JPH063881Y2 - Concrete formwork for concrete foundation construction - Google Patents

Description

TECHNICAL FIELD The present invention relates to a concrete formwork used for constructing a concrete foundation.

Conventional technology and its drawbacks Conventionally, in order to construct a concrete foundation, after leveling the installation position, a stable board is placed with concrete, and after curing, a wooden board or metal plate formwork is used. After assembling, incorporating reinforcing bars and the like into the mold, raw concrete was put into the mold to form a foundation, and after curing and solidification, the mold was removed and the stabilizer was backfilled.

As mentioned above, conventionally, on-site formwork assembly,
Since it was necessary to remove the formwork after curing and solidifying the poured ready-mixed concrete, on-site work was very troublesome and required a lot of time, and the ratio of the formwork handling time to the on-site work time was compared. However, there is a drawback in that the fare required for round-trip transportation between the material warehouse of the formwork and the site and the labor cost required for the work in process on the site are high.

In addition, when urgent construction of disaster prevention facilities is required, or when constructing buildings in places with severe geographical and climatic conditions such as mountainous areas, it is required to build a foundation for the shortest possible time. It was difficult for the construction method using a formwork to meet the above requirements in terms of construction period.

Technical problem to be solved In view of the above points, the present invention manufactures a reinforced concrete formwork in a factory, transports it to a foundation construction site, and installs it.
By using this as an installation standard and support member for the reinforcing member of the foundation, and after adding concrete, the mold is integrally joined to the foundation by curing and solidification to form a part of the foundation so that It is an object of the present invention to provide a concrete formwork for constructing a concrete foundation by eliminating the work of removing the formwork after the assembling and the placing of the foundation concrete, and reducing the freight and labor cost and the construction period significantly.

Means for Solving the Problems In order to solve the above-mentioned problems, in the present invention, firstly, a form is formed of reinforced concrete into a rectangular tube shape or a cylindrical shape, and ready-cast concrete can be poured into the interior of the formwork to make a foundation. . Secondly, a reinforcing rib protruding inward from the inner wall surface of the mold is provided. Thirdly, the ribs also serve as spacers for setting the covering thickness of the reinforcing bars arranged in the concrete foundation during use.

Action The rib projectingly provided on the inner peripheral surface of the mold eliminates a weak point against the tensile force of the concrete wall and secures the pressure resistance against the concrete to be poured. Further, the covering thickness of the reinforcing bar of the base formed in the mold by the ribs can be easily and surely set. Further, when the ready-mixed concrete put into the mold is cured and solidified, the mold is integrally joined to the foundation to reinforce it.

Embodiment of the Invention Next, an embodiment of the invention will be described with reference to the drawings in the order of steps of a lathe example in which a concrete foundation is constructed using a mold according to the invention.

[First Step] (Form Making) The reinforced concrete form according to the present invention is first made in a factory in advance as a preliminary step for constructing a concrete foundation. The method of manufacturing this formwork is the same as the conventional method, and as shown in FIG. 1, the formwork 1 and 2 made of metal plates or wooden boards inside and outside are used to reinforce the formwork in a lattice shape. After setting the reinforcing bar 3 so that it is located in the center of the mold, concrete is poured into the molds 1 and 2 for curing, and after solidification, the mold is removed, and as shown in FIG. A reinforced concrete formwork A is manufactured.

The form A is formed into a polygonal cylindrical shape or a cylindrical shape depending on the appearance of the foundation, the shape of the building provided on the foundation, or the position of connection with the underground beam.
Near the corners of the reinforcing bars 3 or in the case of a cylindrical form, a suspension ring 4 extending upward is preliminarily joined at a symmetrical position with respect to the center of the cylinder, and the suspension ring 4 is produced after the concrete form is manufactured.
Are projected from the form A.

Further, as shown in FIG. 2, the concrete form A is
Ribs 5 that project from the inner wall surface and in which the horizontal bars that are a part of the reinforcing bars 3 are embedded are provided at appropriate intervals in the height direction of the mold. As will be described later, the rib 5 firstly reinforces the strength against the force in the direction perpendicular to the wall surface of the mold A itself, and increases the pressure resistance against the concrete flowing into the mold. Secondly, to secure, and secondly, to determine the covering thickness of the reinforcing bars and anchors of the foundation provided in this formwork (the thickness of the concrete that is put into the formwork to cover the reinforcing bars). It is provided to perform the function.

