JP6144964B2 - Temporary structure, fixing method, receiving girder for temporary structure, and laying girder for temporary structure - Google Patents

Description

  The present invention relates to a temporary structure, a fixing method, a receiving girder for a temporary structure, and a floor girder for a temporary structure.

  Conventionally, as what needs to temporarily fix a structure to a fixed structure, what is shown, for example in patent documents 1 is known. Patent Document 1 describes a girder erection device that erects a girder material on a pier. This girder installation device includes a portal-type front tower, a portal-type rear tower, a suspended girder spanned between the front tower and the rear tower, a handrail, and a traveling girder. Yes. In this girder installation device, a front tower and a rear tower are installed on each pier on which a girder is installed, and a traveling girder is installed between the piers. The newly installed girders are transported using the existing girders, and the new girders are transported to the area between the front and rear towers while passing through the inner area of the rear tower, and temporarily placed on the traveling girder. To do. After that, the new girder is lifted with the hanging girder, the traveling girder is pulled out, the hanging girder is lowered, and the new girder is installed between the piers. When the erection is completed, the front tower, the rear tower, the suspension girder, and the handbill are moved along the traveling girder to the installation place for the next girder erection. In such a girder installation device, it is necessary to temporarily fix the leg portions of the front tower and the rear tower on the bridge pier for the purpose of preventing misalignment and preventing overturning.

JP 2008-303657 A

  It is difficult to attach the legs of the front tower and rear tower of the above-mentioned girder installation device directly to the main structure for temporary fixing, which requires high-precision alignment and the like, and requires cost and time. . On the other hand, even if it is a temporary construction, it is necessary to have a seismic resistance such as slippage prevention, slippage prevention against the expected earthquake scale, and fall prevention in the slope section. It is necessary to secure it. Accordingly, there is a need for a temporary structure that can secure and secure a sufficient number of fixing points regardless of the position of the legs of the front tower and the rear tower.

  Therefore, the present invention provides a temporary structure that can be securely fixed when temporarily fixing the structure to the fixed structure, a fixing method, a receiving girder for the temporary structure, and a floor girder for the temporary structure. The purpose is to do.

  The temporary structure according to the present invention is a temporary structure provided on the fixed structure for temporarily fixing the structure to the fixed structure, and is provided on the fixed structure, A first girder extending in a direction, a first girder extending in a second direction intersecting the first direction on one side in the width direction of the first girder, and having one end fixed on the first girder, and a width of the first girder A second receiving girder extending in the second direction on the other side in the direction and having one end side fixed on the spar, and the first receiving girder and the second receiving girder are in the first direction. A first narrow portion having a narrower width than the first wide portion extending in the second direction is formed on one end portion side of the first receiving beam. A second narrow portion having a narrower width than the second wide portion extending along the second direction is formed on one end portion side of the two girder. That.

  The temporary structure according to the present invention extends in the second direction on one side in the width direction of the cross girder, and on the other side in the width direction of the cross girder, the first receiving girder whose one end is fixed on the cross girder. A second receiving girder extending in the second direction and having one end portion fixed on the spar. Further, a plurality of the first receiving digits and the second receiving digits are arranged alternately along the first direction in which the spar is extended. With such an arrangement, the receiving surfaces for receiving the structure are configured by arranging the receiving beams at predetermined intervals on both sides in the width direction of the spar. Here, a first narrow portion having a narrower width than the first wide portion extending in the second direction is formed on one end portion side fixed on the spar of the first receiving beam. The In addition, a second narrow portion having a narrower width than the second wide portion extending along the second direction is formed on one end portion side fixed on the spar of the second receiving beam. Is done. As a result, on the spar, the narrow portions of each girder are arranged adjacent to each other, while in the regions on both sides in the width direction of the spar, the width of each girder is widened by the wide portion. Thus, it is possible to secure a sufficiently large receiving surface for the structure. Thereby, when temporarily fixing a structure to a to-be-fixed structure, it can fix reliably.

  Moreover, in the temporary structure according to the present invention, at least one of the first narrow portion and the second narrow portion may extend outward from the end portion in the width direction of the spar. Thereby, a space is formed between the end portion in the width direction of the spar and the wide portion. The operator can easily perform bolting and other operations using the space (for example, to secure a space for the operator to put a hand when the receiving girder is bolted to the spar. can do).

  Moreover, in the temporary structure according to the present invention, at least one of the first receiving beam and the second receiving beam connects the narrow portion and the wide portion, and extends from the narrow portion toward the wide portion. You may have a taper part which inclines. Thereby, when bolting a receiving girder to a floor girder, the space for an operator to put a hand can be ensured. Moreover, stress can be smoothly transmitted by setting it as a taper part.

  In the temporary structure according to the present invention, the size in the width direction on the lower surface side of the spar may be larger than the size in the width direction on the upper surface side of the spar. On the upper surface side of the girder, the girder and the receiving girder are fixed with bolts or the like. On the other hand, on the lower surface side of the spar, the spar and the fixed structure are fixed by bolts or the like. Because the size in the width direction on the bottom side of the spar is larger than that on the top side, the spar is securely fixed between the spar and the structure to be fixed (for example, with a smaller number of bolts). It can be carried out. The fact that the number of bolts can be reduced is effective in the case where uneven portions (attachment plates and bolts for constructing (assembling) the structure to be fixed) interfere with the spar. On the other hand, by reducing the upper surface side of the girder, the size of the narrow portion of each girder can be reduced, and thereby the wide portion serving as the receiving surface of the structure can be increased.

  Further, in the temporary structure according to the present invention, an uneven portion formed on the fixed structure (for example, an attachment plate or a bolt when the fixed structure is constructed (assembled) is formed on the lower surface side of the spar. Further, a cutout portion may be formed so as to avoid a temporary suspension piece or a cut-out portion of a protruding hardware for setting up a safety fence. As a result, it is possible to fix the girder even in a place where the uneven portion is provided. Therefore, it is possible to suppress the restriction of the convex and concave portions on the fixed structure and to arrange the spar at a position where the temporary fixing of the structure can be surely performed.

  Further, in the temporary structure according to the present invention, a shear key may be provided at a joint portion between the spar and the receiving girder. As a result, a load acting in the shearing direction can be reliably supported between the spar and the girder. This not only improves the earthquake resistance, but also makes it possible to reduce the number of bolts, to reduce the bolt diameter, and to reduce the bolt strength to a low cost with respect to the required strength.

  The fixing method according to the present invention is a fixing method for fixing a structure to the above-described temporary structure, and the structure has a leg portion, the leg portion straddles the siding girder, and the siding girder. It may be fixed on the first receiving beam and the second receiving beam on both ends in the width direction. Thereby, the leg part of a structure can be supported by a spar, and it becomes possible to support a structure reliably.

  The temporary structure receiving girder according to the present invention is a temporary structure receiving girder provided on the fixed structure for temporarily fixing the structure to the fixed structure. A narrow portion having a narrower width than the wide portion extending in the second direction is formed on the end side fixed to the upper spar. By applying such a receiving girder to the temporary structure as described above, it is possible to secure a sufficiently large receiving surface for the structure. Thereby, when temporarily fixing a structure to a to-be-fixed structure, it can fix reliably.

  The temporary girder of the temporary structure according to the present invention is a temporary girder of a temporary structure provided on the fixed structure in order to temporarily fix the structure to the fixed structure. The size in the width direction on the lower surface side arranged on the upper side is larger than the size in the width direction on the upper surface side on which the end portion side of the receiving girder is arranged. By applying such a girder to the temporary structure as described above, the size in the width direction on the lower surface side of the girder is larger than that on the upper surface side. It is possible to securely fix the gap (for example, by making the bolt thicker). On the other hand, by reducing the upper surface side of the girder, the size of the narrow portion of each girder can be reduced, and thereby the wide portion serving as the receiving surface of the structure can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, when fixing a structure to a to-be-fixed structure, it can fix reliably.

