JP6838908B2 - How to introduce tension force of tension material - Google Patents

How to introduce tension force of tension material Download PDF

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JP6838908B2
JP6838908B2 JP2016188029A JP2016188029A JP6838908B2 JP 6838908 B2 JP6838908 B2 JP 6838908B2 JP 2016188029 A JP2016188029 A JP 2016188029A JP 2016188029 A JP2016188029 A JP 2016188029A JP 6838908 B2 JP6838908 B2 JP 6838908B2
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tension
tension material
concrete
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顕 小林
顕 小林
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Shimizu Corp
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Description

本発明は、プレストレスコンクリートの緊張材の緊張力導入方法に関する。 The present invention relates to a method for introducing a tension force of a tension material of prestressed concrete.

従来、プレストレスコンクリートのＰＣ鋼材などの緊張材に緊張力を導入する場合、緊張材の端部から緊張力を導入している（例えば、特許文献１参照）。緊張材に緊張力を導入した後には、緊張材とコンクリートとの定着部をカバーコンクリートや無収縮モルタルなどで跡埋めしている。 Conventionally, when a tension force is introduced into a tension material such as a PC steel material of prestressed concrete, the tension force is introduced from an end portion of the tension material (see, for example, Patent Document 1). After introducing the tension force into the tension material, the fixing part between the tension material and the concrete is filled with cover concrete or non-shrink mortar.

特開２０１４−２３７９５１号公報Japanese Unexamined Patent Publication No. 2014-237951

しかしながら、緊張材の端部は、外部に露出していることが多いため、緊張材の端部からコンクリートや緊張材の劣化の原因となる劣化因子が侵入する虞がある。 However, since the end portion of the tension material is often exposed to the outside, there is a possibility that a deterioration factor that causes deterioration of concrete or the tension material may invade from the end portion of the tension material.

そこで、本発明は、緊張材の端部から劣化因子が侵入することを抑制できる緊張材の緊張力導入方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a method for introducing a tension force of a tension material capable of suppressing the invasion of a deterioration factor from an end portion of the tension material.

上記目的を達成するため、プレストレスコンクリートの緊張材に緊張力を導入する緊張材の緊張力導入方法において、前記緊張材を構成する第１緊張材と第２緊張材とを対向させて同軸に配置する緊張材配置工程と、前記第１緊張材および前記第２緊張材の互いに離間する端部側が露出しないように挿入されて固定されるとともに、前記第１緊張材および前記第２緊張材の互いに対向する端部側を露出させる空部を有する空部有コンクリート部材を形成する空部有コンクリート部材形成工程と、前記空部有コンクリート部材形成工程の後に、前記空部に露出した前記第１緊張材および前記第２緊張材それぞれに互いに近接する方向の緊張力を導入する緊張力導入工程と、前記緊張力導入工程の後に、緊張力が導入された前記第１緊張材と前記第２緊張材とを接続具で接続する緊張材接続工程と、を有し、前記緊張材配置工程では、前記第１緊張材と前記第２緊張材とを前記接続具を仮締めして仮接続し、前記緊張材接続工程では、前記第１緊張材と前記第２緊張材とを前記接続具を本締めして接続することを特徴とする。 In order to achieve the above object, in the method of introducing the tension force of the tension material for introducing the tension force into the tension material of the prestressed concrete, the first tension material and the second tension material constituting the tension material are opposed to each other and coaxially. The tension material arranging step of arranging the tension material and the end side of the first tension material and the second tension material that are separated from each other are inserted and fixed so as not to be exposed, and the first tension material and the second tension material are inserted and fixed so as not to be exposed. After the vacant concrete member forming step of forming an vacant concrete member having an vacant portion that exposes end sides facing each other and the vacant concrete member forming step, the first exposed to the vacant portion. A tension force introduction step of introducing a tension force in a direction close to each other into the tension material and the second tension material, and the first tension material and the second tension material into which the tension force is introduced after the tension force introduction step. It has a tension material connecting step of connecting the members with a connector, and in the tension material arranging step, the first tension material and the second tension material are temporarily fastened by temporarily tightening the connecting tool to temporarily connect the first tension material and the second tension material. The tension material connecting step is characterized in that the first tension material and the second tension material are connected by fully tightening the connecting tool .

