JP2008208599A - Auger device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auger device capable of preventing a following auger device from colliding against a core member of a preceding element and not only reducing vibration and noise but also improving efficiency of excavation and precision of construction. <P>SOLUTION: In this auger device, a continuous circular ring-like auxiliary ring 4 is arranged coaxially with a shaft body 2 provided with an excavation head 3 at a tip of a lower part in a halfway section of the shaft body. The auxiliary ring 4 is fixed on the shaft body 2 by a plurality of oblique members 5 being obliquely and upward inclined toward the shaft body 2 from the auxiliary ring 4 in an upper part of the auxiliary ring 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an auger device used for excavating a vertical hole in the ground in construction or civil engineering work.

  For example, when constructing a retaining wall in the ground, a vertical hole is excavated on the ground using an auger device, and the inside of this vertical hole is made into soil cement and a core material using H-shaped steel is used as a leading element, After constructing such preceding elements at regular intervals, constructing a continuous mountain retaining wall by constructing a succeeding element connected to the preceding element between the preceding elements.

  There is a method of construction using such a single-axis auger device and a multi-axis auger device such as three-axes for the construction of such a retaining wall. After constructing each element at regular intervals, a succeeding element is constructed in the middle between the preceding elements.

  Moreover, the latter construction using a multi-axis auger device is to construct three preceding elements at the same time, and to construct three subsequent elements between each preceding element. Compared to a single-axis auger device Construction efficiency is improved.

  Conventionally, a single-shaft auger device that excavates a vertical hole for the construction of a retaining wall as described above has a structure in which a drilling head is provided at the tip of a shaft body and a stirring blade is provided on an outer peripheral surface, and is rotated by a driving device. By giving, it excavates in the ground, and in the case of a multi-axis auger device, a plurality of them rotate in conjunction with each other.

  By the way, in both the single-axis auger device and the multi-axis auger device, depending on the construction accuracy of the preceding element, the auger device of the trailing excavation comes into contact with the core material of the preceding element, which causes noise and vibration, There is a problem that the drilling efficiency is reduced or the preceding element is damaged.

  Therefore, in order to solve the above-described problems, an object of the present invention is to attach an auxiliary ring coaxial with the shaft body in the middle of the shaft body provided with the excavation head at the tip. It is an object of the present invention to provide an auger device that can prevent a trailing auger device from colliding with a core material of a preceding element, reduce vibration and noise, and improve excavation efficiency and construction accuracy.

  In order to solve the above-described problems, the present invention provides an auxiliary ring that is coaxial with the shaft body in the middle of the shaft body provided with a drilling head at the tip, and the auxiliary ring is provided with the auxiliary ring. In the upper part, a configuration is adopted in which the shaft body is fixed with a plurality of slant members inclined obliquely upward from the auxiliary ring toward the shaft body.

  The auxiliary ring has a continuous annular shape, and a drilling head is provided on the lower edge side of the auxiliary ring, or the auxiliary ring is divided into a plurality of ring components along the circumferential direction. It can be set as the structure by which the structural member is being fixed to the shaft with the diagonal material, respectively.

  Here, in the case of a 3-axis multi-axis auger device, the central auger device has different rooting lengths depending on conditions such as excavation depth and ground properties. The length of the auger used on both sides varies depending on the excavation depth of the ground and the building, so it is set to the required length in the same manner as above, and an auxiliary ring is provided at the tip of the auger device on both sides. Yes.

  This auxiliary ring prevents the auger device for the subsequent construction from colliding with the core material of the preceding element when the subsequent element is constructed between the preceding elements.

  In addition, the diagonal material that fixes the auxiliary ring to the shaft is slanted at the top of the auxiliary ring and is hollow inside the auxiliary ring. The clogging is less likely to clog, and the diagonal material increases the effective area of the upper part of the auxiliary ring, making it easier to waste soil and improving excavation efficiency.

  According to the present invention, since the auxiliary ring that is coaxial with the shaft body is attached in the middle of the shaft body provided with the excavation head at the tip, when constructing the succeeding element between the preceding elements, The auger device can be prevented from colliding with the core material of the preceding element, and not only noise and vibration can be reduced, but also construction accuracy can be easily ensured.

  In addition, the diagonal material that fixes the auxiliary ring to the shaft is slanted at the upper part of the auxiliary ring, so that the inside of the auxiliary ring is hollow, and when the auger device rotates and enters the ground, It becomes difficult to clog the earth and sand, and by rotating the diagonal material, the upper effective area of the auxiliary ring can be widened, and the earth and sand can be easily discarded and clogged, thereby improving excavation efficiency.

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

  As shown in FIGS. 1B and 1C, the auger apparatus 1 is provided with a drilling head 3 at the tip of a shaft body 2 using a steel pipe, and is coaxial with the shaft body 2 in the middle of the shaft body 2 on the tip side. The auxiliary ring 4 is arranged, and the auxiliary ring 4 is composed of a plurality of diagonal members 5 that are inclined upwardly from the auxiliary ring 4 toward the shaft body 2 at the upper portion of the auxiliary ring 4. It has a fixed structure.

