JP3834273B2 - Connection structure between the drilling conductor and the synthetic steel pipe in the horizontal hole excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure between a drilled conductor and a synthetic steel pipe of a horizontal hole excavator used in a small-diameter pipe propulsion method, and more specifically, in a horizontal pipe excavator for a steel pipe sheath or pipe method, The present invention relates to a connection structure in the case of constructing a synthetic steel pipe formed by centrifugally molding concrete inside a shell.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a small-diameter pipe propulsion method in which water and sewage pipes are buried underground, steel pipe sheaths having a wide range of applications such as being applicable to various applications are known.
[0003]
This steel pipe sheath method is a construction method that uses a steel pipe (sheath pipe) as a propulsion pipe. While excavating the ground with a drilling destination conductor, the steel pipe is sequentially pushed and welded behind it, and then propelled. In this method, a sewer main, a water main, a power cable, etc. are inserted into a steel pipe (sheath pipe) and the surroundings are filled with concrete or the like.
[0004]
In this steel pipe sheath method, the drilled conductor, the leading steel pipe, and the steel pipes that are successively connected are connected by welding, so if an unexpected situation occurs, the steel pipe that was propelled is pulled from the start shaft side. Can be pulled back sequentially.
[0005]
On the other hand, a high load resistance one-step method using a synthetic steel pipe or the like obtained by centrifugally molding 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 succeeding pipe into the rear part of the preceding pipe. For this reason, this high load-bearing one-process system using synthetic steel pipe eliminates the main pipe insertion process and filling process after propulsion like the steel pipe sheath and pipe system, and does not require welding work to connect 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 that is supposed to adopt a steel pipe sheath or pipe method, a high load resistance one-step method using a synthetic steel pipe could not be adopted due to the difference in pipe type.
[0007]
That is, since the synthetic steel pipes are connected by a plug-in type, they are strong against compression acting during excavation but weak against tension. Therefore, even if an unforeseen situation occurs, the synthetic steel pipe cannot be pulled back from the start shaft side like the steel pipe, and special measures need to be taken separately.
[0008]
Moreover, since the concrete layer is formed in the synthetic steel pipe, its inner diameter is smaller than that of the steel pipe. Therefore, there is also a problem that the sending / discharging mud pipe for discharging the 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 in a horizontal hole excavation machine that is supposed to perform a steel pipe sheath pipe method, to achieve a high load-bearing one-step propulsion method using a synthetic steel pipe An object of the present invention is to provide a connection structure between a drilled conductor and a synthetic steel pipe in a horizontal hole excavating machine capable of performing the above.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a horizontal hole for excavating by pushing a steel pipe to a rear end of a drilling shaft while sequentially welding and connecting a steel pipe to the rear side of a drilling conductor for excavating earth and sand or rock in the ground. In the excavator, concrete is centrifugally molded inside the steel shell and can be connected in sequence by inserting the front part of the pipe following the rear part of each pipe, and the detent provided at the front part of each pipe. In order to construct a synthetic steel pipe in which each pipe is connected in a relatively non-rotatable manner by fitting into a fitting hole provided in the rear part of each pipe preceded by a protrusion, the excavation destination conductor and A connection structure for connecting the synthetic steel pipe, the connection pipe arranged between the excavation tip conductor and the synthetic steel pipe, provided on the front side of the connection pipe, and relative to the rear surface of the excavation tip conductor Front side connection, non-rotatable and non-separable Provided on the rear surface side of the connecting pipe, the rear connecting portion connected to the synthetic steel pipe by inserting the front portion of the synthetic steel pipe, and provided on the rear surface side of the connecting pipe. A fitting hole that is connected to the synthetic steel pipe so as not to rotate relative to the synthetic steel pipe by fitting the anti-rotation protrusion provided at a front portion of the synthetic steel pipe connected by a side connection portion; And a mounting portion for fixing a front end portion of a steel rod for drawing that passes through the inside of the synthetic steel pipes that are sequentially connected to the start shaft, and is provided inside the connecting pipe, and is excavated from the excavation tip conductor In order to discharge the water along with the water flow, the sludge connection is connected to the sludge pipe connected to the start shaft so as to penetrate the synthetic steel pipe sequentially connected to the feed sludge pipe port on the rear surface of the drilled conductor And a tube.
[0011]
According to such a connection structure, since the connecting pipe has a rear side connecting portion connected to the synthetic steel pipe by inserting the front portion of the synthetic steel pipe, similarly 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 welding work.
