JPH0448160B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a bucket for dredging the bottom when constructing cast-in-place concrete foundation piles, and a bottom for discharging earth, sand, slime, etc. remaining in the excavated underground hole. Regarding dredged buckets.

Conventional technology In general, when drilling an underground hole for a cast-in-place pile, it is necessary to sufficiently remove the sludge (earth and sand) and slime remaining on the hole wall and bottom to obtain a cast-in-place pile with high bearing capacity. It is well known in the art that this is not possible.

Conventionally, the methods for removing residual soil and slime from excavated underground holes include the bucket method, the suction pump method using tremie,
Air lift systems and submersible suction pump systems are known.

By the way, in the bottom-expanding method in which the bottom of an underground hole is widened and excavated, the shaft hole diameter at a predetermined height from the bottom of the hole is equal to the shaft hole diameter at a height from the predetermined height to the ground surface. The cast-in-place pile has an enlarged root and has a high bearing capacity.

Therefore, a bucket has been provided which enables dredging of the bottom of a hole excavated by the bottom-expanding method and cleaning of the surrounding wall (see Japanese Utility Model Application Publication No. 59-489).

Problems to be Solved by the Invention However, according to the invention described in the above-mentioned publication, when the bucket body is pulled up from the underground hole after bottom dredging work, the bucket body may not rotate for some reason. In that case, there is a very high possibility that the hole wall cutter will open inadvertently and spill the dirt, etc. taken inside, into the underground hole.
Therefore, the efficiency of bottom dredging work is impaired.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a bottom dredging bucket having means for locking the hole wall cutter from being opened inadvertently when the bucket main body is pulled up.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a bottom dredging bucket, in which a rotatable scraper having a rotation center parallel to the axis is provided on the bucket body, and The scraper opens and closes by the rotational force and thrust of the central axis of the bucket main body, which is connected to the scraper, using the resistance of the ground surface of the openable bottom lid as a reaction force, allowing it to take in and discharge dirt, etc. from outside the bucket main body. In a bucket bag with a deep bottom, a sleeve that is inserted through and supports the central shaft in an axially movable and rotatable manner is fixed to the bucket main body, and when the central shaft moves downward in the axial direction, engagement with the sleeve is prevented. A bucket belt with a deep bottom is provided, which is characterized in that it is provided with a lock portion that engages with the sleeve when the bucket is released and moved upward in the axial direction.

Function Since the present invention has the above-mentioned configuration, by inserting the bucket main body into the underground hole and rotating it in the opposite direction, the opening/closing scraper remains in the closed state and the dirt and sand remaining on the hole bottom are removed from the bottom cover. When the slime is taken into the bucket body and rotated in the forward direction, the opening/closing scraper opens outward from the bucket body at a certain angle, and its end rotates close to the hole wall, scraping the remaining dirt near the hole wall into the bucket body. When the bottom dredging work is completed and the bucket main body is reversely rotated and pulled up from the bottom of the hole, the opening/closing scraper is closed and locked from opening due to internal pressure. When the bucket main body is pulled out from the underground hole, it is moved onto a dump truck or the like, the bottom cover is opened, and the earth and sand inside the bucket main body are removed.

Embodiments The present invention will be described below with reference to illustrated embodiments. Figure 1 is a partially cutaway perspective view, Figure 2 is a front view, Figure 3 is a sectional view taken along line A-A in Figure 2, Figure 4 is a plan view, and Figure 5 is a cross-section taken along line B-B in Figure 4. 6 is an external view of the bottom cover, FIG. 7 is an internal view of the bottom cover, and FIGS. 8 and 9 are action explanatory views.

As shown in FIG. 1, the bucket main body 1 is a bottomed cylindrical body with an open top, two opening/closing scrapers 2 facing each other in the diametrical direction on the sides, and a bottom wall 3 connected to the bottom wall 3 so as to be openable and closable. be. A support plate 5 is provided in the upper opening 4 of the bucket main body 1 in the diametrical direction, and a sleeve 6 is fixed to the support plate 5 so as to be located at the axial center of the bucket main body 1.
A shaft having a Kelly bar connecting portion 7 on its upper part is rotatably fitted into the shaft. The Kelly bar connecting portion 7 has a hole 8 for inserting a Kelly bar and a pin insertion hole 9 at its upper end, and stopper arms 10, 10 are provided on the support plate 5 and protrude from each other in the diametrical direction.
are integrally formed, and the lower part of the shaft passing through the sleeve 6 and the lower part of the sleeve 6 have lock parts 11 which can be engaged and detached. the stopper arm 10;
A stopper 12 that is fixed to the support plate 5 and can be adjusted forward and backward is disposed facing within the rotational trajectory of the bracket 10. It consists of Further, the lock portion 11 includes a cutout portion 13 formed in the sleeve 6 and a protrusion 14 protruding from the Kelly bar connecting portion 7 (shaft).

