JPH0348280Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a rock fall preventer for manhole construction, which is used during manhole repair work.

<Conventional technology> Manhole repair work needs to be carried out periodically, and once a manhole has been constructed, the area around it is dug up and the steel frame or block frame replaced. ing. Manholes are for sewerage, telephone wiring, gas,
It is provided for repairing electrical wiring.
Sewage, electrical conduit, and gas piping run inside. In the past, during manhole construction, when the surrounding area was excavated or the iron frame or block frame was removed, crushed stones, earth and sand from the surrounding area often fell into the manhole. In the past, efforts were made to prevent rocks from falling into the manhole by taking care not to fall into the manhole. It was the current situation. Therefore, it has the disadvantage that the inside of the manhole must be cleaned from time to time.

<Problems that the invention attempts to solve> As mentioned above, in conventional manhole construction,
When excavating around manholes or removing manhole iron frames and block frames, crushed stones, earth and sand sometimes fall into manholes, and this cannot be prevented. Electrical wiring pipes, gas piping, etc. run through the manhole, and sewage flows through it, but if the falling objects hit the manhole, the electrical wiring pipes or gas piping may be damaged, or in the case of sewage, the flow path may be damaged. There were problems such as falling objects accumulating on the ground and interfering with the flow of sewage. For this reason, not only is it necessary to be extra careful not to drop crushed stones and the like during manhole construction, but it has been impossible to prevent crushed stones and the like from falling no matter how much precautions are taken. This crushed stone etc. needs to be removed by entering the manhole.
There were many places in the manholes where there was a lack of oxygen, making removal of earth and sand a dangerous task.

The present invention provides a completely new rockfall preventer for manhole construction that eliminates all of the above-mentioned major problems that have traditionally been a major problem in manhole construction, and eliminates concerns about dangers such as falling rocks during manhole construction. be.

<Means for solving the problems> The present invention solves all the problems mentioned above. That is, the present invention includes a bucket 1 having a circular opening at the top and a bag-like bottom, a rigid belt 2 stretched around the inner circumference of the opening of the bucket, two telescopic cylinders 3 extending outward from the center, and one cylinder. The telescopic cylinder 3 and the tip of the hydraulic cylinder 4 of the jack 5 are brought into contact with the inner periphery of the opening of the bucket 1 via the rigid belt 2, and by the extension of the hydraulic cylinder 4, Pressing each telescopic cylinder 3 outward,
This rock fall preventer for manhole construction is characterized in that a bucket 1 is pressed and fixed to the inner peripheral edge of the manhole by jacks 5.

<Example and operation> The bucket bag 1 has a circular opening at the top and a bottomed bag at the bottom, and the area around the opening is reinforced with a belt-like reinforcing cloth. A hanging belt 6 is provided. A rigid belt 2 is stretched around the inner periphery 1 of the opening of the bucket 1. This rigid belt 2 is preferably made of steel.

Furthermore, the rigid belt 2 is used by being stretched along the inner circumference of the circular opening of the bucket 1, and is used for the purpose of aligning the circular opening with the inner circumference of the manhole, so the rigid belt 2 is slightly longer than the inner circumference of the opening. Both ends are not connected and fixed so that the diameter of the opening of the bag can be changed somewhat depending on the expansion and contraction of the telescoping cylinder. It should be noted that this rigid belt can be set in advance on the bucket bag 1 by means of belt loops provided in an appropriate number along the inner periphery of the circular opening of the bag bag 1.

The jack 5 for fixing the bucket 1 has a core at its center, and two telescopic cylinders 3 and one hydraulic cylinder 4 extend outward from the core in three directions. A hydraulic opening/closing valve 10 is attached to an appropriate position of the hydraulic cylinder 4.

The present invention is constructed as described above, and its use is as follows.

