JP7390958B2 - 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. 6(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. 6(B), a waterproof sheet is laid on the surface of the concrete C1 as necessary to prevent water from the ground from entering the tunnel, and a concrete casting mold 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.

JP2019-167774A

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-mentioned object, the present invention provides a one-touch fixing type lock bolt, wherein the one-touch fixing type lock bolt has a lock bolt body and a base portion, which is one longitudinal end of the lock bolt body, inserted through the lock bolt body. a locking member having a center hole that is rotatably attached to the lock bolt body; and a locking tool that is inserted into a locking tool insertion hole formed through the base and that is locked at a longitudinally intermediate portion thereof. The locking member has an annular plate-shaped distal end face located on the distal end side, which is the other end in the longitudinal direction of the lock bolt body, with the base inserted into the center hole, and the opposite end face thereof. an annular plate-shaped proximal end face located at the base end face, and the proximal end face has a lower end face having the smallest height from the distal end face, and a lower end face provided at a position shifted in phase from the lower end face in the circumferential direction. and a higher end surface having the height greater than the lower end surface, and the lower end surface and the higher end surface are in a state where the longitudinal intermediate portion of the locking tool is locked in the locking tool insertion hole. It is characterized in that it is provided so as to be able to come into contact with a portion of the locking tool protruding on the outer circumferential surface of the base.
Further, in the present invention, the locking tool extends linearly, and in a state where the intermediate portion in the longitudinal direction is locked in the locking tool insertion hole, both ends in the longitudinal direction are connected to the tip end surface. The lower end surface and the higher end surface protrude in a direction away from each other from the outer circumferential surface of the base at equal intervals from each other, and the lower end surface and the higher end surface each have a diameter of the center hole and a diameter of the center hole. It is characterized by being provided on both sides of the center hole.
Further, in the present invention, in the circumferential direction of the proximal end surface, between the lower end surface and the higher end surface, the height from the distal end surface increases from the lower end surface to the higher end surface in the circumferential direction of the proximal end surface. They are characterized by being connected by sloped end faces that gradually increase in length.
Further, in the present invention, a plurality of the high end surfaces are provided with a phase shift in the circumferential direction of the proximal end surface and at different heights from the distal end surface, and between the high end surfaces adjacent in the circumferential direction, An inclined end face whose height from the distal end face gradually increases in the circumferential direction of the proximal end face from the high end face where the height from the distal end face is small to the high end face where the height from the distal end face is large. It is characterized by being connected.
Further, in the present invention, the locking member has a small diameter part and a large diameter part with the central hole as the axis, the locking tool has an elongated shape, and the outer diameter of the small diameter part is the same as the locking tool. The proximal end face is an end face of the small diameter part, and the outer diameter of the large diameter part is larger than the length of the locking tool. shall be.
Further, in the present invention, the one-touch fixing type rock bolt is a rock bolt used for shoring of tunnel construction, and a hole is drilled into the inner surface of the ground from above the concrete sprayed on the inner surface of the ground, and the fixing material is injected. The lock bolt body is inserted from the tip into the plurality of holes, and the lock is inserted into the outer peripheral surface of the lock bolt body near the tip of the locking device insertion hole against the surface of the concrete. A feature is that a mark is provided to indicate how far the bolt body should be inserted.
Further, the present invention is characterized in that a plurality of the locking tool insertion holes are provided at intervals in the longitudinal direction of the lock bolt body.

