JP2891931B2 - Formwork for building concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork for constructing a concrete structure, and more particularly to a formwork for forming a wall surface without removing it after hardening concrete.

[0002]

BACKGROUND OF THE INVENTION Conventionally, when constructing a concrete structure such as a retaining wall or a bridge pier, a scaffold is assembled around the entire structure to be constructed, reinforcing bars are arranged inside, and then a formwork is assembled and a binding material is installed. Then, the formwork was connected to each other, and the inside of the formwork was filled with concrete. Then, after the concrete was hardened, the formwork was dismantled and cleaned, and the same work was repeated to build a structure.

[0003] However, according to such conventional work,
A large number of molds, fasteners, butter materials, etc. are required, and complicated assembly and disassembly work is required. In addition, cleaning work is required each time the form is dismantled. In addition, this mold requires not only skill for installation and disassembly, but also complicates the operation, leading to a longer construction period.

Therefore, in order to solve the above problems,
There is a method of forming a concrete filling space by forming a formwork with a precast concrete plate (hereinafter, referred to as a PC plate) manufactured in advance in a factory, and pouring concrete into this space. Kaisho 60-
No. 80138. According to this method, since the wall of the structure is formed without removing the formwork, the work of removing the formwork can be omitted.

[0005] However, even with such a known mold, a complicated operation of tightening with a bolt and a nut for mounting the PC board is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a formwork for constructing a concrete structure which simplifies the work of attaching a molded plate such as a PC plate.

[0007]

In order to achieve the above object, the invention according to claim 1 is directed to a forming plate which is erected to define a space for filling concrete, and a column for supporting the forming plate on the back side. And the forming plate has an angle material protruding from the back surface in an L shape and extending from near the upper end to near the lower end, and the angle material is provided on at least a part of the support. It is characterized in that the forming plate is fixed to the column by hooking and driving a wedge so as to widen the interval between the forming plate and the column.

According to the present invention, the support is arranged between the back surface of the formed plate (the surface of the concrete structure on which the concrete is cast) and the angle member, and the formed plate is formed simply by driving in a wedge. Can be fixed to a support. This operation is much simpler than the conventional operation using bolts and nuts.

[0009] Further, since the angle material is long from the vicinity of the upper end to the vicinity of the lower end of the formed plate, the area in contact with the column is widened, and the load from the poured concrete can be dispersed. Therefore, the angle members and the columns can be configured to be relatively small. Alternatively, since the load bearing capacity is increased, the height of the concrete poured at one time can be increased.

According to a second aspect of the present invention, in the mold according to the first aspect, a guide groove for driving the wedge is formed on a back surface of the forming plate. This facilitates the wedge driving operation and prevents the wedge from falling off.

According to a third aspect of the present invention, in the mold according to the first or second aspect, the angle member is provided by welding to a plate built in the forming plate.

According to the present invention, since the formed plate incorporates the plate, not only the bending strength is increased, but also the welding area with the angle material is increased, and the pull-out strength is increased. Therefore, the strength to withstand the lateral pressure at the time of concrete casting is increased, and the casting height of concrete that can be cast at one time can be increased.

According to a fourth aspect of the present invention, there is provided the mold according to any one of the first to third aspects, wherein the angle member is configured to have a protruding length from the back surface of the molded plate. It is characterized in that it is designed according to the required fogging amount of the object.

According to the present invention, the projecting length of the angle material is designed according to the required fogging amount, and the fogging amount can be easily adjusted only by changing the size of the angle material. it can.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view showing a formwork for constructing a concrete structure according to the embodiment. This formwork
This is for constructing a retaining wall.
Is attached.

The support 10 includes a column 12 formed by erecting an angle iron, and a connecting plate 14 for connecting and supporting the opposing columns 12. It should be noted that, in addition to the angle iron, an H-shaped steel, an I-shaped steel, a channel steel, or the like is used to support the column 1
It may be 2.

Here, the support 12 is, as shown in FIG.
It is preferable to be fixed to the floor slab 100 provided on the ground with concrete. And in this embodiment, the support | pillar 1
2 is performing the function of the main rebar, and the arrangement of the rebar is omitted.

