JP2628030B2 - 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 road slope to 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, the anchor bolt is driven into the bedrock through the concrete retaining wall from the surface at a required interval, and the upper end of the anchor bolt is projected from the concrete retaining wall. At the position of the part, the substrate, the spherical washer and the receiving plate are installed on the retaining wall as shown in FIG.
A fastening nut is screwed into a projecting portion of the anchor bolt projecting upward from the receiving plate, and is firmly fastened to the receiving plate.

[0003] During the long-term use, the tightening 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 tightening again. In order to maintain water tightness with the nut and prevent the occurrence of corrosion, etc., a protective cap is mounted on the upper surface side of the receiving plate, and the bolt holes provided in the support plate inside the cap are attached to the protruding ends of the anchor bolts. The opening end of the protective cap is tightly attached to the receiving plate. This anchor bolt device separates the concrete wall from the bedrock,
It prevents slipping.

[0004]

However, in the above-mentioned anchor bolt device, the concrete retaining wall is liable to move with respect to the bedrock due to crustal deformation or the like during long-term use, and the projecting side of the anchor bolt is displaced. The tightening nut was loosened, and the tightening portion of the protective cap to the anchor bolt was also loosened, reducing the water tightness inside the protective cap and screwing into the internal anchor bolt and this anchor bolt. Defects such as corrosion of the fastening nuts, making it impossible to periodically adjust the tightening of loosened nuts due to misalignment of the concrete retaining wall and shortening the useful life of the concrete retaining wall. There is. In addition, in the anchor bolt device, a specially manufactured large-sized spherical washer is installed on a concrete retaining wall and the protective cap is fixed to the anchor bolt, so that the manufacturing cost of the spherical washer and the like becomes expensive. There is a problem that the construction cost of the anchor bolt device laid on the retaining wall tends to be relatively expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has the following objects. (1) A fastening nut is fastened directly to a projection of an anchor bolt on a concrete retaining wall surface to thereby provide a protective cap. By engaging the protruding end of the anchor bolt with the absorbing engagement portion provided on the side to absorb distortion and the like on the end side of the anchor bolt, the open end of the protective cap is always brought into close contact with the concrete retaining wall surface so that the inside of the protective cap is Can maintain watertightness. (2) Tightening adjustment of the fastening nut can be performed regularly without corrosion of the anchor bolt and the fastening nut in the cap. (3) An anchor bolt device for retaining wall fixing that can use regulated parts at low cost without using a large spherical washer, etc., has a simple structure, and saves construction cost on concrete retaining wall. To provide.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an anchor bolt 16 penetrating a concrete retaining wall 12 and driven into a bedrock 14.
Is screwed into the projection 18 of the anchor bolt 16 projecting from the concrete retaining wall 12, and the concrete retaining wall 20
Nut 22 and the opening 24 are brought into contact with the concrete retaining wall 20 side, and the protective cap engages with the projection 18 of the anchor bolt 16 and covers the projection 18 of the anchor bolt. 26, and the concrete retaining wall 12 is
Even if the anchor bolt 16 is deformed by sliding away from
From the anchor bolt device 10 for retaining wall fixing, which is provided with an absorbing engagement portion 32 for absorbing the detachment width of the protective cap 26 from the concrete retaining wall surface 20 and keeping the protective cap 26 in close contact with the concrete retaining wall surface 20 at all times. Be composed.

According to the second aspect of the present invention, the absorbing engaging portion 32 is located in the protective cap 26, close to the projecting end of the anchor bolt 16, and is free from the projecting end. And an engaging member fixed to the protective cap 26 and an engaging member fixed to the projecting end side of the anchor bolt 16 and constantly urged to contact the urging reference portion 34. 36, and an urging portion 38 that applies an urging force in a direction in which the engaging member 36 is constantly brought into contact with the urging reference portion 34.

Further, in the invention according to claim 3, the urging reference portion 34 is fixed to the support plate 40 so as to allow the projecting end of the anchor bolt 16 to pass through the protective cap 26 in a loosely fitting manner. It may be composed of

Further, in the invention according to a fourth aspect, the engaging member 36 comprises a spacer plate 44 disposed on the upper surface or the lower surface of the support plate 40 and fixed to the projecting portion 18 of the anchor bolt 16. It may be that.

