A recoverable bolt with end grouting anchorage

Abstract

The present invention discloses an end-grouting anchored retrievable bolt, which includes a nut, a bolt support, a bolt support anchoring leg, a plum blossom camshaft, an embedded shaft, a thread, an anchor head, a bolt, a grouting pipe, an expansion head, a blade, a drill bit, a spiral rib, an expansion head connecting cylinder, a concave spline lock stop push rod, a ball bearing support, a ball bearing, an inner pin bolt, a magnet, a plum blossom cam, an opening in the concave head spline shaft, a concave head spline shaft, and a concave spline lock stop. The beneficial effects of the present invention are as follows: The expansion head can continue to drill into the soil under the drive of the embedded shaft to drive the concave head spline shaft to rotate. The spiral rib on the drill bit enables the drill bit to easily drill in. The blade can rotate to cut the soil to form a broken zone, and pressure grouting is used to reinforce the broken zone to form an end expansion head, achieving a better anchoring effect. The separation between the embedded shaft and the concave head spline shaft is achieved through the action of the plum blossom cam, facilitating the later extraction of the retrievable bolt.

Description

Technical Field

[0001] The present invention relates to an end-grouting recoverable bolt, specifically an end-grouting anchored recoverable bolt, belonging to the field of geotechnical engineering support structures. Background Technique

[0002] In the fields of geotechnical excavation support or landslide protection, affected by the excavation method and the excavation process, the geotechnical stress on the excavation surface will be redistributed, resulting in weak geotechnical parts such as weak structural planes, which will have a certain impact on subsequent construction and the normal use of buildings and structures. At present, bolt support can effectively restrain the deformation of the surrounding geotechnical mass of the excavation surface. At the same time, the use of bolts as a support form has the characteristics of effectively saving costs, simple construction, and small working face required for construction, and is widely used in various projects of permanent or temporary support of geotechnical masses. At present, many bolts are provided with a device similar to an umbrella frame structure at the rod end to increase the contact surface between the bolt and the surrounding soil, thereby enhancing the support effect of the bolt. However, this device is not conducive to the recovery of the bolt rod body, or some special means are used to recover the bolt accordingly. For example, the patent publication number is CN113944159A, and the patent name is a recoverable electromagnetic bolt and its construction method. This method is relatively complex through electromagnetic force transmission and is not conducive to large-scale use. Summary of the Invention

[0003] The purpose of the present invention is to provide an end-grouting anchored recoverable bolt to solve the above problems.

[0004] The present invention realizes the above object through the following technical solutions: An end grouting and anchoring recoverable bolt, comprising a nut, a bolt support, a bolt support anchoring leg, a plum blossom camshaft, an inner embedded shaft, a thread, an anchor head, a bolt, a grouting pipe, an expansion head, a blade, a drill bit, a spiral rib, an expansion head connecting cylinder, a concave spline lock stop push rod, a ball bearing support, a ball bearing, an inner pin bolt, a magnet, a plum blossom cam, an inner opening in the concave head spline shaft, a concave head spline shaft and a concave spline lock stop; An anchor head is fixed at the top end of the end recoverable bolt, a drill bit is fixed at one end of the bolt, spiral ribs are evenly arranged on the drill bit, one end of the expansion head is fixed to the drill bit, and the other end is rigidly connected to the expansion head connecting cylinder, blades are evenly arranged on the expansion head, the expansion head connecting cylinder is embedded in the bolt, an anchoring leg of the bolt support is arranged on one side of the bolt support, the bolt support is installed on the anchor head, the nut is installed on the anchor head through a thread, a grouting pipe is arranged inside the bolt, an inner embedded shaft and a plum blossom camshaft are arranged inside the bolt and the anchor head, a ball bearing support, a ball bearing and a concave spline lock stop are arranged between the inner embedded shaft and the plum blossom camshaft, a concave spline lock stop push rod is arranged on the upper surface of the concave spline lock stop, a plum blossom cam is arranged at the bottom end of the plum blossom camshaft, a magnet is arranged at the concave part of the plum blossom cam, an inner pin bolt is arranged at the bottom end of the inner embedded shaft, a concave head spline shaft is arranged inside the expansion head connecting cylinder and the expansion head, and the concave head spline shaft is connected to the expansion head through a thread.

[0005] Further, in order to enable the plum blossom camshaft to rotate independently and the plum blossom camshaft and the inner embedded shaft to achieve coaxial and synchronous rotation, there are convex keys on the inner wall of the inner embedded shaft at the position where the concave spline lock stop is arranged, there are convex keys on the outer wall of the plum blossom camshaft at the concave spline lock stop, grooves are arranged at the corresponding positions of the concave spline lock stop, and the concave spline lock stop can move up and down under the action of the concave spline lock stop push rod.

