JP2004197565A - Steel sheet pile continuous piling method to hard rock stratum and tool used for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a breasting continuous wall by continuously driving steel sheet pilings by applying continuous lap drilling to hard rock stratum. <P>SOLUTION: The first drilled hole C1 in a first continuous row and a drilled hole C1 at the corner portion form independent drilled holes C1 by a commonly used down-the-hole hammer drilling machine; the continuous drilled hole C2 for the drilled hole C1 forms a continuous lapped drilled hole C2 row having a drill-holed lap Cw at the existing drilled hole C1 while linking and guiding a section guide 5 to a section PE of a driven steel sheet pile P by using the down-the-hole hammer 3 equipped with a section guide 5 by using the down-the-hole hammer 3 equipped with the section guide 5 at the tip portion; and the steel sheet piles P are driven to the continuously lapped, drilled holes C1 and C2 rows. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention enables a continuous wall to be formed with steel sheet piles for retaining to prevent earth and sand collapse in a stratum of hard rock or a large boulder layer, and makes it difficult or impossible to drill an auger screw. The present invention relates to a method for continuously placing steel sheet piles by continuously lapping a stratum in a stratum with a danza hole hammer, and to a tool (equipment) used in the method. Belong to.

In order to drive steel sheet piles, drilling holes for driving steel sheet piles are formed in advance, and steel sheet piles are driven into the drilling holes. Drilling is impossible, and drilling is performed by crushing the stratum with a drilling machine equipped with a danza hole hammer at the tip.
Then, in order to form the steel sheet pile retaining wall by continuous driving of the steel sheet pile, it is necessary to continuously form holes for driving the steel sheet pile.
In addition, drilling with a danza hole hammer requires time and cost, and in the case of a hard formation such as hard rock, even if a danza hole hammer drilling is continuously formed in an adjacent form in a hard rock formation, each drilling is required. Unless a uniform lap hole is formed between the holes, continuous driving of steel sheet pile with the current pile driver is impossible.

Also, using a large machine, even if you attempt lap drilling with a danza hole hammer under the forced guidance of the drilling axis by the leader, the danza hole hammer is a method of moving hard bits up and down to beat hard rock. Therefore, continuous lap drilling with uniform lap drilling is not possible due to vibration and it shifts to the adjacent drilling side with low drilling resistance, and at present, uniform continuous lap drilling with danza hole hammer drilling is impossible. There is no feasible method of drilling holes.
Therefore, the formation of continuous walls for retaining a stratum drilled with a danza hole hammer, such as a hard rock stratum, is currently carried out by a combined method using a parent pile (H-shaped steel) and a horizontal sheet pile.

FIGS. 10A and 10B show a method of using a parent pile and a horizontal sheet pile together as a conventional example 1, in which (A) is a front view, (B) is a top view, and (C) is a schematic view of a danza hole hammer.
In other words, the continuous wall formation for retaining the rock in the hard rock formation is performed by using a drilling machine in which a danza hole hammer is attached to the tip of a drilling shaft of an auger screw or a cylindrical body (not shown), and a powerful drilling machine supplied from the drilling shaft. A high-pressure air (10.5 kg / cm ² ) applies a vertical motion to a danzahole hammer that rotates slowly (10 to 30 rpm), and crushes hard rock with a powerful drop impact force of a hammer bit. Thereby, independent drillings are formed at regular intervals of 1 to 2 m.

  Next, an H-shaped steel as a parent pile is driven into each drilled hole, and one side (surface) of the H-shaped steel row driven at regular intervals is excavated and excavated by an excavator. A fixed length horizontal sheet pile, such as a wooden board, is inserted into the parent pile span, and the excavation and excavation work at a depth of about 1 m that does not cause ground collapse, and the insertion work of the horizontal sheet pile on the discharge surface are repeatedly performed at a predetermined depth. Up to the excavation floor, a continuous wall for mountain retaining is created by a parent pile (H-shaped steel) and a horizontal sheet pile fitted and locked between the parent piles in a crossing manner, and sediment and rock on the other side (back side) of the continuous wall It prevents collapse.

FIG. 11 is a patent document and discloses a concept of continuously forming a drill hole for driving a steel sheet pile in auger screw drilling of a normal soft ground.
That is, as shown in FIG. 11 (A), a guide device arranged at the tip of the auger is guided in contact with the end of the already driven steel sheet pile, and the guide is guided together with the leader at the auger base (motor). As shown in FIG. 11 (B), there is disclosed a concept in which each of the drilled holes 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, the current parent pile and horizontal sheet pile combination method, at regular interval drilling by a danza hole hammer drilling machine → a parent pile (H-shaped steel) is driven into the drilling → parent. Excavation on one side of the row of piles → the cross-fitting of the horizontal sheet pile between the parent piles is required, and the number of steps is large and complicated.
In particular, when the horizontal sheet pile is fitted to the H-section steel, the work is performed while preventing the collapse of earth and sand during excavation. Therefore, the excavation discharge of about 1 m and the horizontal sheet pile corresponding to the excavation depth (1 m). Since the work is carried out to a predetermined depth by repeating the insertion work of the pile, the non-digging stratum on the back side of the parent pile row, the ground collapse to the excavation and unloading side on the surface side of the parent pile row, disaster, The construction is difficult due to the danger of accidents, and the efficiency of the construction is poor.

Further, the method of 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, and crushed rock fragments by hitting the drilled surface by vertical vibration of a hammer. It is not a technique that suggests application to a danza hole hammer drilling, which discharges and excavates from the drilling to the ground. Even if each drilling can be formed in a uniform continuous form as shown in FIG. Therefore, it is impossible to continuously cast steel sheet piles in hard formations of soft rock and medium hard rock or higher.
That is, even in the case of uniform continuous drilling, each drilling has a considerable drilling lap, and the area around the driving portion of each steel sheet pile section is crushed soft soil by overlapping (lapping) drilling. Unless steel sheet pile is continuously driven, it is impossible.

  The present invention enables continuous lap drilling in hard strata that cannot be drilled with an earth auger screw, such as strata mixed with large boulders, hard rock, and medium hard rock strata. It enables continuous driving with a pile driver, a conventional microvibration vibro pile driver, a conventional non-vibration press-fitting machine, etc. For example, as shown in FIG. Provide innovative technology to improve the continuous wall construction technology, and eliminate the risk of disasters and accidents, and enable highly efficient construction of continuous wall for retaining and excavating and discharging along the retaining wall. Things.

  According to 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 hole C1 formed by a conventional drilling machine 1 (FIG. 10) having a danza hole hammer 3 'at the tip. Then, the section guide 5 is engaged with the steel sheet pile section PE by the drilling machine 1 equipped with the danza hole hammer 3 in which the section guide 5 is disposed at the tip, and the danza hole hammer 3 is guided by the steel sheet pile P. A continuous lap drilling C2 having a drilling lap Cw in the drilled hole C1 is formed by hitting and drilling below a predetermined depth, and then the drilling machine 1 is lifted up and removed, and the section PE of the punched steel sheet pile P is removed. Is engaged with the section PE of the adjacent steel sheet pile P to drive the steel sheet pile P into the continuous lap hole C2.

