JPS6374604A - Formwork for centrifugal-force molding of concrete - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for attaching and detaching an annular member to the formwork, which is fitted onto the outside for rolling contact with a roller for rotating the formwork during rotational molding of a cylindrical formwork. This invention relates to a formwork for centrifugal force forming of concrete, which reduces equipment costs and improves productivity by providing a formwork for concrete.

[Conventional technology]

As a conventional formwork for centrifugal force forming, for example,
There is one disclosed in Japanese Patent No. 111400. This is shown in Figures 5-7. This formwork 1 is configured to form a cylindrical shape by combining an upper mold 2 with a semicircular cross section and a lower mold 3 of the same shape, and reinforcement is provided at the joint between the upper mold 2 and the lower mold 3, respectively. 4. Binding material with a cross-sectional shape that also serves as 4. 5. 5
are installed symmetrically as shown in the figure, 4 and 4,
5 and 5 are fastened together to integrate the upper mold 2 and the lower mold 3 into a cylindrical mold frame 1. A reinforcing member 6 is fixed by welding or the like in the generatrix direction of the upper and lower frames 2°3. 7 is a reinforcing member fixed in the circumferential direction of the formwork and forming an approximately 1/4 ring.

Reference numeral 8 denotes a semicircular roller bearing with a T-shaped cross section, which is fixed by welding or the like to the binding materials 4, 5 and reinforcing material 6 of the upper mold 2 and lower mold 3, respectively, so that the upper and lower molds are integrated. When this happens, it becomes a circular ring, and this formwork 1 is formed! 5! The rollers 9a and 9b are placed and rotated in rolling contact with each other.

The procedure for forming concrete using a formwork with such a configuration is usually to charge uncured concrete into the lower mold 3, and then connect the upper mold 2 and the lower mold 3 with the binding material 4.5 as described above. to form a cylindrical formwork 1.

Next, this formwork 1 is placed on rollers 9a and 9b with the axial directions parallel to each other and the roller bearings are placed through the part 8. For example, the roller 9a is driven by a motor or the like to apply a predetermined centrifugal force to the formwork 1. When it rotates at a speed that produces , the concrete inside is pressed against the formwork walls by centrifugal force, compacting it and forming it.

[Problem that the invention seeks to solve]

However, in the conventional molding frame, the roller receiver portion 8 is fixed to the upper and lower frames 2, 3 by welding or the like, so that it cannot be removed even during the curing process after molding. In the curing process, the concrete before demolding is immersed in a hot water tank for a long time while still in the formwork, but the diameter of the formwork is large enough to accommodate the roller holder, so when the roller holder does not have a part. The immersion quantity is significantly smaller than that of the formwork.
There was a problem with low productivity.

The present invention has been made in view of these conventional problems, and an object of the present invention is to solve the above problems by making the roller receiver removable.

[Means for solving problems]

This invention provides centrifugal force forming of concrete in which an annular member is removably provided on the outer periphery of the formwork and is fitted in the circumferential direction in order to support the formwork and make rolling contact with rollers that hold the cylindrical form. It was used as a formwork.

[Effect]

A cylindrical form into which concrete is charged and an annular member attached is placed on a form rotation roller so that the annular member rolls into contact with the cylindrical form, and the form is rotated. The concrete inside the formwork is compacted and shaped by the centrifugal force generated by the rotation. After the molding is completed, the annular member is removed from the mold and the mold is sent to a curing process. The formwork from which the annular member has been removed can be stored in the curing tank with the upper and lower cylinders in contact with each other, so the cross-sectional area is proportional to the square of the difference in outer diameter compared to when the annular member is included. Since it is smaller, the capacity can be significantly increased and productivity can be improved.

〔Example〕

The present invention will be explained below based on the drawings. 1 to 4 are diagrams showing an embodiment of the present invention.

First, the structure will be described. Reference numeral 11 denotes a formwork body having a more arcuate cross section, and 12 a lid having a less arcuate cross section that closes the opening of the main body 11. 12a and 12b are reinforcing members fixed to the edge of the lid 12, and the reinforcing member 12a is rotatably attached to the reinforcing member 11a fixed to the edge of the form body 11 via a hinge 13 together with the IE 12. There is. Also, M12 reinforcement material 1
2b and the reinforcing member 11b fixed to the opening edge of the main body 11 pass through the pin 14 and are locked together. 15 is a reinforcing material, and the reinforcing materials 11a, llb, and 12a are mentioned above.

Like 12b, it extends over the entire length of the formwork body 1 along its generatrix. Reference numeral 16 denotes vibration-exciting protrusions, which are attached in large numbers at intervals in the circumferential direction on the outer periphery of the cylinder formed by the form body 11 and 1fE12. Further, the heights of each of the reinforcing members and the vibration protrusions in the radial direction of the mold body are substantially equal.

Reference numeral 17 denotes a ring as an annular member, which is composed of two arcuate semicircular rings with one end rotatably attached to each other, and a connecting hole 17a is provided at the other end, and a pin or the like can be passed through the ring to connect the formwork 10. Fit it onto the outside and fix it (see Figure 2 (a) and (b)). A plurality of rings 17 are fitted around the formwork 10 in the longitudinal direction thereof, and rotate the formwork by rolling into contact with the formwork rotation rollers 21 and 22. Although the coupling hole 17a is oriented in a direction parallel to the axis of the formwork 10, this direction may be parallel to the tangent to the ring 17 or may be in another direction. Various shapes and structures of the pins etc. inserted therein can be adopted as long as they do not come off when the formwork 10 is rotated. Furthermore, it is also planned that the insertion and removal of the pins, etc., will be performed using mechanical force such as an air cylinder, if necessary.