  The shaft body 2 uses a steel pipe of a required length, the excavation head 3 is provided at the lower end, the stirring blade 6 is provided at the outer surface of the intermediate part, the connecting member 7 is fixed to the upper end part in an extended shape, and the auxiliary ring 4 is provided at the upper part. Installed in position.

  The auxiliary ring 4 is formed in an annular shape having an outer diameter corresponding to the diameter of a hole to be excavated, a drilling blade 8 protruding downward is provided on the lower edge side, and the diagonal member 5 is welded to the auxiliary ring 4 at one end. By fixing and welding the other end to the shaft body 2, the inclined ring 5 is arranged at an upper portion of the auxiliary ring 4, and the inclination angle of the diagonal member 5 may be set arbitrarily, such as 45 °.

  FIG. 2 shows another example of the auxiliary ring 4 attached to the shaft body 2. The auxiliary ring 4 is divided into a plurality of ring constituent members 4a along the circumferential direction, and each of the divided ring constituent members 4a is inclined. The ring constituting member 4a which is fixed to the shaft body 2 by the material 5 and has an arcuate shape is positioned such that the front end side in the rotational direction is slightly inward with respect to the counterclockwise rotation in FIG. Even if it contacts with the core material mentioned later, it is set as planar arrangement | positioning and rotation is obtained smoothly.

  FIG. 1A shows an example in which the auger device 1 is adopted in a three-axis multi-axis auger device 9 used for constructing a retaining wall. A long auger 11 at the center is provided below a casing 10 housing a speed reduction mechanism. Short augers 12 located on both sides thereof are provided, and the augers 11 and 12 are driven to rotate by a motor 13 on the casing 10.

  The central long auger 11 has a length obtained by adding the depth of rooting to the depth from the ground to the root cutting bottom, and the short augers 12 on both sides have a long excavation length from the ground to the root cutting bottom. 11, a drilling head 14 is provided at the tip, and the drilling head 14 of the long auger 11 has a discharge port 15 for discharging cement milk supplied from the upper end of the auger 11 through the shaft, and in the middle of the shaft portion. Cement milk and excavated soil are agitated and mixed during rotation by an appropriate agitating blade 16 provided.

  The auger device 1 of the present invention is used for the short augers 12 on both sides, the stirring blades 6a are provided on the outer surface of the extension shaft body 2a connected to the upper part, and the auxiliary ring 4 is provided in the excavation hole by the excavation head 14 of the long auger 11. The distance between the long central auger 11 and the short augers 12 on both sides is set so as to wrap.

  The cement milk is discharged only by the central long auger 11, but the cement milk discharged from the central long auger 11 gradually rises upward as the drilling progresses. The portion of the hole drilled by the auger 12 is filled.

  Next, an example of a method for constructing a retaining wall using the three-axis multi-axis auger device 9 will be described.

  As shown in FIG. 1 (a), the central auger 11 in the triple auger device 9 has a depth obtained by adding the rooting length to the depth from the ground to the root cutting bottom, and the augers 12 on both sides are root cut from the ground. With the excavation length to the bottom, as shown in the process diagram of Fig. 3 (a) to (e), arrange the three auger devices 9 attached to the pile driver vertically to the position where you want to construct the retaining wall. While the augers 11 and 12 are rotated by starting the motor 13, first, the longitudinal holes 17 are excavated to the root by the long central auger 11, and the core material roots are continuously excavated by the central auger 11 and the augers 12 on both sides. The three vertical holes 19 are excavated by excavating the vertical holes 18 between the insertion portion and the cores 20.

  When excavating the vertical holes 17 and 18 by the augers 11 and 12, cement milk (cement-based suspension composed of cement + bentonite + water + admixture) from the discharge port 15 provided in the tip head 14 of the central auger 11. And the mixture is mixed with soil by means of a stirring blade 16 so that the inside of the triple vertical hole 19 is made into a soil cement shape, the triple vertical hole 19 having a predetermined depth is excavated and the auger device 9 is extracted. A unit wall (element) 21 is formed by embedding a core material 20 using H-shaped steel in a deep vertical hole 17 at the center.

  Incidentally, the central auger 11 in the triple auger device 9 has an excavation diameter of 550 mm or more, the augers 12 on both sides have an excavation diameter of 550 mm, and the outer diameter of the auxiliary ring 4 is set to 550 mm. The distance between the auger 11 and the augers 12 on both sides is set to 450 mm, and the deep vertical holes 17 excavated by the central auger 11 and the shallow vertical holes 18 excavated by the augers 12 on both sides are partially overlapped in a plane. The triple vertical hole 19 can be excavated.

  Next, as shown in FIGS. 4 (f) and 4 (g), by arranging the triple vertical holes 19 in such a manner that the shallow vertical holes 18 overlap with each other between the triple vertical holes 19 as described above, As shown in FIG. 5, the continuous retaining wall 22 can be constructed with the solid soil cement of each unit wall 21, and the upper half of the shallow vertical hole 18 and the long vertical hole 17 has a depth to the root cutting bottom. The soil cement mountain retaining wall 22 is formed, and the lower half of the long vertical hole 17 is a root portion for supporting the core member 20.

