JP5670282B2 - Excavator and method for forming excavation hole - Google Patents

Description

  The present invention relates to an excavator that excavates ground in a vertical direction to form excavation holes, and a method for forming excavation holes using the excavator.

  When the excavation hole is formed using an excavator such as a boring machine, a method of filling the excavation hole with mud water and discharging the excavated sediment from the excavation hole by mud circulation can be employed. As this type of construction method, for example, the TBH construction method (top drive reverse construction method) described in Non-Patent Document 1 can be cited.

  In the TBH method, as shown in FIG. 12, the swivel head 102 of the TBH excavator 101 lowers while rotating a plurality of cylindrical reverse rods 103 connected in series. A reverse bit 104 is provided at the lower end of the reverse rod 103, and the ground is rotated and excavated by the reverse bit 104 in accordance with the rotation of the reverse rod 103. In parallel with this excavation, a stabilizing liquid such as muddy water and bentonite solution in the stabilizing liquid tank 105 is sent to the excavation hole 107 via the sand pump 106. Stable liquid and earth and sand in the excavation hole 107 pass through the inside of the reverse rod 103 and are sucked into the suction pump 108. Stabilizing liquid and earth discharged from the suction pump 108 are guided to a primary screen 109, a secondary screen 110, and a cyclone screen 111 provided in advance in the stabilizing liquid tank 105, where the stabilizing liquid and earth and sand are separated. The The separated stabilizing liquid is supplied again to the excavation hole 107 via the stabilizing liquid tank 105 and the sand pump 106. On the other hand, the separated earth and sand are sent to the remaining earth tank 112.

  In addition, as a device for press-fitting a cylindrical casing (steel pipe, etc.) used for foundation work etc. into the ground, in general, an oscillating type that press-fits by oscillating the casing and a press-fitting by rotating the casing It is known that it is a rotary type.

  Among these casing press-fitting devices, for example, the casing press-fitting device described in Patent Document 1 can be cited as a rotary type. In the casing press-fitting device described in Patent Document 1, a chuck device that holds the casing by tightening the divided ring by a hydraulic cylinder is provided on the rotating body, and the rotating body can be rotated while the rotating body is rotated by a hydraulic motor. The elevating frame supported by the cylinder is moved up and down by a thrust cylinder to press-fit (push) and pull out the casing.

JP-A-61-270418

Large-diameter boring method-TBH method, [online], Large-diameter boring association, [Search August 3, 2011], Internet <URL: http://www.daikoukei.ne.jp/kouho/tbh/index. html>

  By the way, when constructing cast-in-place concrete piles in close proximity to important structures such as existing railway tracks, there is a concern about the adverse effects on the surrounding ground due to the loosening of the excavation holes formed by the excavator. Is required. As a countermeasure, there is a method of avoiding adverse effects on the surrounding ground by applying ground improvement by injecting chemical solution in advance when constructing cast-in-place concrete piles, but important structure where the ground improvement work itself such as chemical injection is close It may cause the transformation of. In addition, such ground improvement work is very expensive and requires an extra work period. Therefore, there is a demand for the development of an effective construction method that can reliably prevent adverse effects on the surrounding ground without improving the ground by chemical injection.

As a countermeasure, by pressing the casing into the ground so as to cover the hole wall of the excavation hole, the collapse of the hole wall and the accompanying loosening of the supporting ground of the important structure can be suppressed.
However, using a TBH excavator as described in Non-Patent Document 1 and a casing press-fitting device as described in Patent Document 1 in order to suppress hole wall collapse, excavation hole formation and casing press-fitting are alternately performed. In the case of performing the above, it is necessary to alternately set the TBH excavator and the casing press-fitting device at the construction location, and for each set, it is necessary to match the excavation axis and the central axis of the casing (that is, a centering process is necessary) Therefore, the construction process becomes complicated.

  In order to suppress this complication, a pedestal 120 is provided as shown in FIG. 13, and the TBH excavator 101 is disposed on the upper side of the pedestal 120, while the casing press-fitting device 122 for press-fitting the casing 121 is provided as a TBH excavator. When the excavation axis and the central axis of the casing are made to coincide with each other when placed directly under 101, the entire apparatus including the gantry 120 is enlarged, so that it is a narrow place close to a railroad track or the like (for example, It is difficult to install in the vicinity of a railway track as shown in FIG. Even if it can be installed, it takes time and effort to move the entire apparatus.

  In view of such a situation, the present invention has an object of forming a drilling hole and press-fitting a casing with a relatively simple configuration.