It is the schematic block diagram which looked at the girder construction apparatus which can apply the temporary structure which concerns on embodiment of this invention from the horizontal direction (side surface). Schematic configuration diagram showing how the girders are being transported in order to construct the girders on the pier using the girder construction device (girder transportation and girder construction on the installed girders and on the pier using a carriage (Situation diagram being installed on the traveling girder of the aircraft). Schematic configuration diagram showing the situation when the traveling girder is put forward to install the girder on the pier using the girder construction device (the girder suspended from the girder suspended by the girder of the girder construction machine, It is a situation diagram when the rear end of the traveling girder is deflected and the traveling girder is fed forward by the propulsion jack in the spreader. Schematic configuration diagram showing a state when a girder material is installed on a bridge pier using a girder installation device, and the girder installation device is moved forward to the next girder installation position (the rear end of the hanging girder is vertically supported by a rear receiving car, FIG. 6 is a situation diagram when the traveling girder is on the traveling girder and the traveling girder is made a reaction force by the propulsion jack in the deeding machine and other than the traveling girder is moving forward). It is the figure (front view) which looked at the tower part and temporary structure which concern on this embodiment toward the back from the front. It is a perspective view which shows schematic structure of the temporary structure which concerns on this embodiment. It is an enlarged view when the temporary structure which concerns on this embodiment is seen toward the back from the front. It is the top view seen from the upper direction in the state which arranged the receiving beam which concerns on this embodiment. It is a perspective view of a receiving girder (52 side is the bottom side which has the insertion hole 62 of a shear key). FIG. 10A is a plan view of the receiving beam (viewed in the negative Z-axis direction), and FIG. 10B is a bottom view of the receiving beam (viewed in the positive Z-axis direction). ). 11A is a front view of the receiving beam (viewed in the positive direction of the Y axis), and FIG. 11B is a rear view of the receiving beam (viewed in the negative direction of the Y axis). ). 12A is a left side view of the receiving beam (viewed in the positive direction of the X axis), and FIG. 12B is a right side view of the receiving beam (viewed in the negative direction of the X axis). Figure). FIG. 13A is a plan view of the cross girder (viewed in the negative Z-axis direction), and FIG. 13B is a front view of the cross girder (viewed in the positive Y-axis direction). FIG. 13C is a bottom view of the spar (viewed in the positive direction of the Z axis). It is a right side view (figure seen toward the X-axis negative direction) of a siding girder. For explaining the girder according to the modified example in the case where the uneven portion formed on the fixed structure (attachment plate or bolt when constructing (assembling) the fixed structure) interferes with the cross girder FIG. It is the schematic of a receiving girder concerning a comparative example and this embodiment, Comprising: The upper stage is the top view seen from the upper side in the state which arranged the receiving girder, and the lower stage is a front view. It is a figure which shows the structure of the cross girder which concerns on a modification, FIG.17 (a) is a top view of a cross girder, FIG.17 (b) is a front view of a cross girder, FIG.17 (c) is FIG. It is sectional drawing along the XVIIc-XVIIc line | wire shown to (b).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. The terms “upper” and “lower” correspond to the upper and lower parts in the vertical direction, respectively.

  In the present embodiment, the girder installation device 1 will be described as an example of a structure to which a temporary structure is applied. First, a schematic configuration of the girder installation device 1 will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a girder installation device 1 to which a temporary structure according to the present embodiment can be applied viewed from the lateral direction (front-rear direction, that is, a direction perpendicular to the bridge axis direction in a horizontal plane). The girder construction device 1 is a device that constructs the girder material 3 sequentially in the direction A with respect to the pier 2 constructed in advance. In the following description, the front in the direction A is referred to as “front”, and the rear is referred to as “rear”. As shown in FIG. 1, the girder installation device 1 includes a main body 10 including a front tower 4, a rear tower 6, a suspension girder 7 and a hand extender 8, and a traveling girder 9. In the girder installation device 1, the hanging girder 7, the hand extender 8, and the traveling girder 9 constitute members extending in the front-rear direction. In this embodiment, a girder construction structure for laying a rail on which a train travels will be described as an example. However, the girder installation device 1 can be applied to other than the girder construction structure for a train. Further, the present invention can also be applied to a girder installation device without a traveling girder.

  The front tower 4 and the rear tower 6 are portal frame bodies. The front tower 4 is installed on the front pier 2 among the piers 2 on which the girders 3 are installed. The front tower 4 is installed on the rear pier 2 so as to face the front tower 4 in the front-rear direction. The front tower 4 is connected to the pair of leg portions 21A and 21B that are spaced apart from each other in the lateral direction and extend in the vertical direction, and the upper end of the leg portion 21A and the upper end of the leg portion 21B. A horizontal member (see FIG. 5). The lower ends of the leg portions 21A and 21B are placed on the horizontal beam of the pier 2 via the temporary structure 100 according to this embodiment (or the lower ends may float from the pier 2). The rear tower 6 also has the same configuration as the front tower 4.

  The suspension girder 7 extends in the front-rear direction, is disposed in the inner region of the front tower 4 and the inner region of the rear tower 6, and is spanned over the front tower 4 and the rear tower 6. The suspension girder 7 is supported on the front end side by the front tower 4 and supported on the rear end side by the rear tower 6, and is movable in the vertical direction. The suspension girder 7 has a function of suspending the girders 3. The suspension girder is supported by a hydraulic jack provided on the horizontal member of the rear tower 6 and a hydraulic jack provided on the horizontal member of the front tower 4, and is moved up and down by the hydraulic jack.

  The hand extender 8 extends on the pier 2 forward from the front tower 4. The traveling girder 9 extends in the front-rear direction and moves on the pier 2 in the front-rear direction via the hand extender 8. The traveling girder 9 is disposed in the inner region of the front tower 4, the inner region of the rear tower 6, and the inner side of the handrail machine 8.

  Next, with reference to FIGS. 2-4, the process of constructing the girder material 3 to the bridge pier 2 using the girder construction apparatus 1 is demonstrated. 2-4 is a schematic block diagram which shows a mode when the girder material 3 is constructed to the bridge pier 2 using the girder construction apparatus 1. FIG. Here, the case where the girders 3A are installed between the pier 2A and the pier 2B will be described as an example.

  As shown in FIG. 2 (a), a girder 3B has already been installed behind the pier 2A. The rear tower 6 is installed on the pier 2A, and the front tower 4 is installed on the pier 2B. The traveling girder 9 is installed at least between the pier 2A and the pier 2B, and extends further forward than the pier 2B. Behind the rear tower 6, preparation for transporting the newly installed girders 3A is made on the existing girders 3B. That is, the rear end of the girder 3 </ b> A is installed on the rear parent-cart 10 and the front end is installed on the front parent-cart 12. The rear parent car 11 can be separated into an upper child car 11a and a lower main car 11b. The front parent-child cart 12 can be separated into an upper child cart 12a and a lower parent cart 12b. The parent and child carts 11 and 12 can move along rails laid on the existing girders 3B.

