JPS60497B2 - Underwater concrete construction equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an underwater concrete construction device, and in particular,
The discharge port of the concrete flow down pipe is adapted to adjust the amount of concrete flowing down, and the closed area of the discharge port can be adjusted by the position of the opening of the inner cylinder pipe, which has an opening enclosed in the outer cylinder pipe. If concrete aggregate is pinched at the edge of the spout formed between the outer tube and the inner tube, resulting in poor closure, repeated reciprocating rotation of the inner tube will remove the pinched aggregate. so that the outlet can be completely closed.

In general, underwater concrete construction employs various construction methods such as bagged concrete, open-bottom containers, and tremie, depending on construction conditions such as the amount of concrete to be placed, water depth, and other factors such as the importance of the structure.

Therefore, the most important thing in the construction of underwater concrete is to minimize the contact between concrete and water and to prevent the separation of concrete aggregates.
In recent years, with the progress of ocean development, the demand for underwater concrete construction such as the construction of underwater structures has been increasing, and the scale has also become larger, and the tremie method has been developed as a method that satisfies the above requirements for underwater concrete construction. has become widely adopted, and in addition to the conventional method using a steel concrete flow pipe, a tremie method using a drop hose such as KDT or Hydro Valve has also been developed. However, the latter method has problems with construction accuracy because the equipment is complex and requires skill to operate, and the former method uses a bottom cover type as a means to prevent water from entering from the outlet of the concrete flow pipe. Although various devices such as plunger type and open/close lid type are used, not only do they require a considerable amount of skill to install and operate the concrete flow, but when installing concrete flow pipes, it is necessary to The pipe may float up, and even when pouring concrete, it is not possible to freely adjust the amount of concrete flowing down, so it is necessary to stop the pouring while the concrete remains in the pipe. There are problems with the speed of work because the flow pipe must be moved to another location, or the flow volume cannot be adjusted flexibly in response to the construction volume. Ta. Furthermore, since the structure of the connection part of the downflow pipe is generally complicated, it requires a great deal of labor and time to connect and remove it, and there is a drawback that construction efficiency is hindered in areas with large water depths.

Therefore, tremie pipes that can control the discharge of concrete have been provided in the past (Tokukan Sho 53-12).
6406), in which a float is moved up and down at the outlet of a tremie tube by air pressure, and the open/closed state of the outlet is adjusted.

However, with this method, concrete aggregate may get caught between the green outlet and the edge of the float, which may impede the operation of the float. In order to release the aggregate, it is sufficient to vibrate the float back and forth several times, but this operation is difficult depending on the type of vessel.

Therefore, such a tremie tube is difficult to implement in practice.

This invention solves the problems of conventional underwater concrete construction methods and equipment using steel concrete flow pipes.

SUMMARY OF THE INVENTION An object of the present invention is to provide a closing part that can freely adjust the amount of closure at the lower end of a concrete flow pipe, and to provide a watertight and detachable joint at the connection part of the flow pipe, so that the inside of the flow pipe can be closed. It is an object of the present invention to provide an underwater concrete construction device that can prevent water from coming into contact with concrete by a simple operation by blocking water from entering the concrete. The purpose of this invention is to provide a device capable of
It is therefore an object of the present invention to provide a device that can easily remove entangled concrete aggregates and enable formal operation.A further object of the present invention is to stop the concrete from flowing down the flow pipe while retaining it in the flow pipe. It is an object of the present invention to provide a device suitable for moving the installation position of a pipe, and a further object of the present invention is to provide a device that does not cause the downstream pipe to float when installing the downstream pipe. The purpose of the invention is to provide a device that connects downflow pipes with simple operation, and a further purpose of the invention is to quickly perform construction regardless of the construction volume or water depth. A further object of the present invention is to provide a device that has a simple structure, is inexpensive, and can improve the precision and efficiency of construction.

That is, for example, as in the illustrated embodiment, the present invention provides a steel pipe 1 having a watertight and detachable connecting part 3 at one end, and a concrete outlet 4 at the end of the pipe. has a diameter larger than the diameter, and both end surfaces 9a,
9b protrudes from the outer periphery of the steel pipe 1 and is sealed, the outer cylindrical pipe 5 is joined to the outer periphery of the steel pipe 1 so that its central axis 6 is perpendicular to the central axis 7 of the steel pipe 1, and both end surfaces 10a , 10b protrude from the outer periphery of the steel pipe 1 and are sealed, and are inscribed in the outer cylindrical tube 5 and rotatably iron-coupled, and the inscribed surface 11 of the inner cylindrical tube 8 has: Opening 12,1 having a width at least equal to the cross-sectional area of the steel pipe 1
2 are opened so as to face each other, and the entrance area of the closing part 12 can be freely adjusted by rotating the inner cylindrical pipe 8. Next, an underwater concrete construction apparatus according to the present invention will be explained with reference to the drawings.

