JP2689236B2 - 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 firmly fixing a concrete retaining wall cast on a rock such as 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. In this molded concrete retaining wall, the head of the anchor bolt is projected from the concrete retaining wall by driving the anchor bolt into the bedrock through the concrete retaining wall from the surface at a required interval and As shown in Fig. 7, the base plate is laid on the retaining wall at the position of the part, the spherical washer and the receiving plate are installed, and the tightening nut is screwed onto the head part of the anchor bolt protruding upward from the receiving plate. Then, the backing plate is fixed to prevent the concrete retaining wall from peeling off from the bedrock and sliding off. Further, the tightening nut causes loosening with respect to the anchor bolt due to displacement of the concrete retaining wall with respect to the rock during long-term use, and it is necessary to adjust the tightening again.
For this reason, in order to maintain the watertightness of the anchor bolt and the tightening nut and prevent rusting due to oil leakage, etc., a protective cap is mounted on the upper surface side of the receiving plate and the supporting plate in the protective cap is mounted. The bolt hole provided in the above is screwed into the head end portion of the anchor bolt so that the opening end of the protective cap is brought into close contact with the receiving plate.

[0003]

However, in the above anchor bolt device, since the fastening nut screwed to the head portion of the anchor bolt is directly fixed on the upper surface of the receiving plate fixed to the spherical washer, A load load is applied to the head part protruding from the concrete retaining wall due to crustal movement, etc. in the direction intersecting the head part and in the direction along the longitudinal direction, and these load loads cannot be properly absorbed by the spherical washer attached to the head part. As a result, the head part may be broken or cracked to lower the durability of the concrete retaining wall, and there is a risk of peeling off from the bedrock and slipping off. In addition, the tightening nut loosens from the head portion during long-term use, and the watertightness inside the protective cap decreases, and the watertightness of the joint surface between the substrate and the concrete retaining wall is low, so the oil filled inside leaks, There was a problem that rust occurred on the spherical washer, head, fastening nut, etc., making maintenance and inspection after construction difficult.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to appropriately absorb and relax a load applied to the head portion due to crustal movement or the like, thereby causing breakage or cracks in the head portion. , The durability of the concrete retaining wall can be maintained for a long time, the fixing nut that is fastened to the head part does not loosen, the watertightness inside the protective cap can be maintained for a long time, and maintenance and inspection of each member is easy and the device itself An object of the present invention is to provide an anchor bolt device for fixing a retaining wall, which is characterized by long-term durability.

[0005]

In order to achieve the above object, the invention according to claim 1 penetrates through a concrete retaining wall 14 cast on a bedrock 12 to be driven into the bedrock, and the concrete retaining wall Anchor bolt 18 having a head portion 16 protruding toward the outer surface 20 of 14 and the concrete retaining wall 1
4, a support portion 22 installed around the head portion 16 on the outer surface 20, and an elastic shock absorbing portion 24 mounted on the support portion 22 and elastically absorbing stress applied to the head portion 16. , The fixing nut 2 screwed onto the upper end side of the head portion 16 and pressed against the upper surface side of the elastic shock absorbing portion 24.
6 and the supporting portion 22 includes the elastic shock absorbing portion 2
4, the head portion 16 is penetrated and the movable support body 40 having the spherical surface portion 38 on the lower surface side is slanted while the spherical support portion 38 is slidably contacted with the movable support body 40. An anchor bolt device 10 for fixing a retaining wall, which comprises a substantially cylindrical lower stage support body 44 having a spherical receiving portion 42 that is freely supported on the upper surface thereof.

According to the second aspect of the invention, the concrete retaining wall 14 is provided with a substrate 32 surrounding the head portion 16 and supporting the lower surface of the lower support body 44. On the lower surface side, a concrete retaining wall 14
The adhesive sealing material 34 fixed to the above may be provided.

Further, in the invention according to claim 3, the elastic shock absorbing portion 24 is supported by the movable supporting member 40 and is inserted into the head portion 16 of the anchor bolt 18 so as to penetrate therethrough.
6, the metal spacer 68 provided on the lower surface side of the fixing nut 26 may be pressed against the upper surface of the elastic body 66.

Further, in the invention according to claim 4, a plurality of lubricant flow-down grooves 48 may be provided in the spherical surface receiving portion 42 of the lower stage support member 44.

