JP2017166278A - Bar arrangement method in enlarged-bottom part of cast-in-place enlarged-bottom pile and creation method of pile using the bar arrangement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bar arrangement method in an enlarged-bottom part of a cast-in-place enlarged-bottom pile capable of managing the lower side expansion of a reinforced cage for the enlarged-bottom pile on the ground, and a creation method of the enlarged-bottom pile using the bar arrangement method.SOLUTION: A reinforcement bar 7 is closed on the side of a hoop nonexistent area part 6, and a reinforced cage 1 for an enlarged-bottom pile is suspended by a suspension member 18, and is lowered in a drilling hole 34 of the ground 35. A body reinforcement part 2 is arranged in a vertical hole 32, and an enlarged-bottom reinforcement part 3 is arranged in an enlarged-bottom hole 34. When pulling up a suspension member 10, a connection part 16 rises in response to rising of a lifting member 9 while being guided by a main reinforcement 4 of the hoop nonexistent area part 6, and a support reinforcement 11 pushes out the connection part 17 to the outside in the radial direction of the hoop nonexistent area part 6. Since the reinforcement bar 7 is expanded in an enlarged-bottom shape to the outer side in the radial direction than the hoop nonexistent area part 6 with the connection part 8 as the rotational center via a support reinforcement 11, an operator can manage the expansion of the reinforcement bar 7 by confirming a pull-up quantity of the suspension member 10 on the ground. After this bar arrangement method, concrete is poured into the drilling hole, so that an enlarged-bottom part becomes planned strength.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bar arrangement method in an expanded portion of a cast-in-place expanded pile and a pile creation method using the bar arrangement method.

  As for the expanded pile reinforcing bar disclosed in Patent Documents 1 to 4, the bottom of the expanded pile reinforcing bar is lowered from the bottom of the excavated hole as the expanded pile reinforcing bar is lowered to the excavated hole excavated in the ground. It is designed to expand into a widened shape by pushing up. However, the slime at the time of excavation is scattered irregularly at the bottom of the excavation hole, and the bottom of the excavation hole is not flat. Therefore, the thrust from the bottom of the excavation hole that is not flat spreads to the bottom of the reinforcing bar for the expanded pile, but it is not possible to manage whether the lower expansion of the reinforcing bar for the expanded pile on the ground is the planned size. There are drawbacks.

  With reference to FIG. 9, the reinforcing pile 101 for a bottomed pile disclosed in Patent Document 1 will be described. The reinforcing bar 101 for the expanded pile shown in FIG. 9 is provided with a band-free region 105 on the lower side of a cylindrical fixed reinforcing bar 104 composed of a plurality of main bars 102 and a plurality of band bars 103. A cylindrical elevating reinforcing bar portion 108 made up of a plurality of main reinforcing bars 106 and a plurality of band reinforcing bars 107 is housed inside the non-muscle region 105 so as to be movable up and down, and the upper side of the vertically long upper opening and closing reinforcing bars 109 is fixed. A hook 111 provided on the upper opening / closing reinforcing bar 109 is connected to the reinforcing bar 103 of the reinforcing bar part 104 on the side of the reinforcing bar part 105 side of the reinforcing bar part 104 so as to be individually rotatable. The reinforcing bar 107 is supported from below, and the lower side of the lifting and lowering reinforcing bar part 108 protrudes below the fixed reinforcing bar part 104, and a plurality of lower opening / closing reinforcing bars vertically long below the plurality of upper opening / closing reinforcing bars 109. The upper side of 112 Rotatably connected individually forming unit 113, and each of the lower plurality of lower closing rebar 112 is rotatably connected summarized in the center side of the lower lifting rebar portion 108. The plurality of upper opening / closing reinforcing bars 109 are wound around the plurality of upper reinforcing bars 109 so as to be independent from each other at intervals in the vertical direction in a state in which the plurality of band reinforcing bars 114 are reduced in diameter and accumulated in elasticity.

