JP3877320B2 - Steel sheet pile continuous placing method to hard rock formation, and equipment used for the method - Google Patents

Description

  The present invention makes it possible to create a continuous wall with a steel sheet pile for retaining rocks in order to prevent sediment collapse in hard rocks and large rock formations, making it difficult or impossible for auger screw drilling. The present invention relates to a construction method that enables continuous placement of steel sheet piles by continuous lapping with a danza hole hammer drilling in the stratum, and machines and equipment (devices) used in the construction method. It belongs to the technical field.

In order to drive a steel sheet pile into a hard rock formation, a steel sheet pile driving hole is formed in advance, and a steel sheet pile is driven into the drill hole. Therefore, auger screw drilling is impossible, and drilling is performed by crushing the formation with a leaderless drilling machine equipped with a danza hole hammer at the drilling shaft tip or a leader drilling machine.
And in order to form steel sheet pile retaining walls by continuous steel sheet pile driving, it is necessary to continuously form a steel sheet pile driving hole in a lap form, for example, a danza hole hammer hole in a hard rock formation Even if it forms continuously, unless the uniform lap drilling part is formed between each drilling hole, continuous driving of the steel sheet pile with the present vibration pile driving machine is impossible.

However, even if we attempt lap drilling in a hard rock formation with a leaderless drilling machine equipped with a danza hole hammer, use a large machine to wrap with a danza hole hammer under the forced guidance of the drilling axis by the leader. Even if drilling is attempted, the dancer hole hammer is a method of crushing hard rocks by moving the bit up and down. It is impossible to perform continuous lap drilling with a uniform lap drilling part that shifts to the side of few adjacent existing drilled hole holes. Does not exist.
Therefore, the continuous wall construction for mountain retaining for a stratum drilled with a danza hole hammer, such as a hard rock strata, is currently carried out by a combined method using a parent pile (H-shaped steel) and a cross sheet pile.

11A and 11B show the main pile and the lateral sheet pile combined construction method cited as the conventional example 1. FIG. 11A is a front view, FIG. 11B is a top view, and FIG. 11C is a schematic diagram of a danza hole hammer.
That is, the continuous wall construction for mountain retaining to hard rock formation uses a drilling shaft in which a danza hole hammer is attached to the tip of an auger screw or a cylindrical body (not shown). 10.5 kg / cm ² ) by applying a vertical movement to a danza hole hammer that rotates slowly (10-30 rpm), and crushing and crushing hard rock with a powerful falling impact force of the hammer bit, Independent drilling holes are formed at regular intervals of 1 to 2 m.

  Next, H-shaped steel as the main pile is driven into each drilling hole, and one side (surface) of the H-shaped steel row driven at regular intervals is excavated and excavated with an excavator. A fixed-length horizontal sheet pile such as a wooden board is fitted into the main pile span), and a predetermined depth is obtained by repeating the excavation and earth removal work with a depth of around 1 m that does not cause natural ground collapse and the insertion of the horizontal sheet pile to the earth removal surface. To the excavated floor, a continuous wall for retaining is constructed by using a main pile (H-shaped steel) and a horizontal sheet pile fitted and locked between the main piles. It prevents the collapse.

FIG. 12 is cited as a patent document and discloses a concept of continuously forming a hole for driving a steel sheet pile in an auger screw drilling for a normal soft ground layer.
That is, as shown in FIG. 12 (A), the guide device arranged at the tip of the auger is brought into contact with the end of the already loaded steel sheet pile and guided by the leader at the base of the auger (motor). 12 (B) discloses a concept in which each hole is continuously formed in a uniform adjacent form, and steel sheet piles are continuously driven.
JP 2001-55882 A

In the conventional example 1 shown in FIG. 11, that is, in the current method of using the main pile and the lateral sheet pile, the fixed interval drilling by the danza hole hammer drilling machine → the master pile (H-shaped steel) driving into the drilling → the parent The process of excavating and discharging one side of the pile row → passing and fitting between the piles of the horizontal sheet piles is necessary, which is complicated and complicated.
In particular, when fitting and placing the horizontal sheet piles between the H-shaped steels, it is an operation while preventing the collapse of the earth and sand during excavation, so it corresponds to the excavation soil of about 1 m depth and the excavation depth (1 m). It is a work to be carried out to a predetermined depth by repeated repetition with the insertion work of the side sheet pile, such as disasters such as collapse of the non-excavation formation on the back side of the parent pile row to the excavation soil side on the surface side of the parent pile row, etc. It is difficult work with the risk of accidents, and the efficiency of the work is poor.

The construction method of the conventional example 2 shown in FIG. 12 is for a soft stratum that can be drilled only by rotating an auger screw as a drilling shaft. This is not a technique that suggests application to a danza hole hammer drilling that discharges soil from the drilling hole to the ground. For example, as shown in FIG. 12 (B), even if each drilling hole can be formed in a uniform continuous form, If it is a stratum, it is impossible to continuously place steel sheet piles in hard strata over soft rocks and medium hard rocks.
In other words, even in the case of uniform continuous drilling, each drilling hole has considerable drilling lap, and the area around the driven part of each steel sheet pile section is crushed soft soil by overlapping (lapping) drilling. Unless this is the case, continuous placement of steel sheet piles is impossible.

  The present invention provides a novel structure capable of freely applying rotation and vibration to the same output shaft for hard formations that cannot be drilled with an earth auger screw, such as formations with large boulders, hard rocks, medium hard rock formations, etc. A single civil engineering foundation machine equipped with a simple vibration auger machine enables continuous lapping and vibration placement of steel sheet piles, enabling smooth continuous placement of steel sheet piles in hard rock formations. For example, as shown in FIG. 11, the conventional technique for building a continuous wall for retaining a mountain to a hard strata is dramatically improved, and there is no fear of disaster or accident, and the construction of a continuous wall for retaining a mountain, The technology to enable excavation and soil removal along the mountain retaining wall with high efficiency.

  The invention of the steel sheet pile continuous placing method to the hard rock formation GH of the present application is, for example, as shown in FIG. 2 (A), a vibration auger machine 1 to which a drilling shaft 2 provided with a conventional dancer hole hammer 3 'is connected. 3D, and then, as shown in FIG. 3D, the steel sheet pile P is vibrated into the hole C1 by the vibration auger machine 1 connected to the chuck 10 for gripping the steel sheet pile, As shown in FIG. 1, the section guide 5 of the dancer hole hammer 3 is engaged with the section PE of the existing steel sheet pile P by the vibration auger machine 1 to which the drilling shaft 2 provided with the dancer hole hammer 3 having the section guide 5 is connected. In combination, the hammer hole hammer 3 is blown and drilled to a predetermined depth under the guidance of the steel sheet pile section PE to form a continuous lap hole C2 having a hole lap Cw in the existing hole C1. Hole shaft 2 After rising removed by vibration auger machine 1 connected to the chuck 10, and implanting into the continuous wrap drilling C2 section PE of new sheet piles P engages the section PE of the existing sheet piles P.

The hard rock formation GH is a hard formation that cannot be drilled with an earth auger drilling machine, such as a hard rock or a large boulder layer, or another soil and hard rock or a large boulder layer. It is a general term.
In addition, as shown in FIGS. 1 and 10, the “drilling wrap Cw” is a portion where the drilling holes C1 and C2 on both sides overlap each other, and was subjected to the drilling action twice when forming each drilling on both sides. “Continuous lap drilling hole C2” means a form in which the respective drilling holes C1 and C2 are continuous while maintaining the drilling hole lap Cw, and each steel sheet pile P that is continuously driven in a sectional form as shown in FIG. This is a drilling configuration in which all flat plate portions PF, inclined portions PS, and all including section PE are accommodated in the drilling holes C1 and C2.

Further, as shown in FIG. 3, the vibration auger machine 1 has a vibration portion 13 arranged in series with a conventional hydraulic auger 11 and a rotary action for the drilling shaft 2 and a pile driving for the hydraulic chuck 10 on the output shaft 14b. It is a work machine that can be given vibration action for.
Moreover, the section guide 5 should just be able to engage and slide by engaging with the steel sheet pile section PE, and may have any cross-sectional shape that can be fitted and locked to the cross-sectional shape of the section PE of the steel sheet pile.
Further, since one vibration auger machine 1 can be used as a drilling machine by connecting the drilling shaft 2 or by connecting a hydraulic chuck 10 for gripping steel sheet piles, it can be used as a vibration pile driving machine. The output shaft 14b of the machine 1 can be detachably connected to the drilling shaft 2 and the chuck 10 by a simple attachment / detachment mechanism such as pin attachment.

  Therefore, according to the present invention, as shown in FIG. 9C, the dancer hole hammer 3 is guided by the steel sheet pile section PE by the section guide 5, so that the lapping to the hard rock formation GH is performed as shown in FIG. The hole C2 can be formed with a continuous lap-shaped hole C2 having a uniform hole wrap Cw from the upper end to the lower end and having a lap amount as set by a small leaderless auger machine. By setting an appropriate drilling wrap Cw by selecting the diameter of the hammer bit 6 and the protruding length of the section guide 5 based on the continuously driven cross-sectional shape, energy-saving vibration driving of the steel sheet pile P can be performed.

  Moreover, since the vibration auger machine 1 is a working machine that exhibits a drilling action by rotation and a pile driving action by vibration, the drilling shaft 2 and the steel sheet pile to the output shaft 14b as shown in FIG. By exchanging with the chuck 10 for gripping, it can be used as both a danza hole hammer drilling machine and a vibration pile driving machine, replacing the drilling work machine and the vibration work machine with the conventional leaderless basic machine. Such complicated and time-consuming preparation work can be omitted, the operating rate of the machine is improved, and the working efficiency is improved.

