JP6286097B1 - U-type steel sheet pile press-fitting device - Google Patents

Abstract

An object of the present invention is to press-fit a U-shaped steel sheet pile into the ground while adjoining a large number of U-shaped steel sheet piles while engaging their engaging ears with each other, and U-shaped web portions of adjacent U-shaped steel sheet piles are alternately reversed. An object of the present invention is to propose a U-shaped steel sheet pile press-fitting device. A press fitting main body 11 is equipped with a chuck device 12 so as to be movable up and down and horizontally rotatable. The auger casing 8 and a U-shaped web along the outer periphery of the auger casing 8 are mounted on the chuck device 12. The U-shaped steel sheet pile 10 is chucked so that the portion 10a faces the auger casing 8 side, and the casing rotating device 13 is interposed between the auger body 7 and the auger casing 8 of the earth auger 5 or the auger casing 8 itself. The auger casing 8 is rotated by the casing rotating device 13, and the chuck device 12 for chucking the auger casing 8 can be independently horizontally rotated with respect to the auger body 7 by the casing rotating device 13 via the auger casing 8. It is provided. [Selection] Figure 1

Description

  In the present invention, a large number of U-shaped steel sheet piles are adjacent to each other while engaging their engaging ears, and the U-shaped web sheet portions of the adjacent U-shaped steel sheet piles are alternately reversed to bring the U-shaped steel sheet piles into the ground. The present invention relates to a U-shaped steel sheet pile press-fitting device.

  7 and 8 show the prior art of the present invention. First, in FIG. 7, the structure of the U-shaped steel sheet pile press-in device will be described. As a result, the space between the left and right sides of the bifurcated boom portion 1 is a void portion 2, and a right lifting wire 3 and a left lifting wire 4 are attached to the respective tip portions 1 a and 1 a of the left and right bifurcated boom portions 1. The lower ends of the left and right lifting wires 3, 4 are connected to the suspended devices 18, 18 such as the left and right suspended sheaves, and are suspended between the left and right suspended devices 18, 18. The frame 19 is detachably attached by a mounting member 20 such as a mounting pin as shown by a two-dot chain line, and the ground auger 5 as a suspended object is integrally fixed by the suspended frame 19 at the center thereof. To be suspended That.

  In addition, in a place where the upper space is restricted by a bridge or the like, the tip of the crane arm is formed in the bifurcated boom portion 1 in order to lift and suspend a suspended object that is as long as possible in the vertical direction. The lifting device is a well-known technique as shown in Patent Documents 1 to 3 below.

  The earth auger 5 is located in the void portion 2 and has an auger body 7 having an auger drive unit 6; an auger casing 8 attached to the auger body 7; The auger screw head 9 </ b> Aa projects downward from the lower end of the auger casing 8, and is composed of an auger screw rod 9 </ b> A driven by the auger drive unit 6, and is supported by an existing U-shaped steel sheet pile 10 that has already been driven. A chuck device 12 is mounted on the press machine main body 11 so as to be movable up and down, and the auger casing 8 and the U-shaped steel sheet pile 10 are chucked along the outer peripheral portion of the auger casing 8 by the chuck device 12. 9A auger screw head 9Aa for digging driving, Tsu said auger casing 8 by the upper and lower driving the click device 12 and said U-shaped steel sheet pile 10 is formed of a structure to be pressed into the ground.

  More specifically, the press-fitting machine body 11 includes a saddle 22 having a plurality of clamps 21 that hold and support the upper end of the U-shaped steel sheet pile 10 already press-fitted into the ground (as shown in FIG. The clamp 21 to be attached can be moved and adjusted left and right in the drawing, so that the U-shaped steel sheet pile 10 can be clamped at the left and right positions.), A slide base 23 that can move back and forth with respect to the saddle 22; A leader mast 24 that can be turned horizontally on the slide base 23, a chuck frame 25 that is guided by a chuck upper and lower rail (not shown) provided on the front surface of the leader mast 24, and a chuck frame with respect to the leader mast 24. And a main hydraulic cylinder 26 that drives the elevator 25 up and down.