In the invention according to claim 5, one or a plurality of loose fitting holes 48 are formed in the spacer plate 44, and the urging portion 38 allows the loose fitting holes 48 to be loosely fitted. It comprises a guide bolt 50 which penetrates and is erected and fixed to the support plate 40, and an urging spring 52 which is fitted to the guide bolt 50 and urges the spacer plate 44 in a direction in which it comes into contact with the support plate 40. It may be.

Further, in the invention according to claim 6, the fastening nut 22 may have a spherical portion 54 in contact with the concrete retaining wall 12 side.

Further, in the invention according to claim 7, a substrate 56 is fixed between the concrete retaining wall surface 20 and the protective cap 26, and the spherical portion 54 is disposed on the substrate 56 so as to abut. It may be made.

Further, in the invention according to claim 8, a seal ring 60 for maintaining water tightness in the protective cap 26 is provided around the lower end side opening 24 of the protective cap 26.
May be mounted.

[0014]

In the anchor bolt device for retaining wall fixing according to the first aspect of the present invention, the surface of the rock after excavating the surface soil on the slope on the side of the road is provided on the surface to prevent the rock from collapsing. A concrete retaining wall is formed from cast-in-place concrete, and in order to firmly fix the concrete retaining wall to the bedrock, the concrete retaining wall is installed at a projecting portion of an anchor bolt which is driven into the bedrock from the upper surface side of the concrete retaining wall.

A fastening nut is screwed into a projection of the anchor bolt projecting from the concrete retaining wall, and the fastening nut is firmly fastened to the concrete retaining wall. After applying oil for preventing corrosion to the fastening nut and the protrusion, a protective cap provided with an absorbing engagement portion inside is attached to the protrusion of the anchor bolt in a cover-like shape, and the end of the protrusion is The opening end of the protective cap is brought into tight contact with the concrete retaining wall surface by engaging the absorbing engagement portion on the side of the portion, and the inside of the protective cap is kept airtight.

Thus, even if the concrete retaining wall slides against the rock and the anchor bolt is tilted and deformed, the displacement width of the protective cap from the concrete retaining wall is absorbed by the absorbing engagement portion, and the protective cap is always fixed to the concrete. The watertight state in the protective cap can be maintained for a long period of time because it can be closely held to the retaining wall. Then, the protective cap can be removed regularly and the loosened nut can be easily tightened and adjusted.
The service life of the concrete retaining wall will be improved.
Also, without using large spherical washers etc., regulated parts can be used for tightening nuts, protective caps, absorbing engagement parts, etc., the structure is simple and the manufacturing cost is low, and the concrete retaining wall construction Expenses will also be cheaper.

According to a second aspect of the present invention, the absorbing engagement portion is located within the protective cap, close to the protruding end of the anchor bolt, and free from the protruding end. An engaging member fixed to the projecting end side of the anchor bolt, and an engaging member which is always urged to be in contact with the urging reference portion; and A biasing portion that applies a biasing force in a direction in which the anchoring bolt comes into contact with the biasing reference portion, whereby a protruding portion side of the anchor bolt is displaced, and a fitting angle between the axis of the anchor bolt and the concrete retaining wall surface. Is changed, the engaging member is tilted integrally with the anchor bolt and the biasing member is only tilted and deformed, but the biasing reference portion in the protective cap is not tilted. Therefore, the protective cap can maintain the state where the opening end is in close contact with the concrete retaining wall surface, the watertightness in the protective cap is not reduced, and the anchor bolt and the fastening nut are not corroded.

According to a third aspect of the present invention, the urging reference portion is formed of a support plate fixed so that the protruding end of the anchor bolt penetrates in the protective cap in a loosely fitting manner. Since the urging reference portion only needs to fix the support plate in the protective cap, the structure is simple, the manufacturing is easy, and the maintenance and inspection can be simplified. In addition, the anchor bolt is loosely penetrated through the support plate fixed in the protective cap, so that the support plate does not tilt even if the anchor bolt is tilted and deformed. State can be maintained.

According to a fourth aspect of the present invention, the engaging member comprises a spacer plate disposed on the upper surface or the lower surface of the support plate and fixed to the protrusion of the anchor bolt. The structure itself is simple, manufacturing is easy, maintenance and inspection can be performed satisfactorily, and the urging reference part also consists of a support plate. Is extremely simple and not only is easy to engage, but also the manufacturing cost can be kept low.

