JP2004162528A - Continuous lap drilling method by auger drilling machine, and auger drilling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out continuous lap drilling of high quality for formation of a continuous wall by a steel sheet pile by using an earth auger. <P>SOLUTION: The steel sheet pile P1 is driven into the first drilled hole C1. A section guide 4 arranged at an end of an auger screw is fitted to a section PE of the steel sheet pile P1 which is driven, and the auger screw 1 is brought down to a predetermined depth while drilling a hole, under a guidance of the section PE of the steel sheet pile P1 so that a drilling hole C2 having a drilling lap Cw may be formed adjacent to the ready-drilled hole C1. Then the auger screw 1 is lifted and pulled out under a sliding movement guidance of the section guide at the section PE of the steel sheet pile. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to continuous lapping by an auger drilling machine for facilitating driving of steel sheet piles at the time of continuous wall formation with steel sheet piles of mountain retaining for preventing earth and sand collapse and continuous driving of steel sheet piles into a stratum such as soft rock. It relates to drilling and belongs to the technical field of civil engineering foundation work.

  In order to create continuous walls for mountain retaining and continuous driving of steel sheet pile into the layer of soft rock, etc., the side of the next drilled vertical hole partially overlaps with the continuous lap drilling, that is, the vertical hole drilled with an auger screw. It is necessary to form holes in (overlap) form, and drill holes in a continuous form while partially overlapping each hole. However, in drilling with a leaderless auger drilling machine, Even if the drilling operation is performed so that the next drilling hole overlaps, the auger screw is held only at the upper end, so the auger screw being worked is shifted toward the drilled hole with less resistance as it progresses And the desired lap drilling was not possible.

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 that descends with the auger screw on the leader and the screw guide at the lower end of the leader, the screw head that advances underground has a drilling hole with less drilling resistance to the drilled hole side It tends to cause slippage.
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 already proposed a continuous lap drilling technique using a leaderless auger machine of Conventional Example 1 shown in FIG. 8 as Japanese Patent Application No. 9-112282 (Japanese Patent Application Laid-Open No. Hei 10-311031).
Conventional example 1 is disclosed in Patent Literature 1, in which the first steel sheet pile is driven into a state where the upper part protrudes from the ground by 1 to 2 m, and has an inner diameter slightly larger than the auger screw outer diameter, and has an outer peripheral side surface. A 1 to 3 m long steel pipe having a guide section is mounted on the ground with the guide section fitted to the section of the steel sheet pile, and the second pipe is guided while guiding the ground portion of the auger screw with the steel pipe. After drilling the hole for the steel sheet pile, remove the auger screw after the drilling of the second hole, then pull out the mounted steel pipe from the first steel sheet pile and fix the first steel sheet pile to the specified position. At the same time, the second steel sheet pile is engaged with the first steel sheet pile and driven into a form projecting 1 to 2 m above the ground.

The present applicant has proposed a conventional example 2 shown in FIG. 9 as a continuous lap drilling method using a leaderless auger machine.
Conventional example 2 is disclosed in Patent Literature 2, in which a plurality of cylindrical auger screw guides are arranged for space drilling 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 interval drilled holes a1 to a4 are drilled. Repositioning in the form located in the middle of the drilled holes a1 to a4, then drilling the drilled casing for the auger screw guide, and then lap drilling the drilled casing with the auger screw It is.

JP-A-10-311031 Japanese Patent No. 3233613 (Japanese Patent Laid-Open No. 2000-319881)

In Conventional Example 1 (Patent Document 1) shown in FIG. 8, a steel pipe for auger screw guide is engaged with a section of a driven sheet pile and has a height of 1 to 3 m from the ground. Since the auger screw is formed on the upper part of the drilling hole for the second steel sheet pile, the auger screw does not interfere with the already driven steel sheet pile and is guided on the ground part. Although it is a leaderless auger machine, it is capable of continuous lap drilling with the same effect as a leader type auger machine with the support of two points with a steel pipe on the ground. As the screw head travels deeper into the ground, the screw head shifts toward the pre-drilled hole with less drilling resistance.
In addition, the fitting of the auger screw guide steel pipe to the existing steel sheet pile, the removal, and the driving of 1-2 m above the ground for the fitting of the steel sheet pile to the steel pipe, the complete driving to the predetermined position after removing the steel pipe, etc. And many steps are complicated.

