JP6152040B2 - Rotary table device for rotary excavator and construction method of pile foundation - Google Patents

Description

  The present invention relates to a rotary table device for a rotary excavator and a method for constructing a pile foundation. More specifically, in the construction of a pile foundation that uses a single crane, the rotary table is moved to the next pile hole excavation site after the pile hole excavation work has been completed. While moving the table, it is possible to improve the work efficiency in the construction of the pile foundation by making it possible to bury the ready-made pile in the previously excavated pile hole using a crane. About things.

  The present inventor has already proposed a rotary table for a rotary excavator in Patent Document 1 and others. This rotary table supports a rotary excavator composed of an excavator body and a plurality of joint members in a vertically standing state, and rotates this to excavate a pile hole in the ground. After excavating a pile hole in the ground, a prefabricated pile such as H-shaped steel or concrete pile is buried in the pile hole, and a pile foundation including a large number of buried piles in the ground is constructed.

  When forming multiple pile holes for constructing a pile foundation in the ground, after excavating the first pile hole using a rotary table and a rotary excavator, the rotary table and rotary excavator are The second pile hole is excavated at this location. A plurality of pile holes are formed in the ground by sequentially repeating such operations. Conventionally, the construction of the pile foundation that is performed by moving the rotary table and the rotary excavator one after another as described above has been performed in the following procedure.

(1) After the first pile hole is formed, the rotary excavator is lifted using a crane and pulled out from the pile hole, and the rotary excavator is further removed from the rotary table so that it does not get in the way. Move it to the location and defeat it.
(2) Next, using the same crane, this time the rotary table is lifted, and the second pile hole is moved to the location to be excavated and installed on the ground.

(3) Using the same crane, lift the rotary excavator again, stand the second pile hole through the rotary drive of the rotary table installed at the location where excavation is done, rotate the rotary excavator Drill a second pile hole. Repeat the above procedure to form the required number of pile holes.
(4) After excavating the pile hole in the ground, use the same crane to suspend the ready-made pile in the pile hole, bury the ready-made pile and construct the pile foundation in the ground.

JP 2010-196379 A

However, the conventional rotary table for rotary excavators has the following problems.
That is, the rotary table is heavy and stationary, and a crane is required for its movement. Therefore, after using the crane as described above and forming the previous pile hole, the rotary table is moved to the location where the next pile hole is excavated using the same crane. For this reason, while moving the rotary table, it was not possible to suspend and bury the ready-made pile in the pile hole using a crane.

  For this reason, it cannot be said that the construction work of the above-mentioned pile foundation has good work efficiency, and it was difficult to shorten the construction period. In addition, as a countermeasure, two cranes are prepared at the site, each work is shared by each crane, and work efficiency is improved by creating time to perform the work in parallel. It is possible to shorten the construction period. However, there are many cases where it is not possible to secure a space that can use two cranes at the site of construction work for pile foundations, so use of a single crane should shorten the construction period of construction work for pile foundations. Was desired.

  The present invention was devised in view of the above points, and in the construction of a pile foundation using a single crane, after the excavation work of the previous pile hole is completed, the excavation of the next pile hole is performed. When moving the rotary table to a location, a crane is not required, and the crane can be used to bury the ready-made pile in the previously excavated pile hole while moving the rotary table. An object of the present invention is to provide a rotary table device for a rotary excavator and a method for constructing a pile foundation that can improve the work efficiency of the construction work of the pile foundation and shorten the construction period.

(1) The present invention includes a table base, a rotary drive unit that is provided on the table base and rotates while holding the rotary excavator up and down in a vertical state, and a travel unit having travel wheels driven by a prime mover. And a rotary table device for a rotary excavator comprising a rotary table having an outrigger provided on the table base, and a track portion on which the rotary table travels by the travel unit.

(2) The present invention may have a configuration having guide means for allowing the rotary table to travel along the direction of the track portion.

