JP2016118027A - Anti-lifting assembly of rebar cage, rebar cage and construction method of cast-in-place pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-lifting assembly of a rebar cage, the assembly that can be assembled simply and quickly with good workability in the rebar cage, and can prevent co-rise and uplift of the rebar cage in the construction of a pile foundation.SOLUTION: An anti-lifting assembly 10 is provided which is assembled in the lower end of a rebar cage 1 for preventing the lifting of the rebar cage built up in a pile hole in the construction of a cast-in-place pile. The anti-lifting assembly is equipped with multiple anti-lifting reinforcements 11 radially disposed from the lower end central part of the rebar cage 1, a supporting member 20 for supporting one end of the multiple anti-lifting reinforcements 11 in the lower end central part of the rebar cage 1, and a fixing bracket 30 for fixing the other ends of multiple anti-lifting reinforcements 11 to the rebar cage 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for constructing an assembly for preventing a rise of a reinforcing bar, a reinforcing bar, and a cast-in-place pile, and more specifically, in the process of constructing a foundation of a structure by a cast-in-place pile, The present invention relates to a method for constructing an assembling body for preventing the ascent of a reinforcing bar to be assembled to the reinforcing bar, a reinforcing bar, and a cast-in-place pile.

  In the construction site of a structure, a construction method is generally adopted in which a pile is driven into the ground to form a pile foundation that supports the structure in order to increase the seismic strength of the structure. One of the pile foundation construction methods is a cast-in-place pile construction method. The cast-in-place pile is formed by placing a rebar rod assembled in a cylindrical shape in a drilled hole, and then driving the concrete into the pile hole and solidifying it.

There are several construction methods such as an all-casing construction method, an earth drill construction method, and a reverse construction method, depending on the method of excavating the ground and the like.
The all casing method is constructed in the following order. First, the excavator is installed horizontally on the ground, and the center of the casing tube and the pile core are aligned. Next, the casing tube is rocked (rotated) over the entire length of excavation, and the sand and sand in the casing tube is excavated with a hammer magnet while being pushed in. After confirming the support layer, root excavation is performed.

  After completion of the bottom roughening by the hammaglab, the precipitation bucket is put into the bottom of the hole, and after waiting for the precipitation, it is pulled up together with the slime. Next, the reinforcing rods assembled on the ground are built vertically in the center of the hole. Thereafter, the treme tube is inserted into the hole, concrete is poured from the treme tube, and the concrete is driven into the hole. The casing tube and the tremy tube are pulled out and collected while pouring concrete. After that, the back dug portion is backfilled to finish the work.

  In the all casing method, since the hole wall is protected by the casing tube made of steel plate, there is little influence on the collapse of the hole wall and adjacent structures, and excavation can be performed relatively easily. There is a merit that it is also advantageous for environmental conservation measures such as considerations.

  However, the inner wall surface of the casing tube and the outer peripheral surface of the reinforcing bar rod are designed to ensure a predetermined concrete cover thickness, but the inclination of the casing tube and the reinforcing rod rod, the inner wall surface of the casing tube Spacers (metal fittings) attached to the outer peripheral surface of the reinforcing bar to secure a predetermined concrete cover thickness due to poor cleaning (adherence of concrete or earth and sand), unevenness of the inner wall surface of the casing tube, and the casing tube May come into contact.

  When the casing tube is pulled out in a state where the casing tube and the reinforcing bar rod (the spacer) are in contact with each other, there may be a co-up phenomenon in which the reinforcing bar rod is lifted together with the casing tube.

  If the above-mentioned phenomenon of co-up of reinforcing bars does not stop, it is necessary to take measures such as removing the reinforcing bars and concrete and reconstructing them, or building reinforcing piles in adjacent locations. There was a problem that it took.

  Therefore, in order to prevent the above-described phenomenon of re-coiling of the reinforcing bar rods, conventionally, a method of attaching a reinforcing bar member to the lowermost end portion of the reinforcing bar rods in a cross-beam shape has been adopted. For example, a U-shaped rebar that has a length (string length) that connects two points (two main bars) on the bottom circumference of the rebar rod, and is bent at both ends at a substantially right angle. A predetermined number of bar-shaped bars) are prepared, and the U-shaped reinforcing bars are arranged at the bottom end of the assembled reinforcing bar rod in a cross-girder shape, and both ends of each U-shaped reinforcing bar are tied to the main bar of the reinforcing bar rod with a wire. In addition, the crossing portions of the U-shaped reinforcing bars are bound together by a wire and assembled to the reinforcing bar rod.

  Moreover, FIG. 7 is the figure which showed the reinforcing bar rod with which the cross-beam-shaped reinforcing bar frame disclosed by the following patent document 1 was attached, (a) is a longitudinal cross-sectional view which shows the reinforcing bar rod built in the hole, (B) is the bb sectional view taken on the line in (a).

  In order to prevent the rebar rod 50 from rising, a cross-beam-shaped rebar frame in which twelve long and short rebars are assembled in a cross-girder shape at the hoop bar 52 at the lowermost end that is attached to intersect with the main bar 51 constituting the rebar rod 50. 53 is welded. In addition, spacers 54 for securing and adjusting the concrete cover thickness are mounted on the outer peripheral surface of the reinforcing bar 50 at predetermined intervals, and an annular floor slab concrete block 55 is provided at the bottom of the reinforcing bar 50. Are connected. The floor slab concrete block 55 is disposed in the bottom portion 56.

  By assembling the cross-girder rebar frame 53 to the lower end of the rebar rod 50, when the casing tube is pulled out, the cross-girder rebar frame 53 embedded in the concrete becomes resistance to the pull-out direction, It is possible to prevent the phenomenon.

  However, in the method of assembling the cross beam-shaped reinforcing bar frame 53 to the lower end portion of the reinforcing bar 50 as described above, the length (string length) connecting two points on the bottom circumference of the reinforcing bar 50 is on the circumference. Since it differs depending on the position, it is necessary to prepare rebar members with different lengths corresponding to the mounting position, and it takes time to manufacture them, and the actually assembled rebar rod and the rebar on the design drawing With the scissors, errors often occur in the position of the main bars and the diameter of the reinforcing bar scissors, and there is a case where the previously prepared reinforcing bar members and the cross-girder-shaped reinforcing bar frame 53 may not be assembled at desired positions. was there.

