JP2746866B2 - Drilling device for propulsion method and 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 digging device for a propulsion method and a propulsion method, and more particularly to a propulsion method for burying a buried pipe by propelling the buried pipe into the ground and a digging device used for such a propulsion method.

[0002]

2. Description of the Related Art In a propulsion method, a buried pipe can be laid without digging the ground, so that water and sewage in urban areas, etc.
Widely used for construction of gas and electric piping. In a general propulsion method, a buried pipe is connected to the back of a digging device equipped with a cutter, etc., and the digging device and the buried pipe are propelled while excavating the ground with the digging device. Will be buried. The excavating device is propelled and moved between the starting shaft to start propulsion and the reaching shaft set at a certain distance from the starting shaft, and after the buried pipe is buried between the starting shaft and the reaching shaft, the excavating device is used. Excavation equipment is removed from the ground. To give propulsion to the digging device and the buried pipe, the main push jack installed in the starting shaft applies thrust to the rear end of the buried pipe row, or the digging apparatus is separated from the buried pipe row fixed to the digging apparatus. Or apply thrust to the propulsion shaft train connected to the rear of the vehicle.

[0003] Since the above-mentioned starting shaft and reaching shaft are open to the ground surface, it is preferable to set a long interval between the shafts so as to prevent traffic and use on the ground surface as much as possible. In addition, in order to reduce labor such as construction of a shaft and insertion / removal of devices, it is preferable to increase the interval between shafts, that is, the propulsion distance in one process. Therefore, in recent years, the propulsion distance in one process is often set to a long distance of several hundred meters.

[0004] The propulsion method that does not require excavation of the ground is also applied to the work of burying a buried pipe across the underground of railway tracks and various important structures. When performing the long-distance propulsion method as described above, it often crosses the underground of the railway line or the important structure as described above.

[0005]

When the propulsion method is applied to the crossing point of the above-mentioned railroad track, in order to secure the safety of railway operation, the construction of the propulsion method is continuously performed, and the ground of the track is settled, raised or leveled. You need to monitor your movement. Further, in order to prevent such ground fluctuation, it is necessary to take measures for preventing ground fluctuation such as constructing a temporary structure such as a reinforcing girder.

[0006] The monitoring work as described above is performed by a worker using a measuring machine arranged on or near the track, and is a very laborious and costly work. Also, in the state where temporary structures such as reinforcing girder near the track are installed,
There is a possibility that smooth operation of the railway will be hindered. In the propulsion method, since a force is applied to the ground from a buried pipe that is propelled and moved in the ground, there is a possibility of ground fluctuation at the contact portion with the buried pipe while the buried pipe is being propelled in the ground. Such monitoring work and measures to prevent ground deformation are indispensable.

[0007] In particular, when performing a long-distance propulsion method,
Over a long period of time from the start time to the end time of the propulsion method, the above-described monitoring work of ground deformation and measures for preventing ground deformation are required, which has caused a decrease in construction efficiency and an increase in cost. The above problems arise not only when applying the propulsion method under the railway track, but also when there are various important structures on the ground surface or near the ground surface that need to avoid the effects of ground deformation. This is also a problem. In addition, a similar problem arises when the propulsion method is applied by partially passing through a weak area of the ground.

[0008] An object of the present invention is to reduce the time and effort for monitoring ground fluctuations and preventing ground fluctuations when performing the above-described propulsion method.

[0009]

SUMMARY OF THE INVENTION A propulsion method for a propulsion method according to the present invention relates to a propulsion method in which a buried pipe is propelled into the ground and buried therein. The excavation device includes a tubular main body, a fitting insertion tube body, and excavation means. A first buried pipe is connected to the rear of the tubular main body, and has an outer diameter corresponding to the first buried pipe. The fitting insertion tube body is detachably attached to the cylindrical body so as to cover the outer periphery of the cylindrical body, and a second buried tube covering the first buried tube is connected to the rear thereof, and corresponds to the second buried tube. Has an outer diameter. The excavating means is arranged on the front side of the cylindrical main body, and sets the excavation outer diameter to a first outer diameter corresponding to the outer diameter of the cylindrical main body and a second outer diameter corresponding to the outer diameter of the insertion tube. And can be changed selectively.