  A large hose take-up reel 27 is attached to the press-fitting machine body 11, and a hydraulic hose 28 for supplying pressure oil to the hydraulic motor 6 </ b> A as the auger drive unit 6 is taken up on the take-up reel 27. It is supposed to be.

  Further, the reaction force from the existing U-shaped steel sheet pile 10 previously placed is taken to press-fit a new U-shaped steel sheet pile 10 into the ground, or the U-type steel sheet pile 10 is grounded only by the hydraulic pressure of the main hydraulic cylinder 26. The U-shaped steel sheet pile 10 is pressed into the auger casing 8 with the auger screw rod 9A so that the U-shaped steel sheet pile 10 can be pressed into the hard ground that is difficult to press into the ground. The steel sheet pile press-fitting device is a well-known technique as shown in Patent Documents 4 to 6 below.

  By the way, a large number of U-shaped steel sheet piles 10 are adjacent to each other while engaging their engaging ears 10b (see FIG. 6), and the U-shaped web portions 10a of the U-shaped steel sheet piles 10 adjacent to each other are alternately reversed. However, in order to be press-fitted and buried in the ground, the U-shaped steel sheet pile 10 must be chucked by the chuck device 12 with its U-shaped web portion 10a being reversed every time it moves by the width of the steel sheet pile. For this purpose, after the U-shaped steel sheet pile 10 is chucked by the chuck device 12 and embedded in the ground in the previous process, the U-shaped steel sheet pile 10 is adjacently chucked by being reversed to the chuck device 12. In order to achieve this, it is necessary to horizontally rotate the chuck device 12 by 180 °. For this purpose, in the prior art shown in FIGS. 7 and 8, the chuck device 12 is attached to the tip of the bifurcated boom portion 1. As shown in FIG. 7 or FIG. 8, the mounting members 20, 20 at the high place are removed from the lower ends of the left and right lifting wires 3, 4, and are attached to the lifting fixtures 18, 18 integrally. The ground auger 5 is released from the lifted state of the lifting wires 3 and 4, and in this open state, the chuck frame attached to the press-fitting machine body 11 via the leader mast 24 and the main hydraulic cylinder 26. 25, the earth auger 5 and the chuck device 12 that supports the auger body 7 provided with the auger drive unit 6 have not been widely known, but can be rotated horizontally within a predetermined range by appropriate drive means. Must be manipulated.

  Thus, in the prior art, in order for the earth auger 5 to be released from the lifted state by the lifting wires 3, 4, the mounting members 20, 20 at the high place are to be suspended 18, 18. The auger body 7 having an auger drive unit 6 that forms the earth auger 5 rotates together with the auger drive unit 6 by hydraulic pressure. When the motor 6A is used, the hydraulic hose 28 connected to the motor 6A may be twisted, the hoses may be entangled or damaged.

JP-A-9-77475 JP 2001-72380 A Japanese Patent Laid-Open No. 11-343097 JP 2000-1852 A JP 2000-1851 A JP 2017-89143 A

  In the present invention, a number of U-shaped steel sheet piles are adjacent to each other in the width direction of the steel sheet pile while engaging their engaging ears, and the U-shaped web sheet portions of the U-shaped steel sheet piles adjacent to each other are alternately reversed. An object of the present invention is to provide a U-shaped steel sheet pile press-fitting device that easily press-fits a U-shaped steel sheet pile into the ground.

