JP7680223B2 - Steel plate concrete structure - Google Patents

Description

The present invention relates to a steel plate concrete structure .

A conventional technique in this field is the construction method for steel plate concrete walls described in Patent Document 1 below. The steel plate blocks used in this construction method are integrated with a pair of front and back steel plate sections that form part of the surface steel plate and a partition section that connects the steel plate sections together. The steel plate blocks are stacked up, concrete is filled inside each steel plate block, and the ends of the outer wall surfaces of the steel plate blocks are joined together to construct a steel plate concrete wall.

Japanese Patent Application Publication No. 61-261550

However, the steel plate blocks used in the construction method of Patent Document 1, although hollow, have a thickness equivalent to the wall thickness of the steel plate concrete wall to be constructed, and are bulky. When the parts used are bulky in this way, the efficiency of transporting the parts from the factory to the construction site decreases, and more space is required to handle and store the parts at the construction site, resulting in a heavy burden in handling the parts.

Therefore, an object of the present invention is to provide a steel plate concrete structure that reduces the burden of handling parts involved in construction.

The steel plate concrete structure of the present invention comprises a pair of surface steel plates, a concrete section made of concrete poured into the space between the surface steel plates, and a partition section that connects the surface steel plates and is embedded in the concrete section. The partition section has a steel upright plate section that is shaped like a plate and rises from each surface steel plate in the out-of-plane direction, and an upright plate connecting section that connects the upright plate sections together.

The vertical plate connecting portion may have a plurality of splice plates arranged to bridge between the vertical plate portions arranged at intervals in the rising direction and intervene in the connection between the vertical plate portions, and the splice plates may be arranged at intervals from each other, and openings penetrating the partition portion may be formed between the splice plates and between the vertical plate portions.

The surface steel plate may have multiple steel surface steel plate parts connected in the in-plane direction, and the connection parts between the surface steel plate parts on one surface steel plate and the connection parts between the surface steel plate parts on the other surface steel plate may be positioned offset from each other in the in-plane direction.

The construction method of the steel plate concrete structure of the present invention is a construction method of a steel plate concrete structure comprising a pair of surface steel plates, a concrete section made of concrete poured into the space between the surface steel plates, and a partition section connecting the surface steel plates and embedded in the concrete section, and comprises a partition section forming process of connecting the upright plate section of a steel plate unit having a steel surface steel plate part that forms at least a part of the surface steel plate and a plate-shaped steel upright plate section that is provided to rise from the surface steel plate part in an out-of-plane direction to the upright plate section of another steel plate unit to form a partition section including a pair of upright plate sections.

The construction method for a steel plate concrete structure may include a steel shell formation process that includes a partition wall formation process and forms a steel shell having a pair of surface steel plates and a partition wall, and a concrete pouring process that pours concrete into the steel shell to form a concrete section.

In the partition wall forming process, the standing plate parts are connected to each other via a plurality of splice plates arranged to bridge between the standing plate parts arranged at intervals in the rising direction, and the splice plates are arranged at intervals to form openings penetrating the partition wall between the splice plates and between the standing plate parts.

The method for constructing a steel plate concrete structure may be carried out by using the opening as a passageway for construction workers.

According to the present invention, it is possible to provide a steel plate concrete structure that reduces the burden of handling parts involved in construction.

FIG. 2 is a perspective view showing a part of a steel plate concrete structural wall according to the present embodiment in a cutaway view. FIG. 2A is a plan view of the steel hull, and FIG. 2B is a side view of the steel hull. 5A is a perspective view showing a method for forming a rib portion, and FIG. 5B is a plan view of a rib member. FIG. 1A is a plan view of a channel material, FIG. 1B is a side view thereof, and FIG. 1C is a perspective view showing a channel material divided into two. 4(a) to 4(c) are diagrams sequentially showing a method for constructing a steel hull. 6(a) to 6(c) are diagrams sequentially showing the method of constructing the steel shell following FIG. 5. 1A is a diagram showing the state in which the steel plate unit is mounted on a vehicle, FIG. 1B is a diagram showing another state in which the steel plate unit is mounted on a vehicle, FIG. 1C is a plan view of the H-beam, and FIG. 1D is a side view thereof. 1A and 1B are side views illustrating a method for forming a through hole in an SC structural wall, and FIG. 1C and 1D are side views illustrating a method for forming a passage opening in an SC structural wall. 13A to 13E are diagrams showing modified examples of dividing a channel material into two parts.