  Further, in the conventional example 2 (Patent Document 2) shown in FIG. 9, 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. Therefore, the auger screw is completely guided throughout the entire length even in the ground, and a continuous lap drilling as specified is obtained, which is smaller than the continuous lap drilling of the leader type auger machine and the leaderless auger machine of the conventional example 1. A much higher quality continuous lap drilling can be obtained, but the arrangement for ruler spacing drilling, the repositioning of the ruler for drilling casing guide reversal, the drilling casing driving and the auger screw into the driving casing Including a ruler positioning such as continuous lap drilling, the number of steps is large, complicated, and there is a problem in workability.

  The present invention is to solve or improve the problems of the conventional leader type auger drilling machine and the conventional examples 1 and 2 at once with respect to the formation of the drilling hole for driving the steel sheet pile. The new underground guidance control always guides the screw head to a predetermined state regardless of the augmentation depth of the auger screw, so that continuous lap drilling as designed can be performed rationally.

  In the continuous lap drilling method using the auger drilling machine of the present invention, for example, as shown in FIG. 1, a steel sheet pile P1 is driven into a drill hole C1, and then the tip of the auger screw 1 is inserted into a section PE of the driven steel sheet pile P1. The section guides 4, 41, 42, 43 arranged in the section are fitted, the auger screw 1 is drilled down to a predetermined depth below the guide in the section PE of the steel sheet pile P1, and drilled into the drilled hole C1. A hole C2 having a lap Cw is formed adjacently, and then the auger screw 1 is lifted and removed under the sliding guide of the section guides 4, 41, 42, 43 in the sheet pile section PE.

In this case, the drilling hole C1 is for driving the first steel sheet pile P1 and drilling with a normal earth auger screw without the section guide 4. The leader type auger machine or the leaderless auger machine is used. But you can drill.
Further, in the continuous lap drilling, after the section guide 4 of the auger screw is fitted into the section PE of the steel sheet pile into which the auger screw has been driven, the drilling work is started. It is convenient to form the section guide 4 on the auger screw so that it is slightly protruded from the ground so that the section guide 4 can be easily placed on the auger screw. It may be arranged on the screw head 2 or between the screw head 2 and the screw body 1 in the form of an adapter.

The section guide 4 may be engaged with the ear of the steel sheet pile, that is, the section, in a vertical sliding manner, and as shown in FIGS. 3 and 4, the bent engagement edge of the section PE of the steel sheet pile. Of the section guides 41 and 42 shown in FIGS. 5 (B) and 5 (C), even if it is in the form of fitting into the fitting groove PG, that is, the form similar to the bent engagement edge of the section PE of the steel sheet pile. As shown in the section guide 43 of FIG. 5D, the section PE portion is restrained from the outside and the inside, or the section PE portion is fitted into the entire section PE portion from the outside with a ∪ shape. Is also good.
The section guide 4 receives the contact stress against the section PE of the steel sheet pile P1 due to the rotation of the earth auger during the drilling operation, and also suppresses the stress that the screw head slips into the drilled hole C1 side with little excavation resistance. 5D, the intended purpose can be achieved if the section PE is abutted and fitted from the outside in a 外側 -shaped cross section as shown in FIG. 5D.

According to the present invention, the auger screw 1 controls the posture at two points of the auger upper pin mounting portion (FIG. 2) at the upper end and the section guides 4, 41, 42, 43 at the lower end. Since the section guide 4 of the section is always engaged with the steel sheet pile P1, the section guide 4 is subjected to the attitude control action at the upper and lower two points irrespective of the underground drilling depth, and the adjacent cutting guided by the steel sheet pile P1 is controlled. The hole C2 has a uniform lap hole Cw from the ground surface to the hole tip.
The lap amount Ww (overlap amount) of the lap hole Cw can also be freely determined by adjusting the position of the section PE of the steel sheet pile P1 in the hole C1.
Therefore, according to the present invention, a uniform lap drilling over the entire vertical length can be obtained with the leader type auger drilling machine or the leaderless auger drilling machine under the desired lap amount Ww.