本発明では、第１緊張材および第２緊張材の互いに離間する端部側が空部有コンクリート部材に露出しないように挿入されているため、第１緊張材および第２緊張材の互いに離間する側の端部から劣化因子が侵入することを抑制できる。
また、従来、橋梁の床版に緊張材としてせん断鋼棒などの緊張材を設ける場合は、緊張材の端部が露出する床版に切欠きを形成するため、切欠き部を考慮した耐久性を検討する必要があるが、本発明ではそのような切欠きを形成する必要がないため、耐久性を確実に確保することができる。
また、本発明に係る緊張材の緊張力導入方法では、前記緊張材配置工程では、前記第１緊張材と前記第２緊張材とを前記緊張材接続工程において接続する接続具で仮接続している。
このような構成とすることにより、第１緊張材と第２緊張材とを接続する接続具を利用して、第１緊張材と第２緊張材とを容易に同軸状態に維持することができる。また、第１緊張材と第２緊張材とを精度よく接続することができる。 In the present invention, since the end side of the first tension material and the second tension material separated from each other is inserted so as not to be exposed to the empty concrete member, the side of the first tension material and the second tension material separated from each other. It is possible to suppress the invasion of deterioration factors from the end of the concrete.
In addition, conventionally, when a tension material such as a shear steel rod is provided as a tension material on the floor slab of a bridge, a notch is formed in the floor slab where the end of the tension material is exposed. However, in the present invention, it is not necessary to form such a notch, so that durability can be reliably ensured.
Further, in the method for introducing a tension force of a tension material according to the present invention, in the tension material arranging step, the first tension material and the second tension material are temporarily connected by a connecting tool for connecting in the tension material connecting step. There is.
With such a configuration, the first tension material and the second tension material can be easily maintained in a coaxial state by using a connector for connecting the first tension material and the second tension material. .. Further, the first tension material and the second tension material can be connected with high accuracy.

また、本発明に係る緊張材の緊張力導入方法では、前記緊張材配置工程では、前記第１緊張材と前記第２緊張材とを前記緊張材接続工程において接続する接続具で仮接続してもよい。
このような構成とすることにより、第１緊張材と第２緊張材とを接続する接続具を利用して、第１緊張材と第２緊張材とを容易に同軸状態に維持することができる。また、第１緊張材と第２緊張材とを精度よく接続することができる。 Further, in the method for introducing a tension force of a tension material according to the present invention, in the tension material arranging step, the first tension material and the second tension material are temporarily connected by a connecting tool for connecting in the tension material connecting step. May be good.
With such a configuration, the first tension material and the second tension material can be easily maintained in a coaxial state by using a connector for connecting the first tension material and the second tension material. .. Further, the first tension material and the second tension material can be connected with high accuracy.

また、本発明に係る緊張材の緊張力導入方法では、前記緊張力導入工程では、前記第１緊張材および前記第２緊張材それぞれに固定された引寄用金具を互いに離間する側から挟み込み、前記第１緊張材に固定された前記引寄用金具と前記第２緊張材に固定された前記引寄用金具とを互いに引き寄せるようにして前記第１緊張材および前記第２緊張材に緊張力を導入してもよい。
このような構成とすることにより、第１緊張材および第２緊張材に対して同時に緊張力を導入することができる。 Further, in the method for introducing the tension force of the tension material according to the present invention, in the tension force introduction step, the pulling metal fittings fixed to the first tension material and the second tension material are sandwiched from the side separated from each other. A tension force is applied to the first tension material and the second tension material so that the pulling metal fitting fixed to the first tension material and the pulling metal fitting fixed to the second tension material are attracted to each other. May be introduced.
With such a configuration, tension force can be introduced into the first tension material and the second tension material at the same time.

本発明によれば、緊張材の端部から劣化因子が侵入することを抑制できる。 According to the present invention, it is possible to suppress the invasion of deterioration factors from the end portion of the tensioning material.

