JP2007064636A - Sc structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a steel plate block including a tie-bar in a factory, to dispose an apparatus buried article easily on the site, to thereby facilitate construction, and to reduce a manufacturing product amount and a connection work amount on the site. <P>SOLUTION: A pair of facing steel plates 11 with studs are connected together with many tie-bars 12 disposed between the plates, to thereby manufacture the steel plate block 13 in the factory. In this case, at least a part of tie-bars 12 are connected detachably by bolt fastening or the like. Tie-bars 12 on necessary spots are mounted on internal space parts of the steel plate block 13, and the apparatus buried article such as a wire conduit 14 is disposed on the site. Then, concrete 15 is filled. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an SC structure applied to, for example, a building structure of a nuclear power plant and a construction method thereof.

  For building structures such as nuclear power plants that need to shield radiation, such as building walls and floors, SC structures that combine steel and concrete with high radiation shielding are generally used. . When the SC structure is applied to a wall body, a full SC structure having steel plates on both sides of the wall body is adopted. When applied to the floor, a half SC structure body in which the floor is a steel plate and the reinforcing bars are arranged on the floor. Is adopted. In the full SC structure, tie bars are arranged at a pitch of about 400 mm in order to connect the steel plates on both side surfaces of the wall, and no tie bars are arranged in the half SC structure constituting the floor.

  On the other hand, the SC structure is also applied to a beam column structure such as a turbine generator base. In the example of the turbine generator base, the pillar has a full SC structure in which one side of the cross section is about 2 to 4 m and four sides are surrounded by a steel plate having a thickness of about 20 mm. A tie bar for connecting steel plates facing each other is disposed on the SC structure column.

  The uppermost beam of the turbine generator base is installed with a turbine and generator, with a cross section of about 2 to 4 m in width and 3 to 5 m in length. The side and bottom of the beam are made of steel, and reinforcing bars are placed on the top of the beam. A structure called a half SC beam structure is adopted. Also in the case of the half SC beam structure, there are steel plates on both side surfaces, and therefore tie bars are disposed between them. In addition, the full SC structure may be employ | adopted for a beam like a column.

  Walls, floors, or beams composed of SC structures are provided with equipment-embedded products including electric pipes and other piping inside. In the construction of this equipment buried item, in the case of the half SC structure constituting the floor of the building, since the tie bar is not arranged, the equipment buried item is locally installed like the deck plate structure in the conventional RC structure. Construction can be carried out, but in a full SC structure or half SC beam structure in which steel plates are arranged on both sides, a jungle gym or the like is caused by the presence of tie bars or studs arranged between a pair of steel plates. It is in a situation, and it is difficult to dispose the equipment buried items.

  As a construction method of the device embedded product in the SC structure, there is one described in Patent Document 1. In this patent document 1, a steel plate block is manufactured by connecting a pair of steel plates with studs constituting both sides of a wall body with a large number of tie bars in a factory, and concrete is filled in the internal space of the steel plate block at the site. A method for burying equipment embedded in an SC structure configured as described above is disclosed.

  In the conventional SC structure disclosed in Patent Document 1, a steel plate with studs having a large number of studs welded on one side faces each other, and a plurality of tie bars disposed between the pair of steel plates with studs are stud-welded or brazed. The steel plate block is manufactured by connecting by welding, and on the site, the steel plate block is installed on the foundation and connected in the vertical and horizontal directions, and then the interior space is filled with concrete.

  A pair of stud-attached steel plates constituting the steel plate block is provided with casings extending in a perpendicular direction, and adjacent steel plate blocks are connected by welding these casings. An opening is formed by cutting out a part of the housing of the steel plate with stud, and the unit connection box divided into two parts is attached by welding or the like using the housing and the opening. In this unit connection box, through holes are formed in the lateral wall, and attachment pieces for attaching lids are provided above and below the opening side.

  Adjacent steel plate blocks are constructed by connecting the casing parts by welding or the like in contact with each other. In the connected state, the unit connection boxes facing each other are also brought into close contact with each other to form one connection box. .

  Electric conduits are respectively connected to the through holes formed in the lateral wall of the connection box, and are stably and reliably fixed to the connection box. In addition, the other connection part of a steel plate block is comprised similarly, and the other end part of a conduit tube is connected to the connection box similarly.

Manufacture of the unit pipes for connecting the conduits and conduits in these steel plate blocks is performed at the stage of manufacturing the steel plate blocks in a factory. In the case of a wall body, the steel plate block is manufactured by connecting a diver to a pair of steel plates with studs by welding such as saddle welding or stud welding. The conduit and the unit connection box are disposed and fixed before the tie bar is connected to the steel plate with the stud. Then, the steel plate blocks are transported to the site, where a number of steel plate blocks are connected in the vertical and horizontal directions, and adjacent steel plate blocks are connected to form a connection box. After that, concrete is placed in the internal space of the steel plate block. The SC structure is formed by filling and burying the conduit and connection box.
Japanese Patent Laid-Open No. 2002-281539

  By the way, as shown in the above-mentioned example, in the case of disposing equipment embedded items such as electric pipes in the SC structure, in the factory, unit connection boxes, electric pipes, etc. are attached in advance to the steel plate with studs, At the site, a connection box is formed, and the cable extension work is performed for each steel plate block using the connection box. Even when the conduit is installed in a factory, a connecting portion of the conduit in the field is generated for each steel plate block, and a work hole for the connection is required.

  Furthermore, when it is a condition that the steel plate block is transported to the site, the width of the steel plate block must be within 2.5m in accordance with the relevant laws of the road. It will exist at a pitch of 2.5m, and there will be an on-site connection for every 2.5m in buried conduits and other piping, resulting in an increase in the amount of products and on-site connection work compared to conventional RC structures. To do.

  Steel plate blocks may be manufactured in several factories. In this case, it is necessary to transport materials such as conduits and pipes to each factory in order to install equipment buried items such as conduits at the factory production stage. Are also distributed, which increases costs, such as complicating materials management and increasing transportation costs. Furthermore, it is necessary to dispatch workers to install equipment buried items to each factory, which complicates the securing and management of workers.

  On the other hand, after mounting equipment buried items locally, as with wooden formwork in conventional RC structures, so that installation of equipment buried items to steel plate blocks is stopped at the factory and installed locally If the construction method for carrying out the work of attaching the tie bar is adopted, the construction period at the site becomes longer and the merit of adopting the SC structure is lost.

  The present invention was made in order to solve the above-mentioned problems. A steel plate block including a tie bar is manufactured in advance, and an embedded device can be easily disposed on site, so that construction is easy and manufactured. An object of the present invention is to obtain an SC structure that can reduce the amount of material and the amount of on-site connection work, and its construction method.

  In order to solve the above-described problems, an SC structure according to the present invention has a tie bar disposed between a pair of opposed steel plates with studs, and connects these steel plates to produce a steel plate block. In an SC structure in which equipment is embedded in the part and filled with concrete, at least a part of the tie bar is detachably connected to the steel plate with stud.

  The SC structure construction method according to the present invention includes a steel plate block manufacturing process in which a pair of opposing steel plates with studs are connected using a detachable tie bar disposed therebetween, and a steel plate block is manufactured. A transport process for transporting the steel plate block to the site after the block manufacturing process, a tie bar removing process for removing the removable tie bar after the transport process, and an equipment in the internal space of the steel plate block after the tie bar removing process An embedded product disposing step for disposing an embedded product, a steel plate block regenerating step for regenerating the steel plate block by refastening the detachable tie bar after the embedded product disposing step, and a steel plate block regenerating step. And a concrete filling step of filling concrete into the steel plate block later.

  According to the SC structure of the present invention and the construction method thereof, the construction is facilitated, and the amount of products and the amount of connection work at the site can be reduced by attaching the embedded device in advance.

  Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view showing an SC structure according to a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a portion A of FIG. In FIG. 1 and FIG. 2, the SC structure in the present embodiment is a steel plate block 13 in which a pair of opposed steel plates 11 and 11 with studs are connected by a number of tie bars 12 disposed therebetween. A device 15 such as a conduit 14 is disposed in the internal space of the steel plate block 13 and filled with concrete 15.

