JP4108056B2 - Pile foundation construction equipment and construction method - Google Patents

Description

  The present invention relates to a construction apparatus and construction method for a pile foundation used for a foundation of a building such as a house, and in particular, a disk-shaped pile foundation having a predetermined pressure receiving area at a lower portion of a pile hole dug vertically from the ground. The present invention relates to a method of constructing a pile foundation that is easy to construct and has a large supporting force by leaving an embedded member and standing an existing pile on the disk-shaped pile foundation member.

Conventionally, when constructing a structure such as a house or other small building, the conditions such as the strength of the ground at the construction site are investigated, and the weight of the structure to be constructed is When it is judged that the strength cannot be supported, the pile foundation is used to increase the bearing capacity. In order to increase the bearing capacity of the ground, by placing existing piles such as concrete and steel pipe piles, while excavating the vertical hole, mixing cement milk etc. into the soil of the excavated hole, Means such as columnar ground improvement are used. In addition, various construction methods are used, such as placing an existing pile member into a hole in which the columnar ground has been improved and integrating it into a large-diameter pile. As a column member for supporting the foundation of the building on the ground, a commonly used construction method is known to use, for example, technical means as disclosed in the following document 1. In the conventional example, the soil in the excavation hole and the solidified material are mixed, and an existing pile is placed in the structure constructed as a pillar-shaped improved soil structure, and integrated with the improved soil pillar. Many examples are known as what can construct | assemble the foundation by a support pillar easily (refer patent document 1).
Japanese Patent Publication No.1-40173

  When the stratum that supports the foundation of the building is deep, it is necessary to use long steel pipe piles and so on. Furthermore, since a large amount of soil is generated when a foundation pile is constructed using a conventional method as disclosed in the above-mentioned conventional example, the treatment of the remaining soil becomes a problem. In addition, soil columns constructed by mixing cement milk etc. with soil can exhibit the ability to support a large load due to the large friction between the outer surface of the column and the soil wall of the hole. In addition, there is an unavoidable problem that excessive soil is generated when building columns.

  The present invention provides a large support force using a short steel pipe pile for a support layer in a relatively shallow position, and can easily check the support force of the pile, and easily set the support strength of the pile. The purpose is to provide possible construction methods.

The inventions of claims 1 to 3 of the present invention relate to a pile foundation construction device,
The invention of claim 1 is an excavator used for constructing a pile foundation by standing a pile in an excavated hole,
In the excavation device, an outer rod and an intermediate rod are provided in a concentric double pipe shape, and a drive member for rotation for rotating or independently rotating the double rod, and the outer rod being an intermediate rod A sliding drive member that is movable in the length direction with respect to
A spiral flight member is provided at the lower part of the outer rod member, and a mechanism for detachably supporting the excavating blade member is provided at the lower end portion of the middle rod, and on the upper surface of the excavating blade member to be combined with the lower end portion of the intermediate rod. Is provided with a member to be supported corresponding to the support member provided at the lower end of the middle rod, cut out a part of the plate of the excavating blade member, and bent into the lower portion of the fan-like plate and One-piece,
The driving device rotates the flight member provided at the lower portion of the outer rod and the excavation blade member supported by the lower end portion of the middle rod, and after excavating the hole for standing the pile, the outer member It is configured as a device that works to excavate a pile hole in the ground without causing the soil of the hole to be discharged to the ground by performing the action of pressing the soil of the hole while raising the rod stepwise. And

According to a second aspect of the present invention, an excavation blade member used for excavating a vertical hole supported by the lower end portion of the middle rod is provided with a locking means capable of engaging / disengaging with respect to the middle rod. A plate member used as the foundation of the arc-shaped pile, the excavation blade member provided in the lower part of the stopping means, and a excavation part provided by bending at a predetermined angle from the plate member on the tip end side in the rotation direction of the rod, Configure it as one,
After digging a vertical hole in the ground using the excavating blade member by the operation of rotating the middle rod in one direction, the excavating blade member is removed from the intermediate rod and left at the bottom of the hole. It is used as a member that receives a pile to be erected.
A plate member used as the foundation of the arcuate pile, the excavation blade member provided at the lower part of the locking means, and a excavation unit provided by bending at a predetermined angle from the plate member on the tip end side in the rotation direction of the rod; Is configured as an integral unit,
The middle rod is rotated in one direction, and the excavation part performs an operation of excavating a vertical hole in the ground.

