JP3525130B1 - Removal method of excavator in propulsion method - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To efficiently remove equipment such as an excavator used in a propulsion method in a form easy to use for the next propulsion work. An excavator (20) in which a plurality of divided cylinders (32, 34) are flexibly connected and a buried pipe (10) is connected rearward,
In the propulsion method for excavating and propelling the ground E from the starting shaft H to the reaching shaft M, the excavator 20 is removed from the ground E. Outer shell portion 30 of excavator 20
(A) of returning the drive mechanism unit 40, which has been disconnected from the starting shaft H to the starting shaft H through the inside of the 10 rows of buried pipes, and carrying it out of the starting shaft H to the ground;
A step (b) of carrying the divided members 52a and 52b obtained by dividing 0 into a plurality of parts from the reaching shaft M or the starting shaft H to the ground.
And the outer shell tube portion 30 is left in the ground E.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing an excavator in a propulsion method, and more specifically, in a propulsion method used for laying a sewer pipe, etc., the excavator used for the work is removed from the ground. Intended for removal methods.

[0002]

2. Description of the Related Art In the propulsion method, an excavator that has been propelled while excavating the ground with a buried pipe connected to the rear must be removed after the completion of the propulsion work. The excavator carried into the starting shaft is propelled from the inner wall of the starting shaft to the ground, and while excavating a tunnel in the ground, the buried pipe connected to the rear end of the excavator is drawn into the ground and laid. When the excavator is propelled to the reaching shaft, the excavator is removed from the laid buried pipe line, and the removed excavator is carried out from the reaching shaft to the ground. The excavator carried out is used for propulsion work at another work site.

Narrow manhole as a reaching shaft
When using the excavator, the excavator cannot pass through the human hole, so the excavator cannot be removed as it is. Therefore, various techniques have been proposed that enable removal of the machine even in such a case. In the technique of Patent Document 1, the excavation device having a diameter smaller than that of the facility pipe to be buried is housed inside the facility pipe and fixedly integrated to perform the propulsion work. When the excavator reaches the reaching shaft, the excavator, which has been fixed to the facility pipe on the outer peripheral side, is pulled back to the starting shaft and is carried out from the starting shaft to the surface of the earth. The starting shaft is wide and can be removed by passing it through the entire rig.

In the technique of Patent Document 2, the propulsion excavating device that has reached a narrow reaching shaft such as a human hole is disassembled into small members, and the disassembled members are sequentially carried out. The rotary excavation part for excavating the ground is divided into both a circumferential direction and a radial direction into small fan-shaped plate materials. Disassemble the electric motor and speed reducer into individual devices. The outer shell tube that constitutes the outer shell of the device is also divided into small pieces in the circumferential and axial directions. Divide all equipment parts so that they can be easily carried out even from human holes. After removing the outer shell pipe of the excavator, thrust is applied from the starting shaft to the buried propulsion pipe row, and the outer shell tube is removed to propel the propulsion pipe row up to the place where the ground is exposed to expose the ground. It is blocking the part.

In the technique of Patent Document 3, the outer shell of the excavation device is composed of a tubular skin plate made of the same material as the propulsion pipe such as a fume pipe. The excavator propelled to the reaching vertical shaft is disassembled into small members and carried out from the reaching vertical shaft. However, the skin plate that was the outer shell of the excavator is left on the ground to form the inner wall of the tunnel.

[0006]

[Patent Document 1] Japanese Patent Publication No. 7-68871

[0007]

[Patent Document 2] Japanese Patent Laid-Open No. 2002-322896

[0008]

[Patent Document 2] Japanese Patent No. 3380737

[0009]

The above-mentioned conventional technique also has a problem. For example, in the technique of Patent Document 1, only an excavator having a diameter smaller than the inner diameter of the facility pipe to be buried can be used. The internal space of the drilling rig is extremely small.
It becomes difficult to work inside the excavator, and it becomes impossible to install the equipment necessary for the work. In particular, it is difficult to apply it to a small diameter propulsion method. Moreover, there is a serious problem that the propulsion direction cannot be corrected or the curve propulsion cannot be performed.

Conventionally, in order to correct the propulsion direction of the excavator and to enable curved propulsion, the excavator is divided into front and rear parts, and the divided front and rear parts are connected by a direction correction jack,
A technique for bending an excavator by expanding and contracting a direction correcting jack is known. In the technique of Patent Document 1, since the entire excavation device is housed inside the facility pipe, even if the excavation device is bent, the propulsion direction cannot be changed at all. It is practically impossible to accurately perform the propulsion work for one section from the start shaft to the arrival shaft without modifying the propulsion direction. Therefore, with the technique of Patent Document 1, it is difficult to perform highly accurate propulsion work, and the practicality is poor.

According to the technique of Patent Document 2, it takes a great deal of time and effort to assemble the excavator which is disassembled into small members. When the excavation work of one section is completed, the excavator is transferred to the next work section and used again for the propulsion work. There is a long time required for the assembling work of the excavator after the completion of the propulsion work in one section and before the start of the propulsion work in the next work section. The efficiency of the entire propulsion work will be significantly reduced. In particular, in the excavator, the drive force transmission mechanism from the prime mover to the excavator via the reduction gear is disassembled once, and when reassembled, the center of rotation is accurately aligned or the rotational force is not adjusted. A high level of skill is required for the task of making fine adjustments to ensure smooth transmission. Even if there is a slight assembly error, vibration may occur during rotation, or the bearing structure may be damaged. Normally, reuse is not possible without performing a test operation for a certain period of time after reassembly to sufficiently confirm that normal operation is possible.

