JPH0579284A - Propulsion pipe - Google Patents

Abstract

PURPOSE:To correctly set a sewer pipe which effectively prevents the sedimentation, piling, etc., of dirt and solid articles at a prescribed attitude, so as to be advanced by a circular propulsion means which is used in common, without requiring the backing work, etc., which incur the increase of the execution manhour. CONSTITUTION:The sectional shape on the inner periphery 2 of a propulsion pipe 1 is formed to an oval shape, and the sectional shape of the outer periphery 3 is formed to a circular form. In order to prevent the deflection in the revolution during and after the propulsion, a differential port 1a having an oval-shaped outer peripheral section is formed at one edge part of the propulsion pipe 1, and a receiving port 1b having the oval shaped inner peripheral section corresponding to the outer peripheral sectional shape of the differential port 1a is formed at the other edge part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion pipe, that is, a pipe buried in the ground by a propulsion method.

[0002]

2. Description of the Related Art For example, as a sewage pipe buried in the ground, conventionally, as shown in Japanese Utility Model Publication No. 52-43181, the cross section of the inner circumference is formed in an oval shape and the outer circumference is formed. There is known a tube having a circular cross section and a so-called oval tube having an inner cross section and an outer cross section each having an oval shape (see Japanese Patent Application Laid-Open No. 1-210595). According to this type of pipe, the water depth at low speed is deeper than that of a circular pipe, and the flow velocity is also increased by that amount, so it is possible to prevent sedimentation and accumulation of dirt and solids.

On the other hand, since it is necessary to reduce the amount of excavated soil and the excavated area when burying a pipe, in recent years, a propulsion method has been adopted in which a pipe is press-fitted from a vertical shaft using an excavator or the like or the pipe is inserted after excavation. Often. However, in the case of an oval tube, since the cross-sectional shape of the outer circumference is not a circle but a special shape of an oval shape, it is difficult to use a normal excavator having a circular excavation cross section.

Therefore, in the excavator disclosed in the above-mentioned Japanese Patent Laid-Open No. 1-210595, the excavator main body is composed of the large-diameter side advancing means and the small-diameter side excavating means for advancing the large-diameter portion and the small-diameter portion of the oval cross section, respectively. The two excavating means simultaneously excavate other gaps so that the excavated cross section has an oval shape, and then the oval tube is pushed in to promote the excavation.

[0005]

However, according to the above-mentioned pipe having a circular outer peripheral cross-sectional shape and an inner peripheral cross-sectional shape, when the pipes are buried by the propulsion method, the pipes must be connected with each other using a normal circular collar. When connecting, the pipes may be displaced from each other due to the rotation around the pipe axis, and the oval shapes of the inner peripheral cross-sections may not match.

Further, according to the technique of using the excavator dedicated to the oval tube described above, two excavating means of large and small sizes must be provided for excavating in an oval cross section, which complicates the structure of the excavator. In other words, there is a problem that the pipe can be propelled only by using a machine for excavating an oval tube, which is more complicated than a normal machine. Further, when unsoiled sand is left in the gap between the large and small excavation means, the tube body may be destroyed as a result of the pressure of the sand directly acting on the tube.

[0007] It should be noted that excavation is performed in a circular cross-sectional shape having the major axis of the oval tube as a diameter, and a slurry material containing a solidifying material is injected (so-called backfilling) into the gap between the oval tube and the excavation hole. There is technology, but in that case, it is unavoidable that the number of construction steps will increase by the amount of injection of mud material, and after the propulsion, for example, if the solidifying material is uncured, the oval tube may collapse and not be set correctly. is there.

The present invention has been made in view of the above points, and is a circular shape which is generally used as a pipe suitable for a sewer pipe or the like which can effectively prevent sedimentation and accumulation of dirt and solids. An object of the present invention is to provide a propulsion tube that can be propelled by an excavation means, does not require backfilling work that would increase the number of construction steps, and can be set correctly in a predetermined posture. .

