CN201714101U - Group anchor single-hole anchor withdrawing mechanism - Google Patents

Abstract

The utility model discloses a group anchor single-hole anchor retraction mechanism. The anchor retraction body is a cylindrical structure, and a clip exit hole and a steel strand perforation are arranged along the axis. The middle wall of the anchor retraction body is provided with a clip leakage hole. Six support blocks are evenly distributed along the circumference on the end surface of the anchor body withdrawing from the hole by the clip, and a concave arc-shaped groove is formed between two adjacent support blocks. When removing the anchor, the concave arc-shaped groove is opposite to the anchored clip in the adjacent anchor hole to avoid interference with the clip in the adjacent anchor hole. The six support blocks are directly in contact with the anchor plate. When pressing, the retracting anchor body is stable in force, good in force, and high in safety; at the same time, it also avoids damage to the retracting anchor body caused by extrusion with adjacent clips, prolongs the service life, and reduces the use cost.

Description

Group anchor single hole anchor retraction mechanism

technical field

The utility model relates to a device used for dismantling anchors after prestressed tensioning of reinforced concrete, in particular to a group anchor single hole anchor retraction mechanism.

Background technique

In the existing prestressed tensioning process, whether it is a single-hole anchor or a group of anchors, when slippage or tensioning occurs, a single-hole limiting plate and an anchor withdrawal mechanism must be used.

In the prior art, the structure of the single-hole anchor retraction mechanism is shown in Figure 1. The anchor retraction body 1a is a straight cylindrical structure, and the clip exit hole 2a and the steel strand perforation 3a are arranged along the axis. On the middle wall of the anchor retraction body 1a A clip leakage hole 4a is opened, and the clip leakage hole 4a communicates with the clip withdrawal hole 2a.

When using the single-hole anchor withdrawal mechanism to remove the anchor, the structure of the single-hole anchor withdrawal mechanism in use is shown in Figure 2 and Figure 3. The withdrawal of the clip 7a from the anchor hole 8a mainly depends on the jack to provide power, and the single-hole anchor withdrawal mechanism is installed between the outside of the clip 7a and the piston (not shown in the figure) of the jack. Pass the threaded steel strand 5a through the steel strand perforation 3a of the anchor body 1a, and then pass through the piston of the jack to connect with the jack. The clip 7a corresponds to the exit hole 2a of the clip, and the straight cylinder end is pressed on the adjacent two On the anchored clip 7a in the first anchor hole 8a, when the jack is started to apply pressure, the clip 7a withdraws from the anchor hole, enters the clip exit hole 2a, and falls out from the clip leakage hole 4a.

The single-hole anchor withdrawal mechanism of the above structure mainly has the following deficiencies in use: 1. The single-hole anchor withdrawal mechanism is a straight cylinder, and the end faces are pressed on the anchored clips 7a in two adjacent anchor holes 8a. The anchor plate 6a can only be pressed through the clip 7a, but not directly on the anchor plate 6a, which will cause the tooling of the single-hole anchor withdrawal mechanism to deviate, the pull force of the single-hole anchor withdrawal mechanism is too large, and the force of the single-hole anchor withdrawal mechanism is uneven. , easily lead to safety accidents; 2. When the single-hole anchor withdrawal mechanism transmits force through the clip 7a, the hardness of the clip 7a is much greater than the hardness of the single-hole anchor withdrawal mechanism, causing the end surface extruded by the adjacent clip 7a to be often The lack of pressure causes severe damage, resulting in a high replacement rate of the single-hole anchor withdrawal mechanism and high use costs.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the utility model provides a method that can avoid contact with the adjacent anchored clips when withdrawing the anchor, and directly apply pressure on the anchor plate, and the tooling is stable, does not deviate, and the force is uniform. Long service life, low cost of use group anchor single hole anchor retraction mechanism.

The utility model provides a group anchor single-hole anchor retraction mechanism. The anchor retraction body is a cylindrical structure, and a clip exit hole and a steel strand perforation are provided along the axis. A clip is opened on the middle wall of the anchor retraction body. Leakage hole, the clip leakage hole communicates with the clip exit hole; the end surface of the retracted anchor body near the clip exit hole is evenly distributed along the circumferential direction with six support blocks, and the inner circle formed by the six support blocks has a diameter of greater than 30mm, a concave arc-shaped groove is formed between the two adjacent support blocks, the center line of the arc surface of the concave arc-shaped groove is parallel to the axis of the anchor body, and the concave arc-shaped groove The distance between the center line of the arc surface and the axis of the anchor body is less than 32.5mm, and the arc radius of the concave arc groove is greater than 15mm.

Further, the cross-sectional outline of the support block is composed of three concave arc lines.

Further, the length of the six support blocks in the axial direction of the withdrawal anchor body is 9-12mm.

Compared with the prior art, the group anchor single hole anchor withdrawal mechanism of the utility model has the following advantages:

1. In the utility model, six support blocks are evenly distributed along the circumference on the end face of the retracting anchor body, and an inner concave arc-shaped groove is formed on the outer side between two adjacent support blocks. When installing, the inner concave arc-shaped groove and the adjacent The anchored clips in the anchor holes are corresponding to avoid interference with the clips in the adjacent anchor holes. The six support blocks can be fully supported on the anchor plate and directly exert pressure on the anchor plate. The anchor body is stable under force. Good strength and high safety.

