JP2004052384A - Connecting structure of boring guider and synthetic steel pipe in tunnel boring machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe jacking method of a high-load bearing force one-process system using a synthetic steel pipe in a tunnel boring machine for supposing a steel pipe sheath pipe system. <P>SOLUTION: A connecting pipe 20 is arranged between an excavation guider 10 and the synthetic steel pipe 30. The front face side of the connecting pipe 20 can be connected to the excavation guider 10, and the rear surface side can be connected to the synthetic steel pipe 30, respectively nonrotatably. The inside of the connecting pipe 20 is provided with a steel bar installing part 24 for fixing the front end of an extracting steel bar 72 arranged inside the synthetic steel pipe 30. The inside of the connecting pipe 20 is provided with a mud sending-discharging connecting pipe 25 for connecting a mud sending-discharging pipe port 181 of the excavation guider 10 and a mud sending-discharging pipe 71 on the synthetic steel pipe 30 side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connection structure between a drilled conductor and a synthetic steel pipe of a lateral hole excavator used in a small-diameter pipe propulsion method, and more particularly, to a lateral hole excavator for a steel pipe sheath tube method, in which a steel pipe is replaced with a steel pipe. The present invention relates to a connection structure and the like when a synthetic steel pipe formed by centrifugally forming concrete inside a shell is constructed.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a small-diameter pipe propulsion method for burying water supply and sewage pipes underground and piping, a steel pipe sheath pipe method having a wide application range such as being applicable to various uses is known.
[0003]
The steel pipe sheathing method is a method of using steel pipes (sheath pipes) as propulsion pipes. While excavating the ground with the conductor to be excavated, sequentially pushing and welding the steel pipes behind it, pushing and propelling, In this method, a sewer main pipe, a water main pipe, a power cable, and the like are inserted into a steel pipe (sheath pipe), and the surrounding area is filled with concrete or the like.
[0004]
In this steel pipe sheathing method, the excavated conductor, the leading steel pipe, and the steel pipe to be successively connected are connected by welding, so in the event of an unexpected situation, the steel pipe being propelled is pulled from the starting shaft side. Can be pulled back one by one.
[0005]
On the other hand, a high-load-bearing one-step method using a synthetic steel pipe formed by centrifugally forming concrete in a steel pipe is also known. This synthetic steel pipe can be used as a water and sewage pipe as it is like a general fume pipe, and can be connected by inserting the front part of the following pipe into the rear part of the preceding pipe. For this reason, the high load-bearing one-step method using the synthetic steel pipe eliminates the need for the main pipe insertion step and filling step after propulsion as in the steel pipe sheathing method, and also eliminates the welding work for connecting the steel pipes. Thus, the construction period can be shortened and the construction cost can be reduced.
[0006]
[Problems to be solved by the invention]
However, conventionally, in a horizontal hole excavator which is assumed to adopt a steel pipe sheathing method, a high load-bearing one-step method using a synthetic steel pipe cannot be adopted due to a difference in pipe type.
[0007]
That is, since the synthetic steel pipe is connected by a plug-in type, it is strong against compression acting during excavation but weak against tension. Therefore, even if an unexpected situation occurs, the synthetic steel pipe cannot be pulled back from the starting shaft like a steel pipe, and special measures need to be taken separately.
[0008]
Further, since the concrete layer is formed on the synthetic steel pipe, the inner diameter is smaller than that of the steel pipe. Therefore, there is also a problem that the feed and discharge mud pipe for discharging earth and sand from the excavated conductor interferes at the height position of the concrete layer inside the synthetic steel pipe.
