A screw rod body type telescopic tension anchor rod

Abstract

The application discloses a screw rod body type telescopic tension-resistant anchor rod and relates to the technical field of anchoring, which comprises an anchor rod head, a screw rod connected with the anchor rod head, a straight rod connected with the screw rod, a reduced diameter sleeve sleeved outside the straight rod, and a slotted tension-resistant sleeve ring sleeved outside the reduced diameter sleeve; the reduced diameter sleeve comprises a first constant diameter section and a first reduced diameter section which are connected with each other; a first expansion nut matched in size is arranged at the connection position of the first constant diameter section and the first reduced diameter section; the inner diameter of the first reduced diameter section changes in a narrowing manner, and the slotted tension-resistant sleeve ring is sleeved outside the first reduced diameter section and is used for being forced to be opened when the first expansion nut moves into the first reduced diameter section; therefore, the scheme utilizes the screw rod to increase the bonding strength and the anti-slippage performance between the screw rod and the grouting body, utilizes the cooperation of the reduced diameter sleeve and the slotted tension-resistant sleeve ring, realizes the effects of preventing pulling and slippage failure and increasing the tension-resistant resistance, and thus practically solves the problem that the prior art is easily pulled and broken due to insufficient extension.

Description

Technical Field

[0001] This invention relates to the field of anchoring technology, and in particular to a spiral rod type telescopic tensile anchor. Background Technology

[0002] Deep surrounding rock is characterized by high geothermal temperature, high confining pressure, large deformation, and strong time effects. It is easily broken by the disturbance caused by engineering construction and resource mining, which leads to large deformation and failure. This poses a serious threat to the normal construction of the project, the effective mining of resources, and the safety of people's lives and property. Therefore, strengthening the effective support of deep surrounding rock is a key issue that urgently needs to be addressed in deep engineering construction and mineral resource mining.

[0003] Rock bolts are a widely used support method in underground engineering. To address the high stress and large deformation problems in deep rock masses, rock bolts must not only provide effective support force but also generate significant axial deformation to coordinate with the large deformation of the surrounding rock. However, traditional threaded steel bar rock bolts, when used in deep rock masses, often fail due to insufficient elongation, easily breaking and causing adverse effects on the engineering structure, seriously affecting its stability and safety.

[0004] Therefore, in order to address the problem of large deformation in deep surrounding rock, it is urgent to develop a tensile anchor bolt suitable for deep surrounding rock with stable resistance and large deformation performance, so as to effectively coordinate the deformation of surrounding rock, provide effective and stable support, and meet the support requirements of deep surrounding rock. Summary of the Invention

[0005] The purpose of this invention is to provide a spiral rod type telescopic tensile anchor rod to solve the problem that existing technologies are prone to breakage due to insufficient elongation.

[0006] To address the aforementioned technical problems, this invention provides a spiral rod type telescopic tensile anchor bolt, comprising an anchor head, a spiral rod connected to the anchor head, a straight rod connected to the spiral rod, a reduced-diameter sleeve fitted over the straight rod, and a slotted tensile collar fitted over the reduced-diameter sleeve; the reduced-diameter sleeve includes a first constant-diameter section and a first reduced-diameter section that are interconnected; the inner diameter of the first constant-diameter section is a constant value, and a first expansion nut is provided at the connection between the first constant-diameter section and the first reduced-diameter section, the outer diameter of the first expansion nut being the same as the inner diameter of the first constant-diameter section, and the first expansion nut being threaded... The connection is fitted over the straight rod; the port of the first constant diameter section is a sealed structure, and a compression post is provided inside the first constant diameter section near its port. The compression post is threaded to the end of the straight rod, and a preload spring is compressed between the compression post and the first expansion nut. The preload spring is fitted over the straight rod; from the first constant diameter section to the helical rod, the inner diameter of the first reduced diameter section narrows; the slotted tensile sleeve is fitted over the first reduced diameter section, and when the first expansion nut moves into the first reduced diameter section, the slotted tensile sleeve is used to be opened by force.

[0007] In one embodiment, the first constant diameter section is fitted with a seamless tensile collar, which includes a seamless collar and tensile flaps. The seamless collar is fitted over the first constant diameter section, and a plurality of tensile flaps are arranged around the periphery of the seamless collar.

