JPH01190823A - Device for settling slurry under-water - Google Patents

Abstract

PURPOSE:To make it possible to settle uniform slurry under-water by arranging a support plate onto the top of a slurry settling pipe, which is bottomed on the water bed to support the settling pipe, while being spaced from a discharge opening, and thereby additionally mounting a float at the upper section of the settling pipe. CONSTITUTION:A slurry settling pipe 2 is connected with the slurry feed pipe 1 of an under-water settling device A, and let it be lowered down to the water bed G with it vertically held in a state that a float 3 is mounted at the upper section of the settling pipe 2. Then, slurry is fed into the settling pipe 2 through the feed pipe 1 so as to let slurry be discharged out of a discharge opening located at the tip end of the settling pipe 2 so that slurry is settled on the water bed G while the discharge opening is kept buried all the time.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an underwater slurry casting apparatus suitable for casting slurry-like substances such as concrete, mortar, and coal ash slurry into water.

``Prior art'' Conventionally, in order to place this kind of slurry-like material underwater, for example, a large number of tremor pipes are connected together and then lowered from a scaffold or a ship via a suspension frame until it reaches the bottom of the water. In some cases, an on-off valve (such as a pinge valve) for opening and closing the discharge port of the tremor pipe is installed at the bottom end, and the discharge port at the tip of the tremor pipe is placed at the casting position at the bottom of the water, and the slurry is dropped in or pumped. The slurry-like material is placed on the bottom of the water by pressure feeding or other means.

``Problem to be solved by the invention'' In the conventional underwater casting device for slurry,
Because the tremor tube is suspended from a scaffold or a ship, the discharge section at the tip is susceptible to the effects of waves, ocean currents, and tidal level fluctuations, and when it swings, water gets mixed into the slurry. There were problems in that it impaired the quality of the slurry and polluted the surrounding water.

Moreover, with conventional underwater pouring equipment, air is mixed in the slurry before it is discharged from the discharge port, so when the air escapes from the slurry immediately after pouring, it mixes with the surrounding water, impairing the quality of the slurry. There is also the problem that it pollutes the surrounding water.

The present invention has been made in view of the problems of the prior art described above, and its purpose is to be able to cast homogeneous slurry underwater without impairing the quality of the slurry, and to An object of the present invention is to provide an underwater pouring device for slurry that is free from the risk of contaminating water.

"Means for Solving the Problems" In order to achieve the above object, the underwater slurry casting device of the present invention feeds slurry through a slurry supply pipe to a slurry casting pipe having a discharge port near the bottom of the water,
An underwater slurry casting device configured to discharge slurry toward the bottom of the water from its discharge port and cast the slurry on the bottom of the water, the slurry casting pipe being connected to the tip of the slurry casting pipe so that the slurry reaches the bottom of the water. A support plate supporting the slurry is disposed at a distance from the discharge port, and a float is attached to the second part of the slurry pouring pipe.

The slurry casting pipe can also be formed by simply connecting tremor pipes, etc., but if a part of the slurry casting pipe is a flexible pipe, the two parts of the slurry casting pipe can be formed by shaking due to waves. It is particularly effective in stabilizing the discharge port.

In addition, in order to achieve the above object, the underwater casting device for slurry = 3- feeds the slurry through a slurry supply pipe to a slurry casting pipe having a discharge port near the water bottom, and from the discharge port to the water bottom. This underwater slurry casting device is configured to cast slurry by discharging the slurry toward the target, and a housing having a diameter larger than that of the slurry supply pipe or the slurry casting pipe is provided in the middle of the slurry supply pipe or the slurry casting pipe, and the inside of the housing is A retention chamber may be formed in which the slurry is retained, and the housing may be provided with an air vent valve that communicates with an air pocket in the retention chamber.

``Function'' In the underwater slurry casting device configured as described above, when the slurry casting pipe is dropped to the bottom of the water, the support plate at the tip of the slurry casting pipe will drop to the bottom of the water or to the improvement where slurry has already been cast. The slurry casting pipe is supported on the bottom of the water by landing on the top surface, and the float installed at the top of the slurry casting pipe maintains the verticality of the slurry casting pipe, so that the discharge port at the tip of the slurry casting pipe is acts to always maintain a constant position.

For the reasons mentioned above, if part of the slurry pouring pipe is made flexible, the stability of the discharge port can be maintained because the flexible tube absorbs the vibrations of the pouring pipe itself caused by waves. ” 2 is valid.

