JP2706407B2 - Water stopping method for underground storage tank structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping method for preventing underground water around a side wall from entering a crushed stone layer under a bottom plate in an underground storage tank structure.

[0002]

2. Description of the Related Art FIG. 2 shows the structure of a conventional underground storage tank structure, in which a crushed stone layer 2 laid on the inside of the bottom of a side wall 1 constructed inside a ground E by reverse winding or forward winding. A bottom plate 3 built on the top of the crushed stone layer 2 and having the periphery integrated with the side wall, and a clearance formed on the outer periphery of the side wall 1 and filled with a permeable material such as crushed stone and sand. And a roof (not shown) arranged above the side wall 1.

In the gutter 4, groundwater supplied from the surrounding ground E is stored, and the bottom reaches the bottom of the side wall 1. This prevents groundwater from flowing into the crushed stone layer 2 side.

[0004]

That is, according to the underground storage tank structure having such a structure, the underground water stored in the inside of the gutter 4 is provided on the bottom plate 3 so that the bottom plate 3 is not subjected to water pressure. It is possible to prevent the intrusion into the crushed stone layer 2 due to the head difference from the crushed stone layer 2 at the lower part of the bottom slab 3, and to easily manage the circulation of the groundwater in the underground storage tank structure. And, in order to prepare for a case where the amount of water that is going to enter the crushed stone layer 2 increases due to an increase in the head difference, etc., and to more easily manage the circulation of the groundwater, the groundwater crushed stone layer 2 is more effectively moved. It is desired to develop a water stopping method capable of preventing intrusion of water.

The present invention has been made in view of the above situation, and is an easy-to-construct and economical underground storage tank that can more effectively prevent groundwater from entering a crushed stone layer. An object of the present invention is to provide a method for stopping water from a structure.

[0006]

In order to achieve the above object, the present invention relates to a side wall constructed in the ground, a crushed stone layer disposed inside a bottom portion of the side wall, and In a subterranean storage tank structure provided with a bottom plate having a peripheral edge integrated with a side wall and a gutter provided as a clearance portion filled with a material such as crushed stone or sand provided around the side wall,
Prevents water in the gutter from sneaking into the crushed stone layer at the bottom
A water stopping method for stopping, wherein the ground immediately below the side wall is excavated in a vertically long shape by a narrow groove excavator such as a chain cutter, and solidification of water stopping mortar, concrete for water stopping and the like is performed inside the excavation groove. The material is cast to form a continuous water stop wall immediately below the side wall.

[0007]

According to the above construction, the excavation groove at the lower part of the side wall is excavated by the excavator dedicated to the narrow groove, so that the excavation groove has a narrow groove width without disturbing the peripheral edge of the ground, and the excavation depth is elongated vertically. It is possible to excavate the groundwater without any need for a lot of material, and to easily prevent groundwater from penetrating into the lithotripsy layer by easily increasing the length of the groundwater seepage path. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 (a) to 1 (c) show a construction procedure of a water stopping method according to the present invention. The same parts as those in the related art will be described with the same reference numerals. First, in FIG. 1A, a vertically long excavation groove 12 is excavated along a site where the side wall 1 is to be constructed at the lowest portion of the ground E using a narrow groove excavator, for example, a chain cutter 10 or the like.

This chain cutter 10 is a well-known one and is drawn in a simplified state. However, a large number of cutters planted along the chain at the tip of the arm cut the ground while rotating endlessly. This excavates the ground with a groove width according to the cutter width in order. Excavation can be accurately performed at a width according to the cutter width without disturbing the ground around the periphery of the excavation groove 12 as compared with a backhoe or other excavator. In the example, in one excavation operation, the excavation depth is about 1.5 m and the groove width is about 1.
About 5cm of portrait-like drilling groove 12 building plans of the side wall 1 箇
It will be formed just below the place .

Next, as shown in FIG. 1B, when a mortar or the like for stopping water is poured into the excavation groove 12 in a state where a welded wire mesh 14 for reinforcing the crack is installed, the vertically-arranged water stopping wall 1 is formed.
6 is completed.

Then, a waterproofing concrete 5 is poured as a waterproofing work at a position corresponding to the bottom of the gutter 4 and a side wall 1 is constructed continuously above the waterproofing wall. Layer 2 is spread. After laying the crushed stone layer 2 and constructing the bottom slab 3, as shown in FIG. 3 (c), the water stopping work of the underground storage tank structure in which the vertically long water stopping wall 16 is integrated immediately below the side wall 1. Is completed. Since the water stop wall 16 is vertically long, the water stop wall 16 has a sufficient groundwater permeation path length, whereby an excellent water stop effect can be obtained.

[0012]

As described in detail in the above embodiments, in the method for stopping water from an underground storage tank structure according to the present invention, the side groove as a clearance provided around the side wall is provided.
In an underground storage tank structure equipped with
The length of the groundwater seepage path toward the crushed stone layer can be easily increased , preventing the intrusion of the groundwater into the crushed stone layer more effectively, and the vertical shape formed by the narrow groove excavator without disturbing the ground A solidifying material such as a mortar for stopping water is poured into the excavation groove of the above, and the construction can be carried out economically without much labor and material.

[Brief description of the drawings]

1 (a) to 1 (c) are partial cross-sectional views showing a procedure for implementing a water stopping method according to the present invention.

FIG. 2 is an explanatory cross-sectional view showing an overall configuration of a conventional underground storage tank structure.

[Explanation of symbols]

 Reference Signs List 1 side wall 2 crushed stone layer 3 bottom plate 4 gutter 10 narrow groove excavator (chain cutter) 12 drill groove 16 water stop wall

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 58-98393 (JP, U) Japanese Utility Model Hei 1-98250 (JP, U)

Claims (1)

(57) [Claims] 1. A side wall constructed in the ground, a crushed stone layer disposed inside a bottom portion of the side wall, a bottom slab above the crushed stone layer and having a peripheral edge integrated with the side wall; In an underground storage tank structure provided with a gutter as a clearance part provided , water in the gutter is crushed stone at the bottom of the bottom plate.
A water stopping method for preventing sneaking into a layer, wherein the ground immediately below the side wall is excavated in a vertically elongated shape by a narrow groove excavator,
A method for stopping water in an underground storage tank structure, wherein a solidifying material such as a water stopping mortar or a water stopping concrete is poured into the excavation trench to form a continuous water stopping wall immediately below the side wall.