According to a fifth aspect of the present invention, one or a plurality of loose fitting holes are drilled in the spacer plate, and the urging portion penetrates the loose fitting holes in a loose fitting manner to form the support plate. And a biasing spring fitted on the guide bolt and biasing the spacer plate in the direction of contact with the support plate, thereby minimizing the structure of the biasing portion. , The structure is simple and the manufacture is easy.

According to a sixth aspect of the present invention, the fastening nut has a spherical portion abutting on the concrete retaining wall side, so that the spherical portion of the fastening nut fastened to the anchor bolt is made of concrete. It can be tightly fastened in close contact with the retaining wall side, and even if the anchor bolt is inclined with respect to the concrete retaining wall, the spherical portion slides and the tightened state can be reliably maintained.

Further, according to the present invention, a substrate is fixed between the concrete retaining wall surface and the protective cap, and the spherical portion is disposed on the substrate so as to be in contact with the substrate. The lower surface periphery of the spherical portion is uniformly joined to the upper surface of the substrate, and the concrete retaining wall can be firmly fixed without causing uneven fastening.

According to the eighth aspect of the present invention, a seal ring for maintaining water tightness in the protective cap is attached to a periphery of the lower end side opening of the protective cap, so that the protective cap has When the lower end side of the protective cap is forcibly joined to the board fixed to the concrete retaining wall by engaging the absorbing engagement part with the anchor bolt, the seal ring is compressed and the oil filled in the protective cap, etc. Does not leak to the outside, or external rainwater does not infiltrate into the protective cap, and the watertightness in the protective cap can be maintained for a long time.

[0024]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an anchor bolt device 10 for a retaining wall according to an embodiment of the present invention.
As is clear from the figure, the anchor bolt device 1 for the retaining wall.
Reference numeral 0 denotes an anchor bolt 16 penetrating the concrete retaining wall 12 and driven into the bedrock 14, and the concrete retaining wall 1
The fastening nut 22 screwed to the projecting portion 18 of the anchor bolt 16 projecting from the second fixing nut 2 and fastened to the concrete retaining wall surface 20 and the opening 24 at the lower end side are brought into contact with the concrete retaining wall surface 20 side, and the anchor Protruding part 1 of bolt 16
8 and a protective cap 26 for covering the protrusion 18 of the anchor bolt 16.

As shown in FIGS. 5 and 6, the bedrock 14 is, for example, a bedrock after excavation of the surface soil on a slope on the side of the road 28. In order to prevent the bedrock 14 from collapsing, the bedrock 14 is formed. The concrete retaining wall 12 is formed into a well shape with cast-in-place concrete on the surface of the concrete. Although the concrete retaining wall 12 has a well shape in the embodiment, the concrete retaining wall 12 is not necessarily limited to the well shape and may be formed into a hollow frame shape such as a polygon such as a circle or a hexagon.

An anchor bolt 16 is driven into the bedrock 14 to firmly fix the concrete retaining wall 12 to the bedrock 14.
At a crossing position of No. 2 or the like, a hole of a desired depth is drilled from the concrete retaining wall surface 20 to the bedrock 14 with a rock drill, and a hardening agent such as cement milk is injected into the hole to fix the anchor bolt 16.
Is inserted and hardened integrally with the concrete retaining wall surface 20 and the bedrock 14.

The anchor bolt 16 has a length of about 3 m to about 10 to 20 m, and a male screw 30 is formed at the upper end of the anchor bolt 16. An appropriate anchor bolt is used depending on the properties of the bedrock 14, and the upper end of the anchor bolt 16 on which the male screw 30 is engraved is connected to the concrete retaining wall surface 20.
The anchor bolt 16 is fixed to the bedrock 14 as a projecting portion 18.

The concrete retaining wall 12 is detached from the bedrock 14 while a fastening nut 22 is screwed into the projecting portion 18 of the anchor bolt 16 and fastened to the concrete retaining wall surface 20.
Prevent sliding. However, during long-term use,
Rainwater infiltrates the bedrock 14 from the side of the concrete retaining wall 12 and the mutual contact surface becomes unstable, and the concrete retaining wall 12 on the surface side and the inside bedrock 14 are displaced in either direction, and the anchor is moved. The projecting portion 18 of the bolt 16 from the concrete retaining wall 20 is inclined or floats. Therefore, the fastening nuts 22 fastened to the projecting portions 18 are periodically tightened and adjusted to adjust the rock mass 14 of the concrete retaining wall 12.
It is necessary to prevent detachment from the rock and maintain the strength of the bedrock 14.