According to the present invention, a one-touch operation of arranging the locking member at the base of the lock bolt body, inserting the locking tool into the locking tool insertion hole, and then rotating the locking member is sufficient, which eliminates the need for rotating the conventional nut. The lock bolt main body can be fixed in a shorter time compared to the time-consuming work, which is advantageous in improving the efficiency of the lock bolt installation work.
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.
In addition, while the locking tool has its longitudinal intermediate portion locked in the locking tool insertion hole, both longitudinal ends of the locking tool protrude away from each other from the outer peripheral surface of the base at equal intervals from the distal end surface. In this case, the lower end face and the higher end face can be installed at locations on both sides of the center hole that are diametrical to the center hole and are out of phase with each other in the circumferential direction of the proximal end surface, which will shorten the installation work of the lock bolt. It is advantageous when doing this.
Furthermore, if the lower end face and the higher end face are connected by an inclined end face, when the locking member is rotated, the locking arm smoothly rides on the higher end face via the inclined end face, and the locking member can be rotated smoothly. This is advantageous in terms of improving the efficiency of rock bolt installation work.
Further, providing a plurality of high end faces having different heights is advantageous in performing the lock bolt installation work more reliably.
In addition, if the higher end faces of different heights are connected by an inclined end face, when the locking member is rotated, the locking arm will smoothly ride on the higher end face via the inclined end face, and the rotation operation of the locking member will be controlled. This is advantageous in terms of smooth installation work, and it is advantageous in improving the efficiency of the rock bolt installation work.
In addition, if the locking member is configured to include a small diameter part and a large diameter part, and the outer diameter of the small diameter part is smaller than the length of the locking tool, it is possible to insert the locking tool into the locking tool insertion hole. This is advantageous in that it can be easily carried out.
Furthermore, if the outer diameter of the large diameter part is made larger than the length of the locking tool, it is advantageous for smooth rotation of the locking member, and it is also advantageous for increasing the efficiency of lock bolt installation work. Become.
In addition, by providing a mark on the outer circumferential surface of the long-groove lock bolt body near the tip, the lock bolt body can be easily and quickly inserted into the hole drilled on the inner surface of the earth, and the lock member can be fixed. This is advantageous in ensuring that the process is carried out reliably.
Furthermore, if a plurality of locking tool insertion holes are provided at intervals in the longitudinal direction of the rock bolt body, one rock bolt body can be commonly used for holes of different depths drilled into the ground. This is advantageous in reducing costs.

This is an explanatory view of the one-touch locking bolt of the first embodiment, and (A) is a cross-sectional view with the lower end surface of the locking member positioned above and below the base end surface, and a split pin inserted into the locking tool insertion hole. , (B) is a sectional view of a state in which the legs of the split pin are opened and the lock member is rotated so that the high end surface of the lock member and the split pin are in contact with each other. These are explanatory diagrams of the locking member, (A) is a front view of the locking member, (B) is a BB sectional view of (A), (C) is a CC sectional view of (A), and (D) is ( A) DD sectional view, (E) EE sectional view of (A), (F) FF sectional view of (A), (G) GG sectional view of (A) It is. (A) is a cross-sectional view of the locking member with the lower end surface positioned above the proximal end surface and a taper pin inserted into the locking tool insertion hole; B) is a sectional view of a state in which the lock member is rotated so that the high end face of the lock member and the large diameter end of the taper pin are in contact with each other. These are explanatory diagrams of the locking member, (A) is a front view of the locking member, (B) is a BB sectional view of (A), (C) is a CC sectional view of (A), and (D) is ( A) DD sectional view, (E) EE sectional view of (A), (F) FF sectional view of (A), (G) GG sectional view of (A) , (H) is a sectional view taken along line H--H in (A). It is an explanatory view of shoring using the one-touch fixing lock bolt of the first 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)
A first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 5.
In the following description, the same reference numerals will be given to conventional parts and members, and the description thereof will be omitted.
As shown in FIGS. 1 and 5, the one-touch fixing type rock bolt 10A includes a rock bolt body 14 inserted into a hole 52 drilled into the inner surface 50 of the earth from above the concrete C1, and a base portion of the rock bolt body 14. 1402 is inserted through the locking member 20A and attached to the lock bolt body 14; and a locking member 20A that is inserted through the locking tool insertion hole 1412 formed through the base 1402 of the lock bolt body 14 and is locked at its longitudinal intermediate portion. A tool 22 is provided.
As shown in FIG. 5, one end in the longitudinal direction of the lock bolt body 14 inserted into the drilled hole 52 is called a tip 1401, and the lock bolt body 14 is inserted into the hole 52. The other end exposed from the concrete C1 into the tunnel 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 lock bolt main body 14.
As shown in FIG. 1, the locking tool insertion hole 1412 is formed through the base 1402 of the lock bolt body 14.
Further, a mark 1430 is provided on the outer peripheral surface of the lock bolt body 14 closer to the tip 1401 than the locking tool insertion hole 1412, indicating how far the rock bolt body 14 should be inserted into the surface of the concrete C1. . This mark 1430 is provided, for example, by applying paint or by cutting.
Further, in this embodiment, a ready-made split pin 2210 is used as the locking tool 22.
The split pin 2210 has a ring-shaped head 2210A larger than the inner diameter of the fastener insertion hole 1412, and two legs 2210B that can be inserted into the fastener insertion hole 1412, and has an elongated shape. It is showing.
The split pin 2210 extends linearly, and with its longitudinal middle portion locked in the locking tool insertion hole 1412, its longitudinal ends extend from the distal end surface 2010 of the locking member 20A, which will be described later. They protrude away from the outer peripheral surface of the base 1402 at equal intervals.

