JP2008150834A - Pile hole drilling head, and method for checking position of drilling arm of it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure the accurate drilling of a pile hole throughout its length by grasping the diameter of the pile hole at that depth on the ground in real time, in consideration of the length of the drilling arm 20, by measuring the angle of the oscillation of the drilling arm 20. <P>SOLUTION: A drilling head 30 is constituted by oscillatably mounting the drilling arms 20 and 20 with first sensors 27 and 28 on the horizontal shaft 19 of a head body 1 with second sensors 27A and 28A along an oscillation locus. When a drilling rod 40 is normally rotated, a pile-hole axis section 42 with a diameter D<SB>1</SB>is drilled by means of a drilling blade 25 (a: a small-diameter drilling state). When the drilling rod 40 is reversely rotated, a base-enlarged foot protection portion 43 with a diameter D<SB>2</SB>is drilled (b: a large-diameter drilling state). In this case, the first sensor 27 is located in the position 27Ab of the second sensor 27A during the small-diameter drilling, and located in the position 27Ab of the second sensor 27A during the large-diameter drilling. Thus, oscillation angle data are transmitted onto the ground. When the drilling rod 40 is not rotated, the first sensor 27 is located in the position 27Aa of the second sensor 27A, and data with no drilling angle are transmitted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a pile hole excavation head used when excavating a pile hole in the ground, and a pile hole excavation head capable of excavating a large-diameter enlarged portion with a single excavation head with respect to a small-diameter shaft portion, and The present invention relates to a method for confirming the position of a drilling arm of a pile hole drilling head used in the pile hole drilling head.

  Conventionally, drilling a pile hole, placing a rebar cage into the pile hole and filling the concrete with a pile, or a pre-excavation method in which the pile hole is drilled and the ready-made pile is placed inside the pile hole The medium digging method that gradually descends into the pile hole is used. In either case, the diameter of the bottom of the pile hole or the like may be larger than the shaft portion of the pile hole.

  In this case, when excavating the pile hole shaft part (small diameter) and the pile hole widening part (large diameter) with a single excavation head, an enlargement excavation blade is used separately from the excavation blade for excavating the shaft part. A structure has been proposed in which a drilling blade is opened hydraulically (Patent Document 1), or an expansion drilling blade is opened pneumatically (Patent Document 2).

  However, the structure that uses hydraulic pressure or air pressure (especially hydraulic pressure) increases the size of the device, so a drilling arm with a drilling blade at the tip is a simple device that can drill large-diameter pile holes with a small device. A drilling head has been proposed in which the drilling diameter is changed by the earth pressure and the drilling diameter is changed in the swinging direction (Patent Documents 3 and 4).

In addition, regarding the application of various sensors to the excavating rod, a proposal (Patent Document 5) for efficiently supplying power (controlling to the internal combustion engine) by sensing the supply pressure and the rotational speed of the hydraulic motor of the auger, There are proposals (Patent Document 6) for detecting inclination and maintaining verticality, and proposals (Patent Document 7) for managing the number of buried piles by detecting the length of the piles.
JP 63-184612 A JP-A-3-221697 JP-A-3-260279 JP-A-2005-307496 JP 2000-73680 A JP-A-11-148290 Japanese Patent Laid-Open No. 7-11643

  The excavation head used in the pile hole cannot see the state of the excavation head (shaft excavation state or expanded diameter excavation state) from the ground. Although it was estimated by the pressure, the operation is reliable, but the device is large, and in some cases, 50m or more is excavated while connecting a rod of about 10m, and the pressure of the hydraulic pipe or the pneumatic pipe is maintained and connected. There is a need to devise the connection structure, and it takes time for the connection, which may hinder the shortening of the construction period (Patent Documents 1 and 2).

  Also, in the case of a drilling head with a structure that swings the drilling arm by changing the rotation direction of the drilling rod and opens with earth pressure, it is a simple structure and it is completed with the drilling head at the tip, so it connects up and down The situation of the excavation arm was able to be grasped by grasping the rotation direction. However, it was not possible to directly grasp the excavation diameter, that is, to confirm the swinging state of the excavating arm.

