JP2863492B2 - Propulsion method, excavation device and propulsion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method, a digging device, and a propulsion device, and more particularly to a propulsion method for burying a buried pipe by propelling it into the ground, and a digging device and a propulsion device used for such a propulsion method. About.

[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] Buried pipes such as sewers are often laid along roads to bypass the underground of buildings and the like. For this reason, the construction route of the buried pipe may be curved along the curve or bend of the road. Propulsion construction along a curved path may be particularly referred to as curved propulsion. As mentioned above, 1
As the propulsion distance in the process increases, the number of constructions in which both a straight portion and a curved portion are included in one process increases.

[0005] In the propulsion method including a curved route, construction conditions are greatly different between a curved portion and a straight portion. In the curved portion, the straight tubular buried pipe is propelled along the curved path, so that not only the axial component but also the diagonal and lateral components of the external force applied to the buried pipe are increased. A biased force may be applied only to a part of the buried pipe in the circumferential direction. There is also a high possibility that a gap or gap may occur in the joint between the front and rear buried pipes.

Therefore, the buried pipe used in the curve propulsion method is
A pipe material mainly composed of a steel pipe is used. Such a steel pipe material has higher mechanical strength and deformation resistance than fume pipes and the like generally used in the linear propulsion method, and is suitable for curved propulsion construction with a small radius of curvature that bends at sharp angles. It is possible. In addition, by shortening the total length of each buried pipe, it is possible to improve the strength and deformation resistance relatively, and to reduce the occurrence of uneven gaps generated at the connection part, so that it can respond to curve propulsion. Done. Therefore, the steel pipe material used as the buried pipe for curved propulsion as described above is often shorter than the buried pipe used for the straight section.

[0007] Further, a cushion material or a wedge material for filling uneven gaps due to bending may be arranged at a joint between the buried pipes, or a direction correcting mechanism for forcibly bending the front and rear buried pipes may be incorporated. Has also been done. A general condition of the curve propulsion construction that requires the use of the steel pipe material for curve propulsion as described above is when the radius of curvature is about 50 times or less the nominal diameter of the buried pipe. With such a small radius of curvature, it is difficult to cope with a fume pipe assuming ordinary straight construction.

[0008]

However, the steel pipe material for curved construction as described above has a drawback in that the production is troublesome and the cost is high. In addition, if buried pipes with a shorter overall length are used to support curved propulsion, the number of buried pipes required in one process will increase, and labor and time for carrying in and connecting will increase, reducing construction efficiency and cost. Also increase. Providing a mechanism such as a cushioning material for the above-mentioned curved construction requires a correspondingly high cost and an increase in labor such as connection work.

For example, in the case where a short curved portion and a long straight portion are included in one step of the propulsion construction, the use of the above-described curve-corresponding steel pipe or the like in accordance with the construction of the short curved portion. The use of buried pipes having excessive quality or unnecessary functions is uneconomical and causes an increase in the overall construction cost. For example, in the case of a J-shaped route in which one step of the propulsion construction is a combination of a fixed distance curved portion and a fixed distance linear portion, a starting shaft is disposed at the end of the straight portion side, Finally, steel pipe material suitable for curve propulsion is used only for the buried pipe connected to the side near the excavation device buried in the curved portion, and the rear side of the buried pipe row far from the excavation device passes only the straight portion, so A method of connecting fume tubes has been proposed.
By using the steel pipe material for curve construction only for the buried pipe that passes or is buried in the curved part near the reaching shaft, the use amount of the steel pipe material is reduced, and the construction cost can be reduced.

However, the above method cannot be applied to an S-shaped path having curved portions at both ends of a straight portion. This is because all buried pipes are propelled through the curved portion, regardless of which end of the path starts construction. In addition, the J
Even in the case of a character-shaped path, there is a case where the starting shaft cannot be arranged at the end on the straight portion side. In the starting shaft, it is necessary to arrange a main push jack or to install a buried pipe supply or earth removal facility, etc., so a large site is required, and depending on the construction conditions, the end of the straight part side It may not be possible to set up a starting shaft.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce construction cost and improve work efficiency while securing necessary strength in a propulsion construction in which a curved portion and a straight portion are mixed.