As shown in FIG. 2, the locking member 20A is made of metal or synthetic resin, has an annular plate shape, and has a small diameter portion 2004 and a large diameter portion 2006 with the center hole 2002 as the axis.
The outer diameter of the small diameter portion 2004 is smaller than the length of the split pin 2210.
The large diameter portion 2006 is formed into a cylindrical shape, and the outer diameter of the large diameter portion 2006 is larger than the length of the split pin 2210.
Further, as shown in FIG. 2(A), an uneven portion 2008 is formed in the outer peripheral portion of the large diameter portion 2006 in the circumferential direction so that the locking member 20A can be easily gripped.
The center hole 2002 allows the base 1402 of the lock bolt body 14 to be inserted therethrough, and the lock member 20A is rotatably attached to the base 1402 with the base 1402 of the lock bolt body 14 inserted into the center hole 2002. It is formed with an inner diameter.

The locking member 20A has an annular plate-shaped distal end surface 2010 located on the distal end 1401 side of the lock bolt main body 14 and an annular distal end surface 2010 located on the opposite side, with the base 1402 of the lock bolt main body 14 inserted into the center hole 2002. It has a plate-shaped proximal end surface 2012.
In this embodiment, the distal end surface 2010 is formed by the end surface of the large diameter section 2006, and the proximal end surface 2012 is formed by the end surface of the small diameter section 2004.
The proximal end surface 2012 includes a lower end surface 2020 with a uniform height that is the smallest in height from the distal end surface 2010, and a lower end surface 2020 that is provided at a position that is out of phase with the lower end surface 2020 in the circumferential direction. The high end face 2022 has a uniform height with a large height.
A plurality of high end surfaces 2022 are provided with different phases and different heights in the circumferential direction of the proximal end surface 2012 in the X arrow (counterclockwise) direction shown in FIG. 2(A), and the plurality of high end surfaces 2022 are uniform. formed in height.

The plurality of high end surfaces 2022 are formed such that the height from the distal end surface 2010 increases as the distance from the lower end surface 2020 increases in the direction of the X arrow.
In the present embodiment, the high end surface 2022 adjacent to the lower end surface 2020 in the X arrow direction is formed as the first high end surface 2022A, and the high end surface 2022 adjacent to the first high end surface 2022A in the X arrow direction is formed as the first high end surface 2022A. , is formed as a second high end surface 2022B having a greater height from the tip end surface 2010 than the first high end surface 2022A.
Furthermore, in this embodiment, the split pin 2210 is in a state in which its longitudinal middle portion is locked in the locking tool insertion hole 1412, and both longitudinal ends thereof are spaced equally apart from the distal end surface 2010 of the locking member 20A. Since the lower end surface 2020, the first higher end surface 2022, and the second higher end surface 2022 protrude in a direction away from each other from the outer circumferential surface of the base 1402 at a distance of They are provided diametrically on the end face 2012 on both sides of the center hole 2002 . In other words, the lower end surface 2020, the first higher end surface 2022, and the second higher end surface 2022 are each provided two each so as to straddle the center hole 2002.

In addition, in this embodiment, the height from the distal end surface 2010 gradually increases from the lower end surface 2020 to the first high end surface 2022A in the X arrow direction. 1 inclined end face 2024.
Moreover, the height from the distal end surface 2010 gradually increases from the first high end surface 2022A to the second high end surface 2022B, which are adjacent in the X arrow direction. The two are connected by two inclined end surfaces 2026.
Note that, in the X arrow direction, the boundary between the second higher end surface 2022B and the lower end surface 2020 is connected by an upright surface 2028 that stands up from the lower end surface 2020.