Therefore, the excavator according to the present invention is attached to the front side of the swivel body, which includes a vehicle body capable of self-propelling on the ground, and a revolving body provided on the vehicle body so as to be able to turn horizontally. A leader that is supported upright by the body, a rotary head that moves up and down along the leader, and an upper end portion connected to the rotary head, and a lower end portion of the ground with the vertical direction as a rotation axis by a rotational driving force from the rotary head the comprises a rotary drilling device rotating drilling, a casing press-fit device that will be located below the rotating head. The leader is attached to the front side of the swivel body, and is supported by the swivel body so as to stand upright, and a second reader member that is upright with a lower end pivotally supported by an upper end portion of the first reader member. Composed. The casing press-fitting device is attached to the lower end portion of the first leader member. The casing press-fitting device can hold a cylindrical casing covering the hole wall of the excavation hole from the outside and press-fit it into the ground in the vertical direction. The rotary excavator can rotate and excavate the ground while passing through the casing sandwiched between the casing press-fitting devices. When the first leader member is in an upright state and the rotary excavator is separated from the rotary head, the second leader member swivels together with the rotary head around the pivot shaft at the lower end thereof. It can swing to the rear side of the body.

  Further, the method for forming a drilling hole according to the present invention uses the excavator to stop the press-fitting of the casing into the ground by the casing press-fitting device at a predetermined depth, and the drilling hole having a depth greater than the predetermined depth by the muddy water in the drilling hole. The ground is rotated and excavated by a rotary excavator while stabilizing the hole wall.

  According to the present invention, both the rotary excavator and the casing press-fitting device are supported by the base machine, and the rotary excavator rotates and excavates the ground while passing through the casing sandwiched between the casing press-fitting devices. As a result, the rotary excavation in the casing and the press-fitting of the casing can be performed in parallel, so that the press-fitting load of the casing can be greatly reduced compared to the load in press-fitting only the casing. The press-fitting device can be reduced in size. Therefore, since the formation of the drilling hole and the press-fitting of the casing can be performed integrally with a relatively simple configuration, the loosening of the drilling hole is close to an important structure such as an existing railway track. It is possible to efficiently perform cast-in-place concrete piles while securely protecting the hole walls of excavation holes in places where countermeasures are required so as not to have harmful effects such as displacement and deformation on existing structures.

  Further, according to the present invention, the press-fitting of the casing into the ground by the casing press-fitting device is stopped at a predetermined depth, and the ground of the excavation hole having a predetermined depth or more is stabilized by the muddy water in the excavation hole, and the ground by the rotary excavation device. Rotating drilling. Thus, for example, when the predetermined depth is set so as to correspond to a range that requires countermeasures so as not to exert a harmful influence such as displacement or deformation on a neighboring existing structure, the press-fitting of the casing is within the range. However, since the drilling hole can be formed while the hole wall of the drilling hole is stabilized with muddy water, the amount of casing to be used can be reduced, and thus the construction cost can be reduced.

Side view of the excavator according to the first embodiment of the present invention. Diagram showing excavator when traveling on the ground Diagram showing excavator when casing is set The figure which shows the formation method of a drilling hole, and the press-fitting method of a casing The figure which shows the formation method of a drilling hole, and the press-fitting method of a casing Diagram showing the method of construction of cast-in-place concrete piles Diagram showing the construction of cast-in-place concrete piles near railway tracks The top view (A) and side view (B) of the excavator in 2nd Embodiment of this invention Top view (A) and side view (B) of excavator in the third embodiment of the present invention Top view (A) and side view (B) of excavator in the fourth embodiment of the present invention Top view (C) and side view (D) of excavator in the fourth embodiment of the present invention Explanatory drawing showing TBH method The figure which shows the TBH excavator arrange | positioned on a mount frame, and the casing press-fit apparatus arrange | positioned just under it

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiment, the construction of the excavation hole will be described by taking the above-described TBH method as an example, but the construction method of the excavation hole is not limited to this.

FIG. 1 shows a schematic configuration of an excavator when forming excavation holes in the first embodiment of the present invention. FIG. 2 shows the excavator when traveling on the ground. FIG. 3 shows the excavator when the casing is set.
The excavator 1 includes a base machine 2, a columnar reader 3 that is supported upright by the base machine 2, a swivel head (rotating head) 4 that moves up and down along the leader 3, and a rotation that uses the swivel head 4 as a drive source. The excavator 5 includes a casing press-fitting device (power casing jack) 6 that is disposed below the swivel head 4 and supported by the base machine 2.

The base machine 2 includes a vehicle body 21 capable of traveling on the ground, and a revolving body 22 provided on the vehicle body 21 so as to be able to turn horizontally.
The vehicle body 21 includes a vehicle body 23, an endless track 24, and an outrigger 25.

  The endless track 24 is provided on both sides of the vehicle body 23 and is driven to rotate by a driving device (not shown) built in the vehicle body 23. Accordingly, the vehicle body 21 travels on the ground by rotating the endless track 24.

