JP5633502B2 - Wall structure - Google Patents

Description

  The present invention relates to a wall structure used as a structural member in the civil engineering / architecture field, and more particularly to a wall structure including a pile member and a sheet pile wall suitable for use as a revetment wall.

  Conventionally, a wall structure including a pile member and a sheet pile wall has been used for the purpose of making a revetment wall of a port, a river, or a road retaining wall, and as a revetment wall, a steel wall structure is mainly used. It is common to use. This wall structure includes a plurality of pile members placed on the ground at intervals, and a sheet pile wall placed on the ground so as to connect these pile members.

  A pile member may use the steel pipe sheet pile which has the main body steel pipe of a substantially circular cross section, and the pile joint fixed to the outer peripheral surface of the main body steel pipe by welding. Moreover, it is common to use the steel sheet pile wall which has steel sheet piles, such as a hat-shaped cross section, a Z-shaped cross section, and a U-shaped cross section, as a sheet pile wall. Here, a steel sheet pile with a hat-shaped cross section has a pair of flange portions provided at both ends of the web portion, an arm portion provided at one end of the flange portion, and a sheet pile joint provided at the tip of the arm portion. It means what was done. Further, the steel sheet pile having a Z-shaped cross section is provided with a portion corresponding to an arm portion of a steel sheet pile having a hat-shaped cross section at one end of a portion corresponding to one flange portion of the steel sheet pile having a hat-shaped cross section. The web part which becomes the half of the width | variety corresponding to the web part of the steel sheet pile of a hat-shaped cross section at the end is provided, and the sheet pile joint is provided at the tip of the arm part and the web part. Moreover, the steel sheet pile of a U-shaped cross section means that the sheet pile joint was provided in the front-end | tip of a pair of flange part provided in the both ends of the web part.

  When building a wall structure in consideration of economic efficiency, steel sheet piles can be driven at a lower cost than steel pipe sheet piles, so that the distance between adjacent steel pipe sheet piles is greatly increased. . The steel sheet pile wall is placed on the ground so that the adjacent steel pipe sheet piles are connected by a plurality of steel sheet piles. At this time, the steel pipe sheet pile having higher rigidity than the steel sheet pile wall will resist the earth pressure of the ground, and the steel sheet pile wall having low rigidity will function exclusively as a film structure for preventing the outflow of earth and sand. In addition, when the steel pipe sheet pile has a small diameter steel pipe sheet pile, the difference in rigidity between the steel pipe sheet pile and the steel sheet pile is reduced, and the steel sheet pile wall, which is less rigid than the steel pipe sheet pile, functions as a structure that counteracts earth pressure. Become.

  As such a wall structure, for example, a structure disclosed in Non-Patent Document 1 has been proposed. As shown in FIG. 9, the wall structure 70 disclosed in Non-Patent Document 1 is obtained by connecting a sheet pile joint 91 a of a steel sheet pile 90 having a U-shaped cross section to a pile joint 81 included in a plurality of steel pipe sheet piles 85. Built. As shown in FIG. 10, the steel pipe sheet pile 85 disclosed in Non-Patent Document 1 is provided with a pile joint 81 on the same line as the neutral shaft of the plurality of steel pipe sheet piles 85.

  When the wall structure 70 disclosed in Non-Patent Document 1 is used as a revetment wall, earth pressure acts as shown in FIG. At this time, as shown in FIG. 12 in which the X portion shown in FIG. 11 is enlarged, the earth pressure acting on the steel sheet pile 90 is pulled through the flange portion 91 having the sheet pile joint 91 a connected to the pile joint 81. Acting on the pile joint 81 from the sheet pile joint 91a.

  As shown in FIG. 12, the pile joint 81 is fixed to the outer peripheral surface 80a of the steel pipe by welding, and this welding generally uses fillet welding. Further, the tensile force A can be grasped as a resultant force of a tensile component force a1 acting in the vertical direction and a shear component force a2 acting in the horizontal direction with respect to the tangent line of the outer peripheral surface 80a passing through the fixing position of the pile joint 81. Accordingly, the welded portion 82 needs to be designed so as to be able to counter the tensile component force a1 and the shear component force a2.