  In this case, since the movement of the rotary table in the lateral direction can be suppressed by the guide means, the alignment between the center of the excavator body and the center of the planned excavation site of the pile hole is the direction of the track portion. If it is set so that the rotary table can be moved to the excavation position of the next pile hole on the track portion, it is only necessary to pay attention to the alignment in the moving direction. Therefore, it is easy to align the rotary table and the excavation site, and it takes a short time. Therefore, the construction period of the pile foundation construction can be shortened.

(3) The present invention is the invention of the above (2), wherein the raceway portion is an H-shaped steel in which two flanges are arranged in parallel, and two are arranged in parallel, and the guide means is It is good also as a structure which has a fitting tool slidably fitted to the edge part of the flange of both H-shaped steel from the outside in the length direction.

  In this case, since the fitting tool is slidably fitted into the edge of the flanges of both H-shaped steels from the outside in the longitudinal direction, the lateral movement with respect to the traveling direction of the rotary table can be suppressed. As described in (3) above, the alignment work between the rotary table and the excavation site can be easily performed.

(4) The present invention includes a table base, a rotary drive unit that is provided on the table base and rotates while holding the rotary excavator up and down in a vertical state, and a travel unit having travel wheels driven by a prime mover. A rotary table device for a rotary excavator, comprising: a rotary table having a rotary table, and a track portion on which the rotary table can travel by the traveling unit.

(5) In the present invention, the rotary table is fixed to the excavation position of the first pile hole on the track portion, and the rotary excavator is passed through the rotary drive unit of the rotary table using a crane. Rotating the excavator and excavating a first pile hole in the ground; lifting the rotary excavator with the crane and extracting the rotary pile from the first pile hole and the rotary drive of the rotary table; Moving the rotary table to the excavation position of the second pile hole by self-propelling on the track portion, and fixing the rotary table to the excavation position of the second pile hole; Suspending the ready-made pile in the first pile hole and burying it with the crane so that the time and the time overlap with each other, and passing the rotary excavator through the rotary drive part of the rotary table with the crane It said rotary excavator is rotated, a method of constructing the pile foundation and a step of drilling a second Kuiana the ground.

  The term “track portion” in the present specification and claims is used to include various rails made of metal in addition to H-shaped steel. In addition, the length of the track portion is not particularly limited. For example, the length of the track portion can be set to a length that allows excavation of two locations of the first pile hole and the second pile hole. It can also be set to a length that allows excavation at three or more locations.

(Function)
The operation of the rotary table device for a rotary excavator of the present invention will be described.
The rotary table device for a rotary excavator first installs a track part on the ground where the pile foundation is to be constructed, and then places the rotary table on the track part so that the travel part can travel, It is located at the excavation position of the first pile hole.

  Then, the outrigger is actuated at this position, and the legs are lowered onto the upper surface of the track portion and the rotary table is substantially fixed. The direction of the track portion is set so that it can be moved to the next excavation position of the second pile hole by moving the rotary table on the track portion.

A single crane is used for the following operations.
Using a crane, lift the rotary excavator and pass it through the rotary drive of the rotary table, rotate the rotary excavator in the vertical direction and rotate in the axial direction to excavate the first pile hole in the ground .
When the excavation of the first pile hole is completed, the rotary excavator is lifted with a crane, pulled out from the first pile hole and the rotary table, moved to a safe place where it does not get in the way, and brought down. Then, the crane's suspension wire is replaced with a ready-made pile.

  After lifting the leg of the outrigger to release the fixing, the traveling part is driven, and the rotary table is self-propelled on the track part and moved to the excavation position of the second pile hole. Specifically, the center of the rotary drive of the rotary table is set to the point to be excavated. Then, the outrigger is actuated at this position, and the legs are lowered onto the upper surface of the track portion and the rotary table is substantially fixed.

  Move the rotary table to the excavation position of the second pile hole, and install and fix it at that position so that the time overlaps with the first pile hole excavated previously with a crane. Suspend and store, and then bury the concrete inside the pile hole. In addition, after suspending a ready-made pile in a pile hole, the suspension wire of a crane is replaced with a rotary excavator, and it lifts and moves to the rotary table in the excavation position of a 2nd pile hole.

