JP3194729B2 - Reinforced concrete structure, method of constructing reinforced concrete structure, and reinforcing bar restraint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete structure which is constrained so that a main reinforcing bar embedded in concrete does not protrude to the outside of the structure, and exhibits a large toughness when a large bending moment acts thereon. The present invention relates to a method for constructing such a reinforced concrete structure, and further relates to a reinforcing bar restraint used for such a reinforced concrete structure.

[0002]

2. Description of the Related Art Generally, in a reinforced concrete structure constituting a pier or the like of a bridge, a large number of main reinforcing bars for resisting tensile stress caused by a bending moment are arranged near the surface of the structure. For example, when a horizontal force at the time of an earthquake acts on such a reinforced concrete member, a large bending moment is repeatedly generated, compressive stress is generated in the concrete near one edge of the structure, and the concrete is disposed near the opposite edge. A large tensile stress occurs in the reinforcing bar. And
When the tensile stress of the reinforcing bar exceeds the yield point, the covering portion of the concrete covering the reinforcing bar is peeled off, and a force is exerted on the reinforcing bar to expand outward. When such reinforcement reinforces, the rigidity of the reinforced concrete structure rapidly decreases, and the reinforced concrete structure is destroyed. However, if the swelling of the main rebar is effectively constrained as described above, even after yielding of the rebar occurs, plastic deformation will occur, but some rigidity will be maintained, while absorbing large energy and leading to failure. The deformation increases, and the toughness of the structure can be increased.

[0003] For the above reasons, in important structures such as piers, it is required to arrange a band reinforcing bar so as to surround the main reinforcing bar in order to prevent the main reinforcing bar from bulging. Also,
In the case of wall-shaped piers, arch members of concrete arch bridges, etc., when the width of the member is large relative to the thickness of the member, even if the reinforcing bars surrounding the whole can not be effectively restrained from bulging the main reinforcing bar In such a case, there is provided an intermediate restraining bar for connecting the main reinforcing bars provided on both sides of the member in the thickness direction and restraining the main reinforcing bars from being displaced in a direction away from each other.

FIGS. 13 and 14 are schematic sectional views showing a conventional reinforcing bar restraining structure using the above-described intermediate restraining bars. The reinforcing bar restraining structure shown in FIG.
By engaging a pair of substantially parallel lateral reinforcing bars 102, 102 arranged outside the outside, that is, on the surface side of the member,
The main reinforcing bar 10 is connected via these transverse reinforcing bars 102,102.
1 and 101 are restricted from being displaced in a direction away from each other.

The reinforcing bar restraining structure shown in FIG. 14 uses an intermediate restraining bar 113 whose both ends are bent into a hook shape.
The main reinforcing bars 111, 111 are prevented from bulging outward through the lateral reinforcing bars.

[0006]

However, the above-described conventional reinforcing bar restraining structure has the following problems. The intermediate restraining bars 103 as shown in FIG. 13 are formed by bending into an annularly closed shape, and it is difficult to attach the transverse reinforcing bars 102 after disposing them. Therefore, the intermediate restraining bar 1 is arranged so as to surround the lateral reinforcing bar 102.
In order to dispose the intermediate reinforcing bars 103, the intermediate reinforcing bars 103 bent at predetermined positions are supported, and the transverse reinforcing bars 102 are sequentially inserted into the intermediate restraining bars 103 while being moved in the axial direction outside the main reinforcing bars 101. I have to do it. The main reinforcing bar 103 may have a large diameter of 32 mm or 51 mm.
Is not easily deformed, and it is extremely difficult to arrange the transverse reinforcing bar 102 while inserting it through the intermediate restraining bar 103.

[0007] When the intermediate restraining bar 113 shown in FIG. 14 is used, the same problem as described above occurs. In addition, when the intermediate restraining bar is used, the concrete near the hook-shaped bent portion is cracked. Progresses and the adhesive force with the intermediate restraining muscle is lost, the hook-shaped portion of the intermediate restraining muscle may be deformed, and the function of restraining the lateral reinforcing bar may be impaired.