An embodiment of a steel plate concrete structure and its construction method according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing a part of a steel plate concrete structural wall 1 (hereinafter referred to as "SC structural wall 1") according to this embodiment, with a broken part. The SC structural wall 1 is a vertical wall of an earthquake-resistant structure or an aircraft protection structure applied to, for example, the walls of a reactor building in a nuclear power plant. In the following, as shown in the figure, the height direction of the SC structural wall 1 is the Z direction, the wall thickness direction of the SC structural wall 1 is the X direction, and the direction in which the SC structural wall 1 extends horizontally is the Y direction, and X, Y, and Z may be used to explain the positional relationship of each part of the SC structural wall 1 and the positional relationship of each part of the SC structural wall 1.

The SC structural wall 1 comprises a pair of surface steel plates 3 arranged on both the front and back sides of the wall, and a concrete section 5 sandwiched between the surface steel plates 3. The concrete section 5 is made of concrete poured and filled in the space between the surface steel plates 3. The SC structural wall 1 is constructed by constructing a hollow steel shell 7 mainly composed of steel plates, and pouring concrete into the internal space of the steel shell 7. Figure 2 (a) is a plan view of the steel shell 7, and Figure 2 (b) is a side view of the steel shell 7. As shown in Figures 1 and 2, the steel shell 7 has the above-mentioned pair of vertical surface steel plates 3 and vertical partition sections 9 arranged at equal intervals to connect the surface steel plates 3 to each other in the wall thickness direction. Here, as an example, the height of the SC structural wall 1 is about 6 m, the wall thickness is about 2 m, the interval between the partition sections 9 is about 2.4 m, and the thickness of the surface steel plates 3 is about 20 mm. The SC structural wall 1 may be provided with a through hole 51 for inserting piping, etc., or a passage opening 53 for a door to be used as a passageway, which may be provided as appropriate to penetrate the SC structural wall 1 in the X direction.

The surface steel plate 3 is composed of multiple surface steel plate parts 13 connected in the Y direction. The dimension of the surface steel plate parts 13 in the Z direction is approximately 6 m, the same as the height of the SC structural wall 1, and the dimension of the surface steel plate parts 13 in the Y direction is approximately 2.4 m, the same as the distance between the partition sections 9. The surface steel plate 3 is composed of multiple such surface steel plate parts 13 connected in the in-plane direction (Y direction) by bolting via splice plates (also called "splice plates") 15.

Here, two adjacent surface steel plate components 13 are butted against each other at their end faces, and a pair of splice plates 15 that straddle the boundary between the surface steel plate components 13 are installed so as to sandwich the surface steel plate components 13 from the front and back in the X direction. Then, a number of bolts that pass through the surface steel plate components 13 and the pair of splice plates 15 on the front and back are tightened to connect the two surface steel plate components 13 in the in-plane direction. Note that in order to avoid complicating the drawing, the bolts on the splice plates 15 are omitted from FIG. 2. Here, the connection portion between the surface steel plate components 13 on one surface steel plate 3 (hereinafter referred to as the "surface connection portion 13a") and the surface connection portion 13a between the surface steel plate components 13 on the other surface steel plate 3 are positioned offset from each other in the Y direction. That is, the surface connection portions 13a are staggered in the surface steel plates 3 on the front and back of the SC structural wall 1.

On the inner wall surface 3b (the surface on the side where concrete is poured) of each surface steel plate 3, a plate-shaped upright plate portion 17 is provided at a position facing each other across the entire height of the SC structural wall 1 so as to rise vertically toward the other surface steel plate 3. The upright plate portion 17 is welded to the inner wall surface 3b of the surface steel plate 3 in a position perpendicular to the Y direction. The upright plate portion 17 is made of a steel plate with a plate thickness similar to that of the surface steel plate 3. The rise height of the upright plate portion 17 from the inner wall surface 3b in the X direction is about 1/3 of the wall thickness of the SC structural wall 1. The opposing upright plate portions 17 are arranged at a distance in the X direction of about 1/3 of the wall thickness of the SC structural wall 1.

A standing plate connecting portion 21 is provided that connects these standing plate portions 17 to each other via splice plates 19. As a specific configuration of the standing plate connecting portion 21, the standing plate connecting portion 21 has a pair of splice plates 19 that are bridged between the opposing standing plate portions 17. The splice plates 19 face each other in the Y direction, sandwiching each standing plate portion 17 at both ends in the X direction. By tightening a plurality of bolts inserted into the two splice plates 19 and a portion of the standing plate portion 17 sandwiched between them, one end of the two splice plates 19 is connected to one of the standing plate portions 17. Furthermore, by similarly connecting the other ends of the two splice plates 19 to the other standing plate portion 17, the opposing standing plate portions 17 are connected to each other via the two splice plates 19.

