JP7178046B2 - Strut jack installation box and earth retaining strut - Google Patents

Strut jack installation box and earth retaining strut Download PDF

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JP7178046B2
JP7178046B2 JP2018230631A JP2018230631A JP7178046B2 JP 7178046 B2 JP7178046 B2 JP 7178046B2 JP 2018230631 A JP2018230631 A JP 2018230631A JP 2018230631 A JP2018230631 A JP 2018230631A JP 7178046 B2 JP7178046 B2 JP 7178046B2
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strut
jack
inner frame
installation box
outer frame
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JP2020094329A (en
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敏也 有冨
正貴 藤本
章 橋本
竜生 北川
裕一 鎌田
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Gecoss Corp
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Description

本発明は、切梁ジャッキを内蔵した切梁ジャッキ設置ボックスおよび当該切梁ジャッキ設置ボックスを備えた山留切梁に関し、特に切梁ジャッキが切梁に作用する軸力のみを負担し、曲げ力とせん断力は負担しないようにして、切梁ジャッキを切梁軸方向の任意の位置に設置できるようにすると共に、切梁に必要量の軸力を容易にかつ安全に導入できるようにしたものである。 The present invention relates to a strut jack installation box with a built-in strut jack and an earth retaining strut equipped with the strut jack installation box. The strut jack can be installed at any position in the axial direction of the strut, and the necessary amount of axial force can be easily and safely introduced into the strut. is.

一般に山留用の切梁20は、切梁主材21、切梁ジャッキ22、継手金物23、切梁補助ピース24および調整材25を備え、切梁ジャッキ22は継手金物23と切梁主材21との間、切梁補助ピース24と調整材25は継手金物23と腹起し26との間にそれぞれ配置され、各部材どうしは互いに複数の接合ボルト27によって脱着可能に接合されている(図７参照)。 In general, the strut 20 for earth retaining includes a strut main member 21, a strut jack 22, a joint metal 23, a strut auxiliary piece 24 and an adjustment member 25. The strut jack 22 is between the joint metal 23 and the strut main member 21 The strut auxiliary piece 24 and the adjustment member 25 are arranged between the joint hardware 23 and the wale 26, respectively, and each member is detachably joined to each other by a plurality of joint bolts 27 (see FIG. 7).

また、切梁補助ピース24および調整材25の両側に、一組の火打梁28,28が対称に配置され、特に切梁側の端部は継手金物23に複数の接合ボルト27によって脱着可能に接合される。 In addition, a pair of strut beams 28, 28 are symmetrically arranged on both sides of the strut auxiliary piece 24 and the adjusting material 25, and especially the end on the strut side can be attached to and detached from the joint hardware 23 by a plurality of joint bolts 27. spliced.

ところで、切梁ジャッキ22は切梁20にプレロードを導入して、周辺地盤の沈下やクラックを抑制したり、山留支保工の剛性を高めて工事の安全等を確保するために用いられるが、切梁ジャッキ22の設置部は強度的に切梁20の弱点とされているため、切梁ジャッキ22は特に曲げモーメントの小さい位置に設置するのが望ましく、本来なら継手金物23と切梁補助ピース24との間に設置するのが望ましい。 By the way, the strut jacks 22 are used to introduce a preload to the struts 20 to suppress subsidence and cracks in the surrounding ground, and to increase the rigidity of the shoring system to ensure the safety of construction work. Since the installation part of the strut jack 22 is the weak point of the strut 20 in terms of strength, it is desirable to install the strut jack 22 at a position where the bending moment is particularly small. It is desirable to install it between 24.

