JPS6227115A - Method of molding concrete cylindrical pipe - 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 <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 high precision by forming with a formwork, but
If the inner surface remains centrifugally formed, precision cannot be achieved, so an inner finishing process is required.

<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 process and the forming process, which caused a significant drop in forming efficiency.Therefore, automation of the inner surface forming is desired. This 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 inner finishing head is connected, and when the feeding machine retreats, the inner finishing head is pulled into the formwork, and the head moving within the formwork finishes the inner surface of the concrete inside the formwork.

Action〉 A concrete feeder is brought close to the formwork, which is arranged so that it can rotate freely in a fixed position, and a certain amount of concrete is poured into the formwork with the concrete discharge tube of this feeder, 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 withdrawn, and the inner forming head connected to the discharge cylinder is pulled into the formwork, and the head moves axially through the formwork to form the cylinder. This is to finish the inner circumferential surface of the 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 a tire 3 provided on its outer surface supported by a forming machine 4, and rotates around a horizontal axis during forming. Vibrations are applied to the tube, and the concrete placed inside is shaped by centrifugal force, forming a concrete cylindrical tube 1 whose thickness is defined by the end plate 5.

The charging armor 6 for charging the concrete 1 into the formwork 2 includes a cart 7 that can move forward and backward along the axial direction of the formwork 2 supported by the molding machine 4, and a hopper placed on the cart 7. 8 and
A horizontal discharge tube 9 attached to the lower part of the hopper 8 and a screw 10 of this discharge tube 9 are driven.

The discharge tube 9 is formed by the motor 11, and can be placed in a position that can be handled differently with respect to the formwork 2 on the molding machine 4 by the movement of the cart 7, and the insertion part is slightly longer than the total length of the formwork 2. ing.

The feeding machine 6 sends the concrete charged into the hopper 8 forward by the screw 10 of the discharge tube 9, and
into the formwork 2 discharged from the tip.

The inner surface finishing head 12 of the concrete cylindrical pipe 1 formed in the formwork 2 is connected via a rod 13 to the tip of the discharge tube 9 in the charging machine 6, and when the discharge tube 9 is handled, the head 12
The inner circumferential surface of the cylindrical tube 1 is finished into a smooth surface with a constant diameter by moving in the axial direction and passing through the formwork 2 which is drawn in and subjected to finishing rotation.

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

In FIG. 2, the internal finishing head 12 includes 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. It is composed of an annular wall 18, an arcuate arm 19 for finishing the edges protruding from the front surface of the annular wall, and a plurality of finishing rolls 20 carried on the rear outer periphery of the disk 17. By moving the cylindrical tube 1 at the tip of the arcuate arm 19,
The inner surface of the cylindrical tube 1 is roughly finished by scraping off any protruding 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 one is selected according to the cylindrical tube to be formed, and although not shown, the arcuate walls, finishing rolls, etc. are Alternatively, a motor attached to a rod may be used as a drive source to forcibly rotate the formwork 2 in the opposite direction to improve the accuracy and efficiency of the inner surface finishing.

The finishing method of the present invention is carried out using the formwork 2, charging@6, and internal finishing head 12, and when the concrete charging machine 6 charges a certain amount of concrete into the formwork 2, the discharge tube 9 releases the mold. The inner finishing head 12 is attached to the tip of the discharge tube 9 via the rod 13 in a standby state so as to penetrate through the inside of the frame 2.

The formwork 2 supported by forming a4 is rotated and moved to form the concrete inside into the cylindrical tube 1, and when the rotation of the formwork 2 shifts to finishing rotation, the feeding machine 6 is turned off, 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 surface finishing head is attached to the concrete charging machine, and the finishing head is retracted into the formwork when the concrete charging machine leaves the formwork. The inner surface of a cylindrical tube can be formed automatically using a feeding machine, improving efficiency and saving labor in the inner surface finishing process.

[Brief explanation of the drawing]

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.

Claims (1)

[Claims] The inner finishing head is connected to a concrete feeder that can freely move forward and backward relative to the formwork for forming cylindrical pipes and feed concrete into the formwork, and when the feeder moves back, the inner finishing head is pulled to feed concrete into 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 through the formwork.