JPH02301406A - Frame device for centrifugal molding - Google Patents

Abstract

PURPOSE:To make the inner peripheral surface square similar to the outer surface and manufacture a concrete square cylinder of uniform wall thickness by dividing an inner frame into two or more and arranging the same in the outer frame in a manner that a passage for passing a concrete material between spaced apart inner frames. CONSTITUTION:An outer frame 3 and an inner frame 8 divided into two or more are installed on an end platen 1, and a passage 13 in which a concrete material can flow is formed between adjacent inner frames 8, 8. A set frame device is fixed to a retaining arm component 28 projectingly provided on a rotating disk 27 forming a rotating mechanism 18 by means of a frame fixing means 29. While the rotating disk 27 is rotated by driving a rotor 23, a concrete material is fed via a through-hole 2 of the end platen 1 into a frame device. The concrete material is pressed strongly to the inner wall of the outer frame 3 through the passage 13 by centrifugal force and filled all over the passages between the outer frame 3 and the inner frames 8. Rotation is stopped and given steam curing is carried out to cure the concrete material, and then the frame device is dismantled to manufacture a concrete square cylinder with square inner peripheral surface.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a formwork device for a concrete centrifugal forming machine,
In particular, the present invention relates to a formwork device for a centrifugal molding machine suitable for manufacturing concrete hollow square cylinders by centrifugal molding.

[Purpose of the invention]

One of the methods for obtaining hollow concrete molded products is known as the centrifugal molding method, in which a formwork filled with concrete material is rotated backwards by a driving machine, and the concrete material is molded using centrifugal force. There is.

Internally hollow concrete molded products manufactured using this centrifugal molding method have the advantage of having a dense and clean outer surface and almost no need for surface treatment, so they can be used as fireproof coating materials for steel frames of buildings. It is being considered for use as pipe shafts, ducts, and abandoned form frames for columns in concrete structures, and can also be used as offshore buoys by filling the interior with synthetic resin foam and closing the openings at both ends. It is being considered for use.

However, when using this conventional centrifugal molding method, there is no problem in manufacturing round pipes, but when trying to obtain a molded product with a rectangular cross section and an equiangular cylindrical shape, the mold used is Because it was composed only of the outer frame, even if the outer frame was made into a rectangular tube shape, the inner surface became a circular hollow part due to centrifugal force, and thick parts were formed in some parts, making it difficult to use for various purposes. There was a problem in that it was not possible to meet the requests of

Therefore, the present invention eliminates the drawbacks of the conventional formwork device for a centrifugal molding machine described above, and arranges an inner frame body divided into two or more parts at an appropriate distance from each other inside an outer frame body. so that not only the outer surface but also the inner peripheral surface can be formed into a square shape by the cooperative action of the outer frame body and the middle frame body,
It is an object of the present invention to provide a formwork device for a centrifugal forming machine that is capable of manufacturing a concrete rectangular cylindrical body that satisfactorily meets the demands of various applications.

[Configuration of the Invention] The configuration of the present invention for achieving the above object will be described in detail as follows.
A formwork device for a centrifugal forming machine, in which a formwork disposed between a pair of left and right end plates is rotated by a rotation mechanism, and concrete material filled in the formwork is formed by centrifugal force, The formwork consists of an outer frame having a rectangular cylindrical shape, and a middle frame divided into at least two parts disposed inside the outer frame, and the middle frame has each corner part inside the outer frame. The inner frame is provided within the outer frame so that the corner of the inner frame maintains a predetermined distance from each corner within the outer frame, and After installation, a passage is created between adjacent middle frames to allow the concrete material to flow, and the concrete material poured into the center of each middle frame is moved through the center by centrifugal force. This is a formwork device for a centrifugal molding machine, characterized in that it is configured such that it can enter a space surrounded by an outer frame body and an inner frame body through a passage formed between the frame bodies.
The specific structure of the formwork apparatus of the present invention will be explained in detail based on the illustrated embodiment.