[0006] Further, in order to ensure that the plum blossom camshaft can maintain relative plumb and free rotation, a ball bearing support is arranged on the inner wall of the inner embedded shaft, a ball bearing is arranged between the ball bearing support and the plum blossom camshaft, and the plum blossom camshaft can rotate relative to the inner embedded shaft.

[0007] Further, in order to rigidly connect the inner embedded shaft and the concave head spline shaft during the rotation and advancement of the expansion head and realize the separation function of the inner embedded shaft and the concave spline when the bolt is pulled out, when the plum blossom cam rotates a certain angle, the flange ejects the inner pin bolt and inserts it into the inner opening of the concave head spline shaft, and when it rotates back the same angle, the magnet at the concave flange of the plum blossom cam generates a magnetic force to suck the inner pin bolt back.

[0008] Further, in order to form an anchoring expansion head body, the expansion head can rotate and protrude under the action of the rotation of the concave head spline shaft.

[0009] Further, in order to enable the concave spline shaft and the inner embedded shaft to mesh and rotate relative to each other while remaining stationary, a cross groove is provided on the inner wall of the upper part of the concave spline shaft, and a cross key is provided on the outer wall of the lower part of the inner embedded shaft. The cross key of the inner embedded shaft fits with the cross groove of the concave spline shaft.

[0010] Further, in order to ensure that the soil cut by the blade and the spiral rib forms stable cement soil, the grouting pipe is uniformly and usually arranged along the anchor rod body, and grout is sprayed evenly when the enlarged head rotates forward.

[0011] The beneficial effects of the present invention are as follows: The structure of the recoverable anchor rod is compactly connected, easy to use, and reasonably designed. There are convex keys on the inner wall of the inner embedded shaft at the concave spline lock, and convex keys on the outer wall of the plum blossom camshaft at the concave spline lock. The concave spline lock is provided with grooves at corresponding positions. The concave spline lock can move up and down under the action of the push-pull rod of the concave spline lock, realizing the independent rotation of the plum blossom camshaft and the coaxial and co-frequency rotation of the plum blossom camshaft and the inner embedded shaft. A ball bearing bracket is provided on the inner wall of the inner embedded shaft, and a ball bearing is provided between the ball bearing bracket and the plum blossom camshaft. The plum blossom camshaft can rotate relative to the inner embedded shaft, ensuring that the plum blossom camshaft can remain relatively plumb and rotate freely. When the plum blossom cam rotates a certain angle, the flange ejects the inner bolt and inserts it into the inner hole of the concave spline shaft. When rotating back the same angle, the magnet at the concave edge of the plum blossom cam generates a magnetic force to suck back the inner bolt. It can realize the rigid connection between the inner embedded shaft and the concave spline shaft during the rotation and forward movement of the enlarged head, and the separation of the inner embedded shaft and the concave spline shaft when the anchor rod is pulled out. The enlarged head can rotate and protrude under the action of the rotation of the concave spline shaft to form an enlarged head. A cross groove is provided on the inner wall of the upper part of the concave spline shaft, and a cross key is provided on the outer wall of the lower part of the inner embedded shaft. The cross key of the inner embedded shaft fits with the cross groove of the concave spline shaft, enabling the concave spline shaft and the inner embedded shaft to mesh and rotate relative to each other while remaining stationary. The grouting pipe is uniformly and usually arranged along the anchor rod body, and grout is sprayed evenly when the enlarged head rotates forward, so that the soil cut by the blade and the spiral rib forms stable cement soil. When the present invention is implemented, the method is simple to operate, greatly reduces costs, increases benefits, and can effectively improve work efficiency and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure decomposition of the present invention;

[0013] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 3 It is a schematic diagram of the structure of the anchor rod body and the enlarged head of the present invention;

[0015] Figure 4 It is a schematic diagram of the structure of the concave spline lock of the present invention;

[0016] Figure 5Schematic cross-sectional structure diagram of the concave spline lock of the present invention;

[0017] Figure 6 Schematic top view structure diagram of the concave spline lock of the present invention;

[0018] Figure 7 Schematic structure diagram of the ball bearing of the present invention;

[0019] Figure 8 Schematic top view structure diagram of the ball bearing of the present invention;

[0020] Figure 9 Schematic structure diagram of the plum blossom cam of the present invention;

[0021] Figure 10 Schematic cross-sectional structure diagram of the plum blossom cam of the present invention;

[0022] Figure 11 Schematic top view structure diagram of the plum blossom cam after rotation of the present invention;

[0023] Figure 12 Schematic top view structure diagram of the plum blossom cam before rotation of the present invention;