[0008] In one embodiment, a second expansion nut is threaded onto the straight rod, the second expansion nut being disposed within the first reduced diameter section, and the outer diameter of the second expansion nut being smaller than the outer diameter of the first expansion nut.

[0009] In one embodiment, the reducing sleeve includes a first constant diameter section, a first reducing diameter section, a second constant diameter section, and a second reducing diameter section that are sequentially connected to each other; the inner diameter of the second constant diameter section is a constant value; the inner diameter of the second reducing diameter section narrows from the second constant diameter section toward the helical rod; the second expanding nut is disposed at the connection between the second constant diameter section and the second reducing diameter section, and the outer diameter of the second expanding nut is the same as the inner diameter of the second constant diameter section.

[0010] In one embodiment, the slotted tensile collar is also fitted over the second reduced diameter section.

[0011] In one embodiment, the slotted tensile collar is also fitted over the second constant diameter section.

[0012] In one embodiment, the anchor head includes a connecting rod, a head rubber washer, a spherical groove tray, and a preload nut. The connecting rod is integrally formed with the helical rod, and the connecting rod passes through the head rubber washer and the spherical groove tray in sequence before being threadedly connected to the preload nut.

[0013] In one embodiment, the port of the first constant diameter section is internally threaded with an end nut.

[0014] In one embodiment, the straight rod is further fitted with a first rubber washer and a second rubber washer, the first rubber washer being compressed between the first extension nut and the preload spring, and the second rubber washer being compressed between the preload spring and the compression column.

[0015] In one embodiment, the slotted tensile collar includes a slotted collar and slotted tensile winglets. The slotted collar has a straight groove through which it passes, and the straight groove extends along the axial direction of the slotted collar. The slotted collar is used to achieve a sleeve connection, and a plurality of slotted tensile winglets are arranged around the periphery of the slotted collar.

[0016] The beneficial effects of this invention are as follows:

[0017] First, because the present invention incorporates a helical rod, the helical structure of which effectively increases the contact area between the helical rod and the grout within a limited length, ensuring full contact between the two and guaranteeing that the grout fills all the gaps in the helical rod. This increases the bond strength and anti-slip performance between the helical rod and the grout. Moreover, in terms of deformation, the helical rod has greater elongation performance compared to ordinary straight anchor rods. It can cooperate with the surrounding rock in tensile and compressive deformation during the deformation of the surrounding rock, and generate a large tensile axial force during the deformation process, providing a tensile resistance effect.

[0018] Secondly, when the first expansion nut moves into the first reduced diameter section, the slotted tensile sleeve is used to expand under force. That is, when the anchor rod is subjected to a pull-out action, the straight rod inside the reduced diameter sleeve moves outward relative to the reduced diameter sleeve, thereby driving the first expansion nut into the first reduced diameter section. Under the force of the first expansion nut, the first reduced diameter section is subjected to a squeezing and expansion action. During this process, a tensile resistance will be generated between the straight rod and the reduced diameter sleeve. At the same time, the expanding first reduced diameter section will also expand the slotted tensile sleeve on its outer side, so that it is embedded in the grout layer or rock layer, which plays the role of preventing pull-out slippage failure and increasing the pull-out resistance.

[0019] Therefore, the interaction of the helical rod, the reduced-diameter sleeve, and the slotted tensile ring effectively solves the problem that existing technologies are prone to breakage due to insufficient elongation. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure provided in the first embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A side view diagram of the slotted tensile sleeve structure;

[0023] Figure 3 yes Figure 1 A top view of the slotted tensile collar structure;

[0024] Figure 4 This is a structural schematic diagram provided in the second embodiment of the present invention;

[0025] Figure 5 yes Figure 4 A side view schematic diagram of the seamless tensile collar structure;

[0026] Figure 6 yes Figure 4 A top view of the seamless tensile collar structure;

[0027] Figure 7 This is a partially enlarged structural schematic diagram provided in the third embodiment of the present invention;

[0028] Figure 8 This is a structural schematic diagram provided in the fourth embodiment of the present invention;

[0029] Figure 9 yes Figure 8 A magnified disassembly diagram of the X-section;

[0030] Figure 10 This is a partially enlarged structural schematic diagram provided in the fifth embodiment of the present invention.

