JP2007146542A - Connecting structure of excavating machine and method of in-water recovery of excavating machine - Google Patents

Connecting structure of excavating machine and method of in-water recovery of excavating machine Download PDF

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JP2007146542A
JP2007146542A JP2005344079A JP2005344079A JP2007146542A JP 2007146542 A JP2007146542 A JP 2007146542A JP 2005344079 A JP2005344079 A JP 2005344079A JP 2005344079 A JP2005344079 A JP 2005344079A JP 2007146542 A JP2007146542 A JP 2007146542A
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excavator
buried pipe
watertight
fitting
water
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JP2005344079A
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JP4139405B2 (en
Inventor
Daisuke Araki
Michio Okamura
道夫 岡村
大介 荒木
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Kidoh Construction Co Ltd
機動建設工業株式会社
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Abstract

An excavating machine propelled from the ground to the water can be recovered safely and efficiently, and the recovered excavating machine can be reused easily and quickly.
SOLUTION: Connection structures 30 and 40 of an excavating machine 10 propelled from underground E to underwater S and a row of buried pipes 20 are provided. Water-sealing for sealing the fitting / disconnecting portions 34, 44 and the fitting / detaching-connecting portions 34, 44 in a watertight state to connect the rear end side of the excavator 10 and the front end side of the buried pipe 20 row so as to be freely fitted and detached in the axial direction. Water-tight partition walls 31 and 41 disposed at the stop 46, the rear part of the excavator 10, and the front part of the row of buried pipes 20, and the openable passages are closed by the watertight doors 32 and 42, and the rear part of the excavator 10 Alternatively, a cylinder device or the like that is disposed in the front portion of the buried tube 20 row and pushes the opposing buried tube 20 row or the excavator 10 in the axial direction to release the connection of the fitting / disconnecting portions 34 and 44. A dedrive unit 60 is provided.
[Selection] Figure 7

Description

  The present invention relates to an excavator connection structure and an underwater recovery method for an excavator, and more particularly, a method for recovering an underwater excavator that digs into the water from the ground and lays a buried pipe row in the back. It is intended for a connecting structure in which an excavator used in a simple method is connected to a buried pipe line.

The propulsion method of constructing pipelines underground using excavators is widely used for construction of sewers and gas pipes.
In a general propulsion method, shafts are constructed from the surface to the ground at both ends of the construction section. The excavator is propelled to the ground from the side of the starting shaft. A buried pipe line connected to the rear of the excavator is laid in the ground. The excavator that has reached the reach shaft is recovered from the reach shaft to the ground.
Apart from this, the end of the pipeline constructed in the ground may be opened in water such as the sea or river. For example, an intake pipe or a drain pipe of a power plant may be opened from the underground of the power plant to the water below the sea level through the coast.

In order to apply the propulsion method described above to the construction of a pipeline constructed underwater from the ground, the excavator must be collected underwater.
In Patent Document 1, an excavating machine propelled in the ground below the seabed and laying a buried pipe line was constructed by digging the seabed with a concrete wall or the like, and propelled to a reach shaft where seawater was introduced inside Furthermore, a technique is shown in which a cutting pipe disposed at the rear end of the excavator is cut and separated from the rear buried pipe row, and the excavator is lifted from the sea to the sea level and collected.
In Patent Document 2, as a method for recovering the shield machine in water, the shield frame is extended and formed, a double partition is built inside and behind it, and the shield frame is cut between the front and back partitions, A technique for recovering a shield machine partitioned by a front bulkhead is shown. The shield frame is slidably overlapped with a double cylinder structure, and after building the front and rear partition walls, the front frame body of the shield frame is pulled out and separated from the rear cylinder body. Techniques for recovering the shield machine including are shown.
JP 2002-180779 A JP 2005-126991 A

In the technique for recovering the excavator from the water in the prior art, there is a problem that the work in the water is difficult and troublesome.
In the technique of Patent Document 1, the work of cutting the cutting pipe at the rear end of the excavator in the underwater shaft is to cut the steel plate material constituting the cutting pipe with an underwater cutting apparatus or with a disk cutter. Will do. Such underwater cutting work is difficult unless it is a skilled worker with diving equipment. Even skilled workers can be quite troublesome and time consuming. In particular, diving work in deep seas is limited in work time from the viewpoint of worker health and safety. If the cutting operation is not completed in one diving operation, it is necessary to repeat the diving operation after a certain period of time or to perform the operation while the diving operator changes. The work efficiency is poor, the work period is long, and the work cost is high.

Moreover, the excavator with a part of the cut cutting pipe connected cannot be used for the next propulsion method as it is. The cut cutting tube must be removed and a new cutting tube connected to the rear of the machine.
Even when the shield frame is cut by the technique of Patent Document 2, there is the same problem as described above. When using a double-cylinder shield frame, it is not necessary to cut underwater, but the construction of a pair of front and rear partitions inside the shield frame, or the front cylinder of the shield frame from the rear cylinder Complicated and time-consuming work such as setting up a pulling out jack is necessary. Compared to the case of performing the cutting operation, the workability is worse and the cost is higher. After the excavator and shield frame are recovered from the water, the bulkhead built in the shield frame must be cut or removed by means such as fusing, so it cannot be used for the next shield excavation, which takes time. become.

  An object of the present invention is to make it possible to safely and efficiently recover an excavator propelled from the ground into the water and to easily and quickly reuse the recovered excavator. .

The connection structure of the excavator according to the present invention is a connection structure of an excavator that is propelled from the ground into the water and a buried pipe line that is connected to the rear of the excavator, and the rear end side of the excavator and the A fitting / disconnecting part for connecting the front end side of the buried pipe row in an axially detachable manner, a watertight sealing part for sealing the fitting / disconnecting part in a watertight state, a rear part of the excavator and the buried pipe A watertight partition wall which is arranged at the front part of the row and whose openable opening is closed by a watertight door, and a burying on the opposite side which is arranged at the rear part of the excavator or at the front part of the buried pipe line An engagement / disengagement drive unit that pushes the tube row or the excavator in the axial direction to release the connection of the engagement / disengagement unit;
Each configuration will be described in detail.

