JP4753972B2 - Widened bucket - Google Patents

Description

  The present invention relates to a bottom expansion bucket for expanding and excavating the bottom of a vertical hole excavated by an earth drill.

  When excavating a vertical hole for foundation pile construction with an earth drill, after excavating a vertical hole with a diameter determined by the bucket size to a predetermined depth by an axial excavation bucket attached to the lower end of the kelly bar, the axial excavation bucket The bottom of the hole is expanded into a taper shape by exchanging with a bottom expansion bucket. The widened bucket is, for example, as disclosed in Patent Document 1 and as shown in FIGS. 13 and 14, a main scraper 3 attached so as to be openable and closable horizontally around a plurality of vertical axes 2 provided around the bucket body 1. And an auxiliary scraper 5 attached to the tip of the main scraper 3 so as to be pivotable in the horizontal direction about the longitudinal axis 4 and a bottom expansion wing 10 for bottom expansion excavation. The main scraper 3 and the expanded bottom blade 10 are connected by a link 6 and pins 7 and 8. The widened wing 10 is attached to a support arm (not shown) that can rotate about the longitudinal axis 2, and is attached so as to be able to protrude and retract from a trunk portion 9 that constitutes the bucket body 1. The support arm is rotated by a hydraulic cylinder (an expanded cylinder) (not shown). The widened wing 10 has a cutter 10a at its tip. Further, the bottom expanding wing 10 has arcuate guide frames 10b and 10c for allowing the bottom expanding wing 10 to appear and disappear without rattling and preventing earth and sand from leaking between the bottom expanding wing 10 and the body 9. Reference numeral 11 denotes a bottom lid that opens for discharging after lifting the bucket to the ground.

  When performing bottom expansion excavation with this bottom expansion bucket, the bucket body 1 is rotated in the direction of arrow 13 while the bottom expansion blade 10 is pushed outward by the bottom expansion cylinder as indicated by arrow 12 (see FIG. 13). During the excavation, as shown by a two-dot chain line, the bottom expanding blade 10 is gradually pushed outward, and in conjunction with the pushing, the main scraper 3 is pushed outward by the link 6, and the bottom expanding blade 10 The side wall of the vertical hole is excavated, and the excavated earth and sand are introduced into the bucket from the space 14 between the auxiliary scraper 5 and the expanded wing 10. During the bottom excavation, the auxiliary scraper 5 is rotated inward as indicated by an arrow 15 by the pressure of earth and sand introduced into the bucket and contact with the ground, and during the excavation, the auxiliary scraper 5 and the auxiliary wing 10 are auxiliary. The gap 14 between the scraper 5 and the scraper 5 is expanded.

  When closing the bucket, the widened wing 10 is moved in the direction opposite to the arrow 12 while the bucket is rotated in the direction of the arrow 13 as in the excavation, and the bucket is closed. The main scraper 3 moves in the closing direction in conjunction with the movement of the bottom expanding blade 10 in the closing direction. At this time, the main scraper 3 plays a role of scraping earth and sand at the bottom thereof into the bucket body 1.

  In the final stage of the closing operation, a stopper 16 is fixed to the bucket body 1 by welding or the like in order to prevent the earth and sand taken into the bucket from leaking from between the bottom expanding blade 10 and the auxiliary scraper 5 to the outside of the bucket. Yes. Then, immediately before the main scraper 3 is closed, the auxiliary scraper 5 is applied to the stopper 16 and returned to the closed position indicated by a solid line. Thus, the posture of the auxiliary scraper 5 is corrected immediately before the main scraper 3 is closed, and the gap between the bottom expanding blade 10 and the auxiliary scraper 5 is closed.

