JPS634123A - Water-proof construction for underground structure - Google Patents

Abstract

PURPOSE:To reduce the quantity of excavated soil and shorten the term of construction and save a cost, by a method wherein guide piles are driven on the outer periphery of an underground structure, wherein a wooden sheet pile is fitted between the guide piles, wherein a water-conveyance sheet with a projection is fitted up on the piles, and wherein a water-proof bed plate is fitted with nails. CONSTITUTION:Prior to the construction of an underground structure 1, the guide piles 2 of 'H' shape steels, 'I' shape steels, or the like are driven, and along with excavation, between the guide piles 2, 2, both the ends of a wooden sheet pile 4 is fitted and fixed for sheathing. After that, on the wooden sheet pile 4, a plywood 5 is fitted with nails, and on the plywood 5, a water- conveyance sheet 8 with a projection is fitted up with a stapler or the like, and on the sheet 8, a water-proof bed plate 9 is fitted with nails and a water- proof sheet 10 is bonded. As a result, between the wooden sheet pile 4 and the water-proof bed plate 9, a space is not generated, and the quantity of excavated soil can be reduced, and in backfilling, a drainage space is not filled up with mortar, and a cost can be extremely saved.

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. Especially 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 to do so. Therefore, in order to carry out waterproofing work from the outside after constructing an underground structure, a working space of at least 1.6 mm is required between the earth retaining surface of the excavation and the side wall of the structure. In the so-called advance waterproofing method, which performs waterproofing work, first, parent stakes such as H-shaped steel or ■-shaped steel are driven along the earth retaining line at regular intervals on both sides 20 to 110 cm away from the structure. At the same time as digging, wooden sheet piles are inserted between the main piles to secure the soil. 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 gushing out from this earth retaining surface, a distance of IO to 15 holes is placed inside the earth retaining surface, and pieces of crosspieces are attached to the wooden sheet piles with pieces at regular intervals parallel to the earth retaining surface and fixed. To create a drainage space, plywood is further nailed to the crosspieces, a waterproof base board is nailed on top of that, and then a waterproof sheet is pasted. After constructing further underground structures,
Since the drainage space must be filled with mortar, the work is very complicated.

(Problems to be solved by the invention) In the conventional 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. And so. 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 provides a waterproofing method for underground structures that minimizes the amount of soil to be excavated, does not impair drainage function, and is easy to construct. With the goal.

(Means for solving the problem) When waterproofing the outer periphery of underground structures such as subways and public ditches, it is recommended to drive parent piles such as H-beams at regular intervals before constructing these underground structures. In parallel with the excavation, wooden board piles are fitted between the main piles and fixed, plywood is nailed onto the wooden board piles, and a water guide with protrusions is placed on top of it to facilitate drainage. 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. Figures 2 and 3 are a perspective view and a horizontal cross-sectional view, respectively, showing an embodiment of the present invention.
Prior to construction of the ground (3), parent piles such as H-shaped steel or
) at least 30'X immediately to prevent it from collapsing.
The wooden sheet pile (4) having a thickness of , or more, is attached to the main pile (2).
Fit it in between and fix it to keep it in place. At this time, if necessary, drive a wedge between the wooden sheet pile and the main pile, and attach the wooden sheet pile (4).
Make it adhere to the ground (3). As the excavation progresses, the wooden sheet pile (4) is removed from the 7th rank part (2) of the main pile.
As it goes downward along the inside surface of a), insert new wooden sheet piles from above one by one to secure the earth. Wooden piles (4
) is subject to strong earth pressure, and both ends of the wooden sheet pile (4) are supported by the 7-rank part (2a) of the parent pile, but thick ones are used to withstand the earth pressure. It is preferable to do so.

Next, plywood (5) is nailed and fixed on top of the wooden pile (4), but the plywood (5) is attached to the rank 7 portion of the main pile (5) so that the finished surface forms a flat surface. The same thickness as y is used as the thickness in 2a).

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 sheet piles (4) between the main piles (2), place the wooden sheet piles at a distance of 70 to 1S on the inside of the wooden sheet piles, and insert the pieces (6) at regular intervals parallel to the retaining surface. ), the installation was fixed to the wooden board pile (4), and this part formed the drainage space.

However, according to an embodiment of the present invention, the veneer plywood (5)
Temporarily fasten a water guide sheet (8) with protrusions, preferably a roof ink having a plurality of parallel protrusions on the entire surface of one side, using a stapler or the like to the completely nailed finished surface. Water gushing out from the retaining surface can be drained through the space in 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.

Water-conducting sheet with projections (8) The shape of the D projections is not limited to the above-mentioned plurality of parallel projections, and may be, for example, many circular or angular shapes. It works in the same way if it forms a communicating space after construction.

Next, a waterproof base plate (9) is placed on top of the water guide sheet with protrusions (8).
A bituminous board, preferably between ~/Q% thick, is fixed to the veneer plywood (5) with nails long enough to reach said veneer plywood (5). Drainage is carried out by the water guiding sheet (8) with protrusions, so the surface of the waterproof base plate (9) is kept dry and provides a good waterproof base surface. can give. A waterproof sheet (1@) is pasted on top of this, but if the waterproof subsurface is wet or has not dried sufficiently, the nuclear subsurface protection sheet αQ will not adhere to the subsurface due to the influence of moisture. It is easy to cause problems if the waterproof sheet peels off after installation.As in the example, if the waterproof base is sufficiently dry, use a waterproof sheet α1?'i with an adhesive layer to remove the release paper and leave it as it is. It may be pasted, or it may be pasted with an adhesive or the like without an adhesive layer.

(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. be.

Claims (1)

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