JP2004225532A - Steel sheet pile driving method and auger drilling pile driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly carry out a continuous driving of a steel sheet pile into a soft rock layer, lap drilling by an auger screw and steel sheet pile driving with a low energy consumption. <P>SOLUTION: A vibrating auger machine 1 wherein a rotary work and a vibrating work are simultaneously operated by separate driving systems is used. A section guide 4 is attached to an auger screw 2. An auger work executes lap drilling C2 under an engagement guide of a section guide 4 with a driven-finished steel sheet pile PE. In a case a progress of the drilling by the auger screw is hindered by a rolling stone or the like, a vertical vibrating action is added to the auger screw 2 in the rotary action so that the drilling proceeding by the auger screw 2 is encouraged. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a method for driving steel sheet piles into a stratum, such as a soft rock or a hardly tightened layer, which is difficult to drive with a normal level of vibration and to drive steel sheet piles uniformly and uniformly, and to a construction machine. A lap hole is formed, and a steel sheet pile is driven into the lap hole by vibration, and belongs to the technical field of civil engineering foundation work.

  In order to continuously drive steel sheet pile into the stratum of soft rock, etc., it is necessary to form drilling for driving steel sheet pile in advance.Continuous lap drilling, that is, vertical hole drilled with auger screw, It is necessary to form a vertical hole with a partially overlapping (overlapping) side surface, and drill each hole into a continuous shape while partially overlapping. However, drilling with a leaderless auger drilling machine is required. In the hole, even if the drilling work is performed so that the next drilled hole overlaps the already drilled hole, since the auger screw is held at the upper end only, Therefore, it slipped toward the pre-drilled hole with low resistance, and the desired lap drilling was impossible.

Therefore, in order to carry out continuous lap drilling using one earth auger screw, a large machine equipped with a leader that guides the advancement of the auger screw into the ground so that it does not slip toward the drilled hole, A leader type auger machine called a three-point auger machine is used.
However, even in the leader type auger machine, the leader is erected on the ground, the auger guide at the upper end of the auger screw is guided and slid by the leader, and the auger screw is guided by the screw guide arranged at the lower end of the leader, that is, In order to guide the auger screw at two points, the auger guide which descends with the auger screw on the leader and the screw guide at the lower end of the leader, the screw head traveling underground has a drilled hole side with less drilling resistance Tends to occur.
The tendency of the screw head to shift in the lateral direction (the direction of the drilled hole) increases as the screw head advances, that is, as the distance from the screw guide increases, and between the auger guide and the screw guide. The smaller the distance, the easier it is to slip, and the harder the stratum, the easier it is to slip.

The present applicant has proposed a conventional example 1 shown in FIG. 8 as a continuous lap drilling method using a leaderless auger machine.
Conventional example 1 is disclosed in Patent Literature 1, in which a plurality of cylindrical auger screw guides are arranged for half-hole a1 to a4 in one half of a frame-shaped guide ruler having a fixed pile. In the other half, a plurality of cylindrical casing guides are arranged for driving the casing, the ruler is arranged and fixed, and a plurality of spaced holes a1 to a4 are drilled. Are rearranged in the form located in the middle of the interval drilling a1 to a4, then drilling the drilling casing for the auger screw guide, and then lap drilling in the drilled drilling casing with the auger screw. Things.
The steel sheet pile driving operation is performed by replacing the auger working machine with a pile driving machine (vibro).

  Further, FIG. 9 is cited as Patent Document 2, in which a hole for driving steel sheet pile is continuously formed in an auger screw hole, and as shown in FIG. The guide device arranged in the abutment is guided in contact with the end of the driven steel sheet pile, and together with the guidance by the leader at the auger base end, as shown in FIG. It is formed continuously, and steel piles are continuously driven by a separate pile driver.

FIG. 10 is cited as Patent Literature 3, in which lap drilling is not possible, but drilling and driving of steel sheet pile are performed simultaneously.
That is, a steel sheet pile is driven into an earth auger driving device by a vibrator arranged so that vibration is not propagated via a spring buffer mechanism and a hydraulic cylinder for press-fitting. The operation, the vibration driving of the steel sheet pile by the exciter and the hydraulic cylinder for press-fitting the steel sheet pile are performed simultaneously.

Japanese Patent No. 3233613 (Japanese Patent Laid-Open No. 2000-319889) JP 2001-55882 A JP-B-53-16602

In the conventional example 1 (Patent Literature 1) shown in FIG. 8, the continuous lap drilling is performed by the auger screw in the drilling casing in which the drilling is performed between the interval drilling a1 to a4. The auger screw, even in the ground, becomes a complete guide over the entire length, and a continuous lap drilling as specified is obtained, far more than a conventional leader type auger machine or continuous lap drilling with a leaderless auger machine. High quality continuous lap drilling is obtained, but the arrangement for the ruler spacing drilling, the reverse relocation for guiding the ruler drilling casing, the driving of the drilling casing, and the continuous auger screw into the driving casing There are many man-hours and complicated work including positioning of a ruler such as lap drilling, and there is a problem in workability.
Moreover, the steel sheet pile driving work is performed by replacing the auger machine with a vibrator (vibrator) or by using a separate pile driving machine.

