JPH0396518A - Foundation form and foundation method using same - Google Patents

Abstract

PURPOSE:To reduce progress of work and to make it possible to execute at a low cost by laying and arranging U shaped foundation forms having openings to a plurality of bottoms of the inside of a pit excavated channel to form a form unit, and housing a reinforcement unit to place reinforcement, and placing concrete. CONSTITUTION:In concrete forms 1, coupling arms 4 and 5 higher in height are coupled with both sides of the lower party of two sheets of side wallboards 2, 3 rising in parallel in the shape of a U, openings 6 are formed on the bottoms, and holes 8 into which steel bars are inserted are bored in the upper parts of the side wallboards 2 and 3. The forms 1 are subsequently laid and arranged to the inside of a pit excavated channel so that the coupling arms 4 and 5 are brought into contact with each other, the perimeter is backfilled to couple adjacent forms 1 with each other trough joint piece metal fittings 10, and the form unit 11 is formed. After that, a reinforcement unit 13 is fallen into the form unit 11 to place reinforcement, anchor frames 12 are mounted to anchor bolts 14 to rise,and concrete is placed in the forms 11 to form foundation beams.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a precast concrete formwork used when constructing a building foundation, and a foundation construction method for constructing a building 1 using this formwork. A〈Conventional technology〉 Conventional building foundation construction methods generally involve placing (
A) Make a $1 cut, (B) Place concrete in the cut groove, (C) Arrange reinforcing bars in the groove and assemble the structure, (1)) Place mold around the reinforcing bars. Place the frame, (E) pour concrete into the formwork, (F) remove all the formwork around the concrete foundation, and (G) further backfill with earth and sand around the concrete foundation. Was. RM that this invention aims to solve > However, the above-mentioned conventional building foundation construction method requires extremely many steps and many INs before constructing the foundation, has a complicated work process, and requires a lot of construction work. The problem was that it took several days and was expensive. In particular, the conventional building foundation construction method mentioned above requires wide root cutting, which requires a large amount of money to dispose of the remaining soil, which is also in short supply these days! l! ! There were problems such as the need for a large number of trained reinforcing bar workers and formwork workers. The present invention relates to a completely new technique developed in view of these conventional problems.

<Means for Solving the Problems> The present invention is a technology developed to fundamentally improve the above-mentioned conventional problems, and the gist of the foundation formwork is to In the precast concrete formwork used, the lower sides of two side wall plates standing almost parallel to each other are integrally connected in a U shape by connecting arms, and an opening is provided at the bottom. ．． In addition, the gist of the foundation construction method using the foundation formwork is that a plurality of U-shaped foundation forms having openings at the bottom are sequentially laid down inside a cut groove to form a formwork unit, and the formwork This is a foundation construction method that uses a foundation formwork in which reinforcing bars are housed and arranged inside the unit, and concrete is then poured into the formwork unit to form the foundation beam.

Function> As described above, the foundation formwork according to the present invention is formed by integrally connecting the lower sides of the two side wall plates in a U shape with connecting arms, so the foundation formwork can be A formwork unit can be easily constructed by arranging a plurality of molds in a groove. In addition, connecting arms are provided on both sides of the bottom of the formwork, and there is an opening between them, so the lower reinforcing bars placed inside the formwork are held by the connecting arms, so that they cannot be cast inside the formwork. It is possible to reliably cover the reinforcing bars by filling the concrete to the bottom of the reinforcing bars. Furthermore, as mentioned above, the formwork according to the present invention has a large opening at the bottom, so it can be lightweight, and i! It can facilitate transportation and on-site work. In addition, the head of the foundation shaft cast underground can be exposed through the opening at the bottom, and workers can easily enter the opening when installing the formwork. As mentioned above, the foundation construction method according to the present invention allows the formwork units to be easily constructed by laying the formwork inside the cut groove. , and the outside of the formwork unit can be backfilled immediately after the formwork unit is installed.
There is no need to install a formwork or remove the formwork as in the past, and only a narrow cutout is required, so that the amount of waste Saturn can be significantly reduced.

Since the formwork UNINOTO of the foundation construction method according to the present invention is used for filling, it is possible to simultaneously place concrete for underground beams and concrete for the earthen floor, thereby reducing the number of times concrete is placed. can be simplified. <Example> An example of the foundation formwork according to the present invention will be specifically explained with reference to figures. Fig. 1 is a perspective explanatory view of the formwork, and Fig. 2 (A)
is a plan view of the formwork, and (B) and (C) are side views, respectively. In the figure, 1 is a precast concrete formwork of the present invention, and two side walls 2 and 3 are erected almost parallel to each other.
Connecting arms 4.5 with thin walls and high height on both inner sides of the lower part of the
It is constructed by integrally connecting in a U shape. Therefore, on the bottom of this concrete form I, there is a side wall plate 2.
．． 3 and a large opening 6 by the connecting arm 4.5.

This concrete formwork I may be formed of unreinforced mortar or concrete, or may be made of steel wire, stainless steel wire,
It is also possible to make the entire structure thinner by reinforcing it with carbon fiber, glass fiber, etc. to reduce weight. Additionally, if necessary, it is also possible to provide reinforcing ridges in designated areas or to make general areas thinner. Holes 8 through which steel rods 7 can be inserted are bored in the upper parts of the side wall plates 2.3 of this concrete formwork l. Therefore, when installing the concrete form l in the root cutting groove described below,
By suspending this steel rod 7, it can be easily transported and installed. Next, the foundation construction method according to the present invention will be explained using figures. Fig. 3 is a perspective view showing a state in which formwork is laid in a trench where roots have been cut, and Fig. 4 is a perspective view showing a state in which the area around the formwork is backfilled. Fig. 5 is a side view of the formworks arranged in parallel, Fig. 6 is a perspective explanatory view of the state in which adjacent formworks are connected, and Figs. 7 and 8 are the reinforcing bars attached to the formwork units. Figure 9 is a side view of the stored state, Figure 9 is a perspective view of a part of the corner, Figure 10 (A), ([1) and Figure 11 are of the corner formwork used for part of the corner of the formwork Uninote. It is an explanatory diagram.