  If the means for achieving the above object is shown with reference numerals in the drawings, the U-type steel sheet pile press-fitting device according to the invention of claim 1 is formed by bifurcating the tip portion 1 to the left and right. As a result, the space between the left and right sides of the bifurcated boom portion 1 is a space portion 2, and the right lifting wire 3 and the left lifting wire 4 are attached to the respective tip portions 1 a and 1 a of the left and right bifurcated boom portions 1. An earth auger 5 as a suspended object is suspended by the left and right lifting wires 3, 4, and the earth auger 5 is positioned in the space portion 2 and has an auger body 7 including an auger drive unit 6. The auger casing 8 attached to the auger body 7 and the excavating head 9a at the tip of the auger casing 8 projecting downward from the lower end of the auger casing 8 through the auger casing 8, The chuck device 12 includes a drilling rod 9 driven by the gir driving unit 6 and is supported by a press-fitting machine main body 11 supported by an already-installed steel sheet pile 10 so as to be movable up and down. The auger casing 8 and the U-shaped steel sheet pile 10 are chucked along the outer peripheral portion of the auger casing 8, and the auger casing 8 is driven by the excavation head 9 a by the excavation head 9 a and the vertical movement of the chuck device 12. And the U-shaped steel sheet pile 10 are press-fitted into the ground, a chuck device 12 is mounted on the press-fitting machine body 11 so as to be vertically movable and horizontally rotatable. The auger casing 8 and a U-shaped web portion 10a along the outer periphery of the auger casing 8 are auger casings. The U-shaped steel sheet pile 10 is chucked so as to face the side of the group 8, and a casing rotating device 13 is interposed between the auger body 7 and the auger casing 8 of the earth auger 5 or the auger casing 8 itself. The auger casing 8 is rotatably supported by the rotation device 13, and the chuck device 12 that chucks the auger casing 8 is uniquely horizontal with respect to the auger body 7 by the casing rotation device 13 via the auger casing 8. It consists of a structure provided so that rotation is possible.

  Further, the excavation rod 9 of the U-shaped steel sheet pile press-fitting device according to the invention of claim 2 comprises an auger screw rod 9A, and the auger screw head 9Aa of the auger screw rod 9A is below the lower end portion of the auger casing 8. It consists of a structure of Claim 1 in the state which protruded.

  Further, the excavation rod 9 of the U-type steel sheet pile press-fitting device according to the invention of claim 3 comprises a hammer rod 9B of a down-the-hole hammer 34 as shown in FIG. 3, and a hammer bit 9Ba at the tip of the hammer rod 9B. The structure according to claim 1, which is in a state of projecting downward from the lower end portion of the auger casing 8.

  A U-shaped steel sheet pile press-fitting device according to a fourth aspect of the present invention has the configuration according to any one of the first to third aspects, wherein the casing rotation device 13 includes a worm gear 15 that is rotated by a hydraulic motor 14. Is.

  Further, in the U-type steel sheet pile press-fitting device according to the fifth aspect of the present invention, as shown in FIG. 4B, the chuck device 12 includes a casing chuck portion 16 for chucking the auger casing 8, and an auger casing. 5. A steel sheet pile chuck portion 17 for chucking the U-shaped steel sheet pile 10 so that the U-shaped web portion 10a is aligned with the U-shaped web portion 10a is provided.

  Next, the effects of the present invention will be specifically described with reference to the drawings. First, according to the U-shaped steel sheet pile press-fitting device according to the first aspect of the present invention, the distal end portion 1 is bifurcated to the left and right, whereby the space between the left and right of the bifurcated boom portion 1 becomes a void portion 2. The right lifting wire 3 and the left lifting wire 4 are provided at the respective distal end portions 1a and 1a of the left and right bifurcated boom portions 1, and the left and right lifting wires 3 and 4 are grounds to be suspended. An auger 5 is suspended, and the earth auger 5 is located in the void portion 2 and includes an auger body 7 having an auger drive unit 6, an auger casing 8 attached to the auger body 7, and the auger casing 8. It consists of a drilling rod 9 that is driven by the auger drive unit 6 in a state where the drilling head 9a of the leading end protrudes downward from the lower end of the auger casing 8. A chuck device 12 is mounted on a press-fitting machine body 11 supported by an existing U-shaped steel sheet pile 10 that has already been driven, so that the chuck device 12 can be moved up and down. The chuck device 12 allows the auger casing 8 and the outer periphery of the auger casing 8 to The U-shaped steel sheet pile 10 is chucked along, and the auger casing 8 and the U-shaped steel sheet pile 10 are press-fitted into the ground by the excavation drive of the excavation rod 9 by the excavation head 9a and the vertical movement of the chuck device 12. In the U-shaped steel sheet pile press-fitting device, the press-fitting machine body 11 is equipped with a chuck device 12 so as to be movable up and down and horizontally rotatable. The auger casing 8 and the outer peripheral portion of the auger casing 8 are mounted on the chuck device 12. And the U-shaped steel sheet pile 10 is chucked so that the U-shaped web portion 10a faces the auger casing 8 side. The auger body 8 of the earth auger 5 and the auger casing 8 or the auger casing 8 itself is provided with a casing rotating device 13 interposed therebetween, and the auger casing 8 is rotatably supported by the casing rotating device 13. Since the chuck device 12 for chucking the auger casing 8 is provided so as to be horizontally rotatable with respect to the auger body 7 by the casing rotating device 13 via the auger casing 8, the chuck device 12 is connected to the press-fitting machine body 11. The auger casing 8 and the U-shaped steel sheet pile 10 which are chucked by the chuck device 12 supported so as to be horizontally rotatable via a chuck rotation support frame 29 are simultaneously press-fitted into the ground with respect to the chuck frame 25 being held. When it is dug to a predetermined depth, the U-shaped steel sheet pile 10 is buried in the ground. In this state, only the auger casing 8 is pulled out to the ground, and in this state, the main hydraulic cylinder 26 and the chuck frame 25 and the chuck device 12 connected thereto are connected by the slide base 23 of the press-fitting machine body 11. Move forward by the width of the existing U-shaped steel sheet pile 10 buried in the ground, and operate the casing rotating device 13 at this advanced position to rotate the auger drive unit 6 and the auger body 7 of the earth auger 5. Instead, only the auger casing 8 and the chuck device 12 chucking the auger casing 8 are rotated in the horizontal direction over a range of 180 °.

  Then, the orientation of the U-shaped web portion 10a is reversed with respect to the existing U-shaped steel sheet pile 10 with the auger casing 8 sandwiched between the chuck device 12 rotated in the range of 180 ° in this way. Thus, the new U-shaped steel sheet pile 10 can be chucked.

  Therefore, following the process of placing a large number of U-shaped steel sheet piles 10 in the ground, the casing rotating device provided between the auger body 7 and the auger casing 8 of the earth auger 5 or between the auger casing 8 itself. 13, while easily reversing the directions of the U-shaped web portions 10 a of the U-shaped steel sheet piles 10 adjacent to each other, the engaging ear portions 10 b of the U-shaped steel sheet pile 10 are engaged with each other efficiently. The U-shaped steel sheet pile 10 can be driven into the ground.

  In addition, since the auger drive unit 6 and the auger body 7 of the earth auger 5 do not rotate at all, when the auger drive unit 6 is composed of a hydraulic motor 6A, the hydraulic hose 28 connected thereto is twisted, There is no damage.

  Further, the excavation rod 9 of the U-shaped steel sheet pile press-fitting device according to the invention of claim 2 comprises an auger screw rod 9A, and the auger screw head 9Aa of the auger screw rod 9A is below the lower end portion of the auger casing 8. Since it is in a protruding state, the auger screw rod 9 can be formed directly connected to the auger drive unit 6, and thus the structure is simple, and the hard ground around the press-fit position of the U-shaped steel sheet pile 10 by the auger screw rod 9A. The U-shaped steel sheet pile 10 can be easily press-fitted into a hard ground where it is difficult to press-fit the U-shaped steel sheet pile 10.

