JP2006336241A - Pile construction method and pile construction system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete pile construction method and a concrete pile construction system, superior in economic efficiency, by enabling jacking to the hard ground regardless of a diameter and the length of a steel pipe. <P>SOLUTION: This concrete pile construction system 2 has an excavation member 6, a full revolvable jacking machine 8, and a reverse excavator 14. The excavation member 6 is composed of an excavation blade 28 and a reverse head 30. The excavation blade 28 has three blade parts 36 and a plurality of excavation bits 38. The ground E1 of an inside part of the steel pipe 4 is excavated. The reverse head 30 has three arm parts 42, a rotary part 44 rotatably arranged inside the steel pipe 4 in a tip part of the respective arm parts 42, and a plurality of excavation bits 46 installed in a lower end part of the rotary part 44. The ground E2 of a lower part of a lower end surface of the steel pipe 4 is excavated. The rotary part 44 abuts on a lower end surface of the steel pipe 4 when pulling up the excavation member 6, and reduces inward diameter of the steel pipe 4 by rotating to the inside of the steel pipe 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pile construction method and a pile construction system in which a ground pipe is excavated and a steel pipe is placed, and a pile is constructed using the steel pipe.

For example, Patent Document 1 discloses that a steel pipe having a drilling bit at a lower end surface, a drilling member that is detachably disposed at a lower end position inside the steel pipe for excavating the inside of the steel pipe, a steel pipe is rotated, A concrete pile excavation system comprising a rotary press for press-fitting into a slab is disclosed. In this method, the steel pipe and the excavating member are rotated by rotating the steel pipe with a rotary press-fitting machine to excavate the ground, and the steel pipe is press-fitted into the ground.
JP 2004-211500 A

  However, in the method described in Patent Document 1, when the diameter of the steel pipe is increased or the steel pipe is lengthened, the peripheral frictional force generated between the peripheral surface of the steel pipe and the ground is increased. There has been a problem that the rotational force cannot be sufficiently applied to the excavation member and it is difficult to excavate the hard ground.

  In addition, when a sufficient rotational force for excavating hard ground is applied to the drilling member via the steel pipe, the steel pipe plate thickness required to counter this rotational force is greater than the required steel pipe plate thickness as a pile. There is also a problem that sometimes becomes larger.

  Therefore, the present invention has been made in view of the above-mentioned problems, and the purpose thereof is construction of a pile that can be press-fitted into a hard ground regardless of the diameter and length of the steel pipe and is excellent in economic efficiency. It is to provide a method and pile construction system.

  In order to achieve the above object, a pile construction method of the present invention is a pile construction method in which a steel pipe is installed in the ground and a pile is constructed using the steel pipe, and excavated at a position below a lower end portion of the steel pipe. A member is provided, and the steel pipe is press-fitted into the ground while the ground is being excavated by the excavating member by rotating the excavating member and the steel pipe with a separate driving device (first invention). .

  According to a second invention, in the first invention, the excavation member is composed of a main excavation part provided at a lower position inside the steel pipe and a peripheral excavation part provided at a lower position of an end surface of the steel pipe. It is characterized by.

  According to a third invention, in the first or second invention, the peripheral excavation part is configured to be rotatable inward of the steel pipe, and when the excavation member is pulled up, the peripheral excavation part is brought into contact with the end surface of the steel pipe. The diameter is reduced by contacting and rotating inward, and the excavating member is pulled up through the steel pipe in this state.

  According to a fourth invention, in the first or second invention, the peripheral excavation part is configured to be rotatable inward of the steel pipe, and when the excavation member is pulled up, the peripheral excavation part is arranged with respect to the excavation rotation direction. The diameter is reduced by rotating in the opposite direction and turning inward, and the excavating member is pulled up through the steel pipe in this state.

  A fifth invention is characterized in that, in any one of the first to fourth inventions, concrete is placed in the steel pipe press-fitted into the ground to form a steel pipe-wound concrete pile.

  A sixth invention is characterized in that, in any one of the first to fourth inventions, concrete is placed in the steel pipe press-fitted into the ground and the steel pipe is pulled out.

  The pile construction system of the seventh invention is a pile construction system in which a steel pipe is installed in the ground, and the pile is constructed using this steel pipe. The pile construction system is positioned below the lower end of the steel pipe that is rotated into the ground and press-fitted. A drilling member to be attached, a first drive device that rotationally drives the steel pipe, and a second drive device that drives the drilling member and is separate from the first drive device are provided.