特開平04-068115号公報JP-A-04-068115

しかし、継手金物23と切梁補助ピース24との間に切梁ジャッキ22を設置すると、切梁主材21が火打梁28によって拘束されるため、切梁ジャッキ22の操作が困難になり、切梁20にプレロードを自由に導入できなくなるという課題があった。このため、切梁ジャッキ22は、今なお継手金物23と切梁主材21との間に設置されている。 However, when the strut jacks 22 are installed between the joint hardware 23 and the strut auxiliary pieces 24, the strut main members 21 are constrained by the strut beams 28, making it difficult to operate the strut jacks 22. There was a problem that preload could not be freely introduced into Therefore, the strut jack 22 is still installed between the joint hardware 23 and the strut main member 21 .

本発明は、このような現状に鑑みてなされたもので、特に切梁ジャッキが切梁に作用する軸力以外の曲げ力とせん断力を負担しないようにして、切梁ジャッキを切梁軸方向の任意の位置に設置できるようにすると共に、切梁に必要量の軸力を容易にかつ安全に導入できるようにした切梁ジャッキ設置ボックスおよび山留切梁を提供することを目的とする。 The present invention has been made in view of such a situation. In particular, the strut jacks are arranged so that they do not bear bending forces and shearing forces other than the axial force acting on the struts. To provide a strut jack installation box and an earth retaining strut which can be installed at an arbitrary position of a strut and can easily and safely introduce a necessary amount of axial force to the strut.

本発明は、切梁と同一方向に配置され、かつ前記切梁の軸方向に伸縮して前記切梁に軸力を導入する切梁ジャッキが内蔵された切梁ジャッキ設置ボックスの発明であり、内枠と当該内枠が内接する外枠とを備え、前記外枠と内枠は前記切梁ジャッキの伸縮に伴って、切梁軸方向の相反する方向にスライド可能に配置され、前記切梁ジャッキの外周と前記内枠間は離間しており、かつ前記切梁に作用する軸力は前記切梁ジャッキが伝達し、前記切梁に作用する曲げ力とせん断力は前記外枠と内枠との当接面で伝達するように構成されていることを特徴とするものである。 The present invention is an invention of a strut jack installation box containing a strut jack that is arranged in the same direction as a strut and expands and contracts in the axial direction of the strut to introduce an axial force to the strut, An inner frame and an outer frame in which the inner frame is inscribed, the outer frame and the inner frame are arranged so as to be slidable in opposite directions of the strut axis direction as the strut jack expands and contracts, and the strut The outer circumference of the jack and the inner frame are separated from each other, and the axial force acting on the strut is transmitted by the strut jack, and the bending force and shear force acting on the strut are transmitted by the outer frame and the inner frame. It is characterized in that it is configured to transmit at the contact surface with.

特に、前記切梁ジャッキの外周と前記内枠間が離間し、かつ前記外枠と内枠は前記切梁ジャッキの伸縮に伴って、切梁軸方向の相反する方向にスライド可能に配置されているため、前記切梁に軸力を導入する際に、前記内枠と外枠の抵抗を受けることはなく、切梁に必要量の軸力を容易にかつ安全に導入することができる。 In particular, the outer periphery of the strut jack and the inner frame are spaced apart, and the outer frame and the inner frame are arranged so as to be slidable in opposite directions of the strut axis direction as the strut jack expands and contracts. Therefore, when introducing an axial force to the struts, the necessary amount of axial force can be easily and safely introduced to the struts without being subjected to the resistance of the inner frame and the outer frame.

また、前記切梁ジャッキの外周と前記内枠間が離間しており、かつ前記切梁に作用する曲げ力とせん断力は前記内枠と外枠との当接面で伝達するように構成され、前記切梁ジャッキが曲げ力とせん断力を受けないため、前記切梁ジャッキの設置位置として構造的に不利となる位置はなく、切梁軸方向の任意の位置を自由に選択することができる。 Further, the outer circumference of the strut jack and the inner frame are spaced apart, and the bending force and shear force acting on the strut are transmitted by the contact surface between the inner frame and the outer frame. , Since the strut jack does not receive bending force and shear force, there is no position that is structurally disadvantageous as the installation position of the strut jack, and any position in the strut axis direction can be freely selected. .