  Thus, since the rotary table can be self-propelled on the track and moved to the excavation position of the second pile hole, it is not necessary to use a crane for moving the rotary table. Therefore, other operations that cannot be performed without using a crane, such as, for example, placing a ready-made pile immediately after excavation into a previously excavated pile hole, can be performed concurrently with the movement of the rotary table.

  Thereby, in the construction of the pile foundation, the work efficiency when only one crane is used is improved, and the construction period can be shortened compared to the conventional case. Moreover, by placing ready-made piles in the previously excavated pile hole immediately after excavation, the pile wall can be buried while the inner wall of the pile hole is less likely to collapse. This also has the advantage of preventing stagnation of pile foundation construction.

And after the burial work of the pile in the first pile hole is completed, or in parallel with the burial work of the ready-made pile after use of the crane, the rotary excavator is passed through the rotary drive part of the rotary table with the crane, The rotary excavator is rotated in the axial direction in a state where the rotary excavator is set up in the vertical direction, and the second pile hole is excavated in the ground. After completion of excavation of the second pile hole, the track part is moved to the next excavation site with a crane and installed on the ground, and the ready-made pile is suspended and suspended in the second pile hole by a crane.
Thereafter, a pile foundation including a large number of buried piles can be constructed by repeating the above procedure.

  The present invention eliminates the need for a crane when moving the rotary table to the excavation site of the next pile hole after the completion of excavation work of the previous pile hole in the construction of the pile foundation performed using one crane. While moving the rotary table, the construction work of the pile foundation can be improved by making it possible to embed the pre-made pile in the previously excavated pile hole using a crane. In addition, it is possible to provide a rotary table device for a rotary excavator and a method for constructing a pile foundation that can shorten the construction period.

1 is a rear perspective view showing an embodiment of a rotary table device for a rotary excavator of the present invention. It is a front view perspective view of the rotary table apparatus for rotary excavators shown in FIG. It is a top view of the rotary table apparatus for rotary excavators shown in FIG. It is side view explanatory drawing of the rotary table apparatus for rotary excavators shown in FIG. It is AA cross-section explanatory drawing in FIG. It is explanatory drawing which shows the use condition of the rotary table apparatus for rotary excavators, and shows the state which is excavating a pile hole with a rotary excavator using a crane. It is explanatory drawing which shows the state which has extracted the rotary excavator from the pile hole using the crane. The rotary excavator extracted from the pile hole using a crane is moved to another location and the rotary table device for the rotary excavator is moved to the excavation point of the next pile hole by self-propelled. It is explanatory drawing. It is explanatory drawing which shows the state which has suspended the concrete pile to the pile hole using the crane. It is explanatory drawing which shows the state which embeds the ready-made pile to the pile hole excavated previously, and excavates the next pile hole with a rotary excavator using a crane.

The present invention will be described in detail based on the embodiments shown in the drawings.
Please refer to FIG. 1 to FIG. In the following description, the terms “front and rear” and “left and right” may be used to indicate the location and direction. In FIG. 3, the right side is “front” and the left side is “rear”. ", The upper side corresponds to" right ", and the lower side corresponds to" left ".

The rotary excavator rotary table device T includes a rotary table 1 and a track portion 2.
First, the track portion 2 has a structure in which an H-shaped steel is framed, and has two track members 20 and 21 arranged side by side. The track members 20 and 21 are arranged in parallel with both flanges in the vertical position. The track members 20 and 21 are connected by connecting members 22 and 23 fixed to the lower side near both ends in the length direction. A fitting recess 138 of the fitting 13 provided on the rotary table 1 described later is slidably fitted into the flange edges 200 and 210 on the outer side of the upper flanges of the track members 20 and 21.

