JPH0521561Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This application relates to a sand pipe of a dredging device that sucks earth and sand from the bottom of water such as oceans, rivers, and dam lakes and lifts the earth above the water surface. .

[Prior Art] Fig. 4 shows an example of a dredger used for large-scale dredging work.

To explain the general structure, when a long cylindrical body 1a that opens at one end of the hull 15 is mounted in the longitudinal direction of the hull and arrives at the destination under its own power (or by someone else's power),
The wire ropes connected to key points of the cylindrical body through the pulleys of the deretsuki 16 are loosened as appropriate to allow the cylindrical body 1a to hang down as shown in the figure. A suction port 18 is attached to the tip of the cylindrical body for suctioning earth and sand from the bottom of the water, and a sand pump 19 for generating suction force is attached above the suction port 18. When the pump operates, it sucks sediment from the bottom of the water through the suction port, rises inside the cylindrical body, reaches the ship, and after sorting, discharges it into a sand storage tank (hold) 20 on the ship. In some cases, the sand is passed on to a sand pipe built above the water surface and directly pumped to land.

Submerged sand conveying pipes do not reach the bottom smoothly unless they have appropriate flexibility, so rubber hoses are used for some or all of them, but for reinforcement, steel pipes 4a and rubber hoses 2a are usually combined to provide flexibility. It is designed to maintain both the retention and durability of the product.

[Problems to be solved by the invention] Since the above-mentioned rubber hose has earth and sand passing through its interior, it has a specially designed structure to withstand the load and abrasion.For example, it has a rubber layer, thick woven canvas, Adhesive rubber, hard steel wire, adhesive rubber, thick woven canvas,
A product made of hard steel wire and rubber layers is used.

Even when such specially made rubber hoses are used, troubles often occur due to the following reasons. That is, the long cylindrical body is connected to wire ropes 17 at several locations, and each wire rope is wound around a winch provided on the device via a Derecki pulley. Since each wire rope connection point has a different depth from the water surface, it is not possible to move up and down the suction port smoothly without unwinding or winding the wire rope according to the water depth using a winch operation. Since it is not possible to see the water depth at each location from the top of the equipment,
You probably have to rely on experience and intuition.

Additionally, as the bottom of the water is excavated, the position of the suction port must be lowered by that amount, which also requires experienced winch operation. If these winch operations are not performed properly, the rubber hose will bend in the water, and it will be difficult to correct the bend since it is impossible to see where the bend is from above the equipment. As a result, when earth and sand pass through the pipe, the pipe undergoes intensive abrasion and wear, resulting in significant wear and tear, and in extreme cases, perforation or rupture.

Next, even if the cylindrical body is raised and lowered correctly, the rubber hose may bend due to the influence of underwater currents, and when the wave height near the water surface is large and the equipment (ship) swings on the water surface, The suction port moves up and down, giving a severe impact to the rubber hose and causing it to break.

To prevent this, a steel protective tube is sometimes attached to the outside of the rubber hose (see Figures 4 and 5).
Figure) If this protection tube is used too much, the cylindrical body will lose its flexibility, making it difficult to move up and down smoothly, and the exposed rubber part between the protection tubes will be subject to concentrated bending stress, which may lead to premature damage. susceptible to wear and tear.

Further, as a conventional technique for solving such problems, there is also the technique disclosed in Japanese Utility Model Publication No. 39-30170. As shown in FIG. 6, the periphery of both ends of a metal ring body 101 having an inner circumferential groove 102 is bent inward to form an engaging portion 103, and an engaging portion 104 that engages with this engaging portion 103. A metal ring body 105 having on both sides peripheries
are arbitrarily arranged in a row so that both ring bodies can be bent and extended by moving the engaging portions into contact and separation.Also, a T-shaped ring body 107 is provided inside the ring body 101, and the tip of the vertical wall is connected to the ring body. The tubes 109 are inserted into the inner circumferential groove 102 of the body to prevent the ring bodies 107 from shaking, and a tube 109 is installed inside each ring body to form a conduit for dredging. but,
In this case as well, the rubber hose 109 is completely surrounded by the rigid metal rings 107 and 106 on the same plane on its outer peripheral surface, except for the interval C in the figure. and 1
04 can be moved into and out of contact with each other, the flexibility inherent in rubber that is actually permissible is only exhibited within a length range corresponding to the distance C.
In most other areas, the entire outer circumferential surface is firmly restrained by the metal ring, and the room for flexibility is limited to a very small amount, so it is difficult to reduce flexibility when dredging. If we interpret this as an important requirement, it must be said that major issues remain.

