JPH10299135A - Precast wall panel and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformalize connecting strength by arranging a recessed space to be filled with concrete on the inside of a precast wall panel in order to connect adjacent precast wall panels to each other, and projecting a U-shaped half-ringed reinforcement from an end part through the recessed space. SOLUTION: In an end part 3 of a precast wall panel P, a recessed space 4 to be filled with concrete is formed on the inside surface side, and a U-shaped half-ringed reinforcement 5 is projected in this recessed space 4 from the inside of the wall panel P. A surface containing two arm parts 51 and 52 of this U-shaped reinforcement 5 is made parallel to inside and outside surfaces 2 and 1 of the precast wall panel P, and the recessed space 4 is formed in a plurality in the vertical direction, and a a part between the recessed spaces 4 is formed as an inclined face 10 of about 45 degrees. Next, mutual end parts 3 of the panel P are arranged in a butting condition, and concrete is filled between the adjacent recessed spaces 4, and both side U-shaped reinforcements 5 are buried in a locking bar shape in the filled concrete. Therefore, the adjacent panels can be firmly connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast wall panel in which a building wall is composed of precast wall panels.
The present invention relates to a method for connecting precast wall panels, a structure for connecting precast wall panels, a molding device for precast wall panels, a method for manufacturing precast wall panels, and a corner structure for precast wall panels.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional connection structure between precast wall panels and is shown in a horizontal sectional view. At the ends of the precast wall panels p1 and p2, recesses a and b are formed on the inner wall surface side, and reinforcing bars c and d protrude from the ends of the precast wall panels into the recesses a and b.

[0003] Then, by reinforcing each of the reinforcing bars c and d with another reinforcing bar e and welding, the reinforcing bars c and d are joined together, and the recesses a and b are filled with concrete f to connect the reinforcing bars c and d. Completed.

FIG. 9 is a horizontal sectional view of a corner portion of a precast wall panel building. Also in this case, a reinforcing bar g protruding from an end of the corner precast wall panel cp.
And a reinforcing bar c protruding from the adjacent precast wall panel p1
Then, another reinforcing bar e is attached and welded, and the concavities a and h are filled with concrete f to complete the connection.

[0005]

As described above, the conventional connection structure of the precast wall panels has a structure in which the reinforcing bars c and d projecting from both sides are connected by welding, so that there is a difference in the skill of the welding operator. Therefore, there is a problem that the strength of the connecting portion varies.

[0006] In addition, since a special operation such as welding is required, it is necessary to arrange a welding operator, and there is a problem that the construction period is prolonged.

[0007] In the case of an earthquake, a typhoon, or the like, a large or complicated force acts on the corner in the event of an earthquake or a typhoon. However, as shown in FIG. 9, if the adjacent precast wall panels are connected by welding at the corners, the corners may be damaged by a complicated and large force when they are applied. Further, since the connecting structure of the corner portion is different from that between the adjacent panels in FIG.

[0008] The technical problem of the present invention is to pay attention to such a problem, and it is possible to connect adjacent precast wall panels with uniform strength without requiring welding, and there is a possibility that strength is reduced at corners. An object of the present invention is to realize a precast wall panel building having no structure and capable of standardizing the structure.

[0009]

The technical problem of the present invention is solved by the following means. In order to connect adjacent precast wall panels, a concave space for filling concrete is provided inside the end of the precast wall panel, and a U-shape fixed in the precast wall panel. Is a precast wall panel formed by projecting the semi-annular reinforcing bar from the end through the concave space.

As described above, the semi-annular reinforcing bar protrudes from the end portion through the concave space for filling concrete,
When the precast wall panels are abutted against each other, the adjacent semi-annular reinforcing bars overlap with each other. When the concrete is filled and hardened, the concrete serves as a canker, and the adjacent precast wall panels are firmly connected to each other. In addition, there is no variation in the connection strength due to the skill level unlike welding, and a uniform and highly reliable strength can be obtained.

A second aspect of the present invention relates to a method of connecting the precast wall panels to each other. First, a concave space for filling concrete is provided inside an end of the precast wall panel, and is fixed in the precast wall panel. A semi-circular reinforcing bar such as a U-shape makes adjacent the precast wall panels projecting from the end through the concave space.

