JP3223117U - Concrete members and joints - Google Patents

Abstract

The present invention provides a concrete member that can be reduced in weight by reducing the thickness without changing the specifications of the joint. A loop-shaped joint 20 includes a fixing start point Z22 of a plane side straight part 22 and a fixing start point Z23 of a bottom side straight part 23 with respect to a floor slab body 11 (concrete member main body). By being displaced toward the direction, the joint is inclined with respect to the flat surface portion 14 of the floor slab body as viewed from the side. The thickness of the concrete member main body is determined by the degree of inclination of the joint. [Selection] Figure 4

Description

  The present invention relates to a concrete member provided with a loop-shaped joint, and a loop-shaped joint provided in the concrete member.

  Conventionally, as a precast concrete floor slab erected on a main girder in a bridge or the like, for example, there is a concrete member described in Patent Document 1 below. This concrete member has a flat plate shape, and a loop-shaped reinforcing bar (hereinafter referred to as “loop joint”) as a joint projects from the side toward the bridge axis direction (see FIG. 1).

  In addition, there is a structure in which a loop joint projects in a vertical direction from a columnar concrete member, for example, an elevated track described in Patent Document 2 below. That is, for example, as shown in FIG. 2, there is a case where the loop joint 220 protrudes from the upper part or the lower part of the column member 210.

  Further, for example, as shown in FIG. 3, there is a case where a loop joint 320 projects from the side portion of the wall member 310.

  A joint structure is realized by overlapping the loop joints described above. For example, in the concrete member provided with the conventional loop joint shown in FIGS. 1, 2 and 3, the thickness of the concrete member is determined by the shape of the loop joint.

JP 2002-227130 A JP 2004-270150 A

  By the way, the reinforced concrete floor slab (hereinafter referred to as “RC floor slab”) of the old bridge in the erection year is designed based on the past standards and may be thinner than the thickness defined by the current standards. In such a bridge, when the floor slab is renewed for repair or the like, if the thickness of the floor slab is designed according to the current standards, the thickness of the floor slab becomes thicker than the existing floor slab. If the renewed floor slab is thicker than the existing floor slab, the dead load will increase, and the existing steel girder and substructure will be burdened. Therefore, in the RC floor slab renewal work, a lighter floor slab is required for renewal from the viewpoint of limiting the load resistance of existing steel girders and substructures and ensuring the earthquake resistance of the bridge.

One way to reduce the weight of the RC floor slab is to replace it with a thin prestressed concrete floor slab (hereinafter referred to as “PC floor slab”). In the design of a PC floor slab using a loop joint, generally, the thickness of the PC floor slab is determined by the size of the loop joint. Here, a conventional loop joint will be described with reference to the drawings. FIG. 1 shows a conventional PC floor slab 110 and a loop joint 120. In FIG. 1, the bending diameter of the loop joint 120 is determined by the thickness of the reinforcing bar, and the interval between reinforcing bars facing each other in the thickness direction of the PC floor slab 110 (hereinafter, referred to as “reinforcing bar interval”) X is determined by the bending diameter. Is determined. On the other hand, the minimum cover of the reinforcing bar of the concrete member is determined in accordance with the thickness of the reinforcing bar, the type of the concrete member, the environmental conditions in which the concrete member is placed, and the like. Therefore, the thickness of the PC floor slab 110 is the reinforcing bar interval X, the cover for the reinforcing bar on the upper surface side of the PC floor slab 110 (hereinafter referred to as “floor upper cover”) X ₁ , and the lower surface side of the PC floor slab. head for reinforcement (hereinafter referred to as "floor layout paper side head".) obtained by the sum of X _2.

Thus, a design method is established for the PC floor slab 110 using the loop joint 120, and the thickness of the PC floor slab 110 depends on the specification of the loop joint 120. if the values of slab superior temporal X ₁ and floor layout paper side head X ₂ and the minimum value, it is possible to reduce the PC slab 110. However, in order to make the PC floor slab 110 thinner and lighter than that, it is necessary to change the specifications of the loop joint 120 to change the thickness and bending diameter of the reinforcing bar.

  The present invention has been proposed in view of the above circumstances. In other words, the weight can be reduced by reducing the thickness without changing the specification of the joint, the allowable range of the joint arrangement can be expanded, and an area not occupied by the joint can be secured. It is an object of the present invention to provide a concrete member that can effectively use this region and a joint that can reduce the weight of the concrete member.