[0008] The present invention has been made in view of such circumstances, and an object thereof is to effectively restrain the main reinforcing bar from bulging outward, and to facilitate the assembly of the reinforcing bar. Provided is a reinforced concrete structure and a method for constructing such a reinforced concrete structure, and a method for preventing the reinforced concrete structure from bulging out of the concrete structure when a large stress is applied to the reinforcing steel embedded in the concrete. The purpose of the present invention is to provide a reinforcing bar restraint for preventing the occurrence of the rebar.

[0009]

In order to solve the above-mentioned problems, an invention according to claim 1 is directed to a reinforced concrete structure which is raised up and down, in the vicinity of two corresponding side surfaces of the structure. A main reinforcing bar buried in the concrete, having an axis in the vertical direction, and a plurality of main reinforcing bars arranged substantially in parallel along the side surface; and having a substantially horizontal axis, and A plurality of lateral reinforcing bars arranged at predetermined intervals in the direction, a closed-shaped restraining jig surrounding the plurality of the horizontal reinforcing bars, and the restraining jigs respectively disposed near two corresponding side surfaces of the structure. And a bar-shaped intermediate connecting member for connecting the restraining jig with both ends locked by the fixture.

The two corresponding sides of the structure are generally two parallel sides formed on opposite sides of the structure, but need not necessarily be parallel and have a slight angle. It may be something. Further, the closed shape of the restraining jig is a hollow shape that is endlessly continuous and includes a circle, an ellipse, a polygon, and the like. The locking between the restraining jig and the intermediate connecting member can be performed in various ways as long as the tensile force in the axial direction of the intermediate connecting member is transmitted to the restraining jig so as to restrain the displacement of the lateral reinforcing bar. A structure can be adopted.

In the reinforced concrete structure having the above-described structure, the main rebar resists a bending moment based on a force acting in the horizontal direction such as a load at the time of an earthquake on the tension side, thereby preventing collapse of the structure. Act like so. And
When a large bending moment repeatedly acts, and the tensile stress of the main reinforcing bar exceeds the yield point stress, the strain of the reinforcing bar increases, the concrete near the side cracks and peels, and the main reinforcing bar tries to bulge outward. I do.

[0012] However, the lateral reinforcing bar disposed outside the main reinforcing bar is surrounded by a restraining jig, and this restraining jig is connected to a restraining jig surrounding the lateral reinforcing bar near the opposite side surface, so that the lateral reinforcing bar is outside each other. Is restricted. Accordingly, the displacement of the inner main reinforcing bar is restrained, and the main reinforcing bar is prevented from bulging outward.

Further, the restraining jig has a closed shape surrounding a plurality of transverse reinforcing bars, and a plurality of transverse reinforcing bars are restrained by a pair of restraining jigs and a single intermediate connecting member. Even if the number of intermediate connecting members is small, all the reinforcing bars can be restrained. Furthermore, since the restraining jig has a closed shape, the function of restraining the lateral reinforcing bars is not lost even if cracks in the concrete near the side face progress.

Further, since the two restraining jigs are connected by an intermediate connecting member to restrain the reinforcing bars near both sides, only the restraining jigs are mounted when assembling the horizontal reinforcing bars, and After placing the directional rebar in place,
The two connecting jigs can be connected by an intermediate connecting member. As a result, the work of arranging the rebar becomes remarkably easy,
Work efficiency is improved.

According to a second aspect of the present invention, there is provided the reinforced concrete structure according to the first aspect, wherein the restraining jig has a substantially triangular shape, and the lateral reinforcing bar extends so as to pass through two apex corners. It is assumed that the intermediate connecting member is arranged and fixed to the remaining apex portion by a nut screwed to the end portion.

In such a structure, the restraining jig has a substantially triangular shape, so that when a force is applied to the lateral reinforcing bar so as to bulge outward, the two lateral reinforcing bars become one. The force is restrained by the restraining jig, and the force is linearly transmitted to the joint with the intermediate connecting member. Therefore, a large bending moment or deformation is unlikely to occur in the restraining jig, and the reinforcing steel is securely restrained.

