JP6447199B2 - Steel cell reinforcement structure - Google Patents

Description

  The present invention relates to a steel cell reinforcing structure in which earth pressure acts in the depth direction from the back side toward the front side.

  Conventionally, steel cells and the like disclosed in Patent Documents 1 to 3 have been proposed for use in sabo dams or retaining retaining walls.

  The cell structure disclosed in Patent Document 1 is provided with a central support in the lower center of a steel cell, and the lower part of the side wall of the steel cell and the central support are connected by a plurality of reinforcing bars. A cell bottom is formed and filled with a filling material.

  The dam using the steel cell disclosed in Patent Document 2 has a plurality of rows formed by continuously arranging a plurality of cylindrical steel cells so that adjacent steel cells are in contact with the circumferential surface. And fixing the connecting material penetrating the peripheral walls of the adjacent steel cells with a fixing material, connecting the steel cells together, connecting all the steel cells together, and filling the steel cells with the filling material It is characterized by that.

  The steel cells disclosed in Patent Document 3 have a plurality of hoop bars arranged in parallel at predetermined intervals so as to have a circular shape, and a plurality of the cells fixed in parallel while being connected in the width direction along the inner peripheral surface of each hoop bar. It is formed from the made steel sheet pile.

JP 61-294014 A Japanese Patent Laid-Open No. 3-13613 JP-A 61-102911

  However, the cell structure disclosed in Patent Document 1 connects a central support provided at the lower center of a steel cell and a plurality of reinforcing bars to form a steel cell bottom at the lower side wall of the steel cell. As a result, the outflow of the filling material can be prevented and the steel cell can be reinforced to resist the fracture of the side wall to some extent, but the reinforcing bars are arranged only at the lower end of the steel cell, Since the sliding surface of the material and the reinforcing bar do not intersect, there is a problem that the effect of shear reinforcement of the filling material cannot be obtained.

  Moreover, the dam using the steel cell disclosed in Patent Document 2 is provided with H-shaped steel on the inner peripheral surface of the upper end portion of the steel cell, and is disposed at the center of the upper end portion and the lower end portion of the steel cell. The steel cell is reinforced by connecting the angle ring and a plurality of reinforcing bars, but the reinforcing bars are arranged only at the upper and lower ends of the steel cell. There is a problem that the effect of shear reinforcement of the filling material cannot be obtained.

  Further, in the steel cell disclosed in Patent Document 3, in order to improve workability in a mountainous area or the like, a hoop bar is installed in a cylindrical shape in advance at a place where the steel cell is installed, and the hoop bar is guided (guided). The steel sheet piles are fixed side by side as the frame), but no reinforcing bars are placed inside the steel sheet piles fixed side by side with the hoop bars as a guide, so that the shear reinforcement effect of the filling material is obtained. There was a problem that could not.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to prevent the filling of steel cells due to earth pressure acting from the back side to the front side. An object of the present invention is to provide a steel cell reinforcing structure capable of suppressing shear fracture.

The steel cell reinforcing structure according to the first invention is a steel cell reinforcing structure in which earth pressure acts in the depth direction from the back side toward the front side, and a substantially hollow inner space is formed. A cell body, a filling provided in the inner space, and one or a plurality of shear reinforcements embedded in the filling, wherein the earth pressure is applied to the cell body. Sometimes it is arranged at a predetermined distance from the lower end of the cell body as straddling the sliding surface formed in the filling , and the shear reinforcement is in the height direction with the side wall of the cell body. The distance L in the height direction from the lower end portion of the cell main body is arranged so as to be substantially orthogonal to each other in relation to the inner diameter D of the cell main body and the internal friction angle φ of the filling (1 ) Satisfying the relationship defined by the formula .

  The steel cell reinforcing structure according to a second aspect of the present invention is the first aspect of the invention, wherein the shear reinforcement is arranged at both ends on the back side and the front side in the depth direction, In order to suppress the movement of both ends, a resistance member is provided on one or both of the both ends.

  The steel cell reinforcing structure according to a third aspect of the present invention is the first or second aspect of the invention, wherein the shear reinforcing material has both end portions disposed on the back side and the front side in the depth direction, One or both of the both end portions are connected to the side wall of the cell main body to suppress the movement of the both end portions inside.

  The steel cell reinforcing structure according to a fourth aspect of the present invention is the steel cell according to any one of the first to third aspects, wherein the shear reinforcing material is substantially parallel in the plane direction to the load direction of earth pressure acting in the depth direction. Or at an inclination angle within 45 ° in the plane direction.

  The steel cell reinforcement structure according to a fifth aspect of the present invention is the steel cell according to any one of the first to fourth aspects, wherein the plurality of shear reinforcement members have a center point of the cell body formed in a substantially circular shape in a planar direction. Each end part is arrange | positioned substantially equally in the circumferential direction of the said cell main body, without passing.

  A steel cell reinforcement structure according to a sixth aspect of the present invention is the structure according to any one of the first to fifth aspects, wherein the plurality of shear reinforcement members are connected to each other and integrated from above. It is characterized by being dropped into the inner space.

  In the steel cell reinforcing structure according to a seventh aspect of the present invention, in any one of the first to sixth aspects, the shear reinforcing material is formed in a ring shape on a protruding member provided on a side wall of the cell body. In order to lock both ends, the cell body is dropped into the inner space from above.

