JPH07150890A - Propusion method for curved pipe line - Google Patents

Abstract

PURPOSE:To make it easier to bury pipes over a long distance by a method wherein a curved pipe line is divided into a plurality of spans, and a sleeve pipe, into which a wire is inserted, is laid in each of the spans, and the sleeve pipes are connected together and thereafter steel pipes are buried, while an excavator is being pulled from a starting shaft. CONSTITUTION:Temporary vertical shafts 31, 32, 33, 34 are installed between a starting shaft 41 and an arrival shaft 42 along a curved road to form a plurality of spans. Thereafter, a sleeve pipe 11 made of polyethylene pipe or the like, into which a pulling material string 3 comprising a wire rope or the like is inserted, is laid in each apan by a small-diameter pipe jacking method, and the pipes 11 are connected together to interconnect the shaft 41 and the shaft 42. And an excavator 10 is pulled by a pulling device 4 from the shaft 41 so that the ground is excavated by the excavator together with the pipes 11, thereby joining steel pipes 7 to lay them underground, wherein the string 3 is wound up by a winch 12, whereby the string 3 can be pulled over a long distance without being subjected to frictional resistance due to earth pressure. As a result, a curved pipe can be easily buried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method for a curved pipeline, and more particularly to a propulsion method for a long-distance curved pipeline of welded steel pipe.

[0002]

2. Description of the Related Art Generally, in the case of forming a pipeline in the ground, the laying work of the pipeline is carried out by so-called excavation work in which a groove is dug in a line to be piped to fill the pipe. However, for example, when road traffic is heavy and it is not possible to work on a road that occupies a long extension work zone for a long time due to excavation work, dig a propulsion shaft at both ends of the laying section and Pipes are laid by a propulsion method that pushes the pipes into the ground while sequentially connecting the pipes from the (starting shaft) to the other shaft (arriving shaft).

When the road is curved and the extension of the straight section cannot be ensured, it has been conventionally known to construct a pipeline by the curved propulsion method. In the propulsion method for curved pipelines that uses pipes whose joints are not rigid, such as Hume pipes, insert an inclined member between the end faces of the continuous pipes to be propelled to propel the pipes so that the bending amount of the pipe row is left or It can be bent to a certain amount to the right and laid, which allows the tube row to draw a curve and propel a curved conduit.

The actual problem is that there is an obstacle in the propulsion section and it is necessary to avoid it,
When it is difficult to install a vertical shaft due to the circumstances of the site, or when it is difficult to go straight due to an underground buried object, etc., a method of driving a curved pipeline with a fume pipe or the like has been constructed according to each site.

[0005]

As described above, the conventional curve propulsion method is possible in the case of a pipe that is connected by a flexible joint such as a fume pipe, but is flexible in the joint such as a welded steel pipe. If there is no, the propulsion method of the curved pipeline is impossible because the rigidity of the pipe is high and it is difficult to correct the direction. Therefore, conventionally, when constructing a gas transportation steel pipe or the like on a curved road by propulsion work, it was necessary to provide vertical shafts by dividing the span into short shafts so that a straight section could be obtained.

In the propulsion method, in general, the longer the construction pipeline length between the shafts is, the more the construction cost per unit extension can be reduced. There is a problem that the construction unit price per unit becomes high. The present inventors have previously provided a technique for laying a long-distance curved pipeline of a welded steel pipe by a propulsion method in order to solve such a problem. (Japanese Patent Application No. 5-269039). The technique is to divide a long-distance curved pipeline into multiple spans, lay a guide pipe from the ground surface to the other end for each split span by the small-diameter pipe propulsion method, and then guide each split span. Connecting pipes to form a guide pipe string over the entire curved pipeline, constructing a starting shaft and a reaching shaft at both ends of this curved pipe, connecting the guide pipe string to the tip of the propulsion machine at the starting shaft, and reaching This is a method for propelling a curved pipeline characterized by propelling a welded steel pipe while pulling it from the vertical shaft side.

