JP4779093B2 - Intermediate fixing tool for PC tension material and fixing method - Google Patents

Intermediate fixing tool for PC tension material and fixing method Download PDF

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JP4779093B2
JP4779093B2 JP2006102086A JP2006102086A JP4779093B2 JP 4779093 B2 JP4779093 B2 JP 4779093B2 JP 2006102086 A JP2006102086 A JP 2006102086A JP 2006102086 A JP2006102086 A JP 2006102086A JP 4779093 B2 JP4779093 B2 JP 4779093B2
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tension
intermediate fixing
tendon
shaped
fixing tool
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JP2007277826A (en
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泰清 生田
和男 手嶋
寛幸 一ノ瀬
貴臣 土渕
哲夫 原田
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Oriental Shiraishi Corp
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Description

本発明は、コンクリート構造物における緊張材の中間定着具および定着方法に関する。   The present invention relates to an intermediate fixing tool and a fixing method for tendons in a concrete structure.

従来、コンクリート構造物にプレストレスを付与する緊張材をコンクリートに定着する方法に関しては、例えば、特許文献１〜３に開示された構造・方法が知られている。いずれも緊張材とそれを取り巻く環状定着具との隙間に膨張材を流し込み、膨張圧がでた段階で、定着具に引張負荷をかけるようにしている。緊張材は膨張材の膨張圧による摩擦力で定着される。しかし、これらの定着方法は、緊張材に露出している端末がある場合の定着構造・方法であって、以下に示すような連続していて端末がない場合の緊張材の中間部における定着に適用することはできない。   Conventionally, as to a method for fixing a tension material that applies prestress to a concrete structure to concrete, for example, structures and methods disclosed in Patent Documents 1 to 3 are known. In either case, the expansion material is poured into the gap between the tension material and the annular fixing tool surrounding the tension material, and a tensile load is applied to the fixing device when the expansion pressure is generated. The tendon is fixed by the frictional force generated by the expansion pressure of the expansion material. However, these fixing methods are fixing structures / methods when there is a terminal exposed to the tendon, and for fixing at the intermediate part of the tendon when there is no terminal as shown below. It cannot be applied.

すなわち、図４に示すような、既設の連続したコンクリート構造物２１の端部から中央寄りに離れた部分で、ある区間を解体・撤去するような工事を行う場合に、その解体・撤去部２２の両側のコンクリートにおいて、解体前にＰＣ鋼材等の緊張材２３により付与されていたプレストレスを、解体後も維持すべく緊張材２３を継続使用する際の中間定着工法への適用は考慮されていない。   That is, in the case of performing construction such as dismantling / removing a certain section at a portion away from the end of the existing continuous concrete structure 21 as shown in FIG. In the concrete on both sides, application to the intermediate fixing method when the pre-stress applied by the tension member 23 such as PC steel before the dismantling is maintained after the dismantling is maintained is considered. Absent.

一方、長尺の緊張材２３の中間部における定着方法として、例えば図５（ａ）〜（ｃ）に示すような方法が知られている。この方法では、解体により露出した緊張材２３の根元部を、２個の鋼製ブロック２４，２５で挟んでボルト締めし、両ブロック２４，２５をコンクリート２６に定着する。両ブロック２４，２５の対向面には緊張材２３を挟み込む溝２７が形成されている。しかし、この方法では、緊張材２３の径に応じた寸法に溝２７を加工する必要があるなどブロック２４，２５の加工が面倒であると共に、例えば、緊張材２３を挟んでブロック２４，２５を締め付けるボルト本数が８〜１２本程度必要となり、ブロック２４，２５の長さが３０ｃｍ程度で、質量が約２５ｋｇとなるような場合があって、そのセット作業が２人がかりとなったり、ボルト締めに電動工具が必要となって作業が大変になるという問題がある。
特公平７−６８７７１号公報 特開平３−１８３８４９号公報 特開平４−１６６７５号公報 On the other hand, as a fixing method at an intermediate portion of the long tension material 23, for example, methods shown in FIGS. 5A to 5C are known. In this method, the base of the tension member 23 exposed by dismantling is sandwiched between two steel blocks 24 and 25 and bolted to fix the blocks 24 and 25 to the concrete 26. Grooves 27 for sandwiching the tendon material 23 are formed on the opposing surfaces of the blocks 24 and 25. However, in this method, the processing of the blocks 24 and 25 is troublesome because the groove 27 needs to be processed to a size corresponding to the diameter of the tension material 23, and for example, the blocks 24 and 25 are sandwiched between the tension materials 23. The number of bolts to be tightened is about 8 to 12, the length of the blocks 24 and 25 is about 30 cm, and the mass may be about 25 kg. However, there is a problem that an electric tool is required and the work becomes difficult.
Japanese Examined Patent Publication No. 7-68771 Japanese Patent Laid-Open No. 3-183849 JP-A-4-16675