Further, in the steel sheet pile continuous driving method of the present invention, as shown in FIG. 1 (B), the cylindrical section guide 8 is drilled when the dancer hole hammer 3 having the section guide 5 is buried in the ground. It is loosely fitted on the outer periphery of the shaft 2 and mounted on the ground GL, and is fixed to the existing steel sheet pile P. The drill shaft 2 is guided by the section guide 5 of the dancer hole hammer 3 and the cylindrical section guide 8. It is preferable to perforate.
Incidentally, the danza hole drilling machine (danzer hole hammer drilling machine) is usually a special machine (not shown) mounted on the distal end of the cylindrical shaft body and mounted on the proximal end working machine, and FIG. As described above, there is a danza hole drilling machine in which the screw head at the tip of an auger drilling machine in which an earth auger screw is attached to the proximal drilling machine is replaced with a danza hole hammer. "Axis 2" is meant to include all of the drill hole drill shafts with the tip of a dancer hole hammer.
Further, the cylindrical section guide 8 is loosely fitted to the outer periphery of the drilling shaft 2 to allow the vertical insertion of the drilling shaft 2, so that when the shaft main body to which the dancer hole hammer is mounted is an auger screw, The height of the cylindrical section guide 8 needs to be a height of 1 pitch or more in order to suppress rattling, and when the drilling shaft main body is a cylindrical shaft, the cylindrical height of the cylindrical section guide 8 can be freely selected. .

According to the present invention, even when the dancer hole hammer 3 enters deep into the ground, the dancer hole hammer drilling shaft 2 is guided by the section guide 5 at the tip of the dancer hole hammer and the ground by the cylindrical section guide 8. Since it becomes the guide drilling up and down with the guide at the GL position, it is possible to suppress the bending at the middle part of the drilling shaft 2 and to control the posture of the dancer hole drilling shaft that performs vertical vibration drilling, The continuous lapping operation can be performed smoothly, and the wear of the members, particularly the wear of the section guide 5 fixed to the dancer hole hammer can be suppressed.
Therefore, not only a large leader type dancer hole drilling machine, but also a small leaderless dancer hole drilling machine enables predetermined uniform continuous lap drilling to the hard rock formation GH, and the steel sheet pile is smooth. Continuous casting is possible, and steel sheet pile continuous wall construction for mountain fastening can be carried out safely and with epoch-making high efficiency.

Further, as shown in FIG. 8, the cylindrical section guide 8 is a two-part open / close cylindrical ring body 82 having a section guide piece 80, and engages the section guide piece 80 with a section PE of an existing steel sheet pile. Preferably, the section guide piece 80 is fixed to the steel sheet pile section PE to guide the drilling shaft 2 while being loosely fitted and closed on the outer periphery of the drilling shaft 2 and placed on the ground.
In this case, if a screw hole (not shown) is arranged in the section guide piece 80, a screw bolt is screwed in, and the bolt tip is pressed against the steel sheet pile section PE, the section guide piece 80 is attached to the steel sheet pile section PE. Fastening is possible.

Therefore, since the cylindrical section guide 8 is a two-part open / close type, after the section guide piece 80 is fitted and locked to the section PE of the steel sheet pile protruding portion, the cylindrical section guide 8 can be loosely fitted and closed on the outer periphery of the drilling shaft 2. In addition, since the section guide piece 80 is fixed to the steel sheet pile section PE, the crushed soil is discharged and discharged from the bottom of the drilling hole, and the drilling shaft 2 is fixed. Thus, the vertical movement of the cylindrical section guide 8 affected by the vertical vibration of the drilling can be suppressed, and the drilling shaft 2 can be smoothly guided.
In this case, the two-divided cylindrical ring body 82 is advantageously closed and opened by insertion and removal at the connecting pin P8. Also, as shown in FIG. If it is used together in the form of attachment, it is possible to cope with changes in the diameter of the drilling shaft 2 or sliding wear by replacing the inner ring body 83, which is advantageous.

Further, as shown in FIG. 1C, when the next drilling shaft 2 is added to the drilling shaft 2 that has entered the soil, an adapter 9 with a section guide piece 94 as shown in FIG. The guide piece 94 is preferably engaged with the section PE of the existing steel sheet pile P to connect the drilling shafts 2 to each other.
In this case, the dancer hole hammer drilling shaft 2 guides the section guide 5 of the dancer hole hammer 3 and the section guide 94 of the adapter 9 at the drilled shaft addition position with the steel sheet pile P. The bending in 2 can be suppressed, and a smooth hole-drilling action with little deflection displacement is achieved.

Therefore, even if the drilling shaft 2 in which the screw head of a conventional auger screw is replaced with the dancer hole hammer 3 is employed, the wear damage of the auger screw can be minimized.
In this case, the cylindrical section guide 8 may be used in combination as necessary. If the cylindrical section guide 8 is used for drilling, the cylindrical section guide 8 is removed when the drilling shaft 2 is added, and the section is removed. The cylindrical section guide 8 may be rearranged as necessary when the adapter 9 with guide enters the ground.

  6 and 9, the section guide 5 of the dancer hole hammer 3 includes a right section guide piece 5a and a left section guide piece 5b, and the engagement of the right section guide piece 5a to the steel sheet pile section PE. At the time, as shown in FIG. 10, the center point Oc of the danza hole hammer (center point of the hammer bit 6) Oc is shifted to the right side from the steel sheet pile meshing center line OO by the distance d1 to the steel sheet pile section PE of the left section guide piece 5b. When engaging, it is preferable to drill a hole at the center point Oc of the dancer hole hammer by shifting the distance d1 from the steel sheet pile meshing center line OO to the left.

In this case, “right side” means the right side when viewed in the construction progress direction of FIG.
As shown in FIG. 10, the steel sheet pile P has a trapezoidal shape in which the cross-sectional shape is a flat plate portion PF and the inclined plate portions PS on both sides, and the distal ends of the inclined plate portions PS on both sides are bent to have the engagement grooves PG. It has section PE, and the continuous wall of the steel sheet pile is connected by engaging the section PE in a form in which the flat plate portion PF protrudes alternately to the right side and the left side from the steel sheet pile meshing center line OO position. is there.
Accordingly, the “right section guide” means a section guide that is engaged with the section PE when forming the hole C2 for the steel sheet pile P protruding rightward from the center line OO.

Further, in the drilling holes C1 and C2 for driving steel sheet piles, the smaller the hole diameter, that is, the smaller the diameter of the hammer bit 6, the smaller the consumption of drilling power, which is advantageous.
In this case, since the section guide 5 is provided for the right side and the left side, the section guide pieces 5a and 5b are selectively used both when drilling the right protruding steel sheet pile and when drilling the left protruding steel sheet pile. As a result of the displacement arrangement of the center point Oc of the dancer hole hammer, as shown in FIG. 10, the entire steel sheet pile P projecting alternately left and right under a small hole diameter (hammer bit diameter) with less power consumption. It is possible to form a row of continuous lapping holes C2 that can be accommodated, and to rationally form a row of continuous lapping holes C2 having a minimum diameter necessary for continuous placement of the steel sheet pile P.

In addition, each steel sheet pile P is preferably driven into each corresponding hole C1, C2 while being shifted rearward in the traveling direction F with respect to each corresponding hole C1, C2.
In this case, the section guide 5 of the dancer hole hammer 3 and the section guide piece 94 of the adapter 9 that descend in the ground as the vibration auger machine 1 descends can be guided and lowered in the already cut holes C1 and C2. It is possible to suppress the drilling resistance due to the protrusion to the drilling shaft 2 to a negligible level.
Moreover, the hammer bit 6 can form a necessary and sufficient drilling wrap Cw region in a non-contact state with the steel sheet pile section PE.

The first drilling hole C1 and the corner drilling hole C1 are preferably drilling shafts 2 equipped with a conventional dancer hole hammer 3 'and have a larger diameter than the intermediate drilling hole C2.
As shown in FIG. 10, the “intermediate drilling hole C2” refers to all the drilling holes C2 other than the first drilling hole C1 and the corner drilling hole C1 in the drilling row in the group of continuous lapping holes C1 and C2. means.
The first hole C1 and the corner hole C1 are required to have a steel sheet pile continuous wall positioning function, and the hole C1 serving as a reference for the hole array is larger in diameter than the intermediate hole C2. For this reason, the first steel sheet pile P is shifted backward in the construction progress direction F and driven into the hole C1, so that the adjacent hole C2 can be sufficiently cut without risk of contact with the steel sheet pile section PE of the hammer bit 6. It can be formed under the hole wrap Cw holding.

Further, at the corner portion, as shown in FIG. 10 (B), the engagement connection form of the steel sheet pile P is different from that of the straight portion, but the large-diameter hole C1 is independently drilled prior to the front and rear holes C2. Thus, the continuous lapping hole at the corner can be easily formed in a form sufficient for accommodating each steel sheet pile P.
Accordingly, the continuous lapping hole C2 by the dancer hole hammer vibration auger machine 1 having the section guide 5 becomes a continuous hole only in the straight portion, and the engagement / disengagement work with the steel sheet pile section PE of the section guide 5 becomes easy. The setting of the drilling lap Cw is facilitated, the continuous lap drilling can be accurately performed with the intermediate drilling C2 having a small drilling power, and the operation cost can be reduced.

