JP6218843B2 - Wall material for prefabricated building - Google Patents

Description

  The present invention relates to a wall material formed as a precast concrete material for constructing a building. The invention further relates to a building built using this type of wall material, in particular a driving or facility building of a nuclear power plant.

  Buildings of nuclear facilities that require safety, for example, buildings that contain emergency generators, have been built with on-site concrete structures almost without exception. In this nuclear field, the load level is so high that the prefabricated methods that have been proven in the construction of ordinary residential buildings are rarely used in practice so far.

That is, the building / structure in the nuclear field must withstand all the loads of the following events and their combined loads by group EVI (internal action) and group EVA (external action).
Normal operation:
・ Constant load ・ Varying load including transportation and installation load ・ Effect of man-made events outside compound load:
・ Explosion ・ Aircraft crash ・ External fire
・ Fire during internal operation ・ Collapse of internal structures ・ Falling objects ・ Internal overflow ・ Internal explosion abnormal situations:
・ Earthquakes, storms, heavy snowfall and freezing, tornado load, direct impact of tornado, extreme outside temperature, heavy floods, heavy rain, security (nuclear material protection)
Explosive pressure wave Explosive gas cloud

  The use of prefabricated construction materials is highly desirable because it allows standardization and optimization of the plan, structure and overall construction. However, due to the background as described above, there is a big barrier and it has not been implemented. This is especially true when the connecting structure used in the conventional prefabrication method does not meet the load-bearing requirements imposed in the nuclear field or keeps the tolerances of the parts to be addressed in the field and at the same time in the field. This is because it does not satisfy the alignment accuracy at the time of assembly that enables flexible connection.

  In view of the fact that each nuclear power plant has been newly designed with an almost identical building with the same function, studies are being conducted on how to reduce design and construction costs.

  The cost can be reduced by a system that can flexibly design a desired space and indoor arrangement by using a plurality of modules manufactured in advance. For this purpose, there are problems in introducing the prefabrication method, that is, problems related to the crimping connection of individual structural materials, and problems associated with the problems such as insufficient tolerances and dimensional accuracy and insufficient alignment accuracy during assembly. It is necessary to overcome

  In the prior application (Patent Document 1) of AREVA NP GmbH, a wall material of the type described above is disclosed. This wall material is assembled and connected with other similar wall materials by a simple construction method to construct a building, especially in addition to resistance to normal operating loads, such as flood, earthquake, long rain, freezing, Buildings or composites that are resistant to unusual or extreme loads such as strong winds, typhoons, extreme ambient temperatures, direct bombardment, and aircraft crashes, whether they are individual loads or combined loads Make it possible to build a building.

  According to this prior art, a wall material provided with a wall body (named as a wall module in Patent Document 1) formed as a precast concrete material for constructing a building is a regular reinforcing bar as a whole. It has many rebars that form a lattice. Preferably, each of the reinforcing bars extends parallel to the edge of the wall and is embedded in the wall. At least a part of the reinforcing bar includes a connecting element that penetrates the wall body from edge to edge, and is fixed to a complementary connecting element of a wall member connected next to the end of the penetrated reinforcing bar. . Each of the connecting elements is connected to the associated reinforcing bar with play, i.e. movable, in a released state, at least not fixed to the complementary connecting element. For example, the connecting element can be displaced by at least 2 mm from a predetermined center position in all directions on a plane perpendicular to the longitudinal direction of the reinforcing bar.

  Furthermore, Patent Document 1 describes, as a preferred example, a wall material provided with a sandwich-structured wall body having an outer shell and an inner shell and a core filling portion between the outer shell and the inner shell. . In this wall material, the outer shell and the inner shell are fixed to each other so as to withstand shearing and pulling by a plurality of reinforcing bar elements. However, Patent Document 1 does not specifically describe the basic concept of this sandwich structure with respect to the embodiment.