そこで、本発明は、軽量で締め付け作業も不要であって、１人での作業が可能となり、施工性に優れる緊張材の中間定着具および定着方法を提供することを目的とする。   Accordingly, an object of the present invention is to provide an intermediate fixing tool and a fixing method for a tension material that are lightweight and do not require a tightening operation, can be performed by one person, and are excellent in workability.

第１発明のＰＣ緊張材の中間定着具では、既設の連続したコンクリート構造物の中間部における解体・撤去区間に緊張状態のまま露出して残るＰＣ緊張材を定着するＰＣ緊張材の中間定着具において、
ＰＣ緊張材の周囲を所定の環状すきまを保って挟み込む半割りスリーブを合わせてなる筒状部材と、開口部を有し筒状部材の外周に順に嵌め込まれて筒状部材を補強する複数個の板状Ｃ形部材とを有し、前記板状Ｃ形部材は開口部を備え、筒状部材の全長に亘って外挿された状態で、隣接する板状Ｃ形部材の開口部が筒状部材の周方向にずれて配設されることを特徴とする。
In the intermediate fixing device for PC tension members according to the first aspect of the present invention, the intermediate fixing device for PC tension materials for fixing the PC tension materials that remain exposed in the dismantling / removal section in the intermediate portion of the existing continuous concrete structure. In
A tubular member formed by combining a half sleeve that sandwiches the periphery of the PC tendon material while maintaining a predetermined annular clearance, and a plurality of members that have openings and are sequentially fitted on the outer periphery of the tubular member to reinforce the tubular member have a plate-like C-shaped member, the plate-like C-shaped member is provided with an opening, in a state of being fitted over the entire length of the tubular member, the opening of the adjacent plate-like C-shaped member is cylindrical Disposed in the circumferential direction of the member .

第２発明では、第１発明のＰＣ緊張材の中間定着具において、筒状部材内の環状すきまに充填された膨張材の膨張圧により発生する摩擦力によってＰＣ緊張材を定着することを特徴とする。
According to a second aspect of the present invention, in the intermediate fixing device for the PC tendon material of the first invention, the PC tendon member is fixed by a frictional force generated by the expansion pressure of the expandable material filled in the annular clearance in the cylindrical member. To do.

第３発明のＰＣ緊張材の中間定着方法では、既設の連続したコンクリート構造物の中間部における解体・撤去区間に緊張状態のまま露出して残るＰＣ緊張材を定着するＰＣ緊張材の中間定着方法であって、請求項１又は２に記載の中間定着具を用い、前記緊張状態のまま露出して残るＰＣ緊張材の周囲に所定の環状すきまを保って挟み込む半割りスリーブを合わせるようにして筒状部材を配置し、開口部を有する複数の板状Ｃ形部材を筒状部材に外挿すると共に、隣接する板状Ｃ形部材を周方向にずらして配置した後、前記筒状部材内の環状すきまに膨張材を充填してＰＣ緊張材を定着することを特徴とする。
In the intermediate fixing method for PC tendons according to the third aspect of the invention, the PC tendon intermediate fixing method for fixing the PC tendons remaining exposed in a tension state in the dismantling / removal section of the intermediate portion of the existing continuous concrete structure. The intermediate fixing device according to claim 1 or 2 is used, and a half sleeve that is sandwiched with a predetermined annular clearance is fitted around the PC tension member that remains exposed in the tension state. After disposing a plurality of plate-like C-shaped members having openings and extrapolating the cylindrical members to the cylindrical member, and arranging the adjacent plate-like C-shaped members shifted in the circumferential direction, the inside of the tubular member An annular gap is filled with an expansion material to fix the PC tension material.