[Second Step] (Form Transfer / Site Installation) When constructing a concrete foundation, the concrete form A is transferred to a foundation construction site by a transfer device and installed at a predetermined position.

Since the form A has the suspension wheels 4 as described above, as shown in FIG. 3, the hooks 7 fixed to the ends of the wire ropes 6 are hooked on each suspension wheel 4, and the ropes are fixed on the crane or on the vehicle. Raise and lower with a crane, helicopter, etc.,
The formwork can be easily loaded and unloaded on a truck or other transfer device and transferred to the site. Further, it can be easily installed at a predetermined position even on site.

In order to install at a predetermined position on the foundation construction site, the position is leveled if necessary, and the form A is installed at a predetermined direction and level there. Normally, a reinforced concrete stabilizer is provided at the bottom of the foundation. In this case, as shown in FIG. 4, after leveling the ground, the formwork positioning frame 8 is fixed in the ground, and the concrete formwork A is attached to the formwork positioning frame.
Then, the correct direction and level are set, and the stabilizer reinforcing bar 9 and the mold 10 are arranged around the mold positioning frame 8.

[Third step] (Installation of rebar / anchor) After the installation of the form A is completed as described above, as shown in Figs. 4 and 5, the reinforcing bar for foundation reinforcement is placed in the form A. 11 and an anchor bolt 12 for fixing the building are arranged. Since the concrete form A has a low deformation rate after forming, the covering thickness can be easily secured by abutting the reinforcing bar 11 on the rib 5 protruding on the inner surface of the form, and the anchor Anchor 12 via support member 13
The anchor installation position can be easily and accurately determined by setting the distance from the inner surface of the upper end of the mold and fixing it at a required position. The suspension ring 4 can also be used for positioning the anchor support member.

[Fourth Step] (Concrete Filling / Curing) After the installation of the reinforcing bars 11 and the anchor bolts 12 in the form A is completed as described above, next, the concrete is placed in the form A. , Fill. When placing the stabilizer 4 on the lower part of the foundation, first mix ready-mixed concrete with form A
It is thrown into the mold 10 around and the surface is leveled. Then, concrete is thrown into the mold A to flow down and fill the space for forming the stabilizer from the bottom of the mold A. Fill the mold A with ready-mixed concrete. In this case, the pressure of flowing concrete is applied to the inner wall surface of the form,
Since the formwork has the ribs 5 to eliminate the weak points of the concrete wall and has sufficient pressure resistance, there is no problem in strength even if the wall part of the formwork is made relatively thin. . Therefore, it is possible to make the wall of the mold thin to reduce the total weight of the mold and reduce the transport load.

When the concrete put into the mold A is solidified, the anchor support member 13 is removed, and the desired foundation B is completed as shown in FIG. When the stabilizer 14 is molded at the same time, the stabilizer forming frame 10 is removed after curing and solidification if necessary, then the periphery of the foundation is backfilled and the stabilizer 14 is covered with earth and sand. If it is not necessary to remove the stabilizer forming frame or there is not enough time to do so, at the time when the injection of ready-mixed concrete into the form A is completed, the foundation construction is basically completed.

FIG. 6 is a perspective view showing a completed state of the foundation B on which the stabilizer 14 is simultaneously formed. The form A is integrally joined to the outer periphery of the foundation, and the anchor bolt 12 projects from the upper surface of the foundation. Therefore, the building C can be fixed on this foundation by using anchor bolts and nuts as illustrated in FIG. 7.

The suspension ring 4 can also be used for passing a wire or the like that keeps the building upright even after the foundation is completed and until the fastening of the building with the bolts and nuts is completed.

The above is an example of an independent foundation, but it is also possible to have a structure in which an underground beam can be easily connected to the installed foundation. That is, as shown in FIG. 8, a concave portion 15 is provided at an intermediate portion or a corner portion of one or a plurality of wall surfaces of the concrete formwork A ', and after the foundation is installed, the concrete formwork A'is also provided. The end portion of the plate-shaped or U-shaped underground beam forming mold 16 formed in 1 is fitted and fixed in the recess 15, the reinforcing bar 17 is assembled in the mold, and ready-mixed concrete is added to cure and solidify. Thereby, as shown in FIG. 9, the underground beam C can be easily formed and joined to the foundation B. It is preferable to embed a reinforcing iron rod 18 or the like in the joint portion. If the geography of the construction site allows, the molded girder can be moved elsewhere to fit and connect the ends of the girder to the recess 15 in the adjacent foundation.