International Publication No. 2012/123067 (WO2012 / 123067A1)

  An object of the present invention is to further develop the wall material disclosed in the above-mentioned prior application. A solid modular reinforced concrete structural material including a reinforced concrete plate and a connecting element (joint) is manufactured in advance. The individual structural materials are connected to form an integrated unit that can withstand the high load levels under the loads of the cases described above. In this proposal, there is a need to create a reinforced structure that can be constructed at an acceptable cost and that is designed to meet the above-mentioned requirements and that allows reinforced concrete plates and joint connections. Also, joints that are exposed when such wall materials are arranged and are embedded with cast-in-place concrete or other fillers, such as mortar, are used to reduce cast-in-place concrete and formwork materials at the construction site. In addition, it is desirable to make the volume as small as possible.

This problem is solved by the invention having the features of claim 1.
A wall material according to the present invention has a sandwich structure having an inner shell, an outer shell, and a core filling portion between the inner shell and the outer shell, and has a rectangular surface and four side edges. A wall material for building a building, manufactured as a precast concrete structure with a body,
The inner shell is a reinforced concrete structure having main reinforcing bars arranged in a lattice pattern, and the main reinforcing bars include a horizontal reinforcing bar arranged in parallel to the edge and a vertical reinforcing bar arranged in parallel to the edge. These rebars penetrate the inner shell from edge to edge,
The longitudinal reinforcing bars are provided with connecting elements at their ends, which are formed so that they can be connected by screws or clamps to complementary connecting elements of another wall material arranged above or below the wall material. And
A U-shaped fixing bar having a leg end portion and a curved end portion bent at right angles to each other causes the bent portion of the U-shaped fixing bar to be locked to the longitudinal reinforcing bar, and the leg end portion of the inner shell is fixed to the inner shell. Embedded in and embedded, the curved end protruding into the core filling portion,
The outer shell has the same structure as the inner shell.
Preferred embodiments are specified in other claims.
The U-shaped fixing bar protruding to the core filling portion is provided on at least a part of the lattice of the main reinforcing bar.
The curved end of the U-shaped anchoring muscle of the inner shell and the curved end of the U-shaped anchoring of the outer shell make a pair, each pair surrounding an O-shaped opening, At least one transverse reinforcing bar as a reinforcing bar element of the core filling portion passes through the opening.
A distribution bar extending in parallel with the main reinforcing bar is provided.
The leg end portion of the U-shaped fixing bar is located between the main reinforcing bar and the distribution reinforcing bar.
In order to connect a plurality of the wall members adjacent in the lateral direction, U-shaped connecting bars are implanted in the inner shell and the outer shell and project laterally from the wall body.
In the connecting body in which a plurality of the wall members are arranged side by side, the U-shaped connecting bars of the wall members adjacent to each other overlap each other inside the longitudinal butt joint portion, and the U of the inner shell overlaps with each other. A pair of letter-shaped connecting bars is surrounded by beam bars together with the pair of U-shaped connecting bars of the outer shell. In this connection body, at least one longitudinal reinforcing bar is arranged in the longitudinal butt joint portion.
The connecting body formed of the wall material is characterized in that the wall materials stacked one above the other are screwed or fixed to each other by the connecting element. In this connection body, at least concrete or mortar is poured into the horizontal connection portion and the vertical butt joint portion between the wall materials.

  Further aspects and specific examples of this basic concept will become apparent from the dependent claims and the following detailed description of the embodiments.

The following attached drawings show simplified and schematic views.
The perspective view which shows the prefabricated construction wall material of the sandwich structure provided with the inner shell, the outer shell, and the core filling part. The perspective view which shows the reinforcing bar structure of the inner shell in the wall material in the middle of manufacture. Sectional drawing of the wall material seen from the top. FIG. 4 is a partial view of FIG. 3. The perspective view which shows the reinforcing bar structure of the inner shell of the wall material before placing the concrete material which embeds a reinforcing bar. The perspective view which shows the inner shell of the wall material after placing concrete material. The perspective view which shows fixation of the inner shell and outer shell in a wall material. It is a perspective view which shows fixation of the inner shell and outer shell in wall material, and concrete material of outer shell is not illustrated in this figure (namely, it is illustrated transparently). The top view which shows fixation of the inner shell and outer shell in a wall material. The perspective view which shows the procedure at the time of connecting two wall materials arranged side by side in order from the top to the bottom. The perspective view of the subsequent step at the time of connecting the two wall materials arranged side by side, ie, the step of setting in the butt joint part of the vertical direction between both wall materials. The side view of the reinforcing bar shown in FIG. The perspective view which shows the detail of the joint reinforcement in the butt joint part of the vertical direction between the two wall materials arranged horizontally. Sectional drawing which shows the connection part of the two wall materials piled up and down. The longitudinal cross-sectional view of the connection part of the two wall materials piled up and down.