Further, in the technique of Patent Document 2, the propulsion pipe row is propelled to the exposed portion of the ground from which the excavation device has been removed to cover the exposed portion of the ground. Accurately propelling only one without damaging or deforming the propulsion tube is a very tricky task. The propulsion pipe at the top bites into the ground and is easily damaged or decentered. Also in the technique of Patent Document 3, the excavator other than the skin plate, the motor, the gear box, and the like are finely disassembled and carried out from the reaching shaft. Similar to Patent Document 2, reassembling requires a great deal of labor and time.

Further, in the technique of Patent Document 3, since a relatively thick pipe material such as a fume pipe is used for the outer shell of the excavator, the space available inside the excavator is narrowed. . It has the same drawbacks as Patent Document 1. A skin plate made of a fume tube or the like is inferior in toughness and durability as compared with a steel material generally used as an outer shell material for an excavator. There is a risk of damage or loss due to load. In particular,
When the bending operation using the direction correcting jack is performed, tensile stress and shear stress are inevitably generated in a part of the skin plate. The concrete that makes up the skin plate is strong against compressive stress but weak against tensile stress and shear stress, so
It is more likely to be damaged. It is necessary to provide a large number of structures such as mounting holes and mounting brackets for mounting the direction correction jack, excavation mechanism, rotary drive mechanism, etc. on the skin plate, which may reduce the strength and durability of the skin plate. is there. Of the inner wall of the tunnel, only the portion constituted by the skin plate becomes weaker than the other portions, and deterioration or damage is likely to occur over time.

An object of the present invention is to enable efficient removal of equipment such as an excavator used in a propulsion method in a form that is easy to use in the next propulsion work.

[0015]

A propulsion method according to the present invention is a propulsion method for propelling an excavator having a buried pipe connected to the rear thereof while excavating the ground from a starting shaft to a reaching shaft, wherein the excavator is A method of removing from the ground, wherein the excavator comprises an outer shell tubular portion having an outer diameter substantially the same as the outer diameter of the buried pipe, which is formed by flexibly connecting a plurality of divided tubular bodies. The excavator, which is disposed on the front surface of the outer shell tubular portion and is capable of being divided into a plurality of parts, and the drive mechanism portion which is housed inside the outer shell tubular portion and rotationally drives the excavation portion, The drive mechanism section, which is disconnected from the outer shell tube section, is rotationally driven from at least a drive source that produces rotational drive force.
Integrated without disassembling up to the drive shaft that transmits power to the excavation section
Then, pulling back to the starting shaft through the inside of the buried pipe row, and carrying out from the starting shaft to the ground (a), of the excavator, the dividing member that divides the excavation portion into a plurality of parts, the arrival Step (b) of carrying out from the vertical shaft or the starting vertical shaft to the ground, and after the step (b), of the machine, on the inner surface side of the outer shell tubular portion left in the ground,
And a step (c) of constructing a covering wall for embedding the outer shell tubular portion.

[Propulsion Method] As for the equipment and construction method of the basic propulsion method, the same technology as the normal propulsion method can be applied. Specifically, the buried pipe that is embedded in the ground to form a pipeline is connected to the rear of the excavator that excavates the ground, the ground is excavated while propelling the excavator, and the buried pipe is installed in the excavated hole. Fill up. The excavator is propelled from the starting shaft to the reaching shaft, which is excavated vertically downward from the surface of the ground.

The starting shaft needs to be large enough to carry in the machine and the buried pipe. It is also necessary to install an original push jack that applies propulsive force to the excavator and the buried pipe line. The plan shape of the starting shaft is generally a rectangular shape in which the axial direction of the original push jack is long. Usually, a new start shaft is excavated every time the propulsion work for one section is performed, and backfilling is often performed after the propulsion work is completed. Reaching shafts may not be able to drill as wide a hole as the starting shaft. For example, there are cases where structures such as buildings exist on the surface or underground. There are large areas where it is difficult to block traffic. The present invention is suitable when using such a narrow reaching shaft.

It is suitable when an existing manhole is used as the reaching shaft. Usually, the inner diameter of the surface opening portion of the human hole is about 600 to 900 mm. By using the existing human hole, the labor required for excavating and constructing the reaching shaft can be saved. There will be no need to cut off traffic on the ground, remove pavement, or re-pave work. The shield segment of the tunnel structure constructed by the shield method and the internal space of other existing structures constructed underground are also used as the reaching shaft. Even in such a case, the present invention is useful because there is no large space directly connected to the ground. As the propulsion method, there are a linear propulsion method for propelling the excavator and the buried pipe row along a straight path, and a curved propulsion method for propelling along a curved path. It can be applied to any construction method. It is suitable for propulsion work that includes a curved section at least in part.

The propulsion method includes not only the method of excavating the ground with an excavator, but also the method of consolidating the ground with the excavator and the method of supplying muddy water to the excavated surface of the ground to muddy the excavated soil. There is a muddy water propulsion method to be discharged with it. It can be applied to any construction method. [Buried pipe] Depending on the purpose of use and construction conditions, a pipe having the same material and shape as the buried pipe used in the ordinary propulsion method is used. Specific examples thereof include those made of a concrete material such as a fume pipe, a steel pipe, a composite pipe of a steel pipe and a concrete material, a synthetic resin pipe, a ceramic pipe and the like.