  In order to achieve the above object, a concrete member according to the present invention is a concrete member in which a loop-shaped joint is provided on a side portion of a concrete member body, and the joint is viewed from the side of the concrete member body. Further, it is inclined with respect to the flat portion of the concrete member main body. Here, a concrete member is a floor slab, a wall, a pillar, etc., for example.

  The concrete member according to the present invention is characterized in that the thickness of the concrete member body is determined by the degree of inclination of the joint.

  The joint according to the present invention is a loop-shaped joint provided on the side portion of the concrete member main body, and is inclined with respect to the plane portion of the concrete member main body as viewed from the side of the concrete member main body. It is characterized by that.

In the concrete member according to the present invention, an unoccupied region between the end of the concrete member main body and the joint at the outermost end of the concrete member main body is determined according to the degree of inclination of the joint, Reinforcing bars are arranged in the unoccupied area.
The concrete member according to the present invention is a wall member or a column member.
A concrete member having a loop-shaped joint that is provided on a side portion of the concrete member main body and is inclined with respect to a plane portion of the concrete member main body as viewed from the side of the concrete member main body is connected. The concrete member connecting method includes a step of attaching one part of a guide member which is longer than the thickness of the concrete member between the joints of the first concrete member which is the existing concrete member, and the first concrete member. A step of causing the joint of the second concrete member, which is the concrete member to be coupled to the other surface, to face the other part of the guide member, and bringing the second concrete member closer to the first concrete member along the guide member And the joint of the second concrete member and the first concrete part Through a procedure for the arrangement of the said joint alternately a.

  The concrete member according to the present invention is viewed from the side of the concrete member main body, and the joint is inclined with respect to the flat portion of the concrete member main body. That is, since the joint is inclined, the vertical width occupied by the joint becomes narrow in the thickness direction of the concrete member main body, and the concrete member becomes thin accordingly. On the other hand, the reinforcing bar interval of the joint is the same as when the joint is not inclined. Therefore, based on the conventional design method, weight reduction can be implement | achieved by making a concrete member thin, without changing the specification of a coupling. Moreover, even if it is a case where a coupling with a large diameter is used, the vertical width which a coupling occupies becomes narrow in the thickness direction of a concrete member main body because the coupling inclines. Therefore, the diameter of the joint can be increased without changing the thickness of the concrete member, and the required load bearing capacity can be ensured. In addition, since the joint is inclined, a region not occupied by the joint is increased on the side surface, and this region can be used effectively.

  In the concrete member according to the present invention, the thickness of the concrete member main body is determined by the degree of inclination of the joint. That is, the greater the degree of inclination, the thinner the concrete member. Therefore, weight reduction can be realized by thinning the concrete member.

  The joint according to the present invention is inclined with respect to the flat portion of the concrete member body as viewed from the side of the concrete member body. Therefore, weight reduction can be realized by thinning the concrete member without changing the specifications of the joint.

In the concrete member according to the present invention, the non-occupied region between the end of the concrete member main body and the joint at the outermost end of the concrete member main body is determined according to the degree of inclination of the joint. Reinforcing bars can be placed.
The concrete member according to the present invention can be a wall member or a column member.
The concrete member connecting method includes a procedure for attaching one part of the guide member that is longer than the thickness of the concrete member between the joints of the first concrete member, which is an existing concrete member, and the concrete to be connected to the first concrete member. A second concrete member joint that is a member, and a second concrete member joint that is close to the first concrete member along the guide member and a procedure for causing the joint of the second concrete member that is a member to face the other part of the guide member And a procedure of alternately arranging joints of the first concrete member. That is, by connecting the first concrete member and the second concrete member by interposing the guide member, the contact between the first concrete member and the second concrete member, the joint of the first concrete member and the second concrete member Contact with the joint and contact between each concrete member and each joint are hindered. Therefore, it is possible to properly connect the concrete member while avoiding breakage.

