JPH0673202U - Remaining concrete formwork material - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide a concrete formwork material which is less likely to be damaged at the end of a tree during construction and is as easy to use as a product made of plywood. [Structure] The side surface of the concrete body 1 is provided with tapered engaging projections 2 and 3 and tapered engaging recesses 4 and 5, and notches 6 for inserting a tightening screw rod are provided at four corners. 7, 8 and 9 are provided, and holes 12 for forming a proper number of holes for inserting the tightening screw rods are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a formwork material for a concrete structure, and more particularly to a formwork material which is integrated with cast concrete and left as it is after being hardened.

[0002]

[Prior art]

 As is well known, plywood has been widely used as a formwork for concrete, but in recent years, from the perspective of protecting tropical rainforests, it has become a worldwide practice to replace plywood as a formwork material for concrete with other materials. Have different needs.

In order to meet this need, formwork materials made of various materials such as concrete-based, metal-based, and resin-based materials have been developed as plywood concrete formwork materials.

As a concrete-based plywood substitute form material, a half-PC construction method, an HMC form construction method, a GRC form construction method and the like have been developed and put into practical use.

The half-PC construction method is a construction method in which a concrete plate having a thickness of 50 to 70 mm reinforced by truss bars or the like is assembled on site and then concrete is poured and integrated. The HMC formwork method and GRC formwork method are methods in which concrete is reinforced with resin or glass fiber to form high-strength concrete, and the same method of use as the half-PC method can be used with a thickness of about 20 mm.

The features of these construction methods are:

Labor saving in the field can be achieved as compared with a plywood formwork.

The construction period can be shortened as compared with the plywood form.

And the like. On the other hand, as a problem,

Since it is produced by pouring or spray molding, and there are many kinds of sizes, the productivity is low and the cost is high.

In the case of transportation by truck, transportation efficiency is poor because it is impossible to stack U-type L-type and the like on top of each other.

Difficult to process.

The application is limited to a large-scale site where there is room on site.

And the like.

[0015]

[Problems to be solved by the device]

 It is an object of the present invention to provide an easy-to-use residual concrete formwork that does not have tree edges damaged during construction.

[0016]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and the first invention is to provide an engaging projection and an engaging recess on a side surface of a concrete body, and taper one or both of them. According to the second invention, the plate-shaped residual concrete formwork material according to the present invention is further provided with notches for inserting the fastening screw rods of the separator at four corners. The third invention is that the plate-shaped residual concrete type mold material according to the present invention is provided with holes for forming an appropriate number of holes for inserting the tightening screw rods.

[0017]

[Advantageous Effects] According to the first invention, it is possible to perform the engaging work with the adjacent formwork without damaging the tree ends during construction. Further, according to the second invention, when the mold is assembled, a hole for inserting a tightening screw rod is formed in the abutting portion of the mold without using a drill. According to the third invention, the tightening screw rod insertion hole can be easily opened at a predetermined position, and the poured concrete intrudes into the hole to strengthen the adhesion between the cast concrete and the formwork.

[0018]

【Example】

 The drawing shows an embodiment of the present invention, FIG. 1 is a front view of a plate-shaped form member, FIG. 2 is its plan view, FIG. 3 is an enlarged cross-sectional plan view, and FIG. 4 is an enlarged view of the four corners of FIG. Is a plate-shaped concrete body.

The plate-shaped concrete main body of the example was prepared by adding 10 to 40% by weight of ultra-light aggregate, 2 to 8% by weight of fibers having a length of 10 to 25 mm, and an appropriate amount of water to cement. Kneaded and kneaded, and the mixture was put into a pressure dehydration molding machine so that the water-cement ratio became 25 to 45% by weight, and the mixture was pressure dehydrated and molded to a thickness of 2 cm. As shown in FIG. 3, convex portions 2 and 3 having a taper T are formed on the sides, concave portions 4 and 5 having a taper T ′ are provided on the adjacent C and D sides, and four corners are provided at the four corners. Cutouts 6, 7, 8, 9 of a quarter arc are provided, and cutouts 10, 11 of a half arc are provided at the centers of the sides B and D. Holes 12 are formed at nine places on the back surface for forming holes for inserting a tightening screw rod having a thin bottom.

FIG. 6 shows a mold material 13 (feature) for the projecting and entering corners, which is molded from the same material as the plate-shaped mold material shown in FIG. 1 or plastic, and is fitted to the convex portion 2 or 3. The concave portion 13a and the convex portion 13b that fits into the concave portion 4 or 5 are provided on the side surface.

