JP4416537B2 - Groove excavation method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a groove excavation method suitable for excavating grooves for various uses on hard ground.

  For example, in order to embed a natural gas transport pipe underground, a trench is excavated over a long distance. In this case, first of all, a groove is excavated in the ground by vertical vibration of a chisel of a breaker attached to the articulated front of the self-propelled working machine, sand is put therein, a transport pipe is placed thereon, and sand to be further supplied The transport pipe is buried by a process such as filling the transport pipe, laying a protective plate thereon, and filling the groove above with crushed stone or the like.

  When excavating such a groove, the depth of the groove needs to be several times the diameter of the transport pipe (for example, 50 cm). For this reason, when excavation work is performed by attaching a chisel having a length of about several tens of centimeters to a breaker, such a depth cannot be excavated at one time. For this reason, excavation is performed with the chisel standing vertically with respect to the ground, and the first-stage groove reaching the penetration depth determined by the length of the chisel is excavated over the target groove width, and then the first The excavation operation of excavating the second-stage groove narrower than the groove width in the step groove is repeated one or more times, and the step-like residual portion left by the excavation operation is described in Patent Document 1, A working machine capable of tilting the breaker to the left or right with respect to the multi-joint front is used, and the breaker is fixed in an inclined posture by a fixing pin to excavate a stepped residual portion.

  That is, when excavating the stepped residual portion, in order to prevent interference between the breaker and the side wall portion, excavation is performed by fixing the breaker at a certain angle with respect to the articulated front by a pin. is there. In addition, as a conventional work machine using this type of breaker, a hydraulic excavator as a base machine, that is, a general articulated front with an arm attached to the tip of a U-shaped boom, is attached to the tip of the arm. I am using something.

Registered Utility Model No. 3030092

According to the groove excavation method described in the above publication, when excavating a stepped portion remaining on the side wall portion of the groove, the breaker is inclined right or left with respect to the articulated front. Of the reaction force, the upward component force acts as a force to bend the chisel, so that the chisel is easily broken and the output of the breaker cannot be raised so much. That is, in the case of using a conventional breaker, if the weight is about 1 t, the uniaxial compressive strength (σ) is only about 100 MPa (about 1000 kg / cm ² ) or less, and drilling is difficult, or the drilling efficiency is very poor. When excavating rocks made of lava such as extremely hard hard basalts with uniaxial compressive strength (σ) exceeding 300 MPa or 300 MPa, such as around Mt. Fuji, excavation of the stepped residual portion is performed by the conventional method. There is a risk that the chisel will break frequently and the drilling efficiency will be very poor.

  Further, in the case of an excavator using an inclinable breaker that uses the hydraulic excavator as a base machine, the horizontal component of the reaction force acting on the chisel attached to the inclined breaker is the swivel body of the work machine body. Since the operator acts as a force to rotate in the direction opposite to the direction of the chisel, it is necessary for the operator to always operate the swivel motor of the swivel device against the side wall of the groove, which is difficult to operate. is there. In addition, the rotational force in the turning direction of the turning device is simply designed to generate the turning force of the turning body, and is not designed to be used as a digging force. There is a problem that the cost and time loss required for parts replacement and assembly due to damage to the swivel device increase.

  In view of the above problems, the present invention can efficiently excavate the side wall portion even when excavating a groove deeper than the chisel length in a very hard ground, and can avoid damage to the chisel and the swivel device. It aims at providing the excavation method of a ditch.

(1) The groove excavation method of the present invention is a method in which a breaker is attached to the tip of an articulated front provided in a swing body of a self-propelled working machine, and a groove provided in the ground is excavated by a chisel attached to the breaker. And
As the working machine, a working machine installed via a swing device that can tilt the revolving body to the left and right with respect to the traveling body is used, and the breaker is tilted right or left together with the revolving body and the articulated front. The side wall portion of the groove is excavated by a chisel inclined by the above.