第１発明によると、ＰＣ緊張材を挟み込む半割の筒状部材と、筒状部材の外周に複数に分割されたＣ形部材を嵌め込む簡単な構造であるので、部材が軽量で１人での作業が可能となる。また、ボルト締めする必要も無いため施工性が非常に優れるという効果が得られる。   According to the first aspect of the present invention, it is a simple structure in which a half-cut cylindrical member that sandwiches a PC tendon and a C-shaped member divided into a plurality of outer peripheries of the cylindrical member is fitted. Work becomes possible. Moreover, since it is not necessary to bolt, the effect that workability is very excellent is acquired.

第１発明によると、Ｃ形部材が開口部を有するのでＰＣ緊張材に沿って嵌め込み易く、また、隣接するＣ形部材の開口部を筒状部材の周方向にずらすので、筒状部材の補強を効果的に行うことができる。
According to the first invention, since the C-shaped member has the opening, it is easy to fit along the PC tendon, and the opening of the adjacent C-shaped member is shifted in the circumferential direction of the cylindrical member, so that the cylindrical member is reinforced. Can be carried out effectively.

第２発明によると、ＰＣ緊張材を挟んだ筒状部材の外周にＣ形部材が嵌め込まれて補強しているので、膨張材の膨張圧によるＰＣ緊張材の定着が確実になされる。
According to the second invention, since the C-shaped member is fitted and reinforced on the outer periphery of the cylindrical member sandwiching the PC tendon material, the PC tendon material is reliably fixed by the expansion pressure of the expandable material.

第３発明によると、第１発明又は第２発明の中間定着具を用いてＰＣ緊張材を定着するので、各発明のいずれかによる効果が得られる。 According to a third invention, since the fixing of the PC tendon using between fixing member in the first or second aspect of the invention, effects can be obtained by any of the invention.

次に、本発明を図示の実施形態に基づいて詳細に説明する。本実施形態は、先に背景技術の項で述べた場合と同じく、連続したコンクリート構造物の一部区間を解体・撤去する工事に適用される場合を示す。   Next, the present invention will be described in detail based on the illustrated embodiment. This embodiment shows the case where it applies to the construction which demolishes and removes a part of a continuous concrete structure like the case described in the section of the background art.

図１は本実施形態の中間定着具１の取り付け完了状態における全体概要と各構成部材の概要を示す図である。（ａ）は取り付け完了状態の正面断面図、（ｂ）は構成部材の正面断面図と側面図、（ｃ）は構成部材それぞれの側面図である。   FIG. 1 is a diagram showing an overall outline and an outline of each component in a state where the intermediate fixing tool 1 of the present embodiment is completely attached. (A) is front sectional drawing of the completion state of attachment, (b) is front sectional drawing and a side view of a structural member, (c) is a side view of each structural member.

図２は取り付け完了状態の中間定着具１の外観図を示す。（ａ）は正面図、（ｂ）は側面図、（ｃ）は構成部材の側面図である。   FIG. 2 is an external view of the intermediate fixing device 1 in a state where the attachment is completed. (A) is a front view, (b) is a side view, and (c) is a side view of components.

図１に示すように、中間定着具１は、つぎの部材から構成される。すなわち芯部に配設される所定長さの半割りスリーブ２ａを合わせてなる筒状部材としての鋼管スリーブ２、その外周に嵌め込まれる複数個の板状Ｃ形部材としてのＣ形スリーブ４（図２ａ参照）、鋼管スリーブ２の両端にそれぞれ配設される半割りの密閉用鋼板３とから構成される。
2個の半割りスリーブ２ａは、取り付け時に貼り合わされ、鋼管スリーブ２はパイプ状を呈する。鋼管スリーブ２の端部には図２（ａ）に示すように、それぞれ膨張材（後述）注入孔５と空気排出孔６が、鋼管スリーブ２の壁に設けられている。
Ｃ形スリーブ４は、Ｃ字形に形成された所定厚さの鋼板からなり、複数個用いられる。Ｃ字形の開口部４ａは取り付け用に設けられたものである。前記のＣ形スリーブ４の開孔部４ａのスリット幅は、ＰＣ鋼材７の直径寸法よりも大きく、鋼管スリーブ２の外径よりも小さくされている。 As shown in FIG. 1, the intermediate fixing tool 1 includes the following members. That is, a steel pipe sleeve 2 as a tubular member formed by combining a half sleeve 2a having a predetermined length disposed in the core portion, and a C-shaped sleeve 4 as a plurality of plate-like C-shaped members fitted on the outer periphery thereof (FIG. 2a), and a steel plate 3 for half-sealing disposed on both ends of the steel pipe sleeve 2, respectively.
The two half sleeves 2a are bonded together at the time of attachment, and the steel pipe sleeve 2 has a pipe shape. As shown in FIG. 2A, an expansion material (described later) injection hole 5 and an air discharge hole 6 are provided on the wall of the steel pipe sleeve 2 at the end of the steel pipe sleeve 2.
The C-shaped sleeve 4 is made of a steel plate having a predetermined thickness formed in a C-shape, and a plurality of the C-shaped sleeves 4 are used. The C-shaped opening 4a is provided for attachment. The slit width of the opening 4 a of the C-shaped sleeve 4 is larger than the diameter of the PC steel material 7 and smaller than the outer diameter of the steel pipe sleeve 2.

中間定着具１を取り付ける前に、工事現場では、シースおよびＰＣ緊張材としてのＰＣ鋼材７の周りを、工具を使用してあるいは手はつりで除去し、ＰＣ鋼材７を露出させる。ＰＣ鋼材７の表面に付着しているグラウト等を取り除き、後述する膨張材の付着性能を高める。   Before the intermediate fixing device 1 is attached, at the construction site, the PC steel material 7 around the PC steel material 7 as the sheath and the PC tension material is removed using a tool or by hand to expose the PC steel material 7. The grout etc. adhering to the surface of the PC steel material 7 are removed, and the adhesion performance of the expansion material described later is enhanced.

図３は中間定着具１の取り付け状況を示す説明図である。工事現場において上記の構成部材を順次取り付けていって中間定着具１が構成される。すなわち、露出しているＰＣ鋼材７の周囲に、図３に示す鋼管スリーブ２の半割りスリーブ２ａを配置し、矢印Ｂで示すようにＰＣ鋼材７を挟んで合わせ、合わせ目に止水用両面テープ８を貼る。鋼管スリーブ２の内周とＰＣ鋼材７との間には所定の径方向隙間が確保される。鋼管スリーブ２の両端の凹部に半割りの密閉用鋼板３を適宜取り付ける。前記密閉用鋼鈑３の内面あるいは外面には、適宜漏洩防止ゴム材が設けられて、ＰＣ鋼材７と鋼製スリ−ブ２との間から膨脹材の漏洩を防止するようにしている。こうして、ＰＣ鋼材７と中間定着具１（鋼管スリーブ２）との間に密閉状の環状すきまとしての空間部９が形成される。   FIG. 3 is an explanatory view showing a state of attachment of the intermediate fixing tool 1. The intermediate fixing device 1 is configured by sequentially attaching the above-described components at the construction site. That is, the half sleeve 2a of the steel pipe sleeve 2 shown in FIG. 3 is arranged around the exposed PC steel material 7, and the PC steel material 7 is sandwiched and aligned as shown by an arrow B. A tape 8 is applied. A predetermined radial clearance is secured between the inner periphery of the steel pipe sleeve 2 and the PC steel material 7. The half-sealing steel plate 3 is attached to the recesses at both ends of the steel tube sleeve 2 as appropriate. A leakage preventing rubber material is appropriately provided on the inner surface or the outer surface of the sealing steel plate 3 to prevent leakage of the expansion material from between the PC steel material 7 and the steel sleeve 2. Thus, a space portion 9 is formed as a sealed annular gap between the PC steel material 7 and the intermediate fixing tool 1 (steel pipe sleeve 2).

ついで、図３に矢印Ａで示すようにＣ形スリーブ４をＰＣ鋼材７に外挿し、それに沿って移動させて１個ずつ順に鋼管スリーブ２上にはめ込む。このとき隣接するＣ形スリーブ４の開口部４ａを周方向に１８０度ずらせてはめ込む。このとき、両端に配置されたＣ形スリーブ４の開口部４ａに、鋼管スリーブ２の端部に設けられた注入孔５と排出孔６が、通じるようにＣ形スリーブ４を配設する。そして、中間定着具１と継続使用する構造物の端部１２との間に、スリット付支圧板１０あるいは半割り支圧板１０等を隙間無く取り付ける。   Next, as indicated by an arrow A in FIG. 3, the C-shaped sleeve 4 is extrapolated to the PC steel material 7, moved along the PC steel material 7, and fitted into the steel tube sleeve 2 one by one in order. At this time, the opening 4a of the adjacent C-shaped sleeve 4 is fitted by being shifted by 180 degrees in the circumferential direction. At this time, the C-shaped sleeve 4 is disposed so that the injection hole 5 and the discharge hole 6 provided at the end of the steel pipe sleeve 2 communicate with the openings 4a of the C-shaped sleeve 4 disposed at both ends. Then, between the intermediate fixing tool 1 and the end portion 12 of the structure to be used continuously, the support plate 10 with slits or the half support plate 10 is attached without any gap.

この状態で注入孔５から空間部９に膨張材１１を注入する。膨張材１１が空気排出孔６から排出された段階で注入を完了する。膨張材１１の硬化膨張によって発生する高膨張圧によってＰＣ鋼材７が強固に定着される。解体・撤去部分の反対側についても同じ方法で中間定着具１を取り付ける。
そして、最後に解体・撤去部分のＰＣ鋼材７を切断する。こうして、残存する部分のＰＣ鋼材７は中間定着具１により緊張力が保持された状態で定着される。 In this state, the expansion material 11 is injected from the injection hole 5 into the space 9. The injection is completed when the inflatable material 11 is discharged from the air discharge hole 6. The PC steel material 7 is firmly fixed by the high expansion pressure generated by the hardening expansion of the expansion material 11. The intermediate fixing device 1 is attached in the same manner on the opposite side of the dismantling / removal part.
Finally, the PC steel material 7 at the dismantling / removal part is cut. In this way, the remaining portion of the PC steel material 7 is fixed by the intermediate fixing tool 1 while the tension is maintained.

（ａ）は取り付け完了状態の正面断面図、（ｂ）は構成部材の正面断面図と側面図、（ｃ）は構成部材それぞれの側面図である。(A) is front sectional drawing of the completion state of attachment, (b) is front sectional drawing and a side view of a structural member, (c) is a side view of each structural member. （ａ）は正面図、（ｂ）は側面図、（ｃ）は構成部材の側面図である。(A) is a front view, (b) is a side view, and (c) is a side view of components. 中間定着具の取り付け状況を示す説明図である。FIG. 6 is an explanatory diagram showing an attachment state of an intermediate fixing tool. 既設の連続したコンクリート構造物の一部区間を解体・撤去する背景技術の一例を示す説明図である。It is explanatory drawing which shows an example of the background art which demolishes and removes a part of existing continuous concrete structure. （ａ）はコンクリート構造物端部の側面図、（ｂ）はブロック式中間定着具、（ｃ）はボルト締め付け前のＣ矢視図である。(A) is a side view of the end of a concrete structure, (b) is a block-type intermediate fixing tool, and (c) is a view as viewed from the arrow C before bolt tightening.

符号の説明Explanation of symbols

１ 中間定着具
２ 鋼管スリーブ (筒状部材)
２ａ 半割りスリーブ
３ 密閉用鋼板
４ Ｃ形スリーブ(Ｃ形部材)
４ａ Ｃ形スリーブの開口部
５ 膨張材注入孔
６ 空気排出孔
７ ＰＣ鋼材(ＰＣ緊張材)
８ 止水用両面テープ
９ 空間部(環状すきま)
１０ 支圧板等
１１ 膨張材
１２ 構造物の端部
２１ 連続したコンクリート構造物
２２ 解体・撤去部
２３ 緊張材
２４、２５ 鋼製ブロック
２６ コンクリート
２７ 溝 1 Intermediate fixing tool 2 Steel pipe sleeve (tubular member)
2a Half sleeve 3 Steel plate for sealing 4 C-shaped sleeve (C-shaped member)
4a C-shaped sleeve opening 5 Expansion material injection hole 6 Air discharge hole 7 PC steel (PC tension material)
8 Double-sided adhesive tape for water stop 9 Space (annular clearance)
DESCRIPTION OF SYMBOLS 10 Bearing plate etc. 11 Expansion material 12 End of structure 21 Continuous concrete structure 22 Dismantling and removal part 23 Tension material 24, 25 Steel block 26 Concrete 27 Groove

Claims (3)

既設の連続したコンクリート構造物の中間部における解体・撤去区間に緊張状態のまま露出して残るＰＣ緊張材を定着するＰＣ緊張材の中間定着具において、
ＰＣ緊張材の周囲を所定の環状すきまを保って挟み込む半割りスリーブを合わせてなる筒状部材と、開口部を有し筒状部材の外周に順に嵌め込まれて筒状部材を補強する複数個の板状Ｃ形部材とを有し、前記板状Ｃ形部材は開口部を備え、筒状部材の全長に亘って外挿された状態で、隣接する板状Ｃ形部材の開口部が筒状部材の周方向にずれて配設されることを特徴とするＰＣ緊張材の中間定着具。 In the intermediate fixing tool for PC tendons that fix the PC tendons that remain exposed in the dismantling / removal section in the middle of the existing continuous concrete structure,
A tubular member formed by combining a half sleeve that sandwiches the periphery of the PC tendon material while maintaining a predetermined annular clearance, and a plurality of members that have openings and are sequentially fitted on the outer periphery of the tubular member to reinforce the tubular member have a plate-like C-shaped member, the plate-like C-shaped member is provided with an opening, in a state of being fitted over the entire length of the tubular member, the opening of the adjacent plate-like C-shaped member is cylindrical An intermediate fixing tool for PC tendons, which is arranged so as to be shifted in the circumferential direction of the member. 請求項１に記載のＰＣ緊張材の中間定着具において、
前記筒状部材内の環状すきまに充填された膨張材の膨張圧により発生する摩擦力によってＰＣ緊張材を定着することを特徴とするＰＣ緊張材の中間定着具。 In the intermediate fixing tool of the PC tendon according to claim 1,
An intermediate fixing device for a PC tension member, wherein the PC tension member is fixed by a frictional force generated by an expansion pressure of the expansion member filled in the annular gap in the cylindrical member. 既設の連続したコンクリート構造物の中間部における解体・撤去区間に緊張状態のまま露出して残るＰＣ緊張材を定着するＰＣ緊張材の中間定着方法であって、請求項１又は２に記載の中間定着具を用い、前記緊張状態のまま露出して残るＰＣ緊張材の周囲に所定の環状すきまを保って挟み込む半割りスリーブを合わせるようにして筒状部材を配置し、開口部を有する複数の板状Ｃ形部材を筒状部材に外挿すると共に、隣接する板状Ｃ形部材を周方向にずらして配置した後、前記筒状部材内の環状すきまに膨張材を充填してＰＣ緊張材を定着することを特徴とするＰＣ緊張材の中間定着方法。 An intermediate fixing method for a PC tendon which fixes a PC tendon remaining exposed in a tension state in a dismantling / removal section in an intermediate portion of an existing continuous concrete structure, comprising the intermediate according to claim 1 or 2 A plurality of plates each having an opening, wherein a cylindrical member is arranged using a fixing tool so as to match a half sleeve that is sandwiched with a predetermined annular clearance around a PC tension member that remains exposed in the tension state. The C-shaped member is extrapolated to the cylindrical member, and the adjacent plate-shaped C-shaped members are shifted in the circumferential direction. An intermediate fixing method of a PC tendon material, characterized by fixing.
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