JP2015190122A - Beam-like member construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of beam-like members.SOLUTION: The beam-like member construction method includes: a lifting step of lifting a pair of erection units 22A and 22B formed by dividing a beam-like member 20 along a material axis direction, with the use of lifting equipment 16 to install the units on a temporary support 14; and a connection step of connecting adjoining erection units 22A, 22B on the temporary support 14 to form the beam-like member 20.

Description

  The present invention relates to a beam-shaped member construction method.

  A construction method for a precast foundation beam is known (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2-70850

  By the way, a vent method is known as a construction method for beams, bridges, arches and the like. In this vent method, for example, a plurality of vents (temporary struts) are temporarily installed at predetermined intervals. Next, a plurality of beam-like members obtained by cutting the beam in a direction orthogonal to the material axis are respectively lifted by a lifting machine such as a crane and sequentially installed between the vents. Next, after adjacent beam-shaped members are joined to construct one beam, each vent is removed.

  Here, the number of beams divided (the number of beam-like members) is set according to the lifting capacity (lifting weight limit) of the lifting machine. Therefore, when the cross-sectional area of the beam increases and its weight increases, the number of beam-shaped members increases. In this case, since the number of vents supporting the beam-like member also increases, there is a possibility that it takes time to perform temporary work of the vents.

  The present invention is intended to improve the workability of the beam-shaped member in consideration of the above facts.

  The beam-shaped member construction method according to claim 1, wherein a lifting step of lifting a plurality of building units obtained by dividing the beam-shaped member along the material axis direction with a lifting machine and placing the unit on the column, and the column A connecting step of connecting adjacent building units and forming the beam-like member.

  According to the beam-shaped member construction method according to claim 1, first, a plurality of building units obtained by dividing the beam-shaped member along the material axis direction are respectively lifted by a lifting machine in the lifting process and placed on a support column. To do. Next, in the connecting step, adjacent building units on the columns are joined to form a beam-like member.

  In this way, by dividing the beam-shaped member into a plurality of construction units along the material axis direction, the weight of each construction unit is reduced, so the length of each construction unit in the material axis direction is increased. Can do. Therefore, compared with the case where a beam-shaped member is not divided | segmented into a some construction unit along a material-axis direction, the space | interval of the support | pillar which supports a construction unit can be expanded. Therefore, since the required number of support | pillars reduces, workability improves.

  The beam-shaped member construction method according to claim 2 joins the reinforcing plates provided on each outer peripheral surface of the adjacent building unit in the connecting step in the beam-shaped member construction method according to claim 1. Alternatively, a reinforcing plate is provided over the outer peripheral surface of the adjacent building unit, and the building unit is joined to the reinforcing plate.

  According to the beam-shaped member construction method according to claim 2, the reinforcing plates provided on the outer peripheral surfaces of the adjacent building units are joined in the connecting step. Alternatively, a reinforcing plate is provided over the outer peripheral surface of the adjacent building unit, and the building unit is joined to the reinforcing plate.

  Thus, by adjoining the building unit through the reinforcing plate, the adjacent building unit can be joined while reinforcing the beam-like member.

  As described above, according to the beam-shaped member construction method according to the present invention, the workability of the beam-shaped member can be improved.

It is an elevation view showing a bridge provided with a plurality of beam-like members concerning a 1st embodiment of the present invention. It is a perspective view which shows the beam-shaped member shown by FIG. It is a disassembled perspective view which shows a part of beam-like member shown by FIG. (A) And (B) is the front view which looked at the beam-shaped member shown by FIG. 1 from the material-axis direction. (A) is an elevation view corresponding to FIG. 1 for explaining a method for constructing a beam-shaped member according to a comparative example, and (B) is a front view corresponding to FIG. 4 (B). (A) is an elevational view showing a bridge provided with a plurality of beam-like members according to the second embodiment of the present invention, and (B) shows the beam-like member shown in FIG. It is the front view seen from. It is the front view which looked at the beam-shaped member which concerns on 3rd Embodiment of this invention from the material-axis direction. (A) And (B) is the front view which looked at the beam-shaped member shown by FIG. 7 from the material-axis direction. (A) And (B) is the front view which looked at the beam-shaped member shown by FIG. 7 from the material-axis direction. It is a perspective view which shows the modification of the beam-shaped member which concerns on 1st Embodiment of this invention.