The loop joint is enlarged and shown in the conventional PC floor slab, (a) is a front see-through view of the PC floor slab, and (b) is a side view of the PC floor slab. The column member provided with the conventional loop joint is shown, (a) is a perspective view, (b) is an AA sectional view of (c), (c) is a front view, (d) is a side view. . The wall member provided with the conventional loop joint is shown, (a) is a perspective view, (b) is a top view, (c) is a front view, (d) is AA sectional drawing of (c). . 1 is an external perspective view of a concrete member according to a first embodiment of the present invention. The external appearance of the concrete member which concerns on 1st embodiment of this invention is shown, (a) is a top view, (b) is a side view, (c) is a front view. The joint of the concrete member which concerns on 1st embodiment of this invention is expanded and shown, (a) (c) (e) is a front transparent figure of a concrete member, (b) (d) (f) is a concrete member FIG. It is an expanded side view of the concrete member which concerns on the modification of 1st embodiment of this invention. A part of construction process of the concrete member which concerns on 1st embodiment of this invention is shown, (a) and (b) are construction process explanatory drawings when a concrete member is used as a floor slab. It is construction process explanatory drawing by which a part of construction process of the floor slab by the concrete member connection method which concerns on 1st embodiment of this invention was shown. It is construction process explanatory drawing by which a part of construction process of the floor slab by the concrete member connection method which concerns on 1st embodiment of this invention was shown. In the state where the concrete member according to the first embodiment of the present invention is connected, the joint is shown enlarged, (a) (c) (e) is a front perspective view of the concrete member, (b) (d) ( f) is a side view of the concrete member as viewed from the filling portion. The external appearance of the concrete member which concerns on 2nd embodiment of this invention is shown, (a) is a perspective view, (b) is a top view, (c) is a front view, (d) is AA cross section of (c). FIG. The external appearance of the concrete member which concerns on 3rd embodiment of this invention is shown, (a) is a perspective view, (b) is AA sectional drawing of (c), (c) is a front view, (d) is a side view FIG.

  Below, the concrete member connection method is demonstrated based on drawing together with the concrete member and joint which concern on 1st embodiment of this invention. 4 and 5 show the appearance of the floor slab 10 as a concrete member. In the following description, assuming that the bridge is used for a bridge, the bridge axis direction is a side. The direction perpendicular to the bridge axis is the longitudinal direction and the front or back. The vertical direction is the upper and lower sides in the thickness direction, the upper surface is the plane, and the lower surface is the bottom surface. In the following, a floor slab is described as an example of a concrete member, but the concrete member of the present invention is not limited to a floor slab, and includes block-shaped precast concrete in general. In addition, since the cast-in-place concrete and precast concrete may be joined, the concrete member includes the cast-in-place concrete in this case.

  The floor slab 10 is precast concrete, and as shown in FIGS. 4 and 5, a plurality of joints 20 are attached to both side portions 12 of the floor slab body 11 formed in a substantially rectangular flat plate shape. . As shown in FIG. 5C, both side portions 12 of the floor slab body 11 are inclined in the thickness direction, and project toward the side as going downward. The both side portions 12 may be straight without being inclined in the thickness direction. Moreover, the lower part of the floor slab main body 11 protrudes toward both sides rather than the side part 12, and what is called a jaw part may be formed.

As shown in FIGS. 4 and 5, the joint 20 has a loop shape and is arranged in the longitudinal direction of the floor slab body 11. More specifically, the joint 20 is a U-shaped reinforcing bar, and straight plane-side straight portions 22 and bottom-side straight portions 23 extend in parallel from both ends of the curved curved portion 21. A part of both the straight portions 22 and 23 is embedded and fixed in the floor slab body 11. As shown in FIG. 5 (b), the joint 20, and a fixing start part _{Z 23} of the fixing starting portion _{Z 22} and the bottom side straight portion 23 of the flat side straight portion 22 with respect to the floor plate body 11, the side 12 The joint 20 is inclined with respect to the flat surface portion 14 (or the bottom surface portion 15) of the floor slab body 11 when viewed from the side. In other words, as shown in FIG. 4, when a surface including the curved portion 21 and both straight portions 22 and 23 is an imaginary surface V in an arbitrary joint 20, the imaginary surface V and the planar portion 14 are included. And intersect. The angles θ ₁ and θ ₂ formed by the virtual plane V and the plane portion 14 are not right angles but obtuse or acute angles. Therefore, as shown in FIG. 5A, the bottom surface side straight portion 23 of the joint 20 is visible when viewed from the plane.