The hard rock formation GH refers to a formation of hard rock or a large boulder layer, or a hard formation that cannot be drilled by an earth auger drilling machine, such as a hard rock or a large boulder layer overlapping with other soil. It is a generic term.
Also, as shown in FIG. 1 and FIG. 9, the “drilling wrap Cw” is a portion where the drilling holes C1 and C2 on both sides overlap, and a region which has been twice drilled when forming drilling holes on both sides. "Continuous lap drilling C2" means a form in which each drilling C1 and C2 are continuous while maintaining the drilling lap Cw, and as shown in FIG. All dimensions including the flat part PF, the inclined part PS, and the section PE are accommodated in the holes C1 and C2.

  Therefore, according to the present invention, below the drilling lap Cw suitably set by the selection of the diameter of the hammer bit 6 and the projection length of the section guide 5, the continuous lap drilling C2 is formed also in the hard rock formation GH. Since the danza hole hammer 3 can be formed and driven under the guidance of the existing steel sheet pile, the hard rock formation GH can be obtained not only with a large leader type danza hole hammer drill but also with a small leaderless danza hole hammer drill. Continuous lap drilling is also possible, and continuous lap drilling can be formed. Therefore, continuous driving of steel sheet pile P into continuous lap drilling becomes possible with a conventional vibro pile driving machine, and the hard rock formation GH Construction of continuous walls for mountain retaining can be carried out safely and under an epoch-making high efficiency, and excavation and excavation work on the surface side of the continuous retaining wall can be performed at a stretch with high efficiency, greatly reducing construction cost. Possible That.

  Further, as shown in FIG. 1, for example, as shown in FIG. 1, a steel sheet pile P is formed in a drill hole C1 formed in a hard rock formation GH by a conventional drill machine 1 (FIG. 10) having a danza hole hammer 3 'at the tip. Then, the section guide 5 is engaged with the steel sheet pile section PE by the drilling machine 1 equipped with the danza hole hammer 3 having the section guide 5 disposed at the distal end, and the danza hole hammer 3 is moved with the steel sheet pile P. When the hammer 3 is buried in the ground, the cylindrical section guide 8 is loosely fitted on the outer periphery of the boring shaft 2 and is mounted on the ground GL. While being guided by the section guide 5 at the tip of the hammer and the cylindrical section guide 8 on the ground, a continuous lap drilling C2 having a drilling lap Cw is formed in the drilled hole C1 by hitting and drilling to a predetermined depth. I , 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.

In addition, the drilling hole drilling machine 1 is usually a dedicated drilling machine (not shown) in which a cylindrical drilling shaft is extended from a drilling machine at the base end and a danza 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 a screw head at the tip of an auger drilling machine having an earth auger screw attached to a base drilling machine is replaced with a danza hole hammer. In both of these models, the meaning includes both the cylindrical drilling shaft and the auger screw connected to the upper part of the danza hole hammer.
Since the cylindrical section guide 8 is loosely fitted on the outer periphery of the drilling shaft 2 and allows the vertical movement of the drilling shaft 2, when the drilling shaft 2 is an auger screw, the cylindrical height is In order to suppress rattling, it is necessary to set the height of the screw to one pitch or more. 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 danza hole hammer 3 enters deep into the ground, the guide of the drilling shaft 2 at the ground GL position by the section guide 5 at the tip of the danza hole hammer and the cylindrical section guide 8 can be obtained. Guide drilling in the upper and lower sides of the drilling hole, it is possible to suppress the deflection in the middle part of the drilling shaft 2 and to control the posture of a danza hole drilling machine that performs vertical vibration drilling, making continuous lap drilling work possible. It can be performed smoothly, and the wear of the members, in particular, the wear of the section guide 5 fixed to the danza hole hammer can be suppressed.
In addition to a large-sized leader-type danza hole drilling machine, a small-sized leaderless danza-hole drilling machine can also be used to form a continuous wall for mountain retaining by continuous lap drilling in the hard formation GH and continuous driving of steel sheet pile. However, it can be carried out safely and with a revolutionary high efficiency.

As shown in FIG. 6, the cylindrical section guide 8 is a two-part openable / closable cylindrical ring body 82 provided with a section guide piece 80, and the guide piece 80 is fitted into the section PE of the punched steel sheet pile. It is preferable that the section guide piece 80 be 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, a screw hole (not shown) is arranged in the section guide piece 80, a screw bolt is screwed into the section guide piece 80, and the bolt tip is pressed against the steel sheet pile section PE. Fastening is possible.

Therefore, since the cylindrical section guide 8 is a two-piece openable / closable type, the section guide piece 80 is fitted and locked in the section PE of the steel sheet pile projecting portion, and then is loosely fitted and closed on 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. The vertical movement of the cylindrical section guide 8 which receives the vertical vibration of the drill 2 can be suppressed, and the drill shaft 2 can be smoothly guided.
In this case, the two-part type cylindrical ring body 82 is advantageous in the closing and opening operation by insertion and withdrawal with the connecting pin P8, and as shown in FIG. When the inner ring body 83 is replaced, the inner ring body 83 can cope with a change in the diameter of the drilling shaft 2 or a sliding abrasion, 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, the section guide piece adapter 9 as shown in FIG. Preferably, the piece 94 is engaged with the section PE of the driven steel sheet pile to connect the drilling shafts 2 to each other.
In this case, the danza hole hammer drilling machine 1 uses the steel sheet pile P to guide the section guide 5 of the danza hole hammer 3 and the section guide piece 94 of the adapter 9 at the drilling shaft extension position. The deflection of the shaft 2 can be suppressed, and a smooth drilling action with little deviation can be achieved.

Therefore, even if the auger screw 2 is used as 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 needed. If the cylindrical section guide 8 is being drilled, the cylindrical section guide 8 is removed when the drilling shaft 2 is added, and the section guide is removed. When the attached adapter 9 enters the ground, the cylindrical section guide 8 may be rearranged as necessary.

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

In this case, “right side” means the right side when viewed in the construction progress direction in FIG. 9.
As shown in FIG. 9, the steel sheet pile P has a trapezoidal cross-sectional shape of the 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 include the engagement grooves PG. The continuous wall of the steel sheet pile is connected by the engagement of the section PE in a form in which the flat plate portion PF alternately projects rightward and leftward from the steel sheet pile meshing center line O-O position. is there.
Therefore, the “right section guide” means a section guide to be engaged with the section PE when forming the drilled hole C2 for the steel sheet pile P projecting rightward from the center line OO.

In addition, the smaller the hole diameter, that is, the diameter of the hammer bit 6, of the drilling holes C1 and C2 for driving the steel sheet pile is advantageous because the drilling energy is reduced.
In this case, since the section guides 5 are provided for the right and left sides, the section guide pieces 5a and 5b can be selectively used both when drilling for the right-side projecting steel sheet pile and when drilling for the left-side projecting steel sheet pile. As a result, as shown in FIG. 9, the entire arrangement of the steel sheet piles P projecting alternately from side to side under a small drilling diameter (hammer bit diameter) with low power consumption as shown in FIG. A possible continuous lap hole C2 row can be formed, and a minimum diameter continuous lap hole C2 row required for continuous driving of the steel sheet pile P can be reasonably formed.

