JPH0929729A - Production of concrete pipe having inclined end surface and form used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mass-produce a concrete pipe of which the inclined end surface is well finished by tightly clamping an upper palette to the upper end of an outer mold to hold the upper end of the concrete pipe to reverse the same before demolding the concrete pipe. SOLUTION: A lower palette 3 and an outer mold 2 are fitted to the outside of the inner mold 1 fixed to a base plate 7 and the support part of the lower palette 3 is supported on the vibration ring 10 provided to the inner mold 1 and the lower end of the outer mold 2 is placed on the outer periphery of the lower palette 3 to tightly clamp the outer mold 2 and the palette 3. Next, firmly kneaded concrete 27 is charged in the molding space formed by the outer mold 2, the inner mold 1 and the lower palette of which the upper surface is inclined and vibration is applied to the concrete by a vibrator 27 while the upper surface of the concrete is pressed by a pressure plate 26 to tightly compact the concrete. Next, an upper palette is superposed on the upper surface of the concrete 27 to be tightly clamped to the outer mold 2 and the outer mold 2 is hung up to demold a product from the inner mold 1 upwardly along with the lower palette 3 and the product is reversed up and down in the hung-up state to be allowed to fall on a flat surface to remove the outer mold and the lower palette.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a manufacturing method in which hard kneaded concrete having a low water / cement ratio is put into a mold, and the mold is vibrated to be compacted, and then immediately removed from the mold, whereby one end surface is The present invention relates to a method for manufacturing a concrete pipe having a slanted circular cross section, a culvert having a rectangular cross section, a manhole side block, and a formwork used in the manufacturing method.

[0002]

2. Description of the Related Art When a concrete pipe whose one end surface is inclined is manufactured by a manufacturing method by instant demolding, a vibrating ring is provided around a lower part of a middle size in which a vibrating machine is installed, and the vibrating ring is provided with an inner circumference. A mold frame is used in which an outer mold is placed on the outer periphery of a supported ring-shaped pallet, and the outer mold and the pallet are tightened by a fastener provided on the outer mold.

The middle mold of this mold is erected on the base plate, and the concrete with a low water / cement ratio is poured into the molding space between the middle mold and the outer mold fitted to the outside of the middle mold. After applying a vibration from a vibrating machine to tighten and harden the concrete, finish it while pressing the top surface of the concrete with a pressure plate to form a normal concrete pipe, and after demolding, make diagonal cuts on the surface of the molded product, and the next day. Based on the cut, a method of crushing and removing an unnecessary portion of concrete which is not yet sufficiently hardened, or a method of cutting a completely hardened normal concrete pipe at a predetermined angle using a cutter or the like has been adopted.

[0004]

With such a conventional manufacturing method, it is not possible to obtain a smooth finished end surface, and in the case of cutting an ordinary concrete pipe after hardening diagonally, a large weight is required. Since the concrete pipes have to be moved and rolled, and the rebars that have been inserted have to be cut, there is a drawback in that much labor is required. Moreover, with such a conventional method, it is impossible to form the concavo-convex for joining, that is, the spigot, on the inclined end surface.

The present invention solves the problems of the conventional manufacturing method as described above, and intends to mass-produce a concrete pipe having an inclined end surface and having a good end surface finish.

[0006]

The method for producing a concrete pipe having a slanted end face according to the present invention is a method of pouring hard-mixed concrete into a molding space formed by an outer mold, a middle mold, and a lower pallet whose upper surface is slanted. After applying a vibration to this by a conventional method to tighten and harden it, stack a pallet on the top surface of concrete and tighten it to the outer mold, lift the outer mold and remove the product from the middle mold to the upper mold together with the bottom mold. In the state that it was lifted, flip it upside down and lower it on a flat surface,
It is a manufacturing method of removing the outer mold and the bottom mold.

The formwork used in the method for manufacturing the concrete pipe is a middle form having a vibrating machine inside and a vibrating ring on the lower circumference, and tightening devices at the upper and lower ends of the outer side. An outer mold with a connecting part for lifting at the upper end and a connecting shaft for lifting at the middle part of the outer surface, and an outer periphery clamped to the lower end of the outer mold, the inner periphery being supported by a vibrating ring, and the inclined upper surface. Is formed by a lower pallet that obliquely cuts off the lower part of the molding space formed by the middle mold and the outer mold, and an upper pallet that is fastened to the upper end of the outer mold and seals the upper end of the molding space.

It is preferable that the lower pallet is detachably bolted to the underframe and the frame body whose upper surface is inclined.

According to the manufacturing method and the mold of the present invention, the bottom of the molding space is blocked by the lower pallet whose upper surface is inclined, and the kneading concrete is put into this molding space to be tightened and hardened, and then the upper end thereof. It is easy to manufacture concrete pipes with sloped end faces because the outer pallet is turned off so that the lower pallet is on the top and the concrete is on the bottom after the mold is cut off with the upper pallet and the middle pallet is removed. Can be done.

