JP3028469B2 - 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 an anchor bolt device for 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. As an anchor-bolt device for driving into such a concrete retaining wall, the applicant has applied an anchor-bolt device Z as shown in FIG.
297801. As shown in the drawing, this anchor-bolt device Z drives an anchor bolt X into a concrete retaining wall Y at a required interval, and a head portion W of the anchor bolt X protruding from the concrete retaining wall Y.
Is provided with a support portion V on the retaining wall Y surface, and a fastening nut U is screwed into a head portion W projecting upward from the support portion V to fix the support portion V. An elastic member T such as a rubber body is provided between the support portion V and the fastening nut U.
Is provided to elastically absorb the load applied to the head portion W from the retaining wall surface due to crustal deformation or the like.

[0003]

However, the concrete retaining wall Y using the conventional anchor bolt device Z described above.
In the winter and cold regions, the concrete retaining wall Y
When the frost column O generated between the lower surface side of the rock and the upper surface side of the rock S pushes the retaining wall Y surface greatly above the rock S,
The nut-shaped elastic member T is compressed and expands in the radial direction as shown in the figure, so that a large tensile force acts on the surface of the elastic member T, which may cause a tear or a crack. Also, due to a change in the load applied to the head portion W,
The compression and tension of the elastic member T inside the apparatus Z are repeated and repeated, and the elastic member T is easily deteriorated and easily fatigued, so that there is a problem that a smooth shock absorbing function cannot be performed.

[0004] The present invention has been made in view of the above-mentioned conventional problems, and has as its object the purpose of the present invention not to be torn even by large vertical movements due to ground fluctuations or cold weather, and not to be easily deteriorated. An object of the present invention is to provide a retaining wall fixing anchor bolt device capable of retaining a high-strength, high-withstand-pressure, and high-durability elastic shock absorbing function.

[0005]

In order to achieve the above object, the present invention relates to a concrete retaining wall 1 cast on a rock mass 12.
4 and an anchor bolt 18 which is driven into the rock 12 and has a head portion 16 protruding toward the outer surface 20 of the concrete retaining wall 14, and an outer surface 20 of the concrete retaining wall 14.
Support portion 22 installed around the head portion 16
An elastic shock absorbing portion 24 mounted on the support portion 22 and elastically absorbing the stress applied to the head portion 16; and an elastic shock absorbing portion 24 screwed to the upper end side of the head portion 16 and A fixing nut 26 pressed against the upper surface, wherein the elastic shock absorbing portion 26 alternately laminates a flat plate-like elastic body 56 and a spacer plate 58 capable of deforming to some extent. An anchor bolt device 10 for fixing a retaining wall is provided.

The elastic body 56 and the spacer plate 58
May be joined and fixed to each other.

The joint between the flat elastic body 56 and the spacer plate 58 may be provided with a displacement prevention mechanism 62 for preventing displacement of the joining position.

Further, the displacement prevention mechanism 62 may include a concave groove 68 formed on the front surface 64 and / or the rear surface 66 of the spacer plate 58.

Further, the concave groove 68 may be a concentric stripe-shaped concave groove.

Further, the elastic body 56 may be made of a rubber member.

The elastic shock absorbing portion 24 is formed in the shape of a donut-shaped air-core disk penetrating the center of the head portion 16 of the anchor bolt 18, and includes the elastic body 56 and the spacer plate 58. May be formed in an air-core disc shape, respectively.

The support portion 22 is a movable support member 40 on the lower surface side of the elastic shock absorbing portion 24, through which the head portion 16 is penetrated, and having a spherical portion 38 on the lower surface side, The movable support 4
And a substantially cylindrical lower support body 44 having a spherical receiving portion 42 that supports the O freely tilted on the upper surface thereof.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An anchor bolt device for fixing a retaining wall according to the present invention is driven into a rock through a concrete retaining wall cast on the rock, and a head portion protrudes to the outer surface side of the concrete retaining wall. An anchor bolt, a support portion provided around the head portion on the outer surface of the concrete retaining wall, and an elastic impact mounted on the support portion and elastically absorbing the stress applied to the head portion. An absorbing portion, and a fixing nut screwed to an upper end side of the head portion and pressed against an upper surface side of the elastic shock absorbing portion, wherein the elastic shock absorbing portion can undergo some elastic deformation. It is configured by alternately laminating flat elastic bodies and spacer plates. The elastic shock absorbing part as a whole absorbs external shocks while the spacer plate reinforces the pressure resistance load strength of the whole elastic shock absorbing part to prevent the elastic body from becoming a kind of buckling state. In addition, the strength of the entire elastic shock absorbing portion is increased to improve the bearing strength. The elastic shock absorbing portion may include an insertion hole through which the head portion of the anchor bolt can be inserted.