Further, in the invention according to claim 5, a protective cap is provided on the lower stage support member 44 to cover and protect the head portion 16 of the anchor bolt 18 inside, the fixing nut 26, the elastic body 66 and the like. 72 may be screwed together.

[0010]

The anchor bolt device for fixing a retaining wall according to claim 1 of the present invention penetrates into a concrete retaining wall placed on a rock and is driven into the rock, and a head portion is projected to the outer surface side of the concrete retaining wall. Anchor bolts, a supporting portion that surrounds the head portion on the outer surface of the concrete retaining wall, and an elastic shock that is mounted on the supporting portion and elastically absorbs the stress applied to the head portion. An absorbing part; and a fixing nut screwed onto the upper end side of the head part and pressed against the upper surface side of the elastic shock absorbing part, wherein the supporting part is on the lower surface side of the elastic shock absorbing part. In addition, a movable support body having a spherical surface portion on the lower surface side through which the head portion penetrates, and a spherical support portion for supporting the movable support body in a freely tiltable manner while sliding the spherical surface portion in a close contact state on the upper surface. And a substantially cylindrical lower stage support body which is recessed That. When a load is applied in the direction intersecting the head due to crustal movement and the head is laterally displaced, the fixing nut, the elastic shock absorber, and the movable support are tilted diagonally downward while the lower surface of the movable support is It is possible to prevent the spherical portion from sliding along the spherical receiving portion of the lower stage support body to disperse and absorb the load load applied to the head portion and attenuate the load, thereby preventing breakage and cracks on the base side of the head portion. When a load is applied to the upper end of the head in the longitudinal direction through the support of the head, elastic shock absorbers, fixing nuts, etc., the elastic shock absorbers are evenly compressed and the tensile stress is dispersed and absorbed. Similarly, it is possible to prevent breakage and cracks from occurring on the base side of the head portion. Further, it is possible to prevent the elastic shock absorbing portion and the supporting portion from breaking and deteriorating without applying excessive stress to a part of the elastic shock absorbing portion and the supporting portion.

According to a second aspect of the present invention, the concrete retaining wall is provided with a substrate surrounding the head portion and supporting the lower surface of the lower stage support, and the concrete is provided on the lower surface side of the substrate. An adhesive sealing material fixed to the retaining wall is provided. The adhesive sealing material on the lower surface of the substrate adheres to the upper surface of the concrete retaining wall, and even if the retaining wall is a rough rough surface, watertightness can be maintained, and the filled lubricant does not leak to the outside. The lubricity of can be maintained for a long time. Further, the supporting portion and the elastic shock absorbing portion can be stably installed on the concrete retaining wall surface to disperse and absorb the load applied to the head portion.

According to a third aspect of the present invention, the elastic shock absorbing portion is provided with an elastic body supported by the movable support body and inserted through the head portion of the anchor bolt. A metal spacer provided on the lower surface side of the fixing nut is pressure-welded. The metal spacer and the elastic body evenly disperse and absorb the load applied to the upper end side in the longitudinal direction of the head portion to prevent breakage of the base portion side of the head portion, and at the same time, excessive stress is applied to a part of the elastic body. It is also possible to prevent the elastic body from being broken and deteriorated without adding thereto. In addition, the elasticity of the elastic body is applied to the substrate, the adhesive sealing material on the lower surface of the substrate is brought into close contact with the concrete retaining wall surface under high pressure, and its watertightness becomes high, and the oil etc. stored in the lubricant reservoir hole of the substrate The lubricant does not leak, and the lubricity of the member can be maintained for a long time.

According to a fourth aspect of the present invention, a plurality of lubricant flow-down grooves are provided in the spherical surface receiving portion of the lower support. The injected lubricant flows down the lubricant flow-down groove of the lower support and is stored in the reservoir hole of the substrate.The flow-down groove is used to lubricate the head part, the fixing nut, the support part, etc. It is possible to prevent deterioration due to contamination and rusting of members.