The end portion of the buried pipe may be provided with an uneven fitting structure for connecting the buried pipes, a watertight sealing structure, or the like. It is also possible to provide a mounting structure for various pipes and wirings inside the buried pipe. The diameter of the buried pipe is 8
The length is about 00 to 3000 mm and the length is about 0.2 to 6 m. INDUSTRIAL APPLICABILITY The present invention is useful for a small-diameter propulsion construction method using an embedded pipe having a relatively small diameter. [Excavator] The basic structure may be the same as that of the excavator used in the ordinary propulsion method.

As the structure of the excavator, an outer shell tubular portion in which a plurality of split tubular bodies are flexibly connected, an excavating portion disposed in front of the outer shell tubular portion and capable of being divided into a plurality of portions, and an outer shell tubular portion. And a drive mechanism portion that is housed inside and drives the excavation portion to rotate. <Outer shell tubular portion> The outer shell tubular portion is formed by connecting a plurality of divided tubular bodies so as to be bendable in the axial direction. In addition to a structure in which the front cylinder and the rear cylinder are divided into two, there is a structure in which the front cylinder, the central cylinder, and the rear cylinder are divided into three, and more than that. Each of the divided cylindrical bodies is constructed by assembling steel materials such as steel plates and shaped steel materials and joining and integrating them by joining means such as welding and bolt fastening. Usually, a curved steel plate is used to form a cylinder, and a rib structure for reinforcing the cylinder of the steel plate is added if necessary. The thickness of the steel plate forming the cylindrical shape varies depending on the outer diameter of the machine, but may be about 12 to 35 mm. The fume pipe is thinner than the buried pipe.

The connecting portion between the divided cylinders may be provided with a sealing structure for preventing the inflow of leachate and earth and sand from the ground. A sealing packing made of rubber or the like can be used for the sealing structure. A direction correction jack is used to flexibly connect the divided cylinders. The direction correction jack is equipped with a forward / backward mechanism such as a hydraulic cylinder or an electromagnetic cylinder. The cylinder body of the direction correcting jack is supported by one split cylinder body, and the other split cylinder body is supported by a piston shaft that is movable back and forth. The interval between the front and rear split cylinders is changed by the forward / backward movement of the direction correcting jack. To attach the direction correcting jack to the split cylindrical body, it is desirable to adopt a detachable attachment structure such as bolt fastening, fitting, and engaging mechanism.

By adjusting the advancing / retreating amounts of the direction correcting jacks arranged at a plurality of positions in the circumferential direction of the outer shell cylinder, the bending angles of the front and rear split cylinders can be freely changed. The propulsion direction of the excavator is changed by applying a propulsive force from the rear to the excavator in a bent state. The direction correcting jacks are arranged in at least two places in the circumferential direction of the outer shell cylinder portion, and in plural places, if necessary, in three or more places. Although it does not move back and forth like a direction correction jack, it is also possible to combine support fittings that flexibly connect the front and rear split cylinders. Normally, the support metal fittings may be arranged at one of the circumferentially equally divided portions and the direction correcting jacks may be arranged at the remaining portions. By adjusting the advancing / retreating amount of the remaining direction correction jacks with the position of the support fitting as the base point, the front and rear split cylinders are bent. The presence of the support fitting prevents the front and rear divided cylindrical bodies from being twisted and the distance from changing significantly.

At the rear end of the outer shell cylinder, that is, the rear end of the rearmost divided cylinder, a connecting structure for the buried pipe is provided. <Drilling section> The excavating section has an excavator that is rotatable in front of the machine. The excavator is made of steel or the like. A drill bit or a drill blade made of tool steel or the like is provided on the front surface or the outer periphery of the drilling machine. The excavator has a through hole or a through gap for discharging the excavated soil to the rear.
In the center of the excavator, a rotary shaft body to which the rotational force is transmitted from the drive mechanism unit can be provided. The rotating shaft body is detachably connected to the drive mechanism section.

It is desirable that the constituent members of the excavation section including the excavator are divided and configured into a size that allows them to pass through the inner shape of the reaching shaft. Each divided member is integrally assembled by a detachable fastening means such as bolt fastening, fitting, and engagement. For example, the excavator can be divided circumferentially and radially. The rotating shaft body can be divided in the axial direction. <Drive Mechanism Section> The drive mechanism section is housed inside the outer shell cylinder section and rotationally drives the excavation section. Basically, a structure common to the drive mechanism section of the excavator for a normal propulsion method can be adopted.

The drive mechanism section has a drive source such as a motor that produces a rotational drive force. Although the rotational force of the drive source can be transmitted to the excavation unit as it is, it is usually provided with a speed reducer that reduces the high-speed rotation of the drive source to a rotational speed suitable for driving the excavation unit and increases the torque. The speed reducer is composed of various speed reducing mechanisms such as a gear mechanism. A torque adjusting mechanism, a clutch mechanism, a thrust bearing structure that receives a reaction force of the ground applied from the excavation portion, and the like may be provided.
The drive mechanism section can be provided with a mounting board for attaching the drive mechanism section to the outer shell cylinder section. The mounting board is detachably attached to the outer shell cylinder by means such as bolt fastening, fitting, and engagement. A mounting ring for mounting the mounting board may be provided on the inner circumference of the outer shell tubular portion. The mounting board can also be used as a partition of a pressure chamber for accumulating muddy water in the muddy water propulsion method. The mounting board is usually the location with the largest outer diameter in the drive mechanism section. Therefore, by setting the outer diameter of the mounting board smaller than the inner diameter of the buried pipe,
The entire drive mechanism can be moved inside the buried pipe.