According to a third aspect of the present invention, there is provided a concrete plate-like member in which a reinforcing bar is buried substantially in parallel, and a closed-shaped restraining jig surrounding a plurality of the reinforcing bars has one part thereof. Forming a fixed precast concrete plate in a state protruding from the surface, and arranging a plurality of vertical reinforcing bars inside two side positions of the reinforced concrete structure to be constructed; and A step of disposing the precast concrete plates facing each other so that the surface on which the restraining jig protrudes is on the outside and the reinforcing bars surrounded by the restraining jigs are horizontal, and two opposing precast concrete plates. A step of joining both ends of a rod-shaped intermediate connecting member to the restraining jig protruding from and connecting two precast concrete members; There is provided a method for constructing a reinforced concrete structure characterized by comprising the step of pouring the concrete in Les cast concrete plates.

According to such a method, the reinforcing jig is fixed to the precast concrete member in a state where a reinforcing bar arranged in the lateral direction is inserted into the hollow portion of the restraining jig. The directional rebar and the restraining jig can be simultaneously arranged at a predetermined position.

As a result, labor for assembling the rebar and assembling the formwork is saved, and the working efficiency is improved. When arranging the precast concrete member at a predetermined position as a mold, the precast concrete member is installed so as to face each other, and both ends of the intermediate connecting member are respectively joined to a restraining jig projecting inward. The two opposing precast concrete members can be easily fixed at precise intervals. In addition, it is not necessary to separately adjust and support the intervals of the formwork with a separator or the like, and it is possible to eliminate the occurrence of traces of wood chips on the surface of the structure due to the use of the separator. Therefore, the finish on the surface of the structure is good.

The concrete constituting the structure is cast between the precast concrete members arranged opposite to each other as described above. At this time, the precast concrete member functions as a formwork, and after the concrete is hardened, Become a part of the structure. When the structure is formed in this way, the restraining jig is partially embedded in the precast concrete member, and the remaining portion is embedded in newly cast concrete. The newly cast concrete is connected by the restraining jig, so that both concretes have high integrity. Furthermore, since a part of the restraining jig protrudes from the precast concrete member, it can be used to facilitate the handling of the precast concrete member, such as lifting and transportation.

According to a fourth aspect of the present invention, there is provided the method of constructing a reinforced concrete structure according to the third aspect, wherein the restraining jig is provided substantially perpendicular to a surface of the precast concrete member at a portion protruding from the precast concrete member. The intermediate connecting member has threads formed at both ends, and both ends are inserted through the openings, and two nuts screwed to the respective ends. The restraining jig is connected to the restraining jig so as to sandwich the vicinity of the opening.

By joining the intermediate connecting member and the restraining jig as described above, the operation is simplified and the efficiency is improved. In addition, the positions of the two precast concrete members arranged opposite to each other are easily adjusted and the positions are adjusted. It can be fixed.

According to a fifth aspect of the present invention, there is provided a closed, substantially triangular shape surrounding a plurality of reinforcing bars arranged substantially in parallel in a reinforced concrete member, and at one apex portion, substantially toward the center of the triangle. It has two restraining jigs provided with openings, and a rod-shaped intermediate connecting member made of steel having threads formed at both ends, wherein the intermediate connecting member is configured to open the two restraining jigs. Both ends are respectively inserted into the holes, and both ends of the intermediate connecting member are locked to the restraining jig by nuts screwed to the ends, respectively. Is what you do.

In such a reinforcing bar restraining jig, for example, it is possible to connect the reinforcing bars arranged near the opposite surfaces of the structure to firmly restrain the outward displacement. In addition, the restraining jig which is inserted into the reinforcing bar in advance and the intermediate connecting member for connecting the two restraining jigs are separate members, and these can be easily joined by a nut. After being positioned, the intermediate coupling member can be attached. Therefore, the work of arranging the reinforcing bar and arranging the reinforcing bar restraining jig can be efficiently performed.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of a prestressed concrete bridge whose pier is made of a reinforced concrete structure according to the present invention. In this bridge, a prestressed concrete girder 5 is bridged between the abutments 1 and 4 and the piers 2 and 3 and between the pier 2 and the pier 3 to form a three-span continuous bridge.

