JPH073821A - Construction of footing beam and earthen floor slab on bearing slab foundation concrete - Google Patents

Abstract

PURPOSE:To eliminate accuracy of fittings and removal of a form (inside), a ceiling form and a support in a conventional construction method, at the same time, contribute to the accuracy of beam size and to reduce greatly a construction period and the number of building materials. CONSTITUTION:A plurality of rectangular plastic boxes 1 are arranged and fixed at intervals by width size of a footing beam B, and reinforcing bars 2 are arranged to the surroundings and upper surfaces of the plastic boxes 1. In addition, forms (outside) 3 are so fitted that the surroundings of the whole are surrounded. Intervals between the forms (outside) 3 and boxes 1 are respectively bolted to connect every required pitch so that each of the intervals reaches width width size of the footing beam B and, at the same time, an interval between the boxes 1 and 1 is connected with a proper connector 4 every required pitch. Concrete is placed until it reaches a level of thickness of an earthen floor slab C from the upper surface of the box 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground girder and an earth slab on concrete of a pressure board.

[0002]

2. Description of the Related Art A conventional method of constructing an underground girder and an earth slab on a pressure plate foundation concrete is as shown in FIG.
Specifically, when the form (outer) 1 and the form (inside) 2 are combined, the form (inside) 2 is used, and when the form (inside) 2 and the form (inside) 2 are combined, one is used. Of the mold (inside) 2 is built, and then the reinforcing bar 3 is arranged around it, and then the remaining form (outside) 1 or the form (inside) 2 is covered so as to conceal the reinforcing bar 3. Building, and then placing concrete to construct an underground beam B, then supporting the ceiling formwork 4 by supporting it with the support 5 and arranging it on the ceiling formwork 4, in which case the manhole opening H
Was secured and the concrete was placed to construct the soil slab C. And when the concrete is dry, the formwork (outside)
1, the formwork (inside) 2, the ceiling formwork 4, and the supporting structure 5 were removed. The form (inside) 2, the ceiling form 4, and the support 5 were carried out through the opening H for the manhole, and the opening H was closed by placing concrete in the opening H and then placing concrete.

[0003]

In the conventional construction method, it requires skill to build the form (inside), the ceiling form, and the support work, and the removal is an extremely hard work, which requires a long construction period. I also needed a lot of materials. Closing the manhole opening was also a cause of the longer construction period.

The present invention has been devised in view of the above-mentioned points. It is possible to eliminate the construction / removal of the form (inside), the ceiling form, and the supporting work in the conventional construction method, and to make the beam dimension accurate. The purpose of the present invention is to provide a method of constructing an underground beam and an earth slab on concrete of pressure board foundation, which contributes to the construction and can significantly reduce the construction period and the number of materials.

[0005]

As a means for solving the above-mentioned problems, the present invention provides pressure plate foundation concrete A
A plurality of rectangular parallelepiped plastic boxes 1 having at least four side surfaces and an upper surface portion are arranged at intervals with a width dimension of the underground beam B, and the plastic boxes 1 are a pressure board foundation. Secure it to concrete A with anchor bolts U,
Reinforcing bars 2 are arranged around and around each plastic box 1, and a mold (outer) 3 is built so as to surround the entire circumference thereof, and the intervals between the mold (outer) 3 and the box 1 are set, respectively. Bolts are connected at required pitches so that the width dimension of the underground beam B is achieved, and appropriate connection is performed so that the space between the boxes 1 and 1 is maintained at the width dimension of the underground beam B secured at the time of installing the boxes. It connects by the tool 4 for every required pitch, and after that, from the upper surface of the box 1 to the level which becomes the thickness of the earth slab C, between the form (outer) 3 and the box 1, between the box 1 and the box 1, and the box Concrete is cast on the upper surface of 1, and the form (outer) 3 is removed after the concrete is dried and solidified, and the plastic box 1 is left buried. It provides a way to build a dirt slab.

[0006]