According to a fifth aspect of the present invention, a protection cap for protecting the head portion of the anchor bolt, the fixing nut, the elastic body and the like while covering the inner portion of the anchor bolt is screwed and fixed to the lower support. There is. A protective cap prevents contamination of each member such as the head, fixing nut, and elastic body, and lubricants such as oil stored inside lubricate each member for a long period of time to prevent deterioration due to rust etc. . Also, you can easily remove the protective cap from the lower support to maintain the inside,
Inspection can be done easily.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. 1, FIG. 2, FIG. 3, and FIG. 4, an anchor bolt device for fixing a retaining wall according to an embodiment of the present invention (hereinafter,
Abbreviated as "anchor bolt device". ) 10 is shown. As is clear from the figure, the anchor bolt device 10
Is an anchor bolt 18 that penetrates a concrete retaining wall 14 that is cast into the rock 12 and is driven into the rock 12, and the head portion 16 is projected to the outer surface side of the concrete retaining wall 14.
And a supporting portion 22 installed around the head portion 16 on the outer surface 20 of the concrete retaining wall 14, and a stress placed on the supporting portion 22 and elastically absorbing stress applied to the head portion 16. Elastic shock absorbing portion 24 and the head portion 16
And a fixing nut 26 that is screwed onto the upper end of the elastic shock absorber 24 and is pressed against the upper surface of the elastic shock absorber 24.

As shown in FIG. 6, the bedrock 12 is, for example, the bedrock after excavating and removing the surface soil on the slope of the road 28. In order to prevent the bedrock 12 from collapsing, the surface of the bedrock 12 is prevented. The concrete retaining wall 14 is cast in a well shape with cast-in-place concrete. This concrete retaining wall 14
Although the well shape is shown in the embodiments, the shape is not necessarily limited to the well shape, and the well shape may be formed into a polygonal hollow frame such as a circle or a hexagon. The anchor bolt 18 is driven into the upper surface side of the intersecting portion of the well-shaped concrete retaining wall 14 and has a length of about 3 m to 10 to 20 m, and the male screw 30 is engraved on the upper end of the anchor bolt 18. Has been done. The anchor bolt 18 is driven by using an appropriate anchor bolt depending on the state of the rock bed 12 and the concrete retaining wall 14 cast on the rock bed 12, and the head portion 16 of the anchor bolt 18 on which the male screw 30 is engraved is concreted. It projects from the outer surface 20 of the retaining wall 14.

As shown in the figure, a substrate 32 is provided on the outer surface 20 of the concrete retaining wall 14 so as to surround the head portion 16 and stably support the lower surface of the support portion 22,
The substrate 32 has the adhesive sealing material 3 provided on the lower surface side thereof.
It is fixed to the concrete retaining wall 14 at 4. The substrate 32 is formed of a substantially rectangular flat plate made of a corrosion-resistant metal, for example, an aluminum alloy, and a reservoir hole 36 for a lubricant such as oil for lubricating the anchor bolt 18 and the support portion 22 is opened at a central position thereof. Is perforated. The adhesive sealing material 34 has, for example, butyl rubber, a saturated polymer, an activated resin, and the like as main components, and has flexibility and adhesiveness. A release paper (not shown) is attached to the front surface side of the adhesive sealing material 34.

As a result, the operator peels off the release paper attached to the adhesive sealing material 34 on the lower surface of the substrate 32 at the position of each head portion 16 of the concrete retaining wall 14 cast on the steeply sloping rock 12. Then, the substrate 32 can be easily fixed to the outer surface 20 of the concrete retaining wall 14 so as to surround the head portion 16. Since the adhesive sealing material 34 is excellent in flexibility and adhesiveness, even if the outer surface 20 of the concrete retaining wall 14 is a rough uneven surface, the substrate 32 is adhered and adhered accordingly.
The watertightness of the joint surface between the concrete retaining wall 14 and the concrete retaining wall 14 can be maintained, the lubricant such as oil stored in the lubricant reservoir hole 36 of the substrate 34 does not leak to the outside, and the lubricity of each member can be maintained for a long time. You can maintain the migration. Although the substrate 32 is shown as a quadrangular plate in the embodiment, it is not limited to this and may be formed as a circular plate, a polygonal plate such as a hexagonal plate, and in short, a wide plate that can stably support the support portion 22. You just have to have

As shown in FIG. 1, FIG. 3 and FIG.
Like the substrate 32, is made of a corrosion-resistant metal, for example, an aluminum alloy, and is on the lower surface side of the elastic shock absorbing portion 24, and the head portion 16 is penetrated,
A movable support body 40 having a spherical surface portion 38 on the lower surface side, and a spherical support portion 42 for freely tilting the movable support body 40 while slidably contacting the spherical surface portion 38 are provided in a concave shape on the upper surface. And a cylindrical lower support 44.