Further, it is preferable that each steel sheet pile P is driven into the corresponding drilling C1, C2 while being shifted rearward in the traveling direction F with respect to the corresponding drilling C1, C2.
In this case, the section guide 5 of the danza hole hammer 3 and the section guide piece 94 of the adapter 9 descending in the ground as the drilling machine descends, are guided down in the drilled holes C1 and C2, and are drilled. The drilling resistance due to the projection 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 state where the hammer bit 6 is not in contact with the steel sheet pile section PE.

It is preferable that the first drilling C1 and the corner drilling C1 be performed by a drilling machine 1 provided with a conventional danza hole hammer 3 'and have a larger diameter than the intermediate drilling C2.
As shown in FIG. 9, “intermediate drilling C2” refers to all drilling C2 other than the first drilling C1 and the corner drilling C1 in the drilling row among the continuous lap drilling C1 and C2 groups. means.
In addition, the first hole C1 and the hole C1 at the corner portion are required to have a positioning function of the steel sheet pile continuous wall, and the first hole C1 in the hole row has a larger diameter than the intermediate hole C2. Then, the first steel sheet pile P is staggered and driven backward in the construction traveling direction F, so that the adjacent hole C2 can be sufficiently held under the sufficient hole wrap Cw without danger of the hammer bit 6 coming into contact with the steel sheet pile section PE. Can be formed.

In 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 hole C1 is independently drilled before the front and rear holes C2. Thereby, the continuous lap drilling at the corner portion can be easily formed in a form sufficient for accommodating each steel sheet pile P.
Therefore, the continuous lap drilling C2 by the danza hole hammer drilling machine 1 having the section guide 5 is a continuous drilling of only the straight portion, and the work of engaging and disengaging the section guide 5 with the steel sheet pile section PE becomes easy, and The setting of the drilling lap Cw is also facilitated, the continuous lap drilling in the intermediate drilling C2 having a small drilling power can be accurately performed, and the operation cost can be reduced.

Further, as shown in FIG. 3, for example, a danza hole hammer suitable for carrying out the steel sheet pile continuous driving method of the present invention is a danza hole hammer 3 having a joint Jm at an upper end and a hammer bit 6 at a lower end. A small-diameter portion 32 is formed in a case 31 on the outer periphery of the danza hole main body 30, and the sleeve 4 is arranged on the outer periphery of the small-diameter portion 32 so as to be immovable up and down and slidably rotatable. A section guide 5 for sliding is fixed.
The cross-sectional shape of the section guide 5 may be such that the section guide pieces 5a and 5b are provided on both sides of the partition plate 44 as shown in FIG. 7C, or the holding plate as shown in FIGS. 8A and 8B. 8F, 51F and 52F may be arranged on the front surface of the section guide pieces on both sides, or as shown in FIG. 8C, one section U-shape may be used for both right and left section guides. I just want to be able to guide you.

In this case, the joint Jm typically has the same shape as the joint (not shown) at the upper end of the screw head at the tip of a conventional earth auger drilling machine.
Further, it is preferable that the small diameter portion 32 is formed in a form that does not interfere with the driving of the main body 30 (cylinder, hammer) of the conventional hammer 3 ′, and is formed at the lower portion of the case 31.
Since the case 31 is exposed to the exhaust flow of the high-pressure air for driving the hammer, the outer surface of the sleeve 4 is preferably substantially flush with the surface of the case 31 as shown in FIG.

  Therefore, the danza hole hammer 3 of the present invention is detached and replaced with the screw head of the auger when the soft surface layer reaches the hard formation such as hard rock while drilling the soft surface layer with a conventional earth auger screw according to the construction formation. Alternatively, after the first and corner holes C1 of the drilling row are drilled with a conventional danza hole hammer drilling machine, the conventional danza hole hammer 3 is formed when forming an intermediate continuous lap hole C2. ′ Alone can be used for the present invention, and the sleeve 4 having the section guide 5 is also arranged on the small diameter portion 32 of the case 31, so that the sleeve 4 protrudes from the outer periphery of the case 31. The penetration resistance of the sleeve 4 and the section guide 5 can be suppressed. Up drilling C2 can be drilled smoothly.

Further, in the present invention, 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 that two outer sleeves 43a and 43b having a semicircular cross section are detachably fitted and fixed on the inner sleeve 42.
The sleeve guide 41 and the inner sleeve 42 are arranged on the case small-diameter portion 32 by dividing the case 31 into a case upper portion 31 u and a case lower portion 31 d of a large-diameter portion and a small-diameter portion 32. After the sleeve 42 is disposed, the large-diameter portions 31u and 31d of the case and the small-diameter portion 32 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. Alternatively, the sleeve guide 41 and the inner sleeve 42 of the cylindrical split type may be arranged on the case small diameter portion 32.

Therefore, the vertical movement of the sleeve 4 holding the section guide 5 can be restricted by the upper and lower flanges f41 of the sleeve guide 41, and the section guide 5 can be smoothly guided on the vibrating case 31.
Since the outer sleeves 43a and 43b holding the section guides 5 are detachable from the inner sleeve 42, the outer sleeves 43a and 43b are advantageous for replacement of the section guides 5 which are severely worn. By replacing the outer sleeve with no section guide 5 as shown in FIG. 3 (C), it is possible to use it as a normal danza hole hammer 3 'which does not hold the section guide 5, so that an expensive danza hole hammer 3 can be used. The operation rate and the maintainability are improved.

  As shown in FIG. 4, the danza hole hammer 3 of the present invention has the inner sleeve 42 provided with a fitting portion a42 at an appropriate position on the outer peripheral surface, the split outer sleeves 43a and 43b provided on the inner peripheral surface, and the inner sleeve fitting portion a42. The outer sleeves 43a and 43b are bolted to the inner sleeve 42 in a state where 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 preferred to wear.

In this case, the shapes and arrangements of the fitting portions a42 and b43 are arbitrary, but the fitting of the fitting portions a42 and b43 is performed by 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 on the inner sleeve 42, thereby facilitating the assembly and maintenance of the danza hole hammer 3 including the section guide 5, and Due to the stress load on the fitting portions a42 and b43, the shear stress load on the fastening bolt can be reduced, and the durability of the bolt fastening means increases.

In the danza hole hammer 3 of the present invention, the section guide 5 detachably attaches the right section guide piece 5a and the left section guide piece 5b to the flat holding piece 44P of the holder 44 from both sides. It is preferable that the fixing piece 44C having the inner surface of the arc of the holder 44 be fixed to the outer periphery of the sleeve 4.
In this case, since the fixing piece 44C has the inner surface of the circular arc, the fixing to the outer periphery of the sleeve 4 can be firmly performed at an appropriate position by welding means or screwing means.