Further, the elastic body and the spacer plate may be joined and fixed to each other. Elastic body and space
Ensures an integral joining force with the plate, and absorbs shock while maintaining high strength against loads in the thrust direction. Also,
The member is prevented from being damaged by elastic deformation exceeding the limit of the elastic body.

Further, the flat elastic body and the space
The joints of the sub-plates may be provided with a displacement prevention mechanism for preventing displacement of the joining positions. The misalignment prevention mechanism may be provided with uneven portions on the plate surfaces of the elastic body and the spacer plate, and the uneven portions may be fitted when the elastic body and the spacer plate are joined.

Further, the displacement prevention mechanism may comprise a concave groove formed on a front surface and / or a back surface of the spacer plate. The concave groove may be formed in any shape and structure such as a linear shape and a dot shape. Further, the displacement prevention mechanism may be formed by a ridge formed on the front surface and / or the back surface of the spacer plate.

Further, the concave groove may be a concentric streak-shaped concave groove. The shape of the groove, the width,
The depth and the like may be set in accordance with the material of the elastic body, thereby realizing reliable prevention of displacement.

Further, the elastic body may be made of a rubber member. As the rubber member, any material may be selected as a material such as hardness, elasticity, and heat resistance.

The elastic shock absorbing portion is formed in the shape of a donut-shaped air-core disk penetrating the center of the head portion of the anchor bolt, and the elastic body and the spacer plate are each formed of an air-core circle. It may be formed in a plate shape.
The elastic shock absorber easily determines the mounting position and improves the operation of mounting the device on the anchor bolt. The elastic shock absorbing portion may have any shape as long as it can be attached to the head portion of the anchor bolt.

Further, the support portion is a lower surface side of the elastic shock absorbing portion, the head portion is penetrated, and a movable support having a spherical portion on a lower surface side is slidably contacted with the spherical portion. And a lower support having a substantially cylindrical shape in which a spherical receiving portion that supports the movable support so as to tilt freely while moving the lower support is formed on the upper surface. The horizontal force is applied to the rock surface and the movable support is freely tilted in the direction in which the head bends, absorbing the horizontal impact force directly while supporting the elastic shock absorbing part. The durability of the device itself is maintained without excessive stress being applied to a part of the shock absorbing portion.

[0021]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1, 2, and 4 show an anchor bolt device (hereinafter, referred to as an "anchor bolt device") 10 for fixing a retaining wall according to an embodiment of the present invention. As is apparent from the figure, the anchor bolt device 10 penetrates a reinforced concrete retaining wall
An anchor bolt 18 that is driven into the outer surface of the concrete retaining wall 14 to project the head portion 16, a support portion 22 that is installed on the outer surface 20 of the concrete retaining wall 14 and surrounds the head portion 16, An elastic shock absorbing portion 24 mounted on the portion 22 for elastically absorbing the stress applied to the head portion 16 and screwed to an upper end side of the head portion 16 to press against the upper surface side of the elastic shock absorbing portion 24; Fixed nut 26.

In FIG. 1, the anchor bolt 18 that has been driven into the rock 12 through the concrete retaining wall 14 has a length of about 3 m to about 10 to 20 m.
This is driven into the retaining wall 14. A male screw 30 is engraved on the upper end of the anchor bolt 18. The head portion 16 of the anchor bolt 18 on which the male screw 30 is engraved is provided so as to protrude from the outer surface 20 of the concrete retaining wall 14.

