A terminal assembly for prestressed anchor cable recovery

Abstract

The present invention discloses an end head assembly for recovering prestressed anchor cables, comprising a steel strand and an end head, wherein the steel strand extends into the end head, the steel strand is provided with a positioning protrusion along the circumferential direction, and the end head is provided with at least two blocking parts along the circumferential direction, the blocking parts are used to block the positioning protrusion, and the diameter of the channel formed between the blocking parts is less than the sum of the thickness of the steel strand and the positioning protrusion. The present invention can realize the rapid recovery of prestressed anchor cables by setting the positioning protrusion and the blocking parts, improve the recovery rate of prestressed anchor cables, and has a simple operation process; by setting an elastic member between the steel strand and the end head, the steel strand can be prevented from sliding out of the end head in the non-recovery stage; by setting a limiting groove, the limiting effect on the steel strand can be strengthened in the stress-bearing stage of the anchor cable, and the loss of the bearing capacity of the anchor cable can be prevented; by setting a gradual clip, the force transmission can be realized in the stress-bearing stage of the prestressed anchor cable, and the bearing function of the end head assembly can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, in particular to an end head assembly for recovering a prestressed anchor cable. Background Art

[0002] Recyclable prestressed anchor cables have been increasingly used in urban construction due to their advantages of saving support costs, not forming underground garbage, and not occupying additional underground space for a long time. However, recyclable prestressed anchor cables also have the following disadvantages: 1. The recycling rate of most recyclable prestressed anchor cables is not high, and the unrecycled anchor cables will still occupy underground space and form underground garbage; 2. The recycling construction process of most recyclable prestressed anchor cables is complicated and the construction efficiency is relatively low. Summary of the invention

[0003] The purpose of the present invention is to provide a terminal assembly for recovering prestressed anchor cables in view of the problems in the prior art that the recovery rate of recoverable prestressed anchor cables is low and the recovery construction process is complicated.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A terminal assembly for recovering prestressed anchor cables comprises a steel strand and an terminal section, wherein the steel strand extends into the terminal section, the steel strand is provided with a positioning protrusion along the circumferential direction, and the terminal section is provided with at least two blocking sections along the circumferential direction, wherein the blocking sections are used to block the positioning protrusions, and the diameter of the channel formed between the blocking sections is smaller than the sum of the thicknesses of the steel strand and the positioning protrusions.

[0006] The steel strand is arranged in a hollow area of ​​the end portion, and the inner diameter of the hollow area without the blocking portion is greater than or equal to the sum of the thicknesses of the steel strand and the positioning protrusion, so that the steel strand with the positioning protrusion can extend into and out of the end portion.

[0007] During the stress-bearing stage of the prestressed anchor cable, the blocking part can block the positioning protrusion, thereby limiting the position of the steel strand, so that the steel strand is in a load-bearing state. When the prestressed anchor cable enters the recovery stage, the steel strand is rotated so that the positioning protrusion and the blocking part are offset from each other, and the blocking part no longer blocks the positioning protrusion and no longer plays a limiting role, so that the steel strand can be directly pulled out, realizing the rapid recovery of the prestressed anchor cable.

[0008] The present invention can realize the rapid recovery of the prestressed anchor cable by arranging the positioning protrusion and the blocking part, thereby improving the recovery rate of the prestressed anchor cable, and has a simple structure and a simple recovery operation process.

[0009] As a preferred solution of the present invention, the end portion is further provided with a limiting channel along the circumferential direction, the positioning protrusion is installed in the limiting channel, the limiting channel is provided with at least two limiting grooves and a connecting groove communicating with the limiting grooves along the circumferential direction, the limiting groove is adapted to the positioning protrusion, and a mortise and tenon structure is formed between the limiting groove and the positioning protrusion. The size of the connecting groove is larger than the size of the positioning protrusion, so that the positioning protrusion can smoothly pass through the connecting groove.

[0010] By setting the limit groove and forming a mortise and tenon structure between the limit groove and the positioning protrusion, the limit effect on the steel strand can be strengthened during the stress stage of the prestressed anchor cable to prevent the loss of the anchor cable's bearing capacity. When retrieving the anchor cable, it is only necessary to push the steel strand so that the positioning protrusion and the limit groove are offset, and then rotate the steel strand so that the positioning protrusion and the blocking part are offset from each other, and the steel strand can be directly pulled out.