At this time, in a state where the ends of the adjacent precast wall panels are arranged in an abutting manner, concrete is filled over both of the concave spaces, so that the two project from the precast wall panels on both sides. Each semi-annular reinforcing bar is embedded in the filled concrete so as to overlap with each other, and the concrete is hardened.

As described above, the adjacent precast wall panels are arranged in abutting manner and only concrete is filled over both concave spaces, so that it is not necessary to arrange a welder. The construction period is not lengthened, and the finished strength is strong and uniform.

According to a third aspect of the present invention, there is provided a connecting structure for a precast wall panel, wherein a concave space for filling concrete is provided inside an end portion of the precast wall panel, and a U-shape fixed in the precast wall panel. The semi-annular reinforcing bars of the precast wall panels projecting from the ends through the concave space are adjacent to each other, and the ends of the adjacent precast wall panels are arranged in abutting manner, and both Concrete is filled over the concave space, and the respective semi-annular reinforcing bars protruding from the precast wall panels on both sides are embedded in the filled concrete so as to overlap each other.

[0015] As described above, since the semi-annular reinforcing bars projecting from the precast wall panels on both sides are embedded in the filled concrete in a state of overlapping each other, the concrete in both semi-annular portions becomes a cannula-like shape, and both of the precast wall panels are formed. Since the wall panels are firmly connected, the strength does not become uneven due to the skill level as in the case of welding.

[0016] Claim 4 has a concave space for concrete filling inside the end of the precast wall panel,
A device for molding a precast wall panel in which a semi-circular reinforcing bar having a U-shape or the like fixed in a precast wall panel projects from an end portion through the concave space, wherein a convex for forming the concave space is provided. And two parallel arms for receiving two arm portions of the semi-annular reinforcing bar under the convex portion.
The book slit is formed to reach the lower end.

As described above, two parallel slits are formed below the convex portion for forming the concave space at the end of the precast wall panel so as to reach the lower end, so that the semi-annular slit is formed. With the reinforcing bars arranged, the molding device of the present invention can be formed simply by covering the two arms of the semi-annular reinforcing bar from above. Further, after the concrete is cast and cast, when the molding apparatus of the present invention is pulled up, the semi-circular reinforcing bar remains integrally with the precast wall panel, so that molding and release are easy.

Claim 5 is a method of manufacturing a precast wall panel, wherein the inside of the end of the precast wall panel is:
Having a concave space for concrete filling, semi-annular reinforcing bars such as U-shaped fixed in precast wall panels,
In order to mold a precast wall panel projecting from an end portion through the concave space, a convex portion corresponding to the concave space is formed, and two slits parallel to each other are formed below the convex portion. Use a molding device that is formed to reach

Then, concrete is poured into the two slits by inserting the two arms of the semicircular reinforcing bar into the slits and filling the lower slits with the padding. After curing, the mold is moved upward to release the mold.

As described above, by putting the forming device over the semi-circular reinforcing bar on which the reinforcement has been arranged, or by inserting two arm portions from the side into the two slits of the installed forming device. After inserting the two arms of the semi-circular reinforcing bar into the slits and filling the lower slits with the filler, concrete is poured into the slits and hardened. Since it only needs to move the device to the upper side to release the mold, a precast wall panel with a complicated shape reinforcing bar consisting of two arms and a semi-circular reinforcing bar protruding from the end can be easily mass-produced by a simple operation. .

According to a sixth aspect of the present invention, a corner portion of a wall portion of the building has a precast wall panel structure, and a concave space for filling concrete is provided inside the end portion thereof, and the U-shaped portion is fixed in the corner panel. A semi-annular reinforcing bar having a convex shape or the like protrudes from the end through the concave space, and a precast wall panel having the same concave space and semi-annular reinforcing bar as described above is adjacent to an end of the corner panel.

The ends of the adjacent precast panels are arranged in abutting manner, and concrete is filled over both of the concave spaces.
The semi-annular reinforcing bars projecting from the precast panels on both sides are embedded in the filled concrete in a state of overlapping each other.

