JP4330722B2 - Joint structure - Google Patents

Joint structure Download PDF

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Publication number
JP4330722B2
JP4330722B2 JP26123799A JP26123799A JP4330722B2 JP 4330722 B2 JP4330722 B2 JP 4330722B2 JP 26123799 A JP26123799 A JP 26123799A JP 26123799 A JP26123799 A JP 26123799A JP 4330722 B2 JP4330722 B2 JP 4330722B2
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JP
Japan
Prior art keywords
joint
rod
female
fitting
locking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP26123799A
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Japanese (ja)
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JP2001082084A (en
Inventor
俊司 羽鳥
政則 川村
勝利 栗本
晃洋 峯崎
利雄 望月
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobayashi Industry Co Ltd
Tobishima Corp
Original Assignee
Kobayashi Industry Co Ltd
Tobishima Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobayashi Industry Co Ltd, Tobishima Corp filed Critical Kobayashi Industry Co Ltd
Priority to JP26123799A priority Critical patent/JP4330722B2/en
Publication of JP2001082084A publication Critical patent/JP2001082084A/en
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Publication of JP4330722B2 publication Critical patent/JP4330722B2/en
Anticipated expiration legal-status Critical
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Description

【0001】
【発明の属する技術分野】
この発明は、トンネル等を構成するセグメント同士の接合箇所に適用される継手構造に関するものである。
【0002】
【従来の技術】
トンネル等を構成するセグメント同士を接合させる構造としては、例えば、セグメントの互いの接合端面に、セグメントの接合端面同士を当接した際に互いに連通するボルト挿通孔が形成された継手板を埋め込んでおき、この継手板の互いに連通されたボルト挿通孔へボルトを挿通してナットを螺合させることにより、これらセグメント同士を接合させる構造が一般的である。
【0003】
【発明が解決しようとする課題】
しかしながら、上記の構造では、その接合作業が極めて煩雑であるので、現場にて多大な労力がかかるとともに、工期の長期化を招いてしまうという問題があった。
しかも、上記構造の場合、ボルト・ナットを取り付けるためのボルトボックスがセグメント内面に必要であり、したがって、セグメントの組み付け後に、それぞれのセグメントのボルトボックスを充填材等を充填して埋めなければならず、その作業にも多大な労力を要していた。
【0004】
この発明は、上記事情に鑑みてなされたもので、煩雑な作業を行うことなく、極めて容易に部材同士を接合させることができ、工期の短縮化を図ることが可能な継手構造を提供することを目的としている。
【0005】
【課題を解決するための手段】
上記目的を達成するために、請求項1記載の継手構造は、雌型継手金具に雄型継手金具を係止させることにより、これら雄型継手金具及び雌型継手金具が設けられた部材同士を接合する継手構造であって、前記雄型継手金具は前記部材の接合端面から突出する接合棒を有し、前記雌型継手金具は前記接合棒が挿入されることにより該接合棒を係止する雌型継手本体を有してなり、前記雄型継手金具の接合棒はその後端側が先端部よりも小径のくびれ部とされ、前記雌型継手金具の雌型継手本体は前記接合棒が挿入されるハウジングを有し、このハウジング内にて、前記接合棒の挿入方向と略直交する方向へスライド可能であって前記接合棒が挿入可能な係止孔を有していて前記接合棒の挿入方向にずれて配設された2枚の係止板と、これら係止板を前記係止孔の中心が前記接合棒の挿入軸線から外れる位置であってそれぞれ逆方向へ付勢する付勢部材とを有してなり、