For this purpose, the projection 18 of the anchor bolt 16 and the fastening nut 22 fastened to the projection 18 are protected by a protective cap 26 in a watertight manner. As shown in FIGS. 1 and 2, the protective cap 26 is made of a corrosion-resistant metal, for example, stainless steel, and is formed of a hollow cylindrical body having a closed head and a lower end with a truncated cone. I have. At a substantially intermediate height position in the protective cap 26, even if the concrete retaining wall 12 is slid away from the rock 14 and the anchor bolt 16 is deformed by being engaged with the projecting portion 18, An absorption engaging portion 32 is provided for absorbing the separation width from the concrete retaining wall surface 20 and keeping the protective cap 26 in close contact with the concrete retaining wall surface 20 at all times.

As a result, the concrete retaining wall 12 slides with respect to the bedrock 14 so that the protrusion 18 of the anchor bolt 16 is formed.
Even if is displaced, the end of the opening 24 of the protective cap 26 is always brought into close contact with the concrete retaining wall surface 20 while the absorbing engagement portion 32 absorbs the distortion corresponding to the displacement on the end side of the anchor bolt 16. To maintain the water tightness in the protective cap 26, and to secure the anchor bolt 16 and the tightening nut 22 in the cap.
No corrosion occurs and the tightening nut 22
Can be easily adjusted. Also, the anchor bolt device 10 itself does not use a large spherical washer or the like,
The fastening nut 22, the protective cap 26, the absorbing engagement portion 32, and the like can be manufactured using regulated parts. Since the structure is simple, the manufacturing cost can be reduced.

As shown in FIG. 1 and FIG.
2 is within the protective cap 26 and close to the end of the protrusion 18 of the anchor bolt 16,
8 is fixed to the end of the projection 18 of the anchor bolt 16 which is fixed to the protective cap 26 in a free state, and is always in contact with the end of the projection 18. There is provided an engaging member 36 which is urged and engaged so as to be in contact with the urging member, and an urging portion 38 which applies an urging force in a direction in which the engaging member 36 is constantly brought into contact with the urging reference portion 34.

As a result, even if the projection 18 side of the anchor bolt 16 is displaced and the fitting angle between the axis of the anchor bolt 16 and the concrete retaining wall surface 20 changes, the engaging member 36 is integrated with the anchor bolt 16. And biasing portion 38
Is only tilted and deformed, the biasing reference portion 34 in the protection cap 26 does not tilt, and therefore the protection cap 26
Can maintain the watertightness in the protective cap 26 while keeping the opening end in close contact with the concrete retaining wall surface 20.

In the embodiment, the urging reference portion 34 is installed so as to intersect with the protective cap 26, and the engaging member 36 is disposed on the upper surface side so as to be in urging contact. Without being limited to this embodiment, for example,
The engaging member 36 may be disposed so as to urge against the lower surface of the urging reference portion 34.

In FIG. 1 and FIG.
Is formed from a support plate 40 fixed in the protective cap 26 so as to intersect with the end of the protrusion 18 of the anchor bolt 16, and a hole 42 is formed at a substantially central position of the support plate 40. ing. The end of the projecting portion 18 of the anchor bolt 16 penetrates through the hole 42 from the opening 24 side of the protective cap 26 toward the head in a loose fitting manner.

As a result, the urging reference portion 34 is
0 only needs to be fixed in the protective cap 26,
The structure is simple and easy to manufacture, and maintenance and inspection are also simple. In addition, the support plate 40 fixed in the protection cap 26
On the other hand, the end side of the projecting portion 18 of the anchor bolt 16 is penetrated in a loose fitting manner, and even if the anchor bolt 16 is tilted and deformed,
The displacement movement is absorbed by the urging portion 38 described later, and the support plate 40 can be kept in close contact with the concrete retaining wall surface 20 without tilting the support plate 40.

The engaging member 36 is formed of a spacer plate 44 which is disposed in contact with the upper surface of the support plate 40 and is fixed to the projecting portion 18 of the anchor bolt 16.
The spacer plate 44 has a female screw hole 46 opened at the center thereof, and the female screw hole 46 is screwed and fixed to the male screw 30 of the protrusion 18.