  The space | interval of the track members 20 and 21 is set so that the driving wheel 154 and 154a and the driven wheel 165 and 165a which comprise the driving | running | working part 15 of the rotary table 1 mentioned later can be mounted. The length of the track members 20 and 21 is set to a length that allows the rotary table 1 to be fixed on at least two pile hole excavation points on the track members 20 and 21. The length of the track members 20 and 21 can also be set to a length that allows excavation of three or more pile holes by one installation of the track portion 2. Moreover, the height of the track members 20 and 21 can also be set as appropriate.

  The rotary table 1 placed on the track portion 2 has a table base 10 whose outer shape is formed in a substantially square shape in plan view. A rotation drive unit 17 is provided on the inner side of the table base 10 slightly toward the rear. The rotation drive unit 17 can rotate the rotary excavator 3 while holding it up and down in a vertical state.

  The rotation drive unit 17 has a base 170 having a square shape in plan view. The board | substrate 170 has the rotary body 171 in the center part. A rotating bush 172 is mounted on the rotating body 171 so as to pass through the center hole (not shown) of the rotating body 171 in the vertical direction. The inner diameter of the center hole is slightly larger than the main body 30 of the rotary excavator 3.

  The rotating bush 172 is detachable from the rotating body 171, and can rotate integrally with the rotating body 171 in a mounted state. Further, by removing the rotating bush 172 from the rotating body 171, the main body 30 of the rotary excavator 3 can be passed through the center hole of the rotating body 171.

  On the front side of the base 170, two hydraulic motors 173 and 174, which are prime movers, are juxtaposed and mounted. Of the hydraulic motors 173 and 174, the power of one hydraulic motor 173 is transmitted to the rotating body 171 via a gear (not shown), and the rotating body 171 is rotated. Further, the inner diameter of the cylindrical portion 175 of the rotary bush 172 is formed to be slightly larger than the joint member 31 connected to the main body 30 of the rotary excavator 3, and the joint member 31 can be passed therethrough. In addition, on the inner peripheral wall of the cylindrical portion 175, engagement grooves 176 that engage with the strips 32 formed on the joint member 31 are formed in the vertical direction at four locations at equal intervals in the circumferential direction.

  Step plates 11 on which the operator can place his / her feet are fixed at a total of three locations on the rear side and the left and right sides of the outer surface of the table base 10. An outrigger 12 is provided on the table base 10. The outrigger 12 is composed of telescopic leg devices 120, 121, 122, 123 formed at the four corners of the table base 10.

  Each telescopic leg device 120, 121, 122, 123 has a structure including a hydraulic cylinder (not shown) built in a case 124 provided in a vertical direction with the rod facing downward, and a leg 125 fixed to the rod. . The telescopic leg devices 120, 121, 122, and 123 operate in synchronization with each other and can substantially fix the rotary table 1 at a predetermined position by extending and supporting the legs 125 with the same length.

  The rotary table 1 has a traveling unit 15 provided on a table base 10. The traveling unit 15 is driven by the other hydraulic motor 174 of the two hydraulic motors 173 and 174. The power of the hydraulic motor 174 is transmitted to the drive shafts 152, 152a that protrude from the gear box 151 provided at the front portion of the table base 10 to the left and right sides.

  In addition, vehicle bearings 153 and 153a are fixed to the left and right sides of the front surface of the table base 10 (the front side of the telescopic leg devices 120 and 121) so as to protrude forward. Metal roller-like drive wheels 154 and 154a are axially supported via axles 155 and 155a at the front ends of the respective vehicle bearings 153 and 153a. The driven shafts 155, 155a and the drive shafts 152, 152a are interlocked by drive shafts 156, 156a connected via universal joints 157, 157a.

  On the other hand, U-shaped brackets 158 and 158a in a plan view are fixed to the left and right sides of the rear surface of the table base 10 (the rear side of the telescopic leg devices 122 and 123) so as to protrude rearward. Each of the bearing plates (reference numerals omitted) of the brackets 158 and 158a has holes formed at three locations. Bearing tools 162 and 162a are attached to a middle shaft hole 159 among the holes through a shaft 163 so as to be rotatable in the vertical direction.