  Two outriggers 25 are provided at each of the front part and the rear part of the vehicle body 23, and are driven by a hydraulic mechanism (not shown) to expand and contract. The outrigger 25 extends and contacts the ground when the excavation hole shown in FIG. 1 is formed, thereby stabilizing the posture of the vehicle body 21. On the other hand, the outrigger 25 is shortened when traveling on the ground shown in FIG.

  The revolving structure 22 is installed on the vehicle body 23. A swivel shaft 26 is connected to the lower portion of the swivel body 22, and the swivel shaft 26 is driven to rotate by a driving device (not shown) built in the vehicle body 23. The turning body 22 turns horizontally by rotating the turning shaft 26.

  The leader 3 includes a first leader member 32 that is pivotally supported on a lower front side of the swing body 22 via a pivot shaft 31, and a second leader member 34 that is pivotally supported on an upper end portion thereof via a pivot shaft 33. It is comprised by. A pinning mechanism (not shown) for fixing the first leader member 32 and the second leader member 34 to each other is provided in the vicinity of the pivot shaft 33. When the pin constituting the pinning mechanism is mounted on the pinning mechanism, the swing of the second leader member 34 with respect to the first leader member 32 around the pivot shaft 33 is limited. On the other hand, when the pin is removed from the pinning mechanism, the second leader member 34 can swing with respect to the first leader member 32 around the pivot shaft 33.

  A support bracket 34 a is provided on the back surface of the second leader member 34, and the support bracket 34 a is connected to a rod 36 of a hydraulic cylinder 35 provided at the front center portion of the revolving structure 22.

  When the excavator 1 travels, as shown in FIG. 2, the rod 36 of the hydraulic cylinder 35 is shortened with the pin mounted on the pinning mechanism. As a result, the entire leader 3 swings around the pivot shaft 31 toward the rear side of the base machine 2 in a state where the first leader member 32 and the second leader member 34 are fixed to each other. In other words, the entire reader 3 tilts toward the rear side of the base machine 2 with the pivot shaft 31 as a support shaft.

  On the other hand, as shown in FIG. 3, when a casing 10 to be described later is set in a casing press-fitting device 6 placed on the ground, the rod 36 of the hydraulic cylinder 35 is removed with the pin removed from the pinning mechanism. Shorten. As a result, the second leader member 34 can be swung with respect to the first leader member 32, so that the second leader member 34 swings toward the rear side of the base machine 2 around the pivot shaft 33 at the lower end thereof. Move. In other words, the second leader member 34 tilts toward the rear side of the base machine 2 with the pivot shaft 33 as a pivot.

  Returning to FIG. 1, the back surface of the swivel head 4 is attached to a slide block 41, and is slidably supported by the reader 3 via the slide block 41. Therefore, the swivel head 4 moves up and down along the leader 3 along with the slide block 41 in front of the leader 3.

The swivel head 4 outputs a rotational driving force using a motor (not shown) as a drive source and having a vertical direction as a rotation axis.
The rotary excavator 5 using the swivel head 4 as a drive source includes a plurality of the reverse rods 103 connected in series in the vertical direction, and the reverse bit 104 provided at the lower end (the most advanced) 103a of the reverse rod 103. Composed. Here, the outer diameter of the reverse bit 104 is smaller than the inner diameter of the casing 10 described later.

  The reverse rod 103 has an upper end 103 b connected to the swivel head 4, and rotates about the vertical direction as a rotation axis by the rotational driving force from the swivel head 4. By this rotation, the reverse bit 104 located at the lower end 103a of the reverse rod 103 rotates and excavates the ground.

  The excavated earth and sand generated by this rotary excavation passes through the inside of the reverse rod 103 from the excavation hole 11 and is sucked into the suction pump 108 together with the stabilizing liquid (muddy water) as in the TBH method explained with reference to FIG. Can be done.

A boom 71 of the auxiliary crane 7 is horizontally attached to the top of the leader 3 so as to protrude from the leader 3 toward the left front of the base machine 2.
Further, a lifting winch 72 of the auxiliary crane 7 is installed at the upper rear end of the revolving structure 22.

  The wire rope 73 drawn out from the winch 72 is stretched over a plurality of guide pulleys 74 of the boom 71 and connected to a hanging tool 75 located below the tip of the boom 71. Therefore, the auxiliary crane 7 can lift a heavy object via the hanger 75 by winding the wire rope 73 with the winch 72.

A casing press-fitting device 6 is detachably attached to the lower end portion of the first leader member 32 of the leader 3 so as to protrude forward of the excavator 1.
A cylindrical casing (steel pipe or the like) 10 is inserted into the central space portion of the casing press-fitting device 6. The casing press-fitting device 6 press-fits the ground 10 in the vertical direction while holding and rotating the casing 10 from the outside.