Also, the section guide pieces 5a and 5b can be easily attached and detached by tightening bolts to the flat holding pieces 44P, so that alignment and attachment / detachment operations are easy, and maintenance of the severely worn section guide 5 is facilitated. .
Moreover, since the section guide 5 can correspond to the left and right of the steel sheet pile section PE, the guide control of the danza hole hammer 3 by the steel sheet pile P can be accurately performed, and as shown in FIG. The small-diameter lap hole C2 can rationally form a row of lap holes necessary for continuous driving of steel sheet pile.

Further, as shown in FIG. 6, the cylindrical section guide used in the invention of the steel sheet pile continuous driving method according to the present invention has a central partition plate 80w and a central partition plate 80w on the outer surface of a flat plate-shaped fixing plate 81 having cylindrical pieces tu1 at both ends. Are arranged in a form in which a partition plate 80w has a protruding portion 80e having a bolt hole h80, and two semicircular cylindrical ring bodies 82 having cylindrical pieces tu2 and tu4 at both ends. The cylindrical piece tu2 at one end is connected to the cylindrical piece tu1 of the fixed plate 81 with the pin P8, and the cylindrical pieces tu3 and tu4 at the other end of the cylindrical ring body 82 are mutually connected. The pin can be locked by the pin P8 in a state of being loosely fitted in the cylindrical shape.
The center partition plate 80w, the section guide pieces 80 on both sides, and the fixed plate 81 may be cast and formed as an integrated product. The center partition plate 80w and the section guide pieces 80 on both sides may be integrally formed, and the fixed plate 81 May be fixed by welding or the like in a mounting form.

The projecting form of the projecting portion 80e of the center partition plate 80w may be made to project upward from the upper end level of the section guide piece 80 or to project upward and downward as shown in FIG. It suffices if a bolt hole h80 for the contact pressing bolt S can be arranged.
Accordingly, the cylindrical section guide 8 of the present invention can easily engage and disengage the section guide piece 80 with the steel sheet pile section PE because the section guide piece 80 is present on the fixed plate 81 in the form of a flat plate. Pressing and fixing the projecting portion 80e of the central partition plate 80w and the steel sheet pile section PE with the screw bolts S for preventing the vertical blind movement of the cylinder 8 can be easily performed. Is opened and closed at a wide angle about the center of rotation, and because the locking means is provided by inserting and removing the pin P8, the ground surface GL has an inner diameter similar to the outer diameter of the drill shaft 2 such as an auger screw. The operation of loosely closing and opening and releasing from the drilling shaft 2 is simple and easy.

  As shown in FIG. 6, the cylindrical section guide 8 has a tongue piece 82a in which the cylindrical ring body 82 is positioned at the upper and lower ends, protrudes horizontally and has a bolt hole h82, and has a smaller radius of curvature than the cylindrical ring body 82. In addition, the inner ring 83 in the form of a two-piece having a tongue piece 83a having a bolt hole h83 protruding horizontally at appropriate positions at the upper and lower ends is bolted to the inner surface of the cylindrical ring body 82 with the tongue piece 83a and the tongue piece 82a. It is preferable to fix by.

In this case, an inner ring body 83 having an inner diameter corresponding to the outer diameter of the various drilling shafts 2 is prepared, and the inner ring body 83 corresponding to the size of the drilling shaft 2 is selectively used and assembled to one cylindrical ring body 82. This allows the rational use of the cylindrical section guide 8.
And, by using the inner ring 83 that can replace the inner peripheral portion of the cylindrical section guide 8 that is subject to wear by the drilling shaft 2, the expensive cylindrical ring 82 having the section guide piece 80 can be used for a long time. Thus, rationalization of the operation and cost of the cylindrical section guide 8 can be achieved.

  Further, as shown in FIG. 5, the drilling shaft adapter 9 that can be suitably employed in the steel sheet pile continuous casting method invention of the present application has a joint pin hole hj and a female joint Jf at a lower end, and a joint pin hole hj and a male at an upper end. A sleeve 92 is attached to the outer periphery of a rod piece 90 having a joint Jm so as to be rotatable and immovable 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 the one that was attached.

  In this case, the female joint portion Jf at the lower end and the male joint portion Jm at the upper end can be pin-joined to the respective joint portions at the upper and lower ends of the conventional drilling shaft 2, so that the work of adding the drilling shaft 2 is simplified. It can be performed, and when the drilling shaft 2 is added, the section guide piece 94 is engaged with the steel sheet pile section PE. Therefore, the drilling machine added with the adapter includes the section guide 5 at the tip of the danza hole hammer 3, The drilling operation is performed under the guidance of the steel sheet pile section PE by the section guide piece 94 of the drilling shaft replenishing adapter 9 and the smooth lap drilling in which the bending deformation of the drilling shaft can be suppressed.

As shown in FIG. 5, the drilling shaft adapter has a sleeve 92 rotatably mounted on a cylindrical sleeve guide 91 fixed on a rod piece 90 with guide flanges f91 at upper and lower ends. In addition, the section guide piece 94 is attached so that the right and left section guide pieces 94a and 94b are detachably fixed to the holding pieces 93P of the holder 93 from both sides. Is preferred.
The sleeve guide 91 may be a half-cylinder in a two-part form welded and fixed on the rod piece 90, or may be an integral cylinder fitted and fixed on the rod piece 90. It suffices if it can be held freely 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 as the section guide 5 of the danza hole hammer 3 as well, the danza hole hammer 3 and the joint (adapter 9) of the drill shaft 2 are formed. In this way, accurate position guidance with respect to the steel sheet pile section PE can be achieved, and the danza hole hammer drilling machine 1 can be properly adjusted for right and left use of the steel sheet pile P under a smooth guide that does not bend over the vertical direction. A predetermined row of deviated lap drilling holes C2 can be formed, and a small diameter drilling hole C2 that can be drilled with a small drilling power makes it possible to cleanly form a row of lap drilling holes C2 for continuous driving of steel sheet pile.
In addition, the attachment and detachment of the section guide piece 94, which is severely worn, can be easily replaced, and the maintenance of the adapter 9, that is, the maintenance of the danza hole hammer drilling machine 1 can be rationalized.

The drilling shaft adapter 9 has a flat holding piece 93P at the tip of the holder 93 in which a plurality of bolt holes h93 are vertically provided, and a fixing piece 93C having an arc inner surface. It is preferable that the section guide pieces 94a and 94b are fixed to the outer peripheral surface of the sleeve 92 and are removably bolted through the bolt holes h93 of the holding pieces 93P.
In this case, since the holder fixing piece 93C has the inner surface of the circular arc, welding to the outer peripheral surface of the sleeve 92 or fixing with a bolt or the like can be reliably and easily performed.
Also, the section guide pieces 94a and 94b have to be replaced because they are severely worn. 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 needed. It becomes.

  In the steel sheet pile continuous casting method of the present application, by selecting the diameter of the hammer bit 6 and the projecting length of the section guide 5, the steel sheet pile is continuously connected to the hard rock formation GH under the appropriately set drilling lap Cw. Since the lap drill C2 row can be formed and the danza hole hammer 3 is driven under the guidance of the existing steel sheet pile P, not only a large leader type danza hole hammer drill but also a small leaderless danza hole hammer drill. Continuous lap drilling in the hard rock formation GH by the drilling machine is possible, and a continuous lap drilling row corresponding to the steel sheet pile P to be continuously cast can be formed. Driving is possible with a conventional vibro pile driving machine, and the formation of a continuous wall for retaining the hard rock formation GH and the excavation and excavation along the continuous retaining wall can be performed safely and with epoch-making efficiency. Can be implemented in construction cost Significant reduction of it is possible.

