JPS58767B2 - Construction method of underground continuous water-stop wall - Google Patents

Description

[Detailed description of the invention] The present invention relates to a construction method for an underground continuous water-stop wall.

The inside of the sheet pile revetment and casing, which has been commonly implemented in the past,
There is a risk that dirt and waste may be sucked out or washed away from the joints, etc.

In order to solve the above-mentioned conventional problems, this invention has developed an underground continuous wall with high water-stopping properties and high flexibility, which is installed along the revetment side of the revetment, such as steel sheet piles and steel pipe sheet piles.

The present invention will be described below with reference to examples. First, a boring machine 1 is installed on the ground, and a casing tube 2 is installed on the ground.
The soil inside the casing tube 2 is excavated and discharged using a hammer grab bucket 3, and the casing tube 2 is vibrated and press-fitted using a boring machine 1.

(See Figures 1 to 3) Next, inside the casing tube 2, there is a perforated pipe 4 and partition plates 5, 5 that divide the continuous wall into sections parallel to the thickness direction.
is inserted, and then asphalt precoated crushed stone 8°9 is charged into the hopper 6 installed at the upper end of the casing tube 2 using a grab bucket.

In this case, the central chamber between the partition plates 5, 5 is filled with large-grain asphalt pre-coated crushed stone 8, and the both side chambers are filled with small-grain pre-coated asphalt crushed stone 9.

Further, the casing tube 2 and the partition plates 5, 5 are pulled out while filling the asphalt precoated crushed stones 8, 9 inside.

(See Figures 4 to 6) The above operations are performed continuously or while lapping every other piece to form a continuous crushed stone multi-column wall.

Next, an asphalt-based material is injected from the asphalt pump 10 through the perforated pipe 4 to fill the gap between the asphalt precoated crushed stones 8 and 9, and this is continuously performed to form a continuous water-stop wall.

(See Figures 7 to 9) The present invention has the above-described configuration, and since excavation is carried out using the all-casing method, construction can be carried out without adversely affecting the bank protection structure.

In addition, since the asphalt-based material is injected at a high temperature of about 100° C., it can adhere to the asphalt pre-coated crushed stone even in water and become solid and integrated.

In addition, the constructed water-stop wall is interlocked with asphalt pre-coated crushed stones, and the gaps are filled with asphalt-based material, increasing the shear strength and reinforcing the seawall.

In addition, since the filling material is an asphalt-based material, it exhibits a unique viscoelastic property and has great flexibility, so it deforms plastically in response to uneven settlement or earthquakes, does not generate cracks, and has great water-stopping properties and stability.

Furthermore, a partition plate is used during the construction process, and the center part is filled with large-grain asphalt pre-coated crushed stone to make it easier to inject asphalt-based materials, and the sides are filled with small-grain asphalt pre-coated crushed stone. As a result, the thickness of the water-stopping wall becomes uniform, and no flow occurs due to the weight of the asphalt-based material even after a long period of time.

[Brief explanation of drawings]

Figure 1, Figure 2, Figure 3, Figure 4 A, Figure 5, Figure 6 A
, Fig. 7A, Fig. 8, and Fig. 9A are longitudinal sectional views showing the construction order, and Fig. 4B, C, Fig. 6B, Fig. 7B, and Fig. 9B are plan views. . 1... Boring machine, 2... Casing tube, 3... Hammer grab bucket, 4... Perforated pipe, 5... Partition Board, 6...Hopper, 7...Grab bucket, 8...Large particle size asphalt precoated crushed stone, 9...Small particle size asphalt precoated crushed stone, 10 ...Asphalt pump.

Claims (1)

[Claims] 1. Excavate permeable ground using a casing, then insert a perforated pipe and a partition plate parallel to the length of the continuous wall into the royal chamber, and insert large-grain asphalt pre-coated crushed stone into the central chamber. Filled with small-grain asphalt pre-coated crushed stone on both sides, then the casing and partition plates are pulled out to form a multi-column wall of pre-coated asphalt crushed stone, and asphalt-based material is injected through a perforated pipe. A construction method for underground continuous water-stop walls characterized by filling the gaps between crushed stones pre-coated with asphalt and integrating them.