Next, the usage thereof will be described. As shown in FIG. 7, the plate-shaped frame material 1 shown in FIG. 1 and the rod-shaped projecting / incoming corner frame material 13 shown in FIG. 6 are assembled as shown in FIG. As shown in FIG. 8, as in the case of a conventional plywood-made formwork material, the separator 14, the foam tie 15, the pad washer 16, the nut 17, the splint 18, the single pipe 19, the press fitting 20, and the nut 21 are attached. The mold 22 is tightened by using it to form the concrete, and the concrete 22 is placed therein.

FIG. 9 is a schematic diagram showing an actual use example. (A) is a beam type, (b) is a column type, (c) is a column + wall type, and each type is Concrete is placed in the frame to construct a structure of beams, columns and columns + walls. In the figure, 23 is an assembly jig.

When the mold material 1 is assembled, since the convex portions 2 and 3 and the concave portions 4 and 5 are provided with taper T and T ′, respectively, as shown in FIG. It is possible to fit the convex portion and the concave portion without losing the wood end.

If the taper T, T'is not provided as shown in FIG. 9B, the wood end will be damaged at the time of fitting.

Further, since the 1/4 circular arc notches are provided at the four corners of the plate-shaped frame material 1, when four plate-shaped frame materials are assembled, the circular arc-shaped tightening screw rods are inserted into the abutting portions. The holes are formed so that the mounting work of the tightening fitting can be performed immediately.

Further, when the fastening metal fitting is to be attached to another position, the screw rod insertion hole can be easily provided by piercing the thin portion 12a of the hole 12 with a drill.

The holes 12 are used on the concrete pouring side, and when the concrete is poured, the holes 12 are filled with concrete, which has the effect of strengthening the adhesion.

[0028]

[Effect of device]

 The formwork material of the example has the following features.

1) Nail driving can be performed as with plywood.

2) It is easy to process, the product can be cut according to the size, and the cut surface can be easily formed with an uneven portion by using a dedicated processing machine on site.

3) Since it is a concave-convex engagement method, it is easy to install and has excellent surface finish.

4) Since the engaging convex portion and the concave portion have a taper, the product can be built in while tilting the product obliquely without damaging the wood end at the time of construction.

5) A hole 12 for a binding fitting used when the concrete lateral pressure is large is provided, and this hole is closed by the thin portion 12a, so there is a risk of leakage when not in use. Since there is no hole, and there is a hole on the concrete pouring side, it has the effect of strengthening the adhesion with the poured concrete. Further, when used, the thin portion 12a can be easily penetrated by a drill, and can be used as a hole for a binding bolt.

[Brief description of drawings]

FIG. 1 is a front view of a plate-shaped frame material of an example.

FIG. 2 is a plan view of FIG.

3 is an enlarged cross-sectional view of FIG.

FIG. 4 is an enlarged view of four corners of FIG.

FIG. 5 is an enlarged front view of the abutting portion of the abutting plate-shaped frame members.

FIG. 6 is an end view of the projecting / entering corner mold material of the embodiment.

FIG. 7 is an enlarged cross-sectional view of an assembly example.

FIG. 8 is an enlarged vertical side view of an example of assembly.

FIG. 9 is a schematic view showing an actual usage example.

FIG. 10 is a diagram for explaining the operation of the engaging convex portion and the concave portion.

[Explanation of symbols]

 1 Concrete main body 2,3 Convex part 4,5 Concave part 6,7,8,9 Notch 10,11 Notch 12 Hole 13 Forming material for exit and entry corners 14 Separator 15 Form tie 16 Pad washer 17,21 Nut 18 pier 19 single pipe 20 holding metal fittings 22 concrete 23 assembly jig

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Takehito Tezuka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Hiroshi Yokota 1-1-1 Tsukimi-cho, Kumagaya-shi, Saitama Prefecture Chichibu Cement Co., Ltd. Central Research Institute (72) Inventor Masao Kanesashi 2-1-1 Tsukimi-cho, Kumagaya-shi, Saitama Prefecture Chichibu Cement Co. Central Research Institute (72) Inventor Ikuo Uchida, Tsukimi-cho, Kumagaya-shi, Saitama Prefecture Chome 1-1 Chichibu Cement Co. Central Research Laboratory

Claims (3)

[Scope of utility model registration request] 1. A residual concrete formwork material, characterized in that an engaging projection and an engaging recess are provided on a side surface of a concrete body, and either one or both of them are tapered. 2. The plate-shaped residual concrete mold according to claim 1, wherein notches for inserting a tightening screw rod of a separator are formed at four corners of the plate-shaped residual concrete mold. Frame material 3. The plate-like residual concrete formwork material according to claim 2, wherein a hole for forming an appropriate number of holes for inserting a tightening screw rod is provided. Remaining concrete formwork material.