Further, in Conventional Example 2 (Patent Document 2) shown in FIG. 9, drilling holes for driving a steel sheet pile can be formed adjacent to each other. However, since each of the drilling holes is not a lapping hole, a large energy is required for driving the steel sheet pile. Need.
That is, in a hard stratum where a steel sheet pile is driven after drilling, even if each drilling is a uniform continuous drilling, each drilling has considerable drilling wrap, Unless the area around the driving position of the section is softened by lapping (overlapping) drilling, it is difficult to smoothly and continuously drive steel sheet piles.
Moreover, the steel sheet pile driving work is performed by replacing a separate pile driving machine or auger machine with a vibro.

  Further, in Conventional Example 3 (Patent Document 3) shown in FIG. 10, drilling and driving of a steel sheet pile can be simultaneously performed by one working machine. Therefore, most of the steel sheet pile is near the drill hole, but it is driven outside the drill hole, requiring large driving energy, is possible only with large machines, and requires a large driving stress. .

  The present invention requires the use of a new vibratory auger machine that can freely apply rotation and vibration to the same output shaft for driving steel sheet pile into a soft rock formation, making it necessary for the earth auger screw during drilling. Vibration can be applied accordingly, drilling by auger screw and driving steel sheet pile by vibration can be performed smoothly with low power consumption. Even if it is a leaderless machine, it provides an epoch-making method that enables more efficient and more uniform steel sheet pile driving than conventional leader-type large machines.

  In the invention of the steel sheet pile driving method of the present invention, for example, as shown in FIG. 4A, a single hole C1 is formed by a vibrating auger machine 1 in which an auger screw 2 is connected to an output shaft 14b, and then, as shown in FIG. As described above, the steel sheet pile P is vibrated into the drilled hole C1 by the vibrating auger machine 1 having the chuck 5 for gripping the steel sheet pile connected to the output shaft 14b, and then the auger screw 2 having the section guide 4 is attached to the output shaft 14b. As shown in FIG. 5A, the section guide 4 of the auger screw 2 is engaged with the section PE of the existing steel sheet pile P by the connected vibrating auger machine 1, and the auger screw 2 is connected to the section PE of the existing steel sheet pile. A lap hole C2 is formed to a predetermined depth under the guide, and after the auger screw 2 is lifted and removed, the vibratory auger machine 1 in which the chuck 5 is connected to the output shaft 14b is used. As shown in B), in which driven into a continuous wrap drilling C2 section PE of new sheet piles P engages the section PE of the existing sheet piles P.

As shown in FIG. 1, the vibrating auger machine includes a conventional hydraulic auger 11 in which a vibrating portion 13 is arranged in series, and an output shaft 14b can be provided with an auger rotating action and a pile driving vibration action. Machine.
The section guide 4 only needs to engage with the steel sheet pile section PE to be able to guide and slide, and may have any cross-sectional shape that can be fitted and locked to the cross-sectional shape of the section PE of the steel sheet pile.
Further, since one vibrating auger machine 1 can be a drilling machine by connecting the auger screw 2 or a vibrating pile driving machine by connecting the chuck 5 for gripping steel sheet piles, The output shaft 14b may be detachably connected to the auger screw 2 and the chuck 5 by a detachable mechanism such as a pin.

  Therefore, according to the present invention, as shown in FIG. 6, since the auger screw 2 is guided by the section guide 4 in the steel sheet pile section PE, the lap hole C2 can be formed according to the set value even by a small leaderless auger machine. With the lap amount Ww, a continuous lapping hole C2 having a uniform drilling lap Cw from the upper end to the lower end can be formed, and an appropriate drilling lap Cw can be formed based on a continuous driving sectional shape of the used steel sheet pile. By setting, energy saving vibration driving of the steel sheet pile P becomes possible.

Of course, during the lap drilling, as in the conventional auger screw drilling, the air passing through the inside of the screw from the swivel unit 14 is blown out from the air at the tip of the screw head, the milk outlet ME, and the soil fixed to the screw head cutting edge B. Is blown off to remove dumpling-like earth and sand, assist in drilling, and exhaust air is also circulated to the section guide 4 to make the section guide 4 move up and down smoothly.
Also, the earth and sand that has become too soft due to the lap drilling becomes earth of appropriate hardness by blasting and stirring of cement milk and bentonite, and the penetration strength of the steel sheet pile can be secured.

  Further, since the vibrating auger machine 1 is a working machine that exerts an auger action by rotation and a pile driving action by vibration in one unit, the auger screw 2 and the steel sheet pile gripping chuck 5 are exchanged for the output shaft 14b. By installation, it becomes both an auger drilling machine and a vibratory pile driving machine, eliminating the complicated and laborious work such as replacing the auger working machine with the vibrating working machine in the conventional leaderless foundation machine. The efficiency of the machine is improved, and the work efficiency is improved.

In the steel sheet pile driving method of the present invention, it is preferable to apply vibration to the auger screw 2 as necessary.
In this case, when the screw head 21 of the auger screw 2 is not smoothly drilled by a boulder or the like, or when the section guide 4 or the steel sheet pile section PE of the auger screw 2 is filled with debris, the drilling of the auger screw 2 proceeds. When a large resistance is generated, the vibrating auger machine 1 is vibrated while performing auger drilling, and vertical vibration is applied to the auger screw 2. When the screw head 21 crushes soft rock finely, debris of the section guide 4 is removed. It is peeled off and auger drilling can proceed.
Therefore, even if it is a small leaderless basic machine, since the vibrating auger machine 1 is used, the drilling of the auger screw 2 becomes very smooth even when the single drilling C1 is formed or the lap drilling C2 is formed, Workability is significantly improved.

