JPH01210521A - Building method and framing board of buried concrete structure - Google Patents

Abstract

PURPOSE:To shorten the term of construction by bringing a plurality of rectangular concrete framing boards in a recessed part of the ground, coupling short sides of the framing boards each other with a coupling metal fittings, backfilling earth to the outside of a framing body, and placing concrete into the frame body. CONSTITUTION:Ground surface 17 is excavated to form a recessed part 18 and a recessed part 20 thereunder, and after laying cobblestones 22 to the bottom of the recessed part 20, a leveling concrete layer 23 is placed. Then, a framing body 7 is formed on the concrete layer 23, and after backfilling earth to the outside of the framing body 7, concrete is placed into the framing body 7. After that, cobblestones are laid to the bottom of the recessed part 18, and after placing leveling concrete, a framing body 7a is frame on the concrete. In addition, after backfilling earth to the outside of the framing body 7a, concrete is placed in the framing body 7a, and is hardened to form a double foundation.

Description

DETAILED DESCRIPTION OF THE INVENTION A field of industrial application - The present invention relates to a method for constructing a concrete structure buried or semi-buried underground, and a temporary frame used in the method. The present invention relates to a method and frame suitable for constructing the foundation of a building or forming a reinforcing layer on the back of a retaining wall block.

1. Conventional technology and problems - When constructing a concrete structure by pouring concrete into a formwork framed on site, plywood or steel plates are conventionally used as frame plates, and after the concrete hardens, the plywood or steel plates are removed. If the structure to be constructed is a buried structure, the frame plate cannot be removed if the recess created for burying the concrete structure is backfilled with soil first, so the frame plate must be removed. After that, the soil will be backfilled. Therefore, it is not possible to backfill with soil until the concrete hardens, making construction work time-consuming.

In particular, as shown in Figure 14, a foundation 16 constructed by two-stage concrete pouring (hereinafter referred to as "two-stage foundation"),
As shown in Fig. 15, in the case of a block retaining wall 26, etc., which is piled up while solidifying the back of each level with concrete, the lower level 3
Since the upper stage 35 cannot be constructed until after the frame board used to construct 4 has been removed and the soil has been backfilled,
It takes a lot of time, and there is even a risk that the slope 27 behind the retaining wall will collapse.

In order to avoid such an extension of the construction period, when plywood is used as a frame board, in rare cases the plywood is buried in the soil as is, but after the plywood corrodes, there is a gap between the concrete structure and the soil. Due to the risk of leaving gaps, this method has not been approved as an official construction method.

On the other hand, as a method for constructing a foundation of a certain shape, for example, a rectangular cylindrical concrete block with the external shape of the foundation is formed, the block is installed on the site, and concrete is poured into it. A method of burying it is known. However, this method can only be used when the foundation to be constructed is small; it is not possible to construct long structures or structures that extend as a surface, and it is expensive to manufacture and transport the blocks. There is a problem with this.

Problems to be Solved by the Invention - Therefore, when constructing a buried concrete structure, this invention aims to backfill soil around the structure before the concrete in the formwork solidifies, and to Structures can be formed, structures of different shapes and sizes can be constructed using a single frame plate, and the frame plates used to form the formwork can be manufactured and transported easily and therefore economically. The object of the present invention is to provide a construction method that can be implemented and a frame plate used in the construction method.

Means for Solving the Problem - The method of the present invention involves excavating the ground surface 17 to form a recess 18.20, and forming a rectangular concrete frame plate with a connecting fitting attachment part 4 on the short side 2 in the recess. 1. Bring in multiple sheets of 6. Connecting metal fittings 6.
8. Connect the short sides 2 with lO to form a frame 7.7a, backfill the outside of the frame with soil, and pour concrete into the frame to harden it to form a frame 7.7a that is integral with the frame. It is used to construct concrete structures. If the structure to be constructed is tall, a rectangular concrete frame plate 1a is provided with a shallow recess 5 on its long side 3, and a plurality of short sides 2 of the frame plate are connected to each other. The frame body 7 is stacked vertically via the mating fittings 14 fitted into the recesses.
form b.

The frame plate used in the above method is a rectangular concrete frame plate 1 having a connecting fitting attachment part 4 on the short side 2, or has a fitting fitting insertion recess 5 on the long side 3 together with the connecting fitting attachment part. A concrete frame plate 1a is used.

Rectangular concrete frame L1a equipped with one-acting chain fitting attachment part 4
is transported to the site where the buried concrete structure 16.26 is to be constructed, and connected to the desired frame 7 using the connecting fittings 6.8 and IO.
．． 7a and 7b are formed, and concrete milk is poured into the frame to construct a concrete structure 16.26. Unlike conventional frame plates, there is no need to remove them after the concrete hardens, so after backfilling with soil, the frame 7.7a,
Concrete milk can be poured into 7b so that the structure to be stacked can be formed before the concrete hardens.

One Embodiment - Figures 1 and 2 show an embodiment of a frame plate according to the present invention, in which 1.1a is a rectangular frame plate made of concrete, 2 is a short side of the frame plate, 3 is a long side of the frame plate, 4 is a bolt insertion hole formed on the short side 2, and 5 is a recess formed on the long side 3. Such a frame plate 1.1a has a thickness of about 30 m+*, and a reinforcing wire mesh is embedded therein. Practical frame plates have a vertical length of 300 to 500 mm and a horizontal length of 600 to 1200 mm, and various sizes are prepared, for example, in 100 mm increments.

To build the base of the shape, as shown in Figure 3.4,
Four frame plates 1...1 having the same shape are abutted at right angles to each other at both corners, and the abutting portions are interconnected with L-shaped bolts 6 to form a frame body 7. Figures 5 and 6 are
This figure shows another connection structure between frame plates and the connection fittings used therein, in which an L-shaped connection plate 8 is attached from the outside and fixed with bolts 9 inserted into bolt insertion holes 4 of frame plate L. It is something.