The above-mentioned vertical plate connecting portion 21 is provided at three locations for a pair of vertical plate portions 17, and the three splice plates 19 are arranged apart from each other in the Z direction as shown in Figures 1 and 2 (b). The uppermost vertical plate connecting portion 21 is located along the upper end of the SC structural wall 1, and the lowermost vertical plate connecting portion 21 is located along the lower end of the SC structural wall 1. The middle vertical plate connecting portion 21 is located approximately in the center of the two vertical plate connecting portions 21. The above-mentioned pair of vertical plate portions 17 and the three vertical plate connecting portions 21 (vertical plate connecting portions) including the splice plate 19 constitute the above-mentioned partition portion 9. According to such a structure of the partition portion 9, two rectangular openings 23 of approximately the same size that penetrate the partition portion 9 in the Y direction are formed between the splice plates 19 and between the vertical plate portions 17. The width of the opening 23 in the X direction is approximately 600 mm, and the height in the Z direction is approximately 2000 mm, so the opening 23 is large enough for construction workers to pass through.

In addition, in one vertical plate connecting portion 21, a pair of splice plates 19 are used to sandwich the vertical plate portion 17 in the Y direction as described above. Since there is a possibility that the narrow gap between the pair of splice plates 19 will not be filled sufficiently with concrete, as a countermeasure, the gap may be filled with a filler in advance. As the filler, a steel plate of approximately the same thickness as the vertical plate portion 17 may be used. Also, to prevent the formation of the above-mentioned gap, the vertical plate portions 17 may be connected to each other using only one splice plate 19 for one vertical plate connecting portion 21.

On the inner wall surface 3b of each surface steel plate 3, multiple long horizontal rib portions 27 extending in the Y direction are provided in parallel at intervals of, for example, about 1 m. As shown in FIG. 3(a), the horizontal rib portions 27 are formed by welding long steel rib members 28 to the inner wall surface 3b in a horizontal position. The horizontal rib portions 27 rise horizontally from the vertical inner wall surface 3b and have their tips bent vertically upward, forming an L-shaped cross section overall.

As shown in Figures 3(a) and 3(b), the contour shape of the edge 28e of this rib member 28 on the side that is welded to the surface steel plate 3 is uneven. That is, the rib member 28 has multiple protrusions 28a and recesses 28b formed alternately in the longitudinal direction (Y direction) on the edge 28e. The edge 28e is formed so that the contour shape of the protrusions 28a and the contour shape of the recesses 28b are approximately equal to each other.

In this embodiment, the contour line of the tip 28h of the protrusion 28a is a straight line extending in the longitudinal direction of the rib member 28. The protrusion 28a has a narrower longitudinal width as it approaches the edge 28e on the side to be welded, and symmetrically, the recess 28b has a wider longitudinal width as it approaches the edge 28e on the side to be welded. In more detail, the contour shape of the protrusion 28a is a part of a regular hexagon H1 including one side extending in the Y direction, and the side corresponds to the contour line of the tip 28h of the protrusion 28a. The contour shape of the recess 28b is a part of a regular hexagon H2 of the same size as the above, including one side extending in the Y direction, and the side corresponds to the contour line of the bottom of the recess 28b. The rib member 28 is welded to the surface steel plate 3 at the tip 28h of each protrusion 28a.

As shown in Figs. 1 and 2, the inner wall surface 3b of each surface steel plate 3 is provided with a plurality of elongated steel vertical rib portions 29 extending in the Z direction, in parallel with each other at intervals of, for example, about 1 m, in the same manner as the horizontal rib portion 27. The vertical rib portions 29 are formed by welding the rib member 28 to the inner wall surface 3b in a vertical position. Appropriate scallops are formed at each intersection of the horizontal rib portion 27, the vertical rib portion 29, and the standing plate portion 17. The configuration of the vertical rib portion 29 is the same as that of the horizontal rib portion 27, except that the extension direction is vertical, so further redundant explanations will be omitted. Note that in order to avoid complicating the drawing, the uneven shapes of the edges 28e of the horizontal rib portion 27 and the vertical rib portion 29 are omitted in Fig. 2.

As described above, the surface steel plate 3 and the ribbed surface steel plate 6 having the horizontal rib portion 27 and the vertical rib portion 29 provided on the inner wall surface 3b of the surface steel plate 3 are arranged on both surfaces of the SC structural wall 1. The presence of the horizontal rib portion 27 and the vertical rib portion 29 prevents the surface steel plate 3 from buckling, maintains the shape of the surface steel plate 3 during construction, prevents the surface steel plate 3 from becoming flaky when concrete is poured into the internal space of the steel shell 7, and integrates the concrete portion 5 with the surface steel plate 3. Studs and tie bars may be provided on the inner wall surface 3b of the surface steel plate 3, but the studs and tie bars may be omitted. Also, instead of providing the horizontal rib portion 27 and the vertical rib portion 29 on the inner wall surface 3b, studs may be provided on the inner wall surface 3b.

