JPH0110537Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a connection structure for propulsion pipes that are connected and laid underground by a small diameter (approximately 150 to 350 mmφ) propulsion method, which is often used in sewerage construction.

Conventionally, propulsion pipes used for sewerage pipes have a length of 2 m.
Huum pipes of fixed length were used, but in this type of hium pipes, (a) the surface roughness of the inner hole surface is poor, resulting in poor hydraulic performance, and the pipes must be large in size to be used for sewer pipes. (b) that it must be sloped;
The pipe is heavy and difficult to handle;
(c) Due to the long standard size (2 m), there were drawbacks such as a large excavation area for the shaft for installing the propulsion equipment, resulting in high excavation costs.

The present invention was made to solve the above-mentioned problems, and the purpose of the present invention is to create a propulsion pipe that is easy to handle and has excellent hydraulic properties and construction workability. The purpose is to provide a connection structure.

As a means to achieve this object, the present invention provides a propulsion pipe connection structure in which a plurality of propulsion pipes are connected and laid underground by a propulsion construction method, in which each of the propulsion pipes is made of synthetic resin, and On the end surface of the front end, there is a fitting convex portion having an inner circumferential surface that is continuous with the inner hole of the tube and an outer circumferential surface that is one step smaller in diameter than the outer diameter of the tube.
At the same time, a fitting recess shaped to fit externally into the fitting protrusion is formed on the inner circumferential surface of the rear end of the tube, and a fitting recess shaped to fit outwardly into the fitting protrusion is further formed in the front and rear positions of the outer circumferential surface of the fitting protrusion. Rubber rings are fitted into the two annular grooves formed parallel to each other, and the outer and inner wall surfaces of the propulsion tubes connected to each other are smooth and continuous with the same diameter, including the connection part. It is characterized by being said to have a unique aspect.

The present invention will be explained below based on the illustrated embodiments.

First embodiment (see Figures 1 and 2) The tube body 2 of the propulsion tube 1 is a hard vinyl chloride resin tube,
It is made of synthetic resin pipes such as ABS resin pipes, and the pipe thickness t is thicker than the pipe thickness of conventional ordinary PVC pipes (0.05 times the outer diameter dimension), that is, 0.06 times the outer diameter D or more. In addition, its effective length Z is shorter than the standard length (2 m) of a conventional Hume pipe, that is, it is shortened to about 1 m.

The front end of the tube 2, that is, the right end in the drawing, has an inner circumferential surface that is continuous with the inner hole of the tube 2, and an outer circumferential surface 2 that is smaller in diameter than the outer diameter D of the tube by a step thickness a.
A fitting convex portion 2b having a shape and a shape is formed into one body by extending by a gap length b, and the inner circumferential surface of the rear end of the tube body 2 has a shape that fits externally into the fitting convex portion 2b. is expanded into the fitting recess 2c, and has a paragraph thickness a.
The dimensions are formed to an appropriate value of 0.4t to 0.6t, and
The dimension of the gap length b is set to an appropriate value of 2t to 6t.

Further, annular grooves 2d are cut into two places on the outer circumferential surface 2a of the fitting convex portion 2b, and a rubber ring 3 for packing is fitted into each annular groove 2d.
The depth c of the annular groove 2d is recessed to an appropriate value of 0.1t to 0.3t.

In addition, the corner edges of the outer circumferential surface 2a of the fitting protrusion 2b and the inner circumferential surface of the fitting recess 2c are rounded or chamfered.

The cross-sectional shape of the rubber ring 3 is circular as shown in FIG. Ring 6 can be used.

Propulsion tube 1 of the first embodiment configured in this way
When the pipe is laid underground by the propulsion method, as shown in Figure 4, the first propulsion pipe 1 is
is pushed into the ground, and then the next propulsion tube 1 is inserted with its fitting protrusion 2b into the inner peripheral surface of the fitting recess 2c of the first propulsion tube 1 via the ring 3. In the same manner, the propulsion tubes 1 are pushed into the ground by the propulsion device, and by repeating this process one after another, the required number of propulsion tubes 1 are laid in a state in which they are spliced into a single tube shape.

Note that if the gap length b is too long, there is a risk that the joint will buckle due to compressive stress in the axial direction during propulsion, so care must be taken.