As described above, since the corner portion of the precast wall panel has the precast wall panel structure, unlike the conventional structure in which the corner portion is joined, there is no joint portion in the corner portion. Thus, it is possible to ensure the strength of the corner portion where the strength is not complicated and the complicated and large force acts. In addition, since the end of the corner panel has the same structure as the end of the precast wall panel, it can be molded using the same molding device, and the cost can be reduced by standardization.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a precast wall panel according to the present invention. FIG. 1 is a perspective view showing an embodiment of a precast wall panel, where P is a precast wall panel, 1 is its outer surface, 2 is its inner surface, and 3 is an end.

At the end 3 of the precast wall panel P, a concave space 4 for filling concrete is formed on the inner surface 2 side thereof, and a U-shaped or other semi-annular reinforcing bar 5 is formed in the space 4. , From the interior of the precast wall panel P. Two arms 5 of this U-shaped reinforcing bar 5
The plane including 1, 52 is parallel to the inner and outer surfaces 2, 1 of the precast wall panel P.

Using the precast wall panel of FIG.
A technique as shown in FIG. 2 is used to connect the two precast wall panels. In FIG. 2, (1) is a horizontal sectional view of the connecting portion, (2) is a front view of the connecting portion, (3) is a perspective view showing an overlapping state of the U-shaped reinforcing bars, and (4) is concrete at the connecting portion. It is a horizontal sectional view in the state where it was filled.

The U-shaped reinforcing bar 5 has two arms 5
1 and 52 are parallel to the inner and outer surfaces 2 and 1 of the precast wall panel P. (1) When viewed from above as shown in FIG. However, when viewed from the front as shown in FIG. 2B, the U-shaped rebars 5a and 5b appear to be U-shaped, and the two arm portions 51 and 52 appear to be parallel. Since the U-shaped reinforcing bars 5a, 5b of the adjacent precast wall panels P1, P2 protrude from the ends, they overlap each other as shown in the drawing, in the concave spaces 4b, 4a on the other side.

As described above, with the end portions 3, 3 of the adjacent precast wall panels P1, P2 arranged in abutting relationship, the adjacent concave spaces 4a,
4b, the concrete is filled, and the U-shaped reinforcing bars 5a, 5b on both sides are filled with concrete 6 as shown in FIG.
Embed inside. When the filled concrete 6 hardens, the connection is completed.

In a state where the filled concrete 6 is hardened,
Since the filled concrete 6 is in the cannula shape in the semi-annular portions of both U-shaped reinforcing bars 5a and 5b, even if a tensile force is generated, it can sufficiently withstand the strength.
Also, unlike the case of welding, the connection strength does not vary depending on the skill level, and a highly reliable connection structure can be obtained.

In the precast wall panel shown in FIGS. 1 and 2, a plurality of concave spaces 4 are formed inside the end portion 3 at intervals in the vertical direction, and the space between the concave spaces 4 is about 45 degrees. Inclined surface 10. Also, the tip surface 11
It is almost perpendicular to the panel surface.

FIG. 3 is a horizontal sectional view showing an embodiment of a corner portion of a precast wall panel building. Cp is a corner panel, which has a structure in which the horizontal streaks 7 are bent at a right angle, the vertical streaks 8 are crossed and arranged, and embedded in the precast concrete 9.

Then, the adjacent precast wall panel P
1 and 2, a concave space 4b is formed on the inner surface 2 side thereof as in the case of the precast wall panels P, P1 and P2 in FIGS.
Space 4 of the adjacent precast wall panel P1 through
The U-shaped reinforcing bar 5b projects from the inside of the corner panel Cp so as to reach the inside of the corner panel Cp.

The connection between the corner panel Cp and the precast wall panels P1 and P2 is exactly the same as the connection between the precast wall panels P1 and P2 shown in FIG. 2, that is, both ends 3 and both sides of the corner panel Cp. The ends 3 of P1 and P2 are arranged in abutting manner, and the U-shaped reinforcing bars 5a and 5b are connected to the concave spaces 4b and 4
a.

In this state, adjacent concave spaces 4a,
4b is filled with concrete and U-shaped reinforcing bars 5 on both sides
a, 5b are embedded in the filled concrete 6, and the filled concrete 6 is hardened. This corner panel Cp
Since there is no connecting portion at the corner, not only the construction is simple, but also the structure is robust. 1 and 2
Since the structures of the connecting portions of the precast wall panels are exactly the same, the structure of all the connecting portions can be standardized and the cost can be reduced.