  Further, among the above holes, a stopper pin 164 is passed through the upper through hole 160 and the lower through hole 161. On the bearings 162 and 162a, metal roller-like driven wheels 165 and 165a are pivotally supported via an axle 166 so as to be idled. A pin hole 167 (see FIG. 1) is formed adjacent to the driven wheels 165 and 165a side of the shaft 163 on the base side of the bearings 162 and 162a.

  In order to allow the rotary table 1 to travel on the track portion 2, the bearings 162 and 162a are rotated downward, and the lower through holes 161 and the bearings 162 of the respective bearing plates of the brackets 158 and 158a. , The pin holes 167 of 162a are aligned and the fixing pin 164 is mounted and fixed. Accordingly, the lower surfaces of the driven wheels 165 and 165a are lower than the bottom surface of the table base 10, and the vehicle can run freely. In some cases, the bearings 162 and 162a can be moved up and rotated, and the through hole 160 and the pin hole 167 can be combined and stopped by the stop pin 164.

  Further, fitting tools 13 are attached to the outer surfaces of the table base 10 on the front and rear sides of the respective step plates 11 on the left and right sides of the table base 10. Each fitting 13 comprises a guide means with the edge of the flange of the track members 20 and 21 which are H-shaped steel. The fitting 13 has a mounting plate 130 having a U-shaped cross section. The mounting plate 130 has parallel bearing plates (reference numerals omitted), and holes are formed in the bearing plates at three locations, respectively.

  A fitting member 136 described later is attached to the middle shaft hole 133 among the holes through a shaft 137 so as to be rotatable in the vertical direction. A stop pin 140 is passed through the upper through hole 134 and the lower through hole 135 among the holes, as will be described later. In the fitting member 136, a fitting recess 138 is formed on the inner side near the tip, and a pin hole 139 (see FIG. 1) is formed adjacent to the fitting recess 138 side of the shaft 137 on the base side. Yes.

  When the rotary table 1 is mounted on the track portion 2, the fitting tool 13 rotates the fitting member 136 downward, and the lower holes 135 of the bearing plates 131 and 132 and the pin holes 139 of the fitting member 136. Are attached and fixed with the fixing pin 140. As a result, the fitting recess 138 is fitted into the edge of the flange of the track members 20 and 21 so as to be slidable in the length direction from the outside.

  Further, when the rotary table 1 is removed from the raceway portion 2, the retaining pin 140 is removed from the above state, the fitting member 136 is raised and rotated, and the upper through holes 134 of the bearing plates 131 and 132 and the pins of the fitting member 136 are removed. The fixing pins 140 are attached and fixed with the holes 139 aligned (see FIG. 5). As a result, the rotary table 1 can be separated from the track portion 2.

(Function)
With reference to FIGS. 1 to 10 (mainly FIGS. 6 to 10), the operation of the rotary excavator rotary table device T will be described.
(1) The rotary table apparatus T for rotary excavators first installs the track portion 2 on the ground 9 where the pile foundation is to be constructed. The direction of the track members 20 and 21 can be moved to the next excavation position 910 (see FIGS. 7 to 9) of the second pile hole by moving the rotary table 1 on the track members 20 and 21. Is set.

(2) Next, the rotary table 1 is placed on the track members 20 and 21 of the track portion 2 so as to be able to travel with the drive wheels 154 and 154a and the driven wheels 165 and 165a of the travel portion 15, and the rotary table 1 is mounted. It is located at the excavation position of the first pile hole. Then, the outrigger 12 is operated at this position, and the legs 125 are lowered on the upper surfaces of the track members 20 and 21 to lift the driving wheels 154 and 154a and the driven wheels 165 and 165a from the track members 20 and 21 (the driven wheels 165 and 165a are The rotary table 1 is substantially fixed (see FIG. 6).

