JP2006125161A - Low-soil-excavation ground excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly excavate pile shafts of an appropriate depth with a low amount of soil excavation to the surface. <P>SOLUTION: A drum-shaped steel pipe 1 is provided with upper and lower end plates 2 and 3. The lower surface of the lower end plate 3 is provided with such a spiral blade 4 as to reach the outer circumferential surface of the lower plate 3 in the direction of left rotation from its center part toward the tangential direction of the lower end plate 3. The lower surface of the spiral blade 4 is provided with a circular flange 6. One end of a notch part 7 formed in the flange 6 is bent downward in the direction advancing downward at right rotation in the bound excavator. An inclined groove 9 is formed in the outer circumferential surface of the drum-shaped steel pipe 1 in the direction advancing downward by right rotation. The groove 9 has openings 10 and 11 in the lower end plate 3 and the upper end plate 2. A rotation adjusting plate 13 which closes a part of the opening part 10 against the force of a spring 12 upward from below and is opened downward from above by the force of the spring 12 is pivoted at a lower part of a preceding edge at right rotation in the opening part 10 of the lower end plate 3, and a relieve gap (t) is interposed in the opening part 10 when the opening part is in a closed state in this low-soil-excavation ground excavator. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention injects water into the excavation part from the lower end of the shaft pipe, hydrates the excavated earth and sand, and consolidates the hydrated excavated earth and sand into the hole wall, thereby reducing the discharge of the excavated earth and sand to the ground, and previously setting the pile hole in the ground This is related to low excavation ground excavation technology (pre-boring).

  Conventionally, a construction method and an apparatus for embedding concrete piles or steel pipe piles without soil removal have been developed (for example, Patent Documents 1 and 2).

  However, this method is suitable for embedding concrete piles or steel pipe piles directly in the ground, but it is difficult to apply to the method of excavating only pile holes in the ground with low soil removal, and a sufficient excavation depth is obtained. It was difficult.

  In other words, it required construction to remove piles remaining on the ground after construction.

JP2004-3124 JP 2004-3125 A

  An object of the present invention is to smoothly excavate a pile hole at an appropriate depth with low earth removal with little earth discharge.

In order to achieve the above object, the present invention
Upper and lower end plates are provided on a drum-shaped steel pipe that is rotatable around the first center line, and reaches the outer peripheral surface of the lower end plate from the central portion toward the left rotation direction on the lower end plate, and is tangent to the lower end plate. A spiral blade that faces in the direction is provided, and a shaft tube that shares the center line is fixed in the left-right rotation direction at the center of the upper end plate, and a circular shape having the same diameter as the lower end plate is provided on the lower surface of the spiral blade. A ground provided with a flange, and one end of a notch formed in the flange is bent downward in a direction of moving downward when turning right, and a ground excavation spiral cone is provided at the center of the lower surface of the flange In the excavator, an inclined groove is formed on the outer peripheral surface of the drum-shaped steel pipe so as to move downward by rotating to the right, and the groove is opened in the lower end plate and the upper end plate. A part of the opening is closed from the bottom to the bottom of the rotating leading edge against the striated force. The pivoted pivoting adjustment plate opening from top to bottom by the force, characterized by comprising by interposing a gap relief to the opening in the opening portion closed lower exhaust land board drilling apparatus,
Secondly, the low excavation ground excavation device according to the first invention, wherein the lower bent lower end portion of the notch portion is slightly enlarged radially outward.
Third, a sliding adjustment plate in the left-right rotation direction is provided on the lower surface of the trailing edge facing the leading edge, and the sliding adjustment plate has an arc shape centered on the center line, and the adjustment A low excavation ground excavation device according to the first or second invention, wherein an arc-shaped long hole is formed in a plate, and is screwed to the lower end plate with a bolt through the long hole.
Fourth, a spiral blade is provided on the outer periphery of the shaft tube to form an earth auger, and the direction of the spiral blade is a direction in which the spiral blade is advanced downward by rotating rightward. Low-emission ground excavator,
The low-drainage ground excavation device according to any one of the first to third inventions, wherein a plurality of short rods project from the outer periphery of the fifth axial tube to form a sediment mixing part,
Sixthly, the low-drainage ground excavation device according to any one of the first to fifth inventions, comprising an upward rotation stopper and a downward rotation stopper of the rotation adjustment plate,
Consists of.