Of course, even during lap drilling, as with conventional auger screw drilling, the air that passed through the screw from the swivel part blows out the air at the tip of the screw head, the milk outlet M, and removes the earth and sand that has adhered to the screw head cutting edge B. The section guide 4 is blown away to remove dumpling-like earth and sand, and the drilling is assisted. In addition, air flows around the section guide 4 so that the section guide 4 moves 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 squirting and stirring of cement milk and bentonite, and the penetration strength of the steel sheet pile can be secured.

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

In this case, “right side” means the right side when viewed in the construction progress direction F (FIG. 7).
As shown in FIG. 5, the section of the steel sheet pile P (P1, P2) has a trapezoidal shape with a flat plate portion PF and inclined side plate portions PS on both sides, and a groove PG is formed by bending the tip of both side plates PS. As shown in FIG. 7A, the continuous wall of the steel sheet pile P is connected to the continuous wall of the steel sheet pile P by engagement of the section PE so that the flat plate portions PF alternately protrude in the opposite directions to the right and left sides.
The drilling holes C1 and C2 for driving steel sheet piles are 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 drilling hole C2 for the right steel sheet pile and the drilling hole C2 for the left steel sheet pile can be drilled neatly and accurately under the guide control by the accurate section guide pieces 4a and 4b.
Therefore, a hole C2 having a minimum diameter required for driving a steel sheet pile can be rationally formed.

Further, as shown in FIG. 6, the steel sheet piles P1, P2 are preferably driven into the corresponding drilled holes C1, C2 while being shifted rearward in the traveling direction F with respect to the corresponding drilled holes C1, C2.
In this case, as shown in FIG. 6 (C), the section guide 4 which only descends in the ground and does not have a drilling function is guided in the already drilled holes C1 and C2. Deterioration of the drilling function due to the addition of the hole is avoided.
Therefore, continuous lap drilling with sufficient lap width (lap amount) Ww of the lap drilling Cw can be smoothly performed under the minimum underground resistance of the section guide 4.

In the continuous lap drilling of the present invention, it is preferable that the first drilling C1 and the corner drilling C1 are drilled with a conventional auger screw and larger in diameter than the intermediate drilling C2.
The steel sheet pile P1 to be driven first and the corner steel sheet pile P are required to have a function of positioning the steel sheet pile wall. In the corner part, the lap form of each of the drilled holes C1 and C2 is also different from the lap form in the straight part. If an independent large-diameter drill hole C1 is formed, a lap form of each of the drill holes C1 and C2 becomes possible, and it becomes possible to drive a steel sheet pile at a predetermined position.
Therefore, in the continuous lap drilling, the section guide 4 attached to the auger screw is only a 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.

The auger drilling machine which can be advantageously applied to the invention of the continuous lap drilling method of the present application is provided with a male joint Jm having a cutting edge B and a blade 1W at a lower end and a joint pin hole hj at an upper end, for example, as shown in FIG. The sleeve 32 is mounted on the rod 1b of the screw head 2 so as to be rotatable and immovable up and down, the holder 33 is fixed on the sleeve 32, and the section guides 4, 41, 42 and 43 are attached to the holder 33. The screw head 2 is detachably fixed, and the screw head 2 is connected to a lower end of the auger screw 1 by a joint pin JP.
In this case, the adapter 3 including the sleeve, the holder, and the section guide may be disposed by slightly extending the rod 1b of the screw head 2.

During continuous lap drilling, the section guides 4, 41, 42, and 43 move up and down in the earth and sand in the drilled hole C1 without rotation, and are likely to be worn, so that replacement maintenance is required.
The screw head 2 is also a part that needs to be replaced due to damage to the earth auger.
Since the section guide 4 is detachably fixed to the screw head 2, it is easy to update only the section guide with high consumption, and the holder 33 and the sleeve 32 are integrated with the screw head 2. Switching from the continuous lap drilling C2 with a hole to the drilling C1 without a normal section guide is also facilitated by switching the joint pin JP connection of the screw head 2.

