JP2848936B2 - Pipeline repair method and apparatus - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method and an apparatus for repairing a pipeline for transporting a fluid such as crude oil or natural gas over a long distance, and more specifically, onshore and offshore operations. The present invention relates to a method and an apparatus for repairing a relatively small-diameter pipeline having a diameter of 1 m or less laid on the seafloor.

[Prior art] It has been recognized that pipeline transportation is economically advantageous for transporting fluids over long distances.
It is used to land natural gas on land. Then, maintenance and securing of the safe driving and various inspection methods are examined and implemented. For example, inspection of corrosion of a welded portion is performed by processing data of a plane image or a cross-sectional image of a pipe wall surface of a pipeline using the principle of ultrasonic waves.

[Problem to be Solved by the Invention] According to the above-described inspection method, it is possible to know the corrosion of the pipe wall, but there is a disadvantage that it cannot be repaired. In other words, the ultrasonic inspection is to fill the pipe with a liquid such as water, the sound wave reaches the pipe wall via water, and detects the reflected wave, and the liquid is filled in the pipe. Therefore, the damaged part of the pipe wall can be inspected but not repaired.

Accordingly, an object of the present invention is to provide a method and an apparatus for repairing a pipe, that is, a pipeline capable of repairing as well as inspecting a pipe wall. That is, an object of the present invention is to provide a pipeline repair method and a repair device that allow a person to enter the pipeline and perform maintenance and inspection of the pipeline.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a shut-off step of shutting off a pipe wall of a pipe filled with water with a movable partition wall device, and a step of shutting off one pipe cut off by the step. A draining step of draining water, a weight setting step of introducing a weight device for preventing a pipe from being lifted up in a pipe from which water has been drained and replaced with air, Repeatedly, replace the entire pipeline with air,
In addition, it is configured to check and repair the pipe wall while preventing lifting.

Further, the invention according to the second aspect of the present invention is a movable partition wall device for shutting off a pipe wall of a pipe filled with water, and is carried into the pipe in order to prevent the pipe from floating in a pipe from which water has been drained and replaced by air. The movable bulkhead device comprises a fixed bulkhead and a slide bulkhead, wherein the fixed bulkhead has a central tube having a predetermined length in a longitudinal direction, and a front and rear portion of the central tube. A disk-shaped first holding member concentrically fixed to both ends, and a packer provided so as to be inflatable outside the circumference of the holding member, wherein the slide bulkhead is attached to the center tube. A disk-shaped second holding member slidably provided, and a packer provided so as to be inflatable outside the circumference of the holding member, wherein the second holding member is a second holding member of the fixed bulkhead. 1
It is arranged between the holding members.

Further, according to the third aspect of the present invention, there is provided a movable partition wall device for shutting off a pipe wall of a pipe filled with water, and carrying the pipe into the pipe in which water is removed and replaced with air to prevent the pipe from floating. The weight device comprises a plurality of wheels and a pair of tracks of a predetermined length mounted on the wheels, and the newly installed weight device is a track of the existing weight device. The configuration is such that the wheels of the newly installed weight device move and are carried in.

[Operation] Since the movable bulkhead device of the present invention is configured as described above, in order to cut off and move the pipeline by this device, first, the fixed bulkhead is arranged at a predetermined position, and for example, air is removed. To expand the packer A. Then, the pipeline is blocked by the packers provided at both ends of the fixed bulkhead. Therefore, the water in one pipe is drained, and the water between the packers is also drained.

Since the slide bulkhead is provided so as to be slidable with respect to the central tube, the slide bulkhead is moved in the direction in which the partition wall device is moved, and the inside of the tube is similarly blocked by the slide bulkhead packer. Therefore, the diameter of the packer of the fixed bulkhead is reduced, and the fixed bulkhead is moved freely. Then it is expanded, cut off and drained. When draining, the slide bulkhead packer is reduced in size so that all water between the fixed bulkhead packers can be drained. Next, the packer of the slide bulkhead is moved again and inflated similarly. In the same manner as described above, the water in the pipeline is drained and replaced with air while sequentially moving the partition device like a scale.

Since the weight device is composed of a plurality of wheels and a pair of tracks of a predetermined length mounted on the wheels, the weight devices are sequentially laid by the movable partition device in accordance with the replacement with air. That is, for example, it is lowered from a vertical pipe or a rising pipe by a crane or the like, and is first installed in a horizontal pipe portion. At this time, since the pipeline has a circular cross section and a large central portion, the pipeline is carried through the central portion. Then, when installed, the legs attached to the wheels or the frame come into contact with the pipe side walls and are stabilized. The next weight device rolls on the track of the previously installed weight device and is carried in. And drop it on site. Then, it can be stably installed on the tube side wall as described above. In the same manner, the laying is performed in accordance with the progress of the movable partition device.

Examples Examples of the present invention will be described below. As shown in FIG. 1, a movable bulkhead device K for shutting off the inside of a pipe includes a fixed bulkhead 1 and a slide bulkhead 2.

The fixed bulkhead 1 has a center tube 50 of a predetermined length,
At both ends of this tube, two disk-shaped holding members 51, 51,.
・ Is fixed. A ring-shaped packer 52, for example, which can be expanded by air pressure, is provided around the circumference of the holding member.
Are provided. A drainage return pipe 6 is provided inside the central pipe 50, and two drainage pumps 4 are provided in the partition wall device K as shown in FIG. As shown in FIG. 1, the suction ports 5, 5 of the pump are located between the packers 52, 52 of the fixed bulkhead.
It faces between the packers at the left and right ends.

A weight device, which will be described later, together with the partition device K is wound and moved by, for example, a winch installed on a work table on the sea. For this purpose, a tow wire rope 60 is attached to the end of the partition wall device K, and the weight device tow wire rope 11 is also inserted therethrough. That is, the wire rope 11 movably penetrates the partition wall K through the wire block 7 in the bell mouth 8 in a movable manner. The weight device W is connected via a gripper 9 and a draw bar 10. Reference numeral 21 in FIG. 2 denotes a control panel, 22 denotes a hydraulic power unit, and 20 in FIG. 3 denotes a power cable.

As shown in FIGS. 4 to 7, the weight device W includes a bogie 70 and a pair of tracks 71, 71 having a predetermined length, as is well known in railway vehicles. That is, four wheels 72, 72... Are attached to the bogie saddle, and a pair of tracks 71, 71 are mounted on the bogies 70, 70.
Is provided. One end 73 of this track is tapered and the other end is formed in a recess 74. Note that the vehicle width of the wheels 72, 72 and the interval between the tracks 71 are the same, and the wheels roll on the tracks, as will be described in detail later. 4 to 6, reference numeral 75 denotes a weight mounting frame, and reference numeral 76 denotes a drawbar mounting bracket.

 Next, the operation of the above embodiment will be described.

As shown in FIG. 8, it is assumed that the pipeline P is laid between the land-side base G and the offshore workbench S, and is composed of a vertical portion or a rising portion and a horizontal portion. .

At the base G on the land side, a winch 76 for bogies and for removing weight devices is provided.
11 are wound. On the offshore work table S, a winch 77 for pulling the weight device W and a winch for pulling the bulkhead device K are provided.
78 are provided, and the ends of the ropes 11 and 60 are fixed to these winches, respectively.

First, the pipeline P is washed. Then, the drainage pump 79 is operated from the offshore workbench S to discharge the water in the rising pipe through the drainage pipe 80. Even if the water in the rising pipe is discharged, buoyancy does not act, so that there is no need to set a weight device at this time.

The bulkhead device K is lowered from the land side base G into the pipe. At this time, the wire ropes 11, 60 are passed through the pipeline P from the winches 77, 78 on the offshore workbench S, and the wire ropes 60 are fixed to the bulkhead device K, and the wire ropes 11 are shown in FIG. The end is wound around the winch 76 for removing the weight device through the partition device K as described above. .. Of the fixed bulkhead 1 are expanded to shut off the pipe.

Next, the pumps 4 and 4 are activated to drain the water in the portions A and B surrounded by the packer. After draining is completed, the slide bulkhead 2 is moved rightward in FIG. 1 and leftward in FIG. 8, and the packers 55 of the slide bulkhead are inflated to shut off the pipes. Next, the diameter of the packers 52, 52 of the fixed bulkhead 1 is reduced, and
Moves the fixed bulkhead 1. At this time, since the slide bulkhead 2 is slidably provided on the center tube 50 via the seal 54, water does not leak to the inside of the tube replaced with air, that is, rightward in FIG.

Next, the packers 52, 52 of the fixed bulkhead 1 are inflated to block the tubes, and the packers 55, 55 of the slide bulkhead are reduced. Then, the pumps 4 and 4 are started and the packers 52 and 52
The intervening water is drained, and the slide bulkhead 2 is moved in the same way and inflated at the same time. Hereinafter, water in the pipeline P is replaced with air while moving the partition device K like a scale in the same manner.

As the drainage and air replacement progress, it becomes necessary to carry in a weight device in order to prevent the pipe from rising. Therefore, an elbow bottom guide 81 is installed in the bend portion shown in FIG. This guide is composed of a pair of arc-shaped rails 82, 82 located substantially at the center of the tube, and a pair of guide members 83, 83.

Therefore, the weight device W is suspended from the base G on the land side. At this time, the wheels 72, 72 of the weight device W
The lifting is prevented by the guides 82 and 83 and guided to the bottom of the tube.

At the bottom, since the wire rope 11 drawn out from the winch 77 on the offshore workbench S is fixed to the weight device via the drawer 10, the wire rope 11 can be moved by winding the winch 77. That is, the wheels 72, 72 of the weight device to be carried on the tracks 71, 71 of the existing weight devices.
Rolls in and is carried in. Installation of the loaded weight device is performed as follows.