  According to an eighth invention, in the seventh invention, the excavation member is constituted by a main excavation portion provided at a lower position inside the steel pipe and a peripheral excavation portion provided at a lower position of an end surface of the steel pipe. It is characterized by being.

  In a ninth aspect based on the eighth aspect, the peripheral excavation part is configured to be rotatable inward of the steel pipe, and when the excavating member is pulled up, the peripheral excavation part contacts the lower end surface of the steel pipe and rotates inward. It is characterized by that.

  In a tenth aspect based on the eighth aspect, the peripheral excavation portion is configured to be rotatable inward of the steel pipe, and is rotated inward when the excavation member is rotated in a direction opposite to the excavation rotation direction. It is characterized by doing.

  According to the pile construction method of the present invention, in order to rotate the excavation member and the steel pipe with separate drive devices, for example, a large rotational force is required for rotational driving of the excavation member such as excavating hard ground. Even in this case, the necessary power can be ensured and efficient construction is possible.

  In addition, in order to rotate the excavation member and the steel pipe with separate drive devices, both the steel pipe and the excavation member are driven into a steel pipe pile at a predetermined depth, and only the excavation member is rotated at a depth beyond the predetermined depth. It is possible to increase the degree of freedom of pile construction, such as drilling and making reinforced concrete piles.

  Furthermore, since the excavation member and the steel pipe are rotationally driven by separate drive devices, the drive devices having the necessary rotational force may be used, and thus the respective drive devices can be reduced in size.

  And, since the excavation member includes the peripheral excavation part, the steel pipe does not excavate the ground, and it is not necessary to counter the rotational force when excavating the ground. It is possible to make it thick.

  In addition, since the peripheral excavation part has a mechanism that can be turned to the inside of the steel pipe after excavation to a predetermined depth by the excavation member, it prevents interference between the peripheral excavation part and the steel pipe when being inserted through the steel pipe. It is possible to smoothly collect the excavation member.

  Furthermore, since the peripheral excavation part has a mechanism that can be rotated to the inside of the steel pipe, the excavation bit that is collected on the ground and provided at the end of the peripheral excavation part can be reused, thereby reducing costs. It is possible.

  By placing concrete in a steel pipe press-fitted into the ground to form a steel pipe-wound concrete pile, the occurrence of local buckling of the steel pipe is prevented by the concrete, and the concrete is subjected to lateral compression restraint by the steel pipe and is brittle. Since collapse and exfoliation are prevented, the absorbed energy and toughness until the steel tube-wound concrete breaks are increased, and the earthquake resistance is excellent.

  In addition, by placing concrete and pulling out the steel pipe press-fitted into the ground, it becomes a general cast-in-place concrete pile, so no special equipment or skill is required.

  The method of installing the pile in the ground is a method of obtaining a strong support force by allowing the pile to penetrate the soft formation from the surface to the hard formation, and hereinafter, the pile construction method and construction according to the present invention A preferred embodiment of the system will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a concrete pile construction system according to the first embodiment of the present invention, and FIG. 2 is a diagram showing a drilling member according to the present embodiment. As shown in FIG. 1, a concrete pile construction system 2 includes a drilling member 6 attached to a lower position of a lower end portion of a steel pipe 4, a full swivel press-fitting machine 8 as a first drive device that rotationally drives the steel pipe 4, and And a reverse excavator 14 as a second driving device for driving the excavating member 6.

  The full swivel press-fitting machine 8 is a device for rotating the steel pipe 4 and press-fitting it into the ground E. The rotary press 10 for gripping and rotating the steel pipe 4 and press-fitting for press-fitting the steel pipe 4 Part 12. The press-fitting part 12 has a plurality of power jacks and controls the expansion and contraction operations of all the power jacks.

  The reverse excavator 14 includes a crawler traveling type base machine 16, an arm part 18 supported in a tiltable manner with respect to the base machine, and a rotary press-fit part 20 installed to be movable up and down with respect to the arm part 18. With. The rotary press-fitting portion 20 is a device for rotating the excavation member 6 and press-fitting it into the ground E, and a hydraulic pump 24 for rotating the excavation member 6 via a rod 22 connected to the excavation member 6. And a telescopic jack 26 for press-fitting the excavation member 6 into the ground E through the rod 22.