  Hereinafter, a beam-shaped member construction method according to an embodiment of the present invention will be described with reference to the drawings.

  First, the first embodiment will be described.

  FIG. 1 shows a bridge 10 constructed by the beam-shaped member construction method according to the present embodiment. The bridge 10 is formed by joining a plurality of (three in this embodiment) beam-like members 20 arranged in the material axis direction, and is installed on a pair of main columns 12. In the following, for convenience of explanation, the three beam-like members 20 shown in FIG. 1 may be described separately from the beam-like members 20A, 20B, and 20C in order from the right side.

  As shown in FIG. 2 and FIG. 3, each beam-like member 20 is a steel structure, and is a pair of building methods divided in the left-right direction (arrow Y direction) along the material axis direction (arrow X direction). It has units 22A and 22B and a plurality of connecting members 28 that connect the pair of building units 22A and 22B.

  The pair of building units 22A and 22B are formed so as to be able to stand on their own in a state of being laid between a pair of temporary columns 14 (see FIG. 1) described later, for example. Specifically, each building unit 22A, 22B has a pair of truss beams 24 arranged on the left and right sides and a plurality of connecting members 26 that connect the pair of truss beams 24 as shown in FIG. doing.

  The truss beam 24 includes an upper chord member 24A, a lower chord member 24B, and a plurality of diagonal members 24C and 24D connecting the upper chord member 24A and the lower chord member 24B. The diagonal members 24 </ b> C and 24 </ b> D are inclined in directions opposite to each other, and intersect each other at an intermediate portion (in the present embodiment, a central portion) in the beam forming direction of the truss beam 24. That is, the diagonal members 24C and 24D are joined in an X shape in a side view. For the pair of truss beams 24, for example, various truss structures such as a feeler deal can be adopted.

  The connecting member 26 connects the upper chord members 24A of the pair of truss beams 24, the lower chord members 24B, and the intersecting portions 24E of the diagonal members 24C and 24D in the left-right direction (arrow Y direction). Thereby, each construction unit 22A, 22B becomes independent. In addition, each construction unit 22A, 22B may be assembled at the site, or may be transported to the site after being assembled at the factory.

  The pair of building units 22 </ b> A and 22 </ b> B formed in this way are connected via a plurality of connecting members 28 while being installed on the pair of temporary columns 14. The connecting member 28 connects the upper chord members 24A and the lower chord members 24B of the pair of building units 22A and 22B in the left-right direction (arrow Y direction).

  Next, an example of a construction method for the beam-shaped member 20 will be described.

  FIG. 1 shows a bridge 10 under construction. In FIG. 1, a plurality of (two in this embodiment) temporary struts (vents) 14 are temporarily disposed between a pair of permanent struts 12, and the right-side permanent struts 12 and temporary struts 14 are disposed. The beam-like member 20A is installed only between the two. Below, the beam-shaped member construction method of this embodiment is demonstrated centering on the beam-shaped member 20B of the center among three beam-shaped members 20A, 20B, 20C which comprise the bridge 10. FIG. In addition, the beam-shaped member construction method according to the present embodiment is not limited to the bridge 10 and can be applied to, for example, a beam-shaped member constituting a beam, an arch, or the like of a building.

  First, the lifting process will be described. In the lifting process, first, of the pair of building units 22A and 22B obtained by dividing the beam-like member 20B along the material axis direction, one building unit 22A is lifted by a lifting machine 16 such as a crane, and a pair of temporary installations Place it on the column 14.

