JP2852505B2 - Anchor bolt device for retaining wall fixing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall fixing anchor bolt device for fixing a concrete retaining wall cast on a rock on a road slope to the rock.

[0002]

2. Description of the Related Art Conventionally, when a road or a forest road is newly constructed in a mountainous remote place, the surface soil on the slope is excavated and removed to prevent the soft ground on the slope from collapsing. Is exposed and concrete is cast into a well shape or the like on the surface of this rock to protect the slope. At the molded concrete retaining wall, an anchor bolt is driven into the rock through the concrete retaining wall from the surface at a required interval, and the head of the anchor bolt is projected from the concrete retaining wall. As shown in FIG. 7, a base plate, a spherical washer and a receiving plate are set on the retaining wall at the position of the portion, and a fastening nut is screwed into a head portion of an anchor bolt protruding upward from the receiving plate to receive the receiving plate. To prevent the concrete retaining wall from peeling off and sliding off the rock.

[0003] In addition, during the long-term use, the fastening nut is loosened with respect to the anchor bolt due to the displacement of the concrete retaining wall with respect to the bedrock, and it is necessary to adjust the fastening again. In order to maintain watertightness with the tightening nut and prevent rusting due to oil leakage, a protective cap is mounted on the upper surface side of the receiving plate, and the bolt holes provided on the support plate inside the cap are anchor bolt heads. The protective cap is fastened to the end so that the open end of the protective cap is in close contact with the receiving plate.

[0004]

However, in the above-mentioned anchor bolt device, since the head portion is directly fixed to the upper surface of the receiving plate with the fastening nut, the anchor bolt in the concrete retaining wall due to the crustal deformation, etc. Impact vibration is applied in the longitudinal direction along the anchor bolt and in the direction intersecting the anchor bolt, and the tensile stress and shear stress cause the anchor bolt to break, and the retaining wall around the anchor bolt cracks, causing the concrete retaining wall to crack. Peeled from the bedrock,
There is a risk of slipping. Also, in the protective cap,
During long-term use, the bolt holes in the support plate are loosened and the water tightness inside the protective cap is reduced, the oil filled inside leaks, and the anchor bolts and tightening nuts rust. There were problems such as inability to do so.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to absorb and reduce the impact vibration applied to an anchor bolt in a concrete retaining wall to break the anchor bolt and to break the concrete retaining wall. Anchor bolt device for retaining wall fixing that can prevent cracks, etc., has high water tightness in the protective cap, has a simple structure of the device itself, can use existing parts at low cost, and can save construction costs for constructing concrete retaining walls. Is to provide.

[0006]

Means for Solving the Problems In order to achieve the above object, an anchor bolt device for fixing a retaining wall according to the present invention comprises:
An anchor bolt 18 that is driven into the rock 12 through a concrete retaining wall 14 installed in the rock 12 and has a head portion 16 protruding to the outer surface side of the retaining wall, and an anchor bolt 18 on the outer surface 20 of the concrete retaining wall. 18 head section 16
And an elastic shock absorbing portion 22 for elastically absorbing a shock applied to the anchor bolt 18, and an upper surface of the elastic shock absorbing portion 22 locked to a head end side of the anchor bolt 18. The fixing nut 24 is provided with a spherical portion 56 on the lower surface side thereof. A metal spacer 33 is provided between the fixing nut 24 and the elastic shock absorbing portion 22. The metal spacer 33 has the fixing nut 24 on its upper surface.
The anchor bolt device 10 for fixing a retaining wall is provided with a spherical receiving portion 60 which engages and supports the spherical portion 56 of this type so as to be free to tilt.

The elastic shock absorbing portion 22 has a bottomed cylindrical support 32 disposed closest to the concrete retaining wall 14, and an inner side of the support 32 provided with the anchor bolt 18. The elastic body 3 supported while being penetrated by the head portion 16 and having the metal spacer 33 mounted on the upper surface thereof
4 may be provided.

The elastic body 34 may be made of a rubber member.

The elastic body 34 may be formed of a spring member.

The support 32 has a protective cap 36 for covering and protecting the head 16 of the internal anchor bolt 18, the fixing nut 24, the elastic body 34 and the like.
May be screwed and fixed.