On the outer surface 20 of the concrete retaining wall 14, a substrate 32 surrounding the head portion 16 and stably supporting the lower surface of the support portion 22 is laid. The substrate 32
It is fixed to the concrete retaining wall 14 by an adhesive sealing material 34 provided on the lower surface side. In the present embodiment, the substrate 32 is formed in a substantially rectangular flat plate using a corrosion-resistant metal, for example, an aluminum alloy as a material, and a lubricant reservoir such as oil for lubricating the anchor bolts 18 and the support portions 22 at the center thereof. A hole 36 is opened. 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.

Thus, the worker can attach the adhesive sealing material 3 on the lower surface of the substrate 32 at the position of each head 16 of the concrete retaining wall 14 which is cast on the rock 12 having a steep slope.
4 is peeled off, and the substrate 32 is placed on the outer surface 20 of the concrete retaining wall 14 so as to surround the head portion 16.
Can be easily fixed. Since the adhesive sealing material 34 is excellent in flexibility and tackiness, even if the outer surface 20 of the concrete retaining wall 14 is a concave and convex concave surface, the adhesive between the substrate 32 and the concrete retaining wall 14 is formed while adhering accordingly. The watertightness of the joint surface can be maintained, and the lubricant such as oil stored in the lubricant reservoir 36 of the substrate 32 does not leak to the outside, and the lubricity of each member can be maintained for a long period of time. Also, the substrate is
Regardless of the present embodiment, it may be formed in a circular plate, a polygonal plate such as a hexagon, or the like.

The support portion 22 is mounted on the upper surface of the substrate 32. In FIGS. 1 and 2, the support portion 22 is a lower surface side of an elastic shock absorbing portion described later, the head portion 16 is penetrated, and a movable support body 40 having a spherical portion 38 on the lower surface side;
A substantially cylindrical lower support 44 having a spherical receiving portion 42 provided on the upper surface thereof for supporting the movable support 40 so as to be able to tilt freely while sliding the spherical portion 38 in close contact is provided.

As shown in FIG. 2, the lower support 44 is provided with a flat portion 45 along the upper edge of the spherical receiving portion 42 recessed on the upper surface thereof. A substantially frustum-shaped hole 46 is opened toward the lower surface of the lower support 44. A plurality of lubricant flow-down grooves 48 are formed in the spherical receiving portion 42 from the upper edge side toward the hole 46, and the lower end side of the hole 46 is formed with a lubricant reservoir hole 36 as shown in FIG. A circumferential step portion 50 that is engaged with the peripheral surface is vertically provided.

As a result, the lower support is engaged with the lubricant reservoir hole on the lower surface of the lower support to prevent the lower support from being displaced from the substrate, so that the mounting of the substrate and the lower support during the assembly of the apparatus is easy. The assembly work can be performed in a short time. Further, in this embodiment, the lower support 44 is provided with an external thread 57 screwed with a female screw of a protective cap described later on the outer peripheral surface of the upper end of the lower support 44.

The spherical receiving portion 42 of the lower supporting body 44
The movable support 40 is supported on the upper surface of the. In this embodiment, the movable support 40 is formed of a substantially hemispherical solid body or a substantially half-moon-shaped solid body. As shown in FIG. 1, a bolt hole 52 is formed to penetrate the head 16 from a substantially central position on the upper surface of the substantially hemispherical movable support 40 to a central position of the spherical portion 38 on the lower surface. This bolt hole 5
2 through the head 16 and the lower support 44
The spherical portion 38 of the movable support 40 is slidably supported in close contact with the spherical receiving portion 42.

Accordingly, the movable support 40 is supported to be freely inclined with respect to the lower support 44, and when a load is applied to the head 16 from the cross direction and the upper end of the head 16 bends laterally, The movable support 40 disperses and absorbs the shear stress applied to the head 16 protruding from the concrete retaining wall 14 while tilting in the same direction as the lateral deflection of the head 16 in the spherical receiving portion 42 of the lower support 44. The head portion 16 can be prevented from being broken or cracked.

As shown in FIGS. 1 and 2, an elastic shock absorbing portion 24 for elastically absorbing the stress applied to the head portion 16 is provided on the upper surface side of the support portion 22. One characteristic configuration of the present invention is that the elastic shock absorbing portion 24 includes a flat elastic body 56 capable of elastic deformation to some extent and a spacer plate 5.
8 are alternately laminated.