<Other Structures> In addition to the above, the excavator may be provided with various mechanical structures similar to those of a normal excavator. For example, there is a muddy water sending / discharging structure. The muddy water supply / discharge structure includes a muddy water supply piping path and a muddy water discharging piping path. The pipe path can be a combination of a rigid pipe and a flexible pipe hose. The piping path can be provided with various piping members such as a bypass piping, a flow rate adjusting valve, a check valve, a direction switching valve, a pressure regulating valve, a flow meter, and a pressure gauge. The mud water sending / discharging structure is preferably a structure that can be disassembled to such an extent that removal work becomes easy.

The excavator may be equipped with hydraulic piping, power supply wiring, communication control wiring, and other piping, wiring connections, and mounting structures required for drive control of the excavator and information collection. A sensor or a surveying device for detecting the position and orientation of the excavator can be provided. A target for laser surveying can be provided. Various equipment and structural members equipped to these excavators can be left in the ground together with the outer shell cylinder during the removal work, or they can be removed from the outer shell cylinder and reach the vertical shaft along with the excavation part. It can be carried out from the side or can be carried out by pulling it back to the starting shaft side together with the drive mechanism part.

[Removal work] After the propulsion work is completed, the excavation machine removal work is started. At the end stage of the propulsion work, buried pipes are laid in most of the starting shaft and the reaching shaft, and the excavator is arranged only at the place adjacent to the reaching shaft. The drive mechanism part of the excavator that is disconnected from the outer shell cylinder part is pulled back to the starting shaft through the inside of the buried pipe row and is carried out from the starting shaft to the ground. The drive mechanism section
Do not disassemble into individual equipment members, but transport them as a unit.
By attaching a wire or rope to the drive mechanism unit and pulling the wire or the like from the starting shaft side, the drive mechanism unit can be moved along the inner surface of the buried pipe. Normally, the maximum outer diameter part of the drive mechanism part is the mounting board to the outer shell cylinder part, and the other structural parts are sufficiently smaller than the inner diameters of the outer shell cylinder part and the buried pipe, so the inside of the buried pipe can be easily Can be passed through. It is also possible to provide a sled member or a sliding roller for improving sliding on the lower part of the drive mechanism section, or to dispose a rail or a roller conveyor on the inner surface of the buried pipe.

The piping structure and equipment attached to the drive mechanism section can be removed together with the drive mechanism section. It is also possible to remove the piping structure and equipment from the drive mechanism section and remove them before the drive mechanism section. For example, in the muddy water sending / discharging structure, the piping hose etc. excluding the piping structure part fixed to the mounting board of the drive mechanism part is disconnected and removed to the start shaft side first, and the remaining piping structure is the drive mechanism. It can be removed together with the department. In this way, when the drive mechanism is reused, it is only necessary to connect the piping hose, and the labor of reattaching the complicated piping structure can be saved. The excavation unit divides into a plurality of parts and carries out the divided dividing members from the reaching shaft or the starting shaft to the ground.
Since the outer diameter of the excavated portion corresponds to the outer diameter of the excavator and the buried pipe, the entire excavated portion cannot be pulled back to the starting shaft side through the interior of the buried pipe. With a dividing member that divides the excavator that constitutes the excavating portion in the circumferential direction or the radial direction, the excavator can be quickly and easily transported to the surface from the nearest reaching shaft side. Further, a part of the dividing member can be pulled back from the inside of the buried pipe to the starting shaft side. It is also possible to pull back a part of the constituent members of the excavation unit to the starting shaft together with the drive mechanism unit while keeping the drive mechanism unit integrally attached. The constituent member of the excavation unit that is handled integrally with the drive mechanism unit is a member that can easily pass through the inside of the outer shell cylinder unit and the buried pipe even when attached to the drive mechanism unit.

The disassembling and unloading work of the excavation part can be performed before the unloading work of the drive mechanism part, or the disassembly of the excavation part after the drive mechanism part disconnected from the excavation part is carried out first. It can also be carried out. The outer shell cylinder of the excavator is
Leave it in the ground. However, some of the devices and structural members attached to the outer shell tubular portion can be removed and removed from the outer shell tubular portion. It is preferable to remove reusable equipment and members that hinder the construction of the covering wall. It is only necessary to keep the equipment and components that make the removal work more time-consuming than the benefits of reuse.

For example, it is desirable to reuse the direction correction jack. The same applies to the fulcrum bracket. It is desirable to remove the laser survey target for reuse. The rib structure arranged on the inner surface of the outer shell tubular part
If left, it is effective for maintaining the structural strength and durability of the outer shell. However, if it is a part that interferes with the construction of the covering wall, it can be separated from the outer shell cylinder by means such as fusing and removed from the reaching shaft side. If the rib structure is detachably attached to the outer shell tubular portion by means such as bolt fastening or fitting, removal work is facilitated and reuse is possible.