[0012]

The propulsion method according to the present invention is a propulsion method in which a buried pipe connected to the back of a digging device is propelled into the ground together with the digging device and buried. A digging device capable of converting the digging outer diameter into at least two stages, large and small, is used. It includes a first step and a second step.
In the first step, starting from the propulsion start position, in the first section including the curved portion, the large-diameter buried pipe capable of curvilinear propulsion is located behind a digging device set to a digging outer diameter corresponding to the outer diameter of the large-diameter buried pipe. The large-diameter buried pipes will be buried by applying propulsion to the excavation device and the large-diameter buried pipes and propelling them into the ground.
In the second step, in the second section including the straight section following the first section, a small-diameter buried pipe smaller in diameter than the large-diameter buried pipe is passed through the inside of the large-diameter buried pipe from the propulsion start position and is positioned behind the excavation device. , The excavation outer diameter of the excavation device is set to the outer diameter corresponding to the outer diameter of the small-diameter buried pipe, and the propulsion force is applied to the excavation device and the small-diameter buried pipe to be propelled into the ground to bury the small-diameter buried pipe. I will do it.

The individual components will be specifically described. [Buried pipes] Buried pipes of various materials and applications to which the 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.

According to the present invention, at least two types of buried pipes having different outer diameters are used, and buried pipes having dimensions that allow the small-diameter buried pipe to pass through the inside of the large-diameter buried pipe are combined. The large-diameter buried pipe has a material and a dimensional shape suitable for curve propulsion construction. For example, a steel pipe mainly composed of a steel material is preferable. The steel pipe may be composed of only a steel material, or may be a steel material in which a layer of concrete, mortar, synthetic resin, or the like is laminated. The length of the large-diameter buried pipe is preferably relatively short so that it can be easily adapted to curved propulsion. The end face of the large-diameter buried pipe may be provided with a cushion material, a wedge material, a direction correcting mechanism, or the like that fills a joint portion during curve propulsion.

Among the large-diameter buried pipes, a large-diameter buried pipe to which a propulsion device for a small-diameter buried pipe described later is mounted is provided with a mounting mechanism for the propulsion apparatus. Small-diameter buried pipes shall be of a material and size and shape suitable only for straight-line propulsion construction, if the buried pipe is at a place where the curved part is not propelled during the propulsion construction Is used. In this case, for example, a fume tube mainly composed of concrete is preferable, and its overall length may be relatively long. However, even in this case, it is necessary to have a dimensional shape capable of passing through the inside of the large-diameter buried pipe arranged in the curved portion.

In the case of a small-diameter buried pipe on which curved propulsion construction is performed, it is necessary to have a pipe material and dimensions, such as a steel buried pipe, compatible with curve propulsion construction, like the large-diameter buried pipe. Therefore, as the small-diameter buried pipe, both a buried pipe dedicated to straight line construction and a buried pipe corresponding to curved construction may be used in combination as needed.

The buried pipe is provided with a connection structure for connecting the buried pipes and a structure for connecting the buried pipe to a digging device, like the buried pipe for a normal propulsion method. [Drilling device] The digging device has the same basic structure as a normal digging device, but the outer diameter of the digging device is at least 2
Can switch to stages. The excavation outer diameter corresponds to the outer diameter of a burial hole formed by excavating the ground with an excavation device and propelled by the excavation device. Usually, the outer diameter of the entire excavation device and the excavation diameter at which the ground is excavated by the excavation device are the excavation outer diameter. However, when the ground is compacted to the outer periphery of the excavation device to form a buried hole larger than the excavation diameter, the excavation diameter may not coincide with the excavation outer diameter.

The excavation outer diameter must be convertible into two stages, a large diameter corresponding to the outer diameter of the large-diameter buried pipe and a small diameter corresponding to the outer diameter of the small-diameter buried pipe. In order to change the outer diameter of the excavation, the excavation device can be constituted by a cylindrical main body and a fitting insertion tube. The basic structure of the tubular main body is the same as that of a normal 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 small-diameter 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 small-diameter 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. If the cylindrical main body is divided into front and rear and connected between them by a deflection mechanism consisting of a plurality of telescopic cylinder mechanisms,
The front and rear of the tubular body can be bent in accordance with the curved path to be propelled.

