JP7309599B2 - jacking method - Google Patents

Description

The present invention relates to a jacking method.

Jacking method is widely used as a method of burying pipes in places such as urban areas where the construction area is limited and where consideration of the living environment is required. ing.

In the jacking method, the ground is excavated by an excavator installed in front of the propelling pipe from the starting shaft toward the arrival shaft, and the rear end of the propelling pipe group is pushed in by the main pushing jack device installed in the starting shaft. The pipeline is installed by gradually adding the propulsion pipes.

In addition, in the jacking method, in the case of the mud type, there is a mud pipe that sends mud to the tip of the excavator to stabilize the face surface, a mud pipe that discharges the excavated mud water, and a A power line and a communication line are provided for operation. (In this specification, these pipes and wiring are sometimes collectively referred to as an excavator line.) In addition, since the propulsion pipe used in the jacking method is an integrally formed cylindrical shape, the propulsion pipe When replenishing, it is essential to cut the line for the excavator each time, install the propulsion pipe in the starting shaft, and then connect the line for the excavator (for example, see Patent Document 1).

JP-A-8-75048

Excavator excavation requires that the excavator line be connected to the excavator, and when installing the propulsion pipe, the excavator line must be disconnected and reconnected each time. .
In addition, when installing additional propulsion pipes in the starting shaft, it is necessary to secure the installation space for the propulsion pipes and to press the rear end of the propulsion pipes, so it is essential to retract the original pushing jack and pull it back. ing.
In this way, when the propulsion pipe is installed in the starting shaft, the excavator is not excavated and the main push jack is also pulled back, so there is a period in which the excavator cannot excavate. do.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a jacking method that allows an excavator to continue excavation while a jacking pipe is being installed in a starting shaft.

The invention according to claim 1 of the present application is a jacking method in which an excavator is provided in front and the rear end of a group of propelling pipes connected to it is pressed by extension of a main pushing jack to install the group of propelling pipes in the ground. The excavator has a thrust jack that can extend and press a rear propulsion pipe to excavate, and the excavator excavates by pushing the rear propulsion pipe by extending the thrust jack. a thrust jack excavation process, a main thrust jack excavation process in which the excavator presses the propulsion pipe group by extension of the main push jack and excavates with the excavator, and a main push jack release in which the main push jack does not press the propulsion pipe group. wherein the thrust jack excavation step is performed in parallel with the original pushing jack releasing step using the frictional resistance of the natural ground generated on the outer peripheral surface of the propulsion pipe group as a propulsion reaction force, and the thrust jack is removed. A jacking method characterized in that the frictional resistance as a propulsive reaction force in the propulsion process includes frictional resistance obtained by a movable frictional resistance mechanism provided on the outer peripheral surface of the propulsion pipe of the propulsion tube group. is.
The invention according to claim 2 of the present application is a jacking method in which an excavator is provided in front and the rear end of a group of promotion pipes connected to the group of promotion pipes is pushed by extension of a main pushing jack to install the group of promotion pipes in the ground. The excavator has a thrust jack that can extend and press a rear propulsion pipe to excavate, and the excavator excavates by pushing the rear propulsion pipe by extending the thrust jack. a thrust jack excavation process, a main thrust jack excavation process in which the excavator presses the propulsion pipe group by extension of the main push jack and excavates with the excavator, and a main push jack release in which the main push jack does not press the propulsion pipe group. wherein the thrust jack excavation step is performed in parallel with the original pushing jack releasing step using the frictional resistance of the natural ground generated on the outer peripheral surface of the propulsion pipe group as a propulsion reaction force, and the thrust jack is removed. During the propulsion process, the primary thrust jack is extended to the rear end of the propulsion tube group, and the load on the primary thrust jack is detected from the propulsive force transmitted from the thrust jack through the propulsion tube group. and confirming whether or not the thrust reaction force in the thrust jack excavation process can be obtained.
The invention according to claim 3 of the present application comprises a propelling pipe carrying-in step of carrying a propelling pipe between the propelling pipe group and the main pushing jack, wherein the propelling pipe carrying-in step moves the propelling pipe into the starting shaft. a first propulsion pipe loading step in which the propulsion pipe is placed on the starting frame provided in the first step; and a second propulsion pipe loading step in which the propulsion pipe placed on the starting frame is pressed by the main pushing jack and comes into contact with the propulsion pipe group. 3. The jacking method according to claim 1 or 2, wherein the first step of carrying in the propelling pipe and the second step of carrying in the propelling pipe are performed in parallel with the step of excavating with the thrust jack. be.
In the invention according to claim 4 of the present application, the excavator includes an excavator line connected for excavation, and the excavator line extends from behind the propulsion tube group to in front of the main pushing jack. a line retraction step of retracting to a position that does not interfere with placement of the propelling pipe in the propelling pipe carrying-in first step, wherein the line retracting step is performed in parallel with the propelling pipe carrying-in first step. The jacking method according to claim 3, characterized by:
The invention according to claim 5 of the present application comprises a line cutting step of cutting the excavator line retracted in the line retracting step, and the propulsion pipe carrying-in second step is performed after the line cutting step. The jacking method according to claim 4, characterized by:
In the invention according to claim 6 of the present application, the excavator is provided with two lines, each including a first line and a second line, for the excavator line connected for excavation, and the second line is the propulsion line. a line retracting step of retracting from the rear of the tube group to a position in front of the main pushing jack and not interfering with the placement of the propelling pipe in the propelling pipe carrying-in first step, wherein the line retracting step comprises: The jacking method according to claim 3, wherein the jacking method is performed in parallel with the first step of carrying in the jacking pipe.
The invention according to claim 7 of the present application comprises a second line cutting step of cutting the second line retracted in the line retracting step, and during the second line cutting step, the first line cuts the second line. 7. The jacking method according to claim 6, wherein a thrust jack excavation step is performed, and the second step of carrying in the propelling pipe is performed after the step of cutting the second line.
Further, the following may be used as another invention.
Means 1 is a jacking method in which an excavator is provided in front and a rear end of a group of propulsion pipes connected to the propulsion pipes is pushed by extension of a main pushing jack to install the group of propulsion pipes in the ground, wherein the excavation The machine has a thrust jack that extends and pushes the rear propulsion pipe to excavate, and a thrust jack excavation step in which the excavator pushes the rear propulsion pipe by extending the thrust jack and excavates. and a main pushing jack excavation step of pushing the propelling pipe group by extension of the main pushing jack and excavating with the excavator.

