JP7451054B2 - 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. 9(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 mounting hole 5602 of the bearing plate 56 made of a steel plate such as 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. 9(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.

JP2019-167774A

Therefore, 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 and rotating the nut 58 to press the bearing plate 56 against the surface of the concrete C1 is performed by the worker. Because it is performed on scaffolding, the position is often unreasonable, making it a time-consuming task.
Furthermore, since the work involves rotating the nut 58, it takes time, and the work is dangerous because the work requires being near the bedrock onto which the concrete C1 has been sprayed for a long time.
In particular, when the tunnel cross section is large and the tunnel length is large, the number of lock bolts 54 is in the thousands or tens of thousands, and it takes a lot of time to tighten the nuts 58, and the danger increases. 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, to easily and reliably press the bearing plate against the concrete surface, and to reduce the risk. It is an object of the present invention to provide a one-touch locking bolt that 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 locking bolt, the one-touch locking bolt comprising a lock bolt main body and a locking member, and one longitudinal end of the lock bolt main body. A locking groove is provided on the outer circumferential surface of the base portion, which is open to the outside in the radial direction of the outer circumferential surface and extends through the lock bolt body in a direction orthogonal to the longitudinal direction of the lock bolt body, and the locking groove A portion of the lock bolt body on a plane that passes through and is perpendicular to the longitudinal direction of the lock bolt body is a reduced cross-sectional area that has a smaller cross-sectional area than other portions of the lock bolt body in which the locking groove is not formed. The locking member has a first leg portion and a second leg portion that extend while facing each other and are elastically deformable in directions apart from each other, and is engageable with the reduced cross-section portion and has a reduced cross-section portion. An engaging portion is provided across the first leg portion and the second leg portion to prevent movement of the locking member in a longitudinal direction of the lock bolt body and a direction perpendicular to the longitudinal direction when engaged with the reduced portion. Further, the first leg portion and the second leg portion are provided with guide portions for guiding the engaging portion to the reduced cross-section portion.
Further, in the present invention, the locking member has a connecting part that connects the first leg and the second leg, and the engaging part has a connecting part that connects the first leg and the second leg. and the connecting portion.
Further, in the present invention, a portion of the first leg portion and a portion of the second leg portion located opposite to the connecting portion with the engaging portion in between are tip portions of the legs, Tapered portions are provided in mutually opposing portions of the tip portion of the first leg portion and the tip portion of the second leg portion, and the gap therebetween gradually increases as the distance from the engaging portion increases, and the guide portion is characterized by comprising the first leg and the tapered portion of the second leg.
Further, the present invention is characterized in that the locking grooves are provided at two locations facing each other on the diameter of the lock bolt body.
Further, the present invention is characterized in that a plurality of the locking grooves are provided at intervals in the longitudinal direction of the base of the lock bolt main body.
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 rock bolt main body is inserted into the plurality of holes from the tip located opposite to the base, and the rock bolt main body is inserted against the surface of the concrete at a location on the outer peripheral surface of the rock bolt main body near the base. It is characterized by having a mark indicating how far to insert it.

According to the one-touch fixing type lock bolt of the present invention, the one-touch operation of simply engaging the lock member with the reduced cross-section portion of the lock bolt body is sufficient. Compared to the time-consuming work of rotating the bearing plate, it is possible to press the bearing plate onto the concrete surface in a shorter time, which is advantageous in improving the efficiency of rock bolt installation work.
Furthermore, since the rock bolt installation work can be carried out in a short time, it is sufficient to be in the vicinity of the rock where 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, by using the one-touch lock bolt of the present invention, 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 lock bolt can be installed easily. The time required for work can be significantly shortened, which is advantageous in shortening the construction period of tunnel construction and reducing costs.
Further, by providing the engaging portion across the first leg, the second leg, and the connecting portion, the length of the first leg and the second leg can be shortened, and the locking member can be made more compact. This is advantageous in improving the handling of the lock member and increasing the efficiency of the lock bolt installation work.
Furthermore, when the guide portion is configured with the tapered portions of the first leg portion and the second leg portion, when the engaging portion is engaged with the reduced cross-section portion, the first leg portion and the second leg portion gradually Since it opens evenly, the engaging portion can smoothly engage with the reduced cross-section portion, which is advantageous in increasing the efficiency of the lock bolt installation work.
Furthermore, if a plurality of locking grooves are provided at intervals in the longitudinal direction of the base of the rock bolt body, one rock bolt body can be commonly used for holes of different depths drilled in the ground. , which is advantageous in reducing costs.
In addition, by providing a mark on the concrete surface to indicate how far the lock bolt body should be inserted, the rock bolt body can be easily and quickly inserted into the hole drilled on the inner surface of the ground, and the lock member can be locked. This is advantageous in ensuring secure fixation to the bolt body.

