JPH1025891A - Concrete form device and column constructing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time greatly for the installing and decomposing operations of concrete form segments in the case where a number of ferro-concrete columns are constructed, and thereby shorten the construction period and suppress the costs. SOLUTION: A concrete form device concerned 2 is to construct ferro-concrete columns 4 and is composed of a concrete form 14 devided in four form segments 12, retainers 16 for them 12, and scaffold 18, hoops 20, etc. To construct each column 4, the device 2 is lifted by a winch, etc., and hung down so that reinforcing bars 410 arelocated inside. Then the form segments 12 are moved by the retainers 16 inward in the radial direction, and the ends of the form segments 12 are butted together, and in its inside, concrete is placed. After the concrete has hardened, the inside surfaces of the form segments 12 are separated from the outside surface 402 of the column 4, and the device 2 is hung up while the hoops 20 are left rolling upon the column 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork apparatus suitable for forming a column made of reinforced concrete and a method of constructing a column using the same.

[0002]

2. Description of the Related Art Reinforced concrete cylindrical columns are widely used for various structures. Conventionally, when a cylindrical pillar made of reinforced concrete is produced, first, a reinforcing bar for the pillar is arranged on the ground, and this is erected. Next, a concrete formwork is formed by assembling a plurality of formwork divisions using a moving scaffold or a stepladder outside the standing reinforcing bar. Next, concrete is poured into the inside of the concrete formwork. Finally, after the concrete has hardened,
Using a moving scaffold or stepladder, disassemble the plurality of formwork divisions and remove the concrete formwork.

[0003]

On the other hand, when a large number of such reinforced concrete columns are manufactured, the work of assembling and disassembling the divided form bodies using moving scaffolds and stepladders is troublesome and troublesome. If you repeat a series of operations many times, the work efficiency will be poor, so the construction period will be long,
Also, the construction cost increases. The present invention has been devised in view of the above circumstances, and an object of the present invention is to assemble a mold divided body, can significantly reduce the working time required for disassembly,
Accordingly, it is an object of the present invention to provide a concrete formwork apparatus capable of shortening a construction period and reducing costs and a method of constructing a pillar using the same.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a concrete formwork apparatus for erection of a column made of reinforced concrete, which has an inner surface corresponding to the outer peripheral surface of the column. The concrete mold comprises a cylindrical concrete form having a peripheral surface, and the concrete form is divided in a circumferential direction of the column, and includes a plurality of form divisions that form the inner peripheral surface in a combined state, On the outer periphery of the frame, holding means for supporting the plurality of form divisions so as to be movable in the radial direction, and holding the plurality of form divisions in a combined state, in a vertical direction of the concrete form. At a lower end of each of the divided molds, a plurality of the divided molds are formed at the lower end of each divided mold in a state where the plurality of divided molds are moved outward in the radial direction. Circle of Wherein the Watai is mounted to roll on the outer peripheral surface shaped for pillars. Also,
In the present invention, a scaffold is provided above the plurality of divided molds with a gap between the divided form and an outer peripheral portion of the divided form, and a handrail is erected from the outer peripheral portion of the scaffold. . Further, the present invention is characterized in that the ring body is detachably provided on each of the mold divided bodies. Further, the present invention provides a method of erecting a cylindrical pillar made of reinforced concrete, combining a plurality of formwork divisions divided in a circumferential direction of the cylindrical pillar, and forming a reinforcing rod constituting the cylindrical pillar. Around the periphery, an inner peripheral surface corresponding to the outer peripheral surface of the columnar column is formed, and a plurality of formwork divisions are held together by holding means, and concrete is placed inside the plurality of formwork divisions. After the concrete was hardened, the holding of the holding means was released, and a ring was attached to the lower end of each of the divided mold bodies so as to roll on the outer peripheral surface of the cylindrical column made of reinforced concrete. Is lifted from above and from the outside in the radial direction of each of the columnar columns.