  Here, the casing press-fitting device 6 is arranged below the swivel head 4 so that the rotation shaft of the swivel head 4 substantially coincides with the central axis (rotation shaft) of the casing 10 press-fitted by the casing press-fitting device 6. Yes.

  As the casing press-fitting device 6, for example, the rotary casing press-fitting device described in Patent Document 1 described above can be used. The casing press-fitting device 6 is not limited to a rotary type but may be a so-called swing type.

  In the case where the casing press-fitting device 6 has the same configuration as the casing press-fitting device described in Patent Document 1 described above, the divided ring (not shown) is contracted by a hydraulic cylinder (not shown) to remove the casing 10. A holding device (not shown) for holding is provided in a rotating body (not shown), and a rotating frame (not shown) that rotatably supports the rotating body while rotating the rotating body by a hydraulic motor (not shown). ) Is lifted and lowered by a thrust cylinder (not shown), so that the casing 10 can be press-fitted (pushed) and pulled out.

  As shown in FIG. 2, the casing press-fitting device 6 can swing up and down around the mounting portion 61 with the first leader member 32 as a swing center. When the excavator 1 travels, both ends of the fixing member 62 (for example, a fixing wire) are placed on the front side surface of the casing press-fitting device 6 and the central side surface of the first leader member 32 with the front side of the casing press-fitting device 6 raised. By fixing, it is possible to avoid contact between the casing press-fitting device 6 and the ground when the excavator 1 is traveling.

  When the casing 10 is set in the casing press-fitting device 6, as shown in FIG. 3, the pin is removed from the pinning mechanism with the swivel head 4 supported by the second leader member 34 of the reader 3, and this state Thus, the rod 36 of the hydraulic cylinder 35 is shortened. Accordingly, the swivel head 4 and the second leader member 34 can swing with respect to the first leader member 32, so that the swivel head 4 and the second leader member 34 have the pivoting shaft 33 as a center. It can swing back. In other words, the swivel head 4 and the second leader member 34 can tilt to the rear side of the base machine 2 with the pivot shaft 33 as a support shaft.

  After the swivel head 4 and the second leader member 34 are tilted to the rear side of the base machine 2, the casing 10 is suspended by the crawler crane 81 and set in the casing press-fitting device 6.

4 and 5 show a method for forming the excavation hole 11 using the excavator 1 and a method for press-fitting the casing 10.
First, as shown in FIG. 4A, the casing 10 is press-fitted with the crawler crane 81 with the swivel head 4 and the second leader member 34 of the excavator 1 tilted to the rear side of the base machine 2. Set in the device 6.

  Next, as shown in FIG. 4 (B), the casing 10 is pressed into the ground by a predetermined depth (for example, to a depth about half the total length of the casing 10) while the casing 10 is rotated by the casing press-fitting device 6. Further, the tilted second leader member 34 is returned to the upright state, and the rotary excavator 5 (the reverse rod 103 and the reverse bit 104) is set on the swivel head 4 of the excavator 1. Here, since the outer diameter of the reverse bit 104 is smaller than the inner diameter of the casing 10, the rotary excavator 5 can be disposed inside the casing 10. Further, when the rotary excavator 5 is set, the rotary shaft of the swivel head 4, the rotary axis of the rotary excavator 5, and the central axis (rotary axis) of the casing 10 are arranged so as to substantially coincide with each other. With the above arrangement, the rotary excavator 5 can rotate and excavate the ground while passing through the casing 10 sandwiched by the casing press-fitting device 6.

  Next, as shown in FIG. 4C, the rotary excavator 5 is rotated by the rotational driving force from the swivel head 4 while the swivel head 4 of the excavator 1 is lowered, and the casing 10 is drilled. To do. Thereby, the excavation hole 11 in which the hole wall is covered with the casing 10 is formed. In parallel with this drilling, the casing press-fitting device 6 press-fits the ground while rotating the casing 10.

  Here, the descending speed of the swivel head 4 is measured by a speed sensor (not shown) installed in the reader 3 in advance, and this measurement data is a control device (not shown) installed in the base machine 2 in advance. Is transmitted to. In this control device, the casing press-fitting device calculates the excavation speed of the rotary excavator 5 according to the measured lowering speed of the swivel head 4 and presses the casing 10 into the ground at a press-fitting speed synchronized with the excavation speed. 6 controls the operation of the thrust cylinder. In this manner, the casing press-fitting device 6 can press-fit the casing 10 into the ground at a press-fitting speed synchronized with the excavation speed of the rotary excavator 5.

  When the swivel head 4 reaches the lower limit of the liftable range, the swivel head 4 of the excavator 1 is then separated and lifted from the reverse rod 103 as shown in FIG. Add a new reverse rod 103 '.