  In the description of the present specification, all the descriptions regarding the position and direction such as “upper”, “lower”, “vertical”, “horizontal” and the like are assumed to be in the wall material in the normal assembly posture shown in the drawing.

  FIG. 1 is a perspective view showing a rectangular wall material 2 having a sandwich structure for use in, for example, a nuclear power plant building for a prefabricated construction method. The wall material 2 that is used to be arranged as a side wall of a building and normally forms a floor height of one floor includes an inner shell 4 manufactured as a reinforced concrete structure, an outer shell 6 that faces the inner shell 4, and these A core filling portion 8 made of, for example, heavy concrete, between the inner shell 4 and the outer shell 6. As will be described later, the inner shell 4 and the outer shell 6 are substantially mirror-symmetric with each other, and are otherwise configured in the same format. Both upper edges are provided with a large number of connecting elements 10 for fixing bolts to a wall material (not shown here) installed above and projecting from the inner shell 4 and the outer shell 6. In the lower part of the wall material 2 (not visible here), a number of connecting elements are arranged which functionally complement the connecting element 10 in a corresponding manner. Below each surface 12 of the inner shell 4 and the outer shell 6, there are a plurality of access openings 14 for bolting when assembling the unit with wall materials. Each of these access openings 14 penetrates the inner shell 4 and the outer shell 6 in a channel shape. A plurality of reinforcing bar loops / U-shaped connecting bars having curved ends (U-shaped connecting bars and U-shaped connecting bars) are provided on the side edges of both sides in order to connect with wall materials installed side by side (not visible here). (Omitted) 16 is planted and protrudes from the inner shell 4 and the outer shell 6 of the wall material 2.

  FIG. 2 illustrates the structure of the inner shell 4 of the wall material 2, which is the first stage in which the internal rebar cage is constructed before placing concrete. The wall material shown in the finished state on the right side of the figure and the joint part shown in the partially placed concrete are ignored here (the whole structure is shown for the reason of drawing using a CAD program). From which individual layers have been removed). The outer shell 6 is configured similarly to the inner shell 4 as described above.

  The main rebar 18 that is connected to the wall material 2 to receive a tensile force and transmit it to the other is also called a bending rebar, and a plurality of transverse rebars 20 (only the bottom two are shown in FIG. 2). ) And a plurality of longitudinal reinforcing bars 22, which form a rectangular grid in the wall surface of the wall material 2. The horizontal reinforcing bar 20 and the vertical reinforcing bar 22 are in contact with each other at each intersection, and are bound by, for example, a wire at the intersection and fixed to each other. A plurality of reinforcing bars 20 in the horizontal (horizontal) direction, that is, parallel to the upper edge and the lower edge of the wall material 2 are arranged at equal intervals, and in the vertical (vertical) direction, that is, on the wall material 2 side. The same applies to the plurality of reinforcing bars 22 parallel to the edge. The diameter of each reinforcing bar in the vertical and horizontal directions is preferably 30 to 35 mm. The distance between the reinforcing bars 20 and 22 in the longitudinal direction is preferably 200 mm (square lattice).

  Screws for bolts are formed at the upper ends of the longitudinal reinforcing bars 22 that are sequentially arranged in the lateral direction, and the two longitudinal reinforcing bars 22 are paired together and screwed to the receiving portion of the attached connecting member 24. Alternatively, it is welded in the receiving part as an alternative. A threaded connecting bolt 26 is screwed to the center of the receiving portion of the connecting member 24 between the pair of longitudinal reinforcing bars 22 and protrudes upward from the connected portion. A holding plate 28 having a central hole can be inserted from above the longitudinal connecting bolt 26 and tightened with a nut 30 from above. At the lower end of the rebar pair (22) connected to each other, a steel box (Box) 32 having a rectangular cross section, which is formed by welding four steel plates to each other or integrally casting, is provided. . The box 32 is disposed so as to be fitted between the two longitudinal reinforcing bars 22, and the outside of the box 32 is welded to the reinforcing bars 22 or screwed. The positions of the connecting member 24 and the box 32 are selected so that the connecting member 24 and the box 32 are embedded flush with the upper edge and the lower edge of the inner shell 24 when concrete is placed later. Therefore, only the upper part of the connecting bolt 26 protrudes upward. The boxes 32 are embedded in the concrete so that a substantially rectangular assembly space is left inside and directly above each box 32 rectangle. Each space formed in this way can be accessed from below via the open lower opening of the box 32 and from the surface 12 via the open access opening 14. Yes (see FIG. 1).