  Based on FIG. 10 thru | or 12, the reinforcement arrangement | positioning method in the bottom expanded part of the cast-in-place bottom pile using the reinforcing bar 101 for bottom expanded pile is demonstrated. First, as shown in FIG. 10, the excavation hole 123 composed of the vertical hole 121 and the bottom expansion hole 122 is excavated in the ground 124, and the reinforcing bar rod 101 for the bottom expansion pile is suspended so that the elevating rebar 108 is on the lower side. It is suspended by the member 125 and lowered to the excavation hole 123. Then, as shown in FIG. 11, the lower side of the lower opening / closing reinforcing bar 112 and the lower side of the elevating reinforcing bar part 108 arrive at the bottom of the bottom expansion hole 122. Next, as shown in FIG. 12, as the bottom expanded pile rebar rod 101 is lowered, the lifted reinforcing bar portion 108 is moved downward relative to the fixed reinforcing bar portion 104 by pushing up from the bottom portion of the bottom expanded hole 122. As it rises, the support of the band reinforcing bar 107 and the hook 111 of the upper opening / closing reinforcing bar 109 in the middle in the vertical direction of the lifting / lowering reinforcing bar part 108 is released, and the connecting part 113 of the upper opening / closing reinforcing bar 109 and the lower opening / closing reinforcing bar 112 is released. Moves outward in the radial direction of the stirrup-free region 105 of the fixed reinforcing bar 104, and the upper open / close rebar 109 spreads out in the shape of a bottom on the outer side in the radial direction than the stirrup-free region 105 around the connecting portion 110. In this way, when the upper opening / closing reinforcing bar 109 expands, the diameter of the upper opening / closing reinforcing bar 109 increases due to the elasticity of the band reinforcement 114 accumulated. Thereafter, concrete (not shown) is poured into the excavation hole 123 and hardened, and the expanded pile 120 in which the expanded pile includes the expanded reinforcing bar 101 is constructed on the ground 124.

  In other words, in the rebar 101 for expanded bottom pile disclosed in Patent Document 1, as shown in FIG. 12, the lower side of the lower opening / closing reinforcing bar 112 and the lower side of the lifted reinforcing bar part 108 are slime during excavation of the expanded bottom hole 122. Is irregularly scattered and lowered to the bottom that is not flat, so that the connecting portion 113 between the upper opening / closing reinforcing bar 109 and the lower opening / closing reinforcing bar 112 is radially outward of the band reinforcing region 104 of the fixed reinforcing bar portion 104. The upper open / close rebar 109 is expanded to the bottom shape. For this reason, there exists a fault which cannot manage the expansion of the upper side opening-and-closing reinforcing bar 109 in the lower side of the reinforcing bar 101 for expanded-bottom piles on the ground.

  In Patent Document 5, the fourth column of Patent Document 5 is inserted in the fourth column, lines 7 to 14, to the bottom of the pile hole 11 with the pile body with the expanded portion b attached to the main reinforcement 1 as shown in FIG. By pressing the engaging portion 6 of the expansion 3 strongly with the expansion device 8, removing the binding portion of the band 5 and restoring and extending it, the expansion arm and the expansion rebar 4 are simultaneously pressed simultaneously. “Expand the reinforcing bar pile part in the enlarged bottom part 11 of the pile hole 11” (shown in FIG. 1). Therefore, in the reinforcing bar for expanded bottom pile disclosed in Patent Document 5, when the expansion operating tool 8 is pushed, the expansion operating tool 8 bends or deforms. There is a drawback that the expansion of the reinforcing bars 4 cannot be managed.

JP 2010-7321 A JP 2005-146777 A JP-A-11-107274 JP-A-7-3783 Japanese Patent Publication No.49-41848

  The present invention has been made in view of the above-described background art, and uses the bar arrangement method at the bottom expansion part of the cast-in-place bottom pile and the bar arrangement method capable of managing the spread of the lower side of the reinforcing bar for the bottom pile on the ground. The purpose is to provide a method for creating the expanded bottom pile.

  The bar arrangement method in the bottom expansion part of the cast-in-place expansion pile according to the present invention includes a main body reinforcement part arranged in a vertical hole in which a reinforcing bar for an expansion pile is excavated in the ground, and a bottom expansion that is excavated below the vertical hole. The main body muscle portion is coupled to each of the plurality of vertically long principal muscles arranged at intervals in the circumferential direction of the longitudinal hole and each of the plurality of principal muscles. And a plurality of band streaks arranged at intervals in the vertical direction of the main bars, and a band streak absent region provided as a part where the band bars are not arranged below the plurality of main bars. Provided with a plurality of vertically long reinforcing bars, a connecting part in which one end of the plurality of reinforcing bars is individually rotatably connected to the plurality of main reinforcing bars, and a lower part than the connecting part. Ascending and descending in the vertical direction on the plurality of main muscles in the region where the band is absent A member, a suspension member that raises the elevating member, and the plurality of reinforcing bars on the outer side in the radial direction from the band-existing region portion with the connecting portion as a rotation center based on the lifting member being lifted by the suspension member The elevating member and a plurality of reinforcing bars rotatably connected to the plurality of reinforcing bars so as to expand into a widened shape, and the plurality of reinforcing bars are absent from the band bars with the connecting portion as a rotation center. Closed on the side of the region part, the reinforcing bar for the expanded bottom pile is hung, the expanded bottom part is disposed to be lowered from the vertical hole to the expanded bottom hole, and the lifting member is raised with the lifting of the hanging member The plurality of reinforcing bars are expanded in a bottomed shape radially outward from the band reinforcement absent region portion with the connecting portion as a center of rotation via the support bars. The method for producing a cast-in-place expanded pile according to the present invention is characterized in that, after the bar arrangement method, the expanded portion is created by pouring concrete into an excavation hole.