  As shown in FIG. 2, the excavation member 6 includes an excavation blade 28 as a main excavation portion provided at a lower position inside the steel pipe 4, and a reverse head 30 as a peripheral excavation portion provided at a lower position of the end surface of the steel pipe 4. The excavating blade 28 is detachably connected to the lower end side of the reverse head 30.

  The excavating blades 28 include a suction port 32 for sucking a gap generated by excavation, a cylindrical part 34 for inserting the sucked gap, and a plurality of radially arranged at equal intervals from the center of the cylindrical part 34. A wing portion 36 and a plurality of excavation bits 38 detachably attached to the lower end portion of each wing portion 36 are provided, and the ground E1 in the inner portion of the steel pipe 4 is excavated.

  The reverse head 30 is connected to the upper end of the cylindrical portion 34, and is disposed radially at equal angles from the center of the cylindrical portion 40 and the cylindrical portion 40 for inserting the gap sucked by the excavating blade 28. Three arm portions 42, a rotation portion 44 that is rotatably installed inside the steel pipe 4 at the distal end portion of each arm portion 42, and a plurality of removably attached to the lower end portion of the rotation portion 44 The excavation bit 46 is provided, and the ground E2 in the lower part of the lower end surface of the steel pipe 4 is excavated. The rotating portion 44 is configured to be able to rotate inside the steel pipe 4 using an elastic force such as a spring, and when excavating, the diameter is expanded to the lower side of the lower end surface of the steel pipe by the tensile force of the spring. However, when the excavation member 6 is pulled up, it abuts on the lower end surface of the steel pipe 4, rotates to the inside of the steel pipe 4, and reduces the diameter to the inside of the steel pipe 4.

  Further, the excavating member 6 is connected to a hydraulic pump 24 of the reverse excavator 14 via a rod 22, and the rotary force is generated by rotating the rod 22 by driving the hydraulic pump 24. And transmitted to the reverse head 30. Further, the excavating blades 28 and the reverse head 30 are pressed against the ground E by extending the telescopic jack 26 of the reverse excavator 14 to perform excavation. The excavation blades 28 excavate the ground E1 that is the inner part of the steel pipe 4, and the reverse head 30 excavates the ground E2 that is the lower part of the end face of the steel pipe 4, and excavate the ground E having different depths.

  Furthermore, the upper end of the rod 22 is connected to a suction pump 50 via a swivel 48, and a slip generated by excavation is sucked from the suction port 32 of the excavation blade 28, and each cylindrical portion 34 of the excavation blade 28 and the reverse head 30, The inside of the rod 40 and the inside of the rod 22 are inserted and discharged out of the pile hole 52.

  Next, the construction method of the concrete pile using the excavation member 6 is demonstrated according to a construction procedure. For convenience of understanding the invention, in this embodiment, a method for constructing a concrete pile under an elevated track will be described, but the object of application of the present invention is not limited to the underpass of a rail, It can be widely applied to general construction.

  3-7 is a figure which shows the construction procedure of the steel pipe winding concrete pile which concerns on this embodiment. As shown in FIG. 3, the work stage 54 is formed by flattening the ground E where the steel pipe 4 is embedded, and a retaining wall 56 is provided to prevent the side wall of the work stage 54 from collapsing. In order to prevent the collapse of the mouth tube 58 is placed.

  Then, as shown in FIG. 4, the excavation member 6 to which the rod 22 is connected is suspended by the portal crane 60 or the like, and is inserted into the mouth tube 58 through the inside of the swivel press-fitting machine 8. The excavating blade 28 is attached to the bottom of the hole. Next, the rod 22 is inserted into the steel pipe 4 while being suspended while the steel pipe 4 is erected by the portal crane 60 or the like, and the mouth pipe 58 is inserted through the inside of the full swiveling press 8. Insert inside. When inserting the steel pipe 4, the insertion is stopped when the lower end surface of the steel pipe 4 reaches a depth slightly shallower than the reverse head 30 of the excavating member 6, and the outer periphery of the steel pipe 4 is held by the full swivel press-fitting machine 8. Then, the upper portion of the rod 22 is connected to the hydraulic pump 24 of the reverse excavator 14, and the upper end of the rod 22 is connected to the suction pump 50 via the swivel 48.