JP 2000-274176 A

  In the bottom expansion bucket provided with the auxiliary scraper 5 as in Patent Document 1, when the bottom expansion layer at the construction site is a gravel layer or a clay layer, the bottom expansion blade 10 and the main scraper 3 may not be closed. That is, as shown in FIG. 15, the excavated material 17 such as gravel is sandwiched between the auxiliary scraper 5 and the expanded wing 10, and the closing operation is performed while the auxiliary scraper 5 is prevented from rotating inward by the stopper 16. If the drilling is performed, the excavated material 17 is consolidated, and the main scraper 3 and the bottom expanded blade 10 cannot be closed. As a result, the bottom expanding blade 10 or the main scraper 3 remains in a state of protruding from the outer diameter of the bucket indicated by 19, so that there is a problem that the bucket cannot be pulled up.

  In view of the above problems, an object of the present invention is to provide a bottom expansion bucket having a configuration capable of smoothly closing a bottom expansion blade and a main scraper regardless of the soil quality of the bottom of a vertical hole.

The widened bucket according to the present invention has a main scraper attached to the bucket body so as to be openable and closable around a plurality of longitudinal axes, and is pivoted horizontally around the longitudinal axis at the tip of the main scraper. An auxiliary scraper that can be attached to the main scraper, and a bottom wing that is attached to the main body of the bucket body so as to be able to protrude and retract and performs bottom expansion excavation, and is attached to the bucket body. In the widened bucket provided with a stopper that abuts the auxiliary scraper immediately before closing and closes between the widened blade and the auxiliary scraper,
Means is provided for adjusting an angle by which the auxiliary scraper can be turned inside the bucket by the stopper.

  In the bottom expansion bucket of the present invention, when the soil quality of the bottom expansion portion is gravel or clay that the excavated material is likely to be caught between the bottom expansion blade and the auxiliary scraper, the angle that can be turned to the inside of the auxiliary scraper when the bucket is fully closed Increase As a result, the occurrence of a situation where the excavated material is pinched and compacted between the bottom expanding blade and the auxiliary scraper immediately before the bucket is fully closed is avoided, and the bucket can be smoothly closed.

  FIG. 1 is a side view showing an embodiment of a bottomed bucket according to the present invention, and FIG. 2 is an EE enlarged sectional view thereof. 1 and 2, reference numeral 20 denotes a central axis connected to a Keriba (not shown) via a stabilizer (not shown) for preventing runout during excavation, and a vertical frame is formed below the central axis 20. 21 is fixed. A horizontal frame 22 protruding laterally is fixed to the vertical frames 21 in multiple stages. The vertical axis 2 is attached to both ends of each horizontal frame 22. In this example, two vertical axes 2 are provided. Reference numeral 24 denotes a bottom expansion cylinder including a hydraulic cylinder provided as an opening / closing device for opening and closing the bottom expansion blade 10. The bottom expansion cylinder 24 is attached between a support arm 25 that is rotatably attached to the longitudinal axis 2 and an end of the lateral frame 22 that is opposite to the attachment side of the support arm 25.

  The body part 9 which accommodates earth and sand is fixed to the lower part of both ends of the horizontal frame 22. The bucket body 1 is constituted by the central shaft 20, the vertical frame 21, the horizontal frame 22, and the body portion 9. In the present embodiment, as shown in FIG. 1, the bottom expansion blade 10 constitutes a plurality of bottom expansion blades together with the upper bottom expansion blade 30. The bottom expanded wing rotates the bottom expanded wing 10 so that the upper expanded wing 30 is also interlocked via the linkage portion 31. By adopting such a structure, it is possible to reduce the range of rotation when closing the upper expanded wing 30. As a result, it is possible to accommodate the bottom wings 10 and 30 in a narrow space.