According to a third aspect of the present invention, the sliding drive member capable of moving the outer rod in the length direction with respect to the middle rod is provided with a cylinder device between the upper device and the lower support member of the outer rod,
By driving the cylinder device, it is configured to perform the action of pushing down the middle rod and the action of raising the outer rod by the reaction force, and the action of pushing down the middle rod and pressing the excavating blade member It is characterized by using the reaction force received by the flight member of the rod.

Invention of Claim 4 is related with the construction method of a pile foundation, It provided in the lower end part of the said intermediate rod by rotating the said intermediate | middle rod and an outer rod simultaneously using the excavation apparatus used for the excavation of the said pile foundation. The excavating blade member is used to excavate the vertical hole as a pile hole,
After excavating the pile hole at a predetermined depth, the cylinder device of the sliding drive member is operated, the action of pushing down the middle rod, and the action of raising the outer rod by the reaction force, Raise the predetermined height,
With the excavation blade member used as a pile foundation member fixed to the bottom part of the pile hole excavated as the vertical hole, the flight member is raised while rotating in the opposite direction to the excavation, and the upper part of the excavated hole is After filling the soil while pushing the soil toward the bottom of the hole, and gradually pushing the soil in the pile hole while raising the outer rod stepwise, the bottom of the pile hole The excavator is pulled up while leaving the excavation blade member, and the existing pile member is inserted into the excavated pile hole, and the pile foundation is constructed by standing on the pile foundation member.

  Using the equipment configured as described above, leave the auger-shaped excavation blade used for excavation in the lower part of the excavated pile hole as a disk-shaped pile foundation member, and stand the existing pile member on it Thus, the reliability of the support strength of the foundation pile can be improved. In addition, when the foundation pile is erected, the force that presses the pile foundation against the bottom of the hole is set as the support strength of the pile, so that it is possible to easily obtain information on the strength of the ground. The work for obtaining the support strength can be easily performed. And in order to set the supporting force of the pile, the pile foundation member is used as the disk member having a large pressure receiving area at the bottom of the hole by using the reaction force when raising the flight member above the member used for excavation. The pressing force can be controlled. When the outer rod provided with the flight member is raised without rotation by the cylinder device, the shape of the flight member can be set so that the resistance of the soil is maximized.

  Further, in the apparatus used in the present invention, the driving means for rotating the excavation rod and the member receiving the load of the disk-like pile are pressed between the middle and outer rods to press the pile bottom. Thus, only the combination with a mechanism for setting the pressing force is an essential configuration. Therefore, it is possible to easily set the strength for supporting the load of the pile member standing in the excavated hole by controlling the force pressing against the disk member, and arbitrarily adjust the supporting force of the foundation of the building be able to. In addition to the above action, in the present invention, it is not particularly necessary to use a device such as a large crawler crane for construction to construct a pile foundation, and the device can exhibit a small mobility. Can be configured.

  When implementing the pile foundation construction method described below, it is possible to use a vehicle such as a crane equipped with a self-propelled suspension arm in the same manner as a conventionally known cast-in-place pile construction device. However, it is possible to use an apparatus that is supported by a bowl-shaped apparatus that is fixedly installed on the site and that cannot be moved by itself. In addition, for the pile foundation construction device, only a drive device for rotating the rod and an auxiliary device for supplying pressure oil or the like to the cylinder device are arranged. Thus, since the mechanism which supplies a solidification material is not used, especially the structure of the supporting member, drive mechanism, and excavation apparatus which are arrange | positioned on a ground part is not specifically limited.

