JP7365945B2 - One-touch lock bolt - Google Patents

Description

TECHNICAL FIELD The present invention relates to a one-touch locking bolt suitable for use in shoring for tunnel construction, etc.

For example, in a mountain tunnel excavated by the NATM construction method, as shown in FIG. 10(A), concrete C1 is sprayed onto the inner surface 50 of the ground formed by excavating the ground.
Thereafter, holes 52 are drilled into the inner surface 50 of the rock from above the hardened concrete C1 at multiple locations spaced apart in the circumferential and longitudinal directions of the tunnel, and a fixing material such as mortar is injected into each hole 52. Ru.
Then, a lock bolt 54 is inserted into each hole 52, and the base of the lock bolt 54 protruding from the concrete C1 is inserted into the center hole 5602 of a steel bearing plate 56 made of a square plate or a round plate. The bearing plate 56 is pressed against the surface of the concrete C1, the nut 58 is screwed onto the male thread at the base of the rock bolt 54, and the nut 58 is tightened to press the bearing plate 56 against the surface of the concrete C1. The installation work has been completed and the rock is being fixed.
After that, as shown in Fig. 10(B), a waterproof sheet is laid on the surface of the concrete C1 to prevent water from the ground from entering the tunnel, and the concrete is placed opposite to this waterproof sheet. A frame is placed, and concrete C2 is poured between the waterproof sheet and the formwork surface of the concrete pouring formwork to perform lining concrete.

Japanese Patent Application Publication No. 2019-167774

On the other hand, in rock bolt work, which is part of the shoring work for tunnel construction, the work of screwing the nut 58 onto the male thread at the base of the rock bolt 54, rotating the nut 58, and pressing the bearing plate 56 against the surface of the concrete C1 is performed by the worker. This is a time-consuming process, as it is often done in an awkward position as the person is placed on a scaffold.
Furthermore, since the work involves rotating the nut 58, it is time consuming and requires being near the bedrock onto which the concrete C1 has been sprayed for a long time, making the work accompanied by danger.
In particular, when the tunnel cross section is large and the tunnel length is large, the number of lock bolts 54 becomes thousands or tens of thousands, and the work of tightening the nuts 58 takes a lot of time and increases the danger. Some kind of improvement was desired from the perspective of shortening the construction period of tunnel construction and reducing costs.
The present invention was developed in view of the above circumstances, and its purpose is to omit the work of tightening nuts and to press the bearing plate onto the concrete surface with one touch, which is advantageous in reducing danger. An object of the present invention is to provide a one-touch fixing lock bolt which is advantageous in shortening the construction period of tunnel construction and reducing costs, and is suitable for use as a support for tunnel construction.

In order to achieve the above object, the present invention provides a one-touch lock bolt, the one-touch lock bolt having a lock bolt body and a base portion that is one longitudinal end of the lock bolt body. a hollow locking member having a center hole to be inserted therethrough, and a male tooth extending in the circumferential direction of the base while protruding outward in the radial direction of the base on the outer circumference of the base of the lock bolt. A plurality of portions are arranged in the longitudinal direction of the base, and a locking portion is provided on the inner circumference of the center hole, and the locking portion is elastically deformable so as to overcome the plurality of male teeth. The locking member is configured to allow movement of the locking member in a direction toward a tip that is the other end of the lock bolt body located opposite to the base along the longitudinal direction of the base, and to engage the male toothed portion. It is characterized in that it is configured to prevent the locking member from moving in a direction away from the tip.
Further, the present invention is characterized in that a plurality of the locking portions are provided in a state separated from each other at intervals in the circumferential direction of the inner circumferential surface of the center hole.
Further, in the present invention, each of the locking portions projects from the inner circumferential surface of the center hole, and has an inclination that is displaced in a direction away from the tip portion as it moves away from the inner circumferential surface inward in the radial direction. It is characterized by
Further, the present invention is characterized in that the tip of each of the locking portions has an arcuate shape that can be engaged with the male tooth portion.
Further, the present invention is characterized in that a plurality of the locking portions are provided at intervals in the axial direction of the center hole.
Further, the present invention provides that the inner peripheral portion of the center hole is provided with a guide surface that slidably contacts the male tooth portion and aligns the axis of the center hole with the center axis of the base. It is characterized by
Further, the present invention is characterized in that the guide surface is provided at a plurality of locations that are out of phase with the locking portion in the circumferential direction of the center hole and extend in the axial direction of the center hole. do.
Further, the present invention is characterized in that the guide surface is provided extending in the circumferential direction of the center hole at a location that is out of phase with the locking portion in the axial direction of the center hole. .
Further, in the present invention, the rock bolt main body is a reinforcing bar of different diameters, the base part is formed with a circular cross section of a uniform outer diameter by cutting off the ribs of the reinforcing bar of different diameters, and the male tooth part is formed of the circular cross section. It is characterized by being provided at certain locations.