2. At the same time, it also avoids damage to the anchor body caused by extrusion with adjacent clips when the anchor body is stressed, prolongs the service life and reduces the use cost.

3. The cross-sectional profile of the support block is composed of three concave arc lines, which not only ensures the strength of the support block itself, but also facilitates processing and low manufacturing cost.

Description of drawings

Fig. 1 is the structural representation of the single-hole anchor withdrawal mechanism in the prior art;

Fig. 2 is a cross-sectional view of the single-hole anchor withdrawal mechanism in use in the prior art;

Fig. 3 is a sectional view along the A-A direction in Fig. 2;

Fig. 4 is a structural schematic diagram of a group anchor single hole anchor withdrawal mechanism of the present invention;

Fig. 5 is a cross-sectional view of the group anchor single-hole anchor withdrawal mechanism in use;

Fig. 6 is a cross-sectional view along B-B direction in Fig. 5 .

Detailed ways

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

Fig. 4 is a structural schematic diagram of the group anchor single hole anchor withdrawal mechanism of the present invention, as shown in the figure. The anchor body 1 of the group anchor single-hole anchor retraction mechanism is a cylindrical structure, and a clip exit hole 2 and a steel strand perforation 3 are provided along the axis. The sheet leakage hole 4 communicates with the clip sheet exit hole 2 . There are six support blocks 5 evenly distributed along the circumference of the end face of the anchor body 1 that is withdrawn from the hole 2 by the clip. The diameter of the inner circle surrounded by the six support blocks is greater than 30mm. The diameter of the existing clip is larger than that of the existing clip. The clip moves freely in the inner circle surrounded by the six supporting blocks, which is beneficial for the clip to withdraw. A concave arc-shaped groove 6 is formed between two adjacent support blocks. The center line of the arc surface of the concave arc-shaped groove 6 is parallel to the axis of the anchor body 1, and the distance between the center line and the axis of the anchor body 1 is Less than 32.5mm, the arc radius of the concave arc groove 6 is greater than 15mm.

The length of the six support blocks 5 in the axial direction of the anchor body 1 is 9-12 mm. As far as the existing clip is concerned, the clip clamps the steel strand and inserts it into the anchor hole of the anchor plate, and then stays on the anchor plate. The length outside the end face is about 6mm. When using a jack to remove the clips and the remaining anchors, it can be ensured that the six support blocks 5 on the anchor body 1 are respectively stuck on the anchor plates between the clips in two adjacent anchor holes. If the length of the six support blocks 5 is too long, the distance of the clamps in the anchor hole is too long, the elongation of the steel strand increases when the anchor is withdrawn, the cross section of the steel strand becomes smaller, and broken wires or roots are formed, which is easy to lead to safety incidents.

After the reinforced concrete has been prestressed and stretched, when removing clips or other anchors, first install the anchor body 1 between the anchor plate 8 and the piston (not shown in the figure) of the jack, as shown in Figure 5 and Figure 5. 6. Pass the steel strand 7 through the steel strand perforation 3 on the anchor body 1, pass through the piston of the jack and be connected with the jack. The clips 9 correspond to the clip withdrawal holes 2 in the anchor withdrawal body 1 , and the six support blocks 5 are respectively stuck on the anchor plates 8 between the clips 9 in two adjacent anchor holes 10 . When the jack is started to remove clips 9 and other anchors, the piston rod of the jack is pressed against the other end of the anchor body 1, and the anchor body 1 directly transmits power to the anchor plate 8 through six support blocks 5 thereon. The steel strand 7 in the anchor hole 10 is pulled, driving the clip 9 to withdraw from the anchor hole 10, the clip 9 enters the clip exit hole 2, and leaks from the clip leakage hole 4, so as to achieve the purpose of removing the clip 9 Purpose.

Since the six support blocks 5 completely avoid the clamping positions in the adjacent anchor holes 10, six parts in a ring form contact with the anchor plate 8, which not only bears uniform force, but also does not interfere with other anchor holes to achieve normal single-hole tensioning . Because the center distance between each anchor hole and the adjacent anchor holes is always constant, the group anchor single hole anchor withdrawal mechanism is suitable for removing any anchor hole.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (3)

1. A group anchor single-hole anchor retraction mechanism, the anchor retraction body (1) is a cylindrical structure, with a clip exit hole (2) and a steel strand perforation (3) along the axis, the anchor retraction body ( 1) There is a clip leakage hole (4) on the middle wall of the clip, and the clip leakage hole (4) communicates with the clip exit hole (2); the feature is that the anchor withdrawal body (1) is close to the clip Six support blocks (5) are uniformly distributed along the circumference on the end surface of the exit hole (2), and the diameter of the inner circle surrounded by the six support blocks (5) is greater than 30 mm. A concave arc-shaped groove (6) is formed between them. The center line of the arc surface of the concave arc-shaped groove (6) is parallel to the axis of the anchor body (1), and the concave arc-shaped groove (6) The distance between the center line of the circular arc surface and the axis of the withdrawal anchor body (1) is less than 32.5 mm, and the arc radius of the concave arc groove (6) is greater than 15 mm. 2. The group anchor single-hole anchor withdrawal mechanism according to claim 1, characterized in that: the cross-sectional profile of the support block (5) is composed of three concave arc lines. 3. The group anchor single-hole anchor withdrawal mechanism according to claim 2, characterized in that: the length of the six support blocks (5) in the axial direction of the anchor withdrawal body (1) is 9-12mm .

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