Further, it is preferable that the steel sheet pile gripping chuck 5 is provided with rotation as required.
Conventionally, at the time of vibration driving of a steel sheet pile, the lower end of the steel sheet pile section PE is engaged with the upper end of the section PE projecting from the ground GL of the existing steel sheet pile, with the chuck 5 holding the upper end of the new steel sheet pile and suspending it. In this case, the positioning is difficult and requires careful attention. However, in the present invention, the vibration auger machine 1 can apply both a rotational force and a vibration force to the output shaft 14b. It is rotatable together with the shaft 14b, and the fine adjustment rotation of the chuck 5 makes it extremely easy to engage the lower end of the suspended new steel sheet pile section PE with the upper end of the existing steel sheet pile section PE. Work efficiency is significantly improved.

Further, as shown in FIG. 6, it is preferable that each steel sheet pile P is driven into each corresponding hole C1, C2 while being shifted rearward in the construction progress direction F with respect to each corresponding hole C1, C2.
In this case, the section guide 4 which generates the resistance to advance in the soil only by descending in the ground is guided in the pre-cut holes C1 and C2 as shown in FIGS. 6 (A) and 6 (D). The reduction in the drilling function due to the provision of the section guide 4 can be minimized.
Therefore, under the minimum ground resistance of the section guide 4, sufficient continuous lap drilling of the lap width (lap amount) Ww of the lap drilling Cw can be smoothly performed.

Further, in the steel sheet pile driving method of the present invention, it is preferable to dispose the section guide (4) at least at the distal end of the auger screw 2 as shown in FIG.
At the time of drilling action of the auger screw 2, the section guide 4 is formed by the auger screw with a smaller drilling resistance, that is, a tendency to shift to the side of the drilled hole, and the tip portion leads the drilling form. 2, the uniform formation of the drilling wrap (wrap portion) Cw becomes smooth.
Of course, when the auger screw 2 is extended to make it longer, it is preferable to arrange the section guide 4 at an appropriate intermediate position. In this case, the extension of the auger screw 2 is provided with the section guide 4 as shown in FIG. It is convenient to carry out with the adapter 3.

  In the present invention, the section guide 4 includes a right section guide piece 4a and a left section guide piece 4b as shown in FIG. 3C, and the right section guide piece as shown in FIG. When the piece 4a is engaged with the steel sheet pile section PE, the auger center point Oc is shifted to the right by a distance d1 from the steel sheet pile meshing center line OO, and when the left section guide piece 4b is engaged with the steel sheet pile section PE, It is preferable to perform lap drilling by shifting the auger center point Oc leftward from the steel sheet pile meshing center line OO by a distance d1.

In this case, “right side” means the right side when viewed in the construction progress direction F (FIG. 7).
As shown in FIG. 6, the steel sheet pile P has a section PE having a trapezoidal cross section with a flat plate portion PF and inclined side plate portions PS on both sides, and formed by engaging the tip of both side plates PS to form an engagement groove PG. As shown in FIG. 7 (A), the continuous wall of the sheet pile P is connected to the continuous wall of the steel sheet pile P by engaging the section PE in a form in which the flat plate portions PF alternately protrude in the opposite directions to the right and left sides.
The formation of the drilling holes C1 and C2 for driving steel sheet piles is more advantageous in drilling energy as the hole diameter is reduced.

Since the section guide 4 has the right side 4a and the left side 4b, the right side of the section guide pieces 4a and 4b can be used both when drilling the right protruding steel sheet pile P and when drilling the left protruding steel sheet pile P. The right and left drilling holes C2 and the left steel sheet pile drilling holes C2 can be neatly drilled and accurately controlled by the section guide pieces 4a and 4b.
Therefore, a continuous lap hole C2 having a minimum diameter required for continuous driving of a steel sheet pile can be rationally formed.

In the steel sheet pile driving method of the present invention, it is preferable that the first drilling C1 and the corner drilling C1 are drilled with a conventional auger screw 2 and larger in diameter than the intermediate drilling C2.
The steel sheet pile P to be driven first and the corner steel sheet pile P are reference steel sheet piles required for the function of positioning the steel sheet pile wall. In the corner part, the lap form of each of the holes C1 and C2 is also a straight part. Since this is different from the lapping mode, if the first drilling C1 and the corner drilling C1 serving as the basis of the subsequent lap drilling C2 are formed in independent large-diameter drilling C1, as shown in FIG. In order to form the lap Cw, the reference steel sheet pile P can be shifted and driven backward in the construction progress direction F, and the drill holes C1 and C2 can be formed in a continuous lap form, and the steel sheet pile can be driven at a predetermined position. Becomes possible.
Therefore, the continuous lap drilling C2 by the auger screw 2 having the section guide 4 is only continuous drilling at the straight portion, and the fitting and detachment work of the section guide 4 to and from the steel sheet pile P becomes easy.

  As shown in FIG. 1, an auger drilling pile driving machine directly used for carrying out the invention of the steel sheet pile driving method of the present application is a vibrating auger machine in which a vibrating portion 13 is interposed and fixed between an auger main body 11 and a swivel portion 14. The auger screw 2 and the steel sheet pile gripping chuck 5 can be exchangeably attached to the first output shaft 14b via the attachment / detachment mechanism P14, and the drive motor M11 of the auger body 11 and the drive motor M13 of the vibrating section 13 are separate. As an independent drive system, a vibration auger machine 1 having a function of an auger working machine and a function of a vibration pile driver is provided.

