JP4445364B2 - Drilling rig - Google Patents

Description

In the present invention, when an underground structure serving as an underpass is buried and constructed under the track or under the road, the height of the upper floor portion of the underground structure is set in advance. The present invention relates to an excavation apparatus for embedding a steel pipe such as a pipe roof steel pipe that serves as a guide when the underground structure is buried at a corresponding position.

  Conventionally, when an underground structure serving as an underpass is buried by propulsion or the like, for example, in the ground under the track, first, as described in Patent Document 1, first, the underground structure under the track is buried across the track. After excavation of the start pit and the arrival mine on both sides of the planned area, a steel pipe with a rectangular cross-section with a rim cutting plate on the upper surface is installed on the upper floor of the underground structure in the ground between the start pit and the arrival pit. The pipe roof is formed by propelling and burying a plurality of pipes in parallel and forming a pipe roof.After that, the underground structure is installed in the start pit, and the front end surface of the upper floor is brought into contact with the rear end of the pipe roof. While excavating the front ground of the structure, propelling the underground structure and leaving the edge cutting plate in an immobile state, the pipe roof was pushed out along the lower surface of the edge cutting plate to the arrival tunnel side, and the underground structure Is buried in the buried design area.

In addition, as described above, a plurality of steel pipes having a rectangular cross-section with an edge cut plate disposed on the upper surface are propelled in parallel to the position of the upper floor of the underground structure in the ground between the starting mine and the reaching mine. After burying and forming the pipe roof, a member corresponding to the upper floor portion of the starting mine side, not the entire underground structure, is disposed, and the front end surface of the member is brought into contact with the rear end of the pipe roof. The pipe roof and this member are replaced by propelling the member, and then an underground passage is constructed by excavating the ground below the member (see Patent Document 2).
JP-A 64-29597 JP-A 63-75288

  In any of the above methods, in order to propel and embed a rectangular steel pipe for pipe roof formation in the buried design area, a screw auger with an auger head attached to the tip is inserted into the steel pipe, and this screw auger is inserted. It is propelled and buried while excavating the ground in front. At this time, a pair of upper and lower engaging protrusions are provided in advance on both side surfaces of the steel pipe over the entire length, and next to the upper and lower engaging protrusions protruding on one side surface of the previously embedded steel pipe. The steel pipe is propelled and buried in a predetermined direction while engaging the upper and lower engaging protrusions projecting on the other side surface of the steel pipe to be buried in the steel pipe. If there are obstacles such as wood chips, boulders, rock fragments, etc., not only the auger head may be damaged, but further propulsion and embedding may be difficult. After pulling out the screw auger every time, the worker is in the steel pipe in a flared state to investigate the cause and respond to the situation.

  For this reason, it is not only dangerous for workers to enter and exit a narrow steel pipe, but there is also a problem that the work loss time necessary for investigating the cause becomes long and the construction period becomes long. Moreover, there is a problem in that the steel pipe embedding work cannot be stably performed because the geology to be excavated, the excavation state, the excavation position of the auger head, and the like must be relied on by experience and intuition.

  The present invention has been made in view of such problems, and the object of the present invention is to smoothly and accurately place a steel pipe in a predetermined buried design position while always accurately confirming the face ground and excavation conditions in front of the steel pipe. An object of the present invention is to provide a drilling device that can be buried.

In order to achieve the above object, the excavation apparatus of the present invention is provided with excavation means for excavating the front ground in the steel pipe and in the front end portion of the steel pipe as described in claim 1. In an excavator equipped with a camera for observing excavation conditions and a cleaning liquid spray nozzle for cleaning the front surface of the camera, the steel pipe is formed in a rectangular cross section, and is formed on both side surfaces of the steel pipe. Engagement ridges are provided on the upper and lower portions in parallel with each other over the entire length, with an upper and lower engagement ridge on one side and an upper and lower ridge on the other side being connectable to each other. A protective tube that houses the cable connected to the camera along one of the upper and lower engaging ridges on one side and also supplies and removes the cleaning liquid from the rear end side to the front end portion of the steel pipe. Attach the front end of this protective tube Is introduced into the steel pipe from the front end of the tube to the front end of the protective tube in the cleaning solution spray nozzle, the withdrawn cable from the protective tube has a structure which is connected to the camera.