FIG. 2 is an overall perspective view of the PC board 20, and FIG. 3 is a view showing the internal structure of the PC board 20.

The PC board 20 has a rectangular shape, and has ridges 20a and 20b which form hiccups on the upper and lower end surfaces.
As shown in FIG. 1, when stacked, no gap is communicated with the joint. Similarly, a ridge 20c and a dent 20d are also formed on the left and right end surfaces.

The PC board 20 is used for manual construction.
It is limited to a weight of about 20 kg / sheet. For example, a size of 600 mm × 300 mm × 30 mm is 12.4 k.
g / sheet 14.5k with dimensions of 600mm x 300mm x 35mm
g / sheet 20.7k with dimensions of 600mm x 300mm x 50mm
g / sheet is preferable.

The PC board 20 is provided with an angle member 22 projecting from the back surface in an L-shape. The angle member 22 is formed to be relatively long from near the upper end to near the lower end of the PC board 20. Further, as shown in FIG. 3, the angle member 22 is fixed by welding to a plate 26 built in the PC board 20. For more information,
As shown in FIG. 4, two plates 26 are provided in a row at the top and bottom, and the angle member 22 is provided so as to bridge over these two plates 26.

As described above, since the angle member 22 is welded to the plate 26, the pull-out strength increases.
In particular, if the width of the plate 26 is increased or a plurality of plates 26 are provided to increase the welding area with the angle member 22, the pull-out strength further increases. Further, by incorporating the plate 26, the bending strength of the PC board 20 is also increased.

The angle member 22 is, more specifically, a PC board 20.
And a parallel piece 22b which is bent at a right angle from the rising piece 22a and positioned parallel to the back face of the PC board 20. Also,
As shown in FIG. 2, the two angle members 22 are provided such that the parallel pieces 22b are bent in the same direction.

The upper end of the rear surface of the PC board 20 is adjacent to the rising piece 22a of the angle material 22,
A guide groove 24 is formed on the side where b is formed.
More specifically, the guide groove 24 is formed so that the groove gradually becomes shallower from the upper end to the lower end of the PC board 20.

The guide groove 24 is used for fixing the PC board 20 to the column 12, and will be described with reference to FIG. FIG. 5 is a diagram illustrating a fixed state of the PC board 20 and the support 12.

In FIG. 2, the parallel plate 22b of the angle member 22 is arranged so as to be
0 is attached. And the guide groove 24 and the support 12
The PC board 20 is fixed by driving the wedge 16 between them. Here, since the guide groove 24 is formed,
The positioning of the wedge 16 is facilitated, and the wedge 16 is prevented from coming off.

When the wedge 16 is driven in, the angle material 22
Since the force is applied in the direction in which the angle member 22 is pulled out, it is effective that the angle member 22 is firmly fixed to the plate 26 as described above. Further, since the angle member 22 is formed to be relatively long, the area in contact with the column 12 is widened, and the load from the cast concrete can be dispersed. Therefore, the height of the concrete poured at one time can be increased.

Further, as shown in FIG.
The length 1 of the second rising piece 22a is designed so as to correspond to the required cover amount of the cast concrete, and the cover amount can be adjusted only by changing the length l.

The present embodiment is configured as described above, and a method of installing the PC board 20 will be described below.

First, the ground on which a concrete structure is to be constructed is excavated, crushed stones are spread, and compacted. Then, leveling concrete is cast, a reinforcing bar for a floor slab is placed thereon, and fresh concrete is cast to form a floor slab 100 shown in FIG. Next, the supporter 10 shown in FIG. 1 is assembled on the floor slab 100.

Alternatively, the support 10 may be assembled before the floor slab 100 is formed. That is, it is also possible to cast the leveling concrete to erect the support 10, install the reinforcing bar and the formwork for the floor slab 100, and then cast the ready-mixed concrete for the floor slab 100.

Before performing these operations, scaffolds and reinforcing bars are assembled if necessary. And the floor slab 100
When the formation of the support and the assembling of the shoring 10 are completed,
0 are attached in order from the first step. These operations can all be performed in the space where concrete is to be poured.

