JP2010106630A - Reinforcement arrangement structure at corner part in hollow tower-like structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components necessary for anchoring a shear reinforcement in a hollow tower-like concrete structure such as a bridge pier or the like so as to reduce construction cost. <P>SOLUTION: Ends of the inner shear reinforcement 21 which are embedded in the inner periphery of the hollow tower-like structure 1 and extended from the inner periphery to the outer periphery at the corner 1A of the hollow tower-like structure 1 are positioned at the inner side from the outer shear reinforcement 11 embedded in the outer periphery of the hollow tower-like structure 1, and provided with anchoring means 21b, 24a to concrete 40. Thus, a joint fitting such as a short reinforcement or the like is required for anchoring the end of the inner shear reinforcement 21 to the outer shear reinforcement 11 while a joint for connecting the end of the inner shear reinforcement 21 to the joint fitting is not needed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bar arrangement structure at a corner in a hollow tower structure such as a concrete pier.

  A typical conventional technique of a bar arrangement structure at a corner of a hollow pier made of steel reinforced concrete (SRC) is disclosed in Patent Document 1 and Patent Document 2 below. 15 is a perspective view showing a construction process of a conventional hollow pier having a structure similar to that disclosed in these patent documents, and FIG. 16 is a horizontal view showing a bar arrangement structure of a corner portion in the hollow pier of FIG. Sectional drawing and FIGS. 17-19 are horizontal sectional views which show the construction procedure of the conventional hollow pier.

  As shown in FIG. 15, conventionally, a hollow SRC pier 100 is provided with precast concrete molds 101, 102 in which shear reinforcement bars are embedded on the outer periphery and inner periphery, and between these molds 101, 102. The reinforcement unit 103 is erected and arranged at predetermined intervals, and cast-in-place concrete 104 is placed. The reinforcing material unit 103 is called a spiral column, and has a steel frame 103a such as H-shaped steel, a plurality of deformed reinforcing bars 103b arranged in parallel around the steel frame 103a, and a small diameter wound around the deformed reinforcing bars 103b in a spiral shape. The PC steel rod 103c in the reinforcing material unit 103 has both functions of preventing buckling of the steel frame 103a and the deformed reinforcing bar 103b and functioning as an intermediate reinforcing bar for the pier 100 as a whole. .

  As shown in FIG. 16, in the corner portion of the SRC pier 100, the outer shear reinforcement reinforcement 101a in the outer precast concrete formwork 101 is fixed to the inner shear reinforcement reinforcement 102a embedded in the inner precast concrete formwork 102. For this purpose, a short reinforcing bar 101c having a fixing tool 101b having a mechanical coupling structure is incorporated, and the inner precast concrete formwork 102 (102A, 102B) which is abutted at right angles is embedded in one formwork 102A. The inner shear reinforcing bar 102a has an end projecting from the edge of the mold 102A, joined to the short reinforcing bar 101c via a joint 101d, and connected to the other end via a joint 102b. 102c is joined to another short reinforcing bar 101c via a joint 101d.

  First, as shown in FIG. 17, the SRC pier 100 is constructed by installing an outer precast concrete form 101, and a fixed portion of the outer precast concrete form 101 on the outer shear reinforcement bar 101a via a fixing tool 101b. Then, the short reinforcing bars 101c are attached, and a plurality of reinforcing material units (spiral columns) 103 are installed at predetermined intervals along the inner periphery of the precast concrete mold 101.

  Next, as shown in FIG. 18, an inner precast concrete formwork 102 is installed, and from the end of one precast concrete formwork 102A of the inner precast concrete formwork 102 which is abutted at right angles to each other, an outer precast concrete formwork 102 is placed. An end portion of the inner shear reinforcement bar 102a extending toward the vicinity of the corner of the concrete formwork 101 is attached to a short reinforcing bar 101c attached to the outer shear reinforcement bar 101a of the outer precast concrete formwork 101 at a position facing the end part. It is fixed by joining via the joint 101d.