また、前記内枠と外枠との当接面に摩擦低減材を介在することで、前記内枠と外枠の切梁軸方向へのスライドがスムーズになり、切梁ジャッキの操作をスムーズに作動させることができる。 In addition, by interposing a friction reducing material on the contact surface between the inner frame and the outer frame, the inner frame and the outer frame slide smoothly in the strut axial direction, and the strut jack can be operated smoothly. can be activated.

本発明は、内枠と当該内枠が内接する外枠とを備え、前記外枠と内枠は前記切梁ジャッキの伸縮に伴って、切梁軸方向の相反する方向にスライド可能に配置され、前記切梁ジャッキの外周と前記内枠間は離間しており、かつ前記切梁に作用する軸力は前記切梁ジャッキが伝達し、前記切梁に作用する曲げ力とせん断力は前記外枠と内枠との当接面で伝達するように構成され、前記切梁ジャッキが曲げ力とせん断力を受けないため、前記切梁ジャッキの設置位置として構造的に不利となる位置はなく、切梁軸方向の任意の位置を自由に選択することができる。 The present invention comprises an inner frame and an outer frame to which the inner frame is inscribed, and the outer frame and the inner frame are arranged so as to be slidable in opposite directions of the strut axis direction as the strut jack expands and contracts. , the outer circumference of the strut jack and the inner frame are separated from each other, the axial force acting on the strut is transmitted by the strut jack, and the bending force and shear force acting on the strut are transmitted by the outer Since it is configured to transmit at the contact surface between the frame and the inner frame, and the strut jack does not receive bending force and shear force, there is no position that is structurally disadvantageous as the installation position of the strut jack, Any position in the axial direction of the strut can be freely selected.

内部に切梁ジャッキが設置された切梁ジャッキ設置ボックスを備えた山留切梁の一部平面図である。FIG. 4 is a partial plan view of an earth retaining strut provided with a strut jack installation box in which a strut jack is installed. 切梁ジッャキ設置ボックスの斜視図である。It is a perspective view of a strut jack installation box. 図２に図示する切梁ジャッキ設置ボックスを図示したものであり、図3(a)は平面図、図3(b)は正面図、図3(c)は図3(a)におけるA-A線断面図、図3(d)は右側面図である。FIG. 3(a) is a plan view, FIG. 3(b) is a front view, and FIG. 3(c) is a cross section along line A-A in FIG. 3(a). FIG. 3(d) is a right side view. 切梁ジャッキを内部に備えた切梁ジャッキ設置ボックスを図示したものであり、図4(a)は正面図、4(b)図4(a)におけるB-B線断面図である。4(a) is a front view and 4(b) is a sectional view taken along the line BB in FIG. 4(a). FIG. 本発明の変形例を図示したものであり、内部に切梁ジャッキが設置された切梁ジャッキ設置ボックスを備えた山留切梁の一部平面図である。It is a partial plan view of an earth retaining strut provided with a strut jack installation box in which a strut jack is installed, which illustrates a modification of the present invention. 継手金物を図示したものであり、図6(a)は平面図、図6(b)は図6(a)におけるC-C線断面図、図6(c)は図6(a)におけるD-D線断面図、図6(d)は図6(a)におけるE-E線矢視図である。Fig. 6(a) is a plan view, Fig. 6(b) is a sectional view taken along line C-C in Fig. 6(a), and Fig. 6(c) is a sectional view taken along line D-D in Fig. 6(a). FIG. 6(d) is a view taken along line EE in FIG. 6(a). 切梁ジャッキが設置された従来の山留切梁一部平面図である。FIG. 2 is a partial plan view of a conventional earth retaining strut on which a strut jack is installed.