This construction method is an excellent construction method and uses a drill pipe used for oil drilling, for example, as a guide pipe, and pulls the pipe directly. However, when the soil is sandy soil, soil for tightening the guide pipe is used. There is a problem that the tension exceeds the strength of the guide pipe when the guide pipe is pulled because the pressure increases and the frictional resistance increases.

In such a case, the guide pipe may be cut in the worst case, and the pulling and propulsion, which are the features of this construction method, cannot be used together. It is an object of the present invention to provide an improved propulsion method for curved pipes that solves such problems.

[0009]

The first invention of the present invention is as follows:
The curved pipeline is divided into multiple spans, and for each split span, a sheath pipe is laid from the surface to the ground by the small-diameter pipe propulsion method, and then a traction material is sequentially connected to the sheath of each split span. While pushing, the traction material of each span is connected to form a traction material string on the entire curved pipeline, and a starting shaft and a reaching shaft are constructed at both ends of the curved conduit, and the guide pipe string is propelled by the starting shaft. This is a propulsion method for curved pipes, which is connected to the tip of the machine and propels the steel pipe while pulling the string of traction material from the reaching shaft side. In this case, depending on the conditions, the sheath tube may be first connected over a plurality of spans or the entire curved pipeline, and then the traction member may be pushed in.

A second aspect of the present invention is to divide a curved pipe into a plurality of spans, and for each of the divided spans, a sheath pipe is laid from the ground surface to the other end by a small-diameter pipe propulsion method,
Next, connect the pods of each split span to form a pod connecting body over the entire curved pipe, construct a starting shaft and a reaching shaft at both ends of the curved pipe, insert a wire rope into the pod,
Connect the wire rope to the tip of the propulsion machine at the starting shaft,
This is a propulsion method for curved pipelines characterized by propelling a steel pipe while pulling a wire rope from the reaching vertical shaft side.

[0011]

The most technical feature of the present invention is that a sheath pipe is laid in the ground by the small diameter pipe propulsion method, a string of traction material is inserted into the sheath pipe, and while pulling the string, a welded steel pipe is formed at the rear end. Propulsion tube is connected by connecting the propulsion tube. Even if the traction material string housed in the sheath pipe has a soil layer of sandy soil, the outer periphery thereof is not clamped by the earth pressure, and therefore the frictional resistance does not increase.

In the present invention, the curved conduit is divided into a plurality of spans of appropriate length. The length of this split span is selected so that the sheath pipe can be constructed by the small diameter pipe propulsion method. The sheath pipe can form a pipeline in the ground by the small diameter pipe propulsion method, and when propelling a large diameter propulsion pipe later, it will be destroyed by the excavator and discharged along with the soil discharge to the rear of the excavator. . The material is preferably synthetic resin such as polyethylene and vinyl chloride.

The traction member is a steel pipe, a steel rod or the like or a wire rope or the like which can be loosely inserted into the inner diameter of the sheath pipe, and the steel pipe, the steel rod or the like has an appropriate length which can be easily connected by a connecting screw. To use. A small-diameter guide boring is suitable as a small-diameter pipe propulsion method for forming a nearly horizontal sheath in the ground. This will be described below. Small-caliber guide boring is a horizontal boring from the ground surface to the ground with a small-diameter rod.A pipe is attached to the tip of this rod and the rod is pulled back to guide the rod into a substantially horizontal pipe. It is a method of laying. This will be described with reference to FIGS.

As shown in FIG. 4, a boring device 21 is placed on the ground, and a small-diameter rod 23 is obliquely advanced from the ground surface 22 through the ground. The rod 23 is hollow and rotatable. FIG. 7 shows an enlarged view of the tip. The hollow rod 23 is eccentric from the tip of the hollow rod 23 and digs into the ground while advancing the water jet 26 and advances. The transmitter 25 is attached to the tip of the rod 23, and the depth of the tip of the rod 23 is detected by a depth detector 27 that moves on the ground to measure the depth of the transmitter 25. The direction of the water jet 26 is controlled by rotating the rod 23 so as to be constant, and the water jet 26 is advanced while confirming the depth.
In this case, when it is difficult to advance the rod due to obstacles or the like in the ground, it is possible to avoid the rod and proceed.

