JP2667697B2 - Drilling device for expanded bottom part of hole for expanded pile by earth drill method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in an apparatus for excavating an enlarged bottom portion in a hole for an enlarged pile by an earth drill method.

2. Description of the Related Art Japanese Patent Publication No. 62-45954 provides an example of this type of excavator.

This excavator has a case, a bottom cover openably and closably mounted on the lower surface of the case, an expanding wing rotatable on the case, and a scraper that moves in conjunction with the expanding wing.

The case is composed of a plurality of case members, and each member is arranged at intervals on the circumference. The bottom lid is arranged in a lower opening formed by the case member, and is openably and closably attached to one of the case members. An enlarged wing is located in each of the gaps between the case members and moves between a first position related to the diameter of the case and a second position related to the diameter of the expanded pile hole to be excavated. And a cutter array on the outermost side edge. The movement of the expansion wings is made by, for example, a hydraulic cylinder. The scraper approaches the expanding wing as the expanding wing moves from the second position to the first position, closes the gap with the expanding wing, and expands as the expanding wing moves from the first position to the second position. It is configured to be able to move in conjunction with the enlarged wing so as to separate from the enlarged wing so as to form an earth and sand guideway for the gap together with the enlarged wing.

After drilling holes related to the diameter of the shaft portion of the expanded bottom pile using a drilling bucket generally used for earth drills, the drilling bucket is replaced with this expanded bottom portion drilling equipment, It is done by excavating the bottom expanding part with the bottom expanding diameter.

Excavation of the flared portion is performed by retracting the wing to the diameter of the shaft portion in the flared pile, that is, lowering the wing to the position related to the first position, lowering the wing to the bottom of the hole, and then rotating the entire device. At the same time, this is done by pushing the expanding blades to a predetermined expanded bottom diameter. When the expanding wing was pushed out, the scraper was opened in conjunction with the expanding wing, and the expanding wing formed a guideway together with the expanding wing to extract the scraped earth and sand inside the case member. When the extended wings are retracted, the enlarged wings and the scraper can force the earth and sand into the case. It is possible to excavate a hole for a bottom pile without having to drill.

[Problems to be Solved by the Invention] Such an excavator can increase the extrudable bottom diameter by increasing the pushing amount of the expanding wing. However, as the expanding wing is pushed out of the design value, the rake angle of the cutter gradually increases, and the force required for excavation decreases, but the clearance angle decreases accordingly, and finally the cutter becomes zero. Since it becomes impossible to bite into the ground, it is not possible to increase the pushing-out amount of the expanding wing beyond a certain limit.

An object of the present invention is to provide an expanded bottom drilling device for an expanded pile hole by an improved earth drill method, which is capable of drilling an expanded pile hole of a wider size.

[Means for Solving the Problems] An expanded part drilling device for an expanded pile hole by the earth drill method of the present invention is formed by a plurality of case members arranged at intervals on a circumference and a case member. A bottom lid disposed at the lower opening to be opened and closed to one of the case members so as to be openable and closable, and a first lid related to a diameter of a circle formed by the case member, disposed at each of the gaps between the case members. A plurality of enlarged wings comprising a cutter array capable of moving between a position and a second position related to the enlarged diameter of the enlarged pile hole to be drilled; and And a driving means for making each of the expanding wings approach the expanding wing as each of the expanding wings moves from the second position to the first position, closes the gap with the expanding wing, and the expanding wing is moved from the first position to the second position. Head to position And a scraper that moves in conjunction with the expanding wing and separates from the expanding wing and forms an earth and sand guide path for the gap with the expanding wing.

However, in the excavator of the present invention, each of the cutter arrays is formed by alternately arranging the cutter for hole excavation and the cutter for trench excavation, and when the excavator is rotated, it rotates in advance. The hole digging cutter on the enlarged wing is disposed on each of the enlarged wings so as to be located at a position related to the groove excavation cutter on the enlarging wing that rotates later.