  Next, as shown in FIG. 19, the other end of the inner shear reinforcement bar 102a exposed at the end of the other inner precast concrete mold 102B among the inner precast concrete molds 102 that are abutted at right angles at the corners. Further, an extension reinforcing bar 102c that intersects the end of the inner shear reinforcing bar 102a of one precast concrete formwork 102A is joined via a joint 102b, and this extension reinforcing bar 102c is joined as shown in FIG. The inner shear reinforcing bar 102a is fixed by joining to another short reinforcing bar 101c attached to the outer shear reinforcing bar 101a of the outer precast concrete mold 101 via the joint 101d.

  Here, the inner precast concrete formwork 102 (102A, 102B) can only be built in the vertical direction because it is installed by a crane. Therefore, when both ends of the inner shear reinforcement bars 102a embedded in the inner precast concrete formwork 102 are extended from the end edges of the inner precast concrete formwork 102, the inner precast concrete formwork 102 in the vertical direction by the crane is used. In the erection process, the ends of the inner shear reinforcement bars 102a intersect and interfere with each other in the corner of the pier 100, so that the erection cannot be performed. The ends of the inner shear reinforcement bars 102a protruding from at least one of the inner precast concrete molds 102A and 102B to be abutted are shortened so as not to interfere with the inner shear reinforcement bars 102a protruding from the other side. After the concrete formwork 102A, 102B is built, An extended rebar 102c is joined to the short end of the reinforcing bar 102a via a joint 102b, and the joint 101d is connected to a short reinforcing bar 101c in which the extended reinforcing bar 102c is attached to the outer shear reinforcing bar 101a of the outer precast concrete formwork 101. Are joined through.

  However, such a bar arrangement requires three joints per section and an extension reinforcing bar 102c per corner, and usually the inner shear reinforcement 102a of the inner precast concrete formwork 102 and the outer precast concrete. Since the outer shear reinforcement bars 101a of the mold 101 are provided at intervals of 150 mm in the vertical direction, an enormous number of joints and extension reinforcing bars are required to fix them to each other, and the labor involved in the fixing work is also enormous. It was something.

Patent No. 3424012 Japanese Patent No. 4663074

  The present invention has been made in view of the above-described problems, and its technical problem is to reduce the number of parts necessary for fixing shear reinforcement bars in a hollow tower-like concrete structure such as a bridge pier, and thus the construction cost. It is to reduce the amount.

  As means for effectively solving the above technical problem, the bar arrangement structure of the corner portion of the hollow tower structure according to the invention of claim 1 is embedded in the inner periphery of the hollow tower structure. An outer shear reinforcing bar in which an end portion of the inner shear reinforcing bar extending from the inner peripheral part toward the outer peripheral part at the corner part of the hollow tower-like structure is embedded in the outer peripheral part of the hollow tower-like structure. It is located on the inner peripheral side, and is provided with fixing means for cast-in-place concrete at the end.

  Further, the bar arrangement structure of the corner portion of the hollow tower structure according to the invention of claim 2 is the structure of claim 1, wherein the corner portion includes the end portions of the inner shear reinforcement bars that intersect each other at substantially right angles. One of these comprises an extended reinforcing bar joined to the body of the inner shear reinforcing bar via a joint.

  According to a third aspect of the present invention, the bar arrangement of the corner portion of the hollow tower structure is the dowel reinforcing bar in which the fixing means is arranged in the axial direction of the hollow tower structure. It is to be hooked on.

  Further, the bar arrangement structure of the corner portion of the hollow tower structure according to the invention of claim 4 comprises the hook of a shape in which the fixing means is bent along a virtual plane in the configuration of claim 1, The plane is inclined with respect to the cross section orthogonal to the axial direction of the hollow tower-like structure.