  3 is a side view showing the lower part of the bottomed bucket, FIG. 4 is an FF enlarged sectional view of FIG. 1, and FIG. 5 is a GG enlarged sectional view of FIG. The configurations 3 to 11 are as described with reference to FIGS. In FIG. 5, when the bottom expanding blade 10 is opened as shown by the arrow 12, the main scraper 3 is also opened in the direction of the arrow 12 by the link 6, and the auxiliary scraper 5 is rotated in the direction of the arrow 15 by the pressure of earth and sand and the resistance of the ground. Then introduce the earth and sand into the bucket. On the contrary, when the bottom expanding blade 10 closes in the direction opposite to the arrow 12, the main scraper 3 rotates in the direction opposite to the arrow 12 and accommodates the earth and sand remaining in the main scraper 3 and the auxiliary scraper 5 in the bucket.

  A first guide plate 10b whose planar shape forms an arc shape is fixed by welding or the like on the opposite side of the cutter 10a at the tip of the expanded wing 10, that is, the rear part. Between the first guide plate 10b and the body portion 9, a second guide plate 10c having an arc shape in plan view is provided on the guide portions provided on the first guide plate 10b, the second guide plate 10c and the body portion 9, respectively. It is slidably combined along. FIG. 6 shows a state in which the bottom wing 10 is most opened.

  7 is a partially enlarged view showing the mounting portion of the stopper 32 in FIG. 4, FIG. 8A is a longitudinal sectional view showing the mounting portion of the stopper 32, and FIG. 8B is a cross-sectional view taken along the line HH in FIG. FIG. 4, 7, and 8, 33 and 34 are horizontal plate portions welded to the inner surface of the arc-shaped outer peripheral plate 35 constituting the bucket body 1. Reference numerals 36 and 37 denote insertion slits for the stopper 32 provided in the horizontal plate portions 33 and 34. These slits 36 and 37 intersect two grooves 36a and 36b so that the contact position of the auxiliary scraper 5 of the stopper 32 can be changed as representatively shown for the slit 36 in FIGS. It is formed in an X shape. Similarly, the slit 37 has a shape in which two grooves are combined in an X shape.

  As shown in FIG. 9, the stopper 32 has a plate shape, and has a handle 32a and a drop-preventing flange 32b at the top. A groove 32c is formed under the handle 32a. The stopper 32 is inserted into the groove 36a or 36b of the slit 36 of the horizontal plate portion 33 and the groove 36a or 36b of the slit 37 of the horizontal plate portion 34 from above, and the flange portion 32b is inserted into the groove 36a or 36b. Set it on the edge of. Then, the retaining plate 39 is inserted into the groove 32c below the handle 32a, and both ends of the retaining plate 39 are fixed to the receiving seat 41 with bolts 40, so that the stopper 32 is prevented from coming out upward and the lateral plate portion. Fix to 33.

  In the case of performing bottom expansion excavation using this bottom expansion bucket, the soil quality at the bottom of the vertical hole can be known by observing the last excavation soil of the vertical hole excavated by a shaft excavation bucket (not shown). When the soil is sand or silt, the sand or silt has fluidity, so that there is no possibility of clogging between the expanded wing 10 and the auxiliary scraper 5. For this reason, the stopper 32 is inserted into the groove 36a when the bucket is closed. As described above, in a state where the stopper 32 is inserted into the groove 36 a, the stopper 32 is at a position that protrudes to the outermost side with respect to the auxiliary scraper 5. For this reason, as shown in FIG. 10, in the fully closed state of the bucket, the gap G <b> 1 between the auxiliary scraper 5 and the widened blade 10 becomes small.

  When the soil at the bottom of the vertical hole is clay, the stopper 32 is inserted into the groove 36b. Thus, in the state where the stopper 32 is inserted into the groove 36b, the stopper 32 is on the inner side than the state where the stopper 32 is inserted into the groove 36a as shown in FIG. For this reason, as shown in FIG. 11, when the bucket is fully closed, the angle at which the stopper 32 can turn inward with respect to the auxiliary scraper 5 becomes large, and the clearance between the auxiliary scraper 5 and the bottom expanded blade 10 when fully closed is reached. G2 becomes larger than in the case of FIG. For this reason, it is possible to avoid a situation in which the clay is consolidated by the gap G2 between the auxiliary scraper 5 and the bottom expanding blade 10 and the bucket is not closed.