[Operation] In the drilling device of the present invention, the drilling of the hole in the pile is performed by rotating the entire device after drilling the hole in the shaft portion of the pile in the same manner as the conventional drilling device. This is done by moving the expanding wing to a diameter. At this time, in the excavator of the present invention, the cutter for groove excavation provided on the expanding wing that previously rotates formed a groove in the ground to warp the ground, and then the hole drilling cutter was warped. Since the ground can be excavated, excavation can be performed with a small force. For this reason, in the state where the expanding wing is pushed further outward from the second position, that is, in the state where it is pushed from the second position to the position between the third position, the relief angle of the hole drilling cutter is increased. Thus, even if it is ensured that the burrow is made into the ground, in other words, even if the rake angle of the cutter becomes small, it is possible to excavate the hole for the expanded pile with a small power.

[Embodiment] The drawings show an embodiment of an excavating device for the bottom expanding portion of the hole for bottom expanding pile of the present invention.

As shown in FIGS. 1 and 2, the excavated bottom excavating device is formed between a frame 10, a case 11, a bottom cover 12 arranged at a lower opening of the case, and members constituting the case. Two enlarged wings 13 arranged in a gap and having a cutter, a hydraulic cylinder 15 for pushing and retracting the enlarged wings, and arranged in the gap formed in the case and connected to each of the enlarged wings. Scraper
As in the case of the conventional excavator, the excavator is extruded while rotating the entire excavator to excavate the expanded bottom portion.

However, in the drilling device for a hole for an expanded pile according to the present invention, the diameter of the shaft portion is d ₁ , the diameter of the expanded portion is D ₁ , and the height of the inclined portion is h _1, as shown by a solid line and a broken line in FIG. , The width of the flat part is b, the height of the rising part is h ₂ , and the depth of the bottom part is
h ₃ , the angle of inclination of the bottom portion is θ, not only the hole for the bottom pile that can be excavated by conventional drilling equipment, but also the larger shaft portion diameter d ₂ and bottom portion diameter indicated by the dashed line drilling拡底pile hole with D ₂ is also allowed to be able to perform.

Referring back to FIG. 1 and FIG. 2, the frame 10 is formed by welding and assembling plate materials and mold materials in a cross beam shape.
A connecting member 21 for the kelly bar of the earth drill device is attached to the upper part.

The case 11 is composed of the two case members 22 as described above. Each of the case members is formed of a vertically long member having a cylindrical surface forming a part of the circumference. These cylindrical surface, centered on the center of the frame, than the diameter d ₁ of the shaft portion of the拡底pile, constitutes a part of the circumference having a slightly smaller diameter. These case members form a substantially cylindrical case which is arranged with a gap formed therebetween at the lower portion of the frame 10, is connected to the upper portion of the frame 10, and has upper and lower ends opened.

The bottom lid 12 has a diameter capable of covering the lower end opening of the case 11, is connected to one of the case members by a hinge, and is held by a fastener to the other case member to open or close the lower part of the case. To be able to. Bottom cover itself, as in the conventional excavating apparatus, a conical shape, with is formed in a form associated with the conical portion in the bottom portion of the hole for拡底pile from the shaft portion diameter d ₁ of the holes for拡底pile Also have a slightly smaller diameter.

Further, the bottom cover is provided with two substantially fan-shaped notches as shown in FIG. An edge is formed on the edge 24 forming the notch, and when the excavator is rotated, the soil that has wrapped under the bottom lid 12 by the edge is scooped, and the edge passes through the notch. Then, the earth and sand can be guided inside the case 11.

Also, on the surface inside the case in the bottom lid 12,
Two valve plates 25 are arranged. These valve plates are arranged so as to cover each of the notches,
When this excavator is rotated, the leading edge is connected to the bottom lid by a hinge, and when the earth and sand scooped by the edge are taken into the case through the notch, the hinge is turned on. The earth and sand are guided around the inside of the case 11 so that the earth and sand once taken in the case does not spill out again.