As a result, the structure of the engaging member 36 itself is simple, manufacturing is easy, and maintenance and inspection can be performed satisfactorily.
Further, the support plate 40 of the urging reference portion 34 and the spacer plate 44 of the engaging member 36 synergistically make urging engagement between the plates, so that the urging mechanism becomes extremely simple, and the manufacturing cost is low. Can be maintained.

In the spacer plate 44, four loose fitting holes 48 are formed at radially symmetric positions on the periphery thereof. The urging portion 38 includes four guide bolts 5 erected on the support plate 40 so as to penetrate the four loose fitting holes 48 in a loosely fitting manner.
And a biasing spring 52 fitted to the guide bolt 50 and biasing the spacer plate 44 in a direction in which the spacer plate 44 contacts the support plate.

Thus, the urging portion 38 is formed only by the guide bolt 50 fixed to the support plate 40 and the urging spring 52 fitted to the guide bolt 50, and the urging portion 38 is extremely minimized. It can be formed of constituent members, has a simple structure, and is easy to manufacture.

The guide bolt 50 is provided on the support plate 40.
The guide plate is not limited to the four guide bolts 50 erected on the upper surface of the peripheral portion, but three, two, or one guide bolt may be erected on the upper surface of the peripheral portion of the support plate 40. . In response to this, the urging springs 52 may be fitted to the respective members, and the urging force in the direction of pressing the spacer plate 44 against the support plate 40 may be applied. The spacer plate 44 includes a support plate 4.
0, but is not necessarily limited to the upper surface side. For example, the spacer plate 44 is loosely fitted to a guide bolt that is disposed on the lower surface side of the support plate 40 and hangs down on the lower surface of the support plate 40. Alternatively, the spacer plate 44 may be urged against the lower surface of the support plate 40 by an urging spring fitted to the guide bolt. Also in this case, when the anchor bolt 16 is tilted and deformed, the spacer plate 4
4 tilts on the lower surface side of the support plate 40, and at this time, the support plate 4
0 can hold the protective cap 26 in close contact with the concrete retaining wall surface 20 without tilting. Further, an urging reference portion 34 is provided at a position facing the inner peripheral surface of the protective cap 26,
The engaging member 36 may be urged and supported in an intersecting manner with respect to the opposing urging reference portion 34.

As described above, the absorbing engaging portion 32 has a plate to be pressed or another pressed portion provided in the protective cap 26, and the projecting portion 18 side of the anchor bolt 16 is biased by a spring. Any structure may be used as long as the urging member absorbs the fluctuation width of the retaining wall even if the retaining wall side is substantially vertically moved. Therefore, the configuration of the biasing reference portion and the engaging member is not limited to the configuration of the embodiment, and the biasing reference portion may be simply formed by the protective cap 2.
6, the stay may be fixed to the projection of the anchor bolt 16 and the stay or the like may be constantly pressed against the inner wall surface of the protective cap 26 via an urging member. Further, the engaging member may be transferred to a block or may have any other shape. Further, the urging portion in the absorbing engagement portion may be urged in a direction in which the urging portion is always separated from the urging reference portion so as to absorb the fluctuation on the retaining wall side.

As shown in FIGS. 1 and 2, the anchor bolt 1
The fastening nut 22 screwed into the male screw 30 of the projection 18 of the sixth embodiment
Has a spherical portion 54 in contact with the concrete retaining wall surface 20 at a lower position thereof. As a result, the fastening nut 22 is screwed into the anchor bolt 16 and the concrete retaining wall 2
0, the spherical portion 54 is tightly attached to the concrete retaining wall surface 20 and can be firmly tightened.
Is inclined with respect to the concrete retaining wall 12,
Can reliably maintain the tightened state while sliding.

As shown in FIGS. 1 and 2, the anchor bolt 1
A substrate 56 is fixed to the concrete retaining wall surface 20 to which the six protrusions 18 are fixed, with the protection cap 26 and the fastening nut 22 abutting on the protrusion 18. The substrate 56 is formed of a corrosion-resistant metal plate, for example, a stainless steel plate. The spherical portion 54 of the fastening nut 22 is tightly and tightly fastened to the substrate 56 so that the lower surface periphery of the spherical portion 54 is evenly joined to the smooth upper surface of the substrate 56, without causing uneven fastening. The concrete retaining wall 12 can be firmly fixed to the bedrock 14. A circumferential step 58 whose diameter is reduced toward the inner surface is formed at the periphery of the opening 24 on the lower end side of the protective cap 26, and the circumferential step 58 is used to maintain watertightness in the protective cap 26. Is mounted. The seal ring 60 is an O-ring made of synthetic rubber, synthetic resin, or the like.