[Built pipe]
Buried pipes used for normal pipe construction can be used. The material and dimensional structure are set according to the purpose and required performance of the pipeline to be constructed.
Specific examples include a fume pipe, a concrete pipe, a steel pipe, an FRP pipe, a ceramic pipe, and a synthetic resin pipe. A composite tube in which a plurality of material layers are laminated is also used. It is effective to use a water-resistant or seawater-resistant material or a buried pipe that has been subjected to a water-resistant treatment and a corrosion-resistant treatment in a portion of the buried pipe row that is exposed to water.
The dimensions of the buried pipe are set according to the purpose and required performance of the pipeline to be constructed. Usually, the diameter of the buried pipe can be set to a range of 800 to 3000 mm and a length of 1.0 to 5.0 m.

The connection between the buried pipes is usually performed by fitting the ends between the front and rear buried pipes. Therefore, a step for fitting and a concavo-convex structure are provided at the end of the buried pipe. In some cases, the buried pipes are fitted and connected with a sleeve pipe in between. In some cases, the embedded pipes are connected via a connecting tool that connects the embedded pipes so that they can be bent within a certain range. When the connection location between the buried pipes is exposed in water, the connection location is made watertight. Also in this case, the sealing material and packing material which are employ | adopted also in normal buried pipe connection can be used.
About the underground pipe connected with an excavation machine, the specific connection structure mentioned later is provided. A connecting structure can be processed at the tip of the buried pipe, or an attachment structure for the connecting structure can be added. The buried pipe itself can be the same as a normal buried pipe, and a connecting device can be attached to the tip of the buried pipe.

[Digging machine]
Among excavators used for ordinary pipeline construction, those having a structure that can be reused after being propelled into water and collected are used.
Ordinary excavators often have a water-tight structure or a water-resistant structure that can withstand leachate and groundwater pressure in the ground, so there is no particular problem even when propelled in water. It is more preferable if it is excellent in the corrosion resistance to seawater and the pressure-resistant water resistance at a depth in water.
The excavator has a cylindrical shape corresponding to the diameter of the pipeline to be constructed. The front end is equipped with a drilling mechanism such as a rotary excavator that digs the ground. A muddy water supply mechanism that supplies muddy water to the ground to be excavated, a consolidation mechanism that consolidates the ground, a soil discharge mechanism that collects excavated soil water, and the like can also be provided. A turning mechanism that changes the propulsion direction of the excavator may be provided. Inside the excavator, a surveying device for measuring the position of the excavator, and wire pipes such as an energy supply wiring cable and a piping tube for supplying electric power, hydraulic pressure and the like to the excavation mechanism are also accommodated. A control cable and an information communication line for performing operation control of each operation mechanism and detecting an operation state are also arranged.

The dimensions of the excavator are set according to the construction conditions such as the diameter of the buried pipe to be laid and the propulsion distance. Usually, the outer diameter is the same as the diameter of the buried pipe, and the length can be set in the range of 2.0 to 7.0 m.
[Connecting structure]
The excavator is connected to the buried pipe line arranged behind it.
For the connection structure, a connection device that is separate from the excavator and the buried pipe can be used, or the structure of the excavator or the buried pipe can be used as a part of the connection device.
(Fitting / disconnecting part)
The rear end side of the excavator is connected to the front end side of the buried pipe row so as to be freely fitted and removed in the axial direction.

In ordinary civil engineering structures and mechanical structures, means, mechanisms, and structures that fulfill the function of fitting and connecting shaft-like or cylindrical members to each other and releasing the connection to separate the members can be applied.
Specifically, if a difference in outer diameter is provided between the rear end side of the excavator having any cylindrical shape and the front end side of the buried pipe row, the outer diameter side, i.e. It can fit together so that it may overlap with the small side, ie, the outer periphery of an inner cylinder part. Since the basic outer diameter of the excavator and the buried pipe row is set to the same diameter, on the side that becomes the inner cylinder part, a step is provided near the end part, and the inner cylinder that has a smaller outer diameter by a predetermined length. You just have to be a part. The length of the stepped portion having the reduced outer diameter becomes the length of the inner cylinder portion, and substantially corresponds to the fitting length between the outer cylinder portion and the inner cylinder portion.

By providing a certain gap between the inner peripheral diameter of the outer cylindrical portion and the outer peripheral diameter of the inner cylindrical portion, a smooth fitting / connecting operation and connection releasing operation are possible. The length of the fitting / removing connecting portion is set to such a degree that sufficient connection and integration can be achieved in the connected state, the function of the watertight sealing portion can be sufficiently exhibited, and the connection can be easily released. Specifically, it can be set to a length of 100 to 200 cm.
Any side of the rear end side of the excavator and the front end side of the buried pipe row may be an outer cylinder part and an inner cylinder part of the fitting / disconnecting part. In order to prevent dripping at the time of propulsion, it is effective to set the front end side of the buried pipe row to the inner cylinder part and the rear end side of the excavator to the outer cylinder part.

When the excavator or the buried pipe row itself is used as a part of the connecting device, either the outer cylinder part or the inner cylinder part can be constituted by the end of the excavator or the buried pipe itself.
(Watertight seal)
The excavator side and the buried pipe row side of the fitting / removing connecting portions fitted and detached from each other are sealed in a watertight state.
A watertight sealing structure adopted in a fitting part or sliding part in a normal civil engineering machine, apparatus, or device can be applied.
Specifically, a sliding packing, a brush-like sealing member, or the like can be used. A slidable sealing tool or sealing packing which is employed at a joint where the buried pipes can be bent in a normal propulsion method or the like can be used. After the excavator is separated from the buried pipe row, the structure of the watertight sealing portion is exposed in water. Therefore, it is desirable to employ a material and structure excellent in water resistance and seawater resistance.