FIG. 2 is a schematic sectional view showing a pier 2 of the bridge. This pier 2 is an embodiment of a reinforced concrete structure according to the first or second aspect of the present invention.
FIG. 3 is a cross-sectional view taken along the line II shown in FIG.
The pier 2 is a reinforced concrete wall-shaped structure raised on the footing 10, and a plurality of main reinforcing bars 11 are vertically arranged at predetermined intervals in concrete near two opposing side surfaces. I have. A plurality of lateral reinforcing bars 12 are arranged at predetermined intervals closer to the side than the main reinforcing bars 11. In addition, a plurality of reinforcing bar restraints 13 are arranged so as to connect the lateral reinforcing bars 12 arranged near both side surfaces of the pier 2 to each other.

The reinforcing bar restraint 13 includes a substantially triangular restraining jig 14 disposed so as to surround two of the lateral reinforcing bars 12, and two restraining jigs disposed near corresponding side surfaces of the structure. And a rod-shaped intermediate connecting member 15 for connecting the two. And, by the plurality of reinforcing bar restraints 13,
The displacement of the lateral reinforcing bar 12 to the outside is restricted. The reinforcing bar restraint 13 is an embodiment of the invention described in claim 5.

The main reinforcing bar 11 is a deformed steel bar having a diameter of 32 mm and arranged in the vertical direction, and a plurality thereof are arranged substantially parallel to the side surface of the pier 2. The lateral reinforcing bar 12 is a deformed steel bar having a diameter of 25 mm arranged substantially horizontally, and a plurality of lateral reinforcing bars 12 are arranged in a vertical direction by about 150 m.
They are arranged at intervals of m to 200 mm.

As shown in FIGS. 4 and 5, the restraining jig 14 is made of cast iron formed into a substantially triangular shape, and has the horizontal reinforcing bar 12 disposed inside the two apex portions. I have. An opening 14 a through which the intermediate connecting member 15 is inserted is provided in the remaining apex of the restraining jig 14.

The intermediate connecting member 15 is made of a PC steel rod, and has a thread at both ends. Then, both ends of the intermediate connecting member 15 are respectively inserted into the openings 14a of the two restraining jigs 14, and nuts 16 are screwed to the ends. Thereby, both ends of the intermediate connecting member 15 are locked to the two restraining jigs 14.

In such a pier, the lateral reinforcing bar 12 disposed outside the main reinforcing bar 11 is surrounded by the restraining jig 14, and the restraining jig 14 is configured to surround the opposite lateral reinforcing bar 12. Therefore, these lateral reinforcing bars 12 are restrained from being displaced outward. Accordingly, the displacement of the main reinforcing bar 11 inside the lateral reinforcing bar 12 is also restrained, and the main reinforcing bar 11 is prevented from bulging outward. That is, for example, when a large bending moment is repeatedly applied as in the case of an earthquake, a large degree of tensile stress exceeding the yield point is generated in the main reinforcing bar 11, and further, when a compressive force is applied thereafter, the outer side is applied to the main reinforcing bar 11. A force to deform so as to bulge occurs. However, the deformation is restrained by the lateral reinforcing bars 12 arranged outside the main reinforcing bars 11. Along with this, the destruction of the concrete inside the main reinforcing bar 11 is also suppressed, the toughness of the entire member is improved, and the amount of energy absorbed until the destruction is increased. Therefore, the strength of the pier against ultimate destruction is increased.

Since the restraining jig 14 has a substantially triangular shape, when a force is applied to the lateral reinforcing bar 12 so as to bulge outward, a tensile force acts on the restraining jig 14 and a straight line is formed. And transmitted to the joint with the intermediate connecting member 15. Therefore, a large bending moment or deformation is unlikely to occur in the restraining jig 14, and the lateral reinforcing bar 12 and the main reinforcing bar 11 are reliably restrained.