In order to solve the above-mentioned problems, the present invention aims to provide a new sand conveying pipe for a dredging device that completely protects the outside of the rubber hose part and still maintains the flexibility of the rubber hose.

[Means for Solving the Problems] The sand feeding pipe of the dredging device according to the present invention has two flanges attached to each end of the cylinder on the outer periphery of a flexible rubber hose that forms part or all of the sand feeding pipe. The inner cylinders are lined up and protruded toward the outer periphery, and the inner cylinders are installed at a desired distance apart, and one piece of flange is slidably inserted between the flange at each end of the inner cylinder on the inner periphery of both ends. The above-mentioned problem was solved by connecting and fitting the inner cylinders with an outer cylinder that protrudes from the outer cylinder, and surrounding the entire length of the rubber hose by the fitting of the inner cylinder and the outer cylinder. Furthermore, in a highly preferred embodiment, the collar of the outer cylinder that fits between the collars of the inner cylinder is a hollow tube that maximizes the expansion and contraction of the rubber within the permissible radius of curvature of the rubber hose corresponding to the length of the inner cylinder. Examples include those that fit loosely through.

[Function] Since the sand pipe of the dredging device according to the present invention has the above-mentioned configuration, in the process of suspending the cylindrical body using the hanging means on the device and lowering the suction port into the water, there is no possibility of misoperation of the winch. Even if the cylindrical body were to bend in the middle, the multiple protective tubes that loosely fit around the outer circumference of the flexible rubber hose would slide against each other and fluctuate in line with this external force. However, if it fluctuates by the amount of the loosely fitted hole, it will no longer be able to move due to its rigidity, and the bending stress will be absorbed by the rigidity of this protective tube. Therefore,
While the sand pipe maintains an allowable flexibility when loosely fitted, the entire outer periphery of the rubber hose is surrounded by a protective tube with excellent physical properties to prevent the rubber hose from bending that could cause abnormal wear or premature breakage. Produces a blocking effect.

[Example] An example of the present invention will be described based on FIG. 1, FIGS. 2A and B, and FIG. 3.

FIG. 1 shows an elongated cylindrical body 1 which is a sand conveying pipe according to the present invention, and a conduit is formed by alternately connecting rubber hoses 2 and steel pipes 4 which are connected by bolts via insertion joints 3. An inner tube 5 and an outer tube 6 are slidably fitted around the outer periphery of the rubber hose 2.

In practical terms, both are created by splitting each in half, and the inner cylinder is placed on top of the rubber hose, the split surface is tightened with bolts and nuts to hold the rubber hose, and the outer cylinder is placed over the inner cylinder, and the split surface is tightened with bolts and nuts. Tighten and fit loosely so that it can slide.

Figure 2 A and B show the inner cylinder 5 and outer cylinder 6 in the embodiment.
There are two tsuba 7 on each end of the inner cylinder.
8, 9, and 10 are protruded, and between the tsuba and the tsuba,
Inwardly protruding flanges 11 and 12 are inserted into both ends of the outer cylinder, respectively. The space C created by the insertion of the flanges of the inner and outer cylinders is the allowable range of movement of the outer cylinder relative to the inner cylinder. When setting this air value C, it is preferable to calculate it from the physical property values of the flexible rubber hose to obtain a preferable result.