FIG. 4 is a perspective view showing a molding apparatus for forming an end portion of the precast wall panel or the corner panel shown in FIGS. Reference numeral 12 denotes a vertical wall for forming the distal end surface 11, and the two arms 51, 5 of the U-shaped reinforcing bar 5.
A slit 13 for inserting the second member 2 is opened horizontally.
In addition, there is a back wall 14 that rises substantially parallel to the vertical wall 12.

Reference numeral 15 denotes a mold for forming an end portion of the precast wall panel, which is formed by temporarily overlapping an inclined plate 16 for forming an inclined surface 10 between the concave spaces 4 shown in FIG. The vertical plate portion 17 to be fixed has a substantially "L" shape. A triangular convex portion 18 for forming the concave space 4 is integrated with the lower surface of the inclined plate 16 by welding or the like.

The triangular projection 18 is formed in the concave space 4 shown in FIG.
A bottom plate 181 that forms the bottom surface 41 of the above, a vertical plate 182 that forms the vertical surface 42 of the concave space 4, and both side plates 183 and 184 that form both side surfaces 43 and 44.

FIG. 5 is a perspective view of a mold 15 for forming a concave space, (1) is a perspective view seen from above, and (2) is a perspective view in a state of being inverted to show the shape of the lower side. is there. A vertical plate 182 and a bottom plate 181 are provided so that the concave space forming die 15 can be attached to and detached from the two arms 51 and 52 of the U-shaped reinforcing bar 5.
, The inclined plate 16 and the vertical plate portion 17, two parallel continuous slits S1, S2, S3 and S4 are formed.

FIGS. 6 and 7 are sectional views showing a method of manufacturing a precast wall panel and a corner panel using the molds of FIGS. 4 and 5, and FIG. 18 is a cross-sectional view at a position where slits S1, S2, S3 and S4 are formed, and FIG. 7 is a cross-sectional view at a position where no slit is formed.

First, the vertical wall 12 is placed on an iron plate 19 for underlaying.
Is fixed with bolts B1, and the tile 2 is placed inside the vertical wall 12.
Spread 0 and place a window frame or the like. Then, a reinforcing bar such as a reinforcing bar 21 is arranged on the upper side of the tile 20, and
The U-shaped reinforcing bar 5 is inserted through the horizontal slit 13 of the vertical wall 12, and the U-shaped tip 53 abuts against the back wall 14.

Next, the concave space forming die 15 is connected to the U-shaped reinforcing bar 5.
The two arms 51, 52 are put over the two arms 51, 52, and the two arms 51, 52 are inserted into the slits S1, S2, S3, S4 as shown in FIG. Then, the tightening plate 22 fixed to the upper end of the vertical plate portion 17 is superimposed on the tightening plate 23 at the upper end of the vertical mold wall 12, and the bolt / nut B2
Fix with. In addition, if necessary, the vertical plate portion 17 and the vertical mold wall 12 are overlapped and fastened and fixed with bolts and nuts B3. The U-shaped space above the inclined plate 16 may be closed by covering the lid plate 24.

In this state, the cover plate 24 is placed on the tile 20.
The concrete is poured to the height of, cured and hardened, but the slits S1, S2, S3, S3, S3, S3, S3, S3, S3, S3, S3, A soft packing material such as sponge or paper is packed in S4, and a gap between the slit S1 of the vertical plate 182 of the triangular projection 18 and the two arms 51 and 52 is closed with a gum tape or the like. Leave.

In this manner, the tile 2 is moved up to the height of the lid plate 24.
After hardening concrete by pouring it into the upper side of bolt 0, bolts and nuts B2 between clamping plates 22 and 23 are removed, and bolts and nuts B between vertical plate portion 17 and vertical mold wall 12 are further removed.
3, the concave space forming die 15 is pulled up using the hanging metal fittings 25, so that only the concave space forming die 15 can be removed and the mold released, leaving the U-shaped reinforcing bar 5 and the vertical wall 12.

Next, when the bolt B1 between the vertical wall 12 and the underlying iron plate 19 is removed and the vertical wall 12 is moved to the left side in the figure, the U-shaped reinforcing bar 5 is turned into the slit 1 shown in FIGS.
3, the vertical wall 12 and the back wall 14 can be released with the U-shaped reinforcing bar 5 left. Finally, removing the packing remaining under the two arms 51 and 52 completes the molding.