Next, tunnel construction using the one-touch lock bolt 10A of this embodiment will be described.
As in the conventional case, as shown in FIG. 5, concrete C1 is sprayed onto the inner surface 50 of the ground formed by excavating the ground, and the concrete C1 is sprayed at multiple locations spaced apart in the circumferential and longitudinal directions of the tunnel. Holes 52 are drilled into the ground from above C1, and a fixing material such as mortar is injected into each hole 52.
Next, the rock bolt body 14 is inserted into each hole 52 from above the concrete C1.
In this case, as shown in FIG. 1, the rock bolt is inserted until the mark 1430 provided on the rock bolt body 14 is located on the surface of the concrete C1.
Next, the base 1402 of the lock bolt body 14 is inserted into 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.

Once the bearing plate 56 has been placed, grip the outer periphery of the large diameter portion 2006 of the locking member 20A so that the distal end surface 2010 faces the bearing plate 56 and the lower end surface 2020 is located above the higher end surface 2022. , the base 1402 of the lock bolt body 14 is inserted into the center hole 2002, and the lock member 20A is moved on the base 1402 toward the bearing plate 56.
When the distal end surface 2010 of the locking member 20A is brought into contact with the bearing plate 56, the split pin 2210 is inserted into the locking tool insertion hole 1412, and the two legs of the split pin 2210 protrude from the outer peripheral surface of the base 1402. The portion 2210B is expanded and the split pin 2210 is locked in the locking tool insertion hole 1412.
In this case, if the locking tool insertion hole 1412 extends in the vertical direction, when the split pin 2210 is inserted into the locking tool insertion hole 1412 from above, the head 2210A of the split pin 2210 will be inserted into the locking tool insertion hole. 1412, there is no risk that the split pin 2210 will come off the locking tool insertion hole and fall. Therefore, in this case, there is no need to open the two legs 2210B.
However, when the locking tool insertion hole 1412 extends in the horizontal direction, when the split pin 2210 is inserted into the locking tool insertion hole 1412, the split pin 2210 may become locked due to vibration or being hit by something. In this case, it is necessary to open the two legs 2210B because there is a risk that the device may come off the stopper insertion hole 1412 and fall.

Once the split pin 2210 is locked in the locking tool insertion hole 1412, the locking member 20A is rotated clockwise on the base 1402.
Due to the clockwise rotation of the locking member 20A, the head 2210A and two legs 2210B of the split pin 2210 reach the first higher end surface 2022A from the first inclined end surface 2024 while contacting the first inclined end surface 2024, As shown in FIG. 1(B), the first high end surface 2022A is pressed and the bearing plate 56 is pressed against the surface of the concrete C1 via the locking member 20A.
In this case, depending on the unevenness of the surface of the concrete C1, the locking member 20A is further rotated clockwise on the base 1402.
Further rotation of the locking member 20A in the clockwise direction causes the head 2210A and two legs 2210B of the split pin 2210 to move from the first higher end surface 2022A to the second higher end surface 2022B via the second inclined end surface 2026. 2. Press down the high end surface 2022B and press the bearing plate 56 against the surface of the concrete C1 via the locking member 20A.

Therefore, according to the one-touch fixing type lock bolt 10A of the present embodiment, the lock member 20A is moved on the base 1402 of the lock bolt main body 14 to come into contact with the bearing plate 56, and the split pin is inserted into the locking tool insertion hole 1412. 2210 and simply rotating the locking member 20A clockwise, this eliminates the time-consuming work of threading the nut 58 onto the external thread of the base 1402 of the conventional lock bolt 54 and rotating the nut 58. It is possible to press the bearing plate 56 against the surface of the concrete C1 in a shorter time than in the previous embodiment, which is advantageous in improving the efficiency of the rock bolt installation work.
Furthermore, since the rock bolt installation work can be carried out in a short time, it is sufficient to stay near the rock mass onto which the concrete C1 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, if the one-touch fixing type lock bolt 10A of this embodiment is used, even if the tunnel cross section is large, the tunnel length is large, and the number of lock bolts is in the thousands or tens of thousands, it is possible to lock the lock. The time required for bolt installation work can be significantly shortened, which is advantageous in shortening the construction period of tunnel construction and reducing costs.