A bag 62 in which a lubricant is sealed is inserted into the protective cap 36. The bag 62 is ruptured with a needle or the like in the protective cap 36 and the lubricant is filled therein. A small hole 64 may be formed.

[0012]

The anchor bolt device for retaining wall fixing according to the present invention is applied to a bedrock after excavating a surface soil on a slope on a side of a road.
In order to prevent the rock from collapsing, a concrete retaining wall is cast with cast-in-place concrete on the surface, and in order to firmly fix this concrete retaining wall to the rock, a number of anchor bolts are inserted into the rock from the top side of the concrete retaining wall. And type
It is installed on the head projecting to the outer surface of the concrete retaining wall. At the position of the head part of the anchor bolt,
An elastic shock absorber is installed on the concrete retaining wall, and a fixing nut is screwed and fixed to the head on the upper surface side.Tension stress and shear stress due to impact vibration are applied to the anchor bolts inside the concrete retaining wall due to crustal deformation. Even if steel is added, the elastic shock absorbing part can absorb the strain due to each stress and prevent the anchor bolt from breaking, prevent the concrete retaining wall from falling off the rock and prevent the danger of slipping, and increase the service life. Becomes In addition, the anchor bolt device for retaining wall fixing can use restricted parts for fixing nuts, elastic shock absorbing parts, etc. without using large spherical washers, etc.
The structure is simple, the manufacturing cost is low, and the construction cost of the concrete retaining wall is low.

The fixing nut has a spherical portion on the lower surface side thereof, and a metal spacer is interposed between the fixing nut and the elastic shock absorbing portion. On the side, there is provided a spherical receiving portion for engaging and supporting the spherical portion of the fixing nut so as to be free to tilt. The fixing nut is pressed into contact with the upper surface of the elastic shock absorbing part via the metal spacer so that the lower surface of the elastic shock absorbing part can be in close contact with the concrete retaining wall, and the strength of the concrete retaining wall is maintained while maintaining the airtightness of the device itself for a long time. Can be maintained.

The elastic shock absorbing portion has a cylindrical support having a bottom and is located closest to the concrete retaining wall, and a head portion of the anchor bolt is penetrated inside the support. And an elastic body on which the metal spacer is mounted on the upper surface. The impact vibration is absorbed by the elastic body to prevent the impact vibration from being directly applied to the head portion of the anchor bolt, thereby preventing the anchor bolt from breaking or the like. In addition, the support body is brought into close contact with the concrete retaining wall surface by the elasticity of the elastic body, so that the oil and the like filled therein do not leak, and maintenance and adjustment of the fixing nut can be performed while maintaining the lubricating property inside.

Further, the elastic body is made of a rubber member.
An elastic body having excellent elasticity and a small shape can be manufactured at low cost, and the device itself can be downsized.

Further, the elastic body is made of a spring member.
The manufacturing cost can be reduced by using an off-the-shelf spring member at low cost.

Further, a protective cap for covering and protecting the head portion of the internal anchor bolt, a fixing nut, an elastic body and the like is screwed and fixed to the support. The internal members are lubricated while a lubricant such as oil is stored and accommodated in the support from the protective cap, thereby preventing contamination, rust and deterioration. In addition, the protective cap can be easily removed from the support, so that maintenance and inspection of the inside can be easily performed.

A bag in which a lubricant is sealed is inserted into the protective cap, and the protective cap has a small hole for bursting the bag with a needle or the like and filling the inside with the lubricant. A hole is made. It can be easily carried to the work site, and the lubricant such as oil can be safely injected into each protective cap on the concrete retaining wall inclined at a steep angle.

[0019]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1, 2 and 3 show an anchor bolt device 10 for fixing a retaining wall according to an embodiment of the present invention. As is apparent from the drawing, the anchor bolt device 10 for fixing the retaining wall is driven into the rock 12 through the concrete retaining wall 14 cast on the rock 12, and the head portion 16 projects to the outer surface side of the retaining wall. Anchor bolt 18 and the outer surface 20 of the concrete retaining wall 14
8 and an elastic shock absorbing portion 22 for elastically absorbing or mitigating an impact applied to the anchor bolt 18, and being engaged with a head end side of the anchor bolt 18, A fixing nut 24 pressed against the upper surface of the elastic shock absorbing portion 22;