  As shown in FIG. 2 (b), the suspended girder 7 is moved upward in order to secure a space for temporarily placing the newly installed girders 3 </ b> A on the traveling girder 9. As the parent and child carts 11 and 12 move forward, the newly installed girder 3A is carried forward. As shown in FIG. 2 (c), when the front parent-child cart 12 reaches the rear end of the traveling girder 9, the child cart 12a remains on the existing beam member 3B while supporting the newly installed beam member 3A. The vehicle leaves the master carriage 12b and moves onto the traveling girder 9. At this time, the newly installed girders 3 </ b> A pass through the inner region of the rear tower 6 and enter the region between the rear tower 6 and the front tower 4. When the newly installed girder 3A moves further forward, the rear parent / child cart 11 reaches the rear end of the traveling girder 9, and the child cart 11a supports the newly installed girder 3A while remaining on the existing girder 3B. The vehicle leaves the master carriage 11b and moves onto the traveling girder 9. As a result, the newly installed girder 3A is temporarily placed on the traveling girder 9 (the state shown in FIG. 3A).

  As shown in FIG. 3 (a), after the newly installed girders 3A are temporarily placed on the traveling girder 9, the girders 3A and the hanging girders 7 are connected, and the girders 3A become the hanging girders. 7 is suspended. After the connection is completed, the suspension girder 7 is moved upward while the newly installed girders 3A are suspended. After the newly installed girders 3A are lifted, the child carriages 11a and 12a move backward from the traveling girder 9 onto the parent carriages 11b and 12b and are connected to the parent carriages 11b and 12b.

  As shown in FIG. 3 (b), the newly installed girder 3 </ b> A is lifted and the child carriages 11 a and 12 a are lowered from the traveling girder 9, and then the traveling girder 9 is pulled out. The traveling girder 9 moves forward via the handbill 8 and is pulled out from the area between the pier 2A and the pier 2B. As shown in FIG. 3C, after the traveling girder 9 is pulled out from the region between the pier 2A and the pier 2B, the hanging girder 7 moves downward, so that the newly installed girders 3A are lowered. As shown in FIG. 4 (a), the rear end of the beam member 3A is installed on the bridge pier 2A, and the front end is installed on the bridge pier 2B, whereby the beam member 3A is interposed between the bridge pier 2A and the bridge pier 2B. Is built. When the installation of the beam member 3A is completed, the connection between the beam member 3A and the hanging girder 7 is released.

  As shown in FIG. 4 (b), the suspension girder 7 is moved upward, and the rear end portion of the suspension girder 7 is supported by the rear end carriage 13. Thus, the rear tower 6 is provisionally received by the hanging girder 7. As shown in FIG. 4C, the spreader 8, the front tower 4 and the rear tower 6 are moved forward using the traveling girder 9 as a guide. Thus, the next girder 3A is moved to a position where it is installed. Here, the next girder 3A is constructed between the pier 2C and the pier 2B, the front tower 4 is installed on the pier 2C, and the rear tower 6 is installed on the pier 2B.

  Next, the temporary structure 100, the girder 30 and the receiving girder 50 of this embodiment will be described with reference to FIGS.

  FIG. 5 is a view (front view) of the temporary structure 100 according to the present embodiment as viewed from the front to the rear. FIG. 6 is a perspective view showing a schematic configuration of the temporary structure 100 according to the present embodiment. FIG. 7 is an enlarged view when the temporary structure 100 according to the present embodiment is viewed from the front to the rear. FIG. 8 is a view seen from above in a state in which the receiving girders 50 according to the present embodiment are arranged. In the following description, the front-rear direction (bridge axial direction), which is the direction in which the front tower 4 and the rear tower 6 face each other, is referred to as the “front-rear direction D1” and is perpendicular to the front-rear direction D1 in the horizontal plane (bridge). The direction perpendicular to the axis will be referred to as “lateral direction D2”. In the present embodiment, the front-rear direction D1 corresponds to the “first direction” in the claims, and the horizontal direction D2 corresponds to the “second direction” in the claims. However, as will be described later with reference to FIG. 15, the corresponding relationship may not be established.

  The temporary structure 100 is provided on the cross beam 101 of the pier 2 in order to temporarily fix the leg portions 21A and 21B of the front tower 4 (structure) to the cross beam 101 of the pier 2. Such a temporary structure 100 can be temporarily installed on the cross beam 101 at a necessary timing, and can be removed from the cross beam 101 when unnecessary. For example, when moving the front tower 4 and the rear tower 6 as in the state shown in FIG. 4C from the state shown in FIG. When it is necessary to fix the front tower 4 and the rear tower 6 to the pier 2 as in the state of, the front tower 4 and the rear tower 6 are temporarily fixed to the pier 2 via the temporary structure 100. In the following description, the front tower 4 is described as an example of the structure, but the rear tower 6 can be temporarily fixed to the cross beam 101 of the pier 2 using the temporary structure 100 as well.

  As shown in FIG. 5 and FIG. 6, the temporary structure 100 is fixed to the plurality of spar 30 fixed on the cross beam 101 of the pier 2 and the spar 30 between the spar 30. A plurality of receiving digits 50 are provided. In the present embodiment, the roof girder 30 extends in the front-rear direction D1 and is juxtaposed at a predetermined interval in the lateral direction D2, so that the partition 102 (diaphragm) 102 in the lateral beam on the lateral beam 101 is positioned firmly. It is fixed in place. The receiving girder 50 is bridged between the girder 30 and the girder 30 so as to extend in the lateral direction D2, and is arranged in parallel at a predetermined interval in the front-rear direction D1. Both ends of the receiving girder 50 are fixed on each floor girder 30. A plurality of receiving girders 50 are arranged in both the front-rear direction D1 and the horizontal direction D2, and the upper surface of the plurality of receiving girders 50 constitutes a receiving surface for receiving the legs 21 of the front tower 4. The leg portion 21 of the front tower 4 is temporarily fixed to the receiving surface. A more detailed description of the positional relationship between the girder 50 and the spar 30 will be described later.

  First, the structure of the receiving beam 50 will be described with reference to FIGS. 9 to 12 shows a representative one of the plurality of receiving girders 50 included in the temporary structure 100, and the shape varies depending on the location in the temporary structure 100. A size receiving girder 50 is used. In the following description, XYZ coordinates are set for the receiving digit 50. FIG. 9 is a perspective view of the receiving girder 50. In addition, in order to show the structure of the insertion hole 62, in FIG. 9, the perspective view when it sees from the downward direction is shown. FIG. 10A is a plan view of the receiving girder (viewed in the negative Z-axis direction). FIG. 10B is a bottom view of the receiving girder 50 (viewed in the positive direction of the Z axis). FIG. 11A is a front view of the receiving girder 50 (viewed in the positive direction of the Y axis). FIG. 11B is a rear view of the receiving beam 50 (viewed in the negative Y-axis direction). FIG. 12A is a left side view of the receiving beam 50 (viewed in the positive direction of the X axis). FIG. 12B is a right side view of the receiving beam 50 (viewed in the negative direction of the X axis). Note that the Z-axis extends parallel to the vertical direction (upward is the positive direction). The X-axis extends perpendicularly to the Z-axis, and in this embodiment is the longitudinal direction of the receiving beam 50. The Y-axis extends perpendicularly to the Z-axis and the X-axis, and in this embodiment is the width direction of the receiving beam 50.