In addition, in an underwater pouring device in which a housing with a slurry retention chamber is provided in the middle of a slurry supply pipe or a slurry pouring pipe, when the slurry is transferred, while the slurry fed into the housing passes through the housing, Since the air mixed in the slurry is removed in the retention chamber, the quality of the slurry is stabilized and the surrounding water is prevented from becoming polluted.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, the symbol A indicates an underwater slurry casting device. This slurry submersible pouring device A has a slurry supply pipe 1 connected at one end to a slurry discharge pump or the like to transport the slurry under pressure, and a slurry supply pipe 1 connected to the other end of the slurry supply pipe 1 to transport the slurry. A slurry casting pipe 2 that drops vertically to the bottom of the water, and a float 3 attached to the second part of this slurry casting pipe 2.
and a cylindrical cover 4 attached to the tip of the slurry casting pipe 2 so as to surround the outer periphery of the slurry casting pipe 2.
and a support plate 5 which is disposed at the tip of the slurry casting pipe 2 in a state spaced apart from the discharge port of the slurry casting pipe 2 and lands on the bottom G of the water. Then, with the tip of the slurry pouring pipe 2 touching the bottom via the support plate 5,
The basic structure is that the slurry is fed into the slurry casting pipe 2 through the slurry supply pipe 1, and the slurry is cast onto the water bottom (or improved upper surface) G from the discharge port at the tip of the slurry casting pipe 2.

Next, to explain these main parts in detail, the slurry supply pipe 1 is configured to pump slurry from a slurry discharge pump to a slurry casting pipe 2 on a work boat IO equipped with a slurry supply section such as a discharge pump. In the illustrated example, a flexible tube is used.

The slurry casting pipe 2 drops the slurry pumped by the slurry supply pipe 1 to the casting position on the water bottom, and is composed of a vertical pipe extending from the water surface toward the water bottom. A part of the lower side of the slurry casting pipe 2 is formed by a flexible pipe 2a, and the slurry casting pipe 2
It is designed to absorb the shaking caused by waves on one side.

In addition, when changing the distance from the water surface to the water bottom of the slurry casting pipe 2, the number of vertical pipes connected in the vertical direction may be increased or decreased. Further, in order to improve the stability of the slurry casting pipe 2, it is preferable to suspend the slurry casting pipe 2 via a dedicated suspension frame installed on a ship, for example.

On the other hand, the float 3 attached to the top of the slurry casting pipe 2 provides a float J to the top of the slurry casting pipe 2 to maintain the verticality of the slurry casting pipe 2, and in the illustrated example, The inside of the slurry pouring pipe 2 is formed by a hollow cylindrical body.

The structure of this float 3 is not limited to that shown in the drawings, but is a means of maintaining the verticality of the slurry casting pipe 2 by applying buoyancy to the upper part of the slurry casting pipe 2. If so, other configurations may be used.

On the other hand, the cylindrical cover 4 provided at the lower part of the slurry casting pipe 2 is formed to have a dimension longer than at least the thickness of the slurry to be cast, so that when the slurry casting pipe 2 is pulled up after slurry casting, In addition, the support plate 5 is provided to prevent slurry from getting on it.

The support plate 5 provided at the tip of the slurry pouring pipe 2 and supporting it on the water bottom G will be explained. This has truncated conical slopes formed on both the front and back surfaces 5 a and 5 b.
Consideration has been taken to ensure stability when landing on the bottom and to prevent slurry from blowing up when discharging slurry. Further, the support plate 5 is held apart from the discharge port of the slurry casting pipe 2 by a pair of spacing members 11 protruding from the lower end of the cover 4.

The tip of the slurry casting pipe 2 may have a structure in which a cover 4 is simply disposed around the vertical pipe, but the dispensing port of the slurry casting pipe 2 may be provided with a cover 4, for example, as previously proposed by the present applicant. It is preferable to apply mutatis mutandis the technique disclosed in Japanese Patent Application No. 140783/1983 entitled "Slurry Underwater Casting Apparatus". That is, as shown in FIGS. 2 to 4, an air-driven valve 20 is provided near the tip of the slurry pouring pipe 2, and an annular guide plate 21 is provided at the tip of the valve 20.
Moreover, a cover 4 covering the slurry casting pipe 2 and the valve 20 is provided on the outer periphery of the slurry casting pipe 2, so that it has a double-tube structure.

The valve 20 includes a flanged casing 24;
It is composed of a rubber valve membrane 25 that forms the flow path of the cast pipe, and an air hose 26 is installed on the side of the casing 24.
is connected.

This air hose 26 is piped along the slurry pouring pipe 2 up to the surface of the water, and the other end is connected to a compressor via a switching valve or a pressure reducing valve. Note that there is a flange 27 for the boat between the slurry pouring pipe 2 and the cover 4.
A drain plug 2 is provided at the lower end of the cover 4.
8 is provided.

In the case of such a configuration, the slurry pouring operation is carried out from the air hose 26 to the casing 24 of the valve 20.
Slurry is supplied into the slurry casting pipe 2 with the valve 20 closed by feeding compressed air between the valve membrane 25 and the valve membrane 25. Next, the air in the valve 20 is removed through the air port 26, and the slurry is placed in water with the valve 20 in an open state. After pouring the slurry into water, supply compressed air into the valve while leaving a predetermined amount of slurry in the slurry pouring pipe (an amount that can prevent water from entering or backflowing into the slurry pouring pipe). Close the valve again.