  Further, the bar arrangement structure of the corner portion of the hollow tower structure according to the invention of claim 5 is the structure according to claim 1, wherein the fixing means is formed with the end portion of the inner shear reinforcement bar on the surface. It is bent into a substantially U shape so that a large number of nodes face inward and outward in the bending direction.

  According to the reinforcing bar structure of the corner portion of the hollow tower-like structure according to the present invention, it is not necessary to attach a coupling metal fitting such as a short reinforcing bar to fix the end of the inner shear reinforcing bar to the outer shear reinforcing bar, Since there is no need for a joint for joining the end portion of the inner shear reinforcement bar and the coupling fitting, it is possible to reduce the number of parts necessary for fixing the shear reinforcement bar, and thus to reduce the labor and cost of construction. .

  Further, if one of the ends of the inner shear reinforcement bars crossing each other at a substantially right angle at the corner portion is an extension reinforcing bar joined to the inner shear reinforcement main body via a joint, the inner precast concrete In the process of building the formwork, the ends of the inner shear reinforcement bars do not cross and interfere with each other.

  Moreover, stable fixing can be performed by fixing the fixing means to the dowel reinforcing bars arranged in the axial direction of the hollow tower structure.

  Further, if the fixing means is formed of a hook having a shape bent along a virtual plane, and the virtual plane is inclined with respect to a cross section perpendicular to the axial direction of the hollow tower-like structure, the structural body (location) Even if cracks occur along the hook in the concrete), the expansion is effectively suppressed.

  Further, if the fixing means is formed by bending the end portion of the inner shear reinforcing bar into a substantially U shape so that a large number of nodes formed on the surface face the inner side and the outer side in the bending direction, Even if cracks along the inner shear reinforcement occur in the cast-in-place concrete), the amount of the inner shear reinforcement can be effectively reduced.

  Hereinafter, a preferred embodiment of a bar arrangement structure of a corner portion of a hollow tower structure according to the present invention will be described with reference to the drawings. FIG. 1 is a horizontal sectional view showing a first embodiment using a hook as a fixing means in the bar arrangement structure of the hollow tower structure according to the present invention, and FIG. 2 is used in the first embodiment. FIG. 3 is a plan view showing an example of a hook, FIG. 3 is a view showing a fixing state of the hook, (A) is a plan view, and (B) is a BB cross-sectional view in (A).

  A hollow SRC pier 1 shown in FIG. 1 has precast concrete molds 10 and 20 installed on the outer periphery and the inner periphery, and a reinforcing material unit 30 is erected vertically at predetermined intervals between the molds 10 and 20. It is constructed by placing and casting cast-in-place concrete 40. The reinforcing material unit 30 is called a spiral column, and has a steel frame 31 such as H-shaped steel, a plurality of deformed reinforcing bars 32 arranged in parallel around the steel frame 31, and a small diameter wound around the deformed reinforcing bar 32 in a spiral shape. The PC steel bar 33 in the reinforcing material unit 30 has both functions of preventing buckling of the steel frame 31 and the deformed reinforcing bar 32 and functioning as an intermediate reinforcing bar for the pier 1 as a whole. . The pier 1 corresponds to the hollow tower structure described in claim 1.

  The outer precast concrete formwork 10 constituting the outer peripheral wall surface is built in a state in which a plurality of vertical projection shapes are abutted so as to form a rectangle. An outer shear reinforcement bar 11 is embedded in each outer precast concrete mold 10 so as to be horizontal in the installed state, and an end portion of the outer shear reinforcement bar 11 protruding from the edge of the outer precast concrete mold 10 is They are joined to each other via a joint 12.

  The inner precast concrete mold 20 constituting the inner peripheral wall surface is built in a state in which a plurality of the vertical projection shapes are abutted so as to form a rectangle that is slightly smaller than the outer precast concrete mold 10. An inner shear reinforcement bar 21 is embedded in each inner precast concrete mold 20 so as to be horizontal in the installed state.