In the steel cell reinforcing structure according to an eighth aspect of the present invention, in any one of the first to seventh aspects, the separation distance L is at a position where Hv / 5 = (D · cosφ) / 10 is a lower limit. It is characterized by. Here, Hv: the height of the vertex of the sliding surface.

  The steel cell reinforcing structure according to a ninth aspect of the present invention is any one of the first to eighth aspects, wherein the shear reinforcing material is disposed so as to be substantially orthogonal to the side wall of the cell body in the height direction, The distance L in the height direction from the lower end of the cell body satisfies the relationship defined by the following equation (2) in relation to the inner diameter D of the cell body.

  The steel cell reinforcing structure according to a tenth aspect of the present invention is characterized in that, in any one of the first to ninth aspects, a wire rod or a bar steel is used as the shear reinforcing member.

According to the first to tenth aspects of the invention, the one or more shear reinforcements straddle the slip surface formed in the middle when the earth pressure is applied to the cell body, and the height from the lower end of the cell body is high. By being arranged at a predetermined separation distance in the vertical direction, the shear reinforcement material resists relative movement in the depth direction of the filling with the slip surface as an interface, and the filling shear It becomes possible to prevent destruction. In particular, the separation distance from the lower end of the cell main body satisfies the relationship defined by the above formula (1) in relation to the inner diameter of the cell main body and the internal friction angle of the filling, so that the shear reinforcement material The position to be disposed across the slip surface is easily obtained, and the layout design of the shear reinforcement can be easily and accurately implemented.

  In particular, according to the second invention and the third invention, both ends of the shear reinforcement are connected to the side walls of the cell body, or the resistance member is fixed to each of both ends of the shear reinforcement, Movement in the depth direction is suppressed at both ends of the shear reinforcement, and resistance to the pulling force acting on the shear reinforcement due to the relative movement of the filling with the sliding surface as the interface, shearing of the filling It becomes possible to prevent destruction reliably.

  In particular, according to the third invention, both ends of the shear reinforcement material are restrained by the side walls and resist the pulling force, so that the movement of the both ends of the shear reinforcement material is strongly restricted, and thus acts on the shear reinforcement material. Since the cell body side wall is restrained by the shear reinforcement and expansion deformation that expands in the circumferential direction of the cell body side wall is suppressed, It becomes possible to prevent the side wall of the main body from being broken.

  In particular, according to the fourth invention, the one or more shear reinforcements are substantially parallel in the plane direction to the load direction of earth pressure acting in the depth direction, or an inclination angle within 45 ° in the plane direction. By using the shear reinforcement material arranged along the direction in which the filling is relatively moved with the sliding surface as an interface, it is possible to efficiently prevent the breaking of the filling.

  In particular, according to the fifth invention, both end portions of each of the plurality of shear reinforcement members are arranged substantially evenly in the circumferential direction of the cell body, so that the side walls of the cell body are evenly circumferentially provided by the shear reinforcement material. Since it is restrained and expansion deformation that spreads in the circumferential direction of the side wall of the cell body is uniformly suppressed, it becomes possible to reliably prevent the side wall of the cell body from breaking, and a plurality of shear reinforcements However, since it is arranged without passing through the center point of the cell body, it is possible to arrange a plurality of shear reinforcement members without interfering with each other as much as possible without arranging the positions in the height direction to be different from each other. Thus, it becomes possible to provide a greater number of shear reinforcements in the range of a predetermined separation distance in the height direction.

  In particular, according to the sixth invention, since the plurality of shear reinforcements can be dropped together by connecting the plurality of shear reinforcements to each other, the plurality of shear reinforcements are It becomes possible to shorten the construction time for placing, and since the shear reinforcement material is dropped into the inner space of the cell body after the construction of the side wall of the cell body, the shear reinforcement material and the side wall of the cell body Are not necessarily required to be constructed at the same time, and the degree of freedom in the construction work of the cell body can be improved.

  In particular, according to the seventh invention, the projecting member provided on the side wall of the cell body is configured to lock both ends of the ring-shaped shear reinforcement material from above the cell body to the inner space. By dropping the reinforcing material, it is possible to easily and accurately carry out the joining work for connecting the both ends of the shear reinforcing material to the side wall of the cell main body as compared with the joining method by bolts or welding.

In particular, according to the eighth invention, the separation distance L from the lower end portion of the cell body is smaller than the vertex height Hv of the sliding surface, and the shear reinforcement is reliably separated from the lower end portion of the cell body, and shearing is performed. The reinforcing material is disposed across the sliding surface. The separation distance L is desirably a position with Hv / 5 = (D · cosφ) / 10 as a lower limit .

  In particular, according to the ninth invention, the separation distance from the lower end of the cell body satisfies the relationship defined by the above equation (2) in relation to the inner diameter of the cell body, so that the shear reinforcement material slips. The position to be arranged across the surface is easily obtained without depending on the properties of the filling, and the design of the arrangement of the shear reinforcement can be performed more easily and accurately.