If the sealing member which comprises a watertight sealing part is slidable with respect to the other party in a fitting / detaching connection part, you may be provided in any side of the excavator side and the buried pipe side. Sealing members can also be provided on both sides. If the sealing member or the watertight sealing portion is provided in the axial direction of the fitting / disconnecting portion in double or triple layers, the watertight sealing function becomes higher.
(Watertight bulkhead)
Arranged at the rear of the excavator and at the front of the buried pipe row. Isolate the space before and after the watertight bulkhead in a watertight state.
Materials and structures common to watertight partitions in normal underwater equipment, devices and equipment used in water can be adopted. For example, a material excellent in mechanical strength and pressure resistance such as a steel plate is used. It is effective to improve pressure resistance by combining a steel plate with a reinforcing rib or a reinforcing frame. Materials other than metal, such as FRP resin, can also be used.

The watertight bulkhead is provided with an opening that can be passed back and forth, and by providing a watertight door that can be opened and closed freely, the front and rear spaces are securely separated from each other and the state in which they can freely go back and forth. Can be selectively set as necessary.
The watertight door is made of a water-resistant and pressure-resistant material and structure in the same manner as the watertight partition wall. It is desirable to arrange a watertight sealing packing or the like at the contact point between the watertight door and the watertight partition. The watertight door can be easily opened and closed if it is attached to the watertight partition wall by a hinge mechanism or the like so as to be freely opened and closed. Moreover, it is detachable from the watertight partition wall, and it is only necessary to switch between the state attached to the watertight partition wall and the state detached from the watertight partition wall. For example, if it is the structure which bolts to a watertight partition with the fastening bolt arrange | positioned along the outer periphery of a watertight door, attachment or detachment will be attained by operation of a bolt.

In the watertight partition wall, in addition to the opening for arranging the watertight door, a through space through which wire tubes such as cables, pipes and wirings can be provided in the front and rear spaces. These penetrating spaces have a watertight structure between the outer shape of the tube and the inner shape of the penetrating space in a state where the tube is inserted and arranged. In addition, when a line tube is not inserted into the through space, it is desirable that a watertight lid for closing the through space is attached.
The watertight partition may be provided directly on the excavator or the buried pipe, or may be provided on a connecting device installed on the excavator or the buried pipe. The watertight bulkhead can be structured so that it can be attached to and detached from the excavator, the buried pipe or the connecting device. In this case, it can be considered that the watertight partition itself is a watertight door. Before separating the excavator and the buried pipe line, which requires a watertight bulkhead, attach the watertight bulkhead, separate the excavator from the buried pipe line, and when the construction of the pipeline is completed, the watertight bulkhead from the buried pipe line is completed. Can be removed. If the watertight partition is removed, the opening of the pipeline after construction becomes wide, and the flow resistance of the pipeline is reduced. By leaving the watertight partition wall, it is possible to increase the structural strength at the distal end portion of the pipe line, or to use it to attach a fence or a filter that prevents passage of foreign matter.

(Fitting / removal drive part)
It fulfills the function of releasing the connection of the fitting / removing connecting portion. It is arranged either at the rear of the excavator or at the front of the buried pipe line. The mating pipe line or the excavating machine on the opposite side is pushed in the axial direction to release the connection of the fitting / disconnecting part.
Since the fitting / removing part has a structure that is fitted and connected in the axial direction and is released from the connection in the axial direction, the fitting / removing drive part may be provided with a mechanism or device structure that can act on the axial direction. .
Specifically, a piston cylinder mechanism, a toggle mechanism, a cam rack mechanism, a ball screw mechanism, a link mechanism, a linear actuator mechanism, and the like can be used. As a driving source for operating these mechanisms, pressure such as hydraulic pressure, pneumatic pressure, water pressure, and vapor pressure, an electric motor, electromagnetic force, and the like are employed.

  The fitting / disengaging drive part may be provided in at least two places in the circumferential direction at both ends of the diameter with respect to the fitting / disengaging connection part existing along the circumferential direction of the excavator or the buried pipe row. By disposing the engagement / disengagement drive portions at three or more locations in the circumferential direction, the engagement / disengagement operation of the engagement / disengagement connecting portion can be ensured. The arrangement of the engagement / disengagement drive unit may be equally spaced in the circumferential direction, or arranged at non-equal intervals in order to avoid interference with members and equipment disposed in the excavator or the buried pipe row There is also. The number of installation / removal drive units depends on the diameter of the excavator and the buried pipe row, the relationship between the drive force required for driving the connection / disconnection unit and the drive force that can be generated by one engagement / disengagement drive unit, and driving in the circumferential direction. It can be set considering the equalization of power. Usually, the engagement / disengagement drive part should just be arrange | positioned in 4-10 places of the circumferential direction.

As a specific example of the fitting / removal drive unit, a cylinder device arranged at a plurality of locations in the circumferential direction with respect to either the excavator or the buried pipe row, and a counterpart that is arranged in the cylinder device and can move forward and backward in the axial direction. It is possible to employ one having an actuating shaft that pushes with the tip being brought into contact with the side excavator or the buried pipe row. Also, the internal thread portion supported by either the excavator or the buried pipe row and the axial movement by being screwed into the female thread portion and rotating, and the tip end of the opposite buried pipe row or the excavator It is also possible to employ a jack screw device having a male screw shaft with which the abutment is disposed and arranged at a plurality of locations in the circumferential direction.
[Coupling device]
The connecting device may include a fitting / removing connecting portion, a watertight sealing portion, a watertight partition, and a fitting / removing driving portion. It is mounted between the rear end of the excavator and the front end of the buried pipe line.

When using the structure of the excavator or the buried pipe row for a part of the structure among the fitting / disconnecting part, the watertight sealing part, the watertight partition and the fitting / removing drive part, the structure using the excavator or the buried pipe row About, it does not need to be provided in the connecting device.
As the connecting device, one that is separable from each other and includes a front device that is mounted on the excavator and a rear device that is mounted on the buried pipe row can be employed. What is necessary is just to set the distribution or division | segmentation arrangement | positioning of each structure part in a front part apparatus and a rear part so that the function of each structure part can be exhibited favorably. For example, the fitting / removal connecting portion can be divided and arranged in both the front device and the rear device. The watertight seal can be placed on either the front device or the rear device. Watertight bulkheads are usually installed in both the front and rear devices. Usually, the fitting / removing drive unit may be arranged in one of the front device and the rear device. For structures that can be recovered from the water and reused together with the excavator after the construction of the pipeline is completed, it is effective to place it in the front device on the excavator side.