Further, in the one-touch lock bolt 10A of the present embodiment, the lower end surface 2020 and the first higher end surface 2022A are connected by a first inclined end surface 2024 whose height from the tip end surface 2010 gradually increases. Therefore, when the locking member 20A rotates clockwise, the locking arm 16 smoothly rides on the first higher end surface 2022A via the first inclined end surface 2024, and the locking member 20A can be rotated smoothly. This is advantageous in improving the efficiency of rock bolt installation work.
Moreover, since the one-touch fixing type lock bolt 10A of the present embodiment includes the first high end face 2022A and the second high end face 2022B which are different in height, the first high end face If the bearing plate 56 cannot be pressed against the surface of the concrete C1 via the locking arm 16 by the locking arm 16 by the locking arm 16 by the second higher end surface 2022B, by further rotating the locking member 20A in the clockwise direction. The bearing plate 56 can be pressed against the surface of the concrete C1 through the screws, which is advantageous in ensuring that the rock bolt installation work is performed more reliably.

In addition, in the one-touch fixing type lock bolt 10A of the present embodiment, between the adjacent first high end surface 2022A and second high end surface 2022B, the distal end surface 2010 Since the locking arm 16 is connected to the first high end surface via the second sloped end surface 2026 when the locking member 20A rotates clockwise, 2022A to the second higher end surface 2022B, which is advantageous in smoothly rotating the locking member 20A, and is advantageous in improving the efficiency of lock bolt installation work.
In addition, in the one-touch locking bolt 10A of the present embodiment, the outer diameter of the small diameter portion 2004 of the locking member 20A is smaller than the length of the split pin 2210, so that the locking area near the small diameter portion 2004 The small diameter portion 2004 does not get in the way when inserting the cotter pin 2210 into the locking tool insertion hole 1412, which is advantageous in easily inserting the split pin 2210 into the locking tool insertion hole 1412, which facilitates the lock bolt installation work. This is advantageous in improving efficiency.
In addition, since the locking member 20A includes a large diameter portion 2006 having an outer diameter larger than the length of the split pin 2210, the large diameter portion 2006 is easy to grip, which is advantageous for smooth rotation of the locking member 20A, and locking This is advantageous in increasing the efficiency of bolt installation work.
Further, since a concavo-convex portion 2008 is provided on the outer periphery of the large-diameter portion 2006 to make it easier to grip the locking member 20A, this is advantageous in smoothly rotating the locking member 20A, and the installation of the lock bolt is advantageous. This is advantageous in improving work efficiency.
In addition, in the one-touch locking type lock bolt 10A of the present embodiment, the lock bolt body 14 is inserted against the surface of the concrete C1 at a location on the outer peripheral surface of the lock bolt body 14 near the tip 1401 of the locking tool insertion hole 1412. Since a mark 1430 is provided to indicate how far to insert, the lock bolt body 14 can be easily and quickly inserted into the hole 52 drilled in the inner surface 50 of the earth, and the lock member 20A can be securely fixed. It will be advantageous above.

(Second embodiment)
Next, a second embodiment will be described with reference to FIGS. 3 and 4.
In the following description, the same parts and members as in the first embodiment are given the same reference numerals, and the description thereof will be omitted, and different parts will be mainly explained.
The one-touch locking bolt 10B of the second embodiment differs from the first embodiment in that a taper pin 2220 is used as the locking tool 22, and since the taper pin 2220 is used, the locking member The arrangement structure of the lower end surface 2020 and the higher end surface 2022 provided on the proximal end surface 2012 of 20B is also different from the first embodiment.
Similar to the first embodiment, a surface of the concrete C1 is placed on the outer circumferential surface of the rock bolt body 14 closer to the tip 1401 than the locking tool insertion hole 1412 formed through the base 1402 of the rock bolt body 14. A mark 1430 is provided to indicate how far the lock bolt body 14 should be inserted.
Taper pin 2220 is a ready-made product and has an elongated shape.
When the taper pin 2220 is pushed into the locking tool insertion hole 1412, as shown in FIG. A large diameter end 2220A and a small diameter end 2220B of the base 1402 each protrude radially outward from the outer peripheral surface of the base 1402. In this case, unlike the first embodiment, both ends of the taper pin 2220 protrude away from the outer peripheral surface of the base 1402 at different intervals from the distal end surface 2010 of the locking member 20A.