As shown in the drawing, the lower stage support member 44 is provided with a flat surface portion 45 along the upper edge of the spherical surface receiving portion 42 formed in the upper surface of the lower support member 44, and the lower surface of the lower surface supporting member 44 extends from the substantially central portion thereof. An approximately trapezoidal hole 46 is opened toward the lower surface of the support body 44. A plurality of lubricant flow-down grooves 48 are opened in the spherical receiving portion 42 from the upper edge side thereof toward the holes 46, and on the lower end side of the holes 46, the inner peripheral surface of the lubricant reservoir hole 36 of the substrate 32 is formed. A circumferential step portion 50 that is engaged is vertically provided. In addition, the lower support 4
4, a circumferential groove 52 is opened on the lower surface side and a packing ring 54 is inserted, and an outer screw 56 is engraved from the upper end side on the outer peripheral surface of the lower stage support body 44, and an open groove is formed on the lower end position of the male screw 56. A packing ring 60 is inserted in the formed circumferential groove 58. This packing ring is an O-ring made of synthetic rubber, synthetic resin or the like. As a result, the lower support 44 can prevent the positional deviation from the substrate 32 by engaging the circumferential step portion 50 on the lower surface side with the lubricant reservoir hole 36 of the substrate 32, and the packing ring 54 on the lower surface side. Watertightness with the substrate 32 is also improved.

The movable support member 40 is formed of a solid body having a hemispherical shape or a substantially half-moon shape in cross section, and a circular recess 62 for receiving the elastic shock absorbing portion 24 is formed on the upper surface thereof. A bolt hole 64 for penetrating the head portion 16 is opened from a substantially central position of the circular concave portion 62 to a central position of the spherical surface portion 38 on the lower surface side. The head portion 16 is passed through the bolt hole 64, and the spherical surface receiving portion 42 of the lower stage support body 44 slidably supports the spherical surface portion 38 of the movable support body 40. As a result, the movable support 40 is supported so as to be freely inclined with respect to the lower stage support 44, and the head portion 16
On the other hand, when a load is applied from the crossing direction and the upper end side of the head portion 16 bends in the lateral direction, the movable support body 40 moves in the spherical receiving portion 42 of the lower stage support body 44 in the same direction as the lateral deflection of the head portion 16. The shear stress applied to the base portion 100 of the head portion 16 that protrudes from the concrete retaining wall 14 while tilting toward can be absorbed and dissipated, and the base portion 1 of the head portion 16 can be absorbed.
It is possible to prevent breakage, cracks and the like from occurring in 00.

As shown in FIGS. 1 and 4, the elastic shock absorbing portion 2
4 includes an elastic body 66 supported by the movable support 40 and inserted through the head portion 16. The upper surface of the elastic body 66 has a fixing nut 26 screwed to the upper end side of the head portion 16.
A metal spacer 68 provided on the lower surface side of is pressed against.
The elastic body 66 is made of an elastic rubber member such as rubber or synthetic rubber, and is formed into a substantially cylindrical solid body that can be mounted in the circular recess 62 on the upper surface of the movable support 32. There is. Then, a bolt hole 64 for inserting the head portion 16 is formed so as to communicate with the central position of the upper and lower surfaces. The metal spacer 68 is made of a thick steel plate, a corrosion-resistant steel plate, or the like, and is formed in a donut shape with a through hole 70 for allowing the head portion 16 to pass therethrough. The through hole 70 of the metal spacer 68 is formed in the head portion 16
To contact the upper surface of the elastic body 66, and then the fixing nut 24 is screwed onto the upper end of the head portion 16 to press the metal spacer 68 into pressure contact with the upper surface of the elastic body 66.