The insertion tube has an inner diameter equal to or slightly larger than the outer diameter of the tubular main body, and an outer diameter equal to or slightly larger than the outer diameter of the large-diameter buried pipe, and is used for steel materials and other buried pipes. It consists of a hollow cylinder made of the same material as. 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 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.

The insertion tube body may be provided with a digging device and a deflecting mechanism for changing the propulsion direction 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.

A deflecting mechanism is provided on the side of the cylindrical body divided into the front and the rear, and even if the inserted insertion cylinders divided into the front and the rear are only attached to the respective inner cylindrical bodies, The entire device can be turned back and forth. Excavation means Basically, an excavation mechanism provided with a cutter and a cutter drive mechanism similar to a normal excavation 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 sectional area determined by the arrangement of excavating tools such as cutters. The outer diameter of the cross-sectional area to be excavated, that is, the outer diameter of the excavation can be selectively changed in two stages, large and small. Specifically, a first outer diameter corresponding to the outer diameter of the cylindrical main body, that is, the outer diameter of the small-diameter buried pipe, and a second outer diameter corresponding to the outer diameter of the fitting insertion cylinder, that is, the outer diameter of the large-diameter buried pipe. And diameter. Corresponding here means not only when it completely matches the outer diameter of the cylindrical main body or the fitting insertion cylinder, but also
This includes a case where the size is made larger or smaller at a fixed ratio with respect to the outer diameter of the cylindrical main body or the fitting insertion tube.

The digging means may include a mobile digging tool for selectively moving between a position corresponding to the outside diameter of the large diameter buried pipe and a position corresponding to the outside diameter of the small diameter buried pipe. 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 device] The propulsion device is installed inside the large-diameter buried pipe placed at the head of the large-diameter buried pipe row to be buried, and applies propulsion to the rear end of the small-diameter buried pipe to work with the excavation device and the small-diameter buried pipe. Into the ground in front of the large-diameter buried pipe.

The propulsion device is provided with a propulsion means including a jack mechanism or a piston cylinder mechanism or the like similar to a main push jack or the like, and abuts on the rear end of the small-diameter buried pipe to apply a propulsion force by pressing in the propulsion direction. The propulsion means has a structure that can be selectively arranged in a retracted state in which the small-diameter buried pipe can pass through the inside of the large-diameter buried pipe on which the propulsion device is mounted, and in a propelled state in which the small-diameter buried pipe can be propelled. Specifically, the propulsion means may be movably mounted between the propulsion state and the retracted state. The movement of the propulsion means can be a combination of linear movement, parallel movement, turning movement, etc., in the forward and backward and left and right directions. The entire propulsion means may move, or only a portion that may obstruct passage of the small-diameter buried pipe may move. The structural part of the propulsion means that does not hinder the passage of the small-diameter buried pipe may not be configured to be movable.

The propulsion device is provided with a reaction force support means which is fixed to the large diameter buried pipe and receives a reaction force applied from the small diameter buried pipe. As the reaction force supporting means, a part of the propulsion means is fixed to a receiving member fixed to the large-diameter buried pipe side, or a receiving member which comes into contact with a part of the propulsion means only at the time of propulsion operation of the propulsion means. It can be provided in a large diameter buried pipe. The reaction force support means is also in a retracted state that does not hinder the passage of the small diameter buried pipe,
It is possible to make it possible to shift to and from a propulsion state receiving a reaction force from the propulsion means.

[Propulsion Method] The propulsion method according to the present invention can be carried out by using a digging device or a propulsion device having the above configuration. <First Step> Applied to the first section starting from the propulsion start position and including the curved portion. The first step is basically the same as the ordinary curve propulsion method. The propulsion start position is provided in the starting shaft. The outer diameter of the excavation device is made to correspond to the outer diameter of the large-diameter buried pipe, and the large-diameter buried pipe is sequentially connected to the rear thereof. If the excavating device is propelled into the ground, the large-diameter buried pipe is propelled through the ground and buried along with the excavating device. The propulsion of the excavation device and the large-diameter buried pipe can be applied by applying thrust to the rear end of the large-diameter buried pipe with a main jack or the like arranged in the starting shaft. In the starting shaft, new large-diameter buried pipes are sequentially connected to the rear end of the large-diameter buried pipe row.