[0011] As a preferred embodiment of the present invention, the steel strand is provided with at least two gradual clips along the circumferential direction, and a gradual channel is provided in the end head, and the gradual channel is provided with a first channel section and a second channel section along the circumferential direction. The diameter of the first channel section gradually decreases along the pulling-out direction of the steel strand, and the minimum diameter of the first channel section is less than the sum of the maximum thicknesses of the steel strand and the gradual clips, so that force transmission can be achieved in the stress-bearing stage of the prestressed anchor cable, and the load borne by the steel strand is transferred to the end head, and then to the stratum, so as to realize the bearing function of the end head assembly. The diameter of the second channel section remains unchanged along the pulling-out direction of the steel strand, and the diameter of the second channel section is greater than the sum of the maximum thicknesses of the steel strand and the gradual clips, so that in the recovery stage of the prestressed anchor cable, the steel strand can be pulled out through the second channel section.

[0012] As a preferred solution of the present invention, a regular channel is further provided in the end portion, the regular channel is located between the blocking portion and the gradual change channel, and the regular channel is connected to the gradual change channel, and the diameter of the regular channel is larger than the maximum diameter of the gradual change channel. By providing the regular channel, it is convenient to push and rotate the steel strand, thereby realizing the rapid recovery of the steel strand.

[0013] As a preferred solution of the present invention, the positioning protrusion and the gradient clip are both welded to the steel strand to ensure sufficient connection strength.

[0014] As a preferred solution of the present invention, the longitudinal center lines of the positioning protrusion and the gradient clip coincide with each other, which facilitates the rotation of the steel strand, staggers the positioning protrusion and the blocking portion, and staggers the gradient clip and the first channel section, making the recovery operation more convenient.

[0015] As a preferred solution of the present invention, the thickness of the positioning protrusion is less than the maximum thickness of the gradient clip.

[0016] As a preferred solution of the present invention, the number of the positioning protrusions and the number of the gradient clips are both two, and they are evenly distributed along the circumferential direction of the steel strand.

[0017] As a preferred solution of the present invention, an elastic member is provided in the limiting channel, which can effectively prevent the positioning protrusion on the steel strand from sliding out of the limiting groove or the blocking portion during the non-recycling stage.

[0018] As a preferred solution of the present invention, the elastic member is a spring, one end of the spring is connected to the end portion, and the other end of the spring is in contact with the steel strand.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] (1) By providing the positioning protrusion and the blocking part, the prestressed anchor cable can be quickly recovered, the recovery rate of the prestressed anchor cable can be improved, and the structure is simple and the recovery operation process is simple.

[0021] (2) By providing an elastic connection between the steel strand and the end portion, the steel strand can be effectively prevented from slipping out of the end portion during the non-recycling stage.

[0022] (3) By setting a limit groove and forming a mortise and tenon structure between the limit groove and the positioning protrusion, the limiting effect on the steel strand can be strengthened during the stress stage of the prestressed anchor cable, thereby preventing the anchor cable from losing its bearing capacity.

[0023] (4) By setting a gradient clip, force transmission can be achieved during the stress-bearing stage of the prestressed anchor cable, and the load borne by the steel strand can be transferred to the end head, and then to the stratum, thereby realizing the bearing function of the end head assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural longitudinal section of an end head assembly for prestressed anchor cable recovery according to the present invention during a stress-bearing stage.

[0025] Figure 2 yes Figure 1 AA section view.

[0026] Figure 3 yes Figure 1 BB cross-sectional view.

[0027] Figure 4 It is a schematic diagram of the longitudinal section of the structure of an end head assembly for recovering prestressed anchor cables according to the present invention during the recovery stage.

[0028] Figure 5 yes Figure 4 CC cross-sectional view.

[0029] Figure 6yes Figure 4 DD cross-sectional view.

[0030] Icons: 1-steel strand, 2-steel strand protection cover, 3-carrying body, 4-gradual channel, 41-first channel section, 42-second channel section, 5-gradual clip, 6-regular channel, 7-blocking part, 8-positioning protrusion, 9-limiting channel, 91-limiting groove, 92-connecting groove, 10-spring, 11-limiting rod, 12-limiting baffle, 13-grouting pipe. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Example 1

[0034] like Figure 1-Figure 3 As shown, a terminal assembly for prestressed anchor cable recovery includes a steel strand 1 and a terminal section, wherein the steel strand 1 extends into the terminal section. The steel strand 1 is arranged in a hollow area of ​​the terminal section, and a blocking portion 7 is provided at a part of the hollow area, and the inner diameter of the hollow area without the blocking portion 7 is greater than or equal to the sum of the thickness of the steel strand 1 and the positioning protrusion 8, so that the steel strand 1 provided with the positioning protrusion 8 can extend into and out of the terminal section.

