JPS63315734A - Construction of basement in existing building - Google Patents

Abstract

PURPOSE:To raise the efficiency of operations by a method in which panels for basement are floated on groundwater in a space for basement. and settled down by injecting groundwater into the panels, the wall of the ground is connected with the panels by cement, and water in the panels is drained. CONSTITUTION:A space 2 for basement is excavated in an existing building 1, and a frame assembly 3 is temporarily set on the upper part of the space 2. A beam assembly 5 is set on the frame assembly 3 and a bottomed box-type basement panel 8 consisting of a floor panel 6A, columns 7, and waist-high wall panels 6B is fabricated. The panel 8 is lowered by crane 10 into groundwater W in the space 2 to float it, and the groundwater W is injected into the panel 8 by a pump 11 to settle it down. After the panel 8 is landed on the bottom, the wall of the space 2 and the outside of the panel 8 are bonded with cement C. The water W in the panel 8 is drained to the outside by a pump 11.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a method of installing a
The present invention relates to a method of constructing a basement in an existing building in which the basement is constructed later.

[Prior art]

Constructing a basement inside an existing building built in an area with a high groundwater level means that the construction equipment that will be brought into the existing building will be subject to size and weight restrictions, making it impossible to bring construction equipment into the building. When the basement space of an existing building is excavated, the space is filled with groundwater, making it impossible to assemble basement panels in the water. The reality is that there are almost no such cases.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for constructing a basement in an existing building, which solves the above-mentioned conventional problems and allows efficient manual construction of a basement in an existing building located at a high groundwater level.

[Structure of the invention]

The method of constructing a basement in an existing building according to the present invention to achieve the above object is to excavate a basement space in an existing building built in a high groundwater level area, and temporarily assemble it above the basement space. After assembling a bottomed box-shaped basement panel consisting of beams, floor panels, columns, waist wall panels, etc. on a framework of wooden beams, etc., the above-mentioned basement panel is placed into the groundwater in the basement space using an indoor crane, etc. The groundwater is then pumped into the basement panel and allowed to settle. After bonding the ground wall of the basement space and the basement panel with cement, the water inside the basement panel is pumped. This feature is characterized in that the basement panel is fixed within the basement space of an existing building by draining water.

According to the above method, it is possible to efficiently construct a basement by human labor using only construction equipment that can be carried into an existing building, and leakage of groundwater is stopped with cement outside the basement panel.

〔Example〕

An embodiment using the basement construction method of the present invention will be described below with reference to the drawings.

First, as shown in the plan view in Figure 1 and the side sectional view in Figure 2, when constructing a basement in an existing building 1 built on land with a high groundwater level, a basement A space 2 is excavated by an appropriate means, and a framework 3 made of a large number of wooden beams called grouper boards with dimensions that can be carried into the existing building 1 is sequentially installed on the top of the basement space 2 as shown in Figure 1 for scaffolding. Assemble temporarily.

Incidentally, since the individual dimensions of such a framework 3 are short in order to facilitate carrying in and out, the frame 3 can also be used by assembling it to a required length using joint materials 4.

Next, a beam assembly 5 made of steel or the like is arranged on the framework 3 as shown in FIG. 1, and as shown in FIG. The basement panels 8 are assembled manually.

After the basement panel 8 is assembled, the basement panel 8 is added to the groundwater W in the basement space 2 in a third place.
Indoor crane l installed on crane girder 9 shown in the figure
As shown in Figure 4-A using
By injecting groundwater W into the basement panel 8 using the pump 11 as shown in Figure 4-B, the basement panel 8 is allowed to settle, and after reaching the bottom, the basement space 2 is expanded as shown in Figure 4-C. The ground wall and the outside of the basement panel 8 are bonded with cement C, and as shown in Figure 4-D, the groundwater W in the basement panel 8 is discharged to the outside with a pump 11, and the cement C is solidified. For example, it is fixed to the basement panel 8 or the basement space 2, and the interior work is then performed to complete the basement.

〔Effect of the invention〕

If the basement construction method of the present invention explained above is adopted,
It is now possible to construct a basement later in an existing building built in a place with a high groundwater level, and in particular, basement construction equipment that can be carried into an existing building allows for efficient construction of a basement by hand. This has the advantage that the construction cost is low.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the state when constructing a basement using the basement construction method of the present invention, Fig. 2 is a side sectional view for explaining Fig. 1, and Fig. 3 is a step following Fig. 2. The side sectional view, Figure 4-A, Figure 4-B, Figure 4-C, and Figure 4-D are a series of main parts showing the procedure of basement construction work to be carried out following Figure 3. FIG. 1... Existing building, 2... Basement space, 3... Frame, 8... Basement panel, 11... Pump, C.
...Cement, L...groundwater level, W...groundwater.

Claims (1)

[Claims] Excavating a basement space within an existing building located at a high groundwater level;
After assembling a bottomed box-shaped basement panel on the framework temporarily assembled above the basement space, the basement panel is floated on the groundwater in the basement space, and the groundwater is transferred to the basement panel. A method of constructing a basement in an existing building, in which water is poured into the basement and allowed to settle, and after bonding with cement between the ground wall of the basement space and the basement panel, the water for the basement panel is drained.