According to the one-touch fixing lock bolt of the present invention, it is possible to omit the time-consuming work of rotating a conventional nut during rock bolt work for shoring work in tunnel construction, and simply insert the lock member along the base of the lock bolt body. This is advantageous in increasing the efficiency of lock bolt installation work, as it only requires a one-touch operation of moving it toward the tip.
In addition, since rock bolt installation work can be done in a short time, during shoring work for tunnel construction, it is only necessary to be near the bedrock onto which concrete has been sprayed for a short time, which is advantageous in reducing danger.
In addition, since the ground can be supported in a short time, it is advantageous in stabilizing the ground quickly.
In particular, even when the tunnel cross section is large, the tunnel length is large, and the number of rock bolts is in the thousands or tens of thousands, the time required for rock bolt installation work can be significantly shortened, and tunnel construction This is advantageous in shortening the construction period and reducing costs.
Furthermore, providing a plurality of separate locking portions is advantageous in reliably preventing the lock member from moving away from the tip of the lock bolt body, and the locking portions are likely to be elastically deformed. This is advantageous in that the locking member can be moved more smoothly in the direction toward the tip.
In addition, providing a slope to the locking part is advantageous for smoother movement of the locking member in the direction toward the tip of the lockbolt body, and at the same time, it is advantageous for smoother movement of the locking member in the direction toward the tip of the lockbolt body. This is advantageous in that the locking member can be easily prevented from moving.
In addition, if the tip of the locking part is formed into an arc shape that can be engaged with the male tooth, it is advantageous to securely lock the locking part with the male tooth. This is advantageous in making it impossible for the locking member to move in the direction of separation.
Furthermore, if a guide surface is provided on the inner circumference of the center hole of the locking member to allow sliding contact with the male tooth portion and align the axis of the center hole with the center axis of the base of the lock bolt body, the male tooth portion Even if the lock member rattles on the male tooth part due to the shape and dimensions of the locking part, this prevents the lock member from rattling on the male tooth part and allows the lock member to move more smoothly. It will be advantageous in doing so.
Such a guide surface may be at a location on the inner circumference of the center hole that is out of phase with the locking portion in the circumferential direction of the center hole, or at a location at the center that is out of phase with the locking portion in the axial direction of the center hole. It may be located on the inner periphery of the hole, and in either case, it is advantageous to prevent the locking member from rattling on the male tooth portion and to move the locking member more smoothly.
Further, when a deformed reinforcing bar is used for the lock bolt body, the base can be easily formed by scraping off the ribs, which is advantageous in easily forming the male tooth portion.

It is explanatory drawing of a lock bolt main body, (A) is a top view of a lock bolt main body, and (B) is an enlarged sectional view of a base. FIG. 2 is an explanatory diagram of the locking member, in which (A) is a front view of the locking member, and (B) is a cross-sectional side view. (A) is an explanatory diagram in which the locking part passes over the male tooth part and the locking member moves toward the bearing plate, and (B) is an explanatory diagram of the locking member being pressed against the bearing plate and the locking part passing over the male tooth part. FIG. 6 is an explanatory diagram of a state in which the locking member is locked and movement of the locking member is prevented. FIG. 7 is a cross-sectional side view of a locking member according to a second embodiment. (A) is a front view of a locking member of a third embodiment, and (B) is a cross-sectional side view of the same. These are explanatory diagrams of a locking member according to a third embodiment, in which (A) is a cross-sectional side view of the locking member in which the locking portion rides over the male toothed portion, and (B) is a guide surface in contact with the male toothed portion. FIG. (A) is a front view of a locking member of a fourth embodiment, and (B) is a cross-sectional side view of the same. FIG. 7 is an explanatory diagram of the fourth embodiment, and is a cross-sectional side view of the locking member in which the locking portion rides over the male tooth portion and the guide surface is in contact with the male tooth portion. It is an explanatory view of shoring using the rock bolt of this embodiment. In the explanatory diagrams of the conventional construction method, (A) is an explanatory diagram of shoring, and (B) is an explanatory diagram of lining concrete.

