JPH04198513A - Water-permeable bag structure for sand pile formation, and manufacture, application and construction thereof - Google Patents

Abstract

PURPOSE:To greatly raise the draining function of water by a method in which one or more water-permeable and long drain tubes are set along the longitudinal direction of a sand pile-forming vertically long and thin water-permeable bag structure, and sand or the like is packed into the bag structure to form a sand pile through which water is drained, even through the drain tubes. CONSTITUTION:A water-permeable thin and long drain tube 2 is directly set on the inside or outside of a water-permeable bag structure 1 of synthetic resin net or woven fabric to integrally connect the structure 1 with the pipe 2 from the lower end to the upper end. The structure 1 together with the tube 2 is penetrated into soft ground to pack sand into the structure 1. Water collected from the surrounding water-containing layer is passed through the sand pile and discharged even from the tube 2, where the water can only pass through the tube 2, but sand and other foreign matter do not pass. Great amount of water can thus be collected from the surrounding to attain sufficient accelerating effect of consolidating subsidence.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-permeable bag structure for forming sand piles, and more particularly to a bag structure made of a synthetic resin net or fabric for forming sand piles having a vertically long and narrow cylindrical shape.

By reducing the diameter of the vertically elongated cylindrical bag structure for forming sand piles, it is possible to reduce the amount of sand used in sand piles as much as possible on one side, while at the same time not reducing the drainage capacity on the other hand. I have to do it. Therefore, a sand pile forming machine was developed that made the pile pitch smaller and made it possible to drive multiple piles. However, in soft ground, such as a clay layer, which retains moisture and is difficult to release, heavy materials such as sand are piled on top of the soil and the soil is moved downward. Efforts have been made to extract water from water-containing strata such as clay layers by applying pressure, but there is a limit to the amount of sand that can be used, and the permeability of the sand used for sand piles is limited. Depending on the size of the project, the impact on the progress of the construction work has become greater. Therefore, it is necessary to use permeable sand for sand piles, but recently there is a shortage of high-quality materials such as river sand, so it is difficult to use sand that would interfere with the drainage function of sand piles. Therefore, it has become necessary to devise some other means to compensate for the lack of drainage function of sand piles.

The first object of the present invention is to solve the above problem.

In addition, the drainage capacity of water squeezed out of the clay layer due to consolidation, that is, the water flow capacity is insufficient, resulting in so-called pile loss. Particularly in the early stages of construction using the consolidation method, when the volume of drainage is large, a reduction in the drainage capacity of sand piles, that is, water flow capacity, causes delays in the construction period, and the prolongation of the construction period causes great damage. A second object of the present invention is to develop a means for reducing the aforementioned pile loss that inhibits the effect of promoting consolidation by the drain method.

Next, the specific structure of the container for achieving the above purpose will be explained according to the drawings.
One or more water permeable elongated drainage pipes 2 are arranged along the longitudinal direction of the sand pile forming bag structure, and the bag 1 of the sand pile forming bag structure is made of a water permeable bag structure made of synthetic resin net or fabric. The water-permeable elongated drain pipe 2 is placed directly along the inside or outside of the water-permeable bag structure, and the elongated water-permeable drain pipe 2 and the bag structure are integrated between the lower end and the upper end of the bag structure. connect to
Alternatively, the elongated drain pipe 2 and the bag structure are separated, and sand is interposed between them, and the diameter of [1] of the water-permeable elongated drain pipe 2 is the outer diameter of the sand pile. The diameter of the bag 1 of the bag structure is made to be in the range of 1/10 to 1/20 of the diameter of the bag 1 so that the water-permeable elongated drain pipe 2 can withstand external pressing force or pressure, and the elongated water-permeable drain pipe 2 is tube 2
The desired elongated drainage pipe 2 is formed by selecting either a permeable material or an impermeable material, and the elongated drainage pipe 2 is wound together with the bag structure, and when it is cast into soft ground, it is rolled up. A straight iron pipe with the front end of the desired diameter sealed is driven into the soft ground in advance, and then the bag structure is inserted together with the elongated drainage pipe 2, and sand is poured into the bag, and then, After only the iron pipe is pulled out, the bag filled with sand and the elongated drainage pipe 2 arranged along the long direction of the bag are left together with the sand, and the clay layer surrounding the permeable bag structure for forming sand piles is left behind. This is a water-permeable bag structure for forming sand piles, in which water collected from a water-containing layer consisting of sand piles passes through the sand piles and is also drained from a long and narrow drainage pipe.