The individual components will be described in detail. Buried pipes of various materials and applications to which the buried pipe propulsion method can be applied are used. For example, it is composed of a steel pipe, a fume pipe, a concrete pipe, a synthetic resin pipe and the like, and is used for a sewer pipe, a gas pipe, an electric pipe and the like. Curved pipes are used as well as straight pipes.

According to the present invention, two types of buried pipes having different outer diameters are used, and those having dimensions and shapes capable of covering the outer circumference of the first buried pipe with the second buried pipe are combined. First
The buried pipe and the second buried pipe may be made of different materials. As in the case of the ordinary buried pipe for the propulsion method, a connection structure for connecting the buried pipes and a structure for connecting the buried pipe to the tubular main body and the insertion tube are provided.

The basic structure of the cylindrical main body may be the same as that of an ordinary excavation device for a propulsion method. On the front side, in order to excavate the ground, there is provided an excavating means including an excavating cutter and a cutter holding mechanism for holding and rotating the cutter. Further, a sediment carrying-out mechanism that takes in the excavated earth and sand and sends it backward, and a muddy water supply mechanism that sends muddy water to facilitate excavation of the ground can be provided. Further, a motor and a control device for driving the above mechanism device, a hydraulic or pneumatic pipe for transmitting drive energy, a control cable, and the like are also housed. A surveying device for measuring the position of the digging device can be provided. It is also possible to provide a turning mechanism for changing the propulsion direction of the excavator.

A first buried pipe is connected to the rear of the cylindrical main body. The connection mechanism is the same as that used in the ordinary propulsion method. The outer diameter of the cylindrical main body and the outer diameter of the first buried pipe are set to be substantially the same, but the outer diameter of the cylindrical main body may be slightly larger in some cases. It has an inner diameter that is the same as or slightly larger than the outer diameter of the insertion tube body, and an outer diameter that is the same as or slightly larger than the outer diameter of the second buried pipe, and is made of a material similar to steel and other buried pipes. Consists of a hollow cylinder. It is preferable that a gap is provided between the fitting insertion tube body and the cylindrical main body such that the space can be smoothly mounted and removed. The fitting insertion tube body may have an assembled structure divided into a plurality of portions in the circumferential direction or the axial direction.

On the inner surface side of the fitting insertion tube body, there is provided an attaching / detaching means for connecting and disconnecting the tube body. Specifically, the same structure as a detachable fastening mechanism in various mechanical devices, such as a combination of a detachable engaging portion and a concave portion and a combination of a bolt and a nut, can be applied. If the attaching / detaching means of the insertion / insertion cylinder can be attached / detached from the inside of the cylindrical main body, the operation of separating the cylindrical main body and the insertion / insertion cylinder can be easily performed while being buried in the ground. Specifically, the above-mentioned attachment / detachment mechanism of the attaching / detaching means and the bolt / nut mechanism may be disposed on the inner side through the outer shell of the tubular main body, or the attaching / detaching means may be operated on the outer shell of the tubular main body. It is effective to provide windows and holes that can be used.

[0015] The insertion tube body may be provided with a digging device and a deflection mechanism for changing the direction of propulsion of the buried pipe. Specifically, for example, a deflection cylinder mechanism that expands and contracts in the axial direction can be provided at a plurality of locations in the circumferential direction at the connection portion between the fitting insertion tube body and the second buried pipe. The fitting / inserting cylinder may be divided into front and rear portions, and a deflecting cylinder mechanism similar to the above may be provided at the division. If the deflecting mechanism is detachably attached to the fitting cylinder, the diverting mechanism can be used repeatedly even when the fitting cylinder is buried in the ground.