[0009]
The present invention has been made in view of the above circumstances, and realizes a high load-bearing one-step propulsion method using a synthetic steel pipe in a side-hole excavator that is supposed to perform a steel pipe sheathing method. It is an object of the present invention to provide a connection structure between a drilled conductor and a synthetic steel pipe in a lateral hole excavator capable of forming a hole.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a lateral hole for excavating by pushing a steel pipe to a backside of an excavated conductor for excavating earth and sand or rocks in the ground while sequentially welding and connecting the steel pipe with a propulsion jack installed in a starting shaft. In the excavator, concrete is centrifugally molded inside the outer shell of the steel pipe, and it can be connected sequentially by inserting the front part of the succeeding pipe at the rear of each pipe, and the detent provided at the front of each pipe A synthetic steel pipe to which each pipe is connected so that it cannot rotate relative to each other by fitting into a fitting hole provided at the rear part of each preceding pipe of the preceding pipe, and the excavated conductor for construction in place of the steel pipe. A connection structure for connecting the synthetic steel pipe, wherein a connection pipe disposed between the excavated conductor and the synthetic steel pipe, provided on a front side of the connection pipe, relative to a rear surface of the excavated conductor. Front contact that is non-rotatably and non-separably connected A rear connection portion provided on the rear surface side of the connection pipe and connected to the synthetic steel pipe by inserting a front portion of the synthetic steel pipe; and a rear connection portion provided on the rear surface side of the connection pipe, A fitting hole that is connected to the synthetic steel pipe so that it cannot rotate relative to the synthetic steel pipe by fitting the detent projection provided on the front part of the synthetic steel pipe connected by the side connection part; A mounting portion for fixing a front end of a drawing steel rod reaching the starting shaft through the inside of the synthetic steel pipe which is sequentially connected, and a mounting portion provided inside the connection pipe and excavated from the excavated conductor. Mud connection for connecting the mud pipe on the rear surface of the excavated conductor and the mud pipe connected to the starting shaft so as to penetrate the synthetic steel pipe which is sequentially connected so as to discharge with the water flow And a pipe.
[0011]
According to such a connection structure, since the connection pipe has the rear connection part connected to the synthetic steel pipe by inserting the front part of the synthetic steel pipe, similar to the case of connecting each synthetic steel pipe, The synthetic steel pipe can be easily connected to the connecting pipe in a short time without requiring a welding operation.
[0012]
Further, the excavated conductor and the connection pipe are connected so as to be relatively non-rotatable, and the leading pipe and the connection pipe of the synthetic steel pipe are fitted with the detent projections provided on the synthetic steel pipe side in the fitting holes of the connection pipe. Since the rotation is prevented by joining, all relative rotations of the excavated conductor, the connecting pipe, and the synthetic steel pipe inserted into the lateral hole can be prevented, and the lateral hole can be efficiently excavated.
[0013]
In addition, the connection pipe is a synthetic steel pipe that is weak against pulling because it is connected by a plug-in method, but the connection pipe is provided with a front end portion of a steel rod for drawing that passes through the inside of the sequentially connected synthetic steel pipe and reaches the starting shaft. In the event of an unforeseen situation, the steel pipe for pulling is pulled from the starting shaft side to pull the connecting pipe toward the starting shaft side, so that the synthetic steel pipes sequentially connected by this Can be pulled back from the head side in the pulling-back direction while applying a compressive force, and the excavated conductor connected irremovably to the connecting pipe can be pulled back together.
[0014]
Also, the case where the height position of the mud pipe on the synthetic steel pipe side smaller in inner diameter than the steel pipe due to the formation of the concrete layer is higher than the height position of the mud pipe port on the conductor side of the excavation destination. However, since the connecting pipe is provided with the sending and discharging mud connecting pipe that connects the two, the earth and sand excavated by the excavated conductor can be reliably discharged to the starting shaft side, and a smooth excavating operation can be realized.
[0015]
As described above, according to the connection structure according to the present invention, the steel pipe and the synthetic steel pipe are used to overcome the difference in the pipe type, and the steel pipe is replaced by using the side hole excavator which is assumed to perform the steel pipe sheathing method. In addition, it is possible to realize a one-step propulsion method with a high load-bearing capacity using a synthetic steel pipe.