In FIG. 2, the elastic shock absorbing portion 24 is formed in a substantially columnar shape, and penetrates the upper and lower sides of the substantially central portion of the column and has an insertion hole 60 through which the head portion 16 can be inserted. Is provided. That is, the elastic shock absorbing portion 24 is formed in a cylindrical donut-shaped air-core disk shape having a certain thickness in the height direction penetrated through the center of the head portion 16 of the anchor bolt 18. The thickness of the board forming the elastic shock absorbing portion may be arbitrarily set, and its shape may be formed in a substantially rectangular shape in plan view, or a polygon such as a triangle, a pentagon, or a hexagon.

As described above, since the elastic shock absorbing portion is provided with the hollow portion such as the insertion hole, the elastic shock absorbing portion can be easily mounted by simply inserting the hollow portion into the anchor bolt, and the anchor can be easily mounted. The position of attachment to the bolt can be easily determined, and the time for attaching the device to the anchor bolt can be shortened.

As shown in FIG. 1, the substantially cylindrical elastic shock absorbing portion 24 has five elastic members 56a, 56b,. . . 56e
And five spacer plates 58a, 58b,. . . 58e. The elastic shock absorbing portion 24 is
0 from the upper surface side of the elastic body 56a, the spacer plate 58a, the elastic body 56b. . . Are alternately and in close contact with the plate surface and the plate surface, and are laminated, and are integrally formed by pressing from above with a fixing nut to be described later. In this embodiment, the elastic body 56
Is formed of a disc-shaped rubber member, and a communication hole 61 is opened at a substantially central portion thereof. The spacer plate 58 is formed of a disc-shaped metal plate made of, for example, an aluminum alloy, and a communication hole 63 is opened at a substantially central portion thereof. That is, the elastic body 56 and the spacer plate 58 are each formed in an air-core disk shape.

Regardless of the present embodiment, the number of elastic bodies and spacer plates forming the elastic shock absorbing portion may be set arbitrarily, and their lamination pattern may be set arbitrarily. In short, it is only necessary to have a plurality of structures in which the elastic body is sandwiched between spacer plates made of metal or the like. The elastic body made of a rubber member may have its elasticity, hardness, size, etc. arbitrarily set. The spacer plate may be a metal plate, a hard synthetic resin plate, a ceramic plate, a wooden plate, or the like, or a plate that is not easily deformed even when a load is applied. It is suitable.

In the embodiment, the elastic body 56 and the spacer plate 58 have their respective plate surfaces joined and fixed to each other by an adhesive capable of adhering a metal (not shown) and a rubber member. . Regardless of the present embodiment, the adhesive is
A synthetic resin type or an acrylic adhesive capable of bonding and fixing a metal and a rubber member may be used as long as the elastic body and the spacer plate can be bonded and fixed. In this way, the elastic body and the spacer plate are joined and fixed with an adhesive or the like so that the entire elastic shock absorbing portion is integrally fixed, and its high withstand pressure and reliable elastic absorbing power are ensured. Become.

The elastic shock absorbing portion 24 first receives an upward force from the movable support member 40 and elastically deforms the elastic body 56a, while absorbing this force to some extent, and applies an upward force to the spacer plate 58a. Since the spacer plate 58a is rigid and does not deform, the force is directly transmitted to the elastic body 56b. Then, the upward force from the movable support 40 is sequentially elastically absorbed by the entire elastic shock absorbing portion 24. As described above, the elastic shock absorbing portion is configured such that each spacer plate is a rigid body, and the elastic body is sandwiched inside while maintaining the shape of the spacer plate. The strength of the entire absorbing portion is ensured, and the elastic portion is prevented from becoming a kind of buckling state, and the strength of the entire elastic shock absorbing portion is maintained for a long time. Furthermore, since the elastic body is divided into several sections by the spacer plate, the force applied to the entire elastic shock absorbing section is dispersed and absorbed by a plurality of elastic bodies. The load of the force applied to each body is reduced, and the pressure resistance load limit of the entire elastic shock absorber is increased.

Another feature of the present invention is that the joint between the flat elastic body 56 and the spacer plate 58 is provided with a displacement prevention mechanism for preventing the displacement of the joining position. is there.