A structure for attaching and fixing the connecting device to the excavator or the buried pipe row can be provided in either or both of the connecting device, the excavator and the buried pipe row. The connecting device may be fixedly installed with respect to the excavator and the buried pipe row, or may be attached and detached as necessary. For example, if the rear device arranged in the buried tube row is removed from the buried tube row after the completion of the construction of the conduit and collected, the rear device can be used repeatedly.
[Construction of pipelines]
The excavator or the underwater recovery method of the excavator has no special restrictions on the material and structure of the excavator and the buried pipe except that the above-described connection structure is provided, so the buried pipe is laid using the excavator. It can be applied to various pipeline construction techniques.

Specifically, for example, a water intake pipe or drainage pipe installed near a water area such as a coast, a lake, or a river is constructed from the power station to the water area, and the pipe is inserted into the water of the water area. This method can be applied to the case where the end of is open. It can be applied to seawater collection pipelines that take in seawater at seawater desalination facilities. It can be applied to a water basin for preventing flood damage and a water discharge pipe for discharging water from an underground water basin. It can be applied to drainage pipes that dispose of thermal wastewater in factories and the like into the sea. It can also be applied to pipelines that discharge treated water from sewage treatment plants into the sea.
Of the pipeline construction work, the stage until the excavator is pushed into the water can be carried out in the same way as normal pipe construction work. Starting shafts that start propulsion of the excavator and jacking jacks that apply thrust to the excavator, work to carry buried pipes from the start shaft and connect to the excavator, control the propulsion direction while propelling the excavator, etc. But there are no special regulations. In addition, if the watertight partition walls provided in the excavator and the buried pipe row are opened so that they can pass freely, there is no problem for the operator to perform work inside the excavator.

As the pipe construction method, a construction method generally called a propulsion embedding method, a propulsion method, a shield propulsion method, a shield method or the like is applied. The buried pipe row that constitutes the pipeline is not only a method in which buried pipes of a predetermined length manufactured in advance are sequentially connected to the tail of the buried pipe row, but also between the excavator and the buried pipe row, or buried It can also be constructed by inserting a pipe wall material constituting a new buried pipe in the middle of the pipe row and adding it to produce a pipe structure.
Even if the excavator advances from the ground to the water at the final stage of the pipeline construction, the fitting / disconnecting part connected in a watertight state by the watertight sealing part can reliably block the entry of water from the outside. . Work inside the excavator is also possible.

It is the excavator and part of the buried pipe line behind it that is propelled from the ground into the water. If only a part of one buried pipe constituting the buried pipe row is advanced into the water, the excavator can be recovered. Multiple buried pipes can be advanced into the water. For example, it is possible to install a pipeline extending underwater from an inclined surface of the coast to the offshore direction.
[Underwater recovery method]
The excavator connected to the buried pipe row with the above-described connection structure is propelled from the ground to the water and then recovered in the water.
The water depth at which the excavator is recovered varies depending on the use of the pipeline to be constructed, the location conditions, and the like, but usually the excavator can be recovered from a depth of 0 to 30 m. As the water depth increases, a structure having higher pressure resistance may be adopted as a watertight structure such as a watertight sealing portion or a watertight partition wall. When the water depth is relatively shallow, there is a case where a special underground seal excavator or a buried pipe line structure can be used as it is without taking any special watertight means.

In the process of propelling the excavator and the buried pipe line, the work procedure and work conditions in the normal propulsion method and the like are adopted. At this stage, the watertight doors of the watertight partition walls provided in each of the excavator and the buried pipe row can be opened. Workers can freely enter and leave the excavator from inside the buried pipe line. Normally, the watertight door can be closed and opened and closed only when passing.
The excavator is propelled from the ground into the water, and the excavator and a part of the buried pipe line are exposed in the water. The remaining part of the buried pipe row is buried in the ground. After the excavator has been propelled, the power cables, control communication lines, hydraulic piping, various measuring equipment, and exhaust mud pipes installed inside the excavator and the buried pipe row should be removed from the rear of the buried pipe row. I can leave. However, the minimum necessary equipment such as a power source necessary for driving the insertion / removal drive unit is left.

Before the excavator is collected, the watertight doors of the watertight partition walls provided in each of the excavator and the buried pipe row are closed. The internal space of the excavator and the buried pipe line should be isolated from the water. An operation such as closing the watertight door can also be performed by an operator entering the excavator from the buried pipe line.
In a state where the watertight door is closed, the fitting / removing drive unit is operated, and the excavator is moved forward of the buried pipe row to release the connection with the buried pipe row. Although water tries to enter the inside of the excavator and the buried pipe row from the fitting / removing connection portion, water does not enter the internal space of the excavator and the buried pipe row isolated by the watertight partition wall.

If the excavator is separated from the buried pipe row, the buried pipe row remains, and the excavator is recovered from the water to the surface of the water. A part of the connecting device can be recovered together with the excavator.
The excavator can be collected by lifting the excavator using a crane, a winch, or the like from the surface of the shore, a ship on the water, a work table, or the like. A submersible worker can enter the water and perform a work of lifting the rope around the excavator and winding the rope or hooking the hook on the metal fitting. With this level of work, a relatively short time is required, and special techniques such as underwater fusing work are not required.
The excavator recovered from the water can be used for the next pipeline construction work. If a part of the connecting device remains in the excavator, it can be reused as it is. You may reuse, after replacing | exchanging some members which may be damaged, such as sealing packing of a watertight sealing part, or performance may fall.

The buried pipe line left in the water can be used as it is for the pipes for various uses described above. A support base that stably supports the buried pipe row on the water bottom, a fixing structure that fixes the buried pipe row, or a protective structure that protects the tip portion can be installed at the tip of the buried pipe row. It is also possible to install protective fences and filter devices that prevent foreign objects from entering. An openable / closable door can also be installed. When installing these structures, it is possible to use the structure of the watertight partition remaining near the tip of the buried pipe row.
If a part of the coupling device remains at the tip of the buried tube row, the remaining members and structures may be removed from the buried tube row and recovered, or left in the buried tube row. . For example, if the equipment of the fitting / removing drive unit is reusable, it is effective to remove it from the buried pipe row and collect it. The watertight bulkhead or the watertight door can be removed and recovered. About the structure which performs these removal collection | recovery, it is desirable to attach with the detachable attachment means, such as bolt fastening, with respect to an embedded pipe line or a connection apparatus.