[Embodiment] An embodiment of a method for constructing an underground beam and an earth slab on concrete of a pressure board foundation according to the present invention is shown in FIGS.
Will be described with reference to. First of all, a rectangular parallelepiped plastic box 1 having an upper surface portion, a lower surface portion and four side surface portions is ground on a pressure plate foundation concrete A in which roots are cut and laid with crushed stones 5 and rebars 2 are laid and concrete is placed. Anchor bolts U
Fix it to the concrete foundation A of the pressure plate. In this embodiment, the four plastic boxes 1, 1, 1, 1 are arranged so that the shape of the underground beam B becomes the shape of "T". The plastic box 1 is fixed to the pressure plate foundation concrete A by passing an anchor bolt U through a mounting hole of an L-shaped fixture 1b attached to the lower end of the side surface of the plastic box 1. Next, the reinforcing bars 2 are arranged around the plastic box 1 (including the space between the boxes) and the upper surface, and a form (outer) 3 is built so as to surround the entire circumference. Since the formwork (outside) 3 is not fixed to the building, the formwork (inside) is not built. Instead, the space between the formwork (outside) 3 and the box 1 is connected by bolt connection from the plastic box 1 to the underground beam. Secure so that it has the width dimension of B. For example, as shown in FIG.
The nut seat 1a, which has been plastic-welded in advance to the side surface of the plastic box 1, has a stud screw 6 which is passed through a bolt through hole 3a formed in the mold (outer) 3 from the outside of the mold (outer) 3. The tip end is screwed, the rubber seal member 7 is applied to the base end of the stud screw 6, the bolt through hole 3a of the form (outer) 3 is closed, and the wing nut 8 is tightened. Further, the plastic boxes 1 and 1 are connected to each other so that the space between the boxes 1 and 1 which is secured at the time of installing the boxes does not become wider than the width of the underground beam B due to the pressure of placing concrete. . For example, FIG. 2 (b)
As shown in FIG. 5, the U-shaped connecting tool 4 is connected to the connecting portions 1c, 1c provided on the side surface of the box 1 by plastic welding in advance with the connecting tool mounting rod T at a required pitch. After that, when ready-mixed concrete is placed between the formwork (outer) 3 and the box 1 and the placement of the ready-mixed concrete in the underground beam B portion is completed, the level at which the thickness of the soil slab C becomes the upper surface of the box 1 Until ready-mixed concrete is placed. When the concrete has dried to dryness, the form (outer) 3 is removed, and the construction of the underground beam B and the earth slab C is completed, and the plastic box 1 remains buried.

The plastic box need not have a bottom portion. When the vertical and horizontal span of the underground beam B is large,
Since the strength of the upper surface of the plastic box 1 is insufficient, reinforcing ribs are provided. Alternatively, a manhole may be attached to the upper surface of the plastic box 1 and a trap may be provided to use the inside of the plastic box 1 as an underground warehouse. further,
It is also possible to store water in the box and use it as a fire protection water tank in an emergency.

[0008]

As described above, according to the method of constructing the underground beam and the earth slab on the concrete of the pressure plate foundation of the present invention, the formwork (inside), the ceiling formwork in the conventional construction method, Instead of installing and removing the support work, multiple rectangular parallelepiped plastic boxes are arranged and fixed at intervals with the width of the underground beam, so it requires skill to build and remove them. However, the work of building the formwork, which is extremely difficult, can be done only on the formwork (outside), and the construction period and the number of materials can be greatly reduced. And since we will build on the plastic box, we only need to manufacture the plastic box to the exact size in the factory, and fix it in the correct array.
The form (outside) can be built accurately and easily without the need for skilled workers, and the accuracy of street and width dimensions of the underground beam as well as the verticality of the beam can be obtained, and the bottom of the soil slab The level is also accurate, and if the thickness of the soil slab is concrete-placed according to the design dimensions, the level of the soil slab can be accurately obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main part of an underground beam and an earth slab constructed on a pressure plate foundation concrete by carrying out a method of constructing an underground beam and an earth slab on the pressure plate foundation concrete of the present invention.

FIG. 2 is a top view of FIG. 1 before placing concrete.

3 (a) is a detailed view showing a state in which a box and a mold (outer) are connected by bolting after reinforcing bars according to the implementation of the method of FIG. 1, and FIG. 3 (b) is implementation of the method of FIG. FIG. 4 is a detailed view showing a state in which the boxes and the boxes are connected to each other after the reinforcing bars of FIG.

FIG. 4 is a vertical cross-sectional front view of main parts of an underground beam and an earth slab constructed on a pressure plate foundation concrete by carrying out a method of constructing an underground beam and an earth slab on a conventional pressure plate foundation concrete.

[Explanation of symbols]

 A: Pressure-resistant board basic concrete, B: Underground beam, C: Dirt slab, U: Anchor bolt, 1 ... Plastic box, 2 ... Reinforcing bar, 3 ... Mold Frame (outside), 4 ...

Claims (1)

[Claims] 1. A plurality of rectangular parallelepiped plastic boxes, which have at least four side surfaces and an upper surface, are arranged on a concrete foundation of a pressure board at an interval of the width of the underground beam, and the plastics are arranged. The box is fixed to the concrete foundation of the pressure board with anchor bolts, reinforcing bars are arranged around and around each plastic box, and a form (outer) is built so as to surround the entire periphery of the box. Outer) and the box are connected by bolts at required pitches so that they are the width of the underground beam, and the space between the boxes is maintained at the width of the underground beam secured when the boxes are installed. As shown in the figure, connect them at the required pitch with an appropriate connecting tool, and then, from the top surface of the box to the level where the thickness of the dirt slab is reached, between the formwork (outer) and the box, between the boxes and between the boxes. Place concrete on the concrete A method of constructing an underground beam and an interstitial slab on concrete of pressure board foundation, characterized in that the mold (outer) is removed after the toughness has dried up, and the plastic box remains buried.