JP3862270B2 - Steel sheet pile continuous placing method to hard rock formation and instrument 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 capable of continuously placing steel sheet piles by continuously lapping with a danza hole hammer drilling in the formation, and a tool (device) used in the construction method. It belongs to.

In order to drive a steel sheet pile, a steel sheet pile driving hole is formed in advance, and a steel sheet pile is driven into the drill hole. Drilling is not possible, and the stratum is crushed and drilled with a drilling machine equipped with a danza hole hammer at the tip.
And in order to form a steel sheet pile pile retaining wall by steel sheet pile continuous driving | running, it is necessary to form continuously the drilling hole for steel sheet pile driving.
In addition, drilling with a danza hole hammer requires time and cost. For hard formations such as hard rock, even if the formation of a danza hole hammer in the hard rock formation is continued in the adjacent form, Unless a uniform lapping hole is formed between the holes, it is impossible to continuously drive the steel sheet pile with the current pile driver.

Even if a large machine is used to attempt lap drilling with a danza hole hammer under the forced guidance of the drilling shaft by a leader, the danza hole hammer is a method of crushing hard rock by moving the bit up and down. Therefore, it is impossible to make continuous lap drilling with a uniform lap drilling part by shifting to the adjacent drilling side with low drilling resistance due to vibration, and at present, uniform continuous lap drilling with danza hole hammer drilling is impossible. There is no work method that can implement holes.
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.

FIGS. 10A and 10B are a combination method of a main pile and a lateral sheet pile mentioned as Conventional Example 1, wherein FIG. 10A is a front view, FIG. 10B is a top view, and FIG. 10C is a schematic diagram of a danza hole hammer.
In other words, the continuous wall construction for retaining the rock in the hard rock formation uses a drilling machine equipped with a danza hole hammer at the tip of the drilling shaft of an auger screw or a cylindrical body (not shown), and the strong power supplied from the drilling shaft. The high-pressure air (10.5 kg / cm ² ) exerts up and down movements on a danza hole hammer that rotates slowly (10-30 rpm), and crushes hard rocks with a powerful drop impact force of a hammer bit to crush holes. By doing so, 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.

Moreover, FIG. 11 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 hole for a normal soft ground layer.
That is, as shown in FIG. 11 (A), the guide device arranged at the tip of the auger is brought into contact with the end of the already-launched steel sheet pile and guided by the leader at the auger base end (motor). 11 (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. 10, 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 arranging 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 the horizontal sheet piles corresponding to the excavation soil of about 1 m and the excavation depth (1 m). Since it is a work to be carried out to a predetermined depth by repeated repetition with the fitting work of, 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, It is difficult work with the risk of accidents, and the efficiency of the work is poor.

Further, the construction method of the conventional example 2 shown in FIG. 11 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, but even if each drilling hole can be formed in a uniform continuous form as shown in FIG. If that is the case, it is impossible to continuously place steel sheet piles in hard formations that are more than soft rock and medium hard rock.
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 enables continuous lap drilling of hard strata that cannot be drilled with an earth auger screw, such as strata mixed with large boulders, hard rocks, medium hard rock strata, etc. It can be continuously driven by a pile driver, a conventional fine vibration vibro pile driver, a conventional non-vibration press-fitting machine, etc. For example, as shown in FIG. Providing technology that can dramatically improve continuous wall construction technology, and that can be used to create a continuous wall for mountain retaining and excavation and excavation along the mountain retaining wall without worrying about disasters and accidents. Is.

In the present invention, for example, as shown in FIG. 1, a steel sheet pile P is driven into a hard rock formation GH into a drilling hole C1 formed by a conventional drilling machine 1 (FIG. 10) provided with a danza hole hammer 3 ′ at the tip. Next, the drilling machine 1 equipped with the dancer hole hammer 3 having the section guide 5 disposed at the tip is engaged with the steel sheet pile section PE to guide the dancer hole hammer 3 with the steel sheet pile P. When connecting the next drilling shaft 2 to the drilling shaft 2 that has been drilled down and entered into the soil, the section guide piece 94 is inserted into the section PE of the steel sheet pile that has been driven using the adapter 9 with a section guide piece. Are engaged with each other, and the drilling shafts 2 are connected to each other, and a drilling hole is drilled to a predetermined depth to form a continuous lap drilling hole C2 having a drilling lap Cw in the existing drilling hole C1, and then the drilling machine 1 The steel sheet pile that has been removed Engaging sections PE adjacent steel sheet pile P into sections PE of those driving a sheet pile P in a continuous wrap drilling in C2.

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 9, the “drilling wrap Cw” is an overlapping portion of the drilling holes C1 and C2 on both sides, and is an area that has been subjected to the drilling action twice when forming each drilling on both sides. “Continuous lap drilling hole C2” means a form in which each of the drilling holes C1 and C2 is kept continuous with the drilling lap Cw, and each steel sheet pile P to be continuously placed as shown in FIG. It is the dimension which accommodates all including the flat plate part PF, the inclination part PS, and the section PE in the drilling holes C1 and C2.

