JPS6015772B2 - Underground unit box and its installation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underground unit box that is buried under the floor of a building and used as a water tank of the building, and a method for installing the same.

Traditionally, when installing a basement in a building, foundation work to support the underground part and waterproofing work to the underground part are required, and if necessary, piling work to support the underground part is also added, which not only significantly increases construction costs but also reduces construction time. There was an unavoidable drawback that the period was significantly prolonged. This invention has been proposed in view of the above circumstances, and is intended to shorten the construction period and reduce construction costs when installing a basement for a water tank or the like in a building.

The underground unit box according to the present invention is constructed by suspending the underground unit box from a floor beam of the building and burying it under the floor of a building.

There are two methods for installing the underground unit box according to the present invention. One is to form a hole of the required depth under the floor of the building to be constructed, and pour water into the hole. This is a method of floating an underground unit box, suspending and fixing the underground unit box to a floor beam of the building, and then draining the water in the hole and backfilling.

Another method is to construct a hole of the required depth under the floor of the building to be constructed, the foundation of the building, and an underground beam, and pour water into the hole and float the underground unit box therein. This method is completed by fixing the box to an underground beam of the building, then draining the water in the hole, and placing embankment or concrete around the outer periphery of the underground unit box. The present invention will be described below with reference to an illustrated embodiment. In FIGS. 1 and 2, reference numeral I designates an underground unit box used for a water tank in a building 2; It is buried in the building 2 and suspended from the floor beams 3, 3 of the building 2.

The underground unit box 1 is made of metal such as a galvanized steel plate and has a double structure consisting of an outer box 4 and an inner box 5, with the inner box 5 serving as a water tank. Further, an inner box 5 and a hatch 6 leading to the ground are formed in the underground unit box 1, and the inside of the underground unit box 1 can be entered and exited through this hatch 6. The floor beams 3, 3 on which the underground unit box is suspended are made of reinforced concrete or steel. In such a configuration, when installing the underground unit box, first construct the foundation 7 of the building 2 and the underground beam 14, and once this is completed, install sheet piles, metal sheet piles 8, etc. in the buried part of the underground unit box. ...
A substantially rectangular underground continuous wall is constructed by driving the holes, and a hole 10 is formed by excavating the inside of this underground continuous wall to a required depth using heavy excavating equipment 9.

Next, water is poured into the hole 10 to a required depth, and an underground unit box previously manufactured in a factory or the like is suspended into the hole 10 by a crane 11 and floated therein. Next, the floor beams 3, 3 for suspending the underground unit box 1 are installed by the crane 11 directly above the underground unit box 1, and the underground unit box is suspended from the floor beams 3, 3. When hanging the underground unit box, the level of the underground unit box 1 is adjusted by increasing the amount of water in the hole 10 or pouring water into the inner box 5 of the underground unit box 1. That is, when it is desired to raise the level of the underground unit box 1, the amount of water in the hole 10 is increased to float the underground unit box. Also,
When it is desired to lower the level of the underground unit box, water is poured into the inner box 5 to sink the underground unit box 1. When the installation of the underground unit box 1 is completed, the water in the hole 10 is drained, and the hole 10 is backfilled by pulling out sheet piles, metal sheet piles 8, etc. After the installation work of the underground unit box is completed, the floor 12 of the building 2 will be constructed, and then the construction of the frame on the ground floor will begin. Another method for installing an underground unit box is to construct a hole 10 of the required depth, a foundation 7, and an underground beam 14 under the floor of the building to be constructed, and pour water into the hole and move the crane 11 into the hole. The underground unit box 1 is suspended and floated, and the underground unit box is attached to the underground beam 1.
After that, the water in the hole is drained and the outer periphery of the underground unit box is covered with embankment or concrete.

After the installation work of the underground unit box 1 is completed, the excavated portion is backfilled and the floor of the building 2 is constructed, and then the construction of the frame on the ground floor begins. As described above, the underground unit box according to the present invention is as follows. Since it is suspended and buried from the floor beam or underground beam of the building, the foundation and support piles that support the underground unit box can be omitted, and the underground unit box can be manufactured above ground, and waterproofing work can be done above ground. Since it can be done in a short time, the construction period can be shortened and construction costs can be reduced.

Furthermore, according to the method for installing an underground unit box according to the present invention, there is no need for foundation work or piling work for the part that supports the underground unit box, and steel beams or RC beams can be used as the floor beams for suspending the underground unit box. Setting up a basement is extremely easy. In addition, by effectively utilizing the groundwater level, level adjustment can be easily made when installing the underground unit box.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and cross-sectional view of the building frame showing how the underground unit box is installed, and Figures 3 to 8, 9, and 10 are the order showing how to install the underground unit box. It is a diagram. 1. Underground unit box, 2. Building, 3. Floor beam, 4. Outer box, 5. Inner box, 6. Hatch, 7. Foundation, 8. Sheet pile or metal sheet pile.
9... Heavy excavation equipment, 10... Hole, 11... Crane, 12
・・Floor, 131・Anchor bolt, 14・・Underground beam. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Scope of Claims] 1. An underground unit box, characterized in that the underground unit box is suspended from a floor beam of the building and buried under the floor of the building. 2. Forming a hole of the required depth under the floor of the building to be constructed, pouring water into the hole, floating an underground unit box therein, and suspending the underground unit box from the floor beam of the building; A method for installing an underground unit box, characterized in that the water in the hole is then drained and the hole is backfilled.