Next, to describe the functions and effects resulting from the above configuration, according to the water permeable bag structure for forming sand piles of the present invention which is cast in soft ground, sand with relatively poor drainage function or a substitute thereof can be placed inside the bag. Even when filled, drainage is carried out through the sand pile and also through the water-permeable elongated drainage pipe placed along the sand pile, which greatly improves the drainage function compared to conventional sand piles. There is. In addition, the elongated drainage pipe allows only water to enter, but practically prevents sand or other foreign matter from entering, so the drainage function is improved compared to the case of only sand piles. In addition, especially in the early stages of consolidation settlement, the amount of drainage is extremely large, but compared to a simple sand pile, when using the bag structure for forming sand piles of the present invention, in addition to the function of the sand pile itself, the water permeable elongated drainage pipe Because of this, it has a very high ability to collect and drain a large amount of water from the surrounding area, so it can fully achieve the effect of promoting consolidation settlement. Additionally, in general, the larger the diameter of the sand pile, the better the drainage effect, but this requires a large amount of extra sand, so relatively thin sand piles must be driven, so use the thinnest sand piles possible. However, there is a limit to this, and as a result, the decline in water collection capacity has been suppressed by reducing the pile pitch.
Although it was possible to prevent the water collection capacity from the clay layer from decreasing, there is a limit to the ability of thin sand piles to improve the drainage function, that is, the water flow function of sand piles. If the quality is poor, the drainage function, that is, the water flow function, will be much lower than that of good quality sand, and the only countermeasures are to make the sand piles larger in diameter or to use good quality sand. There is no good way. However, a long, water-permeable drainage pipe is installed at a desired location inside or outside the sand or bag in the bag of the sand pile forming bag structure. This has the effect of increasing drainage capacity, that is, water flow capacity, by draining water using sand piles and elongated drain pipes.

In addition, by setting the diameter of the elongated drainage pipe, that is, the drain pipe, to be in the range of 1/10 to 1/20 of the diameter of the sand pile forming bag structure, that is, the diameter of the sand pile, it can be adapted to the differences in the properties of the strata of the soft ground. The diameters of the elongated drainage pipe and the bag structure for forming sand piles are appropriately selected so that the desired amount of drainage capacity, that is, water flow capacity can be exerted from both the sand pile portion and the elongated drainage pipe. It has a powerful effect.

[Brief explanation of the drawing]

Figure 1 is a slope view of the main part of the permeable bag structure for forming sand piles, and Figure 2 is the soil that is being consolidated and settled using the permeable bag structure for forming sand piles shown in Figure 1. This is a schematic diagram showing the situation in which water is collected from the soft stratum toward the sand pile due to two events, and is drained through the sand pile and drain pipes along it. Figure 3 shows the soft ground layer cut horizontally to explain how to maintain the distance between sand piles in terms of water collection function in the consolidation settlement construction work shown in Figure 2. FIG. 4 is a schematic diagram showing a state in which an elongated drainage pipe is disposed inside the sand pile forming bag structure horizontally, and FIG. FIG. 2 is a schematic diagram showing an embodiment of the present invention horizontally. 1-・・・Bag 2 of bag structure for sand pile formation
Elongated drainage pipe 3 --- Knot or seam 4 --- Embankment 5 --- Zandmat 6 --- Consolidated layer of soft clay ground 7 ---
・Virtual line 8 does not indicate the direction in which water flows...Sand 9...Boundary area 10 of the water division boundary area between sand piles...
・・・Support for elongated drain pipe

