JPH0248540Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lifting and fixing device for concrete covers of public ditches, etc.

[Conventional technology]

Recently, the concept of a cab system, which consolidates electrical cables and places them underground, has been attracting attention from the viewpoint of making effective use of road space, strengthening the city's disaster prevention functions, and improving the urban landscape. This cab was originally used as a space to house supply electric wires and cables for information services, etc., which are occupied above the ground, except for water supply, sewerage, gas pipes, etc., which are housed underground. It is a facility.

As shown in Figure 1, the general structure of a community ditch is to bury a box culvert B with an open upper part under the sidewalk, and line it with a block-shaped concrete cover A with an open upper part. Then, like other general sidewalks, leveling sand and sidewalk blocks 3 are laid on top of it. This concrete cover A needs to be removable when working inside the box culvert B.

[Problem that the invention attempts to solve]

In order to make the concrete lid A as described above removable, it is conceivable to provide a means for lifting it, such as a notch or a hanging tool, but this concrete lid A is quite heavy. In addition, due to its role, the concrete cover A must be free of any notches or protrusions that may impede walking, etc., and must be designed to prevent the laid concrete cover from shifting and to be easy to remove. There are many problems that must be met, such as what can be done.

The present invention solves these problems with concrete lids, is firmly attached to concrete lids, does not normally protrude onto the sidewalk and does not obstruct walking, and when lifting concrete lids, it does not interfere with walking. It is an object of the present invention to provide a concrete lid lifting and fixing device that can be easily projected upward to facilitate lifting work.

[Means for solving problems]

The structure of the present invention will be explained with reference to FIGS. 1 to 4 corresponding to the embodiments. The present invention has a cylindrical case 4 with a brim-like head body 7a at the upper end and an external screw thread at the lower part. A lifting rod 7 with screws 7b is inserted so as to be freely movable and lockable up and down to form a lifting tool C, and the lifting tool C is inserted into the concrete cover A when the hanging rod 7 is at the upper end position. The head body 7a is buried so as to protrude above the concrete cover A, and the lower part thereof protrudes below the concrete cover A when the hanging rod 7 is at the lower end position, and on the other hand, the concrete cover A is placed. The box culvert B is characterized in that an anchor bolt 9 is embedded in the box culvert B to be screwed into the external thread 7b of the hanging rod 7.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, A is a concrete lid placed on a box culvert B, and a concrete layer 2 is filled in the lower half of a dish-shaped steel box 1 formed by raising side plates on the outer periphery of the bottom plate. In the upper half, a covering material layer 3 is laid over the concrete layer 2.

C is a lifting tool whose lower half is embedded in the concrete layer 2 at the four corners of the box 1, and whose upper end is almost flush with the upper edge of the side plate of the box 1, and which lifts the lower end of the cylindrical case 4. It is fixed and erected on the box body 1 by welding etc.
A through hole 14 corresponding to the inner diameter of the case 4 is formed in the box body 1. Inside the case 4, there are stoppers 5a at the upper and lower parts slightly below the upper end.
5b is fixed, and these stoppers 5a, 5
There are through holes 6a and 6b that penetrate vertically in the center of b.
is provided. The case 4 also has a collar-shaped head body 7a at its upper end with a diameter that allows it to be loosely inserted into the case 4, and the stopper insertion holes 6a, 6.
A suspension rod 7, which has a diameter sufficiently smaller than b and is longer than the case 4, is inserted through the insertion holes 6a and 6b, and an external screw 7b is screwed to the lower part of the suspension rod 7 over the required length, and the suspension rod 7 is inserted through the insertion holes 6a and 6b. A locking nut 8 is removably screwed to the base of an external screw 7b that protrudes downward from the hole 6b. And this hanging rod 7 is the second
3, when the locking nut 8 is pulled up until it comes into contact with the lower stopper 5b, its head body 7a protrudes above the upper surface of the concrete cover A by a required height, and the fourth As shown in the figure, when the head body 7a is lowered to the position where it abuts the upper stopper 5a, the external screw 7b has a required length such that it protrudes downward from the lower surface of the concrete cover A through the through hole 14. It is formed.

On the other hand, the box culvert B has an internal thread 9a that is screwed into the external thread 7b of the lifting rod 7 at a location corresponding to the hanging rod 7 of the lifting tool C provided on the concrete lid A.
An anchor bolt 9 provided with a screw hole is buried with its screw opening end flush with the top surface of the box culvert B. Furthermore, a splint 10 is attached to the outer surface of the side wall of the box culvert B by anchor bolts 11 to regulate the placement position of the concrete cover A.

The head body 7a of the suspension rod 7 is provided with an engagement hole for a tool for rotating it, as shown by the dotted line in the figure, and the locking nut 8 also has a similar engagement hole. It is provided as shown.

The present invention is constructed as described above, and as shown in FIG. 3b is laid, and the culvert B splints 10 and 1 are laid.
It is fitted and placed between 0 and 0. When placing the concrete lid A, as shown in FIGS. 2 and 3, the lifting rod 7 of the lifting tool C is pulled up as shown, and the head body 7a is projected above the concrete lid A. When the head body 7a is engaged with a suitable hooking device (not shown) such as a wire or a hook, and lifted, the locking nut 8 of the hanging rod 7 engages with the lower stopper 5b. The concrete lid A can be lifted up via the stopper 5b and the case 4, and then moved and lowered to a predetermined position. In that case, as shown in FIG. 3, the hanging rod 7 is positioned to approximately match the anchor bolt 9 of the culvert B. Next, the hooking tool is removed and the hanging rod 7 is lowered to match the internal thread of the anchor bolt 9, and the tool is engaged with the engagement hole of the head body 7a to rotate the hanging rod 7. As shown in the figure, hanging rod 7
The lower part of the anchor bolt 9 is screwed onto the anchor bolt 9 to fix it.
In this case, even if a slight deviation occurs due to manufacturing errors or mounting, the hanging rod 7 has a considerably smaller diameter than the insertion holes 6a and 6b, and there is a gap for play, so the position of the hanging rod 7 can be shifted appropriately to match. Can be screwed together. Also,
After screwing the hanging rod 7 to the anchor bolt 9, a plug 12 (see Fig. 4) can be fitted into the upper end of the case 4 to prevent dirt, etc. from entering the case 4. can.

When removing the concrete cover A from the culvert B, engage the tool in the engagement hole in the head 7a of the suspension rod, rotate the suspension rod 7 in the opposite direction, unscrew it from the anchor bolt 9, and remove the suspension rod. 7 is pulled up as shown in FIGS. 2 and 3, and a hooking tool is engaged with the head body 7a to lift and move it.

Furthermore, if the suspension rod 7 or the locking nut 8 is damaged, the suspension rod 7 and the engagement nut 8 can be separated and replaced at will.

[Effect of idea]

As explained above, in the device of the present invention, a hanging rod, which has a flange-like head at the upper end and an external thread at the lower end, is inserted into a cylindrical case so that it can freely move up and down and lock. to form a lifting tool, the lifting tool is inserted into the concrete lid, the head of which projects above the concrete lid when the hanging rod is in the upper end position;
The suspension rod is buried so that its lower part protrudes below the concrete lid when it is at the lower end position, and an anchor bolt that is screwed into the external thread of the suspension rod is attached to the box culvert on which the concrete lid is placed. Since it is a buried structure, when lifting or moving the concrete lid, simply rotate the hanging rod of the lifting tool buried in the concrete, and the lifting rod will protrude from the concrete lid, and It is safe and easy to lift and move, and when the concrete cover is placed on the box culvert, simply rotate the lifting rod, and the lifting rod will screw into the anchor bolt buried in the box culvert and lift the concrete lid. Not only can the lid be securely fixed, there is no risk of the concrete lid shifting;
The suspension rod has many advantages, such as being housed in a concrete lid and not protruding onto the sidewalk and causing no obstruction to traffic.

[Brief explanation of the drawing]

The drawing shows one embodiment of the device of the present invention.
Fig. 1 is a schematic longitudinal sectional view of a common ditch equipped with the device of the present invention, Fig. 2 is a longitudinal sectional view of the main part showing the box culvert and concrete cover separated, and Fig. 3 shows the hanging rod of the device. FIG. 4 is a vertical cross-sectional view of the main part showing the lifted state, and FIG. 4 is a vertical cross-sectional view showing the hanging rod screwed into the anchor bolt of the box culvert. A... Concrete lid, B... Box culvert, C... Lifting tool, 1... Dish-shaped box body, 2...
Concrete layer, 3... Surface material layer, 4... Case, 5a, 5b... Stopper, 7... Hanging rod, 7a
... Head body, 7b ... External screw, 8 ... Locking nut,
9... Anchor bolt, 9a... Internal thread.

Claims (1)

[Scope of utility model registration request] A lifting rod is formed by inserting into a cylindrical case a hanging rod having a flange-like head at the upper end and an external screw threaded at the lower portion so as to be freely movable and lockable up and down, and the lifting rod is formed by: Embedded in the concrete lid in such a way that when the hanging rod is at the upper end position, the head body protrudes above the concrete lid, and when the hanging rod is at the lower end position, the lower part thereof protrudes below the concrete lid, On the other hand, a device for lifting and fixing a concrete lid of a public ditch or the like, characterized in that an anchor bolt that is threaded into the external thread of the hanging rod is embedded in a box culvert on which the concrete lid is placed.