JPS62206164A - Mold frame apparatus for collumnar structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork device for concrete used when constructing a columnar structure 1 having a curved outer surface, which is represented by a circular column made of reinforced concrete. The present invention relates to a formwork device for a columnar structure, which includes a large number of formwork units assembled on the outer periphery of a body, and a fastening means for fastening the formwork against the lateral pressure during concrete IJ-casting.

Conventional technology Conventionally, as the next formwork for forming a concrete structure with a circular cross section, an approximate polygon was assembled using narrow plates, or a hollow cylindrical body was used as a weir plate, and the formwork was used to form a column. Attach shape-retaining bone plates from the entire outer surface at intervals in the axial direction, add bata material to the outside, tighten the opposing bata materials with fastening hardware, and pour concrete inside the sheir. I try to do that. At this time, the bone plate is used horizontally on the outer side dividing the circumference into 4 or 6, the inner side edge is cut out in an arc shape, and a curved surface is formed on the inner surface, so that reinforcement can be applied from the outside of the weir plate. The sections that protrude outward from the panels are assembled together to form a horizontal flap, and the vertical flaps are attached from the outside and the bolts are fastened to the opposing vertical flaps. They are spread over each other and tightened to withstand the lateral pressure of poured concrete. The bone plates at this time were called ``comb-shaped'' in ancient times because of the technique of forming curves with the tips of many short plates, and were used as a formwork device that was commonly used when paving curved or uneven surfaces. Using well-known techniques, they have been manufactured and used on-site to accommodate special surfaces.

In addition, as weir plates, we use Aishakuri or Honjitsu-processed plates to achieve watertightness, and recently we are using flexible materials molded into cylindrical bodies of various diameters, such as Fuji Void. The cylindrical material known by the name is suitable as a temporary formwork. In the above-mentioned comb-shaped formwork, the assembly and tightening are done from the outside of the formwork, and its strength is used to counteract the internal pressure of the concrete.

In a circular formwork that uses comb-shaped bone plates, it takes a lot of time to make the comb shape to form a curved surface, and in the case of a wooden formwork, D-loe costs for the side edges of the plate material are added. Products that use a cylindrical body such as Fuji Void reduce the labor involved in assembling the formwork, but since it is a poured material for concrete sheathing, it cannot be used as a material like wood, and the cost of materials increases. However, the biggest drawback is that a cylindrical product with arbitrary dimensions cannot be obtained, and even the design dimensions of the structure are restricted. In terms of the surface finish of poured concrete, wooden ones are limited to forming a base for coating, etc., and with ``7 Giboid'' it takes time to remove the mold to obtain a good surface.

Since horizontal formwork is assembled from the outer periphery of the formwork, stable assembly is completed only after the tightening bolts are installed and fastened between the opposing vertical pieces.
Handling during formwork assembly also had the disadvantage of requiring a large number of workers. Also, generally speaking, ordinary separator-type fastening hardware is not suitable for cylinders whose opposing surfaces are not parallel.

The present invention is aimed at eliminating the problems of the prior art, and uses a panel-shaped formwork unit with metal plates stretched as the weir plate, and as a means for assembling and tightening it. A formwork device is constructed by attracting opposing unit bodies directly from inside using a separator method and adding a hoop-like binding means to the outer periphery. The main idea is to deal with the characteristics, and each unit is assembled by pulling each unit from the inside along multiple diameters using radial tie rods that meet at the center, and chains, etc. are wrapped around the outside of the formwork unit. It is characterized by the fact that the internal pressure of the concrete is distributed evenly (distributed to each unit) and a unique surface of the metal plate is formed.

Example The present invention will be explained in detail based on drawings of embodiments.

Figure 1 shows (1) the assembled state of the formwork device of the present invention;
(2) The figure shows a side view and a horizontal cross-sectional view, respectively, where 1 is a circular column made of reinforced concrete to be constructed, 2 is a large number of main reinforcing bars, and 21 is a rib (hoop). The formwork device for constructing the column 1 is generally indicated by 3, and the formwork device 3 is an arc-shaped formwork unit that divides the outer periphery of the column 1 into an appropriate number and is formed at a fixed length in the height direction of the column. body 4, and a large number of fastening hardware 5, 5 when the four illustrated unit bodies are assembled as a circular formwork,
Bondage material 6 wrapped around the outer periphery of the unit in a multi-stage K “hoop” shape
It consists of