[0031] The attached figures are labeled as follows:

[0032] 10. Anchor head; 11. Connecting rod; 12. Head rubber washer; 13. Spherical groove tray; 14. Preload nut;

[0033] 20. Screw rod;

[0034] 30. Straight rod;

[0035] 40. Reducing diameter sleeve; 411. First constant diameter section; 412. Second constant diameter section; 421. First reducing diameter section; 422. Second reducing diameter section; 431. First expansion nut; 432. Second expansion nut;

[0036] 50. Slit tensile collar; 51. Slit collar; 52. Slit tensile wing; 53. Straight groove seam;

[0037] 61. Extrusion column; 62. Preload spring; 63. End nut; 641. First rubber washer; 642. Second rubber washer;

[0038] 70. Seamless tensile collar; 71. Seamless collar; 72. Tensile winglets attached. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] Example 1

[0041] This invention provides a helical rod type telescopic tensile anchor bolt, the first embodiment of which is, for example... Figures 1 to 3 As shown, the device includes an anchor head 10, a spiral rod 20 connected to the anchor head 10, a straight rod 30 connected to the spiral rod 20, a reduced-diameter sleeve 40 fitted over the straight rod 30, and a slotted tensile collar 50 fitted over the reduced-diameter sleeve 40. The reduced-diameter sleeve 40 includes a first constant-diameter section 411 and a first reduced-diameter section 421 that are connected to each other. The inner diameter of the first constant-diameter section 411 is a constant value. A first expansion nut 431 is provided at the connection between the first constant-diameter section 411 and the first reduced-diameter section 421. The outer diameter of the first expansion nut 431 is the same as the inner diameter of the first constant-diameter section 411. The first expansion nut 431 is fitted over the straight rod 30 by a threaded connection. Outside the rod 30; the port of the first constant diameter section 411 is a sealed structure. Inside the first constant diameter section 411, near its port, there is a compression column 61. The compression column 61 is threaded to the end of the straight rod 30, and a preload spring 62 is compressed between the compression column 61 and the first expansion nut 431. The preload spring 62 is sleeved outside the straight rod 30. From the first constant diameter section 411 to the spiral rod 20, the inner diameter of the first reducing section 421 narrows. The slotted tensile collar 50 is sleeved outside the first reducing section 421. When the first expansion nut 431 moves into the first reducing section 421, the slotted tensile collar 50 is used to be opened by force.

[0042] by Figure 1 The direction shown is for reference. When applying the anchor rod, insert the spiral rod type telescopic tensile anchor rod slowly into the borehole from left to right. After it is properly placed, fill the borehole evenly with grout and install the anchor rod head 10 in place.

[0043] Specifically, to achieve the installation of the anchor head 10, such as Figure 1 As shown, in this embodiment, the preferred configuration of the anchor head 10 includes a connecting rod 11, a head rubber washer 12, a spherical groove tray 13, and a preload nut 14. The connecting rod 11 is integrally formed with the helical rod 20. The connecting rod 11 passes through the head rubber washer 12 and the spherical groove tray 13 in sequence and is then threadedly connected to the preload nut 14. Therefore, when installing the anchor head 10, the head rubber washer 12 can be placed in the shallow part of the rock borehole where the helical rod telescopic tensile anchor is located to block the grout and prevent it from overflowing. Then, the spherical groove tray 13 is placed in it so that it abuts against the head rubber washer 12. Finally, the preload nut 14 is screwed in to press it tightly onto the spherical groove tray 13, thereby completing the overall installation of the helical rod telescopic tensile anchor.

[0044] In addition, to achieve a seal at the end of the spiral rod-type telescopic tensile anchor, such as Figure 1 As shown, in this embodiment, the port of the first constant diameter section 411 is preferably connected with an end nut 63 by an internal thread. Therefore, when the end nut 63 is tightened with the internal thread of the port of the first constant diameter section 411, a sealing effect can be easily achieved, so as to effectively prevent the grout from entering the reduced diameter sleeve 40 during the grouting process, and play a role in protecting the sleeve structure and the anchor rod.

[0045] Furthermore, to enhance the internal sealing of the reduced-diameter sleeve 40, such as... Figure 1 As shown, in this embodiment, a first rubber washer 641 and a second rubber washer 642 are preferably provided on the outside of the straight rod 30. The first rubber washer 641 is compressed between the first expansion nut 431 and the preload spring 62, and the second rubber washer 642 is compressed between the preload spring 62 and the compression column 61. That is, through the elastic contact between the first rubber washer 641, the second rubber washer 642 and the inside of the reduced diameter sleeve 40, a stronger sealing and protection effect is achieved.

