JP2791398B2 - Curved propulsion method and equipment and buried pipe for curved propulsion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curve propulsion method and apparatus, and more particularly, to a method for forming a buried hole directly in the ground without digging the ground when burying an underground pipe such as a sewer pipe. The present invention relates to a so-called propulsion method in which a buried pipe is buried in a formed burial hole, particularly to a method for constructing a curved portion, that is, a curve propulsion method and an apparatus used for implementing the curve propulsion method.

[0002]

2. Description of the Related Art The propulsion method has been researched and developed as a method suitable for a construction site or the like where the traffic volume is large and the traffic is difficult to restrict because it is not necessary to cut the ground widely along the buried route. And, in burial construction such as sewer pipes,
Construction of shafts can be difficult due to various road restrictions. In addition, there is a case where it is necessary to bury a buried pipe in a curved shape along a road shape due to a precondition that the buried pipe is buried under a public road. In such a case, it is necessary to apply the propulsion method to the curved portion.

Conventionally, to apply a propulsion method to a curved part,
First, a plurality of directional control jacks are provided in the circumferential direction of a leading conductor having an earth auger and a consolidation head, and by extending and contracting the directional controlling jack, the leading conductor is deflected to a predetermined curved direction. Let it go. In this state, if a propulsion force is applied to the end of the row of buried pipes by a main push jack or the like, the leading conductor is propelled in the curved direction, and a curved buried hole is formed. Are sent along the buried hole.

A jack similar to the directional control jack is also provided at a connection portion between buried pipes connected to the rear of the leading conductor, and the jacks push the front and rear buried pipes to form a predetermined curve. A method of propulsion in a state of being bent at an angle along the same has also been proposed. The jack is also called an auxiliary jack or a middle jack. A so-called telescopic cylinder that supplies a pressurized fluid and expands and contracts a piston by fluid pressure, such as a hydraulic cylinder or a pneumatic cylinder, is often used as an operating mechanism of such a jack.
The telescopic cylinder has an advantage that the operation is quick and smooth, the precise control of the telescopic amount is possible, and the telescopic cylinder is suitable for remote control and automation.

[0005]

However, the conventional curve propulsion method as described above has a problem that it is difficult to apply it to the propulsion construction of a curved portion having a small radius of curvature, that is, a sharp curve. This is considered to be due to the following reasons. When the above-described telescopic cylinder is employed as a jack for forming a curve mounted between the leading conductor and the subsequent buried pipe or between the buried pipes, the pipe is bent when the leading conductor and the buried pipe are bent along the curve. Among the plurality of telescopic cylinders arranged in the circumferential direction of the cross section, the telescopic cylinder outside the curve is greatly extended, and the telescopic cylinder inside the curve is contracted. In this state, when propelling the leading conductor and the buried pipe along the curve, the reaction force applied to the telescopic cylinder from the ground etc. is divided into a component applied in the axial direction of the piston and a component applied in the direction orthogonal to the axis. Divided. The telescopic cylinder can relatively endure the axial force of the piston, but has the disadvantage that it is weak to the force in the direction perpendicular to the axis of the piston, especially to shocking force. By the force in the direction orthogonal to
The piston may be deformed, or a failure may occur on the sliding surface between the piston and the cylinder. Due to the soil condition of the ground, it is often possible to increase the reaction force in a shocking manner. The smaller the radius of curvature of the curve, that is, the sharper the curve, the more the force component in the direction perpendicular to the axis of the piston increases, so that the above-described problem is more likely to occur.

Further, when the magnitude of the reaction force applied to the telescopic cylinder changes due to a change in the geology of the ground or the like, the piston elastically expands and contracts, and the bending angle between the leading conductor and the succeeding pipe or between the following pipes increases. There is a problem that changes. Since the piston of the telescopic cylinder is maintained at a predetermined position with the fluid pressure and the reaction force balanced, if the magnitude of the reaction force fluctuates, the elastic position of the piston changes due to the elastic deformation of the fluid. It will be. If the expansion / contraction position of the piston changes, the interval between the front and rear tubes at that position also changes, and the bending angle of the tube changes. Therefore, the leading conductor and the following tubular body are propelled in a form deviating from a desired curved shape. Such a shift in the curve due to the change in the reaction force also becomes more noticeable as the curve is sharper.

Furthermore, in the telescopic cylinder, the fluid pressure may fluctuate depending on the characteristics of the fluid pressure supply source and the piping in the middle. There is also a problem that the position of the piston fluctuates due to the cause on the telescopic cylinder side. Even if the reaction force fluctuates, the position of the piston is precisely monitored so that the position of the piston does not change, and the fluid pressure and the amount of fluid to be supplied are precisely adjusted and controlled in accordance with it, as described above. Can be solved to some extent, but for that, a complicated control device is required and the operation becomes difficult.

In addition to the above-described telescopic cylinder driven by fluid pressure, a piston or other jack mechanism driven by electromagnetic force or the like is also used, but it has the same problem, albeit to a different degree. Therefore, an object of the present invention is to solve the problems of the prior art in the curve propulsion method as described above, to increase the durability of a mechanism for bending a leading conductor or a subsequent tube in a curved shape, and to reduce the reaction force. It is an object of the present invention to provide a method which can prevent a deviation of a curved shape and can be favorably applied to propulsion construction of a curved portion having a large curvature. Another object of the present invention is to provide a curve propulsion device used in such a method. Another object of the present invention is to provide a buried pipe for curved propulsion that can be smoothly buried even in a curved portion having a large curvature.

[0009]

According to the curved propulsion method of the present invention, which solves the above-mentioned problems, a curved buried hole is formed by a leading conductor, and a buried pipe is buried along the curved buried hole. In the curve propulsion method, a plurality of pipes consisting of a leading conductor and a succeeding tubular body connected to the back of the leading conductor are flexibly bent at a plurality of locations in the circumferential direction on opposite surfaces of each other via a telescopic pushing jack. In addition to being connected, mechanical fixing means for mechanically fixing the interval between the front and rear pipes is provided adjacent to the telescopic push jack in any telescopic state of the telescopic push jack. According to the desired curvature of, the front and rear pipes are bent at a predetermined angle by the telescopic pushing jack, and then the bent state is fixed by mechanical fixing means, and then a propulsive force is applied to the plurality of pipes including the leading conductor. Propelled in a curved shape.