On the other hand, the invention according to claim 2 is provided with a drilling means for drilling the front ground in the steel pipe and a camera for observing the drilling situation in the front end portion of the steel pipe, and the front surface of the camera. In the excavator equipped with a cleaning liquid spray nozzle for cleaning the steel pipe, the steel pipe is formed in a rectangular cross section, and the engaging ridges are provided on the upper and lower portions on both sides of the steel pipe over the entire length, respectively. One of the vertical engagement ridges on one side and the vertical engagement ridges on one side and the vertical engagement ridges on the other side projecting in parallel with each other with a vertical space that can be connected to each other. A protective tube containing a cable connected to the camera and a hose for supplying a cleaning liquid is detachably attached from the rear end side to the front end portion of the steel pipe along the engaging protrusion of It is introduced into the steel pipe from the front end of the steel pipe to protect it. A cable drawn from the protective tube with a hose for supplying the withdrawn washing liquid from connecting to the cleaning solution spray nozzle, characterized in that connected to the camera.

Furthermore, in the invention according to claim 3 , a front tube is detachably connected to the front end of the steel tube, and a camera and a cleaning liquid injection nozzle are mounted in the opening of the front tube, The connecting cable and the protective pipe connected to the cleaning liquid spray nozzle are detachably connected at a connecting portion between the rear end of the front pipe and the front end of the steel pipe.

  According to the first aspect of the present invention, the excavating means is removably inserted into the steel pipe having a rectangular cross section, the front ground is excavated by the excavating means, and the camera is mounted in the front end opening of the steel pipe. While observing the state of excavation by the excavating means with this camera, the steel pipe can be propelled and buried in the ground, and while excavating and embedding the steel pipe, boulders, rock fragments, sleeper wood pieces, etc. If present, it can be confirmed immediately by the camera, and it is possible not only to prevent the cutting edge of the excavation means from being damaged, but also to cut the excavation means according to the presence of the cutting edge, that is, a piece of wood. The excavation means having a cutting edge, a gravel cutting edge, a clay cutting edge or the like can be used to smoothly continue the steel pipe embedding operation.

  In this way, the presence of foreign objects such as wood chips and boulders and other abnormalities during the excavation of steel pipes can be confirmed directly by the camera without confirmation by workers entering the steel pipe. , Not only can the safety of work be ensured, but also the measures against the occurrence of the abnormality can be performed quickly and accurately, the steel pipe can be propelled and buried efficiently, and the construction period can be shortened. .

In addition, since the cleaning liquid injection nozzle for cleaning the front of the camera is installed in the front end of the steel pipe, the camera lens that is soiled with the excavated soil can be cleaned and a clear image can be obtained. You can always clearly check the status of In addition, after the steel pipe is buried, the camera can be removed and the protective pipe can be removed, so that the steel pipe can be used again for the next construction.

In addition, the upper and lower portions on both sides of the steel pipe are provided with engaging protrusions over the entire length, and the upper and lower engaging protrusions on one side and the upper and lower engaging protrusions on the other side can be connected to each other. Since it is projecting in parallel, by engaging the vertical engagement ridge on the other side of the steel pipe to be embedded next to the vertical engagement ridge on the one side of the already embedded steel pipe, Of course, this steel pipe can be smoothly and accurately embedded along the already embedded steel pipe, and the engaging ridge is utilized by using an engaging ridge on one side which is not engaged when the steel pipe to be embedded is embedded. In addition, since the protective tube that houses the cable connected to the camera is removably attached, the protective tube can be easily and accurately attached to the steel tube, and the protective tube is protected by the engaging protrusion when embedded. I can keep it.