  Next, as shown in FIG. 5E, a new casing 10 is used using a crawler crane 81 in a state where the swivel head 4 and the second leader member 34 of the excavator 1 are tilted to the rear side of the base machine 2. 'Is fixed to the upper end of the casing 10.

  Next, as shown in FIG. 5 (F), while the casings 10 and 10 ′ are rotated by the casing press-fitting device 6, the reverse rod 103 ′ newly added to the ground has a predetermined depth (for example, the casing 10 ′. Press fit) to the extent that it protrudes from the top edge of the

  Next, the tilted second leader member 34 is returned to the upright state, and the rotary excavator 5 (reverse rod 103 ′) is set on the swivel head 4 of the excavator 1. Thereafter, FIG. As shown, the rotary excavator 5 is rotated by the rotational driving force from the swivel head 4 while the swivel head 4 of the excavator 1 is lowered, and the inside of the casing 10 is drilled. In parallel with this drilling, the casing press-fitting device 6 press-fits the ground while rotating the casings 10 and 10 '. Also in this case, the casing press-fitting device 6 can press-fit the casings 10 and 10 ′ into the ground at a press-fitting speed synchronized with the excavation speed of the rotary excavating device 5, as in FIG. 4C described above.

  When the swivel head 4 reaches the lower limit of the range in which the swivel head 4 can move up and down, thereafter, the same steps as in FIGS. 4D to 5G are repeated to obtain a predetermined depth (for example, hole wall protection). The excavation hole 11 is formed and the casing 10 is press-fitted to a required depth).

  When the excavation hole 11 is further drilled after the formation of the excavation hole 11 and the press-fitting of the casing 10 are completed to a predetermined depth (for example, a depth that requires hole wall protection), FIG. ), The operation of the casing press-fitting device 6 is stopped to finish the press-fitting of the casing 10, while new reverse rods 103 'are sequentially added to continue the rotary excavation by the rotary excavator 5 to a desired depth. .

By using the excavator 1 as described above, the casing 10 can be press-fitted in parallel with the formation of the excavation hole 11.
FIG. 6 shows a method for constructing a cast-in-place concrete pile using the excavator 1.

  At the construction site where the formation of the excavation hole 11 and the press-fitting of the casing 10 by the excavator 1 are completed (the center and the left side in FIG. 6), the casing press-fitting device 6 is separated from the excavator 1 and placed on the ground. In this construction place, after a reinforcing bar (not shown) is built in the excavation hole 11, the ready-mixed concrete from the agitator wheel 82 is driven into the excavation hole 11 through the tremy pipe 83. Further, the casing 10 is pulled out by using the crawler crane 81 and the casing press-fitting device 6 according to the progress of the ready-mixed concrete placing work.

  On the other hand, a new casing press-fitting device 6 ′ is attached to the excavator 1 at a construction place (a right side in FIG. 6) where a new excavation hole 13 is formed by the excavator 1 and a new casing 14 is press-fitted. . In this construction place, formation of the excavation hole 13 and press-fitting of the casing 14 are performed in the same manner as the construction method shown in FIGS.

  In this way, by using the plurality of casing press-fitting devices 6 and 6 ', rebar construction, ready-concrete placing work and casing pull-out work are performed in parallel with the excavation hole forming work and the casing press-fitting work. Since it can be performed, the cast-in-place concrete pile can be efficiently constructed.

FIG. 7 shows the construction of a cast-in-place concrete pile near the railroad track.
When constructing a cast-in-place concrete pile near the railroad track 85, the excavator 1 forms the excavation hole 11 and presses the casing 10 into the ground so as to cover the hole wall of the excavation hole 11. In addition, the range (depth) in which the casing 10 is press-fitted is set in consideration of the range where measures should be taken so that the existing existing structures including the track 85 do not have harmful effects such as displacement and deformation. . Here, this set value corresponds to the predetermined depth in the present invention. After the formation of the excavation hole 11 and the press-fitting of the casing 10 is completed, a reinforcing bar is installed in the excavation hole 11 and ready-mixed concrete is placed. A cast-in-place concrete pile is constructed by quickly removing the casing 10 after placing the ready-mixed concrete. As described above, by forming the excavation hole 11 and press-fitting the casing 10 using the excavator 1, it is possible to suppress the collapse of the hole wall of the excavation hole 11 and the accompanying looseness of the support ground of the track 85. Therefore, it is possible to reliably protect the hole wall from collapsing without carrying out hole wall protection work such as ground improvement or steel sheet pile driving before the excavation hole 11 is formed, thereby reducing the construction cost. .

  In addition, the casing press-fitting device 6 applies the casing 10 to the ground within a range that requires countermeasures (predetermined depth in the present invention) so that the press-fitting of the casing 10 does not have harmful effects such as displacement and deformation on the neighboring existing structures. The press-fitting is stopped, and after that, the ground is rotated and excavated by the rotary excavator 5 while the hole wall of the excavation hole 11 is stabilized with a stable liquid such as mud water and bentonite solution in the excavation hole 11 to form the excavation hole 11. Therefore, the construction cost can be reduced by reducing the amount of casing used.