Excavating means Basically, an excavating mechanism provided with a cutter and a cutter driving mechanism similar to a normal excavating device is used. The arrangement and shape of the cutter, the mechanism for rotating or turning the cutter, and the like are changed according to the soil properties of the ground and other excavation conditions. The excavating means excavates the ground with a predetermined cross-sectional area determined by the arrangement of a cutting tool such as a cutter. The outer diameter of the cross-sectional area to be excavated, that is, the outer diameter of the excavation is selectively changed in two stages, large and small. Specifically, the outer diameter of the cylindrical main body,
A first outer diameter corresponding to the outer diameter of the buried pipe; and a second outer diameter corresponding to the outer diameter of the fitting tube, that is, the outer diameter of the second buried pipe. Here, "corresponding" means not only when the outer diameter of the tubular body or the fitted insertion tube completely matches, but also at a certain rate with respect to the outer diameter of the tubular body or the fitted insertion tube. This includes cases where it is kept small.

The excavating means may include a mobile excavating tool for selectively moving between a position corresponding to the first outer diameter and a position corresponding to the second outer diameter. The mobile digging tool is designed to enable digging operation at any position selected and moved. The movement of the excavation moving tool may be linear movement in the radial direction, or may move to the two positions through a turning motion, a curved motion, or a bending motion. As a means for moving the excavation moving tool, a moving means in a normal mechanical device such as a hydraulic / pneumatic cylinder mechanism, a gear mechanism, and a cam mechanism can be adopted.

The digging means is provided with a normal digging tool disposed inside the outer diameter of the cylindrical main body at the same time as the moving digging tool as described above. Propulsion method The propulsion method according to the present invention uses the excavating device having the above-described configuration and sequentially executes the following two steps.

<First Step> A first buried pipe is connected to the back of the tubular main body, and a second buried pipe is connected to the back of the insertion tube attached to the tubular main body. I do. The excavation outside diameter of the excavation means is set to the second outside diameter. While excavating the ground with the excavating device, the first buried pipe and the second buried pipe are propelled into the ground together with the excavating device. Specifically, with the main push jack described above, thrust is applied to both or one of the rear ends of the first buried pipe and the second buried pipe to push the two buried pipes and the excavating device, or to push the excavating device from the rear end. A thrust may be applied to the propulsion shaft, which is inserted through the center of the first buried pipe to the rear, with a main push jack, and the first buried pipe and the second buried pipe connected to the excavating device may be pulled.

As a result, the outer diameter of the burial hole excavated by the digging device corresponds to the outer diameter of the insertion tube and the second buried pipe. The first buried pipe and the second buried pipe are integrally propelled. New buried pipes are sequentially connected to the first buried pipe and the second buried pipe and are propelled. This step ends when the second buried pipe has been propelled and buried to a predetermined position or distance. The burial position or propulsion distance of the second buried pipe is determined in the following process,
Set according to the purpose of construction. Usually, the propulsion distance of the second buried pipe is set shorter than the subsequent propulsion distance of only the first buried pipe.

<Second Step> In the ground, the connection between the tubular main body and the insertion tube is released. Specifically, the engagement / disengagement or the bolt / nut fastening release is performed in the attaching / detaching means described above. The excavation outer diameter of the excavation means is set to the first outer diameter. Specifically, for example, the movable digging tool is moved toward the center in the radial direction. While excavating the ground with a digging device, that is, a cylindrical main body, only the first buried pipe is propelled into the ground together with the cylindrical main body. At this time, the thrust applied from the main push jack or the like is applied to the propulsion shaft connected to the cylindrical main body or the first thrust.
It acts only on the buried pipe, not on the second buried pipe.

When the tubular main body and the first buried pipe are propelled,
The fitting cylinder and the second buried pipe are left in the ground. At this time, a lubricant or a sliding member can be arranged between the fitting body and the second buried pipe so that the tubular main body and the first buried pipe can smoothly come out of the inside. In particular, the first buried pipe and the second buried pipe need to slide over a long distance. Therefore, it is effective to propel the tubular main body and the first buried pipe while supplying a lubricant between the buried pipes.

As the propulsion proceeds, new buried pipes are sequentially added to the rear of the first buried pipe and propelled. According to the propulsion method described above, the first buried pipe is buried over the entire length of the propulsion distance, and for a fixed distance close to the start position of the propulsion process, the first buried pipe covers the outer periphery of the first buried pipe and the second buried pipe is buried. The pipe will be buried. In the middle of the propulsion process, after the propulsion of the second
The ground in the area where the buried pipe is buried does not receive the force accompanying the propulsion of the first buried pipe. Therefore, in the area where the second buried pipe is buried, it is not necessary to monitor a change in the ground, such as monitoring a railway line. Reinforcement girder to prevent ground fluctuation may be removed.

