JP2008082101A - Opening/closing detector for enlarged diameter blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for directly confirming the enlargement of an enlarged diameter blade by a sensor since there have been no means for confirming the enlargement of the enlarged diameter blade mounted to the lower end of an auger drill in a technology for forming an enlarged bulb in the support ground of the lower end of a pile. <P>SOLUTION: The sensor 30 for directly detecting the opening/closing operation of the enlarged diameter blade of the auger drill is provided at the lower end 10 of the auger drill, and a communication cable 31 is disposed in a hollow part of an auger drill shaft. A connector 32 having a contact terminal crimped when connecting the auger drill is provided at a connection part of the auger drill shaft, and a signal of the sensor 30 can be confirmed on the ground by a display device of a voice signal or a visible signal, a recording device or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an opening / closing detection device for a diameter-expanded wing used for excavating a diameter-expanded portion of an underground pile that forms an enlarged bulb at the bottom of the pile.

  There is a technique for increasing the supporting force of a pile by forming an enlarged bulb integrated with the lower end of the pile in the supporting ground at the lower end of the pile. In such a technique, a diameter-enlarging blade consisting of a claw or the like that swings and expands around a support pin is attached near the lower end of the auger drill. When the auger drill is excavated with only the main blade of the auger drill and the auger drill is rotated in the reverse direction, the diameter expansion blade expands due to the resistance of the ground, and the stratum of the enlarged bulb forming part is agitated and excavated. (For example, refer to Patent Document 1).

However, there is actually no means for confirming whether or not the diameter-expanded blade has expanded when the auger drill is rotated in the reverse direction. Conventionally, it has been determined by increasing or decreasing the current or torque of the auger drill motor. . However, these fluctuations are generally not remarkable, and the change cannot be detected depending on the conditions of the formation. Therefore, it was difficult to confirm the agitation of the pile support layer at the bottom of the pile by the expanded wing and the bulb formation. In addition, in order to confirm the formation of the bulb, it is possible to drill the hollow part of the pile after construction to the root solidified part by core boring and grasp it by ultrasonic exploration, but it takes a long time and the cost becomes expensive. Exploring piles is difficult, and a small number of samples will be extracted and verified.
Japanese Examined Patent Publication No. 7-86231 (page 3-4, FIGS. 2, 3, 4 (b))

  When forming an enlarged bulb that integrates with the lower end of the pile in the support ground at the lower end of the pile, install an enlarged blade near the lower end of the auger drill and reversely rotate the auger drill to expand the enlarged blade. The stratum of the enlarged bulb forming part is stirred and excavated, but there was no means for confirming that the diameter-expanded blade was expanded at this time. An object of this invention is to provide the technique which confirms the expansion of a diameter expansion blade directly with a sensor.

  Means of the present invention for solving the above-mentioned problems include a sensor provided in the vicinity of an enlarged wing of an auger drill for directly detecting the opening / closing operation of the wing, and an auger drill in-shaft communication cable for transmitting the detected signal to the ground. And a display device for displaying the signal.

  A sensor that directly detects the opening and closing of the expanded wing when the expanded wing opens is installed. The sensor uses an ON / OFF switch, a toggle switch, a piezoelectric element, or the like that directly detects the expansion of the diameter expansion blade.

  The expansion information of the expanded wing detected by the sensor is transmitted as an electric signal to the ground with a communication cable passing through the hollow portion of the auger drill shaft. The hollow portion of the auger drill shaft is usually used as a passage for fluid such as compressed air, water, cement milk and the like. Communication cables are installed in it and installed to insulate and protect against these fluids.

  Electrical connectors are provided at both ends of the communication cable at the connection portion of the auger drill shaft. This electrical connector connects the communication cables in the adjacent shafts of the auger drill to each other when the auger drill shaft is connected. The communication cable has a structure that can be connected and disconnected with an electrical connector at the same time as connecting and disconnecting the auger drill shaft.

  A preferred example of the electrical connector provided at the joint end of the auger drill shaft is as follows.

  The electrical connector is mainly composed of a contact terminal that is electrically coupled to an adjacent connector when the auger drill shaft is joined, a seal gasket that covers the contact terminal, and a casing that covers the outer periphery thereof. The contact terminal includes a spring that is biased in the crimping direction. The casing includes a support leg that is fixed in the auger drill shaft, and the support leg also serves as an electric member that electrically couples the auger drill shaft and the casing. The seal gasket insulates between the casing and the contact terminal, and includes a ring-shaped tip crimping portion that protects the contact terminal from the external fluid when the auger drill shaft is joined. Use of such a communication cable is preferable because signal transmission is reliable. Such an electrical connector is conventionally used also for connection parts such as an in-pipe communication cable.