When a reinforced concrete column is made using the formwork apparatus of the present invention, first, a reinforcing bar is erected at a position where the column is to be formed. Next, the concrete form device is hoisted by a hoist, and hung so that the rebar is located inside the concrete form device. Next, each mold division is moved inward in the radial direction, the ends of each mold division are aligned, and the concrete mold is fixed. Next, concrete is poured into the concrete formwork. When the concrete hardens, a columnar column is created, and when the concrete hardens, each mold split is moved outward in the radial direction, and the inner peripheral surface of each mold split is moved from the outer peripheral surface of the column. Let go. Next, the ring body is attached to the lower end of each mold divided body so as to roll on the outer peripheral surface of the column. next,
The concrete form device is lifted by the hoist, and the concrete form device is pulled upward from the pillar. When the concrete formwork apparatus is pulled out upward, the concrete formwork apparatus is moved to the next column construction site, and a series of operations similar to the above are performed, and columns are successively formed. In this case, concrete is poured into the inside of the plurality of form divisions, and after the concrete is hardened, each of the plurality of form divisions is lifted upward and from the radial outside of the columnar column. This is advantageous in separating the mold divided body from the cylindrical pillar.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory view of placing concrete using a concrete formwork device, FIG. 2 is an explanatory view of lifting a concrete formwork device after hardening concrete, and FIG. 3 is a concrete formwork device being lifted after concrete hardening. FIG. 4 is a plan view of the concrete formwork apparatus, FIG. 5A is a plan view of a main part of the holding means, and FIG. As shown in FIG. 3, the concrete formwork apparatus 2 of the present invention is for erection of a reinforced concrete cylindrical column 4 almost vertically,
It is hung by a hoist via wires 6, hooks 8 and the like, and is also hung and repeatedly used, whereby a number of pillars 4 are formed. Concrete formwork device 2
As shown in FIG. 4, a concrete formwork 14 composed of four formwork divisions 12, holding means 16 for the four formwork divisions 12, a scaffold 18 provided on the upper part of the concrete formwork 14, It is composed of a ring body 20 (see FIG. 2) provided at the lower end of the concrete formwork 14.

As shown in FIGS. 1 and 4, each of the divided mold bodies 12 has an arc-shaped plate body 1202 and each plate body 1.
Reinforcement plate 120 attached along the edge of the outer peripheral surface of 202
4. Reinforcement plates (not shown) attached vertically on the outer peripheral surface of each plate body 1202 and the like. Each formwork divided body 12
As shown in FIG. 4, in the assembled state, a mold surface corresponding to the outer peripheral surface 402 of the column 4 is formed by the inner peripheral surface 1210 thereof.

[0008] As shown in FIG.
The concrete form 14 is provided at a plurality of locations on the outer periphery of the concrete form 14 which are vertically spaced. The holding means 16
In the embodiment, two flat steel plates 22 bent in an arc shape are used.
And a guide 24 (see FIG. 1) through which the flat steel 22 erected on the outer peripheral portion of each of the divided mold bodies 12 is inserted, and a block 2 provided at an end of each flat steel 22 and having a bolt insertion hole.
6, a male screw member 28 inserted into the bolt insertion hole of the block 26 of the two flat steel plates 22, and a nut 30 screwed to the male screw of the male screw member 28 outside the block 26. Then, by tightening the nut 30, the annular ring made of the two flat steel plates 22 is reduced in diameter, whereby the respective mold divided bodies 12 are moved inward in the radial direction and joined together. By loosening, the annular ring made of the two flat steel plates 22 is expanded in diameter, so that each of the mold segments 12 is moved radially outward.

As shown in FIGS. 1 and 4, the scaffold 18 is an annular plate disposed radially outward of the concrete form 14 with a clearance provided between the scaffold 18 and the outer peripheral surface of the concrete form 14. 1802, a support member 32 disposed on the outer peripheral surface of each of the divided mold bodies 12, on which the plate 1802 is placed, and a handrail 34. The support member 32 is a vertical member 3202 that extends vertically along the outer peripheral surface of the mold segment 12.
And grooves 3204 formed above and below the vertical member 3202
The flat plate steel 22 is inserted into the support member 32 by being fastened to the outer peripheral surface of the divided mold body 12 by the flat plate steel 22.
Is fixed, so that the annular plate 1 is placed on the support member 32.
802 is placed. Support rods 3210 are provided on each support member 32 so as to stand vertically from the outer periphery of the plate 1802, and these support rods 3210 are vertically spaced from each other.
A steel bar 3212 is hung at a location, and the handrail 34 is composed of a support bar 3210 and a steel bar 3212. As shown in FIG. 4, when viewed in plan, the handrail 34 is provided with an opening 3402 that opens to one side of the plate.
Note that the annular plate 1802 is provided with an opening (not shown) which is opened and closed by a lid (not shown) so that the ascending and descending to the scaffold 18 can be easily performed. ,
The holding means 16 is used as a scaffold.