[0012]
In addition, the excavation tip conductor and the connecting pipe are connected so as not to rotate relative to each other, and the leading end pipe and the connecting pipe of the synthetic steel pipe are fitted with the non-rotating projections provided on the synthetic steel pipe side in the fitting holes of the connecting pipe. Since the rotation prevention is achieved by combining, it is possible to prevent the relative rotation of all of the excavation destination conductor, the connecting pipe and the synthetic steel pipe inserted into the horizontal hole, and to efficiently excavate the horizontal hole.
[0013]
In addition, although it is a synthetic steel pipe that is weak to pull because it is connected by a plug-in type, the connecting pipe is provided with a front end portion of a steel rod for drawing that reaches the start shaft through the inside of the sequentially connected synthetic steel pipe. When the unexpected situation occurs, the connecting pipe is pulled to the start shaft side by pulling the steel rod for pulling from the start shaft side, and the synthetic steel pipes sequentially connected by this Can be pulled back from the leading side while applying a compressive force, and the excavation tip conductor connected to the connecting pipe so as not to be separated can be pulled back together.
[0014]
In addition, because the concrete layer is formed, the height of the feeding / discharging mud pipe on the synthetic steel pipe side whose inner diameter is smaller than that of the steel pipe is higher than the height position of the feeding / discharging mud pipe port on the drilling destination conductor side. However, since the connecting pipe is provided with the feed / drain mud connecting pipe that connects the two, the earth and sand excavated by the excavation destination conductor can be surely discharged to the start shaft side, and smooth excavation work can be realized.
[0015]
As described above, according to the connection structure according to the present invention, while using the horizontal hole excavator that is supposed to perform the steel pipe sheath, the difference between the pipe types of the steel pipe and the synthetic steel pipe is overcome, and the steel pipe is replaced. In addition, it is possible to realize a one-process propulsion method with a high load bearing capacity using synthetic steel pipes.
[0016]
And by carrying out a high load resistance one-process method using synthetic steel pipes, there is no need for main pipe insertion and filling processes after propulsion like steel pipe sheaths and pipe work, and welding work for connecting steel pipes. Shortening and construction cost can be reduced.
[0017]
In addition, in a horizontal hole excavator where a steel pipe is sequentially welded and connected to the rear side of a drilling conductor for excavating earth and sand and rocks in the ground, and this is pushed by a propulsion jack installed in a start shaft, Concrete is centrifugally molded inside and can be connected sequentially by inserting the front part of the succeeding pipe to the rear part of each pipe, and the anti-rotation protrusion provided on the front part of each pipe A synthetic steel pipe, in which each pipe is connected in a relatively non-rotatable manner by fitting into a fitting hole provided in the rear part, is disposed inside the synthetic steel pipe that is sequentially connected in order to construct instead of the steel pipe. As the support body, there are a support part for supporting the drawing steel rod and the feed / discharge mud pipe which are disposed through the synthetic steel pipe, and the support parts respectively below and inside the synthetic steel pipe. Each of the above to be held near the wall A connecting portion for connecting the lifting unit, it is preferable to those with a protection per unit of synthetic resin provided on the contact portion between the lower and the side of the inner wall of the said synthetic steel pipe.
[0018]
Unlike the steel pipe, the synthetic steel pipe has a concrete layer and has a small inner diameter. However, according to such a support body, the drawing steel rod and the feed / sludge mud pipe disposed in the synthetic steel pipe are disposed below and inside the pipe. Since it can hold | maintain in the side wall side vicinity of a side, the center part of the pipe cross section of the synthetic steel pipe under promotion can be made into a space | gap. This makes it possible to irradiate a guide beam, for example, from the starting vertical shaft toward the direction of excavation using the central portion of the pipe cross section that has become a gap, and receive the guide beam on the excavation tip conductor side to receive the guide of excavation. It is possible to easily and reliably determine and correct straightness in the body digging direction.
[0019]
Further, since the support body is provided with a protective contact portion made of a synthetic resin provided at a contact portion with the lower side wall and the side inner wall in the synthetic steel pipe, the inner wall of the synthetic steel pipe may be damaged. Can be prevented.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic diagram of an overall system configuration of a horizontal excavation machine according to an embodiment of the present invention.
[0021]
As shown in this figure, the system constituting the side hole excavator includes, as main components, a drilling tip conductor 10, 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 unit 51, a lubricant supply unit 52, an operation panel 53, a hydraulic unit 54, a generator 55 and the like 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 start shaft side while being sequentially connected with the synthetic steel pipes 30.