As shown in FIG. 3 and FIG. 4, the drilling pile driving machine directly used for carrying out the invention of the steel sheet pile continuous driving method of the present application has an oscillating portion 13 interposed and fixed between an auger body 11 and a swivel portion 14. the output shaft 14b of the vibration auger machine 1 described, via a detaching mechanism portion P14, a Danza hole hammer drilling shaft 2, and a steel sheet pile gripping chuck 10 and replaceable mounted, a drive motor M11 of the auger body 11, As a drive system that is independent of the drive motor M13 of the vibration unit 13, it is used as a drilling machine when the dancer hole hammer drilling shaft 2 is connected to the output shaft 14b, and for gripping a steel sheet pile on the output shaft 14b. A vibration auger machine 1 that can be used as a vibration pile driver when the chuck 10 is connected is provided.

In this case, the vibration part 13 may be a vibro that rotates a pair of opposed eccentric bodies to generate vertical vibrations. As shown in FIG. 4B, the basic bearing 11c at the lower end of the auger body 11 and the swivel part 14, a strong bearing 12 is interposed, and the vibration part 13 is fitted on the outer periphery of the strong bearing 12 to fix the vibration part 13 to the auger body 11 and the swivel part 14.
In addition to the hydraulic circuit port of the drive motor (hydraulic motor) M11 of the auger body, another drive port may be added to form an operating circuit for the vibration unit 13.
The attaching / detaching mechanism portion P14 of the output shaft 14b only needs to secure the upper end portion of the drilling shaft 2 and the upper end portion of the chuck 10 in a detachable manner. Typically, the drilling shaft in a conventional leaderless auger machine is used. This is a pin attachment mechanism similar to the attachment / detachment mechanism.

If the drilling pile driving machine of the present invention is used, the vibration auger machine 1 has the functions of a conventional auger machine and a vibrator (vibrator), so that it is troublesome and troublesome to replace and attach the conventional auger machine and the vibrator. The operation is not necessary, and the switching between the drilling operation by the drilling shaft 2 and the steel sheet pile driving operation by the vibrator is simply performed by the drilling shaft 2 to the output shaft 14b of the vibration auger machine 1 as shown in FIG. It becomes possible only by exchanging and replacing the chuck 10 and the steel sheet pile, and switching between the drilling work and the vibration driving work can be rationalized in the steel sheet pile continuous driving construction, and the operating rate of the basic machine is improved.
In addition, when the steel sheet pile gripping chuck 10 is attached to the output shaft 14b of the vibration auger machine 1 and used as a vibration pile driving machine, the chuck 10 can be rotated by operating the drive system of the auger body. The engagement work of the sections PE with the existing steel sheet pile P gripped by the new steel sheet pile P at 10 becomes extremely easy by adjusting the rotation of the chuck 10.

Further, a danza hole hammer suitable for carrying out the invention of the steel sheet pile continuous driving method of the present application is attached to the tip of a drilling shaft 2 having a joint portion Jm at the upper end and a hammer bit 6 at the lower end as shown in FIG. A small diameter portion 32 is formed in a case 31 on the outer periphery of the dancer hole main body 30, and the sleeve 4 cannot be moved up and down on the outer periphery of the small diameter portion 32 and can be slidably rotated, and protrudes from the outer periphery of the case 31. lest place, the sleeve 4 is obtained by fixing the section guide 5 for sheet pile sections PE engages sliding.
The section guide 5 only needs to be able to engage with the steel sheet pile section PE so as to be guided and slid. As shown in FIG. 9C, the right section guide piece 5a and the left section guide piece are provided on both sides of the holder 44. The form with 5b is preferred.

In this case, the joint portion Jm typically has the same shape as a joint portion (not shown) at the upper end of the screw head at the tip of a conventional earth auger screw.
The small-diameter portion 32 is preferably formed in the lower part of the case 31 so as not to interfere with the driving of the dancer hole body 30 (cylinder, hammer) of the conventional dancer hole hammer 3 ′.
Since the case 31 is exposed to the exhaust flow of high-pressure air for driving the hammer, the outer surface of the sleeve is flush with the surface of the case 31 as shown in FIG .

Therefore, according to the construction stratum, the present invention danza hole hammer 3 is exchanged with the screw head of the auger when it reaches the hard stratum such as hard rock while drilling the soft surface layer with a conventional earth auger screw. In addition, after drilling the hole C1 at the beginning and corner of the hole array with a conventional dancer hole hammer drilling machine, the conventional danza hole hammer 3 is formed when the intermediate continuous lap hole C2 is formed. 'Can also be used by attaching and detaching it to the danza hole hammer 3 of the present invention, and since the sleeve 4 provided with the section guide 5 is also arranged in the small diameter portion 32 of the case 31, the sleeve 4 protrudes from the outer periphery of the case 31. flat but it can be suppressed, the sleeve 4 and section guide 5 of drilling penetration resistance can be suppressed Rutotomoni, the outer periphery of the exhaust stream also case 31 of the high pressure air for hammer drive Can be made to flow in, the steel sheet pile sections PE continuous wrap drilling below the engagement slide by C2 sections guide 5 can be drilled smoothly.

In the present dancer hole hammer, the sleeve guide 41 having the upper and lower flanges f41 is fitted and fixed to the case small diameter portion 32, and the inner sleeve 42 is loosely fitted between the upper and lower flanges f41 of the sleeve guide 41. It is preferable to detachably fit the two outer sleeves 43a and 43b having a semicircular cross section on the inner sleeve 42.
The sleeve guide 41 and the inner sleeve 42 are arranged in the case small-diameter portion 32 by dividing the case 31 into a large-diameter case upper portion 31u, a case lower portion 31d, and a small-diameter portion 32. After arranging the sleeve 42, the large diameter portions 31u, 31d and the small diameter portion 32 of the case may be integrated by welding or the like, or the case 31 having the small diameter portion 32 is formed in advance as shown in FIG. The cylindrical two-divided sleeve guide 41 and the inner sleeve 42 may be disposed on the case small diameter portion 32.

Accordingly, the outer sleeve 43 that holds the section guide 5 can be restricted in vertical movement by the upper and lower flanges f41 of the sleeve guide 41, and can smoothly guide the section guide 5 on the vibrating case 31.
Since the outer sleeves 43a and 43b holding the section guide 5 are detachable with respect to the inner sleeve 42, the outer sleeves 43a and 43b are advantageous for replacement and replacement of the section guide 5 which is severely worn. By exchanging the outer sleeve without the section guide 5, as shown in FIG. 5C, it can be used as a normal dancer hole hammer 3 'that does not hold the section guide 5. The operating rate and maintainability are improved.

  In addition, as shown in FIG. 5 and FIG. 6, the dancer hole hammer 3 of the present invention has an inner sleeve 42 provided with a fitting portion a42 at an appropriate position on the outer peripheral surface, and two split outer sleeves 43a and 43b fitted on the inner peripheral surface. A fitting portion b43 corresponding to the joint portion a42 is provided, and each outer sleeve 43a, 43b is fitted to the inner sleeve 42 in a state where the fitting portion b43 of each of the divided outer sleeves 43a, 43b is fitted to the fitting portion a42 of the inner sleeve. It is preferable that the bolt is fastened.

In this case, the shape and arrangement of the fitting portions a42 and b43 can be freely set, but the fitting between the fitting portions a42 and b43 is performed between the bolt holes h43 of the outer sleeves 43a and 43b and the bolt holes h42 of the inner sleeve 42. What is necessary is just to have a function of position alignment and to restrict mutual sliding between the outer sleeve and the inner sleeve.
Therefore, the presence of the fitting portions a42 and b43 facilitates the positioning of the outer sleeves 43a and 43b to the inner sleeve 42, and facilitates the assembly and maintenance of the dancer hole hammer 3 having the section guide 5. The stress load of each fitting part a42, b43 can reduce the shear stress load on the fastening bolt, and the durability of the bolt fastening means increases.

In the present embodiment, the section guide 5 includes a right section guide piece 5a and a left section guide piece 5b, as shown in FIG. It is preferable that the fixing piece 44 </ b> C having the arc inner surface of the holder 44 is fixed to the outer periphery of the sleeve 4.
In this case, since the fixing piece 44C has an arc inner surface, the fixing to the outer periphery of the sleeve 4 can be firmly performed at an appropriate position by either welding means or screwing means.

Also, each section guide piece 5a, 5b is easily attached / detached by bolting to the flat holding piece 44P, positioning and attaching / detaching work are easy, and maintenance of the severely worn section guide 5 is easy. .
Moreover, since the section guide 5 can correspond to the left and right of the steel sheet pile section PE, the guide control by the steel sheet pile P of the dancer hole hammer 3 can be performed accurately, and drilling can be performed even if the drilling power is small as shown in FIG. The small diameter lapping hole C2 can rationally form a lapping hole array necessary for continuous sheet pile driving.

  Moreover, as shown in FIG. 8, the cylindrical section guide used in the invention of the steel sheet pile continuous driving method of the present application has a central partition plate 80w on the outer surface of a flat plate-shaped fixing plate 81 provided with cylindrical pieces tu1 on both side ends, The section guide pieces 80 on both sides are arranged in a form in which the partition plate 80w is provided with a protruding portion 80e having a bolt hole h80, and two semicircular shapes having cylindrical pieces tu2, tu3 (tu4) on both side ends. The cylindrical ring body 82 is connected with the cylindrical piece tu2 at the inner end of each cylindrical ring tu2 and the pin P8 with the cylindrical piece tu1 at the end of the fixed plate 81, and the cylindrical pieces tu3 and tu4 at the outer ends of both cylindrical ring bodies 82 are connected to each cylindrical ring. The body 82 can be pin-locked with a pin P8 while the outer periphery of the drilling shaft 2 is loosely fitted in a cylindrical shape.