As a result, a load is applied to the upper end side of the head portion 16 in the longitudinal direction of the head portion 16 in an attempt to separate the concrete retaining wall 14 from the bedrock 12 in the vertical direction due to crustal movement or the like, and the supporting portion 22, the elastic body 66, and the metal spacer 68. , Fixing nut 2
When a tensile stress or a compressive stress is applied to the base portion 100 of the head portion 16 through 6, etc., the metal spacer 68 and the elastic body 66 in pressure contact with the metal spacer 68 are
With its elasticity, the head part 1
The elastic body 66 receives the tensile stress and the compressive stress applied to the elastic member 6, and while the entire elastic body 66 is uniformly compressed, the tensile stress and the compressive stress applied to the head portion 16 are dispersedly absorbed to be attenuated.
It is possible to prevent the base portion 100 from breaking or cracking.

The elastic body 66 is supported by a movable support body 40 in which a lower spherical surface portion 38 is slidably adhered to a spherical surface receiving portion 42 of a lower support body 44, and a fixing nut 26 is fastened to an upper surface thereof. Since the metal spacers 68 are pressed against each other, when the base portion 100 side of the head portion 16 receives a shear stress and bends in the lateral direction, the movable support body 40 moves in the same direction along the spherical surface receiving portion 42 of the lower stage support body 44. Excessive stress is not applied to a part of the lower end side of the tilt of the elastic body 66 tilted toward and supported by the movable support body 40. Further, even when a tensile stress or a compressive stress is applied in the longitudinal direction of the head portion 16, the elastic body 66 held vertically in the head portion 16 acts evenly, and an excessive stress is not applied to a part of the elastic body 66. Body 6
It is possible to prevent breakage deterioration of No. 6 and maintain the durability of the device itself for a long time.

Further, the elastic force of the elastic body 66, which is pressed against the metal spacer 68 by the fixing nut 26 on the upper surface side, is applied to the substrate 32 from the movable support body 40 and the lower stage support body 44, and the lower surface of the substrate 32 is adhesively sealed. Material 34 is concrete retaining wall 1
4, the watertightness of which is drastically increased by closely adhering to the outer surface 20 of 4 to prevent the lubricant such as oil stored in the lubricant reservoir hole 36 of the substrate 32 from leaking and to be fixed to the head portion 16. Lubricity of the nut 26, the movable support 40, the lower support 44, and the like can be maintained for a long period of time, and maintenance inspection and adjustment can be easily performed. Further, the elastic body 66 is a rubber member having excellent elasticity and can be formed into a small columnar shape, and the shape of the apparatus itself can be made small, so that the anchor bolt apparatus 10 on the outer surface of the steeply inclined concrete retaining wall 14 can be formed. The safety of construction will increase.

The elastic body 66 is not limited to a solid cylinder, but may be a polygonal prism such as a quadrangular prism or a hexagonal prism. Further, the elastic body 66 is not limited to a rubber member, and a spring member such as a coil spring may be used. Accordingly, even when the elastic body 66 is a spring member, even if tensile stress, compressive stress, or shear stress is applied to the anchor bolt 18, the stress is dispersed by tilting the movable support, compressing the elastic body, or the like. It is possible to prevent the head portion 16 from breaking or cracking while absorbing.

As shown in FIGS. 1, 2 and 4, the lower support 44 has a protective cap for protecting the head portion 16 of the anchor bolt, the fixing nut 26, the elastic body 66, etc. while covering them. 72 is screwed and fixed. Similar to the lower support 44 and the like, the protective cap 72 is made of a corrosion-resistant metal, such as an aluminum alloy, as a material, and is formed in a hollow bell shape. On the inner surface side of the opening end of the protective cap 72, a female screw 74 which is screwed into the male screw 56 formed on the outer peripheral surface of the upper end portion of the lower support 44 is engraved, and a lubricant injection hole is formed on the crown. An opening 76 is formed so that a stopper 78 such as a bolt can be fastened.

The protective cap 72 is screwed and fixed to the lower support 44, and a lubricant such as oil is injected through the injection hole 76 of the protective cap 72. The injected oil flows down to the upper surface of the support portion 22, and the spherical receiving portion 42 of the lower stage support body 44.
Flowing down through the lubricant flow-down groove 48 provided in the base plate 32 and stored in the reservoir hole 36 of the substrate 32 to lubricate the head portion 16, the fixing nut 24, the elastic body 34, and the like in the protective cap 72. It is possible to prevent deterioration due to contamination and rusting of members. Further, the protective cap 72 can be easily removed from the lower support 44 to remove the head 16 and the fixing nut 2 inside.
4. Maintenance and inspection of the elastic body 34 and the like can be easily performed.