As shown in FIG. 6, the bedrock 12 is, for example, a bedrock after excavating a surface soil on a slope on a side of a road 26.
In order to prevent the rock 12 from collapsing, a concrete retaining wall 14 is cast in a well shape on the surface of the rock 12 using cast-in-place concrete. Although the concrete retaining wall 14 has a well shape in the embodiment, the concrete retaining wall 14 is not necessarily limited to the well shape and may be formed in a hollow frame shape such as a polygon such as a circle or a hexagon. As shown in FIG. 1, the anchor bolt 18 has a length of about 3 m to about 10 to 20 m, and a male screw 28 is engraved on the upper end of the anchor bolt 18. The anchor bolt 18 is driven in using an appropriate anchor bolt depending on the properties of the rock 12 and the concrete retaining wall 14 cast into the rock 12, and the head 16 of the anchor bolt 18 on which the male screw 28 is cut is concreted. It protrudes from the outer surface 20 of the retaining wall 14.

As shown in FIGS. 1 and 2, the elastic shock absorbing portion 2
Reference numeral 2 denotes a substrate 30 laid on the periphery of the head portion 16 of the anchor bolt 18 protruding from the outer surface 20 of the concrete retaining wall 14, and mounted on the upper surface of the substrate 30 such that the head portion 16 is located at the center. A support 32 having a bottomed cylindrical shape, and is supported inside the support 32 while being penetrated by the head portion 16 of the anchor bolt.
The elastic body 34 on which the fixing nut 24 is mounted via 3
And Further, a protective cap 36, which will be described later, is screwed and fixed to the upper end of the support 32 to protect the fixing nut 24 and the elastic body 34.

The substrate 30 and the support 32 are formed of a corrosion-resistant metal, for example, an aluminum alloy. The lower surface of the support 32 is evenly adhered to the upper surface of the smooth substrate 30 to improve watertightness. 1, 2, and 4
As shown in (1), the support 32 is formed in a cylindrical shape, and a circumferential receiving portion 40 for receiving the elastic body 34 is provided at an intermediate height position of the inner peripheral surface 38 thereof. A plurality of oil grooves 42 for pouring and storing a lubricant such as oil into the support 32 are opened from the inner peripheral surface 38 to the upper surface side of the circumferential receiving portion 40.

A circumferential groove 44 is provided on the lower surface of the support 32, and a packing ring 46 is inserted into the circumferential groove 44 so that the lower surface of the support 32 mounted on the substrate 30 and the substrate 30
And increase the watertightness. This packing ring 46
It consists of an O-ring made of synthetic rubber, synthetic resin or the like.
Further, a male screw 48 for screwing and fixing the protective cap 36 is engraved on the outer peripheral surface of the upper end of the support 32, and a circumferential groove 50 is opened at the lower end thereof, and the packing ring 52 is inserted. ing. The support 32 is formed in a cylindrical shape, but is not necessarily limited thereto.
It may be formed in a polygonal cylindrical shape such as a hexagonal cylindrical shape.

As shown in FIGS. 1, 2 and 4, the elastic body 34 is made of an elastic rubber member, for example, rubber, synthetic rubber, or the like. Receiving part 40
And is formed in an elastic cylindrical body 54 having a height protruding from the upper surface of the support 32. This elastic cylinder 5
4, a metal spacer 33 is mounted on the upper surface, and the male screw 2 of the head 16 of the anchor bolt 18 is mounted on the upper surface thereof.
A fixing nut 24 fastened to 8 is pressed. Thus, even if a tensile stress or a shearing stress due to impact vibration is applied to the anchor bolt 18 in the concrete retaining wall 14 due to crustal deformation or the like, the elastic body 34 of the elastic shock absorbing part 22 absorbs the strain while expanding and contracting and anchors. Breakage of the bolt 18 or cracking of the concrete retaining wall can be prevented.

Further, since the elasticity of the elastic body 34 against which the fixing nut 24 is pressed against the upper surface is applied to the support 32,
The support body 32 can keep the lubricating properties of the anchor bolts 18 and the fixing nuts 24 for a long time without leaking the oil stored inside the substrate 30 under high pressure. Furthermore,
The elastic body 34 is formed of a rubber member and has excellent elasticity, and can be formed into a small-sized elastic cylindrical body 54, so that the shape of the device itself can be reduced. In addition, the elastic body 34 is not limited to a cylindrical body shape, but may match the shape of the support body 32, for example, a square cylindrical shape,
It is formed into a polygonal cylinder such as a hexagonal cylinder.