  In the floor slab 10 configured as described above, the thickness of the floor slab body 11 is determined by the degree of inclination of the joint 20. Here, the relationship between the thickness of the floor slab body 11 and the degree of inclination of the joint 20 will be described with reference to the drawings. FIG. 6 is an enlarged view of the joint 20 in various floor slabs 10 having different degrees of inclination of the joint 20.

  As shown in FIG. 6, in the joint 20, the diameter of a circle inscribed in the bending portion 21 (hereinafter referred to as “inscribed circle diameter”) is D. In accordance with the degree of inclination of the joint 20, the projected reinforcing bar interval Y (excluding the thickness of the reinforcing bar) projected in the longitudinal direction increases or decreases, and thereby the thickness of the floor slab 10 is determined. As shown in FIGS. 6A and 6B, for example, when the degree of inclination is 75 degrees, the projected reinforcing bar interval Y when the inscribed circle diameter D is 1 is about 0.96, It is smaller than the inscribed circle diameter D. The thickness of the reinforcing bar, the floor cover upper cover and the floor cover lower cover are added to the projected reinforcing bar interval Y, and the thickness T of the floor slab 10 is approximately compared to the case where the joint 20 is not inclined. 2% thinner.

  As shown in FIGS. 6C and 6D, for example, when the degree of inclination is 60 degrees, the projected reinforcing bar interval Y when the inscribed circle diameter D is 1 is about 0.84, It is smaller than the inscribed circle diameter D. The thickness of the reinforcing bar, the floor cover upper cover and the floor cover lower cover are added to the projected reinforcing bar interval Y, and the thickness T of the floor slab 10 is approximately compared to the case where the joint 20 is not inclined. 8% thinner.

  As shown in FIGS. 6E and 6F, for example, when the degree of inclination is 45 degrees, the projected reinforcing bar interval Y when the inscribed circle diameter D is 1 is about 0.66, It is smaller than the inscribed circle diameter D. The thickness of the reinforcing bar, the floor cover upper cover and the floor cover lower cover are added to the projected reinforcing bar interval Y, and the thickness T of the floor slab 10 is approximately compared to the case where the joint 20 is not inclined. 17% thinner.

  As described above, the floor slab body 11 is formed thinner as the degree of inclination of the joint 20 increases. When the degree of inclination of the joint 20 increases, the floor slab body 11 forms a non-occupied region that is not occupied by the joint 20 in the side portion 12. Here, the non-occupied region will be described with reference to the drawings. FIG. 7 shows an unoccupied area.

  As shown in FIG. 7, when the joint 20 is inclined, the side portion 12 is spaced from the longitudinal end of the floor slab body 11 and the joint 20 at the extreme end in the longitudinal direction. The unoccupied region 13 that is a region not occupied by the joint 20 is formed. In the unoccupied region 13, for example, a reinforcing bar 16 is arranged. The width of the unoccupied region 13 changes according to the degree of inclination. FIG. 7A corresponds to the floor slab 10 of FIGS. 6C and 6D, and FIG. 7B corresponds to the floor slab 10 of FIGS. 6E and 6F.

  Next, as a concrete member connection method of the present embodiment, a floor slab erection method in the case of laying the floor slab 10 will be described with reference to the drawings. 8 to 11 show the construction process by the floor slab erection method.

  As shown in FIG. 8, the floor slab 10 is installed on the main beam 1 and arranged in the bridge axis direction. There are various methods of bringing the second floor slab 10b connected to the first floor slab 10a close to the first floor slab 10a already installed on the main beam 1. For example, as shown in FIG. 8 (a), after the second floor slab 10b is placed on the main girder 1, the second floor slab 10b is slid along the main girder 1 in the bridge axis direction. There is a method of bringing it close to the first floor slab 10a. On the other hand, as shown in FIG. 8B, when the second floor slab 10b is floated and the second floor slab 10b is lowered, there is a method of overlapping the joint 20b on the joint 20a of the first floor slab 10a. . However, even if it is which method, when each floor slab 10a, 10b, each joint 20a, 20b, each floor slab 10a, 10b and each joint 20a, 20b contact, each floor slab body 11 and joint 20a and 20b may be damaged.