  In addition, at the stage of assembling the reinforcing bar rod, both ends of the U-shaped reinforcing bar were bound to the main reinforcing bar rod with a number wire, and the intersections of these U-shaped reinforcing bars were bound to each other with a number line. The assembly work requires labor, and if the binding state is insufficient, the wire is loosened, and the U-shaped reinforcing bars may come off from the reinforcing bar rods.

  Further, in the method described in Patent Document 1, since the cross-girder-shaped reinforcing bar frame 53 is joined to the hoop bar 52 of the reinforcing bar 50 by welding, the work can be performed only by a welding operator and can be easily assembled to the reinforcing bar 50. There was a problem that it was not possible. Further, the welding work to the reinforcing bar 50 is being prohibited because it impairs the properties (strength and the like) of the reinforcing bar as a base material, and there is a problem that it is difficult to employ.

Utility Model Registration No. 3160485

Means for solving the problems and their effects

  The present invention has been made in view of the above-described problem, and can be easily and quickly assembled to a reinforcing bar with good workability, and prevents the reinforcing bar from rising or rising when constructing a pile foundation. The purpose of the present invention is to provide a method for constructing an assembly for preventing the rise of reinforcing steel rods, reinforcing rods and cast-in-place piles.

  In order to achieve the above-mentioned object, the assembly (1) for preventing the rise of the reinforcing bar according to the present invention has the above-mentioned reinforcing bar in order to prevent the rise of the reinforcing bar built in the pile hole when the cast-in-place pile is constructed. An assembly for preventing ascent of the reinforcing bar rod to be assembled to the lower end portion of the rod, and a plurality of rising preventing bars arranged radially from the lower end central portion of the reinforcing bar rod, It is characterized by comprising a support member for supporting one end portion of the ascent prevention bars and a fixing bracket for fixing the other end portions of the plurality of ascent prevention bars to the reinforcing bar rod.

  According to the assembly (1) for preventing the reinforcing bar rod from rising, the plurality of rising prevention members are arranged at the lower end central portion of the reinforcing rod rod and radially arranged from the lower end central portion of the reinforcing rod rod. One end of a bar is supported by the support member, and the other end of the plurality of rising prevention bars is fixed to the reinforcing bar rod by the fixing bracket, so that the reinforcing bar member can be It is possible to easily and quickly assemble the connecting part of the crossing and the reinforcing bar to the lower end of the reinforcing bar without tie or welding the wire, and to raise and float the reinforcing bar when constructing the pile foundation Can be reliably prevented.

  Moreover, the assembly (2) for the reinforcement prevention of the reinforcing rod according to the present invention is the assembly for preventing the reinforcement of the reinforcing rod (1), wherein the plurality of the prevention rods are larger than the radius of the reinforcement reinforcement. It is composed of an L-shaped bar with a short length and the other end bent, and the fixing bracket fixes the rise prevention bar to a reinforcing ring disposed at the lower end of the reinforcing bar rod. It is characterized by being made of possible metal fittings.

  According to the assembly (2) for preventing the reinforcing bar rod from rising, the bent portion at the other end of the L-shaped bar can be easily and quickly fixed to the reinforcing ring using the fixing bracket. it can. In addition, since it is only necessary to prepare the plurality of rising prevention bars having the same length, which is shorter than the radius of the reinforcing bar rods, the lengths of the reinforcing bar rods are different from each other, as in the conventional cross beam assembly. It can be set as the assembly which does not need to manufacture a reinforcing bar member (according to the difference in the length of a string).

  Moreover, the assembly for preventing the reinforcement of the reinforcing bar (3) according to the present invention is the assembly for preventing the reinforcement of the reinforcing bar (1) or (2), wherein the support member includes a pair of upper and lower annular portions. A connecting portion that connects the pair of upper and lower annular portions by providing a gap that can support one end portion of the rising prevention muscle, and the connecting portions are formed at a plurality of locations on the circumference of the annular portion. It is characterized by that.

  According to the assembly (3) for preventing the reinforcing bar rod from rising, in a state where one end portion of the rising prevention rod is inserted into the gap formed by the pair of upper and lower annular portions and the connecting portion. It can support one end of the rise prevention bar, and does not require the trouble of binding the crossing parts of the reinforcing bar members with a number of wires or the like unlike the conventional cross-girder assembly, and can easily and quickly perform the assembly work. . In addition, since the insertion amount of the one end portion of the rising prevention bar with respect to the gap between the pair of upper and lower annular portions can be adjusted, there is an error in the size of the reinforcing bar rod after assembly, or the diameter size is in a certain range. Even different reinforcing bar rods can be handled with one type (same length) of the above-mentioned anti-raising bars, and can have a certain versatility, thereby improving convenience.

  Further, the assembly for preventing the reinforcement of the reinforcing rods (4) according to the present invention is the assembly for preventing the reinforcement of the reinforcing rods (1) or (2), wherein the support member is a pair of upper and lower plate-like portions. And a connecting portion that connects the pair of upper and lower plate-like portions by providing a gap capable of supporting one end portion of the ascent prevention muscle, and the connecting portion is formed at a central portion of the plate-like portion. Or, it is formed at a plurality of locations on the periphery of the plate-like portion.

  According to the assembly (4) for preventing the reinforcing bar from rising, in a state in which one end of the rising preventing bar is inserted into the gap formed by the pair of upper and lower plate-like parts and the connecting part. It can support one end of the anti-raising bar, and does not require the trouble of binding the crossing parts of the reinforcing bar members with a wire or the like unlike the conventional cross-girder assembly, so that the assembly work can be performed easily and quickly. Can do. Moreover, since the insertion amount of the one end part of the rising prevention bar with respect to the gap between the pair of upper and lower plate-like parts can be adjusted, there is an error in the size of the reinforcing bar rod after assembly, or the diameter size is constant. Reinforcing bar rods that differ in range can be handled by one type (same length) of the above-described anti-raising bars, and can have a certain level of versatility, thereby improving convenience.

  Moreover, the assembly for preventing the reinforcement of the reinforcing rods (5) according to the present invention is the assembly for preventing the reinforcement of the reinforcing rods (1) or (2), wherein the support member is the plurality of the elevation preventing muscles. It is characterized in that the hole through which the hole is inserted is composed of an annular member formed on the side surface with a predetermined interval.

