JPH0317962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bag used in the so-called pack drain method, which is a type of ground improvement method, in which the outer periphery is surrounded by a bag body to form a sand pillar.

In the pack drain construction method, a cylindrical mesh bag is filled with sand and a drain is formed underground, which prevents the sand column from becoming constricted or cut midway through, resulting in a stable and uniform sand column. This improves reliability.

Sand drains packed in bags like this need to have their upper ends exposed for a certain length above the ground, and unlike construction on land, when construction is carried out underwater, the sand filled inside the bag must be exposed to prevent it from flowing out. The top opening of the bag must be closed.

Previously, professional divers would dive to the bottom of the water and tie each drain manually with string, but this method requires more labor when there are many drains, increases construction costs, and takes longer to complete. It was hot.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a bag for a sand drain whose upper end opening can be simply and quickly closed from above the water without using any special equipment, and whose construction can be rationalized.

However, according to the present invention, the purpose of the lever is to provide a cylindrical bag with a closed bottom, a loop at one end of the rope while the rope is inserted through a through hole formed along or near the upper edge. , the other end passes through this ring to form a tightening ring, and the rope after passing through the ring is extended downward and its tip is fixed to the bag, and the rope end forming the tightening ring is inserted upward into or near the ring. This is achieved by locking the tension rope to the

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the bag of the present invention.
The bag body 1 has a cylindrical shape with a closed bottom, and is made of a net formed by plain weaving or circular weaving of strong synthetic yarn, such as monofilament of polyethylene, nylon, Tetron, etc., and has a bottom and a mouth area. ,
Necessary stitching is done on the sides.

As an example, using 400 denier polyethylene, 22 pieces/inch in the vertical direction and 16 lines/inch in the horizontal direction are used.
Fabric strength: length 100Kg/5cm width, width 77Kg/5cm
The width was sewn into a bag with a diameter of 60.5cm and a length of 25m.

A through hole 2 along the circumference is formed in the upper opening edge 1a of the bag 1. This through hole 2 is for a rope to pass through as will be described later, and in addition to being formed by folding the opening edge of the bag 1 inward as shown in the figure and sewing the edges of the bag 1 together, it can also be formed by sewing the edges of the bag 1 inward as shown in the figure. Small metal ring bodies 14, 14', 14''... are attached at appropriate intervals, or discontinuous small holes 15, 15', 15''... are provided as shown in Fig. 10, and the rope is sewn through them. Various formation methods are conceivable, such as one in which:

A rope 3 as shown in FIG. 2 is inserted through the through hole 2. The rope 3 is provided with a ring portion 4 at one end, and the other end is passed through the ring portion 4 to form a tightening ring 3a. The size of the tightening ring 3a is approximately the same as the opening of the bag 1 through the through hole 2. Also,
The other end of the rope 3 that has passed through the ring portion 4 is extended downward, and its tip is fixed to the inside or outside of the bag 1. FIG. 10 shows an example of fixation on the outside. This fixing point may be in the middle of the bag 1 or at the bottom, and the second
In the figure, P to B indicate this stoppage. In addition, in FIG. 2, the length ₁₁ from the ring part 4 to P of the rope 3 is slightly longer than the circumference of the opening edge 1a of the bag 1, and furthermore, The length 1 ₂ from 2 to the fixed point P' of the rope 3 is longer than 1 ₁ above.

On the other hand, directly on the ring part 4 or on the ring part 4 of the tightening ring 3a.
Another ring part 5 is provided near the ring part 5 to which an upward pulling rope 6 is locked. The rope 6 may be locked by tying the ends together, but it is preferable to insert it and turn it back, and it is also preferable to provide a distance scale 7 on the rope 6 from above to this locking part.

The ropes 3 and 6 were made of natural or synthetic ropes such as Manila hemp with a diameter of 4 mm, and had a dry tensile strength of 150 kg and a knot strength of 60 kg.

Next, to explain the usage and effect, the third
As shown in the figure, a sand mat 8 is laid on the bottom of the water (seafloor), a casing 9 is driven to a predetermined depth as shown in FIG. 4, and water 10 is poured into the casing 9. Next, as shown in FIG. 5, the bags 1 housed in the cassette are sequentially dropped into the casing 9 while being filled with sand 12 saturated with water from the hopper 11. At this time, the water 10 inside the casing 9 is controlled while returning upward from the bottom through the circulation pipe 13 (Fig. 6), and when the bag 1 reaches the bottom, the casing 9 is pulled out as shown in Fig. 7. .

In this way, as shown in FIG. 8, the bag body 1 filled with sand 12 is installed as a sand drain, and the rope 6 is previously secured to the ring part 5 (or the ring part 4). When pulled from the ship, the tightening ring 3a narrows and the opening edge 1a also closes (see Fig. 9). In this case, the rope 3 of bag body 1
Since the length ₁₂ above the point where P point is stopped is longer than ₁₁ as mentioned above, there is still room even when the rope 3 is fully extended, and as a result, the mouth of the bag body 1 is completely closed. Once the mouth is closed, the pressure flow of water ejects from the inside of the sand column will cause the bag body to close.
The top of the bulges out and tries to stretch upwards, so it won't open again.

On the other hand, the tension rope 6 can be easily recovered by leaving one end free and pulling it out from the ring part 5 after work, and if it has been fixed to the ring part 5 or 4 or its vicinity, it can be discarded. .

The scale 7 provided on the rope 6 can be used as a measuring scale when laying the drain, and the work of separately performing a measuring operation can be omitted.

As described above, the side drain bag of the present invention allows the upper opening of the bag to be closed easily, quickly and reliably without using any special equipment or equipment.
In particular, when constructing a drain underwater, there is no need for a diver to close the drain, which is required in the past, resulting in streamlining and cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the bag of the present invention, FIG. 2 is a front view of the rope used in the present invention, and FIGS.
Fig. 7 is a sectional view showing the construction process, Fig. 8 is a longitudinal sectional front view of the bag set, Fig. 9 is a longitudinal sectional front view of the bag with the mouth closed, and Fig. 10 is a longitudinal sectional view of the bag of the present invention. FIG. 11 is a front view showing another embodiment. FIG. 11 is a partial front view showing the third embodiment. 1...Bag body, 1a...Opening edge, 2...Through hole,
3... Rope, 3a... Tightening ring, 4, 5... Ring portion, 6... Rope, 7... Scale, 8... Sand mat, 9... Casing, 10... Water, 11...
Hopper, 12...Sand, 13...Circulation pipe, 1
4, 14', 14''... ring body, 15, 15',
15″…small hole.

Claims (1)

[Claims] 1. In a cylindrical bag with a closed bottom, a rope is inserted into a through hole formed along the upper edge or the vicinity thereof, a ring is provided at one end of the rope, and the other end is passed through the ring. A tightening ring was formed, and the rope after passing through the ring was extended downward and its tip was fixed to the bag, and an upward pulling rope was locked at or near the rope end ring forming the tightening ring. A sand drain bag characterized by: