JPH0730569B2 - Vertical shaft water sealing device for underwater propulsion method and underwater propulsion method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaching shaft water sealing device for underwater propulsion method and an underwater propulsion method.
It is a technology for laying pipelines used for sewers, electric wiring paths, underground walkways, underground carriageways, etc. on the bottom of water such as lake bottoms and river bottoms, and laying them while sequentially adding laying pipes such as standard length concrete pipes. In an underwater propulsion method in which the entire laying pipe row is propelled in water by applying propulsive force to the pipe row with a jack, etc., it is provided in the reaching shaft where the tip of the laying pipe row reaches The present invention relates to a water sealing device for preventing water from entering the water and a submersible propulsion method implemented by using such a reaching shaft water sealing device.

[0002]

2. Description of the Related Art Conventionally, in order to lay a row of pipes on the bottom of a lake or river, a carrier such as a ship is used to carry the laying pipe to a predetermined position on the water surface, where the laying pipe is submerged. It was placed on the bottom of the water, and then the worker dived into the water to connect the joints between the laid pipes. Such a construction method is called a so-called submersion method.

However, the underwater work required for such a submersion method requires a high level of skill, does not increase the work efficiency, and is highly dangerous, so that the construction efficiency of the whole construction method is lowered, There was a drawback that the construction cost was high. Therefore, it was considered to use the propulsion method developed as a construction method for underground pipes in the ground also for laying pipe rows in water as described above.

[0004] The propulsion method is usually to excavate a so-called starting vertical shaft from the surface of the earth to the ground, and to excavate the ground horizontally from the side wall of the starting vertical shaft to form an embedding hole, and to embed it in the embedding hole. Insert the pipe and apply propulsive force to the buried pipe with a push jack installed in the departure shaft to propel the buried pipe into the buried hole. Along with the promotion of the buried pipe, the buried pipes are successively added to the rear of the buried pipe, and the buried pipe row is buried in the ground. A series of construction steps are completed when the tip of the buried pipe row reaches the reaching vertical shaft installed at a place separated from the reaching vertical shaft by a predetermined distance.

If such a propulsion method is applied to the construction of a laying pipe underwater, the work of connecting the laying pipe underwater becomes unnecessary, and after the laying pipe is floated above the water surface and carried to the laying position, It also eliminates the need for troublesome transportation work such as submersion. Also, when constructing the pipeline both underground and underwater,
Can be shared by the same propulsion method. As a result, the construction efficiency is greatly improved, the work safety is improved, and the construction cost can be reduced.

[0006]

However, if the above-mentioned ordinary propulsion method is applied as it is to the construction of the laid pipe in water, water will enter the starting shaft and the reaching shaft, and There is a problem that work cannot be performed. At the starting shaft, connection work of laying pipes, sending work of laying pipe line, operation of original push jack, etc. are performed, and at the reaching vertical shaft, work of taking in the tip of laying pipe line and fixing work are performed. When doing the work of
When water enters, the work cannot be performed or the workability is greatly hindered.

Therefore, in order to apply the propulsion method to the construction of a laid pipe underwater, it is important to prevent water from entering the starting shaft and the reaching shaft. Each shaft requires a means for preventing water from entering, that is, a water sealing means. If both ends of the laying pipe row are hermetically sealed, it is possible to prevent water from entering the laying pipe row and prevent water from entering the shaft from the laying pipe row. However, it is necessary to sequentially propel the laying pipe row on the side wall of the starting shaft where the laying pipe line is fed into the water and on the side wall of the reaching shaft where the tip of the laying pipe line reaches from the water. Therefore, a gap is inevitably formed between the outer circumference of the laying pipe and the side wall, and water intrudes through this gap, which makes it difficult to prevent the intrusion of water.

If the starting shaft and the reaching shaft are provided in the ground on the land side where there is no water and the laying pipe row is buried from the ground through the water to the ground again, the side wall of each shaft is Since it does not come into contact with water, it is possible to prevent water from entering. But,
In this method, since the starting shaft and the reaching shaft must be provided on the land side far from the water's edge, the propulsion distance of one step becomes long and the construction becomes difficult. In addition, there is a concern that water may be transmitted through the gap between the outer circumference of the laid pipe row and the ground, and may enter the shafts.

As a method for preventing the intrusion of water in the starting shaft, the present inventor has previously filed a patent application, JP-A-52-1.
There is a method disclosed in Japanese Patent No. 30113. According to this method, a plurality of shell chambers are arranged side by side inside the side wall of the starting shaft, the laying pipe row is sequentially passed through the plurality of shell chambers, and then, is sent into the water from the side wall of the starting shaft. By draining each shell chamber with a pump, the water level is sequentially lowered from the shell chamber near the side wall to the inside shell chamber so that water does not enter the main body space side equipped with the original push jack and the like.
Each shell chamber and the side wall penetrations are blocked by the row of laying pipes that are propelled in sequence, so the amount of water entering the adjacent shell chambers is relatively small, and each shell chamber is drained by a pump. If this is done, it is difficult for water to penetrate into the main body space of the shaft.

However, this method can be applied to the starting shaft but not to the reaching shaft. That is, even if a plurality of shell chambers as described above are provided in the reaching shaft, the side wall and each shell chamber have through holes through which the laying pipe row passes until the tip of the laying pipe row arrives. . Therefore,
A large amount of water enters through this through hole, and even if the water is drained by a pump, the water level cannot be lowered.

Therefore, an object of the present invention is to provide a method of laying a row of pipes in water by using a propulsion method, and particularly, to easily, efficiently and safely perform the work at the stage of reaching the tip of the row of pipes to the reaching shaft. It is to provide a reachable shaft water sealing device for a submersible propulsion method that can be performed. Another object of the present invention is to provide a submersible propulsion method capable of laying a row of pipes in water simply, efficiently and safely by using this reaching shaft water sealing device.

[0012]

In order to solve the above-mentioned problems, a vertical shaft water sealing device for underwater propulsion method according to the present invention is provided.
In the underwater propulsion method in which propulsive force is applied to the laying pipe row to lay it in water, a water sealing device provided in the reaching vertical shaft of the laying pipe row, in which a plurality of isolation chambers equipped with drainage means The walls are divided by partition walls and are lined from the side wall that is the laying pipe arrival surface of the reaching shaft to the back side.At least the arriving pipe arrival point can be opened from the side wall of the laying pipe arrival surface, and each isolation The partition wall of the chamber is provided with an insertion hole that penetrates along the direction of propulsion of the laying pipe row and through which the laying pipe can slide, and a sliding stopper having an outer diameter corresponding to the outer diameter of the laying pipe is It is slidably inserted through the insertion hole of each partition wall.

As the laying pipe, a sewage system, an electric wiring line, an underground walkway, an underground roadway, or the like, which is made of any material or shape structure, can be used according to the purpose of use of the pipe line. For example, concrete pipes, steel pipes, FRP pipes, synthetic resin pipes, and composite pipes of these are used. The cross-sectional shape of the tube may be circular, oval, rectangular, rectangular, or any other irregular cross section.

The basic construction of the equipment and construction process used for the underwater propulsion method may be the same as that of the generally used underground propulsion method. Specifically, a starting shaft and a reaching shaft are constructed, and the laid pipe row formed is propelled into the ground or underwater while sequentially adding laying pipes from the side wall of the starting shaft. In order to propel the laid pipe row, a propulsion force is applied to the laid pipe row with a push jack installed in the starting shaft.

The laying pipes are propelled in a state where they are sequentially connected by bolt fastening, welding, bonding or other means. It is preferable that the connecting portion of the laying pipe has a watertight structure with packing or the like. If the pipe diameter is sufficient, it is possible to perform a watertight finishing operation while the laying pipe row is being propelled, or after the laying construction, an operator can enter the inside of the laying pipe row. If the front end and the rear end of the laid pipe row are sealed, it is possible to prevent water from entering the laid pipe row. Further, if the space in the laid pipe row is pressurized, the intrusion of water can be prevented more reliably. If a connecting tube extending from the water to the surface of the water is provided in the middle of the laying pipe, a worker can enter and leave from the connecting tube.

Various work devices such as a shovel and a bucket for removing obstacles such as earth and sand can be installed at the head of the laid pipe row. Using such means, the water bottom of the propulsion path of the laying pipe row,
By flattening the laying pipe row at a predetermined depth, the laying pipe row can be smoothly propelled, and the laying pipe row can be laid in an accurate depth position in a stable state.

The laying pipe may be laid in a state where a part or the whole is embedded in the water bottom. In this case, a means for excavating the ground at the bottom of the water or pushing away the earth and sand is provided. For the excavation means and the earth and sand removing means for that purpose, the technology of the prior conductor device employed in the conventional grounding method can be applied. If the ground at the bottom of the water is soft such as sand or mud, it may be possible to push the laying pipe row to push away the soil and bury it in the bottom of the water. If the laying pipe row is buried in the bottom of the water, the laying pipe row can be securely fixed, and the laying pipe row can be covered with earth and sand for protection.

When propelling the laid pipe row into water, it is necessary to prevent the laid pipe row from floating in water. For that purpose, the material and thickness of the laying pipe may be adjusted so that the weight of the laying pipe becomes heavier than the buoyancy received in water. In addition, the weight may be increased by injecting water into a part or the whole of the space inside the laid pipe.

According to the present invention, the reaching vertical shaft is installed in water or near the water's edge so that the side wall of the reaching vertical shaft faces the propelling direction of the laid pipe row. The concrete construction of the reaching shaft is carried out in the same way as the construction of the shaft in the ordinary propulsion method, and the earth retaining members such as sheet pile and sheet pile are driven side by side in the water or in the ground at the edge of the water, or a prefabricated cylinder. By embedding the body, a vertical cylindrical space is formed, and if necessary, the water accumulated inside is drained or the ground in the internal space is dug down.

The bottom surface of the reaching shaft is set according to the laying depth of the laid pipe row. Specifically, when the laid pipe row is laid on the bottom of the water, the bottom surface of the reaching shaft may be the bottom surface of the laid pipe row or slightly lower than that. When burying a part or the whole of the laid pipe row on the bottom of the water, the bottom of the reaching shaft should also be dug down accordingly. Of the side walls of the reaching shaft, the side walls facing the propulsion direction of the laying pipe row,
That is, the laying pipe reaching surface is designed so that at least the reaching portion of the laying pipe can be opened when necessary. Specifically, if a steel sheet pile or a concrete plate having a width corresponding to the diameter of the laying pipe is driven in such a degree that it can be pulled out, the steel sheet pile or the like can be pulled out to open the reaching portion of the laying pipe when necessary. This method is simple because no special member or structure is required. In addition, it is possible to fasten only the upper part by fastening the side wall members formed separately in the upper and lower sides with a bolt or the like and removing the bolt or the like. A through hole having a size corresponding to the outer diameter of the laying pipe may be opened in the side wall, and a removable lid may be attached to the through hole.

Within the reaching shaft, a plurality of isolation chambers are provided so as to be lined up sequentially from the arriving surface of the laid pipe to the inner side. Each of the isolation chambers is surrounded by a partition wall formed of a side wall of the reaching shaft and a steel plate to form an independent space, and adjacent isolation chambers are partitioned by a partition wall. Each isolation room is provided with a drainage means capable of discharging the water accumulated in the isolation room. As a concrete drainage means, various submersible pumps used in ordinary civil engineering works and underwater works, and above-ground type drainage pumps are used. For each isolation room,
A submersible pump may be installed inside the isolation room and the discharge pipe of the drainage may be drawn out to the outside, or the water intake port of the water absorption pipe of the drainage pump installed outside the isolation room may be installed in each isolation room. It may be inserted and arranged. It is not necessary to provide drainage means in the outermost isolation chamber adjacent to the side wall of the reaching shaft.

It is sufficient for the size of the isolation chamber to be such that a drainage pump or the like can be installed inside and a certain amount of water can be stored. As the number of isolation chambers increases, the water-sealing effect improves, but the number of members and drainage means forming the isolation chambers also increase. Therefore, the number of isolation chambers is set in consideration of these conditions. Specifically, it is necessary to provide at least two rooms, but under normal working conditions, about 3 to 6 rooms may be provided. The total length of a plurality of isolated rooms is set to the length of the part of the laid pipe row that is fed into the reaching shaft. In the propulsion method, only one laying pipe portion of the laying pipe row needs to be fed into the reaching shaft, so that the interval between the isolation chambers may be set according to the unit length of the laying pipe.

The partition wall of each isolation chamber is provided with an insertion hole which penetrates along the direction of propulsion of the laid pipe row and through which the laid pipe can slide. Specifically, a through hole having an inner diameter corresponding to the outer diameter of the laying pipe may be opened in the partition wall that partitions each isolation chamber and the partition wall that partitions the rearmost isolation chamber and the main body of the reaching shaft. The insertion hole allows the laying pipe row to easily pass and move as the laying pipe line is propelled, and between the outer periphery of the laying pipe,
It is preferable that the dimensional structure is such that there is no large gap that allows a large amount of water to enter. The shape of the insertion hole varies depending on the shape of the laying pipe, and a circular shape, a square shape, or any other shape can be adopted.

On the inner circumference of the insertion hole, a packing made of rubber or the like for sealing the outer circumference of the laying pipe or a seal structure can be provided. However, in the present invention, the insertion hole,
Even if a certain amount of water passes, it can be removed by the drainage means, so a strict sealing structure is not required. The sliding stopper is slidably inserted through the entire insertion hole as described above. As long as the sliding stopper has a certain degree of rigidity and strength, it is made of steel, concrete, FR
Materials made of various structural materials such as P molded bodies are used. The sliding stopper may be made of the same material as the laid pipe. The sliding plug body is a bottomed cylindrical body or a solid shaft body having an outer diameter corresponding to the outer diameter of the laid pipe. It is preferable that an end surface of the sliding stopper, which is arranged on the arriving pipe reaching surface side, can come into close contact with the tip of the laying pipe.
An engagement structure that engages with the tip end surface of the laying pipe to prevent mutual displacement may be provided. The length of the sliding stopper is preferably such that it can be inserted through all the insertion holes. Further, the depth of the reaching shaft on the main body space side must be set so that the sliding stopper can be completely pulled out from the insertion hole of each isolation chamber and taken out to the main body space side.

The underwater propulsion method according to the present invention, which is carried out by using the reaching shaft water sealing device having the above-mentioned structure, at the stage where the end of the laying pipe row is propelled to the reaching shaft, Open the side wall, advance the tip of the laying pipe row to the isolation chamber adjacent to the side wall, press the tip of the laying pipe row against the end face of the sliding stopper, drain each isolation chamber with drainage means, and lay the laying pipe row. To push the sliding plug at the tip of the laying pipe row, slide the sliding plug and the laying pipe row through the insertion holes of each partition wall, and move the laying pipe row to a predetermined length within the reaching vertical shaft. Send it up.

The structure of the starting shaft and the process of propulsively laying the laying pipe array from the starting shaft may be the same as the structure and process method adopted in the ordinary propulsion method, but the inside of the starting shaft or laying pipe line It is preferable to take measures to prevent water from entering the space. Specifically, the above-mentioned JP-A-5
The structure disclosed in JP-A-2-130113 is preferable.

In the reaching shaft, a structure such as an isolation chamber is installed in the internal space in a state where the side wall of the laying pipe reaching portion is closed. The tip of the laying pipe array is arranged concentrically with the center line of the insertion hole of each partition wall of the reaching shaft and the center line of the sliding stopper.
For that purpose, it is preferable to accurately measure the direction of propelling the laying pipe row from the starting shaft, the installation of the partition wall in the reaching shaft, the processing of the insertion hole, and the like to perform centering. In order to know the tip position of the laid pipe row and the propulsion direction, it is possible to mark the tip of the laid pipe row so that it projects above the water surface, or to measure the exact position by laser surveying. The insertion hole provided in the partition of the reaching shaft may be processed or adjusted in the reaching shaft according to the propelling direction of the laid pipe row that has been propelled.

When the tip of the laying pipe row is propelled to near the side wall of the reaching shaft, part of the sheet pile forming the side wall is pulled out to open the side wall of the laying pipe reaching point. Water enters the isolation chamber between the side wall and the next partition wall, but the insertion hole of the next partition wall is closed by the sliding stopper, so the first partition wall The ingress of water into the isolation chamber is prevented to some extent. Further, in the preceding isolation chamber as well, since the insertion hole of the partition wall is closed by the sliding stopper, the invasion of water is prevented to some extent.

In each of the isolation chambers beyond the next partition wall, drainage means such as a drainage pump is operated to discharge the intruding water. As a result, the water level of the water accumulated in the isolation chamber drops from the isolation chamber near the arriving surface of the laying pipe to the distant chamber, and almost no water enters the main space of the reaching shaft existing in front of the isolation chamber. When water enters the body space, a drainage means may be provided in the body space. In the body space,
Various work required for construction of the propulsion method can be performed without worrying about ingress of water.

When the tip of the laying pipe row is pressed against the end surface of the sliding plug body, the sliding plug body having the outer diameter corresponding to the laying pipe row and the laying pipe row are integrated into one shaft body. . When the laid pipe row is further propelled, the sliding plug is also pushed by the tip of the laid pipe row. The sliding plug sequentially slides through the insertion holes of each partition. At the same time as the sliding plug passes through one insertion hole,
Since the laying pipe row connected to the sliding stopper is inserted into this insertion hole, each insertion hole is always closed by the sliding stopper or the laying pipe row, and Penetration into the main space side of the preceding isolation chamber or reaching shaft is prevented through the insertion hole.

The laid pipe row passes through the insertion holes of each partition wall,
When it is sent to the vertical shaft for a predetermined length, it stops the laying pipe row. At this time, the sliding plug completely passes through the insertion hole of each partition wall and is pulled out toward the main body space side, and the insertion hole of each partition wall is blocked by only the laying pipe row. The pulled out sliding stopper can be repeatedly used in the final shaft to be constructed next.

Into each isolation chamber, underwater concrete is poured, or the gap between the insertion hole of the partition wall exposed to the main body space side and the laying pipe row is filled with a sealing material to fix the laying pipe row and to complete water Perform sealing work. If this water sealing work progresses, drainage means such as a drainage pump may be removed. The partition wall that constitutes each isolation chamber is used as it is as a support structure for supporting the laid pipe row.

After that, in the main body space of the reaching shaft, various operations such as appropriately processing the end surface of the laid pipe row and removing various equipment installed in the reaching shaft are performed. These post-operations are carried out in the same manner as in the ordinary propulsion method. It is also possible to use this reaching vertical shaft as a starting vertical shaft for propulsion laying a laying pipe row in the ground or in water from another side wall.

The underwater propulsion method of the present invention is not limited to the case where the laid pipe row is laid on the water bottom, and the case where the laid pipe row is partially or wholly embedded in the water bottom, and the pipe row is underground. Even when burying, the ground can contain a large amount of water, and it can be applied to a construction site having the same problem as described above, such as infiltration of water into the tube row and the shaft. That is, in the present invention, the term "underwater" is used to mean not only complete water but also underground containing a large amount of water.

[0035]

[Operation] If the laying pipe row is blocking the insertion hole of the partition that separates each isolation chamber, it prevents water from entering the isolation chamber at the back side or the main space of the reaching shaft through the insertion hole. can do. Furthermore, if each isolation chamber is provided with a drainage means, water that has entered the isolation chambers can be removed, so the water level is gradually lowered from the arrival surface side of the laid pipe row to the isolation chamber on the back side, and the main body It is possible to prevent almost no water from entering the space side.

As in the above-mentioned prior art, in the case of the starting shaft, the laying pipe row is sequentially sent out into the water while the insertion holes of the partition walls are closed by the laying pipe row from the beginning.
The insertion hole of each partition wall is always closed by the laying pipe row, and a sufficient water sealing effect can be achieved by the above method alone. However, in the reaching shaft, water enters the isolation chambers through the insertion holes before the laying pipe row closes the insertion holes of the partition walls, so that the method of the prior art described above cannot be applied as it is.

Therefore, according to the present invention, the sliding plug is inserted in advance through the insertion hole of each partition wall. Since the sliding plug has an outer diameter corresponding to the outer diameter of the laid pipe row, it can reliably block the insertion holes of the partition walls and prevent water from entering. In this state, if the side wall of the reaching shaft is opened, water will enter the outer isolation chamber, but the partition wall on the back side of the isolation chamber is blocked by the sliding stopper, and the isolation chamber ahead of the partition wall will be closed. Water is prevented from entering.

When the tip of the laying pipe row is brought into contact with the end surface of the sliding plug body and the laying pipe row is propelled and the sliding plug body is pushed toward the back side, the sliding plug body inserts the insertion holes of each partition wall. Pass through one by one,
Instead of being pushed out to the main body space side, the laid pipe row is sequentially inserted into the insertion holes of each partition wall. That is, the insertion hole of each partition wall is always closed by either the sliding plug body or the laid pipe row.

Until the laying pipe row is fed to the reaching shaft by a predetermined length, intrusion of water from the insertion hole of each partition wall is satisfactorily blocked by the sliding plug or the laying pipe row, so that the main space of the reaching shaft is reached. There is no need to worry that water will get in and will interfere with various operations. In this invention, compared to the above-mentioned prior art, no special device or structural member is used other than the use of the sliding stopper, and the sliding stopper is actuated without changing the propulsive force of the laid pipe row. Since it is only used, no special operation or difficult work is required.

[0040]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the work process in the reaching shaft in stages. As shown in FIG. 1, a laying pipe 20 made of a concrete pipe or the like is laid on the ground E at the bottom of the lake water or the river water W. The laying pipes 20 are sequentially connected to the rear, and although not shown, the rear end is housed in the starting shaft and is propelled from the left to the right in the figure by the propulsive force applied from the original push jack or the like.
The tip of the laying pipe 20 is closed by a lid 22,
Water is prevented from entering the inside of the.

The reaching shaft 10 constitutes a vertical space surrounded by side walls 32 and 33 made of steel sheet pile, that is, earth retaining walls. One side wall 32 of the reaching shaft 10 faces the water W, and this side wall 32 serves as a laying pipe reaching surface that the laying pipe 20 reaches. The side wall 32 of the laying pipe reaching surface is driven to such an extent that it can be pulled out. Remaining sidewall 33
Is constructed facing the ground E. This side wall 33 is
It does not have to be removable. In this embodiment, the reaching shaft 10 is provided at the boundary between the water W and the land. The bottom of the reaching shaft 10 is dug a little deeper than the bottom of the water W side. This is because it is easy to handle the laying pipe 20 and the like in the reaching shaft 10.

Partition walls 34 to 37 are provided at regular intervals from the side wall 32 of the laying pipe reaching surface to the rear side.
Between 37 and 37 are independent isolation rooms S _{1 to} S ₄ . The inner side of each of the isolation chambers S _{1 to} S ₄ serves as a main body space S ₀ of the reaching shaft 10, on which various equipments are installed and workers enter and perform work. Each isolated chamber S ₂ to S _4, except the isolated chamber S ₁ adjacent to the side walls 32 are respectively installed underwater pump 50 ..., each isolated chamber S ₂
The water collected in ~ S ₄ can be discharged to the outside.

Each of the partition walls 34 to 37 has the side walls 32 and 33.
It is composed of steel sheet pile, etc. Insertion holes 38 ... Are formed through the lower portions of the partition walls 34 to 37. The insertion holes 38 are set so that their centers are arranged on the extension lines of the laying pipe 20 in the propelling direction.
The inner diameter of the insertion holes 38 ... Is set to be approximately the same as the outer diameter of the laying pipe 20. A seal portion 39 made of packing or the like is provided on the inner edges of the insertion holes 38. The seal portion 39 abuts on the outer diameter of the laying pipe 20 or a sliding plug body to be described later to prevent a gap therebetween, prevent water from entering, and allow the laying pipe 20 and the like to slide smoothly. ing.

A cylindrical bottomed sliding stopper 40 having the same outer diameter as the laying pipe 20 and one end surface 42 closed is inserted through the insertion holes 38 of the partition walls 34 to 37. The closed end surface 42 of the sliding stopper 40 is arranged immediately inside the side wall 32, and the opposite end portion thereof slightly protrudes into the interior of the partition wall 37. A process of reaching the 20 rows of laid pipes to the reaching shaft 10 having the above structure will be described.

As shown in FIGS. 1 and 2, when the tip of the laying pipe 20 is propelled to just outside the side wall 32, the side wall 32 is pulled out upward. Then, the water W freely enters the inside of the isolation chamber S ₁ . Since the insertion hole 38 of the partition wall 34 arranged in the back of the isolation chamber S ₁ is closed by the sliding plug 40, the water W cannot freely pass through the insertion hole 38. However, since the insertion hole 38 and the sliding stopper 40 are not completely water-sealed, it is impossible to prevent a certain amount of water W from entering the inner side of the isolation chamber S ₂ through the gap. This means that the partition wall 35 for partitioning the isolation chamber S ₂ and the isolation chamber S ₃ and the partition wall ₃ for partitioning the isolation chamber S ₃ and the isolation chamber S _4.
6, and the partition wall 3 that separates the isolation chamber S ₄ from the main body space S ₀
The same applies to 7.

Each isolation room S₂~ S_FourWater W collected in
Exclude to the outside with the medium pump 50 .... This submersible pump 50
Through the drainage amount and the insertion holes 38 of the partition walls 34 to 37.
Each isolation room S in a state where the amount of water entering₂~ S
_FourThe water level of is decided. As a result, isolation room S₂Outside the sky
Water level L₀A little lower than water level L₁Water W collects
The isolation room S on the back side₃, S_FourIn front of the isolation room
S₂, S₃Lower water level L ₂, L₃Water W collects at
Becomes Body space S₀Most of the water W has infiltrated
Not in. As long as the submersible pump 50 is operating,
Water level L₁~ L₃Is maintained. Each isolation room S₂~ S_FourAnd
And body space S₀Had a spare submersible pump
By using a submersible pump 50 with a high maximum drainage capacity,
Even if some submersible pumps 50 ...
be able to.

The laying pipe 20 is propelled so that the tip of the laying pipe 20 is brought into contact with the end surface 42 of the sliding stopper 40. Since the laying pipe 20 and the sliding plug 40 have the same outer diameter, the both are integrated to form one shaft body. If the 20 rows of the laying pipes are still propelled, the laying pipes 20 will push the sliding plug 40 toward the inner side. As shown in FIGS. 2 and 3, when the row of laying pipes 20 is propelled, the sliding plug body 40 is pushed toward the inner side, and the sliding plug body 40 is pushed out from the insertion hole 38 of the partition wall 34. However, at the same time when the sliding plug 40 is pushed out,
Since the laying pipe 20 connected to the rear is inserted into the insertion hole 38 of the partition wall 34, there is no large gap in the insertion hole 38 of the partition wall 34, and the laying pipe 20 penetrates into the inner isolation chamber S ₂ through the partition wall 34. The amount of water W does not change. Therefore,
The water levels L _{1 to} L _{3 in the} isolation rooms S _{2 to} S ₄ do not change.

In this way, if the laying pipe 20 is continuously propelled, the sliding plug 40 is inserted into the insertion holes 38 of the partitions 34 to 37.
Are sequentially pushed out, and instead of the sliding plug 40, the laying pipe 20 closes the insertion holes 38 of the partition walls 34 to 37. As shown in FIG. 4, the sliding plug 40 is completely pushed out into the main body space S ₀ , and the laying pipe 20 has all the partitions 34 to 37.
When the insertion hole 38 ... Is closed, the laying pipe 20 is stopped from being propelled. The sliding plug 40 may be pulled up from the reaching shaft 10.

Next, underwater concrete is poured into each of the isolation chambers S _{2 to} S ₄ to fill the gap between the insertion holes 38 of the partition walls 34 to 37 and the laying pipe 20. At this time, the submersible pumps 50 ... Are avoided in a place where they are not embedded in concrete, and after the gap between the laying pipe 20 and the insertion holes 38 ... ₂ ~ S
Pull out from ₄ and collect. The laying pipe 20 is fixed while being supported by the plurality of partition walls 34 to 37. Therefore, the partition walls 34 to 37 are also used as a support structure for the laying pipe 20.

After that, the lid 22 on the end surface of the laying pipe 20 is removed, and the same work is performed on the side of the starting shaft to fix the laying pipe line, so that the 20 lines of laying pipe between the starting shaft and the reaching shaft 10 are fixed. Construction is complete. In the reaching shaft 10 and the starting shaft, finishing work is performed on the ends of the laid pipe 20, the side walls, and the like, if necessary. Arrival shaft 10
Can be used as a starting shaft in the next propulsion step, and in that case, a source push jack and a carrying-in device for the laying pipe 20 are installed in the reaching shaft 10.

Next, various device structures for the underwater propulsion method which can be used in combination with the reaching shaft water sealing device according to the present invention will be described. In the embodiment shown in FIG. 5, a work boom 202 projecting forward is provided at the head of the laid pipe 200. A roller device 206 for leveling the ground and a bucket device 204 for removing unnecessary soil are attached to the work boom 202. A lighting device 208 that illuminates the front is provided near the base of the work boom 202.
If an infrared lamp is used as the illuminator 208 and is monitored by an infrared monitor, the front of the laying pipe 200 can be clearly confirmed even if the water is cloudy. An operation panel 210 for operating each device of the work boom 202 is provided inside the leading portion of the laying pipe 200. An operator enters the inside of the laying pipe 200 and observes the state of the water bottom in front through the transparent window 222 provided on the front end surface of the laying pipe 200, and if necessary, ground leveling and removal of earth and sand are performed.

By using such a device, the underwater propulsion method can be efficiently carried out even if the bottom of the water is uneven or there is an obstacle, without hindering the propulsion of the laying pipe 200. It should be noted that devices such as the work boom 202 can be removed when the laying pipe 200 reaches the vicinity of the reaching shaft 10 so as not to interfere with the work at the reaching shaft 10.

In the embodiment shown in FIG. 6, a connecting cylinder 232 extending to the water surface is provided in the middle of the laying pipe 230. An elevating staircase 234 is attached to the connecting cylinder 232 so that an operator can enter and exit from the middle of the laying pipe 230. If the laying pipe 230 during the propulsion construction can be moved in and out, an operator can enter the laying pipe 230 to perform finishing work and inspection work. Although it is possible to go in and out from the end of the laying pipe 230 at the starting shaft, it is convenient to allow the laying pipe 230 to come in and go out midway when the length of the laying pipe 230 becomes long. It can also be used as an escape port or rescue port for workers in an emergency. This connection tube 232 is a laid pipe 230 after the construction is completed.
It may be removed by closing the connecting part with and, or may be left as an inspection port after construction.