  Here, in the construction of the unit wall 21 by the triple vertical hole 19, the interval between the core members 20 is about 900 mm to about 1200 mm depending on the construction conditions and the like, the auger diameters of the augers 11 and 12 are 550 mm, the augers 11 and 12 Several construction orders can be employed under the condition that the interval of 450 mm is 450 mm.

  FIG. 6 is a construction example in the case where the interval W between the core members 20 is 900 mm. As the preceding construction shown in the upper part of the figure, the three vertical holes 19 and the unit walls 21 formed by the core members 20 are arranged at a pitch of 1800 mm. Then, the unit wall 21 is constructed by the triple vertical holes 19 and the core material 20 between the adjacent unit walls 21 as a subsequent construction indicated by a one-dot chain line in the middle of the figure.

  In the subsequent construction, the shallow vertical holes 18 on both sides just overlap the shallow vertical holes 18 in the preceding construction, and the augers 12 on both sides only need to knead the previous soil cement, and when the subsequent construction is completed, FIG. As shown in the lower part, a continuous mountain retaining wall 22 in which the distance between the core members 20 is 900 mm is completed with soil cement.

  In the subsequent construction, when the excavation head 3 of the short auger 12 on both sides is constructed such that the unit walls 21 are arranged side by side so that the shallow vertical holes 18 overlap as shown in FIGS. However, it is possible to prevent the short auger 12 from coming into contact with the core member 20 embedded in the deep vertical hole 17 of the unit wall 21 which has been previously constructed, thereby causing breakage or the like.

  Thereby, when excavating the triple vertical hole 19, when the shallow vertical hole 18 is constructed in a wrap shape, the rotation of the short auger 12 can be maintained even if the auxiliary ring 4 may come into contact with the core material 20. , There is no trouble caused by collision with the core material 20, noise and vibration can be reduced, the short augers 12 on both sides do not hit the core material, it is easy to ensure construction accuracy, the excavation accuracy is improved and shallow Since the lap construction of the vertical hole 18 can be performed reliably, the soil cement is connected, and the retaining wall 22 that can withstand earth pressure and water pressure can be constructed.

  In addition, since the diagonal member 5 for attaching the auxiliary ring 4 to the short augers 12 on both sides is inclined at the upper part of the auxiliary ring 4, earth and sand inside the auxiliary ring 4 that becomes a cavity when rotating into the ground. Clogging is difficult to occur, and the diagonal member 5 rotates on the upper part of the auxiliary ring 4, so that the effective area for drilling can be widened and the soil can be easily discharged upward. As a result, the drilling efficiency is improved.

  In addition, as for the combination of preceding construction and subsequent construction, an arbitrary order can be adopted in addition to the construction order as shown by the numbers in FIG.

  Further, in the illustrated example, the auger apparatus 1 is shown as being used for a triple auger apparatus 9, but this auger apparatus 1 can be used with a single-axis auger apparatus, and can be used not only for the construction of mountain retaining walls but also for the ground surface. It can be widely used for drilling holes.

(A) is a front view showing a triple auger device using the auger device of the present invention, (b) is an enlarged front view showing the auger device of the present invention, and (c) is a cross-sectional plan view thereof. (A) is a perspective view which shows the other example of the auxiliary | assistant ring in the auger apparatus of this invention, (b) is the longitudinal cross-sectional front view, (c) is a cross-sectional top view which shows the relationship between an auxiliary | assistant ring and a core material. (A) thru | or (e) are process drawings of the first half which show the construction process of the unit wall by a triple vertical hole in order. (F) thru | or (g) are process drawings of the latter half which show the construction process of the unit wall by a triple vertical hole in order. (A) is a partially cut front view of the constructed retaining wall, (b) is an enlarged cross-sectional view taken along arrow bb in (a). Plan view showing an example of the construction order of unit walls by the pitch of the core material and triple vertical holes

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Auger apparatus 2 Shaft body 3 Excavation head 4 Auxiliary ring 5 Diagonal material 6 Stirring blade 7 Connecting member 8 Excavation blade 9 Multiaxial auger apparatus 10 Casing 11 Long auger 12 Short auger 13 Motor 14 Excavation head 15 Discharge port 16 Stirring blade

Claims (3)

  An auxiliary ring that is coaxial with the shaft body is arranged in the middle of the shaft body provided with the excavation head at the tip, and the auxiliary ring is obliquely upward from the auxiliary ring toward the shaft body at the upper portion of the auxiliary ring. The auger device fixed to the shaft body with a plurality of diagonal members having an inclined shape.   The auger apparatus according to claim 1, wherein the auxiliary ring has a continuous annular shape, and a drilling head is provided on a lower edge side thereof.   The auger device according to claim 1 or 2, wherein the auxiliary ring is divided into a plurality of ring constituent members along a circumferential direction, and each of the divided ring constituent members is fixed to the shaft body by diagonal members.

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