In order to insert the two arms 51 and 52 of the U-shaped rebar 5 into the slits S1, S2, S3 and S4, the molding device 15 must be installed first, and then the U-shaped rebar 5 Slits S4 → S3 → S1
Can be inserted from the side in this order.

Although the concave space 4 in FIGS. 1 and 2 has a triangular shape, it is not limited to this, and may be a concave curved surface or the like. Therefore, the shape of the triangular projection 18 in the mold 15 for forming the concave space is designed according to the shape of the concave space 4. The U-shaped reinforcing bar 5 may have a V-shape or a U-shape, and has a problem of strength. A structure with only one is also possible.

The molded precast wall panel is made of U
Since the positions of the U-shaped reinforcing bars 5 are the same, the adjacent U-shaped reinforcing bars 5a and 5b collide with each other when the precast wall panels are adjacent to each other. And 5b are bent in the opposite direction, for example, by about 5 mm so that they can be overlapped. Of course, by changing the depth of the slits S1, S3, S4 in the molding apparatus, it is also possible to mold the U-shaped rebars 5a and 5b in a state where their positions are shifted in advance.

[0048]

According to the precast wall panel of the present invention, the semi-annular reinforcing bars protrude from the ends through the space for filling concrete, and when the precast wall panels abut against each other, the adjacent semi-annular reinforcing bars are joined together. When the concrete is filled and hardened, the concrete acts as a canker and the adjacent precast wall panels are firmly connected to each other. Moreover, there is no variation in the connection strength due to the skill level unlike welding, and a highly reliable and uniform strength can be obtained.

According to the method for connecting precast wall panels according to the second aspect, it is only necessary to arrange the adjacent precast wall panels in abutting manner and to fill concrete in both concave spaces, so that a welder is arranged. It is not necessary to do it, and the construction period does not become longer due to welding,
In addition, the finished strength is strong and uniform.

According to the connecting structure of the precast wall panels according to the third aspect, since the semi-annular reinforcing bars projecting from the precast wall panels on both sides are embedded in the filled concrete in a state where they are overlapped with each other, both of the semi-annular portions are formed. Of the concrete is in the shape of a cannula, and both precast wall panels are firmly connected. As a result, the strength does not become uneven depending on the skill level as in the case of welding.

According to the molding apparatus of the fourth aspect, two parallel slits are formed below the convex portion for forming the concave space at the end of the precast wall panel so as to reach the lower end. Therefore, the molding device of the present invention can be molded by simply placing the semi-annular reinforcing bar on the two arms of the semi-annular reinforcing bar with the semi-annular reinforcing bar arranged. Further, after the concrete is cast and cast, when the molding apparatus of the present invention is lifted, the semi-annular reinforcing bar remains integrally with the precast wall panel, so that molding and release are simplified.

According to the manufacturing method of the fifth aspect, the forming device is placed over the two arm portions which have been arranged, and the two arm portions of the semi-circular reinforcing bar are inserted into the two slits. Since the concrete is poured into the slits on the lower side of the two arms and filled in the slits, the concrete is hardened, and then the mold is moved upward to release the mold.
A precast wall panel having a complicatedly shaped reinforcing bar composed of two arms and a semi-annular reinforcing bar protruding from an end can be easily mass-produced by a simple operation.

According to the sixth aspect, since the corner portion of the precast wall panel has a precast wall panel structure, unlike the conventional structure in which the corner portion is joined, there is no joint portion in the corner portion. It is possible to ensure the strength of the corner where a complicated and large force acts without a decrease in strength at the corner. Also,
Since the end of the corner panel has the same structure as the end of the precast wall panel, it can be molded using the same molding device, and the cost can be reduced by standardization.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a precast wall panel.

FIG. 2 is an embodiment of a connecting method and a connecting structure between precast wall panels, wherein (1) is a horizontal sectional view of a connecting portion,
(2) is a front view of a connection part, (3) is a perspective view showing an overlapping state of U-shaped rebars, and (4) is a horizontal cross-sectional view in a connection completed state.

FIG. 3 is a horizontal sectional view showing an embodiment of a corner portion of a precast wall panel building.

FIG. 4 is a perspective view showing a molding device for forming an end portion of a precast wall panel or a corner panel.

