JP2018204403A - Jack cover - Google Patents

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JP2018204403A
JP2018204403A JP2017114260A JP2017114260A JP2018204403A JP 2018204403 A JP2018204403 A JP 2018204403A JP 2017114260 A JP2017114260 A JP 2017114260A JP 2017114260 A JP2017114260 A JP 2017114260A JP 2018204403 A JP2018204403 A JP 2018204403A
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cover
jack
base portion
jack cover
base part
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JP6670799B2 (en
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範夫 藤田
Norio Fujita
範夫 藤田
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Hirose Holdings and Co Ltd
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Hirose Holdings and Co Ltd
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Abstract

To provide a jack cover with an excellent function of preventing deformation of a jack, which includes a function of adjusting an inner space dimension vertically.SOLUTION: The jack cover of the present invention is a jack cover protecting a jack that interposes between two strut materials supporting lateral pressure of earth-retaining walls facing each other in an earth-retaining structure, the jack cover comprising an upper cover and a lower cover. The upper cover has an upper base part whose bottom surface contacts the upper surfaces of the two strut materials, and upper side parts extending downward from both sides of the upper base part. The lower cover has a lower base part whose upper surface contacts the bottom surfaces of the two strut materials, and lower side parts extending upward from both sides of the lower base part. An inner space dimension in the vertical direction is defined between the bottom surface of the upper base part and the upper surface of the lower base part, and it is possible to adjust the inner space dimension in the vertical direction by fastening the upper side parts and the lower side parts with fastenings.SELECTED DRAWING: Figure 1

Description

本発明は、ジャッキカバーに関し、特に切梁材の長さ調整ジャッキにおいて、鉛直方向の内空寸法調整機能を備えたジャッキカバーに関する。   The present invention relates to a jack cover, and more particularly, to a jack cover having a function of adjusting an internal space dimension in a vertical direction in a length adjusting jack for a beam.

山留工事では、対向する土留め壁の側圧を支持する切梁材間に切梁の長さ調整用のジャッキを介在させる。
切梁材は自重により鉛直方向に変位する。一方、ジャッキは、本来圧縮部材として設計されており、ねじ部の曲げ剛性が切梁材に比べて非常に小さいため、切梁材の変位に伴う曲げモーメントによって変形しやすい。
このため、ジャッキを補強するために、切梁材の端部間にジャッキカバーを取り付ける。
従来技術のジャッキカバーは、左側部材と右側部材の二部材で構成され、これらで切梁材を左右から挟み込み、両者をボルト締結して取り付ける（図５）。
ジャッキカバーは、切梁材の製品誤差に対応するため、鉛直方向の内空寸法Ｖを切梁材の梁成高さ（梁の上面から下面からまでの高さ）Ｈより１０ｍｍ程度大きく設計している。この為、ジャッキカバーを切梁材に付設すると、ジャッキカバーの自重により、切梁材の底面とジャッキカバーの内面との間に１０ｍｍ程度の隙間Ｇが生ずる（図６）。 In mountain construction, a jack for adjusting the length of the beam is interposed between the beam members that support the lateral pressure of the opposing retaining wall.
Cut beam material is displaced in the vertical direction by its own weight. On the other hand, the jack is originally designed as a compression member, and the bending rigidity of the threaded portion is much smaller than that of the cut beam material, so that the jack is easily deformed by a bending moment accompanying the displacement of the cut beam material.
For this reason, in order to reinforce the jack, a jack cover is attached between the ends of the beam members.
The jack cover of the prior art is composed of two members, a left side member and a right side member, and sandwiches a cut beam material from the left and right sides, and fastens them with bolts (FIG. 5).
The jack cover is designed so that the vertical dimension V in the vertical direction is about 10 mm larger than the beam height (the height from the upper surface to the lower surface of the beam) H of the beam material in order to cope with the product error of the beam material. . For this reason, when the jack cover is attached to the beam member, a gap G of about 10 mm is generated between the bottom surface of the beam member and the inner surface of the jack cover due to the weight of the jack cover (FIG. 6).

特開平８−１４４２８４号公報JP-A-8-144284

従来技術には次のような欠点がある。
＜１＞ジャッキが変形して切梁材の下部とジャッキカバーの間の隙間がなくなるまでジャッキカバーの剛性が機能しないため、切梁材の自重によるジャッキの鉛直方向の変形を防止することができない。特に、切梁材の座屈長が長い場合、ジャッキの変形量が大きくなり、強度不足になるおそれがある。
＜２＞ジャッキの操作時、ジャッキに取り付ける油圧ホースがジャッキカバーに干渉するため、左右のジャッキカバーのうち片側しか取り付けることができない。このため、プレロード導入時や除荷時などのジャッキ操作時には、完全なジャッキカバーの剛性の５０％しか機能せず、ジャッキカバー本来の剛性を発揮できない。 The prior art has the following drawbacks.
<1> The rigidity of the jack cover does not function until the jack is deformed and there is no gap between the lower part of the beam member and the jack cover, so that the vertical deformation of the jack due to the weight of the beam member cannot be prevented. . In particular, when the buckling length of the cut beam material is long, the amount of deformation of the jack becomes large, which may result in insufficient strength.
<2> When the jack is operated, the hydraulic hose attached to the jack interferes with the jack cover, so that only one of the left and right jack covers can be attached. For this reason, only 50% of the rigidity of the complete jack cover functions during jack operation such as when preload is introduced or unloaded, and the original rigidity of the jack cover cannot be exhibited.

上記のような課題を解決するための本発明のジャッキカバーは、上カバーと下カバーの分割構造であって、両者を締結具で締結することで、鉛直方向の内空寸法を調整可能であることを特徴とする。
本構成によって、切梁材の製品誤差に対応して、鉛直方向の内空寸法を調整することができる。 The jack cover of the present invention for solving the above-mentioned problems is a divided structure of an upper cover and a lower cover, and the inner space dimension in the vertical direction can be adjusted by fastening both with a fastener. It is characterized by that.
With this configuration, the inner dimension in the vertical direction can be adjusted in accordance with the product error of the beam.

本発明のジャッキカバーは、鉛直方向の最小内空寸法が切梁材の梁成高さ以下であってもよい。
本構成によって、上カバーと下カバーを切梁材の上下に密着させて拘束することができ、ジャッキの変形と同時にジャッキカバーの剛性を発揮することで、ジャッキの変形を有効に防ぐことができる。 The jack cover of the present invention may have a minimum vertical space dimension that is equal to or less than the beam height of the cut beam material.
With this configuration, the upper cover and the lower cover can be restrained by bringing them into close contact with the top and bottom of the beam material, and the deformation of the jack can be effectively prevented by exhibiting the rigidity of the jack cover simultaneously with the deformation of the jack. .

本発明のジャッキカバーは、切梁材の軸方向左右の分割構造であってもよい。
本構成によって、水平方向の内空寸法を調整することができる。 The jack cover of the present invention may have a split structure on the left and right in the axial direction of the beam member.
With this configuration, the horizontal dimension in the horizontal direction can be adjusted.

本発明のジャッキカバーは、上ベース部の中央に上ベース部の幅の１／２以上の開口幅の開口部を有していてもよい。
本構成により、切梁材にジャッキカバーを完全に付設したままジャッキに高圧ホースを接続することができるから、プレロードの導入時や除荷時にもジャッキカバー本来の剛性を発揮することができる。 The jack cover of the present invention may have an opening having an opening width equal to or greater than ½ of the width of the upper base portion at the center of the upper base portion.
With this configuration, since the high-pressure hose can be connected to the jack while the jack cover is completely attached to the beam member, the original rigidity of the jack cover can be exhibited even when the preload is introduced or unloaded.

本発明のジャッキカバーは、以上説明した構成を有するため、次の効果の少なくともひとつを備える。
＜１＞鉛直方向の内空寸法調整機能を備えるため、切梁材の製品誤差に関わらず、切梁材を上下から密着して拘束することができる。これによって、ジャッキの変形と同時にジャッキカバーの剛性を発揮することができ、ジャッキの変形を有効に防ぐことができる。
＜２＞上部に幅広な開口部を備えるため、切梁材にジャッキカバーを完全に付設した状態のまま、ジャッキに高圧ホースを接続することができる。これによって、プレロードの導入時や除荷時にも、ジャッキカバーを付設したままジャッキを操作でき、ジャッキカバー本来の剛性を発揮することができる。 Since the jack cover of the present invention has the above-described configuration, it has at least one of the following effects.
<1> Since the vertical dimension adjustment function is provided, the beam material can be closely attached and restrained from above and below regardless of the product error of the beam material. Thereby, the rigidity of the jack cover can be exhibited simultaneously with the deformation of the jack, and the deformation of the jack can be effectively prevented.
<2> Since the wide opening is provided in the upper part, the high-pressure hose can be connected to the jack while the jack cover is completely attached to the beam member. As a result, the jack can be operated with the jack cover attached even when the preload is introduced or unloaded, and the original rigidity of the jack cover can be exhibited.

本発明に係るジャッキカバーの説明図。Explanatory drawing of the jack cover which concerns on this invention. 本発明に係るジャッキカバーの説明図。Explanatory drawing of the jack cover which concerns on this invention. 本発明に係るジャッキカバーの上カバー及び下カバーの説明図。Explanatory drawing of the upper cover and lower cover of the jack cover which concern on this invention. 本発明に係るジャッキカバーの鉛直方向の内空寸法の説明図。Explanatory drawing of the internal space dimension of the vertical direction of the jack cover which concerns on this invention. 従来技術のジャッキカバーの説明図。Explanatory drawing of the jack cover of a prior art. 従来技術のジャッキカバーの説明図。Explanatory drawing of the jack cover of a prior art.

以下、図面を参照しながら本発明のジャッキカバーについて詳細に説明する。
なお、明細書および特許請求の範囲において「前」「後」「上」「下」「右」「左」「水平方向」「鉛直方向」等の用語は、供用時において切梁材側から軸方向に沿ってジャッキカバーを正面視した状態における各方位、つまり図４における各方位を表す。 Hereinafter, the jack cover of the present invention will be described in detail with reference to the drawings.
In the specification and claims, terms such as “front”, “rear”, “upper”, “lower”, “right”, “left”, “horizontal direction”, “vertical direction”, etc. Each direction in the state which looked at the jack cover from the front along the direction, that is, each direction in FIG.

［ジャッキカバー］
＜１＞全体の構成（図１、２）。
本発明のジャッキカバー１は、切梁材Ｓの長さ調整用ジャッキＪを補強し変形を防止する、概ね角形筒状の装置である。
ジャッキカバー１は、上カバー１０と下カバー２０を少なくとも備える。また、上カバー１０の中央に矩形の開口部４０を有する。
本例では、上カバー１０と下カバー２０がそれぞれ左右分割構造である四分割構造を採用する。ただしこれに限られず、例えば左右一体の二分割構造などであってもよい（実施例２）。
ジャッキカバー１は、上カバー１０と下カバー２０を締結具３０で締結することで、鉛直方向の内空寸法Ｖを調整可能な構造とする。 [Jack cover]
<1> Overall configuration (FIGS. 1 and 2).
The jack cover 1 according to the present invention is a generally square cylindrical device that reinforces the length adjusting jack J of the beam member S and prevents deformation.
The jack cover 1 includes at least an upper cover 10 and a lower cover 20. A rectangular opening 40 is provided in the center of the upper cover 10.
In this example, the upper cover 10 and the lower cover 20 employ a four-divided structure in which each is a left-right divided structure. However, the present invention is not limited to this. For example, a left-right integrated two-part structure may be used (Example 2).
The jack cover 1 has a structure in which the vertical inner dimension V can be adjusted by fastening the upper cover 10 and the lower cover 20 with a fastener 30.

＜２＞上カバー（図３）。
上カバー１０は、ジャッキＪの上部を保護する部材である。
上カバー１０は、底面で２本の切梁材Ｓの上面に当接する上ベース部１１と、上ベース部１１の両側から下方に延出する上サイド部１３と、を有する。 <2> Upper cover (FIG. 3).
The upper cover 10 is a member that protects the upper portion of the jack J.
The upper cover 10 includes an upper base portion 11 that contacts the upper surfaces of the two beam members S on the bottom surface, and an upper side portion 13 that extends downward from both sides of the upper base portion 11.

＜２．１＞上ベース部。
上ベース部１１は、切梁材Ｓの上面に当接する部材である。
本例では、上ベース部１１は、第一上ベース部１１ａと第二上ベース部１１ｂの左右分割構造を採用する。
第一上ベース部１１ａと第二上ベース部１１ｂは、相互に接続する側の側辺から上方に延出した水平連結部１２を備える。
各水平連結部１２には水平方向に貫通する複数のボルト孔を備える。
水平連結部１２同士を当接させ、ボルト孔に連通した締結具３０を締結することで、第一上ベース部１１ａと第二上ベース部１１ｂを連結することができる。また、締結具３０のボルトナットの螺合深さによって、水平方向の内空寸法を調整することができる。
第一上ベース部１１ａと第二上ベース部１１ｂそれぞれの上面には、切梁材Ｓにボルト接続するための複数の接続孔１５を備える。 <2.1> Upper base part.
The upper base portion 11 is a member that comes into contact with the upper surface of the beam member S.
In this example, the upper base portion 11 employs a left and right divided structure of the first upper base portion 11a and the second upper base portion 11b.
The 1st upper base part 11a and the 2nd upper base part 11b are provided with the horizontal connection part 12 extended upwards from the side of the side connected mutually.
Each horizontal connecting portion 12 includes a plurality of bolt holes penetrating in the horizontal direction.
The 1st upper base part 11a and the 2nd upper base part 11b can be connected by making the horizontal connection parts 12 contact | abut and fastening the fastener 30 connected to the bolt hole. Further, the inner dimension of the horizontal direction can be adjusted by the screwing depth of the bolt and nut of the fastener 30.
The upper surface of each of the first upper base portion 11a and the second upper base portion 11b is provided with a plurality of connection holes 15 for bolt connection to the beam member S.

＜２．２＞上サイド部。
上サイド部１３は、下カバー２０との鉛直方向連結機能を備える部材である。
本例では、上ベース部１１の左右両側辺から下方に向けて、アングル材からなる上サイド部１３をそれぞれ２つずつ設ける。なお、上サイド部１３の形状や数はこれに限られない。
各上サイド部１３の下端には、後述する下サイド部２３の鉛直連結部２４に底面で当接する、鉛直連結部１４を有する。
各鉛直連結部１４は上下に貫通するボルト孔を備える。 <2.2> Upper side part.
The upper side portion 13 is a member having a function of connecting to the lower cover 20 in the vertical direction.
In this example, two upper side portions 13 each made of an angle material are provided from the left and right sides of the upper base portion 11 downward. In addition, the shape and number of the upper side part 13 are not restricted to this.
At the lower end of each upper side portion 13, there is a vertical coupling portion 14 that comes into contact with a vertical coupling portion 24 of a lower side portion 23 described later at the bottom surface.
Each vertical connection part 14 is equipped with the bolt hole penetrated up and down.

＜３＞下カバー（図３）。
下カバー２０は、ジャッキＪの下部を保護する部材である。
下カバー２０は、上面で２本の切梁材Ｓの底面に当接する下ベース部２１と、下ベース部２１の両側から上方に延出する下サイド部２３と、を有する。 <3> Lower cover (FIG. 3).
The lower cover 20 is a member that protects the lower part of the jack J.
The lower cover 20 includes a lower base portion 21 that comes into contact with the bottom surfaces of the two beam members S on the upper surface, and a lower side portion 23 that extends upward from both sides of the lower base portion 21.

＜３．１＞下ベース部。
下ベース部２１は、切梁材Ｓの底面に当接する部材である。
本例では、下ベース部２１は、第一下ベース部２１ａと第二下ベース部２１ｂの左右分割構造を採用する。
第一下ベース部２１ａと第二下ベース部２１ｂは、相互に接続する側の側辺から下方に延出した水平連結部２２を備える。
各水平連結部２２には水平方向に貫通する複数のボルト孔を備える。
水平連結部２２同士を当接させ、ボルト孔に連通した締結具３０を締結することで、第一下ベース部２１ａと第二下ベース部２１ｂを連結するとともに、水平方向の内空寸法を調整することができる。
第一下ベース部２１ａと第二下ベース部２１ｂそれぞれの底面には、切梁材Ｓにボルト接続するための複数の接続孔２５を備える。 <3.1> Lower base part.
The lower base portion 21 is a member that contacts the bottom surface of the beam member S.
In this example, the lower base portion 21 employs a left and right divided structure of a first lower base portion 21a and a second lower base portion 21b.
The first lower base portion 21a and the second lower base portion 21b include a horizontal connecting portion 22 that extends downward from the sides on the side to be connected to each other.
Each horizontal connecting portion 22 includes a plurality of bolt holes penetrating in the horizontal direction.
The horizontal connecting portions 22 are brought into contact with each other, and the fastener 30 connected to the bolt hole is fastened to connect the first lower base portion 21a and the second lower base portion 21b, and adjust the horizontal inner dimension. can do.
The bottom surfaces of the first lower base portion 21a and the second lower base portion 21b are provided with a plurality of connection holes 25 for bolt connection to the beam member S.

＜３．２＞下サイド部。
下サイド部２３は、上カバー１０との鉛直方向連結機能を備える部材である。
本例では、下ベース部２１の左右両側辺から上方に向けて、アングル材からなる下サイド部２３をそれぞれ２つずつ設ける。なお、下サイド部２３の形状や数はこれに限られない。
各下サイド部２３の上端には、上サイド部１３の鉛直連結部１４に上面で当接する、鉛直連結部２４を有する。
各鉛直連結部２４は上下に貫通するボルト孔を備える。
上サイド部１３の鉛直連結部１４の底面と、下サイド部２３の鉛直連結部２４の上面を当接させ、ボルト孔に連通した締結具３０を締結することで、上カバー１０と下カバー２０を相互に引き寄せ、連結することができる。 <3.2> Lower side part.
The lower side portion 23 is a member having a function of connecting with the upper cover 10 in the vertical direction.
In this example, two lower side portions 23 each made of an angle material are provided from the left and right sides of the lower base portion 21 upward. In addition, the shape and number of the lower side part 23 are not restricted to this.
At the upper end of each lower side portion 23, there is a vertical connection portion 24 that comes into contact with the vertical connection portion 14 of the upper side portion 13 on the upper surface.
Each vertical connecting portion 24 includes a bolt hole penetrating vertically.
The upper cover 10 and the lower cover 20 are brought into contact by bringing the bottom surface of the vertical connection portion 14 of the upper side portion 13 into contact with the upper surface of the vertical connection portion 24 of the lower side portion 23 and fastening the fastener 30 communicated with the bolt hole. Can be attracted and connected to each other.

＜４＞締結具。
締結具３０は、第一上ベース部１１ａと第二上ベース部１１ｂ、第一下ベース部２１ａと第二下ベース部２１ｂ、および各上サイド部１３と下サイド部２３、をそれぞれ相互に締結するための部材である。
本例では、締結具３０としてボルトナットを採用する。 <4> Fasteners.
The fastener 30 fastens the first upper base portion 11a and the second upper base portion 11b, the first lower base portion 21a and the second lower base portion 21b, and the upper side portion 13 and the lower side portion 23, respectively. It is a member for doing.
In this example, a bolt and nut is employed as the fastener 30.

＜５＞開口部。
開口部４０は、上カバー１０の中央に形成するジャッキＪ操作用の開口である。
開口部４０は、第一上ベース部１１ａと第二上ベース部１１ｂの間に亘って設け、前後を水平連結部１２に挟まれる。
本例では、開口部４０は矩形を呈し、開口幅を上ベース部１１の幅の１／２以上とする。
これによって、切梁材Ｓにジャッキカバー１を付設した状態のまま、幅広い開口部４０を通してジャッキＪに高圧ホースを接続することができる。
こうして、ジャッキカバー１を設置したままジャッキＪを操作できるため、切梁材Ｓへのプレロード導入時や除荷時にもジャッキカバー１本来の剛性を発揮することができる。 <5> Opening.
The opening 40 is an opening for operating the jack J formed at the center of the upper cover 10.
The opening 40 is provided between the first upper base portion 11a and the second upper base portion 11b, and the front and rear are sandwiched between the horizontal connecting portions 12.
In this example, the opening 40 has a rectangular shape, and the opening width is set to ½ or more of the width of the upper base portion 11.
Accordingly, the high pressure hose can be connected to the jack J through the wide opening 40 while the jack cover 1 is attached to the beam member S.
Thus, since the jack J can be operated with the jack cover 1 installed, the original rigidity of the jack cover 1 can be exhibited even when the preload is introduced into the beam material S or unloaded.

＜６＞内空寸法（図４）。
本発明のジャッキカバー１は、鉛直方向の内空寸法Ｖの調整機能を備える点に特徴を有する。
ここで鉛直方向の内空寸法Ｖとは、ジャッキカバー１の正面視における上ベース部１１の底面と２１下ベース部の上面の間の最短寸法をいう。
上カバー１０の鉛直連結部１４と下カバー２０の鉛直連結部２４とを締結する締結具３０のボルトナットの螺合深さによって、両鉛直連結部１４、２４間の距離を変えて、鉛直方向の内空寸法Ｖを調整することができる。
図４（ａ）では両鉛直連結部１４、２４が一定距離離間しているが、図４（ｂ）では締結具３０が完全に螺着され、両鉛直連結部１４、２４が完全に接触している。この状態における内空寸法が、最小内空寸法Ｖminである。
本例では、ジャッキカバー１の鉛直方向の最小内空寸法Ｖminを、切梁材Ｓの梁成高さＨ以下に設定する。これによって、締結具３０を締結することで、上ベース部１１の底面と下ベース部２１の上面を切梁材Ｓの上下面に密接させ、切梁材Ｓを上下から拘束することができる。
ジャッキカバー１によって切梁材Ｓを上下から隙間なく拘束することによって、ジャッキＪの変形と同時にジャッキカバー１の剛性を発揮させ、ジャッキＪの変形を有効に防ぐことができる。 <6> Internal dimensions (FIG. 4).
The jack cover 1 of the present invention is characterized in that it has a function of adjusting the inner space dimension V in the vertical direction.
Here, the vertical dimension V in the vertical direction means the shortest dimension between the bottom surface of the upper base portion 11 and the upper surface of the 21 lower base portion in the front view of the jack cover 1.
Depending on the screwing depth of the bolts and nuts of the fasteners 30 that fasten the vertical connecting portion 14 of the upper cover 10 and the vertical connecting portion 24 of the lower cover 20, the distance between the two vertical connecting portions 14, 24 is changed to the vertical direction. The inner dimension V can be adjusted.
In FIG. 4 (a), the two vertical connecting portions 14, 24 are spaced apart by a certain distance. However, in FIG. 4 (b), the fastener 30 is completely screwed and the two vertical connecting portions 14, 24 are in complete contact. ing. The inner space dimension in this state is the minimum inner space dimension Vmin .
In this example, the minimum inner space dimension V min in the vertical direction of the jack cover 1 is set to be equal to or less than the beam forming height H of the cut beam material S. Thus, by fastening the fastener 30, the bottom surface of the upper base portion 11 and the upper surface of the lower base portion 21 can be brought into close contact with the upper and lower surfaces of the beam member S, and the beam member S can be restrained from above and below.
By constraining the beam member S from above and below with the jack cover 1 without any gaps, the jack cover 1 can exhibit its rigidity simultaneously with the deformation of the jack J, and the deformation of the jack J can be effectively prevented.

＜７＞据付方法。
ジャッキカバー１のジャッキＪおよび切梁材Ｓへの据付方法について説明する。
（１）仮組み
地上で第一上ベース部１１ａと第一下ベース部２１ａ、第二上ベース部１１ｂと第二下ベース部２１ｂ、をそれぞれ締結具３０で仮締結して上下に仮組みする。
（２）据付け
第一上ベース部１１ａと第一下ベース部２１ａをクレーンで吊り上げ、断面コの字状の内空を、側方から切梁材Ｓに嵌め込む。同様に第二上ベース部１１ｂと第二下ベース部２１ｂも同様に切梁材Ｓに嵌め込む。
左右の各水平連結部１２、２２を締結具３０で仮締結する。
各接続孔１５、２５と切梁材Ｓのボルトジョイント孔をボルト締結して、切梁材Ｓにジャッキカバーを据え付ける。
（３）水平方向の内空寸法調整
水平連結部１２、２２を締結具３０で本締結して、上サイド部１３と下サイド部２３で切梁材Ｓを側方から拘束する。
（４）鉛直方向の内空寸法調整
鉛直連結部１４、２４を締結具３０で本締結して、上ベース部１１と下ベース部２１で切梁材Ｓを上下から拘束する。
なお、上記は一例であり、例えば工程（３）（４）の順序を入れ替えてもよい。 <7> Installation method.
A method of installing the jack cover 1 on the jack J and the beam member S will be described.
(1) Temporary assembly On the ground, the first upper base portion 11a and the first lower base portion 21a, and the second upper base portion 11b and the second lower base portion 21b are temporarily fastened by the fasteners 30 and temporarily assembled vertically. .
(2) Installation The first upper base portion 11a and the first lower base portion 21a are lifted by a crane, and the inner space having a U-shaped cross section is fitted into the beam member S from the side. Similarly, the second upper base portion 11b and the second lower base portion 21b are similarly fitted into the beam member S.
The left and right horizontal connecting portions 12 and 22 are temporarily fastened with the fasteners 30.
The connection hole 15, 25 and the bolt joint hole of the beam member S are bolted, and the jack cover is installed on the beam member S.
(3) Horizontal dimension adjustment in the horizontal direction The horizontal connecting portions 12 and 22 are finally fastened by the fasteners 30, and the upper beam portion 13 and the lower side portion 23 restrain the beam material S from the side.
(4) Vertical space adjustment in the vertical direction The vertical connection portions 14 and 24 are finally fastened by the fasteners 30, and the upper and lower base portions 11 and 21 restrain the beam material S from above and below.
Note that the above is an example, and the order of the steps (3) and (4) may be changed, for example.

＜８＞比較試験。
本発明のジャッキカバー１と従来技術のジャッキカバーとの変位量を比較計測した結果を表１に示す。
本発明のジャッキカバー１は、従来技術に比べ、切梁材Ｓの自重による最大変位量が４３％低減した。この試験結果によって、本発明のジャッキカバー１のジャッキ変形防止機能の高さが示された。 <8> Comparative test.
Table 1 shows the results of comparative measurement of the displacement between the jack cover 1 of the present invention and the jack cover of the prior art.
In the jack cover 1 of the present invention, the maximum displacement amount due to the dead weight of the cut beam material S is reduced by 43% compared to the prior art. This test result showed the height of the jack deformation preventing function of the jack cover 1 of the present invention.

Figure 2018204403
Figure 2018204403

[上下二分構造とした例]
実施例１では、上カバー１０と下カバー２０がそれぞれ左右分割体であったが、これを左右一体構造としてもよい。
本例の場合、上カバー１０と下カバー２０とで切梁材Ｓを上下から挟み込み、各鉛直連結部１４、２４を締結具３０で締結して設置する。
本例では、ジャッキカバー１の構造が簡素化し、製造コストが安価になる、施工手順が少なくなる等の更なる効果を奏する。 [Example of upper and lower bisection structure]
In the first embodiment, the upper cover 10 and the lower cover 20 are each a left and right divided body, but this may be a left and right integrated structure.
In the case of this example, the cut beam material S is sandwiched from above and below by the upper cover 10 and the lower cover 20, and the vertical connecting portions 14 and 24 are fastened by the fasteners 30 and installed.
In this example, the structure of the jack cover 1 is simplified, and further effects such as a reduction in manufacturing cost and a reduction in construction procedures are achieved.

１ ジャッキカバー
１０ 上カバー
１１ ベース部
１１ａ 第一ベース部
１１ｂ 第二ベース部
１２ 水平連結部
１３ サイド部
１４ 鉛直連結部
１５ 接続孔
２０ 下カバー
２０ａ 第一下カバー
２０ｂ 第二下カバー
２１ ベース部
２２ 水平連結部
２３ サイド部
２４ 鉛直連結部
２５ 接続孔
３０ 締結具
４０ 開口部
Ｊ ジャッキ
Ｓ 切梁材
Ｈ 梁成高さ
Ｖ 鉛直方向の内空寸法
Ｖmin 鉛直方向の最小内空寸法 DESCRIPTION OF SYMBOLS 1 Jack cover 10 Upper cover 11 Base part 11a 1st base part 11b 2nd base part 12 Horizontal connection part 13 Side part 14 Vertical connection part 15 Connection hole 20 Lower cover 20a First lower cover 20b Second lower cover 21 Base part 22 Horizontal connection portion 23 Side portion 24 Vertical connection portion 25 Connection hole 30 Fastener 40 Opening portion J Jack S Beam material H Beam height V Vertical clearance in the vertical direction V min Minimum clearance in the vertical direction

Claims (4)

山留構造において、対向する土留め壁の側圧を支持する２本の切梁材の間に介在するジャッキを保護する、ジャッキカバーであって、
上カバーと、下カバーと、を備え、
前記上カバーは、底面で前記２本の切梁材の上面に当接する上ベース部と、前記上ベース部の両側から下方に延出する上サイド部と、を有し、
前記下カバーは、上面で前記２本の切梁材の底面に当接する下ベース部と、前記下ベース部の両側から上方に延出する下サイド部と、を有し、
前記上ベース部の底面と前記下ベース部の上面の間に、鉛直方向の内空寸法を定義し、
前記上サイド部と前記下サイド部とを締結具で締結することで、鉛直方向の内空寸法を調整可能であることを特徴とする、
ジャッキカバー。 In the mountain retaining structure, a jack cover that protects a jack interposed between two beam members that support the lateral pressure of the opposite earth retaining wall,
An upper cover and a lower cover;
The upper cover has an upper base portion that contacts the upper surfaces of the two beam members at the bottom surface, and an upper side portion that extends downward from both sides of the upper base portion,
The lower cover has a lower base portion that comes into contact with the bottom surfaces of the two beam members on the upper surface, and a lower side portion that extends upward from both sides of the lower base portion,
A vertical inner space dimension is defined between the bottom surface of the upper base portion and the upper surface of the lower base portion,
By fastening the upper side part and the lower side part with a fastener, it is possible to adjust the inner dimension of the vertical direction,
Jack cover. 鉛直方向の最小内空寸法が、前記切梁材の梁成高さ以下であることを特徴とする、請求項１に記載のジャッキカバー。   The jack cover according to claim 1, wherein a minimum inner space dimension in a vertical direction is equal to or less than a beam height of the cut beam material. 前記上ベース部及び前記下ベース部の少なくとも一方が、前記切梁材の軸方向左右の分割体からなり、両分割体を締結具で締結することによって、水平方向の内空寸法を調整可能に構成したことを特徴とする、請求項１又は２に記載のジャッキカバー。   At least one of the upper base portion and the lower base portion is composed of a split body on the left and right sides in the axial direction of the beam member, and the horizontal inner space dimension can be adjusted by fastening both the split bodies with a fastener. The jack cover according to claim 1 or 2, wherein the jack cover is configured. 前記上ベース部の中央に開口部を有し、前記開口部の開口幅は前記上ベース部の幅の１／２以上であることを特徴とする、請求項１乃至３のいずれか一項に記載のジャッキカバー。   4. The apparatus according to claim 1, further comprising an opening at a center of the upper base portion, wherein the opening width of the opening is not less than ½ of the width of the upper base portion. 5. The described jack cover.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55105029A (en) * 1979-02-01 1980-08-12 Okasan Kogyo Kk Sheathing of trench side wall
JPH05148837A (en) * 1991-11-28 1993-06-15 Takenaka Komuten Co Ltd Slide-down type strut and inverted construction method using the slide-down type strut
JPH08144284A (en) * 1994-11-17 1996-06-04 Nishimatsu Constr Co Ltd Landslide protection wall timbering
JPH08260463A (en) * 1995-03-24 1996-10-08 Toda Constr Co Ltd Strut system and method of strut type sheathing construction
EP1362980A1 (en) * 2002-05-16 2003-11-19 Protecno Italia S.r.l. Safety device for open-pit mining
KR20140027840A (en) * 2012-08-27 2014-03-07 주식회사 한빛구조엔지니어링 Supporting structure for underground external wall using double layer wale and truss combined strut

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55105029A (en) * 1979-02-01 1980-08-12 Okasan Kogyo Kk Sheathing of trench side wall
JPH05148837A (en) * 1991-11-28 1993-06-15 Takenaka Komuten Co Ltd Slide-down type strut and inverted construction method using the slide-down type strut
JPH08144284A (en) * 1994-11-17 1996-06-04 Nishimatsu Constr Co Ltd Landslide protection wall timbering
JPH08260463A (en) * 1995-03-24 1996-10-08 Toda Constr Co Ltd Strut system and method of strut type sheathing construction
EP1362980A1 (en) * 2002-05-16 2003-11-19 Protecno Italia S.r.l. Safety device for open-pit mining
KR20140027840A (en) * 2012-08-27 2014-03-07 주식회사 한빛구조엔지니어링 Supporting structure for underground external wall using double layer wale and truss combined strut

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