  As shown in FIGS. 9 to 12, the receiving girder 50 is made of an H-shaped steel having an upper flange portion 51, a lower flange portion 52, and a web portion 53. The upper flange portion 51 and the lower flange portion 52 are plate-like members that face the Z-axis direction so as to be parallel to each other and extend parallel to the longitudinal direction (X-axis direction). When viewed from the Z-axis direction, the upper flange portion 51 and the lower flange portion 52 have the same shape. The web portion 53 extends in parallel with the vertical direction (Z-axis direction) at the center position in the width direction (Y-axis direction) of the upper flange portion 51 and the lower flange portion 52, so that the upper flange portion 51 and the lower flange portion 52 Are connected. Moreover, the web part 53 is extended in parallel with the longitudinal direction (X-axis direction) in the center position in the width direction of each flange part 51,52. Both end portions 53a, 53a in the longitudinal direction of the web portion 53 extend to both end portions 51a, 51a (52a, 52a) in the longitudinal direction of the upper flange portion 51 (lower flange portion 52). Both end portions 51a, 51a (52a, 52a) in the longitudinal direction of the upper flange portion 51 (lower flange portion 52) extend in parallel to the width direction. End portions 51 a, 52 a, 53 a of the respective portions 51, 52, 53 correspond to the end portions 50 a in the longitudinal direction of the receiving beam 50.

  A wide portion 54 is formed in a central region in the longitudinal direction of the receiving beam 50, and narrow portions 56 and 56 are formed on both ends 50 a and 50 a of the receiving beam 50. The narrow portion 56 is smaller in size in the width direction than the wide portion 54. That is, when the width direction size of the wide portion 54 is W1 and the width direction size of the narrow portion 56 is W2, the relationship of W1> W2 is established. Further, the narrow portions 56 and 56 and the wide portion 54 are connected between the narrow portions 56 and 56 and the wide portion 54 so as to spread from the narrow portions 56 and 56 toward the wide portion 54. Inclined taper portions 57 and 57 are formed. The size of the narrow portions 56 and 56 and the tapered portions 57 and 57 in the longitudinal direction will be described later together with the positional relationship with the spar 30.

  In the present embodiment, in the wide portion 54, both end portions 51b, 51b (52b, 52b) in the width direction of the upper flange portion 51 (lower flange portion 52) extend parallel to the longitudinal direction with a separation distance W1 therebetween. ing. In the narrow portions 56, 56, both end portions 51c, 51c (52c, 52c) in the width direction of the upper flange portion 51 (lower flange portion 52) extend in parallel to the longitudinal direction with a separation distance W2. ing. Both end portions 51c, 51c (52c, 52c) in the narrow portions 56, 56 are arranged on the inner side in the width direction than both end portions 51b, 51b (52b, 52b) in the wide portion 54. In the taper portions 57, 57, both end portions 51d, 51d (52d, 52d) in the width direction of the upper flange portion 51 (lower flange portion 52) are wide portions from both end portions 51c, 51c in the narrow portions 56, 56. 54 extends toward both end portions 51b and 51b so as to spread in a letter C shape. Note that the end portions 51 b, 51 c, 51 d of the upper flange portion 51 and the end portions 52 b, 52 c, 52 d of the lower flange portion 52 correspond to the end portions 50 b in the width direction of the receiving girder 50. Further, the upper surface 51 e of the upper flange portion 51 corresponds to the upper surface 50 c of the receiving girder 50 for fixing the leg portion of the front tower 4. Further, the lower surface 52e of the lower flange portion 52 corresponds to the lower surface 50d that is placed on and fixed to the spar 30.

  The narrow portions 56, 56 extend in the vertical direction and connect the upper flange portion 51 and the lower flange portion 52, and plate-like reinforcing ribs 61, 61 extending in parallel from the web portion 53 toward both sides in the width direction. Is provided. The reinforcing ribs 61 and 61 intersect the web portion 53 perpendicularly. The reinforcing ribs 61 and 61 are formed at positions spaced inward in the longitudinal direction from the longitudinal end portion 50a of the receiving girder 50. In the lower flange portion 52, insertion holes 62 and 62 for inserting a shear key (see FIG. 7) are formed at positions where the web portion 53 and the reinforcing ribs 61 and 61 intersect. From the insertion holes 62, 62, the web portion 53 and part of the reinforcing ribs 61, 61 are exposed. Note that it is desirable that the shear key and its insertion hole 62 be provided at the position of the spar in the vicinity of the tower fixing bolt. The reason is that if there is a shear key, it is difficult to slide the girder 50 on the spar 30 and it is necessary to lower the girder 50 from above after aligning the girder 50 when fitting the shear key. Because there is. A plurality of (four in this embodiment) through-holes 63 are formed around the insertion hole 62 for inserting bolts for fixing the receiving girder 50 to the spar 30. The through holes 63 are respectively formed in four regions defined by the web portion 53 and the reinforcing rib 61.

  The receiving girder 50 is not limited to the above-described structure, and the length, width, and the like of each part can be changed as appropriate. Further, the set of the reinforcing rib 61, the insertion hole 62, and the through hole 63 is provided only in the narrow portion 56, but may be provided in the middle of the wide portion 54. Further, the through hole 63 may be a long hole extending in the longitudinal direction (X-axis direction) of the receiving beam 50 so that the fixing position in the longitudinal direction of the receiving beam 50 with respect to the spar 30 may be changed. Moreover, although the narrow part 56 is formed on both ends of the receiving beam 50, it may be formed only on one end. If the holes are not long holes, the horizontal displacement at the time of the earthquake can be kept small, but the long hole structure can be applied to a place other than the tower fixing part that is not a high strength part. Can be absorbed.

  Next, the configuration of the spar 30 will be described with reference to FIGS. 13 and 14. The spar 30 shown in FIGS. 13 and 14 is a representative one of the plurality of spar 30 included in the temporary structure 100, and has a different shape depending on the location in the temporary structure 100. A size girder 30 is used. In the following description, XYZ coordinates are set for the spar 30 for explanation. FIG. 13A is a plan view of the spar 30 (viewed in the negative Z-axis direction). FIG. 13B is a front view of the spar 30 (viewed in the positive direction of the Y axis). FIG. 13C is a bottom view of the spar 30 (a view seen in the positive direction of the Z axis). FIG. 14 is a right side view of the spar 30 (viewed in the negative direction of the X axis). Note that the Z-axis extends parallel to the vertical direction (upward is the positive direction). The X-axis extends perpendicularly to the Z-axis, and in this embodiment is the longitudinal direction of the spar 30. The Y-axis extends perpendicularly to the Z-axis and the X-axis, and is the width direction of the spar 30 in this embodiment.

  As shown in FIGS. 13 and 14, the girder 30 is made of H-shaped steel having an upper flange portion 31, a lower flange portion 32, and a web portion 33. The upper flange portion 31 and the lower flange portion 32 are plate-like members that face in the Z-axis direction so as to be parallel to each other and extend in parallel to the longitudinal direction (X-axis direction). The size in the width direction (Y-axis direction) on the lower surface 30d side of the spar 30 is larger than the size in the width direction on the upper surface 30c side of the sill 30. That is, the size of the lower flange portion 32 in the width direction is larger than the size of the upper flange portion 31 in the width direction. Since the center positions in the width direction of the flange portions 31 and 32 are the same when viewed from above, the both end portions 32b and 32b of the lower flange portion 32 are located outward from the both end portions 31b and 31b of the upper flange portion 31 in the width direction. Protruding to Both end portions 31b, 31b in the width direction of the upper flange portion 31 extend parallel to the longitudinal direction. Both end portions 32b, 32b in the width direction of the lower flange portion 32 extend parallel to the longitudinal direction. In addition, the magnitude | size in the longitudinal direction of each flange part 31 and 32 is the same. Both end portions 31a, 31a in the longitudinal direction of the upper flange portion 31 extend parallel to the width direction. Both end portions 32a, 32a in the longitudinal direction of the lower flange portion 32 extend parallel to the width direction.

