JP2003039419A - Form for cylindrical concrete product and method for manufacturing cylindrical concrete product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a cylindrical concrete product to be efficiently manufactured by placing a form of the product in a line by allowing an outer mold (particularly a side board) from the form before an inner mold is released. SOLUTION: A method for manufacturing the cylindrical concrete product comprises the steps of vertically dividing the side board of the form from its intermediate part, rotatably attaching an upper side board to a lower side board via a hinge, and inclining the side boards to an outside, thereby allowing the boards to be opened. Since the side boards are vertically divided, the inner mold is throttled, then the upper side board and the side plate are opened, and then the lower side board is opened. Thus, before the inner mold is drawn out, the cylindrical concrete product can be removed from the outer mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a tubular concrete product such as a box culvert or an underdrain, and more particularly to a mold for molding a tubular concrete product in a state in which the through holes are horizontal.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view in the width direction of a form 20 of a conventional tubular concrete product (box culvert), FIG. 9 is a sectional view in the lengthwise direction, and FIG. 10 is a sectional view in the widthwise direction at the time of demolding. 11 is a sectional view in the lengthwise direction when the mold is removed.

The mold 20 is composed of an outer mold and an inner mold 24, and the outer mold is formed in a box shape by a bottom plate 23, two end plates 21 and two side plates 22 which are arranged opposite to each other. The inner mold 24 has a tubular shape, and both ends are fitted and held in openings provided in the end plate 21 and set in the outer mold. Further, the inner mold 24 is provided with a diaphragm mechanism 25 that reduces the diameter when the mold is released.

Concrete is poured into the cavity 27 of the form 20, and after hardening, the product is demolded. At the time of demolding, first, as shown in FIG. 10, the diaphragm mechanism 25 is operated to reduce the diameter of the inner mold 24, and the inner mold is pulled out from the outer mold (product). After that, the outer gable plate 21 and the side plate 22
Open and remove the product from the outer mold. In FIGS. 10 and 11, the end plate 21 and the side plate 22 are hinged to the bottom plate 23 by hinges 26, but there are other types such as a hinged type and a pull-out type.

[0005]

Conventionally, since the inner mold must first be removed from the product when the mold is removed,
It was not possible to efficiently manufacture a tubular concrete product by placing the formwork on the line. This is because there is no space for removing the inner mold because the molds are carried along the length of the line.

An object of the present invention is to enable the outer mold (particularly the end plate) to be removed from the inner mold before it is removed from the mold, so that the form of the tubular concrete product can be put on the line and efficiently manufactured. It was made as.

[0007]

According to the present invention, a bottom plate, an outer die formed in a box shape with two end plates and two side plates opposed to each other, and a tubular end with the end plates provided on the end plate. In a form of a tubular concrete product having an inner mold fitted and held in an opening, the gable plate is vertically divided from a dividing part, and the upper gable plate is hinged to the lower gable plate and inclined outward. It is a form of tubular concrete product that can be opened by opening. Since the end plate is divided into upper and lower parts, after squeezing the inner mold, first open the upper end plate and side plates, and then open the lower end plate so that the tubular concrete product can be taken out from the outer mold before removing the inner mold. it can. Further, depending on the position where the end plate is divided, the concrete product can be easily taken out by lifting the concrete product from the outer mold in a state where the inner mold is squeezed and the upper end plate and the side plate are opened.

According to the present invention, a step of filling concrete into the above-mentioned mold of the present invention and hardening it, a step of removing the outer mold and taking out a tubular concrete product containing an inner mold from the outer mold, And a step of removing the inner mold from the tubular concrete product by taking it out. Since the tubular concrete product containing the inner mold and the outer mold is removed from the outer mold, the mold can be placed on the line to be manufactured. That is, the product can be taken out of the outer mold while the inner mold is inside the product, and the inner mold can be taken out of the product outside the line. The extracted inner mold may be returned to the line again to assemble the mold.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the drawings showing the embodiments. 1 is a side view of the mold 1 of the embodiment, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIGS. 3 and 4 are illustrations of a demolded state, FIG. 5 is an illustration of an oval tube, and FIG. 6 is a circle. FIG. 7 is an explanatory view of a pipe, and FIG. 7 is an explanatory view of a production line of the tubular concrete product 15.

