JP6127031B2 - Underground pressure measuring device - Google Patents

Description

  The present invention relates to a soil pressure measuring device used for measuring the pressure in the soil when excavating the ground with a drilling device.

  Conventionally, ground improvement methods have been widely used to excavate the ground with a drilling device, mix the cement-based solidified material into the excavated soil, stir and mix the excavated soil and the solidified material, and strengthen the ground by solidification. Yes. In this ground improvement method, since the solidification material is mixed in the excavated soil, a construction method for improving the ground while measuring the pressure in the soil has been devised (see, for example, Patent Document 1). ).

JP 2000-328554 A

  However, when the ground is improved, the excavated sediment and solidified material are in a state of fluidization in the soil. Therefore, if pressure sensors such as existing pressure gauges, earth pressure gauges and water pressure gauges are used, Or solidified material adheres to the pressure sensor and solidifies, making it impossible to accurately measure the pressure in the soil. Moreover, the cleaning operation | work which removes the earth and sand and the solidification material adhering to a pressure sensor is needed.

  In particular, when excavating the ground or when stirring and mixing the excavated soil and the solidified material, the excavator is rotating in the soil, so it is affected by the pressure generated by the rotation, and the desired pressure is accurately set. It cannot be measured.

Therefore, in the present invention according to claim 1, a pressure sensor is housed in a sealable casing in a soil pressure measuring device that is mounted on a drilling device for excavating the ground and measures the pressure in the excavated soil. In addition, a pressure transmission medium capable of transmitting pressure is filled in the casing, and a pressure receiving part is provided for transmitting the pressure received in the soil to the pressure sensor via the pressure transmission medium, the pressure receiving part is was Rukoto partially disposed in a protective case that houses the casing.

  In the present invention according to claim 2, in the present invention according to claim 1, the pressure receiving portion is provided in a direction different from a direction in which the excavator rotates during excavation.

  And in this invention, there exists an effect described below.

  That is, in the present invention, in a soil pressure measuring device that is attached to a drilling device that excavates the ground and measures the pressure in the excavated soil, a pressure sensor is housed in a sealable casing, and the pressure is controlled. Since a pressure transmission medium that can be transmitted is filled into the casing and the pressure received in the soil is transmitted to the pressure sensor via the pressure transmission medium, it is provided with excavated soil and ground improvement. It is possible to prevent the solidifying material used from adhering to the pressure sensor, so that the pressure in the soil can be accurately measured, and the labor required for the cleaning work to remove earth and sand and the solidifying material is reduced. be able to.

  In particular, when the pressure receiving part is provided in a direction different from the direction in which the excavator rotates during excavation, it is possible to eliminate the effect of the pressure received by the rotation of the excavator during excavation, and to increase the pressure in the soil. More accurate measurement can be performed.

  Further, when the pressure receiving part is partially provided in the protective case that houses the casing, the pressure sensor can be double-protected by the casing and the protective case, and the failure of the pressure sensor can be prevented. In addition, by partially forming the pressure receiving portion in the protective case, the degree of freedom of the shape, position, and directivity of the pressure receiving portion is increased, and a wide variety of pressure sensors can be used according to the usage environment.

Explanatory drawing which shows a ground improvement apparatus. FIG. The front view (a), side surface sectional view (b), and plane sectional view (c) showing the soil pressure measuring device. The top view (a), front view (b), top view (c), front sectional view (d) which shows another soil pressure measuring device. Front sectional view (a) and bottom view (b) showing another soil pressure measuring device.

  Below, the concrete structure of the underground pressure measuring device which concerns on this invention is demonstrated, referring drawings.

  The soil pressure measuring device 1 is attached to, for example, a drilling device 3 provided in the ground improvement device 2 and used to measure the pressure in the soil of the ground 4 excavated.

  As shown in FIG. 1, the ground improvement device 2 has a support column 6 installed at the front end of a heavy machine 5, and a drilling device 3 is attached to the support column 6 so as to be movable up and down. An improved material supply mechanism 11 comprising a water tank 8, an improved material storage tank 9 and an improved material discharge pump 10 is connected in communication via a swivel joint 12.