  In addition, no proposal has been made to use various sensors for grasping the excavation diameter of the excavation head. Therefore, in either case, the state of the expanded head cannot be grasped from the ground, and means for verifying that the head is opened more reliably has been demanded.

  However, this invention is an excavation head in which an excavation arm is swingably attached to the head body, and an angle sensor is provided on the horizontal axis, or a first sensor is provided on the excavation arm, and the relative position of the first sensor is detected on the head body. Since the second sensor to be provided was provided, the above problems were solved.

  That is, according to the present invention, the upper end portion of the excavating arm having the excavating blade at the lower end portion is swingably attached to both sides of the head body having the connecting portion with the excavating rod at the upper end portion via the horizontal shaft. In the excavation head, a pile hole characterized in that a sensor for detecting a swing angle of the excavation arm with respect to the horizontal axis is attached to the head body or excavation arm, and data transmission means from the sensor to the ground is provided. Drilling head.

  According to another invention, the upper end of an excavating arm having an excavating blade at the lower end is swingably attached to both sides of a head body having an excavating rod connecting portion at the upper end via a horizontal shaft. A first sensor is attached to the head body side surface of the excavation arm, and a second sensor is attached to the head body in accordance with the trajectory of the first sensor when the excavation arm swings. In the excavation head or on the ground, a position confirmation unit and a data transmission unit are provided, and the position confirmation unit includes the first sensor or the second sensor in the length direction of the second sensor. The pile hole excavation head has a function of knowing a relative position of the sensor, and the data transmission means has a function of transmitting information of the position data to the ground. Further, in the above, an upper protrusion is formed at the upper end of the excavating arm, and a first sensor is attached to the lower portion of the horizontal axis and the upper protrusion with the excavating arm, respectively, and the head sensor is attached to each of the first sensors. It is a pile hole excavation head characterized by attaching corresponding second sensors.

  Further, in each of the above inventions, the pile hole excavation head accommodates the operating power source of each sensor in the head body or excavation arm. Further, a pile comprising a power unit connected to a horizontal shaft, and the power unit has a function capable of forcibly swinging by selecting an excavation arm on one side or both sides. It is a hole drilling head.

According to another invention, the upper end of an excavating arm having an excavating blade at the lower end is swingably attached to both sides of a head body having an excavating rod connecting portion at the upper end via a horizontal shaft. In the drilling head
(1) A reference point is set on the surface of the head body with the excavating arm, a swing range is set on the head body corresponding to a swing locus of the reference point,
(2) By acquiring position information where the reference point is located within the swing range,
(3) Check the swing angle of the excavating arm.
This is a method for confirming the position of the excavating arm of the pile hole excavating head.

  A drilling head having a drilling arm that can swing around a horizontal axis. A first sensor is attached to the surface of the head body side of the drilling arm, and the second sensor is adjusted to the track of the first sensor when the drilling arm swings. Since the excavation head is configured with the first sensor as the reference point, where the first sensor, which is the reference point, is located in the swing range of the second sensor, corresponding to the swing of the excavation arm, with the first sensor as the reference point Data can be sent to the ground, and the swing angle of the excavating arm can be confirmed on the ground. In addition, since the sensor for detecting the swing angle of the swing arm with respect to the horizontal axis is provided, the swing angle of the excavating arm can be confirmed on the ground.

  Therefore, if the length of the excavation arm is applied on the ground, there is an effect that the excavation diameter at the depth of excavation can be visually confirmed. Therefore, if processing is performed together with the excavation current value data, the excavation head depth data, the N value data, etc., there is an effect that an accurate pile hole can be constructed. For example, even if the excavation arm swings less at a certain depth and the pile hole diameter becomes smaller, the information can be grasped instantly, so that the depth of the pile hole is finished by excavating the depth repeatedly. be able to.

  In addition, if two or more sensors are provided, there is an effect that the excavation diameter can be grasped by using information from the other sensor even if any one of the sensors is inconvenient.

  In addition, if the power source for operating the sensor is built in the excavation head, the power supply from the ground can be eliminated, and the wiring to the ground can be simplified, so that the structure of the upper and lower connecting portions of the excavation rod can be simplified. Further, wireless transmission is also possible, and in this case, the wiring itself can be omitted.