  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 danza hole hammer 3 enters deep into the ground, the section guide 5 at the tip of the danza hole hammer and the ground by the cylindrical section guide 8 can be used. Since the drilling is a guide drilling above and below the guide of the drilling shaft 2 with the GL position, it is possible to properly control the posture of the danza hole hammer drilling machine that performs vertical vibration drilling and smoothly perform continuous lap drilling. As a result, the wear of the members, particularly the wear of the section guide 5 fixed to the danza hole hammer, can be suppressed.

In addition, the danza hole hammer 3 used in the steel sheet pile continuous casting method according to the present application, when reaching the hard rock stratum while drilling the soft surface layer with a conventional earth auger screw according to the construction stratum, When drilling by attaching and detaching and replacing, the drilling C1 at the beginning and the corner of the drilling row is drilled with a conventional Danza hole hammer drilling machine, and then only the Danza hole hammer is used during continuous lap drilling C2. Operability is good because it can be used by detachable replacement.
Also, the sleeve 4 having the section guide 5 can 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 continuous lap drilling C2 can be smoothly drilled under engagement sliding by the steel sheet pile section PE.

  Further, in the cylindrical section guide 8 used in the steel sheet pile continuous casting method of the present application, since the section guide piece 80 exists on the fixed plate 81 in the form of a flat plate, the engagement and disengagement work of the section guide piece 80 with the steel sheet pile section PE can be performed. It is easy to press and fasten the projecting portion 80e of the center partition plate 80w and the steel sheet pile section PE by screw bolts for preventing the vertical blind movement of the cylindrical section guide 8, and each cylindrical ring body 82 also Since the locking plate 81 is opened and closed at a wide angle around both ends of the fixed plate 81 as a center of rotation and is a locking means by inserting and detaching the pin P8, the inner diameter is approximately the same as the outer diameter of the drilling shaft 2 such as an auger screw. Nevertheless, the operation of closing and loosening the loose fitting to the drilling shaft 2 on the ground GL and the operation of opening and disengaging are easy and easy.

  In addition, the adapter 9 for drilling shaft extension used in the steel sheet pile continuous casting method of the present application includes 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. With the pin joint, the refilling operation of the drilling shaft 2 can be performed easily and easily, and when the drilling shaft 2 is replenished, the section guide piece 94 is engaged with the steel sheet pile section PE. In the drilling machine 1 added by the drilling operation, the drilling operation is performed under the guidance in the steel sheet pile section PE by the section guide 5 at the tip of the danza hole and the section guide piece 94 of the drilling shaft extension adapter 9. Smooth lap drilling with suppressed deflection of the shaft is possible.

[Danza Hall Hammer (Figs. 3 and 4)]
The hammer 3 of the present invention (FIG. 3) includes a general commercially available danza hole main body 30 and an outer case (danza hole) 31. The high-pressure air passing through the swivel part of the auger is supplied from the upper male joint part Jm through the inside of the auger screw, and drives a cylinder (not shown) in the danza hole main body 30 to vertically move the hammer bit 6. It occurs and crushes rocks, and its internal structure and impact crushing action are the same as those of a conventional danzahole hammer 3 'shown in FIG. 10 (C).

That is, the present invention hammer 3 is different from the conventional hammer 3 'in that the sleeve 4 having the section guide 5 attached to the case 31 is arranged.
As the case 31, a commercially available steel pipe having an outer diameter of 508mm and a thickness of 16mm is cut into a desired length, and a case upper portion 31u and a case lower portion 31d are prepared. A separately prepared case small diameter portion having an outer diameter of 355.6mm and a thickness of 15mm is prepared. As shown in FIG. 4 (A), the upper case 31u (standard length: 1500 mm), the small-diameter portion 32 (standard length: 500 mm), and the lower case 31d (standard length: 300 mm) are welded to each other. ) Is prepared.

  Further, sleeve guides 41a and 41b each having a half-cylindrical shape obtained by dividing a cast cylinder having a thickness of 20 mm and having a flange f41 at the top and bottom into two parts are fitted into the case small diameter portion 32, and as shown in FIG. A joint line between 41a and 41b and a joint line between the flange f41 and the case upper portion 31u and the case lower portion 31d are defined as a welding line Lm, and the outer periphery of the flange f41 is flush with the case upper portion 31u and the case lower portion 31d. 32.

Next, the inner sleeves 42a and 42b each having a thickness of 26 mm and having the fitting protrusion a42 of a square plane arranged on the outer peripheral surface in the form of a cylinder in two parts are placed on the sleeve guide 41 as shown in FIG. The inner sleeve 42 is arranged integrally with the welding line Lm so as to be slidable and rotatable and the vertical movement is restricted by the flange f41.
Next, outer sleeves 43a and 43b each having a cylindrical thickness of 28 mm and having a fitting concave portion b43 on the inner surface corresponding to the fitting convex portion a42 of the inner sleeve 42 are fitted on the inner sleeve 42. The concave portion b43 is fitted to the fitting convex portion a42, and the bolt is fastened via the bolt hole h43 and the bolt hole h42.
As shown in FIG. 4A, a holder 44 composed of a fixing piece 44C having an inner surface of a circular arc and a flat plate-like holding piece 44P in which a group of bolt holes h44 is vertically provided, on one of the outer sleeves 43a and 43b. Is fixed by welding as shown in FIG.

Next, the case 31 in which the sleeve 4 is disposed on the case small diameter portion 32 so as to be rotatable and immovable up and down is replaced with a case of a conventional (commercially available) danza hole hammer (FIG. 10 (C)) and mounting pins are replaced. It is fixed at P3 to form the present danza hole hammer.
Then, as shown in FIG. 3 (C), a right section guide piece 5a and a left section guide piece 5b having an engagement groove 5G and a bolt hole h5 are prepared, and the sleeve 4 is used when the danza hole hammer 3 is used. 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 instead of the welding integration shown in FIG. 4. In this case, the holder 44 projecting from the outer surface of the case 31 may be used. Since the section guide pieces 5a and 5b are fixed when used, maintenance and management of the danza hole hammer 3 can be rationalized.

[Cylinder section guide (Fig. 6)]
As shown in FIG. 1B, the cylindrical section guide 8 is mounted on the ground GL to guide the drilling shaft 2 at the ground position during the drilling operation of the danza hole hammer drilling machine 1. As shown in FIG. 6A, the inner diameter D8 of the cylinder is made slightly larger (standard: 10 mm) than the outer diameter D2 of the drilling shaft 2 (FIG. 1).
FIG. 6A is a plan view of the fitted and closed form of the cylindrical section guide 8, FIG. 6B is an exploded plan view, FIG. 6C is an open plan view, and FIG. D) is an exploded perspective view of the cylindrical ring body 82.
As shown in FIG. 6 (B), the cylindrical section guide 8 has a semi-cylindrical shape on both sides, which is rotatably pin-locked to both ends of a flat fixing plate 81 having section guide pieces 80 by connecting pins P8. , And a semi-cylindrical inner ring 83 disposed on the inner peripheral portion of each cylindrical ring 82.

