JPH06146312A - Reformable foot-holder - Google Patents

Abstract

PURPOSE:To provide a reformable foot-holder capable of replacing easily the existing foot-holder of the internal wall of a man-hole. CONSTITUTION:A foot-holder 2 having an embedded section 2c of the front end thereof embedded into an insertion hole 1a bored in the internal wall surface 1 of a man-hole approximately in horizontal to load forms a through-hole 4 along the axial center inside the embedded section 2c, a reduced diameter section 9 is provided to the front of the embedded section of the through-hole 4 and, at the same time, a divided groove 8 is formed along the axis, and a fitting bar 10 inserted into the through-hole 4 is driven when the embedded section 2c is fitted to the insertion hole 1a. When the insertion hole 1a having the same diameter as that of the embedded section 2c is formed in the internal wall surface 1 to insert the embedded section 2c, it is kept as it is. At that time, when the fitting bar 10 is inserted into the through-hole 4 to drive, cut pieces of the front made by the divided groove 8 are respectively bent outward to push the wall surface, and according to the constitution, the foot-holder 2 is provided to the internal wall surface 1 of the man-hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foot rest for reforming, which is installed by drilling a hole in an existing manhole made of concrete.

[0002]

2. Description of the Related Art Conventionally, manholes are provided at appropriate intervals in conduits for water and sewage provided underground, so that they can communicate with the ground. Usually, the manhole main body is made of concrete and has a predetermined length, and the manhole main body is connected and used at an embedding place. On the inner wall of the manhole, a plurality of scaffolds for workers are provided at intervals in the vertical direction. As a scaffolding, a substantially U-shaped footrest or the like in which a support portion and an embedded portion are connected to each other on both sides of the footrest portion is used.

Although the footrests have been subjected to treatment such as rust prevention, they are replaced for a predetermined number of years or as appropriate for maintenance management. The replacement work is to remove all the footrests from the manhole body from the embedding part, to make a hole larger than the embedding part of the replacement footrest to install the embedding part, and to fill the gap with concrete. Is.

[0004]

However, the space inside the cylindrical manhole is generally small, and the work activities such as hole opening, horizontal holding of the embedded portion, and filling of concrete are restricted, and the work of replacing the footrest is complicated. It is something. For this reason, the entire manhole itself may be replaced, which is very problematic in terms of labor and cost.

It is an object of the present invention to provide a footrest for remodeling in which the footrest on the inner wall of the manhole can be easily replaced.

[0006]

In order to achieve the above object, the present invention provides a footrest in which an embedding portion at the tip of a footrest is embedded in an insertion hole opened substantially horizontally on an inner wall surface of a manhole. In the tool, an insertion hole is formed inside the embedded portion along an axis, a reduced diameter portion is provided at the embedded portion tip portion of the insertion hole, and a split groove is formed along the axis to insert the insertion portion. The fitting rod inserted into the hole is driven when the embedded portion is fitted into the insertion hole.

Further, in the above footrest, the alignment surface is formed at the base of the embedding portion in a direction intersecting the axis so as to come into contact with the wall surface of the edge portion of the insertion hole formed in the inner wall surface. .

[0008]

Since the present invention is configured as described above, when the insertion hole is formed in the inner wall surface of the manhole and has the same diameter as the outer diameter of the embedding portion, the embedding portion is retained as it is. become. At this time, when the fitting rod is inserted into the insertion hole and driven by an external force, the fitting rod comes into pressure contact with the reduced diameter portion,
A force in the centrifugal direction is generated, and the front section of the split groove is bent outward and presses the wall surface, whereby the footrest is attached to the inner wall surface of the manhole.

Further, when the inner wall surface of the manhole is inclined, the alignment surface abuts against the inner wall surface, so that the installation state can be reliably maintained.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 to 3, a foot rest 2 for remodeling mounted on a concrete wall 1 of a manhole.
The core material is made of aluminum, FRP, or the like, and the surface layer 3 is made of synthetic resin so as to have a non-slip pattern. In the footrest 2, the core material of the support portion 2b and the embedded portion 2c at the tip thereof is screwed on both sides of the core material of the footrest portion 2a, and almost the whole is covered with a synthetic resin. Since the footrest 2 formed in a U-shape is attached to the curved surface deviated from the center in the embodiment, the left and right support portions
The length of 2b is different.

An insertion hole 4 is formed in the support portion 2b and the embedded portion 2c along the axis, and a hole 5 extends through the insertion hole 4 and penetrates the footrest portion 2a. Further, at the opening of the hole 5, a hole 6 having a larger inner diameter than the insertion hole 4 is formed in the covered surface layer 3. A plurality of protruding step portions 7 are formed in an annular shape on the outer circumference of the embedded portion 2c, and a split groove 8 is formed in a cross shape from the tip end portion,
The insertion hole 4 in the front portion is formed with a step-like reduced diameter portion 9 that becomes narrower as it approaches the tip portion.

A fitting rod 10 having a thin tip and a rounded rear end is press-fitted into the insertion hole 4, and a ring-shaped groove 11 is provided at a position corresponding to the position of the reduced diameter portion 9 at the time of insertion. Are formed in plural. A putty 12 is embedded in the hole 6 made of synthetic resin at the rear end of the fitting rod 10 to seal it and shut off moisture. A fluorescent agent and a luminescent agent may be mixed in the putty, and the fitting rod 3 may protrude from the tip of the embedded portion 2a when driven.