Excavation heads 30 are configured by attaching excavation arms 20 and 20 to a head main body 1 having a connection portion 11 for connection to an excavation rod 40 so as to be swingable by a horizontal shaft 19 (FIG. 1). The excavation head 30 has an excavation blade 25 at the tip of the excavation rod 40, and when the excavation rod 40 is not rotated, the excavation arms 20 and 20 hang downward (FIG. 1 (a)). . under sagging state), by forward rotation of the drill rod 40, as indicated by the arrow 31 on one side, digging arm 20 swings in earth pressure, Kuiana shank diameter D ₁ in digging edge 25, 25 42 can be excavated (FIG. 2A). Further, the drill rod 40 by reverse rotation, such as the arrow 32 on one side, digging arm 20 swings in earth pressure, can be drilled拡底root consolidated portion 43 of diameter D ₂ with digging edge 25, 25 (FIG. 2B. Large-diameter excavation state).

  Further, a first sensor (reference point) 27 is attached to the intermediate portion 22 of the excavation arm 20 of the excavation head 30, and a first sensor (reference point) 28 is attached to the upper protrusion 26. When the excavating arm 20 swings on one side surface 6 of the bulging portion 5 of the head body 1, a second sensor (swinging range) 27A having a shape along the swinging trajectory of the first sensor 27 is attached and excavated. A second sensor (oscillation range) 28 </ b> A is attached to the surface 26 a of the upper protrusion 26 of the arm 20.

  Accordingly, the sensors 27, 27A, 28, and 28A operate as follows according to the drooping state, the small-diameter excavation state, and the large-diameter excavation state of the excavation arm 20.

(A) In cooperation with the first sensor 27 and the second sensor 27A, the first sensor 27 is
・ "Located at the central portion 27Aa of the second sensor 27A"
(FIG. 1 (a). Sagging state)
・ "Located on the shaft excavation side 27Ab of the second sensor 27A"
(Fig. 2 (a). Small-diameter excavation state)
・ "Located on the enlarged excavation side 27c of the second sensor 27A"
(Fig. 2 (b). Large-diameter excavation state)
Information on whether or not it is located in the middle of 27Aa, 27Ab, and 27Ac is sent to the ground.
(B) In cooperation with the first sensor 28 and the second sensor 28A, the first sensor 28 is
・ "Located at the central portion 28Aa of the second sensor 28A"
(FIG. 1 (a). Sagging state)
・ "Located on the shaft excavation side 28Ab of the second sensor 28A"
(Fig. 2 (a). Small-diameter excavation state)
・ "Located on the enlarged excavation side 28c of the second sensor 28A"
(Fig. 2 (b). Large diameter excavation state)
Information on whether or not it is located in the middle of 28Aa, 28Ab, or 28Ac is sent to the ground.

  Therefore, the position information of where the reference point 27 (28) is located in the swing range 27A (28A) is obtained from these, and thereby the swing angle of the excavating arm 20 is grasped, and the excavating arm 20 is obtained. Is taken into consideration (the length from the horizontal axis 19 to the excavation blade 25), the excavation diameter at that depth can be determined.

  At this time, the data of the first sensor 27 (28) and the second sensor 27A (28A) are associated with each other, the position information is processed by the position confirmation means, and amplified if necessary by the data transmission means and sent to the ground. The data transmission means is usually composed of wiring to the ground and necessary circuits. However, if the wireless transmitter is the data transmission means, the wiring can be omitted. Further, the position confirmation means is constituted by an electric circuit provided in the excavation head 30 (in the head main body 1 or the excavation arm 20) or an electric circuit installed on the ground.

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

1. Configuration of excavation head 30

  (1) The head body 1 has a hexagonal connection portion 11 connected to the upper end 2 a of the quadrangular columnar base 2, and a flat bulging portion 5 is formed continuously with the lower edge of the base 2. The base portion 2 has one side surfaces 3 and 3 that face each other and other side surfaces 4 and 4 that are adjacent to and face the side surface 3. A horizontal shaft 19 is attached to the side surfaces 3 and 3.