In this case, the vibrating part 13 may be a vibrator that generates a vertical vibration by rotating a pair of opposed eccentric bodies, and as shown in FIG. 2B, a basic bearing 11c at the lower end of the auger body 11, a swivel part The vibrating part 13 may be fitted to the outer periphery of the strong bearing 12, and the vibrating part 13 may be fixed to the auger body 11 and the swivel part 14.
In addition, the drive system may be provided with another port in addition to the port of the hydraulic circuit of the drive motor (hydraulic motor) M11 of the auger body to form an operation circuit for the vibrating section 13.
The attachment / detachment mechanism P14 of the output shaft 14b only needs to be able to detachably secure the upper end 2T of the auger screw 2 and the upper end of the chuck 5, and typically, the attachment / detachment of the auger screw in a conventional leaderless auger machine. This is a pin mounting mechanism similar to the mechanism.

  If the auger drilling pile driving machine of the present invention is used, the vibration auger machine 1 has the functions of a conventional auger machine and a vibrator (vibrator). This operation becomes unnecessary, and the switching between the drilling operation by the auger screw 2 and the driving operation of the steel sheet pile by the vibrator is simply performed by replacing the auger screw 2 and the chuck 5 with the output shaft 14b of the vibratory auger machine 1. It is possible to streamline the switching between the drilling operation and the vibration driving operation in the steel sheet pile driving work, and the operation rate of the basic machine is improved.

In addition, during the drilling by the auger screw 2, a vertical vibration action can be imparted simultaneously with the drilling rotation operation. Therefore, when the screw head 21 of the auger screw 2 does not smoothly advance due to obstacles such as boulders, When a large resistance is generated in the progress of drilling of the auger screw due to the clogging of the section guide 4 with the debris, the vertical drilling of the auger screw 2 allows the drilling of the auger screw 2 to proceed.
Also, when a chuck 5 for gripping a steel sheet pile is attached to the output shaft 14b of the vibrating auger machine 1 and used as a vibratory pile driving machine, the chuck 5 is rotatable. However, the work of engaging the sections PE with the existing steel sheet pile P becomes extremely easy by adjusting the rotation of the chuck 5.

Further, it is preferable that the auger screw 2 connecting the auger screw main body 20 and the screw head 21 with the adapter 3 having the section guide 4 be connected to the attachment / detachment mechanism P14 of the output shaft 14b of the vibrating auger machine 1.
In this case, since the drilling operation by the auger screw 2 is the engagement slide to the steel sheet pile section PE by the section guide 4 at the connection position of the screw head 21, the auger screw 2 has a predetermined lap amount Ww. Lap drilling C2 can be formed uniformly, and drilling progress can be achieved smoothly by applying vertical vibrations as necessary to the auger screw 2 simultaneously with drilling work.
Of course, even when the auger screw 2 is reconnected, if the auger screw 2 is connected by the adapter 3 having the section guide 4, the auger screw 2 is engaged with the steel sheet pile section PE at a plurality of locations of each adapter 3 and slides deep. The drilling C2 can also be performed uniformly and smoothly.

  Further, as shown in FIG. 3, the adapter 3 of the auger drilling pile driving machine that can be suitably employed in the steel sheet pile driving 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 at an upper end. hj, a sleeve 32 is mounted on a rod 30 having a male joint Jm so as to be rotatable and immovable up and down, a holder 33 is fixed on the sleeve 32, and section guide pieces 4a and 4b are attached to the holder 33. Is preferably detachably fastened.

In this case, since the adapter 3 can be configured as a single member, as shown in FIG. 1, the conventional earth auger screw can be incorporated in a linear connection form between the auger screw main body 20 and the screw head 21, resulting in severe wear. Maintenance of the adapter 3 having the section guide pieces 4a and 4b is facilitated.
In addition, the single adapter 3 can be applied to the addition of the auger screw main body 20, which is advantageous for attaching the section guide 4 to a desired position of the auger screw 2.
In addition, the production and assembly of the adapter 3 is easy by assembling the sleeve 32, the holder 33, and the section guide pieces 4a and 4b on the single rod 30, and the maintenance and management of the auger drilling and pile driving machine are also easy. It becomes.

As shown in FIG. 3, the sleeve 32 is rotatably and vertically moved by the flange 31f on a cylindrical sleeve guide 31 fixed to the rod 30 with guide flanges 31f at the upper and lower ends. It is preferable to restrict the mounting.
In this case, the sleeve 32 divided into two may be welded on the sleeve guide 31 having the guide flange 31f integrally provided vertically and covered between the upper and lower flanges 31f, or may be welded on the rod 30. The cylindrical sleeve 32 may be fitted on the fixed sleeve guide 31, and the upper and lower flanges 31 f may be fixed to the upper and lower ends of the sleeve guide 31 by welding.
Accordingly, a structure in which the sleeve 32 can freely slide and rotate and cannot move up and down can be easily manufactured. Even when the auger screw 2 rotates, the section guide 4 that is smoothly guided up and down by the section PE of the steel sheet pile P is used. Is easy to manufacture.

As shown in FIG. 3, the sleeve guide 31 abuts and integrates the left and right cylindrical divided pieces on the rod 30. The sleeve 32 integrates the left and right cylindrical divided pieces on the sleeve guide 31. It is preferably in the form.
In this case, both the sleeve guide split piece and the sleeve split piece can be easily formed by casting, and the integration of the sleeve guide split piece and the fixation on the rod 30 can be achieved by integrating the sleeve form of the sleeve piece onto the sleeve guide. Since only the welding work is required, the adapter 3 can be easily manufactured without requiring any special equipment.