  Further, the excavation rod 9 of the U-type steel sheet pile press-fitting device according to the invention of claim 3 comprises a hammer rod 9B of a down-the-hole hammer 34 as shown in FIG. 3, and a hammer bit 9Ba at the tip of the hammer rod 9B. Can be easily drilled even on hard or ultra-hard ground where rocks, gravel layers, boulders, concrete, etc. are present. The U-shaped steel sheet pile 10 can be easily press-fitted into the super-hard ground where it is difficult to press-fit the type steel sheet pile 10.

  According to the U-shaped steel sheet pile press-fitting device according to the fourth aspect of the present invention, the casing rotating device 13 includes the worm gear 15 that is rotated by the hydraulic motor 14. The casing rotating device 13 can be easily operated. In addition, the auger casing 8 and the chuck device 12 are firmly fixed without being shaken by the locking action of the worm gear 12 at a position where the auger casing 8 and the chuck device 12 are rotated by 180 ° by the lock mechanism of the worm gear 12. And the press-fitting operation of the U-shaped steel sheet pile 10 can be performed satisfactorily.

  According to the U-shaped steel sheet pile press-fitting device according to the fifth aspect of the present invention, the chuck device 12 includes the casing chuck portion 16 for chucking the auger casing 8 and the U-shaped web portion 10 a along the auger casing 8. Thus, since it consists of the steel sheet pile chuck part 17 which chucks the U-shaped steel sheet pile 10, the auger casing 8 and the U-shaped steel sheet pile 10 along this can be accurately chucked by the chuck device 12.

It is a front view which shows the steel sheet pile press-in apparatus which concerns on this invention. It is a vertical front view of the casing rotating apparatus which shows the principal part of this invention. It is a vertical front view which shows other embodiment of the excavation rod with which the said casing rotation apparatus of the principal part of this invention is equipped. (A) is a cross-sectional top view of the casing rotating apparatus which shows the principal part. (B) is a cross-sectional top view of the chuck apparatus which is the other principal part of this invention. (A) is a cross-sectional top view of the casing rotating apparatus which shows the operation state of the principal part. (B) is a cross-sectional top view which shows the operating state of the chuck apparatus which is the other principal part. A chuck device is attached to the saddle of the main body of the press machine clamped by a number of existing steel sheet piles that are driven into the ground by a steel sheet pile press-in device, and the state in which new steel sheet piles are sequentially driven by this chuck device. It is explanatory drawing shown. It is a front which shows the conventional steel sheet pile press-fitting device. It is a perspective view which shows the use condition.

  As shown in FIG. 1, the steel sheet pile press-fitting device according to the present invention supports the chuck device 12 with respect to the chuck frame 25 via a chuck rotation support frame 29 so as to be horizontally rotatable.

  As shown in FIG. 4 (b), the chuck device 12 includes a chuck body 30, casing chuck parts 16, 16 mounted on the chuck body 30, and a steel sheet pile chuck part 17 that chucks the U-shaped steel sheet pile 10. . In addition, a fixed portion 31 and a pair of convex portions 32, 32 project from the outer peripheral portion of the auger casing 8 in correspondence with the radial direction. Of these, the casing chuck portions 16, 16 are provided on the chuck cylinders 16a, 16a. The pair of convex portions 32 and 32 projecting from the outer peripheral portion of the auger casing 8 are chucked by the driving force, and the steel sheet pile chuck portion 17 projects from the outer peripheral portion of the auger casing 8. The U-shaped steel sheet pile 10 is chucked with the web portion 10a facing the fixed portion 31 side of the auger casing 8 therebetween. It has come to be.

  The auger casing 8 and the U-shaped steel sheet pile 10 are inserted into the chuck device 12, the auger casing 8 is chucked by the casing chuck portions 16, 16, and the U-shaped steel sheet pile 10 is simultaneously chucked by the steel sheet pile chuck portion 17. In FIG. 4B, the auger screw rod 9A, which is an example of the excavating rod 9, is provided with screw blades 9Ab, and the exhaust generated in the auger casing 8 is provided between the convex portions 32, 32 of the auger casing 8. A soil discharge port 39 and a soil discharge passage 40 for discharging the soil from the chuck body 30 to the outside are provided.