  Next, as shown in FIG. 4A, the other building unit 22B out of the pair of building units 22A and 22B is lifted by the lifting machine 16 and placed on the pair of temporary columns 14. At this time, one construction unit 22A and the other construction unit 22B are arranged adjacent to each other in the left-right direction. The pair of building units 22A and 22B are independent on the temporary support column 14, respectively.

  Next, a connection process is demonstrated. As shown in FIG. 4B, in the connecting step, the pair of building units 22A and 22B placed on the temporary support column 14 are connected to form a beam-like member 20B. Specifically, the lower chord members 24B of the pair of building units 22A and 22B are connected to each other via the connecting member 28, and the upper chord members 24A of the pair of building units 22A and 22B are connected to each other via the connecting member 28. To do. Thereby, the beam-like member 20B is formed.

  The connecting member 28 may be joined in advance to any of the pair of building units 22A and 22B. Further, the connecting member 28 and the upper chord member 24A or the lower chord member 24B are joined by, for example, welding or a bolt (not shown). Moreover, the connection position which connects a pair of construction unit 22A, 22B with the connection member 28 can be changed suitably. Further, the connecting member 28 may be omitted, and the pair of building units 22A and 22B may be directly connected by welding, bolts, or the like.

  Through the above procedure, the three beam members 20A, 20B, and 20C are formed, and the three beam members 20A, 20B, and 20C that are formed are joined in the material axis direction to form the bridge 10. Thereafter, the temporary support column 14 is removed.

  In addition, the timing which connects a pair of construction units 22A and 22B can be changed suitably. For example, after joining one construction unit 22A of the three beam members 20A, 20B, and 20C in the material axis direction, the other construction unit 22B may be connected to each construction unit 22A. .

  Next, the operation of the first embodiment will be described.

  First, the bridge 100 according to the comparative example will be described. As shown in FIG. 5A, the bridge 100 according to the comparative example is formed by joining a plurality of beam-like members 110 arranged in the material axis direction. In the following, for convenience of explanation, the three beam-like members 110 shown in FIG. 5A may be described separately from the beam-like members 110A, 110B, and 110C in order from the right side.

  In general, the number of divisions in the material axis direction of the bridge 100 (the number of beam-like members 110) is set according to the lifting capacity (lifting limit) of the lifting machine 16. Therefore, for example, when the cross-sectional area of the bridge 100 is increased and the weight thereof is increased, the number of the beam-shaped members 110 is increased, and the beam-shaped members 110 (for example, the beam-shaped members 110C) per one in the material axis direction. Length M is shortened. Thus, when the length M of the beam-shaped member 110 in the material axis direction is shortened, the interval M between the temporary columns 14 that support the beam-shaped member 110 (for example, the beam-shaped member 110C) is reduced. The number increases. Therefore, it may take time to temporarily install and remove the temporary support column 14.

  On the other hand, in this embodiment, the beam-like member 20 is divided into a pair of building units 22A and 22B in the left-right direction along the material axis direction. As a result, the weight of each of the building units 22A and 22B is substantially half (about 1/2) of the beam-like member 20, so that the material axis direction of the pair of building units 22A and 22B as shown in FIG. The length L can be increased.

  That is, in this embodiment, according to the lifting capacity of the lifting machine 16, each beam-shaped member 20 is appropriately divided into a plurality of building units 22A and 22B along the material axis direction, whereby each building unit 22A. Each of the building units 22A and 22B can be lifted by the lifting machine 16 while securing the length L in the material axis direction of the steel rods 22B.

  Thereby, in this embodiment, the space | interval L of the temporary support | pillar 14 can be expanded rather than the beam-shaped member 110 which concerns on a comparative example. Therefore, since the required number of temporary struts 14 is reduced, it is possible to reduce troubles such as temporary installation and removal work of the temporary struts 14.