As shown in FIG. 3, the section guide 4 preferably includes a right section guide piece 4a and a left section guide piece 4b, which are detachably secured to the mounting piece 33P of the holder 33 from both sides.
In this case, the fixing of the section guide pieces 4a and 4b to the holder 33 is facilitated by the bolt screw tightening the bolt holes h4 of the flat plate-shaped mounting piece 33P, so that the alignment and the attachment / detachment work are facilitated, and the maintenance of the adapter 3 is facilitated. It will be easier.
In addition, since the section guide pieces 4a and 4b are dedicated to the right and left sides of the steel sheet pile section PE, the guide control of the auger screw 2 by the steel sheet pile P is accurate, and a smooth continuous lap drilling without rattling. Is possible, the continuous lap drilling C2 is provided with a predetermined drilling lap Cw, and can be performed with the minimum diameter required for driving the steel sheet pile P, thereby enabling energy saving drilling.

According to the invention of the steel sheet pile driving method of the present invention, the lap drilling C2 after the first single drilling C1 is performed by the section guide 4 of the auger screw 2 under the engagement sliding guide with the existing steel sheet pile section PE. Therefore, it is possible to form a hole C2 having a uniform hole wrap Cw from the upper end to the lower end and having the lap amount Ww as set.
Accordingly, by setting an appropriate drilling lap Cw based on the continuous driving cross section of the steel sheet pile used, a continuous lap drilling C2 with a minimum diameter can be formed, and the drilling diameter during continuous lap drilling can be reduced. , And by reducing the driving energy by driving the entire cross section of the steel sheet pile P into the hole C2, the continuous driving of the steel sheet pile can be smoothly performed with energy saving.

  In addition, since the vibrating auger machine 1 is a new working machine (vibratory auger machine) that exerts an auger drilling action by rotation and a sheet pile driving action (vibro pile driving action) by vibration in one unit, the output is increased. The simple exchange mounting of the auger screw 2 and the steel sheet pile gripping chuck 5 on the shaft 14b allows the conventional auger drilling machine or a vibrating pile driving machine (vibrating steel sheet pile driving machine) to be used. In the leaderless basic machine, the auger working machine and the vibration working machine can be replaced with complicated and troublesome work, and the operation rate of the civil engineering basic machine, especially the leaderless basic machine, is improved. Construction work efficiency is improved.

In addition, the output shaft 14b of the vibrating auger machine 1 can be provided with both a rotating force for auger operation and a vertical vibration caused by the vibrating part. Or the resistance of the section guide 4 to drilling progress due to clogging with debris, only by applying vertical vibration while imparting rotary drilling to the auger screw 2, the auger screw 2 The drilling progress prevention resistance can be released, and drilling can be advanced.
Further, when the steel sheet pile P is suspended by the steel sheet pile grasping chuck 5 connected to the output shaft 14b and the section PE of the suspended steel sheet pile is engaged with the section PE of the existing (punched) steel sheet pile P. In addition, since the chuck 5 can be fine-tuned and rotated, the alignment engagement of the steel sheet pile during the driving operation of the steel sheet pile P is facilitated, and the workability is improved.

[Vibration auger machine (Fig. 2)]
FIG. 2A is an overall front view of the vibration auger machine 1, and FIG. 2B is an exploded front view.
As shown in FIG. 2 (A), the vibration auger machine 1 protects a motor with a speed reducer directly connected to a first speed reducer 11a, a second speed reducer 11b, and a basic bearing 11c under a hydraulic motor M11 with a case 1C. The vibrating part 13 is interposed and fixed between the auger main body 11 and the swivel part 14. As shown in FIG. 1 (A), the upper part of the auger main body 11 is mounted on a base machine (leaderless auger machine) with a mounting pin P1. And the auger screw 2 and the steel sheet pile gripping chuck 5 (FIG. 4A) can be exchangeably connected to the output shaft 14b at the lower end of the swivel unit 14 by the attachment / detachment mechanism P14.

As shown in FIG. 2B, the structure of the vibrating auger machine 1 is such that a spline output shaft 11d of an auger body 11 of a motor with a reduction gear (commercially available) is fitted to an output bearing 12a built into a conical roller bearing of a strong bearing 12. Then, the mounting portion B11 of the auger main body 11 and the mounting portion B12 of the strong bearing 12 are fixed at 12 circumferential positions by means of B bolts and B nuts.
The vibrating portion 13 is a vibrator that generates vertical vibration by rotating the eccentric body through a tuning gear with the eccentric body opposed to the vibrating portion 13. The mounting portion C12 and the mounting portion C13 are tightened by bolts and nuts.

In the lower part of the vibrating part 13, the L-shaped bracket is fixed to the mounting part D13 with bolts and nuts, and the L-shaped bracket is fixed to the mounting part D12 of the strong bearing 12 (four locations below the strong bearing).
Further, the output shaft 12b below the strong bearing 12 and the output bearing 14a of the swivel section 14 are connected by a bolt nut E.
Further, when mounting the auger case 1C and the auger body 11, the mounting portion A1 and the mounting portion A11 are tightened by bolts and nuts.
As described above, the vibration auger machine 1 shown in FIG. 2A can be obtained by suitably incorporating the strong bearing 12 and the vibrating portion 13.