  Here, the pair of stud-attached steel plates 11, 11 are provided with a large number of studs 11a welded on one side, and a peripheral body (not shown) is provided on the periphery. Further, a gusset plate 11b extending in the vertical direction is welded to the surface of the steel plate 11 with stud provided with the stud 11a.

  In the present embodiment, the tie bars 12 that connect the pair of steel plates 11 with studs 11 are detachably attached to the gusset plates 11b by bolts 16 at both ends. The steel material of the tie bar 12 can be a flat bar, an angle material, a channel material, a round bar or the like.

  A plurality of steel plate blocks 13 having such a configuration are transported to the site, installed on the foundation and mounted in the vertical and horizontal directions, and the adjacent steel plate blocks 13 are welded to perform local assembly. In this local assembly, equipment embedded items such as the conduit 14 and other pipes are disposed in the internal space of the steel plate block 13. At this time, the tie bar 12 is removed as necessary at a portion that has an influence on the disposition work, and a state in which the disposition work of the device-embedded product can be easily performed is ensured. The horizontally-drawn equipment-embedded product is disposed from the side of the steel plate block 13, and the equipment-embedded product that runs in the vertical direction is disposed from the steel plate block 13.

  In this way, after incorporating the device-embedded product in the local assembly, the tie bar 12 that has been removed only at the necessary locations for the device-embedded work is fastened again with the bolts 14 to restore the connection. The connection recovery operation of the tie bar 12 can be efficiently carried out in order from the bottom to the top in the same manner since the connection of the plurality of steel plate blocks 13 proceeds from the bottom to the top in the operation of disposing the equipment embedded items. .

  In addition, some pipes to be buried need to be provided with a gradient, and the installation position may be limited. In order to cope with such a case, when the tie bar 12 is configured to be detachable, it is necessary to set the position of the tie bar 12 in advance so as to avoid interference with the device-embedded product. Alternatively, the shape of the bolt insertion hole through which the bolt 16 of the gusset plate 11b shown in FIG. 1 is inserted is an oval (may be oval) larger than the diameter of the bolt 16, and the position of the tie bar 12 can be moved somewhat. It can also be configured and dealt with.

  In addition, if the location of the device-embedded product is known in advance, the affected tie bar 12 is put into a detachable temporary fastening state from the factory production stage, and the other tie bar 12 is fixed by welding. As a result, it is possible to further improve the efficiency of the equipment embedded work at the local assembly stage. To that end, it is necessary to divide the tie bar as a reinforcing material structurally necessary for maintaining the shape of the steel plate block and the tie bar that needs to be added to receive the concrete placing load on site. is there. In general, the reinforcing material to maintain the shape of the steel plate block and the structural material that receives the concrete casting load are combined, but the steel plate block is transported from the factory to the site and mounted on site. By securing the tie bar 12 as the minimum necessary reinforcing material to maintain the shape by the time, only the tie bar necessary for receiving the concrete pouring load can be temporarily secured. Interference can be avoided.

  In addition, since the conduit 14 and other piping have a straight portion and a bent portion, and a general bent portion is provided with a connecting portion, it is not necessary to make all the tie bars 12 detachable. Absent. It is also possible to make the tie bar 12 detachable so as to be limited to only the part that interferes when mounting the device-embedded product or the part that performs the connecting operation of the connecting part.

  The steel plate block 13 including the tie bar 12 which is configured to be at least partially detachable in this way is manufactured at the factory, and the steel plate drilling necessary for installing the equipment embedded product is carried out at the factory. After the steel plate block 13 has been transported to the site, the installation work of the equipment embedded product is carried out at the site assembly stage. At the local assembly stage, the place where the tie bar 12 needs to be removed for the placement of the equipment embedded part corresponds to the detachable structure of the tie bar 12 even after the steel plate block 13 is manufactured.