The basic structure of the leading conductor is the same as that used in the ordinary propulsion method. The outer diameter of the leading conductor is set according to the outer diameter of the buried pipe to be laid. The leading conductor is provided with a digging means such as an earth auger, a head for compacting the ground, and the like, and a buried hole is formed as the leading conductor is propelled. Further, there is also provided a mechanism that circulates and supplies muddy water from the leading conductor to the ground surface and discharges excavated earth and sand together with the muddy water.

[0011] The succeeding pipe is a pipe which is finally buried and buried, and a pipe which is prepared separately from the buried pipe.
A temporary pipe replaced with a buried pipe after being propelled with the tip conductor and laid in the burial hole, and a pipe body connected behind the tip conductor to form a burial hole, There is a case where an auxiliary pipe is integrated with a leading conductor for connecting and propelling a buried pipe or a temporary pipe. When this auxiliary tube is used, a leading conductor device is constituted by a leading conductor and a plurality of subsidiary tubes. The material and structure of the buried pipe and the temporary pipe may be the same as those of the conventional ordinary propulsion method. As the buried pipe, a fume pipe, an FRP pipe, a steel pipe, a synthetic resin pipe, or the like is used. As the temporary pipe, a steel pipe or the like that can be used repeatedly is used. For the auxiliary pipe, a steel pipe or the like similar to the outer shell structure of the leading conductor is used.

[0012] The telescopic push jack has a jack mechanism employed in a normal propulsion method and other civil engineering equipment, as long as the distance between both ends thereof can be expanded and contracted so that an object abutting on both ends can be pushed. Can be applied. There are telescopic push jacks that use the motor by converting the rotational force of the motor into linear motion, those that directly apply electromagnetic force in the linear direction, and those that use fluid pressure. A telescopic cylinder driven by fluid pressure is preferred. As the telescopic cylinder, a cylinder device driven by fluid pressure such as hydraulic pressure, pneumatic pressure, water pressure, and the like is used, which is the same as that used in conventional deflection jacks, auxiliary jacks, and middle push jacks of the leading conductor. . As a specific structure of the cylinder device, a cylinder device having a cylinder body and a piston that can freely enter and exit the cylinder body can be adopted.

The telescopic push jack comprises a leading conductor and a trailing tube,
Alternatively, it is provided at a plurality of locations in the circumferential direction on the opposing surfaces of the subsequent tubes. Specifically, at least 2 in the diametric direction
It may be provided in three places, three places, four places or six places.
The required number may be provided in accordance with the conditions such as the required pushing force or the bending direction of the curve, such as the location. The telescopic pushing jack has one or both of the front and rear mounting portions rotatably mounted. As a result, by making a difference in the amount of expansion and contraction of the expansion / contraction push jacks provided at a plurality of positions in the circumferential direction, the front and rear leading conductors or the following tubular bodies can be bent mutually. Therefore, a plurality of telescopic pushing jacks arranged in the circumferential direction uniformly control the operation such as supply and discharge of fluid,
It is preferable that a bending operation along a desired curved shape can be efficiently performed.

The telescopic push jack can be installed at any position in the tube row composed of the leading conductor and the succeeding tube to be propelled. In general, if a telescopic pushing jack is attached between the leading conductor and several succeeding tubes, a desired curved buried hole can be formed. Even if there is no telescopic pushing jack between them, it can be propelled along the curved buried hole.

When the telescopic push jack is provided on the auxiliary pipe constituting the leading conductor device together with the leading conductor, the telescopic push jack may be fixedly attached to the pipe. In the case where the jack is provided in a buried pipe or a temporary pipe, it is preferable that the telescopic pushing jack can be removed after the burying work. The mechanical fixing means is provided on the front and rear pipes adjacent to the telescopic pushing jack. As a structure of the mechanical fixing means, in a state where the telescopic push jack is adjusted to an arbitrary telescopic length, if the interval between the front and rear pipes set by the telescopic push jack can be mechanically fixed, Fixing means such as those used in various mechanical devices can be used. Specifically, a fixing means using a bolt and a nut, a fitting fixing means using a key or a fitting uneven portion, or the like can be applied. When the telescopic pushing jack changes its telescopic length continuously, it is preferable that the fixing position of the mechanical fixing means can also be continuously changed. If only the curvature of the propulsion curve needs to be changed stepwise, the telescopic position of the telescopic pushing jack and the fixing position of the mechanical fixing means may be set stepwise.

The mechanical fixing means can reliably bear an external force in a direction perpendicular to the axis so that a force in a direction perpendicular to the axis is hardly applied to an operation mechanism of the telescopic pushing jack, for example, a piston of the telescopic cylinder. It is preferable to have such a structure. Specifically, a rigid structure such as a shaft or a tube parallel to the telescopic pushing jack may be provided. More specifically, the telescopic pushing jack includes a cylinder body attached to one of the front and rear leading conductors and the auxiliary pipe, and a piston attached to the other, which moves in and out of the cylinder body. A fixed shaft provided on the cylinder body and extending to the piston side, a guide plate provided on the piston side and guided by the fixed shaft, and a fastening for fastening the fixed shaft and the guide plate at different positions in the axial direction of the fixed shaft. And a member. A bolt shaft may be used as the fixed shaft, a flange plate having a bolt hole through which the bolt shaft is inserted may be used as the guide plate, and a nut screwed into the bolt shaft may be used as the fastening member. An engaging hole or an engaging groove is provided at a plurality of positions of the fixed shaft, a fastening member is attached to the guide plate, and an engaging portion provided on the fastening member is engaged with an arbitrary engaging hole or an engaging groove of the fixed shaft. It may be one that can be combined. The guide plate may guide the fixed shaft by a guide groove or a guide ridge.