The rib members 28 constituting the horizontal rib portion 27 and the vertical rib portion 29 are manufactured, for example, as follows. First, a long channel member 31 (steel member) is prepared as shown in Figures 4(a) and (b). This channel member 31 is cut in a zigzag pattern in the center of the web portion along a cutting line 31c that corresponds to the contour shape of the convex portion 28a and the concave portion 28b, and divided into two in the short direction. This results in two rib members 28 with an L-shaped cross section as shown in Figure 4(c) (rib member manufacturing process).

As described above, the contour shapes of the convex portions 28a and the concave portions 28b are substantially the same, so that the edges 28e of the two rib members 28 are shaped so that the convex portions 28a of one rib member 28 and the concave portions 28b of the other rib member 28 fit together, and no scraps of the channel material 31 are generated due to the cutting into two pieces. Note that the concept of the contour shapes of the convex portions 28a and the concave portions 28b being "substantially the same" also includes, for example, cases where the dimensions of the convex portions 28a are slightly smaller than the dimensions of the concave portions 28b due to the cutting width of the channel material 31.

Next, an example of a method for constructing the SC structural wall 1 will be described. As shown in FIG. 5(a), a surface steel plate component 13 of a predetermined size is cut out from a steel plate. Next, as shown in FIG. 5(b), a separately prepared steel plate of a predetermined size is welded in a perpendicular position to the inner wall surface 3b of the surface steel plate component 13 to form a standing plate portion 17. The standing plate portion 17 may be installed at the center position in the width direction of the surface steel plate component 13, but in this embodiment, the standing plate portion 17 is installed at a position shifted in the width direction (Y direction) of the surface steel plate component 13 from the center position of the surface steel plate component 13. Also, as described in FIG. 4, a channel material 31 of a predetermined length is divided into two in the short direction to produce a rib member 28 (rib member production process). Then, the tip 28h of the protrusion 28a of the rib member 28 of a predetermined number is welded to a predetermined position on the inner wall surface 3b of the surface steel plate component 13 to form the horizontal rib portion 27 and the vertical rib portion 29 (rib forming process). As mentioned above, there is no need to form studs on the inner wall surface 3b, so there is no need for equipment for stud welding (for example, a large metal surface plate that can be grounded on the entire surface).

Furthermore, as shown in FIG. 5(c), a specified embedded metal fitting 35 is installed by welding on the outer wall surface 3a of the surface steel plate component 13. The embedded metal fitting 35 functions as a mounting base for equipment such as pipes and cables that will be installed on the outer wall of the completed SC structural wall 1. The embedded metal fitting 35 is installed so that its anchor (not shown) penetrates the surface steel plate component 13 and protrudes toward the inner wall surface 3b.

The process up to this point is carried out in a factory separate from the construction site of the SC structural wall 1. That is, a part in which the surface steel plate part 13, the standing plate part 17, the horizontal rib part 27, the vertical rib part 29, and the embedded metal part 35 are integrated is manufactured in the factory as one unit of the steel shell 7 parts as described above. Hereinafter, the above-mentioned one unit part in which one surface steel plate part 13, one standing plate part 17, the horizontal rib part 27, the vertical rib part 29, and the embedded metal part 35 are integrated is called a "steel plate unit 37". After being manufactured in the factory, the steel plate unit 37 is transported to the construction site of the SC structural wall 1 by a truck or trailer or the like. FIG. 7(a) is a view of an example of a truck 41 that transports the steel plate unit 37 from the factory to the construction site, seen from the rear of the vehicle. In this example, the steel plate unit 37 is loaded on the bed of the truck 41 in a position in which the Y direction of the surface steel plate part 13 is approximately vertical. FIG. 7(b) is a view from the rear of the vehicle of another example of a truck 41 that transports the steel plate unit 37 from the factory to the construction site. In this example, the steel plate unit 37 is loaded onto the bed of the truck 41 with the Y direction of the surface steel plate component 13 in a substantially horizontal position.

The steel plate units 37 of the truck 41 are unloaded at the construction site's ground assembly yard. At the ground assembly yard, a steel plate assembly 39 is assembled by combining multiple steel plate units 37. As a specific example, first, as shown in FIG. 6(a), the surface steel plate parts 13 of the three steel plate units 37 are connected in the in-plane direction (Y direction) by bolting using the above-mentioned splice plate 15. Then, two such triple steel plate units 37 are prepared, and three sets of standing plate parts 17 are opposed to each other as shown in FIG. 6(b). Then, the standing plate parts 17 are connected to each other through the splice plate 19 bridged between the three sets of standing plate parts 17 to form a partition wall part 9 (partition wall part formation process). As a result, a box-shaped steel plate assembly 39 is assembled by combining a total of six steel plate units 37. In addition, in order to reduce the work of transporting and installing the electrical and mechanical piping to be installed in the SC structural wall 1, buried electrical and mechanical piping, etc. may be pre-assembled to the steel plate assembly 39.

Next, as shown in FIG. 6(c), the above-mentioned steel plate assembly 39 is hoisted by a large lifting machine and transported to the planned construction position of the SC structural wall 1. Then, while checking the plumbing accuracy, a temporary assembly is performed on the existing steel plate assembly 39, and the surface steel plate parts 13 of each steel plate assembly 39 are bolted together via the above-mentioned splice plate 15, as described above, to assemble the steel plate assembly 39. By repeating this transport and assembly of the steel plate assemblies 39, the steel shell 7 is completed. After that, concrete is poured into the internal space of the steel shell 7 to form the concrete part 5 (concrete pouring process). Here, high-flow concrete may be used to improve the filling property of the concrete. After that, the necessary finishing, painting, etc. are performed, and the SC structural wall 1 is completed.

During the assembly of the steel shell 7, the inspection of the steel shell 7 before concrete is poured, the concrete pouring process, and the like, a construction worker may enter the internal space of the steel shell 7 to perform work. For example, during the concrete pouring process, a construction worker may operate a vibrator in the internal space of the steel shell 7 to compact the concrete. At this time, the construction worker can perform the above-mentioned work while moving in the Y direction in the internal space of the steel shell 7 through the openings 23 of the bulkheads 9 as shown in Figures 1 and 2(b). In addition, to facilitate the movement of such construction workers, a step plate that passes through the openings 23 may be provided between the partitions 9.

As mentioned above, in one steel plate unit 37, as shown in FIG. 5(b), the upright plate portion 17 is installed at a position shifted in the width direction (Y direction) from the center position of the surface steel plate component 13. By combining a large number of the same steel plate units 37 having such a configuration to form a steel shell 7, the above-mentioned configuration is realized in the SC structural wall 1, in which the surface connecting portion 13a (see FIG. 1 and FIG. 2(b)) of one surface steel plate 3 and the surface connecting portion 13a of the other surface steel plate 3 are positioned offset from each other in the Y direction.

Here, the method of forming the aforementioned through hole 51 and passage opening 53 (see FIG. 1) formed in the SC structural wall 1 will be described. As shown in FIG. 8(a), a circular opening is formed in each of the surface steel plate parts 13 of a pair of steel plate units 37 corresponding to the formation position of the through hole 51. Then, a cylindrical end sleeve 52a constituting the vicinity of the end part of the through hole 51 is welded to the inner wall surface 3b so as to rise vertically from the edge of the opening. Since the rise height of the end sleeve 52a is lower than the rise height of the erected plate part 17, the presence of the end sleeve 52a does not excessively increase the bulk of the steel plate unit 37. The opening processing of the surface steel plate part 13 and the welding of the end sleeve 52a as described above are performed, for example, when the steel plate unit 37 is manufactured in a factory.

After that, at the construction site, as shown in FIG. 8(b), the vertical plate sections 17 are connected to each other by the vertical plate connecting sections 21 to form the partition section 9, and then a cylindrical intermediate sleeve 52b of approximately the same diameter as the end sleeve 52a is inserted between the end sleeves 52a. Then, both end faces of the intermediate sleeve 52b are butt-welded to the end faces of the opposing end sleeves 52a, respectively, to form a through hole 51 connecting the surface steel plate parts 13 to each other. The welding of the intermediate sleeve 52b as described above may be performed in the ground assembly yard on the assembled steel plate assembly 39, or may be performed on the steel plate assembly 39 suspended at the planned construction position of the SC structural wall 1.

Similarly, as shown in FIG. 8(c), a rectangular opening is formed at one end of the surface steel plate parts 13 of the pair of steel plate units 37 corresponding to the formation position of the passage opening 53. A passage wall end 54a having a U-shaped cross section and constituting the vicinity of the end of the passage opening 53 is welded to the inner wall surface 3b so as to rise vertically from the edge of the opening. Since the rise height of the passage wall end 54a is lower than the rise height of the erect plate part 17, the presence of the passage wall end 54a does not excessively increase the bulk of the steel plate unit 37. The above-mentioned opening processing of the surface steel plate parts 13 and welding of the passage wall end 54a are performed, for example, when the steel plate units 37 are manufactured in a factory.

After that, at the construction site, as shown in FIG. 8(d), the vertical plate parts 17 are connected to each other by the vertical plate connecting parts 21 to form the partition wall part 9, and then the passage wall intermediate part 54b having a U-shaped cross section is inserted between the passage wall end parts 54a. Then, both ends of the passage wall intermediate part 54b are welded to the ends of the opposing passage wall end parts 54a, respectively, to form the passage opening 53 connecting the surface steel plate parts 13 to each other. The above-mentioned welding of the passage wall intermediate part 54b may be performed on the assembled steel plate assembly 39 at the ground assembly yard, or may be performed on the steel plate assembly 39 hung at the planned construction position of the SC structural wall 1. For example, here, the passage wall intermediate part 54b, which is slightly larger in size than the passage wall end part 54a, may be installed so that both ends overlap the outside of the passage wall end part 54a, and the passage wall end part 54a and the passage wall intermediate part 54b may be welded. Alternatively, the passage wall end portion 54a and the passage wall middle portion 54b, which are of the same size, may be butt welded together.

Next, we will explain the effects of the SC structural wall 1 and its construction method described above.

The bulkhead portion 9 of the steel shell 7 in the SC structural wall 1 has a vertical plate portion 17 rising from each surface steel plate 3 and a vertical plate connecting portion 21 connecting the vertical plate portions 17 to each other. In the bulkhead forming process for forming the bulkhead portion 9, the vertical plate portions 17 are connected to each other by the vertical plate connecting portion 21 to form the bulkhead portion 9 including a pair of the vertical plate portions 17 and the vertical plate connecting portion 21. With this configuration, before being connected by the vertical plate connecting portion 21, the vertical plate portions 17 constituting the bulkhead portion 9 are separated in the wall thickness direction (X direction) of the SC structural wall 1. Therefore, the parts of the SC structural wall 1 can be separated into a part on one surface steel plate 3 side having one vertical plate portion 17 and a part on the other surface steel plate 3 side having the other vertical plate portion 17. The dimensions in the X direction of these parts (steel plate unit 37 in this embodiment) are kept smaller than the wall thickness of the SC structural wall 1. As a result, the bulk of the SC structural wall 1 components can be kept small, reducing the burden of handling the components involved in construction. Furthermore, the small bulk of the components improves the efficiency of transporting the components from the factory to the construction site, and also reduces the space required for handling and storing the components at the construction site. Furthermore, when these components are manufactured in a factory, their small bulk makes it easy to handle the components at the factory, improving the efficiency of component manufacturing.

In particular, the partition wall 9 has a structure in which the vertical plate portions 17 spaced apart in the X direction are connected to each other by a splice plate 19, so that the dimension of the vertical plate portion 17 in the X direction is further reduced. As a result, the bulk of the steel plate unit 37, which is a part of the SC structural wall 1, is particularly reduced, and the burden of handling the steel plate unit 37 is particularly reduced. For example, the dimension of the steel plate unit 37 in the X direction is approximately equivalent to the rise height of the vertical plate portion 17 from the inner wall surface 3b, that is, as described above, is reduced to about 1/3 of the wall thickness of the SC structural wall 1. For example, if the wall thickness of the SC structural wall 1 is about 2 m, the dimension of the steel plate unit 37 in the X direction is about 0.7 m. The dimension of the steel plate unit 37 in the Z direction corresponds to the dimension of the surface steel plate part 13 in the Z direction, which is about 6 m, and the dimension in the Y direction corresponds to the dimension of the surface steel plate part 13 in the Y direction, which is about 2.4 m.

2(b), in the partition 9, the vertical plate portions 17 are spaced apart in the X direction, and the splice plates 19 are also spaced apart in the Z direction, so that an opening 23 is formed through the partition 9 as described above. The opening 23 can be used as a passageway for workers to move around during work, and the workers can use the opening 23 to move efficiently and safely in the Y direction while working, improving work efficiency and safety. If the opening 23 did not exist, the workers would have to return to the top of the steel shell 7, for example, when moving in the Y direction beyond the partition 9, which would be inefficient. The opening 23 also functions as a flow path for the concrete to flow in the Y direction during the concrete pouring process, and contributes to improving the integrity of the concrete portion 5 and the steel shell 7.

Each of the pair of surface steel plates 3 of the SC structural wall 1 is formed by connecting multiple surface steel plate parts 13 in the Y direction. The surface connecting parts 13a of one surface steel plate 3 and the surface connecting parts 13a of the other surface steel plate 3 are positioned offset from each other in the Y direction. By staggering the surface connecting parts 13a in this way, the surface connecting parts 13a that could become weak points are distributed in the Y direction on the front and back of the SC structural wall 1.

