JPH07100928B2 - Method for laying covering material on soft ground - Google Patents

Description

Description: <Industrial field of application> The present invention relates to a method for laying a covering material in ground improvement work carried out when a structure is built on soft ground.

<Prior art> Generally, when embankment is carried out on a soft ground mainly filled with silt or clay, a sheet-shaped covering material such as a net or cloth is laid, and then sea sand or a mountain Materials such as soil are piled up.

Conventionally, in the laying work of this covering material, it is usual that the covering material wound in a roll shape is manually transported to a predetermined position, and then the covering material is unfolded and laid, and the main part of the work relies on human power. . The work is carried out sequentially from the periphery of the soft ground toward the inside, but since it is often impossible to walk directly on the soft ground, the work can be carried out while walking on the covering material laid earlier. It is also possible to place a covering material on this using a pontoon, lay the covering material while towing the pontoon with a towing device installed on a hard ground in the vicinity, and perform a connecting work between adjacent covering materials. It has been implemented.

<Problems to be solved by the invention> When the work is carried out manually, particularly in soft ground, sludge-like silt or clay accumulates on the covering material and becomes a state where the bonding between the covering materials is performed by groping, In extreme cases, walking itself becomes difficult. Therefore, it is difficult to proceed with the work efficiently.

Also, when using a barge, a large barge causes a large frictional force with the ground due to the weight of the barge itself and the weight of the covering material.
A large traction force is required. In addition, small barges do not require so much tensile force, but instead require small transportation of covering materials and on-site bonding work on soft ground.

The present invention has been made in view of these points, and an object thereof is to provide a covering material laying method that does not require direct walking on soft ground and can be easily laid with a small traction force.

<Means for Solving the Problems> In order to achieve the above-mentioned object, in the method of the present invention, the starting end portion of the sheet-like covering material is widened and folded back downward, and the width of the sheet-like covering material is inside the folded-back portion. While laying a laying device composed of a roller portion corresponding to the above, temporarily fixing and fixing the above-mentioned starting end portion, pulling this laying device in a direction away from the starting end portion, while successively pulling out the unlaid portion of the sheet-like covering material by the roller portion. By rolling on the sheet-like covering material that has been pulled out, the sheet-like covering material is spread on a predetermined ground.

Further, guide wires are stretched on both sides of the region where the sheet-shaped 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 only rolls on the sheet-shaped covering material, and there is almost no friction with the covering material,
Also, since it does not touch the ground directly, there is no friction with the ground,
The sheet-shaped covering material can be spread and laid with a small traction force.

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

<Example> Next, the illustrated example will be described. FIG. 1 is a schematic perspective view of a main part for explaining 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 case where a laying device having another structure is used. It is a perspective view of an important part.

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

The sheet-shaped covering material 1 is a well-known net-shaped or cloth-shaped covering material, and is made of a material such as polyethylene or polyester. The laying device 2 is composed of a shaft 21 and rollers 22 rotatably supported by the shaft 21, and traction fittings 23 are attached to both ends of the shaft 21, respectively. The rollers 22 are made of, for example, Styrofoam and are light in weight, and a plurality of rollers 22 are arranged at predetermined intervals by the metal stoppers 24 corresponding to the width of the sheet-shaped covering material 1. Sheet-shaped covering material 1
When the width of the roller 22 is 6 m, for example, the roller 22 having a length of 90 cm and a diameter of 80 cm is used, and a total of five rollers 22 are arranged at intervals of 50 cm.

The length of the laying device 2 is selected according to the width of the sheet-shaped covering material 1, and can be appropriately extended by using the joint fitting 25. In this invention, since a large load is not applied to the laying device 2, the joint fitting 25
Can have a relatively simple structure.

A pulley of the pulley fixing plate 7 in which one end of the traction wire 3 is fixed to the towing metal fitting 23 and the other end is fixed by a fixing pile 71 or the like.
It is connected to the towing device 4 via 72. As the towing device 4, an appropriate device such as a winch or a bulldozer can be used. The tow metal fitting 23 has a wire insertion portion 23a into which the guide wire 5 is inserted, and both ends of the guide wire 5 are fixed to the pulley fixing plate 7 and the covering material mount 6.
It is fixed to the wire fixing plate 8 provided on each side, and is stretched with a strong tension on both sides of the region where the sheet-shaped covering material 1 is to be laid.

The towing device 4, the covering frame 6, the pulley fixing plate 7, the wire fixing plate 8 and the like are installed on the hard ground around the soft ground.