[0023]
FIG. 2 is a schematic perspective view showing the digging destination conductor 10 and the propulsion device 40 set in the starting shaft.
[0024]
As shown in this figure, the excavation tip conductor 10 includes a cutter head 11 provided at the head thereof, a crusher cone 12 for crushing earth and sand and rocks excavated by the cutter head 11, a cutter motor 13 for driving the cutter head 11, etc. A plurality of direction correcting jacks 14 for adjusting the direction of excavation, a target box 15 for receiving a guide beam for guiding the direction of excavation, a camera box 16 for photographing the target box 15, and mud for discharging earth and sand generated by excavation Tubes 18 and 18 are provided.
[0025]
The propulsion unit 40 transmits to the digging destination conductor 10 a propulsion frame 41 installed in the starting shaft, a pair of left and right propulsion jacks 42 and 42 that operate in the digging direction on the propulsion frame 41, and the propulsion jacks 42 and 42. Therefore, a pusher fitting 43 that pushes the rear surface of the excavation tip conductor 10 and the synthetic steel pipe 30, a guide beam irradiator 44 that irradiates a guide beam that guides the direction of excavation, and a reaction force that supports the propulsion frame 41 against the propulsion reaction force A plate 45 and a water stop pit 46 for preventing water leakage from the side hole to be excavated are provided. As will be described later, the pusher fitting 43 is provided with a protrusion that fits into a fitting hole 37 provided on the rear surface of the synthetic steel pipe 30 to prevent rotation of the propulsion unit 40 and the last synthetic steel pipe 30 during propulsion. It is illustrated.
[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 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 synthetic steel pipe 30 and the rear side of the excavation target conductor 10. In addition, when this excavation process is completed, this connecting pipe 20 is not carried out from the reaching vertical shaft and laid in the excavated side hole. Moreover, the pipe | tube 301 of the head of the synthetic steel pipe 30 employ | adopts a thing shorter than the subsequent pipe | tube 302 ... in order to ensure the workability | operativity at the beginning of excavation easily.
[0028]
The outer shape of the connecting pipe 20 is formed by a steel pipe main body 21.
[0029]
The front edge side of the tube main body 21 is formed thick in both the radial direction and the front-rear direction, and bolt holes (front connection portions) 211 for connecting to the rear surface of the digging tip conductor 10 are provided here. . The bolt holes 211 are provided at, for example, six locations at substantially equal intervals in the circumferential direction. 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 by bolting with bolt holes 211 on the connection pipe 20 side, the excavation destination conductor 10 and the connection pipe are connected. 20 are coupled in a state in which relative rotation is impossible and separation is impossible. As long as the connection between the connection pipe 20 and the digging tip conductor 10 is not relatively rotatable and cannot be separated, a connection form other than the bolt connection may be employed.
[0030]
An injection hole 212 for a lubricant or a chemical solution is provided in an upper portion of the tube body 21 at a substantially central portion in the front-rear direction.
[0031]
The outer diameter of the rear portion of the tube body 21 is slightly reduced, and a small-diameter portion 213 having two grooves in the circumferential direction is formed. A seal portion 22 made of an elastic body 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 outer side. The collar 23 constitutes a rear connection portion that is connected to the synthetic steel pipe 30 by a plug-in type by inserting a front portion of the synthetic steel pipe 30 inside thereof.
[0032]
An anti-rotation protrusion 36 of a synthetic steel pipe 30 (to be described later) is fitted to the upper rear surface of the pipe body 21, and a fitting hole 214 for connecting the connecting pipe 20 and the synthetic steel pipe 30 so as not to be relatively rotatable is provided. Yes.
[0033]
According to such a structure, since the connection pipe 20 is prevented from rotating relative to the digging conductor 10 and the synthetic steel pipe at the front side connection part and the rear side connection part, the side hole can be efficiently dug.
[0034]
In the vicinity of the rear part in the tube main body 21, steel bar attachment parts 24, 24 for fixing the front end parts of the drawing steel bars 72, 72 are provided on both the left and right sides. The pulling steel rods 72, 72 are plugged in so that the synthetic steel pipe 30 that is weak against tension can be pulled back to the start shaft when an unexpected situation occurs. It is a steel bar arranged inside.