Therefore, according to the present invention, the continuous lap drilling C2 is also formed in the hard rock formation GH under the drilling lap Cw suitably set by the selection of the diameter of the hammer bit 6 and the protruding length of the section guide 5. Since the danza hole hammer 3 is driven under the guidance of the existing steel sheet pile, not only a large leader type danza hole hammer drilling machine but also a hard rock formation GH with a small leaderless danza hole hammer drilling machine Continuous lap drilling is also possible, and continuous lap drilling can be formed. Therefore, continuous placement of steel sheet piles P into the continuous lap drilling is possible with a conventional vibro pile driver, and against the hard rock formation GH Construction of continuous walls for mountain retaining can be carried out safely and with an epoch-making high efficiency, excavation and earthing work on the surface side of the mountain retaining continuous wall can be performed at a high efficiency, and the construction cost can be greatly reduced. Possible That.
When the next drilling shaft is added to the drilling shaft that has entered the soil, the section guide piece 94 is engaged with the section PE of the driven steel sheet pile using the adapter 9 with a section guide. Since the hole shaft is added and the danza hole hammer drilling machine 1 is guided by the steel sheet pile P with the section guide 5 of the dancer hole hammer 3 and the section guide piece 94 of the adapter 9 at the drilled shaft extension position, Bending in the drilling shaft 2 can be suppressed, smooth drilling work with little deviation can be performed, and even if the auger screw 2 is used for the drilling shaft, wear damage of the auger screw can be suppressed to a minimum. .

  Further, in the present invention, for example, as shown in FIG. 1, a steel sheet pile P is formed in a drilling hole C1 formed by a conventional drilling machine 1 (FIG. 10) provided with a danza hole hammer 3 ′ at a tip to a hard rock formation GH. Next, the drilling machine 1 equipped with the danza hole hammer 3 having the section guide 5 disposed at the tip thereof is engaged with the steel sheet pile section PE to engage the danza hole hammer 3 with the steel sheet pile P. When the drill hole is drilled under the guide, and the dancer hole hammer 3 is buried in the ground, the cylindrical section guide 8 is loosely fitted on the outer periphery of the drill shaft 2 and placed on the ground GL. In the state guided by the section guide 5 at the front end of the hammer and the cylindrical section guide 8 on the ground, a continuous lap hole C2 having a hole lap Cw is formed in the existing hole C1 by hitting and drilling to a predetermined depth. No , Rose withdrawn drilling machine 1, engages a section PE adjacent steel sheet pile P into sections PE of already sheet piles P implantation in those driving a sheet pile P in a continuous wrap drilling in C2.

Note that the dancer hole drilling machine 1 is usually a special machine (not shown) in which a cylindrical drilling shaft is extended to the proximal drilling machine and a tipper hole hammer is attached to the tip of the cylindrical drilling shaft. As shown in Fig. 10, there is a danza hole drilling machine in which the screw head at the tip of an auger drilling machine with a ground auger screw attached to the drilling machine at the proximal end is replaced with a danza hole hammer. In both of these models, it means that a cylindrical drill shaft and an auger screw connected to the top of the dancer hole hammer are included.
Since the cylindrical section guide 8 is loosely fitted on the outer periphery of the drilling shaft 2 and allows the vertical insertion of the drilling shaft 2, the cylindrical height is set when the drilling shaft 2 is an auger screw. In order to suppress rattling, the height of the screw 1 pitch or more is required. When the drilling shaft 2 is a cylindrical drilling shaft, the cylindrical height of the cylindrical section guide 8 can be freely selected.

Therefore, according to the present invention, even when the dancer hole hammer 3 enters deep into the ground, the section guide 5 at the tip of the dancer hole hammer and the guide of the drilling shaft 2 at the ground GL position by the cylindrical section guide 8 Therefore, it is possible to suppress the bending at the intermediate part of the drilling shaft 2 and to control the posture of the dancer hole drilling machine that performs vertical vibration drilling. It can be performed smoothly, and wear of members, particularly wear of the section guide 5 fixed to the dancer hole hammer can be suppressed.
And not only a large leader type dancer hole drilling machine, but also a small leaderless dancer hole drilling machine, continuous wall construction for mountain fixing by continuous lap drilling and steel sheet pile continuous driving to hard formation GH However, it can be implemented with safety and groundbreaking efficiency.

Further, as shown in FIG. 6, the cylindrical section guide 8 is a two-part opening / closing type cylindrical ring body 82 having a section guide piece 80, and the guide piece 80 is fitted to a section PE of a driven steel sheet pile. The hole guide shaft 2 is preferably guided by closing the section guide piece 80 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.
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 opening / closing type, the section guide piece 80 is fitted and locked to the section PE of the steel sheet pile projecting portion, and then is loosely fitted and closed to the outer periphery of the drilling shaft 2. 8 is easy to install and close, and the section guide piece 80 is fixed to the steel sheet pile section PE. Thus, the vertical movement of the cylindrical section guide 8 that receives the vertical vibration of 2 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. 1 (C), when the next drilling shaft 2 is added to the drilling shaft 2 that has entered the soil, a section guide piece adapter 9 is used as shown in FIG. The piece 94 is preferably engaged with the section PE of the driven steel sheet pile to connect the drilling shafts 2 to each other.
In this case, the dancer hole hammer drilling machine 1 uses the steel sheet pile P to guide the section guide 5 of the dancer hole hammer 3 and the section guide piece 94 of the adapter 9 at the drilled shaft addition position. Deflection in the shaft 2 can be suppressed, and a smooth drilling action with little displacement can be achieved.