[0016]
In addition, by implementing the one-step method with high load-bearing capacity using synthetic steel pipes, the main pipe insertion step and filling step after propulsion, such as the steel pipe sheath pipe method, and the welding work of the steel pipe connection are also unnecessary, and the construction period Shortening and reduction of construction costs can be achieved.
[0017]
The present invention also relates to a horizontal hole excavator that excavates by pushing a steel jack on a starting jack installed in a starting shaft while sequentially welding and connecting a steel pipe to a rear side of an excavating conductor for excavating earth and sand or rocks in the ground, Concrete is centrifugally molded inside the outer shell of the steel pipe, which can be connected sequentially by inserting the front part of the succeeding pipe into the rear part of each pipe, and the detent projections provided at the front part of each pipe lead. The synthetic steel pipes to which the respective pipes are connected to each other so as to be relatively non-rotatable by fitting into fitting holes provided at the rear portion of the respective pipes, the inside of the synthetic steel pipes which are sequentially connected in place of the steel pipes for construction. A support portion for supporting a drawing steel rod and a feed / discharge mud pipe which are provided through the inside of the synthetic steel pipe, respectively, and each of the support portions is provided below the synthetic steel pipe. And hold it near the side inner wall. A connecting portion for connecting the supporting portions, and a protection contact portion made of synthetic resin provided at a contact portion with the lower and side inner walls in the synthetic steel pipe. It is.
[0018]
Unlike a steel pipe, a synthetic steel pipe has a concrete layer and therefore has a smaller inner diameter.However, according to such a support body, a drawing steel rod and a feed / discharge pipe disposed in the synthetic steel pipe are located below and inside the pipe. Since it can be held near the lateral inner wall, the central portion of the cross section of the synthetic steel pipe being propelled can be a gap. Thus, a guide beam can be irradiated from the starting shaft to the excavation target direction, for example, by utilizing the central portion of the cross section of the pipe that has become an air gap. It is possible to easily and surely determine and correct the straightness of the excavation direction of the body.
[0019]
In addition, since the support body is provided with a protection contact portion made of synthetic resin provided at a portion in contact with the lower and side inner walls in the synthetic steel pipe, it is possible to prevent the inner wall of the synthetic steel pipe from being damaged. Can be prevented.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic diagram of the overall system configuration of a lateral excavator according to an embodiment of the present invention.
[0021]
As shown in this figure, the system constituting the horizontal excavator includes, as main components, a conductor 10 to be excavated, a connecting pipe 20, a synthetic steel pipe 30 as a propulsion pipe, a propulsion machine 40 installed in a starting shaft, Ground facilities including a sewage treatment section 51, a lubricant supply section 52, an operation panel 53, a hydraulic unit 54, a generator 55, and the like, which are installed around the shaft, are provided.
[0022]
The excavation destination conductor 10 excavates the ground by the cutter head 11, and is pushed by the propulsion device 40 from the departure shaft while excavating while the synthetic steel pipes 30 are sequentially connected to the excavation ground.
[0023]
FIG. 2 is a schematic perspective view showing the excavation destination conductor 10 and the propulsion device 40 set in the starting shaft.
[0024]
As shown in this figure, a conductor 10 to be excavated includes a cutter head 11 provided at the head thereof, a crusher cone 12 for crushing earth and sand or rock fragments excavated by the cutter head 11, a cutter motor 13 for driving the cutter head 11, and the like. A plurality of direction correcting jacks 14 for adjusting the excavation direction; a target box 15 for receiving a guide beam for guiding the excavation direction; a camera box 16 for photographing the target box 15; Tubes 18 and 18 are provided.