In this example, the standard length of a rubber hose with an inner diameter of 560 mmφ and an outer diameter of 700 mmφ is 4500 mm, but since the insertion joints 3 are inserted 500 mm from the front and rear ends, the length of the rubber hose that is subjected to bending stress is 3400 mm. It is. Due to the material of this rubber hose, the manufacturer's guaranteed allowable radius of curvature is 5,600 mm, which is 10 times the inner diameter.
R, and when this is drawn, the extended arc length is 3512 mml and the contracted arc length is 3188 mm as shown in Figure 3.
1, and in order to absorb this difference in expansion and contraction using 7 inner diameter tubes and 6 outer tube tubes, the empty space C at one point must be 30
Just set it as mm.

In addition, the inner cylinder corresponding to both ends of the rubber hose section facing the insertion joint 3 has chains 13, 1 as shown in FIG.
4 is attached and connected to the steel pipe 4 and the insertion joint 3 to prevent it from falling off.

[Effects of the invention] Since the sand conveying pipe according to the invention of the present application has the configuration and function described above, it can be easily removed even if bending stress is exerted due to unbalanced suspension operation when the sand pipe is sinking in water as an integral cylindrical body. The cylinder slides against the inner cylinder to form a bend up to a certain limit, but since it supports and prevents further bending, the pipe can bend abnormally and cause abnormal wear and tear in that part. Finally, there was no longer any risk of destroying the pipeline.

In addition, as an effect unique to the embodiment, the bending of the rubber hose formed by the relative sliding of the inner and outer cylinders is limited to the maximum allowable radius of curvature for the material of the hose, so the physical property value It can be said that the rubber hose will never be damaged by exceeding the limit.

Furthermore, compared to the prior art shown in FIG. 6, in the present invention, the inner cylinder and the outer cylinder 6 are fitted together so as not to come apart due to the loose fitting between the flanges, but unlike the prior art, The configuration does not constrain the outer peripheral surface of the rubber hose almost all the way to the front. The inner cylinder is fixed to the outer circumferential surface of the rubber hose to protect it from internal and external pressure, but the outer cylinder is not in any direct engagement with the rubber hose, and completely over this wide range (distance L in Figure 2 A). A unique design that maintains an open free surface, exhibits the necessary flexibility to absorb external forces, and reliably protects against external forces that exceed the limits by the rigidity of the inner and outer cylinders. There is a major difference in discovering the effects. It is precisely because of this structure that maintains such good flexibility that the idea of creating an air space between the brim that limits the expansion and contraction of the rubber within the permissible radius of curvature of the rubber hose comes into play. If most of the outer periphery is tightly covered with a metal ring as in the technology, there is no need to question the flexibility or physical properties of the rubber itself.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the embodiment of the present application, Fig. 2A is a partial front sectional view showing details of the inner cylinder 5 and outer cylinder 6, Fig. 2B is a side view of the same state, and Fig. 3 4 is a perspective view showing the conventional technique, and 5 is a conventional cylindrical body 1.
FIG. 6 is a partial perspective view of FIG. 1... Cylindrical body, 2... Rubber hose, 5... Inner cylinder, 6... Outer cylinder, 7, 8, 9, 10... Tsuba (inner cylinder side), 11, 12... Tsuba (outer cylinder side) ,C...empty〓.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a sand pipe of a dredging device that hangs a long cylindrical body from above the water surface to reach near the water bottom, sucks up sediment from the water bottom and lifts the soil above the water surface. An inner tube with two flanges lined up on each end of the tube and protruding toward the outer circumference is attached to the outer periphery of a flexible rubber hose that forms part or all of the tube at a desired distance from both ends of the inner tube. The inner cylinders are connected and fitted together with an outer cylinder, each of which has a single flang that protrudes toward the inner periphery at both ends and is slidably fitted between the flanges of each of the flanges. A sand feeding pipe for a dredging device, characterized in that the fitting surrounds the entire length of a rubber hose. (2) The collar of the outer cylinder that fits between the collars of the inner cylinder fits loosely through a gap that maximizes the expansion and contraction of the rubber within the permissible radius of curvature of the rubber hose corresponding to the length of the inner cylinder. A sand pipe for a dredging device according to claim 1 of the utility model registration claim.