The means 2 is characterized in that it comprises a primary pushing jack releasing step in which the primary pushing jack does not press the propulsion tube group, and the thrust jack excavation step is performed in parallel with the primary pushing jack releasing step. It is a jacking method according to means 1 .

Means 3 includes a propulsion pipe carrying-in step of carrying in a propulsion pipe between the group of propulsion pipes and the main pushing jack, wherein the propulsion pipe carrying-in step includes a starting pedestal provided with the propulsion pipe in a starting vertical shaft. and a second propulsion pipe carrying-in step of pressing the propulsion pipe placed on the starting frame with the main pushing jack and bringing it into contact with the propulsion pipe group. The jacking method according to means 2, wherein the first step of carrying in the propelling pipe and the second step of carrying in the propelling pipe are performed in parallel with the thrust jack excavation step.

The means 4 includes an excavator line connected to the excavator for excavation, and the excavator line is moved from the rear of the propulsion pipe group to the front of the main pushing jack to carry in the propulsion pipe. and a line retracting step of retracting to a position that does not interfere with placement of the propulsion pipe in the first step, wherein the line retracting step is performed in parallel with the first propulsion pipe carrying-in step. It is a jacking method according to means 3 .

The means 5 includes a line cutting step of cutting the excavator line retracted in the line retracting step, and the propulsion pipe carrying-in second step is performed after the line cutting step. It is a jacking method according to means 4 .

The means 6 is provided with two systems of excavator lines, each including a first line and a second line, to which the excavator is connected for excavation. a line retraction step of retracting to a position in front of the main pushing jack and not interfering with placement of the propelling pipe in the propelling pipe loading first step, wherein the line retracting step is the propelling pipe loading first step; It is a jacking method according to means 3, characterized in that it is performed in parallel with one step.

The means 7 includes a second line cutting step of cutting the second line retracted in the line retracting step, and during the second line cutting step, the thrust jack digging step is performed by the first line. The jacking method according to means 6, wherein the second step of carrying in the propelling pipe is performed after the step of cutting the second line.

With the configurations according to claims 1 to 7, it is possible to provide a jacking method that allows the excavator to continue excavation even while the jacking pipe is installed in the starting shaft.

The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 1(a) is a YY cross-sectional view in FIG. 1(b), and FIG. XX cross-sectional view. Fig. 2(a) is a cross-sectional view of the excavator employed in the first embodiment, Fig. 2(a) showing a retracted state of the thrust jack, and Fig. 2(b) showing an extended state of the thrust jack. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 3(a) is a YY cross-sectional view in FIG. 3(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 4(a) is a YY cross-sectional view in FIG. 4(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 5(a) is a YY cross-sectional view in FIG. 5(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 6(a) is a YY cross-sectional view in FIG. 6(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 7(a) is a YY cross-sectional view in FIG. 7(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 8(a) is a YY cross-sectional view in FIG. 8(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 9(a) is a YY cross-sectional view in FIG. 9(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 10(a) is a YY cross-sectional view in FIG. 10(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 11(a) is a YY sectional view in FIG. 11(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 12(a) is a YY sectional view in FIG. 12(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 13(a) is a YY sectional view in FIG. 13(b), and FIG. XX cross-sectional view. The propulsion tube group and the starting shaft of the first embodiment are shown to show the propulsion process, FIG. 14(a) is a YY sectional view in FIG. 14(b), and FIG. XX cross-sectional view. Fig. 15(a) is a time chart of the propulsion process of the propulsion pipe group, and Fig. 15(b) is that of the first embodiment. The propulsion tube group and the starting shaft of the second embodiment are shown to show the propulsion process, FIG. 16(a) is a YY cross-sectional view in FIG. XX cross-sectional view. Fig. 17(a) is a time chart of the propulsion process of the propulsion pipe group, and Fig. 17(b) is that of the second embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, it cannot be overemphasized that this invention is not limited to embodiment.