Figures 1 and 2 show a concrete flow rate adjusting device A of the present invention, in which the upper end of an inner cylindrical steel pipe 1 has a connection that is detachably connected to a concrete flow pipe 2 while maintaining watertightness. A section 3 is formed, the lower end of which becomes a concrete outlet 4. An outer cylindrical pipe 5 near the lower end of the steel pipe 1 and having a diameter larger than the outer diameter of the steel pipe 1 is joined to the outer periphery of the steel pipe 1 such that its central axis 6 is orthogonal to the central axis 7 of the steel pipe 1. An inner cylindrical tube 8 is inscribed in the outer cylindrical tube 5 and slidably fitted thereto. The lengths of the outer cylindrical tube 5 and the inner cylindrical tube 8 in the direction of the central axis 6 are each larger than the diameter of the steel tube 1, and both end surfaces 9a, 9b;
It protrudes from the outer periphery and is sealed. In the illustrated example, the length of the inner tube 8 is shorter than the outer tube 5, but contrary to this example, the length of the inner tube may be made longer than the outer tube. The inscribed surface 11 of the inner cylindrical tube 8 inscribed in the outer cylindrical tube 5 has closed portions 12, 12 separated by intersecting with the inner peripheral surface of the steel tube 1.
are located in positions facing each other. The openings 12, 12
Although the size can be increased or decreased arbitrarily, it is desirable that it be at least equal to the cross-sectional area of the steel pipe 1. Therefore, when determining the ratio of the diameters of the outer cylindrical pipe 5 and the inner cylindrical pipe 8 to the diameter of the steel pipe 1, it is necessary to make sure that the center line of the openings 12, 12 is orthogonal to the central axis of the steel pipe 1, and When the □ parts 12, 12 are in contact with the inner peripheral surface of the outer tube 5, the closed parts 12, 12 are closed, and the center lines of the open parts 12, 12 are aligned with the central axis of the steel pipe 1. When the opening is closed, the closing portions 12, 12 are appropriately set so as to be open. Moreover, both end surfaces 10a of the inner cylindrical tube 8
, 10b each have a chain date roller 13.
, 13 are fixedly attached to the rollers 13, and endless chains 14, 14 are stretched around the rollers 13, 13 so that they can be rotated by a prime mover (not shown).

Therefore, the inner tube 8 is connected to the outer tube 5 via the rollers 13, 13.
By rotating with the help of
You can open/close and adjust the amount of opening. 15,15
is a removable tube (for example, made of polyethylene or vinyl) installed in the insertion holes 16, 16 of the chains 14, 14 provided in the outer cylindrical tube 5, and houses the chains 14, 14; 16,16 to chain 14,14
Concrete is prevented from penetrating between the outer cylindrical pipe 5 and the inner cylindrical pipe 8 along the pipe.

The rotation mechanism for the inner tube 8 is not limited to the chain drive described above, and a drive device such as a hydraulic motor may also be used.

A connecting portion 3 is formed at the upper end of the steel pipe 1 to be connected to a concrete downflow pipe 2 through a detachable joint while maintaining water tightness.

As shown in FIG. 3, the connecting portion 3 consists of an annular groove 20a and a flange 21a connected to the annular groove 20a, and a similar annular groove 20b and flange 21b are provided at both ends of the concrete flow pipe 2. A removable joint 23 is used to connect the steel pipe 1 and the concrete downflow pipe 2 via a waterproof sheet 22 made of an elastic material such as rubber. As shown in FIGS. 3 to 6, the joint 23 is a combination of two curved steel plates each having an inner radius larger than the outer radius of the steel pipe 1. The upper and lower ends are thick, and the upper and lower ends are flat and provided with notches 24 at regular intervals.The upper and lower ends are bent outward to form an annular hole 25, and a steel wire 26 is inserted into the annular hole 25. Insert,
Hooks 27, 27 are provided at both ends of the steel wire 26, and a pair of joints 23 are brought into contact with the outer periphery of the sheet 22.
The annular holes 25 at the upper and lower ends of 3 are aligned with the annular grooves 20a and 20b of the steel pipe 1 and the concrete flow pipe 2, respectively, and the leaf springs 28 are driven into the hooks 27 of the steel wires 26 on both sides to tighten them. It has become. The leaf spring 28 has a plurality of protrusions 29 provided on the inner surface of a U-shaped groove, and the hook 27 of the steel wire 26 is clamped between the protrusions 29. The joint 23 is used not only to connect the steel pipe 1 equipped with the concrete flow rate adjusting device A and the concrete flow pipe 2, but also to connect the concrete flow pipes 2 to each other, and is used to connect the concrete flow pipe 2 to each other. A funnel-shaped concrete inlet 17 is provided at the upper end of 2a.