(First embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
Note that the same reference numerals are given to the conventional parts and members, and the explanation thereof will be omitted.
As shown in FIG. 9, the one-touch fixing type rock bolt 10 includes a rock bolt body 14 inserted into a hole 12 drilled into the inner surface 50 of the ground from above the concrete C1, and a lock protruding into the tunnel from the concrete C1. The locking member 16 is coupled to the base 1402 of the bolt body 14.
Note that one end of the lock bolt body 14 in the longitudinal direction is called a tip 1401, and the other end is called a base 1402.
The lock bolt main body 14 is made of steel, and a deformed reinforcing bar or a round bar reinforcing bar is used for the rock bolt main body 14, and in this embodiment, a different diameter reinforcing bar is used.

As shown in FIG. 1, the base 1402 of the lock bolt main body 14 is formed with a circular cross section of a uniform outer diameter in which the ribs of the reinforcing bars of different diameters are shaved off, and the male tooth portion 18 is provided on the base 1402.
The male tooth portions 18 are provided so as to protrude outward in the radial direction of the base portion 1402 in a V-shape and extend around the entire circumferential direction of the base portion 1402. There are multiple locations.

As shown in FIG. 2, the locking member 16 is made of metal or synthetic resin. In this embodiment, it is made of synthetic resin and has a hollow shape.
The lock member 16 has a center hole 1601 into which the base 1402 of the lock bolt body 14 is inserted.
The lock member 16 is allowed to move in the direction toward the tip 1401 of the lock bolt body 14 along the longitudinal direction of the base 1402 on the plurality of male teeth 18 on the inner circumference of the center hole 1601 of the lock member 16. In addition, an elastically deformable locking portion 20 is provided that prevents the lock bolt main body 14 from moving in a direction away from the tip portion 1401.

To explain in detail, the inner circumferential surface 1602 of the locking member 16 is formed with an inner diameter slightly larger than the outer diameter of the male tooth portion 18, and the locking portion 20 is provided to protrude from this inner circumferential surface 1602. .
The locking portions 20 are provided at a plurality of locations on the inner circumferential surface 1602 at intervals in the circumferential direction and are separated from each other.
In this embodiment, four locking portions 20 are provided at intervals of 90 degrees in the circumferential direction of the inner circumferential surface 1602, each of which is formed of a cylindrical elastically deformable piece, and the tip of the locking portion 20 is , has an arcuate shape that can be engaged with the male tooth portion 18 so as to be securely engaged with the male tooth portion 18.
With the base 1402 inserted into the center hole 1601 of the locking member 16, each locking portion 20 moves away from the tip 1401 of the lock bolt body 14 as it moves away from the inner peripheral surface 1602 in the radial direction. It has an inclination that is displaced by
Therefore, when the base 1402 is inserted into the center hole 1601 of the locking member 16 and the locking member 16 is moved toward the tip 1401 of the lock bolt body 14, as shown in FIG. 20 elastically deforms in the direction approaching the inner circumferential surface 1602 and overcomes the plurality of male teeth 18, allowing the lock member 16 to move in the direction of the tip 1401 of the lock bolt body 14.
Furthermore, when the locking member 16 is moved in a direction away from the tip 1401 of the lock bolt body 14, the plurality of locking portions 20 lock onto the male tooth portion 18, as shown in FIG. 3(B). , disables movement of the lock member 16 in the direction away from the tip 1401 of the lock bolt body 14.

Next, tunnel construction using the one-touch lock bolt 10 of this embodiment will be described.
As shown in FIG. 9, concrete C1 is sprayed onto the inner surface 50 of the earth formed by excavating the earth.
Next, holes 12 are drilled into the ground from above the concrete C1 at multiple locations spaced apart in the circumferential and longitudinal directions of the tunnel, and a fixing material such as mortar is injected into each hole 12.
Next, the rock bolt bodies 14 are inserted into each hole 12 from above the concrete C1.
Once the lock bolt body 14 has been inserted, the base 1402 of the lock bolt body 14 is inserted through the center hole 5602 of the bearing plate 56, and the bearing plate 56 is placed in the base 1402 of the rock bolt body 14.