By connecting the lifting device to the connecting portion provided at the upper end of the outer mold, the outer mold having the concrete pipe and the lower pallet therein can be easily lifted in a stable state. Further, the lifting device is connected to the connecting shaft in the middle part and lifted up, and the outer mold in a suspended state can be easily inverted around the connecting shaft.

The lower pallet is composed of an underframe and a frame body whose upper surface is inclined, and when it is detachably bolted, it is replaced with a frame body having a different inclination angle or a frame body having a different height. This makes it possible to easily manufacture concrete pipes whose end faces have different angles and lengths.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the figure, A is a middle mold 1 and an outer mold 2
And the lower pallet 3 and the upper pallet 4 are metal molds.

As shown in FIG. 1, the middle mold 1 is mounted on a base plate 7 in a vertical hole 6 formed underground by a concrete layer 5 and internally has a vibrator 9 driven by a motor 8. . Further, a metal vibrating ring 10 is provided on the outer periphery of the lower end.
Is protruding.

The outer mold 2 is fitted on the outside of the middle mold 1 at a predetermined interval, and is removably fixed to the outer periphery of the lower pallet 3 by a fastener 11 that is provided at the lower end of the outer mold 2 at a predetermined interval, and at the upper end thereof. The upper pallet 4 is secured by the fasteners 12 provided at intervals.
Is removably tightened. Further, connecting parts 14 of a bifurcated hoisting device 13 connected to a crane or the like are projectingly provided on the left and right of the upper end outer surface of the outer mold 2, and the hoisting device is provided on the outer surface of the middle part, that is, on the left and right of the outer surface near the center of gravity. 13 connecting shafts 15 are provided in a protruding manner.

As shown in FIG. 7, the lower pallet 3 has an upper surface 17 inclined on the underframe 3a provided with a supporting portion 16 for the vibrating ring 10 on the inner periphery and a recess 1 for spigot on the inner periphery.
The lower end of the frame body 3b forming 8 is detachably connected by a fastening bolt 19. The inner space of the lower pallet 3 is supported on the vibrating ring 10, and the outer circumference is fastened to the lower end of the outer mold 2 by the fastener 11 to form the molding space 20 formed between the middle mold 1 and the outer mold 2. The bottom of the is cut off diagonally.

As shown in FIG. 8, the fastening member 11 has an upper end of a connecting rod 23 axially attached to an intermediate portion of a lever 22 whose lower end is rotatably supported by a bearing 21 provided outside the lower part of the outer mold 2. Then, the lower end thereof is pivotally attached to the middle portion of the fastening plate 25 whose base end is axially supported by the bearing 24 outside the lower end of the outer die. Therefore, when the lever 22 is pushed up as shown by the solid line in FIG. 8, the tip of the fastening plate 25 is rotated upward and the lower pallet 3 is crimped to the lower end of the outer mold 2, and from this fastening state, When the lever 22 is pushed down as shown by the chain line, the front end of the fastening plate 25 rotates downward, and the fastening between the lower end of the outer die and the lower pallet 3 is released. The fastener 12 has the same structure as the fastener 11, and is fixed upside down.

The upper pallet 4 is formed so as to conform to the shape of the upper end of the molded concrete, and is placed on the upper end of the concrete at the time of demolding and provided at the upper end of the outer mold 2 at intervals. The fastener 12 is detachably fastened to the outer mold 2.

A reference numeral 26 indicates a hardened concrete 2 which is sealed in the upper end of the molding space 20 and is put into the molding space 20.
7 is a pressing plate for pressing the upper surface of 7 to form a predetermined shape.

The pressurizing plate 26 is suspended from a piston rod 30 of a hydraulic cylinder 29 fixed to an arch-shaped frame 28 on the vertical hole 6 via a vibration isolator 31. One end of the frame 28 is pivotally attached to one of the openings of the vertical hole 6 so as to be horizontally rotatable, and the other end of the frame 28 is detachably connected to the other of the openings of the vertical hole 6.

Since the formwork used in the method for producing a concrete pipe according to the present invention has the above-mentioned structure, as shown in FIG. 1, the lower pallet is placed outside the middle mold 1 fixed on the base plate 7. 3 and the outer die 2 are fitted together, the supporting portion 16 of the lower pallet 3 is supported by the vibration ring 10 provided in the middle die 1, and the lower end of the outer die 2 is placed on the outer periphery of the lower pallet 3 and fastened. Metal fittings 1
Tighten both by 1.

A reinforcing bar (not shown) is inserted into the molding space 20 formed between the middle mold 1 and the outer mold 2, and the hard concrete 27 having a water / cement ratio of 38% to 47% is gradually added. Meanwhile, the vibrator 9 is driven to apply vibration to the form A and the hard concrete 27, and when the hard concrete 27 reaches the upper end of the molding space 20, the pressing plate 26 is provided on the upper surface thereof.
And press down to mold the upper surface.