The central partition plate 80w, the section guide pieces 80 on both sides, and the fixing plate 81 may be cast and formed as an integrated product. The central partition plate 80w and the section guide pieces 80 on both sides are integrally formed, and the fixing plate 81 is formed. It may be fixed by welding or the like in the mounting form.
Further, as shown in FIG. 8, the projecting form of the projecting portion 80e of the central partition plate 80w may be projected upward from the upper end level of the section guide piece 80, or may be projected up and down, and is applied to the steel sheet pile section PE. The bolt hole h80 for the contact pressing bolt S may be arranged.

  Accordingly, in the cylindrical section guide 8 of the present invention, since the section guide piece 80 exists on the fixed plate 81 having a flat plate shape, the engagement and disengagement work of the section guide piece 80 to the steel sheet pile section PE is easy, and the cylindrical section guide 8 is easy to press and fix the projecting portion 80e of the central partition plate 80w by the screw bolt S and the steel sheet pile section PE to prevent the vertical blind motion of the screw 8, and each cylindrical ring 82 is also attached to the fixing plate 81. Since it is a locking means by inserting and pulling out the pin P8 at the outer end of each cylindrical ring body 82 in order to open and close at a wide angle with the pivoting pin P8 at both ends as the rotation center, a drilling shaft such as an auger screw Although the outer diameter is approximately the same as the outer diameter of 2, the loose fitting and releasing operation on the drilling shaft 2 on the ground GL is simple and easy.

  Further, as shown in FIG. 8, the cylindrical section guide 8 includes a tongue piece 82a that protrudes horizontally and has a bolt hole h82 at appropriate positions on the upper and lower ends of the cylindrical ring body 82, and has a smaller radius of curvature than the cylindrical ring body 82. In addition, the inner ring body 83 in a two-part form including a tongue piece 83a having a bolt hole h83 protruding horizontally at upper and lower ends in place is bolted to the inner surface of the cylindrical ring body 82 between the tongue piece 83a and the tongue piece 82a. It is preferable to fasten.

In this case, an inner ring body 83 having an inner diameter corresponding to the outer diameter of each of the drilling shafts 2 is prepared, and the inner ring body 83 corresponding to the size of the drilling shaft 2 is separately assembled to one cylindrical ring body 82. This allows a rational use of the cylindrical section guide 8.
And by using the inner ring body 83 that can replace the inner peripheral part of the cylindrical section guide 8 that is subject to wear by the drilling shaft 2, the long-term durability of the expensive cylindrical ring body 82 including the section guide piece 80 can be achieved. The rationalization in terms of operation and cost of the cylindrical section guide 8 can be achieved.

  In addition, as shown in FIG. 7, the drill shaft adapter 9 that can be suitably used in the invention of the steel sheet pile continuous driving method of the present invention has a joint pin hole hj and a female joint part Jf at the lower end, a joint pin hole hj and a male at the upper end. A sleeve 92 is mounted on the outer periphery of the rod piece 90 having the joint portion Jm so as to be rotatable and cannot be moved up and down, a holder 93 is fixed on the sleeve 92, and a section guide piece 94 is detachably attached to the holder 93. It is what was attached.

  In this case, the lower end female joint portion Jf and the upper end male joint portion Jm can be pin-jointed with the respective upper end and lower end joint portions of the conventional drilling shaft 2 so that the drilling shaft 2 can be added. Since the section guide piece 94 is engaged with the steel sheet pile section PE when the drilling shaft 2 is added, the drilling shaft 2 added by the adapter is used as the section guide at the tip of the dancer hole hammer 3. 5 and the section guide piece 94 of the drill shaft add-on adapter 9 are drilled under the guidance of the steel sheet pile section PE, and the smooth lap drilling in which bending deformation of the drill shaft 2 can be suppressed is achieved. It becomes possible.

Further, as shown in FIG. 7, the sleeve shaft adapter has a guide flange f91 at its upper and lower ends, and is rotatable on a cylindrical sleeve guide 91 fixed on the rod piece 90. The section guide piece 94 attaches the right section guide piece 94a and the left section guide piece 94b to the holding piece 93P of the holder 93 in a detachable manner from both sides. Is preferred.
The sleeve guide 91 may be a half-cylinder of a two-part form welded and fixed on the rod piece 90, or an integral cylinder may be fitted and fixed on the rod piece 90, and the sleeve 92 is slidably rotated. It is only necessary that the sleeve 92 can be freely held and the vertical movement of the sleeve 92 can be regulated by the flange f91.

In this case, by adopting the right section guide piece 5a and the left section guide piece 5b in the section guide 5 of the dancer hole hammer 3, both the dancer hole hammer 3 and the joint (adapter 9) of the drilling shaft 2 can be used. Therefore, accurate position guidance with respect to the steel sheet pile section PE can be achieved, and the dancer hole hammer drilling shaft 2 can be used for the right and left of the steel sheet pile P under smooth guidance that does not cause deflection in the vertical direction. As described above, a predetermined lap drilling hole C2 row that is appropriately displaced can be formed, and a lap drilling hole C2 for continuous placement of steel sheet piles can be neatly formed by a small diameter drilling hole C2 that can be drilled with a small drilling power.
In addition, it is easy to attach and detach the section guide piece 94 that is severely worn, and the maintenance of the adapter 9, that is, the maintenance of the dancer hole hammer drilling shaft 2 can be rationalized.

Further, the drilling shaft adapter 9 has a flat plate-shaped holding piece 93P with a holder 93 vertically provided with a plurality of bolt holes h93 and a fixing piece 93C having an arcuate inner surface. The section guide pieces 94a and 94b are preferably fastened to the outer peripheral surface of the sleeve 92 and detachably bolted through the bolt holes h93 of the holding piece 93P.
In this case, since the holder fixing piece 93C has an arc inner surface, welding to the outer peripheral surface of the sleeve 92 or fixing with a bolt or the like can be reliably and easily performed.
The section guide pieces 94a and 94b are severely worn and need to be replaced. However, since the bolts are attached to and detached from the flat holding piece 93P, the attaching and detaching work is easy and the vertical position can be adjusted as necessary. It becomes.

  In the steel sheet pile continuous driving method of the present application, since the dancer hole hammer 3 is driven under the guide of the existing steel sheet pile P, it is preferable that the diameter of the hammer bit 6 and the protruding length of the section guide 5 are selected. Under the set drilling lap Cw, the hard rock formation GH can also form a continuous lap drilling C2 row with small diameter drilling holes that can be drilled with a small drilling power. Not only that, it is possible to perform continuous lap drilling with low power to the hard rock formation GH with a small leaderless dancer hole hammer drilling machine. Therefore, continuous placement of the steel sheet pile P into the continuous lap drilling row is also possible with vibration pile driving stress with low power, creation of a steel sheet pile continuous wall for mountain retaining on the hard rock formation GH, and Along the retaining wall Drilling waste soil, safety, and, can be carried out in the bottom of the epoch-making high-efficiency, it is possible to greatly reduce the construction cost.

  Moreover, since the vibration auger machine 1 is a working machine that exhibits a hole drilling action by rotation and a pile driving work by vibration in one unit, the hammer hole drilling shaft 2 for the output shaft 14b and the steel sheet pile gripping By simply attaching and detaching and replacing with the hydraulic chuck 10, it can be used as both a danza hole hammer drilling machine and a vibration pile driving machine, and a drilling machine and a vibration working machine (Vibro) in a conventional leaderless basic machine. As a result, it is possible to omit complicated and time-consuming work such as replacement, and the operating rate of the machine is improved.

  In addition, conventionally, when the steel sheet pile is continuously driven, the section PE at the lower end of the steel sheet pile is set to the upper end of the section PE of the ground protruding portion of the existing steel sheet pile P while the chuck 10 grips and suspends the upper end of the new steel sheet pile. However, in the present invention, the chuck 10 of the vibration auger machine suspends the newly installed steel sheet pile P, so that the chuck is difficult to align. By the fine adjustment rotation of 10, the work of engaging the newly installed steel sheet pile section PE in the suspended state and the existing steel sheet pile section PE becomes very easy, and the workability of the steel sheet pile driving is greatly improved.

  Moreover, when the cylindrical section guide 8 is used in combination with the steel sheet pile continuous driving method of the present application, the drill shaft 2 can be moved by the section guide 5 at the tip of the dancer hole hammer even when the dancer hole hammer 3 enters deep into the ground. And the guide by the cylindrical section guide 8 at the position of the ground GL, the guide hole is vertically moved, so that it is possible to appropriately control the posture of the dancer hole hammer drilling shaft 2 for vertical vibration drilling. The lapping hole C2 can be smoothly performed, and the wear of the members, particularly, the wear of the section guide 5 fixed to the dancer hole hammer can be suppressed.

  Moreover, since the vibration auger machine 1 used for the steel sheet pile continuous driving method of the present application is easy to attach and detach the drilling shaft 2 and the chuck 10 by a simple attachment / detachment mechanism, the vibration auger machine 1 is constructed using one vibration auger machine 1. Depending on the formation, the conventional auger screw is attached to the danza hole hammer 3 when the soft surface layer reaches the hard rock formation while drilling and drilling with a conventional earth auger screw if necessary. Drilling by attaching and detaching can be done either by drilling the hole C1 at the beginning of the drilling row and at the corner part with a conventional dancer hole hammer drilling machine, and then forming only the danza hole hammer when forming the continuous lapping hole C2. Can be used by simply attaching and detaching, and exchanging the drilling shaft 2 and the chuck 10 can be easily performed, so that the workability is good and the operation rate of the machine is good.

  Further, the sleeve 4 having the section guide 5 of the dancer hole hammer 3 can also be formed on the small diameter portion 32 of the case 31 so as to be flush with the outer periphery of the case, so that the drilling resistance of the sleeve 4 and the section guide 5 is suppressed. The continuous lapping hole C2 can be smoothly drilled under the engagement sliding by the steel sheet pile section PE of the section guide 5.