In the subsequent second step of propelling only the first buried pipe, since the resistance of the ground is hardly applied to the first buried pipe passing through the inside of the second buried pipe, the thrust necessary for propulsion is reduced. Can be reduced. As a result, the propulsion method for a longer distance can be performed beyond the limit of the propulsion distance in one process in the conventional propulsion method. In the state where the propulsion method has been completed, the first buried pipe and the second buried pipe are buried double in a predetermined area such as the underground of the above-mentioned railway track, so that the buried pipe is reinforced and durable. It can also be improved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Excavation Apparatus] As shown in FIGS. 2 and 3, the excavation apparatus has a cylindrical main body 10 and a fitting insertion tube 30 mounted on the outer periphery of the cylindrical main body 10. The cylindrical main body 10 is divided into a front part 12 and a rear part 14, and the fitting parts thereof are sealed with a seal packing 15. Between the front part 12 and the rear part 14, direction correcting jacks 13 are arranged at a plurality of positions in the circumferential direction. By adjusting the amount of expansion and contraction of the direction correcting jack 13, the axial direction of the front portion 12 with respect to the rear portion 14 can be changed.

An excavating mechanism 20 is provided at the tip of the front part 12 of the cylindrical body 10. As shown in detail in FIG. 3, the excavating mechanism 20 has a plurality of bit members 23 attached to the front surface of a rotary excavator 22 having a circular shape having substantially the same diameter as the cylindrical main body 10. Near the outer periphery of the rotary excavator 22, the rotary excavator 2
2 has a movable cutter 25 that protrudes outward from the outer peripheral edge in the radial direction. The moving cutters 25 are arranged on all sides of the rotary excavator 22. As shown in FIG. 4, when the movable cutter 25 is housed in the rotary excavator 22, the outer diameter of the movable cutter 25 substantially matches the outer diameter of the tubular main body 10.

The rotary excavator 22 has an opening for taking excavated earth and sand into the rear side of the rotary excavator 22. Inside the cylindrical body 10, a sediment intake space 16 is provided on the back surface of the rotary excavator 22. The rotating shaft 21 protruding behind the rotary excavator 22 is connected to a drive motor 24 via a transmission gear mechanism 28 disposed behind the earth and sand intake space 16. The rotary excavator 22 is rotated by the operation of the drive motor 24, and excavates the ground in front.

A mud pipe 17 is connected to the sediment intake space 16. The sludge pipe 17 has a sludge pipe and a sludge pipe as a pair. The feeding and discharging pipes 17 are sequentially connected and extend to the rear of the tubular main body 10. Sludge pipe 17 from behind
Water or muddy water, and mixed back with the earth and sand intake space 16 or the earth and sand of the ground to be excavated, and then sent back again through the mud pipe 17 to facilitate excavation of the ground and excavate the earth and sand. Efficiently discharges.

Although not shown, the cylindrical main body 10 is provided with a hydraulic unit for supplying hydraulic pressure for operating the direction correcting jack 13 and the moving cutter 25, and a hydraulic mechanism such as a hydraulic control valve. Also provided are a control panel for electrically controlling each mechanism, a target for measuring the propulsion position of the excavating device, and the like.
A first buried pipe 40 is fitted and connected to the rear end of the tubular main body 10. The outer diameters of the cylindrical main body 10 and the first buried pipe 40 are substantially the same. A seal packing is attached to a contact point between the cylindrical main body 10 and the first buried pipe 40 to prevent intrusion of groundwater or the like.

The insertion cylinder 30 having an inner diameter substantially fitted to the outer periphery of the cylindrical body 10 is a hollow double tube made of steel. The fitting cylinder 30 is fixed to the cylindrical main body 10 by a fixing pin 32 composed of a bolt and nut mechanism. The fixing pin 32 can be removed from the inside of the tubular main body 10.