As a curve propulsion method using the above-described apparatus, a buried hole is formed in the ground with a leading conductor in a state in which a trailing pipe such as a buried pipe is connected behind the leading conductor, and the leading conductor and the trailing pipe are formed. A method similar to a conventional ordinary propulsion method is used in that a propulsion force is applied to the body to propel the body along the formed buried hole. The propulsion is usually applied to the end of the pipe row by a main push jack installed in the starting shaft etc., but the propulsion shaft is arranged in the center of the pipe row and the tip of the propulsion shaft is connected to the leading conductor In addition, the propulsion force applied by the main push jack to the rear end of the propulsion shaft can be transmitted from the front conductor in the direction in which the rear pipe is pulled.

Further, a semi-shield jack is provided between a leading conductor device comprising a leading conductor and a single or a plurality of auxiliary pipes and a subsequent buried pipe or a temporary pipe, and the semi-shield jack is extended. After the front conductor device is propelled forward to form a buried hole, the semi-shield jack is shrunk, and the propulsion force is applied to the succeeding tube row with a main push jack, etc. In order to catch up, a method of propelling along the buried hole can be adopted.

When the leading conductor or the leading conductor device is to be propelled, the amount of expansion and contraction of the telescopic pushing jack provided between the tubes including the leading conductor is adjusted in advance, and the bending angles of the front and rear pipes are adjusted. To the required curve shape of the buried hole at that point. When the pipes have a predetermined bending angle, the distance between the front and rear pipes is fixed by mechanical fixing means so that the telescopic pushing jack does not expand or contract any further. As a result, the leading conductor and the trailing tube are integrated into one curved tube as a whole. When the curved portion of the tubular body including the leading conductor is propelled by the above-described method, a buried hole having a curved shape along the curved shape of the tubular body is formed.

In the case where the propulsion construction path includes both a curved portion and a straight line portion or a curved portion having a different curvature, the amount of expansion and contraction of the telescopic pushing jack, ie, the amount of expansion and contraction, is adjusted in accordance with each location. What is necessary is just to change the bending angle between the tubes, or to repeat the fixing operation and the fixing releasing operation by the mechanical fixing means. As the buried pipe used in the curve propulsion method, it is composed of a plurality of divided pipes connected in the axial direction, and each divided pipe has a cylindrical concave portion at one end in the axial direction and another at the other end in the axial direction. The split tubular body has an insertion protrusion inserted into the cylindrical recess at an interval in the radial direction, and a cylindrical recess and an insertion protrusion are provided at radially opposed portions of the cylindrical recess and the insertion protrusion. A sealing means for sealing the inside and outside of the tube so as to be relatively movable, the tip connecting surface disposed at the tip of the insertion projection and the tip connection surface of the insertion projection inside the cylindrical recess. At a plurality of locations in the circumferential direction where the internal connection surfaces arranged opposite to each other are connected in such a manner that the distal end connection surface and the internal connection surface are movably connected in the axial direction within an allowable range, and the allowable range can be changed. The one provided with the means is used.

The material of the divided pipe is steel, synthetic resin, FR
The same materials as ordinary buried pipes such as P and concrete are used. It is also possible to use a composite pipe made of a plurality of materials, such as one in which concrete is cast on the inner surface of a steel pipe. The specified length of a normal buried pipe is determined in consideration of workability such as transportation, loading into a shaft, propulsion by a main jack, and the like. The split pipe may be such that a buried pipe of such a specified length is composed of a plurality of split pipes.

It is preferable that the cylindrical concave portion and the insertion convex portion have an interval at a radially opposite point where the divided pipe bodies can be bent in accordance with the curvature of the buried hole to be propelled. This radial interval is the bending angle required for the divided pipes described above, the axial overlapping length of the cylindrical concave portion and the insertion convex portion,
It is determined by conditions such as the diameter of the divided pipe. In a state where the divided pipes are connected, it is preferable that large irregularities are not generated on the outer surface of the divided pipe. Therefore, it is preferable that the outer shape of the cylindrical concave portion is set to be the same as the outer diameter of the entire divided pipe body. In addition, if the insertion convex portion is provided on the front side and the cylindrical concave portion is provided on the rear side with respect to the propulsion direction of the divided pipe body, resistance from the ground is small and smooth propulsion construction can be performed.

As the sealing means, a sealing structure which has been conventionally applied to movable parts of various mechanical devices can be adopted.
For example, a seal member made of rubber or a soft synthetic resin may be attached to one of the opposing surfaces of the cylindrical concave portion and the insertion convex portion so that the end surface of the seal material contacts the other opposing surface. If irregularities, fins, and the like are provided on the end face of the sealing material that hits the other facing surface, the sealing function is enhanced. O-rings and grooves or projections for holding the O-rings may be provided as sealing means.

The distal end connecting surface of the insertion convex portion and the inner connecting surface of the cylindrical concave portion need only be provided with a material and a structure capable of withstanding a load applied during propulsion construction in a state where the divided pipes are connected. It is preferable to make it from a rigid material such as a steel plate. It is preferable that the distal end connecting surface and the inner connecting surface are provided only on the outer peripheral portion which does not hinder various operations inside the buried pipe or passage of pipes and cables. The tip connection surface and the internal connection surface may be provided over the entire circumference in the circumferential direction, or may be provided only at a plurality of locations where the connection means is provided.

The connecting means has a mechanical strength enough to allow the divided pipes to be buried and buried, and if the divided pipes can be bent, a flexible connecting structure in various mechanical devices can be applied. It is preferable that the connecting means be provided in at least two opposing directions in the circumferential direction, that is, a part which becomes inside and a part which becomes outside when the divided pipe body is bent. If connecting means are provided in all four directions orthogonal to the circumferential direction, it is possible to cope with the case where the divided pipe is bent in an arbitrary direction.

It is preferable that the connecting means provided at a plurality of positions in the circumferential direction can separately set the permissible range in the axial direction between the distal end connecting surface and the inner connecting surface. When the divided pipes are bent, the permissible range is set wide where the distal connecting surface and the internal connecting surface are largely separated in the axial direction. The allowable range is set to be small at a place where the front connection surface and the internal connection surface are close to each other.