  Moreover, as a structure provided with a pile member and a sheet pile wall, the structure disclosed by patent document 1 is proposed, for example. The structure disclosed in Patent Document 1 includes a plurality of steel pipe sheet piles, a pair of flange portions provided at both ends of a web portion, an arm portion provided at one end of the flange portion, and a tip of the arm portion. It connects with the some steel sheet pile of the hat-shaped cross section in which the sheet pile coupling was provided.

  The structure disclosed in Patent Document 1 is based on the premise that the structure is used as a foundation structure, and an arm having a sheet pile joint connected to the pile joint at the tip with respect to the tangent to the outer peripheral surface passing through the fixing position of the pile joint. A pile member and a sheet pile wall are connected so that a part may become substantially parallel.

ArcelorMittal (Intermediary sheet piles: triple PU18) <URL: http://www.arcelormittal.com/sheetpiling/page/index/name/tubular-piles>

JP 2007-303099 A

  However, in general, fillet welding is assumed only to withstand shearing forces acting horizontally, as shown in the road bridge specifications and explanations (steel bridge edition) published by the Japan Road Association. The current situation is that the proof stress against the tensile force acting on is not assumed.

  Therefore, in the wall structure 70 disclosed in Non-Patent Document 1, when a tensile force is applied to the welded portion 82 provided by fillet welding, stress transmission at the welded portion is unclear, and this tensile component There has been a problem that the throat thickness and the like required to counter the force a1 cannot be appropriately designed.

  For this reason, the tensile force A increases because the earth pressure shown in FIG. 11 increases, the distance between the main pipes adjacent in the wall direction increases, and the earth pressure load received once by the sheet pile wall increases. When the tensile component force a1 increases accordingly, the tensile component force a1 is superior to the actual tensile strength that cannot be expected in the design of the welded portion 82, and the welded portion 82 breaks in tension. Become. At this time, the pile joint 81 is separated from the outer peripheral surface 80a in a state where the sheet pile joint 91a is connected, and the wall body structure 70 shown in FIG. 9 always has a risk of collapsing. It was.

  Moreover, the sheet pile wall disclosed by patent document 1 has a steel sheet pile of the hat-shaped cross section in which the web part and arm part of a steel sheet pile are substantially parallel. For this reason, the structure disclosed in Patent Document 1 needs to be connected at the outermost outer periphery of the steel pipe forming the foundation structure having a polygonal cross section, and when applied to a wall, the wall thickness of the wall is It becomes large and cannot be applied when there is space restriction on the ground on the front side or the back side. In addition, when the structure disclosed in Patent Document 1 is used as a revetment wall, in order to make the tangent line and the arm portion substantially parallel to each other, a steel sheet pile is hit along the normal line serving as a waterfront line. It is necessary to install. Therefore, when the structure disclosed in Patent Document 1 is used as a revetment wall, the fixing position of the pile joint is on the normal line shown in FIG. 11, and it is difficult to fit the steel sheet pile wall inside the normal line. There was a problem.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is, in particular, in a wall body structure including a steel pipe sheet pile and a steel sheet pile wall, and a welded portion is tensile fractured. Accordingly, it is an object of the present invention to provide a wall structure having a high design reliability that prevents the pile joint from being separated from the outer peripheral surface of the main body pipe and can reliably remove the risk of collapse.

  In order to solve the above-mentioned problems, the present inventors have invented the following wall structure after intensive studies.

  The wall structure according to the first aspect of the present invention has a main body pipe and a pile joint fixed to the outer peripheral surface of the main body pipe, and is driven in a wall shape on a pile member that is driven on the ground. It has at least one sheet pile, and a sheet pile joint at a wall width direction end thereof is connected to a pile joint of the pile member, and the pile member and the sheet pile wall are The tangent line of the outer peripheral surface of the main body pipe passing through the fixing position of the pile joint and the flange portion of the sheet pile having a sheet pile joint at the end in the wall width direction at the distal end are connected so as to be substantially parallel. It is characterized by.

  A wall structure according to a second invention is characterized in that, in the first invention, the sheet pile wall has a plurality of sheet piles that are placed in a wall shape on the ground in a state of being connected via mutual sheet pile joints. To do.

