JP2015197000A - Method for relief from collapse accident, and double-pipe horizontal borer for use in relief - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable early life saving by enabling excavation appropriate for the soil of collapse sediment.SOLUTION: Collapse sediment 120 is penetrated by being horizontally excavated with a double pipe having an excavation rod inserted into a casing rod 11. The inside of the casing rod 11 is used as a personnel passage by pulling out the excavation rod from the casing rod 11 with the casing rod 11 remaining in the collapse sediment. One rod selected from among a plurality of rods as the excavation rod is replaced depending on the soil of the collapse sediment.

Description

  The present invention relates to a relief method for relieving personnel left in the tunnel or the like during excavation of a tunnel or the like after the completion of excavation, and a double-tube horizontal excavator used in the relief method.

  It is necessary to relieve workers and passersby if the roof collapses during tunnel excavation or after completion of excavation, and the tunnel is blocked by collapsible earth and sand, leaving workers or passersby in the accident pit. is there. If the amount of collapsed sediment is small, it can be remedied by simply removing the sediment with a power shovel or the like. Endangered.

  In this case, it is conceivable to make a hole in the collapsed earth and sand to form a communication hole to the accident pit, and to rescue personnel such as workers through the communication hole. For example, a double-pipe excavator described in Patent Document 1 is used for drilling the communication hole. In this double pipe excavator, an excavator body for excavation is mounted on a traveling crawler and travels in a tunnel.

  The excavator body in the double pipe excavator excavates a communication hole (excavation hole) with a double pipe comprising a casing rod and an excavating rod inserted into the casing rod, and the casing rod and excavating rod are excavators. It is held by each drill head provided in the main body and is fed and rotated. Each drill head is driven by the hydraulic pressure of a main power unit provided separately from the excavator body.

  Such a double-pipe excavator self-propels to the collapse site in the tunnel, rotates and feeds the excavation rod and the casing rod, and excavates these collapse rods and the casing rod while penetrating the collapsed soil. After penetrating the landslide, the excavation rod is pulled out from the casing rod while leaving the casing rod in the landslide. Thereby, personnel such as workers in the accident mine can move inside the casing rod and escape from the accident mine.

Japanese Patent Laid-Open No. 5-33589

  When excavating collapsible earth and sand starting with a conventional double pipe excavator, one type of excavation rod is used, and an auger rod capable of high-speed excavation in relation to the excavation speed is mainly used as the excavation rod. . Excavation with an auger rod is possible if the soil quality of the fallen sediment is mixed with gravel. However, in the case of earth and sand including boulders mixed with boulders, boulders and rocks, it is difficult to excavate with auger rods, and the drilling of communication holes for collapsible earth and sand becomes a long time, making it difficult to save lives early. Yes.

  The present invention has been made in consideration of such circumstances, and by enabling excavation according to the soil quality of the fallen sediment, the relief direction from the fall accident that enabled early life relief and this relief. The purpose is to provide a double-pipe horizontal excavator to be used in the construction.

The present invention provides a relief method from a collapse accident by excavating collapsed sand in a horizontal direction with a double pipe with a drill rod inserted into the casing rod to penetrate the collapsed sand and leaving the casing rod in the collapsed sand. The above-mentioned excavation rod is pulled out from the casing rod and then the inside of the casing rod is a relief method from a collapse accident in which a passage for personnel is selected, and the excavation rod is selected from the following (1) to (3) It is characterized by exchanging one of the rods according to the soil quality of the collapsed soil.
(1) An auger rod having an auger bit at the tip (2) An auger rod connected to the tip of an air hammer having a fixed digging diameter (3) An auger rod connected to the tip of an air hammer capable of expanding or reducing the digging diameter

  In this case, it is preferable to reciprocate the movable body in which the personnel can get inside the casing rod remaining in the collapsed earth and sand.

A double pipe horizontal excavator used for relief from a collapse accident according to the present invention includes a first drill head for holding and rotating a casing rod, and a second drill head for holding and rotating a drill rod inserted into the casing rod. Attached to the excavator body, the first drill head and the second drill head are driven by the hydraulic pressure of the main power unit, and the collapsible sediment is excavated horizontally by a double pipe comprising the casing rod and the excavating rod, The excavator body is a double-pipe horizontal excavator in which the main body of the excavator travels on the ground by the driving force of the traveling power unit, and one selected from the following (1) to (3) with respect to the second drill head The excavation rod is replaceable, and the traveling power unit is connected to the main power unit with the first drill head and Wherein the switching supply of driving force to the 2 drill head is possible.
(1) An auger rod having an auger bit at the tip (2) An auger rod connected to the tip of an air hammer having a fixed digging diameter (3) An auger rod connected to the tip of an air hammer capable of expanding or reducing the digging diameter

  According to the relief method from the collapse accident according to the present invention, the casing rod penetrating the collapsed earth and sand and remaining in the collapsed earth and sand is used as a passage for personnel, so that the person moves through the casing rod and escapes from the accident pit. Can do. In addition, when excavating collapsible sediment, a plurality of excavation rods are exchanged according to the soil quality of the collapsible sediment, so that not only sediment and sand mixed with gravel, but also gravel-mixed rocks, boulders and rocks containing rocks, etc. However, any landslide can be quickly excavated in a short time, and early life saving is possible.

  According to the double pipe horizontal excavator used for the relief method from the collapse accident according to the present invention, since a plurality of drill rods can be selected and replaced with respect to the second drill head, it corresponds to the soil quality of the collapsed soil. Drilling is possible, and rapid drilling is possible. Therefore, it can be suitably used for the above-described relief method from the collapse accident.

It is sectional drawing which shows 1st Embodiment of the relief method from the collapse accident of this invention. It is sectional drawing which shows 2nd Embodiment of this invention. It is sectional drawing which shows the state following FIG. The other example of a moving body is shown, (A) is sectional drawing, (B) is an end elevation. It is a front view which shows the whole double pipe horizontal excavator used for the relief method from the collapse accident of this invention. It is a top view of a double pipe horizontal excavator. (A) is a top view which shows a reaction force board, (B) is a side view. It is sectional drawing which shows the 1st example of the double tube used for this invention. It is sectional drawing which shows the 2nd example of the double tube used for this invention. It is sectional drawing which shows the 3rd example of the double tube used for this invention. It is sectional drawing which shows a casing rod. (A)-(C) are sectional drawings which show the operation | movement which excavates landslide sand using the double pipe of a 1st example. (A)-(C) are sectional drawings which show the operation | movement which excavates landslide sand using the double pipe of a 2nd example. (A)-(C) are sectional drawings which show the operation | movement which excavates landslide sand using the double pipe of a 3rd example. (A) And (B) is sectional drawing and bottom view explaining the expansion / contraction operation | movement of the excavation diameter in the double pipe of the 3rd example.

FIG. 1 shows a first embodiment of a method for relieving a collapse accident according to the present invention, and FIGS. 2 and 3 show a second embodiment. In these embodiments, the present invention is applied to a tunnel 110, and the tunnel 110 is excavated in a horizontal direction with respect to the ground (the ground 100). The tunnel 110 is blocked by the fallen earth and sand 120 due to the fall accident of the natural ground, and a worker M such as an operator is left behind in the accident mine ahead (right side) of the fallen earth and sand 120.

  When the personnel M is relieved, first, the casing rod 11 is passed through the collapsed earth and sand 120 to communicate with the accident mine where the personnel M is left behind. Thereafter, the inside of the casing rod 11 penetrating the collapsible earth and sand 120 is used as a passage for the personnel M, thereby causing the personnel M to escape from the accident pit.

  As the casing rod 11, an outer tube in the double tube shown in FIGS. As shown in FIGS. 8 to 10, the double pipe is formed by a hollow casing rod 11 that is an outer pipe and an excavation rod 12 that is inserted into the casing rod 11 as an inner pipe. . In the present invention, as the double pipe, an excavating rod 12 that is an inner pipe can be selected and exchanged with respect to the casing rod 11, and the excavating rod 12 is selected and exchanged according to the soil quality of the collapsed sediment 120. (See FIGS. 8 to 10). Hereinafter, the double pipe used in the present invention will be described.

  The excavation rod 12 shown in FIG. 8 is formed by a spiral auger rod 21 and an auger bit 22 connected to the tip of the auger rod 21. A tip 22a made of a super hard material is attached to the tip of the auger bit 22, and the fallen earth and sand 120 is excavated by rotation, and the excavated earth and sand is sent to the rear side to be discharged. The double pipe shown in FIG. 8 is used, for example, when the collapsed sand 120 is mixed with gravel.

  The excavating rod 12 shown in FIG. 9 has an air hammer 23 connected to the tip of a spiral auger rod 21. A drill bit 25 having a fixed excavation diameter and having a tip 25 a is attached to the tip of the air hammer 23. The air hammer 23 has a piston inside, and the drill bit 25 at the tip excavates the collapsible earth and sand 120 by the impact load. As the air hammer 23, a down-the-hole hammer that applies a striking force to the ground by reciprocating the piston by compressed air can be used. The double pipe shown in FIG. 9 is used when the collapsible earth and sand 120 are mixed with gravel to form a boulder layer.

  In the excavation rod 12 shown in FIG. 10, an air hammer 27 is connected to the tip of a spiral auger rod 21, and an expansion / contraction bit 28 capable of expanding and contracting is attached to the tip of the air hammer 27. As the air hammer 27, a down-the-hole hammer is used similarly to the air hammer 23 shown in FIG. 9, and the expansion / contraction bit 28 excavates the fallen earth and sand 120 by hitting the air hammer 27. The expansion / contraction bit 28 is expanded in diameter by a reaction force pressed against the ground. Due to this diameter expansion, the excavation rod 12 has a larger diameter than the casing rod 11 and excavates. The double pipe shown in FIG. 10 is used when the collapsible earth and sand 120 is formed of, for example, a boulder layer or a bedrock.

  In this way, by exchanging the plurality of excavating rods 12 according to the soil quality of the collapsed sediment 120, not only the sediment mixed with gravel, but also the collapsed sediment that includes gravel-mixed rocks and rocks. Even 120 can be excavated quickly in a short time. The double pipe shown in FIGS. 8 to 10 is mounted on the double pipe horizontal excavator 1 shown in FIGS. 5 to 7 to excavate the collapsed ground 120. The double pipe horizontal excavator 1 will be described later.

  In FIG. 1, after collapsing the landslide 120 with the above-mentioned double pipe and penetrating it, the digging rod 12, which is an inner pipe, is pulled out from the casing rod 11, and the casing rod 11, which is an outer pipe, is crushed. An embodiment is shown in which the person M is saved in this state and the person M is rescued in this state. In this case, the personnel M can escape from the accident pit by moving the personnel M using the inside of the hollow casing rod 11 as a passage.

  2 and 3 show an embodiment in which the capsule 130 as a moving body is reciprocated with respect to the casing rod 11 remaining in the collapsed earth and sand 120. FIG. The capsule 130 as a moving body is formed by a capsule main body 131 that is formed to have a size that allows the person M to sleep and a wheel 133 that is attached to the capsule main body 131. In order to reciprocate the capsule 130 inside the casing rod 11, a wire 141 drawn from the wire driving device 142 is connected to one side (left end side) of the capsule 130.

  As shown in FIG. 2, the capsule 130 is moved in the direction of the accident mine (right direction) through the casing 141 through the wire 141 when the wire driving device 142 is driven. After reaching the accident pit, the capsule 130 comes out of the casing rod 11 as shown in FIG. After the person M gets on the capsule 130, the wire driving device 142 is reversely driven to move the capsule 130 in the reverse direction (leftward). Thereby, personnel M can escape from the accident pit.

  FIG. 4 shows another example of a moving body in which the person M can get in because it is used for the escape of the person M. A carriage 150 is used as the moving body. The carriage 150 includes a carriage main body 151 that can be boarded with the person M sleeping, and wheels 153 attached to the carriage main body 151. Further, side covers 152 for protecting the personnel M are provided on both sides of the carriage main body 151. Reference numeral 157 denotes an illuminating device, and reference numeral 158 denotes a battery, which are provided on both the left and right sides of the cart body 151 in the longitudinal direction. A joint 155 for connecting the wire 141 from the wire driving device 142 (see FIG. 2) is attached to the carriage main body 151. Such a carriage 150 reciprocates in the casing rod 11 remaining in the collapsed sand 120, so that the person M can escape.

  As the moving body, means other than the capsule 130 and the carriage 150 can be used. For example, a sled can be used as the moving body. In addition, the present invention can be similarly applied to a collapse accident other than a tunnel, for example, in the case of a road blockage due to a landslide.

  Next, the double pipe horizontal excavator 1 used for the relief method of the present invention will be described. 5 and 6 show the double pipe horizontal excavator 1, FIG. 5 is a side view, and FIG. 6 is a plan view. The double pipe horizontal excavator 1 is formed by mounting an excavator body 2 on a crawler 3 as a traveling body that travels on the ground. A main power unit 9 that moves following the excavator main body 2 as the excavator main body 2 moves is provided separately from the excavator main body 2. The excavator body 2 includes a frame 4 supported by the crawler 3, a first drill head 5 attached to the frame 4, a second drill head 6, and a traveling power unit 7. The frame 4 has a plate shape and extends along the traveling direction of the double-pipe horizontal excavator 1, and a casing clamp 8 that supports a casing rod 11 (described later) with a clamp is provided at the extended tip.

  The first drill head 5 and the second drill head 6 are provided on the frame 4 along the traveling direction of the double-pipe horizontal excavator 1, with the first drill head 5 on the front side and the second drill head 6 on the front side. Located on the back side. The first drill head 5 chucks and holds the casing rod 11 with a known structure, and rotates the casing rod 11 in this holding state. The same applies to the second drill head 6, and the excavation rod 12 is chucked and held by a known structure, and the excavation rod 12 is rotated in this holding state. The first drill head 5 and the second drill head 6 are basically rotated by the hydraulic pressure of the main power unit 9.

  The first drill head 5 and the second drill head 6 are fed while the corresponding rods 11 and 21 are held, and thereby the corresponding rods 11 and 21 are fed in the horizontal direction. The drill heads 5 and 6 are fed by hydraulic pressure from the main power unit 9.

The main power unit 9 has an electric motor and an oil pump for rotating and feeding the drill heads 5 and 6. The oil pump is formed by combining a plurality of oil pumps having different feed speeds. In order to ensure the straightness of the first drill head 5 and the second drill head 6 during feeding, two parallel lines extending linearly along the traveling direction of the double-pipe horizontal excavator 1 are provided on the frame 4. A guide rail 10 is provided (see FIG. 6).

  The traveling power unit 7 drives the crawler 3 and includes an engine for that purpose. The traveling power unit 7 has a function of driving the first drill head 5 and the second drill head 6 in addition to the traveling of the crawler 3, and includes an oil pump for that purpose. Thus, the traveling power unit 7 drives the drill heads 5 and 6 to advance the casing rod 11 and the excavation rod 12 held by the drill heads 5 and 6. The oil pump in the traveling power unit 7 is the same as the oil pump in the main power unit 9 and is formed by combining a plurality of oil pumps having different feed speeds. The feed drive by the traveling power unit 7 can be performed by switching to the drive drive of the main power unit 9.

  As shown in FIG. 5, reaction force plates 13 are provided before and after the excavator body 2. One end of the reaction force plate 13 is attached to the other end of the reaction force cylinder 15 attached to the front and rear of the frame 4 of the excavator body 2. The reaction force plate 13 functions as a reaction force receiver by being pressed against the ground while being excavated. The reaction force cylinder 15 extends to press the reaction force plate 13 against the ground. When the reaction force plate 13 is not required, the reaction force plate 13 is shortened so that the reaction force plate 13 is separated from the ground. Operate.

