JPS633086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to prevent cracks from occurring at the joint between the slope and the bottom surface due to uneven ground subsidence, flooding, etc. in reservoirs or industrial waste disposal sites, etc. This is a water-blocking construction method used when constructing a reservoir or the like to prevent water from leaking from the joints due to, for example, tearing of the sheets at the joints.

Conventionally, the main method of impermeability construction for reservoirs and the like has been to use soil materials, followed by concrete structures, but it is difficult to obtain high-quality soil materials, or there are none at all. In the case of concrete structures, it is difficult to follow the uneven settling of the ground over time.
Occurrence of cracks cannot be avoided and becomes a cause of water leakage. In recent years, a bituminous mixture compaction method using asphalt facing and lining has been adopted as an alternative to the conventional impermeability method. Furthermore, with the development of petrochemistry, various synthetic rubbers and synthetic fibers have appeared on the market as civil engineering materials, and a water-blocking sheet construction method is used to cover the inner surfaces of reservoirs, etc. with synthetic rubber sheets or asphalt-impregnated synthetic fiber sheets using these materials. A combination of the bituminous mixture compaction method and the sheet method is used for construction, in which the bottom of reservoirs, etc. is constructed using the bituminous mixture compaction method, and the slopes are constructed using the sheet method. The bituminous mixture compaction method, in which watertight, dense-grained asphalt concrete is compacted to form a structure from the bottom to the slope, has many advantages such as durability and adaptability to the foundation. In cases where it is difficult to form slopes, forming the slope becomes expensive, which has the disadvantage of increasing the overall construction cost. Further, although the sheet construction method of covering the reservoir molding surface with a sheet can be constructed at relatively low cost, it has drawbacks in the strength, durability, etc. of the sheet.

On the other hand, according to a construction method that combines the bituminous mixture compaction method and sheet construction method, the slope is covered with a water-blocking sheet using the sheet method, and then the bottom surface is constructed using the bituminous mixture compaction method. By taking advantage of the characteristics of both construction methods, it is possible to construct a relatively low-cost and durable reservoir, etc. However, due to fluctuations in the amount of water stored and external forces generated when the ground settles unevenly, the bottom and slopes may deteriorate. The drawbacks of water leakage due to cracks occurring at the joint with the sheet, and the sheet being easily damaged have not yet been resolved.

In view of the above, the present invention provides a water-blocking construction method for reservoirs, etc., which consists of a slope covered with a waterproof sheet and a bottom formed by compacting a watertight bituminous mixture. A trench is drilled along the periphery on the bottom side where the slope contacts, the waterproof sheet is continuously covered from the slope to cover the inner surface of the trench, and the lower part of the trench covered with the waterproof sheet is made of granular material. , The upper part has an expansion/contraction adjustment section made of a waterproof sheet filled with a flexible sealing material.
It is an object of the present invention to provide a water-blocking method that prevents water from leaking due to damage to the sheet due to tensile force acting on the sheet.

Hereinafter, the present invention will be explained with reference to embodiments.

FIG. 1 shows an example in which an asphalt-impregnated sheet is used as the waterproof sheet, and 1 is a reservoir built by excavating the ground. The slope 2 of the reservoir 1 is constructed by covering the slope 3 of the ground with the waterproof sheet 4 described above. That is, the upper end of the waterproof sheet 4 is wrapped around a piece of wood or the like and then embedded and fixed in the soil at the top of the slope of the ground, while the lower end is laid on the top surface of the crushed stone base 5 at the bottom of a reservoir, etc. It is sandwiched between a bottom surface 6 formed by a watertight ascon layer 7 and a crushed stone base 5. A flexible special sealing material 9 is filled at room temperature between the slope 2 and the end face of the heated watertight ascon layer 7 to fill the gap and provide a cushioning effect. As the special sealing material, a mixture of an organic polymeric material and soft asphalt is used, such as a mixture of butene, Hyroad K (butadiene rubber solution), amorphous propylene, etc., and soft asphalt. Furthermore, a mastic seal coat 8 is applied over the entire upper surface of the watertight ascon layer 7 to form a bottom surface 6. Reference numeral 11 denotes an expansion/contraction adjustment section of the waterproof sheet 4 provided on the bottom surface 6. This expansion/contraction adjustment part 11 is made by drilling the junction between the slope 2 and the bottom surface 6, that is, the peripheral edge of the bottom surface 6 to provide a trench 10, and covering the inner surface of the trench 10 with the waterproof sheet 4 located in the trench 10. The lower part of the trench 10 is filled with a filler 11' such as sand, so that when the waterproof sheet 4 is pulled by an external force acting on the bottom surface 6, the waterproof sheet 4 in the trench 10 is pulled out and the tensile stress is absorbed. This is meant to be relaxed. 12 is a drain discharge pipe provided within the crushed stone base 5. Of course, in this embodiment where an asphalt-based sheet is used as the waterproof sheet 4, the expansion/contraction adjustment section 11 can be omitted because the waterproof sheet is less susceptible to deterioration due to tensile stress due to the nature of the material.