Further, the restraining jig 14 has a shape surrounding the two lateral reinforcing bars 12, and a pair of restraining jigs 14 is provided.
And one intermediate connecting member 15 restrains the two lateral reinforcing bars 12 on both sides, so that it is not necessary to provide an intermediate connecting member for each of the transverse reinforcing bars 12, and the intermediate connecting member 1
The number of 5 is reduced. Further, since the restraining jig 14 has a closed shape of a triangle, the function of restraining the lateral reinforcing bar 12 is not lost even if cracks in the concrete near the side face progress.

The restraining jig 1 used in the pier 2
Reference numeral 4 denotes a cast product, but instead of this, a belt-shaped steel material is bent into a triangular shape as shown in FIG.
A restraining jig 24 having an opening 24a at the joint may be used. By inserting the intermediate connecting member through the opening 24a of the restraining jig 24 and screwing the nut, the intermediate connecting member can be locked to the restraining jig 24 as described above.

Next, a description will be given of a tensile test of the reinforcing bar restraining device performed on the assumption that a force to expand outwardly acts on the lateral reinforcing bar 12. FIG. 7 is a schematic view showing a restraining jig and an apparatus for performing a tensile test of an intermediate connecting member and a specimen which constitute the above-described reinforcing bar restraint. In this tensile test, as shown in FIGS. 7A and 7B, a steel bar 51 assuming the transverse reinforcing bar 12 is restrained by two steel plates 50,
The two restraining jigs 14 and 14 are locked at the corners. PC steel rods serving as intermediate connecting members are joined to the two restraining jigs 14 and 14 on opposite sides. Then, a uniaxial tensile load that continuously increases in the opposite direction is applied to the two PC steel rods 20, and simultaneously with the load, the strain of the PC steel rod is measured by a strain gauge (not shown) to record a load-strain curve. I do.

FIG. 8 is a graph showing the results of the tensile test, showing the relationship between the strain of the PC steel bar 20 and the tensile load. As shown in this graph, even when a tensile load is applied to the PC steel bar 20 (A type 1, No. 23 mm) at a yield point or higher, no excessive deformation occurs in the restraining jig. It was confirmed that the PC steel bar yielded. Therefore, the restraining jig 14 to which the PC steel bar 20 is locked does not become a weak point, and it is understood that the main reinforcing bar 11 can be reliably restrained by the reinforcing bar restraining tool.

Next, a method of constructing a reinforced concrete structure according to an embodiment of the present invention, that is, a method of constructing a skeleton portion of a pier shown in FIG. 2 will be described. As shown in FIG.
A plurality of main rebars 31 are arranged vertically above zero. These main reinforcing bars 31 are arranged inside the two side positions of the bridge pier body to be constructed, and are connected to the reinforcing bars 40 embedded and fixed in the footing by gas pressure welding or mechanical joints. I have.

As shown in FIG. 11, a concrete plate-like member in which a reinforcing bar 33 is embedded substantially in parallel,
A triangular restraining jig 34 surrounds the two reinforcing bars.
Are pre-manufactured. The concrete plate 32 has a vertex corner having an opening of the restraining jig 34 partially buried in a state protruding from one surface, and a reinforcing bar 33 is arranged so as to cross the inside of the other vertex. It is. This rebar 33
It is used as a lateral reinforcing bar for the pier frame.

The above precast concrete plate 32 is
As shown in FIG. 9 (b), it is installed on the outside of the main reinforcing bar 31 so that the surface from which the restraining jig 34 protrudes is inside and opposed. At this time, since a part of the restraining jig 34 protrudes from the precast concrete plate 32, the precast concrete plate 32 can be used to lift it and be easily installed at a desired position.