  In other words, if the tie bars are connected by welding as in the past, the tie bars cannot be removed after the steel plate block has been manufactured. If you want to cut it, you will need to re-weld the tie bar on site to restore it. In contrast, in the present embodiment, even after the steel plate block 13 is manufactured, the tie bar 12 can be easily removed and fastened and restored, so that the construction of the SC structure can be facilitated and the construction period can be shortened. In addition, since the installation work of the equipment-embedded product can be carried out locally, it is not necessary to provide a connection box or configure a work opening, and the amount of product and the amount of connection work at the site can be reduced.

  In addition, when manufacturing steel plate blocks 13 at several factories, it is possible to reduce the cost of transporting equipment embedded materials to each factory and to eliminate the need for dispatch of workers, thereby reducing labor costs. Can do.

  FIG. 3 is a cross-sectional view showing a steel plate block used in the SC structure according to the second embodiment of the present invention. 4 is an enlarged cross-sectional view showing a portion B of FIG. FIG. 5 is an enlarged plan view showing a portion C of FIG. 3 to 5, in the present embodiment, instead of fastening with the bolts 16 shown in FIG. 1, the tie bar of the steel plate block 23 has a two-part configuration composed of the divided tie bars 12a and 12b, and the divided tie bars 12a and 12b are respectively provided. One end of each tie bar is rotatably connected to a gusset plate 11b of a steel plate with stud 11 by a pin 17, and the other end of each divided tie bar 12a, 12b is detachably connected by a bolt, for example, via a connecting plate. The structure is such that it is connected by a mechanical joint 18 so that the divided tie bars 12a and 12b can be separated, moved, and fastened.

  FIG. 6 is a cross-sectional view showing a steel plate block used in the SC structure according to the third embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view of a portion D in FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7 and viewed in the direction of the arrow. 6 to 8, the present embodiment is intended for a case where the concrete casting load is relatively small, and an L-shaped notch 11c is provided in a part of the gusset plate 11b of the steel plate block 33. The hole 12c provided in the tie bar 12 is hooked to the notch 11c, and the tie bar 12 is simply hooked so that the tie bar 12 can be easily separated.

1 is a cross-sectional view showing an SC structure according to a first embodiment of the present invention. It is sectional drawing which expands and shows the A section of FIG. It is sectional drawing which shows the steel plate block used for the SC structure based on 2nd Embodiment in this invention. It is sectional drawing which expands and shows the B section of FIG. It is a top view which expands and shows the C section of FIG. It is sectional drawing which shows the steel plate block used for the SC structure based on 3rd Embodiment in this invention. It is sectional drawing which expands and shows the D section of FIG. FIG. 8 is a side view taken along line VI-VI in FIG. 5, which is a cross-sectional view taken along the line VIII-VIII in FIG. 7 and viewed in the direction of the arrows.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Steel plate 11a with stud ... Stud 11b ... Gusset plate 11c ... Notch 12 ... Tie bar 12a, 12b ... Divided tie bar 12c ... Hole 13, 23, 33 ... Steel plate block 14 ... Electric conduit 15 ... Concrete 16 ... Bolt 17 ... Pin 18 ... Mechanical coupling

Claims (3)

  A tie bar is disposed between a pair of opposing steel plates with studs, and these steel plates are connected to produce a steel plate block. Equipment embedded in the internal space of the steel plate block is filled with concrete. In the SC structure, at least a part of the tie bar is detachably connected to the steel plate with studs.   2. The SC structure according to claim 1, wherein the tie bar is detachably connected to the steel plate with a stud by a bolt, and a bolt insertion hole for inserting the bolt is made larger than a bolt diameter. A steel plate block manufacturing process for manufacturing a steel plate block by connecting a pair of opposing steel plates with studs using a detachable tie bar disposed therebetween,
A transporting step for transporting the steel plate block to the site after the steel plate block manufacturing step;
A tie bar removing step for removing the detachable tie bar after the carrying step;
An embedded product disposing step of disposing an equipment embedded product in the internal space of the steel plate block after the tie bar removing step;
A steel plate block regeneration step of regenerating the steel plate block by refastening the detachable tie bar after the buried article disposing step;
Concrete filling step of filling the steel plate block with concrete after the steel plate block regeneration step,
The construction method of SC structure characterized by having.

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