  According to the assembling body (5) for preventing the rise of the reinforcing bar, the one end portion of the rise preventing muscle in a state where the one end portion of the rise preventing muscle is inserted into the insertion hole formed in the side surface of the annular member. Thus, there is no need to bind the intersecting portions of the reinforcing bar members with a number wire or the like unlike the conventional cross-girder assembly, and the assembly work can be performed easily and quickly. In addition, since the insertion amount of the one end portion of the rising prevention bar can be adjusted with respect to the insertion hole of the annular member, there is an error in the size of the reinforcing bar rod after assembly, or the diameter size is constant. Reinforcing bar rods that differ in range can be handled by one type (same length) of the above-described anti-raising bars, and can have a certain level of versatility, thereby improving convenience.

  In addition, the reinforcing bar rod according to the present invention is characterized in that any of the above-described assembling bodies (1) to (5) for preventing the reinforcing bar rod from rising is attached to the lower end portion of the reinforcing bar rod.

  According to the above-mentioned reinforcing bar rod, as in the conventional cross-girder assembly, the above-mentioned assembly for preventing the reinforcing bar rod from rising without performing the binding or welding work on the crossing portion of the reinforcing bar member or the connecting portion with the reinforcing bar rod with the wire. Attached body can be easily and quickly assembled to the lower end of the rebar rod, the assembling work of the rebar rod can be made more efficient, and the rebar rod rises and floats when constructing the pile foundation Can be reliably prevented.

  Moreover, the construction method of the cast-in-place pile according to the present invention is as follows. When the cast-in-place pile is constructed by the all-casing method in which the pile hole is formed while the casing tube is press-fitted into the ground, the reinforcing bar (1) is placed in the pile hole. It includes a step of building, a step of driving concrete into the pile hole, and a step of drawing and collecting the casing tube together with the driving of the concrete.

  According to the above-mentioned cast-in-place pile construction method, the cast-in-place pile can be smoothly constructed by improving the efficiency of the assembling work of the rebar rod, and the rebar rod is shared when constructing the pile foundation. It is possible to reliably prevent ascending and rising.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which showed the state which assembled | attached the reinforcing bar clerk assembly | attachment body for reinforcing bar reinforcement which concerns on embodiment (1) of this invention, (a) is the bottom view of a reinforcing bar casket, (b) is ( It is a bb line end view in a). It is a figure for demonstrating the form of the supporting member which comprises the assembly | attachment body for prevention of a reinforcement of the reinforcing bar according to another embodiment, (a) is a bottom view, (b) is bb in (a). It is sectional drawing. It is a figure for demonstrating the form of the supporting member which comprises the assembly | attachment body for the reinforcement prevention of a reinforcing bar clerk which concerns on another embodiment, (a) is a bottom view, (b) is b- in (a). It is b line sectional drawing. It is the schematic which showed the state which assembled | attached to the reinforcing bar rod the assembly for reinforcement prevention of the reinforcing rod according to the embodiment (2), (a) is a bottom view of the reinforcing bar rod, and (b) is in (a). It is a bb line end view. It is a figure for demonstrating the form of the supporting member which comprises the assembly | attachment body for prevention of a reinforcement of the reinforcing bar according to another embodiment, (a) is a bottom view, (b) is bb in (a). It is line sectional drawing. It is the schematic which showed the state which assembled | attached the reinforcing bar clerk assembly which concerns on embodiment (3) to the reinforcing bar casket, (a) is a bottom view of a reinforcing bar casket, (b) is (a) It is a bb line end view in FIG. It is the figure which showed the rebar rod to which the conventional cross-girder-shaped rebar frame was attached, (a) is a longitudinal cross-sectional view which shows the rebar rod built in the hole, (b) is the bb line cross section in (a) FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a method for constructing an assembly for preventing ascent of a reinforcing bar, a reinforcing bar, and a cast-in-place pile according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a state in which the assembly for preventing the reinforcement of the reinforcing bar 1 according to the embodiment (1) is assembled to the reinforcing bar, (a) is a bottom view of the reinforcing bar, and (b) It is a bb line end view in (a).

  The reinforcing bar 1 is arranged in a manner orthogonal to the inside of the main bars 2 and arranged in a manner orthogonal to the inner side of the main bars 2 and fixed to the main bars 2 at the intersections. A plurality of reinforcing rings (annular strips) 3 (arranged at regular intervals) and a large number of hoops (not shown) wound in a manner substantially perpendicular to the outside of the main bars 2 are configured. Yes. The intersection between the main reinforcement 2 and the reinforcing ring 3 is fixed by a connection fixing fitting (not shown), and the intersection between the main reinforcement 2 and the hoop reinforcement is fixed by a clip fitting, a wire bundle or the like (not shown). The reinforcing ring 3 shown in FIG. 1 is provided at the lowermost end of the reinforcing bar 1.

  Such a rebar rod 1 has a diameter of about 0.6 m to 3 m and a length of about 12 m per rod, and the main rebar 2 has a diameter of about 19 to 51 mm. The optimum one is adopted according to the design conditions such as the size of 1 and the required strength.

  Reinforcement rod assembling prevention assembly (hereinafter referred to as ascending prevention assembling assembly) 10 is, for example, in the construction of cast-in-place pile, for example, in the all casing construction method, when the concrete tube is driven and the casing tube is pulled out and collected, In order to prevent the co-up phenomenon (increase) of the reinforcing bar rod built in the pile hole, it is assembled to the lower end portion of the reinforcing bar rod 1.

  The assembling body 10 for ascent prevention includes a plurality of anti-raising bars 11 arranged radially from the lower end central part of the reinforcing bar 1 and one end of the plural anti-raising bars 11 at the lower end central part of the reinforcing bar 1. And a plurality of fixing brackets 30 for fixing the other end portions of the plurality of rising prevention bars 11 to the reinforcing bar rods.

  The rise prevention bar 11 is configured by an L-shaped bar-like bar (screw bar, etc.) having a bent portion 12 having a length shorter than the radius of the reinforcing bar 1 and the other end bent at a right angle. The diameter of the rise prevention bar 11 is not particularly limited, but a diameter of about 19 mm to 25 mm is preferably employed from the viewpoint of assembling workability, strength, and the effect of preventing the rise of the reinforcing bar 1. The length of the ascending prevention bar 11 is shorter than the radius of the reinforcing bar 1 to be applied, and when the one end part is inserted into the gap 24 of the support member 20, the length of the insertion part can be ensured to be 50 mm or more. Is set to

  Moreover, although the number of the raising prevention rod 11 used for one reinforcing bar rod can be suitably selected according to the size (diameter and length) of the reinforcing rod 1, from the viewpoint of securing the raising prevention effect of the reinforcing rod 1. It is preferable to use 8 or more, more preferably 16 or more. Moreover, it is preferable to arrange | position these raising prevention bars 11 on a circumference at equal intervals so that resistance may be applied equally to the bottom face of a reinforcing bar when the casing tube is pulled out. The rise prevention muscle 11 is fixed to the reinforcing ring 3 using the fixing bracket 30 in a state where the bent portion 12 is in contact with the outer peripheral surface of the reinforcing ring 3.