  Therefore, a normal screw head 2 and a screw head 2 equipped with an adapter 3 including a sleeve 32, a holder 33, and section guides 4, 41, 42, 43 are prepared, and the screw heads 2 are appropriately switched and used. By the maintenance of the section guide, the continuous lap drilling of the present invention can be suitably performed, and high-quality lap drilling can be performed under the guidance control of the screw head at the tip of the earth auger.

  Further, as shown in FIG. 4, the auger drilling machine which can be suitably used in the continuous lap drilling method 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 joint Jm at an upper end. The sleeve 32 is mounted on the provided rod 1b 'so as to be rotatable and immovable up and down, the holder 33 is fixed on the sleeve 32, and the section guides 4, 41, 42 and 43 are detachably attached to the holder 33. It is preferable that the adapter 30 is fixed to the adapter 30, the adapter 30 is connected to the lower end of the auger screw 1 by a joint pin JP, and the screw head 2 is connected to the lower end of the adapter 30 by a joint pin JP.

In this case, since the adapter 30 can be configured as a single member, it can be assembled in a straight line connection form between the auger screw 1 and the screw head 2 of the conventional earth auger screw, and the section guides 4, 41, 42, which are severely worn, Maintenance of the adapter 30 provided with 43 becomes easy.
Since the single adapter 30 is provided, the distance from the tip bit (edge) B to the section guide is increased as compared with the screw head 2 with the adapter 3 shown in FIG. May be absorbed by the amount of protrusion of the steel sheet pile P onto the ground.
Further, the production and assembly of the adapter 30 can be easily performed by assembling the sleeve 32, the holder 33, and the section guides 4, 41, 42, and 43 on the single rod 1b ', thereby maintaining and managing the auger drilling machine. Also becomes easier.

As shown in FIGS. 3 and 4, it is preferable that the section guide 4 detachably attaches the right section guide piece 4a and the left section guide piece 4b 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 fastening to the flat plate-shaped mounting piece 33p, so that the alignment and the attaching and detaching work are easy, and the maintenance of the adapters 3 and 30 is easy. Become.
Moreover, 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 1 by the steel sheet pile P is accurate, and a smooth continuous lap drilling without rattling. Becomes possible.

As shown in FIGS. 3 and 4, the sleeve 32 is rotatably and rotatably mounted on a cylindrical sleeve guide 31 fixed on the rods 1b and 1b 'with guide flanges 31f at the upper and lower ends. It is preferable that the mounting is performed with the vertical movement restricted by the flange 31f.
In this case, the sleeve 32 may be formed by welding a sleeve 32, which is divided into two parts, between the upper and lower flanges 31f on the sleeve guide 31 integrally provided with the guide flange 31f in the upper and lower directions, or on the rods 1b, 1b '. The upper and lower flanges 31f may be fixed to the upper and lower ends of the sleeve guide 31 by welding.
Therefore, a structure in which the sleeve 32 is freely slidable and rotatable and incapable of vertical movement can be easily manufactured, and the section guide 4 that is vertically guided by the section PE of the steel sheet pile P can be easily formed even when the auger screw 1 rotates. Can be formed.

As shown in FIGS. 3 and 4, a sleeve guide 31 fixes the left and right cylindrical divided pieces to the rods 1b and 1b 'by welding and integrally fixes them. It is preferable to form an integral cylindrical shape on the guide 31.
In this case, both the sleeve guide divided piece and the sleeve divided piece can be easily produced by casting, and the integration of the sleeve guide divided piece and the fixation on the rods 1b, 1b 'can be achieved by forming the sleeve piece on the sleeve guide. The integration is also performed only by the welding operation, and the manufacture of the adapters 3 and 30 does not require any special equipment and becomes easy.

