JP2015010414A - Manufacturing method of reinforced concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforced concrete member capable of preventing the yield strength after a break has occurred from decreasing.SOLUTION: A core 1, which is formed with a material having a tensile strength higher than a concrete 21 within a frame mold 4, and the adhesion of which with the concrete 21 is broken when the hardened concrete 21 is deformed exceeding a predetermined magnitude, is disposed along a main reinforcement 22 being separated from an inner wall of the frame mold 4. And subsequently, the concrete 21 is flown in the frame mold 4 until the main reinforcement 22 and the core 1 are embedded and hardened. When the deformation of the reinforced concrete member 10 develops to a certain extent, since the core having a larger tensile strength bears the load, the yield strength of the reinforced concrete member is prevented from decreasing.

Description

  The present invention relates to a method for manufacturing a reinforced concrete member constituting a concrete structure.

Concrete is a material widely used for pillars and beams of structures such as viaducts. Although concrete has a high compressive strength, it alone has a property of low tensile strength and easily brittle fracture. For this reason, when constructing a structure with concrete, in order to prevent brittle fracture, a predetermined yield strength is exhibited by disposing a steel material at a location where tensile stress acts.
The structure of concrete reinforced with steel is classified according to the type of steel. Specifically, those reinforced with steel bars are classified as reinforced concrete (RC) structures, and those reinforced with steel bars and shaped steel (H-shaped steel, angle steel) are classified as steel reinforced concrete (SRC) structures (Patent Document 1,). 2).

  By the way, when a predetermined or more stress is applied to a reinforced concrete member having an RC structure or an SRC structure due to a large earthquake or the like, the reinforcing bar or the steel frame inside may yield and the concrete portion may be destroyed. The failure modes of reinforced concrete members are classified into two types: bending failure and shear failure. Bending failure is a failure mode that occurs when the concrete subjected to compressive stress exceeds the limit value of compressive strength, and is characterized by the occurrence of a state called crushing in which the concrete peels in layers. Further, the shear fracture occurs when the shear fracture proof strength is smaller than the bending fracture proof strength, and is characterized by a large oblique crack and is a fracture mode in which the member is displaced and divided.

JP 2011-220107 A JP 2007-2578 A

Although there is a slight difference in the tendency of reinforced concrete members depending on which destruction mode, there is a difficulty in that once the fracture starts, the proof strength cannot be stopped. FIG. 2 (b) shows the load displacement characteristics of a conventional reinforced concrete member. As shown here, the conventional reinforced concrete member begins to crack when the acting load reaches Pcr, When Py is reached, the reinforcing bars and steel frames begin to yield. Then, after the load reaches the maximum load Pu, the reinforced concrete member is completely destroyed, and thereafter, even if a load having a size less than the maximum load Pu is applied, the reinforced concrete member is displaced greatly. This is because the stress acting on the portion where the damage is concentrated is larger, and the stress continues to act on the portion, so that the fracture region is gradually expanded without being able to bear the stress.
In this worst case, the reinforced concrete member that has once started to break and the proof strength has been decreasing cannot suppress the increase in displacement of other members joined to this member. There is a risk of causing collapse of the entire structure.

  This invention is made | formed in view of said subject, and it aims at providing the reinforced concrete member which can stop the fall of the yield strength after a fracture | rupture arises on the way.

  In order to solve the above-mentioned problems, the first invention is to manufacture a reinforced concrete member in which a main reinforcing bar is disposed from one end to the other end of the mold in the mold, and then concrete is poured into the mold and solidified. In the method, a core part that is formed of a material having a higher tensile strength than the concrete and is solidified in the mold after being solidified or deformed more than a predetermined amount, the core part that is not attached to the concrete is Arrange along the main rebar and away from the inner wall of the formwork, and then pour and solidify the concrete into the formwork until the main rebar and the core are buried. It is characterized by.