[First embodiment]
A first embodiment according to the present invention will be described below with reference to FIGS. 1 to 15. FIG.
This embodiment applies the jacking method of the present invention to a slurry jacking method.

FIG. 1 shows a situation in which a jacking pipe is buried in the ground by the jacking method.
As shown in FIG. 1 , the excavator 1 is arranged in front of the propulsion tube group 3 , and the propulsion tube group 3 is propelled by a main pushing jack device 20 provided in the starting shaft 2 .

As shown in FIG. 1, the starting pit 2 is provided with at least a main pushing jack device 20, a starting pit 21, a starting pedestal 22, a pit first line 25, and a pit second line .

The propulsion pipe group 3 is formed by connecting a plurality of propulsion pipes 30, as shown in FIG. The tail end of the propulsion pipe 30 is pushed by the main pushing jack device 20, and a predetermined length is pushed into the starting wellhead 21, and the remainder is positioned above the starting platform 22. .

The vertical pit first line 25 is provided for excavation by the excavator 1, and includes at least a power/communication line, a sludge feed pipe, and a sludge discharge pipe. In the drawings of this embodiment, only the sludge discharge pipe is shown as the pit first line 25, and reference numeral 27 denotes the pit first valve attached to the end of the sludge discharge pipe. A valve is attached to the sludge pipe as well. The shaft first line 25 is connected to ground facilities (not shown).

The shaft second line 26 is provided for excavation by the excavator 1, and is composed of at least a power/communication line, a sludge feed pipe, and a sludge discharge pipe. In the drawings of this embodiment, only the sludge drain pipe is shown as the pit second line 26, and reference numeral 28 indicates the pit 2 valve attached to the end of the sludge drain pipe. A valve is attached to the sludge pipe as well. The shaft second line 26 is connected to ground facilities (not shown).

As shown in FIG. 1, the first line 15 and the second line 16 are laid from the ends of the first vertical shaft line 25 and the second vertical shaft line 26 in the starting vertical shaft 2 to the propulsion pipes 30 of the propulsion pipe group 3. It is

The first line 15 is provided for excavation by the excavator 1, and is composed of at least a power/communication line, a mud pipe, and a mud discharge pipe, like the shaft first line 25. As shown in FIG. In the drawings of this embodiment, only the mud discharge pipe is shown as the first line 15 .

The second line 16 is provided for excavation by the excavator 1, and is composed of at least a power/communication line, a sludge feed pipe, and a sludge discharge pipe, like the shaft second line 26. As shown in FIG. In the drawings of this embodiment, only the mud discharge pipe is shown as the second line 16 .

As shown in FIG. 1 , a pipeline line 14 is laid from the excavator 1 into the propulsion pipe 30 of the propulsion pipe group 3 .

The conduit line 14 is provided for excavation by the excavator 1, and, like the first line 15, is composed of at least a power/communication line, a sludge feed pipe, and a sludge discharge pipe. In the drawings (except for FIG. 2) in this embodiment, only the sludge discharge pipe is shown as the pipeline line 14. As shown in FIG.
The end portion of the pipeline line 14 on the side of the starting shaft 2 branches into a Y shape.
The end portion of the pipeline line 14 on the side of the excavator 1 will be described later.

Valves are provided in the sludge feed pipe and the sludge discharge pipe at one end of the Y-shaped pipeline line 14 . The drawing in this embodiment shows the first pipe valve 17 attached to the mud discharge pipe. Valves are also provided on the sludge feed pipe and the sludge discharge pipe at the other end of the Y-shaped pipeline line 14 . The drawing in this embodiment shows the second pipe valve 18 attached to the mud discharge pipe.

As shown in FIG. 1A, the first line 15 is connected to the end of the pipeline line 14 on the first valve 17 side. A second line 16 is connected to the end of the pipeline line 14 on the second valve 18 side.
With such a configuration, the excavator 1 can perform excavation using the pipeline line 14, the first line 15, and the vertical shaft first line 25, and the pipeline line 14, the second line 16, and the vertical shaft second line 26. It is possible to excavate with two lines when excavating using.

FIG. 1(a) shows that the excavator 1 is excavating using the pipeline line 14, the first line 15, and the shaft first line 25, and arrows are attached in the vicinity. The pipeline first valve 17 and the pit first valve 27 are open, and the pipeline second valve 18 and the pit second valve 28 without arrows near them are closed.
In FIG. 1(b), the first line 15 is hatched and used for excavation, while the second line 16 is not hatched and not used for excavation. state.

The first line 15 is detachably connected to the pipeline line 14 and the vertical shaft first line 25 so that the re-building work can be performed. When disconnecting the first line 15, the pipeline first valve 17 and the pit first valve 27 are closed to prevent muddy water from spilling. The valves of the sludge pipes are similarly closed.
Similarly, the second line 16 is also detachably connected to the pipeline line 14 and the vertical shaft second line 26 so that re-building work can be performed. Similarly, when cutting the second line 16, the second valve 18 of the pipeline and the second valve 28 of the pit are closed.

Next, the excavator 1 and the end portion of the pipeline line 14 on the excavator 1 side will be described with reference to FIG.

As shown in FIG. 2, the excavator 1 comprises at least a front body section 4 and a rear body section 5 .