(2) Further, the groove excavation method of the present invention is a method of excavating with a chisel which attaches a breaker to the tip of an articulated front provided on a swing body of a self-propelled working machine and attaches a groove provided on the ground to the breaker. Because
Vertical digging with a vertical chisel, digging the first stage groove over the target groove width,
After excavating the first stage groove, the excavation operation of excavating the second stage groove narrower than the groove width in the first stage groove is repeated twice or more,
Using a working machine installed on a traveling body via a swinging device capable of tilting the swivel body to the left and right, the stepped residual portion left by the excavation work, the breaker as the swivel body, and the multi-joint It is characterized by excavating with a chisel inclined by tilting to the right or left together with the front.

(3) Further, the groove excavation method of the present invention is a method of excavating with a chisel that attaches a breaker to the tip of an articulated front provided on a revolving body of a self-propelled working machine and attaches a groove provided on the ground to the breaker. Because
Vertical digging with a vertical chisel, digging the first stage groove over the target groove width,
After excavating the first stage groove, excavating a second stage groove narrower than the groove width in the first stage groove;
Using a working machine installed on a traveling body via a swinging device capable of tilting the swivel body to the left and right, the stepped residual portion left by the excavation work, the breaker as the swivel body, and the multi-joint Drilling with a tilted chisel by tilting right or left with the front,
A third-stage groove narrower than the width of the second stage is excavated by vertical digging at the bottom of the second-stage groove excluding the remaining part, and then the remaining part of the third-stage groove is installed in the same manner as described above. The step of excavating with the chisel tilted to the right or left together with the swivel body and the articulated front is repeated over three stages or more.

(4) Further, the groove excavation method of the present invention is the groove excavation method according to (2) or (3),
A working machine dedicated to vertical digging is used for the vertical digging work, and a working machine equipped with the swing device is used for digging work of the remaining portion.

(5) Further, the groove excavation method of the present invention is the groove excavation method according to (2) or (3),
The working machine equipped with the swing device is also used for the vertical digging work and the excavation work of the remaining portion.

(6) Further, the groove excavation method of the present invention is the groove excavation method according to any one of (1) to (5),
A plurality of work machines having different crushing capacities are prepared as the work machines, and the work machines are arranged according to the hardness of the ground where the groove is excavated, and excavation work is performed in parallel.

(7) Further, the groove excavation method of the present invention is the groove excavation method according to any one of (1) to (6),
As the working machine, a short reach working machine using an articulated front composed of a short boom and a short arm is used.

(8) Further, the groove excavation method of the present invention is the groove excavation method according to any one of (1) to (7),
A chisel having a side surface provided with a groove in the vertical direction is used.

  In the present invention, when excavating a side wall portion of a groove, in particular, a portion remaining stepwise on the side wall portion of the groove after excavation with the chisel vertical, a device that allows the swinging body to swing left and right with respect to the traveling body is provided. When the swivel body is tilted to the right or left with the articulated front and breaker, the chisel is excavated in an inclined posture, so that the excavation reaction force acting on the chisel acts only in the axial direction of the chisel. Breakage and damage to the cutting device can be avoided, and damage to the chisel can be avoided even if the output is increased, so that the excavation ability can be increased.

  Further, when excavating the stepped residual portion, the revolving body is tilted together with the articulated front and the breaker, so that the excavation reaction force does not act as a force for revolving the revolving body, and the operator turns by the excavation reaction force. Since it is not necessary to pay attention to the turning of the body, the operation becomes easy, and damage to the turning device due to the excavation reaction force can be avoided, and troubles such as economical and extended work period can be avoided.

  FIG. 1 is a sectional view showing an example of a groove to which the groove excavation method of the present invention is applied. The groove 1 in this example is for embedding a natural gas transport pipe 50. The transport pipe 50 is filled with sand 51, and a protective plate 52 such as a stainless steel plate is placed on the sand 51 layer. A crushed stone 53 is filled thereon. For example, the outer diameter of the transport pipe 50 is 50 cm, the width W of the groove 1 is 100 cm, and the depth H is 180 cm.