  Further, in the auger drilling machine of the present invention, the holder 33 has the mounting pieces 33d and 33p at the distal end in which a plurality of mounting holes h3 are vertically provided, and the fixing piece 33C having an inner surface of an arc. It is preferable that the section guides 4, 41, 42, and 43 are fixed to the outer peripheral surface of the sleeve 32 and are removably bolted through the mounting holes h3 of the mounting pieces 33d and 33p.

In this case, as shown in FIG. 5A, the cross-sectional shape of the holder 33 may be such that the flat plate-shaped mounting piece 33p protrudes from the circular arc fixing piece 33C, as shown in FIGS. 5B, 5C, and 5D. As described above, the plate member protruding from the circular arc fixing piece 33C may be provided with a mounting piece 33d in an orthogonal shape at the tip end.
Accordingly, the integral fixing of the holder 33 to the sleeve 32 can be easily carried out by welding the fixing piece 33C to the surface of the sleeve 32 on the inner surface of the arc, and the holder 33 is provided with a plurality of mounting pieces h3 provided with the vertical mounting holes h3. The section guides 33d, 33p allow the section guides 4, 41, 42, 43 to be detachably and firmly mounted, and facilitate maintenance of the section guide, which is the most severely worn.

According to the present invention, the auger screw 1 is a posture control at two points, that is, the mounting portion for the drilling machine at the upper end and the section guides 4, 41, 42, 43 at the lower end. Since the lapping hole W is held and guided by the steel sheet pile P, the lapping amount Ww of the lapping hole Cw is as set, and the lapping hole Cw having the uniform lapping amount Ww is obtained.
Therefore, it is possible to easily perform lap drilling much more evenly than the lap drilling of the leader type auger machine or the leaderless auger machine of the conventional example 1, and achieve a uniform lap drilling with the lap drilling of the leaderless auger machine of the conventional example 2. High quality lap drilling can be obtained easily and with high efficiency.

[Guide adapter]
[Example 1 (FIG. 3)]
A section guide 4 is attached as a guide adapter 3 to a screw head of a conventional earth auger.
FIG. 3A is an exploded perspective view of the adapter. As shown in the figure, the adapter 3 is attached to a two-part type sleeve guide 31, a two-part type sleeve 32, a holder 33, and a holder 33. And the section guide pieces 4a and 4b.
That is, a conventional male joint Jm having a joint pin hole hj at the upper end thereof protrudes from the rod 1b, and the lower half of the rod 1b has a screw blade 1W and a cutting head B having a cutting edge B. Only 1b is lengthened by the dimension for attaching an adapter.

  FIG. 3B is a perspective view of an assembled state of the adapter, in which a two-piece sleeve guide 31 having flanges 31f at upper and lower ends is welded and integrated with the rod 1b, and then the two-piece sleeve 32 is formed into a tubular shape on the sleeve guide 31. The sleeve 32 is integrated by welding so that the sleeve 32 can slide and rotate on the sleeve guide 31 between the upper and lower flanges 31f under vertical movement restrictions.

The holder 33 is provided with a flat plate-shaped mounting piece 33p at the outer end and a fixing piece 33C having an arcuate surface at the inner end, and the mounting piece 33p provided with a desired number (standard: 5) of bolt holes. Then, the arc surface of the holder fixing piece 33 </ b> C is abutted and welded to the outer periphery of the sleeve 32 to integrate the holder 33 with the sleeve 32.
Next, as shown in FIG. 3C, a right section guide 4a and a left section guide each having a fitting groove 4G having a cross-sectional shape engaging and sliding with the section PE of the steel sheet pile, and having a plurality of fastening holes h4. 4b is attached to the holder 33.

  FIG. 3C is a perspective view in which the section guide adapter 3 is incorporated in the conventional screw head 2, and the sleeve 32 is rotatable and slidable on the sleeve guide 31 integrated with the rod 1b. A holder 33 is integrated on a rotatable sleeve 32 which is regulated up and down by 31f, and has two section guide pieces 4a and 4b on the right and left.