At least a rotary cutter 10 and a driving portion 11 are provided on the front body portion 4 . The rotary cutter 10 excavates the face in front of the excavator 1 by being rotated by power supply from the drive unit 11 .

The rear trunk portion 5 is provided with a rear trunk portion outer shell 12 a , a rear trunk portion inner shell 12 b , and a plurality of thrust jacks 13 .
As shown in FIG. 2( a ), the rear trunk portion outer shell 12 a is formed in a cylindrical shape as the outer shell of the rear trunk portion 5 . A cylindrical rear body inner shell 12b is accommodated inside the rear body outer shell 12a.
The rear trunk portion outer shell 12a and the rear trunk portion inner shell 12b are provided with a telescopic mechanism, and as shown in FIG. can do.

The thrust jack 13 is a hydraulic cylinder having a piston rod 13a and a cylinder tube 13b. The piston rod 13a is attached to the rear body outer shell 12a, and the cylinder tube 13b is attached to the rear body inner shell 12b.
FIG. 2(a) shows a state in which the thrust jack 13 is contracted. FIG. 2(b) shows a state in which the thrust jack 13 is extended.

As shown in FIG. 2B, in the excavator 1, as the thrust jack 13 extends, the rear trunk outer shell 12a and the rear trunk inner shell 12b slide in conjunction with the piston rod 13a and the cylinder tube 13b, respectively. By moving, the rear trunk portion inner shell 12b is pulled out rearward from the rear trunk portion outer shell 12a so that the rear trunk portion 5 can be extended.
By rotating the rotary cutter 10 to extend the thrust jack 13 and press the front portion of the propulsion tube 30 at the head of the propulsion tube group 3, the excavator 1 can excavate.

The use stroke of the thrust jack 13 is set as a stroke that allows the thrust jack 13 to excavate during a period corresponding to the period in which the original pushing jack device 20 cannot excavate. Details will be described later.

As shown in FIG. 2, the excavator 1 is connected to a pipeline line 14 including a power/communication line 14a, a mud feed pipe 14b, and a mud discharge pipe 14c.
In the propulsion pipe group 3, the power/communication line 14a, the mud feed pipe 14b, and the mud discharge pipe 14c are provided so as to follow the extension state of the thrust jack 13. As shown in FIG.
Specifically, the power/communication line 14a is formed in the shape of a flexible curled cord and has elasticity. Further, the sludge-sending pipe 14b and the sludge-discharging pipe 14c are equipped with a telescopic mechanism and are provided to be extendable.

Next, referring to FIGS. 1 and 3 to 15 in order, the process of excavation by the excavator 1 in this embodiment will be described.

As shown in FIG. 1, while the thrust jack 13 of the excavator 1 arranged in front of the propulsion pipe group 3 is in the most retracted state, the rotary cutter 10 is rotated to perform excavation, and the excavator is propelled by the main thrust jack device 20. Excavation is performed by pushing the tube group 3 (primary pushing jack propulsion step). This process is the same as the so-called normal conventional jacking method.

As shown in FIG. 1 , the excavation of the excavator 1 is performed using a pipeline line 14 , a first line 15 and a shaft first line 25 . The pipeline first valve 17 and the pit first valve 27 are in an open state, and the pipeline second valve 18 and the pit second valve 28 are in a closed state.
A second line 16 is connected to the pipeline second valve 18 side of the pipeline line 14 and the shaft second line 26 .

FIG. 3 shows a state in which all the propulsion pipes 30 at the rear end of the propulsion pipe group 3 are pushed in from the starting shaft 2 and the main pushing jack excavation process is completed.
The thrust jack 13 of the excavator 1 remains in the most contracted state, and the original pushing jack device 20 is in the most extended state.

As shown in FIG. 4 , the excavator line is switched from the first line 15 and the first line 25 of the vertical shaft to the second line 16 and the second line of the vertical shaft, and the rotary cutter 10 of the excavator 1 is changed. When the thrust jack 13 is rotated, the thrust jack 13 is extended, and the propulsion pipe group 3 is pressed, excavation of only the excavator 1 (thrust jack excavation process) is started.

In switching the excavator line, the pipeline first valve 17 and the pit first valve 27 are closed, and the pipeline second valve 18 and the pit second valve 28 are opened. Then, the first line 15 is removed from the pipeline line 14 and the shaft first line 25 (first line cutting step).

Since the thrust jack excavation process excavates by the reaction force from the propulsion pipe group 3, the frictional resistance of the ground generated on the outer peripheral surface of the propulsion pipe group 3 can be obtained as the propulsion reaction force. conduct. Until then, the normal thrust jack propulsion process is performed.

When the thrust reaction force in the thrust jack excavation process cannot be obtained due to a lubricant or the like, a movable frictional resistance mechanism (for example, an airbag or a jack) is attached to the outer peripheral surface of any of the propulsion tubes 30 of the propulsion tube group 3. ) to operate the frictional resistance mechanism to obtain necessary frictional resistance when the thrust jack excavation process is performed, and the frictional resistance mechanism is released when the main pushing jack propulsion process is performed.
Also, other mechanisms may be used instead of the frictional resistance mechanism. For example, a mechanism may be provided to hold the rear portion of the propulsion tube group or receive a load so that the propulsion tube group does not retreat on the wall surface where the propulsion wellhead of the starting shaft is provided. In this case as well, the holding mechanism and the load receiving mechanism are released when the original pushing jack propulsion process is performed.