  The support member 20 includes a pair of upper and lower annular portions 21 and 22 and a connecting portion 23 that connects the pair of upper and lower annular portions 21 and 22 by providing a gap 24 that can support one end portion of the ascent prevention muscle 11. The portions 23 are formed at four locations (approximately 90 ° intervals) on the circumference of the annular portions 21 and 22.

  The pair of upper and lower annular portions 21 and 22 are respectively composed of strip-shaped steel plates (longitudinal widths of 50 mm to 75 mm and thicknesses of about 4.5 mm to 12 mm) whose longitudinal sections are long in the longitudinal direction. The connecting portion 23 is formed at four locations on the circumference of the annular portions 21 and 22, joined to the annular portions 21 and 22 by welding or the like, and is configured by a steel material or the like having substantially the same thickness as the annular portions 21 and 22.

  The diameters of the annular portions 21 and 22 are set according to the diameter of the reinforcing bar 1. For example, when the diameter of the reinforcing bar 1 is 1000 mm to 1500 mm, the annular portions 21 and 22 having a diameter of about 400 mm to 600 mm are applied. When the diameter of the reinforcing bar 1 is 1600 mm to 2000 mm, the diameter is about 500 mm to 800 mm. In the case where the diameter of the reinforcing bar 1 is 2500 mm to 3000 mm, the annular parts 21 and 22 having a diameter of 1200 mm to 1500 mm can be applied. The diameters of the annular portions 21 and 22 are preferably set to be smaller than the radius of the reinforcing bar 1.

  The gap between the pair of upper and lower annular portions 21 and 22 formed by the connecting portion 23 is not particularly limited as long as it is large enough to support one end portion of the ascent prevention muscle 11 (a width larger than the diameter of the ascent prevention muscle 11). However, it is preferable to set the same size as the diameter of the ascent prevention muscle 11 or a slightly larger size from the viewpoint of preventing the ascent of the ascent prevention muscle 11 inserted in the gap.

  Moreover, the formation location of the connection part 23 is not limited to the above-mentioned 4 places, It can also increase according to the magnitude | size (diameter) of a pair of upper and lower annular parts 21 and 22, The lateral width and the installation position are set to a width and position that do not hinder insertion of the ascent prevention muscle 11 into the gap. Moreover, although the connection part 23 is comprised with a pair of connection piece which can insert the one end part of the raising prevention muscle 11, it is not limited to this form.

  The fixing metal fitting 30 is configured to include a metal fitting body 34 having a bent portion 31 in which a plate-like body is folded back in a U shape, a left piece 32, and a right piece 33, and the U-shaped bent portion 31 is an ascending prevention muscle. 11 insertion portions. An insertion groove 35 for inserting a reinforcing ring is formed from one side edge of each of the left piece 32 and the right piece 33, and an insertion hole 36 for inserting a fixing bolt is formed at the top of the bent portion 31. A nut 37 communicating with the insertion hole 36 is fixed to the nut 37, and a fixing bolt 38 is rotatably attached to the nut 37 through the insertion hole 36.

  Next, an example of a method for assembling the assembling body 10 for preventing elevation according to the embodiment (1) to the reinforcing bar 1 will be described. After assembling the reinforcing bar 1, the ascending prevention bar 11 is fixed to the reinforcing ring 3 at the bottom side end of the reinforcing bar 1 in a state of being laid down by the fixing bracket 30.

  First, the ascending prevention bar 11 is fixed to the reinforcing ring 3 below the center part of the reinforcing bar 1 with the fixing bracket 30. The procedure of fixing the ascent prevention bar 11 to the reinforcing ring 3 with the fixing bracket 30 is performed by inserting the bent portion 12 of the ascent prevention bar 11 into the bent portion 31 of the fixing bracket 30 and the bent portion 12 of the rising prevention bar 11. Is inserted into the reinforcing ring 3 while the abutment is in contact with a predetermined position outside the reinforcing ring 3. Thereafter, using a power tool (impact wrench or the like), the fixing bolt 38 attached to the fixing bracket 30 is rotated so that the tip of the bolt 38 is pressed against the ascent prevention muscle 11, and the reinforcing ring 3 The crossing with the ascent prevention muscle 11 is tightened to fix the ascent prevention muscle 11 to the reinforcing ring 3.

  When the attachment of the rise prevention bars 11 to the reinforcing ring 3 below the central portion of the reinforcing bar 1 is finished, the support member 20 is then attached to the rise prevention bars 11. While inserting one end portion of the ascending prevention muscle 11 fixed below the center portion of the reinforcing ring 3 into the lower gap 24 of the support member 20 in a state where the annular portions 21 and 22 are vertically raised, The support member 20 is dropped.

  One end portion of the rising prevention muscle 11 fixed in the substantially horizontal direction is inserted in the vicinity of the center of the reinforcing ring 3 into the left and right connecting portions 23 positioned in the substantially horizontal direction of the support member 20, and the rising prevention muscle 11 is folded. The curved portion 12 and the reinforcing ring 3 are fixed by a fixing metal fitting 30. In addition, in order to make attachment work easy, you may hold | maintain the support member 20 in the state suspended with the lifting tools, such as the chain hung on the reinforcement ring 3. FIG. Thereby, the support member 20 can be arrange | positioned near the center part of the reinforcing bar 1. In addition, in order to improve the stability of the attachment state of the support member 20, you may fix a part of raising prevention | strengthening reinforcement | strength 11 and the annular parts 21 and 22 of the support member 20 with metal fittings.