[0035]
The steel rod mounting portions 24, 24 are formed with mounting holes 242 and 242 in ribs 241 and 241 provided so as to protrude inward from the left and right sides of the rear portion of the tube main body 21, respectively. Installed and configured.
[0036]
The front portions of the support metal fittings 243 and 243 pass through the attachment holes 242 and 242 and are male threaded, and are prevented from being detached by attaching two nuts 244. Further, female screws are cut at the rear portions of the support fittings 243 and 243, and the front end portions of the drawing steel bars 72 and 72 having the male screws cut therein are screwed and fixed. Further, the nuts 244 and 244 passed through the drawing steel bars 72 and 72 are tightened to the support fittings 243 and 243 so that the drawing steel bars 72 and 72 are securely attached to the support fittings 243 and 243 at the front ends thereof. It is supposed to be.
[0037]
Since the steel rod mounting portions 24 and 24 are provided in the connecting pipe 20 on the front side of the synthetic steel pipe 30, the pulling steel bars 72 and 72 are pulled from the start shaft side when an unexpected situation occurs. By pulling the connecting pipe 20 to the start shaft side, the synthetic steel pipes 30 sequentially connected thereby can be pulled back from the top side in the pulling-back direction and can be pulled back while applying a compressive force. In this pull-back operation, instead of the pusher fitting 43 described above, a puller fitting that can be attached with the rear ends of the pullback steel rods 72, 72 secured is attached to the propulsion unit 40, and the propulsive force of the propulsion jack 42 is increased. Is carried out by acting reversely.
[0038]
In the lower part of the pipe main body 21, in order to discharge the excavated earth and sand from the digging tip conductor 10 together with the water flow, the pipe 18, 18 on the digging tip conductor 10 side and the pipes 71, 71 on the synthetic steel pipe 30 side are connected. Mud communication pipes 25, 25 are provided. The pipe for discharging the excavated earth and sand is a water supply pipe that sends a water flow from the start shaft side to the excavation destination conductor 10 side, and a mud flow in which the excavation soil is mixed into the water flow from the excavation destination conductor 10 side to the start shaft side. It consists of two lines with the mud duct to return.
[0039]
The height positions of the pipe ports 181 and 181 of the pipe lines 18 and 18 on the digging destination conductor 10 side are located in the vicinity of the bottom of the digging destination conductor 10. This is because this excavation tip conductor 10 assumes a steel pipe sheath and a pipe system, and is adjusted to the inner bottom height position of the steel pipe used for the steel pipe sheath and the pipe system. In other words, it was a normal use that the steel pipe was placed on the inner bottom of the steel pipe, but the inner bottom height of the steel pipe was slightly higher than the outer lower surface of the pipe by about the thickness of the steel plate. Because it is only in.
[0040]
On the other hand, in the synthetic steel pipe 30 used in place of such a steel pipe, a concrete layer is formed inside the steel pipe outer shell, so that the inner bottom height is located above the steel pipe.
[0041]
The sending and discharging mud connecting pipes 25 and 25 provided in the connecting pipe 20 are connected to the sending and discharging mud pipe port 181 in the digging tip conductor 10 at the pipe connecting parts 252 and 252 at the front part thereof, and at the rear part thereof. It is connected to a supply / discharge mud pipe 71 disposed in the synthetic steel pipe 30. For this reason, intermediate portions in the front-rear direction of the feed / drain mud connecting pipes 25, 25 are bent so that the rear side (the synthetic steel pipe 30 side) is higher than the front side (the excavation tip conductor 10 side). Further, the rear portions of the feed / drain mud connecting pipes 25, 25 are supported from below by the pipe receiver 251 at the height position of the feed / drain mud pipe 71 in the synthetic steel pipe 30. By such sending and discharging mud connecting pipes 25 and 25, the earth and sand excavated by the excavation tip conductor 10 can be surely discharged to the start shaft side, and a smooth excavation work can be realized.
[0042]
The synthetic steel pipe 30 is configured by centrifugally forming a concrete portion 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. A seal portion 34 made of an elastic material such as rubber is wound around the insertion portion 33 around the insertion portion 33, and the subsequent tube insertion portion 33 is inserted into the insertion reception portion 35 of the preceding tube. In a state where both pipes are connected, a watertight state is maintained.
[0043]
An anti-rotation projection 36 that protrudes forward is provided on the front side of the insertion portion 33, and an anti-rotation projection on the rear surface side of the insertion receiving portion 35 at a position corresponding to the anti-rotation projection 36. A fitting hole 37 into which 36 can be inserted is formed. Thereby, when each synthetic steel pipe 30 inserts and connects the insertion part 33 of the succeeding pipe to the insertion receiving part 35 of the preceding pipe, the two pipes are prevented from rotating relative to each other. Yes.