Claims (1)

[Scope of Claims] 1) A water-permeable sand pile forming bag structure in which one or more water-permeable elongated drain pipes are arranged along the longitudinal direction of the bag of a vertically slender cylindrical bag structure for sand pile forming. Sex pouch structure. 2) A water-permeable bag structure for forming sand piles according to claim 1, which comprises a water-permeable bag structure made of a synthetic resin net or fabric. 3) A water-permeable elongated drainage pipe is placed directly along the inside or outside of the bag structure for forming sand piles, and the elongated drainage pipe and the bag structure are integrally connected from the lower end to the upper end thereof. A water-permeable bag structure for forming sand piles according to claim 1. 4) The diameter of the water-permeable elongated drainage pipe can be set within the range of 1/10 to 1/20 of the outer diameter of the sand pile, that is, the diameter of the bag of the sand pile-forming water-permeable bag structure that surrounds the sand pile. A water-permeable bag structure for forming sand piles according to claim 1. 5) The water permeable bag structure for sand pile formation according to claim 1, wherein sand for sand piles is interposed between the water permeable elongated drainage pipe and the bag of the bag structure for sand pile formation. 6) Claim 1 in which the surface of the water-permeable elongated drainage pipe has a pressure-resistant strength such that it can withstand pressure from external sand during use, thereby preventing the waterway for drainage inside the pipe from being closed.
The water permeable bag structure for forming sand piles described above. 7) The water-permeable elongated drainage pipe and the sand pile forming bag structure are wound together before use, i.e., at all times, so that the water-permeable elongated drainage pipe can become a straight pipe by itself during use. The water-permeable bag structure for forming sand piles according to claim 1, which is made of a water-permeable bag structure. 8) The water permeable bag structure for forming sand piles according to claim 1, wherein the water permeable elongated drainage pipe is made bendable. 9) The water permeable bag structure for forming sand piles according to claim 1, wherein the water permeable elongated drainage pipe is formed of a water permeable material. 10) The water-permeable bag structure for forming sand piles according to claim 1, wherein the water-permeable elongated drainage pipe is formed of a water-impermeable material. 11) The sand pile formation according to claim 1, wherein at least one ear-shaped protrusion is formed on the side surface of the vertically cylindrical sand pile formation netting main body along the longitudinal axis direction of the net bag. Water permeable bag structure. 12) The water-permeable bag structure for forming sand piles according to claim 11, wherein the mesh main body for forming sand piles is formed of a synthetic resin. 13) A long strip of water-permeable material is fixed to the opposite side edges thereof by gluing, sewing, or other means so that it becomes an elongated cylinder in the longitudinal direction, thereby forming an elongated cylindrical body, which also has water permeability. The method for manufacturing a water-permeable bag structure for forming sand piles according to claim 1, which comprises arranging an elongated drainage pipe along the elongated cylindrical body. 14) The interval between the adjacent water permeable bag structures for forming sand piles according to claim 1 is set from a consolidated layer that is compatible with the drainage capacity of the sand piles and the water permeable elongated pipe of the water permeable bag structures for forming sand piles. A method of using a water-permeable bag structure for forming sand piles, which can be determined based on the water collection capacity of the sand pile. 15) The permeable bag structure for forming sand piles according to claim 1 filled with sand is driven into soft ground, then a sand mat is formed on the soft ground, and then embankment is placed on top of it. death,
By positioning the tip of the water-permeable elongated pipe along the sand pile forming water-permeable bag structure in the sand mat and communicating the sand of the sand pile with the sand of the sand mat, a drainage function is achieved. A consolidation method using the water-permeable bag structure for forming sand piles according to claim 1, which improves the performance of sand piles.