[0046] It should be noted that the spiral structure adopted by the spiral rod 20 can effectively increase the contact area between the spiral rod 20 and the grout within a limited length, thereby ensuring full contact between the two and ensuring that the grout fills all the gaps in the spiral rod 20, thus increasing the bond strength and anti-slip performance between the spiral rod 20 and the grout. Moreover, in terms of deformation, the spiral rod 20 has greater elongation performance than ordinary straight rod anchors, and can cooperate with the surrounding rock in tensile and compressive deformation during the deformation of the surrounding rock, and generate a large tensile axial force during the deformation of the surrounding rock, providing a tensile effect.

[0047] It should also be noted that in this embodiment, the inner diameter of the first constant diameter section 411 is equal to the maximum inner diameter of the first reduced diameter section 421, and the inner diameter of the remaining parts of the first reduced diameter section 421 is smaller than the inner diameter of the first constant diameter section 411. Therefore, when the anchor rod is subjected to a pull-out action, the straight rod 30 inside the reduced diameter sleeve 40 moves outward relative to the reduced diameter sleeve 40, thereby driving the first expansion nut 431 into the first reduced diameter section 421. Under the force of the first expansion nut 431, the first reduced diameter section 421 is subjected to a squeezing and expansion action. During this process, a tensile resistance will be generated between the straight rod 30 and the reduced diameter sleeve 40. At the same time, the expanding first reduced diameter section 421 will simultaneously expand its outer slotted tensile ring 50, so that it is embedded in the grout layer or rock layer, which plays the role of preventing pull-out slippage failure and increasing the pull-out resistance.

[0048] Specifically, such as Figures 1 to 3 As shown, the slotted tensile collar 50 of this embodiment includes a slotted collar 51 and slotted tensile winglets 52. The slotted collar 51 is provided with a straight groove 53 through which it passes. The straight groove 53 extends along the axial direction of the slotted collar 51. The slotted collar 51 is used to achieve sleeve connection. A plurality of slotted tensile winglets 52 are arranged around the periphery of the slotted collar 51.

[0049] With this configuration, the straight groove 53 is equivalent to cutting the complete collar, so that the open collar 51 can expand outward when subjected to radial force, and drive the tensile wing 52 of the collar to extend outward and embed into the grouting layer or rock layer, thereby achieving tensile resistance.

[0050] Example 2

[0051] A second embodiment of the invention, for example Figures 4 to 6 As shown, it is basically the same as the first embodiment, except that the first constant diameter section 411 in this embodiment is covered with a seamless tensile collar 70. The seamless tensile collar 70 includes a seamless collar 71 and tensile fins 72. The seamless collar 71 is fitted over the first constant diameter section 411, and multiple tensile fins 72 are arranged around the periphery of the seamless collar 71.

[0052] After adopting this setting method, since the tensile wing 72 is set outward, even if the seamless collar 71 does not produce expansion deformation, the tensile wing 72 can still be embedded into the grouting layer or rock layer by its own shape, which improves the effect of preventing pull-out slip failure and increasing pull-out resistance from another perspective.

[0053] Example 3

[0054] A third embodiment of the invention, for example Figure 7As shown, it is basically the same as the second embodiment, except that the straight rod 30 in this embodiment is threaded with a second expansion nut 432. The second expansion nut 432 is located inside the first diameter reduction section 421, and the outer diameter of the second expansion nut 432 is smaller than the outer diameter of the first expansion nut 431.

[0055] by Figure 7 The direction shown is for reference. After adopting this setting, once the straight rod 30 moves to the left, the first expansion nut 431 and the second expansion nut 432 will simultaneously enter the first reduced diameter section 421. That is, the first expansion nut 431 will enter the part with the larger inner diameter of the first reduced diameter section 421, while the second expansion nut 432 will enter the part with the smaller inner diameter of the first reduced diameter section 421. This will simultaneously push the first reduced diameter section 421 outward, ensuring that the first reduced diameter section 421 can be fully expanded, which provides a guarantee for full embedding into the grouting layer or rock layer.