  Furthermore, on the front end side of the steel pipe, the front end of this protective pipe is introduced into the steel pipe from the outside of the front end of the steel pipe, so that the protective pipe can be easily connected to the injection nozzle without being interrupted by the drilling means. And can be easily connected to the camera by pulling out the cable disposed inside from the front end of the protective tube, and the steel tube can be smoothly prepared for embedment. The protective tube can be easily removed from the camera and the engaging ridge, and can be reused for the next steel pipe. Further, the cable can be pulled out integrally by pulling out the protective tube, and can be reused for burying the next steel pipe.

In addition, as described in claim 2 , the cable connected to the camera and the hose for supplying the cleaning liquid are stored in the protective tube, and the front end portion of the protective tube is introduced into the steel tube from the front end portion of the steel pipe. The hose that supplies the cleaning liquid drawn out from the protective tube may be connected to the cleaning liquid jet nozzle, and the cable drawn from the protective tube may be connected to the camera. Also in this case, by pulling out the protective tube, the hose and cable can also be pulled out integrally, and can be used again at the time of the next steel pipe embedment together with the camera and the injection nozzle.

According to the invention of claim 3 , the front pipe is detachably connected to the front end of the steel pipe, and the camera and the cleaning liquid injection nozzle are mounted in the opening of the front pipe. Since the cable connected to the camera and the protective tube connected to the cleaning liquid injection nozzle are detachably connected at the connecting portion between the rear end of the top tube and the front end of the steel tube, By removing the head pipe from the steel pipe, the camera and the cleaning liquid injection nozzle provided inside the head pipe can be separated from the steel pipe side integrally with the head pipe, and this front pipe is connected to the front end of the steel pipe to be buried next. The camera and the cleaning liquid spray nozzle can be reused as they are.

  A specific embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 4 and FIG. 5, it is ready-made in a direction crossing the track 20 on a lower ground 24 of a road or track (hereinafter referred to as track 20). When the underground structure 21 is buried, first, the start shaft 22 of the underground structure 21 is formed on one side of the track 20, and the reaching shaft 23 of the underground structure 21 is formed on the other side. If the track 20 is high and there is a wide space on both sides of the slope, it is not always necessary to excavate the shaft, so that one side is the start side and the other side is the arrival side. That's fine.

  Next, an edge cutting plate 2 made of a strip steel plate serving as a guide member for embedding the underground structure 21 is placed in the underground structure embedding design area of the ground 24 under the track 20 between the starting shaft 22 and the reaching shaft 23. By embedding a plurality of rectangular steel pipes 1 having a rectangular cross section, a pipe roof P having the same width as that of the underground structure 21 is formed.

  The present invention is characterized by the structure of a drilling device used when the steel pipe 1 for forming the pipe roof P is buried and constructed. This drilling device is shown in FIGS. 1 and 2. In addition, the front end of the steel pipe 1 having a fixed length at the front end has the same cross-sectional shape as the steel pipe 1 and the front end face of the opening is cut obliquely and formed in the blade edge 1b. A pipe 1a is detachably connected, and a screw auger 3 made of a screw conveyor having a cutting edge 3a made of an auger head detachably attached to the front end is removably inserted in the steel pipe 1 A camera 4 with an illuminator for confirming the excavation state of the front ground and a cleaning liquid injection nozzle 5 for cleaning the lens 4a of the camera 4 are mounted in the open end of the tube 1a.

  Further, the projecting projections 6a and 6b made of equilateral angle steel are parallel to each other and are fixed to the upper and lower portions of one side surface of the steel pipe 1 by welding or the like over the entire length thereof by welding or the like. Similarly, on the upper and lower portions of the other side surface of the steel pipe 1, there is an engagement ridge 7a made of an equilateral angled steel, with a vertical interval engageable with the engagement ridges 6a and 6b on one side of the upper and lower sides. , 7b are parallel to each other, and the horizontal end face is fixed by welding or the like over the entire length. In this case, the engaging protrusions 6a and 6b on one side face are fixed in a state in which the vertical parts refracted at right angles to the horizontal part face each other in the opposite direction. In the engaging protrusions 7a and 7b, the vertical portions that are refracted at right angles to the horizontal portions are fixed in directions opposite to each other, and adjacent steel pipes 1 are connected in parallel. In doing so, the upper and lower engaging protrusions 6a and 6b on one side of one steel pipe 1 are engaged with the upper and lower engaging protrusions 7a and 7b on the other side of the other steel pipe 1. .

