JPS6156376B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separation prevention device in a concrete chute in which concrete, mortar, etc. are dropped vertically downward with a high head.

For example, construction projects that require materials such as concrete to be supplied vertically downward, such as supplying concrete vertically into a tunnel with a high head from a ventilation shaft required when excavating a long tunnel, have recently begun. , is gradually increasing, and along with this, the gap in the supply of materials such as concrete is also becoming larger and larger.

By the way, as a conventional device for supplying concrete vertically downward with a high head, for example,
As detailed in Publication No. 126033, buckets, steel pipe chute, etc. are known, but they all have their drawbacks, such as the quality of the poured concrete, the protection of reinforcing bars and buried objects in the poured area, and the construction work. It had various problems such as stability.

However, recently, ease of handling,
Attempts have been made to use flexible hoses to reduce weight, and these efforts have been successful.

However, when using such a hose, the concern is the separation of concrete, and when concrete is supplied falling at a high drop, if the flow rate is high, separation of concrete will occur during the fall, and the unfinished outlet It becomes impossible to pour concrete directly into the formwork.

Therefore, in order to deal with such problems, various studies have been carried out for some time, and the above-mentioned Japanese Patent Laid-Open Publication No. 52-197-1 has developed a method or device that can continuously drop concrete without separating it and reducing the falling speed.
Various proposals were made, including No. 126033.

Among these, as is clear from the publication, the device disclosed in JP-A-52-126033 is a device that flattens the hose, causes it to flow down intermittently, and reduces the falling speed by frictional resistance with the inner surface of the hose. Although this reduces the falling speed, the hose is damaged due to friction between the inner surface of the hose and the concrete, leaving problems with durability.

In addition, there are some hoses that have a small protrusion on the inner surface of the hose and a separation prevention device in the center of the hopper, but the small protrusion on the inner surface of the hose is not very useful in reducing the falling speed, and on the contrary, the separation of the center part is prevented. There is a problem of progress, and it cannot be said that it is still sufficient.

The purpose of the present invention is to address the above-mentioned actual situation, further solve the problem, and provide a concrete chute that more completely prevents separation of concrete and also allows continuous and smooth concrete flow treatment. That is.

That is, the feature of the present invention is that below a predetermined length of flexible hose provided with an upper hopper,
In the intermediate hopper of the concrete chute, in which a required number of intermediate hoppers each having a flexible hose attached to the lower part thereof are successively installed, an elastic tongue piece is placed inside the intermediate hopper in one or more stages, and one end thereof is connected to the intermediate hopper. The device is configured such that the other free end side faces the center and is elastically disposed such that the left and right sides face each other at least.

Hereinafter, the present invention will be described in more detail based on the accompanying drawings.

1 to 4 show one embodiment of the device according to the present invention, and FIG. 1 shows a usage mode of a concrete chute to which the device of the present invention is applied.

That is, in the figure, 1 is a shaft installed for example to form a tunnel during excavation, and it can be as long as 150 m or more, and concrete is continuously poured into the upper hopper 3 from a ready-mixed concrete truck 2 running on the ground. A flexible hose 4 is attached to the upper hopper 3, and second, third, etc. intermediate hoppers 5, 5', etc. are connected to the flexible hose 4.
The figure shows a mode in which the water is supplied to the lower part of the shaft 1 through flexible hoses 6, 6', etc. attached to the lower part of the hopper.

Here, the flexible hoses 4, 6, 6'... attached to the lower part of each hopper 3, 5, 5'... are made of mainly synthetic fiber yarns, such as nylon or polyester yarns arranged in a warp or diagonal manner. It consists of fiber threads embedded in a layer of synthetic resin such as vinyl chloride resin, and has a flat cross-section, and some of this itself has already been used. and,
These hoses 4, 6, 6'... are usually about 30
It is cut into lengths of about 300 ft (m) and attached and fixed to the hopper.

However, as described above, if the falling speed of concrete is high when the concrete is flowing down as described above, separation of the concrete distribution will occur and wear of the brake part in the hose will occur, as described above. The configuration shown below and described below is adopted.

FIG. 2 is a diagram showing the main parts of the same, and shows the hopper 3, 5, 5' of the hanging chute suspended by the wire 7, the lower hose 4,
6, 6'... are attached to the outer surface at one or more locations at appropriate intervals, consisting of a pair of elongated elastic sheets 9 of appropriate length as shown in FIG. , the cross section of the hose is held flat to slow down the concrete flowing down inside the hose.

Note that the elongated elastic sheet 9 in the clamping tool 8
Although an elastic material such as a urethane rubber sheet can be used, a flexible hose cut into rings can also be used.

In this case, it is desirable to cut the hose into rings on both sides as appropriate, and fix both sides with rivets 10 or the like to form a curved sheet.

However, it is also effective to cut a hose of an appropriate length into a flat shape, apply this to both sides of the flexible hoses 4, 6, 6', etc. at the bottom of the hopper, and fasten them on both sides.

However, the clamping tool alone is not sufficient to slow down the flow rate of concrete and prevent separation.

Therefore, in the intermediate hoppers 5, 5'...
A prevention device is provided which forms the essential part of the present invention.

Reference numbers 11 and 11' provided oppositely inside the intermediate hoppers 5 and 5' in FIG. Compatible mounting plate 1
One end is fixed to 2 by a bolt 13 or the like, and the hopper 2 extends freely toward the center, and is attached to intermediate hoppers 5, 5' in one or more stages, facing each other.

Of course, normally a pair of left and right opposing elastic tongues 1
1 and 11' are common, but it goes without saying that a four-sided or three-sided opposing structure may be adopted depending on the cross-sectional shape of the hopper. It is also possible for the opposing elastic tongues to have some phase shift in their length direction.