  Of the inner precast concrete molds 20 (20A, 20B) that are abutted at right angles at the corner 1A of the pier 1, the inner shear reinforcement 21 embedded in the mold 20A has an end 21a at the end 21a. It protrudes from the edge of 20A and extends to the vicinity of the inner surface of the outer precast concrete mold 10, and a substantially U-shaped hook 21b as a fixing means is formed at the tip.

  As shown in FIG. 2, the hook 21 b substantially extends along an imaginary plane so that a large number of nodes 21 c formed on the surface of the end 21 a of the inner shear reinforcing bar 21 face inward and outward in the bending direction. It is bent into a U shape. As shown in FIG. 1, the hook 21 b is a dowel reinforcing bar 22 disposed substantially parallel (axial direction) to the reinforcing material unit 30 between the reinforcing material units 30, 30 installed at the corner portion 1 </ b> A. 3B, the virtual plane (the plane X passing through the axis of the hook 21b) is in the axial direction of the pier 1 (the dowels). It is inclined with respect to a cross section orthogonal to the extending direction of the reinforcing bars 22.

  Of the inner precast concrete molds 20 (20A, 20B) which are abutted at right angles in the corner 1A, the inner shear reinforcement bars 21 embedded in the other mold 20B also have an end 21c at the end 20c. However, the length is short so as not to intersect the end portion 21a of the inner shear reinforcement 21 with the hook 21b protruding from the inner precast concrete mold 20A. An extension reinforcing bar 24 orthogonal to the end 21a of the inner shear reinforcement bar 21 with the hook 21b is joined to the short end part 21c via a joint 23. A substantially U-shaped hook 24a is formed.

  The hook 24a formed on the extended reinforcing bar 24 is also the same as the hook 21b of the inner shear reinforcing bar 21, that is, as shown in FIG. 2, the end of the extended reinforcing bar 24 is formed on the surface thereof. A plurality of nodes 24b are bent into a substantially U shape along a virtual plane so that the nodes 24b face inward and outward in the bending direction. And this hook 24a is also placed in a state where it is hooked on the dowel reinforcing bar 22 disposed substantially parallel (axial direction) to the reinforcing material unit 30 between the reinforcing material units 30 and 30 installed in the corner portion 1A. 3A. As shown in FIG. 3B, the virtual plane (plane X passing through the axis of the hook 24a) is orthogonal to the axial direction of the pier 1 (extension direction of the dowel reinforcing bar 22). It is inclined with respect to the cross section.

  4-6 shows the construction procedure of the hollow SRC pier which has the bar arrangement structure by the 1st form mentioned above.

  That is, in the construction of this pier 1, as shown in FIG. 4, first, a plurality of outer precast concrete molds 10 are erected in a state in which a plurality of vertical projection shapes are abutted so as to form a rectangle. The ends of the outer shear reinforcement 11 projecting from both ends of the mold 10 are joined to each other via a joint 12. Then, a plurality of reinforcing material units 30 are installed at predetermined intervals at the inner peripheral position of the precast concrete mold 10.

  Next, as shown in FIG. 5, a plurality of inner precast concrete molds 20 </ b> A and 20 </ b> B are disposed on the inner peripheral side of the position where the reinforcing material unit 30 is built, and the vertical projection shape is slightly rounder than the outer precast concrete mold 10. It is built in a state of multiple collisions to form a small rectangle. The inner precast concrete molds 20A and 20B are built in a vertical direction by a crane, but the ends of the inner shear reinforcement bars 21 protruding from one inner precast concrete mold 20B are abutted at right angles to each other. Since it is shortened so as not to interfere with the end portion 21a of the inner shear reinforcement bar 21 protruding from the other inner precast concrete formwork 20A, it is possible to smoothly perform the erection operation.

  The inner precast concrete formwork 20 may be installed at a time on the inner peripheral side of the position where the reinforcing material unit 30 is built after being assembled in a state in which a plurality of vertical projection shapes are in a rectangular shape. .