Therefore, even if the auger screw 2 is employed for the drilling shaft, 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 guide is removed. The cylindrical section guide 8 may be rearranged as needed when the attached adapter 9 enters the ground.

  Further, as shown in FIG. 4, the section guide 5 of the dancer hole hammer 3 includes a right section guide piece 5a and a left section guide piece 5b. As shown in FIG. 9, to the steel sheet pile section PE of the right section guide piece 5a. At the time of engagement, the center point (center point of the hammer bit 6) of the dancer hole hammer Oc is shifted to the right by the distance d1 from the steel sheet pile engagement center line OO, and the section guide piece 5b for the left is engaged with the steel sheet pile section PE. In some cases, it is preferable to drill the center point Oc of the danza hole hammer by shifting the distance d1 to the left side from the steel sheet pile engagement center line OO.

In this case, “right side” means the right side when viewed in the construction progress direction of FIG.
As shown in FIG. 9, the steel sheet pile P has a trapezoidal shape in which the cross-sectional shape is a flat plate portion PF and inclined plate portions PS on both sides, and the distal ends of the inclined plate portions PS on both sides are bent to have 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 diameter of the hammer bit 6, is, the smaller the drilling energy is.
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. 9 and due to the offset arrangement of the center point Oc of the danza hole hammer, the entire steel sheet piles P that protrude alternately left and right under a small hole diameter (hammer bit diameter) with less power consumption as shown in FIG. Possible continuous lap drilling C2 rows can be formed, and a continuous lap drilling C2 row of the minimum diameter necessary for continuous placement of the steel sheet pile P can be rationally formed.

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 drilling machine descends are guided and lowered in the already drilled holes C1 and C2. The drilling resistance due to the protrusion attached to the machine can be suppressed 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 a drilling machine 1 equipped with a conventional dancer hole hammer 3 'and have a larger diameter than the intermediate drilling hole C2.
As shown in FIG. 9, 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 lap drilling holes C1 and C2. means.
Further, the first hole C1 and the corner hole C1 are required to have a steel sheet pile continuous wall positioning function, and the first hole C1 in the hole row has a larger diameter than the intermediate hole C2. Next, the first steel sheet pile P is driven and moved backward in the construction progress direction F, so that the adjacent hole C2 can be held under sufficient hole wrap Cw without risk of contact with the steel sheet pile section PE of the hammer bit 6. Can be formed.

Further, at the corner portion, as shown in FIG. 9 (B), the engagement connection form of the steel sheet pile P is different from that of the straight portion, but the large-diameter drilling hole C1 is independently drilled prior to the front and rear drilling 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.
Therefore, the continuous lap drilling hole C2 by the dancer hole hammer drilling machine 1 provided with the section guide 5 becomes a continuous drilling of only 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.

Also, a suitable dancer hole hammer for carrying out the invention of the steel sheet pile continuous driving method of the present application is a dancer hole hammer 3 having a joint portion Jm at the upper end and a hammer bit 6 at the lower end as shown in FIG. The small diameter portion 32 is formed in the outer peripheral case 31 of the dancer hole main body 30 and the sleeve 4 is arranged on the outer periphery of the small diameter portion 32 so as not to move up and down and to be slidably rotatable. The sleeve 4 is engaged with the steel sheet pile section PE. A section guide 5 for sliding is fixed.
Incidentally, the sectional shape of the section guide 5 may be a holding plate as shown in FIGS. 8A and 8B, even if the section guides 5a and 5b are provided on both sides of the partition plate 44 as shown in FIG. 51F, 52F may be arranged in front of section guide pieces on both sides, or as shown in FIG. 8 (C), one section U-shape may be used for both right and left section guides. It only has to be able to guide.

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 distal end of a conventional earth auger drilling machine.
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, it is preferable that the outer surface of the sleeve 4 is substantially 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 the sleeve 4 provided with the section guide 5 is also disposed in the small diameter portion 32 of the case 31, so that the sleeve 4 protrudes from the outer periphery of the case 31. It is possible to suppress the drill hole penetration resistance of the sleeve 4 and the section guide 5, and it is possible to suppress the continuous guide under the engagement sliding by the steel sheet pile section PE of the section guide 5. Up drilling C2 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 sleeve 4 that holds the section guide 5 can be restricted in vertical movement by the upper and lower flanges f 41 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. 3C, 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.

  Further, as shown in FIG. 4, in the present dancer hole hammer 3, the inner sleeve 42 is provided with a fitting portion a 42 at an appropriate position on the outer peripheral surface, the two-part outer sleeves 43 a and 43 b are provided on the inner peripheral surface, and the inner sleeve fitting portion a 42. The outer sleeves 43a and 43b are bolted to the inner sleeve 42 in a state in which the fitting portions b43 of the divided outer sleeves 43a and 43b are fitted to the fitting portions a42 of the inner sleeve. It is preferable to wear it.