First, the rigid belt 2 is stretched around the inner peripheral edge of the circular opening of the bucket 1. Next, add 5 jacks to 1 bucket.
The jack 5 is fixed by extending the hydraulic cylinder 4 so that the extensible cylinder 3 and the tip of the hydraulic cylinder 4 of the jack 5 are located inside the hanging belt 6 installation part of the bucket 1. At this time, the hydraulic cylinder 4 is extended by operating the hydraulic opening/closing valve 10 of the hydraulic cylinder 4,
The tip of the telescopic cylinder 3 and the hydraulic cylinder 4 press the rigid belt 2 provided on the inner periphery of the upper end of the bucket 1, and the jack 5 presses and expands the entire opening, and the jack 5 is fixed to the extent that the bucket 1 and the jack are fixed. Set 5. In this state, while hanging the suspension belt 6 from above with the unit,
into manhole 8. Position the area around the opening of the bucket 1 on the lower inner peripheral edge 9 of the manhole 8, and then operate the hydraulic opening/closing valve 10 of the hydraulic cylinder 4 in that position to further push the telescopic cylinder 3 and the hydraulic cylinder 4 outward. do. By this pressing, the periphery of the opening of the bucket bag 1 is pressed and fixed to the inner circumferential edge 9 of the manhole from the inside. In this way, the rock fall preventer is set in the manhole 8.
After this, replacement work will be carried out around the manhole, but during this work, crushed stones and earth around the manhole will fall into the rock fall preventer set inside the manhole and accumulate in the bucket of this rock fall preventer. Become. After the area around the manhole has been dismantled, the suspension belt 6 is lifted up again by the unit, and in this state, the hydraulic opening/closing valve 10 of the hydraulic cylinder 4 is operated to release the extension pressure of the hydraulic cylinder 4 and the telescopic cylinder 3. Then, the bucket 1 Since the press and fixation to the inner peripheral edge 9 of the manhole is released, the unit is raised as it is and the entire rockfall preventer is taken out of the manhole, and the falling objects accumulated in the bucket 1 are removed.

Incidentally, when there is a large amount of falling rocks, the hanging belt 6 may be hung as a unit even during work to ensure that the bucket 1 is maintained.

Further, among the cylinders provided in the jack 5, the telescopic cylinder 3 extending in two directions other than the hydraulic cylinder 4 may be one that can be slightly extended or contracted depending on the size of the manhole, for example, by attaching a stop pin. It may also have a structure having two to three stages of elasticity.

Furthermore, the tip portions of the telescoping cylinder 3 and the hydraulic cylinder 4 are preferably plate-shaped ends 7 so that they can be easily fixed to the periphery.

<Effects of the invention> As described above, the invention has the following effects.

That is, it is a rock fall preventer that can be installed inside a manhole to ensure safety, and can completely prevent crushed stones and earth from falling into the manhole during manhole construction. Therefore, there is no risk of damage to the various piping inside the manhole, and there is no fear of it falling into the sewer. Therefore, various piping repairs, which were previously necessary for this type of work, are no longer necessary. Furthermore, the user is freed from the dangerous work of cleaning the inside of a manhole that is in an oxygen-deficient state, making it possible to carry out safe and reliable manhole construction.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the rock fall preventer of the present invention, and FIG. 2 is a perspective view of the rock fall preventer set in a manhole. 1... Bucket, 2... Rigid belt, 3... Telescopic cylinder, 4... Hydraulic cylinder, 5... Hydraulic jack, 6... Hanging belt.

Claims (1)

[Scope of utility model registration request] A bucket 1 having a circular opening at the top and a bag-like bottom, a rigid belt 2 stretched around the inner circumference of the opening of the bucket 1, two telescoping cylinders 3 and one hydraulic cylinder 4 extending outward from the center. The ends of the telescoping cylinder 3 and hydraulic cylinder 4 of the jack 5 are brought into contact with the inner periphery of the opening of the bucket 1 via the rigid belt 2, and as the hydraulic cylinder 4 extends, the ends of the jack 5 extend outward. A rock fall preventer for manhole construction, characterized in that a bucket 1 is fixed to the inner peripheral edge of a manhole by pressing a telescopic cylinder 3 and a jack 5.