本発明の第１実施形態によるコンクリート部材の一例を示す図である。It is a figure which shows an example of the concrete member by 1st Embodiment of this invention. 緊張材配置工程および空部有コンクリート部材形成工程を説明する図である。It is a figure explaining the tension material arrangement process and the concrete member forming process with an empty space. 緊張力導入工程を説明する図である。It is a figure explaining the tension force introduction process. 図３に続く緊張力導入工程および緊張材接続工程を説明する図である。It is a figure explaining the tension force introduction process and tension material connection process following FIG. 本発明の第２実施形態による空部有コンクリート部材形成工程を説明する図である。It is a figure explaining the process of forming a concrete member with an empty space by 2nd Embodiment of this invention.

（第１実施形態）
以下、本発明の第１実施形態による緊張材の緊張力導入方法について、図１乃至図４に基づいて説明する。
図１に示すように、第１実施形態による緊張材１は、ＰＣ鋼材などで、梁材等を構成するコンクリート部材２に埋設され、コンクリート部材２にプレストレスを導入している。
緊張材１は、軸方向の端面どうしを対向させて同軸に配置された第１緊張材３および第２緊張材４を有している。第１緊張材３には、第２緊張材４と離間する側の端部（第１端部３ａとする）近傍に、コンクリート部材２のコンクリート５に定着する第１定着具６が設けられている。第２緊張材４には、第１緊張材３と離間する側の端部（第２端部４ａとする）近傍にコンクリート部材２のコンクリート５に定着する第２定着具７が設けられている。 (First Embodiment)
Hereinafter, a method for introducing a tension force of a tension material according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the tension material 1 according to the first embodiment is made of PC steel or the like and is embedded in a concrete member 2 constituting a beam material or the like, and prestress is introduced into the concrete member 2.
The tension member 1 has a first tension member 3 and a second tension member 4 which are coaxially arranged so that their end faces in the axial direction face each other. The first tensioning member 3 is provided with a first fixing tool 6 for fixing to the concrete 5 of the concrete member 2 in the vicinity of an end portion (referred to as the first end portion 3a) on the side separated from the second tensioning member 4. There is. The second tensioning material 4 is provided with a second fixing tool 7 that is fixed to the concrete 5 of the concrete member 2 in the vicinity of an end portion (referred to as the second end portion 4a) on the side separated from the first tensioning material 3. ..

第１緊張材３と第２緊張材４とは、それぞれ互いに近接する側に向かう緊張力が導入された状態で、カプラなどの接続具（接続部）８によって接続されている。
本実施形態では、第１緊張材３と第２緊張材４とを互いを引き寄せるようにして緊張力を導入している。このため、第１緊張材３には、第１定着具６よりも第２緊張材４に近接する側に第１引寄用金具９が固定されている。また、第２緊張材４には、第２定着具７よりも第１緊張材３に近接する側に第２引寄用金具１０が固定されている。
第１引寄用金具９および第２引寄用金具１０は、例えば、第１緊張材３および第２緊張材４に螺合するボルトなどで構成されていて、第１緊張材３および第２緊張材４の外周面から径方向外側に突出している。
これらの第１緊張材３、第２緊張材４、第１定着具６、第２定着具７、接続具８、第１引寄用金具９および第２引寄用金具１０は、コンクリート部材２が製作されるとコンクリート５の内部に埋設されている。 The first tension material 3 and the second tension material 4 are connected by a connecting tool (connecting portion) 8 such as a coupler in a state in which tension forces toward sides close to each other are introduced.
In the present embodiment, the tension force is introduced so that the first tension material 3 and the second tension material 4 are attracted to each other. Therefore, the first tensioning member 9 is fixed to the first tensioning member 3 on the side closer to the second tensioning member 4 than the first fixing tool 6. Further, the second tension member 4 is fixed with the second pulling metal fitting 10 on the side closer to the first tension member 3 than the second fixing tool 7.
The first pulling metal fitting 9 and the second pulling metal fitting 10 are composed of, for example, bolts screwed into the first tension material 3 and the second tension material 4, and the first tension material 3 and the second tension material 3 and the second tension material 4 are formed. It protrudes outward in the radial direction from the outer peripheral surface of the tension member 4.
The first tension material 3, the second tension material 4, the first fixing tool 6, the second fixing tool 7, the connecting tool 8, the first pulling metal fitting 9, and the second pulling metal fitting 10 are concrete members 2. Is buried inside the concrete 5 when it is manufactured.

