JPH0730745Y2 - Anchor bolt for concrete retaining wall - Google Patents

Description

[Detailed description of the device]

[0001]

This invention relates to an anchor bolt,
In particular, the present invention relates to an anchor bolt for a concrete retaining wall, which is provided with an inverted hook to improve connection strength.

[0002]

2. Description of the Related Art FIG. 12 is a schematic view of an example often seen on a mountain road. As shown in the figure, a mountain wall or a cliff 1 is formed at a portion where both sides crossing the hillside of the road 2 and the cliff 1 meet each other. It is often found that the concrete retaining wall 3 is hardened along the cliff, preventing the road from being buried, eroded or submerged due to the collapse of the mountain wall or the cliff caused by the weather or other causes. That is, as shown in FIG. 13 which is a sectional view taken along the line AA of FIG. 12, the bottom of the concrete retaining wall 3 is buried at an appropriate depth from the road surface, and the concrete retaining wall 3 is
A rebar assembly 31 is included in the rebar assembly 31.
As the anchor bolts 311, a suitable number of rebars having an appropriate thickness are extended from the concrete retaining wall 3 and are deeply inserted into the mountain wall or cliff 1, and the concrete retaining wall 3 and the mountain wall or cliff 1 are made solid. By being combined with each other, the gripping strength of the concrete retaining wall 3 prevents the mountain wall or the cliff 1 from collapsing.
However, considering the present applied technology and the structure of the concrete retaining wall 3, the concrete retaining wall 3 is buried up to a considerable depth from the road surface, and is also driven straightly into the mountain wall or the cliff 1. Since the mountain wall of the anchor bolt 311 or the tip of the cliff 1 inserted deep into the cliff 1 is formed to have a uniform outer diameter or a tapered shape, the concrete retaining wall 3 has a small gripping force regardless of the size, and often the mountain Anchor bolts 31 for landslides on walls and cliffs 1
1 relaxes and the mountain wall or cliff 1 collapses, causing a traffic accident.

[0003]

SUMMARY OF THE INVENTION In view of the problems of the conventional anchor bolts for a concrete retaining wall, the present invention provides an anchor for a concrete retaining wall, which is provided with an inverted hook to improve the pullout resistance and has a high connection and grip strength. Intended to provide bolts.

[0004]

In order to achieve the above object, the present invention provides a hollow bolt in which a shaft rod of an appropriate length extending from both ends of the bolt is swingably inserted. At least one swing arm is pivotally attached to one end of the shaft rod so as to be able to be expanded and converged by rotating in the outer diameter direction, and when the swing arm is converged, the swing arm comes into contact with the peripheral wall of the opening at one end of the bolt from the outer peripheral surface of the bolt It is configured so that it does not project, and the swing arm is further connected to one end of the pivotally attached shaft rod to provide a blocking block that limits the unfolding operation of the swing arm.

Then, a stepped portion having a reduced diameter and a tapered portion following the stepped portion are formed on the outer peripheral wall of the opening at one end of the bolt adjacent to the swing arm, or a stop block is formed in a conical shape, and The other end of the swing arm, one end of which is pivotally attached to the shaft rod, is formed obliquely outward from the shaft rod peripheral wall to form a locking block having an appropriate arc degree, and the swing motion of the shaft rod is performed. A threaded portion is formed at one end where the arm is not pivotally mounted so that a nut can be screwed into the arm. Further, the shaft rod is formed in a hollow internal shape, and one end peripheral wall is pivotally mounted to the pivot arm of the shaft rod. It is more preferable to make a through hole at an appropriate position so as to communicate with the hollow inside of the shaft rod.