When the tip of the slurry casting pipe 2 of the underwater casting apparatus A is configured as described above, the opening degree of the valve membrane 25 can be freely controlled by controlling the air pressure in the goose song 24 of the valve 20. Can be adjusted.

As a result, the remaining amount of slurry and the opening/closing of the valve 20 can be easily adjusted, a predetermined remaining amount of slurry can be secured in the slurry pouring pipe 2, and backflow of water into the pipe can be prevented. Therefore, it is possible to achieve high-quality slurry casting underwater. In addition, by opening and closing the valve 20, it is possible to prevent as much as possible the contamination of water caused by the relocation of the pouring device A and the contact of the initial slurry with water at the start of pouring.

Next, the operation of the slurry underwater casting apparatus of the embodiment configured as shown in FIG. 1 will be explained.

First, when pouring a slurry-like material such as concrete, mortar, or coal ash slurry on the pouring bottom surface G at the bottom of the water, as shown in Figure 1, pour the slurry into the slurry supply pipe l of the underwater pouring device A. The installation pipes 2 are connected, and the slurry casting pipe 2 is dropped into the water bottom G with a float 3 attached to its second part, and is arranged approximately perpendicular to the casting bottom surface G.

In this state, the slurry is fed into the slurry casting pipe 2 through the slurry supply pipe 1 by a slurry supply means (not shown), and the slurry is discharged from the discharge port at the tip of the slurry casting pipe 2, so that the discharge port always discharges the slurry. The slurry is placed on the bottom of the water while remaining buried in the slurry.

In the underwater slurry casting apparatus A of the embodiment, when the slurry casting pipe 2 is dropped into the water bottom, the support plate 5 attached to the tip of the slurry casting pipe 2 is moved to the water bottom (or the improvement where slurry has already been cast). The slurry casting pipe 2 is fixed in a state where it is supported on the water bottom G, and the float 3 provided at the top of the slurry casting pipe 2 is connected to the verticality of the slurry casting pipe 2. As a result, the discharge port at the tip of the slurry pouring pipe 2 always maintains a constant position, and as a result, the influence of ocean conditions such as waves, ocean currents, and tidal level fluctuations during pouring is reduced, and water This prevents turbidity and stabilizes the quality of the slurry.

Furthermore, in the embodiment, the -□ section of the slurry casting pipe 2 is constituted by the flexible tube 2a, and the slurry casting pipe 2 is connected to the slurry = 12- - supply pipe 1 made of a flexible tube. There is an advantage that the flexible tube 2a and the slurry supply pipe 1 each absorb the swinging of the slurry casting pipe 2 itself caused by waves, and the stability of the discharge port at the tip of the slurry casting pipe 2 is maintained.

Moreover, when paying attention to the state in which the slurry is cast, the slurry discharged from the discharge port of the slurry casting pipe 2 flows along the conical upper surface 5a of the support plate 5, and flows in the horizontal direction. Since the poured slurry is pushed out to
Therefore, less water is involved, preventing water from becoming cloudy and reducing the strength of the slurry, resulting in high-quality casting.

In addition, the new pouring slurry poured from the slurry pouring pipe 2 spreads the previously poured uncured slurry in the horizontal direction as shown by arrow A in Figure 1, so that the slurry being poured becomes slurry. It does not rise along the pouring pipe IO and cover the already poured slurry one after another, so the new slurry has less contact with water, and does not cause a decrease in density or strength of the slurry. Another advantage is that high-quality slurry can be poured.

5 and 6 respectively show another embodiment of an underwater slurry casting device, in which a housing 30 having a larger diameter than these pipes is installed in the middle of the slurry supply pipe 1 or the slurry casting pipe 2. By forming a retention chamber 31 in which the slurry is retained in the nib housing 30, and by providing the housing 30 with an air vent valve 33 that communicates with the air pocket 32 of the retention chamber 31, the quality of the slurry is further improved. Also, it is designed to prevent surrounding water from being contaminated by slurry pouring.

That is, in FIG. 5, slurry underwater casting device A
A housing 30 is flanged to the middle of the slurry supply pipe 1, and the housing 30 is provided with a supply port 30a connected to the supply pipe 1 on the slurry supply side at the upper left side of the housing 30. A slurry discharge port 30b is provided on the lower right side, and an air vent valve 3 is provided on the top surface.
3 is attached to the basic structure.