Here, the elastic tongues 11, 11' can most easily be made of urethane rubber sheets, but more effectively, a flexible hose, such as one used for a chute, is cut into rounds of appropriate length, and the center axis thereof It is folded in two in a V-shape along , the folded part is the free end facing the center, and the other open end is fixed to the mounting plate 12 with bolts 13 or the like.

In this way, the elasticity at the left and right opposing ends becomes more effective, and is more effective in preventing separation than some elastic sheets.

In addition, each of the opposing left and right elastic tongue pieces 11, 11'
The gap formed by the free tip of the concrete actively suppresses the flow rate of the concrete, and
This is determined from the viewpoint of preventing the separation of aggregate and sand, and preferably up to a predetermined amount of concrete can be held on both of the opposing elastic tongues 11, 11';11' is opened against the repulsive force so that the concrete can flow down.

Therefore, it is important to consider the material of which the elastic tongues 11, 11' are made and to provide them with resiliency.

In addition, in order to have a braking effect due to the deceleration of the concrete flowing speed, it is also preferable to strengthen the inner surfaces of the flexible hoses 4, 6, 6' that make up the chute to increase their wear resistance. A urethane coating or the like with high wear resistance should be formed on the surface.

Further, in FIG. 2, numerals 14 and 15 are load limiters for setting loads in advance to ensure safety.

The device of the present invention is constructed as described above, and its operation and effect will be explained next. As shown in FIG. Inject continuously.

Concrete continuously flows into the hose 4 from the lower opening of the upper hopper 3 through the hose attachment ring and flows down the hose.

At that time, the concrete bulges out through the hose 4 by itself and flows down, but due to the resistance caused by the horizontally long flat rectangular shape formed by the clamping tool 8 of the hose 4 itself, the concrete falls at a reduced flow rate, and the concrete falls from the intermediate first It falls onto the elastic tongues 11, 11' of the hopper 5. The concrete that has fallen onto the elastic tongues 11, 11' is decelerated to zero until a predetermined amount of concrete falls and accumulates.

Thus, when a predetermined amount of concrete accumulates, it falls downward against the repulsive force of the elastic tongues 11, 11' and accumulates again on the next stage of elastic tongues 11, 11'.

In this way, in the intermediate first hopper 5, the falling speed of the concrete is reduced, and the concrete falls as it accumulates, so that separation of the concrete does not occur.
It passes through the intermediate first hopper 5, passes through the lower flexible hose 6', and reaches the intermediate second hopper 5' again.
The same accumulation and falling as in the first hopper 5 is repeated.

Thereafter, the flow speed is similarly reduced by the respective elastic tongues provided in each intermediate hopper, and the concrete flows downward smoothly without separating or clogging the hoppers, and flows down the shaft. Concrete can be placed within 1.

In addition, if the elastic tongue piece becomes worn out, it can be easily replaced by removing the bolt as appropriate.

In addition, it is not necessary for the intermediate hopper to apply the same elastic force to the elastic tongue pieces sequentially from the first hopper to the lower hopper, and it is possible to change the elastic force at any time. Even in the intermediate hopper, when there are multiple stages, it is not necessarily necessary to have the same repulsive force.

As described above, the device of the present invention provides fall resistance by the resistance of the flat-shaped hose, and further provides fall resistance by the clamping device, which not only provides a deceleration effect, but also provides a deceleration effect. Since an intermediate hopper is provided, the concrete that falls here is decelerated to zero until it matches the repulsive force of the elastic tongues, and from this point on, once the concrete has accumulated more than a predetermined amount, it begins to flow down, and the concrete is decelerated to a predetermined rate while being decelerated by the hose. Therefore, by determining the length of the hose appropriately and installing an appropriate number of hoses in multiple stages, it is possible to easily slow down the concrete, no matter how high the head is. It is extremely effective in preventing concrete from separating and scattering, which is currently the biggest concern, and because it utilizes the resiliency of the elastic tongues, it decelerates smoothly unlike a simple backing plate. By selecting the force, it is possible to arbitrarily set the rate of decrease in flow velocity, thereby improving the quality of concrete and ensuring safety, and the practical effects are remarkable.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of how the device of the present invention is used in a tunnel shaft, Fig. 2 is a partial outline showing the main parts of the device of the present invention, and Fig. 3 is an example of a clamping device. FIG. 4 is an enlarged cross-sectional view showing the manner in which the elastic tongue piece is attached within the intermediate hopper, which is a characteristic feature of the present invention. 3... Upper hopper, 4... Soft flexible hose, 5, 5'... Middle hopper, 6, 6'... Soft flexible hose, 11, 11'... Elastic tongue piece, 12
...Mounting plate, 13...bolts.

Claims (1)

[Scope of Claims] 1. A concrete chute comprising a predetermined length of flexible hose equipped with an upper hopper and a required number of intermediate hoppers each having a flexible hose attached to the lower part thereof successively installed. In the intermediate hopper, one or more stages of elastic tongues are provided inside the intermediate hopper, one end of which is fixed to the intermediate hopper, and the other free end of the tongue piece is directed toward the center in an elastic manner and at least on the left and right sides. A concrete separation prevention device characterized by being arranged so as to face each other. 2. The concrete chute separation prevention device according to claim 1, wherein the elastic tongue piece is made of a polyurethane sheet material. 3. Claim 1 consisting of a double U-shaped piece formed by forming a flat synthetic resin hose with elastic tongue pieces cut into rounds at appropriate lengths and folding the hose in half from its central axis to form a U-shape. The described concrete chute separation prevention device. 4. The concrete chute separation prevention device according to claim 2, wherein the hose is a synthetic resin hose in which fiber threads arranged obliquely or intersectingly are embedded in a synthetic resin layer.