As shown in FIG. 4, the locking member 20B includes a cylindrical portion 2030 and an annular plate portion 2032 extending radially inward from the end of the cylindrical portion 2030. is formed through it.
As shown in FIG. 4A, an uneven portion 2008 is formed in the outer peripheral portion of the cylinder portion 2030 in the circumferential direction so that the locking member 20B can be easily gripped.
Note that since the large diameter end 2220A of the taper pin 2220 is easy to hold, the outer diameter of the locking member 20B is larger than the length of the taper pin 2220, unlike the first embodiment.

With the base 1402 of the lock bolt body 14 inserted into the center hole 2002, the lock member 20B has an annular plate-shaped distal end surface 2010 located on the distal end 1401 side of the lock bolt body 14, and an annular plate-shaped distal end surface 2010 located on the opposite side. It has a plate-shaped proximal end surface 2012.
In this embodiment, the distal end surface 2010 is formed by the end surface of the cylindrical portion 2030, and the proximal end surface 2012 is formed by the end surface of the ring plate portion 2032.
The proximal end surface 2012 includes a lower end surface 2020 with a uniform height that is the smallest in height from the distal end surface 2010, and a lower end surface 2020 that is provided at a position that is out of phase with the lower end surface 2020 in the circumferential direction. The high end face 2022 has a uniform height with a large height.
A plurality of high end surfaces 2022 are provided with different phases and different heights in the circumferential direction of the proximal end surface 2012 in the X arrow (counterclockwise) direction shown in FIG. formed in height.

The plurality of high end surfaces 2022 are formed such that the height from the distal end surface 2010 increases as the distance from the lower end surface 2020 increases in the direction of the X arrow.
In the present embodiment, the high end surface 2022 adjacent to the lower end surface 2020 in the X arrow direction is formed as the first high end surface 2022A, and the high end surface 2022 adjacent to the first high end surface 2022A in the X arrow direction is formed as the first high end surface 2022A. , is formed as a second high end surface 2022B having a greater height from the tip end surface 2010 than the first high end surface 2022A.
In this embodiment, as shown in FIG. 3, when the taper pin 2220 is pushed into the locking tool insertion hole 1412, the large diameter end 2220A of the taper pin 2220 approaches the proximal end surface 2012, and the small diameter end 2220B approaches the proximal end surface 2012. 2012, different from the first embodiment, one each of the lower end surface 2020, the first higher end surface 2022, and the second higher end surface 2022 are provided so as to contact the large diameter end 2220A. .

In addition, in this embodiment, the height from the distal end surface 2010 gradually increases from the lower end surface 2020 to the first high end surface 2022A in the X arrow direction. 1 inclined end face 2024.
Moreover, the height from the distal end surface 2010 gradually increases from the first high end surface 2022A to the second high end surface 2022B, which are adjacent in the X arrow direction. The two are connected by two inclined end surfaces 2026.
Note that, in the X arrow direction, the boundary between the second higher end surface 2022B and the lower end surface 2020 is connected by an upright surface 2028 that stands up from the lower end surface 2020.

Next, tunnel construction using the one-touch lock bolt 10B of this embodiment will be described.
As in the conventional case, as shown in FIG. 5, concrete C1 is sprayed onto the inner surface 50 of the earth formed by excavating the earth, and holes 52 are drilled into the earth from above the concrete C1. A fixing material such as mortar is injected into 52.
Next, insert the rock bolt body 14 into each hole 52 from above the concrete C1 until the mark 1430 is located on the surface of the concrete C1, and then insert the base 1402 of the rock bolt body 14 into the center hole 5602 of the bearing plate 56. , and the bearing plate 56 is placed on the base 1402 of the lock bolt body 14.

Once the bearing plate 56 is placed, grip the outer circumferential portion 2004 of the locking member 20B so that the distal end surface 2010 faces the bearing plate 56 and the lower end surface 2020 is located above the high end surface 2022, and insert the center hole 2002. The base portion 1402 of the lock bolt body 14 is inserted into the lock bolt body 14 , and the lock bolt body 14 is moved onto the base portion 1402 toward the bearing plate 56 .
Once the distal end surface 2010 of the locking member 20B is in contact with the bearing plate 56, the small diameter end 2220B of the taper pin 2220 is inserted into the locking tool insertion hole 1412 and pushed in, and the taper pin 2220 is inserted into the locking tool insertion hole 1412. Lock it.