  Thus, when the system of the connection element 10 is formed as a whole, the plurality of wall members 2 stacked one above the other can be fastened to each other when the building is assembled later. At the time of assembling, the upper wall member 2 is engaged with each upper portion of the plurality of connecting bolts 26 of the lower wall member 2 so that its corresponding box 32 that is the counterpart of the bolt is engaged with the lower wall member 2. It is arranged on the wall material 2. Next, a plurality of holding plates 28 to be locked to the upper edge of the box 32 from the side through the plurality of access openings 14 on the surface 12 of the inner shell 4 (the same applies to the outer shell 6) Then, the nut 30 is screwed and tightened to secure it. At this time, the holding plate 28 serves as a so-called washer. The cross section of the box 32 is selected such that when the connecting bolt 26 is incorporated, the bolt 26 has a play of 2-3 mm in all directions inside the box 32. In this way, possible dimensional errors can be adjusted at the time of assembly at a later date. This method corresponds to the design philosophy described in International Publication No. 2012/123067 (WO2012 / 123067A1) of AREVA NP GmbH. In FIG. 1 and FIG. 2, for the sake of clarity, a holding plate 28 and a nut 30 are shown above the connection bolt 26 that is the final position of assembly. After arranging and connecting the coupling partners in combination, they are incorporated into the corresponding locations and tightened.

  The configuration of the inner shell 4 shown in FIG. 2 will be further described. In addition to the main rebar 18, there is provided a power distribution rebar 34 composed of a plurality of rebars 36 and rebars 38 that are similarly crossed and arranged in a grid pattern. These rebars 36 and 38 preferably have a diameter of 100 mm and the same lattice dimensions as the main lattice (a square lattice with a rebar spacing of preferably 200 mm). The grid of the distribution reinforcing bars 34 formed by the lateral reinforcing bars 36 and the vertical reinforcing bars 38 is arranged in parallel with the grid of the main reinforcing bars 18, that is, the surface 12 of the inner shell 4 (here on the back side). Are arranged at predetermined intervals in this direction. An example is also possible in which the intersections of the two reinforcing bar lattices are shifted from each other by half of the lattice dimension in the vertical and horizontal directions. That is, in this example, the intersection of the grids of the distribution reinforcing bars 34 is at the center of the grid of the main reinforcement 18 and the intersection of the grids of the main reinforcement 18 is at the center of the grid of the distribution reinforcing bars 34 (see FIG. 12).

  At the side edges on both sides of the inner shell 4, as described above, the steel U-shaped connecting bars 16 projecting outward, that is, (reinforcing bar) loops, are butt joint portions of wall materials on the side in a later step. Is provided to form and fix the. Each of the U-shaped connecting bars 16 has two legs 40 which are formed sideways and are formed later so as to be parallel to the longitudinal direction of the wall material 2. These leg portions 40 are disposed in a space between the main reinforcing bar 18 and the distribution reinforcing bar 34, and preferably contact with the vertical reinforcing bar 22 of the main reinforcing bar 18 on the side where the horizontal reinforcing bar 20 is also disposed. (Bundled by a wire at the contact point with the longitudinal reinforcing bar 22). In this example, one of the leg portions 40 of each U-shaped connecting bar 16 is positioned above the corresponding horizontal reinforcing bar 20 of the main reinforcing bar 18 and the other is positioned below. In other words, each horizontal reinforcing bar 20 of the main reinforcing bar 18 is located between the two leg portions 40 of the U-shaped connecting bar 16 arranged on the same plane (see also FIG. 12). The part of the leg 40 existing inside the inner shell 4 is formed to be relatively long, and in this example, it extends over four or more of the lattice of the main reinforcing bars 18, that is, over 800 to 1,000 mm or more. It extends. The portions of the legs 40 protruding outwards preferably each have a lateral length of 400 mm, including the curved portion 42 at the end. The assembly and connection of the butt joint extending in the longitudinal direction between the two wall members 2 performed later will be described later.