Next, as shown in FIG. 3A, the base 1402 of the lock bolt body 14 is moved to the center of the lock member 16 so that the tip of each locking portion 20 faces away from the tip 1401 of the lock bolt body 14. The lock member 16 is inserted into the hole 1601 and moved on the base 1402 toward the tip 1401 of the lock bolt body 14.
In this case, the plurality of locking portions 20 are elastically deformed in the direction approaching the inner circumferential surface 1602 and overcome the plurality of male tooth portions 18, and the lock member 16 is prevented from moving toward the tip portion 1401 of the lock bolt body 14. It is carried out without any problems.
When the locking member 16 reaches the bearing plate 56, the flat annular end face of the locking member 16 presses the bearing plate 56 against the surface of the concrete C1, and the worker releases the locking member 16.
In this state, even if the locking member 16 attempts to move away from the tip 1401 of the lock bolt body 14, the plurality of locking portions 20 will lock onto the male tooth portion 18, as shown in FIG. 3(B). Therefore, the locking member 16 is prevented from moving in the direction away from the tip 1401 of the lock bolt body 14, and the state in which the bearing plate 56 is pressed against the surface of the concrete C1 is maintained.
The work of inserting the base 1402 of the lock bolt body 14 into the lock member 16 and moving the lock member 16 on the base 1402 toward the concrete C1 is performed for each rock bolt body 14, and the one-touch fixed lock is The installation work of the bolts 10 is completed.

Therefore, according to the one-touch fixing type lock bolt 10 of the present embodiment, the one-touch operation can be performed by simply moving the lock member 16 on the base 1402 toward the tip 1401 of the lock bolt body 14 and releasing the hand from the lock member 16. Therefore, it is possible to press the bearing plate 56 against the surface of the concrete C1 in a shorter time than the conventional work of screwing the nut 58 onto the male thread at the base of the lock bolt 54 and rotating the nut 58. This is advantageous in increasing the efficiency of rock bolt installation work.
Furthermore, according to the one-touch fixing type rock bolt 10 of the present embodiment, the rock bolt can be installed in a short time, so it is sufficient to stay near the bedrock onto which the concrete C1 has been sprayed for a short time, thereby reducing the danger. It is advantageous in reducing
In addition, since the ground can be supported in a short time, it is advantageous in stabilizing the ground quickly.
In particular, even when the tunnel cross section is large, the tunnel length is large, and the number of rock bolts is in the thousands or tens of thousands, the time required for rock bolt installation work can be significantly shortened, and tunnel construction This is advantageous in shortening the construction period and reducing costs.

Further, in this embodiment, since a plurality of locking portions 20 are provided in a separated state, this is advantageous in reliably preventing movement of the locking member 16 in the direction away from the surface of the concrete C1, and The locking portion 20 becomes easier to elastically deform, which is advantageous in smoothly moving the locking member 16 in the direction toward the surface of the concrete C1.
Further, since the locking portion 20 is formed with an inclination, it is advantageous for the locking member 16 to move more smoothly in the direction toward the tip 1401 of the lock bolt body 14, and at the same time, the tip This is advantageous in that the locking member 16 can be easily prevented from moving in the direction away from 1401.
In addition, since the tip of the locking part 20 has an arcuate shape that can be engaged with the male tooth part 18, it is advantageous for reliably locking the lock part 20 with the male tooth part 18, and the lock This is advantageous in making it impossible for the locking member 16 to move in the direction away from the tip 1401 of the bolt body 14.
Further, when a deformed reinforcing bar is used for the lock bolt body 14, the base portion 1402 can be easily formed by scraping off the ribs, which is advantageous in easily forming the male tooth portion 18.

(Second embodiment)
Next, a second embodiment will be described with reference to FIG. 4.
In the following description of the embodiment, the same parts and members as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted, and different parts will be mainly explained.
In the first embodiment, depending on the shapes and dimensions of the male tooth portion 18 and the locking portion 20, the locking member 16 may wobble on the male tooth portion 18.
Therefore, a plurality of locking portions 20 are provided at intervals in the axial direction of the center hole 1601.
In the second embodiment, four locking portions 20 are provided at two locations spaced apart from each other in the axial direction of the center hole 1601, each with an interval of 90 degrees.