  The connecting structure of the excavator according to the present invention connects the excavator and the buried pipe line, and drives the fitting / removing drive unit to release the coupling / decoupling unit that is watertightly sealed by the watertight sealing unit. Then, the excavator is separated from the buried pipe line. Even when the excavator is present in the water, the connection / disengagement of the connection / disconnection part by driving the connection / disconnection drive part can be performed easily and quickly. It is not necessary to perform technically difficult diving work for a long time. The watertight bulkhead prevents water from entering the excavator and the buried pipe line. There is no problem even if the connection / disconnection of the fitting / disconnecting part is performed underwater. The excavator, which has been disconnected from the buried pipe row at the fitting / removing portion, has no part that has been cut or destroyed, and can be used as it is for the next pipeline construction work.

  While the excavator is propelled in the ground, it is possible to move freely from the buried pipe line to the excavator through the watertight door of the watertight bulkhead. Even in the state where the excavator and a part of the buried pipe row are propelled into the water, the fitting / disconnecting portion that is watertightly sealed by the watertight sealing portion does not allow water to enter from the outside. The work inside is not different from normal pipe construction work in the ground.

[Construction of pipelines using excavators]
1 to 4 show the pipeline construction work by the propulsion method using the excavator 10 in stages.
<Promotion in the ground>
FIG. 1 shows the construction stage of the propulsion method in the ground. The row of the excavating machine 10 and the buried pipe 20 is propelled horizontally in the ground toward the inclined surface where the ground E falls into the water area S of the sea or river.
Although the illustration is omitted, the starting shaft is excavated perpendicularly from the surface to the ground E in the same manner as the normal propulsion method, and the excavator 10 and the buried pipe 20 are carried in, and the main shaft installed in the starting shaft is installed. Propulsive force is applied to 20 rows of buried pipes from a jack or the like. Power lines, hydraulic / pneumatic pipes, communication lines, and the like supplied to the excavator 10 are also connected from the starting vertical shaft to the excavator 10 through 20 rows of buried pipes.

At this stage, exactly the same work as a normal propulsion method is performed. The excavator 10 is propelled while excavating the ground E by rotating the excavator 12 provided at the tip. The excavated earth and sand are discharged from the starting shaft to the surface through the 20 rows of buried pipes.
The excavator 10 and the buried pipe 20 are connected via connecting devices 30 and 40. Although the watertight bulkheads 31 and 41 are installed in the coupling devices 30 and 40, none of the watertight bulkheads 31 and 41 are sealed off, and the operator goes to the excavator 10 through the inside of the buried pipe 20. can do. Inspection and adjustment of the internal equipment of the excavator 10 can be performed.
<Promotion to underwater>
As shown in FIG. 2, the excavating machine 10 penetrates the inclined surface of the ground E and protrudes into the water area S.

The excavator 12 of the excavator 10 may stop rotating before or after exiting the ground E from the ground E. By applying a propulsive force to the buried pipe 20 row from the rear, the excavator 10 and a part of the buried pipe 20 row that follows are exposed to the water area S. In the watertight partition walls 31 and 41 between the excavator 10 and the buried pipe 20, the watertight doors 32 and 42 are closed. Various cables, pipes, ducts, and the like connected to the excavator 10 are also disconnected from the rear buried pipe 20.
Note that the excavator 10 and the buried pipe 20 having a large cavity inside may receive an external force that warps upward due to a large buoyancy when entering the water area S. In the case of the excavator 10, since the weight of the equipment installed inside is considerable, the buried pipe 20 which is almost hollow inside is greatly affected by the buoyancy even though it is hardly affected by the buoyancy. Therefore, it is effective to bring in heavy objects near the tip inside the 20 rows of buried pipes and offset the buoyancy.

<Separation and recovery of excavator>
As shown in FIG. 3, among the coupling devices 30 and 40, the cylinder device 60 provided in the rear device 30 on the buried pipe 20 side is driven forward, and the front device 40 arranged on the excavator 10 side is moved forward. To move. The cylinder device 60 can be driven from the inside of the buried pipe 20 by an energy supply source such as a hydraulic / pneumatic pipe.
The fitting connection between the rear device 30 and the front device 40 is released, and the buried pipe 20 and the rear device 30, and the excavator 40 and the front device 40 are separated from each other. When the connection between the front device 40 and the rear device 30 is released, the water in the water area S enters the connection devices 30 and 40. However, since the watertight doors 32 and 42 of the watertight partition walls 31 and 41 are closed, water does not enter the buried pipe 20 or the excavator 10 beyond the watertight partition walls 31 and 41. When the front device 40 and the rear device 30 are sufficiently separated, the cylinder device 60 is driven to move out toward the rear device 30.

The excavator 10 and the front device 40 are pulled up from the water area S to the water and collected. If the excavator 10 and the front device 40 are lifted by a crane or the like, or a support base is provided under the excavator 10 before the front device 40 is separated from the rear device 30. When the front device 40 is separated from the rear device 30, the excavator 10 can be prevented from moving or tilting in the water.
The excavator 10 and the front device 40 pulled up from the water can be used for another new propulsion work or an underwater propulsion work. Water does not enter the interior of the excavator 10, and problems such as water immersion, seawater corrosion, and damage of internal equipment do not occur.

<Finishing of pipes buried>
As shown in FIG. 4, the rear device 30 may remain attached to the buried pipe 20. The cylinder device 60 is removed from the rear device 30 and collected. The cylinder device 60 can be reused.
Since the buried pipe 20 protruding into the water area S is not supported at all and tends to become unstable, it is effective to fix the buried pipe 20. A fixing member 90 made of a concrete block or the like is disposed at the tip of the buried pipe 20. The fixing member 90 surrounds the tip of the buried pipe 20 and physically protects it. It is possible to prevent the buried pipe 20 from being deformed or damaged by being hit by a collision of a ship passing through the water area S or a fish net. The fixing member 90 may be installed on the bottom of the water as long as it has a sufficient weight. If a support pile or anchor is driven into the ground E from the bottom of the water, a strong and stable installation can be achieved.