Thus, the substrate 56 fixed to the concrete retaining wall surface 20 by engaging the absorbing engagement portion 32 in the protective cap 26 with the end of the projection 18 of the anchor bolt 16.
When the lower end side of the protective cap 26 is forcibly joined, the seal ring 60 is compressed and oil or the like filled in the protective cap 26 leaks to the outside, or external rainwater flows into the protective cap 26. Without infiltrating into
Anchor bolt 16 and fastening nut 22 in protective cap
Corrosion can be prevented for a long time.

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 FIGS. 5 and 6, the anchor bolt device 10 for retaining wall fixing is used for the road 2.
In order to prevent the rock 14 from collapsing, a concrete retaining wall 12 is formed into a well shape or the like with cast-in-place concrete on the surface of the rock 14 after excavation of the surface soil on the side slope of the side of FIG. In order to firmly fix the wall 12 to the bedrock 14, the wall 12 is installed on the projecting portion 18 of the anchor bolt 16 which is driven into the bedrock 14 from the upper surface side of the intersection of the concrete retaining wall 12 formed into a well shape and fixed. .

A base plate 56 is fixed to the concrete retaining wall 20 from which the projecting portion 18 of the anchor bolt 16 is projected, and the fastening nut 22 is screwed into the male screw 30 of the projecting portion 18, and the lower portion of the fastening nut 22. The side spherical portion 54 is brought into close contact with the upper surface of the substrate 56. After applying oil or the like to the fastening nut 22 and the male screw 30 of the protrusion 18, a protective cap 26 having an absorbing engagement portion 32 is attached to the protrusion 18 of the anchor bolt 16 in a cover-like manner. Projection 18
The female screw hole 46 at the center of the spacer plate 44, which is urged against the upper surface of the support plate 40 of the absorbing engagement portion 32, is screwed into the end portion of
The protective cap 26 is rotated so that the seal ring 60 provided on the peripheral edge of the protective cap 26 on the opening 24 side is brought into close contact with the substrate 56 under strong pressure to keep the inside of the protective cap 26 watertight.

The concrete retaining wall 12 is firmly fixed to the rock 14 by the anchor bolts 10 for fixing each retaining wall installed on the concrete retaining wall 20, and the concrete retaining wall 12 enters the rock 14 from the concrete retaining wall 12 during long-term use. Rainwater or the like infiltrates, the mutual contact surface between the concrete retaining wall 12 and the bedrock 14 becomes unstable, and a displacement occurs between the concrete retaining wall 12 on the surface side and the inside bedrock 14 in any direction,
The projection 18 of the anchor bolt 16 from the concrete retaining wall 20 is inclined.

For example, as shown in FIG. 2, the concrete retaining wall 12 moves as shown by the arrow, and the projecting portion 18 of the anchor bolt 16 is displaced from the position shown by the imaginary line to the position shown by the solid line. The axis P1 is the inclined axis P
2, the axis P2 and the concrete retaining wall surface 20
When the fitting angle of the anchor plate 16 changes, the spacer plate 44 fixed to the projecting end side of the anchor bolt 16 in a cross-like manner becomes the support plate 40.
The biasing spring 52 fitted to the guide bolt 50 on the right side in FIG. Accordingly, the support plate 40 in the protective cap 26 does not tilt, and therefore, the protective cap 26 only slides while keeping the end of the opening 24 in close contact with the substrate 56 of the concrete retaining wall surface 20. Water tightness in the protective cap 26 can be maintained.

Therefore, the protection cap 26 can maintain the watertightness in the protection cap 26 while keeping the end of the opening 24 in close contact with the substrate 56 of the concrete retaining wall surface 20. Without the corrosion of the fastening nut 22, the protective cap 26 can be periodically removed to tighten and adjust the loosened fastening nut 22, thereby improving the service life of the concrete retaining wall surface. In addition, without using a large spherical washer or the like, regulated parts can be used for the fastening nut, the protective cap, the absorbing engagement portion, and the like, and the construction can be simplified and the manufacturing cost can be reduced.