  According to the illustrated example, the configuration of the apparatus of the present invention will be described first. The illustrated working device 1 can be used as a construction device equipped with a mechanism for ground improvement in a self-propelled vehicle like a conventional cast-in-place pile construction device. In addition, it is possible to configure as a small construction device that cannot be self-propelled by using a bowl-shaped support device combined with a pillar member. For example, when using a device having a mechanism as shown in FIG. 1, the working device 1 includes a support arm 3 that protrudes from a crane device or another self-propelled work vehicle main body 2 to a predetermined length, 3a is used to fix and support the column member 5 standing at a predetermined height. A wire 4 is disposed between the winch 4a and the upper device 10 via a head sheave 6 provided on the top of the column member 5, and the upper device 10 is supported so as to move up and down. The upper device 10 moved up and down along the support member 5 may be provided with a drive mechanism for driving the rods 15 and 20 of the excavator.

  In the working device 1, the double concentric rods 15 and 20 are driven by the drive mechanism provided in the upper device 10, and the excavation blade member 17 and the flight member 21 provided at the lower portion of each rod are connected. Used as an excavator, excavating a vertical hole for standing a pile member. In the double hollow pipe-shaped rods 15 and 20 that are supported by the support device 10 and used for excavation of pile holes, as shown in FIG. 12, a cylinder device 13 is disposed between the rotary head 11 and the rotary head 11. As will be described later, the cylinder device 13 is used when a pressing action is applied to the excavation blade member 17 provided at the lower end portion of the intermediate rod 15 toward the bottom of the hole. Are connected to means for supplying hydraulic pressure or the like (not shown).

  Then, the cylinder device 13 gives the action of pressing the excavating blade member 17 toward the bottom of the hole, and the supporting force of the pillar (pile) member standing later can be easily set by the pressing action. It is to make. In addition, after giving a press action with respect to the said excavation blade member 17 after excavating the said pile hole 7, the flight member 21 provided in the outer rod 20 is raised in the soil of the upper part. Therefore, the weight of the soil above the hole and the frictional resistance against the hole wall act. Therefore, the reaction force when the flight member is lifted up in the soil located in the upper part of the hole in the dug down hole is the force that presses the excavation blade member 17 downward, or It acts as a pressure. Then, by appropriately controlling the value of the force applied when the excavation blade member 17 is pushed down, the support strength of the pile supporting the foundation is arbitrarily set in the support pile member standing on the excavation blade member 17. It becomes possible to do.

  In the example of the construction apparatus 1 shown in FIGS. 1 and 2, the excavation blade member 17 provided at the lower end portion of the middle rod 15 among the double-arranged rods 15 and 20 is shown in FIGS. 3 (a) and 3 (b). This configuration will be described later. The flight member 21 provided on the outer rod 20 can be configured by attaching a plurality of plate-shaped members to the rod in a radial direction and a vertical direction with a predetermined interval. In addition, the upper part of the flight is configured as a spiral flight member having a small diameter and the lower part is formed as a large diameter, and the lower part of the spiral member is formed with an outer diameter substantially the same as the diameter of the excavating blade member 17. can do. The length of the spiral member in the vertical direction can be arbitrarily set. When the spiral member is formed as a conical screw as a whole, it may be possible to improve workability.

  The excavation blade member 17 provided on the intermediate rod 15 has a structure as illustrated in FIG. 3. At the lower end portion of the intermediate rod 15 composed of a pipe having an arbitrary diameter, the support blade 16 is used for excavation blades. The projecting member 19 of the member 17 is locked, and the excavation blade member 17 is provided to be rotated by the intermediate rod 15. The excavation blade member 17 has a length and a shape in which a part of a disc is bent as an excavation portion 18a, and is configured as a substantially fan-shaped plate portion 18, and the shape for bending the excavation portion 18a is arbitrarily set. It is possible to form. In addition, it is possible to perform a special treatment on the cutting edge of the excavating part 18a so that soil can be excavated, as in the conventional vertical hole excavating apparatus. . However, since the excavation blade member 17 described in the present embodiment is used as a foundation for a pile to be erected later, it is left as it is at the bottom portion of the drilled vertical hole. It is not a good idea to do additional processing that increases the price.