  FIG. 2 is a process diagram showing an embodiment of an excavation method according to the present invention for excavating the groove 1. 1a, 1b, 1c, and 1d are grooves that are excavated with the chisel 2 and the breaker 3 vertically as shown by solid lines in FIG. 3 (hereinafter referred to as vertical digging), and are excavated in the order of 1a, 1b, 1c, and 1d. . 1e, 1f, and 1g are residual portions that remain stepwise at the second, third, and fourth vertical digging grooves 1b, 1c, and 1d, respectively. As shown, the chisel 2 and the breaker 3 are excavated while being tilted together with an articulated front 7 and a revolving body 6 described later. The crushing waste generated by excavation is discharged out of the groove using a hydraulic excavator or the like.

  Here, among these vertical digging grooves 1a to 1d, the depth a of the upper three-stage grooves 1a, 1b and 1c is the length b of the portion where the chisel 2 protrudes from the breaker 3 as shown in FIG. Is approximately equal to (a≈b), and in this example is approximately 50 cm. Further, the bottom vertical digging portion 1d is excavated from the bottom of the third stage vertical digging portion to a depth (y) of (180-50 × 3) = 30 cm so that the final excavation depth is about 180 cm. Is done.

  The width c of the stepped residual portions 1e, 1f, and 1g remaining on the side walls of the vertical digging grooves 1b, 1c, and 1d is substantially equal to the width d from the side surface of the chisel 2 to the side surface of the breaker 3 (c≈d). . That is, the width c of these remaining portions is less than the width of the chisel 2 in excavation in the second stage or less, so that when the side surface of the breaker 3 is abutted against the side wall portion in the groove, Since the width of the chisel 2 is smaller than the width of the breaker 3, it is the width of the portion that remains without being excavated.

  FIG. 4 is a side view showing an embodiment of a short digging machine for vertical digging used in the present invention. In FIG. 4, 4 is a crawler type traveling body, 5 is a turning device mounted on the traveling body 4, 6 is a turning body installed on the turning device 5, and 7 is a multi-joint attached to the turning body 6. Reference numeral 8 denotes a counterweight mounted on the rear part of the swing body 6. The articulated front 7 includes a short boom 7a, a short arm 7b, and hydraulic cylinders 7c and 7d for raising and lowering these. A breaker 3 as a work tool is attached to the tip of the articulated front 7, and the chisel 2 is attached to the breaker 3.

  The boom 7a is substantially linear, and is attached to the revolving structure 6 so that the boom 7a can be raised and lowered around the pin 9 by extending and contracting the hydraulic cylinder 7c for raising and lowering the boom. The boom hoisting hydraulic cylinder 7c has a base end connected to the revolving body 6 by a pin 10 and a tip end connected to the boom 7a, or preferably a top portion of the boom 7a by a pin 11 also serving as an arm connection as shown in the figure. To simplify the configuration. The boom hoisting hydraulic cylinder 7c has a length substantially equal to or close to the boom 7a, and is set so that the boom 7a is in a substantially vertical state when the cylinder stroke is at its maximum extension state.

  The arm 7b is substantially linear, and a hydraulic cylinder 7d for rotating the arm 7b is attached by connecting one end to the back of the boom 7a by a pin 12 and connecting the other end to the rear end of the arm 7b by a pin 13. .

  The breaker 3 is rotatably attached to the tip of the arm 7b by a pin 15. The hydraulic cylinder 16 for rotating the breaker 3 has one end connected to the arm 7b by a pin 17 and the other end connected to the links 20 and 21 by a pin 19, and the links 20 and 21 are respectively connected to the arms 7b and 23 by pins 22 and 23, respectively. Connect to breaker 3.