  As shown in FIG. 6 (D), each of the cylindrical rings 82 has a cylindrical piece tu2 at one end fixed to the fixing plate 81 and a vertical piece tu2 with an interval St. 82 is provided with a cylindrical piece tu3 up and down while maintaining the interval St, and a cylindrical piece tu4 having a height Lt at which the other cylindrical ring body 82 can be fitted into the interval St at the center, and a bolt hole h82 is formed from the upper end edge. The tongue piece 82a provided has a height of about 40 cm with a structure protruding outward, and the inner diameter D8 in a state of being closed in a cylindrical shape is a dangling hole having a diameter of 584 mm even when the inner ring body 83 having a thickness of 16 mm is closely arranged. 560 mm (D8) in order to loosely fit the auger screw diameter of the hammer of 550 mm.

The fixing plate 81 is a steel plate having a thickness of 10 mm, a width of 100 mm, and a height equal to the cylindrical ring body 82 (40 cm). In the center of both side edges, the interval St between the cylindrical pieces tu2 of the cylindrical ring body 82 is set. 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 configuration in which a partition plate 80w protrudes forward at the center, and engagement grooves 8G are provided on both sides. It is integrally cast in a protruding form, a bolt hole h80 is provided in the protruding portion 80e of the partition plate 80w, and is integrated with the outer surface of the fixing plate 81 by welding.
The cylindrical piece tu1 at the center of both sides of the fixed plate 81 and the cylindrical piece tu2 above and below the end of each cylindrical ring body 82 can be opened and closed around the fixed plate 81 by inserting and locking the connecting pin P8. The ring body 82 is constituted.

The inner race 83 protects the inner peripheral surface of the cylindrical race 82 from wear and tear, and also exchanges for changes in the outer diameter of the drilling shaft 2, thereby providing an expensive cylinder with a section guide piece 80. A replaceable two-piece 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 arranged to protrude, and the tongue piece 83a is removably bolted to the tongue piece 82a of the cylindrical ring body 82.
Then, several kinds of inner rings 83 having different curvature radii are prepared for one kind of cylindrical rings 82, and are replaced with different inner diameters in accordance with changes in the outer diameter of the drilling shaft 2. Since the auger screw 2 is replaced by abrasion of the inner peripheral surface, the auger screw 2 is made of a mild steel pipe which does not wear.

  Accordingly, the cylindrical section guide 8 in which the inner race 83 is attached to the inner periphery of the cylindrical race 82 as shown in FIG. 6C is closed in an annular shape as shown in FIG. The connecting pin P8 can be inserted into the cylindrical pieces tu3 and tu4 of the outer wall and locked, and the section guide piece 80 is engaged with the steel sheet pile section PE even during the operation of the danza hole hammer drilling machine, so that the cylindrical ring body 82 is formed. The cylindrical section guide 8 is fitted and closed to the drilling shaft 2 at the ground GL position and the bolt S is screwed into the steel sheet pile section PE from the bolt hole h80 of the partition plate projection 80e, so that the cylindrical section guide 8 moves up and down at the ground GL position. The guide function of the drilling shaft 2 can be achieved without blind movement.

[Adapter for drilling shaft (Fig. 5)]
FIG. 5 (A) is an exploded perspective view of the drilling shaft adapter 9, FIG. 9 (B) is an assembled perspective view, and FIG. 5 (C) is a completed perspective view of the adapter.
As is clear from FIG. 9 (C), the adapter 9 of the present invention includes a male joint Jm at the upper end of the rod piece 90 and a female joint Jf at the lower end, similarly to a conventional drilling shaft adapter (not shown). A half-split sleeve guide 91a, 91b provided with upper and lower flanges f91 is fitted on the outer periphery of the rod piece 90 and welded and integrated with the rod piece 90, and a half-split sleeve 92a is placed on the sleeve guide 91. , 92b are fitted together to form a sleeve 92 that can be slid and rotated on the sleeve guide 91 and cannot be moved up and down by the flange f91, as shown in FIG. A holder 93 including a fixing piece 93C having an inner surface of an arc and a plate-like holding piece 93P having a bolt hole h93 vertically provided is fixed to a sleeve 92 by welding or screws.
Also, 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. The pieces 94a and 94b are bolted to the holder 93.

In this case, in a state where the engagement grooves 94G of the section guide pieces 94a and 94b fastened to the holder 93 are engaged with the steel sheet pile section PE, the side of the holder 93 so that the outer periphery of the danza hole hammer does not contact the steel sheet pile section PE. Determine the overhang dimension.
Further, the height L93 of the holder 93 is formed to be about twice the height L93C of the fixing piece 93C, so that the sleeve guide 91 and the sleeve 92 are arranged under the condition that the length of the rod piece 90 is reduced, and In addition, it is possible to employ section guide pieces 94a and 94b in which the fitting groove 94G has a sufficient length for smooth guiding, which is advantageous as the adapter 9 in the middle of the drilling shaft 2 which is easily displaced.

[Construction (Figs. 1, 9)]
In the hard rock formation GH, the first drilling C1 is independently drilled by a conventional danza hole hammer drilling machine (FIG. 10).
In this case, both the leader type danza hole hammer drilling machine and the leaderless danza hole hammer drilling machine can perform drilling because they are independent drilling.
Then, as shown in FIG. 2, a leaderless danza hole hammer drilling machine 1 having a section guide 5 mounted on a danza hole case is used to strike the section guide 5 into the first hole C1 as shown in FIG. The drilling operation is performed in a state where the hole is engaged with the section PE of the piled steel sheet pile P, and as shown in FIG. 1 (B), the temporary drilling operation is stopped when the danza hole hammer 3 enters the ground and is buried. The guide 8 is mounted on the ground GL by engaging the engagement groove 8G of the section guide piece 80 shown in FIG. 6 from the upper end of the steel sheet pile section PE, and mounting the cylindrical ring 82 on the auger screw (drilling shaft) 2. It is loosely fitted to the outer diameter and closed, and the connecting pin P8 is inserted and locked in 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 projection 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.

Then, as shown in FIG. 1 (C), when it is necessary to add the second drilling shaft 2 to the first drilling shaft 2 provided with the danza hole hammer 3, the drilling operation of the drilling machine 1 is performed. Is temporarily stopped, the cylindrical section guide 8 is opened, and the steel sheet pile section PE is pulled out, 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 to the steel sheet pile section PE. At the stage where the upper and lower joints Jm and Jf connect the upper and lower drilling shafts 2, the danza hole hammer drilling machine 1 is restarted, and the adapter 9 with section guide is buried in the ground. If necessary, the cylindrical section guide 8 is again loosely fitted on the outer periphery of the drilling shaft 2 on the ground GL to form a lap drilling hole C2 having a drilling wrap Cw to a predetermined depth, and then the drilling machine 1 is raised and removed. And then Figure 1 ( ) 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.
The above steps are repeated to continuously drive steel sheet piles into the continuous lap hole C2.