  The web portion 33 extends in parallel to the vertical direction (Z-axis direction) at the center position in the width direction (Y-axis direction) of the upper flange portion 31 and the lower flange portion 32, thereby allowing the upper flange portion 31 and the lower flange portion 32 to Are connected. Moreover, the web part 33 is extended in parallel with the longitudinal direction in the center position in the width direction of each flange part 31 and 32. As shown in FIG. Both end portions 33a, 33a in the longitudinal direction of the web portion 33 extend to both end portions 31a, 31a (32a, 32a) in the longitudinal direction of the upper flange portion 31 (lower flange portion 32). End portions 31 a, 32 a, and 33 a of the respective portions 31, 32, and 33 correspond to end portions 30 a in the longitudinal direction of the roof beam 30. The end portions 31 b and 32 b of the flange portions 31 and 32 correspond to the end portions 30 b in the width direction of the spar 30.

  The spar 30 is provided with plate-like reinforcing ribs 34 that extend in the vertical direction, connect the upper flange portion 31 and the lower flange portion 32, and extend in parallel from the web portion 33 toward both sides in the width direction. . The reinforcing ribs 34 intersect with the web portion 33, and a plurality of reinforcing ribs 34 are provided with a certain interval in the longitudinal direction. The reinforcing ribs 34 are formed so as to spread in a C shape in the width direction from the upper flange portion 31 toward the lower flange portion 32 when viewed from the longitudinal direction. Therefore, the roof girder 30 as viewed from the longitudinal direction has a trapezoidal shape as a whole. The reinforcing rib 34 closest to the end 30a in the longitudinal direction is formed at a position spaced further inward in the longitudinal direction than the end 30a. In the upper flange portion 31, insertion holes 36 for inserting a shear key (see FIG. 7) are formed at positions where the web portion 33 and the reinforcing rib 34 intersect each other. A part of the web portion 33 and the reinforcing rib 34 are exposed from the insertion hole 36. In addition, a plurality of (four in this embodiment) through-holes 37 are formed around the insertion hole 36 for inserting bolts for fixing the receiving girder 50 and the spar 30. The through holes 37 are respectively formed in four regions partitioned by the web portion 33 and the reinforcing rib 34. In addition, when the lower surface 50d of the narrow portion 56 of the receiving beam 50 is placed on the upper surface 30c of the floor beam 30, the insertion hole 36 and the through hole 37 of the floor beam 30 are inserted into the insertion hole 62 and the through hole 63 of the space beam 50. It is formed in a position and size so as to communicate with each other. The lower flange portion 32 is formed with a plurality of locations (four locations in the present embodiment) at a predetermined interval in the longitudinal direction with a pair of through holes 38 sandwiching the web portion 33. The through-hole 38 is for inserting a large cross beam bolt 71 (see FIG. 7) for fixing the cross girder 30 to the cross beam 101 of the pier 2, and for fixing the cross girder 30 and the receiving girder 50. The diameter is larger than the through holes 37 and 63 for the receiving girder girder bolt 72. It is possible to reduce the number by increasing the diameter. This bolt position should not be too close to the partition wall (diaphragm) 102 in the cross beam 101 and its weld bead. This is because not only the bolt washer interferes but also the fastening or rotation restraint tool cannot be inserted. Moreover, it is not preferable that the bolt position is too far and the bolt diameter is too large. That is, when an upward tensile force is generated on the bolt. If the bolt diameter is increased and the number of bolts per one of the girders 30 is reduced too much, the bolt tensile force per one will increase, and the top of the cross beam 101 will be increased. This is because the bending stress of the flange exceeds the yield strength and bending deformation (turning up) occurs. As described above, it is necessary to design the arrangement, thickness, strength, etc. of these members in a balanced manner.

  Note that the girder 30 is not limited to the above-described structure, and the length relationship, width, and the like of each part can be changed as appropriate. Further, the through hole 37 may be a long hole extending in the width direction (Y-axis direction) of the spar 30 so that the fixed position in the longitudinal direction of the receiving girder 50 with respect to the spar 30 may be changed. Moreover, you may make the magnitude | size of the width direction the same at the upper surface side and lower surface side of the spar 30. If the holes are not long holes, the horizontal displacement at the time of the earthquake can be kept small, but the long hole structure should be carried out at a place other than the tower fixing part that is not a high strength part, and the error in the bolt hole position between the tower legs will be reduced. Can be absorbed.

  Next, the positional relationship between the cross beam 101 of the bridge pier 2, the girder 30, the receiving girder 50, and the leg 21 of the front tower 4 will be described with reference to FIGS. 7 and 8. 7 and 8, for ease of understanding, only the girder 30 and the receiving girder 50 around the fixed position of one leg 21 are shown, and the other girder 30 and the receiving girder 50 are omitted. ing. Further, FIG. 7 and FIG. 8 show three spar 30 and a spar 30A, a spar 30B, and a spar 30C are sequentially arranged in the horizontal direction D2. A plurality of receiving girder 50 spanned between the spar 30A and the spar 30B is defined as a receiving girder 50A, and a plurality of the receiving girder 50 spanned between the spar 30B and the spar 30C is received. The digit 50B is assumed. One receiving digit 50A corresponds to the “first receiving digit” in the claims, and the other receiving digit 50B corresponds to the “second receiving digit” in the claims. In this case, the narrow portion 56 and the wide portion 54 of the receiving beam 50A correspond to the “first narrow portion” and the “first wide portion” in the claims, and the narrow portion 56 and the wide portion of the receiving beam 50B. 54 corresponds to the “second narrow portion” and the “second wide portion” in the claims. However, one receiving digit 50A may correspond to the “second receiving digit” in the claims, and the other receiving digit 50B may correspond to the “first receiving digit” in the claims.

  The girders 30A, 30B, and 30C are fixed to the cross beam 101 by placing the bottom surface 30d of the lower flange portion 32 on the top surface of the cross beam 101 and fastening with the cross beam bolt 71. The span girders 30A, 30B, and 30C are arranged and fixed so as to extend in the front-rear direction D1 at a position corresponding to the partition wall portion (diaphragm) 102 in the cross beam 101 of the pier 2.

  The receiving girder 50A extends in the horizontal direction D2 on one side (here, the left side of the paper) in the width direction of the girder 30B, and one end 50a side (corresponding to “one end side” in the claims) is the girder 30B. The other end 50a side is fixed on the roof girder 30A. The receiving girder 50B extends in the lateral direction D2 on the other side (here, the right side of the paper) in the width direction of the girder 30B, and one end 50a side (corresponding to “one end side” in the claims) is the girder 30B. The other end 50a side is fixed on the spar 30C. The support girders 50A, 50B are placed on the upper surface 30c of the upper flange portion 31 of the girder 30A, 30B, 30C, and the lower girder 50A, 50B is fastened with a girder girder bolt 72 by fastening the lower girder 30A. , 30B, 30C. Further, in this state, the insertion hole 62 of the receiving beam 50A and the insertion holes 36 of the floor beams 30A and 30B are in a positional relationship such that they communicate with each other. In addition, the insertion hole 62 of the receiving beam 50B and the insertion hole 36 of the roof beams 30B and 30C are in a positional relationship such that they communicate with each other. Therefore, the shear key 86 (see FIG. 7) is inserted into the (cylindrical) space formed by the insertion hole 36 and the insertion hole 62. As a result, a shear key 86 is provided at each joint between the spar 30A, 30B, 30C and the receiving girders 50A, 50B. In FIG. 7, only the shear key 86 inserted between the receiving beam 50B and the spar 30C is shown, but it is also inserted in other parts. The shear key 86 has a diameter substantially the same as the inner diameter of the insertion holes 36 and 62 (a slightly smaller one is easier to insert and fit), and a height in the vertical direction is at least lower than the depth of the insertion hole 36. It is a columnar member (the height is slightly lower than the height after the receiving girder 50 and the spar 30 are fitted together to absorb manufacturing errors and the like).

