JPH0452814B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a preliminary waterproofing method for underground structures such as subways and public ditches.

(Prior Art) Conventionally, waterproofing work has been performed on underground structures such as subways and public ditches prior to construction of these structures. Particularly in urban areas, the amount of soil to be excavated should be minimized, the number of related above-ground properties subject to construction compensation should be minimized, and the width of the excavation should be made as narrow as possible to eliminate traffic hindrances as much as possible. It is customary. Therefore, in order to perform waterproofing work from the outside after constructing an underground structure, a work space of 1 m or more is required between the earth retaining surface of the excavation and the side wall of the structure, but it is necessary to In the so-called pre-emptive waterproofing method, waterproofing work is carried out first on the structure.
Drive main stakes such as H-beams and I-beams at regular intervals on both sides, 40 cm apart, along the earth retaining line, and fit wooden sheet piles between the main stakes in parallel with the excavation. Make a soil retainer. In addition, if necessary, wedges are driven between the wooden sheet piles and the main piles to keep the wooden sheet piles in close contact with the ground.

Next, in order to drain the water that gushes out from this earth retaining surface, a distance of 10 to 15 cm is placed inside the wooden sheet pile, and piers are attached to the wooden sheet pile with pieces at regular intervals parallel to the earth retaining surface and fixed to drain water. After creating a space, plywood plywood is nailed to the crosspiece, a waterproof base board is nailed on top of the plywood, and a waterproof sheet is attached. Furthermore, after constructing the underground structure, the drainage space must be filled with mortar, which makes the work very complicated.

(Problems to be solved by the invention) In the conventional pre-emptive waterproofing method, it takes a lot of time and money to create the drainage space and waterproof foundation and to fill the drainage space with mortar after constructing the underground structure. did. Furthermore, as cities become more densely populated, there is a need to reduce the amount of soil to be excavated. The present invention has been made to solve the above problems, and aims to provide a waterproofing method for underground structures that minimizes the amount of soil to be excavated, does not impair the drainage function, and is easy to construct. purpose.

(Means to solve the problem) When waterproofing the outer periphery of underground structures such as subways and public ditches, it is necessary to drive parent piles such as H-beams at regular intervals prior to the construction of these underground structures. A wooden board pile is inserted and fixed between the main piles in parallel with the excavation, and a plywood plywood is nailed on top of the wooden board pile. This method of waterproofing underground structures is characterized by temporarily fixing sheets with staples, etc., and then nailing a waterproof base plate on top of the sheets and pasting the waterproof sheet.

(Example) Examples and effects of the present invention will be described in detail based on the drawings. 2 and 4 are a perspective view and a horizontal cross-sectional view, respectively, showing an embodiment of the present invention.
Drive a parent pile 2 such as an H-beam or an I-beam into each area, and immediately install wooden sheet piles 4 with a thickness of at least 30 m/m in parallel with the excavation to prevent the ground 3 from collapsing. are fitted between the main piles 2 and fixed to retain the ground. At this time, if necessary, wedges are driven between the wooden sheet piles and the main piles to bring the wooden sheet piles 4 into close contact with the ground 3. As the excavation progresses, the wooden sheet piles 4 move downward along the inner surface of the flange portion 2a of the parent pile, so new wooden sheet piles are successively fitted from above to retain the soil. Wooden pile 4
A considerable amount of earth pressure is applied to the pile, and both ends of the wooden sheet pile 4 are supported by the surfaces of the flange portions 2a of the parent pile.However, it is preferable to use a sheet pile that is thick enough to withstand the earth pressure.

Next, the plywood 5 of the wooden board pile 4 is fixed with nails, but the plywood 5 should have approximately the same thickness as the flange portion 2a of the parent pile so that the finished surface forms a flat surface. use

Conventionally, the water that gushes out from the excavated earth retaining surface seeps inward through the gaps between the wooden sheet piles, so it is necessary to provide a space for drainage, as shown in Figures 1 and 3. After inserting the wooden sheet piles 4 between the main piles 2, place the wooden piles 6 and 7 at regular intervals parallel to the retaining surface at a distance of 10 to 15 cm inside the wooden sheet piles.
It was attached and fixed to wooden sheet piles 4, and the bottom part formed a drainage space.

However, according to the embodiment of the present invention, the water guide sheet 8 with protrusions, preferably the roofing having a plurality of parallel protrusions on the entire surface of one side, is temporarily attached with staples or the like to the finished surface to which the plywood 5 is nailed. Stop it. Water gushing out from the retaining surface can be drained through the space of the recessed portion of the water guide sheet 8 with projections. Even if the height of the protruding portion is several millimeters, it is possible to drain water extremely easily.

The shape of the protrusions of the protrusion-equipped water guide sheet 8 is not limited to the plurality of parallel protrusions described above, and may be, for example, a large number of circular or angular shapes. It works in the same way if it forms a communicating space after construction.

Next, on top of the water guide sheet 8 with projections, a waterproof base plate 9, preferably a bituminous plate with a thickness of 6 to 10 m/m, is placed.
It is fixed to the veneer plywood 5 with nails long enough to reach the veneer plywood 5. Since drainage is carried out by the water guiding sheet 8 with projections, the surface of the waterproof base plate 9 is kept dry and a good waterproof base surface can be provided. A waterproof sheet 10 is pasted on top of this, but if the waterproof base surface is wet or not sufficiently dried, the waterproof sheet 10 may not adhere to the base surface or peel off after installation due to the influence of moisture. can easily cause trouble. As long as the waterproof base surface is sufficiently dry as in the example, the waterproof sheet 10 with an adhesive layer may be attached as is while peeling off the release paper, or the waterproof sheet 10 without an adhesive layer may be attached with an adhesive, etc. It doesn't matter if you paste it with.

(Effects of the invention) If the waterproofing method for underground structures of the present invention is used, no space is created between the wooden sheet piles and the waterproof foundation board, so the amount of soil to be excavated can be reduced by that amount, and it is possible to reduce the amount of soil that needs to be excavated by that amount. There is no need to install piers or pieces as was previously the case, and there is no need to fill the drainage space with mortar when backfilling after constructing an underground structure. Therefore, it is possible to significantly shorten the construction period and reduce costs.

[Brief explanation of the drawing]

1 and 3 are a perspective view and a horizontal sectional view showing a conventional waterproof construction state, and FIGS. 2 and 4 are a perspective view and a horizontal sectional view showing a waterproof construction state according to an embodiment of the present invention. . 1... Underground structure, 2... Main pile, 2a... Flange part of main pile, 3... Earth, 4... Wood pile, 5...
...Plywood plywood, 6...Structure, 7...piece, 8...Water conductive sheet with protrusions, 9...Waterproof base plate, 10...
Tarpaulin.

Claims (1)

[Claims] 1. When carrying out waterproofing work around the outer periphery of underground structures such as subways and public ditches, prior to the construction of these underground structures, parent piles such as H-shaped steel are driven in at regular intervals, and wood piles are installed in parallel with the excavation. The sheet piles are fitted and fixed between the main piles, plywood is nailed on top of the wooden sheet piles, and a water guide sheet with protrusions is temporarily fastened on top of it with staples to facilitate drainage. A method of waterproofing underground structures, which is characterized by nailing a waterproof base plate and pasting a waterproof sheet thereon.