JP6621671B2 - Soil removal adapter, drilling device and soil recovery system - Google Patents

Description

  The present invention provides a steel reinforcing material such as a reinforcing bar and a steel pipe while drilling a natural ground, and then injects a grout material such as cement milk and cement mortar under pressure, for example, a ground such as a small-diameter steel pipe pile method. The present invention relates to a soil removal adapter used in a hole drilling device used in a reinforcement method, a hole drilling device equipped with a soil removal adapter, and a soil recovery system.

  A small diameter called micropile construction method as a ground reinforcement method under limited space and narrow space, such as inside of a tunnel, such as a countermeasure for collapse of steep slopes along mountain roads and a foundation support for lightweight embankments in mountainous areas. Steel pipe pile method is widely adopted. Small-diameter steel pipe pile is a general term for punched piles and embedded piles with a drilling diameter of φ300 mm or less. The small-diameter steel pipe pile construction method is a grout material after piercing steel reinforcements such as reinforcing bars and steel pipes while excavating natural ground. Cement milk or cement mortar is injected under pressure to form a synthetic pile formed of a steel pipe and a grout material up to the underground support layer (see Patent Document 1 and Patent Document 2).

  In the small-diameter steel pipe pile method, the air hose connected to the compressor is connected to the drifter, and the air from the compressor is transferred to the down-the-hole hammer via the flow path (inner pipe) in the inter-rod connected to the down-the-hole hammer for excavation. The upper end of the steel pipe through the space between the installed steel pipe (outer pipe) and the inter rod, drilling dust such as dust and earth and sand (hereinafter referred to as drilling gap) generated during drilling with the down-the-hole hammer This is done by using a dry double pipe method for discharging from the section.

Japanese Patent No. 2592079 Japanese Patent No. 5695307

  In the case of using the above-described dry double pipe system, the drilling slot is pushed up together with the air that has been sent in and scattered into the atmosphere from the opening at the upper end of the steel pipe. Therefore, problems such as remarkably deteriorating the working environment and the surrounding environment occur due to the drilling holes being scattered in the atmosphere. Therefore, a steel-shaped umbrella is attached to the drifter, and the periphery of the drifter and the steel pipe to be installed is shielded with a vinyl sheet attached to the umbrella, or the entire guide cell is shielded with a vinyl sheet, etc. Measures are taken to prevent splashing. However, when a new interrod and steel pipe are connected, it is necessary to work away from the vinyl sheet. Therefore, the drilling holes ejected from the upper end of the cast steel pipe are scattered around the work site. Will end up. Moreover, performing the operation | work which connects an interrod and a steel pipe, avoiding a vinyl sheet leads to the fall of work efficiency and the safety | security of work.

  The present invention provides a soil removal adapter, a hole drilling device, and a soil removal recovery system capable of preventing deterioration of the working environment and the surrounding environment by collecting the hole drilling slip without being scattered in the atmosphere. It is in.

  In order to solve the above-described problems, the earth removal adapter according to the present invention includes a cylindrical adapter main body fixed to the drifter in a state of surrounding the drifter rod, and a drilling hole that is scattered by air that is fed during drilling. It has a cylindrical shape having a discharge part on the outer peripheral surface for discharging dust, and with the adapter body inserted, the first position where the other end of the steel pipe is inserted and the other end of the steel pipe are released. And a cover movable between the second position and the second position.

  The cover preferably closes the space near the other end of the drift rod and the steel pipe when the cover moves from the second position to the first position.

  In this case, it is preferable that a drive unit that moves the cover between the first position and the second position is provided. In this case, it is preferable that the drive means is a hydraulic cylinder disposed between the drifter and the cover.

  The adapter body has a first fitting member fitted into the cover, and the first fitting member is formed on the inner peripheral surface of the cover when the adapter body is fitted into the cover. The outer peripheral surface has a ring that is pressed and elastically deformed.

  Moreover, it is preferable to have a second fitting member that is detachably attached to the other end of the steel pipe and is fitted into the cover when the cover is moved from the second position to the first position. In this case, it is preferable that the second insertion member has a ring on the outer peripheral surface that is elastically deformed by being pressed by the inner peripheral surface of the cover when the second insertion member is inserted into the cover moved to the first position. .

  The drilling device of the present invention includes a guide cell, a drifter that is slidably disposed on the guide cell, a centizer that holds a steel pipe that is driven when drilling, and the soil removal adapter described above. And.

  In addition, the soil removal recovery system of the present invention includes the hole drilling device described above, a suction unit connected to the discharge part of the cover via a hose, the suction unit and the hose, and the suction unit A separation device that separates the hole-drilling dust and the air that are fed in, and a collection bag that collects the hole-drilled dust separated by the separation device.

  According to the present invention, it is possible to prevent the working environment and the surrounding environment from deteriorating by collecting the drilling slot without scattering into the atmosphere.

It is a side view which shows an example of the hole drilling apparatus of this embodiment. It is a perspective view which shows the structure of the vicinity of a drifter and a centizer. (A) is sectional drawing of the earthing adapter just before making the fitting member provided in the steel pipe fit in the earthing adapter, (b) shows the state by which the fitting member provided in the steel pipe was inserted in the earthing adapter. It is sectional drawing of the adapter for earth removal. It is sectional drawing which shows the state by which the steel pipe was hold | maintained at the centrizer. It is a perspective view which shows the state by which the insertion member of the upper end part of the steel pipe was inserted by the cover of the adapter for earth removal. It is a figure which shows an example of the soil removal collection | recovery system at the time of performing excavation work using a drilling apparatus.

  Hereinafter, the hole drilling apparatus of this embodiment is demonstrated using FIG. The hole drilling device 10 of the present embodiment is a device that performs excavation using a dry double pipe method using a down-the-hole hammer. The hole drilling device 10 includes a traveling carriage 11, a rotating ring slide base 12, a guide cell 13, a drifter 14, and a centizer 15. In the present embodiment, an example of a tracked vehicle type traveling vehicle is given as the traveling vehicle 11, but a wheeled vehicle type traveling vehicle may be used. Reference numerals 16 and 17 are outriggers that stabilize the posture of the traveling carriage 11 during construction. Reference numeral 18 denotes an operation unit that is operated when each part of the hole drilling device 10 is driven.

  The rotating ring slide base 12 includes a base portion 25 on which a support rod 21 and a hydraulic cylinder 22 supported by the traveling carriage 11 are supported, and a rotating ring portion 26 that is rotatable with respect to the base portion. The base portion 25 is pivotally supported by the support rod 21 and the hydraulic cylinder 22 supported by the traveling carriage 11, so that the support rod 21 is rotated by the hydraulic cylinder 23 and tilted by the hydraulic cylinder 22.

  The rotating ring portion 26 rotates with respect to the base portion 25 by driving the hydraulic cylinder 27. The rotating ring portion 26 is engaged with a rear guide portion 32 provided in the guide cell 13, so that the relative position between the rotating ring portion 26 and the guide cell 13 can be changed. Further, the rotating ring portion 26 has a hydraulic cylinder 28 connected to the upper end portion of the guide cell 13. By providing the hydraulic cylinder 28, the relative position between the rotating ring portion 26 and the guide cell 13 changes. For example, when the guide cell 13 is standing upright with respect to the ground surface, the guide cell 13 moves up and down with respect to the rotating ring slide base 12 by driving the hydraulic cylinder 28.

  As shown in FIG. 2, the guide cell 13 includes a guide portion (hereinafter referred to as a front guide portion) 31 including guide pieces 31 a and 31 b with which the engagement grooves 42 and 43 of the holding frame 41 of the drifter 14 are engaged. The rotary ring slide base 21 has a guide portion (hereinafter referred to as a rear guide portion) 32 including guide pieces 32a and 32b with which the rotary ring portion 26 is engaged. The guide cell 13 has a slide mechanism (not shown) that slides the drifter 14 along the longitudinal direction of the guide cell 13 (Z direction in FIG. 2). In addition, as a slide mechanism, the mechanism comprised from the chain, the sprocket, the motor, etc. is mentioned.

  As is well known, the drifter 14 has, for example, a shank rod 40 that is rotationally driven by a hydraulic motor, and the upper end of the shank rod 40 is hit by a hammer (not shown) that is driven by hydraulic pressure or air pressure. Thereby, rotation can be given to the inner rod connected with the shank rod 40, and striking force can be given to the steel pipe to be laid. The drifter 14 is disposed in the guide cell 13 via the holding frame 41. The holding frame 41 has engaging grooves 42 and 43 extending in the vertical direction (Z direction in FIG. 2) at both ends in the width direction (Y direction in FIG. 2) of the back surface. The engagement groove 42 inserts the guide piece 31a of the front guide portion 31, and the engagement groove 43 inserts the guide piece 31b of the front guide portion 31. Thereby, the direction in which the drifter 14 slides is restricted to the longitudinal direction of the guide cell 13.

  The centralizer 15 is fixed to the lower end portion of the guide cell 13. The centralizer 15 grips the rod clamp 45 that holds the steel pipe 70 to be driven, the screw joint of the steel pipe 70 held by the rod clamp 45 and the screw joint of the inner rod 72 that is connected to the bit, and these screws. A rod breaker 46 for loosening the joint and a holding frame 47 for holding the rod clamp 45 and the rod breaker 46 are provided. Reference numerals 48 and 49 denote hydraulic cylinders that project an inner piece (not shown) toward the steel pipe 70 when the steel pipe 70 is gripped by the rod clamp 45. Reference numerals 50 and 51 denote hydraulic cylinders that project an inner piece (not shown) toward the steel pipe 70 when the rod breaker 46 grips the screw joint of the steel pipe 70.

  The above-described drifter 14 is provided with a soil removal adapter 55 and a hydraulic cylinder 56 that raises and lowers the cover 58 of the soil removal adapter 55. As shown in FIGS. 3A and 3B, the soil removal adapter 55 has an adapter body 57 disposed in a state of surrounding the shank rod 40 provided on the drifter 14, and the adapter body 57. And a cover 58 into which a fitting member 71 fixed to the upper end portion of the steel pipe 70 is fitted. The adapter main body 57 is a cylindrical member having both ends opened. The adapter main body 57 has a flange portion 57a for fixing the adapter main body 57 to the drifter 14 at the upper end portion and an insertion member 59 to be fitted into the cover 58 at the lower end portion. The fitting member 59 is a cylindrical member whose outer diameter is larger than the outer diameter of the adapter main body 57. The fitting member 59 has two groove portions 59a and 59b over the entire circumference of the outer peripheral surface. These grooves 59a and 59b are provided with elastically deformable rings 60 and 61 having a circular cross section. The maximum diameters of the rings 60 and 61 disposed in the groove portions 59 a and 59 b are set larger than the inner diameter of the cover 58. When the fitting member 59 is fitted into the cover 58, the rings 60 and 61 are elastically deformed by being pressed against the inner peripheral surface of the cover 58, and hold between the adapter main body 57 and the cover 58 in an airtight manner.

  The cover 58 is a cylindrical member that is open at both ends, similarly to the adapter main body 57. The inner diameter of the cover 58 is set to be slightly larger than the outer diameter of the fitting member 59 provided on the adapter main body 57 and the fitting member 71 fixed to the upper end portion of the steel pipe 70. The cover 58 has a cylindrical discharge portion 62 that protrudes from the outer peripheral surface of the cover 58. The discharge part 62 discharges the drilling gap which scatters from the opening part of the upper end part of the steel pipe 70, and piping, such as a hose, is fixed to the discharge part 62, for example.

  The hydraulic cylinder 56 is a member that moves the cover 58 of the soil removal adapter 55 to change the relative position between the cover 58 and the adapter main body 57. The hydraulic cylinder 56 is disposed on the drifter 14 via a bracket 65. A holding member 65 that detachably holds the cover 58 of the soil removal adapter 55 is attached to the hydraulic cylinder 56.

  A fitting member 71 fixed to the upper end portion of the steel pipe 70 to be placed is fitted into the cover 58 of the above-described soil removal adapter 55. The fitting member 71 is a cylindrical member provided with an insertion port 71a on the upper surface. The inner diameter of the insertion port 71a is smaller than the inner diameter at the end on the insertion port 71a side of the insertion part 70b for inserting the steel pipe 70 from the other end side of the fitting member 71. Therefore, when the fitting member 71 is fixed to the steel pipe 70, the upper end portion of the steel pipe 70 is in contact with the stepped surface 71c generated by the inner diameter difference between the insertion port 71a and the insertion portion 70b.

  The fitting member 71 has a fitting portion 71 c that is fitted into the cover 58 at one end. The outer diameter of the fitting portion 71 c is larger than the outer diameter of the other end portion of the fitting member 71. Further, the outer diameter of the fitting portion 71 c is slightly smaller than the inner diameter of the cover 58. In FIG. 3, the fitting member 71 whose outer diameter of the fitting portion 71 c is larger than the outer diameter of the other end portion is taken as an example, but a fitting member having a constant outer diameter may be used.

  The insertion port 71 provided in the fitting member 71 functions as an opening for discharging the drilling slot that is inserted into the steel pipe 70 and into which the inner rod 72 inserted into the pipe 70 is raised. Further, the fitting portion 71c is provided with groove portions 71d and 71e over the entire outer peripheral surface. The grooves 71d and 71e are provided with rings 72 and 73 having a circular cross section and capable of elastic deformation. When the fitting member 71 is inserted into the cover 58, the rings 72 and 73 disposed in the grooves 71 d and 71 e of the fitting member 71 are elastically deformed by the inner peripheral surface of the cover 58, so that the fitting member 71 and the cover 58 Keep the space tight.

  Next, a case where the soil removal adapter 55 is used during excavation will be described with reference to FIGS. 4 and 5. First, the adapter main body 57 of the soil removal adapter 55 is fixed to the lower surface of the drifter 14. The cover 58 of the soil removal adapter 55 is fitted with a fitting member 59 fixed to the adapter main body 57 fixed to the lower surface of the drifter 14 from the upper end of the cover 58. When the fitting member 59 fixed to the adapter main body 57 is fitted into the upper end portion of the cover 58, the rings 60, 61 disposed in the groove portions 59a, 59b of the fitting member 59 are pressed against the inner peripheral surface of the cover 58, It is in an elastically deformed state. In this state, the cover 58 is attached to the holding member 65 attached to the hydraulic cylinder 56.

  On the other hand, the fitting member 71 is fixed to the upper end portion of the steel pipe 70 to be driven. After the fitting member 71 is attached to the upper end portion of the steel pipe 70, the steel pipe 70 is set on the centizer 15. After setting the steel pipe 70 to the centizer 15, the hydraulic cylinder 56 is driven. By driving the hydraulic cylinder 56, the cover 58 is lowered along the longitudinal direction (Z direction in FIG. 4) of the adapter main body 57. At this time, the rings 60 and 61 disposed in the grooves 59a and 59b of the fitting member 59 are pressed against the inner peripheral surface of the cover 58 and elastically deformed, and the inner periphery of the cover 58 descending is maintained. It is in sliding contact with the surface.

  By the lowering of the cover 58, the fitting member 71 fixed to the upper end portion of the steel pipe 70 set in the centizer 15 is fitted into the cover 58 from the lower end portion of the cover 58. When the fitting member 71 is inserted into the cover 58 from the lower end portion of the cover 58, the rings 72 and 73 disposed in the groove portions 71d and 71e of the fitting portion 71c of the fitting member 71 are pressed against the inner peripheral surface of the cover 58. And is elastically deformed. When the lowering of the cover 58 is stopped, the shank rod 40 provided on the drifter 14 is engaged with the inner rod 72 disposed inside the steel pipe 70.

  When the drifter 14 is driven, the down-the-hole hammer provided at the tip of the inner rod 72 connected to the drifter 14 rotates to perform excavation. Further, during excavation, air from a compressor (not shown) connected to the drifter 14 is sent to the down-the-hole hammer via the flow path in the inter rod 72. As a result, the space between the steel pipe 70 and the inner rod 72 is raised by the air fed with the drilling gap generated during excavation.

  In this state, the space between the adapter main body 57 and the cover 58 is kept airtight by elastically deformed rings 60 and 61. At the same time, the space between the fitting member 71 and the cover 58 is kept airtight by elastically deformed rings 72 and 73.

  FIG. 6 shows an example of the soil collection system. As shown in FIG. 6, a hose 76 connected to a suction device 75 called a “jector” is attached to the discharge portion 62 provided in the cover 58. Therefore, when the drilling gap rises to the upper end of the steel pipe 70 and reaches the inside of the cover 58 of the soil removal adapter 55, the drilling gap is sucked from the discharge portion 62 of the cover 58 by the suction device 75. , 77 flows into a separation device 78 called a cyclone. When the drilling slip flows into the separating device 78, the drilling slip and air are separated by the vortex generated inside the separating device 78. The separated air is discharged to the outside from a discharge port 78a provided at the top of the separation device 78. The separated drilling gap is discharged into a soil discharge bag 79 from a discharge hopper (not shown) provided at the lower end of the separation device 78. In addition, a code | symbol is a pallet which accommodates the bag for earth removal.

  As described above, the space between the adapter main body 57 and the cover 58 is kept airtight by the rings 60 and 61 elastically deformed by the inner peripheral surface of the cover 58. At the same time, the space between the fitting member 59 and the cover 58 is kept airtight by the rings 72 and 73 elastically deformed by the inner peripheral surface of the cover 58. Therefore, the drilling gap generated during excavation is recovered without being scattered in the atmosphere.