The first section may include only a curved portion starting from the propulsion start position, or may include a relatively short straight line portion before, after, or in the middle of the curved portion. <Second step> The second step is applied to a second section including a straight line portion following the first section. The second section may include only a straight line portion, or may have a curved portion following a relatively long straight line portion. In the case where the second section is composed of only straight sections, a pipe that is difficult to cope with curved construction such as a fume pipe can be used as the small-diameter buried pipe.

In the second step, the small-diameter buried pipe is propelled and buried. The outer diameter of the excavation device is set to an outer diameter corresponding to the outer diameter of the small-diameter buried pipe. Specifically, for example, the fitting insertion tube body and the cylindrical main body may be separated, and the movable excavating tool may be operated to reduce the excavation outer diameter. From the propulsion start position, the small diameter buried pipe passes through the inside of the already buried large diameter buried pipe, is transported to the rear of the excavation device, and is connected to the rear of the excavation device. In this state, if the excavating device is further propelled into the ground, small-diameter buried pipes are sequentially propelled and buried.

In the case where the excavating device is composed of a cylindrical main body and a fitted insertion tube, when the excavating device, that is, the cylindrical main body is propelled, the fitted insertion tube remains with the large-diameter buried pipe row in the ground. It is. In the second step, a propulsion device mounted on the large-diameter buried pipe is used to transmit the propulsion force to the excavation device and the small-diameter buried pipe. When the small-diameter buried pipe passes through the position of the propulsion device mounted on the large-diameter buried pipe, the propulsion means of the propulsion device is disposed in a retracted state. After the small-diameter buried pipe is placed at a predetermined position near the head of the large-diameter buried pipe, the propulsion means is shifted to a propulsion state and abuts on the rear end of the small-diameter buried pipe.

When a propulsion force is applied to the excavating device and the small-diameter buried pipe by the propulsion means, the reaction force acts on the propulsion means. This reaction force is received by the reaction-force supporting means fixed to the large-diameter buried pipe. . As the propulsion progresses, new small-diameter buried pipes are sequentially added to the rear of the small-diameter buried pipe and propelled.

When the mixed second section including the straight portion and the curved portion includes the straight portion and the curved portion subsequent to the straight portion, the first small-diameter buried pipe suitable for curve construction is used as the small-diameter buried pipe. It is preferable to use a second small-diameter buried pipe suitable for straight-line construction. As the first small-diameter buried pipe, a steel pipe or the like corresponding to curved construction is preferable, and as the second small-diameter buried pipe, a fume pipe or the like not compatible with curved construction is used.

First, a first small-diameter buried pipe is sequentially connected and propelled behind the excavating device. The first small-diameter buried pipe is connected by a length corresponding to the entire length of the curved portion. Thereafter, the second small-diameter buried pipe is sequentially connected to the rear end of the first small-diameter buried pipe and propelled. When the excavating device drives the curved portion via the straight portion and reaches the reaching shaft which is the propulsion end position, the first small-diameter buried pipe is buried in the curved portion, and the second small-diameter buried pipe is buried in the straight portion. It will be buried.
Note that the first small-diameter buried pipe is propelled along a curved portion through a straight portion together with the excavating device, while the second small-diameter buried pipe is
It can only be propelled to straight sections. Therefore, there is no problem even if the second small-diameter buried pipe is a fume pipe or the like that does not support curve construction.

[Operation] According to the above-described propulsion method, even if a curved part and a straight part are mixed in one process from the starting shaft to the reaching shaft, the straight part is particularly curved. A small-diameter buried pipe made of a normal fume pipe or the like that does not correspond to the above can be used. As a result, the manufacturing cost and the construction cost of the buried pipe are reduced as compared with the case where a steel pipe or the like corresponding to the curved construction is used for all the routes. In the first step, the small-diameter buried pipe such as a fume pipe passes through the inside of the large-diameter buried pipe at a curved portion. However, at this time, the ground is merely propelled and the ground cannot be propelled.
A large load is not applied even when passing through the curved portion.
Also, even if a large gap or a skewed gap is generated between the small-diameter buried pipes passing through the curved portion, there is no problem because it is inside the large-diameter buried pipe.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to a case in which propulsion is performed along an S-shaped path shown in FIG. As shown in FIG. 1, a buried pipe is constructed between the starting shaft 1 and the reaching shaft 2. A substantially semi-circular curved path is disposed in a portion adjacent to the shafts 1, 2, and a relatively long straight path is disposed in the middle thereof, and the whole constitutes an S-shape. As a specific example of the dimensions, the curved paths at both ends are set to a radius of curvature of 20 m, and the distance of the intermediate straight line portion is set to 270 m. The starting shaft 1 is excavated to a width of 5.2 m and a depth of 8 m, and the reaching shaft 2 is excavated to a width of 4 m and a depth of 6 m.