  As shown in FIG. 8, a plurality of receiving beams 50A and receiving beams 50B are arranged in a staggered manner along the front-rear direction D1. The plurality of receiving beams 50A are arranged in the front-rear direction D1 so as to be separated from each other at a constant interval. On the other hand, the plurality of receiving girders 50B are arranged in the front-rear direction D1 so as to be separated from each other at regular intervals so that one receiving girder 50B is arranged between the receiving girders 50A and 50A adjacent to each other. On the girder 30B to which the receiving girder 50A and the receiving girder 50B are fixed, the portions on the end 50a side of the receiving girder 50A, 50B are arranged alternately. On the spar 30B, the receiving girder 50A and the receiving girder 50B are arranged so as to contact each other. However, it is good to arrange | position so that a clearance gap may be provided slightly.

  Here, a narrow portion 56 is formed on the end portion 50a side of the receiving girders 50A and 50B. In the receiving girders 50A and 50B, a portion of the narrow portion 56 is placed on the floor girder 30 and fixed. The size of the narrow portion 56 is not particularly limited, but it is necessary to satisfy the bolt diameter to be used and the enlarged hole diameter satisfying the specified margin, and more than the specified edge distance from the outer edge of the bolt hole. It is preferable that a portion where one receiving beam 50A and the adjacent receiving beam 50B come into contact (or may be slightly separated) on 30B is at least a narrow portion 56. That is, it is preferable that the region where the receiving beam 50A and the receiving beam 50B overlap is at least the narrow portion 56 when viewed from the front-rear direction D1. In the present embodiment, the base end portion 56a (the boundary position between the narrow portion 56 and the tapered portion 57) of the narrow portion 56 of the receiving beam 50A is longer than the longitudinal end portion 50a of the narrow portion 56 of the receiving beam 50B. Is also arranged outside in the width direction of the spar 30. Therefore, the end 50a of the receiving beam 50B is prevented from interfering with the tapered portion 57 and the wide portion 54 of the receiving beam 50A. The base end portion 56a of the narrow portion 56 of the receiving girder 50B is disposed on the outer side in the width direction of the spar 30 than the end portion 50a in the longitudinal direction of the narrow portion 56 of the receiving girder 50A. Therefore, the end 50a of the receiving beam 50A is prevented from interfering with the tapered portion 57 and the wide portion 54 of the receiving beam 50B. Furthermore, a space where a hand can be put when the bolts for fixing the receiving girders 50A and 50B to the spar 30 are fastened can be formed at the position of the tapered portion 57.

  On the other hand, a wide portion 54 of the receiving beam 50A is formed in substantially the entire region in the lateral direction D2 between the beam beam 30A and the beam beam 30B. Further, a wide portion 54 of the receiving beam 50B is formed in substantially the entire area in the lateral direction D2 between the floor beam 30C and the wall beam 30B. As a result, on the spar 30A, 30B, 30C, each spar 30A, 30B, 30C is larger than the size G1 of the gap between one receiving spar 50A, 50B and the adjacent receiving spar 50A, 50B. The size G2 of the gap in the area between them can be reduced. That is, the area of the upper surface 50c of the receiving girders 50A and 50B in the region can be increased as much as possible, and the place where the leg portion 21 of the front tower 4 can be fixed can be increased.

  As shown in FIGS. 7 and 8, the pedestal portion 23 at the lower end of the leg portion 21 of the front tower 4 corresponds to the wide portion 54 of the receiving girders 50A and 50B in which the area of the upper surface 50c is widened. Thus, the receiving digits 50A and 50B are fixed. The pedestal portion 23 of the leg portion 21 is fixed via a tower leg portion bolt 83 on a mounting iron plate 81 fixed to the upper surface 50c of the receiving girders 50A and 50B. The mounting iron plate 81 has a plurality of through holes at both edges in the lateral direction D2 (see FIG. 8). When fixing the receiving girders 50A and 50B and the mounting iron plate 81, the upper flange portion of the receiving girders 50A and 50B is further placed at a position where any of the plurality of through holes of the mounting iron plate 81 does not interfere with the web of the receiving girders 50A and 50B. The mounting iron plate bolt 82 is inserted and fixed at a position where the edge distance of the hole formed in 51 is secured. The through-holes on the upper flange portion 51 side of the receiving girders 50A and 50B may be provided in a plurality of rows in the front-rear direction D1 and in the lateral direction D2 so as to be selectable in advance. In consideration of construction errors rather than making a hole, a hole drilling machine may be used to make a through hole of the mounting iron plate 81 as a guide at a required timing. Since a wide width for the mounting iron plate bolt 82 is secured by the wide portion 54, it is possible to perform secure fixing. One end side of the mounting iron plate 81 and the pedestal portion 23 in the lateral direction D2 is fixed on the receiving beam 50A side, and the other end side is fixed on the receiving beam 50B side. That is, the mounting iron plate 81 and the pedestal portion 23 are fixed to the receiving girders 50A and 50B in a state of being supported by the spar 30B. As a result, the leg 21 of the front tower 4 straddles the spar 30B and is fixed on the receiving spar 50A and 50B on both ends in the width direction (lateral direction D2) of the spar 30B. It becomes. When a vertically upward force (lifting force) is generated in the tower, a bending stress is generated in the mounting iron plate 81 as a tensile force is generated in the mounting iron plate bolt 82 of the mounting iron plate 81. Therefore, in this case, the tensile force of the mounting iron plate bolt 82 is reduced by making the mounting iron plate 81 high strength or thick or by making the through hole for the bolt of the mounting iron plate 81 close to the fixing part of the tower lower arm. .

  As shown in FIG. 8, in the area near the spar 30B, a space 75 is formed by ensuring a wide gap between one receiving beam 50A, 50B and the adjacent receiving beam 50A, 50B ( (See the area indicated by E in FIG. 8). In the present embodiment, the base end portion 56a of the narrow portion 56 of the receiving beam 50A is outside the end portion 50a in the longitudinal direction of the receiving beam 50B and the end portion 31b in the width direction of the upper flange portion 31 of the floor beam 30B. Is arranged. Accordingly, the space 75 is formed in a portion surrounded by the width direction end 50b, the taper 57, and the end 30b of the upper flange 31 (or the end 50a of the receiving beam 50A) in the narrow portion 56. Is done. Further, the base end portion 56a of the narrow portion 56 of the receiving girder 50B is arranged outside the end portion 50a in the longitudinal direction of the receiving girder 50A and the end portion 31b in the width direction of the upper flange portion 31 of the spar 30B. ing. Therefore, the space 75 is formed in a portion surrounded by the width direction end 50b, the taper 57, and the end 30b of the upper flange 31 (or the end 50a of the receiving beam 50B) in the narrow portion 56. Is done. In addition, when G2 is sufficiently wide, or when the bolt fastening is not necessary by fitting the receiving girder 50 and the spar 30 and making an uneven structure or the like, the base end portion 56a of the narrow portion 56 is The space portion 75 may not be formed by being arranged on the inner side of the end portion 30 b of the upper flange portion 31.