As shown in FIG. 3, the surface 6 of the spacer plate 58
The misalignment prevention mechanism 62 is provided on the side 4 and the back side 66. The misalignment prevention mechanism 62 includes a groove 68 formed on the front surface 64 and the back surface 66 of the spacer plate 58. In FIG. 3, the concave groove 68 is formed as a plurality of concentric streak-shaped grooves centered on a substantially central point of the air-core disk-shaped spacer plate 58. At the same time, convex portions 70 adjacent to the concave grooves 68 are formed on the front surface 64 side and the rear surface 66 side of the spacer plate 58. Recessed groove 68 of spacer plate 58
1 prevents the lateral displacement of the elastic body 56 by engaging the elastic body 56 shown in FIG. 1 in which the side wall surface in the concave groove 68 bites into the groove by the elastic deformation and is deformed into a convex shape. .

Regardless of the embodiment, the concave groove may be formed in any shape such as an intermittent arc, triangle, polygon or the like, and may be formed of the same elastic body so as to prevent displacement due to a load in the thrust direction. It is preferable to form it into a shape that engages with.
Further, such a displacement prevention mechanism may form a concave groove on either the front surface or the back surface of the spacer plate. As described above, by forming the groove in the spacer plate, the misalignment prevention mechanism can be easily manufactured, the cost for it can be reduced, and mass production can be realized.

As shown in FIG. 1, the elastic shock absorbing portion 24 having a structure in which the plurality of elastic bodies 56 and the spacer plates 58 are alternately laminated as described above is used for the head portion 16 of the anchor bolt 18. It is placed on the upper surface of the movable support 40 while being inserted into the insertion hole 60. In FIG.
Numeral 6 protrudes from the upper surface of the uppermost spacer plate 58 of the elastic shock absorbing portion 24. A fixing nut 26 is screwed into the projecting portion of the head portion 16 to press the spacer plate 58 into pressure contact. Have been.

For example, the load applied to the head portion from the retaining wall displaced in the vertical direction by the frost column between the concrete retaining wall and the bedrock generated in winter or cold regions is elastically elastically elastically. The elastic shock absorbing part is provided by laminating the elastic body and the spacer plate, so that the entire elastic shock absorbing part elastically absorbs the external shock while the elastic shock absorbing part is provided by the spacer plate. Since the entire compressive load strength is reinforced, the elastic body is prevented from becoming a kind of buckling state, and the strength of the entire elastic shock absorbing portion is increased to improve the bearing strength.

Further, even when a force in a direction substantially parallel to the rock surface is applied to the head, the movable support directly absorbs the impact in the parallel direction while the movable support is freely inclined in the direction in which the head is bent. Since the elastic shock absorbing portion is supported, no excessive stress is applied to a part of the elastic shock absorbing portion, and the durability of the device itself is maintained.

Further, in the present embodiment, as shown in FIGS. 1 and 2, the lower support 44 covers and protects the head portion 16, the fixing nut 26, the elastic shock absorbing portion 24 and the like of the anchor bolt 18. Is screwed and fixed. The protective cap 72 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 side of the open end of the protective cap 72, a female screw 74 screwed with the male screw 57 of the lower support body 44 is engraved. At the top of the head, a lubricant injection hole (not shown) is provided with a stopper plug 78 such as a bolt. The hole is opened so that it can be fastened.

The protective cap 72 is screwed and fixed to the lower support 44, and a lubricant such as oil (not shown) is injected through the injection hole of the protective cap 72. The injected oil flows down to the upper surface of the support portion 22 and flows down the lubricant flow-down groove 48 provided in the spherical receiving portion 42 of the lower support body 44 to form the hole 4.
6 is stored in the pool hole 36 of the substrate 32 to lubricate the head portion 16, the fixing nut 26, the elastic shock absorbing portion 24 and the like in the protective cap 72, and prevent deterioration of each member due to contamination, rust, etc. it can. Further, the protective cap 72 is easily removed from the lower support body 44 to remove the internal head portion 1.
6, maintenance of fixing nut 24, elastic shock absorbing part 24, etc.
Inspection can be easily performed.

Next, the anchor bolt device 1 according to the present invention.
The operation of 0 will be described. As shown in FIG. 1, the anchor bolt device 10 is installed on a head portion 16 of an anchor bolt 18 protruding from an outer surface 20 of a concrete retaining wall 14.

