JPH045306A - Method for laying covering material on weak ground - Google Patents

Abstract

PURPOSE:To improve workability by arranging a laying device formed of a roller part, on the foldback part of a sheet-shaped covering material and drawing the laying device to roll the roller part on the sheet while successively drawing out an unlaid part of the covering material by means of the roller part. CONSTITUTION:A sheet-shaped covering material 1 wound in a roll shape, is laid on a covering material mounting bed and spread by drawing out the end part 1a of the covering material 1. An end edge is fixed onto the ground by a temporary stop pile by folding back the material 1 downward so as to roll a laying device 2 inside a foldback part 1b. The laying device 2 is drawn in a direction of the foldback part 1b through drawing wires 3 by actuating a traction device. Further an unlaid part 1c of the covering material 1 is successively drawn out and developed successively on the weak ground after passing through the front of rollers 22 of the laying device 2 to provide a laid part 1d, and the covering material 1 is laid while rolling the rollers 22 on the newly laid part 1d.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for laying a covering material in ground improvement work carried out when constructing a structure on soft ground.

<Conventional technology> Generally, when embanking on soft ground that has been reclaimed mainly from silt or clay, a sheet-like covering material such as a net or cloth is laid down and then sea sand, mountain sand, etc. Materials such as soil are piled up.

Conventionally, this covering material installation work involved manually transporting a small roll of covering material to a predetermined location, and then unrolling and laying it, relying on manual labor for the main part of the work. . Work is carried out successively inward from the periphery of the soft ground, but since it is often impossible to walk directly on the soft ground, the work proceeds while walking on the covering material that has been laid earlier. In addition, a barge is used to load the covering material onto the barge, and for example, the barge is towed by a towing device installed on the surrounding hard ground while the covering material is laid, and adjoining covering materials are joined together. is also being implemented.

<Problems to be solved by the invention> When work is carried out manually, especially on soft ground, sludge-like silt and clay accumulates on the covering materials, making it difficult to connect the covering materials by hand. In extreme cases, walking itself becomes difficult. This made it difficult to proceed with the work efficiently.

In addition, when using a barge, a large barge will have a large frictional force with the ground due to the weight of the barge itself and the weight of the covering material.
Large traction force is required. In addition, small barges do not require much pulling power, but require small transport of covering materials and on-site joining work on soft ground.

The present invention has focused on these points and has been made for the purpose of providing a method for laying a covering material that does not require walking directly on soft ground and can be easily laid with a small traction force.

Means for Solving the Problem> In order to achieve the above-mentioned object, the method of the present invention spreads the starting end of the sheet-like covering material, folds it back downward, and extends the width of the sheet-like covering material inside this folded part. A laying device consisting of a roller section corresponding to the above is arranged, and the laying device is pulled in the direction of the folded section, and the roller section sequentially rolls over the unlaid portion of the sheet-like covering material. By rolling the material, the sheet-like covering material is spread over a predetermined ground.

Further, guide wires are stretched on both sides of the region where the sheet-like covering material is laid, and the laying device is moved along the guide wires.

<Operation> According to the present invention, the roller portion of the laying device simply rolls on the sheet-like covering material, and there is almost no friction with the covering material.
In addition, since there is no direct contact with the ground, there is no friction between the ground and the ground.
The sheet-like covering can be unfolded and laid with a small traction force.

Furthermore, by moving the laying device along the guide wire, the sheet-like covering material can be correctly laid in a predetermined area.

<Example> Next, the illustrated example will be described. Fig. 1 is a schematic perspective view of the main parts to explain the implementation situation, Fig. 2 is a side view of the whole, Fig. 3 is a plan view of the same, and Fig. 4 is a diagram showing the case where a laying device with another structure is used. FIG. 3 is a perspective view of main parts.

In the figure, 1 is a sheet-like covering material, 2 is a laying device, 3 is a traction wire, 4 is a traction device, 5 is a guide wire,
6 is a covering material stand.

The sheet-like covering material 1 is a well-known net-like or cloth-like covering material, and is made of a material such as polyethylene or polyester. The laying device 2 is composed of a shaft 21 and a roller 22 rotatably supported by the shaft 21.
Towing metal fittings 23 are attached to both ends of each. The rollers 22 are lightweight ones made of styrofoam, for example, and a plurality of rollers are arranged at predetermined intervals by means of anti-slip fittings 24 in correspondence with the width of the sheet-like covering material 1.

If the width of the sheet-like covering material 1 is, for example, 6 m, the roller 22
The length is 90a1. A diameter of 80 (!l) is used, and a total of five of these are arranged at intervals of 50 cI+.

The length of the laying device 2 is selected according to the width of the sheet-like covering material 1, and can be extended as appropriate using a joint fitting 25. In this invention, the laying device 2
Since a large load is not applied to the joint fitting 25, a relatively simple structure can be used for the joint fitting 25.