  Further, in order to divide the beam-like member 20 into a pair of building units 22A, 22B in the left-right direction, the beam-like member 20 is vertically paired with a pair of building units 32A, 32B (see FIG. 2). 6 (B)), the beam formation T (see FIG. 4 (A)) of each of the building units 22A and 22B becomes higher. Therefore, the bending rigidity etc. of each construction unit 22A, 22B can be improved efficiently.

  Next, a second embodiment will be described. In addition, about the thing of the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 6A and 6B, the beam-like member 30 according to the second embodiment is a pair of building methods divided in the vertical direction (arrow Z direction) along the material axis direction. Units 32A and 32B are provided.

  Each of the building units 32A and 32B includes an upper chord member 34A, a lower chord member 34B, and a diagonal member 34C, and is formed so as to be able to stand on its own in a state of being laid between a pair of temporary columns 14. This beam-shaped member 30 is constructed as follows, for example. In addition, the construction procedure similar to 1st Embodiment is abbreviate | omitted suitably, and is demonstrated.

  That is, in the lifting process, of the pair of building units 32A and 32B obtained by dividing the beam-shaped member 30 along the material axis direction, one building unit 32A is lifted by the lifting machine 16, and the pair of temporary columns 14 Place on top. Next, of the pair of building units 32A and 32B, the other building unit 32B is lifted by the lifting machine 16 and placed on the one building unit 32A. Thereby, the other construction unit 32B is placed on the pair of temporary columns 14 via the one construction unit 32A. The pair of building units 32A and 32B are independent.

  Next, in the connecting step, the upper chord member 34A of one construction unit 32A and the lower chord member 34B of the other construction unit 32B are connected by welding, a bolt (not shown), or the like. Thereby, the beam-like member 30 is formed.

  Next, the operation of the second embodiment will be described.

  In this embodiment, the beam-like member 30 is divided into a pair of building units 32A and 32B in the vertical direction along the material axis direction. As a result, as in the first embodiment, the weight of each of the building units 32A and 32B is substantially half (approximately 1/2) of the beam-like member 30, so the material axis direction of the pair of building units 32A and 32B. The length L can be increased. Therefore, since the space | interval L of the temporary support | pillar 14 which supports a pair of construction unit 32A, 32B can be expanded, the effort of temporary installation, removal work, etc. of the temporary support | pillar 14 is reduced.

  Moreover, in this embodiment, the other construction unit 32B is mounted on one construction unit 32A. Therefore, when connecting a pair of construction units 32A and 32B, one lower construction unit 32A can be used as a work floor (scaffold). Therefore, the workability is improved.

  Next, a third embodiment will be described. In addition, about the thing of the same structure as 1st, 2 embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 7 shows a front view (cross-sectional view) of the beam-like member 40 according to the third embodiment from the material axis direction. In the beam-like member 40, a pair of building units 22A and 22B divided in the left-right direction are connected to each other via an upper surface reinforcing plate 50 and a lower surface reinforcing plate 52 as reinforcing plates.

  Specifically, the upper surface reinforcing plate 50 and the lower surface reinforcing plate 52 are formed of steel plates or the like. The upper surface reinforcing plate 50 is provided over the upper surfaces of the pair of construction units 22A and 22B, and is joined to each construction unit 22A and 22B by welding or a bolt (not shown). Similarly, the lower surface reinforcing plate 52 is provided over the lower surfaces of the pair of building units 22A and 22B, and is joined to the building units 22A and 22B by welding or a bolt (not shown). Accordingly, the pair of building units 22 </ b> A and 22 </ b> B are connected to each other via the upper surface reinforcing plate 50 and the lower surface reinforcing plate 52.

  Further, a side reinforcing plate 54 is joined to one side surface of each construction unit 22A, 22B by welding or a bolt (not shown). The side reinforcing plate 54, the upper surface reinforcing plate 50, and the lower surface reinforcing plate 52 are joined to each other at the corners of the beam-like member 40. Thus, a closed cross section is formed by the side reinforcing plate 54, the upper surface reinforcing plate 50, and the lower surface reinforcing plate 52. This beam-like member 40 is constructed as follows, for example.