  When excavating the ground E, the excavation blade 28 and the reverse head 30 are rotated through the rod 22 by the reverse excavator 14 to excavate the ground E, and the steel pipe 4 is rotated by the swivel press-fitting machine 8. Press-fitting is performed while following the excavation speed of the excavating member 6. At this time, muddy water containing a gap is sucked from the suction port 32 at the tip of the excavating blade 28 by the suction pump 50 provided on the ground, and the cylindrical portions 34 and 40 of the excavating blade 28 and the reverse head 30 and the inside of the rod 22 And is carried out to a muddy water treatment device (not shown) on the ground. Here, water is poured into the steel pipe 4 in order to facilitate the suction of the slip and sucked as muddy water.

  When excavation progresses and the steel pipe 4 is buried in the ground, a new rod 22 is connected to the upper end of the rod 22, and the new steel pipe 4 is raised while being suspended by the portal crane 60 or the like to lift the rod 22 The steel pipe 4 is inserted into the steel pipe 4, the lower end face of the new steel pipe 4 is abutted against the upper end face of the buried steel pipe 4, and welded to be connected.

  After a new steel pipe is connected to the upper part of the buried steel pipe 4, excavation is started again, and the process is repeated until the lower end surface of the steel pipe 4 reaches a predetermined depth as shown in FIG. When the lower end surface of the steel pipe 4 reaches a predetermined depth, the rotation of the excavation member 6 is stopped and the steel pipe 4 is pressed to confirm that the lower end surface of the steel pipe 4 is securely seated. Then, when the telescopic jack 26 of the reverse excavator 14 is contracted and the excavating member 6 is moved toward the ground, the rotating portion 44 of the reverse head 30 contacts the lower end surface of the steel pipe 4 and rotates inward of the steel pipe 4. The reverse head 30 is reduced in diameter. The rods 22 connected in this state are sequentially removed, and the excavating member 6 is inserted through the steel pipe 4 and pulled up to the ground.

  Next, the slime stored in the bottom of the pile hole 52 in a hollow state is removed, and a tremey pipe 62 for placing concrete is inserted into the steel pipe 4 to the bottom of the pile hole 52 as shown in FIG. The concrete is cast from the bottom of the hole, and the treme tube 62 is pulled out, and the concrete C is cast to the hole of the pile hole 52 as shown in FIG. The concrete C placed in the vicinity of the hole opening of the pile hole 52 sucks the upper part of the concrete C with a vacuum or the like before hardening, and takes measures against breathing.

  In the present embodiment, the method of placing the concrete C without installing the reinforcing bar in the steel pipe 4 has been described. However, the present invention is not limited to this, and the reinforcing bar is inserted into the steel pipe 4 and thereafter You may use the method of placing concrete in the.

  According to the concrete pile construction method in the present embodiment, the excavation member 6 and the steel pipe 4 are driven to rotate by the excavation member 6 in order to drive the excavation member 6 and the steel pipe 4 by the separate drive devices of the reverse excavator 14 and the full swivel press-fitting machine 8, respectively. Even when a large rotational force is required, the necessary power can be secured and efficient construction is possible. Further, since the excavation member 6 and the steel pipe 4 are rotationally driven by separate drive devices, the drive devices for the rotational force necessary for each of them can be obtained. It is possible to install concrete piles even in narrow spaces.

  And by providing the reverse head 30, since the steel pipe 4 does not excavate the ground E, and it is not necessary to oppose the rotational force at the time of excavating the ground E, the thickness of the steel pipe 4 is the minimum necessary as a pile. The thickness can be limited. Moreover, since the reverse head 30 has the rotation part 44 which can be rotated inside the steel pipe 4, the interference with the reverse head 30 and the steel pipe 4 at the time of inserting the inside of the steel pipe 4 is prevented, and the excavation member 6 is made smooth. Can be recovered. In addition, since the reverse head 30 has a mechanism that can rotate to the inside of the steel pipe 4, the excavation bit 46 that is collected on the ground and provided in the rotating unit 44 can be reused, thereby reducing costs. It is possible.

  Further, by placing concrete C in the steel pipe 4 press-fitted into the ground E to form a steel pipe wound concrete pile, the occurrence of local buckling of the steel pipe 4 is prevented by the concrete C, and the concrete C is In addition to being subjected to lateral compression restraint, brittle collapse and peeling are prevented, so that the absorbed energy and toughness until the steel tube-wound concrete breaks increase, and the earthquake resistance is excellent.