In this case, the concrete is formed of a material having a higher tensile strength than the concrete, and includes a core portion disposed along the main reinforcing bar. A reinforced concrete member is produced in which the adhesion between the core and the concrete is cut.
In this reinforced concrete member, when the stress is applied, the adhesion between the core part and the concrete breaks, and thereafter, the core part does not receive the stress, and the stress is received in the reinforced concrete part composed of the peripheral concrete and the main reinforcement. It becomes like this. When the stress (deformation) further increases, the reinforced concrete portion begins to break and cannot bear the load, so the proof concrete member's proof stress gradually decreases and the reinforced concrete member is deformed. However, when the deformation of the reinforced concrete member reaches a certain size, the core portion having a high tensile strength is responsible for the load, and the decrease in the proof stress of the reinforced concrete member can be prevented. As a result, it is possible to prevent the displacement of other members joined to the reinforced concrete member from increasing.

Preferably, in the first invention, the core portion is formed by pouring an epoxy resin, a thermosetting resin, or a high toughness cement composite material into a collection of aggregates and solidifying the aggregate. Good.
Since these materials have a higher tensile strength than concrete when solidified, in this way, it is only necessary to place a solidified one of these materials in a formwork and fill it with concrete. A core part can be formed.

Desirably, in the first invention, the material, length, cross-sectional dimensions, surface roughness, and location of the core necessary for the reinforced concrete member to be manufactured to exhibit desired load displacement characteristics. Any one of the number of arrangements may be calculated, and the core may be formed and arranged based on the calculation result.
If it does in this way, the load displacement characteristic of a reinforced concrete member can be made optimal for the concrete structure to be constructed, and the concrete structure can be made tougher.
In addition, since the core portion can be formed in a concentrated manner where breakage easily occurs, a reinforced concrete member that is less likely to break can be manufactured.
Furthermore, since it is not necessary to form a core part in the location which is comparatively hard to break, the manufacturing cost of the reinforced concrete structure can be reduced.

  Moreover, in order to solve the said subject, 2nd invention arrange | positions the main reinforcement in the mold from one end of the said mold to the other end, and then poured concrete into the said mold and solidifies it. In the manufacturing method, a member having a space in the mold and having an opening leading to the space is arranged along the main reinforcing bar and away from the inner wall of the mold. And then pouring concrete into the mold so as not to close the opening, and then injecting epoxy resin, thermosetting resin, or high toughness cement composite material into the space from the opening. It is characterized by.

In this way, it is possible to manufacture a reinforced concrete member having a core part in the concrete that is substantially the same as in the first invention and has a core part that has a tensile strength higher than that of the concrete and that is lower than the main reinforcing bar. it can.
Further, it is possible to form the core after the concrete structure is constructed with the internal space left, that is, after the outer peripheral portion of the concrete member is formed first.

Preferably, in the second invention described above, a pipe having an aggregate formed by collecting a plurality of aggregates so as to have voids therein as the member having the space and the space and the opening. The concrete is poured into the formwork so that the other end of the pipe is not buried, and the concrete remains in the aggregate from the other end of the pipe without entering. The epoxy resin, the thermosetting resin, or the high toughness cement composite material may be injected into the void.
If it does in this way, when pouring concrete, since aggregate supports concrete, it can prevent that a space collapses.
Moreover, since the usage-amount of material can be suppressed compared with the case where all the core parts are formed with these materials, the manufacturing cost of a reinforced concrete member can be reduced.
In particular, in the case of an epoxy resin or a thermosetting resin, the shrinkage at the time of solidification becomes a problem, but in this way, the degree of shrinkage of the resin is small compared to the case where the core part is entirely made of resin. As a result, it is possible to prevent a large gap between the concrete and the core portion from deteriorating and the function of handling the load of the core portion after the reinforced concrete portion is destroyed.

Preferably, in the second aspect of the invention, the aggregate is formed by packing the plurality of aggregates in a ridge.
In this way, an aggregate can be easily formed as compared to the case where aggregates are bonded together.