  Accordingly, the main hydraulic pressure that drives the chuck frame 25 in which the auger casing 8 and the U-shaped steel sheet pile 10 that are simultaneously chucked by the chuck portions 16 and 17 of the chuck device 12 to each other through the chuck rotation support frame 29 to move up and down. The cylinder 26 is lowered and lowered for a predetermined distance, and at the predetermined lowered position, only the U-shaped steel sheet pile 10 is released from the chucked state of the steel sheet pile chuck portion 17 so that the U-shaped steel sheet pile 10 remains in the pressed-in position. While being chucked by the casing chuck part 16, the chuck device 12 is driven up by the main hydraulic cylinder 29, and the upper side of the U-shaped steel sheet pile 10 is again chucked by the steel sheet pile chuck part 17 at the raised position, and lowered. In this way, the U-shaped steel sheet pile is repeatedly generated by repeatedly driving the chuck device 12 up and down. When 0 is press-fitted into the ground and dug to a predetermined depth, the U-shaped steel sheet pile 10 is left buried in the ground, and only the auger casing 8 is pulled out to the ground. By the slide base 23, the main hydraulic cylinder 26 and the chuck frame 25, the chuck device 12 connected thereto, and the auger casing 8 are moved forward by the width of the U-shaped steel sheet pile 10.

  By the way, as shown in FIG. 4 (b), the U-shaped steel sheet pile 10 is formed into a plane shape by a U-shaped immersive web 10a, inclined portions 10c on both sides thereof, and engagement ear portions 10b on both edges thereof. As shown in FIG. 6, when the U-shaped steel sheet pile 10 is driven into the ground with the immersive surface side of the U-shaped immersive web 10a facing the fixed portion 31 side of the auger casing 8, As shown, in the adjacent position where the steel sheet pile 10 has moved forward by the width sound, the U-shaped steel sheet pile 10 previously placed is placed in the ground in the opposite direction as shown in the figure, The engaging ears 10b and 10b are engaged and connected to each other.

  For this purpose, the direction of the U-shaped steel sheet pile 10 chucked by the chuck device 12 shown in FIG. 4B is changed from downward in the drawing to upward in the drawing as shown in FIG. 5B. It is necessary to rotate the chuck device 12 so as to be chucked in this state.

  For this purpose, after the main hydraulic cylinder 26 and the chuck frame 25, the chuck device 12 connected thereto, and the auger casing 8 are moved forward by the width of the U-shaped steel sheet pile 10, as shown in FIG. 8 is operated, and the chuck device 12 is rotated within a range of 180 ° from the state shown in FIG. 4B from the state shown in FIG. The direction of the sheet steel sheet pile 10 can be chucked at an upward position in the figure.

  In the present embodiment, as shown in FIG. 1, a casing rotating device 13 is interposed between the auger body 7 and the auger casing 8 of the earth auger 5 or the auger casing 8 itself. The auger casing 8 chucked by 12 is provided so as to be horizontally rotatable together with the chuck device 12 with respect to the auger body 7.

  As a result, the auger body 7 including the auger drive unit 6 connected to the bifurcated boom portion 1 does not rotate at all, and only the lower auger casing 8 of the casing rotating device 13 rotates.

  Then, the chuck device 12 for chucking the auger casing 8 with the casing chuck portion 16 rotates integrally with the rotation of the auger casing 8, and the orientation of the U-shaped steel sheet pile 10 is illustrated as shown in FIG. The chuck state is converted to mid-up.

  The main hydraulic cylinder 26 and the chuck frame 25 connected thereto do not rotate, and only the chuck device 12 is rotatably supported by the chuck rotation support frame 29 and rotates.