[Drilling Device] As shown in FIGS. 2 and 3, the digging device has a cylindrical main body 10 and fitting cylinders 32 and 34 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 is changed to correspond to curved construction.

An excavating mechanism 20 is provided at the tip of the front part 12 of the cylindrical main 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 FIGS. 3 and 5, 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. As shown in FIGS. 2 and 3, in a state where the movable cutter 25 protrudes outward from the rotary excavator 22,
The outer diameter of the movable cutter 25 substantially matches the outer diameter of the insertion cylinders 32 and 34.

Behind the rotary excavator 22, the rotary excavator 2
2 is provided. The rotation of the motor 24 rotates the rotary excavator 22 to excavate the ground in front.
A mud pipe 17 is connected to the back space of the rotary excavator 22 to supply water or muddy water from the rear or to send back the excavated earth and sand together with the muddy water to facilitate excavation of the ground. Efficiently discharges excavated earth and sand.

Although not shown, the tubular 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.
As shown in FIG. 5, a small-diameter buried pipe 40 made of a fume pipe or the like 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 small-diameter buried pipe 40 are substantially the same. As an example of the dimensions of the small-diameter buried pipe 40, a pipe having a diameter of about 1650 mm is used.

As shown in FIG. 2, the fitting cylinders 32 and 34 having an inner diameter substantially fitted to the outer periphery of the tubular main body 10 are hollow double tubes made of steel. The fitting insertion cylinders 32 and 34 are fixed to the front part 12 and the rear part 14 of the cylindrical main body 10 by fixing pins 3 and 35 each having 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 fitting insertion tube 32 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 fitting insertion tube bodies 32 and 34 is
It substantially coincides with the outer diameter of the movable cutter 25 at the projecting position. A large-diameter buried pipe 50 made of a steel pipe is connected to the rear end of the insertion cylinder 34. The outer diameters of the fitting insertion tube 34 and the large-diameter buried tube 50 are substantially the same. As an example of the dimensions of the large-diameter buried pipe 50, a pipe having a diameter of about 2700 mm is used.

[Propulsion Device] As shown in FIGS. 6 to 9, the propulsion devices 60 are mounted on the inner surface of the large-diameter buried pipe 50 at positions diametrically opposed to each other. Propulsion device 60
Are three cylindrical propulsion jacks 6 arranged in parallel.
4 is attached to the inner surface of the large-diameter buried pipe 50 via a reinforcing flange 62 at the rear end. Each of the propulsion jacks 64 has a forward / backward movable tip 65 that is operated by hydraulic pressure or pneumatic pressure. Tip portions 65 of three propulsion jacks 64
Are connected to the pressing member 66. As shown in FIG. 7, the pressing member 66 has an arc shape.

The propulsion jack 64 is rotatably attached to the reinforcing flange 62, and can rotate from the position along the inner surface of the large-diameter buried pipe 50 to the center side as shown in FIGS. . When the distal end 66 is advanced from the propulsion jack 64, the pressing member 66
Is a small-diameter buried pipe 40 arranged inside the large-diameter buried pipe 50.
Abuts the rear end of the

The propulsion device 60 is used in the second step of propelling the small-diameter buried pipe 40, and is not necessary in the first step of propelling the large-diameter buried pipe 50. Therefore, during the first step, the propulsion device 60 is not mounted, and after the first step is completed,
The propulsion device 60 may be attached near the top of the large-diameter buried pipe 50. [Propulsion method] In FIG. 1, a section from the starting shaft 1 to the end of the first curved section is a first section I, and a section including the straight section and the curved section following the first section I and reaching the reaching shaft 2 is a section. This is the second section II.