As shown in FIG. 2, the ring body 20 is detachably attached to the lower end of each of the mold sections 12. The ring body 20 is rotatably supported by the holder 36, and the nut 30 is loosened so that the diameter of each of the mold divided parts 12 is increased, on the outer peripheral surface 402 of the column 4 formed inside the concrete form 14. The holder 36 is attached to the lower end of each of the formwork divisions 12 by screws or the like so that the roller is rolled.

Next, a case where the reinforced concrete column 4 is made by using the concrete formwork device 2 will be described.
First, the reinforcing bars 410 (see FIG. 3) are arranged, and are erected at positions where the columns 4 are to be formed. Next, the wire 6 and the hook 8 are
The concrete form device 2 is lifted via the above-described method, and is hung so that the reinforcing bar 410 is positioned inside the concrete form device 2. In this case, the nut 30 is loosened to move each of the mold divided bodies 12 outward in the radial direction.

Next, the nuts 30 are tightened to move the respective mold divisions 12 inward in the radial direction, the ends of the respective mold divisions 12 are aligned, and the concrete mold 14 is fixed. Next, as shown in FIG. 1, a worker gets on the scaffold 18 and casts concrete into the concrete formwork 14. In this case, for example, a flexible hose to which concrete is pumped from a concrete mixer truck is connected to the scaffold 1.
8 from the open portion 3402 to the inside of the concrete formwork 14.

When concrete is poured into the concrete form 14 and the concrete hardens, a columnar column 4 is formed.
0 is loosened, and each mold segment 12 is moved outward in the radial direction, and the inner peripheral surface of each mold segment 12 is separated from the outer peripheral surface 402 of the column 4. Next, the concrete formwork device 2 is slightly lifted by the hoisting machine via the wires 6 and the hooks 8 and the like, and the holder 36 is screwed or the like so as to roll on the outer peripheral surface 402 of the column 4 so that each of the formwork divided bodies is formed. 12 attached to the lower end.

Next, as shown in FIGS. 2 and 3, the concrete form device 2 is further lifted, and the concrete form device 2 is pulled out from the column 4 upward. In this case, as shown in FIG. 3, each mold divided body 12 is lifted from above and from the outside in the radial direction of the columnar column 4, whereby
Each mold division 12 is separated from the column 4 and is smoothly lifted. Furthermore, since the wheel body 20 rolls on the outer peripheral surface 402 of the column 4, each of the enlarged formwork divided bodies 12 does not contact the column 4, and the center of each formwork divided body 12 and the column 4 is moved. The concrete form device 2 is smoothly pulled out in a substantially coincident state. When the concrete formwork device 2 is pulled out upward, the concrete formwork device 2 is moved to the next column construction site, and the concrete formwork device 2 is suspended so that the reinforcing bars laid and erected are located inside thereof. A series of operations similar to those described above are performed, and the pillars 4 are formed one after another. The ring body 20 may be removed before covering the next reinforcing bar 410, or may be removed after covering the next reinforcing bar 410.

As described above, when the concrete formwork apparatus 2 according to the embodiment is used, a plurality of formwork divisions are assembled each time outside the reinforcing bar using a moving scaffold or a stepladder as in the related art. The work of disassembling and removing each time after curing can be greatly simplified. Therefore, according to the concrete form device 2 according to the embodiment, when a large number of columns made of reinforced concrete are made, the work time required for assembling and removing the concrete form can be significantly reduced, and the construction period and cost can be reduced. Becomes possible. Furthermore, after the column 4 is formed inside the concrete form 14, when the concrete form apparatus 2 is lifted, each form division 12 is moved upward and each radius of the column 4 is raised. By being lifted from the outside in the direction, each of the divided mold bodies 12 is separated from the columnar pillars 4, which is more advantageous in lifting smoothly.