  Next, different embodiments of the concrete pile construction method and excavation member according to the present invention will be described. In the following description, the same reference numerals are given to portions corresponding to those using the same technique as in the first embodiment, and description thereof is omitted.

  FIG. 8 is a schematic view of a drilling member according to the second embodiment of the present invention. The concrete pile construction system 63 in the present embodiment includes a drilling member 64 attached to a lower position of the lower end portion of the steel pipe 4, a full swiveling presser 8, and a reverse excavator 14. As shown in FIG. 8, the excavation member 64 includes an excavation blade 28 and a reverse head 66 as a peripheral excavation portion provided at a position below the end surface of the steel pipe 4. The excavation blade 28 is on the lower end side of the reverse head 66. It is detachably connected to.

  The reverse head 66 has a cylindrical portion 40, three arm portions 42, and an outer shape that is tapered, and a rotation bit 68 that is rotatably installed inside the steel pipe 4 at the distal end portion of each arm portion 42. The ground E2 in the lower part of the end face of the steel pipe 4 is excavated. The rotating bit 68 is configured to be able to rotate inside the steel pipe 4 using an elastic force such as a spring, and when excavating, the diameter is expanded to the lower side of the lower end surface of the steel pipe by the tensile force of the spring. . When the excavation member 6 is pulled up, first, the reverse head 66 is rotated in the direction opposite to the excavation rotation direction to cause the rotation bit 68 to substantially rotate inward, and then the excavation member 64 is pulled up. Then, the tapered portion of the rotating bit 68 is brought into contact with the lower end surface of the steel pipe 4, and the excavating member 64 is pulled up, and the rotating bit 68 is inserted into the steel pipe 4 using this tapered shape. Reduce the diameter to the inside.

  As in the first embodiment, the excavation member 64 is connected to the reverse excavator 14 via the rod 22, and the hydraulic pump 24 of the reverse excavator 14 is driven to excavate rotational force via the rod 22. This is transmitted to the excavating blade 28 and the reverse head 66 of the member 64. Furthermore, the telescopic jack 26 of the reverse excavator 14 is extended to press the excavating blades 28 and the reverse head 66 against the ground E for excavation. The excavating blades 28 excavate the ground E1 that is the inner part of the steel pipe 4, and the reverse head 66 excavates the ground E2 that is the lower part of the end face of the steel pipe 4, and excavate the ground E having different depths.

Next, a concrete pile construction method using the excavation member 64 will be described according to a construction procedure.
Also in the present embodiment, as in the first embodiment, the mouth tube 58 is driven at a position where the steel pipe 4 is press-fitted, and the swivel member 64 to which the rod 22 is connected is fully swung while being suspended by the portal crane 60 or the like. The inside of the press-fitting machine 8 is inserted and inserted into the mouth tube 58, and the excavating blade 28 is settled to the bottom of the pile hole 52. Next, the rod 22 is inserted into the steel pipe 4 while being suspended while the steel pipe 4 is erected by the portal crane 60 or the like, and the mouth pipe 58 is inserted through the inside of the full swiveling press 8. When inserted to a predetermined depth, the insertion is stopped, and the outer periphery of the steel pipe 4 is gripped by the full turning press-fitting machine 8. Then, the upper end of the rod 22 is connected to the suction pump 50 via the swivel 48.

When excavating the ground E, the reverse excavator 14 rotates the excavating blades 28 and the reverse head 66 through the rod 22 to excavate the ground E, and the full swiveling press 8 rotates the steel pipe 4. Press-fitting is performed while following the excavation speed of the excavation member 64.
While excavating the ground E with the excavation member 64, the steel pipe 4 is press-fitted and excavated until the lower end surface of the steel pipe 4 reaches a predetermined depth.

  In the present embodiment, the method of first inserting the excavating member 64 into the mouth tube 58 and then inserting the steel pipe 4 into the mouth tube 58 has been described, but the present invention is not limited to this. The order of insertion into the mouth pipe 58 is reversed. First, the steel pipe 4 is inserted into the mouth pipe 58, and then the turning bit 68 of the excavating member 64 is turned inside the steel pipe to contract the reverse head 66. The excavation member 64 may be inserted into the steel pipe 4.

  After the excavation to a predetermined depth, the reverse head 66 is rotated in the opposite direction to the excavation rotation direction, the rotation bit 68 is rotated inward, and the reverse head 66 is reduced in diameter. The telescopic jack 26 of the excavator 14 is contracted, and the inside of the steel pipe 4 is inserted and pulled up to the ground.