Each of the enlarged wings 13 is disposed so as to pass through each of the gaps formed between the case members 22, and has an upper portion rotatably connected to the frame 10. not only the diameter D _1, are allowed to be able to extrude further to拡底diameter D _2. For mounting to the frame, the bearing at the end of the member extending from the enlarged wing is arranged between the members constituting the frame 10,
This is done by inserting pins into these.
In FIG. 1, the right-hand expander blade bearing is designated by the reference numeral 32 and both expander blade pins are designated by 33, respectively.

The enlarged wing itself has a cutter holding wall 34, a sediment guide wall 35, and a cutter array 36, respectively. The earth and sand guide wall has a cylindrical surface that forms a part of the circumference centered on the pin 33 when viewed from a plane, and has a lower end edge that forms a bottom portion of the expanded portion in the expanded pile hole when viewed from the side. It has a related shape, and the side edges are configured to have an angle related to the inclination angle θ of the bottom expanding portion of the bottom expanding pile. The cutter holding wall 34 is fixed by welding to the inclined side edge of the earth and sand guide wall. The cutter array 36 is disposed on and fixed to the cutter holding wall of each magnifying wing such that a straight line passing through the cutting edge of the cutter constituting the cutter array 36 forms an angle corresponding to the inclination angle. I have.

In this excavating device, the cutter array 36 is, as shown in FIGS. 4 and 5, a cutter 41 for excavating the expanded bottom portion.
In addition, a cutter 42 for digging a ditch is provided. Cutters 41, 42 in each of the cutter arrays
They are spaced apart from each other. However, the cutter 41 included in the cutter array on the one enlarged wing is located at a position corresponding to the cutter 42 included in the cutter array on the other enlarged wing, and the cutter 41 included in the cutter array 36 on the other enlarged wing. Are arranged at positions corresponding to the cutters 42 included in the cutter array 36 on one of the enlarged wings. Among these cutters, the cutter 41 has the same structure as that of the conventional cutter. However, the clearance angle γ is
The expanding blade 13 is arranged on the expanding blade so that the optimum angle is obtained when the expanding blade 13 is pushed to a position related to the expanded diameter D ₂ . The rake angle α is thus maximum when the expanding blade 13 is pushed out to a position related to the expanded diameter D ₂ . On the other hand, the cutter 42 has a V-shaped tip as well shown in FIG. 5, and when the excavator is rotated,
It is made of a material capable of excavating a V-shaped groove in the ground.

The hydraulic cylinder for rotating the expansion blade 13 is shown by the reference numeral 15 in FIG. For the left magnifying wing it is located on the back of this drilling rig. In these hydraulic cylinders, the cylinder case is connected to the frame 10 and the rod is connected to each of the expanding wings.
The expanding wing is rotated about the pin 32 so that the expanding wing can be pushed out of the case 11 or drawn into the case.

Further, the enlarged wings 13 are connected to each other by a mechanism including links 43 and 44. Link 43 is frame 10
Is mounted so as to rotate about this. The link 44 has one end connected to the link 43. Although not shown, there is another link on the back of the device, which is arranged parallel to the link 44 and has one end connected to the link 43. Link 44 and links not shown are connected at opposite ends to each of the enlarged wings. This link mechanism is such that when one of the enlarged wings 13 receives a force to rotate in a certain direction, for example, when the left enlarged wing in FIG. 1 is pushed, the link 44 rotates the link 43 and the link 43 rotates. 43
Draws a link (not shown), rotates the right enlarged wing by the same angle, makes the distance between the tip and the center of rotation of both enlarged wings the same, and when the left enlarged wing is pushed in Can similarly move the right wing.

The scraper 16 has the same radius of curvature as the case member 22, is connected to the enlarged wing 13 by a link 45, and has a side edge rotatably attached to a side edge of each case member 22. The center axis of rotation of each scraper coincides with that of the facing expansion wing 13. As shown in FIG. 3, when the expanding wing is retracted, these scrapers cover the side opening of the case 11, and together with the case member 22 and the expanding wing 13, form a shape close to a cylinder. As shown in FIG. 2, when the enlarged wing is pushed out, the enlarged wing can be rotated outward around the pin 32 via the link 45 and can be projected from the case 11 together with the enlarged wing. Further, a guide plate 46 is attached to the free edge side edge of each scraper. These guide plates are pin-connected to each of the scrapers, and are rotatable only inside, in other words, only in the counterclockwise direction in FIG. 2 when subjected to an external force.