[0027] As a connecting means, a connecting shaft body having a through hole penetrating the tip connecting surface and the inner connecting surface, a shaft portion inserted through the through hole, and a head engaged with the tip connecting surface or the inner connecting surface. And a regulating member fixed to the shaft portion of the coupling shaft body with the distal coupling surface and the internal coupling surface interposed between the head of the coupling shaft body and regulating a movement range between the distal coupling surface and the internal coupling surface. Can be kept.

It is preferable that the through-hole is spaced from the connecting shaft so that the connecting shaft can be allowed to tilt or shift when the divided pipes are bent. The connecting shaft body needs to have mechanical strength enough to withstand the load applied during propulsion construction. The length of the connection shaft body is set in accordance with the allowable movement range of the tip connection surface and the internal connection surface. It is sufficient that the head of the connecting shaft protrudes outside the through-hole and is engaged with the connecting surface or the internal connecting surface.

An ordinary bolt having a screw shaft and a head can be used as the connecting shaft. A nut screwed into a bolt can be used as the regulating member. If a double nut is used as the nut, the mounting position of the regulating member can be reliably determined. An engaging hole or an engaging groove for engaging the regulating member at a plurality of positions along the shaft portion of the connecting shaft body is provided, and the engaging action between the engaging hole and the engaging groove and the regulating member provides
The restricting member can be fixed to the connecting shaft. The restricting member can be fixed to the connecting shaft using a pin or a cotter.

It is convenient to handle and transport the above-mentioned curved propulsion buried pipe in a state where a plurality of divided pipes are connected and transported and stored. However, it is also possible to disassemble and handle each divided pipe. When connecting the buried pipes at the time of the propulsion construction, the buried pipes can be easily bent by connecting the divided pipes of the front and rear buried pipes so as to be bendable by the connecting means. The curve propulsion buried pipe can be applied to the curve propulsion method using the above-described telescopic pushing jack and mechanical fixing means. That is, an auxiliary pipe is connected to the rear of the leading conductor via the telescopic pushing jack and mechanical fixing means, and the buried pipe for curved propulsion is connected to the rear of the auxiliary pipe so that the desired curvature of the propulsion point is obtained. According to the above, the front and rear pipes are bent at a predetermined angle by a telescopic pushing jack, then the bent state is fixed by mechanical fixing means, and further, each of the divided pipes of the curved propulsion buried pipe corresponds to the desired curvature. After setting the allowable range of the connecting means of each of the divided pipes so as to bend at a bending angle, the propulsion force is applied to the leading conductor and the auxiliary pipe and the buried pipe for curved propulsion, and the buried pipe for curved propulsion Is buried in the burial hole.

It is preferable that the length and the bending angle of the leading conductor and the auxiliary pipe are equal to the length and the bending angle of each of the divided pipes of the buried pipe for curved propulsion. Curved propulsion buried pipes, after propulsion construction, fix the bending angle of each divided pipe, seal the joint of each divided pipe, or reinforce the inner surface of each divided pipe be able to.

[0032]

[Function] A method of performing a propulsion construction along a desired curved shape by changing a bending angle between a leading conductor and a succeeding pipe or between succeeding pipes by using a plurality of telescopic pushing jacks arranged in a circumferential direction. Is already known. In the present invention, after adjusting the bending angles of the front and rear pipes with the telescopic pushing jack, the distance between the front and rear pipes is fixed by the mechanical fixing means in the expanded and contracted state. If the spacing between the tubes is fixed,
The bending angles of the front and rear pipes are also fixed.

As described above, if the tube body including the leading conductor is propelled in a state where the bending angle is fixed by the mechanical fixing means,
Even if the reaction force from the ground fluctuates, the operating shaft of the telescopic pushing jack does not move and the curved shapes of the leading conductor and the trailing pipe do not shift. Even when the driving force of the telescopic pushing jack, for example, the supply fluid pressure of the telescopic cylinder, fluctuates, the interval between the tubes fixed by the mechanical fixing means does not change.

Since the reaction force from the ground is applied to the mechanical fixing means and is borne by the mechanical fixing means, a large external force does not act on the telescopic pushing jack in a direction perpendicular to the axis. As a curve propulsion device used in the curve propulsion method, if the telescopic pushing jack includes the cylinder body and the piston, and the mechanical fixing means includes the fixed shaft, the guide member, and the fastening member, Although the structure is relatively simple, the functions of the telescopic push jack and the mechanical fixing means can be reliably achieved.

If the buried pipe used in the curve propulsion method is a combination of the above-mentioned divided pipes, the divided pipes bend each other. The propulsion can be buried smoothly. The connecting points between the divided pipes are sealed by sealing means.
The inflow of sediment and groundwater into the pipe can be prevented well. The connecting means for connecting the divided pipes at a plurality of locations in the circumferential direction enables the axial interval at the connection point between the front connection face and the internal connection face, that is, the connection point between the front and rear split pipes, to be movable within an allowable range as described above. If it can be connected, the bending angle between the divided pipes can be regulated within a certain allowable range. As a result, it is possible to prevent the divided pipe from being bent in an unexpected direction due to the resistance of the ground and the soil quality, and to perform accurate curved propulsion construction.

If the buried pipe for curved propulsion has a through hole, a connecting shaft and a regulating member as the connecting means as the connecting means, it has a relatively simple structure.
The function as the connecting means can be reliably achieved. In the curve propulsion method as described above, the telescopic pushing jack and mechanical fixing means are provided between the leading conductor and the auxiliary pipe, and the curve propulsion buried pipe is connected behind the auxiliary pipe, and Adjust and fix the bending angle of the body and auxiliary tube,
If curve propulsion is performed while adjusting the allowable range of the bending angle of each divided pipe body of the curved propulsion buried pipe, the formation of the curved burial hole and the propulsion burial of the buried pipe according to the curved burial hole will be smooth I can do it.