9 and 10 are diagrams showing a construction procedure of the concrete pile after the excavation member according to the present embodiment is carried out from the pile hole.
After the slime stored at the bottom of the pile hole 52 is removed, a cylindrical reinforcing bar 70 having an outer diameter substantially smaller than the inner diameter of the steel pipe 4 is inserted into the steel pipe 4 over the entire depth, as shown in FIG.

And as shown in FIG. 10, while inserting the treme tube 62 for concrete placement in the steel pipe 4 to the hole bottom of the pile hole 52, while placing concrete from the lower end part of the steel pipe 4, the steel pipe 4 and the tremy pipe 62 is pulled out and concrete C is driven to the hole of the pile hole 52.
According to the concrete pile construction method in this embodiment, the concrete C is cast and the steel pipe 4 press-fitted into the ground E is pulled out to become a general cast-in-place concrete pile. Do not need.

FIG. 11: is a figure which shows the construction procedure of the concrete pile which concerns on 3rd embodiment of this invention. Also in the present embodiment, as in the first and second embodiments, the excavation member 6 (64) excavates the ground E, the steel pipe 4 is press-fitted, and the lower end surface of the steel pipe 4 reaches a predetermined depth. Drill until. When the lower end surface of the steel pipe 4 reaches a predetermined depth, the excavation member 6 (64) stops rotating. Then, the telescopic jack 26 of the reverse excavator 14 is contracted, the reverse head 30 (66) is contracted, and the excavating member 6 is inserted through the steel pipe 4 and pulled up to the ground.
The reverse head 30 (66) is removed from the excavation member 6 (64) on the ground, this time the excavation blade 28 and the rod 22 are connected, and the inside of the steel pipe 4 is inserted again and inserted to the bottom of the pile hole 52. .

  As shown in FIG. 12, the excavation blade 28 is rotated via the rod 22 by the reverse excavator 14 to excavate the ground E <b> 1 that becomes the inner portion of the steel pipe 4. When the excavation blade 28 reaches a predetermined depth, the rotation of the excavation blade 28 is stopped and the excavation is finished. Then, similarly to the above, the telescopic jack 26 of the reverse excavator 14 is contracted, and the excavating blade 28 is inserted through the steel pipe 4 and pulled up to the ground.

  After removing the slime stored at the bottom of the pile hole 52, as shown in FIG. 13, the cylindrical shape having an outer diameter substantially smaller than the inner diameter of the excavating blade 28, and the bottom of the steel pipe 4 from the hole bottom of the pile hole 52. Reinforcing bar rod 72 having a length that partially overlaps is inserted.

  Then, the concrete casting treme tube 62 is inserted to the bottom of the pile hole 52, the concrete C is cast from the bottom of the pile hole 52, and the treme tube 62 is pulled out, as shown in FIG. Concrete C is placed up to the hole opening of the hole 52.

  In addition, in this embodiment, although the method to insert the rebar rod 72 of the length from the hole bottom of the pile hole 52 to the part where the lower end part of the steel pipe 4 overlaps was demonstrated, it is not limited to this. Alternatively, a method of inserting a reinforcing bar 72 having a length from the bottom of the pile hole 52 to the upper end of the steel pipe 4 may be used.

  According to the concrete pile construction method in the present embodiment, the excavation member 6 (64) and the steel pipe 4 are rotationally driven by separate drive devices, so that the steel pipe 4 and the excavation member 6 (64) are at a predetermined depth. It is possible to increase the degree of freedom of the pile construction by driving both sides into a steel pipe four-ply concrete pile, and excavating by driving only the excavating member 6 (64) to rotate deeper than a predetermined depth. is there.

  In each of the above-described embodiments, the method of rotating the steel pipe 4 has been described. However, the present invention is not limited to this. For example, when excavating a soft formation, press-fitting without rotating the steel pipe 4 is possible. For example, when it can be inserted into the ground E just by doing, it does not have to be rotated.

  The excavation members 6 and 64 described in the first and second embodiments can be used in other embodiments.