If the sealing structure that seals the gap between the divided cylinders is left, the sealing function can be exerted even after the construction. The sealing structure such as the sealing packing can be removed and the gap between the divided cylindrical bodies can be closed by constructing the covering wall. [Construction of coating wall] When most of the excavator is removed and only the outer shell cylinder is left in the ground, the inner wall of the tunnel connecting the starting shaft and the reaching shaft is the part constructed by the buried pipe row. And the part formed by the outer shell of the excavator coexist.
Since the inner diameter of the buried pipe row and the inner diameter of the outer shell cylinder portion are considerably different from each other, a step is formed at the boundary portion between the two. The buried pipe and the outer shell have different characteristics such as mechanical strength and corrosion resistance.

Therefore, by constructing a coating wall inside the outer shell tubular portion, the outer shell tubular portion can be reinforced or protected. The covering wall is constructed on the inner surface side of the outer shell tubular portion remaining in the ground to embed the outer shell tubular portion. As the covering wall, one having the same material and characteristics as the buried pipe can be used. For example, concrete material, resin material, fiber reinforced resin material,
Examples include metal materials and ceramic materials. Composite materials such as resin and metal can also be used. Reinforced concrete can also be used.

In the case of hardening a fluid material such as concrete, a mold may be constructed inside the outer shell cylinder, and the fluid material may be poured into the inside to harden. At this time, the outer shell cylinder portion constitutes a part of the mold. A composite of an outer shell cylinder and concrete is constructed, and strength and durability can be improved as compared with a structure made of a single material. A prefabricated segment wall plate can be used as a method of constructing the covering wall. The segment wall plate is a curved plate member formed by dividing a cylindrical shape corresponding to the inner wall of the tunnel in the circumferential direction or the radial direction. As before,
Manufactured from concrete and fiber reinforced resin. The shape and size of the segment wall plate are set so that they can pass through the reaching shaft.

Such a segment wall plate can be carried into the reaching shaft from the ground, and the segment wall plate can be assembled on the inner surface side of the outer shell tubular portion to construct the covering wall. It is also possible to carry in the segment wallboard from the starting shaft side. The segment wall plate is fixed to the outer shell cylinder portion, the buried pipe, or the wall structure of the reaching shaft by means such as bolt fastening, anchor driving, fitting, and engagement. The segment wall plates are fixed to each other by the same means. When the segment wall plates have metal parts, they can be fixed to each other or fixed to the outer shell by welding. When the covering wall constructed by the segment wall plates has a gap between the segment wall plates, a gap between the segment wall plate and the buried pipe, the gap can be caulked. Specifically, mortar, concrete, resin adhesive or the like can be embedded. Finishing mortar can be applied to the inner surface of the constructed segment wallboard, or resin coating finish can be applied.

[Reuse of Excavator] The devices and structural members constituting the excavator removed from the construction site of the propulsion method can be reassembled and used again for propulsion work. For the reassembly of the excavator, the removed drive mechanism section and excavation section are used. It is necessary to newly manufacture the outer shell cylinder portion. Other than that, the members left in the ground and the discarded members are newly manufactured. Attach the mounting board of the drive device to the new outer shell via the mounting ring. Since the drive unit has not been disassembled, even if it is operated immediately after the mounting work, no serious problem occurs. It is possible to omit operations such as centering of the rotary shaft, fine adjustment of the assembly position, and operation confirmation, which are required when reassembling the drive device unit into individual parts. The trouble of refilling with lubricating oil or grease can be saved.

In the excavation part, the disassembled divided members are assembled and connected and integrated by bolting or the like. The excavator and excavating bit may have become dirty, damaged, or worn by dirt and muddy water from previous work. It can be assembled after cleaning and repairing each member and replacing parts. In addition, the type and arrangement of the excavating bit may be changed according to the soil condition of the next construction site. Install other equipment and structural members required for the excavator. For example, a direction correction jack and a surveying target are included. The structures required for piping and wiring can also be attached.

The excavator, which has been reassembled in this manner, is carried into the starting shaft again at the new construction site.
Used for propulsion work. The reassembled excavator may have the exact same size structure as the last time it was used, or it may be reassembled to a different size structure than the last time it was used. For example, if the outer diameter of the outer shell cylinder portion or the excavation outer diameter of the excavating portion is changed with respect to the same drive mechanism portion, the same drive mechanism portion can be applied to the propulsion method of the buried pipe having different caliber. If the capacity or capacity of the drive mechanism unit is within the range allowed, the same drive mechanism unit can be used for a plurality of stages of caliber.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION The embodiment shown in FIG. 1 uses a manhole as a reaching shaft of a propulsion method.
The starting shaft H has a rectangular shape in a plane and has a sufficient area.
Equipment necessary for the propulsion method such as the excavator 20 and the buried pipe 10 is loaded from the ground. Source push jack 9 to add propulsive force
Equipment such as 0 is installed. Note that, in FIG. 1, the depth width of the starting shaft H along the propulsion direction is illustrated to be narrower than the actual depth due to the space of the paper surface. In practice, when the operating shaft of the source push jack 90 is most retracted, the depth width is set to the extent that there is a space corresponding to the entire length of the excavator 20 in front of the operating shaft.