Then, as shown in FIG. 12, both ends of the intermediate connecting member 35 in which nuts 37 are screwed in advance are inserted into restraining jigs 34 protruding from the two opposing precast concrete plates 32. Another nut 36 is screwed into the portion from the inside of the restraining jig 34. And
The intermediate connecting member 35 is joined so that the vicinity of the opening of the restraining jig is sandwiched between the two nuts 34 and 37. By joining the intermediate connecting members 35 to the plurality of opposing restraining jigs 34 in this manner, the two precast concrete plates 32 are firmly connected. Thereafter, as shown in FIG. 10, concrete 38 is poured between the two precast concrete plates 32 and hardened. Thereby, a reinforced concrete structure is constructed, and the two precast concrete plates 32 become a part of the structure. At this time, since the precast concrete plate 32 and the newly cast concrete are connected by the restraining jig 34, the integrity of both concretes is increased.

In such a method for constructing a concrete structure, the precast concrete plate 32 functions as a formwork, and the precast concrete plate 32 is erected so that the lateral reinforcing bar 33 and the restraining jig 34 are provided.
Can be simultaneously placed in a predetermined position. For this reason, the assembling of the rebar and the assembling of the mold are labor-saving, and the working efficiency is improved. In addition, by joining both ends of the intermediate connecting member 35 to the restraining jigs 34 projecting into the inside of the two precast concrete plates 32, respectively, the two opposing precast concrete plates 32 can be easily fixed at precise intervals. it can.

[0042]

As described above, in the reinforced concrete structure according to the first or second aspect of the present invention,
Lateral reinforcing bars arranged outside the main reinforcing bar are surrounded by a restraining jig, and this restraining jig is connected to a restraining jig surrounding the horizontal reinforcing bar near the opposite side surface, so that the outer side of each other is The displacement is constrained, and even if a large force acts during an earthquake, it is possible to suppress the main rebar from bulging outward. For this reason, the compressive buckling of the structure due to the repeated action of the large bending moment can be suppressed, and the amount of deformation and the amount of energy absorbed until ultimate failure can be increased.

In the method for constructing a reinforced concrete structure according to the third or fourth aspect of the present invention, a precast concrete plate to which a restraining jig is fixed in a state where a lateral reinforcing bar is inserted is used as a formwork of the structure. Since it is used, labor for assembling the rebar and assembling the formwork can be saved, and the assembling work can be performed efficiently. In addition, by installing the precast concrete plates so as to face each other and joining the intermediate connecting member to the restraining jig, the two precast concrete plates can be easily fixed at accurate intervals and the construction can be rationalized. it can.

In the rebar restraining jig according to the fifth aspect of the present invention, since the restraining jig has a closed shape, the displacement of the rebar disposed in the concrete member can be maintained even when the concrete is cracked. Can be restrained.
Further, since the restraining jig in which the reinforcing bar is inserted in advance and the intermediate connecting member connecting the two restraining jigs can be easily joined by the nut, the intermediate connecting member is attached after the reinforcing bar is arranged at a predetermined position. And workability is improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a prestressed concrete bridge whose pier is made of a reinforced concrete structure according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a pier of the prestressed concrete bridge shown in FIG. 1 and showing a reinforced concrete structure according to an embodiment of the present invention described in claim 1 or 2;

FIG. 3 shows the I of the reinforced concrete structure shown in FIG.
It is sectional drawing in the -I line.

FIG. 4 is a partially enlarged view of the reinforced concrete structure, and is a schematic cross-sectional view showing a reinforcing bar restraint according to an embodiment of the present invention.

FIG. 5 is a schematic view showing a restraining jig used for the reinforced concrete structure.

FIG. 6 is a schematic view showing another example of a restraining jig used for the reinforced concrete structure.

FIG. 7 is a schematic diagram showing an apparatus and a specimen for performing a tensile test of a reinforcing bar restraining jig.

FIG. 8 shows P in a tensile test using the test piece shown in FIG.
It is a figure which shows the relationship between the tensile load and distortion of C steel rod.

FIG. 9 is a schematic view showing a construction stage in a method of constructing a reinforced concrete structure according to an embodiment of the invention described in claim 3 or 4;

FIG. 10 is a schematic diagram showing a construction stage in a method of constructing a reinforced concrete structure according to an embodiment of the invention described in claim 3 or 4.