[0025]
The propulsion device 40 transmits the propulsion frame 41 installed in the starting shaft, the pair of left and right propulsion jacks 42, 42 operating in the excavation direction on the propulsion frame 41, and the pressing driving force of the propulsion jacks 42, to the excavation destination conductor 10. To do this, a pusher fitting 43 for pushing the back surface of the excavated conductor 10 or the synthetic steel pipe 30, a guide beam irradiator 44 for irradiating a guide beam for guiding the excavation direction, and a reaction force for supporting the propulsion frame 41 against the propulsion reaction force A plate 45 and a water stop hole 46 for preventing water leakage from the excavated lateral hole are provided. The pusher fitting 43 is provided with a projection that fits into a fitting hole 37 provided on the rear surface of the synthetic steel pipe 30 as described later, and prevents rotation between the propulsion device 40 and the last synthetic steel pipe 30 during propulsion. It is planned.
[0026]
3 is a longitudinal sectional view of the connecting pipe 20 and the synthetic steel pipe 30, FIG. 4 is a detailed longitudinal sectional view of the connecting pipe 20, FIG. 5 is a rear perspective view of the connecting pipe 20, and FIG. It is a partially cutaway perspective view.
[0027]
As shown in these drawings, the connecting pipe 20 is disposed between the excavated conductor 10 and the synthetic steel pipe 30. When the excavation process is completed, the connection pipe 20 is not carried out from the reaching shaft and is not laid in the excavated lateral hole. Further, as the first pipe 301 of the synthetic steel pipe 30, a pipe shorter than the subsequent pipes 302... Is adopted in order to easily secure workability at the beginning of excavation.
[0028]
The outer shape of the connection pipe 20 is formed by a steel pipe main body 21.
[0029]
The front edge side of the pipe main body 21 is formed thick in both the radial direction and the front-rear direction, and bolt holes (front connection portions) 211... For connection to the rear surface of the excavation destination conductor 10 are provided here. . The bolt holes 211 are provided at six locations at substantially equal intervals in the circumferential direction, for example. On the other hand, bolt holes 17 for connecting to the connection pipe 20 are also provided on the excavation destination conductor 10 side, and the excavation destination conductor 10 and the connection pipe are connected by bolting with the bolt holes 211 on the connection pipe 20 side. 20 are connected so that they cannot rotate relative to each other and cannot be separated. Note that the connection between the connection pipe 20 and the excavation destination conductor 10 may be a connection mode other than the bolt connection as long as the connection pipe 20 and the excavation destination conductor 10 cannot be relatively rotated and cannot be separated from each other.
[0030]
An injection hole 212 for a lubricant or a chemical solution is provided at an upper portion of a substantially central portion in the front-rear direction of the tube main body 21.
[0031]
The rear portion of the tube main body 21 has a slightly reduced outer diameter and is formed with a small diameter portion 213 having two grooves in the circumferential direction, and a seal portion 22 made of an elastic material such as rubber is wound around the groove. In a state where watertightness is maintained, a collar 23 made of a steel plate is covered on the outside thereof. The collar 23 constitutes a rear connection portion connected to the synthetic steel tube 30 in a plug-in manner by inserting a front portion of the synthetic steel tube 30 into the inside thereof.
[0032]
At the upper part of the rear surface of the pipe main body 21, a rotation preventing projection 36 of the synthetic steel pipe 30, which will be described later, is fitted, and a fitting hole 214 for connecting the connection pipe 20 and the synthetic steel pipe 30 so that they cannot rotate relatively is provided. I have.
[0033]
According to such a structure, since the connection pipe 20 is prevented from rotating relative to the excavated conductor 10 and the synthetic steel pipe at the front connection part and the rear connection part, it is possible to efficiently excavate the horizontal hole.
[0034]
In the vicinity of the rear part in the pipe main body 21, steel rod mounting parts 24, 24 for fixing the front ends of the drawing steel rods 72, 72 are provided on both left and right sides thereof. The synthetic steel pipe 30 is connected to the pull-out steel rods 72 and 72 by a plug-in method, so that the synthetic steel pipe 30 that is weak in tension can be pulled back to the starting shaft when an unexpected event occurs. It is a steel bar arranged inside.