Figures 7 and 8 are examples of elliptical concrete flow pipes.

The underwater concrete construction equipment having the above configuration connects the required number of concrete flow pipes 2 with joints 23 according to the water depth of the underwater concrete construction location, and the lower end of the lowest concrete flow pipe is equipped with a concrete flow rate adjustment device. A is connected by a joint 23 and assembled, and when installing the device at a concrete pouring location, the chain/ditch rollers 13, 13 are driven to close the opening 12 of the inner cylindrical pipe 8.
, 12 are respectively inscribed in the inner peripheral surface of the outer cylindrical tube 5 by rotating the inner cylindrical tube 8 to close the entrance portions 12, 12,
After pouring a certain amount of concrete from the concrete input port 17 and storing it in the concrete flow pipe, the concrete construction device is lowered so that the concrete discharge port 4 reaches a predetermined water depth.

Next, the inner sleeve 8 is rotated so that the center line of the openings 12, 12 coincides with the center axis of the steel pipe 1, and the opening parts 12, 1 are opened.
2 is opened, and the concrete stored in the concrete flow pipe is allowed to flow down from the concrete discharge port 4. Subsequently, the operation of pouring concrete from the concrete input port 17 is repeated, and when a predetermined amount of concrete has been poured, the inner cylinder pipe 8 is rotated to close the entrance part and "stop concrete pouring at the relevant installation location." , the concrete downflow pipe is pulled up and moved to another location.As mentioned above, according to the device of the present invention, the concrete downflow pipe is lowered or pulled up by closing the opening of the inner cylindrical pipe. It is possible to prevent contact between concrete and water with a simple operation, and it is possible to close the closing part and stop concrete pouring while the concrete remains in the concrete flow pipe. Not only this, but also the downflow pipe can be moved to another installation location, and there is no possibility that the downflow pipe will float up when it is lowered.

In addition, by adjusting the amount of closure of the closing part of the inner tube,
The amount of concrete poured can be adjusted as needed, and since the device is connected to the downflow pipe and the downflow pipes are connected to each other by removable joints, it is possible to adjust the amount of concrete poured. This has the advantage of increasing construction accuracy and efficiency regardless of the depth of the water. When the concrete aggregate is caught in the discharge port, the inner tube can be rotated reciprocally to remove the concrete aggregate, thereby preventing work from being stopped due to the aggregate being caught.

[Brief explanation of drawings]

1 and 2 are a vertical side view and a vertical sectional view, respectively, of an embodiment of the device of the present invention, FIGS. 3 to 6 are explanatory views of the joint of the present invention, and FIGS. 7 and 8. 2A and 2B are a side view and a plan view, respectively, of another embodiment of the present invention. In the figure, A is a concrete flow rate adjustment device, 2 is a concrete flow pipe, 3 is a connection part, 4 is a concrete discharge port, 5
1 is an outer cylindrical pipe, 8 is an inner cylindrical pipe, 12 is a gate, 14 is a chain, 17 is a concrete input port, and 23 is a joint. Figure 3 Figure 4 Figure 1 Figure 2 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1 Forming a detachable connection part that maintains watertightness at one end,
A steel pipe having a concrete discharge port at the other end is provided with an outer cylindrical pipe having a diameter larger than the outer diameter of the steel pipe and both end surfaces protruding to the outer periphery of the steel pipe and sealed. An inner cylindrical tube that is joined to the outer periphery of the steel pipe so as to be orthogonal to the central axis of the steel pipe and that is sealed with both end surfaces protruding from the outer periphery of the steel tube is inscribed in and rotatably fitted to the outer cylindrical tube. An opening having a width at least equal to the cross-sectional area of the steel pipe is formed in the inscribed surface of the inner cylindrical pipe so as to face each other, and by rotating the inner cylindrical pipe, the opening can be opened. An underwater concrete flow rate adjustment device characterized by being able to freely adjust the opening area.