JPH0467709A - Piping method in conduit line - 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 utilizes a large-diameter pipe, for example, a gas pipe that has been discontinued, and includes at least one small-diameter pipe or multiple threads in the gas pipe. The present invention relates to a method of drawing a bundle of small diameter tubes, such as a bundle of tubes containing telephone cables.

[Conventional technology]

Conventionally, in order to draw such a large number of small-diameter pipe bundles into a large-diameter pipe, mortar was spread at the bottom of the large-diameter pipe to form a nearly flat floor, and the small-diameter pipe was placed on a nozzle holder with casters. The method used was to place a pipe bundle, pull the nozzle stand over the mortar floor, pipe the small diameter pipe bundle, and finally fill the pipe with mortar and fix it.

[Invention or problem to be solved]

However, with this conventional method, the floor surface must be carefully constructed to eliminate left and right inclinations with respect to the vertical direction of the mortar floor surface, and the level of the left and right sides of the floor surface must be equal. , the small-diameter pipe bundle becomes twisted, causing it to be pulled in to either the left or right side, and furthermore, the lead-in pipe comes into contact with the pipe wall of the large-diameter pipe, and friction prevents subsequent drawing. Therefore, it becomes almost impossible to pull in a long span.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for piping a small-diameter tube bundle into a large-diameter conduit simply and smoothly, without causing the small-diameter tube bundle to come into contact with the large-diameter conduit wall, and without twisting.

[Means to solve the problem]

To achieve this objective, the present invention provides a piping method in which at least one small-diameter pipe is drawn into a large-diameter pipe line.
attaching hanger rails to anchor bolts provided at intervals along the longitudinal apex portion of the conduit from one manhole to the other manhole, and attaching pulleys at intervals at the center of the apex of the small diameter pipe; Inserting the small diameter pipe from one end of the conduit in the one manhole, sequentially arranging the pulleys on the hanger rail, and performing suspension piping by sliding the pulley that suspends the small diameter pipe along the hanger rail. It is characterized by

[For production]

According to the method of the present invention, the small-diameter pipe suspended by a pulley from the hanger rail along the vertical vertex of the pipe is automatically smoothed by gravity while maintaining a predetermined distance from the pipe wall along the central vertical plane of the pipe. Move to.

〔Example〕

Next, preferred embodiments of the present invention will be described with reference to the drawings.

According to the piping method of the present invention, a large-diameter pipe buried underground, such as a disused gas pipe, has an inner diameter of 950 mm.
InI11. Using an existing pipe 1 with a wall thickness of 80 mm, taps are made radially outward from the inside of the pipe at predetermined intervals along the vertical vertex of the existing pipe 1, and anchor bolts 2 are used to tighten the pipe. The hanger rail 3 extending in the vertical direction is fixed (see Figure 1), and a large number of small-diameter tubes 4 are bundled at approximately predetermined intervals, for example, cable accommodation tubes having an inner diameter of 75 mm to accommodate a large number of telephone cables. A pulley 6 is attached to the center of the top of the bundling member 5, and by inserting the rollers 6a of these pulleys 6 into the hanger rail 3, the small diameter pipe bundle 7 is suspended from the ceiling of the existing pipe 1, and the pulley 6 slides along the hanger rail 3. The small diameter tube bundle 7 is piped over the span of the existing pipe 1.

A large number of small diameter pipes 4 are bound by connecting two U-shaped binding hands as a binding member 5 with bolts (not shown), and an ankle 8 is attached to the upper surface of the upper binding band. The support port 6b of the pulley 6 is inserted into the flange portion 8a of the angle 8, and fixed by vertically positioning the small diameter tube bundle 7 so as not to contact the wall of the existing tube 1 with a nut 9.

The small diameter pipe bundle 7 is introduced into the pipeline through a manhole (not shown) at one end of the existing pipe 1, the rollers 6a of successive pulleys are inserted into the hanger rail 3, and the small diameter pipe bundle 7 is introduced from the manhole at the other end into the pipeline. By pulling the tube bundle 7, it is inserted into the existing tube 1.

After the insertion of the small diameter tube bundle 7 into the existing pipe is completed, the existing pipe is filled with a filler such as mortar to fix the small diameter tube bundle 7 so that it does not move.

FIG. 2 shows a perspective view of the hanger rail 3, and the pulleys 6 inserted into the hanger rail 3 are, for example, 3a and 3.
It is preferable to use a pulley with a double roller pair as shown in Figure b.

In the above-mentioned embodiment, the lead-in piping of a large-diameter pipe with a large number of small-diameter tube bundles was explained, but the present invention is also applicable to the lead-in piping of a single small-diameter pipe with a diameter smaller than the existing pipe. Of course, you can do it.

〔Effect of the invention〕

According to the present invention, since a new service pipe is suspended from the ceiling of the existing pipe and pulled in by a pulley without the need to form a floor surface at the bottom of the large-diameter existing pipe, it is possible to easily attach the inside of the pipe to the outside pipe wall. Insertion piping can be carried out smoothly without contacting the inner or outer tubes, and without damaging the outer or inner tubes.

[Brief explanation of the drawing]

FIG. 1 is a diagrammatic cross-sectional view, which is a partial side view, showing a state in which a large-diameter existing pipe is suspended from a large-diameter bundle of small-diameter pipes by a pulley. FIG. 2 is a perspective view of the hanger rail, and FIGS. 3a and 3b are a side view and an end view of the pulley, respectively. 1... Existing pipe (large diameter pipe) 2... Anchor holder 3... Sliding rail 4... Small diameter pipe 5... Binding member (tie band) 6... Pulley 6a... Loaf 6b...
・Support port 7...Small diameter tube bundle...Angle 8a...Flange part 9...Nut Figure 3 (a) (b)

Claims (1)

[Claims] 1. In a piping method in which at least one small-diameter pipe is drawn into a large-diameter pipe, anchor bolts are provided at intervals along the vertical apex of the pipe from one manhole to the other. Attach a hanger rail, install pulleys in sequence at intervals at the center of the top of the small diameter pipe, insert the small diameter pipe from one end of the conduit in the one manhole, and sequentially attach the pulleys to the hanger rail. A method for piping in a conduit, characterized in that suspension piping is performed by sliding a pulley along a hanger rail that suspends the small diameter pipe.