[0044]
In the middle part in the front-rear direction of each synthetic steel pipe 30, two hanging portions 38, 38 for suspending the synthetic steel pipe 30 with a crane or the like when carrying the synthetic steel pipe 30 into the start shaft are formed inside the pipe. Has been.
[0045]
Such synthetic steel pipes 30 include those in which the inner surface of the concrete portion 32 is surface-coated (inner surface lining) with a synthetic resin or the like, or those in which concrete is exposed on the inner surface.
[0046]
Inside such a synthetic steel pipe 30, during the excavation of the side hole, the above-described feed / sludge mud pipes (slurry pipes) 71 and 71, the steel rods 72 and 72 for drawing, and the excavation conductor 10 are controlled from the start shaft side Power lines, control signal lines, hydraulic pipes, and the like are provided.
[0047]
Specifically, the synthetic steel pipe 30 is sequentially added to the rear of the last synthetic steel pipe 30 at the start shaft every time the excavation destination conductor 10 is excavated by a predetermined distance. , 71 are joined by pipe connectors 74, 74, and the steel bars 72, 72 for withdrawal are joined by couplers 73, 73.
[0048]
In addition, a guide beam for ensuring the straightness of the excavation irradiated from the guide beam irradiator 44 in the start shaft passes through the synthetic steel pipe 30 in a substantially central region of the pipe cross section. For this reason, in each synthetic steel pipe 30, arrangement | positioning of the above-mentioned feed / drain mud pipes 71 and 71 and the steel rods 72 and 72 for extraction is ensured so that the space | gap which lets a guide beam pass to the substantially center area | region of a pipe cross section can be ensured. A support body 60 that stabilizes and 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 out, and FIG. 8 is a pipe cross-sectional view inside 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 arc-shaped frame bodies 61 that extend from the inner bottom of the synthetic steel pipe 30 to both the left and right sides. At the center position in the left-right direction of the arc-shaped frame body 61, a feeding / discharging mud pipe holding fitting 62 is detachably attached by a thumbscrew 63. The arc-shaped frame body 61 and the feed / drainage mud pipe holding fitting 62 form a feed / drainage mud pipe support 64 that sandwiches and supports the feed / drainage mud pipes 71 from above and below. By this feed / drain mud pipe support portion 64, the feed / drain mud pipes 71, 71 are supported in the vicinity of the lower inner wall of the synthetic steel pipe 30.
[0051]
Further, steel rod support portions 65 and 65 for supporting the drawing steel rods 72 and 72 are provided at the left and right ends of the arcuate frame 61, respectively. The steel rods 72 and 72 for drawing are supported by the steel rod support portions 65 and 65 in the vicinity of the inner walls on the left and right sides of the synthetic steel pipe 30.
[0052]
As described above, the arcuate frame 61 functions as a connecting portion that connects the feed / discharge mud tube support portion 64 and the steel rod support portions 65 and 65 while being positioned at predetermined positions. Further, protective contact portions 66, 66 made of a soft material such as synthetic resin are provided at the lower side of the arcuate frame 61 and in contact with the inner wall surface of the synthetic steel pipe 30 obliquely below the left and right. It is attached 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 surface of the synthetic steel pipe 30 with the protective contact portions 66 and 66.
[0053]
According to such a support body 60, the feed / discharge mud pipes 71 and 71 and the drawing steel bars 72 and 72 in the synthetic steel pipe 30 are stably positioned near the inner wall of the pipe. In the synthetic steel pipe 30, other power lines, control signal lines, hydraulic pipes, and the like are disposed. However, since these are generally flexible, the supply and discharge mud pipes 71 and 71 and the steel bars 72 and 72 for extraction are provided. It can be easily positioned in the vicinity of the inner wall by wrapping around the inner wall. Thus, if each pipe etc. arrange | positioned in the synthetic steel pipe 30 is positioned in the inner wall vicinity, since it has the concrete part 32, an internal diameter is smaller than the steel pipe used for a steel pipe sheath and a pipe system, and the space in a pipe is sent and discharged. Although it is the synthetic steel pipe 30 which is easily occupied by a mud pipe or the like, the central region of the pipe can be secured as a gap.