FIG. 7 shows the reaction force plate 13, which has a plate body 13 a whose left and right side portions are connected to a reaction force cylinder 15 via hinge members 16. The plate body 13a extends in the width direction of the frame 4, and a plurality of anchor pins 17 are fixed to the substantially entire surface by screws. The plurality of anchor pins 17 protrude to the back side of the plate body 13a, and when the reaction force plate 13 is pressed against the ground, it bites into the ground surface, and this bite becomes a strong reaction force receiver. In addition, a plurality of anchor holes 18 are formed in the plate body 13a so as to penetrate in the thickness direction. Each anchor hole 18 is an opening for placing an anchor rod (not shown) in the ground. By placing the anchor rod in the anchor hole 18, the double-pipe horizontal excavator 1 with respect to the ground is provided. Can be firmly fixed. By providing such a reaction force plate 13, it is possible to cope with high thrust exceeding the dead weight of the double-pipe horizontal excavator 1 acting during excavation, and stable excavation even for collapsible soil with different soil properties. Is possible.

  The double pipe horizontal excavator 1 excavates landslide sand in a horizontal direction by a double pipe of a casing rod 11 and a drill rod 12 inserted into the casing rod 11 to excavate landslide sand. The drill head 5 holds a casing rod 11 serving as an outer pipe, and the second drill head 6 holds a drill rod 12 serving as an inner pipe. In the double pipe horizontal excavator 1, the second drill head 6 can select and replace a plurality of excavation rods 12.

  8 to 10 show drill rods 12 that can be selected and exchanged with respect to the second drill head 6, and each drill rod 12 is inserted into the casing rod 11. The excavation rod 12 shown in FIG. 8 is formed by a spiral auger rod 21 and an auger bit 22 connected to the tip of the auger rod 21. The auger bit 22 excavates landslide sand by rotation, and a tip 22a made of a super hard material is attached to the tip thereof. When the excavating rod 12 shown in FIG. 8 is rotated while being advanced, the auger bit 22 excavates the collapsed earth and sand, and the auger rod 21 sends the excavated earth and sand to the rear side in the axial direction and discharges it. The rotation and advance of the auger rod 21 are performed by driving the second drill head 6 by the hydraulic pressure from the main power unit 9. However, when the main power unit 9 does not operate due to down or the like, the auger rod 21 is switched to the main power unit 9. This is performed by the hydraulic pressure from the traveling power unit 7 that is provided. The double pipe shown in FIG. 8 is suitably used, for example, for excavating collapsible sand (FIG. 12) mixed with gravel.

  The excavation rod 12 shown in FIG. 9 is formed by connecting an air hammer 23 to the tip of a spiral auger rod 21. A drill bit 25 having a fixed excavation diameter and having a tip 25 a is attached to the tip of the air hammer 23. The air hammer 23 has a piston inside, and the drill bit 25 at the tip excavates the collapsed earth and sand by the impact load. As the air hammer 23, a down-the-hole hammer can be used in which the piston is reciprocated by compressed air and the striking force is applied to the falling soil. 9 is also performed by driving the second drill head 6 by hydraulic pressure from the main power unit 9, but when the main power unit 9 does not operate due to down or the like, it is switched to the main power unit 9. This is performed by hydraulic pressure from the traveling power unit 7. The double pipe shown in FIG. 9 is suitably used for excavating collapsible earth and sand (FIG. 13) composed of a boulder-mixed boulder layer.

  In the excavation rod 12 shown in FIG. 10, an air hammer 27 is connected to the tip of a spiral auger rod 21, and an expansion / contraction bit 28 capable of expanding and contracting is attached to the tip of the air hammer 27. A down-the-hole hammer is used as the air hammer 27 in the same manner as the air hammer 23 shown in FIG. 9, and the expansion / contraction bit 28 excavates landslide sand by hitting the air hammer 27. The expansion / contraction bit 28 is expanded in diameter by a reaction force pressed against the collapsed soil. The excavation rod 12 in FIG. 10 has a diameter larger than that of the casing rod 11 due to the increased excavation diameter. Excavation by the excavation rod 12 in FIG. 10 is also performed by driving the second drill head 6 by hydraulic pressure from the main power unit 9, but when the main power unit 9 does not operate due to down or the like, it is switched to the main power unit 9. This is performed by hydraulic pressure from the traveling power unit 7. The double pipe shown in FIG. 10 is suitably used, for example, for excavating collapsible earth and sand (FIG. 14) including a boulder layer and bedrock.