In this state, the anchor-bolt device 10
For example, when a force such as a frost column (not shown) generated between the concrete retaining wall 14 and the bedrock 12 in the winter season applies a force to lift the bed from the bedrock 12, the force pushes the support portion 22 upward as shown in FIG. Then, the entire elastic shock absorbing portion 24 between the support portion 22 and the fixing nut 26 is compressed in the longitudinal direction of the elastic shock absorbing portion 24 shown by arrows (a) and (b).

In FIG. 4, a force is applied to the elastic shock absorbing portion 24 in the direction of the arrow (b) from the upper surface of the movable support 44, and this force is applied to the elastic body 56a, the spacer plate 58a, the elastic body 56b, Spacer plate 58b. . . Will tell you sequentially. At this time, the forces applied to the elastic bodies 56 are elastically dispersed and absorbed, and the elastic shock absorber 24 as a whole absorbs these forces. The elastic shock absorbing part prevents the elastic body from becoming a kind of buckling state by reinforcing the pressure resistance of the entire elastic shock absorbing part by the spacer plate, so that the elastic shock absorbing part has strength and supporting strength. Will be improved. As described above, the anchor bolt device can be used for a long time without breaking even if the load from the concrete retaining wall is repeatedly changed by the frost column or the crustal deformation by increasing the strength and the bearing strength of the elastic shock absorbing portion. It can be used.

The present invention is not limited to the configuration of the embodiment described above, and may be modified as desired without departing from the essence of the invention described in the appended claims.

[0049]

As described above, according to the anchor bolt device for retaining wall fixing of the present invention, it is driven into the rock through the concrete retaining wall installed in the rock, and the outer side of the concrete retaining wall. An anchor bolt having a head protruding therefrom; a support provided around the head on the outer surface of the concrete retaining wall; and a stress placed on the support and applied to the head elastically. An elastic shock absorbing portion that absorbs, and a fixing nut screwed to the upper end side of the head portion and pressed against the upper surface side of the elastic shock absorbing portion,
The elastic shock absorbing portion is formed by alternately stacking a flat elastic body and a spacer plate that can be elastically deformed to some extent. The load applied to the head from the retaining wall displaced in the vertical direction by the frost column between the retaining wall and the bedrock is elastically absorbed by the elastic body, and the elastic shock absorber is formed by the elastic body and the spacer plate. The elastic body absorbs external shocks and the spacer plate reinforces the pressure resistance of the entire elastic shock absorbing part. , The strength of the entire elastic shock absorbing portion can be increased, and the bearing strength can be improved.

Further, since the elastic body and the spacer plate are joined and fixed to each other, the whole elastic shock absorbing portion is integrally fixed. As a whole, shock absorption is performed as a whole, and high pressure resistance and reliable elasticity can be secured.

The flat elastic body and the space
The joint of the support plate is provided with a misalignment prevention mechanism to prevent misalignment of the joints, so that the jointing force between the elastic body and the spacer plate is ensured and the load in the thrust direction is reduced. However, it is possible to absorb impact while maintaining high strength. Further, damage or deterioration of the member due to elastic deformation exceeding the limit of the elastic body can be prevented, and the strength of the device can be maintained for a long period of time.

Further, the misalignment preventing mechanism comprises a groove formed on the front surface and / or the back surface of the spacer plate, and can be easily misaligned by forming a circular groove, for example. The implementation of prevention can be seen, and it is easy to manufacture and can be manufactured in large quantities at once and at low cost.

Further, since the concave groove is a concentric streak-shaped concave groove, it is possible to secure the easiness of production, so that the production cost can be reduced and mass production is possible.

Further, since the elastic body is made of a rubber member, the material is inexpensive, easily available in large quantities, and the manufacturing cost of the apparatus itself can be kept low, so that an inexpensive apparatus can be provided. it can.