  Electrical connectors and communication cables have a structure that ensures high sealing performance using a material such as urethane having high water resistance.

  The signal conveyed by the communication cable is taken out from the swivel portion provided on the ground pile driving machine, so that the electric signal can be transferred on the ground without being influenced by the forward / reverse rotation of the auger drill.

  The transmitted electrical signal is displayed or recorded on a device such as an audio signal device, a visible signal display device, a digital electronic signal processing device, an automatic recording device, or a storage display device. For example, the time-lapse change of the electrical signal is recorded on a management recorder in the base machine with a printing pen, etc., and at the same time, the operator opens the expansion blade with a buzzer, a display lamp, etc. It is good to be able to confirm.

  When the opening / closing detection device for the enlarged wing according to the present invention is formed as a set of systems and the pile is sunk by the intermediate digging method or the outer digging method, the shape confirmation of the enlarged bulb construction can be reliably recorded and managed.

  In addition, by attaching a stress meter that detects the excavation torque of the expanded wing as the sensor to the auger head shaft, and recording and managing the electrical signal, the ground resistance at the tip of the expanded wing can also be detected, The support ground can be detected reliably, and the outline of the N value of the ground can be known.

  According to the present invention, it is possible to grasp the operation of the diameter expanding blade of the auger drill in real time. By knowing in real time the opening and closing of the expanded wing in this way, the shape of the root compaction bulb can be easily confirmed for each pile, and confirmation by special work other than normal work is not necessary, There is no reduction in efficiency of pile settlement work. Moreover, since the auger drill currently used can be used as it is, it is easy to modify, add or change. In addition, by using a stress meter as a sensor, the estimated value of the expanded wing tip ground strength can also be known for each pile.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 6 schematically shows a support pile having an enlarged bulb to which the present invention is applied. The pile 100 is submerged from the ground 120 into the ground by an intermediate digging method or an external digging method using an auger drill. When the auger drill reaches the support ground 130, the auger drill is rotated in the reverse direction to expand the diameter expanding blade, and the formation of the bulb portion 110 is stirred and excavated, and then cement milk or the like is injected into this portion to remove the bulb portion 110. Form.

  The diameter-expanded wing is rotated about the support pin by the resistance of the formation by rotating the auger drill in the reverse direction to expand the diameter. Conventionally, in this diameter expansion, an increase in driving power or torque of the auger drill is confirmed by visual observation with an ammeter or the like, but it is not easy to confirm these changes, and reliability is poor.

  FIG. 1 is a schematic side view of a lower end portion (auger head) 10 of an auger drill used in an embodiment of the present invention, and FIG. 2 is an AA arrow view thereof.

  The auger head 10 includes a blade part 12, an auger shaft 13, and a connection part 14, and includes a spiral blade 15 on the outer diameter of the auger drill. The blade portion 12 includes a digging blade 11 on the bottom surface, and a diameter-expanded blade 20 that rotates around a pin 21 is attached. When the auger drill rotates in the forward direction, the diameter-expanded blade 20 has a reduced diameter in close contact with the blade portion 12 as indicated by the arrow 22, and when the auger drill is rotated in the reverse direction, it is indicated by the arrow 23 around the pin 21. Rotate in the direction to increase the diameter, and excavate the formation.

  In the present invention, when the diameter-expanded blade 20 is expanded, a sensor 30 is attached to the blade portion 12 at a position where it is directly detected, and the detection signal passes through the auger drill shaft via the communication cable 31 and the connector 32 and is grounded. To be transmitted.

  The auger drill is used with an auger drill shaft connected in the length direction according to the drilling depth.

  FIG. 3 shows a cross-sectional view of the connecting portion of the vertical axis of the auger drill. In FIG. 3, the display of screw blades is omitted. A socket 41 having a hexagonal hole is formed at the end of the auger drill shaft 40a, and a plug 42 having a hexagonal outer periphery is formed at the end of the auger drill shaft 40b connected thereto. When the shafts 40a and 40b are moved in the axial direction to engage the hexagon, and an engagement pin (not shown) is driven perpendicular to the shaft, the socket 41 and the plug 42 are firmly fixed.

