JP4469048B2 - Tremy tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tremy tube used when a casting material, such as mortar, into which coarse aggregate is not mixed is poured into water.
[0002]
[Prior art]
Conventionally, when concrete, earth or sand, or kneaded material mixed with a solidified material is put into the bottom of the water and placed in the water bottom, in order to prevent the cast material from diffusing during dropping in water, FIG. A tremy tube 1 as shown is used.
[0003]
In this case, the air in the supply hose 2 is compressed when the casting material pumped by the supply hose 2 by the start of the dropping falls in the tremey pipe 1, and is blown out in the water at the same time as the start of the placement. Turbidity of water accompanying the rise occurs.
[0004]
Further, there are cases where the casting is interrupted due to a failure of the plant for supplying the casting material, and in this case, there is a problem that the air separated in the supply hose 2 causes the same turbidity of water as described above.
[0005]
In addition, for example, when this tremmy pipe is used for the repair work of an existing quay, the tremmy pipe is moved more frequently. In this case, the tremy pipe 1 is completely drained, but at this time it remains in the tremy pipe 1. The cast material that has fallen out of the bottom of the tremy tube 1 may contaminate the water surface.
[0006]
[Problems to be solved by the invention]
In the present invention, when the casting material is started to be placed in the water using a tremy tube, the air compressed in the supply hose is blown into the water, or the air separated in the supply hose when the placement of the casting material is interrupted. It does not blow out into the water and does not cause turbidity in the water, and further blocks the remaining cast material in the pipe to prevent the cast material remaining in the pipe from falling into the water when moving the tremy pipe. A tremy tube that can be operated remotely is provided.
[0007]
[Means for Solving the Problems]
The present invention automatically closes with vacuum pressure when the casting material is in a free-falling state within the pipe at the upper end of the tremmy pipe with a tapered pipe attached to the lower end of the straight pipe into which the casting material is poured into the water bottom, and A check valve for venting air that automatically opens to release air above atmospheric pressure in the pipe is provided, and a discharge hole for the casting material is provided on the side surface of the taper pipe, and the taper is tapered above the discharge hole of the taper pipe. A valve body that closes the pipe or straight pipe is attached, and the valve body consists of a tremy pipe that closes the taper pipe or straight pipe from the inside by supplying compressed air to the lower surface of the valve body. A valve that opens and closes by air pressure or fluid pressure is provided at the upper end of a tremmy pipe with a taper pipe attached to the lower end of the straight pipe into which the material is introduced, and a discharge hole for the casting material is provided on the side of the taper pipe. Position above the discharge hole of the pipe Mounting a valve body for closing the tapered tube or the straight pipe, the valve member by the supply of compressed air to the lower surface of the valve body is made of tremie tube to close the tapered tube or the straight pipe from the inside. In addition, in this case, the valve body is constituted by a flexible plate material that expands and contracts by packing and air injection and discharge, and the valve body is an invention that adopts a tremey tube constituted by a packing and an air spring.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the tremy tube of the present invention will be described below with reference to the drawings.
[0009]
FIG. 1 is a side view of a tremmy tube 1 of the embodiment, and FIG. 2 is a side sectional view of an essential part of the valve body at the bottom of the tremy tube 1 of FIG.
[0010]
In this tremmy pipe 1, a taper pipe 8 is attached to the lower end portion of the straight pipe 31, and the casting material is supplied to the tremy pipe 1 through a long elbow pipe 7 from a supply hose not shown.
[0011]
A check valve 6 for venting air is provided at the upper end portion of the tremmy pipe 1, and when the cast material left in the tremy pipe 1 is in a free fall state, the check valve is automatically set by the vacuum pressure. When 6 is closed and the air in the pipe is compressed by the start of the casting material, the check valve 6 is automatically opened so as to release the air above the atmospheric pressure in the pipe.
[0012]
Next, in the embodiment shown in FIG. 2, a plurality of slit-shaped casting material discharge holes 9 are provided on the side surface of the taper tube 8, and the lower end surface of the taper tube 8 expands by injecting and discharging air. A valve body 10 having a steel plate 33 attached is mounted on a flexible plate 32 made of a shrinkable rubber plate or the like, and includes the three-way cock 18, the pressure gauge 19, the compressed air tank 20, the pressure reducing valve 21 and the like of FIG. The right half of FIG. 2 is obtained by supplying compressed air A supplied from a compressed air source provided at a distant place on land or the like via a compressed air hose 12 from an air supply port 13 provided on the lower surface of the valve body 10. As shown in the left half, the valve body 10 is switched from the opened state to the valve closed state in which the tapered tube 8 is closed from the inside.