  Of the inner precast concrete molds 20A and 20B that are abutted at right angles at the corner 1A, they pass through a hook 21b formed at the end 21a of the inner shear reinforcement bar 21 protruding from the edge of the mold 20A. As described above, the dowel reinforcing bar 22 is disposed between the reinforcing material units 30 and 30 of the corner portion 1A, and the hook 21b is hooked on the dowel reinforcing bar 22. At this time, as shown in FIG. 3B described above, the plane X passing through the axis of the hook 21b is inclined with respect to a cross section perpendicular to the extending direction of the dowel reinforcing bar 22.

  Next, as shown in FIG. 6, of the inner precast concrete molds 20A and 20B that are abutted at right angles at the corner 1A, the end of the inner shear reinforcement 21 that protrudes short from the edge of the mold 20B. An extension rebar 24 orthogonal to the end portion 21a of the inner shear reinforcement bar 21 on the mold 20A side is joined to 21c via a joint 23, and the corner portion 1A passes through a hook 24a formed at the tip thereof. A dowel reinforcing bar 22 is arranged between the reinforcing material units 30 and 30 at a position symmetrical to the hook 21b on the mold 20A side, and the hook 24a is hooked on the dowel reinforcing bar 22. In this case as well, as shown in FIG. 3B described above, the plane X passing through the axis of the hook 24a is inclined with respect to the cross section orthogonal to the extending direction of the dowel reinforcing bar 22.

  When the assembly of the formwork and the reinforcement work are completed by the above-described work, concrete (not shown) is placed in the space S between the outer precast concrete formwork 10 and the inner precast concrete formwork 20. The reinforcing material unit 30, the reinforcing bars 21, 22, 24, the joints 12, 23, etc. are attached to the cast-in-place concrete 40 as the concrete (the cast-in-place concrete 40 shown in FIG. 1) is hardened by a hydration reaction. The outer precast concrete formwork 10 and the inner precast concrete formwork 20 are also integrated with the cast-in-place concrete 40.

  According to the bar arrangement structure described above, it is not necessary to attach a conventional fitting to the outer shear reinforcing bar 11 in the process of bar arrangement, and the end of the inner shear reinforcing bar 21 and the above-mentioned fitting are joined. Since a large number of joints are not required, the number of parts can be reduced, and the construction effort and construction cost can be greatly reduced.

  Further, by fixing hooks 21b and 24a as fixing means for the inner shear reinforcing bar 21 to the dowel reinforcing bar 22 arranged in the axial direction, stable fixing can be performed. Moreover, as shown in FIG. 3 (B), even if a crack C passing through the hook 21b or 24a occurs in the cast-in-place concrete 40, such a crack C is usually a cross section perpendicular to the axial direction of the pier 1 ( Since the virtual plane X passing through the axial center of the hooks 21b and 24a is inclined with respect to the cross section orthogonal to the axial direction of the pier 1, the crack C is generated. The escape of 21b is suppressed.

  Further, since the hooks 21b and 24a are formed by bending the end portions of the inner shear reinforcing bars 21 (extended reinforcing bars 24) so that a large number of nodes 21c and 24b face inward and outward in the bending direction, Even if a crack is generated along the shear reinforcing bar 21 (extended reinforcing bar 24), the inner shear reinforcing bar 21 (extended reinforcing bar 24) can be effectively prevented from coming out.

  FIG. 7 shows a second embodiment in which a reinforcing bar fixing tool is used as fixing means in place of the hook in the first embodiment shown in FIG. 1 in the bar arrangement of the corner portion of the hollow tower structure according to the present invention. FIGS. 8 to 12 are explanatory views showing examples of reinforcing bar fixing tools used in the second embodiment.

  That is, the second embodiment shown in FIG. 7 differs from the first embodiment described above in that it protrudes from the edge of the inner precast concrete formwork 20A instead of the hooks 21b and 24a as shown in FIG. The reinforcing bar fixing tool 25 is attached to the end of the extended reinforcing bar 24 joined to the end 21a of the inner shear reinforcing bar 21 and the inner shear reinforcing bar 21 protruding from the end edge of the inner precast concrete formwork 20B via the joint 23. It is attached.