  The section guide pieces 4a and 4b can theoretically even support the point of the section, but the fitting groove 4G length L4 is appropriately determined in consideration of damage prevention of the sheet pile section PE and smooth sliding action surface. Normally, L4 may be 20 to 30 cm, and the length L32 of the sleeve 32 may be shorter than the section guide length L4, and may be fitted in the L31 between the flanges 31f. Preferred for inhibition.

[Example 2 (FIG. 4)]
A section guide adapter 30 is disposed between a conventional auger screw 1 and a screw head 2.
FIG. 4A is an exploded perspective view of the adapter 30. The adapter 1 includes a rod 1b ', a sleeve guide 31 that covers and fixes on the rod 1b', a sleeve 32 that covers the sleeve guide 31 so as to rotate freely, and a sleeve. 32, and a section guide piece 4a, 4b attached to the holder 33. The adapter 3 of Example 1 (FIG. 3) is assembled with the example 1 on the rod 1b of the screw head 2. On the other hand, Example 2 is different only in that a rod 1b 'separate from the screw head 2 is employed.

  Therefore, as shown in FIG. 4C, since the adapter 30 is prepared as a single unit, it is convenient in terms of maintenance and management as an auger drilling machine. However, as is clear from FIG. 2, the adapter of Example 1 (FIG. 3) is used. Since the distance Sh2 when the adapter 30 is applied in Example 2 is larger than the distance Sh1 from the screw tip to the adapter 3 when the 3 is applied, the section guide 4 is fitted to the steel sheet pile P1 at the start of lap drilling. Requires that the steel sheet pile P1 be arranged to protrude further upward.

[Construction]
As shown in FIG. 5 (A), a conventional auger drilling machine is used to form a hole C1 of φ600, and then a conventional hydraulic vibrator is used to drill the left steel sheet pile P1. It is driven into C1 and shifted backward in the traveling direction F (FIG. 6A).
Next, using an auger drilling machine provided with a section guide 4, the right side section guide piece 4a is fitted into the section PE of the steel sheet pile P which is driven into the borehole C1 as shown in FIG. Then, a new adjacent lap hole C2 is formed while maintaining the lap amount Ww (FIG. 6) in the already-cut hole C1 while guiding the auger screw to the lower end while being guided by the section guide piece 4a (FIG. 6A).

In forming the lap hole C2, since the steel sheet pile P1 is driven in the first hole C1 so as to be shifted rearward in the traveling direction, the section guide piece 4a and the holder 33 are guided downward in the already-cut hole C1. As a result, the entry resistance is such that it does not hinder the work.
When the continuous lap drilling C2 is completed, the earth auger is pulled up, and a conventional right steel sheet pile P2 is driven with a hydraulic vibrator (FIG. 6B).
Next, the lap drilling C2 for the left steel sheet pile by the auger screw under the guide sliding of the left section guide piece 4b using the steel sheet pile section (FIG. 6C), and the driving of the left steel sheet pile P by the hydraulic vibrator. The process is performed, and right and left are alternately repeated.

  At the time of each continuous lap drilling, as shown in FIGS. 7A and 7B, each driving steel sheet pile P is driven to be shifted rearward in the construction progress direction F with respect to each corresponding drilling C1 and C2. In the right drilling where the flat plate portion PF of the steel sheet pile P projects to the right when viewed in the construction progress direction, each drilling center Oc is located at a distance d1 from the steel sheet pile engaging center line OO (type III steel sheet). In the case of a sheet pile, it is shifted to the right by 40 mm), and in the case of 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, the hole Oc engages with the hole center Oc. A hole is drilled with an auger screw of φ500 or φ550 shifted to the left by a distance d1 from the center 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 driving of the steel sheet pile P in the 90 ° turning direction at the corner portion can be smoothly performed by the large-diameter hole C1.
In drilling, the increase in diameter produces a resistance value that is twice as large as that of drilling. Therefore, drilling with a small diameter is more advantageous, but the drilling size should be such that it accepts the driven steel sheet pile P, and is shown in FIG. 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 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.