As shown in FIG. 4(a), when the thrust jack excavation process is started, the original pushing jack device 20 is in the most extended state. At this time, it is confirmed whether the force from the thrust jack 13 is transmitted through the propulsion pipe group 3 by detecting the hydraulic pressure of the main thrust jack device 20. It may be checked whether it can be obtained from the group 3.

As shown in FIG. 5, the thrust jack excavation process is continued, and the main pushing jack device 20 is contracted so that the main pushing jack device 20 does not press the propulsion tube group 3 (main pushing jack releasing step).
As shown in FIG. 5( a ), when the original pushing jack device 20 is contracted, a space for carrying a new propulsion pipe 30 into the starting shaft 2 is created.

As shown in FIG. 6, while continuing the thrust jack excavation process, the second line 16 is evacuated (second line evacuation process), and a new propeller pipe 30 to be the propeller pipe group 3 is installed on the starting platform in the starting shaft 2. 22 (propulsion pipe carrying-in first step).
In the second line evacuation process, the new propulsion pipe 30 to be brought in is laid on the start frame 22 from the rear of the propulsion pipe group 3 to the front of the original pushing jack device 20 so as not to interfere when it is placed on the start frame 22. It is intended to move the second line 16 of the part that is covered. Specifically, as shown in FIGS. 6( a ) and 6 ( b ), the retracted portion of the second line 16 is moved to the bottom portion of the starting shaft 2 .
In the first process of carrying in the propulsion pipes, new propulsion pipes 30 to be used as the propulsion pipe group 3 are carried into the starting shaft 2 and mounted on the starting pedestal 22 .

As shown in FIG. 7, the thrust jack excavation step is continued, and a new propulsion pipe 30 is mounted on the starting platform 22 to complete the first propulsion pipe carrying-in step.
Since the second line evacuation process is completed, the thrust jack excavation process can be continued using the second line 16 even if a new propulsion pipe 30 is placed on the start frame 22.例文帳に追加

As shown in FIG. 8, while continuing the thrust jack excavation step, the cut first line 15 is connected between the pipeline line 14 and the shaft first line 25 (first line connecting step). This completes the replacement work from disconnection of the first line 15 to reconnection.
In the first line connecting step, the first line 15 is arranged through the inside of a new propulsion pipe 30 mounted on the starting platform 22 . Also, the pipeline first valve 17 and the pit first valve 27 are kept closed.

As shown in FIG. 9, the excavator line is switched from the second line 16 and the second line 26 of the pit to the first line 15 and the first line 25 of the pit to continue the thrust jack excavation process. .
In switching the excavator line, the pipeline first valve 17 and the pit first valve 27 are opened, and the pipeline second valve 18 and the pit second valve 28 are closed.

As shown in FIG. 10, the thrust jack excavation step is continued, and the second line 16 that has been withdrawn from the pipeline line 14 and the shaft second line 26 is removed (second line cutting step).
A new propulsion tube 30 mounted on the starting platform 22 can be moved to be connected to the rear end of the propulsion tube group 3 by the second line cutting step.

As shown in FIG. 11, while continuing the thrust jack excavation step, the cut second line 16 is connected between the pipeline line 14 and the shaft second line 26 (second line connecting step). This completes the replacement work from disconnection of the second line 16 to reconnection.
In the second line connecting step, the second line 16 is arranged through the inside of a new propulsion pipe 30 mounted on the starting platform 22 . Also, the pipeline second valve 18 and the shaft second valve 28 are kept closed.

As shown in FIG. 12 , while continuing the thrust jack excavation process, the main pushing jack device 20 is extended to move the new propelling pipe 30 mounted on the starting platform 22 toward the rear end of the propelling pipe group 3 . Move (propulsion pipe carrying-in second step).
In the second step of carrying in the propulsion pipe, the line for the excavator passes through the inside of the propulsion pipe 30 to be moved, so that it does not interfere with the movement of the propulsion pipe 30 .

As shown in FIG. 13, the new propulsion pipe 30 mounted on the starting platform 22 is connected to the propulsion pipe group 3 to complete the second propulsion pipe loading step.
Also, the thrust jack excavation process is completed. At this time, the thrust jack 13 of the excavator 1 is fully extended.

From this state, the main pushing jack device 20 is extended to push the propulsion tube group 3 and contract the thrust jack 13 (propulsion tube group pushing step).

As shown in FIG. 14, in the propulsion tube group pushing process, the excavator 1 does not excavate, so no excavation is performed, and the propulsion tube 30 newly connected to the propulsion tube group 3 is compressed by the amount of contraction of the thrust jack 13 (front side). is pushed from the starting shaft 2 by the amount excavated in the thrust jack excavation process in the construction cycle of .
FIG. 14 shows a state in which the propulsion tube group pushing process has been completed, and propulsion has advanced by 30 minutes for one propulsion tube from the state shown in FIG.
The cycle then repeats in the same way.

Next, referring to FIG. 15, the cycle time in this embodiment will be described in comparison with the conventional construction method.