[0035]
In the steel rod mounting portions 24, 24, mounting holes 242, 242 are formed in ribs 241, 241 provided so as to protrude inward from the left and right sides of the rear portion of the tube body 21, respectively, and support fittings 243, 243 are provided here. It is configured to be mounted.
[0036]
The front portions of the support brackets 243 and 243 are forwardly threaded through the mounting holes 242 and 242, and are externally threaded. Two nuts 244. Further, female screws are cut at rear portions of the support brackets 243 and 243, and front ends of the steel rods 72 and 72, which are cut with male screws, are screwed and fixed. Further, the nuts 244, 244 passed through the steel bars 72, 72 for pulling are tightened toward the support brackets 243, 243, so that the steel bars 72, 72 for pulling are securely attached to the support brackets 243, 243 at their front ends. It is supposed to be.
[0037]
By providing such steel rod mounting portions 24, 24 in the connecting pipe 20 on the front side of the synthetic steel pipe 30, in the event of an unexpected situation, the pulling steel rods 72, 72 are pulled from the starting shaft. Thus, the connecting pipe 20 is pulled toward the starting shaft, whereby the sequentially connected synthetic steel pipes 30 can be pushed from the leading side in the pulling direction and pulled back while applying a compressive force. In this pull-back operation, instead of the pusher fitting 43 described above, a puller fitting capable of attaching the rear ends of the pull-back steel rods 72, 72 in a retaining state is attached to the propulsion device 40, and the propulsion force of the propulsion jack 42 is attached. By acting in reverse.
[0038]
In the lower part of the pipe main body 21, in order to discharge excavated earth and sand from the excavated conductor 10 together with the water flow, the pipes 18, 18 on the excavated conductor 10 are connected to the pipelines 71, 71 on the synthetic steel pipe 30. Mud communication pipes 25, 25 are provided. The pipeline for discharging the excavated sediment includes a water supply pipeline for sending a water flow from the starting shaft to the excavating conductor 10, and a mud flow in which the excavated sediment is mixed with the water flow from the excavating conductor 10 to the starting shaft. It consists of two pipes, a return pipe and a return pipe.
[0039]
The height positions of the pipe openings 181 and 181 of the conduits 18 and 18 on the side of the excavation destination conductor 10 are located near the bottom of the excavation destination conductor 10. This is because the excavation destination conductor 10 is based on the steel pipe sheathing method and is adjusted to the inner bottom height position of the steel pipe used for the steel pipe sheathing method. In other words, the pipe used in the steel pipe is usually placed on the inner bottom of the steel pipe, but the height of the inner bottom of the steel pipe is slightly higher than the lower surface of the outside of the pipe by the thickness of the steel plate. Because there is only
[0040]
On the other hand, in the synthetic steel pipe 30 used in place of such a steel pipe, since the concrete layer is formed inside the steel pipe outer shell, the inner bottom height is located higher than the steel pipe.
[0041]
The mud feeding / discharging communication pipes 25, 25 provided in the connecting pipe 20 are connected to such a mud sending / discharging pipe port 181 in the excavation destination conductor 10 at pipe connecting portions 252, 252 at a front portion thereof, and at a rear portion thereof. It is connected to a feed / discharge mud pipe 71 provided in the synthetic steel pipe 30. For this reason, the middle part in the front-back direction of the feeding and discharging mud connecting pipes 25, 25 is bent so that the rear side (the synthetic steel pipe 30 side) is higher than the front side (the excavation destination conductor 10 side). Further, the rear part of the feed / discharge communication pipes 25, 25 is supported from below by a pipe receiver 251 at the height position of the feed / discharge mud pipe 71 in the synthetic steel pipe 30. By such feed / discharge communication pipes 25, 25, the earth and sand excavated by the excavation destination conductor 10 can be reliably discharged to the starting shaft, and a smooth excavation work can be realized.