The embodiment shown in FIG. 7 is common to the embodiment shown in FIG. 5 in that the work boom 246 and the bucket device 248 for removing soil are attached to the head of the laying pipe 240. A transparent window 244 is provided on the front end surface 242 of the laying pipe 240 so that it can be operated from inside the laying pipe 240. Further, in this embodiment, a U-shaped guide frame 250 having an open top is provided at the tip of the laying pipe 240 having a rectangular shape.
Is attached so that it can move forward and backward. This guide frame 25
0 is projected to the ground E in front of the laying pipe 240, and the earth and sand that have entered the inside of the guide frame 250 are removed by the bucket device 248.
If it is taken out and removed by (1), a groove having an appropriate shape is formed along the outer shape of the guide frame 250. Laying pipe 2 along this groove
If 40 is propelled, the laying pipe 240 can be smoothly propelled, and the propelling direction of the laying pipe 240 can be accurately set. If the forward and backward movement of the guide frame 250 and the propulsion of the laying pipe 240 are alternately repeated, the above work can be efficiently performed. Even if the guide frame 250 remains fixed to the head of the laying pipe 240, some effects can be achieved.

[0055]

As described above, according to the reaching shaft water sealing device for the underwater propulsion method and the underwater propulsion method according to the present invention, as described above, the laying is performed in the insertion hole of the partition wall partitioning the plurality of isolation chambers. By inserting a sliding plug that has an outer diameter corresponding to the outer diameter of the pipe, from the stage where the laying pipe row reaches the side wall of the reaching shaft, It is possible to reliably prevent the intrusion of water into the main body space of the reaching vertical shaft by closing the insertion hole with either the sliding plug body or the laying pipe row until the insertion shaft is fed.

As a result, it is possible to reliably and easily obtain a good water-sealed state in the reaching shaft, which was difficult with the conventional propulsion method, and the propulsion method is favorably applied to the laying work of the pipe row in water. It will be possible. The propulsion method is far safer and more efficient than the conventional submersion method, so it becomes possible to carry out the construction of pipe rows in water with good workability and safety. It can greatly contribute to the development of the technology for laying pipe rows and the expansion of applications.

Further, according to the present invention, the reaching shaft can be maintained in a reliable water-sealed state only by adding sliding plugs to the plurality of isolation chambers and the drainage means. It is easy, the facility cost and work cost are low, and it is excellent in economic efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing a construction method as an embodiment of the present invention stepwise for a reaching shaft portion, of which a first step is shown.

FIG. 2 is a sectional view of a second stage of the above.

FIG. 3 is a sectional view of a third stage of the same as above.

FIG. 4 is a sectional view of a fourth stage of the same as above.

FIG. 5 is a partial cross-sectional view showing a tip portion of a laid pipe row in another embodiment.

FIG. 6 is a cross-sectional view showing an intermediate portion of a laid pipe row in another embodiment.

FIG. 7 is a perspective view showing a tip portion of a laid pipe row in another embodiment.

[Explanation of symbols] 10 Vertical shaft 20 Laying pipe 32 Extraction side wall 34 to 37 Partition partition wall 38 Insertion hole 39 Sealing material 40 Sliding plug body 50 Drain pump E Ground L _{0 to} L ₃ Water level S ₀ Main body space S _{1 to} S ₄ Isolation room W water

Claims (2)

[Claims] 1. In a submersible propulsion method in which a propulsive force is applied to a laid pipe row to lay it underwater, the water sealing device is provided in a reaching shaft of the laid pipe row, and a plurality of isolations equipped with drainage means are provided. The chambers are separated from each other by partition walls and are lined from the side wall that is the laying pipe arrival surface of the reaching shaft to the back side, and at least the arriving position of the laying pipe can be opened on the side wall of the laying pipe arrival surface. The partition wall of each isolation chamber is provided with an insertion hole that penetrates along the direction of propulsion of the laying pipe row and allows the laying pipe to slide through, and has a sliding diameter that corresponds to the outer diameter of the laying pipe. The reaching shaft water sealing device for a submersible propulsion method, wherein the stopper is slidably inserted through the insertion holes of the respective partition walls. 2. The underwater propulsion method using the reaching vertical shaft water sealing device according to claim 1, wherein when the tip of the laying pipe row is propelled to the reaching vertical shaft, the side wall of the laying pipe reaching point is opened, and the laying pipe row is opened. The tip of the laying pipe row to the isolation chamber adjacent to the side wall, press the tip of the laying pipe row against the end surface of the sliding stopper, and drain each isolation chamber by the draining means while propelling the laying pipe row. Characterized in that the sliding plug is pushed forward at the tip of the slide, the sliding plug and the laying pipe row are slidably passed through the insertion holes of each partition wall, and the laying pipe row is fed to the reaching vertical shaft to a predetermined length. Propulsion method.