前記2枚の係止板は前記付勢部材によって付勢されその係止孔の開口縁の一部が、挿入された前記接合棒のくびれ部へそれぞれ入り込んで逆方向から係止することを特徴としている。
【0006】
このように、雌型継手金具へ雄型継手金具の接合棒を挿入することにより、極めて容易に、接合棒のくびれ部へ雌型継手金具に設けられた係止板の係止孔の開口縁の一部を係止させて、これら雄型継手金具と雌型継手金具とを接合させ、部材同士を互いに接合させることができる。
これにより、現場における労力を大幅に低減させることができ、工期の短期化を図ることができる。
また、ボルト・ナットによる継手構造にて必要であったボルトボックスをなくすことができ、これにより、組み付け後におけるボルトボックスの閉塞作業を省くことができる。
しかも、複数枚の係止板によって接合棒を係止することができるので、さらに大きな係止力によって確実に接合させることができる。
【0009】
【発明の実施の形態】
以下、本発明の継手構造の実施の形態例を図によって説明する。
図1から図3において、符号1は、継手金具である。この継手金具1は、トンネルの覆工体を構成するセグメント(部材)Sにそれぞれ設けられた雄型継手金具2と雌型継手金具3とから構成されている。これら雄型継手金具2及び雌型継手金具3が設けられたセグメントSは、その接合端面4を構成する主桁板5と図示しない継手板とから構成された枠体の外周側にスキンプレート6が設けられ、枠体内にコンクリートCが充填された構造となっている。
【0010】
雄型継手金具2は、前記主桁板5に固定された接合棒11を有するもので、主桁板5には、孔部12が形成され、その裏面側には、袋ナット13が溶接固定されている。
接合棒11は、その後端部におねじが形成された棒体からなるもので、主桁板5の孔部12へ挿通し、袋ナット13へねじ込むことにより、主桁板5に固定されている。この接合棒11は、その先端部が球面状に形成された球面部14とされており、この球面部14よりも後端側は、球面部14よりも小径のくびれ部15とされている。
【0011】
雌型継手金具3は、主桁板5の裏側に固定された雌型継手本体21からなるもので、主桁板5に形成された挿入孔22から挿入される雄型継手金具2の接合棒11を係止するようになっている。
【0012】
雌型継手本体21は、ハウジング23と、このハウジング23の開口側に取り付けられたカバー24と、ハウジング23内に配設された複数の係止板25と、これら係止板25のそれぞれの一方の端部側に設けられた、バネ鋼等からなる付勢部材26とを有している。なお、この付勢部材26としては、バネ鋼に限らず、例えば、ゴム、ウレタンゴム等様々なものが使用可能である。
ハウジング23に取り付けられたカバー24には、その中心に、前記挿入孔22と連通する挿通孔24aが形成されており、この挿通孔24aから前記雄型継手金具2の接合棒11が雌型継手本体21内に挿入されるようになっている。
【0013】
ハウジング23は、カバー24が取り付けられた開口側が幅広に形成された保持空間27とされ、奥側が保持空間27よりも狭い小幅空間28とされている。そして、このハウジング23の保持空間27に、前記係止板25が保持されている。
係止板25には、前記接合棒11が挿入可能な係止孔29が形成されており、それぞれの係止板25は、ハウジング23の保持空間27に、接合棒11の挿入方向と略直交する方向へスライド可能に保持されている。これら係止板25は、前記付勢部材26によってそれぞれ異なる方向(ここでは互いに逆方向)へかつ係止板25に形成された係止孔29の中心が接合棒11の挿入軸線から外れる位置へ付勢されている。
【0014】
次に、上記構造の継手金具1を構成する雄型継手金具2及び雌型継手金具3を互いに接合させてセグメントS同士を接合させる場合について説明する。
これら雄型継手金具2及び雌型継手金具3を互いに接合させる場合は、雌型継手金具3側のセグメントSの主桁板5に形成された挿入孔22から雌型継手本体21のカバー24に形成された挿通孔24aへ、雄型継手金具2の接合棒11を挿入する。このようにすると、この雄型継手金具2の接合棒11の球面部14が、雌型継手金具3のハウジング23の保持空間27内に保持されている係止板25の係止孔29内へ入り込む。
【0015】
ここで、これら係止板25は、付勢部材26によって、それぞれ異なる方向へ付勢されてその係止孔29の中心が、接合棒11の挿入軸線から外されているが、これら係止板25の係止孔29内へ接合棒11の球面部14が入り込むことにより、それぞれの係止板25は、付勢部材26の付勢力に抗してスライドされる。これにより、これら係止板25の係止孔29内に接合棒11が挿入される。
【0016】
その後、雄型継手金具2の接合棒11の球面部14が、それぞれの係止板25の保持空間27での軸方向の保持位置を越えると、接合棒11の球面部14によって付勢部材26の付勢力に抗してスライドされていた係止板25が、付勢部材26によって再び付勢方向へ押圧され、これにより、これら係止板25の係止孔29の開口縁の一部が接合棒11のくびれ部15側へ入り込む。