It is a perspective view which shows the bank protection in which the reinforcement structure of the steel cell to which this invention is applied is used. It is a side view which shows the revetment where the reinforcement structure of the steel cell to which this invention is applied is used. (A) is a top view which shows the cell main body of the reinforcement structure of the steel cell to which this invention is applied, (b) is the side view. It is a side view which shows the shear fracture | rupture of filling in the reinforcement structure of the steel cells to which this invention is applied. It is a top view which shows the fracture | rupture of the side wall of a cell main body in the reinforcement structure of the steel cells to which this invention is applied. (A) is a top view which shows the reinforcement structure of the steel cell to which this invention is applied, (b) is the side view. (A) is a side view showing a shear reinforcement material inclined in a steel cell reinforcement structure to which the present invention is applied, (b) is a side view showing a shear reinforcement material to which a resistance member is fixed, (C) is a side view showing a shear reinforcing material capable of ensuring sufficient shear resistance only by peripheral friction. (A) is an expanded side view which shows the shear reinforcement material connected with the side wall of the cell main body by the reinforcement structure of the steel cell to which this invention is applied, (b) is the shear reinforcement material to which the resistance member was fixed. FIG. (A) is a steel cell reinforcing structure to which the present invention is applied, and is a shear reinforcing material arranged substantially parallel to the direction of load of earth pressure in the plane direction or at an inclination angle of 45 ° or less in the plane direction. (B) is the side view. It is a top view which shows the shear reinforcement material arrange | positioned substantially equally in the circumferential direction of a cell main body, without passing the center point of a cell main body by the reinforcement structure of the steel cells to which this invention is applied. In the steel cell reinforcement structure to which the present invention is applied, the inclination angle is 45 ° in the plane direction with respect to the load direction of the earth pressure substantially uniformly in the circumferential direction of the cell body without passing through the center point of the cell body. It is a top view which shows the shear reinforcement material arrange | positioned by. (A) is a top view which shows the some shear reinforcement material mutually integrated by the reinforcement structure of the steel cell to which this invention is applied, (b) is dropped into the inner space part from the upper direction of a cell main body. It is a side view which shows the shearing reinforcing material. It is an expanded side view which shows the shear reinforcement which the both ends formed in the ring shape at the protrusion member provided in the side wall of the cell main body by the reinforcement structure of the steel cell to which this invention is applied are latched. It is a side view which shows the vertex height of the slip surface of a filling in the reinforcement structure of the steel cell to which this invention is applied. It is a graph which shows the relationship between the vertex height of a sliding surface, and the internal diameter of a cell main body in the reinforcement structure of the steel cells to which this invention is applied.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the reinforcement structure 1 of the steel cells to which this invention is applied is demonstrated in detail, referring drawings.

  As shown in FIG. 1, a steel cell reinforcing structure 1 to which the present invention is applied is generally constructed on a seabed ground or the like, and is introduced into a cell body 2 of a steel cell used as a revetment 8, a quay wall or the like. Will be.

  The revetment 8 includes, for example, a plurality of cell bodies 2 arranged in the width direction X on the seabed ground, and each cell body 2 extending in the height direction Y from the seabed ground, It is provided so as to separate the boundary with the land side 82 such as existing ground or back ground.

  As shown in FIG. 2, the revetment 8 has a front side A in the depth direction Z as a water area side 81 such as the ocean, and a back side B in the depth direction Z as a land area side 82 such as the ground. In the depth direction Z, the ground water pressure and earth pressure P act on the cell body 2 of the steel cell from the land side 82 toward the front side A from the back side B.

  The revetment 8 is a structure that bears horizontal loads such as groundwater pressure and earth pressure P acting on each cell body 2 mainly from the land area side 82 on the back side B. It resists against the load in the horizontal direction such as the pressure P by the dead weight of the filling 3.

  A steel cell reinforcing structure 1 to which the present invention is applied includes a cell body 2 in which a substantially hollow inner space 20 is formed, and a filling of sand or the like provided by filling the inner space 20 of the cell body 2. 3 and one or a plurality of shear reinforcements 4 embedded in the filling 3 in the inner space 20 of the cell body 2.

  In the steel cell reinforcing structure 1 to which the present invention is applied, the filling 3 is filled in the inner space 20 of the cell body 2 and a concrete lid or the like is installed on the filling 3 so that the filling 3 is high. The filling 3 is held by the side wall 21 of the cell body 2 so as to be self-supporting in the vertical direction Y.

  As shown in FIG. 3A, the cell main body 2 is constructed with a substantially cylindrical side wall 21 by combining a plurality of steel segments such as a steel plate or a steel sheet pile. The cell main body 2 is formed in a substantially circular shape in the planar direction by forming a substantially hollow inner space 20 inside the side wall 21 surrounded by a substantially cylindrical shape.

  For example, the cell body 2 has a thickness t of the side wall 21 of about 8 mm to 17 mm. The cell main body 2 is formed in a substantially circular shape in the planar direction. For example, the substantially circular inner diameter D is about 20 m to 30 m, and the substantially central position in the planar direction of the cell main body 2 formed in a substantially circular shape. Becomes the center point C. As shown in FIG. 3B, the cell body 2 has a height of about 5 m to 20 m in the height direction Y, for example, from the lower end 2 a in the height direction Y to the upper end 2 b of the side wall 21 of the cell body 2. Dimension H.