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.

Further, in the present invention, the section guide 5 is configured such that the right section guide piece 5a and the left section guide piece 5b are detachably fixed to the holding piece 44P in the flat plate shape of the holder 44 from both sides. The fixing piece 44 </ b> C having the arc inner surface of the holder 44 is preferably 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.

In addition, as shown in FIG. 6, 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 and both sides on the outer surface of a flat plate-shaped fixing plate 81 having cylindrical pieces tu1 at both ends. The section guide piece 80 is arranged in a form in which the partition plate 80w is provided with a protrusion 80e having a bolt hole h80, and two cylindrical ring bodies 82 in a semicircular shape having cylindrical pieces tu2 and tu4 at both ends are provided. The cylindrical piece tu2 at one end is connected to the cylindrical piece tu1 of the fixing plate 81 and the pin P8, and the cylindrical pieces tu3 and tu4 at the other end of the cylindrical ring 82 are connected to each other. The pin can be locked with the pin P8 in a loosely fitted state in a cylindrical form.
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. 6, the protruding form of the protruding portion 80e of the central partition plate 80w may be protruded upward from the upper end level of the section guide piece 80 or may be protruded 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 and the steel sheet pile section PE by the screw bolt S for preventing the vertical blind motion of the cylinder 8, and each cylindrical ring 82 is also connected to both ends of the fixed plate 81. Is the locking means by inserting and removing the pin P8, and the ground GL is in spite of the inner diameter approximate to the outer diameter of the drilling shaft 2 such as an auger screw. The loose fitting operation and the opening / removing operation on the drilling shaft 2 are simple and easy.

  Further, as shown in FIG. 6, the cylindrical section guide 8 includes a tongue piece 82 a that protrudes horizontally and has a bolt hole h 82 at appropriate positions of 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.

  Further, as shown in FIG. 5, a drill shaft adapter 9 that can be suitably employed in the invention of the steel sheet pile continuous driving method of the present application includes a joint pin hole hj and a female joint portion Jf at the lower end, and 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, by allowing the lower end female joint portion Jf and the upper end male joint portion Jm to be pin-jointed with the upper end and lower end joint portions of the conventional drilling shaft 2, the work of adding the drilling shaft 2 is simplified. In addition, when the drilling shaft 2 is added, the section guide piece 94 is engaged with the steel sheet pile section PE, so that the drilling machine added by the adapter includes a section guide 5 at the tip of the dancer hole hammer 3, Drilling action is performed under the guidance of the steel sheet pile section PE by the section guide piece 94 of the drilling shaft extension adapter 9, and smooth lap drilling in which bending deformation of the drilling shaft can be suppressed becomes possible.

Further, as shown in FIG. 5, the sleeve shaft adapter has a sleeve 92 that is provided with guide flanges f91 at the upper and lower ends thereof, and is rotatable on a cylindrical sleeve guide 91 that is 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. It is possible to achieve accurate position guidance for the steel sheet pile section PE, and to make the dancer hole hammer drilling machine 1 suitable for right and left use of the steel sheet pile P under smooth guidance that does not cause deflection in the vertical direction. A deviated predetermined lap drilling C2 row can be formed, and the lap drilling C2 row for continuous steel sheet pile driving can be neatly formed by the small-diameter drilling holes C2 that can be drilled with small drilling power.
Moreover, 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 machine 1 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, it is also continuous with the hard rock formation GH under the drilling wrap Cw suitably set by selecting the diameter of the hammer bit 6 and the protruding length of the section guide 5. The lap drilling holes C2 can be formed, and the dancer hole hammer 3 is driven under the guidance of the existing steel sheet pile P. Therefore, not only a large leader type dancer hole hammer drilling machine but also a small leaderless dancer hole hammer drilling Continuous lap drilling into the hard rock formation GH with a machine is also possible, and a continuous lap drilling row corresponding to the steel sheet pile P to be continuously cast can be formed. Therefore, the steel sheet pile P can be continuously inserted into the continuous lap drilling row. Placing can be done with a conventional vibro pile driver, and the construction of a continuous wall for retaining the hard rock formation GH and excavation and excavation along the retaining wall are safe and revolutionary. Construction costs Significant reduction of it is possible.
Moreover, since the adapter 9 with the section guide piece is also used for adding the drilling shaft, the dancer hole hammer drilling machine 1 includes the section guide 5 of the dancer hole hammer 3 and the section guide piece 94 of the adapter 9 at the drilling shaft adding position. Are guided by the steel sheet pile P, and the bending of the long drilling shaft 2 can be suppressed, resulting in a smooth drilling operation with little deviation.

  Further, if the cylindrical section guide 8 is used in combination with the steel sheet pile continuous driving method of the present application, even when the dancer hole hammer 3 enters deep into the ground, the section guide 5 at the tip of the dancer hole hammer and the ground by the cylindrical section guide 8 are used. Since it is a guide drilling up and down with the guide of the drilling shaft 2 to the GL position, it becomes possible to control the posture of the dancer hole hammer drilling machine that performs vertical vibration drilling, and the continuous lap drilling is performed smoothly. It is possible to suppress the wear of the members, particularly the wear of the section guide 5 fixed to the dancer hole hammer.