The sheet-shaped covering material 1 is laid as follows. First,
The sheet-shaped covering material 1 wound in a roll shape is placed on the covering material stand 6, the starting end portion 1a thereof is pulled out and spread, and the folded portion 1b is formed.
The laying device 2 is rolled up inside and is folded back downward, and the end edge is fixed on the solid ground by the temporary fixing pile 9.
Then, the towing device 4 is actuated, and the laying device 2 is towed through the towing wire 3 in the direction of the folded portion 1b, that is, in the direction in which the covering material 1 should be deployed. The unlaid portion 1c of No. 1 is sequentially pulled out, passes in front of the roller 22 of the laying device 2 and is successively developed on the soft ground to become the laid portion 1d, and the roller 22 rolls on this newly laid portion 1d. Meanwhile, the sheet-shaped covering material 1 is unfolded and laid. 51 is a wire tensioning machine.

When the end of the covering material 1 being drawn comes, the traction is once stopped, the next sheet-like covering material 1 is placed on the covering material stand 6, and the starting end of the covering material 1 and the end of the previous covering material 1 are joined to pull the traction material. Resume and continue work. This field connection is easy to perform as it can be carried out on solid ground and 10 shows this joint. By repeating the above steps as appropriate, the laying of one row from one end to the other end of the soft ground is completed, so that the same work is sequentially performed by moving to the next adjacent region.

At the time of the above work, the roller 22 of the laying device 2 only rolls on the covering material 1, and since the laying device 2 is lightweight, it hardly sinks into the soft ground.
Friction between the laying device 2 and the covering material 1 or the ground is small, and the sheet-like covering material 1 can be spread and laid by a small traction force.

Further, since the laying device 2 moves along the guide wire 5, the sheet-shaped covering material 1 can be accurately laid in a predetermined area, and the overlap margin between the sheet-like covering material 1 and the next covering material is laid. There is no shortage, and conversely there is no increase in the loss rate.

FIG. 4 shows an example in which the tire 22a is used as the roller portion of the laying device 2. When the sheet-shaped covering material 1 is not cloth-like and the covering material itself has a considerably high rigidity such as a net made of a synthetic resin, the axial dimension of each roller portion may be small as described above, and it is easily available. By using the tire 22a and the fitting 26 for the tire, the laying apparatus 2 can be constructed at low cost.

<Effects of the Invention> As is apparent from the above-described embodiments, the present invention folds the starting end of the sheet-shaped covering material downward to temporarily fix the starting end,
The laying device arranged inside the folded-back portion is rolled on the covering material in a direction away from the starting end portion to spread and lay the covering material. Therefore, it is possible to perform the laying work relatively easily and efficiently without the need for a person to walk directly in the soft ground or to use a barge, and the equipment does not require a large weight and has a simple structure. Since a small towing device and the like are sufficient, it becomes easier to reduce the construction cost as compared with the conventional construction method that requires large-scale equipment.

Further, since it is difficult to correct the position of the covering material once laid, conventionally, it was necessary to pay particular attention to the work so as to deploy the covering material while keeping the direction accurately. As described above, by stretching the guide wire on both sides of the predetermined area and moving the laying device along the guide wire, it becomes easy to correctly lay the covering material in the predetermined area, and in this respect also workability can be improved. it can.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a main part for explaining an implementation situation of an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a plan view of the same, and FIG. 4 is another structure. FIG. 7 is a perspective view of a main part when the laying device is used. 1 ... sheet-shaped covering material, 1a ... starting end portion, 1b ... folded portion, 1c ... unlaid portion, 2 ... laying device, 3 ... tensioning wire, 4 ... towing device, 5 ... guide Wire, 6
…… Coating material stand, 9 …… Temporary fastening pile, 10 …… Joint part, 21 …… Shaft, 22 …… Roller, 22 a …… Tire, 23 ……
Towing metal fittings.

Claims (2)

[Claims] 1. A sheet-shaped covering material is expanded at its starting end portion and folded back downward, and a laying device composed of a roller portion corresponding to the width of the sheet-like covering material is disposed inside the folded-back portion and the starting end portion is temporarily fixed. The sheet-shaped covering material is fixed by rolling the sheet-shaped covering material while pulling the laying device in a direction away from the starting end portion and sequentially pulling out the unlaid portion of the sheet-like covering material by the roller portion. A method of laying a covering material on soft ground, characterized by spreading the material on a predetermined 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 a region where the sheet-like covering material is laid, and the laying device is moved along the guide wire.