As shown in FIGS. 1 and 4, the fixing nut 24 has a spherical portion 56 projecting downward on the lower surface thereof. The metal spacer 33 that tiltably contacts the lower surface of the fixing nut 24 is made of a thick steel plate, a corrosion-resistant steel plate, or the like, and has a through hole 58 at the center position for passing the head portion 16 of the anchor bolt 18. The metal spacer 33 is formed in an open donut shape.
The spherical portion 5 of the fixing nut 24 around the through hole 58
The spherical receiving portion 60 that engages and supports the tiltable portion 6 is formed in a concave shape.

The metal spacer 33 is mounted on the upper surface of the elastic body 34 by connecting the through hole 58 of the metal spacer 33 to the head 16 of the anchor bolt 18, and then a fixing nut is attached to the upper end of the head 16. The spherical portion 56 on the lower surface of the fixing nut 24 is brought into close contact with the spherical receiving portion 60 of the metal spacer 33 by screwing the screw 24.

Accordingly, even if the axis of the head portion 16 of the anchor bolt 18 is inclined and displaced from the axis P1 to the axis P2 as shown in FIG. 5, for example, as shown in FIG. 24 and metal spacer 33
The elastic body 34 is compressed while being inclined obliquely downward crossing the axis P2 substantially perpendicularly, and the elastic body 34 absorbs the tilt distortion. At this time, the support 32 that has received the elastic body 34 moves sideways without tilting while maintaining a state in which it is in close contact with the substrate 30 laid on the outer surface 20 of the concrete retaining wall 14. The leakage of lubricant such as oil stored inside can be prevented while maintaining the watertightness of the protective cap 36 screwed and fixed to the inside for a long time.

A spherical portion 56 projecting from the lower surface of the fixing nut 24 and a spherical receiving portion 60 formed in the metal spacer 33 so as to engage and support the spherical portion 56 freely.
The configuration is not necessarily limited to this. For example, the spherical portion 56 is protruded on the upper surface of the metal spacer 33 and the spherical receiving portion 60 is recessed on the lower surface of the fixing nut 24. It may be engaged and supported. In the embodiment, the elastic body 34 is disposed immediately below the metal spacer 33 having the concave spherical receiving portion 60 which is in close contact with and receives the protruding spherical portion 56 on the lower surface of the fixing nut 24, thereby ensuring the impact. Although it can be absorbed, particularly in this embodiment, the upper surface of the elastic body 34
2 is provided higher than the peripheral step. In this way, even when the anchor bolt is tilted due to a natural state or the like, the impact is reliably absorbed by the elastic body 34, and the elastic body 34 is securely positioned so as not to be detached from the support 32. The shock absorption and mitigation action is ensured.

The elastic body 34 may be a spring member such as a coil spring (not shown). This spring member is also supported on the upper surface of the circumferential receiving portion 40 in the support body 32 and protrudes above the support body 32, and a metal spacer 33 is interposed on the upper surface of the spring member above the support body 32. The fixing nut 24 is screwed and fixed to the head portion 16 of the anchor bolt 18.

Thus, even when the elastic member 34 is a spring member, even if a tensile stress or a shear stress is applied to the anchor bolt 18 due to impact vibration, the elastic member 34 formed of the spring member absorbs the strain while performing the expansion and contraction operation. As a result, breakage of the anchor bolt 18 or cracking of the concrete retaining wall surface can be prevented, and even if the axis of the anchor bolt 18 is inclinedly displaced, the support 32 does not tilt and is screwed to the support 32 and the support. Leakage of lubricants such as oil stored inside can be prevented while maintaining water tightness in the fixed protective cap 36 for a long period of time. In addition, a spring member such as a coil spring can reduce manufacturing costs by using off-the-shelf components at low cost.

As shown in FIGS. 1, 2 and 3, the head 16 of the anchor bolt 18, the fixing nut 24, the elastic body 3
The protection cap 36 for protecting the 4 etc. while covering it,
Similarly to the support 32, it is made of a corrosion-resistant metal, for example, an aluminum alloy or the like, and is formed in a hollow hanging bell shape. On the inner surface of the open end of the protective cap 36, a female screw 62 screwed with the male screw 48 formed on the outer periphery of the upper end of the support 32 is formed.