In addition, the danza hole hammer 3 used in the steel sheet pile continuous driving method of the present application is a stage where the soft surface layer is drilled with a conventional earth auger screw while reaching the hard rock formation according to the construction layer. To drill holes by attaching and detaching, after drilling the hole C1 at the beginning and corner of the hole array with a conventional dancer hole hammer drilling machine, only the danza hole hammer is used when forming the continuous lap hole C2. It can be used with detachment and replacement, and it has good operability.
Further, since the sleeve 4 provided with the section guide 5 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, the resistance to drilling holes of the sleeve 4 and the section guide 5 can be suppressed. The continuous lapping hole C2 can be smoothly drilled under the engagement sliding by the steel sheet pile section PE.

  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, and it is easy to press and fix the projecting portion 80e of the central partition plate 80w and the steel sheet pile section PE with a screw bolt for preventing the vertical and vertical blind movement of the cylindrical section guide 8. Since it is a locking means by inserting and removing the pin P8 with the both side ends of the fixed plate 81 as the rotation center, and the locking means by inserting and removing the pin P8, it has an inner diameter approximate to the outer diameter of the drilling shaft 2 such as an auger screw. Nevertheless, the loose fitting and release operation to the drilling shaft 2 on the ground GL is simple and easy.

  Further, the adapter 9 for drilling shaft extension 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 joints of the conventional drilling shaft 2. The joint of the drilling shaft 2 can be performed easily and easily by pin-jointing the part, and when the drilling shaft 2 is added, the section guide piece 94 is engaged with the steel sheet pile section PE. The hole drilling machine 1 added by the drilling operation 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. Smooth lapping can be achieved in which bending deformation of the shaft can be suppressed.

[Danza Hall Hammer (Figs. 3 and 4)]
The dancer hole hammer 3 (FIG. 3) 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 part, 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 the internal structure and the 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 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, and a case upper part 31 u and a case lower part 31 d are prepared, and a separately prepared case small diameter part with an outer diameter of 355.6 mm and a thickness of 15 mm As shown in FIG. 4 (A), a case upper part 31u (standard length: 1500 mm), a small diameter part 32 (standard length: 500 mm), and a case lower part 31d (standard length: 300 mm) ) Is prepared.

  Also, sleeve guides 41a and 41b in a semi-cylindrical shape with 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 case small-diameter portion 32, and as shown in FIG. 41a and 41b, and the connection line between the flange f41 and the case upper part 31u and the case lower part 31d are the welding lines Lm, and the outer periphery of the flange f41 is the same as the case upper part 31u and the case lower part 31d. 32 is integrated.

Next, the inner sleeve 42a and the inner sleeve 42b having a thickness of 26 mm in which a rectangular flat fitting convex portion a42 is arranged on the outer peripheral surface in a two-divided form of the cylinder are placed on the sleeve guide 41 as shown in FIG. 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. 4 (A), one of the outer sleeves 43a and 43b has a holder 44 comprising 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. Are fixed by welding as shown in FIG.

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. 10C), and a mounting pin. Fasten at P3 to make the present invention dancer hole hammer.
Then, as shown in FIG. 3C, a right section guide piece 5a and a left section guide piece 5b each provided with 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 fixing of the holder 44 to the sleeve 4 may be performed 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. 6)]
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 work of the dancer hole hammer drilling machine 1. As shown in FIG. 6A, 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.
6 (A) is a plan view of the fitting and closing configuration of the cylindrical section guide 8, FIG. 6 (B) is an exploded plan view, FIG. 6 (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. 6B, the cylindrical section guide 8 has a semi-cylindrical shape on both sides, which is pinned to both side ends of a fixed plate 81 having a section guide piece 80 by a connecting pin P8. And a semi-cylindrical inner ring body 83 disposed on the inner peripheral portion of each cylindrical ring body 82.

  As shown in FIG. 6D, each cylindrical ring 82 has a cylindrical piece tu2 at one end that is fixed to the fixing plate 81 and maintains a space St, and the other end is one cylindrical ring. 82 has a cylindrical piece tu3 up and down with a spacing St, and the other cylindrical ring body 82 has a cylindrical piece tu4 with a height Lt that can be fitted into the spacing St at the center, and a bolt hole h82 from the upper edge. The provided tongue piece 82a has a structure projecting outward and has a height of about 40 cm, and the inner diameter D8 when closed in a cylindrical shape is a danza hole with 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 auger screw diameter of the hammer of 550 mm, it is set to 560 mm (D8).

The fixing plate 81 is a steel plate having a thickness of 10 mm, a width of 100 mm, and a height equal to that of the cylindrical ring body 82 (40 cm), and at the center of both side edges, at the interval St of the cylindrical piece tu2 of the cylindrical ring body 82. A cylindrical piece tu1 having a height Lt to be fitted is arranged.
As shown in FIG. 6 (B), 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 is 30 mm above and below the cylindrical ring body 82. The casting is integrally cast into a protruding form, a bolt hole h80 is provided in the protruding portion 80e of the partition plate 80w, and welding is integrated with the outer surface of the fixed plate 81.
A cylinder that can be opened and closed around the fixing plate 81 by inserting and locking the cylindrical pieces tu1 at the center of both side edges of the fixing plate 81 and the cylindrical pieces tu2 at the upper and lower ends of each cylindrical ring member 82 by connecting pins P8. A 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. This is a replaceable two-piece cylindrical piece for imparting durability and versatility to the ring body 82. As shown in FIG. 6 (B), it is a two-piece half-cylindrical shape, outward from the upper edge. A tongue piece 83a provided with a bolt hole h83 is provided so as to protrude, 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, 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. The connecting pin P8 can be inserted and locked to the cylindrical pieces tu3 and tu4 on the outer wall, and the section guide piece 80 is engaged with the steel sheet pile section PE even while the dancer hole hammer drilling machine is in operation. The cylindrical shaft guide 8 is moved up and down at the ground GL position by engaging and closing the hole shaft 2 at the ground GL position and screwing the bolt S into the steel sheet pile section PE from the bolt hole h80 of the partition plate protrusion 80e. The guide function of the drilling shaft 2 can be achieved without blind movement.

[Adapter for drilling shaft (Fig. 5)]
5A is an exploded perspective view of the adapter 9 for drilling shaft, FIG. 9B is an assembled perspective view, and FIG. 5C is a completed perspective view of the adapter.
As is apparent from FIG. 9C, the adapter 9 of the present invention is provided with a male joint portion Jm at the upper end of the rod piece 90 and a female joint portion Jf at the lower end, similarly to a conventional drilling shaft adapter (not shown). A half sleeve guide 91a, 91b having a flange f91 on the upper and lower sides is fitted on the outer periphery of the rod piece 90 and welded and integrated with the rod piece 90. The half sleeve 92a is placed on the sleeve guide 91. , 92b are fitted, and as shown in FIG. 5 (B), a sleeve 92 is formed that is integrated with the weld line Lm, can be slidably rotated on the sleeve guide 91, and cannot be moved up and down by the flange f91. A holder 93 composed of a fixing piece 93C having an arc inner surface and a plate-like holding piece 93P in which a bolt hole h93 is provided vertically is fixed to the sleeve 92 by welding or screws.
Further, as shown in FIG. 5B, 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.
The height L93 of the holder 93 is formed to be about twice the height L93C of the fixed piece 93C. The sleeve guide 91 and the sleeve 92 are disposed under the condition that the length of the rod piece 90 is suppressed, and The section guide pieces 94a and 94b provided with a sufficient length for smooth guidance in the fitting groove 94G can be adopted, which is advantageous as the adapter 9 in the middle of the drilling shaft 2 that is easily displaced.

[Construction (Fig. 1, Fig. 9)]
For the hard rock formation GH, the first drilling hole C1 is independently drilled by a conventional dancer hole hammer drilling machine (FIG. 10).
In this case, even if it is a leader type dancer hole hammer drilling machine or a leaderless dancer hole hammer drilling machine, since it is an independent drilling, it can drill.
Next, as shown in FIG. 2, the leaderless dancer hole hammer drilling machine 1 in which the section guide 5 is mounted on the dancer hole case, and the section guide 5 is driven into the first drilling hole C1 as shown in FIG. Drilling operation is performed in the state where the steel sheet pile P is engaged with the section PE, and as shown in FIG. 1 (B), the temporary drilling operation is stopped when the danza hole hammer 3 enters and embeds in the ground. The guide 8 is placed on the ground GL by engaging the engaging groove 8G of the section guide piece 80 shown in FIG. 6 from the upper end of the steel sheet pile section PE, and the cylindrical ring body 82 is auger screw (drilling shaft) 2. It is loosely fitted to the outer diameter and closed, and the connecting pin P8 is inserted and locked to the cylindrical pieces tu3 and tu4 at both ends of the cylindrical ring body 82, and the bolt S is screwed into the bolt hole h80 of the partition plate protrusion 80e. Press against section PE After suppressing the vertical acting blindly cylindrical section guides 8 and fastened to resume the drilling work of the drilling machine 1.

Next, as shown in FIG. 1C, when the second drilling shaft 2 needs to be added to the first drilling shaft 2 equipped with the dancer hole hammer 3, the drilling operation of the drilling machine 1 is performed. Is temporarily suspended and the cylindrical section guide 8 is opened and removed above the steel sheet pile section PE, and then the adapter 9 with a section guide shown in FIG. 5 is connected to the engagement groove 94G of the section guide piece 94 in the steel sheet pile section PE. Engage, connect the upper and lower drilling shafts 2 at the joints Jm, Jf at the upper and lower ends, restart the dancer hole hammer drilling machine 1 and embed the adapter 9 with section guide in the ground. If necessary, once again, the cylindrical section guide 8 is loosely fitted on the outer periphery of the drilling shaft 2 with the ground GL, and when the lap drilling C2 having the drilling lap Cw is formed to a predetermined depth, the drilling machine 1 is lifted and removed. Then, FIG. ) As in vibro pile driver 10 of the conventional and pouring into the lap drilling C2 under the engagement section PE of the steel sheet pile P with the existing steel sheet pile P.
By repeating the above steps, a steel sheet pile is continuously placed in the continuous lapping hole C2.