  In the bar arrangement method for the bottom expansion portion of the cast-in-place expanded pile according to the present invention, the expansion of the plurality of reinforcing bars in the reinforcing bar for the expanded pile is determined according to the amount by which the suspension member is pulled up. There is an effect that it is possible to manage the expansion of a plurality of reinforcing bars by grasping the amount to be pulled up. In the bar arrangement method in the bottom expansion part of the cast-in-place bottom pile according to the present invention, if the elevating member rises while being guided to the main reinforcement, the elevating member rises smoothly. In the bar arrangement method of the bottom expansion portion of the cast-in-place expanded pile according to the present invention, the connecting portion in which the plurality of reinforcing bars are individually connected to the plurality of main bars so as to be rotatable is above the elevating member, If it is provided on the fixing member fixed to the main bar, the fixing member has an effect of suppressing the bending of the main bar in the radial direction in the region where the band is absent. In the present invention, it comprises a spiral muscle that is spirally wound in the vertical direction on the inner periphery or outer periphery of a plurality of reinforcement bars, one of the upper side or the lower side of the spiral muscles is fixed to at least one reinforcement bar, If the portion other than the fixed portion of the spiral muscle is configured to move to the fixed side of the auxiliary muscle as the plurality of reinforcing bars expand, the diameter of the spiral muscle increases as the plurality of reinforcing bars expand. The reinforcing effect is improved by spreading outward in the direction and restraining a plurality of reinforcing bars. In the method for creating the cast-in-place expanded pile according to the present invention, after the above bar arrangement method, the bottom portion is created by pouring concrete into the excavation hole, so that the plurality of reinforcing bars whose expansion is controlled are made of concrete. It is embedded in the widened portion, and the bottomed portion has the effect of achieving the planned strength.

  The summary of the invention does not list all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a state in which a reinforcing bar for a bottom-pile expanded pile according to Embodiment 1 for carrying out the present invention is expanded at a bottom portion, and FIG. FIG. 4 is a longitudinal sectional view showing a state in which the bottom reinforcement part of the reinforcing bar for the bottom extension pile is expanded. The perspective view which showed the reinforcing bar rod for expanded-pile according to the form 1 for implementing this invention. The perspective view which showed the reinforcing bar rod for expanded-pile according to the form 2 for implementing this invention. The longitudinal cross-sectional view which showed the state which suspended the reinforcing bar rod for expanded bottom piles concerning the form 2 for implementing this invention in the excavation hole. The longitudinal cross-sectional view which showed the state which expanded the bottom expansion muscle part which concerns on the form 2 for implementing this invention. The perspective view which showed the reinforcing bar rod for expanded piles concerning the form 3 for implementing this invention. The longitudinal cross-sectional view which showed the state which suspended the reinforcing bar rod for expanded bottom piles concerning the form 3 for implementing this invention in the excavation hole. The longitudinal cross-sectional view which showed the state which expanded the bottom expansion muscle part which concerns on the form 3 for implementing this invention. The perspective view which shows the conventional reinforcing bar for expanded bottom pile disclosed by patent document 1. FIG. The installation process figure of the conventional reinforcing bar for expanded bottom pile. The installation process figure of the conventional reinforcing bar for expanded bottom pile. The installation process figure of the conventional reinforcing bar for expanded bottom pile.

  With reference to FIG. 2, the reinforcing bar rod 1 for a bottomed pile used for the bar arrangement method in the bottom expanded portion of the cast-in-place expanded pile according to the first embodiment for carrying out the present invention will be described. The bottomed pile reinforcing bar 1 shown in FIG. 2 includes a main body reinforcing part 2 and a bottomed reinforcing part 3. The main body reinforcing part 2 includes a main reinforcing bar 4 made of a plurality of vertically long reinforcing bars, a plurality of band reinforcing bars 5 made of reinforcing bars, and a band non-existing region part 6. The number of the main muscles 4 is not limited to four, and can be applied if it is three or more. The main reinforcing bars 4 are arranged on one circumference centering on the center of the reinforcing bar rod 1 for bottomed pile with a space in the circumferential direction centering on the center of the reinforcing bar rod 1 for bottomed pile as viewed from the plane. One circumference around the center of the reinforcing bar 1 for the expanded pile is applicable to either a circle or a polygon similar to a circle. The band 5 has a cylindrical shape when viewed from the plane, and is coupled to each of the plurality of main bars 4 and arranged at intervals in the vertical direction of the main body bar 2. In order to allow the elevating member 9 to move in the vertical direction, the band absence region 6 is provided as a portion where the main bar 4 is present below the main bar 4 but the band bar 5 is not disposed.