Bolt fastening is used to connect the surface steel plate components 13 in the Y direction. In addition, bolt fastening is also used to connect the upright plate sections 17 via the splice plate 19 when forming the bulkhead section 9. Therefore, the steel shell 7 can be formed at the construction site by combining the steel plate units 37 with bolt fastening, and the work of welding steel plates at the construction site is reduced. When joining steel plates by welding at the construction site, the welding work and welding inspection often take longer than with bolt fastening, and may also be affected by weather, so the welding process may become a critical path. Therefore, by reducing the welding work at the construction site, the construction period can be shortened. In addition, the burden of securing welding engineers is also reduced.

Generally, the width of objects to be transported by vehicle is required to be kept to approximately 2.4 m or less, so it is conceivable to set the Y-direction dimension of the steel plate unit 37 (the Y-direction dimension of the surface steel plate component 13) to 2.4 m or less to meet this restriction. In contrast, if the transportation method shown in Figure 7 (a) described above is adopted, even if the Y-direction dimension of the steel plate unit 37 increases, there is almost no effect on the vehicle width direction. Therefore, it may be possible to expand the Y-direction dimension of the surface steel plate component 13 of the steel plate unit 37 (for example, to 2.4 m or more). Furthermore, if the Y-direction dimension of the surface steel plate component 13 is expanded, the number of surface connecting parts 13a in the steel shell 7 will decrease, and the work of connecting the surface steel plate components 13 to each other will be reduced.

In addition, in the ribbed surface steel plate 6 of the SC structural wall 1, a long rib member 28 is welded to the inner wall surface 3b of the surface steel plate 3 to form a horizontal rib portion 27 and a vertical rib portion 29. This rib member 28 has multiple convex portions 28a and concave portions 28b formed alternately in the longitudinal direction at the edge portion 28e on the surface steel plate 3 side, and the tip portion 28h of each convex portion 28a is welded to the inner wall surface 3b. With this configuration, the welded portions of the rib member 28 to the surface steel plate 3 are intermittent in the longitudinal direction, and the length of the welded portion is shorter than when the rib member is welded over the entire length. Therefore, welding distortion caused in the surface steel plate 3 due to welding of the rib member 28 is reduced.

In addition, in the horizontal rib portion 27, through holes are formed in the area surrounded by each recess 28b and the inner wall surface 3b. In the concrete pouring process, the through holes function as air vent holes, reducing the possibility of air bubbles remaining on the underside of the horizontal rib portion 27. This prevents the deterioration of concrete filling properties caused by the horizontal rib portion 27. In the concrete pouring process, the scallops appropriately formed at the intersections of the horizontal rib portion 27, the vertical rib portion 29, and the standing plate portion 17 also function as air vent holes.

In addition, in the rib member 28, the convex portion 28a and the concave portion 28b have approximately the same contour shape. With this configuration, when the two rib members 28 are placed face to face, the convex portion 28a of one rib member 28 and the concave portion 28b of the other rib member 28 are shaped to fit together. Therefore, when manufacturing the rib member 28, as shown in FIG. 4, one channel material 31 is cut in a zigzag pattern along a cutting line 31c that corresponds to the contour shapes of the convex portion 28a and the concave portion 28b, and divided into two in the short direction, so that two rib members 28 of the same configuration can be manufactured. In this case, no offcuts of the channel material 31 due to cutting are generated, so that material waste can be reduced.

The uneven shape of the rib member 28 is not limited to the shape shown in Figs. 3 and 4 in this embodiment, and may be any of the shapes shown in Figs. 9(a) to 9(e). The contours of the convex portion 81a and the concave portion 81b in Fig. 9(a) are rectangular. The convex portion 82a in Fig. 9(b) expands in the longitudinal direction toward the side to be welded, and the concave portion 82b contracts in the longitudinal direction toward the side to be welded. The contours of the convex portion 83a and the concave portion 83b in Fig. 9(c) are part of an arc. The contours of the convex portion 84a and the concave portion 84b in Fig. 9(d) are part of an ellipse with a major axis in the longitudinal direction. The convex portion 85a and the concave portion 85b in Fig. 9(e) are mountain-shaped with a straight contour.

The contour shapes of the protrusions 28a and recesses 28b described above as an example form parts of regular hexagons H1 and H2, each including one side extending in the longitudinal direction, as described in FIG. 3(b). With this configuration, the cutting line 31c is short and formed as a straight line, so that cutting of the channel material 31 is relatively easy. Also, since the contour line of the tip 28h of the protrusion 28a is formed as a straight line extending in the longitudinal direction of the rib member 28, the tip 28h of the protrusion 28a can be welded in surface contact with the inner wall surface 3b.

The present invention can be implemented in various forms, including the above-described embodiment, with various modifications and improvements based on the knowledge of those skilled in the art. It is also possible to configure modified examples by utilizing the technical matters described in the above-described embodiment. The configurations of each embodiment, etc. may be used in appropriate combination.