Moreover, when the casing 10 is a steel pipe, a cast-in-place steel pipe concrete pile can also be constructed by leaving the steel pipe.
According to the present embodiment, the excavator 1 includes a base machine 2 constituted by a vehicle body 21 capable of self-propelling on the ground, and a revolving body 22 provided on the vehicle body 21 so as to be capable of horizontal turning, and a revolving body. The reader 3 is supported upright by 22, the swivel head (rotating head) 4 is moved up and down along the reader 3, and the upper end portion is connected to the swivel head 4. A rotary excavator 5 having a lower end rotating and excavating the ground with the direction as a rotation axis, and a casing press-fitting device 6 disposed below the swivel head 4 and supported by the base machine 2 are provided. The casing press-fitting device 6 sandwiches a cylindrical casing 10 covering the hole wall of the excavation hole 11 from the outside and press-fits it into the ground in the vertical direction. The swivel head 4 rotates and excavates the ground while passing through the casing 10 sandwiched by the casing press-fitting device 6. Thereby, since the casing 10 can be press-fitted in parallel with the formation of the excavation hole 11 with a relatively simple configuration, it is possible to efficiently perform the cast-in-place concrete pile.

  According to the present embodiment, the casing press-fitting device 6 is detachably attached to the lower end portion of the reader 3. Accordingly, for example, as shown in FIG. 6, by using a plurality of casing press-fitting devices 6 and 6 ′ at the time of construction of cast-in-place concrete piles, the rebar rods are formed in parallel with the drilling hole forming operation and the casing press-fitting operation. Can be installed, ready-mixed concrete placing work and casing pull-out work can be performed, so that cast-in-place concrete piles can be efficiently constructed.

  Further, according to the present embodiment, the casing press-fitting device 6 is detachably attached to the reader 3 so that the casing press-fitting device 6 can obtain the reaction force of the casing turning force from the reader 3 and the base machine 2. Therefore, the casing 10 can be stably press-fitted into the ground.

  Further, according to the present embodiment, the reader 3 and the casing press-fitting device 6 are attached to the front side of the base machine 2, and the reader 3 is supported by the revolving body 22 and stands upright, and the first reader A second leader member 34 that is vertically supported with a lower end pivotally supported by the upper end of the member. The second leader member 34 is located on the rear side of the base machine 2 with the pivot shaft 33 at the lower end thereof as a center. Can be swung. Accordingly, the swivel head 4 and the second leader member 34 can be tilted to the rear side of the base machine 2 with the pivot shaft 33 as a support shaft, so that a space can be secured above the casing press-fitting device 6. it can.

  Further, according to the present embodiment, the casing press-fitting device 6 press-fits the casing 10 into the ground at a press-fitting speed synchronized with the excavation speed of the rotary excavator 5. Thereby, since the press-fitting into the ground of the casing 10 is sequentially performed in parallel with the excavation of the rotary excavation device 5, the hole wall of the excavation hole 11 can be quickly protected according to the excavation.

  Moreover, according to this embodiment, the excavator 1 is used to stop the press-fitting of the casing 10 into the ground by the casing press-fitting device 6 at a predetermined depth, and the muddy water (stabilized liquid) in the excavation hole 11 is deeper than the predetermined depth. The ground is rotated and excavated by the rotary excavator 5 while stabilizing the hole wall of the excavation hole 11. As a result, the press-fitting of the casing 10 is limited to a range (predetermined depth) that requires measures to prevent harmful effects such as displacement and deformation from being exerted on nearby existing structures. Since the excavation hole 11 can be formed while the hole wall of 11 is stabilized, the amount of casing to be used can be reduced, and thus the construction cost can be reduced.

  In this embodiment, the press-fitting of the casing 10 into the ground is preceded by the excavation by the rotary excavator 5, but when the ground is relatively hard and difficult to collapse, the excavation by the rotary excavator 5 is performed. It is possible to precede the press-fitting of the casing 10 into the ground. In this case, the casing 10 is press-fitted into the ground so as to cut the surface of the hole wall of the excavation hole 11 formed by the rotary excavation device 5 to protect the hole wall of the excavation hole 11.

FIG. 8 shows a schematic configuration of the excavator 1 in the second embodiment of the present invention.
A different point from 1st Embodiment shown in FIGS. 1-3 is demonstrated.
A slide block 41 attached to the back surface of the swivel head 4 is slidably supported by the reader 3 via a hinge mechanism (not shown). The hinge mechanism horizontally swings the slide block 41 and the swivel head 4 with the longitudinal direction of the reader 3 as a turning axis. Therefore, the hinge mechanism realizes a function as a rotating head turning mechanism in the present invention.