  The base 2 is dimensioned so that the widths of the other side surfaces 4 and 4 are reduced so that the one side surfaces 3 and 3 approach toward the lower side, and reaches the bulging portion 5 continuously from the lower end of the base portion 2. Yes. The bulging portion 5 is formed so as to bulge in the horizontal direction so that the width of one side surface 3, 3 is increased. The side surfaces 3 and 4 are formed so as to approach each other.

  The lower edge 10 of the bulging portion 8 is formed in an arc along the swinging trajectory of the excavating arm 20, and the fixed excavating blades 9 are attached to the lower end surface 7 downward. A surface continuous with one side surface 3 of the base 2 on the surface of the bulging portion 5 is defined as one side surface 6. Further, the stirring blades 17 and 18 are inclined on the other side surfaces 4 and 4 of the head body 1 and the mounting heights are different on the other side surfaces 4 and 4 (the stirring blade 17 is positioned above the stirring blade 18). Attached).

  (2) A horizontal shaft 19 is formed so as to protrude from one side surfaces 3 and 3 of the base 2 of the head body 1. The horizontal axis 19 can be either an integral axis or a divided axis as long as the axes coincide on the side surfaces 3 and 4. A base end portion 21 of the excavating arm 20 is attached to the horizontal shaft 19 so as to be swingable. Further, since the horizontal shaft 19 only needs to be an axis that can rotate the excavating arm 20, the horizontal shaft 19 may be provided on the excavating arm 20 and a bearing may be provided on the head body 1.

  (3) The excavating arm 20 has a base end portion 21 that is formed with a large diameter around the horizontal axis 19, a small width at the intermediate portion 22, and a wide end portion 23. The excavating arm 20 is deformed along the deformation of the surface shape of the one side surface 3, 3 of the head body 1, and the shape change of the base 2 and the bulging portion 5 of the head body 1 (the one side surface 3, 3 is directed downward). In addition, the two excavating arms 20 and 20 are bent so that they approach each other, and the lower part of the bulging portion 5 is directed outward (excavating arms 20 and 20 are Bend away) Excavation blades 25, 25 project from the distal end portion 23 of the excavation arm 20 in a direction toward the outside (so that the excavation arms 20, 20 are separated).

  An upper protrusion 26 is formed on the upper end of the base 21 of the excavating arm 20 (that is, on the opposite side of the excavating blade 25 across the horizontal shaft 19 in the length direction of the excavating arm 20). A surface 26a on the head main body 1 side of the upper protrusion 26 is in a position close to one side surface 3 of the head main body 1 in consideration of attachment of sensors 28 and 28A described later and effective operation.

  (4) The first sensor 272 is attached to a portion of the excavating arm 20 facing the head main body 1 and located on the bulging portion 5 of the head main body 1. When the excavating arm 20 swings on one side surface 6 of the bulging portion 5 of the head body 1, an arc-shaped second sensor 27 </ b> A is attached within a range along the path of the first sensor 27.

  The first sensor 28 is attached to the surface 26 a of the upper protrusion 26 of the excavating arm 20. When the excavating arm 20 swings in the vicinity of the upper edge 2a of the base 2 of the head body 1, an arc-shaped second sensor 28A is attached within a range along the path of the first sensor 28.

The second sensor 27A functions so as to sense where the first sensor 27 is located on the second sensor 27A. As for the position of the first sensor 27, it is desirable that the position of the second sensor 27A can be continuously detected, but at least three positions, that is, the first sensor 27 is near the center 27Aa of the second sensor 27A. The position of the excavation head 20 in a drooping state (FIG. 1A),
The first sensor 27 is located near the right end 27Ab of the second sensor 27A (the excavation head 20 is in a small-diameter excavation state) (FIG. 2 (a)),
The position of the first sensor 27 near the left end 27Ab of the second sensor 27A (the excavation head 20 is in a large-diameter excavation state) (FIG. 2B)
If you can grasp where it is, you can achieve the purpose.

