JPS6042013A - Method of coating pipe body with mortars - 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] A pipe body whose outer periphery is coated with mortar or mortar such as concrete has been used for circular pipes such as humid pipes and steel pipes. The outer shell coating method is generally carried out by spraying with a mortar gun, but this method not only inevitably causes unevenness on the outer surface and uneven wall thickness, but also causes a lot of material loss. The drawbacks are that it is time-consuming and costly.

The present invention aims to eliminate the above-mentioned conventional drawbacks.
By placing a pipe body such as a circular pipe in the upper half-shaped formwork and press-fitting mortar into the gap between the formwork and the pipe body, it is possible to easily cover the outer shell of the pipe body with mortar. The aim is to improve accuracy, improve quality and reduce costs.

Embodiments of the present invention will be described below with reference to one drawing.

1 is an upper half-shaped formwork used in the method of the present invention;
Two arcuate upper molds 6 and 3 are attached to the upper end of the lower mold 2, which has an approximately semicircular cross section, by means of pins 4.4 so as to be openable and closable. It is designed to be opened and closed as shown by the arrows in Figure 2. The inner diameter of the formwork 1 is twice as large as the thickness t of the coating and the outer diameter d of the tubular body 6, such as a circular tube, which is coated with one mortar. In addition, a plurality of injection holes Z7 are provided at the bottom of the lower mold 2, and a hose 8 having an openable pulp 9 is communicated with the injection hole Z7, and the hose 8 is injected with mortar through a pump (not shown). connected to other sources.

The method of the present invention is carried out using the above-mentioned formwork 1, and first, the formwork 1 is connected to the upper molds 3, 3 by hydraulic cylinders 5, 5.
shorten and open outward. Then, the tube body 6 that requires covering with mortar is placed in the formwork 1, and the thickness K is the same as the thickness t of the mortar coated on the tube body 10 at both ends of the tube body 6. After fitting an elastic ring 10 made of rubber or the like formed to a thickness of It is brought into close contact with the elastic ring 10. As a result, a gap 11 (with the same thickness as the elastic ring 10) is formed between the outer surface of the open tube body 6 of the elastic rings 10.10 at both ends and the inner surface of the formwork 1.
Figure 1) will be formed.

In this state, connect the pump to the water source and open knob 9.
Water is injected into the formwork 1 through the hose 8 and the injection hole 7,
The outer surface of the tube 6 is moistened. This is done to increase the adhesion of mortar to the pipe body 6. Note that this water injection is not limited to injection via a pump.
For example, it is also possible to fill the gap 12 formed between the upper edges of the pair of upper molds 6 and 3 as appropriate, and in addition to the mortar injection hole 7, a water injection hole (not shown) may be provided. It is also possible to provide a hole and inject water through the hole. Once the pipe body 10 has been sufficiently moistened, the injected water is removed.

Next, the pump connected to the supply source of mortar 13 is activated, and the mortar 13 (
(Fig. 3) is press-fitted. As a result, the gap 11 between the pipe body 6 and the formwork 1 is filled with mortar 14.

When the mortar 16 fills the upper half of the formwork 1,
Close the valve 9 to stop pouring the mortar 13, and remove the upper mold 6.
, 6 Smooth out the mortar in the gap 12 between the edges with a trowel. and.

When the injected mortar 16 has sufficiently hardened, the hydraulic cylinder 5.5 is shortened, the upper molds 6, 6 are opened, and the tube body 6 covered with the mortar 13 is taken out and fitted onto both ends. After removing the elastic parts 3Ji10, 10, the outer surface of the tube body 6 is coated with mortar by conventional means such as spraying or hand painting.

As explained above, one aspect of the present invention is that a coated sliding pipe body is placed in a formwork 1 having a larger diameter, and mortar is press-fitted into the gap between the pipe body and the formwork. , the coating of mortar on the tube body is done with high accuracy with no unevenness and uniform wall thickness, 1 quality is significantly improved, the coating work is extremely simple, there is almost no loss of material, and costs are reduced. It has many excellent effects, such as being able to significantly reduce the

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal side view showing an embodiment of the formwork device used in the method of the present invention, FIG. 2 is a front view of the same, and FIG. FIG. 1... Formwork, 2... Lower mold, 3... Upper mold, 5...
Hydraulic cylinder, 6... Pipe body, 7... Injection hole, 8...
・Hose, 10...Elastic ring, 16...Mortar

Claims (1)

[Scope of Claims] A circular pipe or the like is placed in an upper half-shaped formwork consisting of a lower mold such as a semicircle and an upper mold which is divided into a plurality of pieces and attached to the lower mold so as to be openable and closable. The method is characterized in that the tubular body is left standing with a gap between it and the inner surface of the mold, and mortar is press-fitted from the lower die b) of the mold to form a covering layer of mortar on the tubular body. Method for covering pipes with mortar.