According to the second embodiment, rattling of the lock member 16 on the male tooth portion 18 can be prevented regardless of the shape and dimensions of the male tooth portion 18 and the locking portion 20. This is advantageous in that the locking member 16 can be moved more smoothly in the direction toward the surface of the concrete C1.
In addition, in this embodiment, the phase of the four locking parts 20 at two places where the four locking parts 20 are provided is the same when viewed from the axial direction of the center hole 1601. As described above, it is possible to make the circumferential phase of the center hole 1601 different between the four locking portions 20 at one location and the four locking portions at the other location. It is also possible to arrange them in a staggered manner on the inner peripheral surface 1602 of the hole 1601.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. 5 and 6.
In the second embodiment, a plurality of locking portions 20 are provided at different locations in the axial direction of the center hole 1601 in order to prevent the locking member 16 from wobbling on the male tooth portion 18. In the third embodiment, the axis of the center hole 1601 is placed in the base 1402 of the lock bolt body 14 so as to be slidably in contact with the male toothed portion 18 on the inner circumference of the center hole 1601 without increasing the number of locking portions 20. A guide surface 30A is provided to match the central axis of the guide surface 30A.
To explain in detail, the center hole 1601 protrudes inward in the radial direction of the inner circumferential surface 1602 at multiple locations on the inner circumferential surface 1602 that is out of phase with the plurality of locking portions 20 in the circumferential direction of the center hole 1601 of the locking member 16. A protrusion 32 extending in the axial direction is provided.
The protrusions 32 extend over the entire length of the center hole 1601, and the guide surface 30A is formed at the top of each protrusion 32 with a cylindrical surface that slidably contacts the male tooth portion 18. It extends over the entire length of the center hole 1601.

Therefore, since the guide surface 30A is provided at a position shifted in phase from the locking portion 20 in the circumferential direction of the center hole 1601 of the locking member 16, the guide surface 30A does not interfere with the movement of the locking portion 20. do not have.
That is, when the lock member 16 is moved toward the tip 1401 of the lock bolt body 14, as shown in FIG. to allow the lock member 16 to move in the direction of the tip 1401 of the lock bolt body 14, and to move the lock member 16 in the direction away from the tip 1401 of the lock bolt body 14. Then, as shown in FIG. 3(B), the plurality of locking portions 20 lock onto the male tooth portion 18, making it impossible for the locking member 16 to move away from the tip 1401 of the lock bolt body 14. shall be.
Further, as shown in FIG. 6(B), when the base 1402 of the lock bolt body 14 is inserted into the center hole 1601 of the lock member 16, each guide surface 30A comes into sliding contact with the male toothed portion 18, and the center The axis of the hole 1601 is aligned with the central axis of the base 1402.
Therefore, in the third embodiment as well, as in the second embodiment, regardless of the shapes and dimensions of the male tooth part 18 and the locking part 20, This is advantageous in that the locking member 16 can be prevented from wobbling at the surface of the concrete C1, and the locking member 16 can be moved more smoothly in the direction toward the surface of the concrete C1.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. 7 and 8.
While the third embodiment provided the guide surface 30A at a position shifted from the plurality of locking portions 20 in the circumferential direction of the center hole 1601 of the locking member 16, the fourth embodiment The difference is that, as shown in FIG. 7, the guide surface 30B is provided at a location out of phase with the locking portion 20 in the axial direction of the center hole 1601.
To explain in detail, a small diameter portion 34 having an inner diameter smaller than that of the inner circumferential surface 1602 is located at a location on the inner circumferential surface 1602 that is out of phase with the plurality of locking portions 20 in the axial direction of the center hole 1601 of the locking member 16. The guide surface 30</b>B is provided extending in the axial direction of the hole 1601 , and the guide surface 30</b>B is formed by the inner circumferential surface of the small diameter portion 34 .
The guide surface 30B is formed of a cylindrical surface that extends all the way around the center hole 1601 in the circumferential direction and extends for a predetermined length in the axial direction of the center hole 1601.
The guide surface 30B is formed to slidably contact the male tooth portion 18 and align the axis of the center hole 1601 with the center axis of the base portion 1402.