Figure 2 shows an example in which a synthetic rubber sheet, a polymer sheet such as vinylon chloride, or polyethylene is used as the waterproof sheet, and the waterproof sheet 4 deteriorates due to heating compared to the previous example. Waterproof sheet 4
Heated watertight ascon layer 7 whose lower end forms the bottom surface
The part of the base 5' to be laid on the lower surface is formed one step lower than the base surface 5a of the crushed stone base 5, the lower end of the waterproof sheet 4 is laid on the base 5', and the room-temperature ascon layer 7 is placed on top of the lower end of the waterproof sheet 4. ' is paved to fix the waterproof sheet 4, and then the heated watertight ascon layer 7 is compacted on top of the room temperature ascon layer 7' to form the bottom surface 6, and the waterproof sheet 4 is directly attached to the heated watertight ascon layer 7. This is an embodiment in which the waterproof sheet 4 is prevented from being damaged by heat by avoiding contact with the waterproof sheet 7.

As described above, the waterproof construction method for reservoirs, etc. according to the present invention is applied to the joint between the slope of the reservoir, etc., which is formed by covering the slope of the ground with a waterproof sheet, and the bottom surface, which is compacted with a watertight bituminous mixture. Filling with a special flexible sealing material prevents direct contact between the bottom edge and the slope, preventing increases and decreases in the amount of water stored in reservoirs, changes in the uplift pressure of seepage water from the ground surface, and preventing soil damage. The flexibility of the sealing material can buffer the force that acts during uneven settlement, etc., thereby preventing damage and cracking at the joint between the slope and the bottom edge. or,
By providing a sheet expansion/contraction adjustment section on the periphery of the bottom surface, it is possible to alleviate the stress that acts due to the various causes mentioned above and prevent the sheet from being damaged.Especially when using a synthetic rubber sheet, etc. In such cases, due to the properties of the material, ozone deterioration under tensile stress is accelerated and the sheet is prevented from being damaged.This feature allows the construction of reservoirs, etc. that are relatively low cost, have excellent water-blocking properties, and are highly durable. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a reservoir showing an embodiment of the present invention, and FIG. 2 is a sectional view of the same in another embodiment. 1... Reservoir, 2... Slope, 4... Waterproof sheet, 5
...crushed stone base, 6...bottom surface, 7...heated watertight ascon layer, 7'...normal temperature ascon layer, 8...mastic seal coat, 9...special sealing material, 10...trench,
11...Expansion adjustment section.

Claims (1)

[Scope of Claims] 1. In a reservoir, etc., which is composed of a slope formed by covering the slope of the ground with a waterproof sheet and a bottom formed by compacting the bottom with a watertight bituminous mixture, the slope and the bottom are in contact with each other. A trench is excavated along the bottom edge of the slope, and the waterproof sheet is continuously applied from the slope to cover the inner surface of the trench. A waterproof construction method for water reservoirs, etc., characterized in that the upper part is provided with a waterproof sheet expansion/contraction adjustment section filled with a flexible sealing material. 2. In reservoirs, etc., which are constructed by covering the slope of the ground with a waterproof sheet and the bottom by compacting the bottom with a watertight bituminous mixture, A room-temperature bituminous mixture layer is interposed on the bottom surface in contact with the waterproof sheet to prevent deterioration of the waterproof sheet due to heat, and then a watertight bituminous mixture is laid over the entire bottom surface. Waterproof construction methods such as