[0042]
The synthetic steel pipe 30 is formed by centrifugally forming a concrete part 32 inside a steel pipe outer shell 31. The front part of the synthetic steel pipe 30 is an insertion part 33 having a small outer diameter, and the rear part is an insertion receiving part 35 into which the insertion part 33 of the subsequent pipe can be inserted. Around the insertion portion 33, a seal portion 34 made of an elastic material such as rubber is wound around two lines, and the insertion portion 33 of the following tube is inserted into the insertion receiving portion 35 of the preceding tube. In a state where both pipes are connected, a watertight state is maintained.
[0043]
On the front surface side of the insertion portion 33, a detent protrusion 36 projecting forward is provided, and on the rear surface side of the insertion receiving portion 35, a detent protrusion is provided at a position corresponding to the detent protrusion 36. A fitting hole 37 into which a can be inserted is formed. Thereby, when each synthetic steel pipe 30 is connected by inserting the insertion part 33 of the succeeding pipe into the insertion receiving part 35 of the preceding pipe, the two pipes are prevented from rotating relative to each other. I have.
[0044]
At the middle part in the front-rear direction of each synthetic steel pipe 30, two suspending portions 38, 38 for hanging the synthetic steel pipe 30 by a crane or the like when carrying the synthetic steel pipe 30 into the starting shaft are formed so as to be dug into the inside of the pipe. Have been.
[0045]
In addition, such a synthetic steel pipe 30 includes one in which the inner surface of the concrete portion 32 is surface-coated (inner lining) with a synthetic resin or the like, or one in which concrete is exposed on the inner surface.
[0046]
In the inside of such a synthetic steel pipe 30, during the horizontal hole excavation, the above-mentioned sending and discharging mud pipes (slurry pipes) 71, 71, the drawing steel rods 72, 72, and further, the drive control of the excavating conductor 10 from the starting shaft side. Power lines, control signal lines, hydraulic pipes, and the like.
[0047]
Specifically, the synthetic steel pipe 30 is successively added behind the last synthetic steel pipe 30 at the starting shaft each time the excavated conductor 10 digs for a predetermined distance. , 71 are connected by pipe fittings 74, 74, and the pull-out steel bars 72, 72 are connected by couplers 73, 73.
[0048]
Further, a guide beam for ensuring the straightness of excavation irradiated from the guide beam irradiator 44 in the starting shaft passes through the synthetic steel pipe 30 and in a substantially central region of the cross section of the pipe. For this reason, in each of the synthetic steel pipes 30, the above-described feed / discharge mud pipes 71, 71 and the drawing steel rods 72, 72 are arranged so that a gap for passing the guide beam can be secured in a substantially central region of the pipe cross section. A support body 60 that stably supports the position is attached.
[0049]
FIG. 7 is a perspective view showing a use state of the support body 60 in which a part of the synthetic steel pipe is cut away, and FIG. 8 is a cross-sectional view of the inside of the synthetic steel pipe 30.
[0050]
The support body 60 has an arc shape substantially along the inner peripheral surface of the synthetic steel pipe 30, and includes an arc-shaped frame body 61 extending from the inner bottom to the left and right sides in the synthetic steel pipe 30. At the center in the left-right direction of the arc-shaped frame 61, a feeding and discharging pipe holding metal fitting 62 is detachably attached by a thumb screw 63. The arc-shaped frame 61 and the feed / discharge pipe holding member 62 form a feed / discharge pipe supporting portion 64 that sandwiches and supports the feed / discharge pipes 71 from above and below. The mud pipes 71 are supported by the mud pipe support 64 near the lower inner wall of the synthetic steel pipe 30.
[0051]
Further, steel bar support portions 65, 65 for supporting the drawing steel bars 72, 72 are provided at the left and right end portions of the arc-shaped frame 61, respectively. The steel bar supporting portions 65 support the drawing steel bars 72 near the inner walls on both left and right sides of the synthetic steel pipe 30.