[Adapter (Fig. 3)]
The adapter 3 is used as a joint member for connection between the conventional auger screw body 20 and the screw head 21 and also for connecting and connecting the auger screw bodies 20 to each other. The adapter 3 includes the section guide 4. is there.
FIG. 4A is an exploded perspective view of the adapter 3, which includes a rod 30, a sleeve guide 31 that covers and fixes the outer peripheral surface of the rod 30, a sleeve 32 that rotatably covers the outer peripheral surface of the sleeve guide 31, and a sleeve 32. The sleeve guide 31 is composed of a holder 33 fixed to the holder 32 and section guide pieces 4a and 4b attached to the holder 33. The sleeve guide 31 vertically divides a cylinder provided with a flange 31f projecting vertically outward. This is a type, and is welded and fixed on the rod 30 to form a cylindrical shape.

Also, the sleeve 32 is formed by welding with a welding line Lm as shown in FIG. 3B to a cylinder which is rotatable on the outer peripheral surface of the sleeve guide 31 and cannot be moved up and down by the flange 31f, using a two-part cylindrical type. .
The holder 33 includes a mounting piece 33P having a plurality of bolt holes h3 provided vertically and a fixing piece 33C having an inner surface of an arc, and the fixing piece 33C is fixed on the sleeve 32 by welding or the like. .
Further, the right section guide piece 4a and the left section guide piece 4b are provided with an engagement groove 4G for engaging with the steel sheet pile section PE, as shown in FIG. It is provided with a plurality of bolt holes h4 and is about 20 cm vertically long.
Therefore, as shown in FIG. 3C, since the adapter 3 is prepared as a single unit, it is convenient for maintenance and management as a member for the auger screw 2.

[Construction (Figs. 4 and 5)]
As shown in FIG. 1 (A), the first single drilling C1 is formed at the base end of a conventional auger screw 2 in which a screw head 21 is detachably connected to a mounting pin portion P2 of a distal end 20E of an auger body 20 by a pin. As shown in FIG. 4 (A), the ground GL as shown in FIG. 4 (A) is attached to an auger boring machine which detachably connects 20T to a mounting / dismounting mechanism P14 of the output shaft 14b of the vibrating auger machine 1 mounted on a bracket of the leaderless basic machine. A single drilling C1 is formed by a conventional drilling operation to a predetermined depth.
During the formation of the single drilling C1, when the screw head 21 has a problem in the drilling progress due to a boulder or the like, the vibrating unit 13 is simultaneously driven while applying the pressing drilling rotation to the auger screw 2. By applying vertical vibration to the auger screw 2, the drilling of the screw head 21 can be advanced.

When the auger screw 2 is lifted and removed after forming the single hole C1, as shown in FIG. 4B, the conventional auger screw 2 and the conventional steel sheet pile gripper are attached to the output shaft 14b of the vibrating auger machine 1. 5 is exchanged and mounted at the attachment / detachment mechanism P14 to obtain a vibratory pile driver.
Then, the conventional vibrating steel sheet pile driving is performed by applying the vertical vibration by the vibration part 13 of the vibration auger machine 1 and applying the pressing force to the vibration auger machine 1.
In this case, as shown in FIG. 6B, the auger motor M11 is attached to the chuck 5 when positioning the steel sheet pile P in the hole C1 and at a position shifted to the rear side in the construction direction F in the hole C1. The required rotation is given to secure the proper position.

  After the driving of the steel sheet pile P into the single hole C1 is completed, the lower end of the adapter 3 shown in FIG. 3C is fitted to the upper end of the conventional screw head 21 with the female joint Jf to form the joint pin hole hj. 1B, the upper end of the adapter 3 is connected to the lower end 20E of a conventional auger screw body 20 via a male joint Jm and a joint pin hole hj, and the section guide 4 is connected. The auger screw 2 is provided, and the auger screw 2 is mounted on the output shaft 14b at the lower end of the vibrating auger machine 1.

As shown in FIG. 5 (A), the drilling machine equipped with the auger screw 2 with a section guide performs a drilling operation with the section guide 4 engaged with the section PE of the existing steel sheet pile P.
In this case, the relationship between the steel sheet pile P and the section guide 4 is a position where the steel sheet pile P is displaced rearward in the traveling direction F of the single hole C1 as shown in FIG. It is guided in the already drilled hole C1.
During the drilling operation, when the screw head 21 cannot proceed due to obstacles such as a boulder, or when the section guide 4 generates a large resistance due to clogging with debris, vibration occurs simultaneously with the rotary pressing drilling of the auger screw 2. If the section 13 is driven to apply vertical vibration to the auger screw 2, the drilling of the auger screw 2 can be smoothly advanced.
Of course, when the vertical vibration is constantly or intermittently applied to the auger screw 2 during the rotary drilling, drilling workability is improved.

As shown in FIG. 6 (B), after forming a lap hole C2 with a hole wrap Cw having a predetermined lap amount Ww for the single hole C1, the output shaft 14b of the vibration auger machine 1 is again formed. In the state in which the chuck 5 for gripping the steel sheet pile is attached to form a vibrating pile driver, the section PE of the existing steel sheet pile is engaged with the section PE of the existing steel sheet pile P in a state where the new steel sheet pile is lifted by the chuck 5, As shown in FIG. 5B, the steel sheet pile P is driven by the vibration of the vibrating section 13 and the pressing of the foundation machine.
Engagement and alignment of the lower end of the newly installed steel sheet pile section PE in a suspended state with the upper end of the section PE of the existing steel sheet pile whose upper end protrudes from the ground GL is performed by adjusting the rotation of the chuck 5, that is, the output shaft 14b. The workability is significantly improved compared to the conventional vibratory pile driver.