  As shown in FIG. 9 (A), the continuous lapping hole array is formed by forming a punching hole C2 for the steel sheet pile P projecting from the flat plate portion PF on the right side when viewed in the construction progress direction F. The section guide 5 of the hole hammer 3 engages the section guide piece 5a for the right side with the section PE of the already-placed steel sheet pile, and the hammer bit center point Oc (drilling center point) is from the steel sheet pile meshing center line OO. Similarly, in the steel sheet pile hole C2 which is shifted to the right of d1 and protrudes to the left in the traveling direction F, the hammer bit center point is located under the engagement of the left section guide piece 5b with the steel sheet pile section PE. Drill Oc by shifting d1 to the left from the steel sheet pile meshing center line OO.

In this case, as shown in FIG. 7B, the outer periphery of the hammer bit 6 is not in contact with the steel sheet pile section PE, and the section guide 5 is drilled in a dimensional form that descends in the already drilled hole. Since the hole wraps Cw can be formed in C1 and C2, and each hole C2 is displaced in the protruding direction of the flat plate portion PF of the steel sheet pile, Each steel sheet pile P can be completely continuously driven into the drilling hole C2 row, and the steel sheet pile continuous driving by the small diameter drilling hole C2 row with low drilling energy consumption can be achieved.
Accordingly, as shown in FIG. 9 (B), the first drilling hole C1 and the corner drilling hole C1 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. By implementing the continuous lapping hole C2 with the required minimum diameter with the large diameter and the dancer hole hammer 3 provided with the section guide 5, rationalization of the construction cost can be achieved.

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. Therefore, wear due to lateral deflection of the drilling machine 1 can be suppressed.
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.

3 and 4 has a structure in which the sleeve 4 is bolted to the outer sleeve 43 on the inner sleeve 42. Therefore, 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. 6, 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 on 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.

Further, the section guide 5 of the dancer hole hammer 3 may be configured as a left and right engagement groove 51G having a holding piece 51F at the tip of a central protruding separation piece as shown in FIG. 8A, as shown in FIG. 8B. As shown in FIG. 8C, the cross section is U-shaped as shown in FIG. 8C, and is fixed to the tip of the holder 44. It is good also as a type which plays the function of each right and left engaging groove by the engaging groove 53G.
In addition, it is advantageous to suppress wear of the case 31 if steel rods having a short cross section are arranged vertically at regular intervals on the outer periphery of the case upper portion 31u and the case lower portion 31d of the dancer hole hammer 3.
The engaging grooves of the section guide piece 94 of the adapter 9 with section guide and the section guide piece 80 of the cylindrical section guide 8 are the same as the engaging grooves 5G, 51G, 52G, 53G of the section guide 5 of the dancer hole hammer 3. Or different forms.

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 lap cutting. It is a figure which shows the steel sheet pile driving | running | working state in a hole. It is explanatory drawing of a dancer hole hammer drilling machine, Comprising: (A) is the state which mounted | worn with the dancer hole hammer for lapping holes, (B) is a figure which shows the conventional dancer hole hammer for replacement | exchange. It is explanatory drawing of this invention danza hole hammer, (A) is an assembly state, (B) is a disassembled state, (C) is the figure assembled for the conventional dancer hole hammer. It is explanatory drawing of this invention dancer hole hammer, (A) is an exploded perspective view, (B) is the perspective view which assembled the sleeve guide, (C) is the perspective view which assembled the inner sleeve. 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 an assembled state plan view, (B) is an exploded state plan view, (C) is a joined state plan view of a cylindrical ring body and an inner ring body, (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 line BB of (A), and (C) is C of (A). FIG. It is operation | movement explanatory drawing of a section guide, Comprising: (A) is a 1st modification, (B) is a 2nd modification, (C) is a 3rd modification, (D) is different in a 3rd modification. It is a top view which shows an action form. It is a steel sheet pile driving explanatory drawing in the drilling row, (A) is a straight line part and (B) is a figure showing 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 Drilling machine (Danza hole hammer drilling machine)
2 Drilling shaft (auger screw)
3,3 'Danza hole hammer 4,92,92a, 92b Sleeve 5,51,52,53 Section guide 5a Section guide piece for right (section guide piece)
5b Section guide piece for left (section guide piece)
5G, 51G, 52G, 53G, 8G, 94G Engagement groove 6 Hammer bit 7 Adapter 8 Cylindrical section guide 9 Adapter with section guide (adapter, fitting)
10 Vibro pile driver (pile driver)
30 Danza Hall Main Body 31 Case 31u Upper Case 31d Lower Case 32 Small Diameter (Case Small Diameter)
41, 41a, 41b, 91, 91a, 91b Sleeve guide 42, 42a, 42b Inner sleeve 43, 43a, 43b Outer sleeve 44 Partition plate (holder)
44C, 93C Fixed piece 44P, 93P Holding piece 51F, 52F Holding plate 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 94, 94a, 94b section guide piece 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, h80, h82, h83, h93, h94 Bolt hole C1 First drilling (corner drilling, drilling)
C2 Continuous lapping (intermediate drilling, drilling)
Cw Drilling wrap JP1, JP2, JP3 Mounting pin part P Steel sheet pile PE Section PF Flat plate part PG Engaging groove PS Inclined plate part P3 Mounting pin P8 Connecting pin S Screw bolt (bolt)
tu1, tu2, tu3, tu4 cylindrical piece