[0006]

Since the present invention is constructed as described above,
Insert the tip of the blocking block into a hole drilled at an appropriate position on the mountain wall or cliff wall so as to provide an extended space at the bottom, and then fix this bolt and expose the shaft exposed outside the hole. When the nut that is screwed into the threaded portion at one end of the rod is turned, the shaft rod retreats and the swing arm is guided by the taper portion of the outer peripheral wall of the opening of the bolt and expands. It develops at an angle of approximately 90 degrees or close to 90 degrees, and abuts and engages with the peripheral wall of the hole, so that it cannot be easily pulled out. Also, by forming the shaft rod in a hollow shape and making a through hole at an appropriate position on the peripheral wall at one end where the arm of the shaft rod is pivotally attached, concrete can be smoothly poured into the expansion space through the through hole even in areas with poor soil quality. You can

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0008]

1 and 2 are a three-dimensional exploded view and an assembled sectional view showing an embodiment of the present invention.
The present invention mainly includes a bolt 40, a shaft 50, a swing arm 60, and a stop block 70. Bolt 4
Reference numeral 0 denotes a hollow tubular member, which forms side wall flat surfaces facing each other on the inner peripheral wall of the opening 401 at one end of the opening 40.
A stepped portion 401a whose diameter is reduced to one outer diameter and a taper portion 401b following the stepped portion 401a are provided. The shaft 50 is bolt 4
It is inserted so as to extend to both ends of 0, and in one of both ends,
The threaded portion 501 is provided to screw the nut 503, and the conical blocking block 70 is coupled to the other end of the bolt 40 extending from the one end provided with the taper portion 401b, and the rear end of the blocking block 70 is continued. And one or more swing arms 60 are gripped in a state where the other end is rotatable, and the swing arms 60 rotate in the outer diameter direction to be attached to the stop block 70 at a predetermined angle toward the rear end side. Contact and be restricted.

When the swing arm 60 is rotated in the outer diameter direction, as shown in the drawing, the swinging end of the swing arm 60 extends obliquely outward from the peripheral wall of the shaft rod 50, and the locking block has an appropriate degree of arc. 601 (the action of which will be described later) is formed, and when the swing arm 60 is rotated and deployed at a predetermined angle, the swing arm 60 comes into contact with the stop block 70 so that it cannot be further expanded and rotated. When it is rotated and converged to, it is adhered to the step 401a of the opening 401 so that its outer peripheral wall does not protrude from the outer peripheral wall of the bolt 40. Then, a through hole 502 penetrating the screw portion 501 in a diametrical direction.
And the nut 503 screwed with the threaded portion 501 is appropriately turned, the swing arm 60 is moved through the bolt 40.
Unfolds (the detailed operation will be described later) and is locked to the stop block 70, and is deployed at an angle of approximately 90 degrees or close to 90 degrees as shown by a virtual line in the figure ( A detailed description of the operation of the swing arm 60 will also be given later) so that further angular expansion is stopped.

3 to 6 are views for continuously displaying the usage state of the embodiment of the present invention. As can be seen from FIG. 3, before construction, a hole 80 having an appropriate hole diameter is first drilled at an appropriate position on the mountain wall or cliff, and the hole 8
An expansion space 81 is formed at the bottom of 0. And this hole 8
The rock powder in No. 0 is blown with compressed air, and then concrete with an appropriate thickness is further sprayed on the inner peripheral wall of the hole 80 (depending on the soil material, whether or not to carry out this step and the thickness are determined. The depth, the size of the expanded space 81, the hole diameter, etc. are also appropriately set according to the soil strength of the mountain wall or the cliff wall.

As can be seen from FIG. 4, the anchor bolt according to the present invention is inserted into the hole 80 when the pre-concrete spraying work is completed. Naturally, the length of the anchor bolt is a stop at the tip. The block 70 reaches the expansion space 81, and its rear end is sufficiently exposed from the screw portion 501 and the nut 503 so that the nut 503 can be protruded from the hole 80 by an appropriate length so that the turning operation can be easily performed.