As shown in FIG. 5, the tip 24 of the rod 23 arrives at a small temporary establishment pit 32 provided at the front side, and the rod 24 is expanded in the temporary establishment pit 32 toward the backward direction of the rod 23. A hole expander 28 is attached to the tip of 23.
As shown in FIG. 6, a pod such as a polyethylene pipe 29 is connected to the hole expander 28, and then the rod 23 is pulled back by the boring device 21 to lay the pod or the like in the ground through which the rod 23 passes. The length of the sheath that can be constructed by the small diameter guide boring depends on the diameter of the pipe and the stratum, but a 1-inch (caliber 25 mmφ) hollow rod is usually used and a sheath of 100 mmφ can be laid.

Next, a technique for inserting the wire rope through the sheath will be described. A string or wire rod having an appropriate thickness is attached to the tail end of a parachute-like running tool that fills the inside of the sheath and travels in the pipe by compressed air, and the wire rod is passed from one end to the other end of the sheath tube. Then, a wire rope is connected to the tail end of the wire rod, and the wire rod is pulled to draw the wire rope into the sheath tube.

According to the present invention, a sheath tube is laid so as to pass through the temporary established shafts 31 and 32 provided at both ends of the split span, and a tractive material string that connects the entire curved pipeline by inserting a tractive material into these sheath tubes. It is formed in the ground, and while pulling it, a propelling steel pipe is welded to the rear end and propelled. Since the traction material is inside the sheath, friction resistance due to earth pressure can be eliminated.

According to the present invention, since a long-distance pipeline can be propelled, the degree of freedom in construction, in which the propulsion shaft can be selected at an appropriate location, is remarkably improved. Further, it is possible to select the proper length and the proper both-end positions to be constructed by the small-diameter propulsion method according to the actual situation. The propulsion method of the present invention can also be applied to a conduit whose curvature changes, such as an S-curve conduit or a straight long-distance conduit.

[0019]

Embodiments of the present invention will be described with reference to FIGS. When a curved pipe 1 having a radius of curvature of 800 to 1000 m as shown in FIG. 2 is laid by a propulsion method using a steel pipe having a diameter of 750 mm, a starting shaft 41 and a reaching shaft 42 are provided at intervals of about 500 m, and this section is provided. Was divided into 5 spans of about 100 m per span, and a sheath tube was laid, and this was connected and propelled.

Provisional pits 31, 32, 33, 34 having a diameter of 2 m are provided at the end of each split span, and the guide boring device 21 is installed at one end of each split span, for example, at a position retracted from the temporary pit 31 by about 10 m. A sheath pipe is laid for each split span. This step is the same as that shown in FIGS. The guide boring device 21 has a diameter of 1 inch (caliber 25 mm).
The hollow rod 23 of φ) is rotated, and the water jet 26 is ejected from the tip of the hollow rod 23, and the hollow rod 23 is advanced substantially horizontally toward the temporary establishment pit at the other end of the split span, for example, the temporary establishment pit 32. When the hollow rod 23 arrives at the temporary establishment pit 32, a hole expander 28 is attached to the end of the hollow rod 23, a sheath tube made of polyethylene pipe 29 having a diameter of 100 mmφ is connected to the rear part of the hole expander, and the hollow rod 23 is pulled back. , Caliber 100m along the line of hollow rod 23
Install a mφ sheath tube. By repeating this in sequence, the sheath pipes of each divided span are connected in each temporary establishment pit 31, 32, 33, 34 to form the pod pipe connection body 11 over the entire curved pipeline from the starting shaft 41 to the reaching shaft 42. ..