  A wall structure according to a third aspect of the present invention is the first aspect or the second aspect of the present invention, wherein the pile members are placed on the ground at a distance from each other, and the sheet pile wall is a sheet pile joint at both ends in the wall width direction. Are connected to pile joints of the plurality of pile members adjacent to each other.

  The wall structure according to a fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein the pile joint is a straight line connecting a center point in a cross section of the main body pipe and a fixing position of the pile joint. An angle formed in a plan view with a neutral axis that coincides with the neutral axis of the main body tube is greater than 0 ° with respect to an intersection of the neutral axis and the outer peripheral surface on the side where the sheet pile wall is placed, It is fixed to the outer peripheral surface of the main body tube so as to be smaller than 90 °.

  A wall structure according to a fifth invention is the wall body structure according to any one of the first to fourth inventions, wherein the main body pipe is a steel pipe having a substantially circular cross section, and the sheet pile is provided at both ends of the web portion. It is a steel sheet pile with a substantially U-shaped cross section in which a sheet pile joint is provided at the tip of a pair of flange portions.

  The wall structure according to a sixth aspect of the invention is characterized in that, in any one of the first to fifth aspects of the invention, the pile joint is fixed to the outer peripheral surface of the main body pipe by welding.

  The wall structure according to a seventh aspect of the present invention is the invention according to any one of the first to sixth aspects, wherein the pile joint has a ground backed by the main body tube with respect to a neutral axis of the main body tube. It is fixed to a certain back side.

  The wall structure according to an eighth invention is the wall structure according to any one of the first to sixth inventions, wherein the pile joint is interposed through a neutral shaft of the main body pipe rather than the ground back of the main body pipe. It is fixed to the front side.

  According to the first to third inventions, the wall structure to which the present invention is applied has almost no tensile force acting in the direction perpendicular to the tangent to the outer peripheral surface of the main body pipe at the fixing position of the pile joint. Appropriate design can be performed so that only the shearing force acting in the horizontal direction with respect to the tangent can be counteracted, and the reliability of the design can be improved.

  In particular, according to the fourth invention, in addition to the effects of the first to third inventions, the wall structure to which the present invention is applied is more than the outer peripheral surface in the wall thickness direction of the main pipe that is adjacent along the wall body direction. Since the sheet pile wall can be arranged on the inner side, it is possible to apply even when there is a space limitation of the wall thickness.

  Furthermore, according to the fifth and sixth inventions, the wall structure to which the present invention is applied can be appropriately designed in addition to the effects of the first to fourth inventions. It is possible to set the welding amount, and it is possible to prevent a lot of unnecessary welding, increasing material costs and processing time, and preventing excessive welding and causing thermal deformation of the main body. Become.

  According to the seventh invention, in addition to the effects of the first to sixth inventions, the wall structure to which the present invention is applied has a sheet pile placed on the ground side. It is possible to store a sheet pile wall on the inside of a reference plane formed by a tangent line that passes through the outer peripheral surface of the adjacent main body pipe on a straight line, and construct a revetment wall by appropriately securing a normal line that becomes a shoreline. Is possible.

  According to the eighth invention, in addition to the effects of the first to sixth inventions, the wall structure to which the present invention is applied has a sheet pile joint that is pushed into the pile joint. It is possible to prevent separation from the slit.

It is a side view of the wall body structure to which this invention used as a revetment wall is applied. It is a perspective view of the wall body structure to which the present invention is applied. It is a top view of the wall body structure to which this invention is applied. It is a top view which shows the action direction of the earth pressure with respect to the wall structure to which this invention is applied. It is an enlarged plan view of a wall structure to which the present invention is applied. It is a top view of other embodiments of a wall structure to which the present invention is applied. It is a top view which shows the action direction of the earth pressure with respect to other embodiment of the wall structure to which this invention is applied. It is an enlarged plan view of other embodiment of the wall structure to which this invention is applied. It is a perspective view of the wall body structure indicated by nonpatent literature 1. It is a top view of the wall body structure indicated by nonpatent literature 1. It is a top view which shows the action direction of the earth pressure with respect to the wall body structure disclosed by the nonpatent literature 1. 2 is an enlarged plan view of a wall structure disclosed in Non-Patent Document 1. FIG.

  Hereinafter, a wall structure to which the present invention is applied will be described in detail with reference to the drawings.

  As shown in FIG. 1, the wall structure 1 to which the present invention is applied is often placed as a revetment wall at the boundary between the ground and the sea or river. As shown in FIG. 2, the wall structure 1 to which the present invention is applied includes a steel pipe sheet pile 15 as a pile member placed on the ground and a steel sheet pile wall 25 as a sheet pile wall placed on the ground. .

  The steel pipe sheet pile 15 includes a main body steel pipe 10 having a substantially circular cross section as a main body pipe, and a pile joint 11 having a C-shaped cross section fixed to the outer peripheral surface 10a of the main body steel pipe 10 by fillet welding. On the back side of the main steel pipe 10, there is a backfill ground as shown in FIG. When the pile joint 11 is fixed to the outer peripheral surface 10a of the main body steel pipe 10 by fillet welding, it is desirable to reduce the heat input of the fillet welding as much as possible in order to prevent the main body steel pipe 10 from being deformed by heat. It is desirable to be fillet welded in a pass.

  The steel pipe sheet pile 15 may use a pile made of concrete instead of the main body steel pipe 10. Further, the pile joint 11 is not limited to a C-shaped cross section, and may be any cross section as long as it can be connected to the sheet pile joint 21a. The fixing method of the pile joint 11 is not limited to fillet welding.

  The steel sheet pile wall 25 has a plurality of steel sheet piles 20 and is placed on the ground in a state where the sheet pile joints 21a of the adjacent steel sheet piles 20 are connected to each other. The steel sheet pile 20 has a U-shaped cross section by a web portion 22 and a flange portion 21, and has a sheet pile joint 21 a at the tip of a pair of flange portions 21 provided at both ends of the web portion 22.

  As shown in FIG. 3, the steel sheet pile 20 connected to the steel pipe sheet pile 15 is driven on the ground while sliding one sheet pile joint 21 a from above the main body steel pipe 10 to the pile joint 11. In addition, one sheet pile joint 21a of the adjacent steel sheet pile 20 is connected to the other sheet pile joint 21a of the steel sheet pile 20 connected to the steel pipe sheet pile 15 by sliding from above.

  FIG. 4 is a plan view showing main directions of earth pressure acting on the wall structure 1 when the wall structure 1 to which the present invention is applied is used as a revetment wall. The pile joint 11 shown in FIG. 3 is fixed to the back side, which is the ground side shown in FIG. 4, with respect to the neutral shaft formed by the plurality of main body steel pipes 10.

  As shown in FIG. 3, in the present invention, the angle α formed by the straight line connecting the center point of the main steel pipe 10 and the fixing position of the pile joint 11 and the neutral axis that coincides with the neutral axis is determined by the steel sheet pile wall 25. The pile joint 11 is fixed so as to be larger than 0 ° and smaller than 90 ° on the basis of the intersection of the neutral axis on the provided side and the outer peripheral surface 10a. FIG. 5 is an enlarged plan view of a Y portion in FIG. In the present invention, the tangent of the outer peripheral surface 10a of the main body steel pipe 10 passing through the fixing position of the pile joint 11 to the main body steel pipe 10 is orthogonal to the straight line connecting the center point of the main body steel pipe 10 and the fixing position. The pile joint 11 is fixed to the outer peripheral surface 10a of the main body steel pipe 10 by fillet welding at a position where the tangent and the flange portion 21 are substantially parallel. In addition, if the angle which this tangent and the flange part 21 make is an error within +/- 6 degree, for example, it is below the permissible rotation angle of the normal steel sheet pile 20, and is accept | permitted.

  When the wall structure 1 to which the present invention is applied is used as a revetment wall in this embodiment, earth pressure acts as shown in FIG. At this time, as shown in FIG. 5, the earth pressure acting on the steel sheet pile 20 acts on the pile joint 11 from the sheet pile joint 21 a as the tensile force B via the flange portion 21.

  As shown in FIG. 5, the tensile force B acts as a shearing force acting in the horizontal direction on the tangent line of the outer peripheral surface 10 a passing through the fixing position of the pile joint 11. For this reason, the fillet welded portion 12 can be designed to have a throat thickness or the like so as to be sufficient if only the tensile force B acting as the shearing force can be counteracted.

  Therefore, in the wall structure 1 to which the present invention is applied, the tensile force acting in the direction perpendicular to the tangent line described above hardly acts on the welded portion 12. Therefore, the wall structure 1 to which the present invention is applied can resist only the shearing force without depending on the practical tensile strength that cannot be expected in design as in the prior art shown in FIG. It becomes possible to design fillet welding of the welded portion 12. Thereby, the wall structure 1 to which the present invention is applied can prevent the pile joint 11 from being separated from the outer peripheral surface 10a due to the tensile failure of the welded portion 12, and can improve the reliability of the design. As a result, the risk of collapse of the wall structure 1 can be reliably removed.

  Moreover, as shown in FIG. 3, as one embodiment of the wall structure 1 to which the present invention is applied, the pile joint 11 has the ground shown in FIG. 4 with respect to the neutral shaft formed by the plurality of main body steel pipes 10. It is fixed to the back side. At this time, the steel sheet pile wall 25 will have the steel sheet pile 20 cast in the ground on the above-mentioned back side. For this reason, in this embodiment, the steel sheet pile wall 25 is accommodated on the inner side of the reference plane formed by the tangent line passing through the outer peripheral surface 10a of the adjacent main body steel pipe 10 on the same straight line as the normal line serving as the shoreline. It is possible to construct a revetment wall by securing a normal line that will be a waterfront line.

  FIG. 6 is a plan view showing another embodiment of the wall structure 1 to which the present invention is applied. FIG. 7 is a plan view showing the main direction of earth pressure acting on the wall structure 1 when the wall structure 1 to which the present invention is applied is used as a revetment wall in this embodiment. As shown in FIG. 6, in this embodiment, the pile joint 11 is fixed to the neutral axis formed by the plurality of main body steel pipes 10 on the front side which is the sea and river side shown in FIG. 7.

  As shown in FIG. 6, in this embodiment, the angle α formed by the straight line connecting the center point of the main body steel pipe 10 and the fixed position of the pile joint 11 and the neutral axis that coincides with the neutral axis is determined by the steel sheet pile wall 25. The pile joint 11 is fixed so as to be larger than 0 ° and smaller than 90 ° on the basis of the intersection of the neutral axis on the side to be placed and the outer peripheral surface 10a. FIG. 8 is an enlarged plan view of a portion Z in FIG. In the present invention, the tangent of the outer peripheral surface 10a of the main body steel pipe 10 passing through the fixing position of the pile joint 11 to the main body steel pipe 10 is orthogonal to the straight line connecting the center point of the main body steel pipe 10 and the fixing position. The pile joint 11 is fixed to the outer peripheral surface 10a of the main body steel pipe 10 by fillet welding at a position where the tangent and the flange portion 21 are substantially parallel. In addition, if the angle which this tangent and the flange part 21 make is an error within +/- 6 degree, for example, it is below the permissible rotation angle of the normal steel sheet pile 20, and is accept | permitted.

  In this embodiment, when the wall structure 1 to which the present invention is applied is used as a revetment wall, earth pressure acts from the direction shown in FIG. At this time, as shown in FIG. 8, the earth pressure acting on the steel sheet pile 20 acts on the pile joint 11 from the sheet pile joint 21 a as the pushing force C via the flange portion 21.

  As shown in FIG. 8, the pushing force C acts as a shearing force acting in the horizontal direction on the tangent line of the outer peripheral surface 10 a passing through the fixing position of the pile joint 11. For this reason, the fillet welded portion 12 can be designed to have a throat thickness or the like so as to be sufficient if it can counter the pushing force C acting as a shearing force.

  Therefore, in this embodiment, the wall structure 1 to which the present invention is applied has almost no tensile force acting in the direction perpendicular to the tangent line on the welded portion 12. Therefore, in this embodiment, the wall structure 1 to which the present invention is applied counteracts only the shearing force without depending on the actual tensile strength that cannot be expected in design as in the prior art shown in FIG. It is possible to design fillet welding of the welded portion 12 so that it is possible. Thereby, in this embodiment, the wall structure 1 to which the present invention is applied can prevent the pile joint 11 from being separated from the outer peripheral surface 10a due to the tensile failure of the welded portion 12, and the reliability of the design. Therefore, the risk of collapse of the wall structure 1 can be surely removed.

  In this embodiment, the sheet pile joint 21a is pushed into the pile joint 11 by the pushing force C. For this reason, the wall structure 1 to which the present invention is applied can prevent the sheet pile joint 21a from being separated from the slit of the pile joint 11 having a C-shaped cross section in this embodiment. It is possible to remove the risk of collapse without fail. In this embodiment, the flange portion 21 shown in FIG. 6 is designed to have a thickness so as not to buckle due to the pushing force C.

  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, the wall structure 1 to which the present invention is applied can be used as a harbor, river revetment wall, or road retaining wall. Moreover, when using not only as a wall body but as a foundation structure, the steel pipe sheet pile 15 and the steel sheet pile wall 25 can be used by the same structure.

  In particular, the wall structure 1 to which the present invention is applied can connect a plurality of steel sheet piles 20 to a single steel pipe sheet pile 15, or can use only one steel sheet pile 20 as a steel sheet pile wall 25. it can. When one end of the steel sheet pile wall 25 is connected to one steel pipe sheet pile 15, the other end of the steel sheet pile wall 25 that is not connected to the steel pipe sheet pile 15 can be configured to be unconstrained, or other structure. It can also be made into the structure connected with the foundation of a thing.

  In the wall structure 1 to which the present invention is applied, the steel sheet pile wall 25 is closer to the neutral axis side than the reference plane formed by the tangent line passing through the outer peripheral surface 10a of the adjacent main body steel pipe 10 on the front side or the back side described above. It is desirable to design the length of the flange portion 21 and the angle formed by the web portion 22 and the flange portion 21 so that it can be accommodated.

1: Wall body structure 10: Main body steel pipe 10a: Outer peripheral surface 11: Pile joint 12: Welded portion 15: Steel pipe sheet pile 20: Steel sheet pile 21: Flange portion 21a: Sheet pile joint 22: Web portion 25: Steel sheet pile wall B: Tensile force C: Pushing force

Claims (8)

A pile member that has a main body pipe and a pile joint fixed to the outer peripheral surface of the main body pipe,
A sheet pile wall having at least one sheet pile placed in a wall shape on the ground, the sheet pile joint at the end in the wall width direction connected to the pile joint of the pile member, and
The pile member and the sheet pile wall are a flange of the sheet pile having a tangent to an outer peripheral surface of the main body pipe passing through a fixing position of the pile joint with respect to the main body pipe, and a sheet pile joint at an end portion in the wall width direction. The wall structure is characterized in that the parts are connected so as to be substantially parallel to each other. The wall structure according to claim 1, wherein the sheet pile wall includes a plurality of sheet piles that are driven in a wall shape on the ground in a state where the sheet pile walls are connected to each other via a sheet pile joint. A plurality of the pile members are placed on the ground at intervals,
3. The wall structure according to claim 1, wherein the sheet pile wall is connected to pile joints of the plurality of pile members adjacent to each other at a sheet width joint at both ends in the wall width direction. In the pile joint, an angle formed in a plan view between a straight line connecting a center point in a cross section of the main body pipe and a fixing position of the pile joint and a neutral axis coincident with a neutral axis of the main body pipe is the neutral axis. It is fixed to the outer peripheral surface of the main body tube so as to be larger than 0 ° and smaller than 90 ° with reference to an intersection point on the side where the sheet pile wall is placed with the outer peripheral surface. The wall structure according to any one of 1 to 3. The main body pipe is a steel pipe having a substantially circular cross section,
5. The sheet pile according to claim 1, wherein the sheet pile is a steel sheet pile having a substantially U-shaped cross-section in which a sheet pile joint is provided at the ends of a pair of flange portions provided at both ends of the web portion. Wall structure described. The wall structure according to any one of claims 1 to 5, wherein the pile joint is fixed to an outer peripheral surface of the main body pipe by welding. The said pile joint is fixed to the back side with the ground which backed up the said main body pipe with respect to the neutral axis | shaft of the said main body pipe, The any one of Claims 1-6 characterized by the above-mentioned. Wall body structure. The said pile joint is fixed to the front side through the neutral axis | shaft of the said main body pipe rather than the ground which the said main body pipe was backfilled. The any one of Claims 1-6 characterized by the above-mentioned. Wall body structure.

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