  Using the working machine configured as described above, the vertical digging grooves 1a, 1b, 1c, and 1d are sequentially excavated.

  As described above, it is desirable to set the boom 7a and the arm 7b to have substantially the same length, so that the working radius at the tip position of the arm 7b is smaller than that of the conventional hydraulic excavator, and the arm 7b travels on the tip. It can approach to the vicinity of the body 4, and can further reduce the overturning moment on the front side. More specifically, the preferred length of the boom 7a when carrying out the excavation method of the present invention is about 0.5 to 1.0 times the front-rear width of the traveling body 4 (the boom length of the conventional excavator is the traveling length). The length of the arm 7b is preferably about 0.8 to 1.2 times the length of the boom 7a.

  As described above, the articulated front 7 can be shortened to reduce the overturning moment, so that the breaker 3 having a larger crushing force than the standard can be mounted. That is, the conventional working machine uses a standard type hydraulic excavator, that is, a boom whose boom length is about 1.3 times the front and rear width of the traveling body, and is attached to the tip of the articulated front composed of the boom and the arm. Since the breaker is attached, the weight including the articulated front and the breaker and the overturning moment increase, and the weight of the counterweight corresponding to this increases. However, since the weight of the counterweight is limited, the combined weight of the breaker and the multi-joint front is also limited, so the multi-joint front that is long and has a large tipping moment can be attached to its tip. There is a limit to the weight of the breaker that can be used.

  On the other hand, in the present embodiment, by using the short reach type work machine, the overturning moment due to the articulated front 7 is greatly reduced, so that a breaker 3 having a large weight and a large output can be attached. It is possible to excavate efficiently even on hard ground with a uniaxial compressive strength σ of 300 MPa.

  For example, when the breaker 3 is attached to the tip of the articulated front 7 in a conventional general hydraulic excavator with a total weight including the bucket of 12 t instead of the bucket, only a weight of about 1 t can be attached. Only those having a strength of about 100 MPa hardness can be crushed. On the other hand, when the short reach type working machine is configured using the main body (running body 4 and revolving body 6) of the same standard, not only can the size be reduced, but a 1.3t breaker 3 can be attached. it can. The 1.3t breaker 3 can excavate the ground having a uniaxial compressive strength σ of 150 MPa. Similarly, when the short reach type front 7 is used instead of the multi-joint front having a long boom generally used for a hydraulic excavator having a main body weight of 18 t, a 1.8 t breaker 3 can be attached, The ground can be crushed. Similarly, when the short reach type front 7 is used instead of the general articulated front having a main body weight of 2t and having a long boom, a 2.2t breaker 3 can be attached, Drilling becomes possible.

  In the present invention, when the large breaker 3 is mounted, the strength of the front is increased, such as increasing the thickness of the boom 7a and the arm 7b, so that the operation of the large breaker 3 can be endured. It is desirable to increase the weight of the counterweight 8 provided at the rear portion of the revolving structure 6 in order to use a pin having a larger diameter than that of a standard pin and further ensure the stability of the vehicle body.

  FIG. 5A is a side view of a chisel 2 suitable for use in the trench excavation method of the present invention, and FIG. 5B is an EE cross-sectional view thereof. The chisel 2 is provided with a plurality of grooves 2a (four in the illustrated example) in the vertical direction from the tip to the periphery. Reference numeral 2 b denotes an attachment portion of the chisel 2 to the breaker 3, which has an engaging recess 2 c for a stopper pin provided in the breaker 3. The tip 2e of the chisel 2 is formed in a taper shape. Further, a core material 2d made of an ultra-hard material is provided at the center of the chisel 2 so that excavation can be facilitated even on hard rock. The chisel 2 is used for reuse by polishing the tip 2e into a square or the like. In this case as well, a groove 2a is provided in the flat portion 2f by polishing.