Instead of injecting oil from the injection hole 76, as shown in FIG. 1, a bag 80 in which a lubricant such as oil is enclosed and expanded is inserted into the protective cap 36, and the injection hole is inserted. The protective cap 72 may be filled with the lubricant in the bag body by inserting a needle or the like from 76 to burst the bag body 80. By using this bag body 80, a lubricant such as oil can be easily and quickly injected into the protective cap 72 of the anchor bolt device 10 provided on the outer surface of the concrete retaining wall 14 inclined at a steep angle in a short time without any leakage. Therefore, it is possible to prevent the danger of the lubricant injection work.

Next, the operation of the retaining wall fixing anchor bolt device 10 according to the present invention will be described. As shown in FIG. 6, the anchor bolt device 10 for fixing the retaining wall is formed on the rock bed 12 after excavating the surface soil on the side slope of the road 28.
In order to prevent the collapse of the concrete, the concrete retaining wall 14 is cast in a well shape or the like with cast-in-place concrete, and in order to firmly fix the concrete retaining wall 14 to the bedrock 12, a concrete retaining wall shaped in a well shape is formed. An anchor bolt 18 is driven into the bedrock 12 from the upper surface side such as a crossing position of the wall 14 and fixed therein, and the anchor bolt 18 is installed on the head portion 16 of the anchor bolt 18 projected on the outer surface 20 of the concrete retaining wall 14.

A substrate 32 is attached to the outer surface 20 of the concrete retaining wall 14 from which the head portion 16 of the anchor bolt 18 is projected.
Is fixed by an adhesive sealing material 34 on the lower surface side, and the substrate 3
On the upper surface of 0, the lower stage support body 44 is inserted and mounted on the head portion 16, and the spherical surface portion 38 of the movable support body 40 is slidably adhered to the spherical surface receiving portion 42 of the lower stage support body 44. An elastic body 66 and a metal spacer 68 are sequentially inserted into and mounted on the head portion 16 on the upper surface of the body 44, and the fixing nut 26 is screwed and fixed to the head portion 16 to attach the metal spacer 33 to the elastic body 66.
Pressure contact with the upper surface. Further, after the protective cap 72 is screwed into the lower support 44, a lubricant such as oil is injected through the injection hole 76 at the top of the protective cap 72 to screw the stopper 78. This lubricant flows down to the fixing nut 26, the metal spacer 68, and the upper surface of the lower stage support body 44, and further from the flow-down groove 48 provided in the spherical surface receiving portion 42 of the lower stage support body 44 to the substrate 3.
It flows to the second accumulation hole 36 and is stored therein.

In this state, the concrete retaining wall 14 moves laterally with respect to the bedrock 12 as indicated by the arrow due to the crustal movement, etc.
When shearing stress is applied to the head portion 16 of the anchor bolt in a lateral direction, and the axis line of the head portion 16 is displaced from the axis line P1 to the axis line P2 as shown in FIG. The spherical portion 38 of the lower support 44 slides along the spherical receiving portion 42 of the lower support 44 and inclines obliquely downward so as to intersect substantially perpendicularly with the axis P2, and the elastic body 66 and the metal spacer 68 on the upper surface side of the movable support 40. The fixing nuts 26 and the like are also displaced obliquely downward so as to intersect substantially perpendicularly with the axis P2 to disperse and absorb the shear stress applied to the base portion 100 of the head portion 16 so as to be attenuated. It can be prevented from occurring. At the same time, since the elastic body 66 supported by the movable support body 40 is also displaced diagonally downward like the movable support body 40, it is possible to prevent breakage deterioration of the elastic body 66 without applying excessive stress to a part of the elastic body 66. Also,
The lower-stage support 44 moves sideways together with the concrete retaining wall 14 while maintaining the state of being in close contact with the substrate 32 without tilting, and the protective cap 3 fixed to the lower-stage support 44.
While maintaining the watertightness of 6, the leakage of the lubricant such as oil stored in the reservoir hole 36 of the substrate 32 can be prevented.