〔Example〕

Fig. 1 is a side view of the formwork device of the present invention fixed to the rotation mechanism, Fig. 2 is a plan view showing an embodiment of the end plate used in the formwork device of the present invention, and Fig. 3 is the same as Fig. 2. FIG. 4 is a plan view showing an example of the outer frame; FIG. 5 is a side view of the outer frame shown in FIG. 4; FIG. 7 is a side view of the middle frame shown in FIG. 6, FIG. 8 is a plan view showing another embodiment of the formwork apparatus of the present invention, and FIG. 9 is a plan view showing an example of the middle frame. FIG. 2 is a perspective view showing an example of a concrete rectangular cylinder manufactured using the formwork apparatus of the present invention.

In the figure, 1 is a pair of left and right end plates with a relatively large through hole 2 bored in the center, and 3 is a rectangular cylindrical outer frame sandwiched between the pair of left and right end plates 1.1. The outer frame 3 of the embodiment shown in FIGS. 3 to 5 is a split type that is divided into two parts, and is provided on one side of the L-shaped split type. After aligning a certain through hole 4, fix both with bolts and nuts,
Although the outer frame 3 has a rectangular cylindrical shape, it may be made into an integrated rectangular cylindrical outer frame 3 instead of being divided, and the external shape may also be other than square. It may be a hexagon, a hexagon, etc., or in the case of a quadrangle, it may be a rectangular shape other than a rectangular shape.

In addition, several reinforcing rib pieces 5 are attached to the outer periphery of the outer frame 3, and the end plates 1. Several pins 7 are provided protrudingly to be fitted into the through holes or recesses 6 provided in the positioning holes 1.

Next, reference numeral 8 indicates an intermediate frame divided into at least two parts disposed within the outer frame 3, and in the embodiment shown in FIG. Each area is divided into four parts. In this embodiment, each middle frame body 8 is provided with a corner part 10 corresponding to each corner part 9 in the outer frame body 3, and both left and right end faces (upper and lower end faces in FIG. 7). , a bottle 1 to be fitted into a through hole or recess 11 for positioning provided in the end plates 1, 1.
There are some 2 protruding.

Then, the corner portions 10 of the middle frame body 8 are maintained at a predetermined distance from each corner portion 9 in the outer frame body 3, and the middle frame body 8
is assembled into the outer frame 3, but when the middle frame 8 is arranged near each corner 9 in the outer frame 3, there is a concrete material between the adjacent middle frames 8, 8. The required dimensions of the right-angled piece of the middle frame 8 are set in advance so that a passage 13 large enough to allow reverse flow is created. In the embodiment shown in FIG. 3, the surface opposite the corner lO of each of the four divided inner frame bodies 8 overlaps with the through hole 2 provided in the center of the end plates 1, 1. Although the notch is tapered to prevent this from happening, it is sufficient that this part does not overlap with the through hole 2 of the end plates 1 and 1 as described above, and as long as it is not tapered, as shown in Figure 8. It may also have a concave shape.

In order to manufacture a rectangular or rectangular concrete square cylinder, it is most preferable to divide the middle frame 8 into four parts at each corner 9 in the outer frame 3. As shown in the figure, it may be divided into two parts, and the point is that a passage 13 is formed between the middle frames 8 and 8 disposed inside the outer frame 3, and the passage 13 is large enough to allow concrete material to flow therethrough. Maintaining a predetermined distance from each corner 9 in the frame 3,
The inner frame 8 may be assembled into the outer frame 3 by dividing it into two parts or into four parts, as long as it is possible to assemble the inner frame body 8 into the outer frame body 3. Furthermore, when the outer frame body is made into a polygonal shape such as a hexagon, The inner frame may be divided into multiple parts according to the number of corner portions of the outer frame.

As a result of experiments conducted by the present inventor, it was found that in order to manufacture a rectangular cylinder with a rectangular cross section, a better product could be obtained by dividing the middle frame 8 into two parts as shown in FIG. did.