On the other hand, arms 15, 15 extending in the diametrical direction are attached to the lower end of the Kelly bar connecting portion 7 (shaft), and links 16, 16 are attached to the ends of these arms 15, 15, and rotate around shafts 17, 17. These links 16, 16 are connected to the opening/closing scrapers 2, 2 with brackets 18, 18 and the shaft 1.
9 and 19. The opening/closing scrapers 2, 2 are attached to the bucket main body 1 at hinge parts 20, 20.
It is connected so that it can be opened and closed. In FIG. 3, reference numeral 21 denotes a stop plate fixed to the inner surface of one side of the opening/closing hole 22 to prevent the free end of the opening/closing scraper 2 from entering the bucket main body 1.

Further, as shown in FIGS. 6 and 7, the bottom lid 3 is connected to the bucket main body 1 via a hinge portion 23 so as to be openable and closable downward, and has fan-shaped fan-shaped openings facing each other in the diametrical direction. It has openings 24, 24. A check lid 25 is connected to the opening 24 on the inner surface of the bottom lid 3 so as to be openable and closable via a hinge portion 26 .
A blade 27 is provided on one side in the radial direction on the outer surface of the blade 27.
is slanted and protrudes. The blade 27 is used to draw earth and sand from the bottom of the hole into the bucket main body 1 on the reverse rotating shaft of the bucket main body 1.

Note that depending on the state of the slime and the state of the hole bottom, this blade 27 may not exist, that is, may only have an opening.

In order to enable the bottom cover 3 to be opened and closed, a lock recess 28 is attached to the inner surface of the bottom cover 3, and a lock rod 29 that can be engaged with and detached from the lock recess 28 is provided on the bucket main body 1. Lock recess 28
is a box-shaped body having a locking hole 30 on its upper surface, which is an integrally formed center hole and a hole projecting in the diametrical direction in the form of wings, and as shown in FIG. 5, the locking rod 29 has a locking hole 30 at its lower end. It has a stopper part 31 having a cross section of the same shape. The locking rod 29 extends vertically upward through a support portion 32 protruding from the inner wall of the bucket main body 1 near the bottom wall 3 of the bucket main body 1, and rotatably penetrates the support plate 5 so that the upper end thereof is connected to the support plate 5. It is bent in a substantially horizontal direction, and a coil spring 33 is elastically mounted between this end and the support plate 5, as shown in FIG. 4, for urging the locking rod 29 to rotate.

Next, the operation of the above embodiment will be explained. As shown in FIG. 8, after excavating the underground hole 34, the bucket main body 1 is attached to the lower end of the Kelly bar 35.
The lower end of the Kelly bar is inserted into the hole 8 of the Kelly bar connecting portion 7, and the pin 36 is inserted into the pin insertion hole 9 to connect the Kelly bar so that it cannot be removed. Next, the Kelly bar is moved to insert the bucket main body 1 into the underground hole 34, and the Kelly bar 35 is lowered to make the bucket main body 1 land on the earth and sand at the bottom of the hole, and on the slime 38. Next, the 9th
As shown in the figure, when the bucket main body 1 lands on the hole bottom 37, the Kelly bar connecting part 7 (shaft) moves downward in the axial direction, and the notch 1 of the lock part 11 moves downward.
3 and the protrusion 14 are disengaged. Bucket body 1
When rotated in the reverse direction, the blade 27 protruding from the outer surface of the bottom cover 3 scrapes the earth and sand 38 at the bottom of the hole into the opening 24, pushes open the check cover 25 inward, and takes it into the bucket main body 1. At this time, even if the lock portion 11 is disengaged, the opening/closing scraper 2 rotates while remaining closed. Next, rotate the Kelly bar 35 forward (clockwise)
When the rotational resistance between the bottom cover 3 and the earth and sand contact surface becomes a reaction force, the Kelly bar connecting portion 7 (shaft) rotates in the forward direction, and the stopper arms 10, 10 move toward the stopper 1.
The arms 15, 15 rotate at the same angle and push the links 16, 16 toward the opening/closing scrapers 2, 2 (see the imaginary line diagram in Figure 4) until they come into contact with the arms 15, 12 and stop. (See the phantom line diagram in FIG. 3).
Therefore, the opening/closing scrapers 2, 2 open outward,
The free end rotates while approaching the inner peripheral surface of the widened hole wall. Therefore, the earth and sand remaining on the hole wall are taken into the bucket main body 1.