The human hole M to be the reaching shaft is much narrower than the starting shaft H. Usually, it has a plane circular shape. In particular, the opening on the surface of the earth has only an inner diameter that allows a person to pass through. [Structure of Excavator] As shown in detail in FIGS. 2 to 4, the excavator 20 includes a cylindrical outer shell cylinder portion 30, an excavation portion 50 arranged at the tip of the outer shell cylinder portion 30, and an outer shell. A drive mechanism section 40 that is housed inside the tubular section 30 and drives the excavation section 50 is provided. <Outer shell tubular portion> In the outer shell tubular portion 30, a front tubular body 32 and a rear tubular body 34, which are two front and rear divided tubular bodies, are connected to each other by a direction correction jack 60 and a fulcrum fitting 62 so as to be bendable. ing. Each of the front tubular body 32 and the rear tubular body 34 is configured by assembling and joining steel plates and shaped steel materials. A rib portion 37 made of an annular or band-shaped steel material is provided inside a cylinder made of a steel plate to improve the overall rigidity and deformation resistance.

As shown in FIG. 4, at the position where the circumferential direction of the excavator 20 is divided into three equal parts, direction correction jacks 60 are arranged at two left and right sides on the upper side, and a fulcrum metal fitting 62 is arranged at the center on the lower side. The direction correction jack 60 and the fulcrum metal fitting 62 are detachably attached to the outer shell tubular portion 30 by bolting or the like. The direction correcting jack 60 has an operation shaft at its tip end that can be moved forward and backward by hydraulic pressure, and widens or narrows the interval between the front cylindrical body 32 and the rear cylindrical body 34. Fulcrum bracket 6
2 connects the front tubular body 32 and the rear tubular body 34 in a bendable manner. As a result, the bending angle between the front tubular body 32 and the rear tubular body 34 is changed by adjusting the advancing / retreating amount of the left and right direction correction jacks 60. Front cylinder 32 and rear cylinder 34
The propulsion direction of the excavator 20 can be changed to the up-down direction and the left-right direction depending on the bending angle of.

A sealing portion 36 is provided at a location adjacent to the front tubular body 32 and the rear tubular body 34. The sealing portion 36 is formed of an annular packing, a water seal ring, or the like, and can reliably seal the gap even if the bending angle between the front tubular body 32 and the rear tubular body 34 changes. The buried pipe 10 made of a fume pipe or the like is fitted and connected to the rear end of the outer shell tubular portion 30. The outer diameter of the buried pipe 10 and the outer diameter of the outer shell tubular portion 30 are substantially the same. The inner diameter of the cylindrical surface of the outer shell tubular portion 30 made of a steel plate is naturally larger than the inner diameter of the thick embedded pipe 10, and the inner space of the outer shell tubular portion 30 is widened accordingly. There is.

<Drilling Section> The drilling section 50 has a drilling disk 52 that rotates in front of the outer shell cylinder section 30. On the front surface of the excavator 52, excavation bits 54 are attached at a plurality of positions at intervals in the radial direction and the circumferential direction. Drill bit 54
, A plurality of types having different structures and arrangements such as a main bit, a preceding bit, and a peripheral bit arranged in the radial direction on the front surface of the excavator 52 are arranged in combination. The excavation bit 54 excavates the ground E in a circular shape corresponding to the outer diameter of the excavator 52 to form a circular tunnel. A rotary shaft body 51 is provided at the center of the excavator 52. The rotary shaft 51 is rotationally driven by the drive mechanism unit 40 connected to the rear.

As shown in FIG. 3, the excavator 52 is divided into a radial direction and a circumferential direction. The outer peripheral side has four fan-shaped dividing plates 52a, and the inner peripheral side has two semicircular fan-shaped dividing plates 52b. Each split board 52a, 52
b is detachably connected and fixed by bolt fastening.
The partition plate 52b on the inner peripheral side is detachably connected and fixed to the rotary shaft body 51 . <Drive Mechanism Section> The drive mechanism section 40 includes a motor 41 that generates a rotational drive force,
It has a reduction gear 44 for reducing the rotation of the motor 41, and a mounting board 46 for attaching the drive mechanism portion 40 to the outer shell tubular portion 30.
The mounting plate 46 of the drive mechanism section 40 is brought into contact with the mounting ring 33 arranged on the inner circumference of the outer shell tubular section 30 and is bolted and fixed. The drive shaft 4 is located in the center of the front surface of the mounting board 46.
7 is protruding. The tip of the drive shaft 47 has a taper shape, and is fitted into a taper hole provided in the rotary shaft body 51 of the excavation section 50 and is fixedly connected with a key or the like. Rotational force is transmitted from the drive shaft 47 to the rotary shaft body 51. The connection between the drive shaft 47 and the rotary shaft 51 can be released by releasing the connection and fixation with a key or the like.

