JPH0249884B2 - KONKURIITOENTOKANNOSEIKEIHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for forming a concrete cylindrical pipe, and more particularly to a forming method for finishing the inner surface of a concrete pipe formed in a form.

<Conventional technology> In general, cylindrical concrete pipes are formed by using a concrete dosing machine to pour a certain amount of concrete into a horizontally supported formwork that can be rotated freely, and by applying rotation to this formwork, concrete is poured by centrifugal force. It is compacted to form a cylindrical tube on the inner surface of the formwork.

By the way, when forming a concrete cylindrical pipe using centrifugal force, the outer surface is finished with good precision by forming with a formwork, but the inner surface cannot be precisely finished if it is still formed by centrifugal force, so an inner finishing process is necessary. become.

<Problems to be solved by the invention> The conventional internal surface finishing method involves, for example, inserting a long roller into the formwork after pouring concrete, and rotating the formwork with both ends of the roller artificially supported. Since this was done by leveling the inner surface, the inner surface finishing process was completely independent of the concrete pouring and forming processes, which was a factor that significantly reduced the forming efficiency, so automation of the inner surface forming was desired. is the current situation.

This invention has been made in view of the above points, and an object of the present invention is to provide a concrete cylindrical pipe forming method in which the inner surface of the concrete cylindrical pipe can be formed continuously and automatically following the concrete pouring process. With the goal.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a concrete pouring machine that can freely advance and retreat with respect to a formwork for forming cylindrical pipes and that pours concrete into the formwork. The internal finishing head is connected, and when the feeding machine retreats, the internal finishing head is pulled and pulled into the formwork.
The head that moves within the formwork finishes the inner surface of the concrete inside the formwork.

<Operation> A concrete feeding machine is brought close to the formwork which is arranged so as to be able to rotate freely in a fixed position, and a certain amount of concrete is poured into the formwork by the concrete discharge tube of this feeding machine, and the concrete is penetrated through the formwork. Connect the inner finishing head to the tip of the discharge tube.

The formwork is rotated to centrifugally form a cylindrical tube.During the final rotation, the concrete feeder is retracted, and the internal forming head connected to the discharge tube is pulled into the formwork.The head moves axially through the formwork. This is to finish the inner peripheral surface of the cylindrical tube into a smooth surface.

<Embodiments> Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

As shown in the figure, a formwork 2 for centrifugally forming a concrete cylindrical pipe 1 has tires 3 provided on its outer surface.
is supported by a molding machine 4, and during molding, it is rotated around a horizontal axis and given vibration as necessary, and the concrete poured inside is molded by centrifugal force, and the thickness is reduced by the end plate 5. It is adapted to form a defined concrete cylindrical tube 1.

Feeding machine 6 that feeds concrete into the formwork 2 above
These include a truck 7 that can move forward and backward along the axial direction of the formwork 2 supported by the molding machine 4, a hopper 8 placed on the truck 7, and a horizontal discharge pipe 9 attached to the bottom of the hopper 8. And the screw 1 of this discharge tube 9
Drive 0.

The discharge tube 9 is formed by the motor 11, and
By moving the trolley 7, it can be freely inserted into and removed from the formwork 2 on the molding machine 4, and the inserted part is attached to the formwork 2.
It is slightly longer than the total length of the.

The charging machine 6 sends the concrete charged into a hopper 8 forward with a screw 10 of a discharge tube 9, and discharges the concrete from the tip of the discharge tube 9 into the formwork 2.

Concrete cylindrical pipe 1 formed in the formwork 2
The inner finishing head 12 is connected via a rod 13 to the tip of the discharge tube 9 in the feeding machine 6, is pulled into the formwork 2 when the discharge tube 9 is pulled out, and is rotated around the inside of the formwork 2 which is given finishing rotation. The inner peripheral surface of the cylindrical tube 1 is finished into a smooth surface with a constant diameter by moving and passing in the same direction.

The structure of the internal finishing head 12 is not limited in any way as long as it can finish the internal surface of the cylindrical tube 1 by moving in the axial direction within the rotating formwork 2, but its specific structure is shown in FIG. An example is shown.

In FIG. 2, the internal finishing head 12 consists of a disc 17 with a groove 14 removably attached to the tip of a rod 13 by a mounting mechanism 16 using a pin 15, and a semi-finishing head provided on the outer periphery of the disc 17. an annular wall 18;
Arc-shaped arm 19 for rough finishing protruding from the front of the annular wall
and a plurality of finishing rolls 20 pivotally fixed to the rear outer periphery of a disc 17, and by moving in the axial direction within the formwork 2, the protrusion created on the inner surface of the cylindrical tube 1 at the tip of the arcuate arm 19 is first removed. The inner surface of the cylindrical tube 1 is finished by rough finishing by scraping off parts, etc., and then the inner surface of the cylindrical tube 1 is finished using an annular wall 18 and a finishing roll 20.

Note that a plurality of inner finishing heads 12 with different diameters are prepared, and the one suitable for the cylindrical tube to be formed is selected and used.Although not shown, the inner finishing head 12 is used to attach arcuate walls, finishing rolls, etc. to the screws of the discharge tube 9. Alternatively, a motor attached to a mold or rod may be used as a drive source to forcibly rotate in the opposite direction to the formwork 2, thereby improving the accuracy and efficiency of the inner surface finishing.

The finishing method of the present invention is carried out using a formwork 2, a charging machine 6, and an internal finishing head 12. When the concrete charging machine 6 charges a certain amount of concrete into the formwork 2, the discharge tube 9 releases the mold. It stands by so as to penetrate inside the frame 2, and in this state, the inner surface finishing head 12 is attached to the tip of the discharge tube 9 via the rod 3.

Rotation and vibration are applied to the formwork 2 supported by the forming machine 4 to form the concrete inside into the cylindrical tube 1. When the rotation of the formwork 2 shifts to finishing rotation, the feeding machine 6
is retracted, and the finishing head 12 is drawn into the formwork 2 and passed from one end to the other end.

The finishing head 12 moves in the axial direction within the rotating mold frame to finish the entire length of the inner circumferential surface of the cylindrical tube 1 into a highly accurate and smooth surface.

<Effects> As described above, according to the present invention, the inner finishing head of the concrete charging machine is attached and the finishing head is drawn into the formwork by retracting the concrete casting machine with respect to the formwork. The inner surface of the cylindrical tube can be formed automatically using a feeding machine, improving the efficiency and saving labor of the inner surface finishing work.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the molding method according to the present invention, and FIG. 2 is an enlarged sectional view of the main part of the same. 1... Cylindrical tube, 2... Formwork, 4... Molding machine, 6...
...Insertion machine, 9...Exhaust pipe, 10...Screw,
12...Inner finishing head,...rod.

Claims (1)

[Claims] 1. An internal finishing head is connected to a concrete feeding machine that can freely move forward and backward relative to a formwork for forming cylindrical pipes and feeds concrete into the formwork, and when the feeding machine retreats, the internal finishing head is pulled to fill the concrete inside the formwork. A method for forming a concrete cylindrical tube, characterized by finishing the inner surface of the concrete inside the formwork with a head that moves the formwork.