Preferably, in the second invention, a container containing the epoxy resin, the thermosetting resin, or the high toughness cement composite material is connected to the opening, and the container is disposed above the opening. The epoxy resin, the thermosetting resin, or the high toughness cement composite material may be injected using the weight.
In this way, not only a device for press-fitting is not necessary, but also the gap can be more reliably filled by being slowly injected at a low pressure.

  ADVANTAGE OF THE INVENTION According to this invention, even if a fracture | rupture arises, the reinforced concrete member which can stop the fall of yield strength on the way can be provided.

It is the figure which cut and showed a part of concrete about the reinforced concrete member which concerns on 1st Embodiment of 1st invention, (a) is a thing when it cuts along the arrangement | positioning direction of a main reinforcing bar, (b) is It is a thing when it cuts along the arrangement | positioning direction of a shear reinforcement bar. It is a graph which shows the relationship between the load made to act on the reinforced concrete member, and the displacement (deformation) amount of this member, (a) is measured using the reinforced concrete member shown in FIG. 1, (b) is the conventional reinforced concrete member. It was measured using. It is a figure which shows the manufacturing method of the reinforced concrete member of FIG. It is the figure which cut and showed a part of concrete along the arrangement | positioning direction of a shear reinforcement reinforcing bar, the reinforced concrete member which concerns on 2nd Embodiment of 1st invention. It is a figure which shows the manufacturing method of the reinforced concrete member which concerns on embodiment of 2nd invention.

<First Embodiment of the First Invention>
Hereinafter, a first embodiment of the first invention will be described in detail with reference to the drawings.

[Structure of reinforced concrete members]
First, the structure of a reinforced concrete beam (hereinafter, beam 10), which is a reinforced concrete member in the present embodiment, will be described. FIG. 1 is a view of the beam 10 cut out from only a portion of the concrete.
The beam 10 is horizontally provided between the two pillars P as shown in FIG. The beam 10 includes a core portion 1 and a reinforced concrete portion (hereinafter referred to as an RC portion 2) provided around the core portion 1.

  The core portion 1 is formed in a prismatic shape by a binder 11 and gravel (aggregate) 12 so as to fill the space inside the RC portion 2. The binder 11 used in this embodiment is a resin that is cured using a curing agent such as an epoxy resin, a thermosetting resin (resin), a high toughness cement composite material, or the like. The solidified binder 11 has a higher tensile strength than the concrete 21, and the adhesion strength with the concrete 21 (the maximum value of the force required for pulling out the object in the concrete and the force required for the extrusion is determined by the concrete. The value divided by the area where the object and the object come into contact with each other) is lower than the adhesion strength between the steel (the main reinforcing bar 22 and the shear reinforcing bar 23 described later) and the concrete.

The RC portion 2 is formed in a prismatic shape with concrete 21, and a plurality of main reinforcing bars 22 and a plurality of shear reinforcing reinforcing bars 23 are disposed therein.
As shown in FIG. 1A, a plurality of main reinforcing bars 22 are arranged along the longitudinal direction of the beam 10 above and below the core portion 1, that is, above and below the RC portion 2. As shown in FIG. 1B, the main reinforcing bars 22 are arranged in a line along the upper surface and the lower surface of the RC portion 2. In addition, one end of each main reinforcing bar 22 is fixed to one column P, and the other end is fixed to the other column P.

  As shown in FIG. 1B, the shear reinforcing bar 23 is a rectangle that is slightly smaller than the rectangular shape of the cross section of the beam 10 cut in a direction orthogonal to the direction in which the main reinforcing bar 22 is disposed. A plurality of main reinforcing bars 22 and the core portion 1 are arranged at equal intervals so as to pass inside. Note that the number of shear reinforcement bars in the beam 10 is less than the number required by conventional reinforced concrete members. This is because the proof strength against the shear stress of the beam 10 is enhanced by the core portion 1. Hereinafter, when the main reinforcing bar 22 and the shear reinforcing bar 23 are not distinguished from each other, they are represented as reinforcing bars 22 and 23.