  In the upper and lower engaging ridges 6a and 6b projecting parallel to each other on one side of the steel pipe 1, the inside of the upper engaging ridge 6a with the vertical portion facing downward, that is, one of the steel pipe 1 In order to supply the cleaning liquid to the cleaning liquid spray nozzle 5 in the groove 9 formed by the space portion having an inverted U-shaped cross section surrounded by the side surface and the horizontal portion and the vertical portion of the engaging protrusion 6a. The protective tube 8 is housed and disposed so that it can be pulled out and removed from the rear side of the steel tube 1 over the entire length of the steel tube 1, and an appropriate place of the protective tube 8 using a removable adhesive tape or the like if necessary. Is held in the groove 9. The protective tube 8 is made of a soft synthetic resin tube having flexibility such as soft vinyl chloride, and the cable 10 connected to the camera 4 is accommodated therein. The supply of the cleaning liquid is not performed through the protective tube 8, but a hose that supplies the cleaning liquid into the protective tube 8 may be inserted and supplied through the hose. In this case, the protective tube 8 houses the camera cable and the cleaning liquid supply hose and functions to protect them from abrasion caused by earth and sand.

  Further, the front end portion of the protective tube 8 protruding forward from the groove 9 is inserted into a short sheath tube 11 fixed to the upper portion of the rear end of one side surface of the leading tube 1a so as to be protected from contact with the ground. In addition, the front end of the opening of the sheath tube 11 faces the introduction hole 12 of the protection tube 8 provided at the upper portion of the rear end of one side surface of the leading tube 1a and the front end of the protection tube 8 drawn from the front end of the sheath tube 11 Is introduced into the leading tube 1a through the introduction hole 12, and the front end of the cable 10 led out from the protecting tube 8 through the tube wall of the protecting tube 8 in the leading tube 1a is connected to the camera 4. On the other hand, the protective tube 8 is connected to and communicated with the cleaning liquid spray nozzle 5. A soil discharge cover 13 is provided from the front end opening of the sheath tube 11 to the introduction hole 12, and the front end of the protective tube 8 is covered and protected by the soil discharge cover 13.

  Flange 14 protrudes toward the inner diameter direction on the inner peripheral surface of the opening portion of the top tube 1a of the steel tube 1 and the screw auger 3 is projected by the projecting end surfaces (inner end surfaces) of these lower flange portions 14. A circular hole 15 substantially equal to the front shape of the spiral blade is formed, and the blade edge 3a of the screw auger 3 faces the circular hole 15 toward the front. Further, as shown in FIG. 3, the camera 4 is directed toward the center of the opening end of the leading tube 1a on the flange 14 on the side of the engaging protrusion 6a where the protective tube 8 is disposed in the four-way flange 14. The cleaning liquid spray nozzle 5 is inserted in the flange 14 below the camera 4 in the same manner, and the spray nozzle is directed toward the front surface of the lens 4a made of a tempered glass plate of the camera 4. It is attached in a detachable state.

  The protective tube 8 is connected to the rear portion of the sheath tube 11 by an appropriate connecting fitting (not shown) so as to be separable from the rear end of the front protective tube 8 on the sheath tube 11 side by a tensile force. The cable 10 is also connected by an appropriate connection fitting (not shown) so as to be separable from the cable 10 on the sheath tube 11 side by a tensile force at that portion.