[0052]
As described above, the arc-shaped frame 61 functions as a connecting portion that connects the feeding / discharging pipe supporting portion 64 and the steel rod supporting portions 65, 65 while positioning them at predetermined positions. Further, protection contact portions 66, 66 made of a soft material such as a synthetic resin are provided below the arc-shaped frame body 61 at a position in contact with the inner wall surface obliquely below the left and right in the synthetic steel pipe 30. , Mounted with screws. The support body 60 is positioned in the synthetic steel pipe 30 without damaging the inner surface of the synthetic steel pipe 30 by contacting the inner surfaces of the synthetic steel pipe 30 at the protection contact portions 66, 66.
[0053]
According to such a support body 60, the feeding / discharging pipes 71, 71 and the drawing steel rods 72, 72 in the synthetic steel pipe 30 are stably positioned near the inner wall of the pipe. Power lines, control signal lines, hydraulic lines, and the like are also provided in the synthetic steel tube 30. These lines are generally flexible, and therefore, are provided with the sending / discharging pipes 71, 71 and the drawing steel rods 72, 72. It can be easily positioned in the vicinity of the inner wall by winding around. In this way, when the pipes and the like disposed in the synthetic steel pipe 30 are positioned near the inner wall thereof, the inner diameter is smaller than that of the steel pipe used for the steel pipe sheath because the concrete section 32 is provided. Although the synthetic steel pipe 30 is easily occupied by a mud pipe or the like, a central area of the pipe can be secured as a void.
[0054]
As a result, as shown by a virtual target 19 in FIG. 8, a region through which the guide beam passes is illuminated with the guide beam in the central portion of the tube that has become the void, and the excavated conductor 10 travels straight in the digging direction. Sex determination and correction can be easily and reliably performed.
[0055]
According to the connection structure using the connection pipe 20 as described above, the difference in the pipe type between the steel pipe and the synthetic steel pipe is overcome while using the side hole excavator supposed to perform the steel pipe sheathing method. Instead, a high load-bearing one-step propulsion method using synthetic steel pipes can be realized, and by implementing a high load-bearing one-step method using synthetic steel pipes, the main pipe after propulsion such as a steel pipe sheath pipe method can be realized. The insertion step, the filling step, and the welding work of the steel pipe connection are not required, so that the construction period can be shortened and the construction cost can be reduced.
[0056]
Moreover, according to the support body 60 as described above, while using a synthetic steel pipe having a small inner diameter, a gap is secured at the center thereof to enable use of the guide beam, and straight excavation can be reliably realized. .
[0057]
As described above, the present invention has been described based on one embodiment, but the present invention is not limited to the above, and it goes without saying that various modifications may be made without departing from the scope of the invention.
[0058]
【The invention's effect】
As described above, according to the connection structure of the excavated conductor and the synthetic steel pipe in the horizontal hole excavator according to the present invention, while using a horizontal hole excavator that is assumed to perform a steel pipe sheathing method, a pipe called a steel pipe and a synthetic steel pipe is used. Overcoming the differences between types, realizing a high-load-bearing one-step propulsion method using synthetic steel pipes instead of steel pipes, eliminating the need for main pipe insertion and filling processes after excavation and welding work for steel pipe connections. It is possible to shorten the period and reduce the construction cost.
[0059]
In addition, according to the support body in the lateral hole excavator, it is possible to irradiate a guide beam that guides the excavation target direction to the central portion of the cross section of the synthetic steel pipe as a gap, thereby enabling the straightness of the excavation direction to be improved. Determination and correction can be performed easily and reliably.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of the overall configuration of a lateral excavation machine according to an embodiment of the present invention.
FIG. 2 is a partially cutaway perspective view of the main body of the lateral excavation machine.
FIG. 3 is a longitudinal sectional view of a connecting pipe and a synthetic steel pipe.
FIG. 4 is a detailed longitudinal sectional view of a connecting pipe.
FIG. 5 is a rear rear perspective view of a connection pipe.
FIG. 6 is a partially cutaway perspective view of a synthetic steel pipe.