  For example, in the example shown in FIG. 8A, the upper surface reinforcing plate 50, the lower surface reinforcing plate 52, and the side surface reinforcing plate 54 are provided in advance on the upper surface, the lower surface, and one side surface of the pair of building units 22A and 22B. ing. The upper surface reinforcing plate 50 and the lower surface reinforcing plate 52 are divided into two upper surface reinforcing plates 50A and 50B and lower surface reinforcing plates 52A and 52B in the left-right direction, similarly to the pair of building units 22A and 22B. .

  In the lifting process, the pair of building units 22 </ b> A and 22 </ b> B are respectively lifted by the lifting machine 16 and placed on the temporary support column 14 in order. Next, as shown in FIG. 8B, in the connecting step, the upper surface reinforcing plates 50A and 50B and the lower surface reinforcing plates 52A and 52B of the pair of building units 22A and 22B are welded, bolts not shown, or the like. Join by. As a result, the pair of building units 22 </ b> A and 22 </ b> B are coupled to each other via the upper surface reinforcing plate 50 and the lower surface reinforcing plate 52. Note that the pair of building units 22A and 22B may be appropriately connected by, for example, the connecting member 28 described above (see FIG. 4B).

  Next, the operation of the third embodiment will be described.

  In the present embodiment, as shown in FIGS. 8A and 8B, in the connecting step, the upper surface reinforcing plates 50A and 50B provided on the upper surfaces of the pair of building units 22A and 22B are connected to each other. While joining, lower surface reinforcement board 52A, 52B provided in each lower surface is joined.

  Thus, by joining the pair of building units 22A and 22B via the upper surface reinforcing plate 50 and the lower surface reinforcing plate 52, the pair of building units 22A and 22B are connected while reinforcing the beam-like member 40. Can do.

  Further, by providing the upper surface reinforcing plate 50, the lower surface reinforcing plate 52, and the side surface reinforcing plate 54 on the outer peripheral surface of the beam-like member 40, a so-called semi-monocoque structure is configured. Furthermore, in the present embodiment, a closed cross section that surrounds the beam-shaped member 40 is formed by the upper surface reinforcing plate 50, the lower surface reinforcing plate 52, and the side surface reinforcing plate 54. Thereby, the beam-like member 40 can be reinforced efficiently.

  Further, as shown in FIG. 8A, upper surface reinforcing plates 50A, 50B, lower surface reinforcing plates 52A, 52B, and side surface reinforcing plates 54 are previously joined to the outer peripheral surfaces of the pair of building units 22A, 22B by welding or the like. By doing so, welding work and the like on the temporary support column 14 can be reduced. Therefore, the workability is improved.

  In addition, the connection method of a pair of construction units 22A and 22B is not restricted to what was mentioned above. For example, as shown in FIG. 9A, in the lifting process, the pair of building units 22A and 22B are respectively lifted by the lifting machine 16, and the upper surface of the lower reinforcing plate 52 previously set on the temporary support column 14 is lifted. Placed on.

  Next, as shown in FIG. 9B, the pair of building units 22A and 22B are joined to the lower surface reinforcing plate 52 by welding or the like, and the upper surface over the upper surfaces of the pair of building units 22A and 22B. A reinforcing plate 50 is provided, and a pair of building units 22A and 22B are joined to the upper surface reinforcing plate 50 by welding or the like. Accordingly, the pair of building units 22 </ b> A and 22 </ b> B are connected to each other via the upper surface reinforcing plate 50 and the lower surface reinforcing plate 52.

  In this example, since the lower surface reinforcing plate 52 and the upper surface reinforcing plate 50 and the pair of building units 22A and 22B are separately lifted by the lifting machine 16, the lifting weight of the pair of building units 22A and 22B is reduced. Can do.