The footrest 2 shown above can be easily attached by forming an insertion hole in an existing manhole. First, as shown in FIG. 4, the manhole 13 is assembled on the manhole, the winch 14 and the pulley 15 are provided, respectively, and the double punching device 17 is connected to the wire 18 via the centering jig 16.
Then hang it in the manhole. The double-drilling device 17 has pressing mechanisms 19 at the upper and lower positions, two drills 20 are horizontally provided, and a gap adjusting member 21 is attached to the opposite side.
Then, adjust the length of the wire 18 to determine the height position,
The axial center of the drill 20 is horizontally fixed by the pressing mechanism 19 and the gap adjusting member 21, and the insertion hole 1a having the same outer diameter as the embedded portion 2c is formed.

Next, by inserting the embedded portion 2c into the insertion hole 1a, the footrest 2 is held horizontally without using a jig. When the fitting rod 10 is inserted into the insertion hole 4, it abuts on the reduced diameter portion 9 and stops. Therefore, when the fitting rod 10 is driven by an external force, the fitting rod 10 is further advanced, and the ring-shaped groove 11 of the fitting rod 10 is reduced. Each of the tips of the embedded portions 2c formed by the split grooves 8 is bent in the centrifugal direction and presses the inner peripheral surface of the insertion hole 1a of the concrete wall 1. As a result, falling off is prevented and the footrest 2 is attached to the concrete wall 1. After that, the water vapor can be shut off by filling the hole 6 with the putty 12.

Next, another embodiment will be described with reference to FIGS. In this footrest 2, the boundary end face 22 is formed at the boundary between the embedded portion 2c and the support portion 2b by making the thickness of the support portion 2b larger than the thickness of the embedded portion 2c. At the boundary end face 22,
Since the concrete wall 1 is bent in the horizontal direction, it forms an alignment surface 22a along the edge of the insertion hole 1a. Therefore, when the embedded portion 2c is fitted into the insertion hole 1a, the alignment surface 22a of the boundary end face 22 is in close contact with the concrete wall 1 for positioning and horizontal holding.

Next, when the fitting rod 10 is driven in, each tip of the embedded portion is expanded in the centrifugal direction and presses the inner peripheral surface of the insertion hole 1a of the concrete wall 1. At this time, since the matching surface 22a holds the support portion 2b against the driving action, the pressing force can be applied to the fitting rod 10 in a concentrated manner, and the displacement of the footrest 2 can be prevented. . Therefore, the footrest 2 can be securely fixed.

Next, the footrest 2 shown in FIG. 9 to FIG.
Align the matching surface 22a applicable to the concrete wall 1 whose inner peripheral surface is formed so as to spread downward to the boundary end surface.
It is formed above and to the side of 22. Further, as shown in FIG. 12, the footrest 2 having the matching surfaces 22a closely and downwardly attached to each other can be used for the concrete wall 1 whose inner peripheral surface has a diameter reduced downward.

In addition, the footrest 2 shown in FIGS. 13 and 14
Is a rod-shaped member, and since there is only one embedded portion 2c, it can be attached without considering the balance of the embedded portions 2c on the left and right as compared with the footrest 2 described above, and can be attached more easily. Further, the fitting rod 10 may protrude from the tip of the embedding portion 2c at the time of mounting, and the fitting rod 10 is driven into the space a for filling the putty 12 in an extra amount.

[0019]

EFFECTS OF THE INVENTION Since the present invention is constituted as described above, the foot can be easily mounted by inserting the embedded portion of the footrest into the hole formed in the wall surface of the manhole body and press-fitting the fitting rod. The hook can be attached to the manhole wall, which is easier than the conventional replacement work, and the effect that the maintenance cost can be significantly reduced can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embedded state of a footrest for reform according to an embodiment of the present invention.

FIG. 2 is a side view of the footrest of FIG.

FIG. 3 is an exploded perspective view of the footrest for reform of the embodiment.

FIG. 4 is a side view showing an installed state of a two-hole perforation device for mounting the footrest of the embodiment, in which a hole is formed in the inner wall of the manhole.

FIG. 5 is a plan view showing an embedded state of the driving-type footrest according to the embodiment of the present invention.

FIG. 6 is a side view of a main part of the footwear shown in FIG.

FIG. 7 is a side view of the essential parts showing the embedded state of the footwear shown in FIG.

FIG. 8 is a plan view of the manhole showing an embedded state of the footrest shown in FIG.

FIG. 9 is a plan view showing an embedded state of a footrest of another embodiment.

FIG. 10 is a side view of a main part of the footrest shown in FIG.

11 is a side view of the essential parts showing the embedded state of the footwear shown in FIG. 9. FIG.

FIG. 12 is a side view of the essential parts showing the embedded state of the footrest of another embodiment.

FIG. 13 is a side view showing a footrest of another embodiment.

14 is a development view of the footrest shown in FIG. 13. FIG.

[Explanation of symbols]

 1 Wall surface 1a hole 2 Foot tool 2c Embedded part 4 Insertion hole 8 Split groove 9 Reduced diameter part 10 Fitting rod

Claims (2)

[Claims] 1. A footrest in which an embedding portion at the tip of the footrest is embedded in an insertion hole formed substantially horizontally on an inner wall surface of a manhole and is mounted along the axis inside the embedding portion. An insertion hole is formed, a reduced diameter portion is provided at the embedding portion tip of the insertion hole, a split groove is formed along the axis, and a fitting rod to be inserted into the insertion hole is inserted into the insertion hole. A footrest for reform, characterized in that it is designed to be driven when the insertion portion is fitted. 2. A matching surface that abuts a wall surface of an edge portion of an insertion hole formed in the inner wall surface is formed in a base portion of the embedded portion of the footrest in a direction intersecting the axis. Footwear for remodeling described.