In the explanation, each condition is as follows.
The propulsion tube 30 to be used has a length of 2.43 m. The jack speeds of the thrust jack 13 and the original pushing jack device 20 during excavation are both set to 20 mm/min.

FIG. 15(a) is a time chart of the conventional construction method, showing the start of the original pushing jack excavation process as the base point of 0 min.

While excavating with an excavator, the propulsion tube group is pushed by the main thrust jack device, and excavation of 2.43 m, which is the length of the propulsion tube, is performed. This pushes all the propulsion tubes out of the launch shaft.

When the original pushing jack excavation process is completed, the following processes are performed.
・Line cutting process (5 min)
・Original push jack release process (10 min)
・Propulsion pipe first process (20 min)
・Line connection process (5 min)
・Propulsion pipe loading 2nd process (10 min)
・Excavator excavation preparation (5 min)

Numbers with min in parentheses indicate the time required for each step (same hereafter). In preparation for excavation by the excavator, work until the excavation by the excavator can be started, such as restarting the rotary cutter, feeding mud to the excavator, and discharging mud from the excavator, is performed.

From the start of the line cutting process in which the line for the excavator is cut to the completion of preparation for excavation by the excavator, the excavator cannot excavate. This state lasts for 55 minutes, after which the next cycle, the main pushing jack excavation process for a new propulsion pipe, is started.
Thus, the cycle time of the conventional method is 176.5 minutes.

Next, the time chart of the present embodiment will be described with reference to FIG. 15(b). Before that, the distance for the thrust jack excavation process, in other words, the working stroke of the thrust jack 13 is set. In the thrust jack excavation process, a period during which the thrust jack excavation process can be performed is set within a period from when the main pushing jack device 20 is released until excavation becomes possible again by the main pushing jack device 20.例文帳に追加.
Specifically, it is a period during which the following steps are performed.

Performed together with the thrust jack excavation process using the second line 16 ・First line cutting process (5 min) (Fig. 4)
・Original push jack release process (10 min) (Fig. 5)
・Second line evacuation process (5 min) and first propulsion pipe loading process (20 min) (Figs. 6 and 7)
・First line connection step (5 min) (Fig. 8)

What is performed together with the thrust jack excavation process using the first line 15 ・Second line cutting process ・Second line connection process (5 min) (Figs. 10 and 11)
・Propulsion pipe loading second process (10 min) (Fig. 12)

Although the propulsion tube group pushing process (10 min) (FIGS. 13 and 14) is performed and excavator excavation preparation (5 min) is performed, the thrust jack excavation process cannot be performed during this period.

These are 40 min (performed with the thrust jack excavation process using the second line 16) and 15 min (performed with the thrust jack excavation process using the first line 15) for a total of 55 min.
Since the jack speed is 20 mm/min, the excavation length for the thrust jack excavation process is 1.1 m. Therefore, the remaining 1.33 m is excavated in the main pushing jack excavation step.

FIG. 15(b) is a time chart of the present embodiment, showing the start of the original pushing jack excavation process shown in FIG. 1 as the base point of 0 min.

At this point, as shown in FIG. 1(a), the propulsion tube group pushing process has been completed, so the propulsion tube group 3 has already been pushed 1.1 m from the starting wellhead 21. As shown in FIG.

In the main thrust jack excavation process, the remaining 1.33 m of the propulsion pipe 30 is excavated in 66.5 minutes. FIG. 3 shows a state in which the original pushing jack excavation process is completed.

After the main thrust jack excavation process is completed, the thrust jack excavation process (after the thrust jack excavation process using the second line 16, the thrust jack excavation process using the first line 15) is performed for 1.1 m (55 min). Along with this, the following steps are performed.

Performed together with the thrust jack excavation process using the second line 16 ・First line cutting process (5 min) (Fig. 4)
・Original push jack release process (10 min) (Fig. 5)
・Second line evacuation process (5 min) and first propulsion pipe loading process (20 min) (Figs. 6 and 7)
・First line connection step (5 min) (Fig. 8)

What is performed together with the thrust jack excavation process using the first line 15 ・Second line cutting process ・Second line connection process (5 min) (Figs. 10 and 11)
・Propulsion pipe loading second process (10 min) (Fig. 12)
The thrust jack excavation process using the second line 16 takes 40 minutes, and the thrust jack excavation process using the first line 15 takes 15 minutes.

After the thrust jack excavation process, the propulsion tube group pushing process (10 min) (FIGS. 13 and 14) is performed, and excavator excavation preparation (5 min) is performed.

Therefore, in this embodiment, the main thrust jack excavation process takes 66.5 minutes, the thrust jack excavation process takes 55 minutes, and the propulsion tube group pushing process takes 10 minutes, resulting in a cycle time of 131.5 minutes. can.

In this way, thrust jack excavation can be used for part of the excavation with the main jack, and during the thrust jack excavation period, the main jack can be pulled back, a new propulsion pipe can be brought in, and the line for the excavator can be replaced. , the cycle time can be shortened.
In addition, by providing two excavator lines, it is possible to efficiently perform excavation work even when the propulsion pipe is being brought in, thereby shortening the cycle time.

