JPS5955920A - Construction of water collection well - Google Patents

Abstract

PURPOSE:To prevent the collapse of the wall of excavated pit by a method in which sponge is attached to whole peripheral surface of each of liner plates, and the liner plates are assembled. CONSTITUTION:After the ending of excavation for one liner plate section, liner plates whose periphries are bonded with a sponge of a thicknss larger than an extra-excavation width are assembled. These operations are repeated. Since the thickness of the sponge is larger than the extra-excavation width, it follows that the sponges come to press the wall face along the undulatory surface shrunk between the liner plates assembled while pushing toward the outside slightly and the wall face of the excavated pit, thereby preventing the collapse of the wall face. Since the sponges have a high water permeability, no trouble occurs with the permeation of water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a water collection well constructed at a collapsed site or above ground.

Generally, water collection wells are constructed by repeated drilling and liner plate assembly. However, the so-called over-excavation area between the excavated wall surface and the liner play 1 is not backfilled. Currently, backfilling is not performed in the upper half of the area where it is not required because it is technically difficult.

Because backfilling is not carried out, the excavated wall collapses, and the collapsed earth and sand creeps into the valve being worked on from the bottom of the liner plate, hindering the progress of the work. Sometimes, during construction, the ground around the base of the water collection well may cave in and cause the water collection well to tilt.

The object of the present invention is to eliminate these drawbacks of conventional drainage well construction methods.

To explain this in detail, a sponge thicker than the extra digging width is pasted on the entire outer periphery of each liner plate. Then, by assembling it, it becomes a backfilled state,
In this method of constructing a water collection well to protect the excavated wall surface, after the excavation for one section of the liner plate is completed, the liner plate is assembled by pasting a sponge thicker than the extra excavation width on the outer peripheral surface of each liner plate. In this case, extra digging +1
Since the sponge is thicker than 1, press the liner plate slightly outward to assemble. The sponge then contracts freely and presses against the excavated wall along the unevenness of the excavated wall.

By repeating the following steps of drilling and assembling the liner plate with the sponge attached, a water collection well of the planned depth is constructed.

Since the water collection well is constructed in this way, the No.
3. The excess excavation area is filled with sponge and the excavated wall surface is pressed by the sponge, so the excavated wall surface does not collapse.

Furthermore, the sponge attached to the liner plate also helps prevent soil from being sucked out through the water collection holes drilled in the liner plate.

Note that the sponge has high water permeability, so there is no problem with water passing through it, and it does not prevent water from entering the fresh water valve.

Patent applicant Hiroshi Utsunomiya

Claims (1)

[Claims] A method of constructing a water collection well by attaching sponge to the entire outer periphery of each liner plate and assembling them.