(3) The following operations are performed using one crane 4. Using the crane 4, the rotary excavator 3 is lifted by the suspension wire 41 with the suspension wire 40 lowered to the tip of the arm 44, passed through the rotation drive unit 17 of the rotary table 1, and the rotation drive unit 17 is driven to rotate. The first excavator 3 is rotated in the axial direction with the vertical excavator 3 standing in the vertical direction, and the first pile hole 90 is excavated in the ground 9. Compressed air is supplied to the rotary excavator 3 through an air supply pipe 42 from a compressor (not shown), and a pile hole 90 is formed by striking with a bit 33 at the tip and scraping with a plurality of protrusions 34 at the outer periphery. Can be excavated.

(4) When excavation of the first pile hole 90 is completed, the rotary excavator 3 is lifted by the crane 4 and extracted from the first pile hole 90 and the rotary table 1 (see FIG. 7), and a safe place that does not get in the way. Move to and defeat. At this time, the rotating bush 172 is detached from the rotating body 171 while being caught by the main body 30 (see FIG. 8). Then, the hanging wire 40 of the crane 4 is replaced with the concrete pile 5 which is a ready-made pile. The ready-made pile may use other forms such as H-shaped steel. In addition, the thing used according to the kind of ready-made pile is used for the hanging tool 45 (refer FIG. 9) of the suspension wire 40 front-end | tip.

(5) After the legs 125 of the outrigger 12 are lifted to release the fixing, the fitting member 136 of the fitting 13 is turned down to fit the fitting recess 138 to the flange edges 200 and 210 slidably. Include. And the driving | running | working part 15 is driven, the rotary table 1 is self-propelled on the track members 20 and 21 of the track part 2, and is moved to the excavation position 910 of the 2nd pile hole. The rotary table 1 is smoothly guided by the fitting tool 13 serving as guide means and the flange edges 200 and 210. Specifically, the center of the rotary drive unit 17 of the rotary table 1 is adjusted to the point (or center) for excavation, but this operation is performed only by adjusting the position of the rotary table 1 on the track members 20 and 21 in the traveling direction. It can be done easily. At this position, the fitting member 136 of the fitting 13 is raised and rotated to release the fitting state with the flange edges 200 and 210 (see FIG. 10). 21. The leg 125 is lowered onto the upper surface, and the rotary table 1 is substantially fixed.

(6) The time when the rotary table 1 is moved to the excavation position 910 of the second pile hole, the time when the rotary table 1 is installed and fixed at that position, and the time when the concrete pile 5 is excavated first are overlapped. The pile 4 is suspended by the crane 4 and accommodated, and the concrete 50 is buried in the pile hole 90 by hitting it or the like (see FIGS. 9 and 10). After the concrete pile 5 is suspended in the pile hole 90, the suspension wire 40 of the crane 4 is replaced with the rotary excavator 3 and lifted to the rotary table 1 at the excavation position 910 of the second pile hole. Move.

  In this way, the rotary table 1 can be moved on the track members 20 and 21 of the track portion 2 and moved from the excavation position of the first pile hole 90 to the excavation position 910 of the second pile hole ( 8), it is not necessary to use the crane 4 for the movement of the rotary table 1. Therefore, other operations that cannot be performed without using the crane 4, such as the operation of inserting the concrete pile 5 into the pile hole 90 excavated earlier, can be performed simultaneously with the movement of the rotary table 1.

  Thereby, in the construction of the pile foundation, the work efficiency when only one crane 4 is used is improved, and the construction period can be shortened compared to the conventional case. Moreover, since the concrete pile 5 can be buried while the inner wall of the pile hole 90 is less likely to collapse by inserting the concrete pile 5 immediately after excavation into the pile hole 90 excavated earlier, There is also an advantage that the construction of the pile foundation can be prevented from stagnation due to the collapse of the inner wall of the hole 90.