  The rebar of the inner shell 4 also includes a plurality of U-shaped (or loop) fixing bars 44 made of steel bent at right angles (eg, bent or cast into this shape). The two leg end portions 46 of the bar 44 are respectively located in the gaps between the main reinforcing bar 18 and the distribution bar 34. The leg end portions 46 that are relatively short and extend below the size of one grid are arranged in parallel with the transverse reinforcing bars 20 of the main reinforcing bars 18. The curved end portion 48 of the U-shaped fixing bar 44 protrudes vertically from the back surface 50 opposite to the front surface 12, and at least 200 mm protrudes into the core filling portion 8 provided later. In this example, the bent portion 52 of each U-shaped fixing bar 44 is locked (locked from behind) and fixed to one of the longitudinal bars 22 of the main reinforcing bar 18. This structure is illustrated in FIGS. 3 and 4 show corresponding longitudinal sections of the wall material 2 to be completed later. In this way, isomorphic U-shaped bars 44 are arranged on at least part of the grid of the main rebar 18, preferably on most grids, and advantageously on all grids. FIG. 5 shows the final reinforcing bar structure of the inner shell 4 immediately before the concrete is placed. FIG. 6 shows a state after placing concrete.

  As can be seen from FIG. 6, when the outer shell 6 having a structure corresponding to the inner shell 4 is also formed, the inner shell 4 and the outer shell 6 are formed by using both U-shaped fixing bars 44 protruding to the core filling portion 8 provided later. The wall material 2 is manufactured by being fixed to each other. Each of the inner shell 4 and the outer shell 6 extends in parallel with each curved end portion 48 of the U-shaped fixing bar 44 of the inner shell 4 and the U-shaped fixing bar 44 of the outer shell 6, and has straight leg portions. Are arranged at appropriate relative positions so that they overlap each other. As a result, a substantially O-shaped opening 54 surrounded by the curved end portions 48 of both U-shaped fixing bars 44 is formed. This opening 54 appears in FIG. 7 or FIG. In FIG. 8, the concrete of the outer shell 6 is erased on the drawing for easy viewing. It can also be seen that a plurality of U-shaped fixing bars 44 are arranged in a row, and one row of O-shaped openings 54 (that is, loops) are arranged in a row in the lateral direction. When viewed in the vertical direction, a large number of these opening rows overlap and distribute evenly over the entire height of the wall material 2 (only two rows are shown here for simplicity). Two reinforcing bars 56 extending over the entire width of the wall material 2 are inserted into each of the opening rows, and these reinforcing bars 56 extend in the lateral direction in accordance with the fixed bar array. One of the two reinforcing bars 56 is arranged closer to the inner shell 4 in the space surrounded by the O-shaped opening 54 by the fixed reinforcing bar arrangement, and the other is arranged closer to the outer shell 6. In the case of this example, these reinforcing bars 56 are in contact with the apex of the curved dark portion 48 of the U-shaped fixing bar 44 from the inside.

  After all the reinforcing bars 56 are arranged in the space between the inner shell 4 and the outer shell 6, concrete is driven into the core filling portion 8. The core filling portion 8 is made of heavy concrete, and the above-mentioned requirements are taken into consideration regarding the shielding action against radiation. The filling of heavy concrete is also to withstand various loads (pressure load after element connection). In order to obtain a high-quality connection, it is preferred that the concrete surface that is placed to ensure the connection has a surface free of granular structures. Concrete is a mineral architectural civil engineering material and can be considered as an artificial rock. As concrete aggregate composed of a mixture of cement, aggregate and water, sand, gravel and crushed stone are mainly used. Concrete is poured into the mold just before assembly. Natural materials such as gravel taken from sediment or crushed rock (sand gravel, crushed stone) are often used as standard concrete aggregates. This aggregate substantially determines the workability and strength of the concrete. By appropriately sizing the different particle sizes of the aggregate, it is possible to obtain as high a density of particles as possible with few cavities in which cement paste is present. Due to the high density solidification, it is possible to bear the load in the concrete via the granular structure.