  The excavator 3 has a lifting support 13 attached to the front side of the support column 6 so as to be lifted and lowered. The lifting support 13 is equipped with a drive motor 14 and a reverse transmission 15 linked to the drive motor 14. A base end portion of the excavation shaft 16 is interlocked to the transmission 15 and a stirring blade 17 is attached to the distal end portion of the excavation shaft 16.

  As shown in FIG. 2, the excavation shaft 16 is formed in a double tubular shape with a hollow cylindrical inner shaft 18 and an outer shaft 19 arranged coaxially, and the reversal transmission 15 includes an inner shaft 18 and an outer shaft. The inner shaft 18 and the outer shaft 19 are relatively rotated in opposite directions by the action of the reverse transmission 15.

  The stirring blade 17 includes a pair of left and right tip-side stirring blades 20 formed at the tip portion of the inner shaft 18, a pair of left and right innermost stirring blades 21 formed at the tip portion of the outer shaft 19, and a middle portion on the tip side of the inner shaft 18. A pair of left and right inner stirring blades 22 formed in a substantially U-shape at the center, and an outer stirring blade 23 formed in a substantially U-shape at 120 degree intervals in the circumferential direction at the front end side middle portion of the outer shaft 19 It is composed. Here, since the inner shaft 18 and the outer shaft 19 are rotated in the opposite directions relatively by the reverse transmission 15, the tip side stirring blade 20 and the inner stirring blade 22 formed on the inner shaft 18 are The innermost agitating blade 21 and the outer agitating blade 23 formed on 19 rotate relatively in opposite directions.

  The tip-side agitating blade 20 is attached to the outer peripheral surface of the tip of the inner shaft 18 with a plate-like blade body 24 in an inclined shape, and a plurality of excavation bits 25 are attached to the lower end side portion of the blade body 24 at intervals. An improvement material discharge port 26 is formed above the wing body 24. The improvement material discharge port 26 communicates with the improvement material supply mechanism 11 through the hollow portion of the inner shaft 18. The innermost stirring blade 21 has a plate-like blade body 27 attached to the outer peripheral surface of the tip of the outer shaft 19 in an inclined manner. The inner stirring blade 22 has a lower end attached to the outer peripheral surface of the inner shaft 18, an annular body 28 attached to the upper end, and the annular body 28 is loosely fitted to the outer peripheral surface of the outer shaft 19. The inner stirring blade 22 has plate-shaped small blade pieces 29, 30, and 31 attached to the outer surface, the inner surface, and the upper surface, respectively. Further, the inner stirring blade 22 is attached with a connecting blade piece 32 between the inner shaft 18 and an improved material discharge port 33 is formed in the connecting blade piece 32. The improvement material discharge port 33 communicates with the improvement material supply mechanism 11 through the hollow portion of the inner shaft 18. The outer agitating blade 23 has an upper end portion attached to the outer peripheral surface of the outer shaft 19 and an annular body 34 attached to the lower end portion, and the annular body 34 is loosely fitted to the outer peripheral surface of the inner shaft 18. Further, the outer agitating blade 23 has plate-like small blade pieces 35 and 36 attached to the inner surface.

  The excavator 3 is configured as described above, and the soil pressure measuring device 1 is attached to the outer periphery of the inner shaft 18 via the attachment 37. The soil pressure measuring device 1 is not limited to the inner shaft 18, and a plurality of soil pressure measuring devices 1 may be attached to the outer shaft 19, the stirring blade 17, and the like.

  As shown in FIG. 3, the soil pressure measuring apparatus 1 accommodates a pressure sensor 38 in a casing 39 and accommodates the casing 39 in a protective case 40.

  The pressure sensor 38 only needs to be able to measure pressure, and an existing pressure gauge, earth pressure gauge, water pressure gauge, or the like can be used. The pressure sensor 38 may be configured to change the measured pressure into an electrical signal and output it by wire or wirelessly, and may be configured to accumulate the measured pressure as data.