<First Step> FIG. 4 shows a propulsion step in the first section I, that is, a first step. As shown in FIG. 2, the excavation device 4 includes an insertion cylinder 32 fitted around the outer periphery of the cylindrical main body 10,
The movable cutter 25 is extended outward. The ground is excavated from the side wall of the starting shaft 1 by the excavating device 4 and propelled. The propulsion of the digging device 4 applies thrust to the rear end of the digging device 4 with the main pushing jack 3 arranged in the starting shaft 1.

A large-diameter buried pipe 50 made of a steel pipe is connected to the rear end of the excavating device 4, and a propulsion force is applied to the rear end of the large-diameter buried pipe 50 by the main pushing jack 3. The large-diameter buried pipe 50 connected immediately after the excavation device 4 has a propulsion device 60 inside as shown in FIG. A reinforcing rib protrudes from the inner surface of the large-diameter buried pipe 50. Next, a new large-diameter buried pipe 50 is sequentially connected to the rear end of the 50 rows of large-diameter buried pipes, and the operation of propelling with the main pushing jack 3 is sequentially repeated, whereby the 50 rows of large-diameter buried pipes are propelled into the ground. Will be done.

In the first step, the propulsion path of the 50 rows of large-diameter buried pipes is curved. For this purpose, in the excavating device 4, the direction correcting jack 13 is operated, and the front portion 1 of the tubular main body 10 is moved.
2 and the rear part 14 are bent according to a predetermined curvature. The insertion cylinders 32 and 34 also bend according to the front part 12 and the rear part 14. When the bent excavating device 4 is propelled, the excavating device 4 is propelled along a curved path, and the 50 rows of large-diameter buried pipes are also propelled along the curved path. Large diameter buried pipe 50
Since a gap may be formed in the end face of the large-diameter buried pipe 50 between joints, a seam member or the like that fills the gap may be attached.

The excavating device 4 passes the first section I and the second section
Upon entering II, the first step is completed. <Second Step> When the excavation device 4 enters the second section II, the connection between the cylindrical main body 10 and the fitting insertion cylinders 32 and 34 is released in FIG. Specifically, the bolt and nut connecting the fixing pins 33, 33 may be removed. The movable cutter 25 is moved to the center side so that the outer diameter of the excavation is adjusted to the outer diameter of the cylindrical main body 10.

As shown in FIG. 1, the small-diameter buried pipe 40 is fed from the rear end of the large-diameter buried pipe 50 opening into the starting shaft 1.
Since the small-diameter buried pipe 40 connected at this stage is finally buried in a curved portion, the steel pipe 40b corresponding to the curved propulsion is used.
Is used. The small-diameter buried pipe 40b passes through the central space of the 50 rows of large-diameter buried pipes arranged in a curve, and
Transported to the rear. The transfer may be performed manually, or may be performed mechanically by installing a roller conveyor inside the large-diameter buried pipe 50. As shown in FIG. 7, if the transport roller 52 is provided on the bottom side of the large-diameter buried pipe 50, the small-diameter buried pipe 40b can be easily transported.

As shown in FIG. 6, when the small-diameter buried pipe 40b passes through the large-diameter buried pipe 50 provided with the propulsion device 60,
The propulsion device 60 is disposed in a retracted state that does not hinder the passage of the small-diameter buried pipe 40b. As shown in FIG. 5, a small-diameter buried pipe 40 b is
Concatenate. Thereafter, as shown in FIG.
The tip 65 is advanced forward with the propulsion jack 64 slightly rotated toward the center line. The pressing member 66 contacts the rear end of the small-diameter buried pipe 40b. As shown in FIG.
When the distal end 65 of the propulsion jack 64 is further advanced,
The small diameter buried pipe 40b is propelled by the pressing member 66. The tubular main body 10 is also propelled together with the small-diameter buried pipe 40b. The cylindrical body 10 excavates the ground while propelling. The reaction force generated when the pressing member 66 of the propulsion jack 64 propels the small-diameter buried pipe 40b is received by the large-diameter buried pipe 50 via the reinforcing flange 62 connected to the rear end of the propulsion jack 64.

When the tubular body 10 is propelled, the tubular body 10
Are left behind.
As shown in FIG. 1, the row of the cylindrical main body 10 and the small-diameter buried pipe 40b connected to the rear thereof are sequentially propelled in the ground. At this stage, since the cylindrical main body 10 is propelled along the straight path, the cylindrical main body 10 in the first step described above is used.
No bending operation is required.