  Moreover, since the section guide piece 80 exists on the fixed plate 81 having a flat plate shape, the cylindrical section guide 8 used in the steel sheet pile continuous driving method of the present application has a work of disengaging the section guide piece 80 from the steel sheet pile section PE. It is easy to press and fix the projecting portion 80e of the central partition plate 80w by the screw bolt and the steel sheet pile section PE to prevent the cylindrical section guide 8 from moving up and down blindly. In addition, since it opens and closes at a wide angle with both side ends of the fixed plate 81 as the rotation center, and is a locking means by inserting and removing the pin P8, the inner diameter D8 of the cylindrical section guide 8 has a drilling shaft 2 such as an auger screw. In spite of the approximate diameter of the outer diameter, the loose fitting to the drilling shaft 2 on the ground GL and the opening / removing operation are simple and easy.

  In addition, the adapter 9 for drilling shaft addition employed in the steel sheet pile continuous driving method of the present application has a female joint portion Jf at the lower end and a male joint portion Jm at the upper end connected to the upper and lower ends of the conventional drilling shaft 2. By making pin joints with each joint portion, the drilling shaft 2 can be added easily and easily. When the drilling shaft 2 is added, the section guide piece 94 is engaged with the steel sheet pile section PE. The drilling shaft 2 added by the adapter is a drilling operation under the guidance of the steel sheet pile section PE by the section guide 5 at the tip of the dancer hole and the section guide piece 94 of the drilling shaft extension adapter 9. As a result, smooth lapping can be achieved in which bending deformation of the drilling shaft can be suppressed.

[Vibrating auger machine (Fig. 4)]
4A is an overall front view of the vibration auger machine 1, and FIG. 4B is an exploded front view.
As shown in FIG. 4 (A), the vibration auger machine 1 protects a motor with a reduction gear directly connected to a first reduction gear 11a, a second reduction gear 11b, and a basic bearing 11c at a lower portion of a hydraulic motor M11 with a case 1C. The auger body 11 and the swivel part 14 are fixed with a vibrating part 13 interposed therebetween. As shown in FIG. 2A, the upper part of the auger body 11 is attached to the basic machine (leaderless auger machine) with a mounting pin P1. 3), and as shown in FIG. 3, the output shaft 14b at the lower end of the swivel portion 14 can be exchangeably connected to the output shaft 14b by the attachment / detachment mechanism portion P14 with the punch shaft 2 for gripping the steel sheet pile. .

As shown in FIG. 4B, the structure of the vibration auger machine 1 is such that the spline output shaft 11d at the lower end of the auger body 11 composed of a motor with a reduction gear (commercially available) is output from the built-in conical roller bearing on the upper surface of the strong bearing 12. The bearing 12a is fitted, and the mounting portion B11 on the outer periphery of the lower surface of the auger body 11 and the mounting portion B12 on the outer periphery of the upper surface of the strong bearing 12 are fixed at 12 locations on the circumference by B bolts and B nuts.
The vibrating portion 13 is a vibrator that generates an up-and-down vibration by rotating an eccentric body facing each other through a tuning gear, and has an upper mounting portion C13 on the vibrating portion 13 and an outer periphery on the upper surface of the strong bearing 12. The bolts and nuts are fastened to the mounting portions C12 at the four corners.

In addition, at the lower part of the vibration part 13, the L-shaped bracket is fastened with bolts and nuts at the mounting part D13, and the L-type bracket is fastened with bolts and nuts at the lower mounting parts D12 of the strong bearing 12 (four lower parts of the strong bearing). Thus, the vibrating portion 13 is disposed on the outer periphery of the strong bearing 12.
Further, the output shaft 12 b at the lower end of the strong bearing 12 and the output bearing 14 a of the swivel portion 14 are connected by a bolt nut E.
Further, the auger case 1C and the auger main body 11 are attached by fastening the attachment portion A1 and the attachment portion A11 with bolts and nuts.
As described above, the vibration auger machine 1 shown in FIG. 4A is obtained by suitably incorporating the strong bearing 12 and the vibration part 13.

[Danza Hall Hammer (Figs. 5 and 6)]
The dancer hole hammer 3 (FIG. 5) of the present invention is provided with a general commercially available dancer hole main body 30 and an outer case (danzer hole) 31, and has a hammer bit 6 at the lower portion, High-pressure air that has passed through the swivel part of the auger is supplied from the upper male joint part Jm through the auger screw, and drives the cylinder (not shown) in the dancer hole body 30 to move the hammer bit 6 up and down. It occurs and crushes rocks, and its internal structure and impact crushing action are the same as those of the conventional dancer hole hammer 3 ′ shown in FIG.

That is, the dancer hole hammer 3 of the present invention is different from the conventional dancer hole hammer 3 ′ in that the sleeve 4 provided with the section guide 5 is disposed on the case 31.
As shown in FIG. 6A, as the case 31, a commercially available steel pipe having an outer diameter of 508 mm and a thickness of 16 mm is cut to a desired length to prepare a case upper part 31u and a case lower part 31d, and separately prepared outer diameters 355. A steel pipe for the case small diameter portion 32 having a thickness of 6 mm and a thickness of 15 mm is welded and joined, and the case upper portion 31u (standard length: 1500 mm), the small diameter portion 32 (standard length: 500 mm), and the case lower portion 31d (standard length: 300 mm). ) Is prepared.

  Further, as shown in FIG. 6B, sleeve guides 41a and 41b in a semi-cylindrical shape having a wall thickness of 20 mm and a cast cylinder provided with a flange f41 on the upper and lower sides are fitted into the small diameter portion 32 of the case, and the sleeve guides are fitted. 41a and 41b, and the connection line between the flange f41 and the case upper part 31u and the case lower part 31d are weld lines Lm, and the outer periphery of the flange f41 is flush with the case upper part 31u and the case lower part 31d. It welds and integrates on the part 32 with the welding line Lm.

Next, as shown in FIG. 6 (C), the inner sleeves 42a and 42b having a wall thickness of 26 mm in which a rectangular flat fitting convex part a42 is arranged on the outer peripheral surface in a two-divided cylindrical form are placed on the sleeve guide 41. The inner sleeve 42 is disposed so as to be slidably rotatable and integrated with a weld line Lm in a form in which the vertical movement is restricted by the flange f41.
Next, an outer sleeve 43a and 43b of a cylindrical two-part form having a thickness of 28 mm and a fitting recess b43 corresponding to the fitting projection a42 of the inner sleeve 42 on the inner surface are fitted on the inner sleeve 42. The concave portion b43 is fitted into the fitting convex portion a42 and is bolted through the bolt hole h43 and the bolt hole h42.

As shown in FIG. 6 (A), one of the outer sleeves 43a and 43b has a holder 44 including a fixed piece 44C having an arc inner surface and a flat plate-shaped holding piece 44P in which bolt holes h44 are vertically arranged. As shown in FIG. 6 (C), welding is fixed by a welding line Lm.
Next, the case 31 in which the sleeve 4 is arranged on the case small-diameter portion 32 so as to be rotatable and cannot be moved up and down is replaced with a case of a conventional (commercially available) dancer hole hammer (FIG. 11C). At P3, it is fixed to the dancer hole main body 30 to form the present invention dancer hole hammer.

6C, a right section guide piece 5a and a left section guide piece 5b each having an engagement groove 5G and a bolt hole h5 are prepared. When the dancer hole hammer 3 is used, the sleeve 4 The section guide pieces 5a and 5b are bolted to the upper holder 44.
The holder 44 may be fixed to the sleeve 4 by bolting the fixing piece 44C to the surface of the outer sleeve 43 in place of the welding integration shown in FIG. Since the section guide pieces 5a and 5b are fastened in use, the maintenance and management of the dancer hole hammer 3 can be rationalized.

[Cylindrical section guide (Fig. 8)]
As shown in FIG. 1B, the cylindrical section guide 8 is placed on the ground GL to guide the drilling shaft 2 at the ground position during the drilling operation of the dancer hole hammer drilling shaft 2. As shown in FIG. 8A, the inner diameter D8 of the cylinder is slightly larger (standard: 10 mm) than the outer diameter D2 (FIG. 1) of the drilling shaft 2.
8 (A) is a plan view of a fitting and closing configuration of the cylindrical section guide 8, FIG. 8 (B) is an exploded plan view, FIG. 8 (C) is an open state plan view, and FIG. D) is an exploded perspective view of the cylindrical ring body 82. FIG.
As shown in FIG. 8 (B), the cylindrical section guide 8 has a semi-cylindrical shape on both sides, which is rotatably pinned by connecting pins P8 to both side ends of a flat plate-shaped fixing plate 81 provided with a section guide piece 80. The cylindrical ring body 82 (outer ring body) and a semi-cylindrical inner ring body 83 disposed on the inner peripheral portion of each outer ring body 82.

  As shown in FIG. 8 (D), each cylindrical ring body 82 has a cylindrical piece tu2 at the inner end fixed to the fixed plate 81 at the upper and lower sides with an interval St, and the outer end is one cylindrical ring. The body 82 is provided with a cylindrical piece tu3 up and down with a spacing St, and the other cylindrical ring body 82 is provided with a cylindrical piece tu4 with a height Lt that can be fitted in the spacing St at the center, and from the upper end edge, a bolt hole h82. The tongue piece 82a having a structure protruding outwardly has a height of about 40 cm, and the inner diameter D8 in the state of being closed in a cylindrical shape is a danza having a diameter of 584 mm even when the inner ring body 83 having a thickness of 16 mm is closely arranged. In order to loosely fit the hole hammer auger screw diameter of 550 mm, the hole hammer is 560 mm (D8).