  In the connecting means 16 provided at the lower end portion of the middle rod 15, two crest-like blocks 16a are arranged at a predetermined interval so as to form a groove portion 16b in the pipe, and between the blocks. A groove 16b is formed. Then, the projecting member 19 provided so as to project from the upper portion of the excavation blade member 17 is inserted into the groove 16b and held, and the intermediate rod 15 is rotated so that the excavation blade member 17 can be rotated. Provide. Moreover, after digging a vertical hole in the ground using the excavation blade member 17, the excavation blade member 17 is pressed against the bottom of the hole using the cylinder device 13, and then the intermediate rod 15 is raised. The excavation blade member 17 is left in the soil.

  The operation of excavating a pile hole by using the excavator 1 configured as described above to leave the excavation blade member pressed against the bottom of the hole, and then standing an existing pile will be described below. In the example shown in FIG. 4, first, as shown in FIG. 4A, the inner and outer rods 15 and 20 are driven in a state where the excavating blade member 17 and the flight member 21 are overlapped to move downward from the ground. The pile hole 7 as a vertical hole is constructed by digging down. When constructing the pile hole, the excavator is propelled downward in the soil as a whole without the flight member 21 moving the soil excavated by the excavating blade member 17 upward.

  And after digging down the said vertical hole 7 to the position of predetermined | prescribed depth, as demonstrated in FIG. 2, the upper supporting member 11 (it is also called a rotation head) and the lower supporting member 12 (middle head) ), The cylinder device 13 is operated in the direction of extending, and the middle rod 15 is moved downward and the outer rod 20 is moved upward. At that time, since the lower end portion of the middle rod 15 is restricted to the bottom portion of the hole by the excavating blade member 17, the outer rod 20 is raised by the cylinder device 13. Since the flight member 21 protrudes from the outer rod 20, the soil above the flight member 21 and the hole wall act as resistance against the upward movement of the flight member 21. Therefore, the resistance force against the ascending action of the outer rod 20 acts as a force for pushing down the middle rod 15, so that the lower end portion of the middle rod 15 pushes down the excavating blade member 17 strongly. In addition, what is necessary is just to comprise the flight member provided in the said outer rod 20 by the blade | wing member of arbitrary shapes so that a big frictional resistance can be exhibited, when the effect | action pulled out without rotation is added.

  As described above, the frictional resistance acts on the force that further presses the soil pressed against the wall of the vertical hole 7, so that the reaction force against the force that lifts the flight member 21 is increased. The excavating blade member 17 placed under the middle rod 15 is pressed toward the bottom of the hole. Since the force applied from the cylinder device 13 to the middle rod 15 acts as a force for pressing the excavating blade member 17 downward, the force applied to the cylinder device 13 is deferred ( The excavating blade member 17 (which is pressed and fixed) is set as a supporting force of a pile capable of supporting a load in the ground. When the excavation blade member 17 is pushed down by the intermediate rod 15 and the support force of the pile by the excavation blade member 17 is to be set, the pressing force is compared with the design value, and the pressing force is arbitrarily set. Can be controlled. That is, by adjusting the hydraulic pressure supplied to the cylinder device, it is possible to appropriately set the supporting force of the ground, ... the supporting force of the pile to be erected.