  Note that, as shown in FIGS. 8 to 10, tips 43 are attached to the tip of the casing rod 11 serving as the outer tube at a predetermined interval in the circumferential direction.

  FIG. 11 shows the casing rod 11. The casing rod 11 is formed by a long main body portion 31 and connecting portions 33 and 33 a welded to both left and right end portions of the main body portion 31. The connecting portions 33 and 33a are connected to the adjacent casing rod 11 and are provided with connecting means 35 therefor.

In FIG. 11, the right connecting portion 33 has a smaller diameter than the left connecting portion 33 a, and the left connecting portion 33 a of another casing rod 11 adjacent to the right connecting portion 33 is fitted to the casing rod. 11 connections are made. For this connection, a nut 36 is embedded in the connection hole in the right connection portion 33, and two bolts are screwed together by screwing bolts from the connection portion 33 a of the other casing rod 11 fitted to the connection portion 33. The casing rod 11 is connected.

  The main body 31 of the casing rod 11 has a double structure including an outer pipe 37 and an inner pipe 38 inside the outer pipe 37. A gap 39 is formed between the outer pipe 37 and the inner pipe 38 so that the pipes 37 and 38 are assembled with a space therebetween. In addition to this, the intermediate member 41 is assembled to the main body 31. The intermediate member 41 is provided inside the inner pipe 38 in the form of ribs with a predetermined interval, and is welded between the inner pipe 38 and the outer pipe 37. Thus, the casing rod 11 can be reduced in weight by forming the main body part 31 by the inner pipe 38 and the outer pipe 37 which are spaced apart from each other. Even in such a lightweight structure, the inner pipe 38 and the outer pipe 37 are assembled by the intermediate member 41, so that the strength can be maintained, and the casing rod 11 has a high torque without being thickened. It becomes possible to cope with high thrust.

  Next, excavation of collapsible earth and sand will be described with reference to FIGS. In these drawings, reference numeral 51 denotes a tunnel excavated in the horizontal direction with respect to the ground (ground) 52. Reference numerals 53, 54, and 55 in the drawings denote collapsed earth and sand that have collapsed when the tunnel 51 is excavated or after completion of the excavation, and the tunnel 51 is blocked by the collapsed earth and sand 53, 54, and 55. The double-pipe horizontal excavator 1 is driven by the crawler 3 by the traveling power unit 7 and travels to the site of the landslide 53, 54, 55, and stops just before the landslide 53, 54, 55 and excavates by the double pipe. I do.

  FIG. 12 shows a case where the collapsed sediment 53 is sand and gravel-mixed soil, the first drill head 5 holds the casing rod 11, and the second drill head 6 holds the excavating rod 12 inserted into the casing rod 11. As the excavation rod 12, an excavation rod having an auger bit 22 at the tip of an auger rod 21 is used as shown in FIG. 8. Then, as shown in FIG. 12A, the fallen earth and sand 53 is excavated in advance by the auger rod 21, and the fallen earth and sand 53 is excavated horizontally by the encircling excavation of the casing rod 11. These excavations are driven by driving the first drill head 5 and the second drill head 6 with hydraulic pressure from the main power unit 9. The excavation is continued while the casing rod 11 and the excavation rod 12 are added.