Once the taper pin 2220 is locked in the locking tool insertion hole 1412, the locking member 20B is rotated clockwise on the base 1402.
As the locking member 20B rotates clockwise, the large diameter end 2220A of the taper pin 2220 reaches the first higher end surface 2022A from the first inclined end surface 2024 while contacting the first inclined end surface 2024, and as shown in FIG. 1(B). As shown, the first high end surface 2022A is pressed and the bearing plate 56 is pressed against the surface of the concrete C1 via the locking member 20B.
Furthermore, depending on the unevenness of the surface of the concrete C1, the locking member 20B is further rotated clockwise on the base 1402.
Further rotation of the lock member 20B in the clockwise direction causes the large diameter end 2220A of the taper pin 2220 to reach from the first high end surface 2022A to the second high end surface 2022B via the second inclined end surface 2026, and presses the second high end surface 2022B. and press the bearing plate 56 against the surface of the concrete C1 via the locking member 20B.
Note that when the locking member 20B rotates, the small diameter end 2220B of the tapered pin 2220 reaches from the location opposite the first high end surface 2022A to the location opposite the second high end surface 2022; It is located at a location away from the first high end surface 2022A and the second high end surface 2022 without contacting the first high end surface 2022A and the second high end surface 2022.

Therefore, according to the one-touch fixing type lock bolt 10B of the present embodiment, the lock member 20B is moved on the base 1402 of the lock bolt body 14 to come into contact with the bearing plate 56, and the split pin is inserted into the locking tool insertion hole 1412. 2210 and simply rotating the locking member 20B clockwise, the nut 58 can be screwed onto the external thread of the base 1402 of the conventional lock bolt 54, similar to the first embodiment. , the bearing plate 56 can be pressed against the surface of the concrete C1 in a shorter time than the time-consuming work of rotating the nut 58, which is advantageous in improving the efficiency of the lock bolt installation work.
Therefore, as in the first embodiment, it is sufficient to stay near the bedrock onto which the concrete C1 has been sprayed for a short time, which is advantageous in reducing danger. This is advantageous in stabilizing the mountain quickly.
In particular, if the one-touch fixing type lock bolt 10B of this embodiment is used, even if the tunnel cross section is large, the tunnel length is large, and the number of lock bolts is in the thousands or tens of thousands, it is possible to lock the lock bolt 10B. The time required for bolt installation work can be significantly shortened, which is advantageous in shortening the construction period of tunnel construction and reducing costs.

Further, as in the first embodiment, since the first inclined end surface 2024 and the second inclined end surface 2026 are provided, this is advantageous in smoothly rotating the locking member 20B, and making it easier to install the lock bolt. This is advantageous for improving efficiency.
Further, since the first high end surface 2022A and the second high end surface 2022B are provided with different heights, it is advantageous in performing the lock bolt installation work more reliably.

Further, since the outer circumferential portion 2004 of the locking member 20B is provided with a concavo-convex portion 20082006 for making it easier to grip the locking member 20B, this is advantageous in smoothly rotating the locking member 20B, and the installation of the lock bolt is facilitated. This is advantageous in improving work efficiency.
Further, since the rock bolt body 14 is provided with a mark 1430 indicating how far the rock bolt body 14 should be inserted into the surface of the concrete C1, the rock bolt body 14 is inserted into the hole 52 drilled in the inner surface 50 of the ground. This is advantageous in that the locking member 20B can be inserted easily and quickly, and that the locking member 20B can be securely fixed.

In addition, in the first and second embodiments, the lock bolt body 14 is provided with one locking tool insertion hole 1412, but the locking tool insertion hole 1412 A plurality of rock bolts may be provided at intervals in the direction, and with such a configuration, one rock bolt body 14 can be commonly used for holes 52 of different depths drilled in the ground. , which is advantageous in reducing costs.
In this case, it is advantageous to make the locking tool insertion holes 1412 have different phases in the extending direction when viewed from the axial direction of the lock bolt body 14 in order to ensure the rigidity of the base of the lock bolt body 14.
Further, in the first and second embodiments, the case where the split pin 2210 and the taper pin 2220 are used as the locking tool 22 has been described, but the locking tool 22 is not limited to these, and various conventionally known devices can be used. Available for use.
Furthermore, in the first and second embodiments, the case where the one-touch lock bolts 10A and 10B are used for tunnel construction has been described, but the use of the one-touch lock bolts 10A and 10B is not limited to tunnel construction. , applied to various conventionally known uses.