The front end of the insertion cylinder 30 mounted on the cylindrical main body 10 has a movable cutter 2 projecting to the outer periphery of the rotary excavator 22.
5 behind. The outer diameter of the insertion tube 30 substantially matches the outer diameter of the movable cutter 25 at the projecting position. The second buried pipe 50 is connected to the rear end of the fitting insertion tube 30 via direction correcting jacks 34 arranged at a plurality of positions in the circumferential direction. The outer diameters of the fitting insertion tube body 30 and the second buried pipe 50 are substantially the same. The inner diameter of the second buried pipe 50 is slightly larger than the outer diameter of the first buried pipe 40. By operating the direction correcting jack 34 of the fitting / inserting cylinder 30, the axial direction of the fitting / inserting cylinder 30 with respect to the second buried pipe 50 at the rear can be changed.

[Propulsion Method] FIG. 1 shows a state in which a propulsion method is performed using the above-described excavation device. In this embodiment, a first buried pipe 40 and a second buried pipe 50 having different outer diameters are laid in a ground E including a basement of a railway line R. For example, a fume pipe having an outer diameter of 1500 mm is used as the first buried pipe 40, and a fume pipe having an outer diameter of 1800 mm is used as the second buried pipe 50.

On the side of the railway track R, a starting shaft 70 composed of a vertical hole opening on the ground surface is excavated. Departure shaft 70
Are reinforced with side wall members 72. An arrival shaft 80 is constructed at a position separated from the departure shaft 70 with the railroad track R interposed therebetween. The reaching shaft 80 is also reinforced by the side wall material 72. FIG.
As shown in FIG.
0 is mounted, and the movable cutter 25 is disposed so as to protrude from the outer periphery of the rotary excavator 22.

With the excavator in this state, the ground E is excavated from the side wall of the starting shaft 70. At the rear end of the excavating device, the piston 6 of the main pushing jack 60 installed in the starting shaft 70 is provided.
2. Apply thrust. The repulsive force applied to the main push jack 60 is received by the support block 64 installed between the main push jack 60 and the side wall member 72. After the first buried pipe 40 is connected to the tubular main body 10 of the excavating device, and the second buried pipe 50 is connected to the insertion cylinder 30, the excavation of the ground E by the excavating device and the pushing of the main pushing jack 60 are performed again. Propulsion is performed by adding thrust. The thrust of the main push jack 60 is
Although it may be added to the rear end of both the first buried pipe 40 and the second buried pipe 50, it may be added to only one rear end of the first buried pipe 40 or the second buried pipe 50, and the other buried pipe may be added. May be pulled by the fitting tube 30 or the tubular body 10 at the front.

The propulsion direction of the excavating device is measured by a surveying means as appropriate, and when the propulsion direction is bent, the direction correcting jacks 13 and 34 are operated to change the directions of the cylindrical main body 10 and the insertion cylinder 30. Fix it. By repeating the above steps, the first buried pipe 40 and the second buried pipe 50 are sequentially
It will be buried in the ground E. This process is continued until the distal end position of the second buried pipe 50 exceeds the lower position of the railway line R.

During the above-described process, a force is applied to the ground E under the railroad R under the excavation device and the second buried pipe 50, so that ground deformation of the railroad track R is monitored on the ground surface. Work is performed. If necessary, a reinforcing structure such as a reinforcing girder is installed on or around the railway line R. Next, in the state shown in FIG. 2, the fixing pin 32 is removed, and the connection between the fitting insertion tube 30 and the tubular main body 10 is released.
As shown in FIG. 4, the movable cutter 25 that has protruded is pulled back to the rotary excavator 22.

In this state, the tubular main body 10 and the first buried pipe 40 are propelled. In this case, the original push jack 60
Is not applied to the second buried pipe 50. The row of the cylindrical main body 10 and the first buried pipe 40 slides out of the center of the row of the insertion tube 30 and the second buried pipe 50, and further advances in the ground E. At this time, the first buried pipe 40 and the second buried pipe 50
A lubricant is injected between them to reduce the resistance created between them. Since the row of the fitting cylinder 30 and the second buried pipe 50 does not move, there is no concern that the ground E at that portion, that is, the ground under the railroad track R sinks or fluctuates. Therefore, at this stage, it is not necessary to monitor the ground deformation of the railway line R. Further, if a reinforcing structure such as a reinforcing girder is installed on the railway line R, it may be removed.