A mold 1 for molding a box culvert comprises an outer mold and an inner mold 7. The outer mold is formed in a box shape by a bottom plate 6, two opposing end plates 2 and two side plates 4. Has been done. The inner die 7 has a tubular shape with a substantially quadrangular cross section, and both ends are fitted and held in the openings 3 provided in the end plate 2 and set in the outer die. In addition, the inner mold 7 is a drawing mechanism 8 that reduces the diameter when demolding.
Is equipped with.

A feature of the formwork 1 is that the end plate 2 is divided into upper and lower parts by a dividing part 2c, and the upper end plate 2a is hinged to the lower end plate 2b by a hinge 5. Therefore, as will be described later, it is possible to open the end plate and remove the product from the outer mold without removing the inner mold. The lower end plate 2b and the side plate 4 are hinged to the bottom plate 6 with hinges 9.

Concrete is poured into the cavity 18 of the mold 1, and after hardening, the product is demolded. In demolding, first, the inner mold 7 is squeezed, and then the upper end plate 2a is opened as shown in FIG. Next, as shown in FIG.
Open b. Since the upper end plate 2a is already open, the lower end plate 2b can be easily opened. Further, when the side plate 4 is opened, the concrete product can be taken out from the outer mold by removing it from the outer mold in a state where the concrete product is contained without removing the inner mold. Further, in the case of this embodiment, the concrete product can be lifted up and released from the outer mold without opening the upper end plate 2a and the side plate 4 and without opening the lower end plate 2b, and can be easily taken out. this is,
This is because the position of the dividing portion of the gable plate is set so that the inner mold can be pulled out from the lower gable plate when the concrete product is lifted.

When the through hole has a substantially quadrangular cross section like a box culvert, the dividing portion of the end plate can be located at any position on the horizontal plane passing through the vertical side of the through hole, but at the center or It is preferable to set the position on a horizontal plane slightly below the center. This is because it is advantageous that the split portion of the gable plate is located below when the concrete product is lifted and released from the outer mold without opening the lower gable plate.

In the case of an oval tube as shown in FIG. 5, the dividing portion of the gable plate is a horizontal plane passing through the through hole, and a position of the horizontal plane h1 at a position where the egg-shaped tangent line of the through hole is vertical, or this It is preferable to make it a horizontal plane below. By doing so, when the concrete product is lifted up without opening the lower end plate and is removed from the outer mold, the inner mold can be easily removed from the lower end plate and easily released from the mold.

In the case of the circular pipe as shown in FIG. 6, the split portion of the end plate is a horizontal plane passing through the through hole and located at a horizontal plane h2 including the center of the through hole or a horizontal plane below the horizontal plane h2. Is preferred. By doing this, as in the case of the oval tube, when lifting the concrete product without opening the lower end plate and releasing it from the outer mold, the inner mold can easily be removed from the lower end plate and easily released. Is. In this way, it is desirable to set the position of the split portion of the end plate so that the inner mold can be easily removed from the lower end plate when the concrete product is lifted up and released from the outer mold without opening the lower end plate.

Next, a box culvert manufacturing line on which the mold 1 is placed will be described with reference to FIG. In FIG. 7, reference numerals 10 and 11 are conveyors, 12 is a pusher,
13 is a pedestal on which the formwork 1 is placed, 14 is a curing room, and 15 is a product (box culvert). Formwork 1 with complete curing
Are carried on the conveyor 10 by a forklift, moved in the line direction, and further moved on the line in the downward direction by the pusher 12 in FIG. At the position A on the line, the product is demolded, at the position B, the form is cleaned and oiled, at the position C, the rebar is inserted and the form is assembled, and at the position D, concrete is poured and compacted. The formwork 1 that has moved onto the conveyor 11 moves in a direction away from the line by the conveyor 11, and further the curing room 1 by a forklift.
It is transported to No. 4 and cured.