  The pressure sensor 38 is surrounded by a hollow cylindrical fixing member 41 having elasticity (cushioning properties) such as sponge and disposed inside the casing 39. This prevents the position of the pressure sensor 38 from being displaced due to vibration or the like, making it impossible to measure a desired pressure, damaging the pressure sensor 38, or causing a measurement error.

  In the casing 39, a lid 43 is detachably screwed into an opening of a flexible hollow cylindrical body 42 so that the inside can be sealed. In the sealed internal space of the casing 39, a pressure sensor 38 is accommodated, and a pressure transmission medium 44 such as water, oil or sand capable of transmitting pressure is filled. Thus, when the casing 39 receives pressure from the outside, the pressure is transmitted to the pressure sensor 38 via the pressure transmission medium 44, and the pressure sensor 38 can measure the pressure. The pressure transmission medium 44 is appropriately selected according to the pressure sensor 38 to be used, the use environment, and the like, but is preferably a substance that does not change in volume due to pressure.

  In the protective case 40, a lid body 46 and a bottom body 47 are detachably attached to upper and lower openings of a hollow cylindrical body 45. The body 45 is formed with a plurality of through holes 48 only in a specific direction (surface) on the front side. As a result, earth and sand or solidified material excavated in the soil passes through the through-hole 48 and presses the casing 39 inside the protective case 40, whereby the pressure is measured by the pressure sensor 38 via the pressure transmission medium 44. can do. Therefore, the through hole 48 functions as a pressure receiving portion 49 for transmitting the pressure received in the soil to the pressure sensor 38 via the pressure transmission medium 44. Note that the pressure receiving unit 49 appropriately determines the position, number, size, shape, and the like in consideration of the situation in the soil such as earth and sand and the solidified material, the direction of the pressure to be measured, and the like.

  The soil pressure measuring device 1 is mounted on the excavator 3 with the pressure receiving portion 49 facing the outside of the excavator 3 (in the radial direction of the excavator 3 rotating during excavation). Thereby, when the ground is improved (during excavation or mixing), the pressure received by the rotation of the excavator 3 (pressure in the circumferential direction of the rotating excavator 3) or the pressure received by the excavator 3 ascending / descending (elevating / lowering) The pressure in the vertical direction of the excavating device 3 to be controlled) can be suppressed, and the desired pressure in the soil can be accurately measured.

  The underground pressure measuring device 1 is not limited to the configuration shown in FIG. For example, in the underground pressure measuring device 1, the pressure receiving portion 49 is formed only on the body 45 of the protective case 40. However, in the underground pressure measuring device 1a shown in FIGS. Not only the 50 trunks 51 but also the lid body 52 and the bottom body 53 are formed with penetrating slits as pressure receiving portions 54.

  The soil pressure measuring device 1 has a double structure in which the casing 39 is accommodated inside the protective case 40. However, the soil pressure measuring device 1b shown in FIGS. 4 (c) and 4 (d) has a hollow cylinder. By attaching the lid 56 and the bottom body 57 in close contact with the upper and lower openings of the cylindrical body 55 to form the casing 58, the internal space of the casing 58 can be sealed, and the pressure sensor 38 is fixed in the internal space While accommodating through the member 41, the internal space is filled with the pressure transmission medium 44. The lid 56 includes a toric body 59 having rigidity and a sealing body 60 having elasticity such as rubber, and the sealing body 60 is closely attached to the opening of the body 55 by the annular body 59 and fixed. Yes. Accordingly, the circular through-hole at the center of the lid 56 functions as the pressure receiving portion 61.

  Further, in the soil pressure measuring device 1c shown in FIG. 5, the interior is composed of a body 63 that is partitioned vertically by a partition wall 62, a lid body 64, a bottom body 67 that includes an annular body 65 and a sealing material 66. A casing 68 capable of sealing the space is formed, and a circular penetrating pressure receiving portion 69 is formed at the center of the bottom body 67. The pressure sensor 70 is arranged in the upper space of the fuselage 63, and the pressure sensor 70 and the pressure are received by the pressure receiving part 72 of the pressure sensor 70 filled with the pressure transmission medium 71 in the lower space of the fuselage 63 and inserted through the partition wall 62. The transmission medium 71 is linked. A communication device 73 is accommodated in the upper space of the body 63 so that the pressure measured by the pressure sensor 70 can be communicated to the ground wirelessly.