The above-mentioned constituent members are clearly explained in detail with respect to the formwork unit 4 and the fastening hardware 5, respectively, with reference to FIGS. 2 and 3. In FIG. 2, the formwork unit 4 consists of a metal plate 41 and a crosspiece 42 attached to the outer surface of its longitudinal side edge, and its length is 1.8 m based on the standard length of the metal plate. The width is determined by the dimensions assigned to the outer circumference of the cylinder. For example, when a cylinder with a diameter of 750 cm is divided into 4 parts, the result is 58911111, which can be cut using 600101 as a reference. Reference numeral 43 denotes an auxiliary frame provided between the pair of crosspieces 42, which reinforces the intermediate portion of the metal plate 41.
It may be attached first to the panel-shaped formwork unit 4 having side frames, or it may be attached afterwards after the unit is assembled.

The number of seven is set according to the number of divisions for the entire circumference of the column of the unit body,
The distance between the auxiliary frames 43 or between the auxiliary frames 43 and the side frame 42 is set to about 300 to 450 mm, corresponding to the thickness of the metal plate 41. An insertion hole 44 is formed at the upper terminal edge of each row corresponding to the mounting position of the auxiliary frame 43 and at least one point between them. The metal plate 41 is preferably a flexible galvanized iron plate with a thickness of 0.23 fi to 1,0
It is curved at a predetermined curvature as f+I11.

Next, the fastening hardware 5 will be explained with reference to FIG. Fastening hardware 5
The rod as shown in Fig. 3 (1) is placed at the center point 0'ft:
As a reference, they are constructed by overlapping in the radial direction as shown in FIG. 3(2). (1) In the figure, 51 is the center hole 52
A connecting tool integrally formed with a spectacle part 53 having a screw hole 53 and a socket part 55 having a female threaded hole 54, the sotet f! After screwing one end of the tightening bolt 56 into 1555,
(1) As seen in the side view at the bottom of the figure, two connectors 51
The spectacle parts 53 and 53 are stacked vertically and a bolt nut 57 forms one fastening rod 58. The other end of the tightening bolt 56 is provided with a tightening means 7 for engaging the material B to be tightened using a commonly known type of separator.

In the right view of FIG. 3 (1), the tightening means 7 may be a nut screwed into the abutting seat plate 71 to the member B and the threaded end of the tightening bolt 56, but as shown in the figure, the tightening means 7 An insertion hole 73 is provided in the flat part 72 near the tip of the plate wedge 7.
4e It is preferable to use the driving type.0 As shown in FIG. 3(2), the binding rods 58 formed in this way are combined radially along a predetermined number of diameters passing through the center O, and are used as radial separators. A fastening hardware 5 is obtained.

One set of fastening hardware 5 is applied to the upper and lower portions of the form unit 4, and a predetermined number of fastening hardware 5 are applied to intermediate stages thereof.

The bondage 1fI6 shown in FIG. 1 is a wire material that circumscribes the side frame 42 and the auxiliary frame 43 and is wound around the outer periphery of the formwork assembly,
Attach both frame materials as vertical flaps near their upper and lower ends. The material can be simply wire, twisted wire, steel band, etc., but in this example, a chain is used to tighten the entire formwork. The means for joining the ends of the turns is optional.

The tying means in the present invention means the tying hardware 5 and the tying material 6 together.

Function: The function of the formwork device of the present invention and how to use it will be explained in the order of steps with reference to FIG.

First, in a preparation step, a predetermined number of frame frame units 4 are prepared. These units 4 are either newly constructed or repurposed from those used in the previous stage of the trench construction for pillar 1.

On the other hand, in the same preparation process, the fastening hardware 5 was fixed to the fastening rod 58°58.
Make preparations until you have assembled them radially.
This is the 4th F! ! J(1)K As shown, each connecting rod 58
are arranged so as to pass between the main reinforcing bars 20 of the column 1, and the tightening bolts 5G are temporarily placed on the hoop reinforcing bars 21.

In FIG. 4(2), the formwork unit 4 is erected. Once the unit body 4 is aligned with the lower one and connected to the upper part in a "vertical" manner, the tip of the tightening bolt 56 is inserted into each insertion hole 44, and the cow and the cow are attached to each other. Although it has spread to
Since the radial fastening hardware 5 is not fixed inside, there is no difficulty in inserting it into the insertion hole 44 when building the unit 4 from the outside.