  Next, the rise prevention bar 11 is fixed to the reinforcing ring 3 above the center portion of the reinforcing bar 1 with the fixing bracket 30. First, one end portion of the rise preventing muscle 11 is inserted into the gap 24 of the support member 20, and the bent portion 31 of the fixing metal fitting 30 is inserted into the bent portion 12 of the rise preventing muscle 11. The insertion groove 35 of the fixing metal fitting 30 is fitted into the reinforcing ring 3 while bringing 12 into contact with a predetermined position outside the reinforcing ring 3. Thereafter, using a power tool (impact wrench or the like), the fixing bolt 38 attached to the fixing bracket 30 is rotated so that the tip of the bolt 38 is pressed against the ascent prevention muscle 11, and the reinforcing ring 3 By tightening the intersection with the rise prevention bar 11 and fixing the rise prevention bar 11 to the reinforcement ring 3, the installation of the rise prevention bar to the reinforcement ring 3 above the central part of the reinforcing bar 1 is finished, and the assembling work Finish. Even if the support member 20 is displaced from the central portion of the reinforcing bar 1, the position of the supporting member 20 can be corrected in a state where the reinforcing bar 1 is erected.

  In addition, the method of assembling the ascent prevention assembly 10 to the reinforcing bar 1 is not limited to the above method, and the order and method of attaching the ascent prevention bars 11 and the support member 20 can be changed as appropriate. Alternatively, the reinforcing bar 1 may be attached in a erected state.

  Next, the construction method by the all casing construction method among the construction methods of the cast-in-place concrete pile using the reinforcing bar 1 to which the assembling body 10 for preventing the elevation according to the embodiment is assembled will be described. It is enforced by the same method as the conventional all-casing method except that the reinforcing bar 1 to which the assembling body 10 for ascent prevention is assembled is used.

  That is, an excavator (not shown) is installed horizontally on the ground, and the center of the casing tube (not shown) and the pile core are aligned. Next, the casing tube is swung (rotated) over the entire length of excavation, and the sand and sand in the casing tube is excavated with a hammer magnet (not shown) while being pushed in. After confirming the support layer, the excavation is performed. After completion of the roughening by the hammaglab, a sedimentation bucket (not shown) is put into the hole bottom, and after waiting for sedimentation, it is pulled up together with the slime.

  Next, the reinforcing bar 1 assembled with the assembling body 10 for preventing ascent is built vertically in the center of the hole. Thereafter, a tremy tube (not shown) is inserted into the hole, concrete is poured from the tremy tube, and the concrete is driven into the hole. Pulling out the casing tube and the tremy tube while putting in concrete, and recovering it. After that, the back dug portion is backfilled to finish the work.

  According to the assembling assembly 10 for preventing elevation according to the embodiment (1), the support member 20 is disposed at the center of the lower end of the reinforcing bar 1, and a plurality of radial members are equally disposed radially from the center of the lower end of the reinforcing bar 1. One end portion of the anti-raising bar 11 is supported by the gap 24 of the support member 20, and the bent portions 12 of the plural anti-raising bars 11 are fixed to the reinforcing ring 3 of the reinforcing bar 1 with the fixing bracket 30. The crossing part of the reinforcing bar member and the connecting part with the reinforcing bar rod can be easily and quickly assembled to the lower end portion of the reinforcing bar rod 1 without performing the wire-line bundling or welding as in the case of the cross-girder assembly.

  In addition, since it is only necessary to prepare a plurality of rising prevention bars 11 having the same length and shape that are shorter than the radius of the reinforcing bar 1, different lengths are used for one reinforcing bar like a conventional cross-girder assembly. It can be set as the assembly which does not need to manufacture the reinforcing bar member (it respond | corresponds to the difference in the length of a string).

  Moreover, since the insertion amount of the one end part of the ascent prevention bar | burr 11 with respect to the clearance gap 24 of the supporting member 20 can be adjusted, when the error has arisen in the size of the reinforcing bar 1 after an assembly, or a diameter size differs in a fixed range. Even a reinforcing bar rod can be handled with one type (same length and shape) of the anti-raising bar 11 and can have a certain versatility, thereby improving convenience.

  Moreover, according to the reinforcing bar 1 assembled with the assembling assembly 10 for preventing the rising according to the above embodiment (1), it is connected to the crossing portion of the reinforcing bar member or the reinforcing bar bar like the conventional cross-girder assembly. The assembling body 10 for preventing ascending can be easily and quickly assembled to the lower end portion of the reinforcing bar 1 without tying the parts together with a wire or welding work, and improving the efficiency of the assembling work of the reinforcing bar 1 In addition, it is possible to reliably prevent the reinforcement of the reinforcing bar 1 during the construction of the pile foundation.

  Moreover, according to the construction method of the cast-in-place pile using the reinforcing bar 1 in which the assembling body 10 for preventing the rising according to the embodiment (1) is assembled, the efficiency of the assembling work of the reinforcing bar 1 is improved. Thus, the cast-in-place pile can be smoothly constructed, and the joint uplift and lift of the reinforcing bar 1 can be reliably prevented when constructing the pile foundation.

  The form of the support member 20 is not limited to the above embodiment. FIG. 2 is a view for explaining the form of a support member constituting an assembly for preventing rise according to another embodiment, (a) is a bottom view, and (b) is b- in (a). It is b line sectional drawing.

  The pair of upper and lower annular portions 21 and 22 of the support member 20 are each composed of a strip-shaped steel plate whose longitudinal section is long in the longitudinal direction, and has a structure that is not easily bent (not easily deformed) even when a force is applied in the drawing direction of the casing tube. However, as for support member 20A which constitutes an assembly for a rise prevention concerning another embodiment, a pair of upper and lower annular parts 21A and 22A are each constituted by a strip steel plate with a long vertical section in the horizontal direction. . By using the supporting member 20A in such a form, the area of the plane is increased, so that the resistance to the upward direction can be increased with respect to the pulling out of the casing tube, and the effect of preventing the rising phenomenon such as the co-up of the reinforcing bar 1 is prevented. Can be increased.

  FIGS. 3A and 3B are views for explaining the form of the support member that constitutes the assembly for preventing ascending according to another embodiment. FIG. 3A is a bottom view, and FIG. It is a bb sectional view taken on the line.

  In a support member 20B according to still another embodiment shown in FIG. 3, a pair of upper and lower annular portions 21B and 22B are respectively configured by rod-like streaks having a substantially circular longitudinal section. Even when the support member 20B is configured as described above, it is possible to obtain substantially the same effect as that of the assembly 10 for preventing rise according to the embodiment (1).

  FIG. 4 is a schematic view showing a state where the assembly for preventing elevation according to the embodiment (2) is assembled to a reinforcing bar rod, (a) is a bottom view of the reinforcing rod rod, and (b) is (a). FIG.