[Modification of section guide (Fig. 5)]
As shown in FIG. 5B, the section guide has a U-shaped cross section and has a holding piece 41F at the tip of the central protruding separation piece 41d. The right and left fitting grooves 41G on both sides of the protruding separating piece 41d can guide the fitting of the steel sheet pile to the right and left sections PE.
Further, as shown in FIG. 5 (C), it is also possible to adopt a type of fitting from the section PE of the steel sheet pile P to the inclined portion PS, and as shown in FIG. It is also possible to adopt a type that is fixed to the mounting piece 33d at the tip of the holder 33.

In the type of FIG. 5D, one fitting groove 43G is a type that fits into both the right and left sections PE and has a play, so that the corner drilling C1 (FIG. 7). Even lap drilling is possible.
The loose fitting of the fitting groove 43G with the section PE is also caused by the stress acting on the sleeve 32 due to the rotation of the auger screw during the drilling operation and the stress acting on the auger screw 1 shifted toward the already drilled hole. The fitting groove 43G of the guide 43 is in contact with the section PE, and does not hinder the guide sliding of the steel sheet pile P in the section PE.

[Others]
In the adapter 3 in Example 1 (FIG. 3) and the adapter 30 in Example 2 (FIG. 4), the sleeve guide 31 was fixed on the rods 1 b and 1 b ′ in layers, but the cylindrical sleeve 32 was directly connected to the rods 1 b and 1 b ′. The upper and lower end positions of the sleeve 32 are fitted with a position regulating ring which functions as the flange 31f in Examples 1 and 2, and only the vertical position regulating ring is bolted to the rods 1b, 1b '. The sleeve 32 may be mounted on the rods 1b, 1b 'so as to be freely rotatable and immovable up and down by fastening or welding.
In this case, the formation of the section guide adapters 3, 30 can be rationally performed, and particularly, if the position restricting ring is bolted to the rods 1b, 1b ', the assembly and maintenance of the adapters 3, 30 can be rationalized.

  The section guides 4, 41, 42, and 43 employed in the present invention can be easily attached to a conventional auger screw as the adapters 3 and 30, and the auger screw provided with the section guide 4 is slidably guided at the tip. Therefore, regardless of whether it is used in a conventional leaderless auger drilling machine or a leader type auger drilling machine, high quality lap drilling as designed can be achieved under a predetermined lap amount Ww. It can be used not only for less auger drills but also for leader drills.

It is a figure which shows the drilling state of this invention, (A) is the time of a drilling start, (B) is a figure in the middle of drilling, (C) is a figure which shows a lap drilling type | form state. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the auger drilling machine of this invention, (A) is the whole schematic diagram which attached the adapter 3, and (B) is a figure which shows only the part of other adapter 30. It is explanatory drawing of Example 1 of the guide adapter of this invention, (A) is an exploded perspective view, (B) is an assembled state perspective view, (C) is a completed state perspective view. It is explanatory drawing of Example 2 of the guide adapter of this invention, (A) is an exploded perspective view, (B) is an assembled state perspective view, (C) is a completed state perspective view. FIGS. 4A and 4B are explanatory diagrams of the operation of the section guide, wherein FIG. 4A shows the section guide 4 in FIGS. 3 and 4, FIG. 4B shows another section guide 41, FIG. () Is a diagram showing a section guide having a ∪-shaped section. It is an action explanatory view of the present invention, (A) shows the relation of lap drilling C2 to the first drilling C1, (B) shows the state of driving steel sheet pile into lap drilling C2, (C) shows the relationship. It is a figure showing the section guide fitting state to a steel sheet pile. It is a figure which shows the steel sheet pile driving state in a drill hole, (A) is a linear part, (B) is a figure showing a corner part. It is a figure of the prior art example 1, (A) is a top view, (B) is a side view, (C) is the elements on larger scale of (A). It is a figure of the prior art example 2, (A) is a side view, (B) is a drilling top view.