The fixed plate 81 is a steel plate having a wall thickness of 10 mm, a width of 100 mm, and a height equal to that of the cylindrical ring body (40 cm), and at the center of both side edges, the interval between the inner end cylindrical pieces tu2 of the cylindrical ring body 82 is provided. A cylindrical piece tu1 having a height Lt to be fitted into St is disposed.
As shown in FIG. 8B, the section guide piece 80 has a partition plate 80w projecting forward at the center and engaging grooves 8G on both sides, and the partition plate 80w projects vertically from the cylindrical ring body 82. The part 80e is integrally cast in a form protruding 30 mm, a bolt hole h80 is provided in the protruding part 80e of the partition plate 80w, and welding is integrated with the outer surface of the fixed plate 81.
Then, the cylindrical pieces tu1 at the center of both side edges of the fixed plate 81 and the cylindrical pieces tu2 above and below the inner end of each cylindrical ring body 82 are inserted and locked with a connecting pin P8, and can be opened and closed around the fixed plate 81. A cylindrical ring body 82 is formed.

Further, the inner ring body 83 protects the inner peripheral surface of the cylindrical ring body 82 from being worn, and also replaces the change in the outer diameter of the drilling shaft 2 to provide an expensive cylinder having a section guide piece 80. It is a replaceable two-divided cylindrical piece for imparting durability and versatility to the ring body 82, as shown in FIG. A tongue piece 83a provided with a bolt hole h83 is protruded and the tongue piece 83a is detachably bolted to the tongue piece 82a of the cylindrical ring body 82.
Then, several types of inner ring bodies 83 having different radii of curvature are prepared for a kind of cylindrical ring body 82, and the inner ring bodies 83 are replaced with different inner diameter sizes corresponding to changes in the outer diameter of the drilling shaft 2. The auger screw 2 is made of a mild steel pipe that does not wear because it is replaced by wear of the inner peripheral surface.

  Therefore, if the cylindrical section guide 8 provided with the inner ring body 83 on the inner peripheral portion of the cylindrical ring body 82 as shown in FIG. 8C is closed annularly as shown in FIG. The connecting pin P8 can be inserted and locked into the cylindrical pieces tu3 and tu4 at the outer end, and the section guide piece 80 is engaged with the steel sheet pile section PE even during the operation of the dancer hole hammer drilling shaft 2, and the cylindrical ring body 82 is fitted and closed to the outer periphery of the drilling shaft 2 at the position of the ground GL, and the bolt S is screwed into and contacted with the steel sheet pile section PE from the bolt hole h80 of the partition plate protrusion 80e, whereby the cylindrical section guide 8 is brought into contact with the ground GL. It is possible to perform the guide function of the drilling shaft 2 without moving up and down blindly at the position.

[Adapter for drilling shaft (Fig. 7)]
7A is an exploded perspective view of the adapter 9 for drilling shaft, FIG. 7B is an assembled perspective view, and FIG. 7C is a completed perspective view of the adapter.
As is clear from FIG. 7C, the rod piece 90 of the adapter 9 of the present invention has a male joint portion Jm at the upper end of the rod piece 90 and a female joint at the lower end, similarly to a conventional drilling shaft adapter (not shown). A joint joint having a portion Jf, and half sleeve guides 91a and 91b each having a flange f91 on the upper and lower sides thereof are fitted on the outer periphery of the rod piece 90 and welded and integrated with the rod piece 90. As shown in FIG. 7 (B), the half sleeves 92a and 92b are fitted, and the sleeves 92a and 92b can be slidably rotated on the sleeve guide 91 along the weld line Lm. A sleeve 92 that is formed of a sleeve 92 that cannot move up and down at f91, has a circular arc inner surface, and a plate-like holding piece 93P in which a bolt hole h93 is provided vertically is provided. , Welded to the sleeve 92, or fixed by a screw.

Further, as shown in FIG. 7B, a right section guide piece 94a and a left section guide piece 94b having an engagement groove 94G and a bolt hole h94 are prepared, and both section guides are used when the adapter 9 is used. The pieces 94 a and 94 b are bolted to the holder 93.
In this case, in the state where the engagement grooves 94G of the section guide pieces 94a and 94b fixed to the holder 93 are engaged with the steel sheet pile section PE, the outer side of the dancer hole hammer is prevented from contacting the steel sheet pile section PE. Determine the side projection dimension.

  Further, the height of the holder 93 is formed to be about twice the height of the fixed piece 93C. Under the condition that the length of the rod piece 90 is suppressed, the sleeve guide 91 and the sleeve 92 are arranged, and The section guide pieces 94a and 94b having a sufficient length for smooth guidance can be employed in the engaging groove 94G, which is advantageous as the adapter 9 in the middle of the drilling shaft 2 which is easy to bend.

[Construction (Fig. 1, Fig. 10)]
The steel sheet pile continuous placing method for the hard rock formation GH is carried out by a leaderless basic machine equipped with the vibration auger machine 1 as a working machine as shown in FIG.
As shown in FIG. 2 (A), the first single hole C1 is formed by replacing a conventional auger screw head with a conventional and large diameter danza hole hammer 3 '. Is pin-connected to the output shaft 14b of the vibration auger machine 1 by the attaching / detaching mechanism portion P14, and is formed to a predetermined depth by a conventional dancer hole hammer drilling.

  Next, the drilling shaft 2 is pulled up, and a hydraulic chuck 10 for gripping a steel sheet pile is connected to the output shaft 14b of the vibration auger machine 1 in place of the drilling shaft 2 by an attaching / detaching mechanism P14. The driven steel sheet pile P is suspended, and the steel sheet pile P is shifted in the drilling hole C1 and rearward in the construction progress direction F as shown in FIG. Then, positioning is performed at a predetermined steel sheet pile meshing center line OO, and the upper end of the steel sheet pile is driven into a state slightly protruding from the ground GL.

  Next, as shown in FIG. 2 (B), the conventional dancer hole hammer 3 having the section guide 5 is connected to a conventional joint through an adapter 7 having a male joint portion Jm at the upper end and a female joint portion Jf at the lower end. A danza hole hammer drilling shaft 2 replaced with a screw head of a small-diameter auger screw is attached to the output shaft 14b of the vibration auger machine 1 with a chuck 10, and the section PE of the existing steel sheet pile P as shown in FIG. As shown in FIG. 10, the section guide 5 of the danza hole hammer 3 is engaged with the oscillating auger machine 1 by the leaderless basic machine by the slow rotation action on the output shaft 14 b and the crushing action of the danza hole hammer 3. The hole wrap Cw is secured to form the lap hole C2 for the existing hole C1.

FIG. 9 is an explanatory diagram of the relationship between the dancer hole hammer 3 and the steel sheet pile P. As shown in FIG. 9C, the section guide 5 includes a right section guide piece 5a and a left section guide piece 5b. If the flat plate portion PF of the driven steel sheet pile (existing steel sheet pile) protrudes to the left side, that is, the left steel sheet pile, the next steel sheet pile protrudes to the right side, so the right section guide piece 5a is made of steel. Engage and guide the sheet pile section PE.
The lap drilling hole C2 following the single drilling hole C1 is formed as shown in FIG. 10 in which the existing steel sheet pile is driven in the corresponding drilling hole while being shifted rearward in the construction progress direction F. Since the section PE for engaging 5 is also a deep position in the drilling hole C1, the section guide 5 serves as a guide in the existing drilling hole C1, and the section guide is used for drilling while maintaining a sufficient drilling lap Cw. Drilling resistance due to protruding 5 can be suppressed.

As shown in FIG. 1 (B), when the dancer hole hammer 3 at the tip of the drilling shaft 2 enters the ground, the cylindrical section guide 8 shown in FIG. 8 and the engaging groove 8G of the section guide piece 80 are made of steel. Engage with the sheet pile section PE and loosely fit on the outer periphery of the drilling shaft 2, insert the pin P8 into the cylindrical pieces tu3 and tu4 at both ends of the cylindrical ring body 82, and close the ring, and the protruding portion of the partition plate 80w The screw bolt S is screwed and pressed into the steel sheet pile section PE through the bolt hole h80 of 80e (FIG. 8D), and the cylindrical section guide 8 is fixed to the existing steel sheet pile P at the ground GL position.
The lap drilling hole C2 forming action by arranging the cylindrical section guide 8 is that the drilling shaft 2 serves as a guide between the section guide 5 of the tip dancer hole hammer 3 and the cylindrical section guide 8 at the ground position. The impact drilling work in the hard rock formation GH can be carried out smoothly with reduced lateral shaking.

As shown in FIG. 1 (C), when the drilling shaft 2 enters deeply into the ground and the drilling shaft 2 is added, the cylindrical section guide 8 is removed and the drilling shaft adapter 9 shown in FIG. Add shaft 2.
As shown in FIG. 7C, the adapter 9 also includes right and left section guide pieces 94a and 94b, so that the section guide pieces 94a and 94b are selectively used in the same manner as the section guide 5 of the dancer hole hammer 3. Engaging with the section PE of the existing steel sheet pile P, the adapter 9 is connected to the underground drill shaft 2 and the additional drill shaft 2 by the upper male joint portion Jm and the lower female joint portion Jf. Continue to close the lap drilling operation again.
As shown in FIG. 1 (D), when the adapter 9 also enters deep into the ground, the cylindrical section guide 8 is rearranged again as necessary to form the lapping hole C2.