[0035] The end portion is provided with a limiting channel 9 along the circumferential direction, and a spring 10 is installed in the limiting channel 9, one end of the spring 10 is in contact with or connected to the end portion, and the other end is in contact with the steel strand 1. The steel strand 1 is provided with two positioning protrusions 8 along the circumferential direction, and the positioning protrusions 8 are located in the limiting channel 9. Correspondingly, the limiting channel 9 is provided with two limiting grooves 91 along the circumferential direction and a connecting groove 92 connecting the two limiting grooves 91, and the limiting groove 91 matches the size of the positioning protrusion 8, and a mortise and tenon structure is formed between the limiting groove 91 and the positioning protrusion 8 in the anchor cable force-bearing stage, and the size of the connecting groove 92 is larger than the size of the positioning protrusion 8, that is, in the anchor cable recovery stage, the positioning protrusion 8 can smoothly pass through the connecting groove 92. At the same time, two blocking parts 7 are provided along the annular direction at the end of the limiting channel 9, and the diameter of the channel formed between the blocking parts 7 is smaller than the sum of the thicknesses of the steel strand 1 and the two positioning protrusions 8, so that the blocking parts 7 can block the positioning protrusions 8 during the anchor cable stress stage. During the anchor cable recovery stage, by rotating the steel strand 1 so that the positioning protrusions 8 and the blocking parts 7 are offset from each other, the sum of the thicknesses of the steel strand 1 and the positioning protrusions 8 is smaller than the diameter of the limiting channel 9, so that the steel strand 1 can be pulled out of the limiting channel 9.

[0036] Furthermore, a regular channel 6 and a gradual channel 4 are provided in the end portion, and the regular channel 6 and the gradual channel 4 are connected to each other. The steel strand 1 is provided with two gradual clips 5 along the annular direction, and the diameter of the gradual clip 5 gradually decreases along the axial direction. Specifically, the diameter of the gradual clip 5 gradually decreases along the pulling direction of the steel strand 1.

[0037] The gradual channel 4 is provided with four arc segments along the circumferential direction, including two first channel segments 41 and two second channel segments 42. The diameter of the first channel segment 41 gradually decreases along the axial direction. Specifically, the diameter of the first channel segment 41 gradually decreases along the pulling-out direction of the steel strand 1. The minimum diameter of the first channel segment 41 is less than the sum of the maximum thicknesses of the steel strand 1 and the gradual clip 5. The diameter of the second channel segment 42 remains unchanged along the axial direction. Specifically, the diameter of the second channel segment 42 remains unchanged along the pulling-out direction of the steel strand 1, and the diameter of the second channel segment 42 is greater than the sum of the maximum thicknesses of the steel strand 1 and the gradual clip 5.

[0038] The regular channel 6 is located between the blocking portion 7 and the gradual channel 4 , and the diameter of the regular channel 6 is greater than the maximum diameter of the gradual channel 4 .

[0039] The longitudinal center lines of the positioning protrusion 8 and the gradient clip 5 coincide with each other, the thickness of the positioning protrusion 8 is less than the maximum thickness of the gradient clip 5, the positioning protrusion 8 and the gradient clip 5 are both welded to the steel strand 1, and are evenly distributed along the circumferential direction of the steel strand 1.

[0040] A bearing body 3 may be provided at one end of the end head, and the bearing body 3 is connected to the steel strand protective sleeve 2. The bearing body 3 mainly plays the role of converting the tension in the prestressed anchor cable into pressure and transmitting it to the cement slurry and surrounding strata outside the bearing body 3. A limit rod 11 may be provided at the other end of the end head assembly, a limit baffle 12 is provided at the end of the limit rod 11, and a grouting pipe 13 is provided.

[0041] like Figure 1-Figure 3 As shown, in the stress-bearing stage of the prestressed anchor cable, the limiting groove 91 and the positioning protrusion 8 form a mortise and tenon structure to limit the axial and circumferential position of the steel strand 1. At the same time, the blocking portion 7 further limits the axial displacement of the positioning protrusion 8, that is, limits the axial position of the steel strand 1, so that the steel strand 1 can be stuck in the end portion to play a bearing function. At the same time, the gradient clip 5 and the first channel section 41 fit tightly together, so that the load borne by the steel strand 1 can be transferred to the end portion, and then to the formation, realizing force transmission.