As shown in FIG. 6 (C), the driving of the steel sheet pile into the lap hole C2 results in the driving of the steel sheet pile into the existing hole C1 and the newly formed lap hole C2. If the positioning of the chuck 5, that is, the positioning of the chuck 5, is proper, the steel sheet pile is continuously and uniformly driven.
If the above-described formation of the lap hole C2 and the driving of the steel sheet pile into the lap hole C2 are repeated, continuous engagement driving of the steel sheet pile can be performed.
At the construction site, if a lap drilling machine with an auger screw connected to the vibrating auger machine 1 and a vibratory pile driving machine with a steel sheet pile gripping chuck 5 connected to the vibrating auger machine 1 are used, the vibration auger output can be increased. The work of replacing the auger screw 2 and the chuck 5 on the shaft 14b can be omitted, and the working efficiency is good.

  At the time of each continuous lap drilling, as shown in FIGS. 7 (A) and 7 (B), each existing steel sheet pile P is driven into each corresponding drilling C1, C2 while being shifted rearward in the construction progress direction F. Each drilling center Oc is located at a distance d1 (third-type steel sheet pile) from the steel sheet pile engagement center line OO in the right drill hole where the flat plate portion PF of the steel sheet pile P projects rightward when viewed in the construction progress direction. Is shifted to the right, and the left hole, that is, the hole for the left steel sheet pile that guides the left section guide piece 4b into the section PE is fitted. A hole is drilled with an auger screw of φ500 or φ550 shifted to the left by a distance d1 from the line OO.

  At the corner of the continuous steel sheet pile wall, as shown in FIG. 7 (B), a large-diameter hole C1 is previously drilled at a predetermined position with a conventional earth auger screw. The rear part of the hole C1 in the traveling direction is formed by lapping a hole C2 using the section guide 4 and driving a steel sheet pile P into the driven steel sheet pile P. On the other hand, the steel sheet pile P is sequentially driven at the continuous lap hole C2.

The 90 ° turning of the steel sheet pile P at the corner can be performed smoothly by the large-diameter hole C1.
Further, in drilling, the increase in diameter produces a resistance value which is twice as large as the diameter, so that the smaller the diameter, the more advantageous it is. However, the drilling size should be such that it accepts the steel sheet pile P to be driven. As described above, since the width of the three-type steel sheet pile is 300 mm in the left-right alignment, the drilling center Oc of the auger screw can be appropriately oriented to the left and right by the distance d1 so that the auger screw having a diameter of 500 mm can be suitably implemented, and the hard ground can be formed. It is possible to construct effectively.
However, if there is a danger of the 500 mm diameter drilling intersection point 500P contacting the steel sheet pile P, an auger screw of φ550 may be used.

[Others]
As a means for providing the section guide 4 to the auger screw 2, a rod at the upper end of a conventional screw head 21 is extended to provide the function of the rod 30 in FIG. 3, and the extended rod is provided as shown in FIG. , A sleeve guide 31, a sleeve 32, a holder 33, and section guide pieces 4a, 4b.
In the embodiment of FIG. 3, the sleeve 32 is rotatably mounted on the sleeve guide 31. However, the sleeve guide 31 is omitted, and the cylindrical sleeve 32 is directly rotatably fitted to the outer periphery of the rod 30, The desired sleeve 32 can be obtained even if the iron ring which functions as the upper and lower flanges 31f for regulating the vertical movement of the upper and lower portions of the sleeve 32 is fixed to the rod 30.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the civil engineering foundation machine used for this invention, (A) is a state figure which attached the conventional auger screw, and (B) is the state figure which attached the adapter to the conventional screw head. It is explanatory drawing of the vibration auger used for this invention, (A) is an overall front view, (B) is an assembly explanatory view. It is an explanatory view of an adapter used for the present invention, (A) is an exploded perspective view, (B) is an assembled state perspective view, and (C) is a completed state perspective view. It is a construction explanatory view of the present invention, (A) is a state diagram of forming a single hole, and (B) is a state diagram of driving a steel sheet pile into a single hole. It is construction explanatory drawing of this invention, Comprising: (A) is a state figure of a lap hole formation, (B) is a state figure of steel sheet pile driving in a lap hole. It is a construction explanatory view of the present invention, (A) is a section guide engagement state to the first existing steel sheet pile, (B) is a relationship between the single drilling C1 and lap drilling C2, (C) is It is a figure which shows the steel sheet pile driving state to the lap hole C2, and (D) shows the section guide engagement state to a driving steel sheet pile. It is a figure which shows the steel sheet pile driving state in the hole of this invention, (A) is a linear part, (B) is a figure which shows a corner part. It is explanatory drawing of the prior art example 1, (A) is a side view, (B) is a drilling top view. It is explanatory drawing of the prior art example 2, (A) is a side view, (B) is a principal part horizontal sectional view. It is explanatory drawing of the prior art example 3, (A) is a side view, (B) is a principal part enlarged explanatory view.

