JPH08338567A - Burying process for gas pipe line - Google Patents

Abstract

PURPOSE: To reduce the construction period, the labor for the construction and the cost thereof by providing the steps of slinging up one end of an existing gas pipe line above the ground from an excavated channel with the use of a flexibility of the pipe, and slinging down the one end of the pipe into the channel after it is welded to a new pipe line on the ground, and burying the groove in part, and by repeating these steps. CONSTITUTION: When a gas pipe line is buried, a pipe sling device 2 is moved toward a part in the vicinity of a gas pipe P-1 which has been previously buried and projected within a channel 1. Then the one end part of the gas pipe is slung up by means of a hoist 2-3, and then, a pipe holding bogie 3 is moved to the device 2, and the height of a next pipe P-2 slung up by a hoist 3-3 is adjusted so that its inclined angle is set at the same angle as that of the gas pipe P-1. Thereafter, both pipes are made at their ends to abut against each other, and are then welded together. Then, thus welded pipes are slung down into the channel 1, and sediment to be refilled is charged in the groove so that the pipes are in part embedded. Thereafter, a succeeding channel is excavated, and a process similar to that mentioned above is repeated so as to the gas pipe line is buried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method for burying a flexible gas pipe, and more specifically, laying it in a trench while performing pipe welding on the ground by utilizing the flexibility of the gas pipe. The buried construction method.

[0002]

2. Description of the Related Art Conventionally, underground burial work for gas pipes has been carried out by the following method. That is, as shown in FIG. 4, an excavation groove 11 having a predetermined length and a plurality of welding halls 12 are formed by excavation work at a place where a gas pipe is buried.
At the welding hall 12, the inner wall of the welding hall 12 is retained with a sheet pile 13 in consideration of the safety of welding work. When laying a gas pipe in the excavation groove 11, for example, two gas pipes P-2 in which two single pipes are previously welded to form a single gas pipe P-2 according to the length of the excavation groove are shown in the drawing. In the welding hall 12, a worker welds the two gas pipes P-2 and the existing pipe P-1.
Weld with. After that, pull out the retaining sheet pile 13,
When the inside of the excavation groove 11 is backfilled leaving the tip side of the earliest pipe, the excavation groove 11 for the next pipe and excavation work at the welding hall and earth retaining work at the welding hall are performed again, and the same pipe suspension as above is performed. The method is to take down and repeat underground welding work in order to bury the gas pipes.

[0003]

However, the above-mentioned conventional burying method has the following problems.
That is, in the past, since welding of an existing pipe and a pipe to be welded connected to the pipe and a pipe connecting the pipes to be welded are performed underground, it is necessary to provide a welding hall 12 in the excavation groove 11 without fail. In addition to the construction work, the excavation work of the welding hall and the earth retaining work by the sheet pile of the welding hall are required, and there is a problem that it takes a lot of time and labor to construct the excavation groove and the welding hall, and the construction period is long. In addition, the gas pipes laid in the excavation trench 11 are usually welded in advance at another place (a place away from the construction site, a factory, etc.) with two or three pipes and transported to the construction site in advance, so there is no time loss. Is large and inefficient. Further, there is a problem that the welding work at the welding hall is not preferable in terms of workability and safety.

The present invention has been made in order to solve the above problems of the conventional method and does not require a welding hall.
Moreover, the present invention intends to propose a method for burying gas pipes that enables efficient pipe welding while sequentially welding the gas pipes one by one on the excavation groove without requiring pre-welding of the pipes.

[0005]

A method for burying a gas pipe according to the present invention is a method for laying a pipe in an excavation groove while performing pipe welding on the ground by utilizing the flexibility of the gas pipe. In the method of burying a gas pipe in which a gas pipe of a certain length is laid in the excavation groove while being sequentially welded, and the excavation groove is backfilled and buried, the existing pipe end in the excavation groove is lifted to the ground and held After welding the gas pipe held in front of this gas pipe and the existing pipe on the ground, the pipe is suspended in the excavation groove, then the excavation groove is partially backfilled, and the existing pipe is lifted in the same manner as above. It is characterized by repeatedly performing ground welding, hanging, and backfilling work.

[0006]

As a means for suspending and holding the existing pipe end in the excavation groove to the ground, for example, a pedestal is installed on a trolley that is movably provided in the opening of the excavation groove so as to be movable in the longitudinal direction of the excavation groove. A pipe lifting device equipped with a hoist, a chain block, a small towing machine, etc. can be used.

As a means for holding the gas pipe to be welded to the existing pipe at the same angle as the existing pipe in front of the existing pipe hoisted and held by the pipe hoisting device or the like, a groove is formed at the opening of the excavation groove. A pipe is mounted on a trolley that is movably mounted in the longitudinal direction, and a hoist, a chain block, a small traction machine, and the like similar to the pipe lifting device are attached to the cradle, or a pipe holder on the trolley. It is possible to use a pipe holding carriage or the like with a mounting base attached.