  As described above, the soil pressure measuring devices 1, 1a, 1b, 1c contain pressure sensors 38, 70 in the sealable casings 39, 58, 68, and can transmit pressure. Pressure receiving parts 49, 54, for filling the inside of the casings 39, 58, 68 with the transmission media 44, 71 and transmitting the pressure received in the soil to the pressure sensors 38, 70 via the pressure transmission media 44, 71, 61, 69 are provided.

  Therefore, in the soil pressure measuring devices 1, 1a, 1b, and 1c having the above-described configuration, it is possible to prevent the excavated earth and sand, the solidified material used for ground improvement, and the like from adhering to the pressure sensors 38 and 70. Thereby, while being able to measure the pressure in soil correctly, the effort which the cleaning operation | work which removes earth and sand and a solidified material can be reduced.

  The soil pressure measuring devices 1, 1a, 1b, and 1c have pressure receiving portions 49, 54, 61, and 69 in a direction different from the direction in which the excavating device 3 rotates during excavation. .

  Therefore, the soil pressure measuring devices 1, 1a, 1b, and 1c configured as described above can eliminate the influence of the pressure received by the rotation of the excavating device 3 during excavation, and more accurately measure the pressure in the soil. Can do.

  Further, the soil pressure measuring devices 1, 1 a are configured such that the pressure receiving portions 49, 54 are partially provided in the protective cases 40, 50 in which the casing 39 is accommodated.

  Therefore, in the soil pressure measuring devices 1 and 1a configured as described above, the pressure sensor 38 can be double protected by the casing 39 and the protective cases 40 and 50, and the failure of the pressure sensor 38 can be prevented. . In addition, by forming the pressure receiving parts 49, 54 partially in the protective cases 40, 50, the degree of freedom of the shape, position and directivity of the pressure receiving parts 49, 54 is increased, and a wide variety of pressures depending on the usage environment, etc. Sensor 38 can be used.

1,1a, 1b, 1c Underground pressure measuring device 2 Ground improvement device 3 Drilling device 4 Ground 5 Heavy machinery 6 Prop 7 Improvement material mixing plant 8 Water tank 9 Improvement material storage tank 10 Improvement material discharge pump
11 Improved material supply mechanism 12 Swivel joint
13 Lifting support 14 Drive motor
15 Reverse transmission 16 Drilling shaft
17 Stirring blade 18 Inner shaft
19 Outer shaft 20 Stirring blade on tip side
21 Inner stirring blade 22 Inner stirring blade
23 Outer stirring blade 24 blade body
25 Drill bit 26 Improved material outlet
27 Wings 28 Rings
29,30,31 Small blade 32 Linked blade
33 Improvement material outlet 34 Toroid
35,36 Small blade 37
38 Pressure sensor 39 Casing
40 Protective case 41 Fixing member
42 fuselage 43 lid
44 Pressure transmission medium 45 Body
46 Lid 47 Bottom
48 Through hole 49 Pressure receiver
50 protective case 51 fuselage
52 Lid 53 Bottom
54 Pressure sensing part 55 Body
56 Lid 57 Bottom
58 Casing 59 Torus
60 Seal body 61 Pressure receiver
62 partition wall 63 fuselage
64 Lid 65 Torus
66 Sealing material 67 Bottom body
68 Casing 69 Pressure receiver
70 Pressure sensor 71 Pressure transmission medium
72 Sensor rod 73 Communication device

Claims (2)

In the soil pressure measuring device that is attached to a drilling device that excavates the ground and measures the pressure in the excavated soil,
A pressure sensor is housed in a sealable casing, and a pressure transmission medium capable of transmitting pressure is filled in the casing, and the pressure received in the soil is transmitted to the pressure sensor via the pressure transmission medium. A soil pressure measuring device, characterized in that a pressure receiving portion is provided , and the pressure receiving portion is partially provided in a protective case that houses the casing . The soil pressure measuring device according to claim 1, wherein the pressure receiving portion is provided in a direction different from a direction in which the excavator rotates during excavation.

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