  As shown in FIG. 8, as the reinforcing bar fixing tool 25, a bolt head shape having a flange 25 a attached to the end of the inner shear reinforcing bar 21 or the extended reinforcing bar 24 and firmly fixed in the cast-in-place concrete 40. 9, as shown in FIG. 9, the flange 25 a is formed with an extension 25 b for engaging with the dowel rebar 22, and as shown in FIG. 10, the end of the inner shear reinforcement 21 21a or one that is integrally formed in the end of the extended reinforcing bar 24, or a part that is extended to form an extension 25c for engaging with the dowel reinforcing bar 22 as shown in FIG. As FIG. 12 shows, various forms, such as what formed in the edge part of the inner shear reinforcement bar | burr 21 or the extension reinforcement 24, are considered.

  13 is a horizontal sectional view showing a third embodiment in which the bar arrangement structure similar to FIG. 1 is applied to a corner portion of a pier constructed by a normal formwork, and FIG. 14 is a hook in FIG. Instead, it is a horizontal sectional view showing a fourth form using a reinforcing bar fixing tool as fixing means.

  That is, in the third embodiment shown in FIG. 13, the hollow SRC pier 1 assembles the molds 2 and 3 on the outer periphery and the inner periphery, and the reinforcing material units 30 are arranged at predetermined intervals between the molds 2 and 3. It is constructed by placing it vertically and placing cast-in-place concrete 40. The reinforcing material unit 30 is the same as that shown in FIG.

  Specifically, in the reinforcement work in the construction of the pier 1, the outer shear reinforcement 11 is disposed between the outer mold 2 and the reinforcement unit 30, and the inner mold 3 and the reinforcement unit are arranged. An inner shear reinforcement bar 21 is disposed between the inner shear reinforcement bar 30 and the inner shear reinforcement bar 21. Each inner shear reinforcement bar 21 is formed with a substantially U-shaped hook 21b as a fixing means at an end portion that intersects each other at the corner 1A and extends to the vicinity of the inner surface of the outer mold 2; A dowel reinforcing bar 22 is disposed between the reinforcing material units 30 and 30 of the corner portion 1A so as to pass through the hook 21b, and the hook 21b is hooked on the dowel reinforcing bar 22.

  That is, in this embodiment, each inner shear reinforcing bar 21 is different from that provided integrally with the precast concrete mold, and it is not necessary to shorten the end of one inner shear reinforcing bar 21 and join the extended reinforcing bar.

  In this case as well, it is preferable to incline the plane passing through the axis of the hook 21b with respect to the cross section perpendicular to the axial direction of the pier 1 (extension direction of the dowel reinforcing bar 22).

  When the assembly of the molds 2 and 3 and the reinforcement work are completed, the cast-in-place concrete 40 is placed in the space between the molds 2 and 3. The reinforcing material unit 30 and the reinforcing bars 21 are integrated with the cast-in-place concrete 40 as the concrete 40 is hardened by a hydration reaction. When the required strength is developed in the cast-in-place concrete 40, the molds 2 and 3 are disassembled and removed.

  Also in this embodiment, there is no need to attach a conventional fitting to the outer shear reinforcement 11 in the process of bar arrangement work, and a huge number for joining the end of the inner shear reinforcement 21 and the coupling fitting. Since the joint is not required, the number of parts can be reduced, and the labor and cost of construction can be greatly reduced, and the same effect as that of the first embodiment can be achieved.

  Further, the fourth embodiment shown in FIG. 14 is different from the third embodiment described above in that the inner shear reinforcement bars 21 intersecting at right angles at the corner 1A instead of the hooks 21b as shown in FIG. The reinforcing bar fixing tool 25 is attached to each end.

  Also in this case, as the reinforcing bar fixing tool 25, the one shown in FIGS. 8 to 12 described above can be used.