[0009]

To achieve the above object, the present invention is configured as follows in a propulsion pipe which is continuously propelled by a leading conductor of an excavator and is buried in the ground. That is, the inner peripheral cross-sectional shape is formed into an oval shape, while the outer peripheral cross-sectional shape is formed into a circular shape, and one end has an oval or irregular outer peripheral cross-sectional shape and the other end has the difference. Receiving ports each having an oval or irregular peripheral cross-sectional shape corresponding to the peripheral cross-sectional shape of the mouth are provided.

Here, the oval shape which is the inner peripheral cross-sectional shape of the propulsion pipe may be smaller than the oval shape which is inscribed in the circular shape which is the outer peripheral cross-sectional shape. Even if the surrounding earth pressure acts on the thin portion (corresponding to the long axis direction of the egg shape), it is necessary to secure a wall thickness that can withstand this. This wall thickness may be determined according to the buried depth of the propulsion pipe.

Examples of the material of the propulsion pipe include general-purpose thermoplastic resins such as polyvinyl chloride and polyethylene, fiber reinforced resin (FRP), and glass fiber reinforced thermosetting resin (for example, glass fiber reinforced with glass fiber if necessary). Polyester / glass fiber laminate) and the like. Even when the propulsion pipe of the present invention is used, excavation, earth removal, and the like can be performed by a known propulsion method, and there is no problem even if the construction sequence is the same as the conventional one.

[0012]

According to the propulsion pipe having the above structure, the cross-sectional shape of the outer circumference is circular. Therefore, by making the diameter of the circle correspond to the diameter of the excavator forward conductor, the cross section of the excavation hole to be excavated by the forward conductor. It is possible to substantially eliminate the difference in shape and size between the section and the cross section of the propulsion tube (the section in the direction orthogonal to the tube axis). Therefore, the resistance acting on the propulsion pipe at the time of propulsion is reduced, and the load on the propulsion pipe is reduced accordingly. Therefore, it is possible to avoid an increase in construction man-hours.

Further, since the cross-sectional shape of the outer circumference is circular, the propulsion pipe can be propelled by various circular excavation means which have been generally used in the propulsion method. Furthermore, since the cross-sectional shape of the inner circumference is oval, it can exhibit the same function as that of a conventional oval tube, that is, the function of effectively preventing precipitation or accumulation of dirt or solid matter.

Further, the outer peripheral cross-sectional shape of the spout provided at one end of the propulsion pipe is oval or irregular, and the inner peripheral cross-sectional shape of the receiving end provided at the other end is the aforementioned spout outer peripheral cross-sectional shape. Since the corresponding oval or irregular shape is used, when the following propulsion pipes are sequentially connected to the front propulsion pipe for propulsion, those corresponding receiving ports and connecting ports are connected in the correct positional relationship. It As a result, the displacement due to the rotation around the pipe axis during and after the propulsion is prevented, and the propulsion pipe is set in a predetermined posture so that the oval shape of the inner peripheral section faces the correct direction.

[0015]

EXAMPLES Examples of the present invention will be described below. 1 and 2 show an embodiment of the present invention. As shown in the figure, in the propulsion pipe 1 according to this embodiment, an inner circumference 2 has an oval cross section and an outer circumference 3 has a circular cross section. The circular size, that is, the diameter, is set to be substantially the same as the diameter of the tip conductor (not shown) of the excavator used to propel the propulsion pipe 1.

The propulsion pipe 1 is provided with a spigot 1a at one end and a receiving port 1b at the other end. The cross-sectional shapes of the outer periphery of the spigot 1a and the inner periphery of the receiving port 1b are egg-shaped corresponding to each other, so that the propulsion pipe 1 is sequentially connected to the leading conductor that advances while excavating underground. When the propelling pipes are propelled, the corresponding receptacles 1b and the corresponding spouts 1a are connected in a correct positional relationship, that is, the oval shape of the inner peripheral cross-section of the propulsion pipes 1 is not displaced between the propulsion pipes. It has become so.