In addition, the base 71 of the boom 71 of the auxiliary crane 7 is pivotally supported on the top of the reader 3, and the auxiliary crane 7 can be horizontally swiveled around the pivot shaft 77.
When the casing 10 is set in the casing press-fitting device 6, instead of tilting the swivel head 4 and the second leader member 34 to the rear side of the base machine 2, the slide block 41 and the swivel head 4 are connected via the hinge mechanism. A space is secured above the casing press-fitting device 6 by horizontally turning from the front center of the excavator 1 to the front right side (see the broken line arrow in FIG. 8A). Then, the auxiliary crane 7 that lifts the casing 10 pivots horizontally from the left side of the excavator 1 to the front center around the pivot shaft 77 (see the white arrow in FIG. 8A), and the casing 10 is casing. It is suspended in the central space of the press-fitting device 6.

  In particular, according to the present embodiment, a hinge mechanism (rotating head turning mechanism) for horizontally turning the slide block 41 and the swivel head 4 with the longitudinal direction of the reader 3 as a turning axis is provided. Thereby, a space can be secured above the casing press-fitting device 6 without tilting the swivel head 4 and the second leader member 34 to the rear side of the base machine 2.

  Further, according to the present embodiment, the base end portion is pivotally supported on the top portion (upper portion) of the reader 3, and the auxiliary crane 7 that can be turned horizontally around the pivot shaft 77 of the base end portion is provided. Thereby, the casing 10 can be suspended without using the crawler crane 81 or the like.

FIG. 9 shows a schematic configuration of the excavator 1 in the third embodiment of the present invention.
A different point from 1st Embodiment shown in FIGS. 1-3 is demonstrated.
In the third embodiment, the casing press-fitting device 6 is detachably attached to the vehicle body 21 (vehicle body 23) below the reader 3 instead of being detachably attached to the lower end portion of the first leader member 32 of the reader 3. Projecting forward from the excavator 1.

  When the casing 10 is set in the casing press-fitting device 6, first, instead of tilting the swivel head 4 and the second leader member 34 to the rear side of the base machine 2, the swivel body 22 is swung horizontally (FIG. 9). A space is secured above the casing press-fitting device 6. Then, the casing 10 is suspended by the crawler crane 81 and set in the casing press-fitting device 6. In FIG. 9, the casing 10 suspended by the crawler crane 81 is added onto the existing casing 10 in the casing press-fitting device 6, so that the setting to the casing press-fitting device 6 is performed indirectly. .

  In particular, according to the present embodiment, the casing press-fitting device 6 is detachably attached to the vehicle body 21. Accordingly, it is possible to secure a space above the casing press-fitting device 6 only by horizontally turning the swivel body 22 without tilting the swivel head 4 and the second leader member 34 to the rear side of the base machine 2.

  Further, according to the present embodiment, since the casing press-fitting device 6 is detachably attached to the vehicle body 21, the casing press-fitting device 6 can obtain the reaction force of the casing turning force from the vehicle body 21, so that the casing The press-fitting into 10 grounds can be performed stably.

  As a countermeasure when the ground is hard or the like and it is necessary to reinforce the reaction force when the casing is press-fitted, a method of reinforcing the reaction force by placing a weight (not shown) on the casing press-fitting device 6 A method of driving a reaction force pile (not shown) on the ground using the rotational driving force by the swivel head 4 and reinforcing the reaction force via the reaction force pile can be mentioned. In the latter method, in order to reinforce the reaction force in the turning (horizontal) direction at the time of casing press-fitting, for example, a reaction force pile is placed at an arbitrary place on the ground, and the reaction force pile and the vehicle body 21 of the base machine 2 Are connected by a fixing jig (not shown) to reinforce the reaction force in the turning (horizontal) direction. Further, when reinforcing the reaction force in the vertical direction at the time of casing press-fitting, for example, the vehicle body 21 of the base machine 2 and the casing press-fitting device 6 are once separated and a reaction force pile is placed in the vicinity of the casing press-fitting device 6. The reaction force pile and the casing press-fitting device 6 are connected by a fixing jig (not shown) to reinforce the reaction force in the vertical direction.

10 and 11 show a schematic configuration of the excavator 1 in the fourth embodiment of the present invention.
Differences from the third embodiment shown in FIG. 9 will be described.
A cylindrical casing 10 is constituted by two casing members 15 having an arcuate cross section.

  When the casing 10 (casing member 15) is set in the casing press-fitting device 6, first, as shown in FIG. 10, a space is secured above the casing press-fitting device 6 by turning the swivel body 22 horizontally to the left. . Then, the casing member 15 is lifted by the auxiliary crane 7. Next, as shown in FIG. 11, the swivel body 22 is swung horizontally to the right, and the casing member 15 is suspended on the existing casing 10 in the casing press-fitting device 6. Then, the casing member 15 is connected to the upper end portion of the existing casing 10.