(A) is a front view of the base of the rock bolt body, and (B) is a sectional view taken along line BB in (A). (A) is a side view of the locking member, and (B) is a front view thereof. (A) is a cross-sectional view of the state in which the base of the rock bolt protruding from the concrete surface is inserted into the mounting hole of the bearing plate, and the bearing plate is pressed against the concrete surface. (B) is a cross-sectional view of the state shown in (A). It is a figure of the state where the lock member was engaged with the stop groove. It is a front view of FIG. 3(B). It is an explanatory view of shoring using the one-touch locking bolt of the present invention. It is explanatory drawing of the lock bolt main body which comprises the one-touch lock bolt of a modification, (A) is a front view of the base of a lock bolt main body, (B) is a BB sectional view of (A). It is explanatory drawing of the locking member which comprises the one-touch lock bolt of a modification, (A) is a side view of a locking member, (B) is the same front view. It is a front view of the base of the lock bolt main body which comprises the one-touch lock bolt of a modification. 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.

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. 5, the one-touch lock bolt 10 includes a lock bolt main body 12 and a lock member 14, which are inserted into a hole 52 drilled into the inner surface 50 of the earth from above the concrete C1.

As shown in FIG. 5, one longitudinal end of the lock bolt body 12 inserted into the drilled hole 52 is called a tip 1202, and the other end is called a base 1204.
The lock bolt main body 12 is made of steel, and various conventionally known bar materials such as deformed reinforcing bars and round bar reinforcing bars can be used for the rock bolt main body 12.
As shown in FIG. 1, a lock is provided on the outer circumferential surface of the base 1204 of the lock bolt body 12 in a shape that is open radially outward of the outer circumferential surface and extends through the lock bolt body 12 in a direction perpendicular to the longitudinal direction of the lock bolt body 12. A groove 16 is provided, and reference numeral 1602 in FIG. 1 indicates the bottom surface of the locking groove 16.
In this embodiment, the locking grooves 16 are provided at two locations facing each other on the diameter of the lock bolt body 12, and the width W of the locking grooves 16 is uniform.

As shown by diagonal lines in FIG. 1(B), a portion of the lock bolt body 12 on a plane that passes through the lock groove 16 and is orthogonal to the longitudinal direction of the lock bolt body 12 is a lock bolt where the lock groove 16 is not formed. The reduced cross-section portion 1210 has a smaller cross-sectional area than other portions of the main body 12.
Further, as shown in FIG. 3(A), the lock bolt body 12 is placed against the surface of the concrete C1 at a location on the outer peripheral surface of the base 1204 that is away from the locking groove 16 toward the tip 1202 of the rock bolt body 12. A mark 1212 is provided to indicate how far to insert. This mark 1212 is provided, for example, by applying paint or by cutting.

As shown in FIG. 2, the lock member 14 is made of an elastic material such as steel or synthetic resin.
The locking member 14 includes a first leg 20, a second leg 22, a connecting portion 24, an engaging portion 26, and a guide portion 28.
The first leg part 20 and the second leg part 22 protrude from the connecting part 24, and the first leg part 20 and the second leg part 22 are formed in a left-right symmetrical shape, and extend while facing each other. The connecting portions 24 can be elastically deformed in directions separating from each other using the connecting portions 24 as a fulcrum.
The first leg portion 20, the second leg portion 22, and the connecting portion 24 are provided with a uniform thickness T, as shown in FIG. 2(A).
This thickness T allows the engaging portion 26 to be engaged with and disengaged from the reduced cross-section portion 1210 as described later, and also allows the lock member 14 to be attached to the lock bolt when the engaging portion 26 is engaged with the reduced cross-section portion 1210. The main body 12 is formed in such a size that it does not wobble and cannot be moved in the longitudinal direction.

