JP6268667B2 - Ground excavation system using a boring machine - Google Patents

Description

  The present invention relates to a ground excavation system using a boring machine that is applied when a well for the purpose of observation, monitoring and the like is constructed on the ground, and the ground is contaminated with harmful substances.

  The ground is contaminated for various reasons. For example, when a ground tank storing harmful substances is damaged for some reason, the harmful substances leak from the ground tank and penetrate into the ground.

  In such a situation, the most concern is that harmful substances that have permeated the ground flow into the groundwater system and diffuse into the environment, as well as dealing with the contaminated ground.

  In such a case, it is necessary to plan and examine various measures to prevent diffusion while taking into consideration the surrounding conditions. To that end, it is necessary to properly grasp the contamination status of groundwater, and therefore construction of observation wells using a boring machine. Is indispensable.

  Boring machines are generally designed to cut the ground with a cutting bit placed at the lower end of the boring rod while applying a feeding force and rotational torque to the boring rod. By discharging the fluid from the hole formed in the cutting bit, the cutting waste is put on the drilling fluid and conveyed to the drilling fluid through the gap between the boring rod and the hole wall in this state, so that the cutting waste is grounded. To be discharged.

  Since such drilling fluid also serves to protect the hole wall in addition to conveying cutting waste, mud and fresh water are often used, but in situations where groundwater contamination has occurred, the drilling fluid flows into the groundwater and the groundwater The position rises and may lead to further diffusion of harmful substances.

  Therefore, in the above-described situation, it is desirable to adopt air drilling using compressed air as a drilling fluid instead of muddy water or fresh water.

  On the other hand, in air drilling, as described above, the air that is the drilling fluid further transports ground water to the ground as the cutting waste and in some cases, when applied to the ground where groundwater contamination occurs, the air that is the transport medium Therefore, it is necessary to take measures to prevent the diffusion of not only cutting waste and groundwater but also air into the environment.

"Boring Pocket Book (5th edition)", published by Ohm Co., Ltd., National Geological Survey Association Federation, published on September 20, 2013, 5th edition

  However, regardless of whether it is air drilling or not, it has not been assumed that harmful substances, especially gaseous harmful substances, will be discharged from the drilling holes when drilling by drilling, and appropriate measures can be taken. The current situation is not possible.

  For example, in hot spring drilling and geothermal drilling, “To prevent hot spring drilling safely, it is important to take measures against flammable gases that are expected to erupt during excavation. (Non-patent document 1, page 379), “Since geothermal drilling targets high-temperature and high-pressure steam and hot water, casing planning, muddy water management during drilling, and countermeasures against blowout are essential.” (Omitted) In addition, as described above, the installation of a large pump for cooling, a muddy water cooling tower, a mouth spray prevention device (blowout pre-bender), etc. as the ground equipment ”(see page 381), Although it is envisaged that toxic substances may be ejected, all of these measures immediately interrupt the excavation and then take measures to close the excavation hole by activating the mouth anti-explosion device. Ejection of the material is not only a means which can be taken precisely because not all the time.

  In other words, when toxic substances are continuously discharged in the form of gas from the beginning of excavation, it is difficult to adopt a mouth-prevention blower that presumes interruption of excavation work, and a new emission prevention measure is desired. It was rare.

  The present invention has been made in consideration of the above-described circumstances, and even when harmful substances are continuously discharged in the form of gas from the beginning of excavation, the harmful substances can be discharged and diffused without interrupting excavation. An object of the present invention is to provide a ground excavation system using a boring machine that can be prevented.

In order to achieve the above object, the ground excavation system using the boring machine according to the present invention is arranged at the lower end of the boring rod by rotating the boring rod around the material axis while moving forward as described in claim 1. together with excavated soil at the cutting bit to form a drill hole, and the said boring rods in a manner to put the drilling fluid discharged the cutting chips produced by the drilling from Do Ri said cutting bit from a gas such as compressed air In the ground excavation system using a boring machine that conveys to the ground surface opening of the excavation hole through an annular gap with the hole wall of the excavation hole,
A rod cover through which the boring rod is disposed so as to maintain hermeticity with the boring rod, and the rod cover is disposed by covering the ground surface opening of the excavation hole; The internal space of the rod cover is connected to the internal space of the rod cover in communication with the storage means, and the storage means is provided with an exhaust port for exhausting the gas. A trapping means capable of trapping harmful substances while allowing gas to pass is installed.

  In the ground excavation system using the boring machine according to the present invention, a forced exhaust means is provided at the exhaust port so that the internal space of the storage means has a negative pressure.

  Further, in the ground excavation system using the boring machine according to the present invention, the rod cover is configured so that liquid tightness with the boring rod is maintained, and the ring gap and the inner space of the rod cover are interposed. The storage means is configured so that the groundwater that has been transported can be stored in a state in which liquid tightness is maintained.

  In the ground excavation system using the boring machine according to the present invention, ground water storage means is connected to the storage means.

  Further, in the ground excavation system using the boring machine according to the present invention, a seal mechanism is provided in a portion of the rod cover through which the boring rod passes, and the boring rod is inserted through the seal mechanism. A hollow cylindrical body that is radially expandable by compressive loading in the axial direction of the material, a cylindrical casing formed with a shoulder for receiving the lower outer periphery of the plug, and an upper peripheral edge of the cylindrical casing The pressurizing member is provided with a loading portion projectingly provided so that a compression force can be loaded on the plug body by a rotation operation around the material axis.

  Further, in the ground excavation system using the boring machine according to the present invention, a rolling mechanism or a sliding material is provided between the upper surface of the plug body and the load portion described above and between the lower surface of the plug body and the shoulder portion. While being interposed, a friction reducing material is provided on at least one of the outer peripheral surface of the plug and the inner peripheral surface of the cylindrical casing.

  Further, the ground excavation system using the boring machine according to the present invention is provided with a rotation driving means capable of rotating the pressurizing member while installing a radiation measuring instrument in the vicinity of the seal mechanism and outside the rod cover. It is connected to the pressure member.

  Further, the ground excavation system using the boring machine according to the present invention includes a monitoring camera or a water level meter in which the storage means or the groundwater is transmitted in a form in which video data from the monitoring camera or water level data from the water level meter can be transmitted to the outside. It is installed in the storage means.

  In the ground excavation system using the boring machine according to the present invention, the rotation driving means is operated by remote control.

In the ground excavation system using the boring machine according to the present invention, as in conventional air drilling , the ground is excavated with a cutting bit arranged at the lower end of the boring rod by rotating the boring rod around the material axis while moving forward. as well as, of該掘drilling through the annular gap the cutting chips in a manner to put the discharged drilling fluid from Do Ri said cutting bit from a gas such as compressed air and the boring rod and the hole wall of the borehole produced by the excavation Unlike conventional air drilling, which pumps to the ground surface opening but releases the drilling fluid as it is to the atmosphere, in the present invention, the rod cover is disposed through the boring rod so as to maintain airtightness with the boring rod. The rod cover is disposed so that the ground surface opening of the excavation hole is covered, and the internal space is communicated with the annular gap. Rutotomoni is communicatively connected to the storage means an internal space of the rod cover.

  In this way, the gas that has been pumped to the ground surface opening of the excavation hole through the annular gap is transferred to the storage means together with the cutting waste, and harmful substances are captured by the capture means installed at the exhaust port of the storage means. After that, it is discharged to the atmosphere through the exhaust port.

  On the other hand, the cutting waste is stored as it is in the storage means.

  Therefore, even if the ground to be excavated is contaminated with harmful substances, especially radioactive substances, and the radioactive substances are included in the drilling fluid or cutting waste, it is discharged from the ground surface opening of the drilling hole, Without interrupting excavation work, it is possible to prevent the discharge of harmful substances such as radioactive substances and the diffusion to the atmosphere.

  In addition, the storage means in which a predetermined amount of cutting waste is stored should be transferred to an appropriate storage location after the exhaust port is properly sealed, and a new storage means is newly installed and connected to the rod cover. Good.

  Although the excavation hole excavated by the present invention is mainly assumed to be used as an observation well for monitoring the contamination status of groundwater, its use is arbitrary, and instead of the observation well, for example, a water stop wall It may be used for construction.

  The boring machine may be appropriately selected from those capable of air drilling. For example, a boring machine equipped with a down-the-hole hammer can be used. In the case of air drilling, since the hole wall cannot be protected, a hole retaining casing may be appropriately used if necessary.

  The drilling fluid is typically composed of compressed air, but in some cases it may be composed of chemically stable and less reactive nitrogen gas.

  Here, since the drilling fluid is discharged from the cutting bit at a predetermined pressure, after being discharged from the ground surface opening of the drilling hole, it is pumped into the storage means through the internal space of the rod cover, and further the exhaust of the storage means Although it can be expected that the exhaust is smoothly discharged from the mouth, when the forced exhaust means is provided at the exhaust outlet so that the internal space of the storage means becomes negative pressure, the flow of the drilling fluid along the above-mentioned path is smooth. Thus, there is no concern that harmful substances contained in the drilling fluid or the cutting waste conveyed by the drilling fluid will remain attached to the inner surface of the rod cover or the storage means.

  The trapping means may be appropriately selected according to the type of harmful substance. When the harmful substance is a radioactive substance, zeolite, HEPA filter, bag filter, activated carbon, cesium adsorbent (Cs-HOM), Prussian blue particle adsorbent , WAC filter or the like.

  When performing ground excavation using a boring machine, it may be possible to prevent groundwater from being pumped during excavation by using a groundwater level lowering method, but when groundwater is discharged from the ground opening of the excavation hole together with cutting waste. The groundwater is likely to contain harmful substances.

  In that case, the rod cover is configured so that the liquid tightness with the boring rod is maintained, and the groundwater transported through the annular gap and the internal space of the rod cover is kept liquid tight. What is necessary is just to comprise a storage means so that water can be stored.

  Here, the cutting waste and groundwater may be mixed and stored in the storage means. However, if the groundwater storage means is connected to the storage means, the cutting waste and groundwater can be stored separately. The subsequent handling becomes easier.

  Similarly to the storage means described above, the groundwater storage means is transferred to an appropriate storage location after a predetermined amount of groundwater is stored, and a new groundwater storage means is newly installed and connected to the storage means. That's fine.

  When penetrating the boring rod through the rod cover, how to maintain airtightness at the penetrating portion or in addition to liquid tightness (hereinafter also referred to as a sealing function) is arbitrary, and is known using an O-ring or the like It is possible to configure as appropriate using the above-mentioned sealing technology. However, while providing a sealing mechanism at the above-mentioned penetrating part, the sealing mechanism is formed into a hollow cylindrical shape so that a boring rod can be inserted, and compressed in the axial direction of the material. A plug body that is expandable in the radial direction by loading, a cylindrical casing formed with a shoulder for receiving the lower outer periphery of the plug body, and a rotational operation around a material axis that is screwed to the upper peripheral edge of the cylindrical casing. If the plug body is composed of a pressure member provided with a loading portion capable of loading a compressive force, the plug body is expanded by compression loading, so that the outer peripheral surface of the plug body is a cylindrical case. The inner peripheral surface of the grayed, because the inner peripheral surface of the plug member can be respectively abutting the outer peripheral surface of the boring rod can be exhibited reliably sealing function in the through portion between the rod cover and the boring rod.

  Here, since the boring rod advances along the material axis direction and rotates around the material axis, the outer peripheral surface of the plug body is cylindrical when the plug body rotates together with the boring rod at the above-mentioned contact point. If the inner peripheral surface of the plug body slides in the material axis direction relative to the outer peripheral surface of the boring rod and the plug body does not rotate with the boring rod, the inner surface of the plug body The peripheral surface slides in the material axis direction and around the material axis with respect to the outer peripheral surface of the boring rod.

  Therefore, the material of the plug body may be appropriately determined so that the sealing function is ensured in the above-described sliding state. However, the outer peripheral surface of the boring rod may be unevenly formed due to repeated use. In many cases, irregularities are also formed at the joints between the boring rods, so there is a concern about wear deterioration due to sliding and a decrease in the sealing function resulting therefrom.

  In such a case, a rolling mechanism or a sliding material is interposed between the upper surface of the plug body and the loading portion and between the lower surface of the plug body and the shoulder portion, and the outer peripheral surface of the plug body and the inside of the cylindrical casing. It is preferable to provide a friction reducing material on at least one of the peripheral surfaces.

  In this way, since the plug body rotates together with the boring rod, it is possible to prevent the plug body and the boring rod from sliding around the material axis, and thus the wear deterioration between the plug body and the boring rod. It becomes easy to maintain a sealing function by extension.

  The pressurizing member constituting the seal mechanism may have an excessive contact pressure at the above-mentioned contact point, causing troubles in the rotation and advancement of the boring rod, or conversely becoming too small to lower the sealing function. It is only necessary to rotate the plug body appropriately according to the degree of wear of the plug body. However, the radiation measuring device is installed outside the rod cover in the vicinity of the seal mechanism, and the pressure member can be rotated. If the driving means is connected to the pressurizing member, when a leakage of radioactive material due to a decrease in the sealing function is detected, the sealing function is improved by quickly rotating the pressurizing member to increase the contact pressure at the contact point. Can be recovered quickly.

  The rotation driving means may be constituted by a hydraulic motor, for example.

  As described above, the storage means and the groundwater storage means are transferred to an appropriate storage location after a predetermined amount of cutting waste or groundwater is stored and stored. If the water level data from the water level gauge is installed in the storage means or the groundwater storage means in such a way that it can be transmitted to the outside, the timing of reaching the predetermined amount can be known without delay.

  Even if the cutting waste in the storage means is a single unit or mixed and stored with groundwater, it may be piled up directly under the input location and may not be stored until the planned amount is reached. If vibration imparting means is installed in the means, it is possible to monitor the accumulated height of the cutting waste in the storage means using video data from the surveillance camera. It becomes possible to store the cutting waste in a state where the top end of the steel plate is uniform, and thus it is possible to complete the storage of the cutting waste with a predetermined storage amount.

  The vibration applying means can be constituted by a vibrator used for concrete placing work.

  In the present invention, it is assumed that the ground to be excavated is contaminated with harmful substances, particularly radioactive substances, and there is a restriction on the time that workers can stay at the excavation site in relation to the exposure dose. .

  For this reason, it is desirable to perform as far as possible remote operations, such as driving operations when the boring machine is a self-propelled mobile body, drilling control operations of the boring machine, boring rod addition operations, and other operations necessary for ground excavation.

  Here, if the above-described rotation driving means or vibration applying means is operated by remote control, unexpected health damage due to deterioration of the sealing function can be prevented in advance, or a health risk is imposed on the worker. Therefore, the cutting waste storage efficiency can be maximized.

1 is an overall view of a ground excavation system 1 using a boring machine according to the present embodiment. The longitudinal cross-section detailed drawing which showed the rod cover 9 of the ground excavation system 1. FIG. The disassembled perspective view which showed the seal mechanism 20 of the ground excavation system 1. FIG. Schematic which showed the storage tank 10 and the water tank 11 of the ground excavation system 1. FIG. It is the figure which showed the mechanism which rotates the sealing mechanism 20b which concerns on the modification, and its pressurization member 38b, (a) is a longitudinal cross-sectional detail drawing, (b) is a block diagram in the case of performing remote operation. The block diagram in the case of operating remotely the top edge management of the cutting waste 56 in the storage tank 10 with the vibrator 64. FIG.

  Hereinafter, embodiments of a ground excavation system using a boring machine according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an overall view showing a ground excavation system using a boring machine according to the present embodiment. As can be seen in the figure, the ground excavation system 1 using the boring machine according to the present embodiment rotates the boring rod 2 around the material axis while moving it forward, so that the down-the-hole hammer 3 attached to the tip of the boring rod 3 The excavated ground 4 is excavated to form an excavation hole 5 and the cutting waste generated by excavation is placed on an excavation fluid made of compressed air via an annular gap 6 between the boring rod 2 and the hole wall of the excavation hole 5. Thus, the present invention is applied to a boring machine 8 adapted to convey to the ground surface opening 7 of the excavation hole 5.

  The ground excavation system 1 includes a rod cover 9 penetrating the boring rod so that airtightness and liquid tightness with the boring rod 2 are maintained. The rod cover has a ground surface opening 7 of the excavation hole 5. By arranging so as to be covered, the internal space communicates with the annular gap 6, and the storage tank 10 as the storage means is connected to the internal space of the rod cover, and further, the storage tank is used as the groundwater storage means. The water storage tank 11 is connected in communication.

  As can be clearly seen in FIG. 2, the rod cover 9 has a cylindrical body 21 formed so as to surround the boring rod 2 and a sealing mechanism installed above the cylindrical body with the boring rod 2 being penetrated. 20, and the bolted bottom plate 22 of the cylindrical body 21 is overlapped with the flanged flange 24 of the sleeve 23 fitted in the ground surface opening 7 of the drilling hole 5, and is bolted. In addition, an inner space 25 extending inside the cylindrical body 21 is communicated with an annular gap 6 between the boring rod 2 and the hole wall of the excavation hole 5.

  A suction hose 27 is connected to the cylindrical body 21 via an opening / closing valve 26, and the other end of the suction hose is connected to the storage tank 10, and the internal space 25 of the rod cover 9 is a storage tank. It communicates with 10 internal spaces.

  As can be clearly seen from the exploded perspective view of FIG. 3, the sealing mechanism 20 is disposed on the plug body 31 formed in a hollow cylindrical shape so that the boring rod 2 can be inserted, and on the upper surface side and the lower surface side of the plug body. An annular thrust bearing 32a, 32b as a rolling mechanism, and a cylindrical casing 34 formed with a shoulder 33 extending from the cylindrical body 21 and receiving the lower outer periphery of the plug body 31 through the thrust bearing 32b. An annular slit 39 into which the upper end of the cylindrical casing is inserted, and a female screw 36 into which a male screw 35 formed on the upper outer periphery of the cylindrical casing 34 is screwed onto the inner surface of the annular slit. And a pressurizing member 38 formed of

  The plug body 31 is configured to expand in the radial direction by compressive loading in the axial direction of the material. For example, nitrile rubber or polyurethane sold by NOK Corporation under the trade name of “Iron Rubber (registered trademark)” is used. Can be made of rubber.

  Handles 40, 40 for rotating the pressure member around the material axis are provided on the outer peripheral surface of the pressure member 38, and a loading portion 37 that is in contact with the thrust bearing 32a is provided with an annular slit. 39, which protrudes inwardly, and when the pressing member 38 is rotated around the material axis by the handles 40, 40, the female screw 36 formed on the pressing member 38 and the male member formed on the cylindrical casing 34. When the pressing member 38 is drawn to the cylindrical casing 34 by the screwing action with the screw 35, a compressive force is applied from the loading portion 37 to the upper surface of the plug body 31 through the thrust bearing 32a, and the cylinder through the thrust bearing 32b. A compressive force acts on the lower surface of the plug body 31 from the shoulder portion 33 of the cylindrical casing 34, and the plug body 31 expands in the radial direction by the compression force, and the outer peripheral surface 41 of the plug body has a cylindrical shape. The inner peripheral surface 43 of the plug 31 is in contact with the outer peripheral surface of the boring rod 2 on the inner peripheral surface 42 of the sing 34, so that the penetrating portion of the rod cover 9 through which the boring rod 2 penetrates and the airtightness between the boring rod Property and liquid tightness are maintained.

  Here, the outer peripheral surface 41 of the plug 31 and the inner peripheral surface 42 of the cylindrical casing 34 are made of friction reducing materials, for example, materials sold by DuPont under the trade name “Teflon (registered trademark)”, respectively. A film is formed, and slides on three surfaces except the inner peripheral surface 43 among the upper surface, the lower surface, the outer peripheral surface 41 and the inner peripheral surface 43 of the plug body 31 by the cooperative action with the thrust bearings 32a and 32b. By making it easy to do, the inner peripheral surface 43 of the plug body 31 is prevented from sliding with respect to the outer peripheral surface of the boring rod 2.

  As shown in FIG. 4, the storage tank 10 discharges the air that is the drilling fluid that has been pressure-fed through the suction hose 27 from the exhaust port 52, while the cutting that has been carried on the air that is the drilling fluid. While storing the waste 56, the ground water 57 can also be temporarily stored.

  The storage tank 10 has airtightness and liquid tightness except for the exhaust port 52 so that radioactive materials as harmful substances contained in the cutting waste 56, the groundwater 57 or air transporting them do not leak to the outside. It is configured to be held.

  The exhaust port 52 is provided with a filter 53 as a capturing means capable of capturing the radioactive substance contained in the air while allowing air as a drilling fluid to pass therethrough. An exhaust fan 54 is provided, and the exhaust fan 54 is operated to make the internal space 51 of the storage tank 10 have a negative pressure, and through the suction hose 27, the cutting waste 56, the groundwater 57 and the air conveying them are supplied. It can be sucked.

  The filter 53 may be appropriately selected from zeolite, HEPA filter, bag filter, activated carbon, cesium adsorbent (Cs-HOM), Prussian blue particle adsorbent, WAC filter, and the like.

  A drainage port 59 is provided below the side wall of the storage tank 10, and an overflow wall 58 is erected at a position facing the drainage port, and flows over the overflow wall to the drainage port 59 side. The underground water can be transferred to the water storage tank 11 through a drain hose 60 and a drain pump 61 connected to the drain port 59.

  The storage tank 10 is provided with a monitoring camera 62a on the lower surface of the top plate and a vibrator 64 as vibration imparting means on the inner surface of the side wall, and using the video data from the monitoring camera 62a, the cutting waste 56 in the storage tank 10 is stored. By monitoring the stacked height and actuating the vibrator 64 as needed, it is possible to store the cutting waste in a state where the top end of the cutting waste 56 is uniform, and to store the cutting waste using the above-mentioned video data. It is possible to judge whether the amount has been reached.

  In addition, a water level meter 63a is installed on the bottom surface of the top plate in the storage tank 10, and the water level of the ground water 57 in the storage tank 10 is monitored using the water level data obtained by the water level gauge, and a drain pump 61 is installed. By operating at any time, the ground water can be transferred to the water storage tank 11.

  Similar to the storage tank 10, the water storage tank 11 is provided with a monitoring camera 62b and a water level gauge 63b on the lower surface of the top plate, and the water level is obtained using video data from the monitoring camera 62b and water level data obtained by the water level gauge 63b. It is possible to monitor and judge whether the planned amount of water storage has been reached.

  In the ground excavation system 1 using the boring machine according to the present embodiment, the forward drive (feeding force) and the rotational drive (rotational torque) around the material axis are down-the-hole through the boring rod 2 as in the conventional air drilling. The ground 4 is excavated by generating an impact force from the down-the-hole hammer 3 with high pressure air from an air compressor (not shown) while acting on the hammer 3.

  Here, from the cutting bit provided at the tip of the down-the-hole hammer 3, high-pressure air from the air compressor is discharged as a drilling fluid, and the cutting waste generated in the drilling together with the groundwater if the depth is below the groundwater level. It flows through the annular gap 6 between the boring rod 2 and the hole wall of the excavation hole 5 while riding on the excavation fluid, and is pumped from the ground surface opening 7 of the excavation hole to the internal space 25 of the rod cover 9.

  Here, the sealing mechanism 20 is configured to maintain airtightness and liquid-tightness with respect to the boring rod 2 arranged in a penetrating manner, that is, the outer peripheral surface 41 of the plug 31 constituting the sealing mechanism 20 is The inner peripheral surface 43 of the plug 31 is in contact with the inner peripheral surface 42 of the cylindrical casing 34 and the boring rod 2, so that the air tightness and liquid tightness at the portion through which the boring rod 2 passes are maintained. It has become.

  Incidentally, the plug body 31 is provided with thrust bearings 32a and 32b on the upper surface side and the lower surface side, respectively, and a friction reducing material is provided on the outer peripheral surface 41 and the inner peripheral surface 42 of the cylindrical casing 34. Therefore, the plug 31 rotates together with the boring rod without sliding the inner peripheral surface thereof around the material axis with respect to the boring rod 2.

  It should be noted that the contact pressure at the above-mentioned contact point in the plug body 31 becomes excessive, causing troubles in the rotation and forward movement of the boring rod 2, or conversely, it becomes too small and the sealing function by the plug body 31 is lowered. In order to prevent this, the pressure member 38 is appropriately rotated according to the degree of wear of the plug 31 to adjust the degree of expansion of the plug 31 as appropriate.

  In this way, since the air tightness and liquid tightness of the rod cover 9 are surely exhibited in the portion through which the boring rod 2 penetrates, the cutting waste, the groundwater and the like that have been fed to the internal space 25 of the rod cover are conveyed. Combined with the suction action of the exhaust fan 54 provided in the storage tank 10, the air to be discharged does not leak out of the rod cover 9 and is stored via the suction hose 27 connected to the rod cover 10. To be pumped.

  Of the cutting waste, the groundwater and the air transporting them that have been pumped to the storage tank 10, the cutting waste 56 is stored in the storage tank 10 as it is, and the groundwater is also stored in the storage tank 10 as primary water. The air that has been conveyed is exhausted from the exhaust port 52 after the radioactive material contained in the air is captured by the filter 53.

  Here, while monitoring the pile height of the cutting waste 56 in the storage tank 10 with the monitoring camera 62a, the top end of the cutting waste 56 is maintained uniformly by operating the vibrator 64 appropriately, and the inside of the storage tank 10 The groundwater 57 is monitored by the water level gauge 63a, and the drainage pump 61 is appropriately operated to transfer the groundwater to the water tank 11, and the video data and water level obtained by the monitoring camera 62b on the water tank 11 side as well. The water level is monitored using the water level data obtained in the total 63b.

  And when it can be judged from the image | video by the monitoring camera 62a that the cutting waste 56 in the storage tank 10 has reached the scheduled storage amount, the excavation operation is temporarily stopped, the exhaust port 52 is sealed with the lid 55, and an appropriate one is obtained. While moving to a storage place, a new storage tank 10 is newly installed and connected to the rod cover 9 in communication.

  Similarly, if it can be determined that the groundwater has reached the planned storage volume from the video by the monitoring camera 62b or the water level data obtained by the water level gauge 63b, the excavation work is temporarily stopped and then moved to an appropriate storage location. At the same time, a new water tank 11 is newly installed and connected to the storage tank 10.

  As described above, according to the ground excavation system 1 using the boring machine according to the present embodiment, the rod cover 9 is provided penetratingly arranged in the boring rod so that the airtightness with the boring rod 2 is maintained. The rod cover is arranged so that the ground surface opening 7 of the excavation hole 5 is covered, so that the internal space 25 communicates with the annular gap 6 and the internal space 25 of the rod cover communicates with the storage tank 10. Since it was made to do so, the air pressure-fed through the annular gap 6 to the ground surface opening 7 of the excavation hole 5 was transferred to the storage tank 10 together with cutting waste and groundwater, and installed in the exhaust port 52 of the storage tank. After radioactive material is captured by the filter 53, it is released to the atmosphere through the exhaust port.

  Therefore, even when air, cutting waste or groundwater containing radioactive material is discharged from the ground surface opening 7 of the excavation hole 5, the radioactive material can be discharged or diffused into the atmosphere without interrupting the excavation work. Can be prevented in advance.

  Further, according to the ground excavation system 1 using the boring machine according to the present embodiment, since the exhaust fan 54 is provided at the exhaust port 52 of the storage tank 10, a negative pressure is formed in the storage tank 10. Thus, the suction action through the suction hose 27 is exhibited, and thus the cutting waste, the groundwater and the air transporting them can be smoothly flowed into the storage tank 10, and the radioactive substance is introduced into the rod cover 9 and the storage tank. It is possible to prevent leakage from 10 and adhesion to the inner surface of these.

  Moreover, according to the ground excavation system 1 using the boring machine according to the present embodiment, since the water storage tank 11 is connected to the storage tank 10, the cutting waste and the groundwater can be stored separately. Subsequent handling becomes easy.

  Further, according to the ground excavation system 1 using the boring machine according to the present embodiment, the sealing mechanism 20 is provided and the plug body 31 is expanded by compression loading, so that the outer peripheral surface 41 of the plug body 31 is cylindrical. The inner peripheral surface 43 of the plug body 31 can be brought into contact with the outer peripheral surface of the boring rod 2 on the inner peripheral surface 42 of the cylindrical casing 34, and as a result, it is ensured at the portion where the rod cover 9 and the boring rod 2 penetrate. The sealing function can be exhibited.

  In particular, the thrust bearings 32a and 32b are disposed on the upper surface side and the lower surface side of the plug body 31, respectively, and the friction reducing material is provided on the outer peripheral surface 41 and the inner peripheral surface 42 of the cylindrical casing 34. 2 is prevented from sliding around the material axis of the plug body 31, and thus even if the outer peripheral surface of the boring rod 2 is uneven, wear deterioration of the inner peripheral surface 43 of the plug body 31 is prevented. While suppressing, the fall of the sealing function resulting from it can be prevented beforehand.

  Moreover, according to the ground excavation system 1 using the boring machine according to the present embodiment, the monitoring camera 62a is installed in the storage tank 10, and the monitoring camera 62b and the water level gauge 63b are installed in the water storage tank 11, respectively. It becomes possible to know the timing when the amount is reached without delay.

  Moreover, according to the ground excavation system 1 using the boring machine according to the present embodiment, the vibrator 64 is installed in the storage tank 10, and therefore the cutting waste is stored in a state where the top ends of the cutting waste are uniform. Thus, it becomes possible to complete the storage of the cutting waste with the planned storage amount.

  In the present embodiment, it is assumed that groundwater is pumped together with the cutting waste from the annular gap 6 of the excavation hole 5, but if the groundwater is not pumped, the rod cover 9, the seal mechanism 20, and the storage tank 10 are provided. It is not necessary to configure so that liquid tightness is maintained, and the water storage tank 11 is also unnecessary.

  Further, even in a situation where groundwater is pumped up, it is not always necessary to separate and store cutting waste and groundwater, and the water storage tank 11 may be omitted, and they may be mixed and stored in the storage tank 10.

  Moreover, in this embodiment, although the exhaust fan 54 was provided in the exhaust port 52 of the storage tank 10, in order for an air compressor to have sufficient discharge capability, cutting waste, groundwater, and the air which conveys them are enough. As long as it can be press-fitted into the storage tank 10 with pressure, the exhaust fan 54 as the forced exhaust means may be omitted.

  Further, in the present embodiment, the sealing mechanism 20 is provided in the portion of the rod cover 9 through which the boring rod 2 passes, so that the air tightness and liquid tightness between the rod cover 9 and the boring rod 2 are ensured. However, the sealing mechanism provided in the portion through which the boring rod 2 passes does not need to be the sealing mechanism 20, and for example, if the unevenness on the outer peripheral surface of the boring rod 2 does not affect the sealing function, for example, an O-ring is used. The seal mechanism that was used may be used.

  In the present embodiment, thrust bearings 32 a and 32 b are disposed on the upper surface side and the lower surface side of the plug body 31, respectively, and a friction reducing material is provided on the outer peripheral surface 41 and the inner peripheral surface 42 of the cylindrical casing 34. However, even if the plug body 31 is in a sliding state, it can be adapted to the irregularities generated on the outer peripheral surface of the boring rod 2 due to its expansibility, and as a result, a thrust bearing can be provided. In addition to omitting 32 a and 32 b, it is not necessary to provide a friction reducing material on the outer peripheral surface 41 of the plug 31 and the inner peripheral surface 42 of the cylindrical casing 34.

  Moreover, in this embodiment, although the vibrator 64 was installed in the storage tank 10, if there is no fear that cutting waste will accumulate in the storage tank 10, even if the vibrator 64 which is a vibration provision means is abbreviate | omitted. It doesn't matter.

  Although not mentioned in the present embodiment, the handle is omitted and the gear 76 is wound around the peripheral surface as shown in FIG. The pressure member 38b is adopted, and a hydraulic motor 72 as a rotation driving means and a speed reducer 73 connected to the rotating shaft are built in the housing 71, and the housing is attached to the outer peripheral surface of the cylindrical casing 34. The gear 75 attached to the tip of the rotating shaft 74 extending from 73 may be configured to mesh with the gear 76.

  In such a configuration, the operation is not the manual rotation operation by the operator but the operation by the hydraulic motor 72.

  Here, as shown in FIG. 5 (a), a radiation measuring instrument 77 may be installed on the pressurizing member 38b as a position near the seal mechanism 20b in place of the pressurizing member 38 as a pressurizing member 38b. Good.

  In such a configuration, if the leakage of the radioactive substance from the sealing mechanism 20b is detected by reading the measurement value of the radiation measuring instrument 77, and the cause can be determined to be a decrease in the sealing function due to wear of the plug body 31, the hydraulic pressure By rotating the pressure member 38b by operating the motor 72, the plug body 31 is compressed and loaded in a radial direction, and the outer peripheral surface 41 of the plug body 31, the inner peripheral surface 42 of the cylindrical casing 34, and the plug The inner peripheral surface 43 of the body 31 and the outer peripheral surface of the boring rod 2 are reliably brought into contact with each other to restore the sealing function.