[0050]

As described above, according to the anchor bolt device for retaining wall according to the first aspect, the anchor bolt penetrating the concrete retaining wall and driven into the rock, and the anchor projecting from the concrete retaining wall. With the fastening nut screwed into the protrusion of the bolt and fastened to the concrete retaining wall and the opening in contact with the concrete retaining wall side,
A protection cap that engages with the protrusion of the anchor bolt and covers the protrusion of the anchor bolt. In the protection cap, the concrete retaining wall slides away from the rock and the anchor bolt is deformed. Nevertheless, the concrete retaining wall is slid from the bedrock by providing an absorption engagement part for absorbing the width of the protective cap separating from the concrete retaining wall and keeping the protective cap in close contact with the concrete retaining wall. Even if the protruding part side of the anchor bolt is displaced and displaced, the absorbing engagement part in the protective cap always absorbs the distortion corresponding to the bending displacement on the anchor bolt end side, and always keeps the open end of the protective cap open. The seal tightly adheres to the concrete retaining wall to maintain the airtightness in the protective cap, and no corrosion occurs in the anchor bolts and fastening nuts in the cap. In addition, the tightening adjustment of the fastening nut can be easily performed on a regular basis, so that the service life of the concrete retaining wall increases.
Also, the device itself can use restricted parts for the fastening nut, the protective cap, the absorbing engagement part, etc. without using a large spherical washer, etc., and the structure is simple, so that the manufacturing cost is low. .

According to a second aspect of the present invention, the absorbing engagement portion is located within the protective cap, close to the projecting end of the anchor bolt, and free from the projecting end. An engaging member fixed to the projecting end side of the anchor bolt, and an engaging member which is always urged to be in contact with the urging reference portion; and And an urging portion for applying an urging force in a direction in which the urging reference portion is brought into contact with the urging reference portion. Even if the angle changes, only the engaging member is tilted integrally with the anchor bolt and the biasing member is tilted and deformed, but the biasing reference portion in the protective cap does not tilt. Further, the protective cap can maintain the state in which the opening end is in close contact with the concrete retaining wall surface, the watertightness in the protective cap is not reduced, and the anchor bolt and the fastening nut are not corroded.

According to a third aspect of the present invention, the urging reference portion is formed of a support plate fixed so that the protruding end portion of the anchor bolt penetrates the protection cap in a loosely fitting manner. Since the urging reference portion only needs to fix the support plate in the protective cap, the structure is simple, the manufacturing is easy, and the maintenance and inspection are also easy. In addition, the anchor bolt is loosely penetrated through the support plate fixed in the protective cap, so that the support plate does not tilt even if the anchor bolt is tilted and deformed. State can be maintained.

According to a fourth aspect of the present invention, the engaging member comprises a spacer plate disposed on the upper surface or the lower surface of the support plate and fixed to the protrusion of the anchor bolt. The structure itself is simple, manufacturing is easy, maintenance and inspection can be performed satisfactorily, and the urging reference portion is formed of a support plate, so that the plate bodies are biased and engaged synergistically with this. Therefore, the urging mechanism becomes extremely simple, not only the engagement is easy, but also the manufacturing cost can be maintained at a significantly low cost.

According to a fifth aspect of the present invention, one or a plurality of loose fitting holes are drilled in the spacer plate, and the urging portion penetrates the loose fitting hole in a loose fitting manner to form the support plate. And a biasing spring fitted to the guide bolt and biasing the spacer plate in a direction in which the spacer plate comes into contact with the support plate. Since it can be formed only from the fixed guide bolt and the biasing spring fitted to the guide bolt, the structure of the biasing portion can be formed with a very minimum number of constituent members, and the structure is simple and easy to manufacture. Further, it is possible to realize a biasing engagement mechanism of the engagement member with respect to the bias reference portion of the biasing portion of the biasing mechanism, and to achieve its effectiveness.

According to the sixth aspect, the fastening nut has a spherical surface portion which comes into contact with the concrete retaining wall side, so that when the fastening nut is fastened to the anchor bolt, the spherical surface is formed. The portion can be tightly adhered to the concrete retaining wall side and firmly fastened, and even if the anchor bolt is tilted with respect to the concrete retaining wall, the spherical portion slides and the tightened state can be reliably maintained.