To construct a beam-shaped foundation (for example, an underground beam), as shown in Fig. 7, the frame plates l...1 are arranged in a vertical direction, and the U-shaped bolts 10 and steel plates 1) shown in Fig. 8 are connected. The frame plates are connected to each other so that a series of side walls 12.12 face each other, and this side wall 12.1
A support beam 13 is inserted between the two to form a frame body 7a.

When it is desired to form a tall frame 7b, as in the case of constructing the rear part of a retaining wall, as shown in FIG. The frame plates 1a, . . . 1a are connected in the width direction by metal fittings 10, 1), and a mating metal fitting 14 shown in FIG. The matching fitting 14 has blade portions 14a bent vertically alternately.
, 14b sandwich the upper and lower frames Fi1a, 1a, so that the upper and lower frame plates can be stacked without any misalignment. FIG. 1θ shows a longitudinal cross-sectional view of the frame plates 1a stacked together using these mating fittings.

Next, the construction method of the present invention will be explained using the case of a two-stage foundation shown in FIG. 12 as an example. First, the ground surface 17 is excavated to form a recess 18, and the area where the foundation 19 is to be placed is further excavated to form a lower recess 20. Next, after laying split stones 22 on the bottom of the recess 20, a leveled concrete layer 23 is placed, and a frame 7 shown in the third figure is framed on top of it, and soil is backfilled on the outside of the frame ( Figure 12(b)). After pouring concrete into this frame 7,
Similar to the recess 20, cracked stones are laid on the bottom of the recess 8, leveled concrete is poured, and a frame 7a shown in FIG. 7 is framed on top of this. Then, after backfilling the outside of the frame 7a with soil, the support bars 13 are removed while pouring concrete into the frame 7a (Fig. 12(C)). When the concrete hardens, a two-stage foundation 16 as shown in FIG. 12 is formed.

As a second embodiment of the method of this invention, a method for constructing a retaining wall 26 will be explained based on FIG. 13. Retaining wall blocks 31 are stacked at predetermined intervals in front of the carved slope 27, and the slope 27
A frame 7b shown in FIG. 9 is placed between the block 31 and the frame 7b. After stacking the blocks 31 and frame 7b to an appropriate height,
Concrete is poured between the frame 7b and the block 31, and at the same time, split stone 30 is filled between the frame 7b and the slope 27 (FIG. 13(a)). Reference numeral 29 denotes a support bar inserted between the frame body 7b and the slope 27, and this support bar is removed when filling the split stone 30. The above operations are repeated to form the retaining wall 26 of a predetermined height.

Effects of the Invention - In the construction method of claim 1 or 2, when constructing a buried concrete structure, it is possible to backfill with soil or split stone before the concrete in the frame solidifies, and the structure at the lower level is solidified. Since the upper structure can be formed before the construction, the construction period can be significantly shortened.

In the frame board according to claim 3 or 4, the frame body can be formed integrally with the cast-in-place concrete 1, and can be buried as is without corroding like a plywood board. Furthermore, structures of different shapes and sizes can be constructed using a single frame plate, and since the frame plate is flat, it is easy to manufacture and transport the frame plate, and therefore it can be carried out economically.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of the first and second embodiments of the frame plate of the present invention, and Figure 3 is a perspective view of a frame for building a foundation formed of the frame plate of the second invention. ．． Figures 4 and 5 are partial cross-sectional views showing the connection structure between frame plates; Figure 6 is a perspective view showing an example of connecting fittings; Figure 7 is a perspective view of a frame for constructing underground beams; Fig. 8 is a partial sectional view showing the connection structure between the frame plates of the frame, Fig. 9 is a perspective view showing the frame formed by connecting the frame plates of the retaining wall vertically and horizontally, and Fig. 10 is the frame. Figure 1) is a perspective view showing the fittings, Figure 12 is a perspective view of a two-stage foundation and an explanatory diagram showing its construction method, Figure 13 is construction of a retaining wall. It is an explanatory diagram showing a method. FIG. 14 is a perspective view of a two-stage foundation, and FIG. 15 is an explanatory diagram showing a retaining wall in the middle of being constructed by conventional means. In the figure, 1.1a: Frame plate 2: Short side 3: Long side 4: Bolt insertion hole 5: Recess
6: L-shaped bolt? , 7a, 7b: frame body
8: Connecting plate 9: Bolt 10: U-shaped bolt 1): Steel plate 14: Matching metal fittings 17:
Ground surface 18: depression

Claims (4)

[Claims] (1) Excavate the ground surface (17) to create depressions (18) and (20)
), and a plurality of rectangular concrete frame plates (1), (1a) each having a connecting fitting attachment part (4) on the short side (2) are carried into the recess, and connecting fittings (6), ( 8) and (10) connect the short sides (2) to each other to form frames (7) and (7a), backfill the outside of the frame with soil, and pour concrete into the frame. A method for constructing a buried concrete structure, which comprises solidifying and constructing a concrete structure (16) integral with the frame. (2) A rectangular concrete frame plate (1a) is provided with a shallow recess (5) on the long side (3), and the plurality of short sides (2) of the frame plate are connected to each other and fitted into the recess. The method of constructing a buried concrete structure according to claim 1, characterized in that the frame (7b) is formed by stacking the frames (7b) vertically via the mating fittings (14) that are attached. (3) A frame board for constructing a buried concrete structure, consisting of a rectangular concrete frame board having a connecting fitting attachment part (4) on the short side (2). (4) A frame plate for constructing a buried concrete structure according to claim 3, wherein the rectangular concrete frame plate has a recess (5) for fitting fittings on the long side (3).