FIG. 5 is a perspective view of a mold for forming a concave space, (1).
Is a perspective view seen from above, and (2) is a perspective view in a state of being turned upside down.

6 and 7 are cross-sectional views illustrating a method of manufacturing a precast wall panel and a corner panel;
FIG. 6 is a cross-sectional view of a position where a slit is formed in the triangular protrusion of FIGS. 4 and 5.

FIG. 7 is a cross-sectional view of a position where no slit is formed in the triangular protrusion.

FIG. 8 is a horizontal sectional view showing a conventional connection structure between precast wall panels.

FIG. 9 is a horizontal sectional view of a corner connecting portion of the precast wall panel.

[0054]

[Explanation of symbols]

 P, P1, P2 Precast wall panel 1 Outer surface 2 Inner surface 3 End portion 4, 4a, 4b Recessed space 5, 5a, 5b U-shaped reinforcing bar 51, 52 Two arms of U-shaped reinforcing bar 6, f Filled concrete Cp Corner panel 15 Mold for forming end of precast wall panel 16 Inclined plate 18 Triangular protrusion S1 S2, S3, S4 Continuous slit 19 Underlay iron plate

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI E04B 1/61 E04B 1/60 503H

Claims (6)

[Claims] 1. Inside an end of a precast wall panel, for connecting adjacent precast wall panels,
A precast wall panel comprising a concave space for filling concrete, and a U-shaped or other semi-circular reinforcing bar fixed in the precast wall panel, protruding from an end portion through the concave space. 2. Inside the end of the precast wall panel,
Having a concave space for concrete filling, semi-annular reinforcing bars such as U-shaped fixed in precast wall panels,
The precast wall panels protruding from the ends through the concave space are made adjacent to each other, and concrete is spread over both concave spaces in a state where the ends of the adjacent precast wall panels are arranged in abutting manner. A method for connecting precast wall panels, characterized in that the semi-annular reinforcing bars protruding from the precast wall panels on both sides by filling are buried in filled concrete in a state of overlapping each other. 3. Inside the end of the precast wall panel,
Having a concave space for concrete filling, semi-annular reinforcing bars such as U-shaped fixed in precast wall panels,
The precast wall panels protruding from the ends via the concave space are adjacent to each other, the ends of the adjacent precast wall panels are arranged in abutting manner, and concrete is provided over both concave spaces. Characterized in that the semi-annular reinforcing bars projecting from the precast wall panels on both sides are embedded in the filled concrete so as to overlap each other. 4. Inside the end of the precast wall panel,
Having a concave space for concrete filling, semi-annular reinforcing bars such as U-shaped fixed in precast wall panels,
What is claimed is: 1. An apparatus for molding a precast wall panel projecting from an end portion through a concave space, comprising a convex portion for forming the concave space, and a semi-annular reinforcing bar 2 below the convex portion. An apparatus for molding a precast wall panel, wherein two parallel slits for receiving an arm portion of the book are formed so as to reach a lower end. 5. Inside the end of the precast wall panel,
Having a concave space for concrete filling, semi-annular reinforcing bars such as U-shaped fixed in precast wall panels,
In order to mold a precast wall panel projecting from an end portion through the concave space, a convex portion corresponding to the concave space is formed, and two slits parallel to each other are formed below the convex portion. Insert the two arms of the semi-circular rebar into the two slits using a molding device that is formed to reach the two slits, and then fill the lower slits with the filler. A method for manufacturing a precast wall panel, comprising: after pouring and hardening concrete in a set state, releasing the mold by moving the molding apparatus upward. 6. A corner portion of a wall portion of a building has a precast wall panel structure, and has a concave space for filling concrete inside the end portion thereof, and has a U-shaped or the like fixed in the corner panel. A semi-annular reinforcing bar protrudes from an end portion through the concave space, and a precast wall panel having a concave space and a semi-cyclic reinforcing bar similar to the above is adjacent to an end of the corner panel, and is adjacent to the corner panel. The ends of each precast panel are arranged in abutting manner, and the concrete is filled over both concave spaces, and the semi-annular reinforcing bars protruding from the precast panels on both sides overlap with each other in the filled concrete. The corner structure of the precast wall panel, which is embedded in the wall.