  Therefore, the ground pipe is excavated by rotating the excavating device by the shaft pipe, the drum-shaped steel pipe and the spiral cone clockwise from the ground and propelling downward.

  When excavating, water is injected from the lower end of the shaft tube.

The excavated earth and sand enters between the flange and the lower end plate from the notch of the flange,
The approaching earth and sand is guided to the outer peripheral surface of the spiral blade rotating rightward and pressed toward the excavation hole wall, enters into the consolidation state in the hole wall, and forms a consolidation wall.

  The excavated earth and sand pressed by the hole wall tries to enter the inclined groove of the drum-shaped steel pipe, but the rotation adjusting plate is rotated upward from the bottom against the splay to close a part of the opening. For this reason, the earth and sand are pressed sideways by the right turn of the spiral blade, and the intrusion into the inclined groove is prevented, but the surplus earth and sand enter the inclined groove by the escape gap between both adjusting plates, and the downward propulsion excavation Operation is retained.

  After the excavation reaches a certain depth, the downward propulsion of the excavator is stopped and the excavator is raised to the ground while continuing to rotate right. Since the opening of the lower end plate is opened, the earth and sand entering the inclined groove descends from the opening and is pressed against the hole wall by the right turn of the spiral blade to cause the pressure to enter into the hole wall. However, the apparatus is lifted to the ground along the hole wall, and the discharge of excavated earth and sand to the ground is reduced.

  Further, the diameter of the excavation hole is slightly enlarged by the diameter-expansion cutting by the rotation of the downward bent lower end portion slightly enlarged in the radial direction.

Since the present invention is configured as described above, a pile hole of a predetermined depth is excavated in advance from the ground into the ground, and not only when the excavated soil is propelled, the hole wall can be consolidated and strengthened not only when it is pulled up, but also the excavated sediment There is an effect that can be reduced.
Also, when drilling is propelled, the drilling hole wall is slightly enlarged by the downward bent lower end of the notch, reducing resistance to the drum outer wall and improving drilling efficiency, especially in sandy and clay Has an excellent effect.

  A crawler 33 is arranged on the ground 31 and supported by the wire rope w along the upright 15 (FIG. 4B) supported by the crawler 33, the forward / reverse rotating prime mover 16 is supported by lifting and lowering. The upper end portion of the shaft tube 5 sharing the center line c is connected to the direction drive shaft tube 17, and the shaft tube 5 can be rotated right or left by the right or left rotation of the downward drive shaft tube 17.

  As shown in FIG. 1, a spiral blade 18 is provided on the outer periphery of the shaft tube 5 so as to advance downward by turning right (direction a) to form an earth auger 19.

A drum-shaped steel pipe 1 is provided at the lower end portion of the shaft pipe 5 so as to be rotatable around the center line c, and upper and lower end plates 2 and 3 are provided on the steel pipe 1;
The lower end hexagonal female tube 5 'sharing the center line c with the hexagonal male tube 2' protruding to the center of the upper end plate 2 is fixed in the left-right rotation direction and is detachable by a pin p. Provided.

  Further, as shown in FIGS. 2A and 2B, a spiral blade 4 is provided on the lower surface of the lower end plate 3 from the central shaft tube 5 ″ to the outer peripheral portion in the left rotation direction (direction b).

  The radius of curvature of the outer peripheral surface 4 ′ of the spiral blade 4 gradually increases from the tangential direction of the outer peripheral surface of the central shaft tube 5 ″ to the left rotation direction (arrow b) from the tangential direction of the outer peripheral surface of the drum-shaped steel tube 1. .

  On the outer peripheral surface 4 ′ of the spiral blade 4, a plurality of cross-sectional triangular strips 4 ″ can be provided at appropriate intervals.