As shown in FIG. 1, a row of the cylindrical main body 10 and a row of the first buried pipes 40 following this are buried in the ground E by propulsion. New first buried pipes 40 are sequentially added to the rear end of the row of the first buried pipes 40. In the row of the first buried pipes 40, the portion passing through the inside of the row of the second buried pipes 50 is applied to the entire row of the first buried pipes 40 because the resistance of the ground E is not directly applied. The resistance of the ground E is reduced. As a result, the thrust applied by the main push jack 60 is small. Since the external force applied to the first buried pipes 40 or the joints between the first buried pipes 40 decreases with the propulsion, the first buried pipes 40 having a small proof strength can be used.

These steps are repeated to form the cylindrical main body 10.
Alternatively, when the tip of the first buried pipe 40 reaches the reaching shaft 80, the propulsion method ends. The tubular main body 10 is removed while the first buried pipe 40 remains on the ground E. In the construction completed state, the second buried pipe 50 and the first buried pipe 40 are buried in the underground portion of the railway line R doubly. As a result, it is possible to increase the strength of the buried pipe and greatly improve the durability in a portion where a large load is applied due to the weight, vibration, or the like of the railway line R.

[0040]

According to the present invention, a digging device for a propulsion method and a propulsion method according to the present invention use a digging device in which a cylindrical main body and a fitting cylinder are combined as described above, and are used for excavating a ground such as an underground railway line. The first buried pipe and the second buried pipe are simultaneously propelled in the range where fluctuations must be monitored.
In the range where the monitoring of the ground deformation is not particularly required as described above, the second propulsion of only the first buried pipe is performed.
By performing the steps, the labor required for monitoring the above-mentioned ground deformation can be reduced, and the efficiency and cost of the propulsion method can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a construction state of a propulsion method representing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the excavating device showing a construction state of a first step.

FIG. 3 is a front view of the excavating device in the preceding figure.

FIG. 4 is a cross-sectional view of the excavating device showing a construction state of a second step.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 excavating device 20 excavating means 22 rotary excavator 25 moving excavating tool 30 fitting cylinder 32 fixing pin 40 first buried pipe 50 second buried pipe 60 main push jack E ground R railway track

Claims (4)

(57) [Claims] 1. A digging device in which a buried pipe is protruded into the ground and buried by digging the ground, wherein the buried pipe is connected to the rear and is excavated. A tubular body connected to the pipe and having an outer diameter corresponding to the first buried pipe; detachably mounted on the tubular body so as to cover an outer periphery of the tubular body; A second buried pipe covering the second buried pipe, which is connected to the second buried pipe, and which has an outer diameter corresponding to the second buried pipe; A digging device for a propulsion method, comprising: a digging means that can be selectively changed to a first outer diameter corresponding to the outer diameter of the above and a second outer diameter corresponding to the outer diameter of the fitting insertion tube. 2. The propulsion device according to claim 1, wherein said excavating means includes a mobile excavator for selectively moving between a position corresponding to said first outer diameter and a position corresponding to said second outer diameter. Drilling device for construction method. 3. The excavation device for a propulsion method according to claim 1 or 2, further comprising an attachment / detachment means for performing attachment / detachment operations from an inside of the tubular body between the fitting insertion tube body and the tubular body. 4. A propulsion method using the excavating device according to any one of claims 1 to 3, wherein the first buried pipe is connected to the excavating device at the rear of the tubular main body. The second buried pipe is connected to the back of the fitting insertion tube attached to the cylindrical main body, the excavation outer diameter of the excavation means is set to the second outer diameter, and the ground is Propelling the first buried pipe and the second buried pipe into the ground together with the tubular main body and the fitted insertion tubular body while excavating; and inserting the tubular main body into the ground within the ground. Disengage the connection with the cylindrical body, set the excavation outer diameter of the excavation means to the first outer diameter, and excavate the ground with the excavation device, while only exposing the first buried pipe together with the cylindrical main body. A propulsion method including a step of propelling into the ground.