[0024] In the figure: 1, nut; 2, bolt support; 3, anchoring leg of bolt support; 4, plum blossom camshaft; 5, embedded shaft; 6, thread; 7, anchor head; 8, bolt; 9, grouting pipe; 10, enlarged head; 11, blade; 12, drill bit; 13, spiral rib; 14, enlarged head connecting cylinder; 15, push-pull rod of concave spline lock; 16, ball bearing support; 17, ball bearing; 18, inner dowel pin; 19, magnet; 20, plum blossom cam; 21, inner opening of concave spline shaft; 22, concave spline shaft; 23, concave spline lock. Detailed implementation method

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] A recoverable bolt with end grouting anchorage, characterized in that it includes a nut 1, a bolt support 2, a bolt support anchoring leg 3, a plum blossom camshaft 4, an embedded shaft 5, a thread 6, an anchor head 7, a bolt 8, a grouting pipe 9, an expansion head 10, a blade 11, a drill bit 12, a spiral rib 13, an expansion head connecting cylinder 14, a concave spline lock stop push rod 15, a ball bearing support 16, a ball bearing 17, an inner pin 18, a magnet 19, a plum blossom cam 20, an inner opening in the concave head spline shaft 21, a concave head spline shaft 22 and a concave spline lock stop 23; an anchor head 7 is fixed at the top end of the end recoverable bolt 8, a drill bit 12 is fixed at one end of the bolt 8, spiral ribs 13 are evenly arranged on the drill bit 12, one end of the expansion head 10 is fixed to the drill bit 12 and the other end is rigidly connected to the expansion head connecting cylinder 14, blades 11 are evenly arranged on the expansion head 10, the expansion head connecting cylinder 14 is embedded in the bolt 8, one side of the bolt support 2 is provided with a bolt support anchoring leg 3, the bolt support 2 is installed on the anchor head 7, the nut 1 is installed on the anchor head 7 through the thread 6, a grouting pipe 9 is arranged inside the bolt 8, an embedded shaft 5 and a plum blossom camshaft 4 are arranged inside the bolt 8 and the anchor head 7, a ball bearing support 16, a ball bearing 17 and a concave spline lock stop 23 are arranged between the embedded shaft 5 and the plum blossom camshaft 4, a concave spline lock stop push rod 15 is arranged on the upper surface of the concave spline lock stop 23, a plum blossom cam 20 is arranged at the bottom end of the plum blossom camshaft 4, a magnet 19 is arranged at the concave part of the plum blossom cam 20, an inner pin 18 is arranged at the bottom end of the embedded shaft 5, a concave head spline shaft 22 is arranged inside the expansion head connecting cylinder 14 and the expansion head 10, and the concave head spline shaft 22 is connected to the expansion head 10 through a thread.

[0027] As a technical optimization scheme of the present invention: a convex key is arranged on the inner wall of the embedded shaft 5 at the position where the concave spline lock stop 23 is arranged, a convex key is arranged on the outer wall of the plum blossom camshaft 4 at the position of the concave spline lock stop 23, a groove is arranged at the corresponding position of the concave spline lock stop 23, and the concave spline lock stop 23 can move up and down under the action of the concave spline lock stop push rod 15; a ball bearing support 16 is arranged on the inner wall of the embedded shaft 5, a ball bearing 17 is arranged between the ball bearing support 16 and the plum blossom camshaft 4, and the plum blossom camshaft 4 can rotate relative to the embedded shaft 5; when the plum blossom cam 20 rotates a certain angle, the flange pushes out the inner pin 18 and inserts it into the inner opening of the concave head spline shaft 21, and when the rotation angle returns, the magnet 19 at the concave edge of the plum blossom cam 20 generates a magnetic force to suck back the inner pin 18; the expansion head 10 can rotate and protrude under the action of the rotation of the concave head spline shaft 22; a cross groove is opened on the inner wall of the upper part of the concave head spline shaft 22, a cross convex key is arranged on the outer wall of the lower part of the embedded shaft 5, and the cross convex key of the embedded shaft 5 fits with the cross groove of the concave head spline shaft 22; the grouting pipe 9 is evenly and usually arranged along the rod body of the bolt 8 and evenly sprays grout when the expansion head rotates forward.