  When attaching a new steel pipe to the cast steel pipe 70, the separating device 78 is stopped and the hydraulic cylinder 56 is driven. The cover 58 is raised by driving the hydraulic cylinder 56. On the other hand, since the steel pipe 70 is held by the centizer 15, the insertion of the insertion member 71 into the cover 58 is released when the cover 58 rises. After the cover 58 is raised, the drifter 14 is raised. The fitting member 71 fixed to the upper end portion of the steel pipe 70 set in the centizer 15 is removed from the steel pipe 70. On the other hand, the fitting member 71 is fixed to the upper end of the new steel pipe. After the new steel pipe is set on the centizer 15, the lower end of the new steel pipe is connected to the upper end of the cast steel pipe 70. After this work, the cover 58 of the soil removal adapter 55 provided on the drifter 14 is lowered again, and the upper end portion of the fitting member 71 fixed to the upper end portion of a new steel pipe is inserted.

  Therefore, when connecting the new steel pipe 70 to the cast steel pipe 70, it is only necessary to previously perform the process of fixing the fitting member 71 to the upper end portion of the new steel pipe. The work efficiency during installation can be improved. Moreover, the earthing adapter 55 can prevent the drilling gap discharged from the upper end portion of the steel pipe 70 from being scattered in the atmosphere, and can prevent the working environment and the surrounding environment from deteriorating.

  In addition, after the placement of the steel pipe 70 is completed, the soil removal adapter 55 fixed to the drifter 14 is removed in the order of the cover 58 and the adapter main body 57. The removed soil removal adapter 55 is individually washed.

  In the present embodiment, a drilling device that performs excavation using a dry double pipe method using a down-the-hole hammer is described, but a wet double pipe method that performs excavation while feeding water instead of feeding air is used. A drilling device may be used.

  In the present embodiment, a drilling device in which the centizer 15 is fixed to the guide cell 13 is described. However, a drilling device in which the centizer is slidable with respect to the guide cell may be used.

  In the present embodiment, the case where the fitting member 59 is fixed to one end of the adapter main body 57 is described, but the adapter main body 57 and the fitting member 59 may be integrated.

DESCRIPTION OF SYMBOLS 10 ... Drilling device, 55 ... Adapter for earth removal, 56 ... Hydraulic cylinder, 57 ... Adapter main body, 58 ... Cover, 59 ... Insertion member (1st insertion member), 60, 61, 72, 73 ... Ring, 62 ... Discharge part, 71 ... Insertion member (second insertion member), 75 ... Aspirator, 78 ... Separation device

Claims (9)

A cylindrical adapter body fixed to the drifter in a state of surrounding the drifter rod;
A cylindrical shape having a discharge portion on the outer peripheral surface for discharging drilling dust scattered by air fed during drilling, the first position where the other end of the steel pipe is inserted in a state where the adapter body is inserted; A cover movable between a second position where the fitting of the other end of the steel pipe is released,
A soil removal adapter characterized by comprising: In the adapter for earth removal according to claim 1,
A soil removal adapter that closes a space in the vicinity of the other end portion of the rod of the drifter and the steel pipe when moved from the second position to the first position. In the earth removal adapter according to claim 1 or claim 2,
A soil removal adapter comprising driving means for moving the cover between the first position and the second position. In the soil removal adapter according to claim 3,
The earthing adapter, wherein the driving means is a hydraulic cylinder disposed between the drifter and the cover. The adapter for earth removal according to any one of claims 1 to 4,
The adapter body has a first fitting member fitted into the cover,
The first insertion member has a ring on the outer peripheral surface that has a ring that is elastically deformed by being pressed against the inner peripheral surface of the cover when the adapter main body is inserted into the cover. The adapter for earth removal according to any one of claims 1 to 5,
The second pipe member is detachably attached to the other end of the steel pipe, and has a second fitting member fitted into the cover when the cover moves from the second position to the first position. Adapter. The soil removal adapter according to claim 6,
The second insertion member has a ring on its outer peripheral surface that is elastically deformed by being pressed by the inner peripheral surface of the cover when the second insertion member is inserted into the cover moved to the first position. Soil adapter. A guide cell,
A drifter slidably disposed on the guide cell;
A centriser that holds a steel pipe that is driven when drilling;
A soil removal adapter according to any one of claims 1 to 7,
A hole drilling device comprising: A drilling device according to claim 8,
A suction device connected via a hose to the discharge part of the cover;
A separation device that is connected to the suction device through a hose and separates the drilling dust and air sent by the suction device;
A collection bag for collecting the drilling dust separated by the separation device;
A soil recovery system characterized by comprising:

Images