  Further, when the cylinder device 13 is used to push the flight member 21 and the excavating blade member 17 pressed against the bottom of the hole, the cylinder device 13 adds the operation. The sum of the applied forces is set as the supporting force on the ground by the excavating blade member 17. Therefore, when the excavating blade member 17 is applied to press the bottom of the hole 7 in a state where the excavating blade member 17 sinks greatly compared to the design value, the pressing operation by the cylinder device is further increased. It continues while strengthening, and it becomes necessary to sink an excavation blade member until the subsidence of the middle rod 15 stops. As described above, when the amount of subsidence of the excavating blade member 17 is large, it is assumed that the reliability of the foundation load bearing force becomes a problem with respect to the pile erected on the excavation blade member 17. When such a problem occurs, it is possible to easily change the size of the excavation blade member 17 used for excavation and load support, that is, change the pressure receiving area as a large one according to the situation at the site. it can. Therefore, it is possible to change the design of the excavating blade member, the size of the flight member, and the like at any time according to the geology of the site during the site construction.

  As described above, a vertical hole is excavated using the excavator, and the excavating blade member 17 is pressed against the bottom of the excavated hole and fixed to the bottom of the hole. From the state (a), the operation is shifted to the operation of slightly lifting the middle rod 15. Then, as shown in FIG. 5B, the projecting member 19 of the excavating blade member 17 comes out of the holding portion 16 at the lower part of the intermediate rod 15 and remains in a state where the excavating blade member 17 is placed on the bottom of the hole. It will be. Thereafter, by rotating the outer rod 20 in the reverse direction, the flight member 21 is rotated so as to send the soil in the hole downward, and the soil is pushed down by the screw. The excavator is lifted to the ground as shown in FIG.

  In the state where the excavator is raised to the ground, as shown in FIG. 5 (a), the flight member 17 is only placed at the bottom of the pile hole 7, and the soil is filled in the hole. It has become a thing. Next, as shown in FIG. 5 (b), an existing pile member 25 is erected through the center of the hole 7. When the pile 25 is driven, the soil in the hole 7 is once excavated by a screw. Since the soil is in a loosened state, it can be easily placed even if the pile has a large diameter. The pile member 25 erected through the above process is positioned at the lower end portion thereof on the excavation blade member 17 and fixedly held at the bottom portion of the hole. After that, as shown in FIG. 5C, the foundation 29 of the building is constructed so as to include the upper portion of the pile member 25, and the foundations 29 are connected to each other using concrete for placing the adjacent pile members. Can be used as a foundation for buildings with high support strength.

  The work device 30 shown in FIG. 6 is slightly different from the device described in FIG. 2 except that the excavation blade member 17 for supporting the pile member 25 to be placed later is left at the bottom of the pile hole. The same thing is used. Moreover, the operation | work which excavates a pile hole using the working apparatus 30 shown in the said FIG. 6 is performed by the same process as the said FIG. 4, 5, The structure of the apparatus used for it is demonstrated below. . The working device 30 shown in FIG. 6 is supported by a support member of the working device as shown in FIG. 1, and the excavation blade member 17 and the flight member 22 are rotated by a driving device provided in the upper device 10. Drilling a hole with a predetermined diameter is the same as in the above embodiment.

  The rotary head 11 rotated by the upper device 10 is provided with an upper mechanism 31 provided with a cylinder or the like between the portions supporting the double concentric rods 15 and 20. In the upper mechanism 31, a connection arm 32 for transmitting a rotational force is provided between the rotary head 11 and the upper support portion 35, and is arranged at the lower end portion of the middle rod 15 between the connection arms 32. A cylinder device 33 is provided to act on the excavating blade member 17 to be pressed toward the bottom portion of the hole. In the example described with reference to FIG. 2, the cylinder device 33 has been described using the long cylinder device 13. However, in the operation of pushing down the middle rod 15, a large stroke is often not required. In this embodiment, a short stroke cylinder device 33 may be used.

  In the working device 30, a drilling blade member 17 similar to the example described in FIG. 3 is provided at the lower end of the middle rod 15, and the drilling blade member 17 is driven by the middle rod 15, The excavation is the same as in the above reference. In addition, a flight member 22 having the same outer diameter is provided in a predetermined range of the outer peripheral portion of the lower portion of the outer rod 20 provided concentrically in combination with the middle rod 15. . When the flight member 22 having the same outer diameter is provided, the reaction force of the outer rod 20 on the flight member 22 acts greatly when the intermediate rod 15 is pushed down. That is, in the final stage of excavating a pile hole using the working device 30, when the intermediate rod 15 is pushed down by the actuator 34, the area in contact with the soil is large with respect to the force to lift the flight member 22, The resistance of the soil will be greatly affected.