  FIG. 5B is a block diagram when the above-described operation is performed remotely. The measurement data wirelessly transmitted from the radiation measuring instrument 77 is received, for example, at the construction office side, and the received data is received by the construction work. While displaying as necessary on the display 83 of the personal computer 81 installed in the office, the arithmetic processing unit 82 configured by the personal computer performs arithmetic processing to compare with the threshold value, and the measured value exceeds the threshold value. If so, the pressure member 38 b is rotated by wirelessly driving the hydraulic motor 72 via the arithmetic processing unit 82.

  According to such a configuration, it is possible to safely recover the sealing function of the sealing mechanism 20b while preventing unexpected health damage due to a decrease in the sealing function.

  A similar remote operation can be performed for the top edge management of the cutting waste 56 by the vibrator 64. As shown in FIG. 6, the video data from the monitoring camera 62a is received at the construction office side, The received data is image-analyzed by the calculation processing unit 82 of the personal computer 81 installed in the construction office, so that the accumulated height of the cutting waste 56 is obtained and the accumulated height is compared with a threshold value. When the threshold value is exceeded, the vibrator 64 is wirelessly driven and controlled via the arithmetic processing unit 82 to make the top end of the cutting waste 56 uniform.

  According to such a configuration, it is possible to maximize the cutting waste storage efficiency without incurring health risks to workers.

DESCRIPTION OF SYMBOLS 1 Ground excavation system using a boring machine 2 Boring rod 4 Ground 5 Drilling hole 6 Annular gap 7 Ground surface opening 8 Boring machine 9 Rod cover 10 Reservoir (storage means)
11 Water tank (groundwater storage means)
20, 20b Seal mechanism 25 Internal space 31 of rod cover 31 Plug bodies 32a, 32b Thrust bearing (rolling mechanism)
33 Shoulder 34 Cylindrical casing 37 Loading section 38, 38b Pressure member 52 Exhaust port 53 Filter (capturing means)
54 Exhaust fan (forced exhaust means)
62a, 62b Monitoring camera 63a, 63b Water level meter 64 Vibrator (vibration applying means)
72 Hydraulic motor (rotary drive means)
77 Radiation measuring instrument

Claims (9)

The ground is excavated by a cutting bit arranged at the lower end of the boring rod by rotating the boring rod while moving forward to form a drilling hole, and the cutting waste generated by the excavation is gas such as compressed air. ground excavation with boring machine for conveying to the ground surface opening of the wellbore through the annular gap between the boring rods and the hole wall of the borehole in a manner to put the drilling fluid discharged from Tona Ri said cutting bit In the system,
A rod cover through which the boring rod is disposed so as to maintain hermeticity with the boring rod, and the rod cover is disposed by covering the ground surface opening of the excavation hole; The internal space of the rod cover is connected to the internal space of the rod cover in communication with the storage means, and the storage means is provided with an exhaust port for exhausting the gas. A ground excavation system using a boring machine, which is equipped with a trapping means capable of trapping harmful substances while allowing gas to pass through. The ground excavation system using a boring machine according to claim 1, wherein forced exhaust means is provided at the exhaust port so that the internal space of the storage means has a negative pressure. The rod cover is configured to maintain liquid tightness with the boring rod, and the groundwater transported through the annular gap and the internal space of the rod cover is maintained in the liquid tight state. The ground excavation system using the boring machine according to claim 1 or 2, wherein the storage means is configured to store water. The ground excavation system using the boring machine according to claim 3, wherein a groundwater storage means is connected in communication with the storage means. A seal mechanism is provided in a portion of the rod cover through which the boring rod passes, and the seal mechanism is formed in a hollow cylindrical shape so that the boring rod is inserted, and is expanded in a radial direction by a compressive load in the axial direction of the material. A flexible casing, a cylindrical casing formed with a shoulder for receiving the lower outer periphery of the stopper, and a compressive force applied to the stopper by a rotation operation around the upper axis of the cylindrical casing. The ground excavation system using the boring machine as described in any one of Claims 1 thru | or 4 comprised with the pressurization member by which the loading part which can load is projected. A rolling mechanism or a sliding material is interposed between the upper surface of the plug body and the load portion and between the lower surface of the plug body and the shoulder portion, and the outer peripheral surface of the plug body and the cylindrical casing The ground excavation system using the boring machine according to claim 5, wherein a friction reducing material is provided on at least one of the inner peripheral surfaces. The radiation measuring instrument is installed in the vicinity of the seal mechanism and outside the rod cover, and a rotation driving means capable of rotating the pressurizing member is connected to the pressurizing member. Ground excavation system using a boring machine. The monitoring camera or the water level gauge is installed in the storage means or the groundwater storage means in such a manner that video data from the monitoring camera or water level data from the water level gauge can be transmitted to the outside. A ground excavation system using the boring machine described above. The ground excavation system using a boring machine according to claim 7, wherein the rotation driving means is operated by remote control.

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