The relationship between the first sensor 28 and the second sensor 28A is the same as the relationship between the first sensor 27 and the second sensor 27A. That is, the second sensor 27A corresponds so that the position of the first sensor 28 on the second sensor 28A can be sensed, and the position of the first sensor 27 is continuously located in the second sensor 27A. It is desirable to be able to locate or sense. But at least three positions, ie
The first sensor 28 is located near the center 28Aa of the second sensor 28A (the excavation head 20 is in a suspended state) (FIG. 1A)
The first sensor 28 is located near the right end 28Ab of the second sensor 28A (the excavation head 20 is in a small diameter excavation state) (FIG. 2 (a)),
The position where the first sensor 28 is near the left end 28Ac of the second sensor 28A (the excavation head 20 is excavating a large diameter) (FIG. 2B)
If you can grasp where it is, you can achieve the purpose.

  Accordingly, when the second sensors 27A and 28A are configured so as not to act continuously, the second sensors 27A and 28A can be configured in multiple stages such as three stages or more, five stages, and seven stages. Each sensor is a non-contact type and can operate even if the first sensor 27 and the second sensor 27A are not in contact with each other, so that even if mud is interposed between the corresponding first and second sensors, it operates without any problem.

  Further, in the case of a construction method in which it is not necessary to grasp the state where the excavation arm 20 hangs down for the purpose of using the excavation head 40, it is not necessary to grasp the positions 27Aa and 28Aa of the second sensors 27A and 28A. It is sufficient that at least two data at positions 27Ab and 27Ac (28Ab and 28Ac) can be acquired.

  (5) When the excavating arms 20, 20 swing to make a small-diameter excavation on the side surfaces 3, 3 of the head body 1, stoppers 12, 13 that restrict the maximum excavation of the excavating arm 20 are attached. The upper protruding portion 26 of the excavating arm 20 is provided, and the stopper 13 is disposed at a position where the intermediate portion 22 of the excavating arm 20 is provided.

  Further, when the excavating arms 20, 20 swing and perform large-diameter excavation, stoppers 14 that restrict the maximum excavation of the excavating arm 20 are attached to the bulging portions 5, 5 of the head body 1. Further, when the excavating arms 20 and 20 are swung to perform large-diameter excavation on the bulging portions 5 and 5 of the head body 1, the stopper 15 and the stopper 16 that restrict the maximum swinging of the excavating arm 20 are respectively attached. . The stopper 16 has a structure that protrudes and protrudes by a spring, and a stopper receiver (concave portion) 16 a that receives the protruding stopper 16 is provided on the main body side surface 20 a of the excavating arm 20.

  (6) A battery 29 for supplying power to each sensor 27, 28, 27A, 28A is built in the head body 1 (FIGS. 1A and 1B), and the battery 29 and each sensor 27, 28, 27A, Wiring is connected to 28A (not shown).

  Further, wiring for sending the output of each sensor 27, 28, 27A, 28A to the ground is provided (not shown). In this case, it is arranged along the inner wall or outer wall of the excavation rod 40 through the connecting portion 11, or is incorporated in the wall thickness of the excavation rod 40. Moreover, when connecting each excavation rod 40 and 40 up and down, an electrical joint is provided (not shown). If an accessory device that can transmit the outputs of the sensors 27, 28, 27A, and 28A wirelessly is incorporated, wiring and electrical joints are unnecessary.

  The excavation head 30 is configured as described above (FIGS. 1A to 1C).

2. Use of drilling head 30

  Subsequently, the use of the excavation head 30 of the present invention will be described.

(1) The excavating rod 40 is attached to an excavator (not shown), the connecting portion 11 of the excavating head 30 is attached to the lower end of the excavating rod 40, and the pile hole is excavated as in the conventional case. In other words, the excavation rod 40 is rotated forward at the pile hole excavation position, and the excavation arm 20 is regulated by the stoppers 12 and 13 with the tip 23 (excavation blade 25) swinging in the direction of arrow 31 due to earth pressure. The pile hole shaft portion can be excavated at a rocking angle (FIG. 2 (a)). Therefore, in this state, drilling the shaft portion 42 of the pile bore diameter D _1. At this time, the excavated soil can be transferred upward while being crushed and stirred by the stirring blades 17 and 18.