  If the chisel 2 having such a groove 2a is used, the air compressed between the tip of the chisel 2 and the crushing portion by the vertical movement of the chisel 2 flows out through the groove 2a. The occurrence of an explosive crushing phenomenon caused by the high pressure of the air at the tip of the chisel 2 is also prevented during excavation. For this reason, there is a problem of poor visibility due to dust generated by the explosive crushing phenomenon, resulting in a reduction in work efficiency due to interruption of crushing work that occurs, and a reduction in crushing efficiency due to a sealed space (air cushion) at the tip of the chisel Is eliminated, and the crushing operation can be performed efficiently. In addition, problems such as pneumoconiosis caused by dust and the like are also eliminated.

  Moreover, as shown in FIG. 4, by attaching a watering device comprising a nozzle 30 and a water supply pipe 31 to the breaker 3, and spraying water from the nozzle 30 to the crushing portion of the ground, the generation of dust is more completely prevented. Can do. And thereby, a crushing part can be visually observed more clearly and the health hazard of operators, such as a pneumoconiosis, can be prevented more completely. In this example, the operator has control means (not shown) such as a pedal for watering and stopping the watering by the watering device so that the operator can control the watering and stopping during the operation. . As water used for the watering, stored water or natural water can be boosted with a pump in addition to tap water having a predetermined water pressure.

  Next, after the excavation of one free surface of the vertical digging grooves 1a to 1d (the shattering dust scattering direction is only upward) is finished, the remaining portions 1e to 1g are excavated. The excavation of these remaining portions 1e to 1g is excavation on two free surfaces (the crushed debris is scattered in two directions, the upward direction and the lateral direction).

  FIG. 6 is a front view showing a main body of a working machine for excavating the remaining portions 1e to 1f, and FIGS. 7 and 8 are views of the working machine showing a state in which the remaining portions 1e to 1g are being crushed, respectively. It is a front view and a side view. As shown in these drawings, this working machine constitutes a short reach type working machine as described above.

  This working machine installs the turning device 5 on the traveling body frame 4a via the swing device 32 so that the swing body 6 can swing left and right. The swing device 32 is attached to the base frame 5a of the swivel device 5 via pivot pins 33 provided at the front and rear of the center portion of the traveling body frame 4a, and the left and right sides of the base frame 5a and the left and right sides of the traveling body frame 4a. Oscillating hydraulic cylinders 34 and 35 are connected to each other by connecting pins 36, 37 and 38, 39 at both ends.

  When excavating the remaining portions 1e to 1g with this work machine, as shown in FIGS. 7 and 8, the left and right crawlers of the traveling body 1 are positioned on both sides of the groove 1, and the work machine is straddled. By extending one of the swing hydraulic cylinders 34 and 35 and contracting the other, the revolving body 6, the articulated front 7 and the breaker 3 are integrally inclined. Thereby, the chisel 2 also inclines simultaneously, and excavation of the remaining parts 1e-1g (2 free surface excavation) can be performed, without the breaker 3 interfering with the side wall part of a groove | channel. This two free surface excavation can be excavated relatively easily than the vertical excavation because the ground is cracked by the vertical excavation.

  As described above, when excavating the portions 1e to 1g remaining in the stepped shape on the side wall of the groove, the swinging device 32 that can tilt the swinging body 6 to the left and right with respect to the traveling body 4 is used. By tilting the chisel 2 to the right or left together with the articulated front 7 and the breaker 3, the chisel 2 is excavated in an inclined posture, so that the excavation reaction force acting on the chisel 2 acts only in the axial direction of the chisel 2. 2 breakage can be avoided. Moreover, since breakage of the chisel 2 can be avoided, the chisel 2 can be vibrated by a large vibration force, and the excavation ability can be increased.

  Further, when excavating the stepped residual portions 1e to 1g, the revolving body 6 is inclined together with the articulated front 7 and the breaker 3, so that the excavation reaction force does not act as a force for revolving the revolving body 6. Since the operator does not need to pay attention to the turning of the revolving structure 6 due to the excavation reaction force, the operation becomes easy and the damage to the turning device 5 due to the excavation reaction force can be avoided. Can be avoided.