  The upper surface reinforcing plate 50, the lower surface reinforcing plate 52, and the side surface reinforcing plate 54 can be omitted as appropriate. For example, the side reinforcing plate 54 may be omitted, and the beam member 40 may be reinforced by the upper surface reinforcing plate 50 and the lower surface reinforcing plate 52. Further, the upper surface reinforcing plate 50 and the lower surface reinforcing plate 52 may be omitted, and the beam-shaped member 40 may be reinforced by the side surface reinforcing plate 54. Furthermore, the upper surface reinforcing plate 50, the lower surface reinforcing plate 52, and the side surface reinforcing plate 54 are not limited to metal plates such as steel plates, and may be formed of, for example, PC plates.

  Next, modified examples of the first to third embodiments will be described. In the following, various modified examples will be described by taking the first embodiment as an example, but these modified examples are also applicable to the second and third embodiments as appropriate.

  In the said 1st Embodiment, although the beam-shaped member 20 was divided | segmented into the two construction units 22A and 22B in the left-right direction, the example was not restricted. For example, the beam-like member 20 may be divided into three or more construction units in the left-right direction. Further, the beam-like member 20 can be divided (eg, divided into four parts) in the left-right direction and the up-down direction, for example.

  Moreover, although the said 1st Embodiment showed the example which joined the some beam-shaped member 20 to the material-axis direction, and formed the bridge 10, it does not restrict to this. At least a part of the bridge 10 can be formed by the beam-like member 20. That is, a part of the bridge 10 may be appropriately assembled on the temporary support column, and the remaining part may be formed by the beam-shaped member 20, or the entire bridge 10 may be formed by one beam-shaped member 20.

  Moreover, in the said 1st Embodiment, although the example which mounted a pair of construction units 22A and 22B on the temporary support | pillar 14 as a support | pillar was shown, it does not restrict to this. For example, the pair of building units 22A and 22B may be placed on the main column as a column without using the temporary column 14.

  For example, as shown in the upper left side of FIG. 10, the beam-like member 20 may be appropriately reinforced. In this example, a reinforcing member 60 that connects the intersecting portions 24E of the diagonal members 24C and 24D (see FIG. 3) is provided. In this way, when the diagonal members 24C and 24D intersect in an X shape in a side view, the reinforcing member 60 is easily provided. Therefore, the degree of freedom of reinforcement of the beam-like member 20 is improved.

  Further, as described above in the third embodiment, the upper surface reinforcing plate 50 and the lower surface reinforcing plate 52 may be provided only on the upper surface and the lower surface of the beam-like member 20 as shown in the upper center of FIG. Furthermore, as shown in the upper right side and the lower stage of FIG. 10, the beam-like member 20 may have a partial cross-sectional structure in which a part of its cross section is cut.

  In the first embodiment, the steel beam-like member 20 has been described as an example. However, the beam-like member may be RC, SRC, or the like.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

10 Bridge 12 Main column (post)
14 Temporary support (support)
16 Lifter 20 Beam-shaped member 20A Beam-shaped member 20B Beam-shaped member 20C Beam-shaped member 22A Building unit 22B Building unit 30 Beam-shaped member 32A Building unit 32B Building unit 40 Beam-shaped member 50 Upper surface reinforcing plate (reinforcing plate) )
50A Top surface reinforcing plate (reinforcing plate)
50B Upper surface reinforcement plate (reinforcement plate)
52 Bottom Reinforcement Plate (Reinforcement Plate)
52A Bottom plate (reinforcement plate)
52B Bottom reinforcement plate (reinforcement plate)

Claims (2)

A lifting process in which a plurality of building units obtained by dividing a beam-shaped member along the material axis direction are respectively lifted by a lifting machine and placed on a column,
On the support column, connecting the adjacent building units, and forming the beam-shaped member,
A beam-shaped member construction method comprising: In the connecting step, the reinforcing plates provided on the outer peripheral surfaces of the adjacent building units are joined to each other, or the reinforcing plates are provided over the outer peripheral surfaces of the adjacent building units, Joining each construction unit,
The beam-shaped member construction method according to claim 1.