Further, the concrete retaining wall 14 moves so as to vertically separate from the bedrock 12, and a load is applied to the upper end side in the longitudinal direction of the head portion 16 of the anchor bolt, so that the support portion 22 and the elastic body 66 are provided. When a tensile stress or a compressive stress is applied to the head portion 16 via the metal spacer 68, the fixing nut 26, etc., the tensile stress is generated by the elastic force of the metal spacer 68 and the elastic body 66 with which the metal spacer 68 is in pressure contact. It is possible to prevent the tensile stress and the compressive stress from being dispersedly absorbed and attenuated while the elastic body 66 is uniformly compressed, and to break and crack on the base portion 100 side of the head portion 16 while receiving the compressive stress. At this time, the elastic body 66 and the movable support body 40
The elastic body 6 is not subjected to excessive stress on a part of
6. It is possible to prevent breakage deterioration of the movable support 40 and the like.

Therefore, even if the concrete retaining wall moves with respect to the bedrock due to crustal movement, the head portion 16 of the anchor bolt
The concrete retaining wall can be stably maintained for a long period of time without breakage or cracking on the base 100 side. Further, the fixing state of the concrete retaining wall 14 to the bedrock 12 can be maintained by tightening the fixing nut, which is loose, while removing the protective cap 72 and inspecting it periodically. Also,
The anchor bolt device 10 for fixing the retaining wall does not use a large spherical washer or the like, has a simple structure and is formed in a small size to enhance the safety during the construction of the concrete retaining wall, the manufacturing cost is low, and the construction cost is low. Can also save.

[0035]

As described above, according to the anchor bolt device for fixing a retaining wall according to the first aspect of the present invention, the concrete retaining wall of the concrete is passed through the concrete retaining wall placed on the bedrock and driven into the bedrock. Anchor bolts with the head portion protruding to the outer surface side, a support portion installed around the head portion on the outer surface of the concrete retaining wall, and a stress applied to the head portion mounted on the support portion An elastic shock absorbing portion that absorbs elastically, a fixing nut that is screwed to the upper end side of the head portion, and is pressed into contact with the upper surface side of the elastic shock absorbing portion.
The supporting portion is on the lower surface side of the elastic shock absorbing portion, the head portion is penetrated, and the movable supporting member having a spherical surface portion on the lower surface side is slidably adhered to the spherical surface portion. And a substantially cylindrical lower stage support body having a concave upper surface for supporting the movable support body in a freely tiltable manner, thereby providing a head portion projecting from a concrete retaining wall due to crustal movement or the like. , The shear stress applied in the direction intersecting with the head part is broken by the support part, and the tensile and compressive stress applied in the longitudinal direction of the head part is averaged and dispersed in the elastic shock absorbing part while being broken at the base side of the head part. It can prevent the occurrence of cracks and cracks and can maintain the useful life of the concrete retaining wall for a long time. The device itself can be Durability can be maintained for a long time. Especially,
The spherical portion of the movable support is slidably and closely arranged on the spherical receiving portion of the lower support, and the elastic shock absorbing portion is supported on the upper surface of the movable support to fasten the fixed nut. The horizontal support exerts a horizontal force on the rock surface, and the movable support freely inclines in the direction in which the head flexes, while directly absorbing this horizontal impact force and supporting the elastic shock absorber to absorb the elastic shock. The durability of the device itself can be maintained without applying excessive stress to a part of the portion.

According to a second aspect of the present invention, the concrete retaining wall is laid with a substrate that surrounds the head portion and supports the lower surface of the lower support, and the concrete is provided on the lower surface side of the substrate. By providing an adhesive sealing material that is fixed to the retaining wall, the support and elastic shock absorbers are stably installed on the concrete retaining wall, and the shear stress applied to the head in the cross direction and the upper end in the longitudinal direction of the head. It is possible to effectively disperse and absorb tensile stress and compressive stress applied to the side. In addition, the water tightness between the substrate and the concrete retaining wall is high, and the lubricant such as the filled oil does not leak to the outside from the joint surface between the concrete retaining wall and the substrate, so that the lubricity of each member can be maintained for a long time. Also, regular maintenance inspections and adjustments become easy.