  A circular flange 6 having the same diameter as that of the lower end plate 3 is provided on the lower surface of the spiral blade 4 formed in this way, and a notch 7 is provided between the terminal end portion and the start end portion of the spiral blade 4 on the flange 6. Then, one end of the cutout 7 is bent downward in the direction of downward movement when the right rotation is performed (arrow a), and a cutting blade 7 ″ is provided at the bent lower end 7 ′. 'Is slightly expanded outward in the diameter direction (radial direction) of the flange 6, and a cutting blade 7 "outside the lower end portion 7' is provided outside the flange 6 (FIG. 2 (c)). The outer projecting cutting blade 7 ″ slightly increases the diameter 23 ″ of the hole wall 23 when propelling to the right, thereby facilitating the propulsion.

  Further, a ground excavation spiral cone 8 sharing the center line c is provided at the center of the lower surface of the flange 6, and a water inlet 20 is opened at the lower end of the central shaft tube 8 'of the cone 8 through a check valve 8 ". This water inlet can be opened on the side surface of the central shaft tube 8 '.

  Further, the outer periphery of the flange 6 is closed when rotating right (solid line in FIG. 2 (B)) and opened when rotating left (virtual line in FIG. 2 (B)). The diameter of the pile hole wall 23 is expanded by the opened blade 21, and cement milk is injected and cured from the water injection port 20 into the expanded diameter portion 23 'to form a lower end foundation portion of the pile.

  An inclined groove 9 is formed on the outer peripheral surface of the drum-shaped steel pipe 1 in the direction of going downward by the right rotation (arrow a).

  The inclined groove 9 is provided in the outer peripheral portion with an opening angle of about 90 degrees along the outer peripheral spiral of the central shaft tube 5 ″ of the drum-shaped steel pipe 1, and the lower and upper ends of the groove 9 are opened in the upper and lower end plates 2 and 3. Then, the openings 10 and 11 are formed.

  In the opening 10 of the lower end plate 3, a part of the opening 10 is closed from the bottom to the top right below the leading edge 10 ′ of the right turn (arrow a) against the force of the ridge 12, and the A rotation adjusting plate 13 that opens from the top to the bottom by the force of the ridge 12 is pivotally supported by a radial pin 13 'so as to be freely opened and closed.

  In the closed state of the adjusting plate 13, the ascent is stopped by the ascending rotation stopper 24 provided on the lower surface of the lower end plate 3 shown in FIG. 3B, and in the opened state, the ascending rotation provided on the outer surface of the central shaft tube 5 ″. The moving stopper 24 'stops the descent.

  On the lower surface of the trailing edge 10 ″ of the opening 10 facing the right-turning leading edge 10 ′ of the opening 10, a sliding adjustment plate 14 in the rotation direction (arrows a and b) is attached to a bolt 14 ′. , 14 ′ are detachably supported, and a clearance gap t is interposed between the adjusting plates 13, 14.

  The gap t is adjusted by loosening the bolts 14 'and 14' and sliding the slide adjusting plate 14 in the left-right direction (arrows a and b), and tightening and fixing the bolts 14 'and 14'.

  The bolts 14 ′ and 14 ′ are screwed into the lower end plate 3 through arc-shaped long holes 14 ″ and 14 ″ drilled in the adjusting plate 14.

  The opening 11 of the upper end plate 2 enlarges the upper end groove width of the inclined groove 9 by the notch surface 11 '.

Instead of the earth auger 19, as shown in FIG. 4 (b), a plurality of short rods 25 may be provided on the outer periphery of the shaft tube 5 in a staggered position to form the earth and sand agitation part 26.
As shown in FIG. 4 (b), the spiral blade 18 is fitted into a perforated casing 27, and the casing 27 is fitted to the output shaft 17 of the prime mover 16 on a common center line c via flanges 28, 28 'and bolts 29. A small amount of excess earth and sand in the casing 27 can be discharged to the ground 31 through a plurality of through holes 30 that are supported integrally with the shaft tube 5 and drilled in the casing 27.

  In the figure, reference numeral 32 denotes a spiral earth and sand guide plate provided in the middle between the lower end plate 3 and the circular flange 6. In FIG. 4 (b), 34 and 34 'denote pulleys provided on the upright column 15. , W ′ are wire ropes.