  FIG. 12 (B) shows a state in which the fallen earth and sand 53 have been penetrated. Both the excavation rod 12 and the casing rod 11 pass through the fallen earth and sand 53 and the tip portion reaches the accident pit. Thereafter, as shown in FIG. 12C, only the excavating rod 12 is pulled out, and only the casing rod 11 is left in the collapsed earth and sand 53. Moreover, after pulling out the excavation rod 12, the double pipe horizontal excavator 1 travels backward and enters a standby state. Thereby, only the casing rod 11 which penetrated the collapsible earth and sand 53 remains in the collapsible earth and sand 53, and becomes a communicating hole to an accident mine. Persons left behind in the accident mine can escape from the accident mine by using the inside of the casing rod 11 as a passage. In order to enable movement of the personnel in the casing rod 11 as described above, it is preferable to use a casing rod 11 having a diameter of 600 to 900 mm. This diameter is the same in the excavation of FIGS. 13 and 14.

  FIG. 13 shows a case where the collapsible sediment 54 is a gravel mixed earth and sand. As the excavation rod 12 inserted into the casing rod 11, an excavation rod in which an air hammer 23 is connected to the tip of the auger rod 21 shown in FIG. Is used. Since the air hammer 23 applies a striking force to the drill bit 25 having a fixed excavation diameter at the tip, the drill bit 25 can excavate while destroying gravel and rolling stones mixed in the fallen earth and sand 54. 13 is the same as FIG. 12. As shown in FIG. 13A, the collapsed earth and sand 54 is preliminarily excavated by the air hammer 23 and the drill bit 25, and the collapsed ground 54 is horizontally leveled by the excavation of the casing rod 11. Drilling into. The excavation is performed by driving the first drill head 5 and the second drill head 6 with hydraulic pressure from the main power unit 9. Further, excavation is continued while the auger rod 21 and the casing rod 11 are added.

  FIG. 13B shows a state in which both the excavating rod 12 and the casing rod 11 have penetrated the collapsible earth and sand 54 and the tip portion has reached the accident pit. Thereafter, as shown in FIG. The double pipe horizontal excavator 1 moves backward and stands by while only pulling out only and leaving only the casing rod 11 in the collapsed earth and sand 54. Thereby, personnel such as workers left in the accident pit can escape by moving inside the casing rod 11 as a passage.

  FIG. 14 shows a case where the collapsible earth and sand 55 is earth and sand including a boulder layer and bedrock, and the excavating rod 12 inserted into the casing rod 11 is an air having an expansion / contraction bit 28 as shown in FIG. A hammer 27 connected to the auger rod 21 is used. The air hammer 27 applies a striking force to the expansion / contraction bit 28, and in addition to this, the expansion / contraction bit 28 is pressed against the earth and sand to expand the diameter. For this reason, it is possible to excavate while crushing boulders and rocks. In this excavation, the expansion / contraction bit 28 has a diameter larger than that of the casing rod 11 and is excavated in advance. For this reason, the casing rod 11 is smoothly carried. 14 is the same as FIG. 12, and as shown in FIG. 14 (A), the collapsed sediment 55 is excavated by the air hammer 27 and the expansion / contraction bit 28, and the casing rod 11 is excavated. The excavation is performed by driving the first drill head 5 and the second drill head 6 with hydraulic pressure from the main power unit 9. Further, excavation is continued while the auger rod 21 and the casing rod 11 are added.

  FIG. 14B shows a state in which both the excavation rod 12 and the casing rod 11 have penetrated the collapsible earth and sand 55 and the tip portion has reached the accident pit. Thereafter, as shown in FIG. Only the casing rod 11 is left in the collapsed earth and sand 55, and the double pipe horizontal excavator 1 moves backward and stands by. Thereby, personnel such as workers left in the accident pit can escape by moving inside the casing rod 11 as a passage.