That is, as shown in FIGS. 1 and 2, the partitioning device K is provided with an undulating cylinder 18 via a weight setter mounting bracket 19, and the end of the roller conveyor 15 is provided at the tip of the cylinder. The part is pivoted. When the weight device W is carried in with the roller conveyor 15 raised as shown in FIG. 1, the bogie saddle 70 of the weight device is transferred to the rollers of the roller conveyor 15 and sent. When the transport position is reached, the undulating cylinder 18 is lowered. Then, the roller conveyor 15 is lowered. That is, as shown in FIG. 2, the roller conveyor reaches near the tube bottom. The weight device also descends, but since the width of the weight device is sufficiently larger than the width of the roller conveyor 15, the wheels 72, 72 of the weight device or the weight mounting frame 75 are set in contact with the wall near the bottom of the tube. This set state is indicated by W 'in FIG. Next, with the roller conveyor 15 in a low position, the roller conveyor is moved and pulled out. In addition, the existing weight device and the new weight device are fitted and matched with the tapered portion 73 and the concave portion 74 formed at the end of the track.

As described above, when all the pipelines P are replaced with air and the setting of the weight devices is completed, the trucks for the workers and the trucks for the equipment are also moved on the tracks of the weight devices, and the base G on the land side is moved. More repair equipment and workers enter the pipes to perform inspections and repairs.

After the inspection and repair are completed, fill with water in the reverse order of the above. That is, with the weight removing winch 76 set on the land side base, the weight is sequentially raised from the weight device at the tip. At this time, the packing of the partition device is expanded, contracted or moved, and water is injected during that time to prevent the pipeline from floating by buoyancy as described above.

[Effects of the Invention] As described above, according to the present invention, the inside of the pipe is cut off by the partition device of the movable partition device, drained, and the weight device is carried in, so that the air in the pipe does not rise due to buoyancy. Can be replaced by Therefore, an operator can bring various devices into the pipe replaced with the air, and check and repair can be directly performed.

According to the second aspect of the present invention, the bulkhead device is composed of a fixed bulkhead and a slide bulkhead, and the slide bulkhead is provided so as to be slidable with respect to the central tube. Yes, the partition device can be made compact.
Furthermore, in the invention according to claim 3, since the weight device is composed of a plurality of wheels and a pair of tracks, the loading and unloading of the weight device can use the previously laid weight device, and the weight device can be inserted into a narrow pipe. Can be easily loaded and removed. In addition, there is an advantage that the track of the weight device can be used as a rail of the work vehicle, and inspection and repair can be easily performed.

[Brief description of the drawings]

FIG. 1 is an axial cross-sectional view showing an embodiment of the movable partition wall device of the present invention, and FIGS. 2 and 3 are arrows A and B in FIG.
4 and 5 are an axial horizontal sectional view showing an embodiment of the weight device, and side sectional views, and FIGS. 6 and 7 are arrows C in FIG. FIG. 8 is a schematic perspective view showing the entire pipeline for explaining the operation of the present embodiment. K: movable bulkhead device, W: weight device, 1 ... fixed bulkhead, 2 ... slide bulkhead, 50 ...
Central tube, 52, 55 ... Packer, 71 ... Track, 72 ... Wheel

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 55/00-55/24 G01B 11/00-11/30 G01B 21/00-21/32 G01N 21/84-21 / 91 G01N 29/00-29/06

Claims (3)

(57) [Claims] 1. A step of shutting off a pipe wall of a pipe filled with water with a movable partition wall apparatus, a step of draining water in one pipe cut off by the step, and a step of draining water by the step. A weight installation step of loading a weight device for preventing the pipe from being lifted into the pipe replaced with air, and the above steps are repeatedly performed from the end of the pipe to replace the entire pipeline with air and float. A method for repairing a pipeline, comprising inspecting and repairing a pipe wall while preventing climbing. 2. A movable bulkhead device for blocking a pipe wall of a pipe filled with water, and a weight apparatus carried into the pipe in order to prevent the pipe from floating in a pipe from which water has been removed and replaced with air. The movable bulkhead device comprises a fixed bulkhead and a slide bulkhead, wherein the fixed bulkhead has a central tube having a predetermined length in the longitudinal direction, and concentric with both front and rear ends of the tube. A first holding member in the form of a disc fixed to the holding member, and a packer provided so as to be inflatable outside the circumference of the holding member. The slide bulkhead is slidably provided on the center tube. A disk-shaped second holding member, and a packer provided so as to be inflatable outside the circumference of the holding member, wherein the second holding member is provided between the first holding members of the fixed bulkhead. It is characterized by being arranged Repair device of pipeline. 3. A movable bulkhead device for shutting off a pipe wall of a pipe filled with water, and a weight apparatus carried into the pipe in order to prevent the pipe from floating in a pipe from which water has been removed and replaced with air. The weight device comprises a plurality of wheels and a pair of tracks of a predetermined length mounted on the wheels, and the newly installed weight device is newly installed on the track of the existing weight device. A pipeline repair device wherein wheels of a weight device move and are carried in.