Although not shown in the drawings, the rear end side of the row of buried pipes 20 is connected to, for example, a drain pipe or a water intake pipe of a power plant to construct a pipeline that reaches the water area S. Protective mortar and protective coating can be applied to the inner surface of the 20 rows of buried pipes. In such a work, if the watertight partition wall 31 is cut off at the front end of the buried pipe 20, the worker can enter the inside of the buried pipe 20 row and work freely.
If the watertight door 32 is opened or removed by the watertight partition wall 31 of the rear device 30 after the predetermined pipeline is constructed, the water in the water area S can enter and exit the row of buried pipes 20. For example, the low-temperature water in the water area S can be taken into the cold water intake device of the power plant and used for cooling, or the waste water generated in the power plant can be discharged into the water area S.

[Detailed structural example of connecting part (1)]
5 and 6 show a detailed specific structure of the coupling devices 30 and 40. The connection state of FIG. 2 in the above-mentioned pipeline construction process is shown.
<Rear device>
The rear device 30 has a cylindrical shape that is the same as the outer shape of the buried pipe 20 and is made of a structural material such as a steel material.
The rear end of the rear device 30 is fitted into and integrated with a stepped shape on the outer periphery of the front end of the buried pipe 20. Since the end portion of the buried pipe 20 originally has a step structure used for mutual connection, the buried pipe 20 and the rear device 30 are connected and fixed using this step structure. A sealing material is applied to a fitting portion between the buried pipe 20 and the rear device 30 or a sealing ring is sandwiched between the buried pipe 20 and the rear device 30 so as to be connected in a watertight state.

In the rear device 30, a watertight partition wall 31 is provided on the rear end side connected to the buried pipe 20. The watertight partition wall 31 is made of a steel plate or the like, sufficiently withstands the water pressure in the water that is the construction environment, and prevents water from entering the buried pipe 20 side. In the center of the watertight partition wall 31, there is an opening that allows an operator to enter and exit, and a watertight door 32 is provided in this opening. The watertight door 32 is also made of a pressure resistant steel plate or the like.
As shown in detail in FIG. 6, the outer peripheral edge of the watertight door 32 is fixed to the watertight partition wall 41 with a number of fastening bolts 33. Sealing packing made of rubber or the like is interposed between the facing portions of the watertight door 32 and the watertight partition wall 31 to enhance the watertightness. When necessary, the fastening bolt 33 can be loosened to remove the watertight door 32. The opening of the watertight partition wall 31 can be opened.

In the watertight partition wall 31, through holes 50 are provided at a plurality of locations outside the watertight door 32, and the through holes 50 are digged from the buried pipe 20 such as power cables, communication lines, and hydraulic / pneumatic pipes. Line tubes extending to the machine 10 are inserted. Although not shown in the drawings, the through-hole portion 50 can be sealed in a watertight state by attaching a flange lid or the like after removing the line tubes.
On the front outer periphery of the watertight partition wall 31, there is a fitting inner cylinder 34 that extends forward with an outer circumference that is one step smaller than the outer diameter of the rear device 30 and that performs fitting connection with the front device 40.
A cylinder device 60 is attached to the inner peripheral side of the fitting inner cylinder 34. As shown in FIG. 6, the cylinder devices 60 are arranged at a plurality of locations at equal intervals in the circumferential direction. The cylinder device 60 is driven by air pressure, and an operating shaft 62 provided at the front end of the cylinder device 60 can be driven forward and backward. Although not shown, the line pipes for supplying pressurized air to the cylinder device 60 and controlling the start and stop of the operation of the cylinder device 60 pass through the watertight partition wall 31 from the rear of the cylinder device 60. It is drawn to the inside. The operation of the cylinder device 60 can also be controlled from the starting shaft or the ground surface which is the rear side of the buried pipe 20 or the rear end of the buried pipe 20 row.

<Front device>
The front device 40 is also made of steel like the rear device 30, and the overall shape is the same cylindrical shape as the outer shape of the buried pipe 20. Therefore, the excavator 10, the front device 40, the rear device 30, and the buried pipe 20 all form a continuous cylindrical shape with the same outer shape.
A watertight partition wall 41 similar to the rear device 30 is provided at the rear end of the front device 40, and an opening provided in the center of the watertight partition wall 41 is blocked by a watertight door 42 attached with a tightening bolt 43. . Although not shown, the watertight partition wall 41 is also provided with a through hole portion 50 through which the wire tubes are passed.
A rear outer periphery of the watertight partition wall 41 has a fitting outer cylinder 44 extending rearward along the outer periphery of the front device 40. The fitting outer cylinder 44 is set to have an inner diameter slightly larger than the outer diameter of the fitting inner cylinder 34 of the rear device 30 and substantially the same length as the fitting inner cylinder 34.

On the inner peripheral surface of the fitting outer cylinder 44, sliding sealing materials 46 are attached at three positions in the axial direction. The sliding sealing material 46 is made of a flexible rubber plate or brush material, and is provided over the entire circumference in the circumferential direction of the fitting tube portion 44. The inner peripheral edge of the sliding sealing material 45 contacts the outer peripheral surface of the fitting inner cylinder 34 of the rear device 30, so that the space between the fitting outer cylinder 44 and the fitting inner cylinder 34 is in a water-sealed state. When the fitting outer cylinder 44 is extracted from the fitting inner cylinder 34 in the axial direction, the inner peripheral edge of the sliding sealing material 45 slides along the surface of the fitting inner cylinder 34.
The operating shaft 62 of the cylinder device 60 provided in the rear device 30 abuts on the rear end surface of the front device 40 on the base side of the fitting outer cylinder 44. The front device 40 can be pushed and moved as the operating shaft 62 advances.