(2) At this time, data that “the first sensor 27 is at the position 27Ab on the second sensor 27A” and “the first sensor 28 is at the position 28Ab on the second sensor 28A” are sent to the ground, and the excavation diameter the D ₁ is maintained visible. Further, when data indicating that “the first sensor 27 is not located at the position 27Ab on the second sensor 27A but slightly located on the 27Aa side” is obtained during excavation, the excavation diameter is small. It shows that. Therefore, when the excavation diameter is small enough to affect the quality of the pile hole, the excavation head 30 can be moved up and down at that height to cut the pile hole wall and build a normal pile hole.

  In this case, if there is data on the load of the current value of the auger (excavator) motor that is recorded at the same time, the currently excavated layer contains obstacles such as crushed stones in the ground In addition, it can be estimated that the size of the layer can be estimated together with the data of the diameter of the pile hole.

(3) If the shaft portion 42 of the pile hole is excavated to a predetermined depth (with the formation depth of the root consolidation portion), the excavation rod 40 stops rotating, and then the excavation rod 40 is reversely rotated to excavate. The arm 20 swings in the direction indicated by the arrow 32 on the opposite side, is placed against the stopper 14 and the stopper 15, the stopper 16 is fitted into the stopper receiver 16 a, and is controlled by the stoppers 14, 15, and 16. The bottom expanded portion 43 of the pile hole can be excavated at the moving angle (FIG. 2B). In this state, drilling拡底root consolidated portion 43 of the pile hole diameter D _2. Further, the excavated soil can be crushed and stirred by the stirring blades 17 and 18.

  (4) When the excavation of the predetermined pile hole widening root consolidation part 43 is completed, the cement milk is discharged from the cement milk discharge port (the lower end surface 11 of the bulging part 8) of the excavation head 30 in the same manner as before. Agitation is performed in the root consolidation part 43 to form a root consolidation layer, and the excavation head 30 is pulled up to the ground. At this time, when the rotation of the excavation rod 40 is stopped, the excavation arm 20 is hung downward, and the pulling up is facilitated (FIG. 1B).

  At this time, data that “the first sensor 27 is at the position 27a of the second sensor 27A” and “the first sensor 28 is at the position 28a of the second sensor 28A” are sent to the ground, and the excavating arm 20 is not open. Can be grasped on the ground.

  In particular, when it is used for an excavation head for a medium excavation method, it can be confirmed that the excavation arm 20 is closed, so that when the excavation head is pulled up through the hollow portion of the hollow pile, Can be prevented (not shown).

  (5) As described above, the excavating arm 20 is in the swing range (first position) during small-diameter excavation, is in the swing range (second position) during large-diameter excavation, or hangs downward. You can see in real time whether you are in a state. Accordingly, if the length of the excavating arm 20 (the length from the horizontal axis 19 to the excavating blade 25) is taken into consideration, the excavation diameter at that depth is grasped. Can be grasped in real time and visually.

  In addition, if the data of the excavation diameter is collected over the entire length of the pile hole, the shape of the entire pile hole can be grasped, so the shape of the foundation including the pile diameter can be reported, and there is an effect of ensuring quality assurance and confirmation. . This is effective for situations where large loads are applied, such as during an earthquake.

3. Other examples

  (1) In the above embodiment, both the “first sensor 27, second sensor 27A” (intermediate portion 22 side) and “first sensor 28, second sensor 27A” (upper protrusion 26 side) are attached. Even if the sensor on either side becomes insensitive, position information can be obtained from the sensor on the other side, but it is preferable to provide only one combination of the intermediate part 22 side or the upper protrusion part 26 side. The other can be omitted (not shown).

  In this case, when only the first sensor 28 (second sensor 28A) is provided on the upper protrusion 26, the swing range of the first sensor 28 is narrower than that of the first sensor 27 (second sensor 27A). Therefore, the range of the second sensor 28A can be narrow and can be configured at low cost.

  (2) Moreover, in the said Example, although the power supply of each sensor was provided from the battery 29, it can also be supplied from the ground and in this case, the battery 29 can be abbreviate | omitted (not shown).

  (3) Further, in the above-described embodiment, if any one of “stopper 12 and stopper 13” among the stoppers for restricting the swing of the excavating arm 20 is provided, the shaft excavation diameter can be regulated. If any one of “14, stopper 15 and stopper 16 (stopper receiver 16a)” is provided, the bottom-excavated portion excavation diameter can be described (none is shown). Therefore, the other can be omitted.