  In addition, as mentioned above, as a pile member standing up on the disk-shaped member left behind at the hole bottom of the hole once excavated, any conventional well-known pile should be used. Is possible. For example, when using a cylindrical pile member such as a large-diameter steel pipe-like member or a concrete pipe-like column member, it can be easily combined with a drilling blade member. . In addition, even when the pile member has an H-section steel or other cross-sectional shape, a recess or the like is provided so that the projecting member 19 of the excavation blade member 17 can be fitted to the lower end portion of the pile. By embedding the placed material in the excavated hole, the disk member and the column member can be easily integrated.

  In addition to constructing the pile foundation, the excavator can also be used when measuring the support strength of the ground using the mechanism described in the embodiment as it is. That is, by operating the hydraulic pressure on the cylinder device in the state described in FIG. 4A, the support strength per pressure receiving area of the excavating blade member can be easily measured based on the value of the supplied hydraulic pressure. can do. In addition, by observing the state where the excavation blade member sinks when a force that pushes down the excavation blade member is applied using the intermediate rod, the nature of the soil (the magnitude of the load support force) in the deep ground, etc. You can easily know the information. In fact, the properties of the ground can be easily estimated by observing the pressing force applied by the cylinder device against the presumed ground support force and the subsidence state of the excavation blade member at that time. It becomes possible to improve the reliability of the support foundation. And, as mentioned above, by accurately grasping the load support strength etc. at the bottom of the pile hole and building the pile foundation based on the data, the reliability of the pile foundation built in the ground is As a matter of course, it is possible to construct the system so that the reliability is higher and the problem such as unequal subsidence does not occur after the construction of the building as compared with the example constructed based on the conventional experience.

  In the embodiment of the present invention, as shown in FIG. 1, when a self-propelled device with good maneuverability such as a crawler crane is used, an operation of constructing a large number of piles can be easily performed. , Work efficiently. In addition, when using a tower like a small fence, although it is inferior in mobility, it is easy to construct pile foundations even in a narrow place, and it is very narrow like the recent home construction site Even in a place where a large apparatus such as a crane cannot be used on the site, it is possible to perform the work by using a small tower-like apparatus that can be used on the site. And, by using any combination of hydraulic pressure and other power supply devices for the excavation device, it is possible to easily construct a strong and reliable pile foundation for any ground or formation. It will be a thing. Furthermore, by using a device that exerts a pressing action between the double rods using the hydraulic pressure, the strength of the bottom of the hole can be arbitrarily set regardless of the size of the construction device in particular. Conditions such as the configuration of the equipment will not affect the quality of construction.

  As described in the above embodiment, in the present invention, after excavating a pile hole, a desired value of the supporting force of the pile hole is obtained by applying an action of hydraulically pressing the excavating blade member to the bottom of the hole. Can be set. And, since the pile with a large pressure-receiving area is buried in the pile hole with increased support force, the pressure-receiving area on the bottom surface is set large even if the existing pile itself is thin. Therefore, the constructed pile can demonstrate the support strength to the building according to the support force set by consolidating the bottom of the hole. In addition, as described above, in the example of standing an existing pile, it is natural that the thickness of the pipe is selected according to the load that the pile bears, Since the support strength of the piles to be built can be built as the one calculated at the time of design, even if the intervals between the piles are widened and the number of piles to be built is reduced, the support action of the building There will be no trouble.