FIG. 11 is an enlarged view showing a construction stage in a method for constructing a reinforced concrete structure according to an embodiment of the invention described in claim 3 or 4;

FIG. 12 is an enlarged view showing a construction stage in a method of constructing a reinforced concrete structure according to an embodiment of the invention described in claim 3 or 4;

FIG. 13 is a schematic view showing a state in which a reinforcing bar is restricted in a conventional reinforced concrete structure.

FIG. 14 is a schematic view showing another example of a state in which a reinforcing bar is restricted in a conventional reinforced concrete structure.

[Explanation of symbols]

 Reference Signs List 1,4 Abutment 2,3 Abutment 5 Prestressed concrete girder 10 Footing 11 Main reinforcing bar 12 Lateral reinforcing bar 13 Reinforcing bar restraint 14,24 Restricting jig 15 Intermediate connecting member 16 Nut 30 Footing 31 Main reinforcing bar 32 Precast concrete plate 33 Reinforcing bar 34 Restraining Jig 35 Intermediate connecting member 36, 37 Nut 38 Concrete

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI E04C 5/18 104 E04C 5/18 104 (72) Inventor Hideo Arai 13-4 Arakicho, Shinjuku-ku, Tokyo Sumitomo Construction Co., Ltd. (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04B 2/86 E04B 2/84 E04C 5/18 E04G 17/04-17/075

Claims (5)

(57) [Claims] Claims: 1. A reinforced concrete structure which is vertically erected, embedded in concrete near two corresponding side surfaces of the structure, has an axis in a vertical direction, and substantially extends along the side surface. A plurality of main reinforcing bars arranged in parallel with each other, a plurality of horizontal reinforcing bars having a substantially horizontal axis, and arranged at predetermined intervals in the vertical direction nearer to the side than the main reinforcing bars; A constraining jig having a closed shape surrounding the rod, a rod-shaped intermediate connecting member having both ends locked by the constraining jigs respectively disposed near two corresponding side surfaces of the structure, and connecting the constraining jigs; A reinforced concrete structure comprising: 2. The restraining jig has a substantially triangular shape, the lateral reinforcing bar is disposed so as to pass through the inside of two apex portions, and the intermediate connecting member is provided at the remaining apex portions and at the end portions. The reinforced concrete structure according to claim 1, wherein the reinforced concrete structure is locked by a screwed nut. 3. A concrete plate-like member having reinforcing bars embedded substantially parallel thereto, wherein a closed-shaped restraining jig surrounding a plurality of the reinforcing bars is provided with a part thereof protruding from one surface. A step of forming a fixed precast concrete plate; a step of arranging a plurality of vertical reinforcing bars inside two side positions of a reinforced concrete structure to be constructed; and the restraining jig outside the main reinforcing bars. A step of placing the precast concrete plates facing each other such that the protruding surface is on the inside and the reinforcing bars surrounded by the restraining jigs are substantially horizontal, and the restraining jigs protruding from the two opposing precast concrete plates. Joining the two ends of the rod-shaped intermediate connecting member to connect two precast concrete plates; and the two precast concrete plates. Method for constructing a reinforced concrete structure characterized by comprising the step of pouring concrete between. 4. The restraining jig has an opening in a portion protruding from the precast concrete plate, the hole being substantially perpendicular to the surface of the precast concrete plate, and the intermediate connecting member has threads at both ends. Formed,
Both ends are inserted into the opening and connected to the restraining jig by two nuts screwed to respective ends so as to sandwich the vicinity of the opening of the restraining jig. 4. The method for constructing a reinforced concrete structure according to 3. 5. A closed triangle having a substantially triangular shape surrounding a plurality of reinforcing bars arranged substantially in parallel in a reinforced concrete member, wherein one apex is provided with an opening toward substantially the center of the triangle. And two rod-shaped intermediate connecting members made of steel having threads formed at both ends thereof. The intermediate connecting member passes both ends through the openings of the two restricting jigs, respectively. A rebar restraining device, wherein both ends of the intermediate connecting member are locked to the restraining jig by nuts screwed to the ends.