  The widening reinforcing bar portion 3 includes a plurality of vertically long reinforcing bars 7 made of reinforcing bars, a plurality of connecting parts 8, a lifting member 9, a suspension member 10, and a plurality of supporting bars 11 made of reinforcing bars. The number of reinforcing bars 7 is not limited to four, and three or more reinforcing bars are applicable. The reinforcing bars 7 are arranged on one circumference centered on the center of the reinforcing bar rod 1 for the expanded pile with a space equal to the circumferential direction centering on the center of the reinforcing bar rod 1 for the expanded pile as viewed from the plane. . One circumference around the center of the reinforcing bar 1 for the expanded pile is applicable to either a circle or a polygon similar to a circle.

  The plurality of connecting portions 8 can be applied without the cylindrical fixing member 12 as long as the reinforcing bars 7 are individually connected to the upper side of the main reinforcing bars 4 of the band absence region 6 so as to be rotatable. The aspect in which the some connection part 8 was provided via the fixing member 12 fixed to the main reinforcement 4 was illustrated. Specifically, the plurality of main bars 4 are fitted in the fixing member 12 in the vertical direction at equal intervals in the circumferential direction, and the fixing member 12 is disposed on the upper side of the band-bar absence region portion 6 and fixed to the main bar 4. The member 12 is fixed to each other, and the connecting portion 8 is provided on the fixing member 12 at equal intervals in the circumferential direction, so that the connecting portion 8 connects the one end of the reinforcing bar 7 to the main reinforcing bar 4 via the fixing member 12. Connect individually and rotatably. The structure in which the connecting portion 8 is provided on the fixing member 12 can be conceptually synonymous with the structure in which the connecting portion 8 is fixed to the upper side of the band 6 absence region 6 of the main muscle 4 via the fixing member 12. The fixing member 12 can be applied even if it is composed of the band 5.

  The elevating member 9 has a cylindrical shape when viewed from above, and is provided on the main muscle 4 so as to be able to be raised and lowered in the band reinforcement absent region 6. The elevating member 9 can be applied even if it is composed of the band 5. The case where the plurality of main bars 4 are fitted to the elevating member 9 so as to be able to be raised and lowered at equal intervals in the circumferential direction of the elevating member 9 is illustrated. Thus, by the structure by which the main reinforcement 4 and the raising / lowering member 9 were mutually fitted, the raising / lowering member 9 does not move to the circumferential direction of the raising / lowering member 9, but the reinforcement | strengthening reinforcement 7 uses the connection part 8 as a rotation center, and is a band | gap reinforcement absence area | region. When expanding to the outside of the part 6 in the shape of an expanded bottom, the elevating member 9 supports the main muscle 4 from the radial inner side of the band reinforcement absent region 6, and the main muscle 4 does not flex radially inward of the band reinforcement absent region 6, The reinforcing bar 7 is smoothly spread by the support bar 11 as the elevating member 9 is raised.

  Since the portions of the plurality of main muscles 4 that protrude downward from the band reinforcement absent region portion 6 are connected to each other by the cylindrical lower band muscles 13 as seen from the plane, they are connected to each other than the band reinforcement absent region portion 6 of the principal muscle 4. The lower side does not expand or narrow in the radial direction, and the elevating member 9 can be raised and lowered smoothly. The lower band 13 is made of a reinforcing bar and is illustrated as being coupled to the outside of the main muscle 4, but can be applied even when coupled to the inside of the main muscle 4, and is not limited to one, and may be a plurality. Applicable. The lower band 13 is applicable even if it is composed of the band 5.

  The suspension member 10 is a tool for lifting the elevating member 9 on the ground 36 side, and is made of a steel wire or a steel rod such as a wire rope or a wire cable. The branch portion 14 divided into a plurality of suspension members 10 is individually attached to an attachment portion 15 provided in the lift member 9 with an equal interval in the circumferential direction of the lift member 9, and is higher than the lift member 9 of the branch portion 14. An example is shown in which the upper side is gathered on the center side of the band streak-free region portion 6 and joined together, and the portions extending upward from the joining portion of the suspension member 10 are combined into one. According to this configuration, when the portion that extends upward from the joint portion of the suspension member 10 and is combined into one is wound up by a hoist such as a winch (not shown) installed on the ground 36 side, the elevating member 9 Is pulled up smoothly in a horizontal state with respect to the plurality of main muscles 4.

  A configuration in which a plurality of suspension members 10 are wound up on a hoisting machine without being combined into one at the branch portion 14 is also applicable. Although the attachment part 15 illustrated the structure which protruded to the raising / lowering member 9, the hole formed in the raising / lowering member 9 is applicable.

  The support bar 11 is reinforced with the reinforcing bar 7 so that the reinforcing bar 7 expands radially outward from the band-bar-existing region part 6 with the connecting part 8 as the rotation center based on the lifting member 9 being lifted by the suspension member 10. And the lifting member 9 are rotatably connected. Specifically, one end of the support bar 11 is rotatably connected to the elevating member 9 by the connecting part 16, and the other end part of the support bar 11 is rotatably connected to the reinforcing bar 7 by the connecting part 17. 7 is a structure in which the connecting portion 16 is located below the connecting portion 17 when it hangs downward on the side of the band reinforcement absent region 6 around the connecting portion 8 with the main muscle 4.