The rollers 21 and 22 are equipped with rubber tires, of which the roller 21 is fixed to a shaft 26 driven by a motor 23 via a belt 24 and a pulley 25 and rotates in a fixed position, and the roller 22 is fixed at a right angle to the shaft 26. direction(
It is rotatably supported on a base 27 which is movable in the direction of the arrow.

In equipment with the above configuration, piles, hump pipes,
The procedure for forming a concrete product such as a telephone pole is first to place the form body 11 in a state with its opening facing upward and to open the lid 12. Next, reinforcing bars are inserted into the main body 11, and if prestressing is to be applied to these reinforcing bars, a jig for this purpose is attached, and unhardened concrete is then charged. This charging is carried out along the length of the form body 11, but since the body 11 has a well-curved cross section, the edge of the opening is located high, so even if a predetermined amount of concrete is charged, it will not reach the height of the edge. There will be no overflow, and no fine aggregate will be caught when M12 is closed.

When charging of concrete is completed, M12 is closed, the ring 17 is fitted onto the formwork 10, and a pin or the like is passed through the joint hole 17a and fixed. Next, the formwork 10 is placed on the rollers 21 and 22 so that the axial directions are parallel to each other and the ring 17 is in rolling contact with the rollers 21 and 22.
is driven to rotate the formwork 10 via the rollers 21. The rotating formwork uses centrifugal force to compact the concrete inside and perform centrifugal forming.

Once the concrete has hardened, the ring 17 is opened and removed from the formwork 10, and the formwork is sent to a curing process. The ring 17 can be opened by pulling or pushing the inside of both halves open using jacks or the like. It is also possible to open the interiors of both halves by turning the joint hole 17a upward and jacking up the pivot joint located below from below. The diameter of the formwork 10 from which the ring 17 has been removed has been reduced by twice the radial thickness of the ring 170, and the capacity of the formwork during the curing process has been reduced compared to the conventional formwork with the ring still attached. increases significantly. On the other hand, the removed ring 17 is charged with uncured concrete and then attached to a formwork for centrifugal forming. In addition, the number of rings required in this concrete product manufacturing line is far smaller than the conventional case where they are fixed to all formworks, as they can be removed and used in other formworks after the centrifugal force forming process is completed. A small number will suffice.

When forming concrete by centrifugal force, depending on the product, vibrations are applied at the same time as the formwork is rotated in order to uniformly compact and form the concrete. In this case, as shown in FIG. 3, the formwork 10 is placed in rolling contact with the rollers 21 and 22 at the position where the vibration protrusion 16 is provided. Although the ring 17 is attached to the formwork 10 in FIG. 3.4, it is not necessary to use it here. This is because the ring 17 is used to rotate the formwork 10 without imparting vibrations.

Next, a fluid pressure cylinder 31 is interposed between the main column 30 and the horizontal frame 29 pivoted thereto so as to press the upper roller 28 pivoted on the horizontal frame 29 against the formwork 10 with an appropriate pressure. (See Figure 4). At this time, the position of the roller 22 is determined by appropriately moving the base 27 depending on the outer diameter of the formwork 10 and the opening angle between the main pillar 30 of the horizontal frame 29.

The formwork 10 is pressed by the upper roller 28 when the formwork 10 is pressed by the rollers 21.
This is to suppress bouncing of the formwork that occurs when vibration is applied to the formwork 10 by making contact with the formwork 22.

The formwork 10 placed in the above manner can be rotated by the motor 23 as described above and vibrated at the same time, so that the concrete can be uniformly compacted and formed by centrifugal force.

Moreover, since each roller 21, 22° 28 that comes into rolling contact with the formwork 10 is provided with a rubber tire, the noise during rotation is small and the impact is alleviated, so that the formwork 10 is not damaged.

It is preferable to provide the outer circumferential surface of the ring 17 with means such as attaching a vibration-proof rubber plate with wrinkles to prevent slippage during rotation with the rollers 21 and 22.

[Effects of the Invention] As explained above, according to the present invention, the annular member that fits around the outer periphery of the formwork in the circumferential direction can be detachably attached in order to make rolling contact with the rollers that support and rotate the formwork. Because of the built-in formwork, the capacity in the curing process is significantly increased, which greatly improves productivity, and because only a small number of annular members are needed,
The effect is that the equipment cost is small. In addition, for molds with vibration protrusions formed on the outer periphery of the formwork, it is possible to perform molding by rotation alone by attaching an annular member, and by removing the annular member, molding can be performed by both rotation and vibration. Can be molded.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a molding frame according to the present invention, and FIG.
) is a front view of the annular member of the example, and (in the same figure) is the same figure (al
3 is a top view of the main part of the embodiment, FIG. 4 is a view taken along the line B-B in FIG. 3, and FIG. 5 is a side view of the conventional example.
6 is a sectional view taken along line CC in FIG. 5, and FIG. 7 is a partial sectional view taken along line DD in FIG. 6. I, 10... Formwork, 8, 17... Annular member, 9a, 9b, 21, 22-----1:l
-La. Patent Applicant Hiroshi Kitamura Agent Patent Attorney Tetsuya Mori Attorney Yoshiaki Uchi Patent Attorney Tadashi Shimizu Figure 4

Claims (1)

[Claims] A mold for centrifugal force forming of concrete, characterized in that an annular member that fits in the circumferential direction is removably provided on the outer periphery of a cylindrical formwork in order to make rolling contact with a roller that supports and rotates the cylindrical formwork. frame.