At the position A, the product 15 is demolded from the outer mold, but the inner mold 7 is not demolded and is inside the product 15. The product 15 demolded from the outer mold moves to the sub line, and the inner mold 7 is demolded at the position E. Product 1 with the inner mold 7 removed
5 is carried to the stockyard, the inner mold 7 is moved to the position F, cleaned and oiled, and incorporated in the outer mold at the position C. As described above, by removing the product from the outer mold by taking it out from the outer mold without removing the inner mold, it is possible to put the formwork 1 on the line and efficiently manufacture a tubular concrete product.

[0018]

[Effects of the Invention] In the formwork of the tubular concrete product of the present invention, the outer form can be demolded before the inner form is demolded, so that the formwork can be put on a line and efficiently manufactured. Becomes That is, in the method for producing a tubular concrete according to the present invention, the product is taken out from the outer mold without extracting the inner mold on the line, and the inner mold is extracted outside the line to produce a line of the tubular concrete product. Made it possible.

[Brief description of drawings]

FIG. 1 is a side view of a mold 1 according to an embodiment.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an explanatory view of a demolded state of the mold 1;

FIG. 4 is an explanatory diagram of a demolded state of the mold 1;

FIG. 5 is an explanatory diagram of an oval tube.

FIG. 6 is an explanatory diagram of a circular tube.

FIG. 7 is an explanatory diagram of a production line for the tubular concrete product 15.

FIG. 8 is a cross-sectional view in the width direction of a mold 20 of a conventional tubular concrete product.

FIG. 9 is a longitudinal cross-sectional view of the form 20.

FIG. 10 is a cross-sectional view in the width direction when the mold 20 is released from the mold.

FIG. 11 is a longitudinal cross-sectional view of the mold frame 20 at the time of demolding.

[Explanation of symbols]

1 formwork 2 wife board 3 openings 4 side plates 5 hinges 6 Bottom plate 7 Internal type 8 Aperture mechanism 9 hinges 10 conveyor 11 conveyor 12 pushers 13 pedestal 14 curing room 15 Tubular concrete products 16 oval tubes 17 Round tube 18 cavities 20 formwork 21 wife plate 22 Side plate 23 Bottom plate 24 Internal type 25 Aperture mechanism 26 Hinge 27 cavities

Claims (4)

[Claims] 1. A bottom plate and two gable plates which are arranged to face each other.
In a form of a tubular concrete product having an outer die formed in a box shape with a number of side plates and an inner die having a tubular shape and having both ends fitted and held in openings provided in the end plate, the end plate is a divided part. The upper and lower gables are hinged to the lower gable so that they can be opened by tilting outward. 2. The formwork according to claim 1, wherein the tubular concrete product is an oval tube having a through hole having an oval cross section, and the dividing portion of the gable plate is a horizontal plane passing through the through hole.
Formwork of a tubular concrete product, characterized in that the through-hole has an oval tangential line in a vertical portion or in a horizontal plane passing therethrough. 3. The formwork according to claim 1, wherein the tubular concrete product is a circular pipe having a through hole with a circular cross section, and the dividing portion of the end plate is a horizontal plane passing through the through hole.
Formwork of cylindrical concrete product, characterized by being on the horizontal plane passing through the center of the circular shape of the through hole or the lower side thereof 4. A step of filling concrete into the formwork according to claim 1, 2 or 3 and hardening it, and a step of removing the outer mold and taking out a tubular concrete product containing the inner mold from the outer mold. And a step of removing the inner mold from the tubular concrete product, and manufacturing the tubular concrete product.