  FIG. 9 is a process diagram showing another embodiment of the groove excavation method of the present invention. In this embodiment, as shown in FIG. 9A, the first-stage and second-stage grooves 1a and 1b of the depth a are respectively excavated by a chisel in a vertical posture. In this case, the reason why the width of the second-stage groove 1b is narrower by c on both sides than the first-stage groove 1a is as described above. By performing such excavation, the remaining portion 1e remaining on the side wall of the second-stage groove 1b is tilted with the chisel 2 together with the multi-joint front 7 and the swivel body 6 as shown in FIGS. Excavate in the state of letting.

  Next, as shown in FIG. 9 (B), the bottom of the groove 1h excavated in this way is a vertical chisel and the third stage groove 1i is left by vertical excavation leaving the remaining portion 1j of the width c. Drilling. Then, the remaining portion 1j remaining on the side wall portion of the third-stage groove 1i is excavated in a state where the chisel 2 is inclined together with the articulated front 7 and the swivel body 6 as shown in FIGS.

  Next, as shown in FIG. 9C, from the bottom of the groove 1k excavated as described above, the fourth-stage groove 1m is formed by a vertical chisel so that the final depth becomes the depth H. Drill by vertical digging. Thereafter, the remaining portion 1n of the side wall portion of the fourth-stage groove 1m is excavated in a state where the chisel 2 is inclined together with the articulated front 7 and the revolving body 6 as shown in FIGS.

  The method of excavating a groove by the process shown in FIG. 9 is a method suitable for excavation using a breaker having a relatively large output as compared with the process of FIG.

  When excavating a groove by the process of FIG. 2 or FIG. 9, the vertical digging uses the working machine that performs only the vertical digging shown in FIG. A method using a working machine having the device 32 can be employed. This method has an advantage that the working machine (crusher) shown in FIG. 4 used for shaft excavation can participate in the excavation of the groove.

  In addition, when excavating a groove by the steps of FIG. 2 and FIG. 9, a working machine including the swing device 32 may be used for the vertical excavation work and the excavation work of the remaining portion. That is, since the working machine shown in FIGS. 6 to 8 can dig with the revolving body 6, the articulated front 7 and the breaker 3 in a vertical posture, the vertical digging is performed in this vertical posture, and the inclined posture is performed. The remaining part can be excavated.

  Thus, if vertical digging and inclined digging are performed with one working machine having the swinging device 32, the number of units can be reduced and it is economical. Further, if a material having a weight of about 4 t and a main body weight of about 40 t is used, even the hard ground having the uniaxial compressive strength σ of about 300 MPa can be excavated efficiently. According to experiments, it was confirmed that the level of generated noise was lower when using such a high-power breaker than when excavating hard rock with a low-power breaker. This is because the power of the chisel is efficiently used for crushing the rock mass when crushing the rock mass with a large output, and the hard rock mass is not effectively converted to crushing with a small output power, and the unconverted force is converted to a metallic sound It is considered to be converted.

  Moreover, as the work machine, preparing a plurality of work machines having different crushing capacities, arranging these work machines according to the hardness of the ground where the groove is excavated, and performing excavation work in parallel, output Therefore, it is possible to perform excavation work efficiently.

It is sectional drawing which shows the structure of the buried groove of the pipe which employ | adopts the excavation method of the groove | channel of this invention. It is process drawing which shows one Embodiment of the excavation method of the groove | channel of this invention. It is a figure which shows the attitude | position and dimensional relationship of the chisel of a vertical excavation and an inclined excavation in the excavation method of the groove | channel of this invention. It is a side view which shows the working machine which performs a vertical digging in a working state in the excavation method of the groove | channel of this invention. (A) is a side view of a chisel suitable for use in the groove excavation method of the present invention, and (B) is an EE cross-sectional view thereof. It is a front view which shows an example of the main-body part of the working machine used for the inclined digging in the excavation method of the groove | channel of this invention. It is a front view which shows an example of the working machine used for the inclined digging in the excavation method of the groove | channel of this invention in a working state. It is a side view which shows an example of the working machine used for the inclined digging in the excavation method of the groove | channel of this invention in a working state. It is process drawing which shows other embodiment of the excavation method of the groove | channel of this invention.