  When the steel pipe 1 to be buried has a long burying distance, the steel pipe 1 having a length obtained by dividing the burying distance into several parts is sequentially added in series. The length of the cable 10 accommodated in the protective tube 8 is also approximately equal to the length of the divided steel tube 1 and is inserted into and accommodated in the steel tube 1 so that it can be added by the same connection fitting as the connection fitting. Yes. In this case, an edge cutting plate 2 equal to the length of each steel pipe 1 is placed on the upper surface of each divided steel pipe 1, and the edge cutting plate 2 on the steel pipe 1 on the foremost end side connected to the leading pipe 1a is arranged. Only the front end portion is fixed to the upper surface of the leading pipe 1a or the upper surface of the front end of the steel pipe 1 by welding or bolts, while the edge cut plates 2 on the steel pipe 1 sequentially connected to the frontmost end side steel pipe 1 are mutually connected. It is configured to be integrally connected by welding.

  The front end of the steel pipe 1 on the foremost end side and the rear end of the leading pipe 1a are detachably connected to each other. The connecting structure includes a front end opening of the steel pipe 1 and a rear end opening of the leading pipe 1a. Are provided with joint box portions 16 and 17 formed of recesses at the four corners, and flange portions 16a and 17a projecting from the opening ends of the opposing joint box portions 16 and 17 are surface-joined, and the flange portions 16a and 17a are connected to each other. Are connected and fixed by bolts and nuts 18.

  In order to form a pipe roof P by embedding a plurality of steel pipes 1 constructed in this manner in parallel with the position of the upper floor portion of the underground structure 21 in the ground below the track 20, the front pipe 1a is attached to the front end. In addition, the steel pipe 1 on which the edge cutting plate 2 is placed on the upper surface is propelled and embedded in the lower ground of the track 20 from the start shaft 22 toward the arrival shaft 23. At this time, the screw auger 3 disposed in the steel pipe 1 is rotated to excavate the ground in front by the cutting edge 3a and the excavation state is observed by the camera 4 while the steel pipe 1 is laid from the start shaft 22 side. The end face is propelled using a propulsion jack. The earth and sand excavated by the screw auger 3 is carried out to the start shaft 22 side by the spiral blades of the screw auger 3 and removed.

  When the steel pipe 1 is dug and the front pipe 1a and the front end of the steel pipe 1 penetrate to the reaching shaft 23 side, the front end of the edge cutting plate 2 is separated from the front end of the steel pipe 1 and the front tube from the front end of the steel pipe 1 at the reaching shaft 23 side. The connection with the bolts and nuts 18 of 1a is released and the leading pipe 1a is separated from the steel pipe 1. At this time, the portion of the protective tube 8 drawn out from the rear of the sheath tube 11 fixed on one side surface of the leading tube 1a is separated by releasing the connection by the connecting metal fitting of the portion, and the cable 10 of the portion 10 Similarly, after disconnecting the connection, the head tube 1a is removed from the steel tube 1, and the camera 4 and the cleaning liquid spray nozzle 5 mounted in the head tube 1a are integrally removed from the head tube 1a. On the other hand, the protective tube 8 in the groove 9 separated from the front protective tube 8 and the cable 10 is removed by pulling back from the rear end side of the steel tube 1 protruding to the start shaft 22 side, and the next steel tube 1 is removed. Is inserted into the groove 9 of the steel pipe 1 and stored. Similarly, the screw auger 3 as excavation means is also pulled out from the steel pipe 1 toward the start shaft 22 and removed, and inserted into the steel pipe 1 when the next steel pipe 1 is buried.

  The top pipe 1a separated from the front end of the steel pipe 1 is transferred from the reaching shaft 23 side to the start shaft 22 side, and is connected again to the front end of the steel pipe 1 to be buried by a bolt / nut 18 and one of the top pipes 1a. The rear end of the front protective tube 8 drawn from the sheath tube 11 fixed to the upper rear end on the side surface and the rear end of the front cable 10 accommodated in the protective tube 8 are connected in the same manner as described above. Then, the steel pipe 1 is dug and buried from the start shaft 22 side toward the arrival shaft 23 in the same manner as described above. In addition, since the protective tube, the cable, and the hose are attached to the outside of the steel pipe 1, if the protective tube 8 has flexibility, it is not always necessary to have a structure that can be added. It may be longer than the distance.