The engaging portion 26 is provided across the first leg portion 20, the second leg portion 22, and the connecting portion 24.
The engaging portion 26 can be engaged with the reduced cross-section portion 1210 from the direction in which the locking groove 16 extends, and in a state in which it is engaged with the reduced cross-section portion 1210, the engaging portion 26 can be engaged with the longitudinal direction of the lock bolt body 12 and the direction orthogonal to this longitudinal direction. This prevents the locking member 14 from moving.
In the present embodiment, the engaging portion 26 includes a first linear portion 2602 provided on the first leg portion 20 and capable of contacting the bottom surface 1602 of one of the locking grooves 16, and a first linear portion 2602 provided on the second leg portion 22. A second linear part 2604 that can contact the bottom surface 1602 of the other locking groove 16; a curved part 2606 that is provided in the connecting part 24 and can contact the outer peripheral surface of the lock bolt body 12; A curved first bulging portion 2608 that is provided at the end of the first linear portion 2602 and can contact the outer circumferential surface of the lock bolt body 12; and a second linear portion that is located opposite to the curved portion 2606. A second curved bulge 2610 is provided at the end of the lock bolt body 2604 and is capable of contacting the outer peripheral surface of the lock bolt body 12.
That is, the first straight portion 2602 and the second straight portion 2604 contact the bottom surface 1602 of each locking groove 16, and the curved portion 2606, the first bulging portion 2608, and the second bulging portion 2610 are locked. By contacting the outer circumferential surface of the bolt body 12, the engaging portion 26 becomes engaged with the reduced cross-section portion 1210.

The guide portion 28 contacts the reduced cross-section portion 1210 from the extending direction of the locking groove 16, thereby opening the first leg portion 20 and the second leg portion 22 in a direction away from each other, thereby forming the engaging portion 26. to the cross-section reducing section 1210.
In this embodiment, the portion of the first leg portion 20 and the portion of the second leg portion 22 located opposite to the connecting portion 24 with the engaging portion 26 in between are the tip portions 20A of the legs 20 and 22. , 22A, and guide portions 28 are provided at the tip portions 20A, 22A of these leg portions 20, 22.
The guide portion 28 includes tapered portions 2002 at mutually opposing portions of the tip portion 20A of the first leg portion 20 and the tip portion 22A of the second leg portion 22, which gradually increase the distance between them as they move away from the engaging portion 26. , 2202 are provided, and the guide portion 28 is composed of a tapered portion 2002 of the first leg portion 20 and a tapered portion 2202 of the second leg portion 22.

Next, tunnel construction using the one-touch lock bolt 10 of this embodiment will be described.
As shown in FIG. 3, similarly to the conventional method, after the fixing material is injected into a plurality of holes 52 on the surface of the concrete C1 sprayed on the inner surface 50 of the ground of the tunnel, the rock bolt body 12 is inserted into each hole 52. do.
In this case, the rock bolt is inserted until the mark 1212 provided on the rock bolt body 12 is located on the surface of the concrete C1.
Next, the base portion 1204 of the rock bolt body 12 protruding from the surface of the concrete C1 is inserted into the mounting hole 5602 of the bearing plate 56, and the bearing plate 56 is pressed against the surface of the concrete C1.

Next, the reduced cross-section portion 1210 is inserted between the first leg portion 20 and the second leg portion 22 from the extending direction of the locking groove 16, which is a direction perpendicular to the longitudinal direction of the lock bolt body 12. The locking member 14 is grasped and moved toward the reduced cross-section section 1210.
Due to this movement of the locking member 14, the tapered part 2002 of the first leg part 20 and the tapered part 2202 of the second leg part 22 come into contact with the bottom surface 1602 of the locking groove 16, so that the first leg The portion 20 and the second leg portion 22 are elastically deformed and opened in a direction away from each other.
As the locking member 14 further moves, the curved portion 2606 comes into contact with the outer circumferential surface of the lock bolt body 12, and as shown in FIGS. 3(B) and 4, the first leg 20 and the second leg 22 The lock member 14 returns to its original position due to elasticity, and the engaging portion 26 engages with the reduced cross-section portion 1210, preventing movement of the lock member 14 in the longitudinal direction of the lock bolt body 12 and in the direction orthogonal to this longitudinal direction. The state will be as follows.
As a result, the bearing plate 56 is prevented from moving away from the surface of the concrete C1 by the locking member 14, and is held between the surface of the concrete C1 and the locking member 14, and the installation work of the lock bolt is completed.