In the propulsion pipe 1 thus constructed, the outer periphery 3 has a circular cross-sectional shape and the diameter of the circle is set to be substantially the same as the diameter of the excavator tip conductor. Cross-section of excavated hole and propulsion pipe 1
There is no difference in terms of shape and size between the section and the section (section perpendicular to the tube axis). Therefore, the resistance acting on the propulsion pipe 1 during propulsion is reduced, and the load on the propulsion pipe 1 is reduced accordingly.

Further, since there is no gap between the propulsion pipe 1 and the above-mentioned excavation hole, which requires backfilling, backfilling work becomes unnecessary. As a result, it is possible to avoid an increase in construction man-hours. Further, as a result of the outer peripheral surface 3 having a circular cross-sectional shape, the propulsion tube 1 can be propelled by various circular excavation means that have been generally used in the propulsion method. It is not necessary to use the digging means of.

On the other hand, since the cross-sectional shape of the inner circumference 2 is oval like the conventional oval tube, it prevents the function peculiar to this kind of tube, that is, the precipitation and accumulation of dirt and solids. The obtained function can be fully exerted. Moreover, the propulsion tube 1
Since the outer peripheral cross-sectional shape of the spigot 1a provided at one end and the inner peripheral cross-sectional shape of the receiving opening 1b provided at the other end are formed in a corresponding oval shape, When the propulsion pipes are sequentially connected and propelled, the corresponding receiving port 1b and the corresponding opening 1a are connected in a correct positional relationship.
As a result, the displacement due to the rotation around the pipe axis during and after the propulsion is prevented, and the propulsion pipe 1 is set in a predetermined posture so that the oval shape of the inner peripheral section faces the correct direction.

In the above embodiment, the outer peripheral cross-sectional shape of the spigot 1a and the inner peripheral cross-sectional shape of the receiving opening 1b are oval, but it is needless to say that they may be formed in an elliptical shape or another irregular shape. is there.

[0021]

As described above, according to the present invention, since the outer peripheral cross-sectional shape of the propulsion pipe can be matched with the shape of the leading conductor at the tip of the excavator, almost all tip resistance directly received from excavated soil during propulsion is excavated. It is possible to burden the conductor on the machine tip, and accordingly reduce the burden on the propulsion pipe during propulsion. This makes it possible to reduce the risk of breakage of the propulsion pipe during propulsion.

Further, since there is no gap between the cross section of the excavated hole and the propulsion pipe, it is not necessary to carry out backfilling, and the number of construction steps can be reduced accordingly. Further, since the conventional general excavation means having a circular cross section can be used, it is not necessary to specifically use the excavation means dedicated to the oval tube having a complicated structure. Moreover, when the following propulsion pipes are sequentially connected to the front propulsion pipe for propulsion, the receptacles and the spouts that make up these connecting parts are connected in the correct positional relationship, so The subsequent displacement due to the rotation around the tube axis is prevented, and the propulsion tube is set in a predetermined posture so that the oval shape of the inner peripheral section faces the correct direction.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a propulsion pipe showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a cross-sectional shape of the spout taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a cross-sectional shape of a receptacle cut along the line BB in FIG.

[Explanation of symbols]

 1 ... Propulsion pipe, 1a ... Spare, 1b ... Reception, 2 ... inner circumference, 3 ... outer circumference.

Claims (1)

[Claims] 1. In a propulsion pipe that is continuously propelled by a leading conductor of an excavator and is buried in the ground, the inner peripheral cross-sectional shape is formed in an oval shape and the outer peripheral cross-sectional shape is formed in a circular shape. An outlet having an oval or irregular outer peripheral cross-sectional shape is provided at the portion, and a receptacle having an egg-shaped or irregular inner peripheral sectional shape corresponding to the outer peripheral sectional shape of the outlet is provided at the other end. A propulsion tube characterized by.