次に、コンクリート部材２の製作方法（緊張材の緊張力導入方法）について説明する。
まず、図２に示すように、コンクリート部材２の型枠（不図示）の内部に第１緊張材３および第２緊張材４を配置する（緊張材配置工程）。
第１緊張材３を第１定着具６および第１引寄用金具９が固定された状態とし、第２緊張材４を第２定着具７および第２引寄用金具１０が固定された状態とする。
第１緊張材３と第２緊張材４とを、それぞれの第１定着具６および第２定着具７が取り付けられていない側が間隔をあけて同軸に対向するように配置する。
第１緊張材３と第２緊張材４とを接続具８で仮接続する。 Next, a method of manufacturing the concrete member 2 (a method of introducing a tension force of the tension material) will be described.
First, as shown in FIG. 2, the first tension material 3 and the second tension material 4 are arranged inside the formwork (not shown) of the concrete member 2 (tensile material arrangement step).
The first tension material 3 is in a state in which the first fixing tool 6 and the first pulling metal fitting 9 are fixed, and the second tension material 4 is in a state in which the second fixing tool 7 and the second pulling metal fitting 10 are fixed. And.
The first tensioning member 3 and the second tensioning member 4 are arranged so that the sides on which the first fixing tool 6 and the second fixing tool 7 are not attached face each other coaxially with a gap.
The first tension material 3 and the second tension material 4 are temporarily connected by the connector 8.

続いて、型枠にコンクリートを打設する（空部有コンクリート部材形成工程）。
空部有コンクリート部材形成工程では、第１定着具６および第１緊張材３の第１引寄用金具９よりも第１端部３ａ側と、第２定着具７および第２緊張材４の第２引寄用金具１０よりも第２端部４ａ側と、がコンクリート５に埋設され、第１引寄用金具９および第１緊張材３の第１引寄用金具９よりも第２緊張材４側と、第２引寄用金具１０および第２緊張材４の第２引寄用金具１０よりも第１緊張材３側と、がコンクリート５に埋設されず露出するように、型枠にコンクリート５を打設する。
本実施形態では、第１引寄用金具９および第１緊張材３の第１引寄用金具９よりも第２緊張材４側と、第２引寄用金具１０および第２緊張材４の第２引寄用金具１０よりも第１緊張材３側と、がコンクリート５に埋設されず露出するように、型枠にこれらを露出させるための空部５１を形成する箱抜き用の型（不図示）を設けてコンクリート５の打設を行う。
コンクリート５を打設した後には所定の期間の養生を行う。このように形成された空部５１を有するコンクリートの部材を空部有コンクリート部材２１とする。 Subsequently, concrete is poured into the formwork (step of forming a concrete member with an empty space).
In the step of forming the concrete member with an empty space, the first fixing tool 6 and the first tensioning material 3 are on the first end 3a side of the first pulling metal fitting 9, and the second fixing tool 7 and the second tensioning material 4 are used. The second end portion 4a side of the second pulling metal fitting 10 is embedded in the concrete 5, and the first pulling metal fitting 9 and the first tension material 3 have a second tension than the first pulling metal fitting 9. The formwork so that the material 4 side and the first tension material 3 side of the second tension material 4 and the second tension material 4 are not embedded in the concrete 5 and are exposed. Concrete 5 is placed in the concrete.
In the present embodiment, the second tension material 4 side of the first pulling metal fitting 9 and the first tension material 3 with respect to the first pulling metal fitting 9, and the second pulling metal fitting 10 and the second tension material 4 A die for unboxing that forms an empty space 51 in the formwork so that the first tension material 3 side and the first tension member 3 side of the second pulling metal fitting 10 are not embedded in the concrete 5 and are exposed. The concrete 5 is placed by providing (not shown).
After placing the concrete 5, it is cured for a predetermined period. The concrete member having the vacant portion 51 formed in this way is referred to as the vacant concrete member 21.

続いて、図３および図４に示すように、第１緊張材３および第２緊張材４に緊張力を導入する（緊張力導入工程）。
第１緊張材３および第２緊張材４への緊張力の導入は、空部５１から行う。
空部５１に配置した挟み込みジャッキ１１で、第１緊張材３に固定された第１引寄用金具９、および第２緊張材４に固定された第２引寄用金具１０を同時に挟み込み、第１引寄用金具９と第２引寄用金具１０とを互いに引き寄せるようにして第１緊張材３および第２緊張材４に緊張力を導入する。 Subsequently, as shown in FIGS. 3 and 4, a tension force is introduced into the first tension member 3 and the second tension member 4 (tension force introduction step).
The tension force is introduced into the first tension material 3 and the second tension material 4 from the empty space 51.
The first pulling metal fitting 9 fixed to the first tension material 3 and the second pulling metal fitting 10 fixed to the second tension material 4 are simultaneously sandwiched between the sandwiching jacks 11 arranged in the empty portion 51, and the first 1 A tension force is introduced into the first tension member 3 and the second tension member 4 so that the pulling metal fitting 9 and the second pulling metal fitting 10 are attracted to each other.

続いて、第１緊張材３と第２緊張材４とを接続する（緊張材接続工程）。
第１緊張材３と第２緊張材４とを仮接続している接続具８を閉めこんで、接続具８で第１緊張材３と第２緊張材４とを本接続する。
このようにすることにより、第１緊張材３と第２緊張材４とが緊張力が導入された状態で接続される。 Subsequently, the first tension material 3 and the second tension material 4 are connected (tension material connecting step).
The connector 8 that temporarily connects the first tension member 3 and the second tension member 4 is closed, and the first tension member 3 and the second tension member 4 are mainly connected by the connector 8.
By doing so, the first tension material 3 and the second tension material 4 are connected in a state where the tension force is introduced.

続いて、図１に示すように、空部５１にコンクリート５を打設する（空部コンクリート打設工程）。
空部コンクリート打設工程では、第１引寄用金具９および第１緊張材３の第１引寄用金具９よりも第２緊張材４側と、第２引寄用金具１０および第２緊張材４の第２引寄用金具１０よりも第１緊張材３側と、をコンクリート５に埋設する。
コンクリート５を打設した後には所定の期間の養生を行う。
このようにすることにより、第１緊張材３および第２緊張材４それぞれの全体がコンクリート５に埋設されたコンクリート部材２が製作される。 Subsequently, as shown in FIG. 1, concrete 5 is placed in the empty space 51 (empty space concrete placing step).
In the empty concrete placing process, the second tension material 4 side of the first pulling metal fitting 9 and the first tension material 3 with respect to the first pulling metal fitting 9, and the second pulling metal fitting 10 and the second tension. The first tension material 3 side of the material 4 is embedded in the concrete 5 with respect to the second pulling metal fitting 10.
After placing the concrete 5, it is cured for a predetermined period.
By doing so, the concrete member 2 in which the entire first tension material 3 and the second tension material 4 are embedded in the concrete 5 is manufactured.

次に、上述した第１実施形態による緊張材の緊張力導入方法の作用・効果について図面を用いて説明する。
上述した第１実施形態によるプレストレスコンクリートの緊張材の緊張力導入方法では、第１緊張材３および第２緊張材４の互いに離間する側がコンクリートに埋設されているため、第１緊張材３の第１端部３ａおよび第２緊張材４の第２端部４ａから劣化因子が侵入することを抑制できる。
また、緊張材接続工程の後に、空部コンクリート打設工程を行うことにより、第１緊張材３および第２緊張材４それぞれの全体がコンクリート５に埋設されるため、第１緊張材３および第２緊張材４の劣化を防止することができる。
また、従来、橋梁の床版に緊張材としてせん断鋼棒などの緊張材を設ける場合は、緊張材の端部が露出する床版に切欠きを形成するため、切欠き部を考慮した耐久性を検討する必要があるが、本実施形態ではそのような切欠きを形成する必要がないため、耐久性を確実に確保することができる。 Next, the action / effect of the method for introducing the tension force of the tension material according to the first embodiment described above will be described with reference to the drawings.
In the method for introducing the tension force of the tension material of the prestressed concrete according to the first embodiment described above, since the sides of the first tension material 3 and the second tension material 4 that are separated from each other are embedded in the concrete, the first tension material 3 is used. It is possible to suppress the invasion of deterioration factors from the first end portion 3a and the second end portion 4a of the second tension material 4.
Further, since the entire first tension material 3 and the second tension material 4 are buried in the concrete 5 by performing the empty concrete placing process after the tension material connecting step, the first tension material 3 and the first tension material 3 and the second tension material 4 are buried in the concrete 5. 2 Deterioration of the tension material 4 can be prevented.
In addition, conventionally, when a tension material such as a shear steel rod is provided as a tension material on the floor slab of a bridge, a notch is formed in the floor slab where the end of the tension material is exposed. However, in the present embodiment, it is not necessary to form such a notch, so that durability can be reliably ensured.

また、緊張材配置工程では、第１緊張材３と第２緊張材４とを緊張材接続工程において接続する接続具８で仮接続することにより、第１緊張材３と第２緊張材４とを接続する接続具８を利用して、第１緊張材３と第２緊張材４とを容易に同軸状態に維持することができる。また、第１緊張材３と第２緊張材４とを精度よく接続することができる。
また、緊張力導入工程では、第１引寄用金具９と第２引寄用金具１０とを互いに離間する側から挟み込み、第１引寄用金具９と第２引寄用金具１０とを互いに引き寄せるようにして第１緊張材３および第２緊張材４に緊張力を導入することにより、第１緊張材３および第２緊張材４に対して同時に緊張力を導入することができる。 Further, in the tension material arranging step, the first tension material 3 and the second tension material 4 are connected to each other by temporarily connecting the first tension material 3 and the second tension material 4 with a connecting tool 8 that connects the tension material 3 and the second tension material 4 in the tension material connecting step. The first tension member 3 and the second tension member 4 can be easily maintained in a coaxial state by using the connector 8 for connecting the first tension member 3. Further, the first tension member 3 and the second tension member 4 can be connected with high accuracy.
Further, in the tension force introducing step, the first pulling metal fitting 9 and the second pulling metal fitting 10 are sandwiched from the side separated from each other, and the first pulling metal fitting 9 and the second pulling metal fitting 10 are placed on each other. By introducing the tension force into the first tension material 3 and the second tension material 4 in such a manner as to attract the tension material 3, the tension force can be introduced into the first tension material 3 and the second tension material 4 at the same time.

（第２実施形態）
次に、第２実施形態について、添付図面に基づいて説明するが、上述の第１実施形態と同一又は同様な部材、部分には同一の符号を用いて説明を省略し、第１実施形態と異なる構成について説明する。
図５示すように、第２実施形態による緊張力導入方法では、空部有コンクリート部材形成工程において、複数のプレキャストコンクリート部材２２を接合させることで空部有コンクリート部材２１Ｂを形成している。第２実施形態では、空部有コンクリート部材２１Ｂは、それぞれ空部５１の略半分に相当する切欠き部５２，５２が形成された２つのプレキャストコンクリート部材２２，２２で構成されている。空部有コンクリート部材２１Ｂは、２つのプレキャストコンクリート部材２２が第１緊張材３および第２緊張材４の延在方向に互いの切欠き部５２，５２を突き合わせるように配列されて接合されることで形成されている。 (Second Embodiment)
Next, the second embodiment will be described with reference to the accompanying drawings, but the same or similar members and parts as those in the first embodiment will be described by using the same reference numerals, and the description will be omitted. Different configurations will be described.
As shown in FIG. 5, in the tension force introduction method according to the second embodiment, the empty concrete member 21B is formed by joining a plurality of precast concrete members 22 in the empty concrete member forming step. In the second embodiment, the empty concrete member 21B is composed of two precast concrete members 22 and 22 having notches 52 and 52 corresponding to substantially half of the empty 51, respectively. The empty concrete member 21B is joined by arranging and joining two precast concrete members 22 so as to abut each other notches 52 and 52 in the extending direction of the first tension member 3 and the second tension member 4. It is formed by.

２つのプレキャストコンクリート部材２２のうちの一方は、第１緊張材３の第２緊張材４と離間する側が露出しないように埋設された状態に製作され、他方は、第２緊張材４の第１緊張材３と離間する側が露出しないように埋設された状態に製作されている。そして、２つのプレキャストコンクリート部材２２，２２が接合されると、第１緊張材３および第２緊張材４が同軸に配置される。
なお、２つのプレキャストコンクリート部材２２，２２は、一方が第１緊張材３の第２緊張材４と離間する側を接合可能なカプラなどの継手が埋設された状態に製作され、他方が第２緊張材４の第１緊張材３と離間する側を接合可能なカプラなどの継手が埋設された状態に製作され、これらの継手に第１緊張材３および第２緊張材４が接合されるように構成されていてもよい。 One of the two precast concrete members 22 is manufactured so as to be buried so that the side of the first tension material 3 separated from the second tension material 4 is not exposed, and the other is the first of the second tension material 4. It is manufactured so as to be buried so that the side separated from the tension material 3 is not exposed. Then, when the two precast concrete members 22, 22 are joined, the first tension member 3 and the second tension member 4 are coaxially arranged.
The two precast concrete members 22, 22 are manufactured in a state in which one is embedded with a joint such as a coupler capable of joining the side of the first tension material 3 separated from the second tension material 4, and the other is the second. It is manufactured in a state where joints such as couplers that can join the side of the tension material 4 that is separated from the first tension material 3 are embedded, and the first tension material 3 and the second tension material 4 are joined to these joints. It may be configured in.

第２実施形態による緊張力導入方法では、第１実施形態と同様の効果を奏するとともに、空部有コンクリート部材２１Ｂがプレキャストコンクリート部材２２で構成されているため、空部有コンクリート部材２１Ｂを短期間で製作することができる。 The tension force introduction method according to the second embodiment has the same effect as that of the first embodiment, and since the empty concrete member 21B is composed of the precast concrete member 22, the empty concrete member 21B can be used for a short period of time. Can be manufactured with.

以上、本発明による緊張材の緊張力導入方法の実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。
例えば、上記の実施形態では、緊張材接続工程の後に、空部５１にコンクリート５を打設する空部コンクリート打設工程を行っているが、空部５１を残したままで良い場合は、空部コンクリート打設工程を行わなくてもよい。 Although the embodiment of the method for introducing the tension force of the tension material according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately changed without departing from the gist thereof.
For example, in the above embodiment, after the tension material connecting step, the empty concrete placing step of placing the concrete 5 in the empty space 51 is performed, but if the empty space 51 can be left as it is, the empty space 51 is used. It is not necessary to perform the concrete placing process.

また、上記の実施形態では、緊張材配置工程において第１緊張材３と第２緊張材４とを接続具８で仮接続しているが、接続具８以外の部材で仮接続してもよいし、緊張材配置工程において第１緊張材３と第２緊張材４とを仮接続しなくてもよい。
また、上記の実施形態では、緊張力導入工程において第１引寄用金具９と第２引き寄せ金具とを引き寄せるようにして第１緊張材３および第２緊張材４に緊張力を導入しているが、第１緊張材３および第２緊張材４に張力を導入する方法は上記以外でもよい。 Further, in the above embodiment, the first tension material 3 and the second tension material 4 are temporarily connected by the connecting tool 8 in the tension material arranging step, but the first tension material 3 and the second tension material 4 may be temporarily connected by a member other than the connecting tool 8. However, it is not necessary to temporarily connect the first tension material 3 and the second tension material 4 in the tension material arrangement step.
Further, in the above embodiment, the tension force is introduced into the first tension member 3 and the second tension member 4 so as to attract the first pulling metal fitting 9 and the second pulling metal fitting in the tension force introducing step. However, the method of introducing tension into the first tension material 3 and the second tension material 4 may be other than the above.

１ 緊張材
２ コンクリート部材
３ 第１緊張材
３ａ 第１端部
４ 第２緊張材
４ａ 第２端部
５ コンクリート
６ 第１定着具
７ 第２定着具
８ 接続具（接続部）
９ 第１引寄用金具
１０ 第２引寄用金具
２１，２１Ｂ 空部有コンクリート部材
２２ プレキャストコンクリート部材
５１ 空部 1 Tension material 2 Concrete member 3 1st tension material 3a 1st end 4 2nd tension material 4a 2nd end 5 Concrete 6 1st fixing tool 7 2nd fixing tool 8 Connector (connection part)
9 1st pulling metal fittings 10 2nd pulling metal fittings 21 and 21B Empty concrete member 22 Precast concrete member 51 Empty part

Claims (3)

プレストレスコンクリートの緊張材に緊張力を導入する緊張材の緊張力導入方法において、
前記緊張材を構成する第１緊張材と第２緊張材とを対向させて同軸に配置する緊張材配置工程と、
前記第１緊張材および前記第２緊張材の互いに離間する端部側が露出しないように挿入されて固定されるとともに、前記第１緊張材および前記第２緊張材の互いに対向する端部側を露出させる空部を有する空部有コンクリート部材を形成する空部有コンクリート部材形成工程と、
前記空部有コンクリート部材形成工程の後に、前記空部に露出した前記第１緊張材および前記第２緊張材それぞれに互いに近接する方向の緊張力を導入する緊張力導入工程と、
前記緊張力導入工程の後に、緊張力が導入された前記第１緊張材と前記第２緊張材とを接続具で接続する緊張材接続工程と、を有し、
前記緊張材配置工程では、前記第１緊張材と前記第２緊張材とを前記接続具を仮締めして仮接続し、
前記緊張材接続工程では、前記第１緊張材と前記第２緊張材とを前記接続具を本締めして接続することを特徴とする緊張材の緊張力導入方法。 Introducing tension into prestressed concrete tensioning material In the tensioning material introduction method,
A tension material arranging step of arranging the first tension material and the second tension material constituting the tension material so as to face each other and coaxially.
The first tension material and the second tension material are inserted and fixed so as not to be exposed from each other, and the end sides of the first tension material and the second tension material facing each other are exposed. An empty concrete member forming process for forming an empty concrete member having an empty space to be formed,
After the step of forming the concrete member with an empty space, a tension force introducing step of introducing a tension force in a direction close to each other into the first tension material and the second tension material exposed in the empty space, and
After the tension force introduction step, the tension material connecting step of connecting the first tension material into which the tension force has been introduced and the second tension material with a connecting tool is provided .
In the tension material arranging step, the first tension material and the second tension material are temporarily connected by temporarily tightening the connector.
In the tension material connecting step, a method for introducing a tension force of a tension material, which comprises connecting the first tension material and the second tension material by fully tightening the connecting tool. 前記緊張材接続工程の後に、前記空部にコンクリートを打設し前記第１緊張材と前記第２緊張材との接続部を前記コンクリートに埋設する空部コンクリート打設工程を有することを特徴とする請求項１に記載の緊張材の緊張力導入方法。 After the tension material connecting step, it is characterized by having an empty concrete placing step of placing concrete in the empty space and burying the connecting portion between the first tension material and the second tension material in the concrete. The method for introducing a tension force of a tension material according to claim 1. 前記緊張力導入工程では、前記第１緊張材および前記第２緊張材それぞれに固定された引寄用金具を互いに離間する側から挟み込み、前記第１緊張材に固定された前記引寄用金具と前記第２緊張材に固定された前記引寄用金具とを互いに引き寄せるようにして前記第１緊張材および前記第２緊張材に緊張力を導入することを特徴とする請求項１または２に記載の緊張材の緊張力導入方法。 In the tensioning force introducing step, the pulling metal fittings fixed to the first tensioning material and the second tensioning material are sandwiched from sides separated from each other, and the pulling metal fittings fixed to the first tensioning material are combined with the pulling metal fittings. The first or second aspect of claim 1 or 2 , wherein a tension force is introduced into the first tension material and the second tension material by attracting the pulling metal fittings fixed to the second tension material to each other. How to introduce the tension of the tension material.
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