Then, within the connected body of the sheath tube, at the tail end, 6 mm
Approximately 10k for running equipment that is connected with a thin φ wire
It was run using compressed air of g / cm ² and inserted into a guide wire sheath of 6 mmφ. Next, a wire rope 3 having a diameter of 60 mm was connected to the tail end of the guide wire having a diameter of 6 mm, and the guide wire was pulled by hand to insert the wire rope 3 into the sheath tube.

Next, as shown in FIG. 3, the starting shaft 41
The propulsion device 6 is installed in the, the wire rope 3 is connected to the tip of the propulsion pipe 8, and the propulsion device 6 is used to sequentially propel the steel pipe while welding the propulsion steel pipe. At this time, the wire rope 3 is pulled from the reaching shaft 42 side by the pulling device 4 such as a center hole jack, and at the same time, the steel pipe is pushed in from the starting shaft side. Since the wire rope 3 is inserted into the sheath, the outer circumference of the wire rope is not tightened even if the soil is sandy soil, and therefore the frictional resistance does not increase and the traction force of the traction device is reduced. Without pulling, pull the propulsion pipe. On the side of the reaching shaft 42, the wire rope is wound by the winch 12. The 60 mmφ wire rope 3 can be pulled up to 200 tons without any problem.

The excavator 10 excavates the propulsion pipe line including the sheath pipe 11, advances the excavated soil while unloading the soil from the starting shaft 41, and propels the propulsion pipe 8. Since the excavator 10 at the tip of the propulsion pipe 8 follows the wire rope 3 and advances, it can be easily propelled along the planned curved pipeline.

[0024]

According to the present invention, the propulsion construction of the long-distance curved pipeline of the welded steel pipe can be conducted even in the stratum of sandy soil.

[Brief description of drawings]

FIG. 1 is a schematic plan view for explaining an embodiment.

FIG. 2 is a schematic plan view for explaining an example.

FIG. 3 is a schematic elevational view for explaining the embodiment.

FIG. 4 is an explanatory view showing a construction process of a sheath tube.

FIG. 5 is an explanatory diagram showing a sheath tube construction process.

FIG. 6 is an explanatory view showing a sheath pipe installation process.

FIG. 7 is a side view of a distal end portion of a hollow rod.

[Explanation of symbols]

 1 Curved Pipeline 2 Road 3 Traction Material String (Wire Rope) 4 Traction Device 6 Propulsion Device 7 Steel Pipe 8 Propulsion Pipe 10 Excavator 11 Sheath Pipe 12 Winch 21 Boring Device 22 Ground Surface 23 Rod 24 Tip 25 Transmitter 26 Water Jet 27 Depth Detector 28 Expander 29 Polyethylene pipe 31, 32, 33, 34 Temporary establishment pit 41 Starting shaft 42 Arrival shaft

Claims (2)

[Claims] 1. A curved pipe is divided into a plurality of spans, and for each divided span, a sheath pipe is laid from the ground surface to the other end by a small-diameter pipe propulsion method, and towed into the sheath of each divided span. Pushing while sequentially connecting the materials, then connecting the traction materials of each span to form a traction material string over the entire curved pipeline, and constructing a starting shaft and a reaching shaft at both ends of the curved pipeline, and the traction material string A method of propelling a curved pipe, characterized in that the steel pipe is propelled while the string is connected to the tip of the propulsion machine at the starting shaft and the string of traction material is pulled from the reaching shaft. 2. A curved pipe is divided into a plurality of spans, and for each divided span, a sheath pipe is laid from the ground surface to the other end by the small diameter pipe propulsion method, and then the sheath pipe of each divided span is divided. Connected to form a pod connecting body in the whole curved pipeline, constructing a starting shaft and a reaching shaft at both ends of the curved pipe, inserting a wire rope into the sheath pipe, and using the wire rope in the starting shaft. A propulsion method for curved pipes, characterized in that it is connected to the tip of a propulsion device and propels a steel pipe while pulling a wire rope from the reaching shaft.