In addition, by adjusting the bolt 12b of the stopper 12, the opening degree of the opening/closing scraper 2 can be adjusted.
It can be made to correspond to various pore sizes.

After rotating the bucket main body 1 in the forward direction for the required time, when the Kelly bar 35 is rotated in the reverse direction (counterclockwise), the rotational resistance between the bottom wall 3 and the earth and sand contact surface becomes a reaction force, which is caused by the rotation of the Kelly bar connecting portion 7. The stopper arms 10, 10 separate from the stoppers 12, 12 and rotate until they return to their original positions, but at this time, the arms 15, 15 rotate at the same angle and the link 1
Subtract 6,16'. Therefore, the opening/closing scrapers 2, 2 rotate around the hinge parts 20, 20, rotate inward, close, and stop when their free ends abut against the stop plates 21, 21. Therefore, when the Kelly bar 35 is pulled out of the hole, the bucket main body 1 separates from the bottom of the hole, and at this time, the Kelly bar connecting portion 7 moves upward in the axial direction of the sleeve 6, and its protrusion 14 fits into the notch 13 (the second (See Figure 8), the scrapers 2, 2 open and close due to the pressure of the dirt, etc. taken inside.
prevent it from opening. It also prevents the opening/closing scrapers 2, 2 from opening due to rotation due to erroneous operation. The check lid 25 of the bottom lid 3 closes the opening 24 by the pressure of the taken in dirt, etc., and prevents the taken in dirt etc. into the bucket main body 1 from leaking out. Then, when the bucket main body 1 is pulled out of the underground hole 34 and moved onto a dump truck (not shown) and the locking rod 29 is rotated by a predetermined angle, the bottom cover 3 is opened and earth and sand etc. are discharged. Once all the dirt, etc. in the bucket body 1 is discharged and the bottom cover 3 is pressed onto the discharged dirt or the ground to close it, the locking rod 29 is again rotated by a predetermined angle and pushed downward, resisting the force of the coil spring 33. Then, the stopper part 31 rotates and the bottom cover 3 is locked. As described above, it can be operated by the rotational force and pressing force of the Kelly bar, and does not require external operating force such as hydraulic pressure or pneumatic pressure.

Effects of the Invention According to the present invention described above, the central shaft is axially movable and rotatably inserted into and supported by the sleeve fixed to the bucket main body, and when the central shaft moves downward in the axial direction, the sleeve is fixed to the bucket main body. Since a lock part is provided that engages with the sleeve when the bucket is disengaged and moved upward in the axial direction, when the bottom dredging work is finished and the bucket main body is pulled up from the underground hole and the earth and sand etc. inside are discharged. Since the lock part fixes the center shaft and sleeve and holds the bucket main body so that it cannot rotate, there is no risk of the scraper opening accidentally and spilling dirt, etc.
Therefore, bottom dredging or excavation efficiency is improved.

Note that the present invention is not limited to bottom dredging, and can easily be applied to underground hole excavation, and in this case, a digging blade may be attached to the bottom cover and the opening/closing scraper.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view, Fig. 2 is a front view, Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2, Fig. 4 is a plan view, and Fig. 5 is a cross-sectional view taken along line B-B in Fig. 4. , FIG. 6 is an external view of the bottom cover, FIG. 7 is an internal view of the bottom cover, and FIGS. 8 and 9 are action explanatory views. 1...Bucket main body, 2...Opening/closing scraper,
3...Bottom cover, 4...Top opening, 5...Support plate, 6
...Sleeve, 7...Kelly bar connection part, 10...
...Stopper arm, 11...Lock part, 12...
Stoppa, 15... Arm, 16... Link, 2
0, 23, 26...Hinge part, 22...Opening/closing hole,
24...Opening hole, 25...Check lid, 27...Blade, 29...Lock rod, 30...Lock hole, 31
...Stopper part, 33...Coil spring.

Claims (1)

[Claims] 1 A rotatable scraper with a rotating center parallel to the axis is provided on the bucket main body, and the resistance of the ground surface of the bottom cover that can be opened and closed is reduced by the rotational force and thrust of the central axis of the bucket main body connected to the scraper. In a bottom dredging bucket in which a scraper opens and closes in response to a reaction force to take in and discharge dirt, etc. from outside the bucket body, a sleeve that supports the center shaft by inserting it in a movable and rotatable manner in the axial direction is inserted into the bucket body. The bottom is fixed to the center shaft, and is provided with a lock portion that disengages from the sleeve when the center shaft moves downward in the axial direction and engages the sleeve when the center shaft moves upward in the axial direction. A dredged bucket.