[0056] Example 4

[0057] Fourth embodiment of the invention, for example Figure 8 and Figure 9 As shown, it is basically the same as the third embodiment, except that the reduced diameter sleeve 40 in this embodiment includes a first constant diameter section 411, a first reduced diameter section 421, a second constant diameter section 412, and a second reduced diameter section 422 that are connected to each other in sequence; the inner diameter of the second constant diameter section 412 is a constant value; from the second constant diameter section 412 toward the screw rod 20, the inner diameter of the second reduced diameter section 422 narrows; the second expansion nut 432 is provided at the connection between the second constant diameter section 412 and the second reduced diameter section 422, and the outer diameter of the second expansion nut 432 is the same as the inner diameter of the second constant diameter section 412; and the second reduced diameter section 422 is also fitted with a slotted tensile collar 50.

[0058] It should be noted that in this embodiment, the inner diameter of the first constant diameter section 411 is equal to the maximum inner diameter of the first narrow diameter section 421, and the inner diameters of the remaining parts of the first narrow diameter section 421 are all smaller than the inner diameter of the first constant diameter section 411. The minimum inner diameter of the first narrow diameter section 421 is equal to the inner diameter of the second constant diameter section 412, and the inner diameter of the second constant diameter section 412 is equal to the maximum inner diameter of the second narrow diameter section 422. The inner diameters of the remaining parts of the second narrow diameter section 422 are all smaller than the inner diameter of the second constant diameter section 412.

[0059] Therefore, after adopting this setting, if the spiral rod type telescopic tensile anchor rod is not subjected to a pull-out action, not only will the first expansion nut 431 not exert a radial force on the reduced diameter sleeve 40, but the second expansion nut 432 will also not exert a radial force on the reduced diameter sleeve 40, thereby avoiding the continuous application of force to the reduced diameter sleeve 40 under unnecessary circumstances, thus greatly improving the service life of the reduced diameter sleeve 40.

[0060] Example 5

[0061] Fifth embodiment of the invention, for example Figure 10 As shown, it is basically the same as the fourth embodiment, except that the second constant diameter section 412 in this embodiment is also fitted with a slotted tensile collar 50, so there will be a total of three slotted tensile collars 50 in this embodiment.

[0062] Therefore, after adopting this implementation method, the slotted tensile collar 50 can completely cover the parts of the reduced diameter sleeve 40 that may expand, so that when the reduced diameter sleeve 40 expands, the slotted tensile collar 50 can be embedded in the grouting layer or rock layer in a more comprehensive manner, so as to further improve the effect of preventing pull-out slip failure and increasing the pull-out resistance.

[0063] Based on the above embodiments, the installation steps for installing a helical rod type telescopic tensile anchor bolt are roughly as follows:

[0064] 1. Place the reduced-diameter sleeve 40 onto the straight rod 30 from right to left;

[0065] 2. Extend the straight rod 30 out of the reduced diameter sleeve 40, and then install the second expansion nut 432, the first expansion nut 431, the first rubber washer 641, the preload spring and the second rubber washer 642 in sequence, and tighten the first expansion nut 431 and the second expansion nut 432 to the preset position.

[0066] 3. Secure the extrusion column 61 to the end of the straight rod 30 using threaded connections;

[0067] 4. Move the reducing sleeve 40 to the right until the first expanding nut 431 abuts against the first reducing section 421 and the second expanding nut 432 abuts against the second reducing section 422, that is, move the reducing sleeve 40 to a state where it is difficult to move it to the right any further.

[0068] 5. Install the end nut 63 into the reduced diameter sleeve 40;

[0069] 6. The slotted tensile collar 50 and the seamless tensile collar 70 are fitted over the reduced diameter sleeve 40 from right to left. The slotted tensile collar 50 and the reduced diameter sleeve 40, as well as the seamless tensile collar 70 and the reduced diameter sleeve 40, are threaded connections.

[0070] 7. When drilling in rock mass, the hole diameter must be larger than the outer diameter of the spiral rod telescopic tensile anchor, and the hole length must be larger than the overall length of the spiral rod telescopic tensile anchor.

[0071] 8. with Figure 10 Using the indicated direction as a reference, slowly insert the spiral rod-type telescopic tensile anchor into the borehole from left to right.