Explanation of symbols

1, 1a-1d, 1h, 1k: groove, 1e-1g, 1j, 1n: remaining portion, 2: chisel, 2a: groove, 3: breaker, 4: traveling body, 4a: traveling body frame, 5: turning device , 6: swivel body, 7: articulated front, 7a: boom, 7b: arm, 7c, 7d: hydraulic cylinder, 8: counterweight, 16: hydraulic cylinder, 30: nozzle for sprinkling, 32: swinging device, 33 : Pivot pin, 34, 35: Hydraulic cylinder

Claims (8)

A method of attaching a breaker to the tip of an articulated front provided in a swing body of a self-propelled working machine, and excavating a groove provided in the ground with a chisel attached to the breaker,
As the working machine, a working machine installed via a swing device that can tilt the revolving body to the left and right with respect to the traveling body is used, and the breaker is tilted right or left together with the revolving body and the articulated front. A groove excavation method characterized by excavating a side wall portion of the groove with a chisel inclined by the operation. A method of attaching a breaker to the tip of an articulated front provided in a swing body of a self-propelled working machine, and excavating a groove provided in the ground with a chisel attached to the breaker,
Vertical digging with a vertical chisel, digging the first stage groove over the target groove width,
After excavating the first stage groove, the excavation operation of excavating the second stage groove narrower than the groove width in the first stage groove is repeated twice or more,
Using a working machine installed on a traveling body via a swinging device capable of tilting the swivel body to the left and right, the stepped residual portion left by the excavation work, the breaker as the swivel body, and the multi-joint A trench excavation method characterized by excavating with a chisel tilted to the right or left along with the front. A method of attaching a breaker to the tip of an articulated front provided in a swing body of a self-propelled working machine, and excavating a groove provided in the ground with a chisel attached to the breaker,
Vertical digging with a vertical chisel, digging the first stage groove over the target groove width,
After excavating the first stage groove, excavating a second stage groove narrower than the groove width in the first stage groove;
Using a working machine installed on a traveling body via a swinging device capable of tilting the swivel body to the left and right, the stepped residual portion left by the excavation work, the breaker as the swivel body, and the multi-joint Drilling with a tilted chisel by tilting right or left with the front,
A third-stage groove narrower than the width of the second stage is excavated by vertical digging at the bottom of the second-stage groove excluding the remaining part, and then the remaining part of the third-stage groove is installed in the same manner as described above. A groove excavation method characterized by repeating a step of excavating with a chisel inclined by tilting to the right or left together with the swivel body and the articulated front over three or more stages. In the groove excavation method according to claim 2 or 3,
A groove excavation method characterized in that a vertical digging work machine is used for the vertical digging work, and a work machine equipped with the swing device is used for excavating the remaining part. In the groove excavation method according to claim 2 or 3,
An excavation method for a groove, wherein the vertical excavation work and the excavation work for the remaining portion are also used as a work machine including the swing device. In the excavation method of the groove | channel in any one of Claim 1-5,
A plurality of working machines having different crushing capacities are prepared as the working machines, the working machines are arranged according to the hardness of the ground where the groove is excavated, and excavation work is performed in parallel. Excavation method. In the trench excavation method according to any one of claims 1 to 6,
A trench excavation method using a short reach type working machine using an articulated front composed of a short boom and a short arm as the working machine. In the trench excavation method according to any one of claims 1 to 7,
A groove excavation method using a chisel having a side surface provided with a groove in the vertical direction.

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