FIG. 7 is a perspective view showing a use state of the support body.
FIG. 8 is a sectional view showing an internal state of the synthetic steel pipe.
[Explanation of symbols]
10 Excavation destination conductor 18 Feeding / discharging pipe 181 Sending / discharging pipe port 19 Target 20 Connecting pipe 211 Bolt hole (front side connection part)
214 fitting hole 22 seal part 23 collar (rear connection part)
24 Steel rod attachment part 25 Feeding and discharging mud connecting pipe 30 Synthetic steel pipe 31 Steel pipe outer shell part 32 Concrete part 33 Insertion part 34 Seal part 35 Insertion receiving part 36 Detent stopper 37 Fitting hole 40 Propulsion unit 41 Propulsion frame 42 Propulsion jack 43 Pusher fitting 44 Guide beam irradiator 60 Support body 61 Arc-shaped frame (connection part)
62 Sludge pipe holding fitting 63 Thumb screw 64 Sludge pipe support part 65 Steel rod support part 66 Protection contact part 71 Sludge pipe (slurry pipe)
72 Steel bar for drawing

Claims (2)

While welding and connecting steel pipes sequentially to the back of the excavated conductor to excavate earth and sand and rocks in the ground, pushing this with a propulsion jack installed in the starting shaft and excavating it,
Concrete is centrifugally molded inside the outer shell of the steel pipe, which can be connected sequentially by inserting the front part of the succeeding pipe into the rear part of each pipe, and the detent projections provided at the front part of each pipe lead. The excavated conductor and the synthetic steel pipe are used to construct a synthetic steel pipe to which the respective pipes are connected to each other so as to be relatively non-rotatable by being fitted into a fitting hole provided at a rear portion of each pipe. Connection structure for connecting
A connection pipe disposed between the excavated conductor and the synthetic steel pipe,
A front connection portion provided on the front side of the connection pipe and connected to the rear surface of the excavation destination conductor so as to be relatively non-rotatable and non-separable,
A rear connection portion provided on a rear surface side of the connection pipe and connected to the synthetic steel pipe by inserting a front portion of the synthetic steel pipe,
The detents provided on the rear side of the connection pipe and provided on the front part of the synthetic steel pipe connected at the rear connection part are fitted to prevent relative rotation with the synthetic steel pipe. A mating hole to be connected;
An attachment portion that is provided inside the connection pipe and fixes a front end of a drawing steel rod that reaches the starting shaft through the inside of the synthetic steel pipe that is sequentially connected,
A starting shaft is provided inside the connecting pipe and penetrates through the synthetic steel pipe which is sequentially connected to a feed and discharge mud pipe opening on the rear surface of the excavating conductor so as to discharge excavated earth and sand from the excavating conductor together with a water flow. A mud pipe connecting the mud pipe connected to the
A connection structure between a leading conductor and a synthetic steel pipe in a horizontal hole excavator, comprising: While welding and connecting steel pipes sequentially to the back of the excavated conductor to excavate earth and sand and rocks in the ground, pushing this with a propulsion jack installed in the starting shaft and excavating it,
Concrete is centrifugally molded inside the outer shell of the steel pipe, which can be connected sequentially by inserting the front part of the succeeding pipe into the rear part of each pipe, and the detent projections provided at the front part of each pipe lead. The synthetic steel pipes to which the respective pipes are connected to each other so as to be relatively non-rotatable by fitting into fitting holes provided at the rear portion of the respective pipes, the inside of the synthetic steel pipes which are sequentially connected in place of the steel pipes for construction. A support body disposed in the
A support portion for supporting a drawing steel rod and a feeding / discharging pipe each disposed through the synthetic steel pipe;
A connecting portion that connects the support portions so as to hold the support portions near the lower and side inner walls of the synthetic steel pipe,
A protection contact portion made of a synthetic resin provided at a contact portion with the lower and side inner walls in the synthetic steel pipe,
A support body for a horizontal hole excavator, comprising:

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