The protective cap 36 is screwed and fixed to the support 32, and a lubricant such as oil is stored and stored in the support 32 from the protective cap 36, and the head portion 16 of the internal anchor bolt 18 and the fixing nut 24 are stored therein. , Lubricating the elastic body 34 and the like, thereby preventing contamination and rusting of each member on the inner side. Further, the protective cap 36 is easily removed from the support 32, and maintenance and inspection of the internal head 16, the fixing nut 24, the elastic body 34, and the like can be easily performed.

Into the protective cap 36, a bag body 64 made of a resin film and filled with a lubricant such as oil and expanded is inserted. In addition, protective cap 3
At the top of the small hole 6, a small hole 6 is formed to burst the bag body 64 with a needle 68 or the like to fill the protective cap 36 with the lubricant in the bag body.
6 is open. The small hole 66 is not limited to the top of the head, and may be opened, for example, in the temporal region.

Thus, the bag body 64 in which the lubricant is sealed is easy to carry, and while the worker easily carries the climbing to the concrete retaining wall 14 inclined at a steep angle, the inside of each protective cap 36 is removed. , The protective cap 36 is screwed and fixed to the support 32, and then the needle 68 is inserted from the outside of the small hole 66 to rupture the bag 64, and it is extremely easy to remove lubricant such as oil. In addition, the injection can be performed in a short time without leakage, and the danger in the injection operation of the lubricant can be prevented.

Next, the operation of the anchor bolt device 10 for fixing a retaining wall according to the present invention will be described. As shown in FIG. 6, the anchor bolt device 10 for fixing the retaining wall is provided on the rock 12 after excavating the surface soil on the slope on the side of the road 26.
Concrete retaining wall 14 is cast in a well shape or the like with cast-in-place concrete on the surface in order to prevent collapse of concrete, and concrete retaining wall 14 is formed into a well shape in order to firmly fix concrete retaining wall 14 to bedrock 12. An anchor bolt 18 is driven into the bedrock 12 from the upper surface side such as the intersection of the wall 14 and fixed, and is installed on the head portion 16 of the anchor bolt 18 protruding from the outer surface 20 of the concrete retaining wall 14.

On the outer surface 20 of the concrete retaining wall 14 from which the head portion 16 of the anchor bolt 18 protrudes,
0, the support 32 is mounted on the upper surface of the substrate 30, the elastic body 34 is inserted into the support 32, and the metal spacer 33 is mounted on the upper surface of the elastic body 34. 16 and a fixing nut 24 is screwed and fixed to the metal spacer 3.
3 is pressed against the upper surface of the elastic body 34. Thereafter, the protective cap 36 in which the bag body 64 in which the lubricant is sealed and expanded is screwed and fixed to the support 32, and the needle 68 is inserted from the outside of the small hole 66 of the protective cap 36 into the bag. The body 64 is ruptured and the lubricant inside flows down into the fixing nut 24 and the metal spacer 33 in the protective cap 36. The lubricant is supplied from the oil groove 42 provided on the inner peripheral surface of the support 32 to the support 3.
2, and the substrate 30 is also stored on the upper surface side.

Thus, even if tensile stress or shear stress due to impact vibration is applied to the anchor bolts 18 in the concrete retaining wall 14 due to crustal deformation, the elastic body of the elastic shock absorbing portion 22 of each retaining wall fixing anchor bolt device 10. It is possible to prevent the anchor bolt from being broken by absorbing the strain caused by each stress while the telescopic operation is performed, and it is possible to prevent the concrete retaining wall 14 from coming off the bedrock and slipping down, thereby increasing the service life.

Further, even if the axis of the head portion 16 of the anchor bolt 18 is inclined and displaced by the impact vibration applied to the concrete retaining wall 14, the elastic body 34 is compressed to absorb the inclination distortion, and the support 32 tilts. Instead, it moves sideways while keeping the concrete retaining wall 14 in close contact with the substrate 30, while maintaining the watertightness of the support 32 and the protective cap 36 screwed to the support 32 for a long time. Lubricant such as oil stored inside does not leak.

