JPH0663610U - Abandoned formwork - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a corrosion-resistant discard formwork for concrete construction, which can obtain sufficient rigidity even with thin-walled panels and is inexpensive. [Structure] A concrete layer 3 is formed on the inner surface of a thin resin panel 2, and a plurality of bolt studs 4 and connecting fittings 5 are planted in the concrete layer 3.

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention relates to a waste formwork, which is used for concrete construction such as bridge piers and port structures, and is integrated as it is.

[0002]

2. Description of the Related Art A conventional formwork for concrete construction is generally formed by combining a plurality of plywood, and is generally removed after the concrete is solidified. However, this type of formwork is troublesome in assembling and disassembling, and is thrown away without being reused, which is a problem from the viewpoint of saving wood resources.

[0003] Therefore, recently, a discarding form has been developed in which the form itself is made of concrete and is integrated with the placed concrete. This is convenient because it does not require removal work, but it is heavy and inconvenient to transport, and the appearance of the structure deteriorates due to exposed concrete, and when the structure is affected by seawater like a pier. Requires waterproofing and anticorrosion treatment after construction.

On the other hand, Japanese Laid-Open Patent Publication No. 3-125734 discloses a resin-made panel and a lightweight mold using a foam material. By using this mold, the problems of removal and appearance are solved. ing.

[0005]

[Problems to be Solved by the Invention] However, in the above-mentioned formwork, if the panel becomes large, it will be distorted and difficult to mount. Therefore, either increase the wall thickness to give rigidity or form a large number of ribs. Therefore, it is necessary to prevent the deformation. Also, many separators and supports must be installed to secure the formwork in place.

The present invention has been made in view of such circumstances, and an object thereof is to provide a waste formwork for a concrete work, which can obtain sufficient rigidity and anticorrosion even with a thin resin panel and which is low in cost. To provide.

[0007]

In order to achieve the above object, the invention of claim 1 forms a mold by forming a concrete layer on the inner surface of a thin resin panel. Further, in the invention of claim 2, a plurality of studs and connecting members are further planted in the concrete layer.

[0008]

The thin-walled panel protects the concrete structure from corrosion, and the inner concrete layer maintains the rigidity of the formwork. In addition, each stud protruding from the concrete layer is welded to the reinforcing bar on the side of the building, and the connecting member connects the forms.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an exploded perspective view of a discard formwork for a bridge pier, its positioning mechanism and a joint material. It is configured.

The panel 2 is formed of a thin FRP into a flat box shape. In this embodiment, the thickness is 3 mm, the height is 30 to 50 mm, and the vertical and horizontal sizes are determined in consideration of the manufacturing process of the formwork and the size of the structure. And determined appropriately. In addition, in order to ensure the safety of ships passing between the piers, the surface of panel 2 can be coated with a reflective coating or a blinking LED can be attached.

The concrete layer 3 is filled up to a position almost the same as the height of the panel 2 in FIGS. 1 and 2, but the filling amount may be such that the rigidity does not deform. In addition, it is desirable to mix aggregate into the concrete to form the unevenness 3a on the surface, or to drive a large number of anchors 6 to increase the adhesion to the concrete on the structure side.

As can be seen from FIG. 2, the bolt studs 4 are for welding with the reinforcing bars 7 on the side of the structure, and are previously planted at the four corners of the concrete layer 3. Further, one plate 8 is fitted to the bolt studs 4 and 4 of the molds which are adjacent to each other, and the molds 1 are aligned and fixed by tightening the nuts 9 and 9. It constitutes the mechanism.

The connecting fittings 5 are for connecting the molds 1 and 1 with the bolts 10 and the nuts 11, and are attached to the four sides of the concrete layer 3 by an anchor method. If the thickness of the concrete layer 3 is smaller than the height of the panel 2, the panel members can be directly connected with bolts or the like without the metal fitting 5, and a part of the panel 2 can be extended upward. It may be a connection part.

The joint surfaces of the molds 1 and 1 are sealed with FRP joint materials 12 and 13 with an adhesive or bolts to stop water. The joint material 12 is used at a position where the four molds 1 are in contact with each other, and the corners of each mold 1 fit into the cross-shaped pieces 12a. If the molds 1 are alternately attached to the structure as shown in FIG. 3, the joint material 14 with the T-shaped piece 14a as shown in FIG. 4 may be used. The elongated joint material 13 has a T-shaped cross section so as to fit each side of the formwork 1. Since each joint material 12, 13, 14 has such a shape, not only is the seam of the formwork 1 completely covered to improve the water blocking effect, but also the positioning of the formwork when mounting it. Play a role. Reference numeral 15 is a support work for pressing the formwork 1 from the outside, which is sequentially connected every time the formwork 1 is attached.

Next, the mounting order of the formwork 1 will be described with reference to FIG. 2. First, the joint material 12 is fixed to the right corner of the existing formwork 1, and the bolt 1 stud 4 of the next formwork 1 is attached to the plate 8. Insert the left corner into the joint material 12 while passing through the hole. Next, the tip of the bolt stud 4 is welded to the reinforcing bar 7 on the structure side, and the nut 9 on the plate 8 is tightened so that the molds are aligned with each other.

Next, with the plate 8 and the nut 9 attached to the bolt stud 4 on the right side of the mold, the tip of the stud is welded to the reinforcing bar 7, and the nut 9 is tightened so that the plate 8 contacts the edge of the mold 1. Next, the joint materials 12 and 13 are fitted around the form 1, and the outer side is fixed by the support 15.

In this way, the formwork 1 is sequentially mounted around the rebar 7, and the inside is filled with concrete and solidified. The expansion pressure of the concrete is supported by the supports 15, and the close contact of the formwork 1 with the concrete layer 3 is made by the uneven surface 3 a and the anchor 6. If the support 15 is removed at the end, a concrete pier covered with plastic will be completed, and this pier will be a structure with excellent corrosion resistance and aesthetics. The waste formwork of the present invention can also be applied to concrete structures other than piers.

[0018]

[Effects of the Invention] As described in detail above, the discarding formwork of the present invention has sufficient rigidity even though it is a thin-walled panel. can get. Also, since the studs extend from the concrete layer and can be fixed to the reinforcing bars on the side of the structure, a large number of separators can be omitted or reduced during assembly.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a discarding mold, a positioning mechanism, and a joint material.

FIG. 2 is a cross-sectional view of the discarding mold in the attaching process.

FIG. 3 is a front view of the discarding molds mounted alternately.

FIG. 4 is a perspective view of another joint material.

[Explanation of symbols]

 1 Formwork 2 Panel 3 Concrete layer 4 Bolt stud 5 Connecting metal fitting 8 Plate 9 Nut 12, 13, 14 Joint material

Claims (2)

[Scope of utility model registration request] 1. A discarding formwork characterized in that a concrete layer (3) is formed on the inner surface of a thin resin panel (2). 2. The waste formwork according to claim 1, wherein a plurality of studs 4 and a connecting member 5 are planted in the concrete layer 3.