Then, the first-stage PC board 2 is placed on the floor slab 100.
0 is fixed to the support 12. Specifically, FIG.
As shown in FIG. 6A, the angle member 22 is arranged at a position avoiding the column 12, and the PC board 20 is slid in a direction in which the angle member 22 is hooked on the column 12 (FIG. 6).
(B)). Then, as shown in FIG.
0 while guiding the wedge 16 in the guide groove 24
This is driven between the plate 20 and the support 12 to fix them.

Next, the second-stage PC board 20 is formed on the ridge 20a (see FIG. 2) formed on the upper end surface of the first-stage PC board 20.
Protrusions 20b formed on the lower end surface of plate 20 (see FIG. 2)
Are alternately fitted, and the second-stage PC board 20 is installed and fixed in the same manner as described above. In addition, PC
As shown in FIG. 1, the plates 20 are preferably stacked in a staggered manner to increase the strength.

As described above, the PC boards 20 are sequentially attached, and one lift (preferably about 1.8 m to 3.0 m) is piled up, and concrete is poured into the concrete placing area formed by this. Cast and cure. Here, concrete is poured one lift at a time,
The work period is shortened as compared with the case where each PC board 20 of the step is cast.

In this manner, the formwork is constructed by one lift and the concrete is poured. When all the PC boards 20 have been mounted and the concrete has been placed, the retaining wall is completed without removing the formwork. That is, the PC board 20 forming the concrete casting area is left without being removed, and forms the wall surface of the retaining wall. By doing so, the dismantling work of the mold can be omitted. In addition, the PC board 20 on the front side of the retaining wall
By applying a color to the material, a beautiful appearance can be obtained.

Moreover, according to the present embodiment, the support 10
Is provided only inside the PC board 20, so that the outer support can be omitted. Further, if only the support 12 is used as the main reinforcing bar, the troublesome work of arranging the main reinforcing bar can be omitted.

Moreover, since the supporter 10 is left buried in the concrete, the dismantling operation can be omitted.

In the above embodiment, the present invention is applied to a retaining wall. However, the present invention is not limited to this.
It can also be applied to large concrete structures such as piers. In that case, it is preferable to appropriately change the dimensions of the members such as the PC board and the support so that the steel material ratio becomes a standard value.

[0041]

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a formwork for constructing a concrete structure according to an embodiment.

FIG. 2 is a perspective view showing a PC board used in FIG.

FIG. 3 is a diagram showing an internal structure of the PC board of FIG. 2;

FIG. 4 is a perspective view showing an internal structure of a PC board.

FIG. 5 is a diagram showing an attached state of a PC board and a support.

FIG. 6 is a diagram showing a method of attaching a PC board and a support.

FIG. 7 is a schematic side view showing a formwork for constructing a concrete structure according to the embodiment.

[Explanation of symbols]

 12 Support 16 Wedge 20 PC board (Forming board) 22 Angle material (Hook) 24 Guide groove 26 Plate

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kyohei Aoki 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (56) References Open-ended 48-54807 (JP, U) Open-ended 60 -80138 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 29/02 309 E04B 1/16 E04B 2/86

Claims (4)

(57) [Claims] 1. A molded plate that stands upright so as to define a space for filling concrete, and a column that supports the molded plate on a back side thereof, wherein the molded plate protrudes from the back surface in an L-shape and has an upper end. Having an angle member extending from the vicinity of the portion to the vicinity of the lower end portion, hooking the angle member on at least a part of the support, and driving a wedge so as to widen a gap between the forming plate and the support. A mold for fixing a concrete structure, wherein the forming plate is fixed to the support. 2. The formwork according to claim 1, wherein a guide groove for driving the wedge is formed on a back surface of the forming plate. 3. The formwork according to claim 1, wherein the angle member is provided by welding to a plate built in the forming plate. . 4. The mold according to claim 1, wherein the angled material is configured such that a projecting length from a back surface of the molded plate is set to a required fogging amount of a structure to be constructed. A formwork for constructing a concrete structure, characterized in that it is designed accordingly.