In the foundation construction method of the present invention, as shown in FIG. 3, first, the formwork l having the above-mentioned structure is laid out in order inside the cut groove 9 so that the connecting arms 4.5 are in contact with each other. As shown in FIG. 4, the surrounding area is backfilled, and as shown in FIG. 6, the adjacent formwork l is interconnected with joint piece metal fittings IO, thereby forming a formwork unit 11 as shown in FIG. Construct. This formwork unit 1
As shown in FIG. 5, an anchor frame 12 is provided at the bottom of a part of a corner or an intermediate intersection. Next, as shown in FIGS. 7 to 9, the formwork unit ll
The reinforcing bars 3 assembled in a basket shape are dropped inside and stored. This reinforcing bar unit 7 3 consists of a straight line unit 13a and a crossing unit 13b, and by combining these at a predetermined position, it can be set to the left or right. Reinforcement can be placed in the front and back. Also, there is an anchor bolt on the anchor frame l2! 4 can be attached and stand up.

The above-mentioned reinforcing bar unit 3 can be manufactured in advance at a factory, thereby making it possible to omit the process of arranging and assembling reinforcing bars on site. In the above embodiment, a corner form 15 having an L-shaped cross section as shown in Figs. be. As mentioned above, after housing the reinforcing bar unit 13 in the formwork unit opening 1, concrete (not shown) is poured into this formwork unit 11 to complete the concrete foundation made of underground beams. Can be done. In the foundation construction method of the present invention, the formwork unit 1 is buried, so as mentioned above, after installing the formwork unit [1], the outer gap can be backfilled, and the soil floor concrete It becomes possible to perform work for Therefore, concrete placement for the pond beams and concrete placement for the earthen floor (not shown) can be performed at the same time. Also, the reinforcing bars dropped into the formwork
3 is supported by the upper edge of the connecting arm 4.5 of the formwork l, and an opening 6 is formed in the bottom of the formwork l, so that
The concrete placed in the formwork joints 1 is sufficiently filled up to the bottom of the reinforcing bar joints 3, thereby ensuring that the reinforcing bars are covered with concrete.

The formwork unit 11 in the above embodiment is the formwork for the pond beam, and is provided to secure the covering of the earthwork and reinforcing bars of the underground beam. As long as it is possible to insert and connect the reinforcing bars 13 of the beam, it is okay to have some unevenness in the horizontal direction, and as long as the height of the first floor earthen floor is maintained, it is okay to have some unevenness in the vertical direction. do not have. Therefore, the formwork unit Hl can be easily constructed even by an unskilled person.

Effects of the Invention> Since the foundation formwork according to the present invention has the structure and function described above, it can be mass-produced uniformly in a factory at low cost, and it is possible to carry out root cutting lessons on site. It is possible to easily construct a form unit by laying them side by side inside the concrete, and the opening at the bottom reduces the overall weight, making construction work easier, and ensuring that the reinforcing bars placed inside are covered with concrete. It has characteristics such as being able to do it.

Furthermore, since the foundation construction method according to the present invention has the above-described structure and operation, it is possible to backfill immediately after forming the formwork unit, and it is possible to use the formwork for forming the foundation unlike the conventional formwork. It is possible to eliminate the need for installing and removing formwork,
This method shortens the work process, allows quick and inexpensive construction, and also allows for the simultaneous pouring of concrete for underground and dirt floors.

[Brief explanation of drawings]

Figure 1 is a perspective explanatory view of the formwork, Figure 2 (A) is a plan view of the formwork, Figures (B) and (C) are side views, respectively, and Figure 3 shows the formwork being installed in the cut groove. Perspective view showing the state where they are laid out, No. 4
The figure is a perspective view of the state in which the surroundings of the formwork have been backfilled, FIG. 5 is a side view of the state in which the formworks are arranged in parallel, FIG. Figure 8 is a side view of the reinforcing bars stored in the formwork 1, Figure 9 is a perspective view of the corner, and Figures 10 (A) and (B).
and FIG. 11 is an explanatory diagram of a corner formwork used for a part of the corner of the formwork unit. 1 is a concrete formwork, 2.3 is a side wall plate, 4.5 is a connecting arm, 6 is an opening, 7 is a steel rod, 8 is a hole, 9 is a cut groove, 10 is a joint piece, 11 is a formwork unit ,1
3 is the reinforcing bar unit, l4 is the anchor bolt, and l5 is the corner formwork.

Claims (2)

[Claims] (1) In the precast concrete formwork used when constructing the building foundation, the bottom sides of two side wall plates that are erected almost parallel are integrally connected in a U shape with connecting arms, and the bottom A foundation formwork characterized by having an opening. (2) Inside the cut groove, a plurality of U-shaped foundation forms with openings at the bottom are laid one after another to form a formwork unit, and a reinforcing bar unit is housed in the formwork unit to arrange the reinforcement. , and a foundation construction method using a foundation formwork characterized by constructing a foundation beam by pouring concrete within the formwork unit.