  The steel pipe 1 to be buried is a vertical engagement protrusion projecting on the opposite side (other side) side of the vertical engagement protrusions 6a and 6b protruding on one side of the previously buried steel pipe 1. As described above along one side surface of the steel pipe 1 by using the upper and lower engaging protrusions 6a and 6b on the steel pipe 1 side which are engaged and embedded as described above along the one side surface of the steel pipe 1, the screw auger 3 makes the front ground. It is propelled and buried while drilling. At this time, one of the upper and lower engaging protrusions 6a and 6b protruding from one side of the steel pipe 1 to be buried, that is, the surface opposite to the other side to be engaged with the steel pipe 1 previously buried. The protective tube 8 is accommodated in the groove 9 formed by the upper engaging protrusion 6a as described above, and the cable 9 in the protective tube 8 is pulled out to the start shaft 23 side and is monitored (not shown). And confirm the situation of the ground in front of the top pipe 1a projected by the camera 4 on the start shaft 23 side with a monitor.

  Further, a water supply hose 25 provided with an open / close valve 19 is connected to the rear end of the protective pipe 8 drawn out to the start shaft 23 side, and this hose 25 is connected to a water supply pump (not shown) through the hose 25. Water as cleaning liquid is supplied to the protective tube 8 and sprayed from the cleaning liquid spray nozzle 5 onto the lens 4a of the camera 4 to clean the lens 4a so that the state of the face ground during excavation is clearly projected through the camera 4. .

  During the excavation and burial of the steel pipe 1, when the camera 4 confirms that there is a foreign object, for example, a piece of sleeper wood, in the front ground, the screw auger 3 is pulled out from the steel pipe 1 to the start shaft 22 side, and the cutting edge 3a is cut into the piece After exchanging with the cutting edge, it is inserted into the steel pipe 1 again, and the piece of wood is cut and removed by the cutting edge.

  In this way, a plurality of steel pipes 1 are sequentially embedded in the upper floor portion of the underground structure 21 in the ground below the track 20 so as to be parallel to the steel pipe 1 along the side surface of the previously buried steel pipe 1. Then, the pipe roof P is formed and the rear end of the edge cutting plate 2 placed on the upper surface of each steel pipe 1 is fixed to an appropriate fixed point on the start shaft 22 side so that all the edge cutting plates 2 are fixed. . In addition, the operation | work which cuts off the front end of the edge cutting plate 2 from the front-end part upper surface of each steel pipe 1 which protrudes in the reach | attainment shaft 23 side may be performed after formation of the pipe roof P by embedding all the steel pipes 1, or It may be performed during the formation of the pipe roof P.

  After the formation of the pipe roof P, as shown in FIG. 4 and FIG. As known in the art, on the start shaft 22 side, the above-mentioned underground structure 21 having a frame-shaped blade 26 for excavating the lower ground 24 of the pipe roof P is installed at the front end opening, and the upper floor portion thereof is installed. The front end surface of the upper floor 21a is pressed against the rear end surface of the pipe roof P so that the upper surface of 21a is in contact with the lower surface of the edge cutting plate 2 on the pipe roof P, and the rear end of the underground structure 21 and the start shaft 22 A plurality of propulsion jacks 27 are interposed between the rear wall surfaces.

  In this state, the piston rod of the propulsion jack 27 is extended, and the underground structure 21 is propelled and embedded in the ground below the track 20 while excavating the ground in front of the underground structure 21. When the underground structure 21 is propelled for a certain length, all the steel pipes 1 that form the pipe roof P are pushed out to the arrival shaft 23 side by the length corresponding to the length, so the length portion is cut and removed. To do. Further, each time the underground structure 21 is propelled for a certain length, the piston rod of the propulsion jack 27 is contracted, and a spacer member is interposed therebetween to extend the propulsion jack 27 again to propel the underground structure 21. .