According to the present invention, the pipe end portion of the existing pipe in the previously buried excavation groove is held at the same angle as the existing pipe by the pipe holding truck while being lifted to the ground by the pipe lifting device. Since the next pipe end of the next gas pipe can be welded on the ground, it is not necessary to provide a welding room in the excavation groove. After welding, the pipe holding truck is retracted to separate it from the gas pipe held by the truck, and the pipe is laid by suspending the gas pipe in the excavation groove with a pipe lifting device.
After that, the backfilling operation of the excavation groove can be subsequently performed. After partially backfilling the excavation trench, the same work is repeated again to sequentially bury the gas pipe. At that time, the excavation of the excavation groove is sequentially performed according to the burying work of the gas pipe.

The hoisting, ground welding and hoisting work of the gas pipe on the excavation ditch line in the present invention can be performed relatively easily and in a short time, so that the efficiency of burying the gas pipe can be significantly improved. The construction period can be shortened.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical cross-sectional side view showing a gas piping construction apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the same gas piping construction apparatus, 1 is an excavation groove, 2 is a pipe lifting apparatus,
Reference numeral 3 is a pipe holding carriage, and 4 is a welded portion.

The pipe lifting device 2 is mounted on a carriage 2-1 which is movably mounted in the opening of the excavation groove 1 so as to be movable in the longitudinal direction of the groove.
Hoist which installs 2 and hangs a gas pipe on the stand 2-3
It has a structure with attached. Reference numeral 2-4 is a jack for fixing the carriage 2-1 to a fixed position.

The pipe holding truck 3 is mounted on a truck 3-1, which is movably mounted in the opening of the excavation trench 1 so as to be movable in the longitudinal direction of the trench.
And a hoist for holding the gas pipe in an inclined manner on the gantry 3-
Here, the structure is such that two 3 are attached. Reference numeral 3-4 is a jack for fixing the carriage 3-1 at a fixed position.

When burying a gas pipe with the above-mentioned gas pipe laying apparatus, as shown in the drawing, near the pipe end portion of the existing gas pipe P-1 which has been burried first and protrudes into the excavation groove 1. Move the pipe lifting device 2 to and fix it with the jack 2-4. Behind this pipe hoisting device 2, a pipe holding carriage 3 equipped with a gas pipe P-2 to be connected next stands by. When the pipe lifting device 2 is fixed at a predetermined position, the pipe end of the existing gas pipe P-1 is lifted to the ground by the hoist 2-3 and is held at that position. Then, the pipe holding carriage 3 is moved to the pipe lifting device 2 side, and when the pipe holding carriage 2 is approached, the next gas pipe P-2 is lifted by the hoist 3-3 of the pipe holding carriage 3, Operate both hoists 3-3 so that the existing gas pipe P-1 hoisted by the hoist 2-3 of the pipe hoisting device 2 has the same angle.
An existing gas pipe P-1 that is suspended by the pipe suspension device 2
When the pipe end of the next gas pipe P-2 tilted and held by the pipe holding carriage 3 is abutted against the pipe end of No. 3, the pipe holding carriage 3 is fixed by the jack 3-4, and both pipes are welded on the ground. To do. Welding is usually done manually, but it is also possible to use an automatic welder.

When the welding of the pipe is completed, the hoist 2-3 of the pipe lifting device 2 is operated to connect the welded gas pipe to the excavation groove 1
When the pipe lifting device 2 is retracted to the vicinity of the pipe holding carriage 3, the pipe suspended halfway is suspended again by the hoist 2-3. Next, in this state, the hoist 3-3 of the pipe holding carriage 3 is operated to hang the pipe to the same height as the above, and in this state, the pipe holding carriage 3 is retracted to the pipe end position and the hoist 3-3 again. 3, the pipe end is hung, and in this state, the hoist 2-3 of the pipe lifting device 2 and the hoist 3-3 of the pipe holding carriage 3 are operated to cut the pipe into the excavation groove 1
Hang it at the bottom of the. After that, the backfill earth and sand is carried into the excavation groove 1 by a dump truck (not shown), and the excavation groove 1 is backfilled to a position where the welded pipe end of the gas pipe P-2 can be lifted. Also, excavate the excavation groove required for laying the next gas pipe with a shovel car (not shown).