Note that in this embodiment, as shown in FIG. It should be completed by the time it is completed.

Further, when the line is switched from the second line 16 to the first line 15, there occurs a period in which the excavator 1 cannot perform excavation. 18, personnel are assigned to the shaft first valve 27 and the shaft second valve 28, respectively, so as to minimize the time during which excavation cannot be performed by performing operations in a timely manner.

Further, in the second line cutting step, another second line 16 to be connected in the second line connecting step is prepared, and after passing through the inner peripheral portion of the propulsion pipe 30, the second line 16 in the connected state is prepared. It is preferable to cut the line 16 . By doing so, it is possible to immediately perform the second line connection step by connecting another second line 16 immediately after disconnecting the second line 16 .
For this reason, the line cutting step and the line connecting step required 5 minutes and 5 minutes, respectively, 10 minutes in total in the conventional method.

[Second embodiment]
A second embodiment according to the present invention will be described below with reference to FIGS. 16 and 17 of the drawings. The description of the same parts as in the first embodiment will be omitted, and mainly the different parts will be described.

In this embodiment, one excavator line is operated for excavation by the excavator 1 as in the conventional construction method.
As shown in FIG. 16, unlike the first embodiment, the pipeline line 14 is not Y-shaped, and neither the second line nor the shaft second line is provided in this embodiment. The excavator 1 excavates by means of a pipeline line 14 , a first line 15 and a shaft first line 25 . When the new propulsion pipe 30 is carried into the starting shaft 2 (propulsion pipe carrying-in first process), the first line 15 is retracted (first line retraction process).

Since there is one excavator line, in order to pass this excavator line through a new propulsion pipe 30, it is cut (first line cutting step) and connected (first line connecting step). is circulated (preparation for excavation by the excavator), excavation by the thrust jack 13 of the excavator 1 (thrust jack excavation process) cannot be performed.
In addition to these processes, the thrust jack excavation process is performed in the original pushing jack releasing process, the first propulsion pipe carrying-in process (including the first line evacuation process), and the second propelling pipe carrying-in process.

Next, referring to FIG. 17, the excavation process of the conventional construction method and the present embodiment will be described.
FIG. 17(a) is a time chart of the excavation process of the prior art, which is the same as FIG. 15(a), and the cycle time is 176.5 minutes.

Next, the time chart of the present embodiment will be described with reference to FIG. 17(b). Before that, the distance for the thrust jack excavation process, in other words, the working stroke of the thrust jack 13 is set. In the thrust jack excavation process, a period during which the thrust jack excavation process can be performed is set within a period from when the main pushing jack device 20 is released until excavation becomes possible again by the main pushing jack device 20.例文帳に追加.
Specifically, it is a period during which the following steps are performed.

・Original push jack release process (10 min)
・Second line evacuation process (5 min) and first propulsion pipe loading process (20 min)
・Propulsion pipe loading 2nd process (10 min)

These are 40 min (performed together with the thrust jack excavation process using the first line 15).
Since the jack speed is 20 mm/min, the excavation length for the thrust jack excavation process is 0.8 m. Therefore, the remaining 1.63 m is excavated in the original pushing jack excavation process.

In addition, since the first line cutting process, the first line connecting process, and the preparation for excavation by the excavator are performed between the first process of carrying in the propulsion pipe and the second process of carrying in the propulsion pipe, the thrust jack excavation process is performed during this period. will be interrupted. Since the latter half of the thrust jack excavation process is performed in parallel with the second propulsion pipe loading process (10 min), the excavation length is 0.2 m. ) (including the second line evacuation process), the first half of the thrust jack excavation process is 0.6 m.

FIG. 17(b) is a time chart of the excavation process of the present embodiment, showing the start of the main pushing jack excavation process as the base point of 0 min.

In the main push jack excavation process, the propulsion pipe 30 excavates 1.63 m in 81.5 minutes.

After the main thrust jack excavation process is completed, the thrust jack excavation process (for 0.6 m in the first half) is performed, and the following processes are performed.
・Original push jack release process (10 min)
・First line evacuation process (5 min) and first propulsion pipe loading process (20 min) (Fig. 16)

After the first half of the thrust jack excavation process (30 minutes) for 0.6 m is completed, the following processes are performed. During this time, the thrust jack excavation process is suspended.
・First line cutting step and first line connecting step (5 min)
・Excavator excavation preparation (5 min)

When the preparation for excavation by the excavator is completed, the thrust jack excavation process (10 minutes) for 0.2 m in the latter half is resumed, and the second process (10 minutes) for carrying in the propulsion pipe is performed.

After the thrust jack excavation process, the propulsion tube group pushing process (7.3 minutes for 0.8 m) is performed, and the preparation for excavation by the excavator (5 minutes) is performed.

Therefore, in the present embodiment, the thrust jack excavation process takes 81.5 minutes, the first half thrust jack excavation process takes 30 minutes, the interruption of the thrust jack excavation process takes 10 minutes, the latter half thrust jack excavation process takes 10 minutes, and the propelling tube group pushing process. is 7.3 minutes, the cycle time is 138.8 minutes, and the cycle time can be shortened by about 38 minutes.

