JPH0689524B2 - Heavy-duty precast concrete product platform - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a fabrication table for use in the manufacture of heavy precast concrete products, such as precast concrete girders for bridges.

(Prior Art) Conventionally, a production stand for a heavy precast concrete product such as a precast concrete girder used as a main girder of a bridge is constructed by excavating the ground 1 of a production yard as shown in FIGS. 4 to 5, It is common to build a split stone foundation 2 on the bottom, and then place a concrete foundation 3 on it.
A form supporting member such as a rectangular member 4 and a rafter 5 is placed on the upper surface of the concrete foundation 3, and a manufacturing form 6 is supported on the form supporting member.

In addition, this type of production table is installed in the production yard near the installation site of the precast concrete girders that will be used only during the construction period because of the transportation problems of the manufactured products. Removal is required.

(Problems to be solved by the invention) The conventional production table as described above has a large number of work steps such as excavation of the ground, construction of a split stone foundation, and curing of a concrete foundation. A skilled engineer is required, but especially in recent years, there are many cases where construction is hindered due to lack of engineers.

In addition, since it takes a lot of labor to destroy and remove the concrete foundation after the production of the required number of concrete products and it cannot be reused, it is necessary to treat it as industrial waste, but in recent years it has become difficult to treat it. However, the disposal costs a lot of money.

Furthermore, precast concrete girders for main girders of bridges may be molded into a shape with the central part raised in advance in consideration of bending during erection.In such cases, the height of the formwork is determined by the concrete foundation. Had to be done separately from the above, and there was a problem that an expert engineer was required for this as well.

In view of such conventional problems, the present invention can be easily installed in a short time even if not a skilled engineer,
It is easy to remove, can be relocated and reused, and can greatly save the cost required for the production table.
The purpose of the present invention is to provide a heavy-duty precast concrete product production stand where the height of the formwork installed on the production stand can be easily adjusted at each part.

(Means for Achieving the Object) The characteristics of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are a sand layer laid on a base appropriately,
A large-weight precast including a plurality of steel plates laid side by side on the sand layer, a plurality of pillars protruding from the upper surface of the steel plate and having an adjustable upper end height, and a form supporting member installed on the pillar. Located on a concrete product production table.

(Operation) This production table lays a sand layer on an existing base such as the ground,
By laying an iron plate on the upper surface, the load from the support is distributed over the entire bottom surface of the iron plate and applied to the ground, so that even heavy objects can be supported without sinking.

Further, since the height of the upper surface of the support pillar can be adjusted for each support pillar, the levelness of the bottom surface of the formwork or the required degree of curvature can be set as necessary even if the base is uneven.

(Embodiment) Next, an embodiment of the present invention will be described with reference to Figs. 1 to 3, in which 10 is a base. A sand layer 11 is laid on the base 10, and a large number of iron plates 12 of a certain size are laid on the base 10 in line according to the size of the product to be manufactured.

The base 10 only needs to have a certain level of levelness, has a strength to the extent that a normal ground surface is roughly leveled and the surface is crushed by a small roller, and the surface may have some irregularities. If the surface is already paved,
Use it as it is.

The sand layer 11 is for burying a gap between the lower surface of the iron plate 12 and the upper surface of the base plate 10 so as to evenly transfer the load applied to the iron plate 12 to the base plate over the entire lower surface, and is laid in a thickness of about several centimeters.

Each iron plate 12, 12 ... is composed of a large number of columns 13,
13 ... is projected.

As shown in FIG. 3, the columns 13 have a large space between the concrete products where the load is large and the number of the columns is increased so that the corresponding yield strength can be obtained. This prop
In the present embodiment, as shown in FIG. 2, reference numeral 13 denotes a bolt 15 which is penetrated from the lower surface side to the upper surface side of the iron plate 12 and fixed by a nut 14, and a long nut 16 screwed into a tip portion of the bolt 15. It consists of Also, long nut 16
A U-shaped liner plate 16a supporting a wooden frame 17 forming a frame supporting member is fixed to the upper end of the frame by welding.

The wooden frame 17 is composed of a timber 18 made of wood and a rafter 19 fixed on the rafter 19 in an orthogonal arrangement, and a bottom template 21 of a concrete product form 20 is placed on the rafter 19.

In the production table configured as described above, the support columns 13 are preliminarily provided on the iron plate 12, the iron plate 12 is laid on the base plate 10 with the sand layer 11 interposed therebetween, and then the long nuts 16 of the respective support columns 13 are rotated. Make the required height, for example, the height of the top surface of all columns 13, the bottom template.
If the bottom formwork 21 is curved up and down, adjust the height for each strut 13 according to the curved surface of the bottom formwork, and then place the wood on it. The formwork 20 is supported via the frame 17.

Incidentally, in the above-mentioned embodiment, the bolt is projected on the iron plate 12 as the pillar 13, but in addition to this, a long nut is projected on the iron plate,
A bolt with a liner plate may be screwed into this.

In addition to the wooden frame 17 described above, various types of frame support members can be used, and the liner plate 16a uses a liner plate 16a according to the shape of the frame support member, but may not be used in some cases. .

(Effects of the Invention) As described above, the heavy-weight precast concrete product production stand of the present invention has a large number of iron plates laid side by side on a desired base with a sand layer interposed between them, and the formwork is formed on the pillars protruding from the iron plate. Since it supports the equipment, it can be installed in a shorter time than the conventional construction of basic concrete, and it can be easily installed even by an unskilled technician, and it can be removed simply by carrying away the iron plate. However, since the work is remarkably simplified and can be moved to another place and reused, it is economical and does not cause a problem of industrial waste treatment.

In addition, since the formwork is supported on a column whose top height can be adjusted, the levelness of the formwork and, in some cases, the degree of curvature of the bottom face can be easily adjusted,
The height of each part of the mold can be easily adjusted without requiring skill.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show an embodiment of a manufacturing table according to the present invention. FIG. 1 is a vertical sectional view, FIG. 2 is a partially enlarged sectional view, and FIG. FIG. 4 is a partial plan view showing the arrangement of the iron plate and the support, FIG. 4 is a vertical sectional side view of a conventional example, and FIG. 5 is a sectional view taken along the line AA in FIG. 10 …… Base, 11 …… Sand layer, 12 …… Iron plate, 13 …… Pillar, 14
...... Nuts, 15 ...... Bolts, 16 ...... Long nuts, 16a
...... Liner plate, 17 …… Crate, 18 …… Square beam, 19
…… Rafters, 20 …… Forms, 21 …… Bottom template.

Claims (2)

[Claims] 1. A sand layer appropriately laid on a base, a plurality of steel plates laid side by side on the sand layer, a plurality of protrusions provided on the upper surface of the steel plate and having an adjustable upper end height, and on the struts. A heavy-duty precast concrete product production stand comprising the installed formwork support member. 2. The column comprises a bolt projecting from the upper surface of a steel plate and a long nut screwed into the bolt to adjust the height of the top surface by screwing back and forth. The heavy-duty precast concrete product production table described.