  The rise preventing assembly 10A according to the embodiment (2) is different from the rise preventing assembly 10 according to the embodiment (1) in that the structure of the support member 20C and the structure of the fixing bracket 40 are the same. It is in. Constituent parts having the same functions as those of the ascent prevention assembly 10 according to the embodiment (1) are assigned the same reference numerals, and descriptions thereof are omitted here.

  The support member 20 </ b> C is a connection that connects the pair of upper and lower disk parts 25, 26 by providing a pair of upper and lower disk parts (plate-like parts) 25, 26 and a gap 24 that can support one end of the ascent prevention muscle 11. 23A, and the connecting portion 23A is formed at one central portion of the disk portions 25 and 26.

  The pair of upper and lower disk parts 25 and 26 are each composed of a circular steel plate (thickness of about 6 mm to 12 mm). The connecting portion 23A is joined to the central portions of the disk portions 25 and 26 by welding or the like, and is made of a columnar or cylindrical steel material.

  The gap 24 between the pair of upper and lower disk parts 25, 26 formed by the height of the connecting part 23A has a size capable of supporting one end of the ascent prevention muscle 11 (a width larger than the diameter of the ascent prevention muscle 11). Although there is no particular limitation as long as it is present, it is preferable to set the same size as the diameter of the ascent prevention muscle 11 or a slightly larger size from the viewpoint of preventing wobbling of the ascent prevention muscle 11 inserted into the gap 24.

  The diameters of the pair of upper and lower disk parts 25 and 26 can be set according to the diameter of the reinforcing bar 1. For example, when the diameter of the reinforcing bar 1 is 1000 mm to 1500 mm, the disk portions 25 and 26 having a diameter of about 400 mm to 600 mm are applied, and when the diameter of the reinforcing bar 1 is 1600 mm to 2000 mm, the diameter is about 500 mm to The disc portions 25 and 26 of 800 mm are applied, and when the diameter of the reinforcing bar 1 is 2500 mm to 3000 mm, the disc portions 25 and 26 having a diameter of 1200 mm to 1500 mm can be applied. The diameters of the disc parts 25 and 26 are set to be smaller than the radius of the reinforcing bar 1.

  The length of the ascent prevention bar 11 is shorter than the radius of the reinforcing bar 1 to be applied, and when the one end part is inserted into the gap 24 between the disk parts 25 and 26, the length of the insertion part is ensured to be 50 mm or more. The length is set as possible. The ascent prevention muscle 11 is fixed to the reinforcing ring 3 by the fixing bracket 40 in a state where the bent portion 12 is in contact with the outer surface of the reinforcing ring 3.

  The fixing bracket 40 is positioned with the reinforcing ring 3 sandwiched in the vertical direction, and includes a gripping portion 42 having a notch portion 41 for inserting the bent portion 12 of the ascent prevention muscle 11, and two upper and lower gripping portions 42. And a screw hole plate portion 43 to be connected. A screw hole 44 for screwing a bolt 45 that tightens the intersection of the ascent prevention bar 11 and the reinforcing ring 3 is formed at a substantially central portion of the screw hole plate portion 43.

  Next, an example of a method for assembling the assembling body 10A for preventing elevation according to the embodiment (2) to the reinforcing bar 1 will be described. After assembling the reinforcing bar 1, the ascending prevention bar 11 is fixed to the reinforcing ring 3 at the bottom side end portion of the reinforcing bar 1 in a state of being laid down by using the fixing bracket 40.

  First, the ascending prevention bar 11 is fixed to the reinforcing ring 3 below the center portion of the reinforcing bar 1 with the fixing bracket 40. The procedure of fixing the ascent prevention bar 11 to the reinforcing ring 3 with the fixing bracket 40 is made such that the bent portion 12 of the ascent prevention bar 11 is brought into contact with a predetermined position on the outside of the reinforcing ring 3 so as to intersect with each other. The grip portion 42 is positioned at a position where the bent portion 12 of the ascending prevention muscle 11 is gripped with the reinforcing ring 3 sandwiched in the vertical direction. At this time, the screw hole plate portion 43 of the fixing metal fitting 40 is set so as to be positioned inside the reinforcing ring 3. Next, a bolt 45 is attached to the screw hole 44 of the screw hole plate portion 43, and the bolt 45 is rotated with an electric tool or the like to tighten the intersection of the reinforcing ring 3 and the bent portion 12 of the ascent prevention muscle 11. As a result, the rise prevention muscle 11 is fixed to the reinforcing ring 3.

  When the attachment of the rise prevention bars 11 to the reinforcing ring 3 below the center portion of the reinforcing bar 1 is finished, the support member 20 </ b> C is then attached to the rise prevention bars 11. While inserting one end portion of the ascending prevention muscle 11 fixed below the central portion of the reinforcing ring 3 into the lower gap 24 of the support member 20C in a state where the plate-like portions 25 and 26 are vertically raised. Then, the support member 20C is dropped, and the connecting portion 23A of the support member 20C is applied to the tip of one end portion of the rise prevention muscle 11 so that the support member 20C is engaged with the rise prevention muscle 11. Thereby, 20C of support members can be arrange | positioned in the central part vicinity of the reinforcing bar rod 1. FIG.

  Next, the ascending prevention bar 11 is fixed to the reinforcing ring 3 above the center portion of the reinforcing bar 1 with the fixing bracket 40. First, one end portion of the ascent prevention muscle 11 is inserted into the gap 24 of the support member 20 </ b> C, and the bent portion 12 of the ascent prevention muscle 11 is brought into contact with a predetermined position outside the reinforcing ring 3 so as to intersect. Next, the upper and lower gripping portions 42 of the fixing bracket 40 are positioned so as to grip the bent portion 12 of the ascent prevention muscle 11 with the reinforcing ring 3 sandwiched in the vertical direction. At this time, the screw hole plate portion 43 of the fixing metal fitting 40 is set so as to be positioned inside the reinforcing ring 3. Next, a bolt 45 is attached to the screw hole 44 of the screw hole plate portion 43, and the bolt 45 is rotated with an electric tool or the like to tighten the intersection of the reinforcing ring 3 and the bent portion 12 of the ascent prevention muscle 11. Thus, the rise prevention bar 11 is fixed to the reinforcing ring 3, the attachment of the rise prevention bar 11 to the reinforcement ring 3 above the central portion of the reinforcing bar 1 is finished, and the assembling work is finished. Even if the support member 20C is displaced from the central portion of the reinforcing bar rod 1, the position of the supporting member 20C can be corrected in a state where the reinforcing bar rod 1 is erected.