The elastic shock absorbing portion is formed in the shape of a donut-shaped air-core disk penetrating the center of the head portion of the anchor bolt, and the elastic body and the spacer plate are each formed of an air-core disk. Since the elastic shock absorbing portion is formed in a plate shape, the elastic shock absorbing portion can be attached to the anchor bolt simply by inserting the hollow core portion of the elastic shock absorbing portion into the anchor bolt. It can be easily attached and assembled, and the work of attaching the anchor bolt device to the concrete retaining wall on site can be completed in a short time. In addition, the mounting position can be easily determined, and the operation of mounting the device on the anchor bolt is good.

Further, the supporting portion is a lower surface side of the elastic shock absorbing portion, the head portion is penetrated, and a movable support having a spherical portion on the lower surface side is slidably contacted with the movable supporting member. And a substantially cylindrical lower support having a concave spherical surface receiving portion on the upper surface for supporting the movable support while allowing the movable support to tilt freely, whereby a horizontal force is applied to the rock surface at the head portion. In addition to absorbing the horizontal impact force directly while the movable support is freely inclined in the direction in which the head part bends, excessive stress is applied to a part of the elastic shock absorber by supporting the elastic shock absorber. Without this, the durability of the device itself can be maintained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic explanatory view of a retaining wall fixing anchor bolt device according to an embodiment of the present invention.

FIG. 2 is an exploded schematic explanatory view of a main part of the anchor bolt device for fixing the retaining wall.

FIG. 3 is an enlarged explanatory view of a main part of an elastic shock absorbing portion of the anchor bolt device for fixing the retaining wall.

FIG. 4 is an explanatory view of a longitudinal section action of the anchor bolt device for fixing the retaining wall.

FIG. 5 is a longitudinal sectional view of a conventional retaining bolt fixing anchor bolt device.

[Explanation of symbols]

 10 Anchor bolt device for retaining wall fixing. DESCRIPTION OF SYMBOLS 12 Rock 14 Concrete retaining wall 16 Head part 18 Anchor bolt 20 Outer surface 22 Support part 24 Elastic shock absorbing part 26 Fixing nut 38 Spherical part 40 Movable support 42 Spherical receiving part 44 Lower support 56 Elastic body 58 Spacer plate 62 Misalignment Prevention mechanism 64 Front surface 66 Back surface 68 Groove 72 Protective cap

Claims (8)

(57) [Claims] 1. An anchor bolt which is driven into a bedrock through a concrete retaining wall cast on the bedrock, and has a head portion projected to an outer surface side of the concrete retaining wall; A support portion surrounding the portion, an elastic shock absorbing portion mounted on the support portion and elastically absorbing a stress applied to the head portion, and screwed to an upper end side of the head portion; A fixing nut pressed against the upper surface side of the elastic shock absorbing portion, wherein the elastic shock absorbing portion alternates between a flat elastic body capable of performing a certain degree of elastic deformation and a spacer plate. Anchor bolt device for retaining wall fixing, which is laminated and provided. 2. The anchor bolt device according to claim 1, wherein the elastic body and the spacer plate are joined and fixed to each other. 3. The retaining wall according to claim 1, wherein a displacement preventing mechanism for preventing displacement of the joining position is provided at a joint between the flat elastic body and the spacer plate. Anchor bolt device for fixing. 4. The anchor bolt device for retaining wall fixing according to claim 3, wherein the displacement prevention mechanism comprises a concave groove formed on a front surface and / or a back surface of the spacer plate. 5. The anchor bolt device for retaining wall fixing according to claim 4, wherein said concave groove is a concentric streak-shaped concave groove. 6. The anchor bolt device according to claim 1, wherein the elastic body is made of a rubber member. 7. The elastic shock absorbing portion is formed in the shape of a donut-shaped air-core disk penetrating the center of the head portion of the anchor bolt, and the elastic body and the spacer plate are each formed of an air-core circle. The anchor bolt device for retaining wall fixing according to any one of claims 1 to 6, wherein the anchor bolt device is formed in a plate shape. 8. The movable support having a spherical portion on the lower surface side, wherein the movable portion has a spherical surface portion on the lower surface side of the elastic shock absorbing portion, and the support portion slides the spherical surface portion in close contact. The retaining wall fixing according to any one of claims 1 to 7, further comprising: a substantially cylindrical lower-stage support body having a spherical receiving portion that is concavely provided on an upper surface and that supports the movable support body so that the movable support body can tilt freely. Anchor bolt device.