longer.

[0015] Optionally, the extruded plate is a square or circular steel plate.

[0016] In this solution, when the extruded plate is a steel plate, it has good stress resistance and is not easily damaged.

[0017] Optionally, the connecting tube is located at the center of the anchor plate, and the second through hole is located at the center of the extrusion plate.

[0018] In this solution, when the tension bolt is threadedly connected to the connecting tube, a tensioning force is applied to the center of the anchor plate and the extrusion plate, so that the forces on the anchor plate and the extrusion plate are balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the extrusion head close to the backing plate tooling in the first embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure when the extrusion plate and the tension bolts in the first embodiment of the utility model are disassembled;

[0021] Figure 3It is a schematic diagram of the structure of the extrusion head close to the pad tooling in the second embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The marks in the drawings of the specification include: bellows 1, spiral ribs 2, restraining rings 3, slurry outlet pipes 4, anchor pads 5, extrusion heads 6, steel strands 7, extrusion plates 8, first through holes 801, second through holes 802, tensioning bolts 9, connecting tubes 10, and limiting tubes 11.

[0024] Embodiment 1

[0025] This embodiment is basically Figure 1 and Figure 2 As shown: the P-type anchor includes a corrugated pipe 1, a spiral rib 2, a constraint ring 3, a slurry outlet pipe 4, an anchor pad 5, an extrusion head 6 and a steel strand 7. The extrusion head in this embodiment is close to the pad tooling, including an extrusion head 6, an anchor pad 5, an extrusion plate 8 and a tension bolt 9. The extrusion head 6 is located between the anchor pad 5 and the extrusion plate 8. The extrusion plate 8 is a square or round steel plate, and the thickness of the extrusion plate 8 is 5-6mm. In this example, the extrusion plate 8 is a round steel plate, and the thickness of the extrusion plate 8 is 5.5mm. The extrusion plate 8 is provided with a first through hole 801 for the steel strand 7 to pass through and a second through hole 802 for the tension bolt 9 to pass through. The aperture of the first through hole 801 is smaller than the outer diameter of the extrusion head 6. A connecting tube 10 is integrally formed on the right side wall of the anchor plate 5, and the left end of the tension bolt 9 is threadedly connected in the connecting tube 10 (i.e., an internal thread matching the thread of the tension bolt 9 is provided on the inner peripheral wall of the connecting tube 10), and the right end of the tension bolt 9 can abut against the right side wall of the extrusion plate 8. In addition, the connecting tube 10 is located at the center of the anchor plate 5, and the second through hole 802 is located at the center of the extrusion plate 8.

[0026] When in use, the worker fixes the anchor plate 5 with one hand and makes the anchor plate 5 butt against the left end of the extrusion head 6, and the worker turns the tension bolt 9 clockwise with the other hand. Since the left end of the tension bolt 9 can be threadedly connected with the connecting tube 10, the tension bolt 9 moves to the left as a whole, thereby driving the extrusion plate 8 to move to the left. The extrusion plate 8 butts against the right end of the extrusion head 6 and applies a leftward pressing force to the extrusion head 6, so that the extrusion head 6 and the anchor plate 5 are pressed tightly, solving the problem of looseness between the anchor plate 5 and the extrusion head 6, realizing the constraint of the anchor plate 5 and the extrusion head 6, and ensuring that the installation distance between the anchor plate 5 and the constraint ring 3 meets the installation technical requirements. Moreover, in this embodiment, no additional holes are opened on the anchor plate 5, and the anchor plate 5 will not cause the force performance to decrease due to the additional holes, thereby ensuring the service life of the P-type anchor.

[0027] Embodiment 2

[0028] The difference between this embodiment and the first embodiment is that: Figure 3 As shown, in this embodiment, a limiting cylinder 11 is integrally formed on the left side wall of the extrusion plate 8 for the left end of the extrusion head 6 to penetrate into, the number of the limiting cylinders 11 is the same as the number of the extrusion heads 6, the limiting cylinders 11 correspond to the extrusion heads 6 one by one, and the extrusion heads 6 and the limiting cylinders 11 are clearance-matched. In this embodiment, the inner diameter of the limiting cylinder 11 is equal to the outer diameter of the extrusion head 6.

[0029] In the present embodiment, when the extrusion plate 8 moves to the left under the action of the tightening bolt 9, the right end of the extrusion head 6 penetrates into the corresponding limiting cylinder 11. Thus, when the extrusion head 6 is pressed tightly between the anchor plate 5 and the extrusion plate 8, the extrusion head 6 is subjected to the extrusion force in the axial direction and pressed tightly against the anchor plate 5. In the radial direction, the extrusion head 6 is limited by the limiting cylinder 11. Thus, the force exerted on the steel strand 7 can be transmitted to the limiting cylinder 11 and the extrusion plate 8 through the extrusion head 6, thereby increasing the bearing capacity of the P-type anchor.

[0030] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the utility model. The specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. The extrusion head is close to the pad tooling, including the extrusion head and the anchor pad, and is characterized by: It also includes an extrusion plate and a tightening bolt, the extrusion head is located between the anchor plate and the extrusion plate, the extrusion plate is provided with a first through hole for the steel strand to pass through and a second through hole for the tightening bolt to pass through, the aperture of the first through hole is smaller than the outer diameter of the extrusion head, a connecting tube is provided on the side wall of the anchor plate facing the extrusion plate, one end of the tightening bolt is threadedly connected in the connecting tube, and the other end of the tightening bolt can be abutted against a side wall of the extrusion plate away from the extrusion head; a limiting tube for the extrusion head to penetrate into is provided on the side wall of the extrusion plate facing the anchor plate, and the extrusion head and the limiting tube are clearance-matched.

2. The extrusion head close to the backing plate tooling according to claim 1 is characterized in that: The inner diameter of the limiting cylinder is equal to the outer diameter of the extrusion head.

3. The extrusion head close to the pad tooling according to claim 1, characterized in that: The connecting tube and the anchor plate are integrally formed.

4. The extrusion head close to the pad tooling according to claim 1, characterized in that: The limiting cylinder and the extrusion plate are integrally formed.

5. The extrusion head close to the pad tooling according to claim 1, characterized in that: The extruded plate is a square or circular steel plate.

6. The extrusion head close to the backing plate tool according to claim 1, characterized in that: The connecting tube is located at the center of the anchor plate, and the second through hole is located at the center of the extrusion plate.

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