  When the core filling portion 8 is cured, the combined materials of the outer shell 6, the core filling portion 8, and the inner shell 4 shown in FIG. 1 function as one integrated object. Preferably, the inner shell 4 and the outer shell 6 each have a wall thickness S of at least 240 mm. The thickness T of the core filling portion 8 can be adjusted, for example, between 200 mm and 550 mm. Therefore, the total thickness D of the wall material 2 can be in the range of 700 mm to 1,000 mm or a larger value, for example. About thickness, it has shown in the top view of the wall material 2 in FIG. Here, the core filling part 8 has not been completed yet.

  FIG. 10 shows the on-site process in order from top to bottom, in which two wall members 2 are connected side by side and connected and joined together. First, the U-shaped connecting bars 16 on the side edges of the inner shell 4 and the U-shaped connecting bars 16 on the side edges of the outer shell 6 are paired and overlap each other in a predetermined position. Install. At this time, the curved portion of each connecting bar 16 is brought into contact with the end face of the shell of the adjacent counterpart wall material 2. In other words, a plurality of connecting portions protruding from the concrete penetrate through the butt joint portion 58 extending in the vertical direction between the adjacent wall members 2 over the entire width thereof.

  Next, a plurality of steel beam bars (or bars) 60 to be sealed are bridged over a pair of U-shaped connecting bars 16. These beam bars 60 each form a closed rectangular frame in the final stage of assembly, and the long rectangular bars 64 of the rectangle are laterally perpendicular to the lattice plane of the main reinforcing bars 18 (and therefore The short side stripes 66 are oriented in the vertical direction. The rectangular frame is engaged with a pair of connecting bars at the same height in the inner shell 4 and the outer shell 6 of two wall members 2 arranged side by side, or surrounds the connecting bar pair from the outside. Connected to connecting bars. In this example, a plurality of, in the illustrated case, four beam bars 60, preferably arranged at equal intervals and parallel to each other, are attached to one connecting bar pair (see FIG. 13).

  When the butt joint 58 in the vertical direction is viewed from above, it is divided into a plurality of smaller rectangular spaces by the U-shaped connecting bars 16 and the beam bars 60, and these spaces are arranged in a straight line in the height direction of the wall material 2. Yes. That is, a plurality of longitudinal partial channels are defined in the internal reinforcing bar structure of the butt joint portion 58. In the next step, a plurality of longitudinal reinforcing bars 62, three in this example, are inserted inside the partial channel.

  Fine particles of the same quality as the concrete, preferably the concrete of the inner shell 4 and the outer shell 6 of the wall material 2, in the longitudinal butt joint 58 having the above arrangement and preferably not exceeding 400 mm in width. Concrete is poured (concrete performance C50 / 60 or higher). A state in the middle of the placing process is schematically shown in FIG.

  The tensile force at the connecting portion in the horizontal direction between the two wall members 2 arranged in the vertical direction is transmitted by screwing the vertical main reinforcing bars 18 as described above.

  The lateral connecting portion 68 (lateral joint portion) between the two wall members 2 that are stacked one above the other with a flat spacer 70 is preferably 50 mm in height, and after both wall members 2 are installed. Then high quality grout mortar is injected. Mortar is also injected into the plurality of openings 14 for screwing the connecting element 10 in the final state.

  By connecting all the wall materials 2 so as not to be displaced from each other by the above-described method, a structure strong against shearing is formed as a whole. This wall has the advantageous properties of an integral panel / plate member. The transmission of force between the individual structural materials is ensured by a unique connection and fastening system (connections resistant to tension and shear).

  Obviously, there can be numerous wall material variations that allow, for example, ceiling connections, T-shaped butts between outer and inner walls, corner connections, and the like.

  In addition to using the above-mentioned wall material and connection structure in a nuclear power plant building, it is naturally possible to apply to other buildings (for example, military buildings, industrial plant buildings) having similar high demands.