Although the embodiment has been described with respect to the case where the wheel body 20 is detachably provided, the wheel body 20 is attached to
2 may be mounted to be displaceable radially outward and inward. When the concrete form 14 is hung over the reinforcing bar 410, if a ring similar to the ring 20 is provided on the head 410 of the reinforcing bar, damage to the inner surface of each of the divided frames 12 is prevented. The above is advantageous.

[0017]

As is clear from the above description, according to the concrete formwork apparatus of the present invention, a plurality of formwork divisions are suspended by a lifting machine in a state where the diameter of the plurality of formwork divisions is increased, and the plurality of formwork divisions are covered with a reinforcing bar. Concrete is cast in a state where the frame division is reduced in diameter, and after the concrete is hardened, multiple formwork divisions are expanded and the wheel is rolled up, lifted by a lifting machine, and moved to the next construction site. Repeat the same work at the next construction location,
In this way, a number of concrete pillars are erected. Therefore, the work time required for assembling and disassembling the mold divided body using the conventional moving scaffold or stepladder can be greatly reduced, thereby shortening the construction period and reducing the cost. Furthermore, after the concrete is hardened, if each of the plurality of formwork divided bodies is lifted from above and from the radial outside of the columnar column, respectively,
This is advantageous in separating the mold segment from the cylindrical pillar.

[Brief description of the drawings]

FIG. 1 is an explanatory view when casting concrete using a concrete formwork apparatus.

FIG. 2 is an explanatory view when a concrete form device is lifted after concrete is hardened.

FIG. 3 is an explanatory view when a concrete form device is lifted after concrete is hardened.

FIG. 4 is a plan view of the concrete formwork apparatus.

5A is a plan view of a main part of the holding means, and FIG. 5B is a front view of the same.

[Explanation of symbols]

 2 Concrete formwork apparatus 4 Pillar 12 Formwork divided body 16 Holding means 18 Scaffolding 20 Ring body 22 Plate steel 26 Block 28 Male screw member 30 Nut

Claims (4)

[Claims] 1. A concrete formwork apparatus for erection of a column made of reinforced concrete, comprising: a cylindrical concrete formwork having an inner peripheral surface corresponding to an outer peripheral surface of the column; The formwork is divided in the circumferential direction of the column, and is made up of a plurality of formwork divisions that form the inner peripheral surface in a combined state, and the outer periphery of the concrete formwork includes the plurality of formwork divisions. A plurality of holding means for movably supporting in the radial direction and for holding the plurality of formwork pieces in a combined state are provided at intervals in the vertical direction of the concrete formwork. In such a state that the plurality of divided mold bodies are moved outward in the radial direction, so that they roll on the outer peripheral surface of a reinforced concrete cylindrical column formed inside the concrete formwork. Attached to the wheel Is, concrete forms and wherein the. 2. A scaffolding plate is provided above the plurality of formwork divisions with a gap between the formwork divisions and an outer periphery of the formwork divisions, and a handrail stands upright from the periphery of the scaffolds. Claim 1
The described concrete formwork device. 3. The concrete formwork apparatus according to claim 1, wherein the ring body is detachably provided on each of the divided mold bodies. 4. When a cylindrical pillar made of reinforced concrete is erected, a plurality of divided form bodies divided in a circumferential direction of the cylindrical pillar are combined to form a periphery of a reinforcing bar constituting the cylindrical pillar. Forming an inner peripheral surface corresponding to the outer peripheral surface of the columnar column, holding the plurality of mold divided bodies together by a holding means, and placing concrete inside the plurality of mold divided bodies. After the concrete has hardened, the holding of the holding means is released, and a ring body is attached to the lower end of each of the formwork divided bodies so as to roll on the outer peripheral surface of the cylindrical column made of reinforced concrete. A method for constructing a reinforced concrete column, wherein the formwork divisions are lifted from above and radially outward of the column.