(7) After the burying work of the concrete pile 5 in the first pile hole 90 is completed or simultaneously with the burying work of the concrete pile 5 after using the crane 4, the rotary excavator 3 is rotated by the crane 4. The rotary drive unit 17 is driven through the rotary drive unit 17 of the table 1 to rotate the rotary excavator 3 in the vertical direction and rotate in the axial circumferential direction, thereby excavating the second pile hole 91 in the ground 9. (See FIG. 10). After completion of the excavation of the second pile hole 91, the track part 2 is moved to the next excavation site with the crane 4 and installed on the ground 9, and the concrete pile 5 is suspended by the crane 4 in the second pile hole 91, Perform burial work.

  Thereafter, a pile foundation including a large number of buried piles can be constructed by repeating the above procedure. In the case where the pile foundation is constructed by laying the piles 5 in a row, for example, a track part 2 is connected to the track part 2 in order, or a part of the front part side of the track part previously installed. Is removed and connected to the rear side, and when the rotary table 1 is moved, the track portion is extended by repeating this, so that the lifting and lifting work using the crane 4 of the rotary table 1 is started. This is not necessary except at the end, and the burden on the crane can be reduced. Therefore, there is an advantage that work can be performed with a smaller crane.

  The terms and expressions used in this specification are merely explanatory and are not limiting at all, and exclude terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to do. Further, it goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

T Rotary table device 1 for rotary excavator 1 Rotary table 10 Table base 11 Step plate 12 Outrigger 120, 121, 122, 123 Telescopic leg device 124 Case 125 Leg 13 Fitting tool 130 Mounting plate 131, 132 Bearing plate 133 Shaft hole 134 Through hole 135 Through hole 136 Fitting member 137 Shaft 138 Fitting recess 139 Pin hole 140 Stop pin 15 Traveling portion 151 Gear box 152, 152a Drive shaft 153, 153a Car bearing 154, 154a Drive wheel 155, 155a Axle 156, 156a Drive Shaft 157, 157a Universal joint 158, 158a Bracket 159 Shaft hole 160 Through hole 161 Through hole 162, 162a Bearing 163 Shaft 164 Stop pin 165, 165a Driven wheel 166 Axle 167 Pin hole 17 Rotation drive part 170 Base 171 Rotation Body 172 Rotating bush 173, 174 Hydraulic motor 175 Cylindrical portion 176 Engaging groove 2 Track portion 20, 21 Track member 200, 210 Flange edge 22, 23 Connecting member 3 Rotary excavator 30 Main body 31 Joint member 32 Strip 4 Crane 40 Suspension wire 41 Suspension tool 42 Air supply pipe 45 Suspension tool 5 Concrete pile 50 Ready-mixed concrete 9 Ground 90 First pile hole 91 Second pile hole 910 Excavation place of the second pile hole

Claims (2)

A table base, a rotary drive unit provided on the table base for rotating and rotating the rotary excavator in a vertical state, a traveling unit having traveling wheels driven by a prime mover, and the table base A rotary table having an outrigger,
The rotary table includes a track portion that can be driven by the running portion ,
Having a guide means for allowing the rotary table to travel along the direction of the track portion;
The track portion is an H-shaped steel in which both flanges are positioned above and below, and the two are arranged in parallel, and the guide means extends from the outside to the edge of the flanges of both H-shaped steels. Rotary table device for a rotary excavator having a fitting that is slidably fitted in the rotary excavator. Fixing the rotary table to the excavation position of the first pile hole on the track portion;
Passing a rotary excavator through a rotary drive of a rotary table using a crane, rotating the rotary excavator to excavate a first pile hole in the ground;
Lifting the rotary excavator with the crane and extracting it from the first pile hole and the rotary drive of the rotary table;
Moving the rotary table to the excavation position of the second pile hole by self-propelling on the track portion, and fixing to the excavation position;
Suspending the ready-made pile in the first pile hole and embedding it in the first pile hole so that the time and the time when the rotary table is moved and fixed to the excavation position of the second pile hole overlaps, and
Passing the rotary excavator through the rotary drive of the rotary table with the crane, rotating the rotary excavator, and excavating a second pile hole in the ground.
Pile foundation construction method.

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