After one small-diameter buried pipe 40b is propelled by a predetermined distance, the propulsion device 60 is returned from the extended state shown in FIG. 9 to the original retracted state shown in FIG. When the propulsion device 60 returns to the retracted state, the next small-diameter buried pipe 40b
Is connected to the rear end of the small-diameter buried pipe 40b that has been propelled earlier. The small-diameter buried pipes 40b are sequentially conveyed from the starting shaft 1 to the leading end of the 50-row large-diameter buried pipes, connected to the rear ends of the rows of the tubular main body 10 and the small-diameter buried pipes 40b, and propelled into the ground. . By repeating such operations, the tubular main body 10 and the small-diameter buried pipe 40b are propelled as shown in FIG.

<Second Step (Curved Portion)> As shown in FIG. 10, the second section II includes a straight portion IIA followed by a curved portion II.
B is located. When the cylindrical main body 10 enters the curved portion IIB, the front part 1 of the cylindrical main body 10 is moved in the same manner as in the first step.
2 and the rear part 14 are bent and propelled along a curved path. Since the small-diameter buried pipe 40b uses a steel pipe corresponding to curved propulsion, it is smoothly propelled along a curved path.

The small-diameter buried pipe 40 connected to the cylindrical main body 10
When the row b has a length corresponding to the distance of the curved portion IIB, the next step is to connect the small-diameter buried pipe 40a for linear propulsion consisting of a fume pipe. Thereafter, by repeating the same operation as described above, the tubular main body 10 reaches the arrival shaft 2,
A small-diameter buried pipe 40a made of a steel pipe is buried in the curved portion IIB, and a small-diameter buried pipe 40b made of a fume pipe is buried in the straight portion IIA. As described above, in the first section I,
A large-diameter buried pipe 50 made of a steel pipe is buried.

In this way, all the sections I, IIA, II
Buried pipes 50, 40a, and 40b are buried in B. The cylindrical main body 10 that has entered the reaching shaft 2 is separated from the subsequent buried pipe 40b and removed from the reaching shaft 2. The excavation device 4
Of the members constituting the above, the fitted insertion cylinders 32 and 34 remain buried in the ground at the leading end of the large-diameter buried pipe 50. In the case of repeatedly using the insertion cylinders 32 and 34, the tubular main body 10 of the excavating device 4 is separated from the insertion cylinders 32 and 34, and then the insertion cylinders 32 and 34 are disassembled to remove the large-diameter buried pipe. What is necessary is just to take out through 50.

In the above-described propulsion method, the longer the distance between the straight portions IIA, the greater the ratio of fume pipes which are low-cost and easy to handle, so that the effect of reducing the construction cost is increased. [Other Embodiments] (a) As the construction route of the propulsion method, in addition to the S-shaped route as in the illustrated embodiment, an arbitrary route in which a curved portion and a straight portion are combined is applied. For example, the present invention can be applied to a J-shaped path and a U-shaped path.

(B) The structure of the propulsion device 60 is, as shown in the illustrated embodiment, a retreat by moving the propulsion jack 64 in parallel with the pipe axis direction, in addition to the propulsion jack 64 that rotates around the rear end. It may have a structure that shifts between the state and the propulsion state. The retracted state may be a position outside the outer diameter of the small-diameter buried pipe 40 or a position inside the small-diameter buried pipe 40.

To apply a propulsive force to the small-diameter buried pipe 40, the propulsion jack 64 is extended, and the small-diameter buried pipe 40 is pushed forward. Small diameter buried pipe 40 when contracted
Can be pushed forward. The propulsion jack 64 is disposed outside the small-diameter buried pipe 40, and only the pressing member 66 provided at the distal end portion 65 is moved between the position where the pressing member 66 abuts on the rear end of the small-diameter buried pipe 40 and the position outside the small-diameter buried pipe 40. It may be moved between.

[0061]

According to the propulsion method according to the present invention, the buried pipe to be propelled is changed between the first section including the curved section starting from the propulsion start position and the second section including the straight section following the first section. It is possible to use steel pipes and the like corresponding to curve construction for curved sections such as the first section, and use fume pipes and the like for straight construction that are relatively simple and inexpensive for the straight section of the second section. This makes it possible to reduce the cost of the entire propulsion work and improve the work efficiency without deteriorating the function in the curved portion.