Claims (16)

A steel sheet pile (P) is driven into a hard rock formation (GH) into a drilling hole (C1) formed by a conventional drilling machine (1) equipped with a danza hole hammer (3 ') at the tip, and then the tip. With the drilling machine (1) equipped with the danza hole hammer (3) with the section guide (5) disposed on the section guide (5), the section guide (5) is engaged with the steel sheet pile section (PE) and the danza hole hammer (3) is When drilling under the guide of the steel sheet pile (P) and adding the next drilling shaft (2) to the drilling shaft (2) that has entered the soil, the adapter with section guide piece (9) is attached. The section guide piece (94) is engaged with the section (PE) of the driven steel sheet pile, the drilling shafts (2) are connected to each other, and the drilled holes are drilled to a predetermined depth. ) To form a continuous lapping hole (C2) having a lapping hole (Cw) Then, the drilling machine (1) is lifted and removed, and the section (PE) of the adjacent steel sheet pile (P) is engaged with the section (PE) of the driven steel sheet pile (P) to continuously wrap the steel sheet pile (P). A steel sheet pile continuous placement method for hard rock formation, which is driven into the drilling hole (C2).
  A steel sheet pile (P) is driven into a hard rock formation (GH) into a drilling hole (C1) formed by a conventional drilling machine (1) equipped with a danza hole hammer (3 ') at the tip, and then the tip. With the drilling machine (1) equipped with the danza hole hammer (3) with the section guide (5) disposed on the section guide (5), the section guide (5) is engaged with the steel sheet pile section (PE) and the danza hole hammer (3) is Under the guidance of the steel sheet pile (P), the drilling hole is drilled, and when the danza hole hammer (3) is buried in the ground, the cylindrical section guide (8) is loosely fitted to the outer periphery of the drilling shaft (2). Placed on the ground (GL) and drilled to a predetermined depth with the hole drilling machine guided by the section guide (5) at the tip of the dancer hole hammer and the cylindrical section guide (8) on the ground. The hole (C1) has a drilling wrap (Cw) The lap drilling hole (C2) is formed, and then the drilling machine (1) is lifted and removed, and the section (PE) of the adjacent steel sheet pile (P) is engaged with the section (PE) of the driven steel sheet pile (P). Steel sheet pile (P) is continuously driven into a continuous lapping hole (C2).   The cylindrical section guide (8) is a two-part open / closed cylindrical ring body (82) provided with a section guide piece (80), and the guide piece (80) is fitted into a section (PE) of a driven steel sheet pile. In addition, the section guide piece (80) is fixed 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 to guide 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 inserted using the adapter (9) with a section guide piece. The steel sheet pile continuous placing method according to claim 2 , wherein the drill shaft (2) is connected to each other by engaging with the section (PE).
  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 side (d1) from the steel sheet pile engagement center line (OO), and the section guide piece for the left (5b) is connected to the steel sheet pile section (PE). 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.   A dancer hole hammer (3) provided with a joint portion (Jm) at the upper end and a hammer bit (6) at the lower end, and a small diameter portion (32) is formed on the outer case (31) of the dancer hole body (30). The sleeve (4) is arranged on the outer periphery of the small-diameter portion (32) so as not to move up and down and is slidably rotatable, and the sleeve (4) is a section guide for engaging and sliding with the steel sheet pile section (PE). 5) Danza hole hammer for continuous lap drilling used in the steel sheet pile continuous placement method to hard rock formations.   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). The dancer hole hammer according to claim 8, 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. 10) The danza hole hammer according to claim 9, 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 8 to 10, wherein a fixing piece (44C) having an arc inner surface of (44) is fixed to an outer periphery of the sleeve (4).   On the outer surface of the flat plate-shaped fixing plate (81) provided with cylindrical pieces (tu1) at both ends, the central partition plate (80w) and the section guide pieces (80) on both sides are provided, and the partition plate (80w) is bolt holes. The two cylindrical rings (82) in a semicircular shape with the projecting portions (80e) having (h80) and the cylindrical pieces (tu2, tu4) at both ends are respectively connected to the cylindrical pieces at one end. (Tu2) is connected to the cylindrical piece (tu1) of the fixed plate (81) and the pin (P8), and the cylindrical pieces (tu3, tu4) at the other ends of the cylindrical ring (82) are connected to each cylindrical ring (82). ) Is a cylindrical section guide used in a steel sheet pile continuous driving method to a hard rock formation, which can be pin-locked with a pin (P8) in a state in which the outer periphery of the drilling shaft (2) is loosely fitted in a cylindrical shape.   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 12, 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 14, 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 14 or 15, 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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