  Further, the method of assembling the ascent prevention assembly 10A to the reinforcing bar 1 is not limited to the above method, and the assembling order and the assembling method of the ascent prevention bar 11 and the support member 20C can be changed as appropriate. Alternatively, the reinforcing bar 1 may be attached in a erected state.

  Moreover, the construction method of the cast-in-place concrete pile using the reinforcing bar 1 with which the assembling body 10A for raising prevention according to the embodiment is assembled uses the reinforcing bar 1 with the assembling body 10A for preventing rising. Except for, the method is the same as the conventional enforcement method, so the description thereof will be omitted here.

  According to the assembly 10A for preventing rise according to the above embodiment (2), the same effect as that of the assembly 10 for preventing rise according to the above described embodiment (1) can be obtained and supported. Since the member 20C is composed of a pair of upper and lower disk portions 25, 26, the area of the plane can be increased, the resistance to the upward direction against the withdrawal of the casing tube can be increased, and the reinforcing bar 1 It is possible to further enhance the effect of preventing the rising phenomenon such as co-up. In addition, in the assembling body 10A for preventing elevation according to the above embodiment, the fixing bracket 40 is used, but the fixing bracket 30 can also be used.

  In addition, according to the reinforcing bar 1 with the assembling assembly 10 </ b> A for ascending prevention according to the above embodiment (2), the assembling body 10 </ b> A for preventing rising is easily and quickly assembled to the lower end portion of the reinforcing bar 1. Therefore, it is possible to improve the efficiency of the assembling work of the reinforcing bar 1 and to surely prevent the reinforcing bar 1 from rising or rising when constructing the pile foundation.

  Moreover, according to the construction method of the cast-in-place pile using the reinforcing bar 1 to which the assembling body 10A for preventing rising according to the embodiment (2) is assembled, the efficiency of the assembling work of the reinforcing bar 1 is improved. Thus, the cast-in-place pile can be smoothly constructed, and the joint uplift and lift of the reinforcing bar 1 can be reliably prevented when constructing the pile foundation.

  Note that the support member 20C is not limited to the above-described form. FIGS. 5A and 5B are views for explaining the form of a support member constituting an assembly for preventing rise according to another embodiment, wherein FIG. 5A is a bottom view, and FIG. 5B is b- in FIG. It is b line sectional drawing.

  In the above-described support member 20C, the connecting portion 23A is formed at the center of the disk portions 25 and 26, but the place where the connecting portion is formed is not limited to this position, and the support according to another embodiment is provided. As shown in FIG. 5, the member 20 </ b> D has a configuration in which connecting portions 23 </ b> B are formed at a plurality of locations on the circumference of the disk portions 25 and 26, at four locations at intervals of 90 degrees. The number of connecting portions 23B can be increased according to the size (diameter) of a pair of upper and lower disk portions, and the width and installation position of the connecting portions 23B can be inserted into the gap 24 of the ascent prevention muscle 11. It is set to a width and position that do not interfere with the operation. In addition, although the connection part 23B is comprised with a pair of connection piece which can insert the one end part of the raising prevention muscle 11, it is not limited to this form.

  FIG. 6 is a schematic view showing a state in which the assembly for preventing the reinforcement of the reinforcing rod according to the embodiment (3) is assembled to the reinforcing rod, (a) is a bottom view of the reinforcing rod, and (b) It is a bb line end view in (a).

  A point of difference between the assembling assembly 10 </ b> B for ascending prevention according to the embodiment (3) and the assembling body 10 for ascent preventing according to the embodiment (1) is in the structure of the support member 20 </ b> E. Constituent parts having the same functions as those of the ascent prevention assembly 10 according to the embodiment (1) are assigned the same reference numerals, and descriptions thereof are omitted here.

  The support member 20E is a ring member 28 in which support holes 27 for inserting and supporting one end portions of the plurality of anti-raising bars 11 are provided on the side surfaces with a predetermined interval (an interval corresponding to the number of the anti-raising bars 11 installed). It consists of The ring member 28 is made of a strip-shaped steel plate (longitudinal width 75 mm to 100 mm, thickness 6 mm to 12 mm) whose longitudinal section is long in the longitudinal direction.

  The size of the support hole 27 is not particularly limited as long as it is a size capable of supporting one end portion of the ascent prevention muscle 11 (a hole size larger than the cross section of the ascent prevention muscle 11). From the viewpoint of preventing this, it is preferable to set the hole size to be the same as the diameter of the ascending prevention muscle 11 or a slightly larger hole size.

  The diameter of the ring member 28 can be set according to the diameter of the reinforcing bar 1. For example, when the diameter of the reinforcing bar 1 is 1000 mm to 1500 mm, the ring member 28 having a diameter of about 400 mm to 600 mm is applied. When the diameter of the reinforcing bar 1 is 1600 mm to 2000 mm, the ring having a diameter of about 500 mm to 800 mm When the member 28 is applied and the diameter of the reinforcing bar 1 is 2500 mm to 3000 mm, the ring member 28 having a diameter of 1200 mm to 1500 mm can be applied. The diameter of the ring member 28 is preferably set to be smaller than the radius of the reinforcing bar 1.

  The length of the ascent prevention bar 11 is shorter than the radius of the reinforcing bar 1 to be applied, and when the one end part is inserted into the support hole 27 of the ring member 28, the length of the insertion part can be ensured to be 50 mm or more. Is set. The rise prevention muscle 11 is fixed to the reinforcing ring 3 by the fixing bracket 30 in a state where the bent portion 12 is in contact with the outer surface of the reinforcing ring 3.

  Next, an example of a method for assembling the ascent prevention assembly 10B according to the embodiment (3) to the reinforcing bar 1 will be described. After assembling the reinforcing bar 1, the support member 20 </ b> E is hung near the central part of the reinforcing bar 1 by using a chain or other hoisting tool on the reinforcing ring 3 at the bottom side end of the reinforcing bar 1 in the lying state. The state is set (the ring member 28 is raised vertically).

  Next, one end of the ascending prevention muscle 11 is inserted into the support hole 27 of the support member 20 </ b> E, and the bent portion 12 at the other end is fixed to the reinforcing ring 3. There is no problem even if the anti-raising bar 11 is attached from any position on the circumference of the support member 20E, but it is preferably attached from the left and right directions in order to suppress the wobbling of the support member 20E.