The excavation device and the propulsion device according to the present invention can perform the above-mentioned propulsion method simply and reliably.

[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 an enlarged sectional view of a digging device.

FIG. 3 is a front view of a digging device.

FIG. 4 is a schematic sectional view showing a construction state of a first step.

FIG. 5 is an enlarged sectional view of the excavating device at the time of construction in the second step.

FIG. 6 is a cross-sectional view of a propulsion device mounted on a large-diameter buried pipe.

FIG. 7 is a sectional view in a direction orthogonal to the previous figure.

FIG. 8 is a sectional view of a propulsion state by the propulsion device.

FIG. 9 is a sectional view showing a state where propulsion is completed.

FIG. 10 is a schematic sectional view showing an end state of the propulsion construction.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 starting shaft 2 reaching shaft 3 main push jack 4 excavating device 10 tubular main body 20 excavating means 32, 34 fitting insertion tube 40 small diameter buried pipe 40a small diameter buried pipe (fume pipe) 40b small diameter buried pipe (steel pipe) 50 large diameter buried Pipe I 1st section II 2nd section IIA 2nd section (straight line section) IIB 2nd section (curved section)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/06 311

Claims (6)

(57) [Claims] 1. A propulsion method in which a buried pipe sequentially connected to the back of a digging device is propelled into the ground together with the digging device to bury the digging tube, and the digging outer diameter can be converted into at least two stages, large and small. In the first section including the curved portion starting from the propulsion start position and using the device, the large-diameter buried pipe capable of curving is set to the excavation outer diameter corresponding to the outer diameter of the large-diameter buried pipe. A first step of sequentially connecting rearward, applying a propulsive force to the excavating device and the large-diameter buried pipe, propelling it into the ground, and burying the large-diameter buried pipe; and a straight line following the first section. In the second section including the part,
A small-diameter buried pipe smaller than the large-diameter buried pipe passes through the inside of the large-diameter buried pipe from the propulsion start position and is sequentially connected to the rear of the digging device, and the digging outer diameter of the digging device is the small diameter. Setting the outer diameter corresponding to the outer diameter of the buried pipe, applying a propulsive force to the excavating device and the small-diameter buried pipe, propelling the buried pipe into the ground, and burying the small-diameter buried pipe. Propulsion method. 2. The propulsion method according to claim 1, wherein the large-diameter buried pipe is a steel pipe mainly composed of steel, and the small-diameter buried pipe is a fume pipe mainly composed of concrete. 3. The second section includes a straight line portion and a curved portion following the straight line portion, and the second step includes a first small diameter buried in the curved portion behind the excavating device. The method according to claim 1, further comprising the steps of sequentially connecting and propelling the buried pipes, and sequentially connecting and propelling a second small-diameter buried pipe buried in the straight portion behind the first small-diameter buried pipe. The described propulsion method. 4. The propulsion according to claim 3, wherein the first small-diameter buried pipe is a steel pipe mainly composed of steel, and the second small-diameter buried pipe is a fume pipe mainly composed of concrete. Construction method. 5. A digging device used in the propulsion method according to claim 1, wherein the small-diameter buried pipe is connected to a rear side of the digging apparatus and has a cylindrical shape having an outer diameter corresponding to the small-diameter buried pipe. A main body, which is detachably attached to the cylindrical main body so as to cover an outer periphery of the cylindrical main body, and the large-diameter buried pipe is connected to a rear side thereof, and a fitting insertion tube having an outer diameter corresponding to the large-diameter buried pipe. And a second body corresponding to the first outside diameter corresponding to the outside diameter of the tubular body and the second outside diameter corresponding to the outside diameter of the fitting insertion tubular body, which is disposed on the front side of the tubular body. A digging device comprising: a digging means that can be selectively set to an outer diameter. 6. A propulsion device used in the propulsion method according to claim 1, wherein the propulsion method is mounted inside the large-diameter buried pipe propelled in the first step, and the second step is performed. Propulsion means selectively disposed in a retracted state in which the small-diameter buried pipe can pass and a propulsion state in which a propulsion force is applied by abutting against a rear end of the small-diameter buried pipe connected to the rear of the excavating device. And a reaction force supporting means fixed to the large-diameter buried pipe and receiving a reaction force applied from the small-diameter buried pipe.