  The bar arrangement method in the bottom expansion part of the cast-in-place expansion bottom pile using the reinforcing bar rod 1 for bottom expansion pile which concerns on the form 1 for implementing this invention using FIG. 1 is demonstrated. In FIG. 1, the reinforcing bar for expanded bottom pile 1 is illustrated as a side view, and the excavation hole 34 is illustrated as a longitudinal sectional view. As shown in FIG. 1 a, an excavation hole 34 composed of an upper vertical hole 32 and a lower bottom expansion hole 33 is excavated in the ground 35 while receiving a stable liquid such as bentonite and the bottom expansion on the ground 36. The pile reinforcing bar 1 is hung by a hanging member 18 made of a steel wire or a steel rod such as a wire rope or wire cable, and the bottom-up pile reinforcing bar 1 is placed at the true position of the excavation hole 34 so that the elevating member 9 is on the lower side. When it reaches the top, the suspension member 18 is unwound from the hoisting machine.

  When the bottomed pile reinforcing bar 1 is lowered into the excavation hole 34 by the weight of the bottomed pile reinforcing bar 1, the reinforcing bars 7 and the supporting bars 11 are not provided in the band reinforcement region 6 due to the weight of the plurality of reinforcing bars 7. Closed on the side. Then, the rebar 1 for the bottomed pile is lowered to the excavation hole 34 with the bottomed rebar 3 facing down, the main body rebar 2 is disposed in the vertical hole 32, and the bottom rebar 3 is the bottom 37 of the bottomed hole 33 and The bottom-up pile reinforcing bar 1 is arranged in a suspended manner in the excavation hole 34 without being in contact with the ground 35, and is arranged in the bottom-up hole 33 apart from the peripheral wall portion 38. That is, the bottom 37 side of the bottom expansion hole 33 is a support layer as a hard ground 35 a that can withstand the weight of the upper structure constructed on the bottom expansion pile 31. The hard ground 35a is a layer below the imaginary line in FIG. The support force of the bottom expanded pile 31 is proportional to the bottom area of the bottom expanded portion constructed in the bottom expanded hole 33 of the bottom expanded pile 31.

  As described above, when the bottom reinforcing bar rebar 1 is lowered into the excavation hole 34 by its own weight, the lifting member 10 is unwound from the hoist so that the elevating member 9 does not rise. Then, due to the weight of the plurality of reinforcing bars 7, the plurality of reinforcing bars 7 are closed on the side of the band streak absent region 6 with the connecting portion 8 as the rotation center, and the plurality of supporting bars 11 are connected to the connecting portion 16. The connecting portion 16 is located below the connecting portion 17 while being closed on the side of the strapless region 6 with the connecting portion 17 as the center of rotation.

  Next, as shown in FIG. 1b, the rebar 1 for the bottomed pile is lowered into the excavation hole 34 by its own weight of the rebar 1 for the bottomed pile, and suspended while being suspended in the vertical direction. When the member 10 is wound up by the hoisting machine, the elevating member 9 rises horizontally while being guided by the main reinforcement 4 of the band-stripe absence region portion 6, and the support muscle 11 is connected to the connection portion 17 as the connection portion 16 rises. Is pushed outward in the radial direction of the band-existing region 6, and the reinforcing bar 7 is expanded in the shape of an expanded bottom to the outer side in the radial direction than the band-existing region 6 with the connecting portion 8 as the rotation center via the support bar 11. When the included angle between the support muscle 11 and the main muscle 4 is 90 degrees, the included angle between the reinforcing muscle 7 and the main muscle 4 is maximized, but when the included angle between the support muscle 11 and the main muscle 4 is an obtuse angle, the reinforcement is performed. Since the included angle between the muscle 7 and the main muscle 4 decreases, the ascending distance of the elevating member 9 increases, but the ascending limit position of the elevating member 9 with respect to the main muscle 4 is 90 degrees between the supporting muscle 11 and the main muscle 4. It is not limited to the position.

  Since the expansion of the reinforcing bar 7 is determined in accordance with the amount of the hoisting member 10 that is wound up, the operator can grasp the amount by which the hoisting member 10 is pulled up on the ground 36 and manage the expansion of the reinforcing bar 7. . For example, after the excavation hole 34 shown in FIG. 2 is excavated in the ground 35, for example, an ultrasonic wall measuring device as a measuring instrument (not shown) is inserted into the bottom expansion hole 33 from the ground 36 through the vertical hole 32. Then, the depth and diameter of the bottom expansion hole 33 are measured, and based on the measured depth and diameter, the operator grasps the amount by which the suspension member 10 shown in FIG. it can.