In this embodiment, as shown in the drawings, when the slurry supplied through the supply port 30a of the housing 30 passes through the retention chamber 31, its moving speed decreases.
At this time, the air mixed in the slurry is released into the air pocket 32 above the retention chamber 31, and the air is discharged through the air vent valve 33, so that the quality of the slurry supplied to the slurry casting pipe 2 is improved. It can stabilize the surrounding water and prevent it from becoming polluted.

Note that as the air vent valve 33, a pressure regulating valve or the like that opens when the pressure is higher than a set pressure is applied.

On the other hand, in FIG. 6, an underwater slurry casting apparatus A2 has a housing 30 directly connected to the slurry casting pipe 2, and the housing 30 has a body bulging outward. , Also, a supply port 30a is provided on the top surface of the supply port 30a.
Discharge ports 30b are respectively provided on the lower surface thereof, and further,
The basic structure is that an air vent valve 33 is attached to two sides of the body.

In this embodiment, as shown in the drawing, the slurry supplied from above the slurry pouring pipe 2 is retained in the retention chamber 31 of the housing 30, and its moving speed is reduced. , similar to the embodiment shown in FIG.
The air mixed in the slurry is released into the air pocket 32 formed above the retention chamber 31, and the air is discharged through the air vent valve 33, so that the quality of the slurry supplied to the slurry casting pipe 2 can be improved. It can stabilize the surrounding water and prevent it from becoming polluted.

"Effects of the Invention" As explained above, the underwater slurry casting apparatus according to the present invention provides the following excellent effects.

■ At the tip of the slurry casting pipe, a support plate that touches the bottom of the water and supports the slurry casting pipe is placed at a distance from the discharge port, and a float is attached to the top of the slurry casting pipe. The tip of the slurry casting pipe can be maintained in a stable state, thereby preventing deterioration in quality of the slurry and preventing contamination of surrounding water.

■ In addition, by making a part of the slurry casting pipe flexible, it is possible to absorb vibrations caused by waves above the slurry casting pipe, so slurry can be poured in a stable state, especially at the discharge port at the tip of the slurry casting pipe. Pouring can be done.

■ In addition, a housing with a larger diameter than these pipes is provided in the middle of the slurry supply pipe or slurry casting pipe, and a retention chamber for retaining the slurry is formed in the housing, and an air pocket in the retention chamber is formed in the housing. Since an air vent valve communicating with the slurry is provided, the air mixed in the slurry in the retention chamber of the housing can be removed, the quality of the slurry can be stabilized, and the surrounding water can be prevented from becoming contaminated.

[Brief explanation of the drawing]

The drawings are shown to explain the present invention in detail, and FIG. 1 is a schematic diagram of an underwater pouring device showing a state in which slurry is poured onto the bottom surface of the concrete in water, and FIGS. 2 to 4 are This shows an example of the tip of the slurry pouring pipe of the underwater pouring device.
The figure is a half sectional view, Figure 3 is a sectional view taken along the line 1-111 in Figure 2, Figure 4 is a sectional view taken along the line TV-IV in Figure 2, and Figures 5 and 6 are Each shows another embodiment of an underwater slurry pouring device; FIG. 5 is a cross-sectional view showing the housing connected to the slurry supply pipe, and FIG. 6 is a cross-sectional view showing the housing connected to the slurry pouring pipe. FIG. A: Underwater casting device, G: Underwater bottom, 1: Slurry supply pipe, 2: Slurry casting pipe, 2a: Flexible pipe, 3: Float, 4: Cylindrical cover, 5・・Support plate, 10・・・Work boat, 11・ Spacing member, 20・・Valve, 21・・・Guide plate, 24・・Casing, 25・Valve membrane, 26・・Air port, 30・- Housing, 31 - Retention chamber, 32... Air pool, 33 - Air vent valve.

Claims (1)

[Claims] 1) Slurry is fed through a slurry supply pipe to a slurry casting pipe having a discharge port near the bottom of the water, and is discharged from the discharge port toward the bottom of the water to cast the slurry on the bottom of the water. The slurry pouring device is an underwater pouring device for slurry pouring, in which a support plate that lands on the bottom of the water and supports the slurry pouring pipe is disposed at the tip of the slurry pouring pipe in a state that is spaced apart from the discharge port, and An underwater pouring device for slurry with a float attached to the top of the pouring pipe. 2) The underwater slurry casting apparatus according to claim 1, wherein a part of the slurry casting pipe is a flexible pipe. 3) Underwater casting of slurry in which the slurry is fed through a slurry supply pipe to a slurry casting pipe with a discharge port near the water bottom, and the slurry is discharged from the discharge port toward the water bottom to cast the slurry on the water bottom. In the apparatus, a housing having a larger diameter than these pipes is provided in the middle of the slurry supply pipe or the slurry casting pipe, and a retention chamber for retaining the slurry is formed in the housing, and a retention chamber is provided in the housing. An underwater slurry casting device equipped with an air vent valve that communicates with the air pocket.