  The auger drill shafts 40a and 40b are provided with hollow holes for supplying pressure fluid, cement milk and the like to the ground, and communication cables 31 are built in the hollow holes over the entire length of each auger drill shaft. . Electrical connectors 50 are provided at both ends of the communication cable 31, and the electrical connectors 50 are fixed in the auger drill shafts 40a and 40b.

  An example of the electrical connector 50 is shown in FIG. FIG. 5 is a BB arrow view (front view) of FIG. The electrical connector 50 has a crimp terminal 51 protruding at the tip. The crimp terminal 51 is urged in a protruding direction by a spring 53. The spring 53 and the spring seat 54 serve as an electric conductor and are connected to one line 55 (plus voltage line) of the communication cable 31. As shown in FIG. 5, the casing 61 that forms the outer skin is provided with three legs 80 on the outer periphery, and the tips of the legs 80 are fixed inside the auger drill shaft, and the casing 61 and the auger drill shaft are electrically connected. It is connected. The rear casing 62 is coupled to the casing 61 by a screw via a sealing material 63. The other casing 56 (ground line) of the communication cable 31 is electrically coupled to the rear casing 62.

  In the gap between the crimp terminal 51 and the casing 61, a seal gasket 70 that insulates the two is interposed. When the auger drill shafts 40a and 40b are joined, the seal gasket 70 has its ring-shaped tips crimped to each other, seals the storage space for the crimp terminal 51, and passes through the auger drill shaft. Seal to prevent entry of cement milk. The seal gasket 70 is made of, for example, nitrile rubber having a rubber hardness of 60 ° C.

  An insulating material 71 is mounted between the spring seat 54 and the casing 61 and the rear casing 62 to electrically insulate the spring seat 54 from the casings 61 and 62.

  The joint between the communication cable 31 and the electrical connector 50 is covered and protected by a coating 72 made of urethane resin or the like.

  The signal current is transmitted from the positive voltage line 55 through the spring seat 54, the spring 53, and the crimp terminal 51, and the ground wire 56 passes through the rear casing 62, the casing 61, the leg 80, the plug 42, and the socket 41 to the auger drill shaft. Are combined.

  The device of the present invention is used by being mounted on an auger drill having a swivel mechanism, and a signal of a communication cable is transmitted from the swivel mechanism to a display device on the ground. As the display device or the like, a bell, a buzzer or other acoustic device, a visible signal display device such as a display lamp or an indicator, a paper recording device, an electric signal device, or an electronic storage / display device may be used.

It is a side view of an auger head. It is an AA arrow line view of FIG. It is sectional drawing which shows the connection part of an auger shaft. It is sectional drawing which shows the example of an electrical connector. It is a front view (BB arrow view) of FIG. It is explanatory drawing of the support pile which has an expansion bulb.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Auger head 11 Excavation blade 12 Cutting tool part 13 Auger shaft 14 Connection part 15 Spiral blade 20 Expanded blade 21 Pin 22, 23 Arrow 30 Sensor 31 Communication cable 32 Connector 40a, 40b Auger drill shaft 41 Socket 42 Plug 50 Electrical connector 51 Crimping Terminal 53 Spring 54 Spring seat 55 Positive voltage line 56 Ground wire 61 Casing 62 Rear casing 63 Sealing material 70 Sealing gasket 71 Insulating material 72 Covering 80 Leg 100 Pile 110 Bulb portion 120 Ground 130 Support ground

Claims (3)

  A sensor that is provided close to the auger drill's expanded wing and directly detects the opening / closing operation of the expanded wing, a communication cable installed in the auger drill shaft that transmits the detected signal to the ground, and a display that displays the signal A device for detecting opening and closing of an enlarged wing, characterized by comprising:   Each of the communication cables includes an electrical connector at a joint end of the auger drill shaft. The electrical connector includes a contact terminal that is electrically coupled to an adjacent connector when the auger drill shaft is joined, a seal gasket that covers the contact terminal, and an outer periphery thereof. The contact terminal is provided with a spring for biasing in the crimping direction, the casing is provided with a support leg for fixing in the auger drill shaft, and the support leg electrically connects the auger drill shaft and the casing. A ring-shaped tip that also serves as an electrical member to be coupled to the insulating gasket and insulates and protects the contact terminal from an external fluid when the auger drill shaft is joined while the seal gasket insulates between the casing and the contact terminal 2. The opening / closing detection device for an enlarged blade according to claim 1, further comprising a crimping portion.   2. The expansion according to claim 1, wherein the display device is one or more devices selected from the group consisting of an audio signal device, a visible signal display device, a digital electronic signal, an automatic recording device, and a memory display device. Open / close detector for radial wings.

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