According to a third aspect of the present invention, the elastic shock absorbing portion is provided with an elastic body supported by the movable support body and inserted into the head portion of the anchor bolt. Since the metal spacer provided on the lower surface side of the fixing nut is pressure-contacted, the tensile stress and the compressive stress applied in the longitudinal direction of the head portion are uniformly dispersed and absorbed by the elastic body and the metal spacer pressed against the elastic body. As a result, it is possible to prevent breakage and cracks from occurring on the base side of the head portion, and at the same time, to prevent breakage deterioration of the elastic body without applying excessive stress to a part of the elastic body. Further, the elastic force of the elastic body with which the metal spacers are evenly pressed can be applied to the substrate to improve the water tightness between the substrate and the concrete retaining wall.

According to the fourth aspect of the present invention, the lower surface support member is provided with a plurality of lubricant flow-down grooves in the spherical surface receiving portion, so that oil or the like is transferred from the upper surface side of the support member to the substrate side. Lubricant is stored by flowing down, and lubrication of the spherical surface portion of the movable support with respect to the spherical surface receiving portion of the lower stage supporting portion by utilizing the flow-down groove,
Lubrication of the fixing nut to the head can be maintained for a long time.

According to a fifth aspect of the present invention, the lower support is screwed and fixed with a protective cap for protecting the head portion of the anchor bolt, the fixing nut, the elastic body and the like while covering the lower support. By doing so, the head part, the fixing nut screwed to the head part, the elastic body, the support part, etc. are not contaminated with dust, and the deterioration of the lubricant such as oil filled in the protective cap is prevented. However, each member inside can be lubricated to prevent corrosion and deterioration of each member. In addition, the protective cap can be easily removed from the support to easily perform maintenance and inspection of each internal member.

[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 front view of an anchor bolt device for fixing a retaining wall.

3 is a partially cutaway sectional view taken along the line AA of FIG.

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

FIG. 5 is a vertical cross-sectional view of a retaining wall fixing anchor bolt device showing a state in which the head portion of the anchor bolt is inclined.

FIG. 6 is a perspective view showing an anchor bolt device for fixing a retaining wall provided on a concrete retaining wall cast in place on 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 Part 18 Anchor Bolt 20 Outer Surface of Concrete Retaining Wall 22 Support Part 24 Elastic Shock Absorbing Part 26 Fixing Nut 32 Substrate 34 Adhesive Sealing Material 36 Lubricant Reservoir Hole 38 Spherical Part 40 Movable Supporting Body 42 spherical surface receiving portion 44 lower support 48 lubricant flow-down groove 66 elastic body 68 metal spacer 72 protective cap

Claims (5)

(57) [Claims] 1. An anchor bolt having a head portion projecting to the outer surface side of the concrete retaining wall, which penetrates through the concrete retaining wall cast into the rock material, and an anchor bolt, the head being provided on the outer surface of the concrete retaining wall. A supporting portion that is installed around the portion, an elastic shock absorbing portion that is mounted on the supporting portion and that elastically absorbs the stress applied to the head portion, and is screwed onto the upper end side of the head portion, A fixing nut that is pressed against the upper surface side of the elastic shock absorbing portion, and the supporting portion is a lower surface side of the elastic shock absorbing portion,
The head portion is penetrated, and a movable support body having a spherical surface portion on the lower surface side and a spherical support portion for freely tiltingly supporting the movable support body while slidably contacting the spherical surface portion are provided on the upper surface. An anchor bolt device for fixing a retaining wall, comprising: a substantially cylindrical lower support. 2. The concrete retaining wall is provided with a substrate that surrounds the head portion and supports the lower surface of the lower support, and the lower surface side of the substrate has an adhesive property fixed to the concrete retaining wall. The anchor bolt device for fixing a retaining wall according to claim 1, wherein a sealing material is provided. 3. The elastic shock absorbing portion includes an elastic body supported by the movable support body and inserted through a head portion of an anchor bolt, the elastic body having an upper surface on a lower surface side of the fixing nut. The anchor bolt device for fixing a retaining wall according to claim 1 or 2, wherein the provided metal spacer is pressure-welded. 4. The anchor bolt device for fixing a retaining wall according to claim 1, wherein a plurality of lubricant flow-down grooves are provided in the spherical surface receiving portion of the lower support. 5. The lower support is screwed and fixed to a protective cap for protecting the head portion of the anchor bolt, a fixing nut, an elastic body and the like while covering the lower support body. An anchor bolt device for fixing the retaining wall according to any one of the above.