When the backfilling work of the excavation groove 1 is completed, the pipe lifting device 2 is retracted to a predetermined position in order to perform the welding work of the next gas pipe, and the same work is repeated again to sequentially weld the gas pipes. Lay it. That is, the pipe end of the existing gas pipe P-2 protruding into the excavation groove 1 is connected to the pipe lifting device 2
At that time, the pipe holding carriage 3 for holding the next pipe is brought close to the pipe lifting device 2 to bring the pipe ends into contact with each other, and welding is performed on the ground to move the pipe lifting device 2 and the pipe holding carriage 3 sequentially. The gas pipe welded by the above method is suspended in the excavation groove 1, and backfilling of the excavation groove and excavation of the excavation groove are performed at any time to embed the pipe.

As described above, according to the present invention, the flexibility of the gas pipe is utilized to repeat the above operations in the order of hoisting the gas pipe end, ground welding, hoisting and backfilling, and welding and embedding of the gas pipe. Perform construction. The excavation of the excavation trench is performed at any time according to the pipe laying work.

Although the drawing shows a state in which the pipe is held while being inclined, the welding can be performed by holding the pipe horizontally. In that case, the hoisted pipe is held horizontally on the ground, and the next pipe is also held horizontally by the pipe holding carriage 3 to perform welding. Further, as the pipe holding carriage, it is possible to use a pipe holding carriage in which a pipe mounting base 3-5 is installed on a carriage 3-1 as shown in FIG. 3 in place of the hoist hoisting system. At this time, when welding is performed while holding the pipe inclined, it is possible to use a pipe holding carriage having a pipe mounting table 3-5 whose upper surface is a slope. The angle of the slope of the pipe placement table 3-5 is determined according to the inclination angle of the existing pipe suspended by the pipe suspension device 2. Further, a pipe clamp jig or the like for positioning and fixing the gas pipe can be provided on the upper surface of the pipe mounting table.

[0018]

As described above, according to the embedding method of the present invention, the following effects can be obtained. (1) Since the existing gas pipe can be hung up above the ground by utilizing the flexibility of the gas pipe, the next gas pipe can be welded on the ground while being laid in the excavation groove. Since it is not necessary to provide a welding hall in the interior, and therefore, the excavation work of the welding hall and the earth retaining work with sheet piles are unnecessary, the time, labor, and cost required for such construction can be reduced. (2) The gas pipe hoisting, ground welding, and hoisting work on the excavation ditch line can be performed relatively easily and in a short time, and these works can be performed continuously and smoothly. , There is little time loss during construction, and the efficiency of burying gas pipes can be greatly improved. (3) The pipe lifting device and pipe holding cart required for burial work are
Not only is it structurally extremely simple, but it does not require expensive equipment or devices, so it is not expensive, and the pipe lifting device and pipe holding cart are easy to operate on the ground, just like welding work. It can be done in a safe manner,
Moreover, it can be performed simply, quickly and efficiently without much labor and time. (4) Since the gas pipes are welded one by one and laid inside the excavation trench, there is no need to carry a plurality of welded welded pipes to another site as in the conventional case. (5) It is possible to reduce the construction period and the construction cost of underground burial work for gas pipes.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a gas pipe construction device according to an embodiment of the present invention.

FIG. 2 is a plan view of the above gas pipe construction device.

FIG. 3 is a side view showing another embodiment of the pipe holding truck in the above gas pipe construction device.

FIG. 4 is a schematic view showing an example of a conventional gas pipe burying method, (a) is a vertical sectional side view of a digging groove portion, and (b) is a plan view of the digging groove portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 excavation ditch 2 pipe lifting device 2-1 trolley 2-2 pedestal 2-3 hoist 2-4 jack 3 3 pipe holding trolley 3-1 trolley 3-2 pedestal 3-3 hoist 3-4 jack 4 welded part P-1, P-2 gas pipe

Claims (2)

[Claims] 1. A method for burying a gas pipe in which a gas pipe of a certain length is laid while being sequentially welded in the excavation groove, and the excavation groove is backfilled to be buried by utilizing the flexibility of the gas pipe. The existing pipe inside the pipe end is lifted and held to the ground, the gas pipe held in front of this gas pipe and the existing pipe are welded on the ground, and then the pipe is suspended in the excavation groove, and then the excavation groove is formed. A method for burying gas pipes, characterized in that after partially backfilling, the existing pipe is lifted, ground welded, suspended, and backfilled in the same manner as above. 2. As a means for suspending and holding the existing pipe end in the excavation trench to the ground, a mount is installed on a carriage that is movably mounted in the opening of the excavation trench so as to be movable in the longitudinal direction of the trench. A hoist, chain block, small towing machine, or other hoisting device is used to hold the hoisting device at the same angle as the existing pipe. Install a pedestal on the trolley that spans,
The pipe holding carriage having a structure in which a hoist, a chain block, a lifting machine such as a small towing machine is attached to the frame, or a pipe holding carriage having a pipe mounting table installed in the carriage is used. How to bury gas pipes.