Accordingly, the fixing nut 24, which has been loosened while the protective cap 36 is periodically removed and inspected, without the rusting of the fixing nut 24 and the head portion 16 of the anchor bolt 18, is tightened again. Thus, the fixed state of the concrete retaining wall 14 to the bedrock 12 by the anchor bolt 18 can be maintained. Also, in the injection of a lubricant such as oil into the support body 32 and the protective cup 36, it is necessary for an operator to climb a steep retaining wall while holding a heavy can body containing a lubricant such as oil in one hand. Many bags 64 in which a lubricant is sealed are accommodated in a suitable lowering bag and hung on a waist band or the like, and the worker can use the hands freely without danger of falling down the concrete retaining wall 14. Can climb safely. Further, at the position of each retaining wall fixing anchor bolt 10, the protective cap 36 is detached, the bag 64 taken out from the lower bag is inserted into the inside, the bag 64 is ruptured with a needle or the like, and the internal fixing nut is removed. 24, the metal spacer 33, the elastic body 34 and the like can be easily injected with a lubricant.
The support 32 is stored in the support 2 and is closely adhered to the substrate 30 by the elastic body 34, so that the support 32 can maintain the lubricating properties of the internal members while being stored for a long time without leaking. In addition, the anchor bolt device 10 for retaining wall fixing uses the fixing nut 24 and the elastic shock absorbing portion 22 without using a large spherical washer or the like.
The use of regulated parts is possible, the structure is simple, the manufacturing cost is low, and the construction cost of the concrete retaining wall is low.

[0041]

As described above, according to the anchor bolt device for retaining wall fixing according to the present invention, the anchor bolt device is driven into the rock through the concrete retaining wall cast into the rock, and the head is placed on the outer side of the retaining wall. An anchor bolt having a projecting portion, an elastic shock absorbing portion installed on the outer surface of the concrete retaining wall so as to surround a head portion of the anchor bolt, and elastically absorbing an impact applied to the anchor bolt; A fixing nut fixed to the head end side of the anchor bolt and pressed against the upper surface of the elastic shock absorbing portion, wherein the fixing nut has a spherical portion on the lower surface side, and the fixing nut A metal spacer is interposed between the elastic spacer and the elastic shock absorbing portion, and the metal spacer has a spherical receiving portion on its upper surface side for engaging and supporting the spherical portion of the fixing nut so as to tilt freely. By Even if impact vibration is applied to the anchor bolts inside the concrete retaining wall due to crustal deformation, etc., the impact vibrations are absorbed by the elastic shock absorbing parts and breakage of the anchor bolts or deterioration due to cracks, or deterioration of the concrete retaining wall Cracking can be prevented, and the service life of the concrete retaining wall is improved. In addition, the elastic shock absorber has elasticity, so even if shock vibration is applied, the degree of adhesion to the concrete retaining wall does not decrease, there is no leakage of oil filled inside, and it can be fixed for a long time. Lubricity of nuts and anchor bolts can be maintained. Further, the apparatus itself does not use a large spherical washer or the like, the structure is simple, and the construction cost of the concrete retaining wall can be reduced using off-the-shelf components.
In addition, even if the head of the anchor bolt is tilted and deformed due to impact vibration applied to the concrete retaining wall, the lower surface of the elastic shock absorbing part can be in close contact with the concrete retaining wall while absorbing the tilt distortion by the elastic shock absorbing part. The strength of the concrete retaining wall can be maintained while maintaining the airtightness of the concrete for a long time.

Further, the elastic shock absorbing portion has a bottomed cylindrical support member located closest to the concrete retaining wall, and a head portion of the anchor bolt penetrated inside the support member. And an elastic body having the metal spacer mounted on the upper surface thereof, so that the impact vibration generated on the concrete retaining wall is absorbed by the elastic body and the impact vibration is directly applied to the head portion of the anchor bolt. The anchor bolt can be prevented from being broken by preventing the anchor bolt from being applied, and the service life can be increased. In addition, the support is adhered to the concrete retaining wall surface by the elasticity of the elastic body, the airtightness in the elastic shock absorbing portion is improved, and the filled oil and the like do not leak, while maintaining the internal lubricity by the oil and the like. No corrosion degradation occurs.