2 Wall material 4 Inner shell 6 Outer shell 8 Core filling part 10 Connecting element 12 Surface (inner shell, outer shell)
14 Access opening 16 Reinforcing bar loop / U-shaped connecting bar (U-shaped connecting bar for side connection)
18 Main reinforcement 20 Lateral reinforcement (main reinforcement)
22 Longitudinal rebar (main rebar)
24 Connecting member 26 Connecting bolt 28 Holding plate 30 Nut 32 Box 34 Power distribution rebar 36 Lateral rebar (power distribution rebar)
38 Longitudinal rebar (distribution rebar)
40 Leg part 42 Bending part 44 U-shaped fixed muscle (U-shaped fixed muscle for shell fixation)
46 Leg end 48 Curved end 50 Back side (inner shell, outer shell)
52 Bending part 54 O-shaped opening 56 Reinforcing bar (of core filling part)
58 Longitudinal butt joint 60 Beam reinforcement 62 Longitudinal rebar (of butt joint)
64 Long side streaks 66 Short side streaks 68 Lateral connection (transverse joint)
70 spacer

Claims (10)

It has a sandwich structure having an inner shell (4), an outer shell (6), and a core filling portion (8) between the inner shell (4) and the outer shell (6), and has a rectangular surface and four sides. A wall material (2) for building a building, manufactured as a precast concrete structural material with a wall having an edge of
The inner shell (4) is a reinforced concrete structure having a latticed arrangement of main reinforcing bars (18), wherein the main reinforcing bars (18) are arranged in parallel to the edges and the transverse reinforcing bars (20) and the edges. Longitudinal bars (22) arranged parallel to the part, these reinforcing bars (20, 22) penetrate the inner shell (4) from edge to edge,
The longitudinal reinforcing bars (22) are provided with connecting elements (10) at their ends, which are connected to the other wall material (2) arranged above or below the wall material (2). It is formed to be connectable with a complementary connecting element (10) with a screw or a clamp,
A U-shaped fixing bar (44) having a leg end part (46) and a curved end part (48) bent at right angles to each other has a bent portion (52) of the U-shaped fixing bar (44) in the longitudinal direction. The leg end (46) is embedded in the inner shell (4) while being engaged with a reinforcing bar (22), and the curved end (48) is placed in the core filling portion (8). Stick out,
A wall material in which the outer shell (6) has the same structure as the inner shell (4). The wall material according to claim 1, wherein the U-shaped fixing bar (44) protruding from the core filling part (8) is provided on at least a part of the lattice of the main reinforcing bar (18).   The curved end (48) of the U-shaped fixing bar (44) of the inner shell (4) and the curved end (48) of the U-shaped fixing bar (44) of the outer shell (6) are paired. And each pair surrounds an O-shaped opening (54), and at least one transverse reinforcing bar (56) as a reinforcing bar element of the core filling portion (8) passes through the opening (54). The wall material according to claim 1 or 2, wherein   The wall material according to any one of claims 1 to 3, wherein a distribution reinforcing bar (34) extending in parallel with the main reinforcing bar (18) is provided.   The wall material according to claim 4, wherein the leg end portion (46) of the U-shaped fixing bar (44) is located between the main reinforcing bar (18) and the distribution reinforcing bar (34).   A U-shaped connecting bar (16) is implanted in the inner shell (4) and the outer shell (6) in order to connect a plurality of the wall materials (2) adjacent in the lateral direction. The wall material according to any one of claims 1 to 5, which protrudes laterally from the wall. A connecting body in which a plurality of the wall materials (2) according to claim 6 are arranged side by side,
The U-shaped connecting bars (16) of the wall members (2) adjacent to each other overlap each other inside the longitudinal butt joint (58), and the U-shaped connection of the inner shell (4) A coupling body, in which a pair of bars (16) is surrounded by beam bars (60) together with a pair of U-shaped connecting bars (16) of the outer shell (6).   The connecting body according to claim 7, wherein at least one longitudinal reinforcing bar (62) is arranged in the longitudinal butt joint (58). A connecting body formed by the wall material (2) according to any one of claims 1 to 6,
A connecting body in which the wall members (2) stacked one above the other are screwed or fixed to each other by the connecting element (10).   The connection body according to claim 9, wherein at least concrete or mortar is injected into the lateral connection portion (68) and the longitudinal butt joint portion (58) between the wall materials (2).

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