  As shown in FIG. 9 (A), the continuous lap drilling row is formed by a steel sheet pile P in the construction progressing direction F. The section guide 5 of the 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 shifted from the steel sheet pile meshing center line OO. d1 Similarly, in the steel sheet pile drilling hole C2 which is shifted rightward and protrudes leftward in the traveling direction F, the hammer bit center point is positioned below the engagement of the left section guide piece 5b with the steel sheet pile section PE. Oc is drilled by shifting d1 to the left from the steel sheet pile meshing center line OO by d1.

In this case, as shown in FIG. 7 (B), 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 drills the hole in a dimension that falls down in the already drilled hole. Since the drilling wrap Cw can be formed in C1 and C2, and since each drilling C2 is displaced in the projecting direction of the flat plate portion PF of the steel sheet pile, even if the drilling C2 row has a relatively small diameter, Each of the steel sheet piles P can be completely and continuously driven in the second row of the drilling holes C, and the continuous driving of the steel sheet piles by the small-diameter drilling C2 row which consumes less drilling energy can be achieved.
Accordingly, as shown in FIG. 9 (B), the first drilling C1 and the corner drilling C1 using the conventional danza hole hammer that defines the reference positions of the drilling C1 and C2 rows and performs independent drilling are performed. By performing the continuous lap drilling C2 with a required minimum diameter by the danza hole hammer 3 having the section guide 5 with a large diameter, the construction cost can be reduced.

Further, even during the lap drilling operation with the danza hole hammer provided with the section guide 5, the guide control of the drilling shaft 2 by the cylindrical section guide 8 at the ground GL position and the section guide at the drilling shaft 2 replenishment position. The guide control of the drilling shaft 2 by the attached adapter 9 can suppress the generation of the bending of the long drilling shaft 2, so that the vibration drilling work of the danza hole hammer 3 can be smoothly guided and the drilling shaft 2 is also smooth. In this case, the drilling can be guided, and the wear caused by the lateral deflection of the drilling machine 1 can be suppressed.
If the reduction and rationalization of power consumption for drilling is ignored, both the first drilling C1 and the continuous lap drilling C2 can be performed with the same drilling diameter.

In the danza hole hammer 3 shown in FIGS. 3 and 4, the sleeve 4 has a structure in which the outer sleeve 43 is bolted onto the inner sleeve 42, so that the holder 44 is attached to the two outer sleeves 43a and 43b. By replacing the outer sleeve 43a with the outer sleeve 43b without a holder, the section guide 5 can be removed as shown in FIG.
Therefore, the danza hole hammer 3 of the present embodiment can be replaced with the danza hole hammer 3 ′ for ordinary single drilling, which cannot perform lap drilling, by replacing the outer sleeve. In addition, they can be used freely, and the cost of machinery and equipment can be rationalized, and the maintenance can be rationalized.

[Others]
In the cylindrical section guide 8 shown in FIG. 6, the tongue piece 82a and the tongue piece 83a of the cylindrical ring body 82 and the inner ring body 83 can be provided at the upper edge and the lower edge. Instead of the bolt hole h80 of the projection 80e, a bolt hole (not shown) is opened 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. Even so, the initial objectives can be achieved.
Further, if the bolt fastening means between the section guide piece 80 and the steel sheet pile section PE is two-point fastening, that is, above and below the section guide piece 80, the cylindrical section guide 8 can be more reliably held.

Also, as shown in FIG. 8A, the section guide 5 of the danza hole hammer 3 may be in the form of 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. 8B. As shown in FIG. 8 (C), it is also possible to engage and hold the section from the section PE of the steel sheet pile P to the inclined plate portion PS. The engagement groove 53 </ b> G may be a type that performs the function of each of the left and right engagement grooves.
In addition, it is advantageous to suppress the wear of the case 31 by vertically arranging steel rods having a short cross section at regular intervals on the outer periphery of the case upper portion 31u and the case lower portion 31d of the danza hole hammer 3.
The engagement grooves of the section guide pieces 94 of the adapter 9 with section guides and the section guide pieces 80 of the cylindrical section guide 8 are the same as the engagement grooves 5G, 51G, 52G, 53G of the section guide 5 of the danza hole hammer 3. Or a different form.

It is a construction explanatory view of the present invention, (A) shows a lap drilling start state, (B) shows a cylindrical section guide arrangement state, (C) shows an adapter with a section guide attached state, and (D) shows a lap drilling state. It is a figure which shows the steel sheet pile driving state in a hole. It is explanatory drawing of a danza hole hammer drilling machine, (A) is a figure which shows the state which mounted the danza hole hammer for lap drilling, (B) is a figure which shows the conventional danza hole hammer for exchange. It is an explanatory view of a danza hole hammer of the present invention, (A) is an assembled state, (B) is an exploded state, (C) is a figure assembled for a conventional danza hole hammer. It is explanatory drawing of this invention danza hole hammer, (A) is an exploded perspective view, (B) is a perspective view which assembled the sleeve guide, and (C) is a perspective view which assembled the inner sleeve. It is explanatory drawing of the adapter with a section guide of this invention, (A) is an exploded perspective view, (B) is a perspective view before fastening of a section guide piece, (C) is an assembly completion perspective view. It is explanatory drawing of a cylindrical section guide of this invention, (A) is an assembly state top view, (B) is an exploded state top view, (C) is a junction state top view of a cylindrical ring body and an inner ring body, (D) It is an exploded perspective view of a cylindrical ring. It is an explanatory view of a danza hole hammer of the present invention, (A) is a side view of an engagement state with a steel sheet pile section, (B) is a BB sectional view of (A), (C) is C of (A). FIG. 4 is a cross-sectional view taken along line C. It is an action explanatory view of a section guide, (A) shows a 1st modification, (B) shows a 2nd modification, (C) shows a 3rd modification, (D) differs from a 3rd modification. It is a top view which shows an action form. It is an explanatory view of driving a steel sheet pile into a drilling row, (A) is a figure showing a straight line part, and (B) is a figure showing a corner part. It is explanatory drawing of the prior art example 1, (A) is a construction process explanatory front view, (B) is a top view, (C) is a conventional danza hole hammer side view. It is explanatory drawing of the prior art example 2, (A) is a schematic side view, (B) is a partial enlarged top view.