Explanation of reference numerals

1 Auger screw (earth auger screw)
1a, 1b, 1b 'Rod 1W Blade 3, 30 Adapter (guide adapter)
4, 41, 42, 43 Section guides 4a, 4b Section guide pieces 4G, 41G, 42G, 43G Fitting grooves (fitting grooves)
31 sleeve guide 31f flange 32 sleeve 33 holder 33C fixing piece 33d, 33p mounting piece 41F, 42F holding plate C1, C2 drilling hole Cw drilling wrap (wrap part)
P, P1, P2 Steel sheet pile PE section PF Flat part PG Fitting groove PS Inclined part

Claims (10)

  The steel sheet pile (P1) is driven into the drilled hole (C1), and then the section guide (4, 41, 42) arranged at the tip of the auger screw (1) is inserted into the section (PE) of the driven steel sheet pile (P1). , 43), the auger screw (1) is drilled down to a predetermined depth under the guidance of the section (PE) of the sheet pile (P1), and the drill wrap (C1) is drilled into the drilled hole (C1). Cw) is formed adjacently, and then the auger screw (1) is raised and removed under the sliding guide of the section guide (4, 41, 42, 43) in the steel sheet pile section (PE). Continuous lap drilling using an auger drill.   The section guide (4) has a right section guide piece (4a) and a left section guide piece (4b). When the right section guide piece (4a) is fitted to the steel sheet pile section (PE), the auger center point is set. (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) meshes with the steel sheet pile section (PE), the auger center point (Oc) is shifted. The continuous lap drilling method according to claim 1, wherein the drilling is performed by shifting the distance (d1) to the left from the steel sheet pile meshing center line (OO).   2. The steel sheet pile (P1, P2) is driven into each corresponding hole (C1, C2) while being shifted rearward in the traveling direction (F) with respect to each corresponding hole (C1, C2). Or 2 continuous lap drilling methods.   4. The drilling method according to claim 1, wherein the first drilling (C1) and the corner drilling (C1) are drilled with a conventional auger screw and have a larger diameter than the intermediate drilling (C2). Continuous lap drilling method.   A sleeve (32) is placed on a rod (1b) of a screw head (2) having a cutting edge (B) and a blade (1W) at a lower end and a male joint (Jm) having a joint pin hole (hj) at an upper end. The holder (33) is fixed on the sleeve (32) so as to be rotatable and immovable up and down, and the section guides (4, 41, 42, 43) are detachably fixed to the holder (33). An auger drilling machine, comprising: a screw head (2), wherein the screw head (2) is connected to a joint pin (JP) at a lower end of the auger screw (1).   The sleeve (32) is rotated on a rod (1b ') 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. The adapter is mounted freely and immovably up and down, the holder (33) is fixed on the sleeve (32), and the section guides (4, 41, 42, 43) are detachably fixed to the holder (33). (30), the adapter (30) was connected to a joint pin (JP) at the lower end of the auger screw (1), and the screw head (2) was connected to a joint pin (JP) at the lower end of the auger screw (1). Drilling machine.   7. The section guide (4), wherein the right section guide piece (4a) and the left section guide piece (4b) are detachably secured to the mounting piece (33p) of the holder (33) from both sides. Auger drilling machine.   The sleeve (32) has a guide flange (31f) at the upper end and the lower end, and is rotatably and flanged on a cylindrical sleeve guide (31) fixed on the rod (1b, 1b '). The auger drilling machine according to any one of claims 5 to 7, wherein the auger drilling machine is mounted while restricting vertical movement in 31f).   The sleeve guide (31) abuts and integrates the cylindrical left and right two-pieces into the rods (1b, 1b '), and the sleeve (32) holds the cylindrical left and right two-pieces on the sleeve guide (31). 9. The auger drilling machine according to claim 8, wherein the auger drilling machine is formed into an integrated cylindrical shape.   The holder (33) has a mounting piece (33d, 33p) at the tip end in which a plurality of mounting holes (h3) are vertically provided, and a fixing piece (33C) having an inner surface of an arc. The section guide (4, 41, 42, 43) is fixed to the outer peripheral surface of the sleeve (32) by bolts via attachment holes (h3) of the attachment pieces (33d, 33p). 9. The auger drilling machine according to any one of 9 above.

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