Drilling holes for bottom piles is similar to conventional equipment of this kind,
After drilling a hole related to the shaft portion of the expanded pile by a drilling bucket generally used in an earth drill, exchanging the drilling bucket with the expanded drilling device according to the present invention and excavating the expanded portion. Has been made by

Construction of拡底portion in拡底pile hole until拡底diameter D _1, with reference to FIG. 9, after which subjected to drilling holes with a diameter d ₁ associated with the shaft portion of the拡底pile by drilling bucket, enlarged while closed wings, down the rig to the bottom of the hole, while rotating the entire device, while extruding an expanded wings to a predetermined拡底diameter D _1, is done by drilling a拡底portion indicated by a solid line.

Another flared hole with a larger size, ie the flared diameter D ₁
Drilling拡底holes for other拡底piles with拡底portion size of between up to D ₂ from, likewise, holes associated with the shaft portion of the拡底pile, i.e. by drilling bucket drilling holes of diameter d ₂ done, then it was replaced with拡底drilling apparatus according to the present invention, while rotating the entire device is made by extruding the expanded wings until拡底diameter D ₂ of interest.

In excavating the widened portion, the excavator is rotated in a counterclockwise direction in FIG. When rotated, the cutter 42 of the enlarged wing 13 that rotates first digs a V-shaped groove to loosen the ground, as shown in FIG. then,
The cutter 41 on the trailing expansion blade 13 moves outward as the expansion blade pushes out,
The ground loosened by 42 is cut, and at the same time, the cutter 42 on the expanding wing loosens the ground. Thereafter, the cutter 41 on the first enlarged wing similarly cuts the loosened ground, and the cutter 42 loosens the ground again. Thereafter, these are repeated, and excavation is performed to a predetermined enlarged bottom diameter. The excavator according to the present invention is thus configured such that the cutter 41 excavates the ground that has been loosened in advance by the cutter 42, so that the excavation resistance is reduced despite the small rake angle α of the cutter 41. Therefore, it is possible to excavate a hole for a bottom expanding pile having a large bottom expanding diameter with a small amount of power.

When the excavator is rotated, the expanding wing 13 is pushed out, and the cutter array 36 scrapes off the earth and sand, the earth and sand passes through the opening formed by the expanding wing and the tip of the scraper.
Is guided to rotate the guide plate 45 at the edge of the scraper on the tip side. After this, the earth and sand is guided by the earth and sand guide wall
While being guided to 35, it is taken inside the case member 22. Then, when the expanded bottom portion having a predetermined diameter is excavated and the expanding wing and the scraper are retracted, these also rotate inward at the same time, and the earth and sand scraped by the expanding wing can be drawn into the case. In addition, the bottom of the hole for the expanded bottom pile is formed by scooping the earth and sand which the edge 24 of the notch in the bottom cover 12 has wrapped under the bottom cover 12, and passes the case 11 through the notch in the bottom cover. And the valve plate 25 prevents the earth and sand from escaping to the outside of the case again.

This drilling apparatus further have includes an adapter, by mounting an adapter on each of the case member, when extruded expanded wings 13 at the position of between from拡底diameter D ₁ to拡底diameter D _2, enlarged The gap formed between the rear end of the wing and the case member 22 is covered by an adapter so that the cutter array 36 does not spill the scraped soil from the case.