When the lap hole C2 having a predetermined depth can be formed by the progress of the hole drilling in FIG. 1 (D), the hole shaft 2 is pulled up, the hole shaft 2 is detached from the output shaft 14b of the vibration auger machine 1, and the hydraulic chuck 10 As shown in FIG. 3C, the male joint portion Jm at the upper end is fitted into the female joint portion Jf of the output shaft 14b and is pin-connected by the attaching / detaching mechanism portion P14.
Next, as shown in FIG. 3D, the new steel sheet pile P to be driven into the lapping hole C2 is suspended by the chuck 10, and the chuck 10, that is, the output shaft 14b is adjusted and rotated while the new steel sheet pile P is adjusted. The lower end of the section PE is engaged with the upper end of the section PE protruding from the ground GL of the existing steel sheet pile P, and the new steel sheet pile P is installed in the single hole C1 as shown in FIG. The steel sheet pile is placed in a continuous form.
As described above, as shown in FIG. 10 (A), the formation of the lapping hole C2 of the dancer hole hammer 3 continuously linearly in the first single hole C1 and the vibration driving of the steel sheet pile P into the lapping hole C2 are as follows. Repeatedly.

  As shown in FIG. 10B, at the corner portion, after the lowest straight portion lap hole C2 is formed, a large-diameter corner single hole C1 is formed in a conventional dancer prior to driving the steel sheet pile into the lap hole C2. A new steel sheet pile P is formed in a form in which a hole is formed by a hole hammer 3 ', a steel sheet pile P is driven into the previously drilled hole C2, and then the existing steel sheet pile P is turned at a corner angle (standard: 90 °). Is inserted into the corner hole drilling hole C1, and thereafter, the lap hole drilling C2 and the steel sheet pile driving are repeatedly performed on the basis of the corner steel sheet pile P.

As shown in FIGS. 10 (A) and 10 (B), the continuous lap drilling row has a steel sheet pile P as viewed in the construction progress direction F, and a steel sheet pile P projecting hole C2 protruding from the flat plate portion PF on the right side. In formation, the section guide 5 of the danza hole hammer 3 engages the section guide piece 5a for the right with the section PE of the already driven steel sheet pile, and the hammer bit center point Oc (drilling center point) is the steel sheet pile. In the steel sheet pile hole C2 that is shifted to the right of d1 from the meshing center line OO and protrudes to the left in the traveling direction F, the engagement of the left section guide piece 5b to the steel sheet pile section PE is The hammer bit center point Oc is drilled by shifting d1 to the left from the steel sheet pile meshing center line OO.
Of course, the right and left selective application of the section guide piece 80 of the cylindrical section guide 8 and the section guide piece 94 of the adapter 9 for drilling shaft is aligned with the section guide 5 of the dancer hole hammer.

  In this case, as shown in FIGS. 9A and 9C, the outer periphery of the hammer bit 6 does not come into contact with the steel sheet pile section PE, and the section guide 5 is drilled in such a dimensional form as to descend in the already drilled hole. Therefore, since the hole wrap Cw can be formed in the holes C1 and C2, and each hole C2 is displaced in the protruding direction of the flat plate portion PF of the steel sheet pile, it is possible to form a relatively small diameter hole C2 row. Even if it exists, each steel sheet pile P will be able to drive completely continuously in the drilling hole C2 row | line | column, and the steel sheet pile continuous driving | running | working by the small diameter drilling hole C2 row | line with little drilling energy consumption can be achieved.

  Therefore, as shown in FIGS. 10A and 10B, the first drilling hole C1 and the corner portion are defined by using a conventional dancer hole hammer that defines the reference positions of the drilling holes C1 and C2 and performs independent drilling. The drilling power can be rationalized by increasing the diameter of the drilling hole C1 and implementing the continuous lap drilling hole C2 by the dancer hole hammer 3 provided with the section guide 5 with the necessary minimum diameter.

Further, during lap drilling work with a danza hole hammer equipped with a section guide 5, guide control of the drilling shaft 2 by the cylindrical section guide 8 at the ground GL position and section guide at the drilling shaft 2 additional position. The guide control of the drilling shaft 2 by the attached adapter 9 can suppress the occurrence of bending of the long drilling shaft 2, so that the vibration drilling operation of the dancer hole hammer 3 can be guided smoothly and the drilling shaft 2 is also smooth. Thus, it is possible to guide the drilling hole and to suppress wear due to the lateral deflection of the drilling shaft 2.
If the reduction and rationalization of the drilling power consumption is ignored, the first drilling hole C1 and the continuous lapping hole C2 can be implemented with the same drilling diameter.

5 and 6 has a structure in which the sleeve 4 is bolted to the outer sleeve 43 on the inner sleeve 42, so that the holder 44 is mounted on the outer sleeve 43a or 43b. If the outer sleeve 43a is replaced with an outer sleeve 43b without a holder, the section guide 5 can be removed as shown in FIG.
Therefore, in the present embodiment, the dancer hole hammer 3 of the present embodiment can be replaced with an ordinary sleeve drilling hole hammer 3 'for lap drilling that cannot be lap drilled by replacing the outer sleeve. In addition, it is possible to use them freely, which can rationalize machine equipment costs and rationalize maintenance.

[Others]
In the cylindrical section guide 8 shown in FIG. 8, the tongue piece 82 a and the tongue piece 83 a of the cylindrical ring body 82 and the inner ring body 83 can be provided at the upper edge portion and the lower edge portion. Instead of the bolt hole h80 of the projecting portion 80e, a bolt hole (not shown) is made in the side surface of the section guide piece 80, and the bolt S is screwed into the steel sheet pile section PE from the outer surface of the section guide piece 80. But the initial goal can be achieved.
Moreover, if the bolt fixing means of the section guide piece 80 and the steel sheet pile section PE is fixed at two points above and below the section guide piece 80, the cylindrical section guide 8 is more reliably held.

It is construction explanatory drawing of this invention, (A) is a lap drilling start state, (B) is a cylindrical section guide arrangement state, (C) is an adapter mounting state with a section guide, (D) is drilling It is a figure which shows the state which the axis | shaft 2 reached | attained to the predetermined depth. It is explanatory drawing of a dancer hole hammer drilling machine, Comprising: (A) shows the state which mounted | worn the conventional dancer hole hammer, (B) shows the dancer hole hammer of this invention provided with the section guide 5 for replacement | exchange. FIG. It is use explanatory drawing of this invention vibration auger machine, (A) is the attachment / detachment state of a drilling shaft, (B) is the connection state to the output shaft of a drilling shaft, (C) is the attachment / detachment state of a chuck | zipper. (D) is a figure which shows the state which connected the chuck | zipper. It is structure explanatory drawing of this invention vibration auger machine, Comprising: (A) is a whole front view, (B) is an assembly explanatory drawing. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a dancer hole hammer according to the present invention, where (A) shows an assembled state, (B) shows an exploded state, and (C) shows a assembled dancer hole hammer with a section guide removed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a dancer hole hammer according to the present invention, in which (A) is an exploded perspective view, (B) is a perspective view in which only a sleeve guide is assembled, and (C) is a perspective view in which an inner sleeve is assembled on the outer periphery of the sleeve guide. . It is explanatory drawing of this invention adapter with a section guide, (A) is a disassembled perspective view, (B) is a perspective view before fixation of a section guide piece, (C) is an assembly completion perspective view. It is a cylindrical section guide explanatory drawing of the present invention, (A) is a plan view of the closed state, (B) is a plan view of the exploded state, (C) is a plan view of the joined state of the cylindrical ring and the inner ring, (D) is It is a cylindrical ring body disassembled perspective view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of the present invention dancer hole hammer, wherein (A) is a side view of an engaged state with a steel sheet pile section, (B) is a cross-sectional view taken along the line BB of (A), FIG. It is a steel sheet pile driving | operation explanatory drawing in this invention drilling row | line | column, Comprising: (A) is a linear part, (B) is a figure which shows a corner part. It is explanatory drawing of the prior art example, Comprising: (A) is a construction process explanatory front view, (B) is a top view, (C) is a conventional dancer hole hammer side view. It is explanatory drawing of the prior art example 2, Comprising: (A) is a schematic side view, (B) is a partial enlarged top view.

Explanation of symbols

1 Vibration auger machine (vibration auger)
2 Drilling shaft (danza hole hammer drilling shaft)
3,3 'Danza Hall Hammer 4 Sleeve 5 Section Guide 5a Right section guide piece (section guide piece)
5b Section guide piece for left (section guide piece)
5G, 8G, 94G Engagement groove 6 Hammer bit 7 Adapter 8 Cylindrical section guide 9 Adapter with section guide (adapter, fitting)
10 Chuck (hydraulic chuck)
11 Auger body (motor with reduction gear, hydraulic auger)
11a First reduction gear (reduction gear)
11b Second reduction gear (reduction gear)
11c Basic bearing 11d Spline output shaft (output shaft)
12 Strong bearing (bearing)
12a Output bearing (bearing)
12b Output shaft 13 Vibrating part (Vibro)
14 Swivel part 14a Output bearing 14b Output shaft (vibrating auger output shaft)
30 Danza Hall body (Danza Hall hammer body)
31 Case 31u Case upper part 31d Case lower part 32 Small diameter part (Case small diameter part)
41, 41a, 41b, 91, 91a, 91b Sleeve guide 42, 42a, 42b Inner sleeve 43, 43a, 43b Outer sleeve 44, 93 Holder 44C, 93C Fixed piece 44P, 93P Holding piece 80 Section guide piece 80e Protruding part 80w Partition Plate 81 Fixed plate 82 Cylindrical ring (outer ring)
82a, 83a tongue piece 83 inner ring body 90 rod piece 91, 91a, 91b sleeve guide 92, 92a, 92b sleeve 94, 94a, 94b section guide piece a42 fitting convex part (fitting part)
A1, A11, B11, B12, C12, C13, D12, D13 Mounting part a42 Fitting convex part (fitting part)
b43 Fitting recess (fitting part)