<Other Structures> A muddy water feed / discharge section 70 is connected to the mounting board 46 of the drive mechanism section 40 so that the muddy water propulsion method can be carried out. As shown in FIG. 4, the muddy water sending / discharging unit 70 is composed of two pipe paths, a mud sending pipe and a mud sending pipe. Bypass pipes that connect two pipe paths, mechanisms that regulate flow rate and pressure, switching valves, etc.
It has the same structure as an excavator for a normal muddy water propulsion method. From the muddy water supply / discharge unit 70, muddy water is supplied to the space in front of the mounting board 46, and muddy water is supplied from the front surface of the excavator 52 to the ground. The excavator 52 is provided with a through hole through which mud or mud containing discharged soil passes. By supplying muddy water to the excavated surface, it is possible to facilitate the excavation and prevent the collapse of the ground by mud pressure. The excavated soil is discharged together with mud from the mud pipe of the mud sending / discharging unit 70. As shown in FIGS. 1 and 2, a mud water hose 72 for mud sending and mud discharging is connected to the mud water sending and discharging section 70.
It is laid from the starting shaft H to the ground through 10 rows of buried pipes.

Further, the excavator 20 is provided with
Target board for laser surveying and direction correction jack 60
It is equipped with the same mechanism and structure as an excavator for a normal propulsion method, such as hydraulic piping for supplying oil pressure to, a power line for control, and a communication line. [Propulsion Work] As shown in FIG. 1, the excavator 20 and the buried pipe 10 connected to the rear of the excavator 20 are propelled horizontally from the inner wall of the starting shaft H to the ground E. The operating shaft of the source push jack 90 installed in the starting shaft H is applied to the rear end of the 10 rows of the buried pipes, and the operating shaft of the source push jack 90 is extended to apply thrust. The 10 rows of buried pipes and the excavator 20 are propelled into the ground E.

In the excavator 20, the front excavator 52 is rotationally driven to excavate the ground E. The excavated soil is mixed with the muddy water supplied from the muddy water sending / discharging unit 70, and is discharged from the muddy water sending / discharging unit 70 through the muddy water hose 72. When one buried pipe 10 is propelled, the original push jack 90 is retracted and a new buried pipe 10 is added to the rear end of the 10 buried pipe rows. Such steps are repeated. As shown in FIG. 1, when the tip of the excavator 20 reaches the existing manhole M, which is a reaching shaft, the propulsion work ends. [Removal Work] Removal work of the machine 20 is performed as shown in FIG. Prior to that, the work of removing the original push jack 90 from the starting shaft H and the work of removing the mud hose 72 and other pipes and wirings installed in the buried pipe 10 are performed in advance.

The excavator 20 is disassembled, and part of the machine is buried pipe 10.
It pulls back to the starting shaft H side through the inside of. Some are human holes M
Take it out. The remaining part is left in the ground E. Excavation part 5
Each member forming 0 is taken out to the human hole M. The excavator 52 is disassembled into individual dividers 52a and 52b. The rotary shaft body 51 is removed from the drive shaft 47 of the drive mechanism section 40. The disassembled excavation section 50 easily passes through the narrow manhole M and is carried out to the ground. Note that the rotary shaft body 51 and the center side portion of the excavator 52 can be left attached to the drive mechanism section 40 and moved together with the drive mechanism section 40. Further, among the disassembled members of the excavation part 50, the disassembled members that are difficult to pass through the human hole M are the starter shaft H.
It is also possible to carry it out from the side.

The drive mechanism section 40 releases the connection with the outer shell tube section 30. The muddy water sending / discharging unit 70 remains attached to the drive mechanism unit 40. A pulling wire is attached to the drive mechanism unit 40, and the pulling shaft is pulled from the starting shaft H side. Buried pipe 1
The entire drive mechanism 40 is pulled back to the starting shaft H through the 0-row internal space. The drive mechanism unit 40 pulled back to the starting shaft H is carried to the ground by using a lifting device such as a crane or a hoist. The starting shaft H is the excavator 20
Is so wide that it can be carried in, the drive mechanism 40 can pass through the starting shaft H with a margin. The outer shell tube portion 30 is
Leave it in the ground E. However, among the devices and structural members attached to the outer shell tubular portion 30, those structures that should be reused are removed from the outer shell tubular portion 30 and taken out to the human hole M side or the starting shaft H side to be grounded. You can take it to.

For example, the direction correcting jack 60 and the fulcrum fitting 62 can be detached from the outer shell cylinder portion 30 and carried out from the manhole M side. The drive mechanism section 40 is attached to the outer shell tube section 30.
It is possible to remove the mounting board 46 attached to the outer shell tube portion 30 from the outer shell cylinder portion 30 and further disassemble the mounting board 46 to the human hole M side. Drive mechanism 4 such as laser survey target
The equipment attached to 0 can be pulled back to the side of the starting shaft H together with the drive mechanism 40. [Construction Work of Covering Wall] As shown in FIG. 2, in most of the tunnel formed by the propulsion method, the hole wall is covered with the buried pipe 10 such as a fume pipe, but the tunnel adjacent to the human hole M is The part is in a state where the hole wall is constructed by the outer shell cylinder part 30 made of the steel material of the excavator 20.

Since the outer shell tube portion 30 has sufficient rigidity strength, the tunnel structure can be maintained even in this state. However, the steel outer shell tubular portion 30 alone lacks strength and durability, lacks water tightness and pressure resistance at the joint between the front tubular body 32 and the rear tubular body 34, and has irregularities on the inner surface side. If there is an obstacle to the flow of sewage or there is a need to eliminate the step difference from the buried pipe 10, the outer shell tube portion 30 can be buried to construct a covering wall. As shown in FIG. 6, the concrete covering wall 14 is constructed on the inner surface side of the outer shell tubular portion 30. The protruding structure and the sealing portion 36, such as the rib portion 37 protruding on the inner surface of the outer shell cylinder portion 30, which hinders the construction of the covering wall 14, are removed or cut off before the work of constructing the covering wall 14. I will keep it.