  (4) Moreover, in the said Example, the motive power apparatus which assists rocking | fluctuation of the excavation arm 20 can also be integrated in the head main body 1 or the excavation arm 20 (not shown). In this case, the battery 29 can be used as a power source for the power unit.

  The current consumption A of the power unit for the excavating arms 20 and 20 is considered to increase as the ground resistance increases, and is proportional to the excavating current value B of the auger (the motor that rotates the excavating rod 40) of the excavator. Because it fluctuates, by measuring both current values A and B simultaneously and processing the data, it is possible to grasp the properties of the ground to be excavated more accurately than before if compared with N value data. Become.

(5) In the above embodiment, the swing angle of the excavating arm 20 is grasped by combining the first sensor 27 (28) and the second sensor 27A (28A). In the meantime, a mechanical or electrical angle sensor can be attached to directly measure the swing angle of the excavating arm 20 (not shown).

(A) is a front view, (b) is a right view in the Example of the excavation head of this invention. Similarly, it is a front view of a use state, (a) represents a pile hole shaft portion (small diameter) excavation, and (b) represents a pile hole widened portion (large diameter) excavation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head main body 2 Base part of head main body 5 Protruding part of head main body 9 Fixed excavation blades 12, 13, 14, 15, 16 Stopper 17 and 18 of head main body 19 Horizontal shaft 20 Excavation arm 20a Head main body side of excavation arm Surface 21 of the excavating arm 22 Intermediate portion of the excavating arm 23 End portion of the excavating arm 25 Excavating blade 26 of the excavating arm Upper projection 26a of the excavating arm Surfaces 27, 28 of the upper projecting portion on the head body side First sensor 27A, 28A Second sensor 27Aa, 28Aa Sagging position 27Ab, 28Ab of second sensor Small-diameter excavation position 27Ac, 28Ac of second sensor Large-diameter excavation position of second sensor 29 Battery 30 Excavation head 40 Excavation rod 42 Pile hole shaft 43 Expanded bottom of the pile hole

Claims (6)

In the excavation head in which the upper end portion of the excavation arm having the excavation blade at the lower end portion is swingably attached to both sides of the head main body having the connection portion with the excavation rod at the upper end portion,
A pile hole excavation head, wherein a sensor for detecting a swing angle of the excavation arm with respect to the horizontal axis is attached to the head main body or excavation arm, and data transmission means from the sensor to the ground is provided. In the excavation head in which the upper end portion of the excavation arm having the excavation blade at the lower end portion is swingably attached to both sides of the head main body having the connection portion with the excavation rod at the upper end portion,
A first sensor is attached to the head body side surface of the excavating arm,
According to the trajectory of the first sensor when the excavation arm swings, a second sensor is attached to the head body, and a position confirmation unit and a data transmission unit are provided in the excavation head or on the ground.
The position confirmation means, the first sensor or the second sensor has a function of knowing the relative position of the first sensor in the length direction of the trajectory of the second sensor;
The data transmission means has a function of transmitting information on its position data to the ground. An upper protrusion is formed at the upper end of the excavating arm, and the first sensor is attached to the lower part of the horizontal axis and the upper protruding part, respectively, with the excavating arm, and a second corresponding to the first sensor on the head body. 3. The pile hole excavation head according to claim 2, wherein sensors are attached respectively. The hole drilling head according to claim 1 or 2, wherein a power source for operating each sensor is accommodated in the head main body or the drilling arm. 2. A power unit is connected to a horizontal shaft, and the power unit has a function capable of forcibly swinging by selecting an excavation arm on one side or both sides. Or the pile hole excavation head of 2 description. In the excavation head in which the upper end portion of the excavation arm having the excavation blade at the lower end portion is swingably attached to both sides of the head main body having the connection portion with the excavation rod at the upper end portion,
(1) A reference point is set on the surface of the head body with the excavating arm, a swing range is set on the head body corresponding to a swing locus of the reference point,
(2) By acquiring position information where the reference point is located within the swing range,
(3) Check the swing angle of the excavating arm.
A method for confirming a position of an excavation arm of a pile hole excavation head.

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