  With the above configuration, the pushing force from the front tower 4 is transmitted in the order of the leg 21, the mounting iron plate 81, the receiving girder 50, the siding 30, and the partition wall 102 of the cross beam 101 of the pier 2. A bending and shearing force is generated in the receiving girder 50 at a span with the spar 30 as a fulcrum. Further, the tensile force is transmitted through the bolts in the order of the leg 21, the mounting iron plate 81, the receiving girder 50, the roof girder 30, the upper flange of the cross beam 101 of the pier 2, and the partition wall 102. Bending and shearing force are generated in the upper flange of the cross beam 101.

  Next, operations and effects of the temporary structure 100, the fixing method, the receiving girder 50, and the spar 30 according to the present embodiment will be described.

  The temporary structure 100 according to the present embodiment extends in the lateral direction D2 on one side in the width direction of the spar 30B, and has a receiving girder 50A whose one end is fixed on the spar 30B and in the width direction of the spar 30B. On the other hand, it is provided with a receiving girder 50B that extends in the lateral direction D2 and that has one end fixed to the top girder 30B. The plurality of receiving beams 50A and 50B are alternately arranged along the front-rear direction D1 in which the floor beam 30B extends. With such an arrangement, the receiving surfaces for receiving the front tower 4 are configured by arranging the receiving beams 50A and 50B at predetermined intervals on both sides in the width direction of the floor beam 30B. Further, by supporting the receiving girders 50A, 50B with the siding girders 30A, 30B, 30C at positions separated from the upper surface of the cross beam 101, obstacles such as attachment plates on the cross beam 101 can be avoided. Here, a narrow portion 56 having a narrower width than the wide portion 54 extending in the lateral direction D2 is formed on one end portion side fixed on the spar 30B of the receiving beam 50A. Further, a narrow portion 56 having a narrower width than the wide portion 54 extending along the horizontal direction D2 is formed on one end portion side fixed on the spar of the receiving beam 50B. As a result, the narrow portions 56 of the receiving girders 50A and 50B are arranged adjacent to each other on the spar 30B, while the wide portions 54 respectively receive the narrow portions 56 in the width direction of the spar 30B. By widening the widths of the girders 50A and 50B, it is possible to ensure a sufficiently large receiving surface with respect to the leg portion 21 of the front tower 4. Thereby, when temporarily fixing the front tower 4 to the bridge pier 2, it can fix reliably. Since the receiving surface is wide, a sufficient space for fastening the bolt 82 having a large diameter for fixing can be secured.

  This secures a larger area of the upper flange portion 51 on one side excluding the web portion 53 of the receiving girders 50A and 50B, thereby providing a space for drilling a bolt hole in consideration of a construction error when fixing the bolt. In addition, it means that an edge distance satisfying a required strength from the bolt hole to the outer edge of the upper flange portion 51 can be obtained. Here, as shown in FIG. 16 (a), when fixing the receiving girders 150A, 150B on the spar 30, when the butt is fixed, the end of the one receiving spar 150A, 150B and the spar 30 are connected. While the number of the bolts 72 to be fixed is two, as shown in FIG. 16B, when the receiving girders 250A and 250B are alternately arranged and fixed to the floor girders 30, four bolts 72 are provided. It is possible to fix with a large number of bolts, and high earthquake resistance can be imparted by fixing with a larger number of bolts. Further, since the receiving girders 150A and 150B in FIG. 16B extend with a certain width, the gap G between the receiving girders becomes large, and the useless space increases, so that the bolt holes for the bolts 82 are opened. The surface becomes narrower. For example, the bolt 82 cannot be fixed at the position between the receiving girders 250B and 250B (for example, the bolt 82 cannot be fixed at the position indicated by PG in the figure), and such a region where the bolt 82 cannot be fixed is wide. Become. On the other hand, in the structure of FIG. 16C according to the present embodiment, the gap G between the receiving girders becomes narrower than the structure of FIG. The receiving surface for emptying becomes wider. As described above, the width of the cross girder fixing portions of the receiving girders 50A and 50B is made narrow and the others are made wide to compensate for the disadvantage that the butt fixing is not made (the receiving surface for opening the bolt hole is narrow). Moreover, the minimum space (space part 75) for putting the hand at the time of bolt-fastening the receiving girders 50A and 50B to the spar 30 can be secured.

  Further, in the temporary structure 100 according to the present embodiment, the narrow portion 56 extends to the outside of the end portion 30b (here, the end portion 31b of the upper flange portion 31) in the width direction of the spar 30B. Thus, a space 75 is formed between the end 30b in the width direction of the spar 30B and the wide portion 54. The operator can easily perform operations such as bolting using the space 75.

  Further, the provision of the wide portion 56 improves the earthquake resistance. This is because the receiving girder 50 has a strong shaft arrangement (the direction in which the upper and lower flanges face each other) with respect to its own weight in the vertical direction, and the receiving girder for the horizontal force in the bridge axis direction (D1 direction) has a weak axis arrangement. Because. For tower leg bolts, especially when “girder temporary device movement” or “direction change of girder laying machine (horizontal rotation)” is limited (time when the adjacent train is stopped during railway construction, Since it is advantageous to fix with a small number of bolts during road construction (such as when the passing vehicle is stopped), the horizontal force during an earthquake tends to concentrate on a single girder with a fixed tower leg. Therefore, such a structure having even a high earthquake resistance is effective.

  Further, in the temporary structure 100 according to the present embodiment, the receiving girders 50A and 50B connect the narrow portion 56 and the wide portion 54 and are tapered so as to spread from the narrow portion 56 toward the wide portion 54. A portion 57 is provided. This secures a space for putting a hand when bolting the receiving girder 50 to the spar 30. Where the upper and lower flange portions extend from the narrow portion 56 to the wide portion 54, they may be planarly formed in a step shape (key shape) (a little space is needed for tightening bolts). Stress can be transmitted smoothly by using a tapered shape instead of a shape.

  Moreover, in the temporary structure 100 according to the present embodiment, the size in the width direction on the lower surface side of the spar 30B is larger than the size in the width direction on the upper surface side of the spar 30B. On the upper surface side of the spar 30B, the spar 30B and the receiving girders 50A and 50B are fixed by bolts or the like. On the other hand, on the lower surface side of the spar 30B, the spar 30B and the cross beam 101 are fixed by bolts or the like. Since the size in the width direction on the lower surface side of the spar 30B is larger than that on the upper surface side, the fixing between the spar 30B and the cross beam 101 is ensured (for example, by increasing the number of bolts to reduce the number). It can be carried out. The fact that the number of bolts can be reduced is effective in the case where uneven portions (attachment plates and bolts for constructing (assembling) the structure to be fixed) interfere with the spar. On the other hand, the size of the narrow portion 56 of each of the receiving girders 50A and 50B can be reduced by reducing the upper surface side of the spar 30B, and thereby the wide portion 54 serving as the receiving surface of the leg portion 21 can be reduced. Can be bigger.

  Further, in the temporary structure 100 according to the present embodiment, a shear key 86 is provided at a joint portion between the roof beam 30B and the receiving beams 50A and 50B. Thus, the load acting in the shearing direction can be reliably supported between the spar 30B and the receiving girders 50A, 50B in a form that supplements the bolt strength. This not only improves seismic resistance, but also reduces the number of bolts, makes the bolt diameter thinner, and makes the bolt strength cheaper and lower than the required strength. Become.

