JPH0727299A - Structure and execution method of float type pipeline - Google Patents

Abstract

PURPOSE:To provide a pipeline installing structure and its execution method to release the difficulties of the maintenance by the burial type method in a high water level ground of a damp ground, and to release the difficulties to erect the frame on a soft ground by a frame type method. CONSTITUTION:A trench 1 is dug in a damp ground, a floater 3 is floated on the water when the water level is high, the pipeline is locked to the floater 3, and the floater 3 is locked to a sinker 7 by a mooring chain 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline structure and its construction method when the pipeline is laid on soft ground in a wetland.

[0002]

2. Description of the Related Art Conventionally, the structure of a wetland pipeline has been either a buried type as shown in FIG. 3A or a pedestal type as shown in FIG. 3B. In each case, a series of operations such as excavation, construction of a gantry, laying of pipelines, and connection of pipes were performed on site.

[0003]

When a pipeline is laid by a burying method or a pedestal construction method in a place where the groundwater level is high on soft ground, it is difficult to secure a material transportation path and construct a pedestal with the conventional structure. there were. Moreover, especially with the burial method, maintenance of pipelines buried underground was extremely difficult. Thus, the construction period becomes longer and the construction cost becomes longer.
There is a problem that maintenance cost increases. The present invention has been devised to solve these problems.

[0004]

According to the present invention, a high groundwater level is secured while excavating a trench along a line where a pipeline is to be laid. Separately, a box-shaped floater on which a pipe is mounted is manufactured, and a long pipeline is mounted and locked on several floaters to form a floating pipe unit. The floater shall have sufficient buoyancy to float the floating pipe unit on the water surface. The floating pipe unit is drawn into the trench and floated on the water, connected with a sinker with a holding chain, and the free movement of the floater is suppressed to further connect the floating pipe units while excavating the trench to connect the plurality of wet pipes. Configure the pipeline.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the details of the structure of the floating pipeline of the present invention.

(A) is a side view and (b) is a plan view.
(C) is a perspective view of a floater. FIG. 2 shows the construction sequence of the present invention.

(A) shows excavating a trench, (b) shows assembling a pipeline unit in an assembling yard, (c) shows pulling a floating pipe unit into the trench, and (d). )
Shows that the floating pipe unit is sent out and joined, (e) shows that the sinker is set, and (f) shows where the floater and sinker are moored and the pipeline is completed.

The present invention will be described below with reference to FIGS.

As shown in FIG. 2 (a), a temporary road is constructed on soft ground, and a trench 1 for laying a floating pipeline is excavated by a mobile simple excavator, for example.
First, the trench 1 may be excavated so that approximately one floating pipe unit 2 can be laid. Figure 2
As shown in (b), the pipeline unit 2 is assembled in the pipeline unit assembly yard. Details of the configuration of the floating pipe unit are shown in FIG. First, a steel shell made of, for example, an iron plate that floats in the trench 1 is manufactured, and styrene foam or the like is filled into the floater 3 so that sufficient buoyancy can be obtained even during corrosion of the steel material. When the floater 3 is floated to the water level of the trench 1, the shoreline is estimated to be about 15 cm during operation with the pipe 4 mounted thereon. The floater 3 has a U-shaped band 5 for locking the pipe 4 to the floater 3.
Loosen and fasten with bolts. Since the pipe 4 expands and contracts due to the temperature of the transported goods inside and the radiant heat of the sun,
Band 5 does not bind tightly. Protective gusset 6 for pipe 4
Is welded to the floater 3 to protect the pipe 4 from movement and drop. The number of pipes 4 to be locked to the floater 3 can be one to several. In this example, there are two pipes 4 and 5m
It is locked to the floater 3 at intervals. Next, FIG. 2 (c)
As shown in (b), the floating pipe unit 2 assembled in (b) is drawn into the trench 1 with a winch 9, for example. The floating pipe unit 2 can easily move in the trench 1 by the buoyancy of the floater 3. The floating pipe unit 2 is sent out in parallel with the excavation of the trench 11 for the next floating pipe unit 2 as shown in FIG. Next, the work of pulling in the floating pipe unit 2 is repeated. The pipes at the joint will be welded together in-situ. Next, a sinker 7 made of concrete, for example, as shown in FIG. 1 is sunk in the vicinity of each floater 3. This state is shown in FIG. Finally, the sinker 7 is locked to the floater 3 by the mooring chain 8 to complete the pipeline. This state is shown in FIG. Even after the pipeline is completed, it can move up and down due to buoyancy, and the pipeline is kept above the water surface even during flooding.

[0010]

The effects of the present invention are as follows.

(A) It does not involve the difficult work of constructing the mount on the soft ground of the wetland unlike the mount type.

(B) Since excavation of the trench 1 can be performed in parallel with the assembling of the floating pipe unit 2 consisting of the pipe 4, the gusset 6, the U-shaped band 5 and the floater 3, the work efficiency is good and the construction period is short.

(C) It is possible to flexibly deal with the expansion and contraction of the pipe due to the temperature of the transported material in the pipe, solar radiation heat, and the like. In addition, the work to keep the transported goods warm is easy.

(D) In the burial method, maintenance is very troublesome when a trap occurs in the pipeline,
Since the structure of the present invention has a pipeline on the ground, maintenance is extremely easy.

[Brief description of drawings]

FIG. 1 is a detailed view of a floating pipe unit. (A) is a front view, (b) is a top view, and (c) is a perspective view of the floater.

FIG. 2 shows a construction method of a floating pipeline. (A) Trench excavation. (B) Floating pipe unit assembly. (C) Pulling in the floating pipe unit. (D) Sending out and joining the floating pipe unit. (E) A sinker set. (F) Mooring and completion. Are shown in this order.

FIG. 3 shows a conventional method (a) is a buried type and (b) is a gantry type.

[Explanation of symbols]

1 ... Trench, 2 ... Floating pipe unit, 3 ... Floater, 4 ... Pipe, 5 ...
U-band, 6 ... Gusset, 7 ... Sinker, 8 ...
..Mooring chains, 9 ... winches

Claims (2)

[Claims] 1. A pipeline unit 2 is constructed by locking a pipe to a floater 3 having a sufficient buoyancy to support the weight of the pipeline unit at an interval suitable for supporting the pipeline unit 2. The pipe of the line unit 2 is welded on site to form a pipeline, and the sinker 7 is submerged in the vicinity of the floater 3 and the floater 3 is attached to the sinker 7.
The structure of a floating pipeline, which is characterized by being moored. 2. A pump is locked on a floater 3 which has sufficient buoyancy to support the weight of the pipeline unit 2 at intervals suitable for supporting the pipeline unit 2 by excavating the trench 1 in a wetland with a high groundwater level. Then, the pipeline unit 2 is constructed, the pipeline unit 2 is drawn into the trench 1 to float on the water surface, the next pipeline unit 2 is drawn into the trench 1 excavated in parallel, and the pipe 4 is welded on site. The method of constructing a floating pipeline, characterized in that the sinker 7 is submerged in the vicinity of the floater 3 and the floater 3 is moored to the sinker 7 while repeating the above-mentioned joining.