図１～図４は、本発明の一実施形態を図示したものであり、山留切梁１は切梁主材２、切梁ジャッキ３、切梁ジャッキ設置ボックス４、継手金物５、切梁補助ピース６および調整材７を備え、対向する腹起し8,8間に架設されている。 FIGS. 1 to 4 illustrate an embodiment of the present invention, and an earth retaining strut 1 includes a strut main member 2, a strut jack 3, a strut jack installation box 4, a joint metal 5, and a strut auxiliary piece. 6 and an adjusting member 7, and are installed between opposing wale 8,8.

切梁主材２、切梁ジャッキ３、切梁ジャッキ設置ボックス４、継手金物５、切梁補助ピース６および調整材７は、同一軸線上に配置され、特に切梁ジャッキ３は切梁ジャッキ設置ボックス４内に配置されている(図４参照)。そして、各部材どうしは複数の接合ボルト９によって脱着可能に接合されている。 The strut main member 2 , the strut jack 3 , the strut jack installation box 4 , the joint hardware 5 , the strut auxiliary piece 6 and the adjustment member 7 are arranged on the same axis. (see Figure 4). Each member is detachably joined with a plurality of joining bolts 9 .

また、切梁補助ピース６および調整材７の両側に、一組の火打梁10,10が対称に配置され、その山留切梁１側の端部は継手金物５の側部に、腹起し８側の端部は腹起し８の側部にそれぞれ複数の接合ボルト９によって脱着可能に接合されている。 A pair of strut beams 10, 10 are symmetrically arranged on both sides of the strut auxiliary piece 6 and the adjustment member 7, and the ends on the side of the earth retaining strut 1 are attached to the sides of the joint hardware 5. The end portion on the side of the buttress 8 is detachably joined to the side portion of the wale 8 by a plurality of joining bolts 9 .

なお、切梁主材２、継手金物５、調整材７、腹起し８および火打梁10は、いずれもＨ形鋼などの形鋼や角形鋼管から形成されている。また、継手金物５の両側部に火打梁10の端部をボルト接合するための継手5a,5aが山留切梁１の長手方向にリブ状に連続して形成されている。 The strut main material 2, the joint hardware 5, the adjustment material 7, the wale 8, and the strut beam 10 are all made of shaped steel such as H-shaped steel or square steel pipe. Joints 5a, 5a for bolting the ends of the stilt beam 10 are formed on both sides of the joint metal 5 in a continuous rib-like shape in the longitudinal direction of the stilt beam 1. As shown in FIG.

切梁ジャッキ設置ボックス４は、切梁主材２側に配置された外枠11と継手金物５側に配置された内枠12を備え、外枠11と内枠12は共に山留切梁１の軸方向に一定長の方形または円形断面の筒状に形成されている。
なお、実施形態における外枠11と内枠12は方形断面の筒状に形成されている。また、外枠11と内枠12は方形または円形の鋼管、または複数の鋼板を円形または方形断面形に配置しかつ溶接することにより形成されている。 The strut jack installation box 4 has an outer frame 11 arranged on the strut main member 2 side and an inner frame 12 arranged on the joint metal 5 side. It is formed in a cylindrical shape with a square or circular cross section having a constant length in the direction.
Note that the outer frame 11 and the inner frame 12 in the embodiment are formed in a tubular shape with a square cross section. The outer frame 11 and the inner frame 12 are formed by arranging square or circular steel pipes or a plurality of steel plates in a circular or square cross section and welding them.

また、外枠11内に内枠12が内接した状態に配置され、両者は切梁ジャッキ３が切梁軸方向に伸縮すると同時に、切梁ジャッキ３と共に山留切梁１の軸方向の相反する方向に自由にスライドするようになっている(図４参照)。 In addition, the inner frame 12 is arranged in the outer frame 11 in a state of being inscribed, and at the same time the strut jack 3 expands and contracts in the axial direction of the strut, and at the same time, the axial direction of the earth retaining strut 1 is opposed to the strut jack 3. It is designed to slide freely in any direction (see Fig. 4).

また特に、外枠11の内周面と内枠12の外周面は密着し、山留切梁１の軸方向以外の方向には変位することなく、同一軸線上で山留切梁１の軸方向の相反する方向にスムーズにスライドするようになっている。 In particular, the inner peripheral surface of the outer frame 11 and the outer peripheral surface of the inner frame 12 are in close contact with each other, and the shaft of the earth retaining strut 1 does not move in any direction other than the axial direction of the earth retaining strut 1 on the same axis. It slides smoothly in opposite directions.

なお、外枠11と内枠12との当接面に摩擦低減材が介在してあれば、外枠11と内枠12は切梁軸方向の相反する方向にスムーズにスライドすることができる。また、外枠11と内枠12は、山留切梁１に作用する軸力、曲げ力およびせん断力に対して充分な強度を備えるべく断面設計されている。 If a friction reducing material is interposed between the contact surfaces of the outer frame 11 and the inner frame 12, the outer frame 11 and the inner frame 12 can smoothly slide in opposite directions of the strut axial direction. In addition, the outer frame 11 and the inner frame 12 are cross-sectionally designed to have sufficient strength against the axial force, bending force and shearing force acting on the earth retaining strut 1 .

また、外枠11と内枠12は、必ずしも閉断面の筒状である必要はなく、外周が例えば格子状などに軸組された開断面形状に形成されていてもよい。 Further, the outer frame 11 and the inner frame 12 do not necessarily have to have a cylindrical shape with a closed cross section, and may have an open cross-sectional shape in which the outer circumferences are assembled in a lattice shape, for example.

さらに、外枠11の切梁主材２側の端部に継手プレート13、内枠12の継手金物５側の端部に継手プレート14がそれぞれ取り付けられている。そして、継手プレート13は切梁主材２の端部に、継手プレート14は継手金物５の端部にそれぞれ複数の接合ボルトによって脱着可能にボルト止めされている。 Further, a joint plate 13 is attached to the end of the outer frame 11 on the side of the strut main member 2, and a joint plate 14 is attached to the end of the inner frame 12 on the side of the joint hardware 5, respectively. The joint plate 13 is detachably bolted to the end of the strut main member 2, and the joint plate 14 is detachably bolted to the end of the joint hardware 5 by a plurality of joint bolts.

切梁ジャッキ３は、切梁ジャッキ設置ボックス４内に山留切梁１の軸方向に伸縮するように設置され、その一端側3aは外枠11の継手プレート13に、他端側3bは内枠12の継手プレート14にそれぞれ複数の接合ボルトによって脱着可能に接続されている。また、切梁ジャッキ３の外周は、切梁ジャッキ設置ボックス４の外枠11および内枠12の内周より離間されており、山留切梁１に作用するせん断力と曲げ力が切梁ジャッキ３に伝達されないようなっている。 The strut jack 3 is installed in the strut jack installation box 4 so as to extend and contract in the axial direction of the earth retaining strut 1. They are detachably connected to the joint plates 14 of the frame 12 by a plurality of joint bolts. In addition, the outer circumference of the strut jack 3 is separated from the inner circumference of the outer frame 11 and the inner frame 12 of the strut jack installation box 4, so that the shear force and bending force acting on the earth retaining strut 1 are applied to the strut jack. 3 is not transmitted.

なお、符号15は、切梁ジャッキ設置ボックス４内における切梁ジャッキ３の切梁軸方向の位置を調整するための調整材である。 Reference numeral 15 denotes an adjustment member for adjusting the position of the strut jack 3 in the strut jack installation box 4 in the axial direction of the strut.

このような構成において、切梁ジャッキ３の外周と内枠12間が離間しており、かつ外枠11と内枠12は切梁ジャッキ３の伸縮に伴って切梁軸方向の相反する方向にスライド可能に配置されているため、切梁ジャッキ３によって山留切梁１に必要量の軸力を容易にかつ安全に導入することができる。 In such a configuration, the outer periphery of the strut jack 3 and the inner frame 12 are spaced apart, and the outer frame 11 and the inner frame 12 move in opposite directions of the strut axis as the strut jack 3 expands and contracts. Since it is slidably arranged, the required amount of axial force can be easily and safely introduced to the earth retaining strut 1 by the strut jack 3 .

また、切梁ジャッキ３の外周と内枠12間が離間しており、かつ山留切梁１に作用する曲げ力とせん断力が、外枠11と内枠12との当接面で伝達するように構成され、切梁ジャッキ３は山留切梁１に作用する曲げ力やせん断力を受けないため、切梁ジャッキ３の設置位置として構造的に不利となる位置はなく、切梁軸方向の任意の位置を自由に選択することができる。 In addition, the outer circumference of the strut jack 3 and the inner frame 12 are spaced apart, and the bending force and shear force acting on the earth retaining strut 1 are transmitted by the contact surface between the outer frame 11 and the inner frame 12. Since the strut jack 3 does not receive bending force or shear force acting on the earth retaining strut 1, there is no structurally disadvantageous position for installing the strut jack 3, and the strut jack 3 is installed in the axial direction of the strut. can be freely selected.

図５と図６は、本発明の変形例を図示したものであり、切梁ジャッキ設置ボックス４と切梁補助ピース６との間に継手金物16が配置され、当該継手金物16を介して切梁ジャッキ設置ボックス４と切梁補助ピース６と左右火打梁10,10が互いに脱着可能に接合されている。 FIGS. 5 and 6 illustrate a modification of the present invention, in which a joint fitting 16 is arranged between the strut jack installation box 4 and the strut auxiliary piece 6, and the joint fitting 16 is used for cutting. A beam jack installation box 4, a strut auxiliary piece 6, and left and right strike beams 10, 10 are detachably joined to each other.

継手金物16は、山留切梁１の軸方向に配置された継手本体16aと、当該継手本体16aの両側部に対称に突設された左右継手部16b,16bとから一体に形成され、また、継手本体16aおよび左右継手部16b,16bは、それぞれＨ形鋼または角形鋼管より形成されている。 The joint hardware 16 is integrally formed from a joint body 16a arranged in the axial direction of the earth stop beam 1 and left and right joint portions 16b, 16b symmetrically protruding from both sides of the joint body 16a, and , the joint main body 16a and the left and right joint portions 16b, 16b are each made of H-shaped steel or square steel pipe.

そして、継手本体16aの両端部に切梁ジャッキ設置ボックス４と切梁補助ピース６がそれぞれボルト接合され、継手部16bの端部に左右火打梁の端部がそれぞれボルト接合されている。 The strut jack installation box 4 and the strut auxiliary piece 6 are bolted to both ends of the joint body 16a, and the ends of the left and right strut beams are bolted to the ends of the joint portion 16b.

なお、符号16cは継手本体16aの両端部および左右継手部16b,16bの端部に取り付けられ、切梁ジャッキ設置ボックス４、切梁補助ピース６および左右火打梁がそれぞれボルト接合され、継手部16bの端部に左右火打梁10を接合するための継手プレートである。また、継手本体16aは複数の鋼板を矩形断面形に溶接して形成することもできる。 Reference numeral 16c is attached to both ends of the joint body 16a and to the ends of the left and right joints 16b, 16b. It is a joint plate for joining the left and right strike beams 10 to the ends of the . The joint main body 16a can also be formed by welding a plurality of steel plates into a rectangular cross section.

本発明は、切梁ジャッキが切梁に作用する曲げ力とせん断力を負担しないようにして、切梁ジャッキを切梁軸方向の任意の位置に設置できるようにすると共に、切梁に必要量の軸力を容易にかつ安全に導入することができる。 The present invention prevents the strut jack from bearing the bending force and shear force acting on the strut, and enables the strut jack to be installed at any position in the axial direction of the strut, and the necessary amount of the strut to the strut. can be introduced easily and safely.

１ 山留切梁
２ 切梁主材
３ 切梁ジャッキ
４ 切梁ジャッキ設置ボックス
５ 継手金物
６ 切梁補助ピース
７ 調整材
８ 腹起し
９ 接合ボルト
10 火打梁
11 外枠
12 内枠
13 継手プレート
14 継手プレート
15 調整材
16 継手金物
16a 継手本体
16b 継手プレート
16c 継手プレート 1 Earth retaining strut 2 Strut main member 3 Strut jack 4 Strut jack installation box 5 Joint hardware 6 Strut auxiliary piece 7 Adjustment material 8 Wing 9 Joint bolt
10 Fire beam
11 Outer frame
12 inner frame
13 Joint plate
14 Joint plate
15 Conditioner
16 Fitting hardware
16a Joint body
16b Joint plate
16c joint plate

Claims (3)

切梁の軸方向に伸縮して前記切梁に軸力を導入する切梁ジャッキが内蔵された切梁ジャッキ設置ボックスであって、筒状に形成され、前記切梁ジャッキが内蔵された内枠と、筒状に形成され、前記内枠が内接する外枠とを備え、前記切梁ジャッキの外周は前記内枠と離間しており、前記内枠と前記外枠は前記切梁ジャッキの伸縮に伴って前記切梁軸方向の相反する方向にスライドし、かつ前記切梁に作用する曲げ力とせん断力を前記内枠と前記外枠との当接面で伝達するように設置されていることを特徴とする切梁ジャッキ設置ボックス。 A strut jack installation box containing a strut jack that expands and contracts in the axial direction of a strut to apply an axial force to the strut , the inner frame being formed in a tubular shape and containing the strut jack. and an outer frame which is formed in a cylindrical shape and in which the inner frame is inscribed, the outer periphery of the strut jack is separated from the inner frame, and the inner frame and the outer frame extend and contract the strut jack. It is installed so as to slide in opposite directions of the strut axial direction and transmit the bending force and shear force acting on the strut through the contact surface between the inner frame and the outer frame. A strut jack installation box characterized by: 請求項１記載の切梁ジャッキ設置ボックスにおいて、前記内枠と前記外枠との当接面に摩擦低減材が介在されていることを特徴とする切梁ジャッキ設置ボックス。 2. The box for installing a beam jack according to claim 1, wherein a friction reducing material is interposed between the contact surfaces of said inner frame and said outer frame. 切梁と、前記切梁の軸方向に伸縮して前記切梁に軸力を導入する切梁ジャッキと、前記切梁ジャッキが内蔵された切梁ジャッキ設置ボックスを備えてなる山留切梁であって、前記切梁ジャッキ設置ボックスは、筒状に形成され、前記切梁ジャッキが内蔵された内枠と、筒状に形成され、前記内枠が内接する外枠とを備え、前記切梁ジャッキの外周は前記内枠と離間しており、前記内枠と前記外枠は前記切梁ジャッキの伸縮に伴って前記切梁軸方向の相反する方向にスライドし、かつ前記切梁に作用する曲げ力とせん断力を前記内枠と前記外枠との当接面で伝達するように設置されていることを特徴とする山留切梁。 An earth retaining strut comprising a strut, a strut jack that expands and contracts in the axial direction of the strut to apply an axial force to the strut, and a strut jack installation box in which the strut jack is built. The strut jack installation box is formed in a tubular shape and includes an inner frame in which the strut jack is built, and an outer frame formed in a tubular shape and inscribed with the inner frame. The outer periphery of the jack is separated from the inner frame, and the inner frame and the outer frame slide in opposite directions of the strut axis direction as the strut jack expands and contracts, and act on the strut. An earth retaining strut, characterized in that it is installed so that a bending force and a shearing force are transmitted by contact surfaces between the inner frame and the outer frame.
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JPH08144283A (en) * 1994-11-17 1996-06-04 Nishimatsu Constr Co Ltd Landslide protection wall timbering material
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