  In the present embodiment, a worm gear 15 that is operated by a hydraulic motor 14 is employed as the casing rotating device 13 as shown in FIGS. Therefore, the worm gear 15 can be operated only by operating the hydraulic motor 14, and the casing rotating device 13 can be easily operated. In addition, due to the unique locking action of the worm gear 15, the auger casing 8 and the chuck device 12 can be firmly fixed at the position where the auger casing 8 and the chuck device 12 are rotated by 180 ° without being shaken. The press-fitting operation of the sheet pile 10 can be performed satisfactorily and accurately. Of course, the casing rotating device 13 is not limited to the above-described structure, and the casing rotating device 13 can also be configured by a rotating mechanism using an electric motor or a hydraulic cylinder. In short, any rotational drive source capable of rotationally driving the auger casing 8 may be used.

  Specifically, as shown in FIG. 2 or 3, a worm gear support frame 35 is fixed to an auger body 7 having an auger drive unit 6 that is an earth auger 5 by a fixture 36 such as a bolt, and the auger drive unit 6. The auger casing 8 through which the excavating rod 9 actuated by is cut off the edge of the auger body 7 and the worm wheel 37 is fixed to the outer periphery thereof, and the worm 38 is engaged with this, and FIG. As shown, the worm 38 is driven by the hydraulic motor 14.

  In FIG. 2, the auger screw rod 9 </ b> A that is the excavating rod 9 is directly connected to the auger driving unit 6 of the earth auger 5, but the configuration is not limited to this. As described above, the down-the-hole hammer 34 may be provided inside the auger casing 8. Specifically, a male screw part a is formed on the outer peripheral part of the excavating rod 9 connected to the auger drive part 6 of the earth auger 5, and a female screw part b is formed on the inner peripheral part of the hammer casing 34a of the down the hole hammer 34. The hammer casing 34a is connected to the excavation rod 9 connected to the auger drive unit 6 by screw connection, and the hammer piston 34b and the hammer rod 9B connected to the hammer piston 34b are arranged inside the hammer casing 34a. A hammer bit 9Ba protruding from the lower end of the auger casing 8 may be attached to the tip of the auger casing 8. The hammer bit 9Ba is driven to excavate by the rotational force of the hammer casing 34a connected to the excavation rod 9 and the vertical vibration force by the hammer piston 34b in the hammer casing 34a, and the crushing force excavates the super hard ground to soften it. The U-type steel sheet pile 10 can be pressed into the softened ultra-hard ground.

  Then, in order to change the orientation of the chuck device 12 in the state of FIG. 4B by the worm gear 15 of FIG. 2 or 3A, the worm gear 15 as shown in FIG. As shown in FIG. 5B, the orientation of the U-shaped steel sheet pile 10 chucked by the chuck device 12 is set to 180 ° so that the U-shaped immersive web 10a faces upward in the drawing. Rotate within the range.

  That is, as shown in FIG. 6, after the chuck device 12 is moved forward by the width of the steel sheet pile 10, the auger casing 8 is interposed between the auger casing 8 as shown in FIG. 4 (b), the chuck device 12 is rotated within a range of 180 ° as shown in FIG. 5 (b) to change the direction of the U-shaped steel sheet pile 10 upward in the figure. Yes. The timing at which the U-shaped steel sheet pile 10 is chucked by the steel sheet pile chuck portion 17 of the chuck device 12 may be either before or after the direction of the chuck device 12 is rotationally displaced. In this case, since it is not necessary to change the direction of the U-shaped steel sheet pile 10 that is lifted by the boom of the crane, it is easy to insert the U-shaped steel sheet pile 10 into the chuck device 12, but the U-shaped steel sheet pile 10 is long. In addition, since the U-shaped steel sheet pile 10 having a weight accompanying the rotation of the chuck device 12 has to be rotated, the burden on the chuck device 12 increases accordingly. On the other hand, in the latter case, since it is necessary to change the direction of the U-shaped steel sheet pile 10 lifted by the boom of the crane, it is difficult to insert the U-shaped steel sheet pile 10 into the chuck device 12. Since the weight of the U-shaped steel sheet pile 10 is not loaded during the rotation, there is an advantage that there is no load on the chuck device 12.