  FIGS. 15A and 15B show a structure for expanding / contracting the excavation diameter of the expansion / contraction bit 28 shown in FIG. 10. The expansion / contraction bit 28 includes a bit body 61 connected to the tip of the air hammer 27 and a plurality (three) of slide bits 62 attached in the circumferential direction of the bit body 61 in an equally divided state. The attachment surface 63 of the bit body 61 to which the slide bit 62 is attached is a tapered surface inclined toward the axial center direction, and the opposing surface 66 of the slide bit 62 corresponding to the attachment surface 63 is inclined in the same direction. It is a surface. By sliding along the mounting surface 63 of the bit body 61, the slide bit 62 moves in the radial direction, and the expansion / contraction bit 28 expands / contracts. The diameter of the expansion / contraction bit 28 is increased when the slide bit 62 slides along the attachment surface 63 and moves radially outward by a reaction force pressed against the collapsed earth and sand. On the other hand, the diameter of the expansion / contraction bit 28 is reduced by moving the bit body 61 in the anti-excavation direction via the air hammer 27 by pulling the auger rod 21 in a direction away from the collapsed earth and sand (anti-excavation direction). In this movement, since the base end face 64 of the slide bit 62 abuts on the front end face 65 (see FIG. 10) of the casing rod 11 and the movement of the slide bit 62 is restricted, the slide bit 62 has a diameter relative to the bit body 61. It moves relatively inward, and the expansion / contraction bit 28 is reduced in diameter by this relative movement. In FIG. 15A, reference numeral 67 denotes a locking pin for the bit body 61, and reference numeral 68 denotes a locking slit into which the locking pin 67 is slidably inserted. The slide bit 62 from the bit body 61 at the time of expansion / contraction is shown in FIG. Make sure to stop.

  In the above embodiment, excavation is performed by selecting and exchanging excavation rods according to the soil quality of the collapsible sediment, so excavation corresponding to the soil quality of the collapsible sediment can be performed. For this reason, a quick excavation speed can be maintained, and quick relief of personnel becomes possible.

  The excavation shown in FIGS. 12 to 14 is performed by driving the first drill head 5 and the second drill head 6 by the hydraulic pressure from the main power unit 9, but when the main power unit 9 is down, the excavation is performed. The excavation is continued by switching to the power unit 7 and driving the first drill head 5 and the second drill head 6 by the hydraulic pressure from the traveling power unit 7. By switching to the traveling power unit 7 in this way, excavation can be continued without waiting for the repair or replacement of the main power unit 9. Therefore, early life saving can be performed.

DESCRIPTION OF SYMBOLS 1 Double pipe horizontal excavator 2 Excavator main body 5 1st drill head 6 2nd drill head 7 Traveling power unit 9 Main power unit 11 Casing rod 12 Excavation rods 53, 54, 55, 120 Collapsed sand 130 Capsule (moving body)
150 trolley (mobile)

Claims (3)

The fallen sand is drilled horizontally by a double pipe with a drill rod inserted into the casing rod to penetrate the fallen sand, and the drill rod is pulled out of the casing rod while remaining in the fallen sand, and the casing is removed. It is a relief method from a collapse accident with the inside of the rod as a passage for personnel,
One of the following rods selected from the following (1) to (3) is replaced as the excavating rod according to the soil quality of the collapsed earth and sand, and a relief method from a collapse accident.
(1) An auger rod having an auger bit at the tip (2) An auger rod connected to the tip of an air hammer having a fixed digging diameter (3) An auger rod connected to the tip of an air hammer capable of expanding or reducing the digging diameter A method for relieving a collapse accident according to claim 1,
A method for relieving a collapse accident, characterized in that a movable body on which the personnel can board is reciprocated inside a casing rod remaining in the collapsed earth and sand. A first drill head that holds and rotates the casing rod and a second drill head that holds and rotates the excavating rod inserted into the casing rod are attached to the excavator body, and the first drill head and the second drill The head is driven by the hydraulic pressure of the main power unit and the fallen sand is excavated horizontally by the double pipe comprising the casing rod and the excavating rod, and the excavator body travels on the ground by the driving force of the traveling power unit. A heavy pipe horizontal excavator,
One drilling rod selected from a plurality of the following (1) to (3) can be exchanged for the second drill head, and the traveling power unit can be exchanged with the main power unit. A double-pipe horizontal excavator used for a relief method from a collapse accident, characterized in that the switching power supply to the head and the second drill head can be switched.
(1) An auger rod having an auger bit at the tip (2) An auger rod connected to the tip of an air hammer having a fixed digging diameter (3) An auger rod connected to the tip of an air hammer capable of expanding or reducing the digging diameter

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