  As shown in FIG. 1 b, the reinforcing bar 7 is illustrated in a state where the reinforcing bar 7 is expanded in the shape of the bottom expanded radially outward from the band streak-free region part 6 with the connecting part 8 as the rotation center via the support bar 11. An unfinished tremely pipe is inserted into the excavation hole 34 from the ground 36, and concrete (not shown) is poured into the excavation hole 34 from the tremey pipe and set, and the expanded pile 31 encloses the reinforcing bar 1 for the expanded pile. It is built on the ground 35. After the bottomed pile 31 is constructed, at the part close to the bottomed pile 31, the hanging member 10 and the hanging member 18 are removed or cut by the operator, and the part protruding from the widened pile 31 is removed. When the concrete is poured into the excavation hole 34, the reinforcing bar 1 for the expanded pile does not come into contact with the ground 35, so the reinforcing bar 1 for the expanded pile is not exposed to the outside from the expanded pile 31 and the rust prevention of the reinforcing bar 1 for the expanded pile. Is retained. In addition, as shown in FIG. 1 b, the structure in which the strap 5 is not provided in the space 6 a between the strap reinforcing region 6 and the fixing member 12 is illustrated. Since the space 6 a between the members 12 is not related to the vertical movement of the elevating member 9, the belt 5 connected to the plurality of main muscles 4 is also formed 6 a between the belt absence region 6 and the fixing member 12. Is provided, the upper side of the main muscle 4 with respect to the band strip absence region 6 does not expand or narrow in the radial direction, and the elevation member 9 can be smoothly raised and lowered.

  With reference to FIG. 3, a reinforcing bar rod 1 for a bottomed pile according to Embodiment 2 for carrying out the present invention will be described. 3 is different from the reinforcing bar rod 1 for the expanded pile shown in FIG. 2 in that the reinforcing bar rod 1 for the expanded pile shown in FIG. The spiral muscle 21 is spirally wound around the inner circumference or the outer circumference of the plurality of reinforcing bars 7 with a space in the vertical direction, and the upper side, for example, one end of the spiral muscle 21 is fixed to the main body muscle portion 2 or the expanded bottom muscle portion 3. Thus, the portion other than the fixed portion of the spiral muscle 21 moves to the fixed side as the plurality of reinforcing bars 7 expand. As the portion to which the upper side of the spiral muscle 21 is fixed, any one of the main muscle 4, the band reinforcement 5, the fixing member 12, the connecting portion 8, the reinforcing muscle 7, and the guide member 24 can be applied. As a fixing means of the spiral muscle 21, it is possible to apply a screw member such as welding, a bolt, or a hook formed on the upper end of the spiral muscle 21.

  In each of the plurality of reinforcing bars 7, a plurality of guide members 24 are fixedly provided at positions that maintain a vertical space in the spiral shape around which the spiral bars 21 are wound. A guide hole 25 is formed in which the spiral muscle 21 is movably fitted in a direction extending in a spiral shape of the spiral muscle 21. The spiral muscles 21 are sequentially fitted from the uppermost guide hole 25 to the lowermost guide hole 25 and wound in a spiral manner across the adjacent reinforcing bars 7.

  The extension 23 protruding outside the lowermost guide hole 25 of the spiral muscle 21 is spirally wound over the outer periphery of the plurality of reinforcing bars 7 without passing through the guide hole 25. Then, when the reinforcing bar 7 expands as the elevating member 9 rises, the reinforcing bar 7 that expands by being pulled toward the fixed part side of the main body muscle part 2 or the bottomed muscle part 3 other than the part where the spiral muscle 21 is fixed. The reinforcing bars 7 are appropriately spread while moving while sliding and maintaining the spiral shape of the spiral bars 21.

  Based on FIGS. 4 and 5, a bar arrangement method in the bottom expanded portion of the cast-in-place expanded pile using the reinforcing bar 1 for expanded floor pile according to the embodiment 2 for carrying out the present invention will be described. 4 and 5, the bottomed pile reinforcing bar 1 is shown as a side view, and the excavation hole 34 is shown as a longitudinal sectional view. As shown in FIG. 4, when the excavation hole 34 is excavated in the ground 35 and the bottom expanded pile reinforcing bar 1 is suspended on the ground 36 by the suspension member 18 and lowered to the excavation hole 34, a plurality of reinforcing bars 7 are provided. Are closed to the side of the plurality of reinforcing bars 7, the plurality of supporting bars 11, and the band absence region portion 6. Then, the reinforcing bar 1 for the bottomed pile is lowered to the excavation hole 34, the main body reinforcing part 2 is arranged in the vertical hole 32, and the bottomed reinforcing part 3 is separated from the bottom 37 and the peripheral wall part of the bottoming hole 33. The bottom-extended pile reinforcing bar 1 is suspended in the excavation hole 34 without contacting the ground 35.