[0072] 9. After evenly filling the borehole with grout, place the head rubber washer 12 into the shallow part of the rock borehole where the spiral rod telescopic tensile anchor is located to block the grout and prevent it from overflowing. Then, insert the spherical slotted tray 13 from the anchor tail so that it abuts against the head rubber washer 12. Finally, screw in the pre-tightening nut 14 to press it tightly onto the spherical slotted tray 13, thereby completing the overall installation of the spiral rod telescopic tensile anchor.

[0073] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A spiral rod type telescopic tensile anchor bolt, characterized in that, It includes an anchor head, a helical rod connected to the anchor head, a straight rod connected to the helical rod, a reduced-diameter sleeve fitted over the straight rod, and a slotted tensile collar fitted over the reduced-diameter sleeve; The reduced-diameter sleeve includes a first constant-diameter section and a first reduced-diameter section that are connected to each other. The inner diameter of the first constant diameter section is a constant value. A first expansion nut is provided at the connection between the first constant diameter section and the first reduced diameter section. The outer diameter of the first expansion nut is the same as the inner diameter of the first constant diameter section. The first expansion nut is threaded onto the straight rod. The port of the first constant diameter section is a sealed structure. A compression column is provided inside the first constant diameter section near its port. The compression column is threaded onto the end of the straight rod. A preload spring is compressed between the compression column and the first expansion nut. The preload spring is sleeved on the straight rod. From the first constant diameter section toward the screw rod, the inner diameter of the first reduced diameter section narrows. The slotted tensile collar is fitted over the first reduced diameter section; the slotted tensile collar includes a slotted collar and slotted tensile winglets, the slotted collar has a straight groove through which it passes, the straight groove extends along the axial direction of the slotted collar, the slotted collar is used to achieve fitting, and a plurality of slotted tensile winglets are arranged around the periphery of the slotted collar. When the spiral rod-type telescopic tensile anchor is under tension, the straight rod drives the first extension nut to move into the first reduced diameter section. When the first extension nut moves into the first reduced diameter section, the slotted tensile collar is used to be opened by force. Specifically, under the force of the first extension nut, the first reduced diameter section is subjected to compression and expansion and undergoes radial expansion, thereby opening the slotted tensile collar sleeved on it, so that the slotted tensile collar is embedded in the grouting layer or rock layer, thereby generating pull-out resistance.

2. The spiral rod type telescopic tensile anchor bolt according to claim 1, characterized in that, The first constant diameter section is covered with a seamless tensile collar, which includes a seamless collar and tensile fins. The seamless collar is fitted over the first constant diameter section, and a plurality of tensile fins are arranged around the periphery of the seamless collar.

3. The spiral rod type telescopic tensile anchor bolt according to claim 1, characterized in that, The reduced diameter sleeve includes a first constant diameter section, a first reduced diameter section, a second constant diameter section, and a second reduced diameter section that are connected to each other in sequence. The inner diameter of the second constant diameter section is a constant value; From the second constant diameter section toward the screw rod, the inner diameter of the second reduced diameter section narrows. The straight rod is threaded with a second expansion nut, which is located at the junction of the second constant diameter section and the second reduced diameter section. The outer diameter of the second expansion nut is the same as the inner diameter of the second constant diameter section.

4. The spiral rod type telescopic tensile anchor bolt according to claim 3, characterized in that, The second diameter reduction section is also fitted with the aforementioned slotted tensile collar.

5. The spiral rod type telescopic tensile anchor bolt according to claim 4, characterized in that, The second constant diameter section is also fitted with the aforementioned slotted tensile collar.

6. The spiral rod type telescopic tensile anchor bolt according to any one of claims 1 to 5, characterized in that, The anchor head includes a connecting rod, a head rubber washer, a spherical groove tray, and a preload nut. The connecting rod is integrally formed with the helical rod. The connecting rod passes through the head rubber washer and the spherical groove tray in sequence and is threadedly connected to the preload nut.

7. The spiral rod type telescopic tensile anchor bolt according to any one of claims 1 to 5, characterized in that, The first constant diameter section has an internal threaded connection to the end nut.

8. The spiral rod type telescopic tensile anchor bolt according to any one of claims 1 to 5, characterized in that, The straight rod is also fitted with a first rubber washer and a second rubber washer. The first rubber washer is compressed between the first expansion nut and the preload spring, and the second rubber washer is compressed between the preload spring and the compression column.

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