Explanation of reference numerals

1 drilling machine (danza hole hammer drilling machine)
2 drilling shaft (auger screw)
3,3 'Danzahole hammer 4,92,92a, 92b Sleeve 5,51,52,53 Section guide 5a Section guide piece for right (section guide piece)
5b Left section guide piece (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, joint)
10 Vibro pile driver (pile driver)
Reference Signs List 30 Danza hall body 31 Case 31u Upper case 31d Lower case 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 Partition plate (holder)
44C, 93C Fixing piece 44P, 93P Holding piece 51F, 52F Holding plate 80 Section guide piece 80e Projecting portion 80w Partition plate 81 Fixing 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 (Joint)
Jf female joint (joint)
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 lap drilling (intermediate drilling, drilling)
Cw drilling lap JP1, JP2, JP3 Mounting pin part P Steel sheet pile PE section PF Flat 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 (C1) formed by a conventional drilling machine (1) equipped with a danza hole hammer (3 ') at the tip, and then the tip portion The section guide (5) is engaged with the steel sheet pile section (PE) by a drilling machine (1) equipped with a danza hole hammer (3) in which a section guide (5) is arranged. A continuous lap drilling (C2) having a drilling wrap (Cw) in a drilled hole (C1) is formed by hitting and drilling to a predetermined depth under the guidance of a steel sheet pile (P). The machine (1) is lifted and removed, and the section (PE) of the adjacent sheet pile (P) is engaged with the section (PE) of the driven sheet pile (P) to continuously pierce the steel sheet pile (P). Steel sheet piles are continuously driven into hard rock formations.   A steel sheet pile (P) is driven into a hard rock formation (GH) into a drilling (C1) formed by a conventional drilling machine (1) equipped with a danza hole hammer (3 ') at the tip, and then the tip portion The section guide (5) is engaged with the steel sheet pile section (PE) by a drilling machine (1) equipped with a danza hole hammer (3) in which a section guide (5) is arranged. The hole is hit and drilled under the guidance of the steel sheet pile (P), and when the danza hole hammer (3) is buried in the ground, the cylindrical section guide (8) is loosely fitted on the outer periphery of the drilling shaft (2). Placed on the ground (GL), the boring machine is hit by a section guide (5) at the tip of a danza hole hammer and a cylindrical section guide (8) on the ground to strike and drill to a predetermined depth to perform drilling. Hole (C1) has drilling wrap (Cw) A continuous lap drilling (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). A method of continuously driving steel sheet piles into hard rock formations by driving steel sheet piles (P) into continuous lap holes (C2).   The cylindrical section guide (8) is a two-part openable / closable cylindrical ring body (82) provided with a section guide piece (80), and the guide piece (80) is fitted to a section (PE) of a driven sheet pile. 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 drilling shaft (2) and placed on the ground to guide the drilling shaft (2). 3. A method for continuously driving steel sheet piles 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 into the steel sheet pile by using the adapter (9) with a section guide piece. 3. The method according to claim 1, wherein the drilling shafts (2) are connected to each other by engaging with the sections (PE).   The section guide (5) of the danza hole hammer (3) includes a right section guide piece (5a) and a left section guide piece (5b), and is connected 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 from the steel sheet pile meshing center line (OO) to the right by a distance (d1), and the left section guide piece (5b) is moved 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 the distance (d1) to the left from the steel sheet pile meshing center line (OO). Continuous casting method.   6. Each of the steel sheet piles (P) is driven into the corresponding hole (C <b> 1, C <b> 2) while being shifted rearward in the traveling direction (F) with respect to each corresponding hole (C <b> 1, C <b> 2). 7. The continuous sheet pile driving method according to any one of the above items.   The first drilling (C1) and the corner drilling (C1) are performed by a drilling machine (1) equipped with a conventional danza hole hammer (3 ') and have a larger diameter than the intermediate drilling (C2). The method of continuously casting steel sheet piles according to claim 1, wherein the steel sheet piles are perforated.   A hammer (3) having a joint (Jm) at an upper end and a hammer bit (6) at a lower end, wherein a small-diameter portion (32) is formed in a case (31) on an outer periphery of a main body (30) of a danza hole. A sleeve (4) is arranged on the outer periphery of the small-diameter portion (32) so as not to be able to move up and down and to be slidable and rotatable, and the sleeve (4) is provided with a section guide ( 5) A danza hole hammer for continuous lap drilling, which is used for a method of continuously driving steel sheet pile into a hard rock formation, to which 5) is fixed.   A sleeve guide (41) having 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). 9. The hammer according to claim 8, wherein the outer sleeve (43a, 43b) having a semicircular cross section is detachably fitted and fixed 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 two-piece 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 each outer sleeve (43a, 43b) is connected to the inner sleeve (42) in a state where the fitting portion (b43) of the divided outer sleeves (43a, 43b) is fitted to the fitting portion (a42) of the inner sleeve. 10.) The hammer according to claim 9, wherein the hammer is bolted to the hammer.   The section guide (5) is configured such that the right section guide piece (5a) and the left section guide piece (5b) are removably fastened to the flat holding piece (44P) of the holder (44) from both sides. The danza hole hammer according to any one of claims 8 to 10, wherein the fixing piece (44C) having the inner surface of the arc of (44) is fixed to the outer periphery of the sleeve (4).   On the outer surface of a flat plate-shaped fixing plate (81) having cylindrical pieces (tu1) at both ends, a central partition plate (80w), section guide pieces (80) on both sides, and a partition plate (80w) having bolt holes. (H80), two semicircular cylindrical ring bodies (82) having cylindrical pieces (tu2, tu4) at both ends, each having a cylindrical piece at one end. (Tu2) and the pin (P8) are connected to the cylindrical piece (tu1) of the fixing plate (81), and the cylindrical pieces (tu3, tu4) at the other ends of the cylindrical ring body (82) are mutually connected to each other. ) Is a cylindrical section guide used for a method of continuously driving steel sheet piles into a hard rock stratum, in which a pin (P8) can be pin-locked in a state where the outer periphery of a drilling shaft (2) is loosely fitted in a cylindrical form.   The cylindrical ring body (82) has a tongue piece (82a) protruding horizontally and having a bolt hole (h82) at appropriate positions at the upper and lower ends. The radius of curvature is smaller than that of the cylindrical ring body (82). A tongue piece (83a) and a tongue piece (82a) having a tongue piece (83a) having a tongue piece (83a) having a bolt hole (h83) protruding horizontally are provided on the inner surface of the cylindrical ring body (82). 13. The cylindrical section guide according to claim 12, wherein the cylindrical section guide is fastened by bolting with the above.   A sleeve (92) is wound around the outer periphery of a rod piece (90) having a joint pin hole (hj) and a female joint (Jf) at the lower end and a joint pin hole (hj) and a male joint (Jm) at the upper end. A steel for hard rock formation, which is mounted to be movable and immovable up and down, a holder (93) is fixed on a sleeve (92), and a section guide piece (94) is detachably mounted on the holder (93). Adapter for drilling shaft used in continuous sheet pile driving method.   The sleeve (92) has a guide flange (f91) at the upper end and the lower end, and is rotatably and flanged on a cylindrical sleeve guide (91) fixed on a rod piece (90). The section guide piece (94) is detachable from both sides of the section guide piece (94) with the right section guide piece (94a) and the left section guide piece (94b) attached to the holding piece (93P) of the holder (93). The adapter for a drilling shaft according to claim 14, wherein the adapter is fixed to the hole.   The holder (93) has a flat holding piece (93P) having a plurality of bolt holes (h93) vertically arranged vertically and a fixing piece (93C) having an inner surface of an arc, and the fixing piece (93C) is provided. 16. The drilling shaft according to claim 14, wherein the section guide piece (94a, 94b) is detachably bolted to the outer peripheral surface of the sleeve (92) through a bolt hole (h93) of the holding piece (93P). Adapter.

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