After the completion of the compaction and hardening of the hardened concrete 27, the pressurizing plate 26 is raised and the frame 28 is horizontally rotated to retract the pressurizing plate 26 from the position of the vertical hole 6 to the side. The upper pallet 4 is piled up on 27 and fastened to the outer mold 2 with the fasteners 12. Then, as shown in FIG. 2, the two forked ends of the lifting device 13 are locked to the connecting portions 14 projecting from the upper end of the outer mold 2, and the outer mold 2 is lifted, whereby the lower pallet 3 and the concrete product B are separated. At the same time, it is lifted and released from the middle mold 1.

As shown in FIG. 3, the outer mold 2 thus pulled up is once lowered onto a flat surface 32, and both ends of the lifting device 13 are transferred from the connecting portion 14 at the upper end to the connecting shaft 15 at the intermediate portion and lifted again. As shown in FIG. 4, the outer mold 2 is turned upside down.

The inverted outer mold 2 is lowered onto the flat surface 32 as shown in FIG. 5, the fastener 12 is removed, and the lower pallet 4 and the outer mold 2 are disconnected from each other. Type 2
, The outer mold 2 and the lower pallet 3 are removed at the same time, and a concrete product B having an inclined surface at one end is obtained. If this concrete product B held on the upper pallet 5 is allowed to stand as it is, hardening proceeds and it becomes a finished product.

In the above-described embodiment, a square tube-shaped concrete pipe, that is, a culvert pipe is manufactured by using the form A having a rectangular cross section. However, in the case of manufacturing a cylindrical pipe or a manhole-side mass. It goes without saying that a form A having a circular cross section is used.

Further, when manufacturing products having different inclination angles of the connection ends or mass-producing products having different lengths, the frame bodies 19 having different inclination angles of the upper surface 18,
Alternatively, it may be changed to a frame body 19 having a different height.

[0027]

According to the manufacturing method and mold of the present invention, after the upper pallet is clamped to the upper end of the outer mold to hold the upper end of the concrete pipe, the lower pallet is on the upper side and the upper pallet is on the lower side. Since the outer mold is inverted and then demolded, the concrete pipe is supported on the upper pallet and can be easily demolded without damaging the inclined upper end.

The inclined end surface of the concrete pipe is
The upper surface of the lower pallet can be smoothly molded, and the upper surface of the lower pallet can be molded into an end surface having an arbitrary shape.

Since a connecting portion for hoisting is provided on the upper end of the outer die and a connecting shaft for reversing is provided in the middle portion, stable hoisting,
And the inversion can be easily performed.

When the lower pallet has the underframe and the frame body detachably connected to each other, the upper pallet can be replaced with a frame body having a different inclination angle and height. It is possible to mass-produce concrete pipes with different end face inclination angles and lengths.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a molding process using a mold of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which an upper pallet is fastened to the outer mold.

FIG. 3 is a vertical cross-sectional view showing a released state from the middle die.

FIG. 4 is a side view showing a state in which an outer die is lowered onto a flat surface.

FIG. 5 is a side view showing an inverted state of the outer die.

FIG. 6 is a side view showing a demolded state of the outer mold.

FIG. 7 is a perspective view of a lower pallet.

FIG. 8 is a vertical sectional view showing a main part in FIG.

[Explanation of symbols]

 A form B B concrete pipe 1 medium size 2 outer form 3 lower pallet 3a stand frame 3b frame body 4 upper pallet 10 vibrating ring 11 fastening metal fitting 12 fastening metal fitting 13 suspension device 14 upper end connecting portion 15 middle connecting shaft 17 Sloped upper surface 19 Fastening bolt 20 Forming space 27 Hard mixed concrete

Claims (3)

[Claims] 1. A concrete kneading machine is put into a molding space formed by an outer mold, a middle mold, and a lower pallet whose upper surface is inclined. Stack the upper pallet on the upper surface and tighten it with the outer mold, lift the outer mold to remove the product from the middle mold together with the bottom mold, and flip it upside down in the lifted state and lower it on a flat surface. A method for manufacturing a concrete pipe having an inclined end surface, characterized in that an outer mold and a lower pallet are removed from the mold upward. 2. A medium-sized machine having a vibrating machine inside and a vibrating ring provided on the outer circumference of the lower part, tightening devices at the upper and lower ends of the outer surface, and a hoisting connecting part at the upper end of the outer surface, A molding space formed by a middle mold and an outer mold with an outer mold having a connecting shaft for lifting in the middle, and an outer circumference clamped to the lower end of the outer mold, an inner circumference supported by a vibration ring, and an inclined upper surface. Used in a method for producing a concrete pipe having an end face, characterized by comprising a lower pallet whose lower part is obliquely cut off, and an upper pallet which is tightened to the upper end of the outer mold and hermetically seals the upper end of the molding space. Formwork. 3. A formwork used in the method for manufacturing a concrete pipe having an end face according to claim 2, wherein the lower pallet is detachably bolted to the underframe and the frame body whose upper surface is inclined.