Further, since the elastic member is made of a rubber member, the elastic member is excellent in elasticity and small in shape, and can be manufactured at low cost, and the device itself can be downsized.

Further, since the elastic body is made of a spring member, the manufacturing cost can be reduced by using a ready-made spring member at low cost.

Further, a protective cap for covering and protecting the head portion of the internal anchor bolt, a fixing nut, an elastic body and the like is screwed and fixed to the support, so that the support cap is supported by the protective cap. While storing and storing a preservative such as oil in the body, the head portion of the internal anchor bolt, the fixing nut, the elastic body and the like are lubricated, so that the internal members are not contaminated or deteriorated. Further, the protective cap is easily removed from the support, and maintenance and inspection of the internal head portion, the fixing nut, the elastic body, and the like can be easily performed.

A bag in which a preservative is sealed is inserted into the protective cap, and a small hole for filling the preservative into the bag by bursting the bag with a needle or the like is inserted into the protective cap. The bag body, which has been opened and is expanded by enclosing a preservative inside, is convenient to carry.While carrying the bag body on a concrete retaining wall inclined at a steep angle, the bag body is placed in each protective cap. A preservative such as oil can be injected while being inserted and ruptured with a needle, and the injection operation can be performed safely in a short time. Further, the preservative such as the injected oil does not leak to the outside, and the internal lubrication can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a retaining wall fixing anchor bolt device according to the present invention.

FIG. 2 is a plan view in which a part of a retaining wall fixing anchor bolt device with a protective cap removed has been cut away.

FIG. 3 is a front view of a retaining wall fixing anchor bolt device.

FIG. 4 is an exploded perspective view of a support and an elastic body of the elastic shock absorbing portion, a fixing nut, a metal spacer, and the like.

FIG. 5 is a longitudinal sectional view of the anchor bolt device for fixing a retaining wall showing a state where a head portion of the anchor bolt is inclined.

FIG. 6 is a perspective view showing a concrete retaining wall cast in place on a rock on a road slope.

FIG. 7 is a longitudinal sectional view of a conventional anchor bolt device for retaining wall fixing.

[Explanation of symbols]

 10 Anchor bolt device for retaining wall fixing. 12 Rock Mass 14 Concrete Retaining Wall 16 Head 18 Anchor Bolt 20 Outer Surface of Concrete Retaining Wall 22 Elastic Shock Absorber 24 Fixing Nut 32 Support 33 Metal Spacer 34 Elastic Body 36 Protective Cap 56 Spherical Part 60 Spherical Receiver 62 Bag 64 Small hole

Claims (6)

(57) [Claims] 1. An anchor bolt which is driven into a bedrock through a concrete retaining wall cast in the bedrock, and has a head portion protruding on an outer surface side of the retaining wall; An elastic shock absorbing portion that is installed to surround the head portion and elastically absorbs an impact applied to the anchor bolt; and is engaged with a head end side of the anchor bolt and pressed against an upper surface of the elastic shock absorbing portion. A fixing nut, which is provided with a spherical portion on the lower surface side thereof,
A metal switch is provided between the fixing nut and the elastic shock absorber.
A spacer is interposed , and the metal spacer has a ball of the fixing nut on its upper surface side.
An anchor bolt device for fixing a retaining wall, comprising a spherical receiving portion that engages and supports a surface portion so as to be freely inclined . 2. The bottomed cylindrical support member, which is disposed closest to the concrete retaining wall,
2. An anchor bolt for retaining wall fixing according to claim 1, further comprising: an elastic body which is supported inside the support body while being penetrated by a head part of the anchor bolt, and on which an upper surface of the metal spacer is mounted. apparatus. 3. The anchor bolt device according to claim 2, wherein the elastic body is made of a rubber member. 4. The anchor bolt device according to claim 2, wherein said elastic body is made of a spring member. 5. A protective cap for covering and protecting a head portion of an internal anchor bolt, a fixing nut, an elastic body, and the like, is screwed and fixed to the support.
The anchor bolt device for retaining wall fixing according to the above. 6. A bag in which a lubricant is sealed is inserted into the protective cap, and the protective cap has a small hole for bursting the bag with a needle or the like and filling the inside with the lubricant. The anchor bolt device for retaining wall fixing according to claim 5, wherein the anchor bolt device is formed with holes.