For example, the method of connecting the surface steel plate parts 13 in the Y direction is not limited to bolting, but may be welding, or a hybrid joint of bolting and welding. The method of connecting the standing plate part 17 and the splice plate 19 is not limited to bolting, but may be welding, or a hybrid joint of bolting and welding. As for the above hybrid joint, welding may be performed in the base assembly yard and bolting may be performed during on-site assembly. In this case, if there is room in the base assembly yard, the surface steel plate parts 13 may be laid flat (in a position where the X direction of the surface steel plate parts 13 is the up-down direction) and welding may be performed by downward welding.

In this embodiment, as shown in Fig. 6(b) and Fig. 6(c), the steel plate assembly 39 for suspending the SC structural wall 1 at the planned construction position is configured as a box by combining six steel plate units 37, but this steel plate assembly 39 is not limited to the structure shown in Fig. 6(b) and Fig. 6(c). For example, if there is an obstacle such as a beam directly above the planned construction position of the bulkhead portion 9 of the SC structural wall 1, the steel plate assembly 39 may be configured not to include the bulkhead portion 9 so as to suspend the assembly without interfering with the obstacle. As the steel plate assembly 39 without the bulkhead portion 9, for example, as shown in Fig. 6(a), multiple steel plate units 37 may be suspended in a state connected in the Y direction. Also, for example, the number of steel plate units 37 included in the steel plate assembly 39 may be determined within the range that can be lifted depending on the capacity of a large lifting machine for suspending the steel plate assembly 39. Also, it is not necessary to suspend the steel plate assembly 39, which is a combination of multiple steel plate units 37; the steel plate units 37 may be suspended one by one.

The shapes of the horizontal rib portion 27 and the vertical rib portion 29 are not limited to an L-shaped cross section, and may be, for example, a T-shaped cross section. In this case, as shown in Figures 7(c) and 7(d), instead of the channel material 31, the rib member 28 may be manufactured by cutting an H-shaped steel 32 in a zigzag pattern in the short direction. The horizontal rib portion 27 and the vertical rib portion 29 may also be in the shape of a flat plate. In this case, the rib member 28 may be manufactured by cutting a long flat plate in a zigzag pattern in the short direction.

In the embodiment, an example of applying the present invention to an SC structural wall 1 has been described, but the present invention can also be applied to an SC structural floor. In this case, the SC structural floor may have a structure in which the above-mentioned SC structural wall 1 is rotated 90° around the Y axis. In this case, a pouring hole for pouring concrete may be provided in the surface steel plate 3 corresponding to the upper surface of the SC structural floor. In this case, by reinforcing the area around the pouring hole in advance, the pouring hole does not need to be blocked after pouring the concrete.

1...SC structural wall (steel plate concrete structure), 3...surface steel plate, 5...concrete section, 7...steel shell, 9...partition wall section, 13...surface steel plate part, 13a...surface connecting section, 17...standing plate section, 19...splicing plate, 21...standing plate connecting section, 23...opening, 37...steel plate unit.

Claims (3)

A pair of surface steel plates;
A concrete portion made of concrete poured in the space between the surface steel plates;
A partition wall portion that connects the surface steel plates to each other and is embedded in the concrete portion;
A rib portion is provided on the surface of the surface steel plate on the side where concrete is poured and embedded in the concrete portion,
The partition wall portion has a pair of plate-shaped steel upright plate portions that are provided so as to rise from each of the surface steel plates in an out-of-plane direction and intersect with the rib portion and are arranged at intervals from each other in the rising direction, and a pair of splice plates that sandwich each of the upright plate portions in the thickness direction and a filler filled in the gap between the splice plates, and a upright plate connecting portion that connects the upright plate portions to each other,
The upright plate portion rises from the surface steel plate at a rising height greater than that of the rib portion,
The plurality of splice plates arranged at intervals in the height direction are bolted to the upright plate portion with both ends in the rising direction aligned in the height direction,
A steel plate concrete structure, in which the splice plates of at least some of the upright plate connection portions are bolted to portions of the upright plate portions that protrude beyond the rib portions in the rise direction of the upright plate portions. 2. The steel plate concrete structure according to claim 1, wherein openings penetrating the partition wall are formed between the adjacent splice plates and between the adjacent upright plate portions arranged at intervals in the height direction . The surface steel plate has a plurality of steel surface steel plate parts connected in an in-plane direction,
A steel plate concrete structure as described in claim 1 or 2, wherein the connection portions between the surface steel plate components in one of the surface steel plates and the connection portions between the surface steel plate components in the other surface steel plate are positioned offset from each other in the in-plane direction.

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