<Operation of connecting device>
FIG. 7 corresponds to the state of FIG. 3 in the above-described pipeline construction process, which shows the operating state of the coupling devices 30 and 40.
The cylinder device 60 provided in the rear device 30 is driven, and the operating shaft 62 is moved forward. The front end of the operating shaft 62 comes into contact with the inner rear end surface of the front device 40 and pushes the front device 40 and the excavator 10 forward. The sliding sealing material 45 of the fitting outer cylinder 44 slides on the outer peripheral surface of the fitting inner cylinder 34, and the fitting outer cylinder 44 comes out of the fitting inner cylinder 34 forward. Thereafter, when the operating shaft 62 of the cylinder device 60 is retracted, the tip of the operating shaft 62 moves away from the inner rear end surface of the front device 40 and returns to the rear device 30 side.

In this way, the front device 40 and the excavator 10 are separated from the rear device 30 and the buried pipe 20.
[Detailed structural example of the connecting part (2)]
FIG. 8 shows still another structural example. FIG. 8A shows a connection state between the front device 40 and the rear device 30, and FIG. 8B shows a state at the time of separation work. Description of points that are the same as those in the above embodiment will be omitted, and differences will be mainly described.
Since the front device 40 basically has the same structure as that of the above embodiment, a detailed description thereof will be omitted.

The rear device 30 has a cylindrical frame shape that is fitted to the inner peripheral surface from the front end surface with respect to the front end of the embedded pipe 20. It does not overhang in front of the buried pipe 20 and is housed inside the buried pipe 20.
Then, the step portion present on the outer periphery of the front end of the buried pipe 20 is used as the fitting inner cylinder 34 in the rear device 30. The inner diameter of the fitting outer cylinder 44 of the front device 40 is set slightly larger than the outer diameter of the stepped portion of the buried pipe 20, and the length of the fitting outer cylinder 44 is set to the length of the stepped portion of the buried pipe 20. It is set together. The inner peripheral edge of the sliding watertight material 46 installed on the inner peripheral surface of the fitting outer cylinder 44 comes into contact with and slides on the outer peripheral surface of the stepped portion of the buried pipe 20.

A watertight partition wall 31 and a watertight door 32 similar to those in the above embodiment are provided in the inner periphery of the rear device 30. Near the outer periphery of the watertight partition wall 31, a jack screw device 70 is installed. The jack screw device 70 includes a nut-shaped female screw portion 74 supported and fixed to the watertight partition wall 31 and a male screw shaft 72 that is screwed into the female screw portion 74 and extends in the axial direction. The female screw portion 74 and the male screw shaft 72 are assembled in a watertight state so as not to impair the watertight function of the watertight partition wall 31. The jack screw device 70 is installed at a plurality of locations at intervals in the circumferential direction of the rear device 30.
When the male screw shaft 72 is rotated, the male screw shaft 72 advances and retracts in the axial direction with respect to the female screw portion 74. The front tip of the male screw shaft 72 is in contact with the inner rear end surface of the front device 40. Since the rear end side of the male screw shaft 72 is present behind the buried pipe 20 relative to the watertight partition wall 31, an operator can enter the internal space of the buried pipe 20 and operate the male screw shaft 72.

As shown in FIG. 8B, if the male screw shaft 72 of the jack screw device 70 is turned to advance the male screw shaft 72 forward, the tip of the male screw shaft 72 pushes and moves the front device 40, The front device 40 and the excavator 10 are pushed forward. In the fitting outer cylinder 44 of the front device 40, the sliding sealing material 46 slides along the outer peripheral surface of the fitting inner cylinder 34 using the stepped portion of the buried pipe 20 and comes out.
After the front device 40 and the excavator 10 are separated from the rear device 30, the male screw shaft 72 of the jack screw device 70 is rotated in the reverse direction, and the tip of the male screw shaft 72 is retracted to the inside of the rear device 30. Just keep it.

In this embodiment, by using the jack screw device 70, for example, the structure is simplified and the installation space is small compared to the case of using the cylinder device 60. Suitable for the small-diameter buried pipe 20 and the excavator 10. However, the jack screw device 70 needs to be operated by the operator at the tip of the embedded tube 20 row. If the male screw shaft 72 is driven by a motor or the like, the jack screw device 70 can be driven without the operator entering the embedded tube 20 row.
[Detailed structural example of the connecting part (3)]
FIG. 9 shows still another structural example. FIG. 9A shows a connection state between the front device 40 and the rear device 30, and FIG. 9B shows a state during the separation work. Further, FIG. 9C shows a state in which the rear device 30 is separated from the buried pipe 20. Description of points that are the same as those in the above embodiment will be omitted, and differences will be mainly described.

Since the front device 40 basically has the same structure as that of the above embodiment, a detailed description thereof will be omitted.
The rear device 30 is detachably attached to a stepped portion at the tip of the buried pipe 20. That is, it has the fitting cylinder part 38 which makes a cylindrical shape and extends in the rear side at the rear end of the rear part 30. The outer diameter of the fitting tube portion 38 is the same as the entire outer diameter of the buried tube 20, and the inner diameter of the fitting tube portion 38 is slightly larger than the outer diameter of the stepped portion of the buried tube 20. The length corresponds to the length of the stepped portion of the buried pipe 20. A sliding sealing material 36 similar to the above is disposed on the inner peripheral surface of the fitting cylinder portion 38. The inner peripheral edge of the sliding sealing material 36 contacts the outer peripheral surface of the stepped portion of the buried pipe 20.

The rear device 30 is also provided with a cylinder device 60 common to the above embodiment, a fitting inner cylinder 34 corresponding to the fitting outer cylinder 44 of the front device 40, a watertight partition wall 31, and a watertight door 32.
As shown in FIGS. 9A to 9B, the cylinder device 60 is driven to separate the front device 40 and the excavator 10 from the rear device 30 and the buried pipe 20 in the above embodiment. And in common.
Next, as shown in FIG. 9C, the entire rear device 30 can be separated from the buried pipe 20. Of the above-described pipeline construction process, the work is performed in the finishing stage shown in FIG.

