JP3150811B2 - Spraying sand on soft ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil covering method for spraying high-quality sand to improve the surface of a very soft ground.

[0002]

2. Description of the Related Art For example, when soft soil deposited on the seabed is dredged by a pump dredger and put into a landfill, the soft soil is disturbed during the construction process of the dredged landfill and further softens, resulting in very soft ground. It is formed. When spraying sand to improve such ultra-soft ground, first lay a surface covering material such as nets and sheets, and then use a water pumping method using a small pump ship, or a truck and bulldozer. Sand is discharged by a direct spreading method using a combination of a jet conveyor and a belt conveyor.

However, the water transport system has a problem that water pollution is apt to occur due to turbid water. In the case of a combination of a transport vehicle and a bulldozer, the ground pressure is large and the ground must be relatively good to withstand the weight of the machine. Construction is difficult.

[0004] In the direct-feeding method using a jet conveyor, a hopper is installed on an embankment or the like near the ultra-soft ground, and only the jet conveyor is arranged on the ultra-soft ground and moved linearly. A number of belt conveyors with a length of 5 to 7 m are connected from the hopper to the jet conveyor to supply sand, and when unwinding is completed, the jet conveyor is moved to the next spraying position and the belt conveyor is extended accordingly. Like that. In this case, because the ground strength is low, it is impossible to transport the extension belt conveyor to the end of the belt by a civil engineering machine. The connection required time, and as a result, the actual operation time was reduced, the operation rate of the jet conveyor was reduced, and this was a major factor in reducing the efficiency of the entire operation.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to pay attention to the above-mentioned problems and to make it possible to efficiently perform a sand spraying operation on an extremely soft ground.

[0006]

Means for Solving the Problems In order to achieve the above-mentioned object, a method for spraying sand on soft ground according to the present invention is to disperse sand on soft ground by a jet conveyor for projecting sand to a distant place, The supply of the sand supplied to the jet conveyer is performed by a transport vehicle that runs on a carry-in path formed by laying a thick block-shaped styrofoam plate on a portion where sand has been sprayed. Also, the sand supplied to the hopper by the transport vehicle is continuously sent out to the screw conveyor, the sand supplied by the screw conveyor is supplied to the jet conveyor by the belt conveyor, and the sand is sprayed on the soft ground by the jet conveyor. I have to.

[0007]

[Function] Since sand is projected far away by the jet conveyor, it is safer to work and move machinery on soft ground than directly laying with a bulldozer, and transport vehicles are made of Styrofoam plates. Since the vehicle travels on the road, the ground contact pressure against the ground is small, and safe traveling is ensured even on soft ground. In addition, since the Styrofoam plate is lightweight, it is easy to install and remove the carry-in path. In addition, since the screw conveyor is provided next to the hopper to which the sand is supplied by the transport vehicle, a fixed amount of sand can be continuously supplied to the jet conveyor, and the thickness of the sprayed sand is made uniform. It becomes easier.

[0008]

Next, one embodiment shown in the drawings will be described. FIG. 1 is a side view of a main part showing a construction state, FIG. 2 is a side view of the whole, and FIG.

In the figure, 1 is a hopper, 2 is a screw conveyor, 3 is a belt conveyor, and 4 is a jet conveyor. Sand 5a continuously supplied to the hopper 1 is a screw conveyor 2 and a belt conveyor 3. The work units 6 are connected to each other in an arrangement maintaining a predetermined relationship so as to be supplied to the jet conveyor 4 through the work unit 6. The hopper 1 and each conveyor 2,
Conventionally known structures can be adopted as the structures of the members 3 and 4 themselves. The jet conveyor 4 is mounted on a carrier 4b provided with a crawler 4a, and is installed on, for example, a swivel that can rotate 90 degrees to the right and left so that the sand 5b can be projected up to a distance of 20 m within a range of 180 degrees. The hopper 1 is pulled by the other conveyors 2, 3 and the carrier 4b so that it can run on its own.