The covering wall 14 is made of a concrete material similar to that of the buried pipe 10, and a segment wall plate 15 having an arc surface obtained by dividing a cylindrical shape in the circumferential direction and the axial direction is carried into the manhole M from the ground. Then, the outer shell tube portion 30 is attached so as to be attached along the inner surface thereof. The segment wall plate 15 is
It can be fixed to the outer shell tubular portion 30 by bolting or the like. The segment wall plates 15 may be fixed to each other by bolt fastening or the like. The space between the segment wall plates 15 or the wall structure of the human hole M can be filled with mortar or concrete. Finished mortar can also be applied to the inner surface of the constructed segment wall plate 15.

By constructing the covering wall 14 in this way,
Even at a place where the outer shell tube portion 30 is left, a tunnel structure similar to the installation portion of the other buried pipe 10 can be constructed, and the step is eliminated. The outer shell tubular portion 30 can be used as a mounting support structure for the segment wall plate 15, and can also fulfill a reinforcing function. As another embodiment, it is also possible to construct the covering wall 14 by assembling a formwork for concrete placement inside the outer shell tube portion 30 and then placing and curing concrete. In this case, the outer shell tubular portion 30 constitutes a mold on the outer peripheral side.

[0055]

According to the method of removing the excavator in the propulsion method according to the present invention, among the structural parts constituting the excavator, the drive mechanism section is pulled back to the start shaft through the inside of the buried pipe row and carried out from the start shaft to the ground. Then, the excavation part is divided into multiple parts and carried out to the ground, and the outer shell cylinder part is left in the ground,
Even when the reaching shaft is narrow, it is possible to efficiently perform the work of removing the machine. Moreover, since the drive mechanism is not disassembled into small pieces and is carried out from the starting shaft as it is without being disassembled, it can be quickly used for the next propulsion work without any troublesome work such as reassembly, operation adjustment, and test operation. it can. Even if you use the same drive mechanism, you can easily change the bore diameter of the excavator by combining it with an outer shell cylinder that has a different bore diameter from the last time you used it, and you can easily adapt to buried pipes with different bore diameters. it can. It is possible to save the labor of preparing a drive mechanism section for each diameter of the buried pipe, and reduce the equipment cost and the construction cost of the propulsion method.

By leaving the outer shell tubular portion in the ground, the labor for disassembling and removing the outer shell tubular portion can be saved, and the outer shell tubular portion can be used as the inner wall structure of the tunnel.

[Brief description of drawings]

FIG. 1 is a sectional view showing a propulsion process of a propulsion method according to an embodiment of the present invention.

[Fig. 2] Cross-sectional view of the excavator

FIG. 3 is a side view seen from the front side of the excavator.

FIG. 4 is a cross-sectional view seen from the rear side of the excavator.

FIG. 5 is a cross-sectional view showing the removal process.

FIG. 6 is a sectional view of an essential part showing a process of constructing a covering wall.

[Explanation of symbols]

10 buried pipe 20 machine 30 Outer shell tube 32 front cylinder 34 Rear cylinder 40 Drive mechanism 42 motor 44 reducer 46 Mounting board 50 Excavator 51 rotating shaft 52 excavator 54 drilling bits 60 direction correction jack 62 Support bracket 70 Muddy water sending and discharging section

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP 2003-214085 (JP, A) JP 2002-322896 (JP, A) JP 2001-98886 (JP, A) JP 2000-303779 (JP, A) JP 2000-87685 (JP, A) JP 11-210375 (JP, A) JP-B 7-68871 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/06

Claims (2)

(57) [Claims] 1. A propulsion method for propelling an excavator having a buried pipe connected to the rear thereof while excavating the ground from a starting shaft to a reaching shaft, wherein the excavator is removed from the ground. Is an outer shell cylinder part having a plurality of split cylinders that are flexibly connected and having an outer diameter substantially the same as the outer diameter of the buried pipe, and is arranged on the front surface of the outer shell cylinder part and can be divided into a plurality of parts. The excavator, and a drive mechanism part that is housed inside the outer shell tubular portion to drive the excavation portion to rotate. The drive mechanism of the excavator that has been disconnected from the outer shell tubular portion. Drive that produces at least rotational drive force
From the source to the drive shaft that transmits the rotational drive force to the excavation section.
A process in which they are integrated without being disassembled , pulled back to the starting shaft through the inside of the buried pipe row, and carried out from the starting shaft to the ground.
(a), of the excavator, a dividing member obtained by dividing the excavation portion into a plurality of parts, a step (b) of carrying out from the reaching shaft or the starting shaft to the ground, and after the step (b) Of the excavator, a method of removing the excavator in a propulsion method including a step (c) of constructing a coating wall on the inner surface side of the outer shell tubular portion left in the ground to embed the outer shell tubular portion. . 2. The step (c) of constructing the covering wall carries a segment wall plate obtained by dividing a cylindrical shape into the outer shell tubular portion from the ground through the reaching shaft or the starting shaft. Step (c-1), and the step of building the coating wall by assembling the segment wall plate on the inner surface side of the outer shell tubular portion (c-2)
The method for removing an excavator in the propulsion method according to claim 1, including: