JP6546059B2 - Underground continuous wall drilling machine and underground continuous wall drilling method - Google Patents

Description

  The present invention relates to an underground continuous wall excavating machine and an underground continuous wall excavating method which are used by being suspended and supported by a jib of a base machine to excavate a digging groove (element) for constructing the underground continuous wall, In particular, by shortening the cycle time in the digging operation and simultaneously improving the digging pitch, it is possible to improve the working efficiency and efficiently cope with digging in a large depth area.

  The underground continuous wall is made in advance to a digging ditch of a predetermined depth called an element excavated by opening and closing the bucket having a pair of left and right shells while preventing the collapse of the ditch wall using a stabilizer. It is a continuous reinforced concrete wall built in the ground by inserting the rebar which has been stored and placing fresh concrete using a toremi pipe. Its applications are wide-ranging applications such as earthquake-resistant basement walls, basement body walls, foundations, circular shafts, underground tanks, earth retaining walls, dams, and so on.

  Underground continuous wall excavating machines are attached to kellybars mounted on jibs of base machines such as crawler cranes (Patent Document 1), and instead of kellybers, they are used by being suspended via wires on jibs (patent document 1) 2, 3). These underground continuous wall excavators excavate a digging groove of a predetermined depth by grasping the soil and discharging it to the ground by opening and closing the bucket with a hydraulic cylinder. In addition, a special underground continuous wall drilling machine is also provided for the purpose of excavating in close proximity to a retaining wall or an adjacent structure (Patent Document 3).

  The underground continuous wall excavating machine attached to the kelly bar shown in Patent Document 1 has a pair of shells attached to the lower end of the kelly bar so as to be able to open and close with respect to the excavating machine main body. The shell is individually opened and closed by a pair of hydraulic cylinders fixed to the rod end and the rod end portions fixed to the shell respectively. That is, a pair of hydraulic cylinders are arranged in parallel at the left and right outer ends of the pair of shells, the rod of the hydraulic cylinder is extended to close the shell and the rod is contracted to open the shell. (Refer FIG. 3 of patent document 1).

  Also in the underground continuous wall excavating machine suspended via a wire as shown in Patent Documents 2 and 3, a pair of shells attached to an excavating machine main body suspended to a wire so as to be openable and closable are provided at the head end The shell is individually opened and closed by a pair of hydraulic cylinders, each of which is fixed to the excavator body and the rod end is fixed to the shell. That is, a pair of hydraulic cylinders are arranged in parallel at the left and right outer ends of the pair of shells, the rod of the hydraulic cylinder is extended to close the shell and the rod is contracted to open the shell. (See FIG. 1 of Patent Document 2 and FIG. 3 of Patent Document 3).

  In addition, as shown in Patent Document 3, to excavate a base machine boom for supporting an underground continuous wall excavating machine in the width direction in order to excavate a location close to a retaining wall or an adjacent structure. Also provides a means of expanding the excavable area from the position of the base machine.

Unexamined-Japanese-Patent No. 5-255932 JP-A-8-284200 JP-A-7-3831

  The underground continuous wall can be constructed in advance from the ground, so it has been tried to develop applications in various fields, not just the conventional earth retaining wall and water blocking wall, and its importance is increasing. There is. In addition, by increasing the depth of underground structures, increasing necessary seismic strength, etc., the depth of 30 m to 60 m, which has been the main component, is increased to 100 m, more specifically 60 m. It is required to construct a deep underground continuous wall having a depth to reach, and even a depth of 100 m or less. At the same time, during drilling, the drilling accuracy is maintained, and the cycle time in the drilling operation is shortened, and the drilling pitch is improved, thereby increasing the number of drillings and the amount of soil excavated in a unit time to improve work efficiency. It is required to The demand for this work efficiency improvement becomes stronger as the depth of the ditch becomes deeper.

  The underground continuous wall drilling machine fixed to the keriber as shown in Patent Document 1 can fix the inclination of the bucket at the time of excavation by using the keriba, so the posture of the underground continuous wall drilling machine is stable Although there is an advantage that the drilling accuracy in the vertical direction can be maintained high, it is difficult to correct if the digging groove is bent due to an obstacle or the like in the ground. Above all, Keliva is heavy because it consists of multiple tubes, and there is a restriction in the usable length from the relation with the series winding capacity of the base machine, and it is not possible to dig beyond the length of Keliva, so The depth is limited to about 40m. As a result, it can not meet the recent demand for a large deep trench.

  On the other hand, the underground continuous wall drilling machine suspended via a wire to a jib of a base machine as shown in Patent Documents 2 and 3 is a wire delivery amount as long as it can be wound on a winch drum of the base machine. It is possible to drill a deep ditch because there is no restriction on the weight and the weight is also lighter than keriba. Therefore, in order to drill a deep trench, it is necessary to assume that the underground continuous wall excavator is suspended by a wire with no length restriction. On the other hand, when the underground continuous wall drilling machine is supported by a wire, the excavation ditch may be bent by the soil quality or obstacles of the ground to be excavated, so the posture of the underground continuous wall excavation machine is adjusted to the excavation ditch It is a new challenge to take measures to

  Since the bucket of the underground continuous wall drilling machine is opened and closed by hydraulic cylinders, it is necessary to supply hydraulic pressure and necessary power to the underground continuous wall drilling machine from a hydraulic unit equipped with a hydraulic pump, hydraulic tank and the like. In the past, underground continuous wall excavators were also provided in which the hydraulic unit was mounted on the excavator main body, but the capacity of the hydraulic tank etc. of the hydraulic unit that can be mounted on the underground continuous wall excavator was restricted. In the space, a sufficient external refrigerant necessary for heat exchange for cooling can not be secured, and various problems occur due to heat generation. That is, when the temperature of the hydraulic oil increases, the viscosity drops and component changes occur, often making it impossible to perform sufficient cooling at the time of excavation. Therefore, since it becomes necessary to stop drilling due to the rise in oil temperature, the drilling operation is stopped, which directly affects the working efficiency.

  Therefore, the hydraulic unit and the excavator main body are separated, the hydraulic unit is installed on the ground, and the hydraulic hose wound up on the reel of the base machine is ground continuous from the ground via the jib of the base machine. By extending the wall drilling machine to supply hydraulic pressure, it is possible to employ a sufficient capacity of hydraulic tank and various cooling means, and it is not necessary to stop excavation for cooling the hydraulic tank. On the other hand, the length of the provided hydraulic hose for reel winding is limited, and the maximum length is about 65 m at present. Therefore, in order to excavate a deep area having a depth of up to 100 m, or even a depth of 100 m or more, it is necessary to use a plurality of hydraulic hoses connected together. When the hydraulic hoses are connected, it is inevitable that the connection portion becomes a straight line of about 150 mm, and the smooth drawing and winding of the straight line portion through the jib becomes a new problem.

  In addition, it is expected that a sudden load will be applied to the hydraulic hose and the cabtire cable for supplying power due to the operation of the underground continuous wall drilling machine and the time lag of the feeding and winding operations. The deeper the ditch, the higher the risk and the higher the load. Therefore, it is required as a new problem to provide appropriate shock absorbing means that the hydraulic hoses, cabtire cables and the like are not damaged even by these loads.

  As shown in Patent Documents 1, 2 and 3, a pair of hydraulic cylinders for opening and closing the bucket of the underground continuous wall drilling machine are disposed in parallel at the left and right outer ends of the pair of shells. The rod is closing the shell by extension operation and the shell is opened by contraction operation of the rod. From the viewpoint of shortening working cycle time of drilling and simultaneously improving working pitch by improving working pitch, improvement of lifting speed of bucket to digging groove, improvement of opening and closing speed of bucket, sediment in bucket It is required to ensure that the Among these, the lifting and lowering speed of the bucket is mainly due to the capacity of the base machine, so in the underground continuous wall drilling machine bucket, it is necessary to both grab the soil which is the grasped object reliably and to increase the opening and closing speed. It is required to achieve.

  That is, in the case of bucket gripping work, large opening and closing force (gripping force) is required above all in the case of heavy load such as excavating soil, especially hard ground, while excavating soft soil or discharging the grabbed soil In the case where the load is small, a large opening / closing force (gripping force) is not required, and therefore the improvement of the opening / closing speed should be given priority. However, since the bucket of the conventional underground continuous wall drilling machine does not stand in this way, adjusting the opening and closing force (gripping force) and the opening and closing speed are not performed depending on the magnitude of the load applied to the bucket . The conventional underground continuous wall drilling machine performs opening and closing operation at a constant speed on the premise of necessary opening and closing force (gripping force) regardless of the magnitude of load applied to the bucket, and requires large opening and closing force (gripping force) The cycle time is prolonged due to the accumulation of bucket opening and closing times when the load is small. Therefore, in order to shorten the cycle time, it becomes a new subject to adjust the opening and closing force (gripping force) and the opening and closing speed by the hydraulic oil amount of the hydraulic cylinder depending on the magnitude of the load applied to the bucket.

  Furthermore, since the conventional underground continuous wall excavating machine individually opens and closes a pair of left and right shells constituting the bucket with independent hydraulic cylinders, the left and right shells are obstructed by rocks and rocks in the ground and the like. There is a risk that the opening and closing operations may not be performed smoothly. Further, since the pair of hydraulic cylinders are arranged in parallel at the outer end of the shell in the left and right direction, there is an inherent risk of being damaged by an obstacle or the like in the ground.

  In addition, excavation of the excavation ditch matches the direction of opening and closing of the bucket in the horizontal direction and the width direction of the excavation ditch by installing the base machine on which the underground continuous wall drilling machine is supported in the direction orthogonal to the excavation ditch. It is basic to make it excavate. However, at various drilling sites, when drilling near a retaining wall or adjacent structure, or due to the presence of an obstacle, the base machine can not be positioned so that it can be positioned relative to the digging groove (drilling position). Absent. Therefore, as shown in Patent Document 3, a means for moving the boom for supporting the underground continuous wall drilling machine of the base machine in the width direction of the base machine is also provided, but the adjustable range is narrow, In addition, it is necessary to attach the moving means in the lateral direction to the base machine, and also the moving time in the lateral direction is required.

  If the base machine can not be positioned relative to the digging groove, the bucket can be suspended horizontally above the digging groove as long as the bucket can be turned horizontally at the current position. The bucket can be easily positioned without being Therefore, in order to reduce the cycle time, it is a new challenge to accurately and easily control the attitude of the bucket in the horizontal direction.

  Therefore, the present invention solves the new problem that the above-mentioned conventional underground continuous wall drilling machine and underground continuous wall drilling method are required to solve, thereby maintaining the drilling accuracy, and the drilling cycle. It is an object of the present invention to provide an underground continuous wall excavation machine and an underground continuous wall excavation method which improve working efficiency even in a large depth area by shortening the time and simultaneously improving the digging pitch.

In order to achieve the object of the present invention, in a underground continuous wall excavator in which a bucket consisting of a pair of left and right shells is opened and closed to excavate a digging groove , a support is provided in a swing frame mounted above the bucket A hanging pivot is inserted, the rack gear is engaged with the pinion gear connected to the pivot, and the rod of the turning hydraulic cylinder mounted in the turning frame is connected to the rack gear, and telescopic operation of the rod of the turning hydraulic cylinder The pivoting frame is pivotally supported on the support by pivotally moving the rack gear by the rack gear, and the bucket is supported by hooking the support cable which is fed out and taken up from the jib of the base machine on the sheave mechanism mounted on the support. Underground suspended wall excavating machine that enables horizontal rotation of the bucket at the current position with Subjected to.

Then, by advancing and retracting the rack gear, the pivot shaft to which the pinion gear is connected is pivoted, and the pivot frame is pivoted with respect to the support, whereby the bucket is pivoted horizontally at the current position.

In addition, in a state where the pinion gear is engaged with the center of the rack gear by advancing and retracting the rack gear from the state where the pinion gear is engaged with the center of the rack gear to the state where the pinion gear engages with one end or the other end of the rack gear. Rotate the bucket 90 degrees.

Furthermore, by advancing and retracting the rack gear from the state in which the pinion gear meshes with one end of the rack gear to the state meshing with the other end, the bucket in a state in which the pinion gear meshes with one end of the rack gear is turned 180 degrees. did.

The underground continuous wall excavating machine of the above configuration is suspended via a support cord to a base machine, and a drilling groove of a predetermined depth for constructing the underground continuous wall is stabilized by opening and closing the bucket. In the underground continuous wall excavating method of excavating while filling the inside of the excavating ditch to prevent collapse of the excavating ditch wall, the position of the bucket with respect to the excavating ditch is adjusted by turning the bucket at an actual position, The digging groove is excavated by adjusting the position of the bucket relative to the digging groove without moving the base machine.

  According to the present invention described above, since the underground continuous wall excavating machine is suspended from the jib of the base machine by the support cord such as a wire, the support cord can be provided with a length that can be wound on the winch drum of the base machine. There is no restriction on the amount of feeding, so the depth is larger than 30m to 60m, which has been the main factor so far, specifically to a depth that reaches 100m beyond 60m, and further to a depth of 100m or less It is possible to drill a deep ditch such as having

  Since the first hydraulic cylinder and the second hydraulic cylinder that perform the opening and closing operations of the bucket are disposed on the center line of the bucket and provided at the center of the underground continuous wall excavator, they are damaged by obstacles and the like in the ground There is less risk. In addition, since the first hydraulic cylinder disposed in the upper stage and the second hydraulic cylinder disposed in the lower stage are disposed in series in the vertical direction with the rod side end portions facing each other, the first hydraulic cylinder extends, and 2 The hydraulic cylinder is contracted to close the bucket, and the first hydraulic cylinder is contracted, and the second hydraulic cylinder is expanded to open the bucket, so that the opening and closing operation of the bucket can be performed with the same thrust. Further, since the opening and closing operation of the shell is performed in conjunction with the left and right of both the first hydraulic cylinder and the second hydraulic cylinder, the opening and closing operations coincide with each other.

  Furthermore, the rod of the first hydraulic cylinder extends during the closing operation of the bucket, and the rod of the second hydraulic cylinder extends during the opening operation of the bucket. Therefore, the hydraulic pressure for extending the rod of the first hydraulic cylinder and the rod of the second hydraulic cylinder is supplied according to the digging condition, that is, according to the degree of the load applied to the bucket, It is possible to select the supply of hydraulic pressure by the differential circuit.

  That is, when the bucket is opened in a state where the load is small in the digging groove, or when the bucket is opened to discharge the stored soil, that is, when the opening / closing speed is prioritized without requiring a gripping force, the differential Select a circuit and open a bucket. Similarly, when excavating a soft ground with low excavation resistance, grasping earth with low excavation resistance, closing an open bucket without grasping earth and sand, etc., ie without requiring a grasping force, priority is given to opening / closing speed. If so, select the differential circuit and close the bucket.

The front view of the state which closed the bucket of the underground continuous wall drilling machine. The side view of FIG. The front view of the state which opened the bucket of FIG. The whole side view which hung the underground continuous wall excavation machine to the base machine. Principal part explanatory drawing which shows the attachment state of a hydraulic cylinder. The front view of the main body frame which accommodated the sliding box. AA expanded sectional view of FIG. The front view of a shell attachment frame. Front view of a connection frame. The principal part front view of the underground continuous wall drilling machine. Bucket operation explanatory drawing. Bucket operation explanatory drawing. Explanatory drawing of the normal circuit at the time of closing a bucket. Explanatory drawing of the differential circuit at the time of closing a bucket. Explanatory drawing of the normal circuit at the time of opening a bucket. Explanatory drawing of the differential circuit at the time of opening a bucket. Explanatory drawing of the turning mechanism of a bucket. Explanatory drawing of the turning mechanism of a bucket. Structure explanatory drawing of the jib tip of a base machine. Structure explanatory drawing of the jib tip of a base machine. Explanatory drawing of a buffer mechanism. Explanatory drawing of a buffer mechanism. An explanatory view of a posture amendment device. An explanatory view of a posture amendment device. The whole layout of the drilling site.

  EMBODIMENT OF THE INVENTION Below, based on drawing, embodiment of the underground continuous wall excavation machine which concerns on this invention, and the underground continuous wall excavation construction method is described. FIG. 1 is a front view of the underground continuous wall drilling machine 1 according to the present invention in a closed state of the bucket 10, FIG. 2 is a side view thereof, FIG. 3 is a front view of the open state of the bucket 10, and FIG. It is the whole side view hung on 2. The underground continuous wall excavating machine 1 is suspended by a support rope 4 such as a wire rope from a jib 3 erected on a self-propelled base machine 2 such as a crawler crane, and a bucket 10 consisting of a pair of left and right shells 11 and 12 Is a device which is opened and closed by two hydraulic cylinders consisting of a first hydraulic cylinder 20 and a second hydraulic cylinder 30 to excavate a digging groove.

  The left and right shells 11, 12 are rotatably supported at the lower end portion of the shell mounting frame 41 by the connection pin 15, and one end of the tie rods 13, 14 is rotatably connected to the upper surfaces of the shells 11, 12 The other end of the tie rods 13 and 14 is rotatably supported by a connecting pin 49 in a sliding box 50 slidably installed in the main body frame 40 to which the shell mounting frame 41 is fixed. It is Therefore, the bucket 10 comprising the pair of left and right shells 11 and 12 can be opened and closed with the connection pin 15 as the rotation center, and excavated and excavated earth and sand by the opening and closing operation or drained excavated earth and sand can be discharged. .

  FIG. 5 is an explanatory view of an essential part showing the mounting state of two hydraulic cylinders consisting of the first hydraulic cylinder 20 and the second hydraulic cylinder 30, FIG. 6 is a front view of the main body frame 40 housing the sliding box 50, FIG. 6 is an enlarged sectional view taken on line A-A of FIG. 6, FIG. 8 is a front view of a shell mounting frame 41, and FIG. 9 is a front view of a connecting frame 42 described later. Note that FIG. 5 is illustrated as a perspective view of the state in which the main body frame 40 is extracted for the purpose of explanation. The head side end 22 of the first hydraulic cylinder 20 is fixed to the connecting frame 42 fixed to the upper end of the main body frame 40 by the fixing pin 25, and the head side end 32 of the second hydraulic cylinder 30 is lower end of the main body frame 40 Fixed by the fixing pin 35 to the shell mounting frame 41 fixed at the same time, the rod side end 21 of the first hydraulic cylinder 20 and the rod side end 31 of the second hydraulic It fixes to the box 50 by the fixing pins 26 and 36. Therefore, the sliding box 50 slides in the vertical direction in the main body frame 40 by the expansion and contraction operation of the rod 23 of the first hydraulic cylinder 20 and the rod 33 of the second hydraulic cylinder 30.

  The main body frame 40 is a hollow rectangular tubular body having a rectangular cross-section and open at both upper and lower surfaces, and a window 40a extending substantially the entire sliding range of the sliding box 50 is formed on both front and back surfaces. The sliding box 50 is a rectangular parallelepiped block body, and the whole area of both outer side surfaces abuts on both inner side surfaces of the main body frame 40, and a part of the front and back outer surfaces abuts on both front and back inner surfaces of the main body frame 40 , And can slide vertically in the main body frame 40. The sliding surfaces of the main body frame 40 and the sliding box 50 can not avoid being worn out by the sliding operation. Therefore, the sliding plate 44 divided into two in the vertical direction is detachably mounted on the sliding surface of the main body frame 40, and the sliding plate 51 is detachably mounted on the sliding surface of the sliding box 50. They are replaced accordingly (see FIG. 7). In the illustrated example, as the material of the sliding plate 51 mounted on the sliding box 50, a material having a hardness lower than that of the sliding plate 44 mounted on the main body frame 40 is used to promote wear of the sliding plate 51. ing. Therefore, the sliding plate 51 with high wear rate is divided into a plurality of, in the illustrated example, eight parts so as to be partially replaceable (see FIG. 7).

  Pin holes 52 and 53 for fixing the rod side end 21 of the first hydraulic cylinder 20 and the rod side end 31 of the second hydraulic cylinder 30 are formed in the sliding box 50 so as to face each other in the vertical direction. It is done. Further, pin holes 54 and 55 for supporting the other ends of the tie rods 13 and 14 whose one ends are axially supported by the shells 11 and 12 are formed to face each other in the left-right direction. Therefore, the tie rods 13 and 14 are pivotally attached to the sliding box 50 and the shells 11 and 12 from the outside of the main body frame 40 through the windows 40 a.

  On the outer periphery of the upper and lower ends of the main body frame 40, a connecting flange 45a in which a plurality of reinforcing ribs 46a are erected is provided in a protruding manner. Similarly, a connecting flange 45b in which a plurality of reinforcing ribs 46b are erected is provided on the outer periphery of the upper and lower ends of the connecting frame 42 shown in FIG. 9, and the main body is connected via the flanges 45a and 45b. A connecting frame 42 is bolted and fixed to the top of the frame 40. The connecting frame 42 is a hollow rectangular cylindrical body having a rectangular cross section and an open lower surface, and is connected to the turning frame 60 via the upper flange 46 b. In FIG. 9, reference numeral 47 denotes a pin hole through which a fixing pin 25 for fixing the head end 22 of the first hydraulic cylinder 20 to the connecting frame 42 is inserted. It is a window formed on both front and back sides.

  A connecting flange 45c in which a plurality of reinforcing ribs 46c are erected is provided on the outer periphery of the upper end of the shell mounting frame 41 shown in FIG. 8, and the flange 45c and the flange formed at the lower end of the main body frame 40 The shell mounting frame 41 is bolted and fixed to the lower portion of the main body frame 40 via 45a. The shell mounting frame 41 is a hollow rectangular cylinder whose cross section is rectangular and whose lower surface is open, and 48 is a pin hole for fixing the head end 32 of the second hydraulic cylinder 30 to the shell mounting frame 41. The fixing pin 35 is inserted. Reference numeral 49 denotes a pair of left and right pin holes, through which a connection pin 15 for pivotally supporting the shells 11 and 12 to the shell mounting frame 41 is inserted, and 41 a is a window formed on the shell mounting frame 41.

  According to the first hydraulic cylinder 20, the second hydraulic cylinder 30, and the bucket 10 having the above-described configuration, the rod 23 of the first hydraulic cylinder 20 extends and the rod 33 of the second hydraulic cylinder 30 contracts to thereby reduce the bucket 10 When closed (see FIG. 11) and conversely, the rod 23 of the first hydraulic cylinder 20 shrinks and the rod 33 of the second hydraulic cylinder 30 extends to open the bucket 10 (see FIG. 12). As described above, in the underground continuous wall excavating machine 1 according to the present invention, the two hydraulic cylinders consisting of the first hydraulic cylinder 20 and the second hydraulic cylinder 30 face each other with the rod side end portions 21 and 31 facing each other. The sliding box 50 is slid in the main body frame 40 by arranging in series in the direction so that the extension and contraction operations of the rod 23 of the first hydraulic cylinder 20 and the rod 33 of the second hydraulic cylinder 30 mutually operate in opposite directions. It is one of the features to make the bucket 10 open and close.

  In the underground continuous wall drilling machine 1 according to the present invention, the rod 23 of the first hydraulic cylinder 20 extends when the bucket 10 is closed, and the rod 33 of the second hydraulic cylinder 30 extends when the bucket 10 is opened. . Therefore, the hydraulic pressure for extending the rod 23 of the first hydraulic cylinder 20 and the rod 33 of the second hydraulic cylinder 30 may be a normal circuit according to the excavating situation, that is, according to the degree of load applied to the bucket 10. It is possible to select between the supply of hydraulic pressure by and the supply of hydraulic pressure by differential circuit.

  The differential circuit sends the fluid to both ends of the actuator, and the fluid on the rod side loses due to the difference in area of the cylinder, and the fluid pushed out is then added to the hydraulic pump flow rate and flows to the head side. It is. However, since the same pressure is generated on the rod side, the thrust at this time is limited to the same thrust as the cylinder rod diameter. Therefore, it is an effective hydraulic circuit when the speed of the rod is required rather than the thrust.

  In order to improve the digging efficiency, the bucket 10 is required to achieve both the grasping of the soil as the grasped object and the acceleration of the opening and closing speed. That is, when the load applied to the bucket 10 is large, it is required to maintain the necessary opening and closing force, while when the load is small, it is required to increase the opening and closing speed. In the present invention, since either the rod 23 of the first hydraulic cylinder 20 or the rod 33 of the second hydraulic cylinder 30 performs extension operation in both opening and closing operations of the bucket 10, the difference in both opening and closing operations of the bucket 10 It is possible to incorporate a circuit.

  FIG. 13 is an explanatory view when the bucket 10 is closed by a normal circuit giving priority to the opening / closing force, and the hydraulic pressure is applied by the hydraulic pump 56 to the head side of the cylinder 24 of the first hydraulic cylinder 20 and the cylinder 34 of the second hydraulic cylinder 30. The pressure is supplied to the rod side to extend the rod 23 of the first hydraulic cylinder 20 and reduce the rod 33 of the second hydraulic cylinder 30. The hydraulic pressure discharged from the rod side of the first hydraulic cylinder 20 and the head side of the second hydraulic cylinder 30 is returned to the tank 57 by the extension of the rod 23 and the reduction of the rod 33.

  Since the thrust due to the supply of the hydraulic pressure is supplied only in the direction closing the bucket 10 (the head side of the first hydraulic cylinder 20 and the rod side of the second hydraulic cylinder 30), the bucket 10 has a force according to the supplied oil pressure. Closed with Therefore, when the load applied to the bucket 10 is large, such as when excavating soil or gripping the excavated soil, that is, when the gripping force has priority over the opening / closing speed, the bucket 10 is closed by the above-described normal circuit.

  FIG. 14 is an explanatory view when closing the bucket 10 by the differential circuit giving priority to the opening / closing speed, by supplying the hydraulic pressure to both the head side and the rod side of the cylinder 24 of the first hydraulic cylinder 20 by the hydraulic pump 56. The oil pressure on the rod side is pushed out by losing the oil pressure on the head side due to the area difference of the cylinder 24 and supplied to the head side, so the rod 23 is the oil pressure obtained by adding the oil pressure supplied to the rod side to the oil pressure supplied to the head side. The extension speed is faster because the The hydraulic pressure of the second hydraulic cylinder 30 is reduced by the extension of the rod 23 of the first hydraulic cylinder 20, so that the hydraulic pressure drained from the head side is returned to the tank 57 and supplied to the rod side.

  Since the same pressure is generated on the rod side of the first hydraulic cylinder 20, the thrust of the rod 23 due to the supply of the hydraulic pressure is limited to the same thrust as the diameter of the rod 23. Therefore, when drilling a soft ground with little resistance to digging, grasping earth and sand with little excavation resistance, closing the open bucket 10 without grasping earth and sand, etc., that is, no grasping force is required, and the opening / closing speed is prioritized. In this case, the bucket 10 is closed by the above-described differential circuit.

  FIG. 15 is an explanatory view when the bucket 10 is opened by the normal circuit giving priority to the opening and closing force, and the hydraulic pressure is applied to the head side of the cylinder 34 of the second hydraulic cylinder 30 by the hydraulic pump 56 and the cylinder 24 of the first hydraulic cylinder 20. The pressure is supplied to the rod side to extend the rod 33 of the second hydraulic cylinder 30 and reduce the rod 23 of the first hydraulic cylinder 20. The hydraulic pressure discharged from the rod side of the second hydraulic cylinder 30 and the head side of the first hydraulic cylinder 20 is returned to the tank 57 by the extension of the rod 33 and the reduction of the rod 23.

  Since the thrust due to the supply of the hydraulic pressure is supplied only in the direction to open the bucket 10 (the head side of the second hydraulic cylinder 30 and the rod side of the first hydraulic cylinder 20), the bucket 10 has a force according to the supplied oil pressure. Opened by Therefore, when a large load is applied when the bucket 10 is opened, for example, when the bucket 10 is opened in a state where the load is large or the stored soil is large in the digging groove, that is, when the gripping force is prioritized over the opening / closing speed The bucket 10 is opened by the above-described normal circuit.

  FIG. 16 is an explanatory view when the bucket 10 is opened by the differential circuit giving priority to the opening / closing speed, by supplying the hydraulic pressure to both the head side and the rod side of the cylinder 34 of the second hydraulic cylinder 30 by the hydraulic pump 56. The oil pressure on the rod side is pushed out by losing the oil pressure on the head side due to the area difference of the cylinder 34 and supplied to the head side, so the rod 33 is the oil pressure obtained by adding the oil pressure supplied to the rod side to the oil pressure supplied to the head side. The extension speed is faster because the The hydraulic pressure of the first hydraulic cylinder 20 is reduced by the extension of the rod 33 of the second hydraulic cylinder 30, so that the hydraulic pressure drained from the head side is returned to the tank 57 and supplied to the rod side.

  Since the same pressure is generated on the rod side of the second hydraulic cylinder 30, the thrust of the rod 33 due to the supply of the hydraulic pressure is limited to the same thrust as the diameter of the rod 33. Therefore, when the load at the time of opening the bucket 10 in a state where the load is small in the excavation ditch is small or when the bucket 10 is opened to discharge the stored soil is small, ie, no gripping force is required, priority is given to the opening / closing speed. In this case, the bucket 10 is opened by the above-described differential circuit.

  As an example, the opening and closing speed of the bucket 10 shown in FIGS. 14 and 16 when the opening and closing speed of the shells 11 and 12 takes 42 seconds in the normal circuit giving priority to the opening and closing force of the bucket 10 shown in FIGS. The speed of opening and closing the shells 11, 12 was reduced to 6 seconds. Thus, when the load applied to the bucket 10 is small, it is one of the features of the present invention to adopt a differential circuit in both opening and closing of the bucket 10 to increase the opening and closing speed. Specifically, by adopting a differential circuit, the bucket 10 can be opened quickly at the time of discharging excavated soil to shorten the cycle time of the earth unloading time, and when the load is small, the bucket 10 can be quickly closed to Cycle time can be shortened. The switching between the normal circuit and the differential circuit is performed based on the pressure set in accordance with the digging site for the pressure sensor incorporated in the hydraulic manifold of the hydraulic circuit.

  The bucket 10 is horizontally pivotable at the current position in a state of being suspended from the jib 3 of the base machine 2 via the support cords 4. That is, the connecting frame 42 of the underground continuous wall drilling machine 1 is fixed to the turning frame 60, and the turning frame 60 is pivotally supported by the support 70. This turning mechanism will be described based on the explanatory view of the turning mechanism of the bucket 10 shown in FIGS. 17 and 18. The support 70 is provided with a sheave mechanism 77, and the underground continuous wall excavating machine 1 is supported by hanging the support cord 4 drawn from the jib 3 around the sheave mechanism 77. In FIG. 17 and FIG. 18, the components other than the components that are the main parts of the turning mechanism are omitted.

  The pivot shaft 71 is fixed to the lower surface of the support 70 by a bolt 73 via a pivot shaft mounting flange 72 projecting around the periphery thereof, and is suspended from the support 70 and inserted into the pivot frame 60. A pivot shaft casing 65 is accommodated in the pivot frame 60 and fixed to the pivot frame 60 by a bolt 67 to the pivot shaft casing mounting flange 66. The pivot shaft 71 inserted into the pivot frame 60 is pivotably accommodated in the pivot shaft casing mounting flange 66 via a plurality of bearings 68 in the vicinity of the upper and lower end portions.

  The tip end of the pivot shaft 71 protrudes from the pivot shaft casing 65 and connects the pinion gear 61. The rack gear 62 meshes with the pinion gear 61, and the rod 64 of the turning hydraulic cylinder 63 is connected to the end of the rack gear 62. In the illustrated example, a round rack gear is used as the rack gear 62. Therefore, the rack gear 62 can be advanced and retracted in the direction of the arrow Y by the extension operation of the rod 64 of the turning hydraulic cylinder 63 to rotate the pinion gear 61. Therefore, by moving the rack gear 62 forward and backward, the pivot shaft 71 to which the pinion gear 61 is connected can be pivoted, and the pivot frame 60 can be pivoted relative to the support 70.

  Specifically, from the state in which the pinion gear 61 is in mesh with the center of the rack gear 62, the rack gear 62 is in a state in which the pinion gear 61 is in mesh with one end of the rack gear 62 or in a state of meshing with the other end shown in FIG. By advancing and retracting, the bucket 10 is rotated 90 degrees in each direction, that is, from the state where the pinion gear 61 is engaged with one end of the rack gear 62 to the state where the other end is engaged (see FIG. 17). The bucket 10 can be rotated 180 degrees by advancing and retracting the

  With the pivoting mechanism of the bucket 10, as long as the bucket 10 can be suspended and supported above the digging groove, the bucket can be easily positioned without being limited to the position of the base machine 2.

  FIG. 25 is an overall layout view of the drilling site, and shows a state in which a digging trench is excavated in the excavation area 5 using underground continuous wall excavators 1a, 1b and 1c. The base machine 2a installs the jib 3a in a direction orthogonal to the excavation area 5, and excavates with the opening and closing direction of the bucket 10a of the underground continuous wall drilling machine 1a and the width direction of the excavation area 5 coincident with each other. . This position is the basic attitude of the drilling operation. However, in the operation of excavating the corner portion of the excavated area 5 as in the base machine 2b, the jib 3b can not be positioned in the basic posture. Similarly, even in the base machine 2c, the jib 3c can not be positioned in the basic posture due to the presence of the base machine 2d (obstacle). Therefore, as for the buckets 10b and 10c of the underground continuous wall excavating machines 1b and 1c suspended and supported by the jibs 3b and 3c, the open / close direction does not coincide with the width direction of the excavation area 5 as it is.

  Therefore, by rotating the buckets 10b and 10c of the underground continuous wall excavating machines 1b and 1c suspended on the jibs 3b and 3c by the above-described turning mechanism horizontally at the current position, as shown in the figure, the bucket 10b, By matching the open / close direction 10c with the width direction of the excavated area 5, excavation can be performed as in the case where the jibs 3b, 3c are positioned in the basic posture.

  In the present invention, the hydraulic unit for supplying the hydraulic pressure which is the drive source to the first hydraulic cylinder 20 and the second hydraulic cylinder 30 is separated from the underground continuous wall drilling machine 1 and installed on the ground. From the reels 6a, 6b and 6c of the base machine 2, respectively, a plurality of tubes 7 consisting of a cabtire cable 7b and a communication cable 7c for supplying the necessary power, such as a solenoid valve power source and a tilt power source. Is extended freely to the underground continuous wall excavating machine 1 in the digging groove from the ground via the jib 3 and supplied with oil pressure and power supply and controlled. ing.

  In the present invention, the depth which exceeds the depth of about 30m to 60m, which has been the main part of the present invention, is such a depth that the depth reaches 100m, specifically more than 60m, further 100m or less. As it is also intended to dig deep grooves, it is necessary to connect and use multiple hydraulic hoses 7a under the present condition where the maximum length of the supplied hydraulic hose 7a is about 65m, and this connection part is 150 mm It is inevitable that it will be a straight line of degree. In addition, the pipe 7 such as the hydraulic hose 7a, the cabtire cable 7b, the communication cable 7c, etc. is subjected to a rapid load due to the operation of the underground continuous wall excavating machine 1 or the time lag of the drawing out and winding operation of the pipe 7. It is expected that it will take, and the deeper the ditch, the higher the risk and the greater the load.

  Therefore, in the present invention, the pipe 7 such as the hydraulic hose 7a or the like having a linear connection portion is rapidly loaded on the pipe 7 together with the guide mechanism 80 for smoothly drawing out and winding up via the jib 3. A shock absorber 90 for absorbing and relieving the load on the pipe 7 by the jib 3 so that the pipe 7 such as the hydraulic hose 7a, cabtire cable 7b and communication cable 7c is not damaged even if it Equipped.

  19 and 20 are structural explanatory views of the tip of the jib 3 in the base machine 2. A tip frame 81 is attached to the tip of the jib 3, and the underground continuous wall excavating machine 1 is suspended on the tip frame 81. A distal end sheave 82 for supporting a support cable 4 such as a supporting wire is rotatably supported, and the support cable 4 is drawn out and wound up via the distal end sheave 82. Reference numeral 83 denotes an auxiliary sheave similarly pivotally supported by the distal end frame 81.

  At the open end of the tip frame 81, a guide frame 84, which is curved in an arc shape, is provided as a guide mechanism 80 for supporting the tube 7 such as the hydraulic hose 7a etc. and feeding out and winding it smoothly. A plurality of rotatably mounted guide rollers 85 are provided. In the illustrated example, the curvature of the guide frame 84 is R = 1000, and the plurality of guide rollers 85 are closely disposed around the entire area of the guide frame 84 so as to be rotatable. Since the curvature of the linear connection portion of the hydraulic hose 7a is about R = 350, the pipe body 7 such as the hydraulic hose 7a is supported in a gentle arc shape by the guide mechanism 80 of the above-described configuration and the underground continuous wall excavating machine Stretches smoothly to 1 including the connection for connection.

  The guide frame 84 is fixed by a fixed shaft 87 to a base frame 86 one end of which extends laterally from the end frame 81 of the jib 3 by a fixed shaft 87, and the other end is opened without being fixed to another member. ing. Furthermore, the guide mechanism 80 is equipped with a shock absorber 90 consisting of a buffer hydraulic cylinder 91 for absorbing and relieving the load on the tube body 7 and an accumulator 92 for storing the hydraulic pressure from the buffer hydraulic cylinder 91. It is That is, the rod side end of the buffer hydraulic cylinder 91 is fixed to the center of the lower surface of the arc-shaped guide frame 84, the head side end is fixed to the base frame 86, and the accumulator 92 is fixed to the base frame 86. There is. The accumulator 92 is divided into two chambers by a prada 94 which is a rubber diaphragm, and is connected to the buffer hydraulic cylinder 91 at one side to store the hydraulic pressure from the buffer hydraulic cylinder 91, Is filled with high pressure gas.

  Normally, as shown in FIG. 19, the hydraulic pressure of the accumulator 92 and the high pressure gas are in balance and the rod 93 of the buffer hydraulic cylinder 91 is in an extended state, as shown in FIG. When a load greater than a certain level is generated on the tube body 7 by an impact due to the operation of the underground continuous wall drilling machine 1, as shown in FIG. 21, the rod 93 is reduced by the load and the hydraulic pressure in the buffer hydraulic cylinder 91 is accumulated. The high pressure gas contracts and absorbs the oil pressure to relieve the load.

  Then, when the load disappears, as shown in FIG. 22, the hydraulic pressure in the accumulator 92 is discharged to the buffer hydraulic cylinder 91 by the expansion of the high pressure gas, and the rod 93 of the buffer hydraulic cylinder 91 is extended to become a normal body. Wake up.

  In the present invention, since the underground continuous wall drilling machine 1 is suspended from the jib 3 via the support cords 4, the digging groove is bent during the drilling operation due to the difference in the soil component of the ground in the drilling direction or an obstacle There is an inherent danger. Therefore, it may be necessary to have a means for correcting the posture of the underground continuous wall drilling machine 1 in accordance with the digging groove so as to be able to dig in the vertical direction while preventing bending of the digging groove. Therefore, in the underground continuous wall excavating machine 1, the connecting frame 42 and the main body frame 40 are equipped with the posture correction device 100 shown in FIG.

  As shown in FIGS. 23 and 24, this posture correction apparatus 100 fixes the head end of the posture correction hydraulic cylinder 102 in the posture correction box 101 formed of a rectangular block, and corrects the posture of the rod 103. It can extend and contract from the box 101 to the outside. The rod 103 pivotally mounts a rectangular posture correction plate 104 having a predetermined area on a rotation shaft 105. Further, a pair of free rods 106 axially supported in an expandable manner in the posture correction box 101 is fixed to the posture correction plate 104 with the rod 103 interposed therebetween.

  Therefore, by operating the posture correction hydraulic cylinder 102 to extend the rod 103, as shown in FIG. 24, the posture correction plate 104 and the free rod 106 are extended. Further, the posture correction plate 104 can rotate around the rotation shaft 105. Therefore, when it is necessary to correct the posture of the underground continuous wall excavating machine 1, the ground in the digging groove is expanded by expanding and contracting the posture correcting plate 104 at a necessary place in the digging groove. The position of the mid-continuous wall excavator 1 can be corrected and held at the optimum position. In the illustrated example, the posture correction device 100 is installed on both side surfaces of the upper end portion of the connection frame 42 and the lower end portion of the main body frame 40 (opening and closing directions of the bucket 10). The posture correction device 100 is also mounted on the connecting frame 42 and the main body frame 40 in the direction orthogonal to the above. Furthermore, the installation place of the posture correction box 101 may be any place.

  A method for excavating a ditch for constructing an underground continuous wall using the underground continuous wall drilling machine 1 is as follows. The underground continuous wall excavating machine 1 is suspended and supported by the base machine 2 via a support cord 4 made of a wire, and opening and closing operations of the bucket 10 consisting of a pair of left and right shells 11, 12 are performed by the first hydraulic cylinder 20 and the second hydraulic pressure. By alternately expanding and contracting the cylinders 30, a large depth such as having a predetermined depth for constructing a continuous underground wall, for example, a depth of more than 60 m and a depth of 100 m or even a depth of 100 m or less The ditch is drilled while filling the ditch with stabilizer to prevent collapse of the ditch wall. Then, due to the load applied to the bucket 10, when the load is low, the extension operation of the rod 23 of the first hydraulic cylinder 20 and the rod 33 of the second hydraulic cylinder 30 is performed using a differential circuit by giving priority to the opening / closing speed. On the other hand, when the load is high, the bucket 10 is opened and closed using the normal circuit with priority given to the opening and closing force. That is, the digging groove is excavated by controlling the opening / closing force and the opening / closing speed of the bucket 10.

  Then, the swing hydraulic cylinder 63 is driven to slide the rack gear 62 and the pinion gear 61 is rotated, thereby pivoting the pivot shaft 71 to pivot the bucket 10 relative to the support 70. Thereby, the position of the bucket 10 with respect to the digging groove is adjusted without moving the base machine 2 with respect to the digging groove.

  At the time of excavation, the hydraulic hose 7a supported by the guide mechanism 80 is connected from the hydraulic unit installed on the ground to the underground continuous wall excavating machine 1 to supply the hydraulic pressure to perform the opening and closing operation of the bucket 10 The cabtire cable 7b supported by the guide mechanism is connected to the underground continuous wall excavating machine 1 from the power supply unit installed in.

  According to the present invention described above, since the underground continuous wall excavating machine is suspended from the jib of the base machine by the support cord such as a wire, the support cord can be provided with a length that can be wound on the winch drum of the base machine. There is no restriction on the amount of feeding, so the depth is larger than 30m to 60m, which has been the main factor so far, specifically to a depth that reaches 100m beyond 60m, and further to a depth of 100m or less It is possible to drill a deep ditch such as having

  Since the first hydraulic cylinder and the second hydraulic cylinder that perform the opening and closing operations of the bucket are disposed on the center line of the bucket and provided at the center of the underground continuous wall excavator, they are damaged by obstacles and the like in the ground There is less risk. In addition, since the first hydraulic cylinder disposed in the upper stage and the second hydraulic cylinder disposed in the lower stage are disposed in series in the vertical direction with the rod side end portions facing each other, the first hydraulic cylinder extends, and 2 The hydraulic cylinder is contracted to close the bucket, and the first hydraulic cylinder is contracted, and the second hydraulic cylinder is expanded to open the bucket, so that the opening and closing operation of the bucket can be performed with the same thrust. Further, since the opening and closing operation of the shell is performed in conjunction with the left and right of both the first hydraulic cylinder and the second hydraulic cylinder, the opening and closing operations coincide with each other.

  Furthermore, the rod of the first hydraulic cylinder extends during the closing operation of the bucket, and the rod of the second hydraulic cylinder extends during the opening operation of the bucket. Therefore, the hydraulic pressure for extending the rod of the first hydraulic cylinder and the rod of the second hydraulic cylinder is supplied according to the digging condition, that is, according to the degree of the load applied to the bucket, It is possible to select the supply of hydraulic pressure by the differential circuit. That is, when the bucket is opened in a state where the load is small in the digging groove, or when the bucket is opened to discharge the stored soil, that is, when the opening / closing speed is prioritized without requiring a gripping force, the differential Select a circuit and open a bucket. Similarly, when excavating a soft ground with low excavation resistance, grasping earth with low excavation resistance, closing an open bucket without grasping earth and sand, etc., ie without requiring a grasping force, priority is given to opening / closing speed. If so, select the differential circuit and close the bucket.

  In addition, since the bucket is configured to be horizontally pivotable at the current position by pivotally supporting the pivot frame equipped with the bucket on the support, the base machine can not be positioned relative to the digging groove. As long as the bucket can be suspended above the digging groove by horizontally rotating the bucket in the current position, the bucket can be easily positioned without being limited to the position of the base machine. . With this configuration, the pinion gear is connected to the pivot shaft, the rack gear is engaged with the pinion gear, and the rack gear is advanced and retracted by the hydraulic cylinder for turning, so that it can be pivoted to the stepless and accurate position. .

  In a jib of a base machine in which the underground continuous wall drilling machine is suspended and supported by a support cord, a guide mechanism for supporting a hydraulic hose connected to the underground continuous wall drilling machine and a pipe body such as a cab tire cable comprises buffer hydraulic cylinders And an accumulator for storing the hydraulic pressure from the buffer hydraulic cylinder, and equipped with a shock absorber for absorbing and relieving the load on the pipe body, so that the continuous continuous wall excavator can be operated, extended and wound up. Even if a sudden load is applied due to a time lag or the like, the load can be absorbed and buffered.

  Furthermore, at the open end of the tip frame of the jib, it can be rotated to a guide frame curved in an arc shape and a guide frame as a guide mechanism for supporting and smoothly winding and winding a tube such as a hydraulic hose etc. Since a plurality of guide rollers equipped in the above are equipped, the hydraulic hoses and other pipes are supported in a gentle arc by the guide mechanism and smoothly extended and guided to the underground continuous wall drilling machine, including the connecting parts. Can.

1, 1a, 1b, 1c ... underground continuous wall drilling machine 2, 2 2a, 2b, 2c ... base machine 2d ... base machine (obstacle)
3, 3a, 3b, 3c ... Jib 4 ... Support cable 5 ... Drilling area 6, 6a, 6b, 6c ... Reel 7 ... Tube body 7a ... Hydraulic hose 7b ... Cabtire cable 7c ... Communication cable 10, 10a, 10b, 10c ... Bucket 11, 12, ... Shell 13, 14 ... Tie rod 15, 16 ... Coupling pin 20 ... First hydraulic cylinder 21 ... Rod side end 22 ... Head side end 23, 33, 64, 93, 103 ... Rod 24 ... Cylinder 25, 26, 35, 36 Fixing pins 30 Second hydraulic cylinder 31 Rod side end 32 Head side end 34 Cylinder 40 Body frame 41 Shell mounting frame 42 Connecting frame 40a, 41a, 42a ... Windows 44: Slide plates 45a, 45b, 45c: Flanges 46a, 46b, 46c: Ribs 47, 48, 49: Pin holes 50: Slides Box 51: Sliding plate 52, 53, 54, 55: Pin hole 56: Hydraulic pump 57: Tank 60: Swirl frame 61: Pinion gear 62: Rack gear 63: Swirl hydraulic cylinder 65: Swivel shaft casing 66: Swivel shaft casing Mounting flange 67, 73 ... Bolt 68 ... Bearing 70 ... Support body 71 ... Pivot axis 72 ... Pivot axis mounting flange 77 ... Sheave mechanism 80 ... Guide mechanism 81 ... Tip frame 82 ... Tip sheave 83 ... Auxiliary sheave 84 ... Guide frame 85 ... Guide roller 86: Base frame 87: Fixed shaft 90: Shock absorber 91: Buffer hydraulic cylinder 92: Accumulator 94: Prada 100: Posture correction device 101: Posture correction box 102: Posture correction hydraulic cylinder 104: Posture correction plate 105 ... Rotating shaft 106 ... free rod

Claims (6)

In a underground continuous wall drilling machine which excavates a digging groove by opening and closing a bucket consisting of a pair of left and right shells,
A pivot shaft suspended from a support is inserted into a pivot frame mounted above the bucket, and a rack gear is engaged with a pinion gear connected to the pivot shaft, and a hydraulic cylinder for pivoting mounted in the pivot frame on the rack gear By connecting the rods and advancing and retracting the rack gear by the telescopic movement of the rods of the turning hydraulic cylinder,
The swing frame is pivotally supported on the support while the bucket is suspended by hooking a support cable which is extended and wound from a jib of the base machine around a sheave mechanism mounted on the support.
An underground continuous wall excavating machine characterized in that the bucket can be horizontally turned at an actual position. By advancing and retracting the rack gear, to pivot the pivot shaft connected to the pinion gear, by pivoting the pivot frame relative to the support, diaphragm wall excavator according to claim 1, wherein the pivoting horizontally bucket in situ . By advancing and retracting the rack gear from the state in which the pinion gear is in mesh with the center of the rack gear to the state in which the pinion gear is in mesh with one end or the other end of the rack gear,
The underground continuous wall excavating machine according to claim 1 or 2, wherein the bucket is turned 90 degrees in a state in which the pinion gear meshes with the center of the rack gear. By advancing and retracting the rack gear from the state in which the pinion gear is in mesh with one end of the rack gear to the state in which the pinion gear is in mesh with the other end,
The underground continuous wall excavating machine according to claim 1 or 2, wherein the bucket is turned 180 degrees in a state in which the pinion gear is in mesh with one end of the rack gear. A predetermined depth for constructing an underground continuous wall by suspending the underground continuous wall excavating machine according to any one of claims 1 to 4 to a base machine via a support cord and performing an operation of opening and closing a bucket. In the underground continuous wall excavating method of excavating, while filling the narrow channel into the channel with stabilizer to prevent collapse of the channel wall,
An underground continuous wall excavating method characterized in that the position of the bucket relative to the digging groove is adjusted by turning the bucket in an in-situ position. The underground continuous wall drilling method according to claim 5, wherein the position of the bucket relative to the digging groove is adjusted without moving the base machine relative to the digging groove.

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