  Next, as shown in FIG. 5, the rebar 1 for the bottomed pile is lowered into the excavation hole 34 by its own weight and is suspended in the air without moving up and down. As it is rolled up, the elevating member 9 rises horizontally while being guided by the main muscle 4 of the band reinforcement absent region portion 6, and the reinforcing bar 7 is connected to the connection portion 8 via the support muscle 11 and the band reinforcement absent region portion. When expanding into the bottom expanded shape radially outward from 6, the portion other than the fixed portion of the spiral muscle 21 is pulled to the fixed portion side of the main body muscle portion 2 or the bottom expanded muscle portion 3 to slide the reinforcing reinforcement 7 that expands. While being moved and guided to the guide hole 25, the spiral hole 21 is attracted to the fixed side while maintaining a helical interval.

  After that, while the reinforcing bar 7 is expanded to the bottom shape, the concrete (not shown) is poured into the excavation hole 34 from the tremy pipe (not shown) and hardened, and the bottom pile 31 includes the reinforcing bar 1 for the bottom pile. After the bottom expanded pile 31 is constructed on the ground 35, the suspension member 18 and the suspension member 10 are removed by the operator or cut off from the expanded bottom pile 31 at a portion close to the bottom expanded pile 31. Part is removed. When the concrete is poured into the excavation hole 34, the reinforcing bar 1 for the expanded pile does not come into contact with the ground 35, so the reinforcing bar 1 for the expanded pile is not exposed to the outside from the expanded pile 31 and the rust prevention of the reinforcing bar 1 for the expanded pile. Is retained.

  With reference to Fig. 6, a reinforcing bar rod 1 for a bottomed pile according to a third embodiment for carrying out the present invention will be described. In the bottomed pile reinforcing bar 1 shown in FIG. 6, the lower side, for example, the other end of the spiral bar 21 is fixed to the main body bar 2 or the bottom bar 3, and the extension 23 of the spiral bar 21 is the uppermost guide hole. 25 is a portion that protrudes outward from the uppermost guide hole 25 and is spirally wound around the outer periphery of any of the main reinforcement 4, the reinforcing reinforcement 7, the attachment portion 15, and the guide member 24. 3 is different from the reinforcing bar rod 1 for expanded bottom pile shown in FIG. As the portion to which the lower side of the spiral muscle 21 is fixed, any of the main muscle 4, the reinforcing bar 7, the lower band muscle 13, the attachment portion 15, the connecting portion 16, and the guide member 24 is applicable. As a fixing means of the spiral muscle 21, it is possible to apply a screw member such as welding, a bolt, or a hook formed on the lower end of the spiral muscle 21.

  Based on FIGS. 7 and 8, a reinforcing bar arrangement method in the bottom expansion portion of the cast-in-place bottom pile using the bottom reinforcing pile reinforcing rod 1 according to the third embodiment for carrying out the present invention will be described. In FIGS. 7 and 8, the bottomed pile reinforcing bar 1 is shown as a side view, and the excavation hole 34 is shown as a vertical cross-sectional view. As shown in FIG. 7, the excavation hole 34 is excavated in the ground 35, and the bottom reinforcement pile is in a state in which the reinforcement bars 7 and the support bars 11 are closed to the side of the band reinforcement absence region 6 by the weight of the reinforcement bars 7. The reinforcing bar 1 is lowered to the excavation hole 34 by the suspending member 18, the main body reinforcing part 2 is arranged in the vertical hole 32, and the expanded base part 3 is separated from the bottom part 37 and the peripheral wall part 38 of the expanded base hole 33. The bottom-extended pile reinforcing bar 1 is suspended in the excavation hole 34 without contacting the ground 35.

  Then, as shown in FIG. 8, the hoisting member 10 is rolled up while the bottomed reinforcing bar 1 is lowered into the excavation hole 34 by its own weight and is not suspended in the vertical direction. Along with this, the elevating member 9 rises horizontally while being guided by the main muscle 4 of the band reinforcement absent region portion 6, and the reinforcing bar 7 is connected to the connection portion 8 via the support muscle 11 and the band reinforcement absent region portion 6. When the portion expands to the outer side in the radial direction, the portion other than the fixed portion of the spiral muscle 21 is pulled to the fixed portion side with the main body muscle portion 2 or the bottom portion muscle portion 3 while sliding the reinforcing reinforcement 7 that expands. While being moved and guided to the guide hole 25, the spiral hole 21 is attracted to the fixed side while maintaining the helical interval.

  After that, the concrete not shown is poured into the excavation hole 34 from the tremy pipe (not shown) while being expanded in the shape of the bottom of the reinforcing bar 7, and the bottomed pile 31 includes the reinforcing bar 1 for the bottom pile. After being constructed on the ground 35 in a state where the bottom expanded pile 31 is constructed, the suspension member 18 and the suspension member 10 are removed or cut by the operator at the portion near the bottom expanded pile 31 and come out of the bottom expanded pile 31. Part is removed. When the concrete is poured into the excavation hole 34, the reinforcing bar 1 for the expanded pile does not come into contact with the ground 35, so the reinforcing bar 1 for the expanded pile is not exposed to the outside from the expanded pile 31 and the rust prevention of the reinforcing bar 1 for the expanded pile. Is retained.