One end of the towing wire 3 is fixed to the towing fitting 23,
The other end is connected to the traction device 4 via a pulley 72 of a pulley fixing plate 7 fixed by a fixing stake 71 or the like. As this traction device 4, an appropriate device such as a winch or a bulldozer can be used. The traction fitting 23 is equipped with a wire insertion part 23a, through which the guide wire 5 is inserted. and are stretched with strong tension on both sides of the area where the sheet-like covering material 1 is to be laid.

Note that the traction device 4, covering material frame 6, pulley fixing plate 7, wire fixing plate 8, etc. are installed on the hard ground around the soft ground.

Laying of the sheet-like covering material 1 is performed as follows.

First, the sheet-like covering material 1 wound into a roll is placed on the covering material stand 6, the starting end 1a is pulled out and spread out, and the laying device 2 is folded into the folded part 1b so as to be folded downward. The edges are fixed on the hard ground with temporary fixing piles 9. Then, when the traction device 4 is activated and the laying device 2 is pulled in the direction of the folded portion 1b via the traction wire 3, that is, in the direction in which the covering material 1 is to be deployed, the sheet-like covering material is Uninstalled part 1 of 1
c is sequentially pulled out, passes in front of the roller 22 of the laying device 2, and is sequentially spread out on the soft ground to form a laid portion 1d, and the roller 22 rolls over this newly laid portion ld, spreading the sheet-like coating. The material 1 is spread and laid. 51
is a wire tensioning machine.

When the end of the sheathing material 1 being pulled out is reached, the towing is temporarily stopped, the next sheet-like sheathing material 1 is placed on the sheathing material stand 6, its starting end is joined to the end of the previous sheathing material 1, and the towing is stopped. Resume and continue working. This on-site joining can be carried out on solid ground, so the work is easy, and 10 indicates this joint. By repeating the above steps as appropriate, one row of soft ground from one end to the other is completed, so the next step is to move to the first adjacent area and perform similar work one after another.

During the above work, the roller 22 of the laying device 2 simply rolls on the covering material 1, and since the laying device 2 is lightweight, it hardly sinks into soft ground. There is little friction between 2 and the covering material 1 and the ground,
The sheet-like covering material 1 can be unfolded and laid by a small traction force.

In addition, since the laying device 2 moves along the guide wire 5, the sheet-like covering material 1 can be accurately laid in a predetermined area, and there is an overlapping allowance between the covering material and the next adjacent covering material. There will be no shortage, or conversely, there will be no increase in the loss rate.

Figure 4 shows the installation! An example is shown in which a tire 22a is used as the roller section 12. If the sheet-like covering material 1 is not cloth-like but has a fairly high rigidity, such as a synthetic resin net, there is no problem even if the axial dimension of each roller part is small as in this case. By using the metal fittings 26 for the tire 22a and its attachment, it becomes possible to construct the laying device 2 at low cost.

<Effects of the Invention> As is clear from the above embodiments, according to the present invention,
By rolling the laying device placed inside the folded part of the sheet-like covering material over the covering material, the covering material can be unfolded and laid. The installation work can be carried out relatively easily and efficiently without the need for large-scale installations, and since the installation work can be carried out relatively easily and efficiently without the need for large-scale installations, it is sufficient to use installation equipment that does not require much weight and has a simple structure and a small towing device. This makes it easier to reduce construction costs compared to conventional construction methods that require

In addition, it is difficult to correct the position of the covering material once it has been laid, so in the past, it was necessary to be particularly careful in spreading the covering material while maintaining the correct direction. By stretching guide wires on both sides of a predetermined area and moving the laying device along them, it becomes easier to correctly lay the covering material in the predetermined area, improving work efficiency in this respect as well. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of essential parts for explaining the implementation status of one embodiment of the present invention, Fig. 2 is a side view of the entire same, Fig. 3 is a plan view of the same, and Fig. 4 is another structure. FIG. DESCRIPTION OF SYMBOLS 1... Sheet-like covering material, 1a... Starting end part, 1b... Turning part, 1c... Unlaid part, 2... Laying device, 3
... Traction wire, 4. Traction device, 5. Guide wire, 6. Covering material stand, 10. Joint part, 2
1..Axle, 22..Roller, 22a.tire, 23..
・Towing hardware. Patent applicant: Saeki Kensetsu Kogyo Co., Ltd. Representative: Patent attorney: Shino 1) Actual diagram

Claims (2)

[Claims] (1) Spread the starting end of the sheet-like covering material, fold it back downward, place a laying device consisting of a roller part corresponding to the width of the sheet-like covering material inside this folded part, and move this laying device in the direction of the folded part. The method is characterized in that the sheet-like covering material is spread over a predetermined ground by being towed by a roller and rolling over the pulled-out sheet-like covering material while sequentially pulling out the unlaid portions of the sheet-like covering material. Method of laying covering material on soft ground. (2) The method for laying a covering material on soft ground according to claim 1, wherein guide wires are stretched on both sides of the area where the sheet-like covering material is laid, and the laying device is moved along the guide wires.