Therefore, according to the one-touch fixing type lock bolt 10 of the present embodiment, the one-touch operation of simply engaging the lock member 14 with the reduced cross-section portion 1210 of the lock bolt body 12 is sufficient. The bearing plate 56 can be pressed against the surface of the concrete C1 in a shorter time compared to the time-consuming work of screwing the nut 58 onto the male thread of the rock bolt and rotating the nut 58, which improves the efficiency of the rock bolt installation work. It is advantageous.
Further, since the installation work of the rock bolt 10 can be carried out in a short time, 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 the 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 10 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. 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.

Furthermore, the lengths of the first leg portion 20 and the second leg portion 22 are increased, the connecting portion 24 is separated from the engaging portion 26, and the engaging portion 26 is separated from the first leg portion 20 and the second leg portion. However, if the engaging part 26 is provided across the first leg part 20, the second leg part 22, and the connecting part 24 as in this embodiment, the first leg part 20 This is advantageous in that the length of the second leg portion 22 can be shortened, the locking member 14 can be made more compact, the handling of the locking member 14 can be improved, and the lock bolt installation work can be made more efficient.
Further, the tapered portions 2002 and 2202 are omitted from the first leg portion 20 and the second leg portion 22, and the guide portion 28 is arranged between the first curved bulge portion 2608 forming the engagement portion 26 and the curved first bulge portion 2608 constituting the engagement portion 26. The second bulging portion 2610 may also be used. In this case, the lengths of the first leg portion 20 and the second leg portion 22 can be further shortened, and the locking member 14 can be made more compact. It is advantageous.
However, when the guide portion 28 is configured with the tapered portions 2002 and 2202 of the first leg portion 20 and the second leg portion 22 as in the present embodiment, the engagement portion 26 of the engaging portion 26 with the reduced cross-section portion 1210 is Since the first leg part 20 and the second leg part 22 gradually open evenly, the engagement part 26 can be smoothly engaged with the reduced cross-section part 1210, which improves the efficiency of the lock bolt installation work. This will be advantageous for promoting

Further, as shown in FIG. 6, one locking groove 16 is provided on the outer peripheral surface of the base 1204 of the lock bolt body 12, and the locking groove 16 engages with the reduced cross-section portion 1220 formed by the one locking groove 16. As shown in FIG. 7, a straight portion 2620 provided on the first leg portion 20 and in contact with the bottom surface 1602 of the locking groove 16, and a straight portion 2620 provided on the second leg portion 22 and connected to the outer periphery of the lock bolt body 12. A first curved part 2622 that contacts the surface, a second curved part 2624 that is provided on the connecting part 24 and contacts the outer peripheral surface of the lock bolt body 12, and a straight part 2620 that is located opposite to the second curved part 2624. A curved first bulging portion 2626 provided at the end of the lock bolt body 12 and in contact with the outer circumferential surface of the lock bolt body 12; The lock bolt body 12 may also include a curved second bulging portion 2628 that contacts the outer peripheral surface of the lock bolt main body 12 .
However, if the first leg portion 20 and the second leg portion 22 are formed in a symmetrical shape as in this embodiment, when the engaging portion 26 engages with the reduced cross-section portion 1210, the first leg portion 20 and the second leg portion 22 are formed in a symmetrical shape. Since the leg portion 20 and the second leg portion 22 gradually open evenly, it is advantageous to engage the engaging portion 26 with the reduced cross-section portion 1210 more smoothly, and the lock bolt installation work is simplified. This is advantageous for improving efficiency.