[0037]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the entire structure of the curve propulsion device. The tip conductor 10 has a circular cross section corresponding to the diameter of the buried pipe to be constructed, and is provided with a digging mechanism 11 provided with a digging blade or the like at a head portion, and a driving motor 12 is mounted behind the digging mechanism 11. Have been. If the leading conductor 10 is pushed into the ground while rotating the excavating mechanism 11, a buried hole corresponding to the outer diameter of the leading conductor 10 is formed. In addition, muddy water is supplied to the excavating mechanism 11,
The ground is excavated together with the muddy water and carried out rearward. However, since the muddy water supply mechanism and the earth discharging mechanism are the same as those of a normal propulsion device, they are not shown.

Behind the leading conductor 10, two auxiliary pipes 2
0a and 20b are arranged. Auxiliary pipes 20a, 20
b has substantially the same outer diameter as the leading conductor 10. The front conductor 10 and the auxiliary pipe 20a are connected by a telescopic cylinder 40 attached to the inner surfaces of both pipes and a fixing bolt device 50. As will be described in detail in FIG. 2, the telescopic cylinder 40 is composed of a hydraulic cylinder mechanism, and the cylinder body 4
A flange plate 43 is fixed to the rear end of the support tube 2, and the rear end of the flange plate 43 is fixed to the support member 22 of the auxiliary pipe 20 a via a rotary bearing 44. Therefore, the telescopic cylinder 40 is rotatably attached to the auxiliary pipe 20a. The piston 44 of the telescopic cylinder 40 is provided so as to be able to move in and out of the cylinder body 42. A flange plate 45 is attached to the tip of the piston 44,
In front of the flange plate 45, the piston 44 is provided with a pivot bearing 46.
Is fixed to the support member 13 of the leading conductor 10 through the wire. Therefore, the piston 44, ie, the telescopic cylinder 4
0 means that it is rotatably attached to the leading conductor 10 as well.

As shown in FIG. 3, the telescopic cylinder 40 is
The tip conductor 10 and the auxiliary pipe 20a are provided on all four sides at equal intervals in the circumferential direction of the tip conductor 10 and the auxiliary pipe 20a. If one piston 44 is extended among the telescopic cylinders 40 and 40 arranged at diametrically opposed positions, the distance between the leading conductor 10 and the auxiliary pipe 20a is increased at that position,
If the other piston 44 is contracted, the leading conductor 10
The distance between the auxiliary pipe 20a and the auxiliary pipe 20a is reduced, and the connecting portion between the leading conductor 10 and the auxiliary pipe 20a is bent with the position of the telescopic cylinder 40 having the contracted piston 44 inward. In this way, if the telescopic cylinders 40, 40 provided at the pair of opposed positions are expanded and contracted in opposite directions, the leading conductor 10 and the auxiliary pipe 20a can be bent. However, in the case where the leading conductor 10 and the auxiliary pipe 20a are bent in the direction between the four telescopic cylinders 40, the telescopic cylinders 40 on both sides sandwiching the desired bending direction are simultaneously expanded and contracted at an appropriate ratio. I just need.

Next, the structure of the bolt and nut fixing device 50 will be described with reference to FIG. A flange plate 43 fixed to the cylinder body 42 and a flange plate 45 fixed to the piston 44, a pair of bolt shafts 52 on both sides of the telescopic cylinder 40, parallel to the telescopic cylinder 40,
52 are attached. The bolt head of the bolt shaft 52 is hooked to the flange plate 43 on the cylinder body 42 side so as not to come off, and is formed on the flange plate 45 for the flange plate 45 on the piston 44 side. The bolt shaft 52 is passed through the through hole so that the bolt shaft 52 can freely pass and move in the axial direction. The nuts 47, 47 are provided on the bolt shaft 52 on both sides of the flange plate 45.
Is screwed. If it is tightened so that the flange plate 45 is sandwiched between the pair of nuts 47, 47, at that position,
The bolt shaft 52 and the flange plate 45 are fastened and fixed. If the nuts 47 are loosened and separated from the flange plate 45, the bolt shaft 52 can freely move in the axial direction with respect to the flange plate 45. The thread groove portion of the bolt shaft 52 is set in accordance with the maximum expansion and contraction range of the piston 44, and regardless of the expansion and contraction position of the piston 44, the flange plate 4 is formed by the pair of nuts 47 and 47.
5 and the bolt shaft 52 can be fixed.

As shown in FIG. 1, the telescopic cylinder 40 and the bolt / nut fixing device 50 are provided not only between the leading conductor 10 and the auxiliary pipe 20a but also between the auxiliary pipe 20a and the auxiliary pipe 20.
b. Therefore, the leading conductor device of this embodiment can be bent at two points between the leading conductor 10 and the auxiliary pipe 20a and between the auxiliary pipe 20a and the auxiliary pipe 20b.

A semi-shield jack 60 is attached to the rear part of the auxiliary pipe 20b at a plurality of positions in the circumferential direction. Piston 62 of semi-shield jack 60
Is in contact with the front end of a buried pipe 70 such as a fume pipe. The buried pipes 70 are also sequentially arranged rearward. That is, in this embodiment, the leading conductor 10 and the auxiliary pipes 20a and 20b constitute a leading conductor device in which a plurality of pipes are integrated. To perform the propulsion construction.

Next, FIG. 4 shows a sealing structure at a connecting portion between the leading conductor 10 and the auxiliary pipe 20a. Note that a similar structure is provided at a connection point between the auxiliary pipes 20a and 20b. As shown in FIG.
An elastically deformable seal material 92 is attached to the inner surface of the. The auxiliary pipe 20a is provided with a connection pipe 94 having an outer diameter slightly smaller than the inner diameter of the auxiliary pipe 20a. The connecting pipe portion 94 comes into contact with the inner surface of the sealing material 92, and the leading conductor 10 and the auxiliary pipe body 2
The outer space 0a is sealed off from the inner space.