[0054]
As a result, as shown in FIG. 8 where the guide beam passes through the virtual target 19, the guide beam is applied to the gap in the central portion of the tube that becomes the gap, and the digging conductor 10 advances straight in the digging direction. Sex discrimination / correction can be performed easily and reliably.
[0055]
According to the connection structure using the connection pipe 20 as described above, the difference between the pipe types of the steel pipe and the synthetic steel pipe is overcome while using the horizontal hole excavating machine assumed to perform the steel pipe sheath pipe method. Instead, it is possible to realize a high load-bearing force one-step propulsion method using a synthetic steel pipe, and by implementing a high load-bearing force one-step method using a synthetic steel pipe, the main pipe after propulsion like the steel pipe sheath and pipe method An insertion process, a filling process, and a welding operation for connecting a steel pipe are also unnecessary, 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 space is secured in the center portion to enable the use of a guide beam, and straight-forward excavation can be reliably realized. .
[0057]
As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited above, It cannot be overemphasized that it may change variously in the range which does not change the summary.
[0058]
【The invention's effect】
As described above, according to the connection structure of the drilled conductor and the synthetic steel pipe in the horizontal hole excavator according to the present invention, the pipe called the steel pipe and the synthetic steel pipe is used while using the horizontal hole excavator assumed to perform the steel pipe sheath and pipe method. Overcome the difference in seeds and realize 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.
[Brief description of the drawings]
FIG. 1 is an overall schematic diagram of a horizontal hole excavating machine according to an embodiment of the present invention.
FIG. 2 is a partially cutaway perspective view of a horizontal hole excavator body.
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 connecting 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]
DESCRIPTION OF SYMBOLS 10 Drilling destination conductor 18 Feeding / discharging mud pipe 181 Feeding / discharging mud pipe port 19 Target 20 Connection pipe 211 Bolt hole (front side connection part)
214 fitting hole 22 seal part 23 collar (rear side connection part)
Reference Signs List 24 Steel rod mounting part 25 Feeding / discharging mud 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 Anti-rotation protrusion 37 Fitting hole 40 Propulsion machine 41 Propulsion frame 42 Propulsion jack 43 Pusher bracket 44 Guide beam irradiator 60 Support body 61 Arc-shaped frame (connecting part)
62 Feeding / Draining Pipe Holding Bracket 63 Thumb Screw 64 Feeding / Draining Mud Pipe Support Part 65 Steel Rod Supporting Part 66 Protection Contact 71 Feeding / Draining Mud Pipe (Slurry Pipe)
72 Steel bar for drawing

Claims (1)

In the horizontal hole excavation machine where the steel pipe is sequentially welded and connected to the rear side of the drilling conductor that excavates earth and sand and rock in the ground, and this is pushed by a propulsion jack installed in the start shaft,
Concrete is centrifugally molded inside the outer shell of the steel pipe, and it can be connected in sequence by inserting the front part of the pipe that follows the rear part of each pipe, and the anti-rotation projection provided on the front part of each pipe is preceded by In order to replace the steel pipe with the synthetic steel pipe that is connected to the pipe so as not to be relatively rotatable by fitting into a fitting hole provided at the rear part of each pipe, the excavation tip conductor and the synthetic steel pipe A connection structure for connecting
A connecting pipe disposed between the drilled conductor and the synthetic steel pipe;
A front connection portion provided on the front surface side of the connection pipe and connected to the rear surface of the excavation tip conductor so as not to be relatively rotatable and disengageable;
A rear connection part provided on the rear surface side of the connection pipe and connected to the synthetic steel pipe by inserting a front part of the synthetic steel pipe;
The rotation preventing projections provided on the front part of the synthetic steel pipe provided on the rear surface side of the connection pipe and connected at the rear connection part are fitted, so that relative rotation with the synthetic steel pipe is impossible. A fitting hole to be connected;
An attachment portion for fixing a front end portion of a steel rod for drawing that is provided inside the connection pipe and sequentially reaches the start shaft through the inside of the synthetic steel pipes;
A start-up shaft provided inside the connecting pipe and penetrating through the synthetic steel pipe sequentially connected to the feeding and discharging mud pipe port on the rear surface of the digging tip conductor so as to discharge the excavated sediment from the digging tip conductor together with the water flow. A sending and discharging mud connecting pipe connecting the sending and discharging mud pipe to
A connection structure between a leading conductor and a synthetic steel pipe in a horizontal hole excavating machine characterized by comprising:

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