As the assembly of the unit body 4 progresses, it is only necessary to slightly rotate the tightening bolt 56 with the box part 53, and then rotate the inner end of the bolt 56 to -
(socket) g55, and insert unit 4 in the specified direction.
It is also possible to insert it through the hole and screw it again. When the unit bodies 4 on the outer periphery of the column 1 are completed one stage at a time, the side frames 42 of each unit body 4 are joined together, and the seat plate 71 is inserted through the tightening bolt 56 so as to straddle the side frame 42 and abut it. When the plate wedges are engaged, the fastening rod 58 extends straight to fasten the opposed formwork units, and the connecting tool 51 is located at the center of the column 1.

In Figure 4 (3), the entire formwork is tightened. Masu side frame 42
An auxiliary frame 43 is installed in the middle of the frame 43, and is tightened in the same way as the side frame 42. Next, a chain 6 is circumscribed to these frames 42 and 43.
'fr: Wrap it around and tighten the entire formwork while making each frame material act as a vertical butterfly. The following work is repeated from the state shown in Figure 4 (1), and when two or more stages have been assembled to match the height of one concrete pouring, concrete is poured into this formwork device 3 and the column 1 is assembled. Complete construction will proceed. The flow side pressure of the cosiclete that has not yet hardened is transmitted from the unit body 4 to the chain and is evenly distributed.

To remove the mold from the formwork device 3, the binding material 6 is released and the binding bolt 56 is removed.
By folding the outer protrusion, the formwork unit 4 can be easily removed from the mold and used for other purposes. Most of the fastening hardware 5 remains in the poured concrete. After demolding, the concrete surface has the smooth surface unique to full-use plate formwork, and no special release agent is required at this time.

Effects of the Invention The present invention is a formwork device particularly suitable for a columnar structure with a circular cross section. This is achieved by using radial separators along the diameter of the opposing surfaces of the frame, which completely eliminates the use of comb-shaped bone plates that are essential to this type of formwork device. is obtained.

Therefore, the skill level of the workers required for manufacturing the comb shape is not required, the number of man-hours required for this is reduced, and productivity is significantly improved. In addition, since the formwork is formed as a unit using side frames that also serve as batting materials, it is not easy to handle, but it is also easy to handle, and it can be used for many other purposes, and the finished surface of the concrete is smooth. Moreover, even though thin metal plates are used, the use of binding materials equalizes the load on the formwork, which greatly contributes to the construction of columnar structures with special cross sections.

[Brief explanation of drawings]

The drawings show an embodiment of the formwork device of the present invention,
Figure 1 shows the formwork device assembled for circular use;
1) The figure is a side view, and the figure (2) is a horizontal sectional view, outlining the main components. Figure 2 is an external side view of the formwork unit, Figure 3 is an explanatory diagram of the fastening hardware, the top view of (1) is a plan view of the single material of the fastening rod, the bottom view is its side view, and the right view is the end. The left and right figures in (2) are a plan view and a side view of the fastening hardware assembled in the radial separator, respectively, and Figure 4 shows how to use the formwork device (1). It is a schematic perspective view showing the process order of (2) and (8). DESCRIPTION OF SYMBOLS 1... Column, circular column, 2... Main reinforcing bar, 3... Formwork device, 4... Formwork unit, 5... Fastening hardware, radial separator Milo... Bonding material, 41 ...metal plate, 42.
...Side frame, 43...Auxiliary frame, 44...Insertion hole, 51
... Connecting tool, 53... Glasses part, 55... Sotet part, 56... Tightening port, 58... Tightening rod agent Masao Miyake and 1 other person Figure 1 Figure 3 Figure 4 figure

Claims (2)

[Claims] (1) A formwork device used for constructing a reinforced concrete columnar structure with a curved outer peripheral surface, such as a cylinder, which includes a formwork member and a fastening means for fastening the formwork member, The formwork is a unit body having a width that divides the outer layer of the columnar structure into a predetermined number and a predetermined length, and has a flexible metal plate and side frames fixed to both longitudinal edges of the formwork. If necessary, an auxiliary frame is provided in the middle of the side frame to constitute a panel-like formwork unit, and the fastening means is attached to a radial separator having a center at the center of the columnar body and to the outer periphery of the formwork unit. A formwork device for a columnar structure, characterized in that the radial separator is formed by overlapping binding rods that are connected in the radial direction of the columnar body via a connector. . (2) The formwork device according to claim 1, wherein the metal plate is a galvanized iron plate.