  If the length of the underground passage to be built by the underground structure 21 under the track 20 is long, the underground structure 21 having a length obtained by dividing the length of the underground passage is divided and connected to the underground structure 21 in order. That's fine. Thus, the underground structure is constructed by burying the underground structure 21 penetrating from the start shaft 22 side to the reaching shaft 23 along the lower surface of the edge cutting plate 2 in the ground below the track 20. In the above embodiment, the front pipe 1a having the camera 4 and the cleaning liquid spray nozzle 5 mounted therein is detachably connected to the front end of the steel pipe 1. However, without adopting such a front pipe 1a, The camera 4 and the cleaning liquid spray nozzle 5 may be detachably mounted in the front end portion of the steel pipe 1.

The simplified side view which sectioned a part of steel pipe. The front view. The expanded sectional view of the part which attached the camera and the washing | cleaning liquid injection nozzle. A simplified longitudinal side view of an underground structure buried under a track. The simplified front view of a pipe roof.

P Pipe roof 1 Steel pipe
1a Lead pipe 2 Edge cutting plate 3 Screw auger 4 Camera 5 Cleaning liquid injection nozzle
6a, 6b, 7a, 7b Engaging protrusion 8 Protective tube
10 Cable
20 orbit
21 Underground structure
22 Starting shaft
23 Reaching shaft

Claims (3)

Excavation means for excavating the front ground is disposed in the steel pipe, and a camera for observing the excavation state in the front end portion of the steel pipe, and a cleaning liquid injection nozzle for cleaning the front surface of the camera In the excavating apparatus mounted, the steel pipe is formed in a rectangular shape in cross section, and the upper and lower portions on both side surfaces of the steel pipe are respectively provided with engaging protrusions over the entire length and on one side of the upper and lower engaging protrusions. The upper and lower engaging ridges on the other side face project parallel to each other with a vertical space that can be connected to each other, and the camera moves along one of the upper and lower engaging ridges on one side face. A protective tube for storing the cable to be connected and supplying the cleaning liquid is detachably attached from the rear end side to the front end portion of the steel pipe, and the front end portion of the protective tube is introduced into the steel pipe from the front end portion of the steel pipe. The front end of the protective tube is used as the cleaning liquid spray nozzle. A cable drawn from Mamorukan drilling apparatus characterized by being connected to the camera. Excavation means for excavating the front ground is disposed in the steel pipe, and a camera for observing the excavation state in the front end portion of the steel pipe, and a cleaning liquid injection nozzle for cleaning the front surface of the camera In the excavating apparatus mounted, the steel pipe is formed in a rectangular shape in cross section, and the upper and lower portions on both side surfaces of the steel pipe are respectively provided with engaging protrusions over the entire length and on one side of the upper and lower engaging protrusions. The upper and lower engaging ridges on the other side face project parallel to each other with a vertical interval that can be connected to each other, and the camera is moved along one engaging ridge in the upper and lower engaging ridge on one side face. A protective tube containing the cable to be connected and the hose supplying the cleaning liquid is detachably attached from the rear end side of the steel pipe to the front end portion, and the front end portion of this protective tube is introduced into the steel pipe from the front end portion of the steel pipe. Supply the cleaning liquid drawn from the protective tube. That rigs the cable drawn out from the protective tube, characterized in that connected to the camera with a hose connected to the cleaning liquid injection nozzle. A front pipe is detachably connected to the front end of the steel pipe, and a camera and a cleaning liquid injection nozzle are mounted in the opening of the front pipe, and further connected to a cable connected to the camera and the cleaning liquid injection nozzle. 2. The excavator according to claim 1, wherein the protective pipe is detachably connected at a connecting portion between the rear end of the front pipe and the front end of the steel pipe.

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