これにより、図4及び図5に示すように、接合棒11は、それぞれの係止板25によって係止されて、後端側への移動が禁止され、雄型継手金具2と雌型継手金具3とが互いに接合された状態となり、これら雄型継手金具2及び雌型継手金具3が設けられた各セグメントSが互いに接合される。
【0017】
以上、説明したように、上記の継手構造によれば、雌型継手金具3へ雄型継手金具2の接合棒11を挿入することにより、極めて容易に、接合棒11のくびれ部15へ雌型継手金具3に設けられた係止板25の係止孔29の開口縁の一部を係止させて、これら雄型継手金具2と雌型継手金具3とを接合させ、セグメントS同士を互いに接合させることができる。
これにより、現場における労力を大幅に低減させることができ、工期の短期化を図ることができる。
【0018】
また、ボルト・ナットによる継手構造にて必要であったボルトボックスをなくすことができ、これにより、組み付け後におけるボルトボックスの閉塞作業を省くことができる。
なお、上記の例では、2枚の係止板25を設けたが、これら係止板25の数は、2枚に限定されることはない。
【0019】
【発明の効果】
以上、説明したように、本発明の継手構造によれば、下記の効果を得ることができる。請求項1記載の継手構造によれば、雌型継手金具へ雄型継手金具の接合棒を挿入することにより、極めて容易に、接合棒のくびれ部へ雌型継手金具に設けられた係止板の係止孔の開口縁の一部を係止させて、これら雄型継手金具と雌型継手金具とを接合させ、部材同士を互いに接合させることができる。これにより、現場における労力を大幅に低減させることができ、工期の短期化を図ることができる。また、ボルト・ナットによる継手構造にて必要であったボルトボックスをなくすことができ、これにより、組み付け後におけるボルトボックスの閉塞作業を省くことができる。
しかも、2枚の係止板によって接合棒を逆方向から係止することができるので、大きな係止力によって確実に接合させることができる。
【図面の簡単な説明】
【図1】 本発明の実施の形態の継手構造を説明する互いに接合される雄型継手金具及び雌型継手金具を有するセグメントの横断面図である。
【図2】 本発明の実施の形態の継手構造を説明する互いに接合される雄型継手金具及び雌型継手金具を有するセグメントの側断面図である。
【図3】 本発明の実施の形態の継手構造を説明する雌型継手金具が設けられたセグメントの平断面図である。
【図4】 本発明の実施の形態の継手構造を説明する互いに接合された雄型継手金具及び雌型継手金具を有するセグメントの横断面図である。
【図5】 本発明の実施の形態の継手構造を説明する雄型継手金具を係止した雌型継手金具が設けられたセグメントの平断面図である。
【符号の説明】
2 雄型継手金具
3 雌型継手金具
4 接合端面
11 接合棒
15 くびれ部
21 雌型継手本体
23 ハウジング
25 係止板
26 付勢部材
29 係止孔
S セグメント(部材)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure applied to a joint portion between segments constituting a tunnel or the like.
[0002]
[Prior art]
As a structure for joining the segments constituting a tunnel or the like, for example, a joint plate in which bolt insertion holes that communicate with each other when the joining end surfaces of the segments are brought into contact with each other is embedded in the joining end surfaces of the segments. In addition, a structure in which these segments are joined by inserting a bolt into a bolt insertion hole that is communicated with each other and screwing a nut into the joint plate is generally used.
[0003]
[Problems to be solved by the invention]
However, in the above structure, since the joining work is extremely complicated, there is a problem that a great deal of labor is required on site and that the construction period is prolonged.
Moreover, in the case of the above structure, a bolt box for attaching bolts and nuts is required on the inner surface of the segment. Therefore, after assembling the segments, the bolt boxes of each segment must be filled with a filler or the like. The work required a great deal of effort.
[0004]
The present invention has been made in view of the above circumstances, and provides a joint structure capable of joining members extremely easily without performing complicated work and capable of shortening the construction period. It is an object.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the joint structure according to claim 1 is configured such that the male joint fitting and the female joint fitting are connected to each other by locking the male joint fitting to the female joint fitting. a joint structure for joining, the male joint fitting has a joint rod which projects from the joint edge of the front SL member, the female coupling fittings Ri該 junction rod by the fact that the pre-Symbol junction rods are inserted becomes a female fitting body for locking the rear end side of the junction rod Waso of the male joint fitting is a small-diameter constricted portion than the previous end, the female fitting of the female joint fittings the body has a housing to be inserted before Symbol junction rod at the housing, have a possible locking hole inserting said joined rod a slidable in the insertion direction a direction substantially perpendicular of the joint rod two and locking plate which is disposed displaced in the insertion direction of the joint rod has, these engagement It and a biasing member for the plate the center of the locking hole biases the position a was in opposite directions deviating from the axis of insertion of the joining rod,
The two engaging plate is biased by pre-Symbol urging member, a part of the opening edge of the locking hole is to lock the reverse enters each to constricted portions of the inserted said joining rod It is characterized by.
[0006]
Thus, by inserting the joint rod of the male joint fitting into the female joint fitting, the opening edge of the locking hole of the locking plate provided in the female joint fitting to the constricted portion of the joining rod is very easily achieved. These male joint fittings and female joint fittings can be joined by locking a part of them, and the members can be joined together.
Thereby, the labor on site can be reduced significantly and the construction period can be shortened.
In addition, the bolt box which is necessary in the joint structure using bolts and nuts can be eliminated, and thus the work of closing the bolt box after assembly can be omitted.
In addition, since the joining rod can be locked by a plurality of locking plates, it can be reliably bonded by a larger locking force.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the joint structure of the present invention will be described with reference to the drawings.
1 to 3, reference numeral 1 denotes a joint fitting. The joint fitting 1 is composed of a male joint fitting 2 and a female joint fitting 3 provided in segments (members) S constituting a tunnel covering body. The segment S provided with the male joint fitting 2 and the female joint fitting 3 has a skin plate 6 on the outer peripheral side of a frame constituted by a main girder plate 5 constituting the joining end face 4 and a joint plate (not shown). Is provided, and the frame body is filled with concrete C.
[0010]
The male joint fitting 2 has a joining rod 11 fixed to the main girder plate 5. A hole 12 is formed in the main girder plate 5, and a cap nut 13 is fixed by welding on the back side thereof. Has been.
The joining rod 11 is composed of a rod body having a screw formed at the rear end thereof, and is fixed to the main girder plate 5 by being inserted into the hole 12 of the main girder plate 5 and screwed into the cap nut 13. Yes. The joining rod 11 has a spherical portion 14 whose tip is formed in a spherical shape, and a rear end side of the spherical portion 14 is a constricted portion 15 having a smaller diameter than the spherical portion 14.
[0011]
The female joint fitting 3 is composed of a female joint main body 21 fixed to the back side of the main girder plate 5, and a joining rod of the male joint fitting 2 inserted from the insertion hole 22 formed in the main girder plate 5. 11 is locked.
[0012]
The female joint body 21 includes a housing 23, a cover 24 attached to the opening side of the housing 23, a plurality of locking plates 25 disposed in the housing 23, and one of each of the locking plates 25. And an urging member 26 made of spring steel or the like. The urging member 26 is not limited to spring steel, and various members such as rubber and urethane rubber can be used.
The cover 24 attached to the housing 23 is formed with an insertion hole 24a communicating with the insertion hole 22 at the center thereof, and the connecting rod 11 of the male fitting 2 is connected to the female fitting through the insertion hole 24a. It is inserted into the main body 21.
[0013]
The housing 23 has a holding space 27 having a wide opening on the opening side to which the cover 24 is attached, and a narrow space 28 narrower than the holding space 27 on the back side. The locking plate 25 is held in the holding space 27 of the housing 23.
A locking hole 29 into which the joining rod 11 can be inserted is formed in the locking plate 25, and each locking plate 25 is substantially orthogonal to the insertion direction of the joining rod 11 in the holding space 27 of the housing 23. It is held so as to be slidable in the direction. These locking plates 25 are moved in different directions by the urging members 26 (here, opposite to each other) and to a position where the center of the locking hole 29 formed in the locking plate 25 deviates from the insertion axis of the joining rod 11. It is energized.
[0014]
Next, the case where the male joint fitting 2 and the female joint fitting 3 constituting the joint fitting 1 having the above structure are joined to each other and the segments S are joined together will be described.
When the male joint fitting 2 and the female joint fitting 3 are joined together, the insertion hole 22 formed in the main girder plate 5 of the segment S on the female joint fitting 3 side is connected to the cover 24 of the female joint body 21. The joining rod 11 of the male fitting 2 is inserted into the formed insertion hole 24a. In this way, the spherical surface portion 14 of the joining rod 11 of the male joint fitting 2 enters the engagement hole 29 of the engagement plate 25 held in the holding space 27 of the housing 23 of the female joint fitting 3. Get in.
[0015]
Here, the locking plates 25 are urged in different directions by the urging members 26, and the centers of the locking holes 29 are removed from the insertion axis of the joining rod 11. When the spherical surface portion 14 of the joining rod 11 enters into the 25 locking holes 29, each locking plate 25 is slid against the urging force of the urging member 26. Thereby, the joining rod 11 is inserted into the locking holes 29 of the locking plates 25.
[0016]
Thereafter, when the spherical portion 14 of the joining rod 11 of the male joint fitting 2 exceeds the holding position in the axial direction in the holding space 27 of each locking plate 25, the biasing member 26 is applied by the spherical portion 14 of the joining rod 11. The latching plate 25 that has been slid against the urging force is pressed again in the urging direction by the urging member 26, whereby a part of the opening edge of the latching hole 29 of the latching plate 25 is formed. The joint rod 11 enters the constricted portion 15 side.
As a result, as shown in FIGS. 4 and 5, the joining rod 11 is locked by the respective locking plates 25, and movement to the rear end side is prohibited, and the male joint fitting 2 and the female joint fitting are prohibited. 3 are joined to each other, and the segments S provided with the male joint fitting 2 and the female joint fitting 3 are joined to each other.
[0017]
As described above, according to the joint structure described above, by inserting the joining rod 11 of the male joint fitting 2 into the female fitting 3, the female die can be inserted into the constricted portion 15 of the joining rod 11 very easily. A part of the opening edge of the locking hole 29 of the locking plate 25 provided in the joint fitting 3 is latched, the male joint fitting 2 and the female joint fitting 3 are joined, and the segments S are mutually connected. Can be joined.
Thereby, the labor on site can be reduced significantly and the construction period can be shortened.
[0018]
In addition, the bolt box which is necessary in the joint structure using bolts and nuts can be eliminated, and thus the work of closing the bolt box after assembly can be omitted.
In the above example, two locking plates 25 are provided. However, the number of the locking plates 25 is not limited to two.
[0019]
【The invention's effect】
As described above, according to the joint structure of the present invention, the following effects can be obtained. According to the joint structure of claim 1, the locking plate provided on the female joint fitting to the constricted portion of the joining rod is very easily achieved by inserting the joint rod of the male joint fitting into the female joint fitting. A part of the opening edge of the locking hole can be locked, the male joint fitting and the female joint fitting can be joined, and the members can be joined together. Thereby, the labor on site can be reduced significantly and the construction period can be shortened. In addition, the bolt box which is necessary in the joint structure using bolts and nuts can be eliminated, and thus the work of closing the bolt box after assembly can be omitted.
Moreover, since the joining rod can be locked from the opposite direction by the two locking plates, it can be reliably bonded by a large locking force.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a segment having a male joint fitting and a female joint fitting to be joined to each other for explaining a joint structure according to an embodiment of the present invention.
FIG. 2 is a side sectional view of a segment having a male joint fitting and a female joint fitting to be joined to each other for explaining a joint structure according to an embodiment of the present invention.
FIG. 3 is a plan sectional view of a segment provided with a female joint fitting for explaining a joint structure according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a segment having a male joint fitting and a female joint fitting joined to each other for explaining a joint structure according to an embodiment of the present invention.
FIG. 5 is a cross-sectional plan view of a segment provided with a female joint fitting for locking a male joint fitting for explaining a joint structure according to an embodiment of the present invention.
[Explanation of symbols]
2 male joint fitting 3 female joint fitting 4 joint end face 11 joint rod 15 constricted portion 21 female joint body 23 housing 25 locking plate 26 urging member 29 locking hole S segment (member)

Claims (1)

雌型継手金具に雄型継手金具を係止させることにより、これら雄型継手金具及び雌型継手金具が設けられた部材同士を接合する継手構造であって、
前記雄型継手金具は前記部材の接合端面から突出する接合棒を有し、前記雌型継手金具は前記接合棒が挿入されることにより該接合棒を係止する雌型継手本体を有してなり、
前記雄型継手金具の接合棒はその後端側が先端部よりも小径のくびれ部とされ、前記雌型継手金具の雌型継手本体は前記接合棒が挿入されるハウジングを有し
このハウジング内にて、前記接合棒の挿入方向と略直交する方向へスライド可能であって前記接合棒が挿入可能な係止孔を有していて前記接合棒の挿入方向にずれて配設された2枚の係止板と、これら係止板を前記係止孔の中心が前記接合棒の挿入軸線から外れる位置であってそれぞれ逆方向へ付勢する付勢部材とを有してなり、
前記2枚の係止板は前記付勢部材によって付勢されその係止孔の開口縁の一部が、挿入された前記接合棒のくびれ部へそれぞれ入り込んで逆方向から係止することを特徴とする継手構造。
By engaging the male joint bracket with the female joint bracket, a joint structure for joining the members provided with the male joint bracket and the female joint bracket,
The male joint fitting has a joint rod which projects from the joint edge of the front SL member, the female coupling body the female joint fitting for locking by Ri該 joint rod that is pre-Symbol junction rods are inserted Having
The rear end side of the junction rod Waso male joint fitting is a small-diameter constricted portion than the previous end, the female fitting body of the female joint fitting has a housing to be inserted before Symbol junction rod ,
Within this housing, the joint bar a slidable is disposed displaced in the insertion direction of the joint bars have have a possible insertion locking hole in the insertion direction a direction substantially perpendicular of the joint rod and the two locking plates, it has a biasing member these locking plate the center of the locking hole for urging to a position at a in opposite directions deviating from the axis of insertion of the joining rod,
The two engaging plate is biased by pre-Symbol urging member, a part of the opening edge of the locking hole is to lock the reverse enters each to constricted portions of the inserted said joining rod A joint structure characterized by
JP26123799A 1999-09-14 1999-09-14 Joint structure Expired - Fee Related JP4330722B2 (en)

Priority Applications (1)

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JP26123799A JP4330722B2 (en) 1999-09-14 1999-09-14 Joint structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26123799A JP4330722B2 (en) 1999-09-14 1999-09-14 Joint structure

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JP2001082084A JP2001082084A (en) 2001-03-27
JP4330722B2 true JP4330722B2 (en) 2009-09-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106437755A (en) * 2016-09-08 2017-02-22 中国神华能源股份有限公司 Pipe section flexible joint and installation method thereof

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4083466B2 (en) * 2002-05-17 2008-04-30 石川島建材工業株式会社 Fitting
JP4951438B2 (en) * 2007-08-01 2012-06-13 石川島建材工業株式会社 Joint structure
FI127402B (en) 2015-09-14 2018-05-15 Mincon Nordic Oy Drilling device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106437755A (en) * 2016-09-08 2017-02-22 中国神华能源股份有限公司 Pipe section flexible joint and installation method thereof

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