Further, as shown in FIG. 8, if a plurality of locking grooves 16 are provided at intervals in the longitudinal direction of the base 1204 of the rock bolt body 12, one lock bolt 54 can be inserted into the ground at a depth that is drilled into the ground. It can be used commonly for holes 52 of different sizes, which is advantageous in reducing costs.
In this way, when a plurality of locking grooves 16 are provided at intervals in the longitudinal direction of the lock bolt body 12, if the extending direction of each locking groove 16 is shifted around the central axis of the lock bolt body 12, This is advantageous in ensuring the strength and rigidity of the lock bolt body 12.
In addition, in the one-touch lock bolt 10 of this embodiment, a mark 1212 is provided on the outer peripheral surface of the lock bolt body 12 near the tip 1202 to indicate how far the rock bolt body 12 should be inserted into the surface of the concrete C1. , the lock bolt body 12 can be easily and quickly inserted into the hole 52 drilled in the inner surface 50 of the earth, and the lock member 14 can be securely fixed to the rock bolt body 12. It is advantageous.

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 locking bolt 12 Lock bolt body 1202 Tip 1204 Base 1210, 1220 Reduced cross-section portion 1412 Marker 14 Lock member 16 Locking groove 1602 Bottom surface 20 First leg 20A Tip 2002 Tapered portion 22 Second leg 22A Tip part 2202 Tapered part 24 Connection part 26 Engagement part 2602 First straight part 2604 Second straight part 2606 Curved part 2608, 2626 First bulging part 2610, 2628 Second bulging part 2620 Straight part 2622 First curved section 2624 Second curved section 28 Guide section 50 Earth's inner surface 52 Hole 54 Rock bolt 56 Bearing plate 5602 Mounting hole 58 Nuts C1, C2 Concrete

Claims (6)

It is a one-touch fixing lock bolt,
The one-touch lock bolt includes a lock bolt body and a lock member,
An outer circumferential surface of the base, which is one end in the longitudinal direction of the lock bolt body, is opened radially outward from the outer circumferential surface and extends through the outer circumferential surface in a direction orthogonal to the longitudinal direction of the lock bolt body. A locking groove having a bottom surface and a pair of side surfaces rising from both sides of the bottom surface and having a uniform width between the pair of side surfaces ,
A portion of the lock bolt body on a plane passing through the locking groove and perpendicular to the longitudinal direction of the lock bolt body has a cross-sectional area compared to other portions of the lock bolt body in which the locking groove is not formed. It has a small cross-sectional reduction part,
The locking member is a single member made of an elastic material having a uniform thickness and parallel to each other in the thickness direction, and is inserted between the pair of side surfaces in a manner that it cannot move without wobbling in the longitudinal direction of the lock bolt body. Consisting of flat plate-like members,
The locking member has a first leg portion and a second leg portion that extend while facing each other and are elastically deformable in directions perpendicular to the thickness direction and away from each other.
The first engaging portion is engageable with the reduced cross-section portion and prevents movement of the locking member in a longitudinal direction of the lock bolt body and in a direction perpendicular to the longitudinal direction when engaged with the reduced cross-section portion. provided across the leg and the second leg;
Further, a guide portion is provided on the first leg portion and the second leg portion for guiding the engaging portion to the reduced cross-section portion.
A one-touch locking bolt that is characterized by: The locking member has a connecting portion that connects the first leg and the second leg,
The engaging portion is provided across the first leg, the second leg, and the connecting portion,
The one-touch locking bolt according to claim 1, characterized in that: A portion of the first leg portion and a portion of the second leg portion located opposite to the connecting portion with the engaging portion in between are tip portions of the leg portions,
Tapered portions are provided in mutually opposing portions of the tip portion of the first leg portion and the tip portion of the second leg portion, the distance between them gradually increasing as the distance from the engaging portion increases;
The guide portion is composed of the first leg portion and the tapered portion of the second leg portion.
The one-touch fixing lock bolt according to claim 2. The locking grooves are provided at two locations facing each other on the diameter of the lock bolt body,
The one-touch lock bolt according to any one of claims 1 to 3, characterized in that: A plurality of the locking grooves are provided at intervals in the longitudinal direction of the base of the lock bolt body,
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 body is inserted from a tip located opposite to the base 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 rock bolt body should be inserted into the concrete surface is provided at a location on the outer circumferential surface of the rock bolt body near the base;
The one-touch lock bolt according to any one of claims 1 to 5, characterized in that:

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