According to the present invention, a substrate is fixed between the concrete retaining wall surface and the protective cap, and the spherical portion is disposed on the substrate so as to be in contact with the substrate. The lower surface periphery of the spherical portion is uniformly joined to the upper surface of the substrate, and the concrete retaining wall can be firmly fixed without causing uneven fastening.

According to the eighth aspect of the present invention, a seal ring for maintaining water tightness in the protective cap is attached to a periphery of the lower end side opening of the protective cap. When the lower end side of the protective cap is forcibly joined to the board fixed to the concrete retaining wall by engaging the absorbing engagement part with the anchor bolt, the seal ring is compressed and the oil filled in the protective cap, etc. Does not leak to the outside, or external rainwater does not seep into the protective cap, and the anchor bolts and fastening nuts in the protective cap do not corrode 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 vertical sectional view of the anchor bolt device for retaining wall fixing, showing a state in which the concrete retaining wall slides on the rock and the protrusion of the anchor bolt is displaced inclining.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a cross-sectional view showing an embodiment in which three guide bolts of an urging portion in FIG. 3 are used.

FIG. 5 is a perspective view showing a concrete retaining wall cast in place on a rock on a road slope.

6 is a longitudinal sectional view of the concrete retaining wall shown in FIG.

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 Concrete Retaining Wall 14 Rock 16 Anchor Bolt 18 Projection 20 Concrete Retaining Wall 22 Tightening Nut 24 Opening 26 Protective Cap 32 Absorption Engaging Portion 34 Energizing Reference Portion 36 Engaging Member 38 Energizing Portion 40 Support Plate 44 Spacer Plate 48 loose fitting hole 50 guide bolt 52 urging spring 54 spherical part 56 substrate 60 sealing

Claims (8)

(57) [Claims] An anchor bolt penetrated through a concrete retaining wall and driven into a rock, a fastening nut screwed into a projection of the anchor bolt projecting from the concrete retaining wall and fastened to the concrete retaining wall, A protective cap that abuts the opening on the concrete retaining wall side, engages with the projection of the anchor bolt, and covers the projection of the anchor bolt; and a concrete retaining wall inside the protective cap. Even if the anchor bolt is deformed by sliding away from the bedrock, an absorbing engagement part is provided to absorb the separation width of the protective cap from the concrete retaining wall and always keep the protective cap in close contact with the concrete retaining wall. Anchor bolt device for retaining wall fixing. 2. An urging standard, wherein the absorbing engagement portion is located within the protective cap, close to a protruding end of the anchor bolt, and is fixed to the protective cap in a free state with the protruding end. And an engaging member fixed to the protruding end of the anchor bolt and constantly urged to contact the urging reference portion, and the engaging member constantly contacting the urging reference portion. 2. An anchor bolt device for retaining wall fixing according to claim 1, further comprising an urging portion for applying an urging force in a direction in which the retaining bolt is to be made. 3. The anchor for retaining wall fixing according to claim 2, wherein said urging reference portion is formed of a support plate fixed so that a projecting end of said anchor bolt penetrates through said protective cap in a loosely fitting manner. Bolt equipment. 4. The anchor bolt for retaining wall fixing according to claim 2, wherein the engaging member comprises a spacer plate disposed on an upper surface or a lower surface side of the support plate and fixed to a protrusion of the anchor bolt. apparatus. 5. The spacer plate is perforated with one or a plurality of loose fitting holes, and the urging portion penetrates the loose fitting holes in a loose fitting manner and is fixed to the support plate in an upright manner. The anchor bolt device for retaining wall fixing according to claim 4 , comprising a bolt, and a biasing spring fitted to the guide bolt and biasing the spacer plate in a direction of contacting the support plate. 6. The anchor bolt device for retaining wall fixing according to claim 1, wherein said fastening nut has a spherical portion which abuts on said concrete retaining wall side. 7. The anchor bolt device for retaining wall fixing according to claim 6, wherein a substrate is fixed between the concrete retaining wall surface and the protective cap, and the spherical portion is disposed on the substrate so as to abut. . 8. The retaining wall fixing device according to claim 1, wherein a seal ring for maintaining water tightness in the protective cap is attached to a periphery of an opening on a lower end side of the protective cap. Anchor bolt device.