[0013]
Further, in this embodiment, the valve body is configured to block the tapered tube 9 above the discharge hole 9, but the straight tube 31 may be blocked.
[0014]
Next, FIG. 4 shows another embodiment of the valve body.
[0015]
The valve body 10 has a rubber packing 36 attached to the upper end portion of the air spring 35. The air spring 35 moves up and down by injecting and discharging air. Therefore, the valve body 10 is attached to the bottom of the taper tube 8, and a compressed air is injected and discharged at the bottom of the air spring 35, and the compressed air is injected and discharged, whereby the air spring 35 moves up and down. The tapered tube 8 above the hole 9 can be closed. Also in this case, the straight pipe 31 may be closed.
[0016]
When the casting material is placed on the bottom of the water using the thus configured tremy tube 1, and when the casting material remains in the tremy tube 1, the tremmy tube 1 is lifted and moved underwater. First, the taper tube 8 or the straight tube 31 is closed with the valve body 10, and then the tremy tube 1 is lifted. At this time, the casting material in the tremy tube 1 tries to fall freely, but the check valve 6 acts. Thus, a vacuum works in the tremy tube 1, and the placing material in the tremy tube 1 becomes difficult to fall freely, and the load acting on the valve body 10 is reduced.
[0017]
In the embodiments described so far, the check valve 6 is used. However, instead of the check valve 6, a valve that opens and closes by air pressure or fluid pressure is provided, and when the placement material is placed, the valve is opened. When the tremy tube 1 is moved, the same action as the check valve 6 can be obtained by closing the valve.
[0018]
In addition, the tremy tube 1 of the present invention is not suitable for in-water injection of a cast material mixed with coarse aggregate such as concrete material, and is not cast with coarse aggregate such as mortar. It can be applied particularly effectively to the introduction of water into water.
[0019]
【The invention's effect】
According to the above-described tremy tube of the present invention, excess compressed air is released to the atmosphere by the valve provided at the upper end, so that it is possible to prevent contamination by compressed air when placing. At the same time, when moving the tremmy pipe, the valve is closed and the cast material remaining in the tremy pipe is hard to fall freely in the tremy pipe due to the vacuum effect, so the load on the valve body can be reduced, The structure of the valve body can be simplified.
[0020]
Moreover, since the valve body can be easily opened and closed by compressed air, remote operation is possible, and safety is improved.
[Brief description of the drawings]
FIG. 1 is a side view of an embodiment of a tremy tube of the present invention.
2 is a side cross-sectional view of a principal part for explaining the function of the valve body at the bottom of the tremmy tube of FIG. 1;
FIG. 3 is a layout view of an example of a compressed air source used for closing the valve body at the bottom of the tremmy tube of FIG. 2;
FIG. 4 is a side view of a main part fracture for explaining the function of the valve body at the bottom in another embodiment of the tremy tube of the present invention.
FIG. 5 is a side view showing a conventional tremy tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tremy pipe 6 Check valve 8 Taper pipe 9 Discharge hole 10 Valve body A Compressed air 31 Straight pipe 32 Flexible board 33, 36 Packing 35 Air spring

Claims (4)

At the top end of a tremmy pipe with a taper pipe attached to the bottom end of the straight pipe that puts the casting material into the bottom of the water, when the casting material falls freely into the pipe, it automatically closes with vacuum pressure and the atmospheric pressure inside the pipe A check valve for venting air that automatically opens to release the above air is provided, and a discharge hole for the casting material is provided on the side surface of the taper pipe, and the taper pipe or straight pipe is positioned above the discharge hole of the taper pipe. A toremy tube in which a valve body is attached so that the valve body closes the taper pipe or straight pipe from the inside by supplying compressed air to the lower surface of the valve body. A valve that opens and closes by air pressure or fluid pressure is provided at the upper end of the tremmy pipe with a tapered pipe attached to the lower end of the straight pipe to which the casting material is poured into the bottom of the water. Install a valve body that closes the taper pipe or straight pipe at a position above the discharge hole of the taper pipe so that the valve body closes the taper pipe or straight pipe from the inside by supplying compressed air to the lower surface of the valve body Tremy tube. The treme tube according to claim 1 or 2, wherein the valve body is composed of a flexible plate material that expands and contracts by packing and air injection / discharge. The tremy tube according to claim 1 or 2, wherein the valve body includes a packing and an air spring.

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