  Insert the bent portion 12 of the ascending prevention muscle 11 into the bent portion 31 of the fixing bracket 30, and bring the bent portion 12 of the ascent preventing muscle 11 into contact with a predetermined position outside the reinforcing ring 3. The insertion groove 35 of the fixing bracket 30 is fitted. Thereafter, using an electric tool (impact wrench or the like), the bolt 38 attached to the fixing bracket 30 is rotated, the tip of the bolt 38 is pressed against the ascent prevention muscle 11, and the reinforcing ring 3 and the ascent prevention muscle are pressed. 11 is tightened, the ascending prevention muscle 11 is sequentially fixed to the entire circumference of the reinforcing ring 3, and the assembling work is completed. Even if the support member 20E is displaced from the central portion of the reinforcing bar rod 1, the position of the supporting member 20E can be corrected in a state where the reinforcing bar rod 1 is erected.

  Further, the method of assembling the ascent prevention assembly 10B to the reinforcing bar 1 is not limited to the above method, and the assembling order and the assembling method of the ascent prevention bar 11 and the support member 20E can be changed as appropriate. Alternatively, the reinforcing bar 1 may be attached in a erected state.

  Moreover, the construction method of the cast-in-place concrete pile using the reinforcing bar 1 with which the assembly 10B for prevention of raising which concerns on embodiment (3) was assembled | attached is the reinforcing bar 1 with which the assembly 10B for prevention of raising was assembled. Since it is the same method as the conventional enforcement method, except that the point is used, the description thereof will be omitted here.

  The rise preventing assembly 10B according to the above embodiment (3) can provide the same effects as those of the above rise preventing assembly 10 according to the above embodiment (1), and support. Since the member 20E is composed of the ring member 28 in which a plurality of support holes 27 are formed, one end of the ascent prevention muscle 11 can be inserted into the support hole 27 to be supported. Mounting stability to 20E can be improved. In addition, in the assembling body 10B for preventing ascending according to the above embodiment (3), the fixing bracket 30 is used, but the fixing bracket 40 can also be used.

  Moreover, according to the reinforcing bar 1 with the assembling assembly 10 </ b> B for ascent prevention according to the above embodiment (3), the assembling body 10 </ b> B for ascending prevention is easily and quickly assembled to the lower end portion of the reinforcing bar 1. Therefore, it is possible to improve the efficiency of the assembling work of the reinforcing bar 1 and to surely prevent the reinforcing bar 1 from rising or rising when constructing the pile foundation.

  Moreover, according to the construction method of the cast-in-place pile using the reinforcing bar 1 to which the assembling body 10B for preventing rising according to the embodiment (3) is assembled, the efficiency of the assembling work of the reinforcing bar 1 is improved. Thus, the cast-in-place pile can be smoothly constructed, and the joint uplift and lift of the reinforcing bar 1 can be reliably prevented when constructing the pile foundation.

  The fixing brackets constituting the assembly for preventing elevation according to the present invention are not limited to the above-described fixing brackets 30 and 40, and various types capable of fixing the intersecting portion of the reinforcing ring 3 and the elevation preventing muscles 11 are possible. However, it is preferable to have a structure that anyone can easily attach with a power tool or the like.

  Further, the form of the ascent prevention bar 11 is not limited to the L-shaped bar bar, and various forms that can be attached to the reinforcing ring 3 with the fixing brackets 30 and 40 can be adopted. Further, the planar shape of the support members 20, 20A, 20B, 20C, 20D, and 20E is not limited to a circle.

  In addition, the reinforcing bar with the assembly for preventing rising according to the present invention can be applied to various cast-in-place pile construction methods other than the all-casing construction method, and once the concrete placement in the pile hole is interrupted When the casing tube is pulled out, it is possible to prevent the floating phenomenon that the reinforcing bar rod also rises together.

DESCRIPTION OF SYMBOLS 1 Reinforcement rod 2 Main reinforcement 3 Reinforcement ring 10, 10A, 10B Assembly for raising prevention 11 Lift prevention muscle 20, 20A, 20B, 20C, 20D, 20E Support member 21, 21A, 21B Annular part 22, 22A, 22B Annular part 23, 23A, 23B Connecting portion 24 Clearance 25, 25A Disc portion 26, 26A Disc portion 27 Support hole 28 Ring member 30, 40 Fixing bracket

Claims (7)

In order to prevent the rise of the reinforcing rods built in the pile hole during the construction of the cast-in-place pile, an assembly for preventing the reinforcing rods from being assembled to the lower end of the reinforcing rods,
A plurality of anti-raising bars arranged radially from the lower end central part of the reinforcing bar,
A support member that supports one end of the plurality of anti-raising bars at the lower center of the reinforcing bar,
An assembly for preventing ascent of reinforcing bars comprising a fixing bracket for fixing the other ends of the plurality of ascent preventing bars to the reinforcing bar. The plurality of anti-raising bars are configured with L-shaped bar-shaped bars having a length shorter than the radius of the reinforcing bar and the other end portion is bent.
2. The anti-raising of the reinforcing bar rod according to claim 1, wherein the fixing bracket is constituted by a metal fitting capable of fixing the anti-raising bar to a reinforcing ring disposed at a lower end portion of the reinforcing bar rod. Assembly. The support member includes a pair of upper and lower annular portions and a connecting portion that connects the pair of upper and lower annular portions by providing a gap capable of supporting one end of the rising prevention muscle,
The assembly for preventing ascent of reinforcing bars according to claim 1 or 2, wherein the connecting portions are formed at a plurality of locations on the circumference of the annular portion. The support member includes a pair of upper and lower plate-like portions, and a connecting portion that connects the pair of upper and lower plate-like portions by providing a gap capable of supporting one end of the rising prevention muscle,
The reinforcing bar according to claim 1 or 2, wherein the connecting portion is formed at a central portion of the plate-like portion or at a plurality of locations on the periphery of the plate-like portion. Assembly for prevention of rising.   3. The reinforcing bar rod according to claim 1, wherein the support member is configured by an annular member in which a hole through which the plurality of rise prevention bars are inserted is formed at a predetermined interval on a side surface. Assembly for preventing rise.   Reinforcing bar scissors according to any one of claims 1 to 5, wherein the reinforcing bar scissors assembling prevention assembly is assembled to the lower end of the reinforcing bar scissors. When constructing cast-in-place piles with an all-casing method that forms pile holes while pressing the casing tube into the ground,
Building the reinforcing bar rod according to claim 6 in the pile hole;
Driving concrete into the pile hole;
And a step of drawing and collecting the casing tube together with the concrete driving.

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