  In particular, according to the present embodiment, the cylindrical casing 10 is configured by a plurality of (for example, two) casing members 15 having an arcuate cross section. As a result, the casing member 15 can be sequentially transported and assembled on the existing casing 10 in the casing press-fitting device 6 by using the auxiliary crane 7, and the casing 10 can be added. The casing can be press-fitted with a relatively simple configuration.

  In the above-described embodiment, the vehicle body 21 of the base machine 2 includes the endless track 24. However, the configuration of the vehicle body 21 is not limited to this. You may comprise including a wheel.

  In the above-described embodiment, the rotary excavator 5 includes the reverse rod 103 and the reverse bit 104, but the rotary excavator 5 has a lower end portion with the vertical direction as the rotation axis by the rotational driving force from the swivel head 4. However, the rotary excavator 5 may be an auger screw, for example.

1 Excavator 2 Base Machine 3 Leader 4 Swivel Head (Rotating Head)
DESCRIPTION OF SYMBOLS 5 Rotating excavator 6, 6 'Casing press-fit apparatus 7 Auxiliary crane 10, 10' Casing 11 Excavating hole 13 Excavating hole 14 Casing member 21 Car body 22 Turning body 23 Car body 24 Endless track 25 Outrigger 26 Turning axis 31 Pivoting axis 32 first leader member 33 pivot shaft 34 second leader member 34a support bracket 35 hydraulic cylinder 36 rod 41 slide block 61 mounting portion 62 fixing member 71 boom 72 winch 73 wire rope 74 guide pulley 75 hanging tool 77 pivot shaft 81 crawler Crane 82 Agitator wheel 83 Tremy tube 85 Track 101 TBH excavator 102 Swivel head 103, 103 'Reverse rod 104 Reverse bit 105 Stabilizing liquid tank 106 Sand pump 107 Excavation hole 108 Suction pump 109 Primary Clean 110 secondary screens 111 cyclone screen 112 surplus soil tank 120 pedestal 121 casing 122 housing indentation device

Claims (6)

An excavator that excavates the ground in the vertical direction to form an excavation hole,
A base machine composed of a vehicle body capable of self-propelled on the ground, and a revolving body provided on the vehicle body so as to be horizontally rotatable
A reader attached to the front side of the swivel body and supported upright by the swivel body;
A rotating head that moves up and down along the reader;
A rotary excavator having an upper end connected to the rotary head, and the lower end rotating and excavating the ground with the vertical direction as a rotation axis by a rotational driving force from the rotary head;
A casing press-fitting device that will be located below the rotating head,
With
The leader is attached to the front side of the swivel body, is supported by the swivel body and stands upright, and a second leader member that is upright with a lower end pivotally supported by the upper end portion of the first reader member. And
The casing press-fitting device is attached to a lower end portion of the first reader member,
The casing press-fitting device is capable of sandwiching a cylindrical casing covering the hole wall of the excavation hole from the outside, and press-fitting into the ground in the vertical direction ,
The rotary excavator is capable of rotating and excavating the ground while passing through the casing sandwiched by the casing press-fitting device ,
In the state where the first leader member is upright and the rotary excavator is separated from the rotary head, the second leader member is centered on the pivot shaft at the lower end thereof. An excavator capable of swinging together with the rotating head to the rear side of the revolving structure . Prior to setting a new casing in the casing press-fitting device, the second leader member is in an upright state and the rotary excavator is separated from the rotary head. 2. The excavator according to claim 1, wherein the leader member is swingable to the rear side of the swivel body together with the rotary head around a pivot shaft at a lower end portion thereof. Prior to adding the new casing to the existing casing, the second leader member is in an upright state and the rotary excavator is separated from the rotary head. 2. The excavator according to claim 1, wherein the leader member is swingable to the rear side of the swivel body together with the rotary head around a pivot shaft at a lower end portion thereof. The excavation according to any one of claims 1 to 3 , further comprising an auxiliary crane pivotally supported on an upper portion of the leader and horizontally pivotable about a pivot shaft of the proximal end. Machine. The excavation according to any one of claims 1 to 4 , wherein the casing press-fitting device is capable of press-fitting the casing into the ground at a press-fitting speed synchronized with the excavation speed of the rotary excavator. Machine. Using the excavator according to any one of claims 1 to 5 ,
Stop the press-fitting into the ground of the casing by the casing press-fitting device at a predetermined depth,
The ground is rotated and excavated by the rotary excavator while stabilizing the hole wall of the excavation hole having a depth greater than or equal to the predetermined depth by the muddy water in the excavation hole .
The method of forming the drilling drilling.