It is a figure which shows the construction system of the concrete pile which concerns on 1st embodiment of this invention. It is the schematic of the excavation member which concerns on this embodiment. It is a figure which shows the construction procedure of the steel pipe winding concrete pile which concerns on this embodiment. It is a figure which shows the construction procedure of the steel pipe winding concrete pile which concerns on this embodiment. It is a figure which shows the construction procedure of the steel pipe winding concrete pile which concerns on this embodiment. It is a figure which shows the construction procedure of the steel pipe winding concrete pile which concerns on this embodiment. It is a figure which shows the construction procedure of the steel pipe winding concrete pile which concerns on this embodiment. It is the schematic of the excavation member which concerns on 2nd embodiment of this invention. It is a figure which shows the construction procedure of the concrete pile which concerns on this embodiment. It is a figure which shows the construction procedure of the concrete pile which concerns on this embodiment. It is a figure which shows the construction procedure of the concrete pile which concerns on 3rd embodiment of this invention. It is a figure which shows the construction procedure of the concrete pile which concerns on 3rd embodiment of this invention. It is a figure which shows the construction procedure of the concrete pile which concerns on 3rd embodiment of this invention. It is a figure which shows the construction procedure of the concrete pile which concerns on 3rd embodiment of this invention.

Explanation of symbols

2 Concrete pile construction system 4 Steel pipe 6 Excavating member 8 Full-swivel presser 10 Rotating part 12 Press-in part 14 Reverse excavator 16 Base machine 18 Arm part 20 Rotating press-in part 22 Rod 24 Hydraulic pump 26 Telescopic jack 28 Excavation blade 30 Reverse head 32 Suction port 34 Cylindrical part 36 Wing part 38 Drilling bit 40 Cylindrical part 42 Arm part 44 Rotating part 46 Drilling bit 48 Swivel 50 Suction pump 52 Pile hole 54 Work stage 56 Earth retaining wall 58 Mouth pipe 60 Portal crane 62 Tremy pipe 63 Concrete pile construction system 64 Excavating member 66 Reverse head 68 Rotating bit 70 Reinforcement rod 72 Reinforcement rod C Concrete E Ground E1 Ground that becomes the inner part of the steel pipe E2 Ground that becomes the lower part of the end face of the steel pipe

Claims (10)

A pile construction method of installing a steel pipe in the ground and constructing a pile using this steel pipe,
A drilling member is provided at a position below the lower end of the steel pipe,
A pile construction method, wherein the excavation member and the steel pipe are rotationally driven by separate drive devices, and the steel pipe is press-fitted into the ground while excavating the ground with the excavation member.   2. The pile according to claim 1, wherein the excavation member includes a main excavation portion provided at a lower position inside the steel pipe and a peripheral excavation portion provided at a lower position of an end surface of the steel pipe. Construction method.   The peripheral excavation part is configured to be rotatable inward of the steel pipe, and when the excavation member is pulled up, the peripheral excavation part is brought into contact with the end surface of the steel pipe and is reduced in diameter by rotating inward. 3. The pile construction method according to claim 1, wherein the excavating member is pulled up through the steel pipe in a state.   The peripheral excavation part is configured to be rotatable inside the steel pipe, and when pulling up the excavation member, the peripheral excavation part is rotated in the opposite direction with respect to the excavation rotation direction to reduce the diameter. The pile construction method according to claim 1, wherein the excavation member is pulled up through the steel pipe in this state.   The pile construction method according to any one of claims 1 to 4, wherein concrete is placed in the steel pipe press-fitted into the ground to form a steel pipe wound concrete pile.   The pile construction method according to any one of claims 1 to 4, wherein concrete is placed in the steel pipe press-fitted into the ground and the steel pipe is pulled out. In a pile construction system that installs a steel pipe in the ground and constructs a pile using this steel pipe,
A drilling member attached to a lower position of the lower end of the steel pipe to be rotated and pressed into the ground;
A first drive device for rotationally driving the steel pipe;
A pile construction system comprising a second drive device that drives the excavation member and is separate from the first drive device.   The said excavation member is comprised by the main excavation part provided in the downward position inside the said steel pipe, and the peripheral excavation part provided in the downward position of the end surface of the said steel pipe, The said excavation member is characterized by the above-mentioned. Pile construction system.   The pile according to claim 8, wherein the peripheral excavation part is configured to be rotatable inward of the steel pipe, and when the excavating member is pulled up, the peripheral excavation part contacts the lower end surface of the steel pipe and rotates inward. Construction system. The said peripheral excavation part is comprised so that rotation to the inner side of a steel pipe is possible, and if the said excavation member rotates in the opposite direction with respect to a excavation rotation direction, it will rotate inside. Pile construction system.

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