That is, the rear device 30 is pulled forward from the buried pipe 20 in water. The sliding sealing material 36 included in the fitting cylinder portion 38 of the rear device 30 slides on the outer peripheral surface of the step portion of the buried tube 20, and the rear device 30 comes out of the buried tube 20. The entire rear device 30 including the cylinder device 60 and the watertight partition wall 31 is separated from the buried pipe 20. The rear device 30 collects water from the water on the water surface. The collected rear device 30 can be used again for another pipeline construction work.
Since the tip of the buried pipe 20 is greatly opened, the water can enter and exit smoothly. The presence of the watertight partition wall 31 as in the state of FIG. 4 eliminates resistance to water flow. The rear device 30 does not get in the way of the construction work of the fixing member 90.

  The connection structure and underwater recovery method of the excavator according to the present invention can be used for construction of a pipeline from underground to underwater such as construction of a water intake pipeline or a drainage pipeline of a power plant. Compared to ordinary pipe construction only in the ground, construction of underground pipes from the ground to the water, which was considered difficult and costly, can be achieved efficiently and economically with good workability. it can.

The schematic structure figure which shows the construction process of the pipe line showing embodiment of this invention in steps Schematic structure diagram showing the next process Schematic structure diagram showing the next process Schematic structure diagram showing the next process A sectional view in the axial direction showing the detailed structure of the connecting part Sectional view of the buried pipe side in the direction perpendicular to the axis A sectional view in the axial direction showing the operating state of separating the connecting parts Sectional drawing which shows another structural example of a connection part, and its isolation | separation operation state Sectional drawing which shows another structural example of a connection part, and its isolation | separation operation state

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Excavator 12 Excavator 20 Embedded pipe 30 Rear part (connecting device)
31, 41 Watertight partition wall 32, 42 Watertight door 33, 43 Tightening bolt 34 Fitting inner cylinder 40 Front device (connecting device)
44 Fitting outer cylinder 46 Sliding watertight material 50 Through-hole part 60 Cylinder device (fitting / removing drive part)
62 Operating shaft 70 Jack screw device 72 Male screw shaft 74 Female screw part 90 Fixing member E Ground S Water area

Claims (5)

  1. It is a connection structure of an excavator to be propelled from the ground to the water and a buried pipe line connected to the rear of the excavator,
    An engagement / disengagement connecting portion that connects the rear end side of the excavator and the front end side of the buried pipe row in an axially detachable manner;
    A watertight sealing part for sealing the fitting / disconnecting part in a watertight state;
    A watertight partition wall disposed at a rear portion of the excavator and a front portion of the buried pipe row, and a passable opening is closed by a watertight door so as to be freely opened and closed;
    An engagement / disengagement drive unit that is disposed at the rear of the excavator or the front of the embedded pipe row and pushes the opposing buried tube row or the excavator in the axial direction to release the connection of the fitting / disconnecting portion. The connecting structure of the excavator with.
  2. A connecting device including the fitting / removing connecting portion, the watertight sealing portion, the watertight partition wall, and the fitting / removing driving portion is provided between a rear end of the excavator and a front end of the buried pipe row,
    2. The excavator connection structure according to claim 1, wherein the connection device is separable from each other and includes a front device attached to the excavator and a rear device attached to the buried pipe row.
  3. The engagement / disengagement drive unit is disposed at a plurality of locations in the circumferential direction with respect to either the excavator or the buried pipe row, and is disposed in the cylinder device, and operates in a freely movable manner in the axial direction. The connecting structure for an excavator according to claim 1, further comprising: an actuating shaft that is pushed by abutting the tip of the excavator on the side or the buried pipe row.
  4. The fitting / removing drive portion is supported by either the excavator or the buried pipe row, and is screwed into the female screw portion. The connecting structure for an excavator according to claim 1 or 2, wherein jack screw devices having a buried screw train or a male screw shaft that is pushed and abutted on the buried pipe row or the excavator are arranged at a plurality of locations in the circumferential direction. .
  5. A method of recovering in the water after propelling the excavator connected to the buried pipe row with the connection structure according to any one of claims 1 to 4,
    A step (a) of propelling the excavator and the buried pipe row in a state where the watertight doors of the watertight partition walls provided in the excavator and the buried pipe row are opened, and
    A step (b) of closing a watertight door of the watertight partition provided in each of the excavator and the buried pipe row;
    In a state where the watertight door is closed, operating the fitting / removing drive unit, moving the excavator forward of the buried pipe row and releasing the connection with the buried pipe row;
    A step (d) of recovering the excavator separated from the buried pipe row from underwater to the water surface;
    Underwater recovery method for excavators including
JP2005344079A 2005-11-29 2005-11-29 Excavator connection structure and excavator underwater recovery method Active JP4139405B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013002184A (en) * 2011-06-17 2013-01-07 Shimizu Corp Block chamber mechanism used in guiding machine
JP2013167073A (en) * 2012-02-15 2013-08-29 Kidoh Construction Co Ltd Rear cylinder separation device
CN105673935A (en) * 2016-03-24 2016-06-15 北京木石金河环保科技有限公司 Method for replacing underground pipeline through cracking and inserting method
CN105782621A (en) * 2016-04-29 2016-07-20 中铁工程装备集团有限公司 Floating connection device for centre revolving joint of shield machine
JP2016172993A (en) * 2015-03-17 2016-09-29 株式会社熊谷組 Pipe installation device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101778201B1 (en) * 2016-12-19 2017-09-14 주식회사 송현이엔씨 Propulsion method to lift boring machine in water

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013002184A (en) * 2011-06-17 2013-01-07 Shimizu Corp Block chamber mechanism used in guiding machine
JP2013167073A (en) * 2012-02-15 2013-08-29 Kidoh Construction Co Ltd Rear cylinder separation device
JP2016172993A (en) * 2015-03-17 2016-09-29 株式会社熊谷組 Pipe installation device
CN105673935A (en) * 2016-03-24 2016-06-15 北京木石金河环保科技有限公司 Method for replacing underground pipeline through cracking and inserting method
CN105782621A (en) * 2016-04-29 2016-07-20 中铁工程装备集团有限公司 Floating connection device for centre revolving joint of shield machine

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