The adapter is designated by the reference numeral 51 in FIGS. Each of the adapters has a body wall 52 attached to the case member 22. The main body wall 52 is tangential to a wall portion having a radius of curvature that is in close contact with the case member 22 and a sediment guide wall 35 that protrudes from a side edge of the case member and constitutes an enlarged wing when brought into close contact with the case member. It has a wall part located on it. Further, reinforcing walls 53 are arranged at intervals on the outer surface of the main body wall, and are fixed to the respective wall portions by welding. Further, two members 54 are fixed by welding to the surface of the main body wall 53 which is in contact with the case member. These members are coaxially provided with pin holes. On the other hand, each of the case members 22 is provided with an opening 55 as well shown in FIG. As shown in FIG. 6, the adapter is attached to the case member by connecting the member 54 to the opening 55 of the case member.
After that, the headed pin 56 is inserted into the pin hole of the member 54. The adapter is
When mounted on the case member, and is configured so that the diameter is no smaller than the shaft portion d _2.

These adapters, as shown in FIG.
When There has been moved to a large拡底diameter D ₂ than拡底diameter D _1, to form an extension of the casing member 22, it is possible to eliminate the gap created between the rear end and the case member of the enlarged wing Thus, the earth and sand scraped by the expanding wings can be reliably held inside the case 11.

In this drilling system, when performing drilling expansion wings from拡底diameter D ₁ to拡底diameter D _2, the gap occurring between the expanded wings 13 and the case member 22 is not such an adapter only, Other means such as a case member can be expanded and contracted can be adopted.

[Effects of the Invention] The excavation device for the expanded bottom portion in the expanded pile hole of the present invention includes:
As described above, even if the rake angle of the cutter is small, it is possible to perform excavation with a small power, and when extruding the expanding wing further outward than the conventional device, the rake is required to secure a clearance angle. Even with a small angle, excavation can be performed with a small amount of power, and it can cover a wide range of expanded bottom diameters. This effect can be added to an existing device without making a major modification or change.

[Brief description of the drawings]

The drawings show an embodiment of a drilling device for a bottom expanding portion of a hole for a bottom expanding pile by the earth drilling method of the present invention.
FIG. 2 is a perspective view showing the overall configuration, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG. 1 showing an operation state different from FIG. 4, FIG. 4 is an enlarged sectional view of a portion B in FIG. 2, FIG. 5 is an explanatory view showing the configuration of the cutter, FIG. 6 is a perspective view showing the entire configuration in another use state, and FIG. FIG. 8 is a sectional view taken along the line CC, FIG. 8 is a sectional view taken along the line CC of FIG. 6 showing an operation state different from FIG. 7, and FIG. FIG. 10 ... case, 12 ... bottom lid, 13 ... enlarged wings, 15, 31-33
...... Means for moving expanded wings, 16 …… Scraper, 22
…… Case member, 36… Cutter array, 41… Cutter for drilling holes, 42… Cutter for drilling grooves, D ₁ , D ₂ … Diameter of the expanded bottom part of the expanded pile hole, d ₁ , d ₂ …… Shaft diameter of hole for expanded pile.

Claims (2)

(57) [Claims] A plurality of case members arranged at intervals on a circumference; a bottom cover arranged in a lower opening formed by the case members and attached to one of the case members so as to be openable and closable; Between each of the gaps between the members, a first position related to the diameter of the circle formed by the case member and a second position related to the expanded diameter of the expanded pile hole to be excavated. A plurality of wings comprising a cutter array, driving means for causing each of the wings to make said movement, as each of the wings moves from the second position to the first position. An enlarged wing approaching the enlarged wing, closing the gap together with the enlarged wing, separating from the enlarged wing as the enlarged wing moves from the first position to the second position, and forming an earth and sand guide path for the gap with the enlarged wing. In a drilling device for a deepened portion in a deepened hole for a deepened pile by an earth drill method having a scraper that moves in conjunction with each other, each of the cutter arrays is configured by alternately arranging a hole drilling cutter and a groove drilling cutter. When the drilling rig is rotated, the hole drilling cutter on the preceding rotating magnifying wing of the adjacent expanding wing is moved to a position related to the groove drilling cutter on the rotating rotating wing that follows. An excavating device for an enlarged bottom portion in an enlarged pile hole by an earth drill method, wherein the excavated portion is arranged on an enlarged wing. 2. The excavating apparatus according to claim 1, wherein the groove excavating cutter is configured to form a V-shaped groove in the ground when the excavating apparatus is rotated.