FIG. 7 is an enlarged partial sectional view of the portion A in FIG. From this figure, it can be clearly seen that the tip of the anchor bolt according to the present invention is inserted into the expansion space 81 of the hole 80. That is, the blocking block 70 at the tip of the anchor bolt according to the present invention has a conical tip to help the anchor bolt to be smoothly inserted into the hole 80 (as described above, rock powder in the hole 80). Has already been blown out with compressed air), and if the nut 503 screwed to the rear end of the shaft rod 50 exposed outside the hole 80 is turned, the swing arm 60 converges and does not project from the peripheral wall of the bolt 40. Therefore, the bolt 40 can be easily inserted along the peripheral wall of the hole 80. Then, the swing arm 6
If the inner wall surface of 0 also converges, it is designed so as to come into contact with the peripheral wall of the stepped portion 401a of the bolt 40 in a slightly oblique direction. Therefore, when the anchor bolt is inserted into the hole 80,
The swing arm 60 enters the expansion space 81 at the bottom of the hole 80 in the best state. The swing arm 60 has an expansion space 81.
After the insertion, the one swinging arm 60 positioned below as shown in the drawing hangs down on the lower peripheral wall of the expansion space 81 as indicated by an imaginary line without any significant obstacle to the progress of the work.

FIG. 5 is a diagram showing the continuous operation of FIG. 4. When the operation of FIG. 4 is completed, the bolt 40 is first properly fixed, and then the nut 503 is rotated to provide the screw portion 501. The shaft 50 is retracted in the direction of the arrow. As a result, the swing arm 60 is an enlarged display view of part B of FIG.
As can be seen from FIG. 7 and FIG. 7, when the shaft 50 is retracted in the direction of the arrow, since the bolt 40 is already properly fixed, the swing arm 60 is provided with a taper step on the outer periphery of the opening 401. The nut 503 is guided by the peripheral wall to expand outward (upward and downward in the drawing), and the nut 503 is rotated until the swing arm 60 comes into close contact with the hole wall 82 of the expansion space 81 (deployment of the swing arm 60). The maximum range that can be achieved is until the outward expansion action is locked by the stop block, and the angle is approximately 90 degrees to 90 degrees with the shaft 40).
At this time, if the soil quality and the arrangement of the expansion space 81 are appropriate, the swing arm 60 is firmly fixed to the hole wall 8 of the expansion space 81.
Alternatively, as shown in FIG. 9, it can be fixed even if the swing arm 60 is locked or fitted to the hole wall 82 of the expansion space 80 by appropriately pulling it out in the direction of the arrow together with the bolt 40 as shown in FIG.

Further, FIG. 10 is a sectional view taken along line BB of FIG.
As shown, the locking block 601 of the swing arm 60 is
It has an area for increasing the contact with the hole wall 82, that is, the pressure received by the locking block 601 is distributed over a wide range, and the pressure is concentrated in a small area of the hole wall 82 to collapse the wall surface. In addition, both ends of the locking block 601 are appropriately fitted and fixed to the wall surface.

FIG. 6 is a continuous operation view of FIG. 5, in which the anchor bolt according to the present invention is attached to the hole wall 82 of the expansion space 81 with an inverted hook, and then the reinforcing bar structure 90 inside the concrete retaining wall is assembled. Work can be performed, and at this time, the reinforcing bar is formed in the through hole 502 (see FIG. 2) formed on the exposed side of the shaft rod 50.
The anchor bolts are connected to the reinforcing bar structure 90 (the anchor bolts are connected to one-to-one or one or more reinforcing bars, and the total number of connections is determined in consideration of the size of the concrete retaining wall and other conditions). If a concrete retaining wall is formed by pouring concrete, the concrete retaining wall has an improved gripping force by the anchor bolts, and thus has a good function of damming a mountain wall / cliff.

Finally, FIG. 11 shows another embodiment of the present invention, in which the shaft 51 is hollow as shown, and the shaft 51 is inserted into the expansion space 802 near the tip thereof. If the through hole 511 is also bored in the peripheral wall of the shaft and the concrete is poured into the expansion space 802 from the outside through the hollow interior of the shaft rod 51 at the time of compacting the concrete, the expansion space 802 can be smoothly moved even in an area with poor soil quality. The inside can be filled with concrete and solidly pressed into place.