  If the soil at the bottom of the vertical hole is gravel, the stopper 32 is removed. Thus, in a state where the stopper 32 is removed, as shown in FIG. 12, the auxiliary scraper 5 can rotate inward until it abuts against the link 6 when the bucket is fully closed. For this reason, the gap G3 between the auxiliary scraper 5 and the bottom expanded blade 10 when fully closed is larger than in the case of FIG. For this reason, it is possible to avoid a situation in which the gravel is consolidated by the gap G3 between the auxiliary scraper 5 and the bottom expanding blade 10 and the bucket is not closed.

  When the present invention is carried out, the rotation adjustment angle of the auxiliary scraper 5 by the stopper 32 may be two stages, but the soil quality can be adjusted to three stages or more than three stages as in the present embodiment. A more suitable angle can be selected. Further, the adjustment of the rotation angle of the auxiliary scraper 5 of the present invention may be performed continuously using, for example, an eccentric cam mechanism or a slide mechanism. Furthermore, instead of adjusting the attachment of the stopper 32 itself, the stopper 32 is fixedly attached to the bucket body 1, while the position of the contact portion of the auxiliary scraper 5 with respect to the stopper is adjusted to the inside of the auxiliary scraper 5. You may make it adjust the rotation angle of.

It is a side view which shows one Embodiment of the bottom expansion bucket by this invention. It is EE expanded sectional drawing of FIG. It is a side view which shows the lower structure of the bottom expansion bucket of this Embodiment. It is FF expanded sectional drawing of FIG. It is GG expanded sectional drawing of FIG. It is a cross-sectional view which shows the most open state of the bottom expansion bucket of this Embodiment. It is a top view which shows the stopper insertion groove | channel of this Embodiment. (A) is a longitudinal cross-sectional view which shows the attachment structure of a stopper, (B) is HH sectional drawing of (A). It is a front view of the stopper of this Embodiment. In this Embodiment, it is a top view which shows the state which made the rotation angle to the inner side of an auxiliary | assistant scraper the smallest. In this Embodiment, it is a top view which shows the state which made the rotation angle to the inner side of an auxiliary | assistant scraper larger than FIG. In this Embodiment, it is a top view which shows the state which made the rotation angle to the inner side of an auxiliary | assistant scraper the largest. It is a cross-sectional view of a conventional bottomed bucket. It is a side view of the conventional bottom expansion bucket. It is a cross-sectional view explaining the problem of the conventional bottom expansion bucket.

Explanation of symbols

1: Bucket body, 2: vertical axis, 3: main scraper, 4: vertical axis, 5 auxiliary scraper, 6: link, 9: trunk, 10: bottom wing, 11: bottom lid, 20: central axis, 21: Vertical frame, 22: Horizontal frame, 24: Bottom expansion cylinder, 25: Support arm, 30: Bottom expansion blade, 31: Linking portion, 32: Stopper, 33, 34: Horizontal plate portion, 35: Vertical plate portion, 36, 37: Slit, 36a, 36b: groove, 39: retaining plate, 40: bolt, 41: seat

Claims (1)

A main scraper attached to the periphery of the bucket body so as to be openable and closable around the vertical axis, and an auxiliary scraper attached to the tip of the main scraper so as to be pivotable around the vertical axis. The main scraper is connected to the main scraper by a link, and is attached so as to be able to protrude and retract from the trunk portion constituting the bucket body, and a widened wing for performing widening excavation, and attached to the bucket body, and the auxiliary scraper is attached immediately before the bucket is fully closed. In the bottom expansion bucket provided with a stopper that closes between the bottom expansion wing and the auxiliary scraper by contacting,
A bottom expansion bucket, comprising means for adjusting an angle of the auxiliary scraper that can be rotated to the inside of the bucket by the stopper.

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