When the leading conductor 10 and the auxiliary pipe 20a move in the axial direction, the sealing member 92 and the connecting pipe 94 slide with each other, so that the hermetically sealed state can be maintained. As shown in FIG. 4B, when the leading conductor 10 and the auxiliary pipe 20a move so as to be bent, the connecting pipe 94 comes in contact with the sealing material 92 in an inclined state, and the sealing material 92 becomes elastic. By deforming the seal, the hermetically sealed state can be maintained. Therefore, as long as it is within a certain allowable range, no matter what relative movement of the leading conductor 10 and the auxiliary pipe 20a, the hermetically sealed state between the outer space and the inner space is not impaired. Note that, in FIG. 1, since the bent state is schematically shown in an enlarged scale compared to the actual state in order to make it easy to understand the bent state, the front pipe 10 and the auxiliary pipe 20a are displayed as if there is a gap. However, in actuality, as shown in FIG.
4 and sealed off. This is the same between the auxiliary pipes 20a and 20b.

A method for performing the curve propulsion construction using the curve propulsion device having the above structure will be described. First,
Tip conductor 10, auxiliary pipe 20a, and auxiliary pipe 20a
Between 20 and 20b, the bolt / nut fixing device 50 is released so that the piston 44 of the telescopic cylinder 40 can freely expand and contract. To release the bolt and nut fixing device 50, the nuts 47 may be loosened as described above. According to the desired curvature at the point where the tip conductor 10 is to be propelled from now on, the tip conductor 10 and the auxiliary pipe 20a, the auxiliary pipe 20
The connecting point between a and 20b is bent. Specifically, the telescopic cylinders 40, 40 at a plurality of locations are contracted at locations that are inside the bend, and extended at locations that are outside the bend,
The expansion and contraction will be adjusted. Lead conductor 10 and auxiliary tube 2
When 0a and 20b are bent at a predetermined bending angle, the whole of the leading conductor device constitutes a curved tube along a desired curved shape.

After the expansion and contraction adjustment of the telescopic cylinders 40 is completed, if the flange plate 45 is sandwiched and fixed by the nuts 47 and 47 in the fixing bolt device 50, the distance between the front and rear pipes at each telescopic cylinder 40 is determined. Is fixed.
That is, the leading conductor 10 and the auxiliary tubes 20a and 20b are fixed in a state where they are bent at a certain angle.

In this state, when the piston 62 of the semi-shield jack 60 is extended, the leading conductor device portion is
Propelled forward zero. The curved leading conductor device portion is naturally propelled along a curved trajectory, and a curved buried hole is formed. At this time, it goes without saying that the excavation mechanism 11 performs excavation of the ground and discharge of earth and sand at the head of the leading conductor 10.

After the leading conductor device is propelled to a certain distance, the piston 62 of the semi-shield jack 60 is contracted, and a propulsive force is applied to the rear end of the row of the buried pipes 70 by a main pushing jack or the like. The row of buried pipes 70 is propelled along a curved buried hole formed in the leading conductor device portion. By repeating such a process, the formation of the curved buried hole and the burial of the buried pipe 70 into the formed buried hole sequentially progress.

Next, the buried pipe shown in FIGS. 5 to 7 is used in the above-described curve propulsion method. As shown in FIG. 5, the buried pipe 72 has three divided pipe bodies 100 connected in the axial direction. The divided pipe 100 is formed of a steel pipe having a cylindrical shape as a whole, and has an insertion protrusion 120 having an outer diameter slightly smaller than other portions at one end, and a cylinder into which the insertion protrusion 120 is inserted at the other end. It has a concave portion 110. The cylindrical concave portion 110 has a smaller thickness and an inner diameter larger than other portions of the divided pipe body 100. There is a slight gap between the inner diameter of the cylindrical recess 110 and the outer diameter of the insertion protrusion 120.

A sealing member 130 is attached to the outer periphery of the insertion projection 120 on the distal end side. The sealing material 130 is made of rubber or soft synthetic resin, and as shown in detail in FIG.
It has a plurality of fin-like projections 132 projecting to the outer peripheral side. The fin-shaped projection 132 is inclined obliquely outward from the distal end side of the insertion convex part 120 toward the center side of the divided tubular body 100. The outer peripheral tip of the fin-like projection 132 is
To close the gap between the insertion convex portion 120 and the cylindrical concave portion 110, thereby sealing off the inside and outside of the buried pipe 72. Even if the cylindrical concave portion 110 moves or tilts in the axial direction with respect to the insertion convex portion 120, the fin-like projection 132 is elastically deformed, and the sealing function can be maintained.

The distal end of the insertion projection 120 has an annular distal end connecting plate 122 having a constant width from the outer periphery. An internal connecting plate 112 having the same shape as the distal end connecting plate 122 is provided at a position facing the distal end connecting plate 122 of the insertion convex portion 120 inside the cylindrical concave portion 110. In the divided pipe body 100, a rib plate 102 extending in the axial direction is attached between the front end connection plate 122 and the inner connection plate 112 arranged at the front and rear ends, thereby reinforcing the pipe.

The through holes 114 and 124 are provided at the same position as the inner connecting plate 112 and the tip connecting plate 122. Through hole 11
Reference numerals 4 and 124 denote 2 which oppose each other in the diameter direction of the divided pipe body 100.
At each location, two at a slight interval in the circumferential direction,
A total of four are arranged. Bolts 140 are inserted into the through holes 114 and 124. Bolt 140 has a hexagonal head 144 and a threaded screw shaft 142. As shown in FIG. 7, the head 144 of the bolt 140 is disposed outside the internal connection plate 112 via the washer 148 at a location where the internal connection plate 112 and the distal end connection plate 122 face each other, and the screw shaft 142 is provided with a through hole. It protrudes long outside the tip connecting plate 122 through 114 and 124. Through hole 114, 1
The inner diameter of the screw shaft is set to be slightly larger than the outer diameter of the screw shaft 142 so that the screw shaft 142 can be inclined or radially displaced to some extent with respect to the through holes 114 and 124.

Two nuts 146 and 146 are screwed into the screw shaft 142 protruding outside the distal end connecting plate 122 to constitute a so-called double nut. That is, if the nuts 146 and 146 are screwed in opposite directions so as to approach each other, the nuts 146 and 146 are
Fixed to If the nuts 146 and 146 are screwed in opposite directions away from each other, the nuts 146 and 146
2 can move freely. Nut 146
The washer 148 can also be inserted between the and the tip connecting plate 12.