If it is necessary to construct a tall foundation column by projecting the suspension ring 4 of the form A upward along the inner wall surface in the vicinity of the corner of the form A, the main parts are shown in FIG. As shown
When a plurality of molds A ₁ and A ₂ are stacked, the suspension ring 4 prevents relative movement of the upper and lower molds, and ready-mixed concrete can be poured into the molds in a stable state.
There is the advantage that no other holding means is required.

As described above, according to the present invention, the mold is made of reinforced concrete in the shape of a rectangular tube or a cylinder, and ready-mixed concrete can be poured into the mold so that the foundation can be placed. Providing reinforcing ribs that project inward from the wall surface, the ribs also function as spacers that set the overburden thickness of the reinforcing bars that are placed in the concrete foundation when in use. It is not necessary to assemble the frame, immediately pouring ready-mixed concrete into the transferred and installed formwork, and after solidifying, the formwork is integrally joined to the foundation and becomes part of the foundation,
Since it is not necessary to remove the formwork after the curing and hardening of concrete, on-site work is remarkably simplified, the construction period is significantly shortened, and the freight rate and the labor cost are remarkably reduced.

It is also effective and appropriate for the construction of foundations such as disaster prevention facilities, which are urgently required to be constructed, and for the construction of structures such as mountainous areas where construction is seasonally restricted.

[Brief description of drawings]

The drawings illustrate an embodiment of this invention,
The figure is a perspective view showing an example of a process for manufacturing a reinforced concrete formwork, and Fig. 2 is a longitudinal sectional view of a part of the concrete formwork,
Fig. 3 is a perspective view showing a state where the completed concrete formwork is moved, Fig. 4 is a perspective view showing a state in which the concrete formwork is installed on the site, and Fig. 5 is a concrete formwork that is used in the foundation. FIG. 6 is a perspective view showing a state where the reinforcing bars and anchors to be embedded are attached, FIG. 6 is a perspective view of the completed foundation, and FIG.
The figure is a perspective view of the essential parts showing an example in which a building is attached to the foundation.
The figure is a perspective view showing an example improved to connect with an underground beam, Fig. 9 is a vertical sectional view of a joint, and Fig. 10 is a partial front view showing an example in which a plurality of molds are vertically connected. FIG. 1, 2 ... Formwork, 3 ... Reinforcing bar, 4 ... Suspension ring, A ... Reinforced concrete formwork, 5 ... Rib, 11 ... Reinforcing bar, 12 ... Anchor bolt, 13 ... Anchor support member, 14 ... Stabilizer plate, B ... Foundation , 15 ... Recessed portion, 16 ... Underground beam forming form, 17 ... Reinforcing bar, C ... Underground beam.

Claims (4)

[Scope of utility model registration request] 1. (a) It is formed of reinforced concrete in the shape of a rectangular tube or a cylinder and is used for constructing a foundation by pouring ready-mixed concrete into it. (B) Reinforcement protruding inward from the inner wall surface. (C) The rib also serves as a spacer for setting the covering thickness of the reinforcing bar arranged in the concrete foundation during use, and the concrete formwork for constructing a concrete foundation. 2. A utility model registration claim according to claim 1, characterized in that it has a recess on the outer side and a recess for fitting the end of the underground beam forming mold or the end of the underground beam. Concrete formwork for concrete foundation construction described in. 3. A utility model registration claim according to claim 1, wherein a part of the reinforcing bar forms a suspension ring, and is projected upward at a plurality of positions which are even with respect to the center of gravity of the upper end. Alternatively, the concrete formwork for constructing a concrete foundation according to item 2. 4. The concrete foundation according to claim 3, wherein the suspension ring is provided on the extension of the inner wall surface and serves as a positioning tool and a slip prevention tool for the vertically stacked molds. Concrete formwork for construction.