  As shown in FIG. 4A, a horizontal load such as groundwater pressure or earth pressure P acts on the cell body 2 from the land region side 82 on the back side B. When the horizontal load due to earth pressure P or the like becomes a predetermined magnitude, the cell body 2 has a side wall 21 extending from the lower end 2a to the upper end 2b of the cell body 2 as shown in FIG. It is displaced so as to tilt from the back side B toward the front side A.

  For the filling 3, sand, crushed stone, or the like is used. The filling 3 is displaced so that the side wall 21 of the cell body 2 tilts from the back side B toward the front side A, so that the back side B and the front side A of the cell body 2 A sliding surface S that is inclined in the height direction Y and extends in the depth direction Z from the lower end 2 a of the side wall 21 is formed.

  The sliding surface S extends from the lower end portion 2a of the back surface B of the side wall 21 of the cell body 2 toward the front side A in the depth direction Z, and the front surface of the side wall 21 of the cell body 2. The main sliding surface S2 extends from the lower end 2a of the side A toward the back side B in the depth direction Z, and each of the receiving side sliding surface S1 and the main sliding surface S2 is in the height direction Y. Stretched upward and inclined.

  The sliding surface S extends from the lower end portion 2a of the side wall 21 on the back side B by gradually increasing the tilting displacement of the side wall 21 of the cell body 2 due to an increase in the horizontal load due to the earth pressure P or the like. The passive side sliding surface S1 and the main side sliding surface S2 extending from the lower end 2a of the side wall 21 on the front side A extend in the depth direction Z in the inner space 20 of the cell body 2 so as to intersect each other. Stretch sequentially.

  As shown in FIG. 4 (c), the sliding surface S has a substantially triangular cross-sectional shape in the height direction Y, as the passive sliding surface S1 and the primary sliding surface S2 extend in the depth direction Z. And intersect with each other at a substantially triangular apex V. The slip surface S is formed in a substantially triangular cross section in the height direction Y, so that the filling 3 is divided by the substantially triangular inner region R1 and outer region R2.

  The sliding surface S divides the filling 3 filled in the inner space 20 of the cell body 2 into a substantially triangular inner region R1 and an outer region R2 in the height direction Y, and the inner region R1 and the outer region R2 are separated from each other. At the boundary with the region R2, an interface is formed between the filling 3 in the inner region R1 and the filling 3 in the outer region R2.

  The filling 3 has an interface formed by the sliding surface S and is divided in the height direction Y between the inner region R1 and the outer region R2, so that the filling 3 of the outer region R2 becomes the filling 3 of the inner region R1. Relative to the depth direction Z. When the interface is formed by the sliding surface S, the filling force 3 suddenly decreases in resistance to horizontal loads such as earth pressure P.

  Thus, the fact that an interface due to the sliding surface S is formed in the filling 3 and the resistance of the filling 3 to a horizontal load such as earth pressure P rapidly decreases is called shear failure of the filling 3.

  The cell body 2 holds the filling 3 filled in the inner space 20 of the cell body 2 so as to be self-supporting in the height direction Y. As shown in FIG. When the inner space portion 20 is filled, at each position in the circumferential direction W, the side wall 21 of the cell body 2 receives the internal pressure N from the filling 3 in a direction substantially orthogonal to the side wall 21 in the planar direction.

  At this time, the side wall 21 of the cell body 2 bears the internal pressure N received from the filling 3 at each position in the circumferential direction W as a tensile force T directed in the tangential direction of the substantially circular side wall 21. By T, the side wall 21 expands and deforms in the circumferential direction W so as to expand from the position E in the state before expansion. As shown in FIG. 5 (b), the cell main body 2 is expanded at the time when the expansion deformation of the side wall 21 increases as the internal pressure N increases and the tensile force T exceeds the tensile strength of the side wall 21. It breaks in the circumferential direction W.

  At this time, when the tensile force T exceeds the tensile strength of the side wall 21 of the cell body 2, the side wall 21 breaking in the circumferential direction W is referred to as breaking of the side wall 21 of the cell body 2.

  When the side wall 21 of the cell main body 2 breaks, the cell main body 2 causes the filling 3 filled in the inner space 20 of the cell main body 2 to flow out to the outside. The cell main body 2 may collapse due to the load.

  The steel cell reinforcing structure 1 to which the present invention is applied is used to prevent the shearing of the filling 3 and the side wall 21 of the cell body 2 from being broken, as shown in FIG. The part 20 is provided with one or a plurality of shear reinforcements 4.

  In the steel cell reinforcing structure 1 to which the present invention is applied, one or a plurality of shear reinforcing materials 4 straddle the sliding surface S formed in the filling 3 when earth pressure P acts on the cell body 2. The cell body 2 is disposed at a predetermined distance L from the lower end 2a of the cell body 2 in the height direction Y.

  As the shear reinforcement member 4, a wire rod such as a steel wire or a steel bar such as a reinforcing bar is used. The shear reinforcement 4 is not limited to this, and a section steel such as a grooved steel or an H-section steel having high cross-sectional rigidity, a small diameter steel pipe, a steel plate with a small plate width, or the like may be used.

  As shown in FIG. 6A, the shear reinforcing material 4 is provided with, for example, three steel bars extending in the depth direction Z, and as shown in FIG. All are arranged across the slip surface S. The shear reinforcement material 4 is a member in which at least one steel bar or the like is disposed across the sliding surface S when a plurality of steel bars or the like are provided. For example, some steel bars or the like straddle the sliding surface S. The remaining steel bars and the like may be arranged without straddling the sliding surface S.

  As shown in FIG. 6 (a), the shear reinforcement 4 is disposed substantially parallel to the plane direction with respect to the load direction of earth pressure P in which a plurality of steel bars and the like act in the depth direction Z. In the shear reinforcement member 4, a plurality of steel bars and the like extend in the depth direction Z and are arranged substantially parallel to each other in the plane direction. Also, as shown in FIG. Mounted at substantially the same position.

  The shear reinforcement member 4 is provided so as to extend in a substantially straight line shape in the depth direction Z from the back side B in the depth direction Z toward the front side A. For example, the shear reinforcing material 4 is disposed so as to extend in a substantially horizontal direction so as to be substantially orthogonal to the side wall 21 of the cell body 2 in the height direction Y. The shear reinforcement 4 is not limited to this, and is inclined in the height direction Y at a predetermined angle from the horizontal direction substantially orthogonal to the side wall 21 of the cell body 2 in the height direction Y, as shown in FIG. May be arranged.

  As shown in FIG. 6 (b), the shear reinforcement 4 extends in the depth direction Z from the back side B toward the front side A, and is provided on each of the back side B and the front side A in the depth direction Z. Both end portions 4a are arranged. The shear reinforcement 4 is connected to the side wall 21 of the cell body 2 by using one or both of the end portions 4a using a predetermined joining method such as welding.

  The shear reinforcement 4 is not limited to this, and as shown in FIG. 7B, the resistance member 5 such as a steel plate uses one or both of the end portions 4a by using a predetermined joining method such as welding. It may be fixed to. At this time, one or both of the end portions 4 a of the shear reinforcement 4 are not connected to the side wall 21 of the cell body 2, but are separated from the side wall 21 of the cell body 2 or are in contact with the side wall 21. Be placed. Further, as shown in FIG. 7C, when the shear reinforcement 4 can secure sufficient shear resistance only by peripheral friction such as a steel bar, the shear reinforcement 4 is not necessarily made of steel at each end portion 4a. The resistance member 5 such as a plate made may not be fixed.

  As shown in FIG. 8, the shear reinforcing material 4 is continuously embedded across the inner region R <b> 1 and the outer region R <b> 2 of the filling 3 across the sliding surface S formed in the filling 3. The shear reinforcement 4 is embedded continuously across the sliding surface S, and bending deformation occurs due to relative movement of the filling 3 with the sliding surface S as an interface, so that the boundary between the inner region R1 and the outer region R2 Thus, the pulling force F acts.

  At this time, as shown in FIG. 8A, the shear reinforcement material 4 has both ends 4a connected to the side walls 21 of the cell body 2, and both ends 4a are restrained by the side walls 21 so that the pulling force F is increased. By resisting, the movement in the depth direction Z of the both ends 4a inside the filling 3 is suppressed. Further, as shown in FIG. 8B, the shear reinforcing material 4 has resistance members 5 fixed to both ends 4a, and the resistance members 5 embedded in the filling 3 resist the pulling force F. Thus, the movement in the depth direction Z of the both end portions 4a inside the filling 3 is suppressed.

  As shown in FIG. 6, the shear reinforcement 4 may be arranged with a plurality of steel bars or the like at substantially the same height direction Y in the plane direction, as shown in FIG. 9 (a). As shown in FIG. 9, a plurality of steel bars and the like may be arranged without being substantially parallel to each other in the plane direction and with the positions in the height direction Y being different from each other as shown in FIG. 9B. .

  For example, as shown in FIG. 9A, the shear reinforcement 4 is disposed substantially parallel to the load direction of the earth pressure P acting in the depth direction Z and 45 in the plane direction. In combination with those arranged at an inclination angle θ of less than 0 °, one or more shear reinforcements 4 are arranged substantially parallel in the plane direction or at an inclination angle θ of less than 45 ° in the plane direction. It will be a thing.

  In the shear reinforcement member 4, for example, a plurality of steel bars and the like are arranged by passing through the center point C of the cell body 2 in the plane direction. However, as shown in FIG. By arranging the positions in the height direction Y to be different from each other, a plurality of steel bars and the like are not allowed to interfere with each other.

  As shown in FIG. 10 (a), the shear reinforcement 4 does not pass through the center point C of the cell body 2 formed in a substantially circular shape in the plane direction, and both end portions of each of the plurality of shear reinforcements 4 4a may be arranged substantially evenly in the circumferential direction W of the cell body 2. At this time, as for the shear reinforcement material 4, each both-ends part 4a will be connected with the side wall 21 of the cell main body 2, However, not only this but as shown in FIG.10 (b), steel plates etc. The resistance member 5 may be fixed to each end portion 4a.

  When the both ends 4a of each of the plurality of shear reinforcements 4 are arranged substantially evenly in the circumferential direction W of the cell main body 2, at least a part of the plurality of shear reinforcements 4 is in the planar direction. May be arranged substantially in parallel or at an inclination angle θ within 45 ° in the plane direction, and as shown in FIG. Are arranged substantially evenly in the circumferential direction W, and each shear reinforcement 4 does not pass through the center point C of the cell body 2 and is flat with respect to the load direction of the earth pressure P acting in the depth direction Z. It may be arranged at an inclination angle θ within 45 ° in the direction.

  The shear reinforcement 4 is composed of a plurality of steel segments such as steel plates or steel sheet piles to construct the side wall 21 of the substantially cylindrical cell body 2 and then the inner space surrounded by the side wall 21 of the cell body 2. 20, each of both end portions 4 a is connected to the side wall 21 of the cell body 2 by a predetermined joining method such as welding.

  As shown in FIG. 12A, the shear reinforcement material 4 can be in a state in which a plurality of shear reinforcement materials 4 are connected and integrated with each other by a construction member 41 or the like. At this time, as shown in FIG. 12B, the plurality of shear reinforcement members 4 connected and integrated with each other are constructed on the side wall 21 of the substantially cylindrical cell body 2 and then above the cell body 2. It will be dropped into the inner space 20 more.

  The shear reinforcement material 4 may be provided with a fitting ring 42 formed in a ring shape such as a substantially circular shape on one or both of the both end portions 4a. At this time, the shear reinforcement 4 is positioned in the planar direction of both end portions 4a so that the fitting rings 42 at both end portions 4a are fitted into the protruding members 6 provided on the side walls 21 of the cell body 2. While aligning, it is dropped into the inner space 20 of the cell body 2.

  As the protruding member 6, for example, an angle L made of bent steel or the like is used, and a substantially L-shaped base end 6 b of the cell body 2 is formed as shown in FIG. It is fixed to the side wall 21 by a predetermined joining method such as welding. The protruding member 6 is formed with a distal end portion 6a that continuously protrudes upward from the base end portion 6b. As shown in FIG. 13B, the shear reinforcing material 4 is formed in the inner space portion 20 of the cell body 2. The fitting ring 42 is fitted into the tip 6a.

  At this time, the shear reinforcement 4 is assumed to be engaged with the protruding member 6 provided on the side wall 21 of the cell body 2 so that both ends 4a formed in a ring shape are engaged and locked from above the cell body 2. It will be dropped into the inner space 20. Note that the shear reinforcement 4 is not limited to one in which a plurality of shear reinforcements 4 are integrated, but in each of the individual shear reinforcements 4, the fitting rings 42 at both ends 4 a are locked to the protruding members 6. It can also be.

  As shown in FIG. 14, the steel cell reinforcing structure 1 to which the present invention is applied has a cross-sectional shape in the height direction Y of a substantially triangular shape, and a sliding surface S on the filling 3 of the inner space 20 of the cell body 2. Is formed. At this time, the sliding surface S formed in the filling 3 is on the back surface side B and the front surface side A in the depth direction Z with respect to the end surface S0 substantially orthogonal to the side wall 21 of the cell body 2 in the height direction Y. Inclined at a predetermined angle in the height direction Y.

  The steel cell reinforcing structure 1 to which the present invention is applied generally has a passive side extending from the lower end 2a of the side wall 21 on the back side B when the filling 3 such as sand has a predetermined internal friction angle φ. The sliding surface S1 is inclined at an angle of 45 ° −φ / 2 from the end surface S0, and the active sliding surface S2 extending from the lower end 2a of the side wall 21 on the front side A is 45 ° + φ / 2 from the end surface S0. Tilt at an angle.

  In the steel cell reinforcing structure 1 to which the present invention is applied, the passive sliding surface S1 and the primary sliding surface S2 extend in the depth direction Z and intersect each other at a substantially triangular apex V. When the sliding surface S has a predetermined vertex height Hv in the height direction Y from the lower end portion 2a of FIG. 2 and the vertex height Hv is calculated geometrically, the vertex height Hv = (D · cosφ) / 2.

  The shear reinforcement 4 is arranged so as to be substantially orthogonal to the side wall 21 of the cell body 2 in the height direction Y, and the separation distance L in the height direction Y from the lower end 2 a of the cell body 2 is The relationship between the inner diameter D and the internal friction angle φ of the filling 3 satisfies the relationship defined by the following equation (1).

  At this time, in the steel cell reinforcing structure 1 to which the present invention is applied, the separation distance L of the shear reinforcing material 4 from the lower end portion 2a of the cell body 2 is smaller than the vertex height Hv of the sliding surface S, The reinforcing material 4 is reliably separated from the lower end portion 2 a of the cell body 2, and the shear reinforcing material 4 is disposed across the sliding surface S. The separation distance L of the shear reinforcing material 4 is particularly preferably at a position where the lower limit is Hv / 5 = (D · cosφ) / 10.

  Here, the filling 3 of sand or the like has an internal friction angle φ of about 25 ° to 45 ° as an actual value, the inner diameter D of the cell body 2 is 10 m to 32.5 m, and the internal friction angle φ is 25 °. As described above, when the variable is in the range of 45 ° or less, the distribution of the vertex height Hv of the slip surface S is calculated as shown in FIG.

  In FIG. 15, the distribution of the vertex height Hv of the slip surface S is represented by plot points, and the inside of the filling 3 is only in a range exceeding D / 3 with the solid line of the vertex height Hv = D / 3 as a boundary. It can be seen that the slip surface S has a predetermined apex height Hv according to the magnitude of the friction angle φ.

  The shear reinforcement 4 is arranged so as to be substantially orthogonal to the side wall 21 of the cell body 2 in the height direction Y, and the separation distance L in the height direction Y from the lower end 2 a of the cell body 2 is In relation to the inner diameter D, the relationship defined by the following equation (2) is satisfied.

  At this time, in the steel cell reinforcement structure 1 to which the present invention is applied, the separation distance L of the shear reinforcement 4 from the lower end 2a of the cell body 2 is independent of the size of the internal friction angle φ of the filling 3. Thus, the vertex height Hv of the sliding surface S is surely smaller, and the shear reinforcement 4 is disposed across the sliding surface S. Note that the separation distance L of the shear reinforcement 4 is such that when L = 0, the shear reinforcement 4 is disposed at the lower end portion 2a of the cell body 2 and does not straddle the sliding surface S. In particular, Hv / 5 = It is desirable that the position is D / 15 as a lower limit.

  In the steel cell reinforcing structure 1 to which the present invention is applied, one or a plurality of shear reinforcing materials 4 straddle the sliding surface S formed in the filling 3 when earth pressure P acts on the cell body 2. The depth direction Z of the filling 3 having the sliding surface S as an interface as shown in FIG. 8 by being arranged at a predetermined separation distance L in the height direction Y from the lower end 2a of the cell body 2. The relative resistance of the filling 3 is resisted by the shear reinforcement 4 and maintained without reducing the resistance of the filling 3 against the horizontal load such as earth pressure P. Can be prevented.

  In the steel cell reinforcing structure 1 to which the present invention is applied, both end portions 4a of the shear reinforcing material 4 are connected to the side walls 21 of the cell main body 2, or each end portion 4a of the shear reinforcing material 4 is a resistance member. By fixing 5, the movement in the depth direction Z is suppressed at both ends 4 a of the shear reinforcement 4, and acts on the shear reinforcement 4 by the relative movement of the filling 3 with the slip surface S as an interface. It resists the pulling force F, and it is possible to reliably prevent shearing of the filling 3.

  The steel cell reinforcing structure 1 to which the present invention is applied, in particular, as shown in FIG. 8 (a), by having both end portions 4a of the shear reinforcing material 4 restrained by the side wall 21 and resisting the pulling force F, As shown in FIG. 8 (b), the movement of the both ends 4a of the shear reinforcement 4 is strongly limited as compared with the case where each of the both ends 4a of the shear reinforcement 4 is not restrained by the side wall 21. Thus, it is possible to reliably resist the pulling force F acting on the shear reinforcement 4.

  As shown in FIG. 9, the steel cell reinforcing structure 1 to which the present invention is applied has a plane direction with respect to the load direction of the earth pressure P in which one or a plurality of shear reinforcing materials 4 act in the depth direction Z. The shear reinforcement material 4 is arranged along the direction in which the filling 3 moves relative to the sliding surface S as an interface by being arranged substantially in parallel or at an inclination angle θ within 45 ° in the plane direction. This resists the shear failure of the filling 3 and can efficiently prevent the breaking of the filling 3.

  The steel cell reinforcing structure 1 to which the present invention is applied particularly has a structure in which the side walls 21 of the cell body 2 are constrained by the shear reinforcing material 4 by connecting both end portions 4 a of the shear reinforcing material 4 to the side walls 21. Thus, as shown in FIG. 5, the side wall 21 of the cell body 2 resists the tensile force T received from the filling 3 and the expansion deformation that spreads in the circumferential direction W of the side wall 21 of the cell body 2 is suppressed. It becomes possible to prevent the side wall 21 of the cell body 2 from being broken.

  In the steel cell reinforcing structure 1 to which the present invention is applied, as shown in FIG. 10, both end portions 4 a of each of the plurality of shear reinforcing materials 4 are arranged substantially evenly in the circumferential direction W of the cell body 2. Thus, the side wall 21 of the cell body 2 is uniformly restrained in the circumferential direction W by the shear reinforcement material 4, and the expansion deformation that spreads in the circumferential direction W of the side wall 21 of the cell body 2 is uniformly suppressed. It becomes possible to reliably prevent the side wall 21 of the cell body 2 from being broken.

  In the steel cell reinforcement structure 1 to which the present invention is applied, the plurality of shear reinforcements 4 are arranged without passing through the center point C of the cell body 2, so that the positions in the height direction Y are different from each other. Even if it is not arranged, a plurality of shear reinforcements 4 can be arranged without interfering with each other as much as possible, and a larger number of shear reinforcements 4 are provided in the range of a predetermined separation distance L in the height direction Y. It becomes possible.

  As shown in FIG. 12, the steel cell reinforcement structure 1 to which the present invention is applied has a plurality of shear reinforcement members 4 connected to each other by an erection member 41 or the like to be integrated. Since the reinforcing material 4 can be dropped in a lump, the construction time for arranging the plurality of shear reinforcing materials 4 can be shortened. The steel cell reinforcement structure 1 to which the present invention is applied is particularly useful when a plurality of shear reinforcement members 4 are integrated and dropped by using a steel bar or the like having high cross-sectional rigidity as the shear reinforcement member 4. If any one of the two end portions 4a is positioned, the remaining three portions are naturally positioned. Therefore, the end portions 4a of the respective shear reinforcements 4 can be easily aligned. It becomes possible.

  Further, the steel cell reinforcement structure 1 to which the present invention is applied has the shear reinforcement 4 because the shear reinforcement 4 is dropped into the inner space 20 of the cell body 2 after the side wall 21 of the cell body 2 is constructed. 4 and the side wall 21 of the cell main body 2 are not necessarily required to be constructed at the same time, and the degree of freedom in construction work of the cell main body 2 can be improved.

  The steel cell reinforcement structure 1 to which the present invention is applied is such that the protruding member 6 provided on the side wall 21 of the cell body 2 is engaged with both ends 4a of the shear reinforcement 4 formed in a ring shape. The shear reinforcement 4 is dropped into the inner space 20 from above the cell body 2 so that both ends 4a of the shear reinforcement 4 are connected to the side wall 21 of the cell body 2 as compared with a joining method using bolts or welding. It is possible to easily and accurately perform the joining operation.

  As shown in FIG. 14, the steel cell reinforcing structure 1 to which the present invention is applied has a separation distance L from the lower end 2 a of the cell body 2 such that the inner diameter D of the cell body 2 and the internal friction angle of the filling 3. By satisfying the relationship defined by the above equation (1) with respect to φ, the position where the shear reinforcement 4 is disposed across the slip surface S can be easily obtained, and the shear reinforcement 4 can be designed easily and accurately.

  In the steel cell reinforcing structure 1 to which the present invention is applied, the distance L from the lower end 2a of the cell body 2 is related to the inner diameter D of the cell body 2 and is defined by the above equation (2). When satisfied, the position at which the shear reinforcement 4 is arranged across the slip surface S is easily obtained without depending on the properties of the filling 3, and the design of the arrangement of the shear reinforcement 4 is easier. And it becomes possible to implement accurately.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

  For example, in the steel cell reinforcing structure 1 to which the present invention is applied, the cell main body 2 is formed in a substantially circular shape in the planar direction, but not limited to this. The cell body 2 may be formed in a substantially polygonal shape or the like.

DESCRIPTION OF SYMBOLS 1: Steel cell reinforcement structure 2: Cell main body 2a: Lower end part 2b: Upper end part 20: Inner space part 21: Side wall 3: Filling 4: Shear reinforcement 4a: Both ends 41: Construction member 42: Fitting ring 5: Resistance member 6: Protruding member 6a: Tip 6b: Base end 8: Revetment 81: Water side 82: Land side A: Front side B: Back side P: Earth pressure S: Slip surface W: Circumferential direction X : Width direction Y: Height direction Z: Depth direction

Claims (10)

A steel cell reinforcement structure in which earth pressure acts in the depth direction from the back side toward the front side,
A cell main body in which a substantially hollow inner space is formed, a filling filled in the inner space, and one or a plurality of shear reinforcements embedded in the filling,
The shear reinforcement is disposed across a sliding surface formed in the filling when earth pressure is applied to the cell body, and is arranged at a predetermined separation distance from the lower end of the cell body ,
The shear reinforcement is disposed so as to be substantially orthogonal to the side wall of the cell body in the height direction, and the separation distance L in the height direction from the lower end of the cell body is an inner diameter D of the cell body, A steel cell reinforcing structure characterized by satisfying a relationship defined by the following formula (1) in relation to the internal friction angle φ of the filling.

As for the shear reinforcement material, both end portions are arranged on each of the back side and the front side in the depth direction and the movement of the both end portions inside the filling is suppressed. The resistance structure is provided. The steel cell reinforcing structure according to claim 1, wherein the resistance member is provided. Both ends of the shear reinforcement material are disposed on the back side and the front side in the depth direction to suppress movement of the both ends inside the filling, and both ends of the shear reinforcing material are disposed on the side wall of the cell body. One or both of the parts are connected. The steel cell reinforcing structure according to claim 1 or 2. The shear reinforcement material is disposed substantially parallel to the load direction of earth pressure acting in the depth direction in a plane direction or at an inclination angle of 45 ° or less in the plane direction. The reinforcement structure of the steel cell of any one of -3. The plurality of shear reinforcement members are disposed substantially uniformly in the circumferential direction of the cell body without passing through the center point of the cell body formed in a substantially circular shape in the planar direction. The steel cell reinforcing structure according to any one of claims 1 to 4, wherein the steel cell reinforcing structure is provided. The plurality of shear reinforcement members are dropped into the inner space from above the cell main body in a state of being connected and integrated with each other. The reinforcing structure of the steel cell according to the item. The shear reinforcement is dropped into the inner space from above the cell body as a ring-shaped projecting member provided on the side wall of the cell body. The steel cell reinforcing structure according to any one of claims 1 to 6, wherein the steel cell reinforcing structure is provided. The steel cell reinforcing structure according to any one of claims 1 to 7, wherein the separation distance L is a position having a lower limit of Hv / 5 = (D · cosφ) / 10 .
Here, Hv: the height of the vertex of the sliding surface. The shear reinforcement material is disposed so as to be substantially orthogonal to the side wall of the cell body in the height direction, and a separation distance L in the height direction from the lower end of the cell body is equal to an inner diameter D of the cell body. The steel cell reinforcing structure according to any one of claims 1 to 8, wherein the relationship defined by the following expression (2) is satisfied.

The steel cell reinforcing structure according to any one of claims 1 to 9, wherein a wire rod or a steel bar is used as the shear reinforcing material.

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