When the nuts 146 and 146 are fixed to the screw shaft 142, the inner connecting plate 112 and the tip connecting plate 122
Can move back and forth or tilt at the interval between the head 144 of the bolt 140 and the nut 146. The buried pipe 72 composed of the divided pipes 100 having the above-described structure is provided with nuts 146 and 14 of the bolts 140 provided at diametrically opposed locations among the connecting locations of the divided pipes 100.
By adjusting the fixing position of 6, the front and rear divided pipes 10
A bendable angle range of 0, 100 can be determined.

For example, as shown in FIG.
With the two bolts 140 provided on one side, the fixing positions of the nuts 146 and 146 are set on the distal end side of the screw shaft 142 so that the distal end connecting plate 122 and the internal connecting plate 142 can move over a wide range. And the two bolts 140, 140 provided on the other side in the diametric direction
The fixed positions of 46 and 146 are moved closer to the head 144 side so that the movable range between the distal end connecting plate 122 and the inner connecting plate 142 is narrowed.

In this state, the front and rear divided pipes 100, 10
In order to bend 0, the side where the movable range between the distal end connecting plate 122 and the internal connecting plate 142 is narrow is inward, and the side where the movable range between the distal end connecting plate 122 and the internal connecting plate 142 is wide is outside, and the division is performed. The tubes 100, 100 can be bent, but the split tubes 100, 100 cannot be bent in the opposite direction. The larger the difference in the movable range between the distal end connecting plate 122 and the inner connecting plate 112 at the two diametrically opposed locations, the more the front and rear divided pipes 100 can be bent.

In order to carry out the curve propulsion method using the buried pipe 72 having the above-described structure, basically, the construction is performed in the same procedure as described above in combination with the curve propulsion device shown in FIG. Good. The buried pipe 72 is formed of each divided pipe 100.
In a state where the pipes are connected in a straight line, if they are transported, stored, or suspended in a shaft, the same handling as that of a normal straight tubular buried pipe can be performed. In this case, at the connection points of the divided pipe bodies 100, the nuts 1 are bolted 140 in all directions so that the internal connection plate 112 and the front end connection plate 122 are integrated.
If 46 and 146 are fixed at positions close to the head 144 side, the buried pipe 72 will not bend during handling.

Before connecting the buried pipe 72 to the rear of the auxiliary pipe body 20b and performing curve propulsion, each divided pipe body 1 of the buried pipe 72 is required.
The range of bendable angles between 00 and 00 is adjusted in accordance with the curvature of the buried hole, that is, the bend angles of the leading conductor 10 and the auxiliary pipes 20a and 20b. Specifically, the bending angle of the tip conductor 10 and the auxiliary pipes 20a and 20b is set to
The angle is set to be about the maximum value of the bendable angle between 00's. For this purpose, at the connecting portion of each divided pipe body 100, an operation of adjusting the fixing positions of the nuts 146 and 146 with respect to the bolt 140 described above is performed.

In such a state, a propulsive force is applied to the row of the leading conductor 10, the auxiliary pipes 20a and 20b, and the row of the buried pipes 72 with a main push jack or the like, so that the entire row is propelled into the ground in a curved shape. Go. As described above, since the bending angle of the leading conductor 10 and the auxiliary pipes 20a and 20b is fixed by the mechanical fixing means, the propulsion is performed according to the fixed bending angle, and the curved burial hole having a predetermined curvature is formed. It is formed.

The buried pipe 72 is propelled along the buried hole by a propulsive force. At this time, the divided pipes 100 are propelled in a curved shape while being bent along the curvature of the buried hole by receiving the resistance force from the ground. And each divided pipe 1
00 can be bent only within the range regulated by the bolts 140 and the nuts 146 and 146 provided at a plurality of locations in the circumferential direction as described above, and can be bent at a predetermined bending angle or more. It cannot bend in different directions. Therefore, the buried pipe 72 is prevented from coming off from the buried hole formed by the leading conductor 10 or the like and being propelled in an unexpected direction, and accurate curved propulsion becomes possible.

After the buried pipe 72 is buried at a predetermined position, concrete is cast on the inner peripheral surface of each of the divided pipes 100. The fastening and sealing of the connection points can be performed. The space surrounded by the inner connecting plate 112, the tip connecting plate 122, and the rib plate 102 is made of concrete.
What is necessary is just to embed it including 40. By doing so, the bending angle of the divided pipe body 100 does not change after construction, and no projection is exposed in the buried pipe 72.

[0062]

According to the curve propulsion method and apparatus according to the present invention described above, the tubes including the leading conductor are bent along the curved shape by the telescopic pushing jack, and then the bent state is obtained. Is fixed by mechanical fixing means, then the curve propulsion of the tube including the tip conductor is performed, so when performing curve propulsion,
All the reaction force received from the ground etc. can be borne by mechanical fixing means, and excessive force is applied to the telescopic pushing jack, and the telescopic pushing jack's telescopic position moves with fluctuation of the reaction force. Does not occur.

As a result, accurate curved propulsion construction along a desired curve shape can be performed, and even if the curved propulsion construction is performed with a large curvature, the telescopic pushing jack is not damaged or malfunction occurs. Therefore, it is possible to eliminate the above-mentioned disadvantages when using the telescopic pushing jack without deteriorating the advantage of the quick and smooth bending operation, which is an advantage of the telescopic pushing jack, and to improve the work efficiency and the quality performance of the curve propulsion method. Can be improved.

As a curved propulsion device, if a telescopic pushing jack includes the cylinder body and the piston and the mechanical fixing means includes the fixed shaft, a guide member and a fastening member, the propulsion of the curved line is performed. Can be performed reliably, the structure is simple, the space is not required, and the manufacturing cost is low. If the buried pipe used in the curve propulsion method is a combination of the divided pipes having the above-described structure, the divided pipes can be bent into a desired curve and smoothly propelled. Construction efficiency can be improved. Moreover, the split tube is
Since it does not bend beyond a predetermined bending angle or bends in the opposite direction, accurate curve propulsion construction becomes possible regardless of construction conditions such as ground conditions.