This middle frame body 8 also has a pair of left and right end plates 1 like the outer frame body 3.
, 1, and in order to make the clamping and fixing more reliable, through holes 15 for inserting long bolts 14 are bored in both left and right end surfaces of the middle frame body 8. Yes, pin 12
．． 12 into the through holes or recesses 11, 11 of the end plates 1, 1, and then pass the long bolts 14 through the through holes 15 through the end plates, so that the ends of the long bolts 14 protrude from the end plates. is tightened with a nut.

In addition, 16 in the figure is the outer frame 3 of the pair of left and right end plates 1, 1.
and several through holes drilled in locations outside the part where the middle frame body 8 is set, and after the above-mentioned outer frame body 3 and middle frame body 8 are arranged between the end plates 1.1, Long bolts 17, 17, etc. are inserted into the through holes 16, 16, and the ends are fixed with nuts. In addition, as mentioned above, in the embodiment shown in FIG.
In addition, the outer frame 3 and the middle frame 8 are firmly clamped and fixed between the end plates 1.1.

Further, I8 indicates an example of a rotating mechanism that applies cartwheel force to the above-mentioned formwork device, and this rotating mechanism 18 includes a machine frame 19, a pair of bearings 20 arranged oppositely in this machine frame 19, and this bearing 20. A rotating shaft 21 supported so as to be able to roll sideways, a pulley 22 fixed to one end of the rotating shaft 21, a rotating machine 23 fixed to the upper part of the machine frame 19, and a rotating machine 23 that can be rotated sideways. A pulley 25 fixed to the power shaft 24, a chain 26 suspended between the pulley 25 and the pulley 22, a rolling disc 27 connected and fixed to the other end of the rotating shaft 21, and this rotating disc 27. It consists of several locking arm members 28 for locking the formwork device protruding from the side, and formwork fixing means 29 provided at the tips of the locking arm members 28.

Next, the operation of the formwork apparatus of the present invention shown as an example will be explained.

First, the outer frame 3 and the middle frame 8 divided into two or more parts are assembled to one of the end plates 1. This work involves, for example, inserting and positioning the pins 12 and 12 protruding from the end surface of each of the inner frame bodies 8 into the through holes or recesses 11 provided in the end plate 1, and then Bin 7.7
... into the through holes or recesses 6, 6... C provided in the end plate L, and after completing the setting, the other end plate 1 is inserted into the outer frame 3 and the inner frame 8 by the same operation as above. Fit it onto the end face.

Next, the long bolt 14 is inserted from the through hole 30 provided in one end plate I into the through hole 15 formed in the end face of the middle frame 8, and the tip is inserted into the through hole 30 of the other end plate 1. protrude from
At the same time, a long bolt 17 is inserted through the through hole 16 of one end plate 1, and the tip part protrudes from the through hole 16 of the other end plate 1, and then fixed with a nut. Frame body 8
It goes without saying that in this state, a passage I3 is formed between the adjacent intermediate frames 8, 8 to the extent that the concrete material can flow therethrough, as described above.

The set formwork device is then fixed to a locking arm member 28 protruding from a rotating disk 27 constituting the rotating mechanism 18 using a formwork fixing means 29, as shown in FIG.

After this work is completed, the rotation machine 23 is driven to rotate the rotating disk 27.
While rotating, concrete 1 and materials are introduced into the formwork device through a relatively large-diameter through hole 2 provided at the center of the V of the end plate 1. As described above, since the middle frame body 8 is arranged so as not to overlap the through hole 2, the poured concrete material flows toward the outer frame body 3 due to centrifugal force, and the middle frame body 8, When the concrete material is strongly pressed against the inner wall of the outer frame 3 through the passage 13 formed between the 8 comrades, and evenly distributed in the space between the outer frame 3 and the inner frame 8. Stop adding concrete materials. In this state, the concrete square tube is rotated at high speed for a while, and after the rotation is stopped and the concrete material is hardened through a specified steam curing process, the formwork device is disassembled, and the inner circumferential surface also becomes square. It is something that can give you a body.

Although the illustrated example shows a relatively short formwork device, it is possible to use a formwork device with a length of 200 mm or more, for example, 3000 Iio1 to
When obtaining a long square concrete pipe of 5000m+o, cast iron tires were fitted at several points around a long formwork device (not shown), and the tires were fixed to the rotating shaft. It is best to rotate the formwork device while ensuring stability by making it slide against the wheels.In this case, a general centrifugal pipe making machine for making humid pipes, piles, etc. can be used. It is something.

Concrete square cylinder body 3 manufactured using the formwork device of the present invention
The outer circumferential surface of the l is precisely finished by centrifugal force, and the inner circumferential surface is also finished in a square shape as shown in Figure 9, making the wall thickness uniform and solid enough to meet the demands of various applications. It is a rectangular cylinder.

〔Effect of the invention〕

According to the formwork device for a centrifugal forming machine of the present invention, the middle frame body is divided into two or more as described above, and there is a passageway between adjacent middle frame bodies that is large enough to allow concrete material to flow. Since the concrete material is placed inside the outer frame in such a way that the concrete material is placed inside the outer frame, the concrete material introduced into the formwork device enters the space surrounded by the inner circumferential surface of the outer frame and the middle frame by centrifugal force without any hindrance. The centrifugal force presses it strongly against the inner circumferential surface of the outer frame, resulting in a fine, finely finished outer surface, and the inner circumferential surface has the same square shape as the outer surface, making the wall thickness uniform. It is possible to provide a concrete rectangular cylinder that can meet the demands of various applications.

[Brief explanation of the drawing]

Fig. 1 is a side view of the formwork device of the present invention fixed to the rotation mechanism, Fig. 2 is a plan view showing an embodiment of the end plate used in the formwork device of the present invention, and Fig. 3 is the same as Fig. 2. FIG. 4 is a plan view showing an example of the outer frame; FIG. 5 is a side view of the outer frame shown in FIG. 4; FIG. 7 is a side view of the middle frame shown in FIG. 6, FIG. 8 is a plan view showing another embodiment of the formwork apparatus of the present invention, and FIG. 9 is a plan view showing an example of the middle frame. FIG. 2 is a perspective view showing an example of a concrete rectangular cylinder manufactured using the formwork apparatus of the present invention. l: End plate 2: Through hole 3: Outer frame 4: Through hole 5: Rib piece 6: Through hole or recess 7: Bottle
8 Two middle frame body 9: Corner part ] 0: Corner part 11: Through hole or recessed part 12: Bin 13: Passage 14: Long bolt 15: Through hole
16: Through hole 17: Long bolt 18: Cartwheel mechanism patent applicant CF Industries Co., Ltd. Figure 2 Figure 3 Figure 4 A

Claims (1)

[Claims] This is a formwork device for a centrifugal forming machine in which a formwork placed between a pair of left and right end plates is moved by a moving mechanism, and the concrete material filled in the formwork is shaped by centrifugal force. The formwork is composed of an outer frame having a rectangular tube shape and an inner frame divided into at least two parts disposed inside the outer frame, and the middle frame is divided into two or more parts. The inner frame body is provided with a corner portion corresponding to a corner portion, and the inner frame body is disposed within the outer frame body such that the corner portion of the inner frame body maintains a predetermined distance from each corner portion within the outer frame body. At the same time, after installation, a passage is created between the adjacent middle frames so that the concrete material can flow, and the concrete material poured into the center of each middle frame is moved by centrifugal force. A formwork device for a centrifugal molding machine, characterized in that the formwork device for a centrifugal molding machine is configured to be able to enter a space surrounded by an outer frame body and a middle frame body through the passage formed between the middle frame bodies.