  2, 4, and 7, when the bottomed pile reinforcing bar 1 is configured to hold the reinforcing bar 7 in an expanded state, it is illustrated at the tip of the branch portion 14 of the suspension member 10. The hook of the suspension member 10 is slightly lowered before the concrete (not shown) is poured from the tremmy pipe into the excavation hole 34 with the reinforcing bar 7 being expanded. A configuration in which the lifting member 9 is removed from the attachment portion 15 is also applicable.

  In the expanded pile reinforcing bar 1 shown in FIGS. 3 and 7, a plurality of spiral bars 21 can be applied. When a plurality of spiral muscles 21 are used, one spiral muscle 21 is fixed on the upper side as shown in FIG. 3 or the lower side as shown in FIG. It is applicable if either the upper side, the lower side or the middle part is fixed to the main body muscle part 2 or the expanded bottom muscle part 3.

  3 and 6, the guide member 24 is unnecessary unless the vertical spacing of the spiral bars 21 is defined.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the embodiment. It is apparent from the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Reinforcement rod for bottom expansion pile 2 Main part muscle part 3 Bottom reinforcement part 4 Main reinforcement 5 Band reinforcement 6 Band reinforcement absent region part 7 Reinforcement reinforcement 8 Connection part 9 Lifting member 10 Suspension member 11 Supporting muscle 12 Fixing member 13 Lower belt reinforcement 14 Branch part DESCRIPTION OF SYMBOLS 15 Attachment part 16 Connection part 17 Connection part 21 Spiral muscle 23 Extension part 24 Guide member 25 Guide hole 31 Expanded pile 32 Vertical hole 33 Expanded hole 34 Excavation hole 35 Ground 36 Ground 37 Bottom part 38 Peripheral wall part

Claims (5)

  The reinforcing bar for the expanded-pile pile includes a main body reinforcing part disposed in a vertical hole excavated in the ground, and a widened reinforcing bar part disposed in the expanded bottom hole excavated below the vertical hole. , A plurality of longitudinal main bars arranged at intervals in the circumferential direction of the vertical hole, and a plurality of main bars coupled to each of the plurality of main bars and arranged at intervals in the vertical direction of the main bars. A band streak, and a band streak-free region portion provided as a portion where the band streak is not disposed on the lower side of the plurality of main bars, and the bottom expansion muscle portion includes a plurality of vertically long reinforcing bars, A connecting portion in which one end portions of the plurality of reinforcing bars are individually connected to the plurality of main reinforcing bars so as to be rotatable, and the plurality of main reinforcing bars in the band reinforcement absent region portion below the connecting portion. A lifting member provided so as to be capable of being lifted and lowered, a suspension member for lifting the lifting member, and the suspension The lifting members and the plurality of reinforcing bars are expanded in a bottomed shape radially outward from the band streak-free region portion with the connecting portion as a rotation center based on the lifting of the lifting member by the material. A reinforcing bar that is rotatably connected to the reinforcing bar, and the plurality of reinforcing bars are closed on the side of the band-bar-free region with the connecting part as a rotation center, Is suspended from the vertical hole to the bottom expansion hole, and the lifting member is lifted by the lifting member, and the plurality of reinforcing bars are interposed via the support bars. The bar arrangement method in the bottom-expansion part of a cast-in-place expansion pile characterized by expanding in the bottom expansion shape to the radial direction outer side rather than the said band reinforcement absence area | region part centering on the said connection part.   The bar arrangement method in the bottom expansion part of the cast-in-place bottom pile according to claim 1, wherein the elevating member rises while being guided by the main reinforcement.   The said connection part which connected the said several reinforcement bar | burr individually with the said several main bar | burr so that rotation was possible was provided in the fixing member fixed to the said main bar above the said raising / lowering member, It is characterized by the above-mentioned. A bar arrangement method in the bottom expanded portion of the cast-in-place expanded-pile according to 1 or 2.   Comprising a spiral muscle that is spirally wound in the vertical direction on the inner circumference or outer circumference of the plurality of reinforcing bars, one of the upper side or the lower side of the spiral muscle is fixed to the main body muscle part or the bottom-up muscle part, 4. The structure according to claim 1, wherein the portion other than the portion where the spiral muscle is fixed is configured to move to the fixing side of the auxiliary muscle as a plurality of reinforcing bars expand. 5. The bar arrangement method in the bottom expansion part of the cast-in-place expansion pile described in 1.   A method for producing a cast-in-place expanded pile, wherein after the bar arrangement method using any one of claims 1 to 4, a bottom expansion portion is formed by pouring concrete into an excavation hole.