Explanation of reference numerals

1 Vibration auger (vibration auger machine)
2 Auger screw 2T Upper end 3 Adapter 4 Section guide 4a Right section guide piece 4b Left section guide piece 4G Engagement groove 5 Chuck 11 Auger body (hydraulic auger)
11a 1st reduction gear (reduction gear)
11b 2nd reduction gear (reduction gear)
11c Basic bearing 11d Spline output shaft (output shaft)
12 Strong bearing (bearing)
12a Output bearing (bearing)
12b Output shaft 13 Vibration part (vibro)
14 Swivel part 14b Output shaft 20 Auger screw main body 20E Tip 20T Base 21 Screw head 30 Rod 31 Sleeve guide 31f Flange 32 Sleeve 33 Holder 33C Fixing piece 33P Mounting piece C1 Single drilling (drilling)
C2 lap drilling (drilling)
Cw drilling lap GL Ground M11, M13 Drive motor (motor, hydraulic motor)
A1, A11, B11, B12, C12, C13, D12, D13 Mounting part Jf Female joint part Jm Male joint part h3, h4 Bolt hole hj Joint pin hole P1, P2, P3 Mounting pin part (mounting pin)
P14 Detachment mechanism (mounting pin, mounting pin)
P steel sheet pile PE section PF flat part PG engagement groove PS inclined part

Claims (13)

  A single hole (C1) is formed by a vibrating auger machine (1) in which the auger screw (2) is connected to the output shaft (14b), and then a chuck (5) for gripping steel sheet piles is connected to the output shaft (14b). The vibrating auger (1) vibrates the steel sheet pile (P) into the drilled hole (C1) and then connects the auger screw (2) with the section guide (4) to the output shaft (14b). With the machine (1), the section guide (4) of the auger screw (2) is engaged with the section (PE) of the existing steel sheet pile (P), and the auger screw (2) is connected to the section (PE) of the existing steel sheet pile. A lap hole (C2) is formed to a predetermined depth under the guidance of the above, and after the auger screw (2) is lifted and removed, the vibrating auger machine (1) in which the chuck (5) is connected to the output shaft (14b) is used. New steel arrow Section (P) to (PE) engages the section (PE) of the existing sheet piles (P) driven into a continuous wrap boring (C2), the steel sheet pile driving method.   The steel sheet pile driving method according to claim 1, wherein vibration is applied to the auger screw (2) as necessary.   The steel sheet pile driving method according to claim 1 or 2, wherein a rotation is imparted to the steel sheet pile holding chuck (5) as necessary.   Each of the steel sheet piles (P) is driven into the corresponding drilled hole (C1, C2) while being shifted rearward in the construction progress direction (F) with respect to the corresponding drilled hole (C1, C2). 3. The steel sheet pile driving method according to any one of 3.   The steel sheet pile driving method according to any one of claims 1 to 4, wherein the section guide (4) is disposed at least at a tip end of the auger screw (2).   The section guide (4) includes a right section guide piece (4a) and a left section guide piece (4b). When the right section guide piece (4a) is engaged with the steel sheet pile section (PE), the auger center point ( Oc) is shifted from the steel sheet pile meshing center line (OO) to the right by a distance (d1), and when the left section guide piece (4b) is engaged with the steel sheet pile section (PE), the auger center point (Oc) is shifted. The steel sheet pile driving method according to any one of claims 1 to 5, wherein the lap hole (C2) is formed by shifting the distance (d1) to the left from the steel sheet pile meshing center line (OO) to the left.   The first drilling (C1) and the corner drilling (C1) are drilled with a conventional auger screw (2) and larger in diameter than the intermediate drilling (C2). Item steel sheet pile driving method.   An auger is attached to an output shaft (14b) of a vibration auger machine (1) having a vibration part (13) interposed and fixed between the auger body (11) and the swivel part (14) via a detachable mechanism part (P14). The screw (2) and the chuck (5) for gripping steel sheet pile can be exchangeably mounted, and the drive motor (M11) for the auger body (11) and the drive motor (M13) for the vibrating section (13) are independent and independent. An auger drilling machine equipped with a vibrating auger machine (1) having both the function of an auger working machine and the function of a vibrating pile driving machine.   An auger screw (2) in which an auger screw body (20) and a screw head (21) are connected by an adapter (3) having a section guide (4) is connected to an output shaft (14b) of a vibrating auger machine (1). The auger drilling and pile driving machine according to claim 8, wherein the auger drilling and pile driving machine is connected to the attaching / detaching mechanism (P14).   The adapter (3) includes a sleeve (30) on a rod (30) having a joint pin hole (hj) and a female joint portion (jf) at a lower end and a joint pin hole (hj) and a male joint portion (jm) at an upper end. 32) is mounted rotatably and immovably up and down, a holder (33) is fixed on a sleeve (32), and section guide pieces (4a, 4b) are detachably fixed to the holder (33). An auger drilling machine according to claim 9.   The sleeve (32) is provided on a cylindrical sleeve guide (31) fixed on a rod (30) with guide flanges (31f) at the upper end and the lower end so as to rotate freely and with the flange (31f). The auger drilling machine according to claim 10, wherein the machine is mounted with vertical movement restricted.   The sleeve guide (31) abuts and integrates the cylindrical left and right divided pieces on the rod (30), and the sleeve (32) integrates the cylindrical left and right divided pieces on the sleeve guide (31). The auger drilling machine of claim 11, wherein:   10. The section guide (4), wherein the right section guide piece (4a) and the left section guide piece (4b) are detachably bolted from both sides to the mounting piece (33P) of the holder (33). 13. The auger drilling and pile driving machine according to any one of claims 12 to 12.

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