[Other Modifications]
The present invention is not limited to the above embodiments. Examples include:

In the present embodiment, the excavator line is moved to the bottom portion of the starting shaft 2 for retraction of the excavator line, but the present invention is not limited to this. Any position that does not impair the function of the excavator line and does not interfere with the mounting of the new propulsion pipe 30 on the starting frame 22 may be used.

In the first embodiment, the second line connection step of connecting the second line 16 is performed together with the thrust jack excavation step, but the present invention is not limited to this. The second line connecting step may be performed together with the second propelling pipe carrying-in step, the propelling pipe bundle pushing step, and the main pushing jack propelling step.

It is good also as an example by applying each technical matter in any embodiment to other embodiments.

1 Excavator 2 Starting Shaft 3 Propulsion Tube Group 4 Front Body 5 Rear Body 10 Rotating Cutter 11 Driving Part 12a Rear Body Outer Shell 12b Rear Body Inner Shell 13 Thrust Jack 14 Pipe Line 14a Power/Communication Line 14b Mud Transfer Pipe 14c Sludge drain pipe 15 First line 16 Second line 17 Pipe first valve 18 Pipe second valve 20 Main pushing jack device 21 Starting wellhead 22 Starting pedestal 25 Vertical shaft first line 26 Vertical shaft second line 27 Vertical shaft first Valve 28 Vertical Shaft No. 2 Valve 30 Propulsion Pipe

Claims (7)

A jacking method in which an excavator is provided in front and the rear end of a group of propelling pipes connected to the propelling pipe is pushed by extension of a main pushing jack to install the group of propelling pipes in the ground,
The excavator has a thrust jack capable of excavating by extending and pressing the rear propulsion pipe,
a thrust jack excavation step in which the excavator excavates by pressing the rear propulsion pipe by extension of the thrust jack;
a main push jack excavation step of pushing the propulsion pipe group by extension of the main push jack and excavating with the excavator;
a primary pushing jack releasing step in which the primary pushing jack does not press the propulsion tube group ,
The thrust jack excavation process is performed in parallel with the original push jack release process using the frictional resistance of the ground generated on the outer peripheral surface of the propulsion tube group as a propulsion reaction force,
The frictional resistance as the propulsion reaction force in the thrust jack propulsion process includes the frictional resistance obtained by a movable frictional resistance mechanism provided on the outer peripheral surface of the propulsion pipe of the propulsion pipe group.
A jacking method characterized by: A jacking method in which an excavator is provided in front and the rear end of a group of propelling pipes connected to the propelling pipe is pushed by extension of a main pushing jack to install the group of propelling pipes in the ground,
The excavator has a thrust jack capable of excavating by extending and pressing the rear propulsion pipe,
a thrust jack excavation step in which the excavator excavates by pressing the rear propulsion pipe by extension of the thrust jack;
a main push jack excavation step of pushing the propulsion pipe group by extension of the main push jack and excavating with the excavator;
a primary pushing jack releasing step in which the primary pushing jack does not press the propulsion tube group ,
The thrust jack excavation process is performed in parallel with the original push jack release process using the frictional resistance of the ground generated on the outer peripheral surface of the propulsion tube group as a propulsion reaction force,
During the thrust jack propulsion step, the main thrust jack is extended to the rear end of the propulsion tube group, and the propulsive force transmitted from the thrust jack through the propulsion tube group is transferred to the main thrust jack. Detecting the load and confirming whether or not the propulsion reaction force in the thrust jack excavation process can be obtained
A jacking method characterized by: a propulsion pipe carrying-in step of carrying a propulsion pipe between the propulsion pipe group and the original pushing jack;
The propulsion pipe carrying-in step includes:
a first step of carrying in the propulsion pipe, in which the propulsion pipe is mounted on a starting frame provided in a starting vertical shaft;
a second propulsion pipe carrying-in step of pressing the propulsion pipe placed on the starting platform by the main pushing jack and bringing it into contact with the propulsion pipe group;
The jacking method according to claim 1 or 2 , wherein the first step of carrying in the propelling pipe and the second step of carrying in the propelling pipe are performed in parallel with the thrust jack excavation step. the excavator comprises an excavator line coupled for drilling;
a line retracting step of retracting the excavator line from behind the propulsion tube group to a position in front of the main pushing jack and not interfering with placement of the propulsion pipe in the first propulsion pipe carrying-in step; prepared,
The jacking method according to claim 3, wherein the line evacuation step is performed in parallel with the first step of carrying in the propelling pipe. a line cutting step of cutting the excavator line retracted in the line retracting step;
The jacking method according to claim 4, wherein the second step of carrying in the propelling pipe is performed after the step of cutting the line. The excavator has two lines, each including a first line and a second line, which are connected for excavation, and
a line retracting step of retracting the second line from behind the group of propulsion tubes to a position in front of the main pushing jack and not interfering with placement of the propulsion tubes in the first propulsion tube carrying-in step; ,
The jacking method according to claim 3, wherein the line evacuation step is performed in parallel with the first step of carrying in the propelling pipe. a second line cutting step of cutting the second line retracted in the line retracting step;
During the second line cutting step, the thrust jack digging step is performed by the first line,
The jacking method according to claim 6, wherein the second step of carrying in the propelling pipe is performed after the step of cutting the second line.

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