If the buried pipe for curved propulsion is provided with the above-mentioned through-hole, connecting shaft and regulating member as connecting means, the bending angle of the divided pipe can be accurately determined by a simple operation. It can improve the workability of curve propulsion construction, and since the structure is simple and occupy no space, the production cost of the buried pipe is not increased and the space used in the buried pipe can be sufficiently secured. .

In the above curve propulsion method, the telescopic pushing jack and mechanical fixing means are provided between the leading conductor and the auxiliary pipe, and the curve propulsion buried pipe is connected behind the auxiliary pipe. When the curve propulsion is performed while adjusting the bending angle between the tip conductor and the auxiliary pipe and fixing it, and adjusting the allowable range of the bending angle of each divided pipe of the curve propulsion buried pipe, the curved buried hole And the burial pipe can be smoothly buried in accordance with the formation of the curved buried hole, and the construction accuracy and work efficiency of the curved propulsion method can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a curve propulsion device showing an embodiment of the present invention.

FIG. 2 is an enlarged structural view of a telescopic cylinder and a bolt and nut fixing device.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged sectional view showing a sealing structure and an operation at a connecting portion of a pipe body.

FIG. 5 is a half sectional side view of a buried pipe for curved propulsion.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is an enlarged cross-sectional view of a main part showing a connection structure of the divided pipe bodies in detail.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lead conductor 11 Excavation mechanism 12 Drive motor 20 Auxiliary pipe 40 Telescopic cylinder 50 Bolt and nut fixing device 60 Semi-shield jack 70, 72 Buried pipe 100 Split pipe 110 Cylindrical recess 112 Internal connection plate 114 Through hole 120 Insertion convex part 122 Tip connecting plate 124 Through hole 130 Seal material 140 Bolt 146 Nut

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shigeru Nabeya 390-16 Daifuku, Oaza, Sakurai City, Nara Prefecture (56) References: 1-84393, JP-A (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/06 311

Claims (6)

(57) [Claims] In a curved propulsion method in which a curved buried hole is formed by a leading conductor and a buried pipe is buried along the curved buried hole, a leading conductor and a succeeding pipe connected behind the leading conductor are provided. A plurality of pipes consisting of, at the opposing surfaces, at a plurality of locations in the circumferential direction via telescopic push jacks, while being flexibly connected, adjacent to the telescopic push jack,
When the telescopic push jack is in an arbitrary telescopic state, mechanical fixing means for mechanically fixing the interval between the front and rear pipes is provided, and the front and rear pipes are stretched by the telescopic push jack according to a desired curvature of a propulsion point. A curved propulsion method characterized by bending a plurality of pipes including a leading conductor by applying a propulsion force to the plurality of pipes including a leading conductor after bending the pipe at a predetermined angle and then fixing the bent state by mechanical fixing means. 2. An apparatus for use in the method of claim 1, wherein:
A single conductor or a plurality of auxiliary pipes connected to the back of the leading conductor and the leading conductor are provided, and via a telescopic pushing jack at a plurality of positions in the circumferential direction on the mutually facing surfaces of the leading conductor and the auxiliary pipe,
The leading conductor and the auxiliary pipe are flexibly connected, and the telescopic pushing jack is adjacent to the telescopic pushing jack. A curved propulsion device, wherein a mechanical fixing means for fixing the propulsion device is provided. 3. The apparatus according to claim 2, wherein the telescopic push jack comprises a cylinder body attached to one of the front and rear leading conductors and the auxiliary pipe, and a piston attached to the other, which moves in and out of the cylinder body. A fixed shaft provided on the cylinder body and extending toward the piston; a guide member provided on the piston side for guiding the fixed shaft; and a fixed shaft and a guide at different positions in the axial direction of the fixed shaft. A curve propulsion device comprising: a fastening member for fastening the member. 4. A plurality of divided pipes connected in the axial direction, each of which has a cylindrical recess at one end in the axial direction.
At the other end in the axial direction, there is an insertion protrusion inserted into the cylindrical recess of the other divided tube at a distance in the radial direction, and the cylindrical recess and the insertion protrusion are radially opposed to each other. The cylindrical concave portion and the insertion convex portion are provided with sealing means for hermetically sealing the inside and outside of the tube so that the cylindrical concave portion and the insertion convex portion can relatively move, and a distal end connecting surface disposed at the distal end of the insertion convex portion and the inside of the cylindrical concave portion. At a plurality of locations in the circumferential direction where the distal connection surface of the insertion convex portion and the internal connection surface disposed opposite to each other are connected, the distal connection surface and the internal connection surface are movably connected in the axial direction within an allowable range. And a buried pipe for curved propulsion, comprising a connecting means capable of changing the allowable range. 5. The buried pipe for curved propulsion according to claim 4, wherein:
A connection shaft having a through-hole penetrating the distal connection surface and the internal connection surface, a shaft inserted through the through-hole, and a head locked to the distal connection surface or the internal connection surface; A curve fixed to the shaft portion of the connecting shaft body with the tip connecting surface and the inner connecting surface interposed between the head portion of the shaft body and a regulating member that regulates a movement range between the tip connecting surface and the inner connecting surface; Buried pipe for propulsion. 6. The method according to claim 1, wherein the auxiliary pipe body is provided behind the leading conductor via the telescopic pushing jack and mechanical fixing means, using the buried pipe for curved propulsion according to claim 4 or 5. Connected, the curved propulsion buried pipe is connected behind the auxiliary pipe, and the front and rear pipes are bent at a predetermined angle by a telescopic pushing jack according to the desired curvature of the propulsion point, and then mechanical fixing means After fixing the bending state, and after setting the allowable range of the connecting means of each of the divided pipes so that each of the divided pipes of the buried pipe for curved propulsion is bent at a bending angle corresponding to the desired curvature. A curve propulsion method in which the propulsion force is applied to the leading conductor, the auxiliary pipe, and the buried pipe for curved propulsion, and the buried pipe for curved propulsion is buried in the burial hole.