  Further, in the fixing method according to the present embodiment, the leg portion 21 straddles the spar 30B and is fixed on the receiving girder 50A and the receiving girder 50B at both ends in the width direction of the spar 30B. Thereby, the leg part 21 of the front tower 4 can be supported by the spar 30B, and the front tower 4 can be reliably supported. Although depending on the vertical strength of the receiving girders 50A and 50B, at least two girder 30 below the leg portion 21 of the tower 1 and a rigid partition wall of a fixed structure that supports the girder 30 It is desirable in terms of strength to have (diaphragm).

  Further, in the receiving girders 50A and 50B of the temporary structure 100 according to the present embodiment, the end portion fixed to the spar 30 on the cross beam 101 is narrower than the wide portion 54 extending in the lateral direction D2. A narrow portion 56 having the shape is formed. By applying such a receiving girder 50 to the temporary structure 100 as described above, it is possible to secure a sufficiently large receiving surface with respect to the front tower 4. Thereby, when temporarily fixing the front tower 4 to the cross beam 101, it can fix reliably.

  Moreover, in the spar 30B of the temporary structure 100 according to the present embodiment, the size in the width direction on the lower surface side arranged on the cross beam 101 is the width on the upper surface side where the end portions of the receiving girders 50A and 50B are arranged. Larger than the size of the direction. By applying such a girder 30B to the temporary structure 100 as described above, the size in the width direction on the lower surface side of the girder 30B is larger than that on the upper surface side. Can be reliably fixed (for example, by thickening the bolt). On the other hand, by reducing the upper surface side of the girder 30B, the size of the narrow portion 56 of each of the receiving girders 50A and 50B can be reduced, and thereby the wide portion 54 serving as the receiving surface of the front tower 4 can be reduced. Can be increased.

  The present invention is not limited to the embodiment described above.

  For example, in the above-described embodiment, the direction in which the girder 30 extends (the “first direction” in the claims) is parallel to the front-rear direction D1 of the girder installation device 1, but is inclined with respect to the front-rear direction D1. You may do it. Moreover, although the direction (the "second direction" in the claims) in which the girder 50 extends is parallel to the lateral direction D2 of the girder installation device 1, it may be inclined with respect to the lateral direction D2. For example, as shown in FIG. 15A, the roof girder 30 may extend in a direction D3 inclined with respect to the front-rear direction D1. In this case, the receiving girder 50 and the spar 30 are not orthogonal.

  Moreover, the cross beam 101 of the bridge pier 2 may be comprised combining several members (refer FIG. 6). Therefore, as shown in FIGS. 15B and 15C, a connecting member 92 that connects the members may be arranged on the cross beam 101. That is, an uneven part may be formed on the cross beam 101. On the other hand, a notch 91 is formed on the lower surface side of the girder 30 so as to avoid the uneven portion (here, the connecting member 92) formed on the cross beam 101. Thereby, the girder 30 can be fixed even in a place where the uneven portion is provided. Therefore, it is possible to suppress the restriction of the convex and concave portions on the cross beam 101 and to arrange the spar 30 at a position where the leg portion 21 can be surely temporarily fixed.

  Further, the reinforcing rib 34 and the web portion 33 do not have to be vertical. For example, the reinforcing rib 34 of the spar 30 shown in FIG. 17 is provided so as to be inclined with respect to the web portion 33. 17 has a notch 91 provided in a part of the lower flange portion 32, so that the convex and concave portions on the cross beam 101 can be avoided.

  The receiving girder 50 only needs to have the narrow portion 56 formed on the end side in the longitudinal direction and the wide portion 54 formed in the other portion (position between the spar 30). Whether the wide part 54 is expanding is not particularly limited. For example, the wide portion 54 may be wide only on one side in the width direction. Specifically, on one side in the width direction, end portions 51b and 52b (end portions corresponding to the wide portion 54) of the flange portions 51 and 52 are end portions 51c and 52c (the narrow portion 56). The end portions 51b and 52b and the end portions 51c and 52c may extend linearly on the other side in the width direction (in this case, the tapered portion 57 is Not provided).

  Moreover, in the above-described embodiment, the front tower and the rear tower are illustrated as the structure, and the bridge pier (lateral beam) is illustrated as the fixed structure, but the structure and the fixed structure are not limited thereto. For example, when temporarily fixing a tower crane or a building window cleaning gondola crane (hanging device) to a bridge pier or a building roof as a fixed structure, the temporary structure may be used. .

  In addition, the temporary structure for temporarily fixing the structure may be left or used as part of a permanent (permanent) structure when the upper part is used for a sidewalk, road, railway, waterway, etc. Good. However, for that purpose, it is necessary to carry out rust prevention treatment such as painting and plating for having the required durability for more than the temporary years.

DESCRIPTION OF SYMBOLS 1 ... Girder construction apparatus, 2 ... Bridge pier, 3 ... Girder material, 4 ... Front tower, 6 ... Rear tower, 7 ... Suspension girder, 8 ... Girder, 9 ... Travel girder, 30 ... Laying girder, 50 ... Receiving Girder, 54 ... wide part, 56 ... narrow part, 57 ... taper part, 86 ... shear key, 91 ... notch part, 100 ... temporary structure.

Claims (9)

In order to temporarily fix the structure to the fixed structure, the temporary structure provided on the fixed structure,
A girder provided on the fixed structure and extending in a first direction;
A first receiving beam that extends in a second direction intersecting with the first direction on one side in the width direction of the roof beam and one end side of which is fixed on the roof beam;
A second receiving girder that extends in the second direction on the other side in the width direction of the spar and that has one end fixed to the spar.
A plurality of the first receiving digits and the second receiving digits are arranged alternately along the first direction,
A first narrow portion having a narrower width than the first wide portion extending in the second direction is formed on the one end portion side of the first receiving beam.
A temporary structure in which a second narrow portion having a narrower width than the second wide portion extending along the second direction is formed on the one end portion side of the second receiving beam. .   2. The temporary structure according to claim 1, wherein at least one of the first narrow portion and the second narrow portion extends to an outside of an end portion of the spar in the width direction. First that the first受桁connects the first wide portion and the first narrow portion, inclined from the first narrow portion so as to extend toward the first wide portion Or have a taper portion of
The second receiving beam is connected to the second narrow part and the second wide part, and is inclined so as to spread from the second narrow part toward the second wide part. Having a taper portion of
The temporary structure according to claim 1 or 2, wherein the first receiving beam has the first tapered portion, and the second receiving beam has the second tapered portion .   The temporary structure according to any one of claims 1 to 3, wherein a size in the width direction on the lower surface side of the cross girder is larger than a size in the width direction on the upper surface side of the cross girder. .   The temporary structure according to any one of claims 1 to 4, wherein a notch portion is formed on a lower surface side of the roof girder so as to avoid an uneven portion formed on the fixed structure. . The shear key is provided in at least one of the junction part of the said cross girder and the 1st receiving girder, and the junction part of the said cross girder and the said 2nd girder. A temporary structure according to any one of the above. A fixing method for fixing a structure to the temporary structure according to any one of claims 1 to 6,
The structure has legs,
The leg portion straddles the siding girder,
The fixing method of fixing on the said 1st receiving beam and the said 2nd receiving beam in the both ends in the said width direction of the said beam. In order to temporarily fix the structure to the fixed structure, a receiving girder of the temporary structure provided on the fixed structure,
A girder for a temporary structure, in which a narrow portion having a narrower width than a wide portion extending in the second direction is formed on an end portion side fixed to a floor girder on the fixed structure. In order to temporarily fix the structure to the fixed structure, it is a temporary girder of a temporary structure provided on the fixed structure,
The temporary structure structure girder is larger in size in the width direction on the lower surface side arranged on the fixed structure than in the width direction on the upper surface side where the end side of the receiving girder is arranged. .

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