  Therefore, in the floor slab erection method, as shown in FIG. 9, a plate member 30 as a guide member is used. The plate member 30 is substantially rectangular, is longer than the thickness of the floor slabs 10a and 10b, is thinner than the interval between the joints 20a and 20b, and is shorter than the length of the joints 20a and 20b. The plate member 30 has a lower part 32 as one part below the half and an upper part 31 as the other part above the half. The plate member 30 is made of a material with less friction and less resistance due to contact with the joints 20a and 20b, or is subjected to such processing. Note that the guide member is not limited to a rectangular shape, for example, a rectangular shape. The shape may be rounded, rounded, oval, or the like.

  First, the lower part 32 of the plate member 30 is attached between the joints 20a of the first floor slab 10a, and the plate member 30 is leaned against the joint 20a. Next, the upper part 31 of the plate member 30 is attached between the joints 20b of the second floor slab 10b by causing the joint 20b of the second floor slab 10b in a floating state to face the upper part 31 of the plate member 30. . In this state, the joint 20 a of the first floor slab 10 a hits the back side of the plate member 30, and the joint 20 b of the second floor slab 10 b hits the front side of the plate member 30. Finally, the second floor slab 10 b is lowered along the plate member 30. At that time, since the joints 20a and 20b of the floor slabs 10a and 10b separate the plate member 30, contact is prevented. As shown in FIG. 10, the second floor slab 10b is disposed horizontally with the first floor slab 10a, and the joints 20b of the second floor slab 10b and the joints 20a of the first floor slab 10a are alternately disposed. Is done. The plate member 30 is removed after erection.

As shown in FIG. 11, a plurality of main bars 2 are arranged orthogonal to the joints 20 a and 20 b in a state where the joints 20 a and 20 b of the floor slabs 10 a and 10 b are overlapped with each other. By placing concrete 4 on the filling portion 3, the floor slabs 10a and 10b are connected to each other through the joints 20a and 20b. The thinner the floor slabs 10a and 10b, the smaller the amount of concrete 4 to be cast. In FIG. 11, the degree of inclination of the joints 20a and 20b is represented by an angle formed by the main bar 2 and the joint 20a. However, since the main bar 2 is normally arranged horizontally, FIG. 4 and FIG. The angles θ ₁ and θ ₂ formed in (b) are not different. Therefore, the floor slabs 10a and 10b shown in FIG. 11 are the same as the floor slab 10 shown in FIG.

  As described above, the floor slab 10 and the joint 20 are configured, and a floor slab erection method using the floor slab 10 is realized. Next, the effect of this embodiment will be described.

According to this embodiment, the joint 20 includes a fixing starting portion Z ₂₃ of the fixing starting portion Z ₂₂ and the bottom side straight portion 23 of the flat side straight portion 22 with respect to the floor plate body 11, longitudinally oriented sides 12 The joint 20 is inclined with respect to the flat surface portion 14 (or the bottom surface portion 15) of the floor slab body 11 as viewed from the side (see FIG. 5B). That is, since the joint 20 is inclined, the projected reinforcing bar interval Y occupied by the joint 20 in the thickness direction of the floor slab body 11 is narrower than the inscribed circle diameter D (see FIG. 6). The floor slab 10 becomes thinner. On the other hand, the reinforcing bar interval of the joint 20 is the same as when the joint 20 is not inclined. Therefore, weight reduction can be realized by thinning the floor slab 10 without changing the specification of the joint 20 based on the conventional design method. Further, even when the joint 20 having a large diameter is used, the vertical width occupied by the joint 20 is reduced in the thickness direction of the floor slab body 11 because the joint 20 is inclined. Therefore, the diameter of the joint 20 can be increased without changing the thickness of the floor slab body 11, and a required load bearing capacity can be ensured. Furthermore, the tolerance | permissible_range of arrangement | positioning of the coupling 20 can be expanded.

  According to this embodiment, the thickness of the floor slab body 11 is determined by the degree of inclination of the joint 20. That is, as the degree of inclination of the joint 20 increases, the floor slab body 11 is formed thinner. Therefore, weight reduction can be realized by making the floor slab 10 thin. For example, compared with the case where the thickness of the joint 20 is “D19” and the degree of inclination is 90 degrees, the thickness of the joint 20 is “D22” and the degree of inclination is 55. When the angle is between 57 degrees and 57 degrees, the thickness of the floor slab body 11 is the same. That is, the joint 20 can be thickened without changing the thickness of the floor slab.

  According to this embodiment, by increasing the degree of inclination of the joint 20, the side portion 12 has a gap between the longitudinal end of the floor slab body 11 and the joint 20 at the extreme end in the longitudinal direction, An unoccupied region 13 which is a region not occupied by the joint 20 is formed (see FIG. 7). Therefore, for example, the reinforcing bars 16 can be arranged in the unoccupied region 13.

  According to this embodiment, the lower part 32 of the plate member 30 is attached between the joints 20a of the first floor slab 10a, and the plate member 30 is leaned against the joint 20a. Next, the upper part 31 of the plate member 30 is attached between the joints 20b of the second floor slab 10b by causing the joint 20b of the second floor slab 10b in a floating state to face the upper part 31 of the plate member 30. . Finally, the second floor slab 10 b is lowered along the plate member 30. At that time, since the joints 20a and 20b of the floor slabs 10a and 10b separate the plate member 30, contact is prevented. Therefore, the floor slab 10 can be appropriately installed while avoiding breakage. In addition, the thinner the floor slabs 10a and 10b, the smaller the amount of concrete 4 to be placed in the padding portion 3.

  The present invention may be configured such that the joint 41 projects from the side surface of the wall member 40 as the concrete member and joint according to the second embodiment shown in FIG. In addition, since the structure of the wall member 40 and the coupling 41 is the same as that of 1st embodiment, description is abbreviate | omitted.

  In the connection method of the second embodiment, the plate member 30 is used as in the first embodiment. In this case, one side of the plate member 30 on the front side or the rear side of the half is one part, and the other side is the other part. In addition, since the connection method is the same as that of 1st embodiment, description is abbreviate | omitted.

  The present invention may be configured such that the joint 51 projects from the upper part or the lower part of the column member 50 as the concrete member and joint according to the third embodiment shown in FIG. In addition, since the structure of the column member 50 and the coupling 51 is the same as that of 1st embodiment, description is abbreviate | omitted.

  In the connection method of the third embodiment, the plate member 30 is used as in the first embodiment. The configuration of the plate member 30 is the same as in the second embodiment. In addition, since the connection method is the same as that of 1st embodiment, description is abbreviate | omitted.

  The second embodiment and the third embodiment also have the same effects as the first embodiment.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment. The present invention can be modified in various ways without departing from the matters described in the claims of the utility model registration.

1 Main Girder 2 Main Reinforcement 3 Spacing Section 4 Concrete 10 Floor Slab (Concrete Member)
10a First floor slab (first concrete member)
10b Second floor slab (second concrete member)
11 Floor slab body (concrete member body)
DESCRIPTION OF SYMBOLS 12 Side part 13 Unoccupied area | region 14 Plane part 15 Bottom face part 16 Reinforcement 20, 20a, 20b Joint 21 Curved part 22 Plane side linear part 23 Bottom face side linear part 30 Plate member (guide member)
31 Upper part 32 Lower part 40 Wall member (concrete member)
41, 51 Joint 50 Column member (concrete member)
110 PC slab 120, 220, 320 Loop joint 210 Column member 310 Wall member D Inscribed circle diameter
T Thickness V Virtual plane X Reinforcing bar interval X ₁ floor slab upper side cover X ₂ floor slab lower side cover Y projected rebar interval Z ₂₂ , Z ₂₃ anchoring origin θ ₁ , θ ₂ angle

Claims (5)

In a concrete member provided with a loop-shaped joint on the side of the concrete member body,
Viewed from the side of the concrete member body, the joint is inclined with respect to the flat surface of the concrete member body.
A concrete member characterized by that. The thickness of the concrete member body is determined by the degree of inclination of the joint;
The concrete member according to claim 1. An unoccupied area between the end of the concrete member body and the outermost joint in the concrete member body is determined according to the degree of inclination of the joint, and a reinforcing bar is arranged in the unoccupied area. The
The concrete member according to claim 1 or 2, characterized in that A wall member or a column member,
The concrete member according to any one of claims 1 to 3, wherein the concrete member is provided. In the loop-shaped joint provided on the side of the concrete member body,
As seen from the side of the concrete member body, it is inclined with respect to the flat portion of the concrete member body.
A joint characterized by that.

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