It is a horizontal sectional view which shows the 1st form which used the hook for the fixing means in the bar arrangement of the corner part of the hollow tower-shaped structure which concerns on this invention. It is a top view which shows the example of the hook used with a 1st form. It is a figure which shows the fixing state of the hook in a 1st form, (A) is a top view, (B) is BB sectional drawing in (A). It is a horizontal sectional view which shows the construction procedure of the hollow pier which has a bar arrangement structure by a 1st form. It is a horizontal sectional view which shows the construction procedure of the hollow pier which has a bar arrangement structure by a 1st form. It is a horizontal sectional view which shows the construction procedure of the hollow pier which has a bar arrangement structure by a 1st form. It is a horizontal sectional view which shows the 2nd form which used the reinforcing bar fixing tool as a fixing means in the bar arrangement of the corner part of the hollow tower-like structure which concerns on this invention. It is explanatory drawing which shows the example of the reinforcing bar fixing tool used with a 2nd form. It is explanatory drawing which shows the example of the reinforcing bar fixing tool used with a 2nd form. It is explanatory drawing which shows the example of the reinforcing bar fixing tool used with a 2nd form. It is explanatory drawing which shows the example of the reinforcing bar fixing tool used with a 2nd form. It is explanatory drawing which shows the example of the reinforcing bar fixing tool used with a 2nd form. It is a horizontal sectional view which shows the 3rd form which applied the bar arrangement structure similar to FIG. 1 to the corner part of the pier constructed by a normal formwork. It is a horizontal sectional view showing the 4th form using a reinforcing bar fixing tool as fixing means instead of the hook in FIG. It is a perspective view which shows the construction process of the conventional hollow pier. It is a horizontal sectional view which shows the bar arrangement structure of the corner part in the conventional hollow pier of FIG. It is a horizontal sectional view which shows the construction procedure of the conventional hollow pier. It is a horizontal sectional view which shows the construction procedure of the conventional hollow pier. It is a horizontal sectional view which shows the construction procedure of the conventional hollow pier.

Explanation of symbols

1 Pier (hollow tower structure)
1A Corner part 10 Outer precast concrete form 11 Outer shear reinforcement bars 12 and 23 Joint 20 (20A, 20B) Inner precast concrete form 21 Inner shear reinforcement bars 21b and 24a Hook 21c Node 22 Dowel rebar 24 Extension rebar 25 Reinforcing bar fixing tool 30 Reinforcement unit 40 Cast-in-place concrete

Claims (5)

  The end of the inner shear reinforcement bar embedded in the inner peripheral part of the hollow tower-like structure and extending from the inner peripheral part to the outer peripheral part at the corner part of the hollow tower-like structure, A corner of a hollow tower-like structure, which is located on the inner circumference side from an outer shear reinforcement bar embedded in the outer circumference of the shaped structure and is provided with fixing means for cast-in-place concrete at the end. Reinforcing bar structure.   The one of the ends of the inner shear reinforcing bars that intersect each other at a substantially right angle at the corner portion is formed by an extended reinforcing bar joined to the main body of the inner shear reinforcing bar through a joint. Reinforcement structure at the corner of a hollow tower structure.   2. The bar arrangement structure of the corner portion of the hollow tower structure according to claim 1, wherein the fixing means is hooked on a dowel reinforcing bar extending in the axial direction at the corner portion.   2. The fixing device according to claim 1, wherein the fixing unit includes a hook having a shape bent along a virtual plane, and the virtual plane is inclined with respect to a cross section perpendicular to the axial direction of the hollow tower-like structure. Reinforcement structure at the corner of a hollow tower structure.   2. The fixing means according to claim 1, wherein the fixing means is formed by bending an end portion of the inner shear reinforcing bar into a substantially U shape so that a large number of nodes formed on the surface face the inner side and the outer side in the bending direction. The bar arrangement structure of the corner part of the hollow tower-like structure of description.

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