When the excavator is propelled underground to form a pile hole before pile laying or pile formation and when the excavator is lifted to the ground, the excavated earth and sand is turned right into the pile hole wall 23. The pressing pressure to the pile hole wall 23 can be sufficiently obtained by partially closing the opening 10 of the lower end plate 3 with the rotation adjusting plate 13 when the pressing compaction is performed.
And the opening area of the opening 10 corresponding to the strength of the ground is obtained by the sliding adjustment of the sliding adjustment plate 14,
By providing the clearance gap t, the ground propulsion resistance due to the increase in the indentation pressure can be reduced.

  In addition, by pouring water into the excavated soil through the shaft pipes 5, 5 ', 5 ", 8' and the water injection port 20, the excavated soil can be softened and fluidized and easily escaped into the inclined groove 9 during propulsion. In addition, it is easy to move to the spiral blade 4 side at the time of pulling up, and ground discharge of excavated earth and sand can be reduced during ground excavation.

  Further, the notch 7 of the flange 6 is bent downward in the propulsion direction and the bent lower end 7 'is slightly expanded in the radial direction, thereby slightly expanding the propulsion hole diameter of the sandy and clayey ground. Hole wall friction is reduced and propulsion is facilitated.

It is a front view which shows the low discharge ground excavation apparatus of this invention. (A) The figure is a cross-sectional plan view taken along the line A-A in FIG. 1, (b) The figure is a cross-sectional plan view taken along the line B-B in FIG. It is. FIG. 2A is a partially enlarged plan view of FIG. 2A showing the rotation adjusting plate, and FIG. 2B is a front view of FIG. (A) and (b) are front views of another embodiment of FIG.

Explanation of symbols

c Center line 1 Drum-shaped steel pipe 2, 3 Upper and lower end plate 4 Spiral blade 5 Axial tube 6 Circular flange 7 Notch 7 'Bent lower end 8 Ground excavation spiral cone 9 Inclined groove 10, 11 Opening 10' Right turn Leading edge 10 "Trailing edge 12 Stroke 13 Rotation adjusting plate 14 Sliding adjusting plate t Relief gap

Claims (6)

Upper and lower end plates are provided on a drum-shaped steel tube that can be rotated around the center line, and the lower end plate is provided on the lower surface from the center toward the left rotation direction to the outer peripheral surface of the lower end plate, and in the tangential direction of the lower end plate. With a spiral blade
A shaft tube that shares the center line is fixed to the center of the upper end plate in the left-right rotation direction,
A circular flange having the same diameter as that of the lower end plate is provided on the lower surface of the spiral blade, and one end of a notch formed in the flange is bent downward in a direction of moving downward when turning right, and the In the ground excavation apparatus in which a spiral drill for ground excavation is provided in the center of the lower surface of the flange,
An inclined groove is formed on the outer peripheral surface of the drum-shaped steel pipe in the direction of moving downward by turning right, and the groove is opened in the lower end plate and the upper end plate,
A rotation adjusting plate that closes a part of the opening from the bottom to the top against the splaying force and opens from the top to the bottom by the splaying force at the lower part of the leading edge of the right turning at the opening of the lower end plate. A low excavation ground excavation device characterized by being supported by a shaft and having a clearance gap interposed in the opening when the opening is closed.   The low excavation ground excavation device according to claim 1, wherein the lower bent lower end of the notch is slightly expanded radially outward. A sliding adjustment plate in the left-right rotation direction is provided on the lower surface of the trailing edge facing the leading edge, and the sliding adjustment plate has an arc shape centering on the center line, and the adjustment plate has a circular shape. The low excavation ground excavation device according to claim 1 or 2, wherein an arc-shaped long hole is formed and screwed to the lower end plate with a bolt through the long hole.   The low drainage land board according to any one of claims 1 to 3, wherein a spiral blade is provided on an outer periphery of the shaft tube to form an earth auger, and the direction of the spiral blade is a direction in which the spiral blade is advanced downward by a clockwise rotation. Drilling rig.   The low-drainage ground excavation device according to any one of claims 1 to 3, wherein a plurality of short rods project from the outer periphery of the shaft tube to form a sediment mixing part.   The low-drainage ground excavation device according to any one of claims 1 to 5, further comprising an upward rotation stopper and a downward rotation stopper of the rotation adjustment plate.

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