[0028] When the present invention is in use, first check whether the plum blossom camshaft and the embedded shaft can rotate normally, whether the concave spline shaft, the embedded shaft and the plum blossom cam rotate coaxially and at the same frequency. Then, position the drill rig, align it with the designed drilling position, drill to the designed depth of the soil layer, fill in the anchor rod, install a nut and an anchor rod bracket at the front end of the retrievable anchor rod, gradually apply a certain prestress to tighten the nut and fix the rod body. Subsequently, tension the push rod of the concave spline lock device outwards to unlock the plum blossom camshaft and the embedded shaft, rotate the plum blossom camshaft, the plum blossom cam ejects the inner pin bolt, and the inner pin bolt is inserted into the opening in the concave spline shaft. Push the push rod of the concave spline lock device inwards to lock the plum blossom camshaft and the embedded shaft, rotate the embedded shaft, and the plum blossom camshaft and the embedded shaft rotate coaxially and at the same frequency, driving the concave spline shaft to rotate. The bottom expansion head advances while rotating, and at the same time, the blade and the spiral rib cut the soil body, and the high-pressure slurry enters the soil body through the grouting pipe to form an anchoring end until the designated position is reached, and the end grouting retrievable anchor rod is completed. When retrieving the end grouting retrievable anchor rod, tension the push rod of the concave spline lock device outwards to unlock the plum blossom camshaft and the embedded shaft, rotate the plum blossom camshaft back, the inner pin bolt returns under the action of magnetic force, and then release the connection between the embedded shaft and the concave spline shaft, connect the external extraction device, and pull out the anchor rod.

[0029] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0030] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An end-grouting anchored retrievable bolt, characterized in that: It includes a nut (1), a bolt support (2), a bolt support anchoring leg (3), a plum blossom camshaft (4), an embedded shaft (5), a thread (6), an anchor head (7), a bolt (8), a grouting pipe (9), an expansion head (10), a blade (11), a drill bit (12), a spiral rib (13), an expansion head connecting cylinder (14), a concave spline lock stop push-pull rod (15), a ball bearing support (16), a ball bearing (17), an inner pin (18), a magnet (19), a plum blossom cam (20), an inner opening in the concave head spline shaft (21), a concave head spline shaft (22) and a concave spline lock stop (23); an anchor head (7) is fixed at the top end of the end-grouting anchored retrievable bolt (8), a drill bit (12) is fixed at one end of the bolt (8), spiral ribs (13) are evenly arranged on the drill bit (12), one end of the expansion head (10) is fixed to the drill bit (12), and the other end is rigidly connected to the expansion head connecting cylinder (14), blades (11) are evenly arranged on the expansion head (10), the expansion head connecting cylinder (14) is embedded in the bolt (8), one side of the bolt support (2) is provided with a bolt support anchoring leg (3), the bolt support (2) is installed on the anchor head (7), the nut (1) is installed on the anchor head (7) through the thread (6), a grouting pipe (9) is arranged inside the bolt (8), an embedded shaft (5) and a plum blossom camshaft (4) are arranged inside the bolt (8) and the anchor head (7), a ball bearing support (16), a ball bearing (17) and a concave spline lock stop (23) are arranged between the embedded shaft (5) and the plum blossom camshaft (4), a concave spline lock stop push-pull rod (15) is arranged on the upper surface of the concave spline lock stop (23), a plum blossom cam (20) is arranged at the bottom end of the plum blossom camshaft (4), a magnet (19) is arranged in the concave part of the plum blossom cam (20), an inner pin (18) is arranged at the bottom end of the embedded shaft (5), a concave head spline shaft (22) is arranged inside the expansion head connecting cylinder (14) and the expansion head (10), and the concave head spline shaft (22) is connected to the expansion head (10) by a thread; The inner wall of the embedded shaft (5) has a convex key at the position where the concave spline lock stop (23) is arranged, the outer wall of the plum blossom camshaft (4) has a convex key at the position of the concave spline lock stop (23), the concave spline lock stop (23) is provided with a groove at the corresponding position, and the concave spline lock stop (23) can move up and down under the action of the concave spline lock stop push-pull rod (15); The inner wall of the embedded shaft (5) is provided with a ball bearing support (16), a ball bearing (17) is arranged between the ball bearing support (16) and the plum blossom camshaft (4), and the plum blossom camshaft (4) can rotate relative to the embedded shaft (5); when the plum blossom cam (20) rotates a certain angle, the flange ejects the inner pin (18) and inserts it into the inner opening of the concave head spline shaft (21), and when it rotates back, the magnet (19) at the concave edge of the plum blossom cam (20) generates a magnetic force to suck the inner pin (18) back.

2. The recoverable bolt with end grouting and anchoring according to claim 1, characterized in that: the enlarged head (10) can rotate and protrude under the action of the rotation of the concave spline shaft (22).

3. The recoverable bolt with end grouting and anchoring according to claim 1, characterized in that: a cross groove is formed on the inner wall of the upper part of the concave spline shaft (22), and a cross convex key is arranged on the outer wall of the lower part of the embedded shaft (5), and the cross convex key of the embedded shaft (5) is fitted with the cross groove of the concave spline shaft (22).

4. The recoverable bolt with end grouting and anchoring according to claim 1, characterized in that: the grouting pipe (9) is arranged uniformly along the whole length of the bolt body of the bolt (8) and sprays grout uniformly when the enlarged head rotates forward.

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