[0017]

As described above, according to the present invention, after the stopper block is inserted into the hole formed at the appropriate position of the three walls or the cliff so as to have the expansion space at the bottom, When the bolt is fixed and the nut that engages with the threaded portion on the end of the shaft exposed outside the hole is turned to retract the shaft, the swing arm is guided by the tapered portion of the outer peripheral wall of the opening of the bolt. Then, by the control of the blocking block, the shaft is brought into contact with and affixed to the hole hole peripheral wall at an angle of approximately 90 degrees or close to 90 degrees with the shaft rod, so that the hole cannot be pulled out. Therefore, when a concrete retaining wall is constructed by connecting a reinforcing bar structure to one end of the shaft exposed from the hole, the force to grip the collapse of the mountain wall or cliff is higher than that of the concrete retaining wall made by the conventional construction method. Can be improved. Further, the shaft rod is also formed in a hollow shape, and a through hole is formed at an appropriate position on the peripheral wall at one end where the swing arm of the shaft rod is pivotally attached.The through hole is poured until the expansion space is filled with concrete. It can be solidly compacted, and the concrete compaction work can be performed smoothly even in areas with poor soil quality.

[Brief description of drawings]

FIG. 1 is an exploded view of an embodiment of the present invention.

FIG. 2 is an assembled sectional view of an embodiment of the present invention.

FIG. 3 is a diagram showing a continuous operation in the usage state of the above embodiment.

FIG. 4 is a diagram showing a continuous operation in the use state of the above embodiment.

FIG. 5 is a diagram showing a continuous operation in the usage state of the above embodiment.

FIG. 6 is a view showing a continuous operation in the usage state of the above embodiment.

FIG. 7 is an enlarged display view of part A in FIG.

FIG. 8 is an enlarged display view of part B in FIG.

FIG. 9 is a continuous operation display diagram of FIG.

10 is a sectional view taken along line BB in FIG.

FIG. 11 is an assembled sectional view of another embodiment of the present invention.

FIG. 12 is a view showing a conventional mountain road.

13 is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

 40 Bolt 401 Opening at One End of Bolt 50 Shaft Rod 501 Screw Part 503 Nut 511 Through Hole 60 Swing Arm 601 Locking Block 70 Blocking Block

Claims (4)

[Scope of utility model registration request] 1. A stepped portion (401) having a reduced outer diameter at one end.
a) The hollow bolt (40) formed with the bolt (4) is slidably inserted into the bolt (40),
Shaft rod (50) having a length extending from both ends of (0),
At least one swing arm (60) pivotally attached to one end of the shaft rod (50) so as to be rotatable in the outer diameter direction, and the swing arm (60) of the shaft rod (50) are pivoted. A stop block (70) provided at the end on the side where the swing arm (60) is mounted to limit the unfolding operation of the swing arm (60), and the swing arm (60) has the bolt (40) when converged. Of the locking block (60) which is in contact with the stepped portion (401a) at one end of the
1) and when the shaft rod (50) is moved in the direction opposite to the blocking block (70), the bolt (4)
An anchor bolt for a concrete retaining wall, which is guided to one end of 0) and is developed outward. 2. A stepped portion (401a) having a reduced diameter on a peripheral wall of an opening (401) at one end of the bolt (40) adjacent to the swing arm (60) and a tapered portion (4) following the stepped portion (401a).
01b) and the blocking block (70) is conical in shape. 3. The swing arm (6) of the shaft rod (50).
The anchor bolt for a concrete retaining wall according to claim 1, wherein a threaded portion (501) is formed at one end on the side where 0) is not pivotally attached, and a nut (503) is screwed. 4. The shaft rod (50) is formed in a hollow internal shape, and a through hole (511) is formed at an appropriate position on one circumferential wall of the shaft rod (50) at which one end of the swing arm (60) is pivotally mounted. Wear
The anchor bolt for a concrete retaining wall according to claim 1, which is adapted to communicate with the hollow inside of the shaft rod (50).