[0042] like Figure 4-Figure 6 As shown, in the prestressed anchor cable recovery stage, the spring 10 is first pushed inward so that the positioning protrusion 8 slides out of the limiting groove 91, and then the steel strand 1 is rotated so that the positioning protrusion 8 and the blocking portion 7 are staggered from each other, the positioning protrusion 8 enters the connecting groove 92, the gradient clip 5 and the first channel section 41 are staggered from each other, and the gradient clip 5 enters the second channel section 42, so that the steel strand 1 can be directly pulled out to achieve rapid recovery of the prestressed anchor cable.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A terminal assembly for prestressed anchor cable recovery, characterized in that: The invention comprises a steel strand (1) and an end portion, wherein the steel strand (1) extends into the end portion, the steel strand (1) is provided with a positioning protrusion (8) along the circumferential direction, and the end portion is provided with at least two blocking portions (7) along the circumferential direction, wherein the blocking portions (7) are used to block the positioning protrusion (8), and the diameter of the channel formed between the blocking portions (7) is smaller than the sum of the thicknesses of the steel strand (1) and the positioning protrusion (8); The end portion is also provided with a limiting channel (9) along the circumferential direction, the positioning protrusion (8) is installed in the limiting channel (9), the limiting channel (9) is provided with at least two limiting grooves (91) along the circumferential direction and a connecting groove (92) connected to the limiting grooves (91), the limiting grooves (91) are adapted to the positioning protrusion (8), and a mortise and tenon structure is formed between the limiting grooves (91) and the positioning protrusion (8); The positioning protrusion (8) is welded to the steel strand (1); the size of the connection groove (92) is larger than the size of the positioning protrusion (8); During the anchor cable recovery phase, the steel strand (1) is rotated so that the positioning protrusion (8) and the blocking portion (7) are offset from each other. The sum of the thicknesses of the steel strand (1) and the positioning protrusion (8) is smaller than the diameter of the limiting channel (9), so that the steel strand can be pulled out of the limiting channel (9).

2. The end head assembly for prestressed anchor cable recovery according to claim 1, characterized in that: The steel strand (1) is provided with at least two gradual clips (5) along the circumferential direction, the end portion is provided with a gradual channel (4), the gradual channel (4) is provided with a first channel section (41) and a second channel section (42) along the circumferential direction, the diameter of the first channel section (41) gradually decreases along the direction in which the steel strand (1) is pulled out, the minimum diameter of the first channel section (41) is smaller than the sum of the maximum thicknesses of the steel strand (1) and the gradual clip (5), the diameter of the second channel section (42) remains unchanged along the direction in which the steel strand (1) is pulled out, and the diameter of the second channel section (42) is larger than the sum of the maximum thicknesses of the steel strand (1) and the gradual clip (5); The gradient clip (5) is connected to the steel strand (1) by welding; The longitudinal center lines of the positioning protrusion (8) and the gradient clip (5) coincide with each other; The thickness of the positioning protrusion (8) is less than the maximum thickness of the gradient clip (5); During the anchor cable recovery phase, the positioning protrusion (8) enters the connecting groove (92), the gradient clip (5) and the first channel section (41) are staggered, and the gradient clip (5) enters the second channel section (42), thereby pulling out the steel strand (1) to achieve recovery of the prestressed anchor cable.

3. The end head assembly for prestressed anchor cable recovery according to claim 2, characterized in that: A regular channel (6) is also provided in the end portion, the regular channel (6) is located between the blocking portion (7) and the gradual channel (4), and the regular channel (6) is connected to the gradual channel (4), and the diameter of the regular channel (6) is greater than the maximum diameter of the gradual channel (4).

4. The end head assembly for recovering prestressed anchor cable according to claim 2, characterized in that: The number of the positioning protrusions (8) and the number of the gradient clips (5) are both two, and they are evenly distributed along the circumferential direction of the steel strand (1).

5. A terminal assembly for recovering prestressed anchor cables according to any one of claims 1 to 4, characterized in that: An elastic member is arranged in the limiting channel (9).

6. The end head assembly for recovering prestressed anchor cable according to claim 5, characterized in that: The elastic member is a spring (10), one end of the spring (10) is connected to the end portion, and the other end is in contact with the steel strand (1).

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