10A, 10B One-touch lock bolt 14 Lock bolt body 1401 Tip 1402 Base 1412 Locking tool insertion hole 1430 Marker 20A, 20B Lock member 2002 Center hole 2004 Small diameter portion 2006 Large diameter portion 2010 Distal end surface 2012 Proximal end surface 2020 Lower end surface 2022 High end surface 2022A First high end surface 2022B Second high end surface 2024 First inclined end surface 2026 Second inclined end surface 2028 Upright surface 2030 Cylinder section 2032 Ring plate section 22 Locking tool 2210 Split pin 2210A Head section 2210B Leg section 2220 Taper pin 2220A Large Diameter end 2220B Small diameter end 50 Earth inner surface 52 Hole 56 Bearing plate C1 Concrete

Claims (7)

It is a one-touch fixing lock bolt,
The one-touch fixing type lock bolt includes a lock bolt body, a lock member having a center hole through which a base, which is one longitudinal end of the lock bolt body, is inserted and rotatably attached to the lock bolt body; a locking tool that is inserted into a locking tool insertion hole formed through the base and is locked at a longitudinally intermediate portion thereof,
With the base inserted into the center hole, the locking member has an annular plate-shaped distal end face located on the distal end side, which is the other end in the longitudinal direction of the lock bolt body, and a distal end face located on the opposite side thereof. and an annular plate-shaped proximal end surface,
The proximal end surface has a lower end surface having the smallest height from the distal end surface, and a higher end surface that is provided at a position shifted in phase from the lower end surface in the circumferential direction and has a larger height than the lower end surface. have,
The lower end surface and the higher end surface abut against a portion of the locking tool that protrudes onto the outer circumferential surface of the base with a longitudinally intermediate portion of the locking tool being locked in the locking tool insertion hole. It is possible to
A one-touch locking bolt that is characterized by: The locking tool extends linearly, and with its longitudinal intermediate portion locked in the locking tool insertion hole, both longitudinal ends thereof are spaced at equal intervals from the tip end surface. projecting in a direction away from each other from the outer peripheral surface of the base,
The lower end face and the higher end face are provided at locations on both sides of the center hole with a diameter of the center hole, respectively, at positions shifted in phase in the circumferential direction of the base end face.
The one-touch locking bolt according to claim 1, characterized in that: The distance between the lower end surface and the higher end surface in the circumferential direction of the proximal end surface is an inclination in which the height from the distal end surface gradually increases from the lower end surface to the higher end surface in the circumferential direction of the proximal end surface. connected at the end,
The one-touch lock bolt according to claim 1 or 2, characterized in that: A plurality of the high end surfaces are provided with a phase shift in the circumferential direction of the proximal end surface and at different heights from the distal end surface,
The distance between the high end surfaces that are adjacent to each other in the circumferential direction is from the high end surface having a small height from the distal end surface to the high end surface having a large height from the distal end surface in the circumferential direction of the proximal end surface. Connected by an inclined end surface that gradually increases in height from the tip end surface,
The one-touch lock bolt according to any one of claims 1 to 3, characterized in that: The locking member has a small diameter portion and a large diameter portion with the center hole as the axis,
The locking tool has an elongated shape,
The outer diameter of the small diameter portion is smaller than the length of the locking tool,
The proximal end surface is an end surface of the small diameter portion,
The outer diameter of the large diameter portion is larger than the length of the locking tool.
The one-touch lock bolt according to any one of claims 1 to 4, characterized in that: The one-touch fixing type rock bolt is a rock bolt used for shoring of tunnel construction,
The rock bolt main body is inserted from the tip into a plurality of holes drilled into the inner surface of the earth from above the concrete sprayed on the inner surface of the earth and into which fixing material is injected,
A mark indicating how far the lock bolt body should be inserted into the surface of the concrete is provided at a location on the outer circumferential surface of the lock bolt body near the tip of the locking tool insertion hole;
The one-touch lock bolt according to any one of claims 1 to 5, characterized in that: A plurality of the locking tool insertion holes are provided at intervals in the longitudinal direction of the lock bolt body.
The one-touch fixing lock bolt according to any one of claims 1 to 6.

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