In such installation work, since each propulsion tube 1 is lightweight, it is easy to handle the propulsion tube 1, and since the standard length of the propulsion tube 1 is short, a vertical shaft with a small area can be used. Furthermore, since the outer circumferential surface of the propulsion tube 1 is a smooth surface made of hard resin and there are no protrusions at the joint, the propulsion load is small, and no special effort is required for plug-in connection. Workability is extremely good, and since the tube thickness t is large, the propulsion tube 1 can sufficiently withstand the compressive force during propulsion, thereby enabling long-distance propulsion.

In addition, a rubber ring 3 is attached to the joint of the propulsion tube 1.
As shown in Figure 4, since
It is possible to sufficiently follow the bending stress expected during propulsion or the external force caused by meandering of the propulsion, resulting in high work safety.

In addition, since the rubber rings 3 are interposed in parallel in the front and rear, for example, the preceding propulsion tube 1
On the other hand, if the trailing propulsion tube 1 is slightly bent,
The front half of the inner wall surface of the fitting recess 2c of the trailing propulsion tube 1 presses against the front half of the rubber ring 3,
Since the other half of the rear inner wall surface of the fitting recess 2c presses against the other half of the rear rubber ring 3, watertightness is maintained, and the front and rear rubber rings 3 Since the elastic force acts in the direction of correcting the bending, it is possible to naturally correct the propulsion meandering of the propulsion tube during propulsion work, thereby improving the reliability of the work.

Furthermore, in the series of propulsion pipes 1 installed in this way, the inner hole of the pipe is completely covered with the smooth surface of hard resin, so it has good hydraulic properties as a sewer system, and the above-mentioned rubber The intervening joint of the ring 3 absorbs expansion and contraction stress due to temperature difference and expansion and contraction external force due to ground movement, making the pipe highly durable.

As described above, according to the present invention, the outer and inner wall surfaces of the synthetic resin propulsion tubes that are connected to each other, including the connecting portions, are both smooth and have the same diameter. It also has low resistance and excellent hydraulic properties.

Furthermore, between the fitting concave portion and the fitting convex portion of the propulsion tubes that are connected to each other, a rubber ring is fitted into an annular groove formed on the outer peripheral surface of the fitting convex portion to shut off water. , just cut the annular groove from the outer circumferential side and insert the small diameter rubber ring into the annular groove with the enlarged diameter.It is easy to form, and the rubber ring can be firmly fitted into the small diameter ring. Not only can you use
When connecting the front end convex part of the trailing propulsion tube to the rear end concave part of the leading propulsion tube, even if the rubber ring becomes misaligned, it can be easily checked from the surface side and there is no problem with the connection, which is excellent in practical terms. effective.

Furthermore, since the rubber rings are interposed in parallel in the front and back, watertightness is maintained even if the connection part of the propulsion tube is bent to some extent, and
This has the effect of naturally correcting propulsion meandering and improving the reliability of the work.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a propulsion tube showing an embodiment of the present invention, Fig. 2 is a perspective view thereof, Fig. 3 is a sectional view of four types of rubber rings, and Fig. 4 is a sectional view of a propulsion tube showing an embodiment of the present invention. It is a cross-sectional model diagram of the same propulsion tube in a coupled state. D...Outer diameter, 1...Propulsion tube, 2...Pipe body, 2a
...Outer peripheral surface, 2b...Fitting convex portion, 2c...Fitting concave portion, 3, 4, 5, 6...Rubber ring.

Claims (1)

[Scope of utility model registration request] In a propulsion tube connection structure in which a plurality of propulsion tubes are connected and laid underground using a propulsion method, each of the propulsion tubes is made of synthetic resin, and the front end of the tube has a hole in the inner hole of the tube. A fitting convex portion having a continuous inner circumferential surface and an outer circumferential surface having a diameter one step smaller than the outer diameter of the tube is molded into one body, and the inner circumferential surface of the rear end of the tube has the above-mentioned fitting convex portion. A fitting concave portion shaped to fit externally into the mating convex portion is molded, and rubber rings are fitted into two ring grooves formed in parallel in front and back positions of the outer circumferential surface of the mating convex portion, respectively. A propulsion tube connection structure characterized in that the outer wall surface and the inner wall surface of each propulsion tube connected to each other are continuous smooth surfaces with the same diameter including the connecting portion.