Therefore, since the guide surface 30B is provided at a location that is out of phase with the locking portion 20 in the axial direction of the center hole 1601 of the locking member 16, the guide surface 30B does not interfere with the movement of the locking portion 20. There is no.
That is, when the locking member 16 is moved toward the tip 1401 of the lock bolt body 14, the plurality of locking portions 20 are elastically deformed in the direction approaching the inner circumferential surface 1602, and the plurality of male molds If the lock member 16 is allowed to move in the direction of the tip 1401 of the lock bolt body 14 by getting over the teeth 18, and if the lock member 16 is attempted to be moved in the direction away from the tip 1401 of the lock bolt body 14, As shown in FIG. 3(B), the plurality of locking portions 20 lock onto the male tooth portion 18, making it impossible for the lock member 16 to move away from the tip portion 1401 of the lock bolt body 14.
Further, as shown in FIG. 8, when the base 1402 of the lock bolt body 14 is inserted into the center hole 1601 of the lock member 16, the guide surface 30B comes into sliding contact with the male toothed portion 18, and the axis of the center hole 1601 Align the center with the central axis of the base 1402.
Therefore, in the fourth embodiment as well, as in the third embodiment, regardless of the shapes and dimensions of the male tooth part 18 and the locking part 20, This is advantageous in that the locking member 16 can be prevented from wobbling at the surface of the concrete C1, and the locking member 16 can be moved more smoothly in the direction toward the surface of the concrete C1.

In addition, in this embodiment, the case where the one-touch locking type lock bolt 10 is used for tunnel construction has been described, but the use of the one-touch locking type lock bolt 10 is not limited to tunnel construction, but can be applied to various conventionally known uses. be done.

10 One-touch fixing type lock bolt 12, 52 Hole 14 Lock bolt body 1401 Tip part 1402 of lock bolt body Base part 16 of lock bolt body Lock member 1601 Center hole 1602 Inner peripheral surface 18 Male tooth part 20 Locking part 30A, 30B Guide Surface 32 Convex strip 34 Small diameter portion C1, C2 Concrete 50 Earth inner surface 52 Hole 54 Rock bolt 56 Bearing plate 5602 Center hole 58 Nut

Claims (9)

It is a one-touch fixing lock bolt,
The one-touch fixing type lock bolt includes a lock bolt main body and a hollow lock member having a center hole through which a base, which is one end in the longitudinal direction of the lock bolt main body, is inserted,
A plurality of male teeth protruding outward in the radial direction of the base and extending in the circumferential direction of the base are arranged on the outer circumference of the base of the lock bolt main body and arranged in the longitudinal direction of the base,
A locking portion is provided on the inner circumference of the center hole,
The locking portion is elastically deformable, and extends over the plurality of male teeth in a direction toward the tip, which is the other end of the lock bolt body, located opposite to the base along the longitudinal direction of the base. The locking member is configured to allow movement of the locking member in the direction, and is configured to be locked to the male tooth portion and disable movement of the locking member in a direction away from the tip portion.
A one-touch locking bolt that is characterized by: A plurality of the locking portions are provided in a state in which they are separated from each other at intervals in the circumferential direction of the inner peripheral surface of the center hole.
The one-touch locking bolt according to claim 1, characterized in that: Each of the locking portions protrudes from the inner circumferential surface of the center hole, and has an inclination that moves away from the tip portion as it moves away from the inner circumferential surface in the radial direction.
The one-touch fixing lock bolt according to claim 2. The tip of each of the locking parts has an arc shape that can be engaged with the male tooth part,
The one-touch fixing lock bolt according to claim 3. A plurality of the locking portions are provided at intervals in the axial direction of the center hole,
The one-touch lock bolt according to any one of claims 1 to 4, characterized in that: The inner circumference of the center hole is provided with a guide surface that slidably contacts the male tooth portion and aligns the axis of the center hole with the center axis of the base.
The one-touch lock bolt according to any one of claims 1 to 5, characterized in that: The guide surface is provided extending in the axial direction of the center hole at a plurality of locations that are out of phase with the locking portion in the circumferential direction of the center hole.
The one-touch locking bolt according to claim 6, which refers to any one of claims 2, 3, and 4. The guide surface is provided so as to extend in the circumferential direction of the center hole at a location that is out of phase with the locking portion in the axial direction of the center hole.
The one-touch lock bolt according to claim 6, which refers to any one of claims 2 to 5. The rock bolt main body is a reinforcing bar of different diameters, the base is formed with a circular cross section of a uniform outer diameter by cutting off the ribs of the reinforcing bar of different diameters, and the male tooth portion is provided at a location of this circular cross section. ,
The one-touch lock bolt according to any one of claims 1 to 5, characterized in that:

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