  When the U-shaped steel sheet pile 10 is driven into the ground with the U-shaped immersive web 10a facing one side, the U-shaped steel sheet pile 10 is moved to the adjacent position where the U-shaped steel sheet pile 10 has moved forward by the width sound. As shown in the figure, they are driven in the ground in opposite directions, and the engaging ears 10b, 10b of both are engaged and connected to each other.

  In this way, when the U-shaped steel sheet pile 10 is driven into the ground, and subsequently a new U-shaped steel sheet pile 10 is driven at an adjacent position, the chuck device 12 is rotated by the casing rotating device 13 for a predetermined rotation distance. Only the direction of the U-shaped steel sheet pile 10 can be easily converted, and the operation can be performed smoothly and efficiently.

DESCRIPTION OF SYMBOLS 1 Bifurcated boom part 2 Cavity part 3 Right lifting wire 4 Left lifting wire 5 Earth auger 6 Auger drive part 7 Auger main body 8 Auger casing 9 Drilling rod 9a Drilling head 9A Auger screw rod 9Aa Auger screw head 9B Hammer rod 9Ba Hammer bit 10 U-shaped steel sheet pile 10
DESCRIPTION OF SYMBOLS 10a U-shaped immersion web part 10b Engagement ear part 11 Press-fit machine main body 12 Chuck apparatus 13 Casing rotation apparatus 14 Hydraulic motor 15 Worm gear 16 Casing chuck part 17 Steel sheet pile chuck part 34 Down the hole hammer

Claims (5)

For the tip lateral bifurcated, whereby the between the right and left forked boom portion has a cavity portion, the right lifting wires and left lifting the tip of each of the bifurcated boom portion of the left and right An earth auger, which is a suspended object, is suspended by these left and right lifting wires, the auger body having an auger drive unit located in the above-mentioned space, and attached to the auger body An auger casing, and a drilling rod that is driven by the auger drive unit with the excavation head at the tip of the auger casing projecting downward from the lower end of the auger casing. A chuck device is mounted on the press-fitting machine body supported by the existing steel sheet pile so as to be movable up and down. A gar casing and a U-shaped steel sheet pile are chucked along the outer peripheral portion of the auger casing, and the auger casing and the U-shaped steel sheet pile are grounded by a digging drive by a digging head of a digging rod and a vertical drive of the chuck device. In the U-type steel sheet pile press-fitting device that is press-fitted inside,
A chuck device is mounted on the press-fitting machine body so as to be movable up and down and horizontally rotatable. The auger casing and the U-shaped web portion along the outer periphery of the auger casing are directed to the auger casing side. The U-shaped steel sheet pile is chucked
A chuck device that chucks the auger casing between the auger body of the earth auger and the auger casing, or the auger casing itself is provided with a casing rotation device interposed therebetween, and the auger casing is rotatably supported by the casing rotation device. A U-shaped steel sheet pile press-fitting device provided by the casing rotating device through the auger casing so as to be independently horizontally rotatable with respect to the auger body.
  The U-shaped steel sheet pile press-fitting device according to claim 1, wherein the excavation rod is formed of an auger screw rod, and an auger screw head of the auger screw rod projects downward from a lower end portion of the auger casing.   2. The U-shaped steel sheet pile press-fitting device according to claim 1, wherein the excavation rod is a hammer rod of a down-the-hole hammer, and a hammer bit at a tip portion of the hammer rod protrudes downward from a lower end portion of the auger casing.   The U-shaped steel sheet pile press-fitting device according to any one of claims 1 to 3, wherein the casing rotating device includes a worm gear that is rotated by a hydraulic motor.   The chuck device includes a casing chuck portion that chucks the auger casing, and a steel sheet pile chuck portion that chucks the U-shaped steel sheet pile so that the U-shaped web portion is along the auger casing. A U-shaped steel sheet pile press-fitting device according to the above.

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