Reference numeral 7 denotes a crawler 7a and a dump-type carrier 7b.
, 8 is a carry-in path, 9 is a backhoe on the embankment 10. The transport vehicle 7 reciprocates on the carry-in path 8 and supplies the sand 5a loaded by the backhoe 9 to the hopper 1. The carry-in path 8 has a thick block-like shape on the sand 5c scattered by the jet conveyor 4. The styrofoam plate 8a is laid without gaps. As the Styrofoam plate 8a, for example, one having a size of 2.7 × 0.9 m and a thickness of 0.4 m is used.

The operation of spraying sand is performed in the following procedure. First, after laying the net 11 on the target ground G, the sand temporarily placed on the embankment 10 or the like is loaded on the transport vehicle 7 by the backhoe 9 and put into the hopper 1. In addition,
Sand can be directly injected into the hopper 1 with the backhoe 9 without using the carrier 7 at a point near the embankment 10. The screw conveyor 2 supplies a fixed amount of sand to the belt conveyor 3 while keeping the rotation speed constant,
The sand conveyed by the belt conveyor 3 is put into a hopper 4c of the jet conveyor 4, and is projected by the jet conveyor 4 to a distant target point. The sand 5b is unwound in an arc shape as shown in FIG. 3 while turning the jet conveyor 4, and the work at that point is performed when the thickness of the sand 5c on the net 11 reaches a predetermined value, for example, 0.5 m. Is completed,
The carrier 4b is driven to move the working unit 6 to the next point by one pitch, for example, 5 m.

The carry-in path 8 is formed between the work unit 6 and the embankment 10, and is extended sequentially according to the movement of the work unit 6. That is, after the operation unit 6 is moved, the styrofoam plate 8a is transported to the tip of the import path 8 by human power or using a small civil engineering machine, and is spread to a position where it reaches the hopper 1 of the operation unit 6, and the import path 8 is moved. Will be extended. Hereinafter, sand is extracted while repeating the same procedure, so that the operation unit 6 can be easily moved and the carry-in path 8 can be easily extended, work can be efficiently performed, and safety can be improved.

In order to smoothly supply the sand 5a from the hopper 1 to the screw conveyor 2, it is desirable that the sand 5a be piled up on the discharge port at the bottom of the hopper 1. 12
Is a mini-backhoe used as needed for this purpose. As shown in FIG. 3, the mini-backhoe is placed on a work table 13 made of styrene foam provided beside the hopper 1, and the sand 5a is piled up in an appropriate shape. The mini backhoe 12 is operated in such a manner.

[0014]

As is apparent from the above embodiment, the present invention scatters sand on soft ground by a jet conveyor for projecting sand to a distant place, and replenishes the sand supplied to the jet conveyor with sand. This is performed by a transport vehicle that runs on a carry-in path formed by laying a styrofoam plate on a portion where spraying has been completed. Therefore, compared to direct laying with a bulldozer, work on soft ground and replenishment of sand are easier and safer, and it is easier to move from the point where work was completed to the next point, and the jet conveyor It is possible to improve the operation rate and efficiently proceed with the entire work.

[0015] Further, by feeding the sand supplied to the hopper by the transporter with a screw conveyor, a fixed amount of sand can be continuously supplied to the jet conveyor, and the thickness of the sprayed sand is made uniform. It becomes easier.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing a construction state according to an embodiment of the present invention.

FIG. 2 is an overall side view showing a construction state of the embodiment.

FIG. 3 is a plan view of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 2 Screw conveyor 3 Belt conveyor 4 Jet conveyor 5a, 5b, 5c Sand 6 Work unit 7 Transport vehicle 8 Loading path 8a Styrofoam board

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 3/00

Claims (2)

(57) [Claims] 1. A sand conveyor for projecting sand to a distant place sprays the sand on soft ground, and replenishes the sand supplied to the jet conveyor with a block-shaped thick styrofoam plate at a portion where the sand is scattered. A method of spraying sand on soft ground, wherein the method is performed by a transport vehicle traveling on a carrying-in path formed by the method. 2. The sand supplied to a hopper by a transport vehicle is continuously sent out to a screw conveyor, the sand supplied by the screw conveyor is supplied to a jet conveyor by a belt conveyor, and the sand is supplied to the soft ground by the jet conveyor. The method for spraying sand on soft ground according to claim 1, wherein the sand is sprayed.