GH Hard rock formation GL Ground Jm Male joint part (joint part)
Jf Female joint part (joint part)
Lm Welding line (welding)
hj Joint pin hole f41, f91 Flange h5, h42, h43, h44, h80, h82, h83, h93, h94 Bolt hole C1 First hole (corner hole, hole)
C2 Continuous lapping (intermediate drilling, drilling)
Cw Drilling wrap JP2, JP3 Mounting pin M11, M13 Drive motor (hydraulic motor, motor)
P Steel sheet pile PE section PF Flat plate part PG Engaging groove PS Inclined plate part P1, P3 Mounting pin P8 Connecting pin P14 Detachment mechanism part (Mounting pin part)
S Screw bolt (bolt)
tu1, tu2, tu3, tu4 cylindrical piece

Claims (17)

  A single drilling hole (C1) is formed by a vibration auger machine (1) connected to a drilling shaft (2) equipped with a conventional dancer hole hammer (3 '), and then a chuck (10) for gripping a steel sheet pile is provided. A drilling shaft (2) provided with a danza hole hammer (3) having a section guide (5) by vibrating the steel sheet pile (P) into the drilling hole (C1) by means of the connected vibration auger machine (1). The section guide (5) of the dancer hole hammer (3) is engaged with the section (PE) of the existing steel sheet pile (P) by the vibration auger machine (1) connected to the steel sheet pile. A continuous lap drilling hole (C2) having a drilling lap (Cw) in the drilled hole (C1) is formed under a guide in the section (PE) to a predetermined depth, and a drilling shaft ( 2) After removing the lift, remove the chuck (10). With the continued vibration auger machine (1), the section (PE) of the new steel sheet pile (P) is engaged with the section (PE) of the existing steel sheet pile (P) and driven into the continuous lapping hole (C2). Steel sheet pile continuous driving method to hard rock formation.   When the dancer hole hammer (3) having the section guide (5) is buried in the ground, the cylindrical section guide (8) is loosely fitted on the outer periphery of the drilling shaft (2) and mounted on the ground (GL). And is fixed to the existing steel sheet pile (P), and the drill shaft (2) is guided and drilled by the section guide (5) of the dancer hole hammer (3) and the cylindrical section guide (8). Item 1. Steel sheet pile driving method.   The cylindrical section guide (8) is a two-part open / close cylindrical ring body (82) having a section guide piece (80), and engages the section guide piece (80) with a section (PE) of an existing steel sheet pile. In addition, the section guide piece (80) is fixedly attached to the steel sheet pile section (PE) while being loosely fitted and closed on the outer periphery of the hole shaft (2) and placed on the ground, thereby guiding the hole shaft (2). The steel sheet pile continuous driving method according to claim 2.   When the next drilling shaft (2) is added to the drilling shaft (2) that has entered the soil, the section guide piece (94) is attached to the existing steel using the adapter (9) with the section guide piece (94). The steel sheet pile continuous placing method according to any one of claims 1 to 3, wherein the drill shaft (2) is connected to each other by engaging with a section (PE) of the sheet pile (P).   The section guide (5) of the dancer hole hammer (3) is provided with a right section guide piece (5a) and a left section guide piece (5b), to the steel sheet pile section (PE) of the right section guide piece (5a). At the time of engagement, the center point (Oc) of the danza hole hammer is shifted to the right by the distance (d1) from the steel sheet pile engagement center line (OO), and the left section guide piece (5b) to the steel sheet pile section (PE) is moved. The steel sheet pile according to any one of claims 1 to 4, wherein at the time of engagement, the center point (Oc) of the danza hole hammer is drilled by shifting a distance (d1) from the steel sheet pile engagement center line (OO) to the left side. Continuous placement method.   The steel sheet piles (P) are driven into the corresponding drilling holes (C1, C2) while being shifted rearward in the traveling direction (F) with respect to the corresponding drilling holes (C1, C2). The steel sheet pile continuous placing method of any one of these.   The first drilling hole (C1) and the corner drilling hole (C1) are a drilling machine (1) equipped with a conventional dancer hole hammer (3 ′) and have a larger diameter than the intermediate drilling hole (C2). The steel sheet pile continuous placing method according to any one of claims 1 to 6, wherein a hole is formed. The output shaft (14b) of the vibration auger machine (1) having the vibration part (13) interposed between the auger body (11) and the swivel part (14) is connected via the attachment / detachment mechanism part (P14). Danza hole hammer drilling shaft (2), and a steel sheet pile gripping chuck (10) and replaceable mounted, a drive motor for the auger body (11) (M11), the vibrating section (13) a drive motor (M13) As a separate drive system, use as a drilling machine when connecting the output shaft (14b) to the output shaft (14b) as a drilling machine and a chuck for gripping a steel sheet pile on the output shaft (14b) A drilling pile driver for continuously placing steel sheet piles, comprising a vibration auger machine (1) that enables use as a vibration pile driver when (10) is connected .
A dancer hole hammer (3) attached to the tip of a drilling shaft (2) having a joint portion (Jm) at the upper end and a hammer bit (6) at the lower end, and a case (31) on the outer periphery of the dancer hole body (30) ), And the sleeve (4) is arranged on the outer periphery of the small diameter portion (32) so that it cannot move up and down and is slidably rotatable, and does not protrude from the outer periphery of the case (31) . Danza hole hammer for continuous lap drilling used for steel sheet pile continuous driving method to hard rock formation, with section guide (5) for engaging and sliding with steel sheet pile section (PE) fixed to sleeve (4) .
  A sleeve guide (41) having a flange (f41) at the top and bottom is fitted and fixed to the small diameter portion (32) of the case, and an inner sleeve (42) is loosely fitted between the top and bottom flanges (f41) of the sleeve guide (41). 10. The dancer hole hammer according to claim 9, wherein a two-part outer sleeve (43a, 43b) having a semicircular cross section is detachably fitted on the inner sleeve (42).   The inner sleeve (42) is provided with a fitting portion (a42) at an appropriate position on the outer peripheral surface, and the split outer sleeve (43a, 43b) is provided on the inner peripheral surface with a fitting portion (b43 corresponding to the inner sleeve fitting portion (a42)). ), And the outer sleeves (43a, 43b) are fitted into the inner sleeves (42) in a state where the fitting portions (b43) of the divided outer sleeves (43a, 43b) are fitted to the fitting portions (a42) of the inner sleeves. 11) The danza hole hammer according to claim 10, wherein the bolt is fastened to the bolt.   The section guide (5) is configured such that a right section guide piece (5a) and a left section guide piece (5b) are detachably fixed to a holding piece (44P) in a flat plate shape of a holder (44) from both sides, The dancer hole hammer according to any one of claims 9 to 11, wherein a fixed piece (44C) having an arc inner surface of (44) is fixed to the outer periphery of the sleeve (4).   On the outer surface of the flat plate-shaped fixing plate (81) provided with cylindrical pieces (tu1) on both side ends, a central partition plate (80w) and section guide pieces (80) on both sides are provided, and the partition plate (80w) is a bolt. Two cylindrical rings (82) in a semicircular shape, which are arranged in a form having a protrusion (80e) having a hole (h80) and are provided with cylindrical pieces (tu2, tu3, tu4) on both side ends, The cylindrical piece (tu2) at the inner end is connected to the cylindrical piece (tu1) at the end on the fixed plate (81) side and the pin (P8), and the cylindrical pieces (tu3, tu4) at the outer ends of both cylindrical rings (82) are connected to each other. Each cylindrical ring body (82) is used in a steel sheet pile continuous placing method on a hard rock formation that can be pin-locked with a pin (P8) with the outer periphery of the drill shaft (2) loosely fitted in a cylindrical shape. Cylindrical section guide.   The cylindrical ring body (82) has a tongue piece (82a) that protrudes horizontally and has a bolt hole (h82) at an appropriate position at the upper and lower ends, has a smaller radius of curvature than the cylindrical ring body (82), and has an appropriate position at the upper and lower end positions. A two-part inner ring body (83) provided with a tongue piece (83a) that protrudes horizontally and has a bolt hole (h83) is formed on the inner surface of the cylindrical ring body (82), with the tongue piece (83a) and the tongue piece (82a). The cylindrical section guide according to claim 13, which is fastened by bolting with a bolt.   Turn the sleeve (92) around the outer periphery of the rod piece (90) with the joint pin hole (hj) and female joint part (Jf) at the lower end and the joint pin hole (hj) and male joint part (Jm) at the upper end. Steel for hard rock formations, which is movable and cannot be moved up and down, the holder (93) is fixed on the sleeve (92), and the section guide piece (94) is detachably attached to the holder (93). Drilling shaft adapter used in the sheet pile continuous driving method.   The sleeve (92) has a guide flange (f91) at the upper end and the lower end, and is rotatable on a cylindrical sleeve guide (91) fixed on the rod piece (90), and the flange (f91). The section guide piece (94) can be attached and detached from both sides of the right section guide piece (94a) and the left section guide piece (94b) to the holding piece (93P) of the holder (93). The adapter for a drilling shaft according to claim 15, which is fixed to the drilling shaft.   The holder (93) has a flat plate-like holding piece (93P) having a plurality of bolt holes (h93) vertically arranged thereon and a fixing piece (93C) having an arc inner surface, and the fixing piece (93C) is The drilling shaft according to claim 15 or 16, wherein the section guide piece (94a, 94b) is fixed to the outer peripheral surface of the sleeve (92), and the section guide piece (94a, 94b) is detachably bolted through the bolt hole (h93) of the holding piece (93P). Adapter.

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