It is explanatory drawing which shows the structure of a construction apparatus. It is explanatory drawing of a structure of a working mechanism. (A), (b) is explanatory drawing which shows the structure of an excavation blade member, and the connection relation with a middle rod. (A)-(c) is explanatory drawing of the state of excavation of a vertical hole, and a post-process. (A)-(c) is explanatory drawing of the process of standing up an existing pile in the excavated pile hole. It is explanatory drawing which shows the structure of the 2nd Example of the working mechanism of this invention.

Explanation of symbols

1 construction equipment, 2 working equipment, 5 strut members, 7 pile holes,
10 upper device, 11 upper support member, 12 middle head,
13 cylinder device, 14 drilling device, 15 medium rod,
16 support part, 17 excavation blade member, 18 plate member, 19 projecting member,
20 outer rod, 21/22 flight member, 25 pile member,
30 working devices, 31 upper mechanism, 32 connection arm,
33 Cylinder device, 35 Upper support part.

Claims (4)

In the excavator used to build a pile foundation by standing a pile in the excavated hole,
In the excavation device, an outer rod and an intermediate rod are provided in a concentric double pipe shape, and a drive member for rotation for rotating or independently rotating the double rod, and the outer rod being an intermediate rod A sliding drive member that is movable in the length direction with respect to
A spiral flight member is provided at the lower part of the outer rod member, and a mechanism for detachably supporting the excavating blade member is provided at the lower end portion of the middle rod, and on the upper surface of the excavating blade member to be combined with the lower end portion of the intermediate rod. Is provided with a member to be supported corresponding to the support member provided at the lower end of the middle rod, cut out a part of the plate of the excavating blade member, and bent into the lower portion of the fan-like plate and One-piece,
The driving device rotates the flight member provided at the lower portion of the outer rod and the excavation blade member supported by the lower end portion of the middle rod, and after excavating the hole for standing the pile, the outer member It is configured as a device that works to excavate a pile hole in the ground without causing the soil of the hole to be discharged to the ground by performing the action of pressing the soil of the hole while raising the rod stepwise. Pile foundation construction equipment. The excavation blade member used for excavating the vertical hole supported by the lower end portion of the middle rod,
A locking member capable of engaging and disengaging with respect to the middle rod is provided, and the excavation blade member provided at the lower part of the locking member is used as the foundation of the arcuate pile, and the tip in the rotation direction of the rod The excavation part provided by bending at a predetermined angle from the plate member on the part side is configured as an integral part,
After digging a vertical hole in the ground using the excavation blade member by the operation of rotating the middle rod in one direction,
The pile foundation construction device according to claim 1, wherein the excavation blade member is removed from the middle rod and left at the bottom of the hole, and is used as a member for receiving a pile to be erected later . The sliding drive member capable of moving the outer rod in the length direction with respect to the middle rod is provided with a cylinder device between the upper device and the lower support member of the outer rod,
By driving the cylinder device, it is configured to perform the action of pushing down the middle rod and the action of raising the outer rod by the reaction force ,
The pile foundation construction apparatus according to claim 1 or 2, wherein the operation of pressing the excavation blade member by pushing down the middle rod is performed using a reaction force received by a flight member of the outer rod . Using the excavator used for excavating the pile foundation, the middle rod and the outer rod are simultaneously rotated, and the excavating blade member provided at the lower end of the intermediate rod excavates the vertical hole as a pile hole. And
After excavating the pile hole at a predetermined depth, the cylinder device of the sliding drive member is operated, the action of pushing down the middle rod, and the action of raising the outer rod by the reaction force, Raise the predetermined height,
With the excavation blade member used as a pile foundation member fixed to the bottom part of the pile hole excavated as the vertical hole, the flight member is raised while rotating in the opposite direction to the excavation, and the upper part of the excavated hole is Perform the action of filling the soil while pressing the soil toward the bottom of the hole,
After performing the operation of sequentially pressing and solidifying the soil in the pile hole while raising the outer rod stepwise, the excavator is pulled up leaving the excavation blade member at the bottom of the pile hole,
Insert the excavated pile holes prefabricated pile element, erected building method of piles, characterized in that to construct the pile foundation with the top of the pile foundation member.

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