[Load displacement characteristics of reinforced concrete members]
Next, the load displacement characteristics of the beam 10 will be described.
First, both ends of the beam 10 were placed on a platform of a measuring device (not shown), a downward load was applied to the center of the upper surface of the beam 10, and the downward displacement (deformation) amount of the center of the beam 10 was measured. FIG. 2A is a graph showing the relationship between the load and the displacement at that time.

  As shown in FIG. 2A, when a load having a size P1 is applied to the central portion of the beam 10, a crack is generated in the lower portion of the concrete 21, and the central portion of the beam 10 is displaced downward by D1. Then, the adhesion between the core portion 1 and the concrete 21 is cut. Thereafter, until the maximum load P2 is reached, the displacement increases as the load increases. When the maximum load P2 is reached, the concrete 21 of the RC portion 2 undergoes bending failure or shear failure. At this time, the adhesion between the core part 1 and the concrete 21 is cut, and the strength of the bonding material 11 forming the core part 1 is extremely high, so that the breakage of the RC part 2 hardly affects the core part 1. After the concrete 21 is destroyed, the proof strength of the beam 10 is reduced, and even if a load having a magnitude less than the maximum load P2 is applied, the beam 21 is displaced beyond the displacement amount D2. In the state in which the destruction has progressed most, the displacement amount reaches D3 only by the action of the load P3 that greatly falls below the maximum load P2.

However, after the amount of displacement reaches D3, the core 1 and the main rebar 22 are responsible for the load, so the proof strength of the beam 10 is restored again, and in some cases, the load P4 exceeds the maximum load P2. Will be able to.
In the present invention, the state of the surface of the core portion 1 is not particularly specified. This is because smoothing the surface of the core portion 1 reduces the adhesion strength between the core portion 1 and the RC portion 2, but it is considered that the same effect as when the surface is rough can be obtained.
The graph shown here is an example, and the load displacement of the beam 10 can be changed by changing the design of the material, length, cross-sectional dimension, surface roughness, arrangement position, arrangement number, etc. of the core 1. The characteristic (the position of the extreme value drawn by the curve) can be adjusted as appropriate.

[Method of manufacturing reinforced concrete members]
Next, a method for manufacturing the beam 10 will be described. FIG. 3 shows a manufacturing process of the beam 10.
The beam 10 of this embodiment is manufactured through a design process S1, a core manufacturing process S2, a reinforcing bar / core arranging process S3, and a concrete filling process S4.

(Design / Formwork Manufacturing Process S1)
In the initial design / formwork manufacturing step S1, first, the beam 10 to be manufactured is designed. This step is usually performed when designing the entire concrete structure including the beam 10 as a constituent element. Specifically, the material, length, cross-sectional dimensions, surface roughness, and arrangement of the core 1 necessary to obtain the desired load displacement characteristics (determine where to bring the fracture peak of the RC part 2) are determined. The installation position (the region where the shear stress acts most), the number of arrangements, the number of reinforcing bars 22 and 23, and the like are obtained by calculation. Then, based on the obtained calculation results, the core mold 3 (see FIG. 3A), the RC mold 4 (see FIG. 3B), and a necessary quantity of materials are prepared. To do.

(Core manufacturing process S2)
After the materials and the molds 3 and 4 are prepared, the process proceeds to the core manufacturing process S2. In the core manufacturing step S2, first, the aggregate 12 is packed into the core mold 3. Then, the binder 11 is poured into the mold 3. When the binding material 11 is solidified, the core portion 1 is completed as shown in FIG.

(Reinforcing bar / core arrangement step S3)
After the core part 1 is manufactured, the process proceeds to the reinforcing bar / core part arranging step S3. In the reinforcing bar / core arrangement step S3, first, as shown in FIG. 3 (b), a main reinforcing bar 22 to be positioned below the RC part 2 is formed in the RC part mold 4 and made of mortar. Alternatively, a concrete spacer 5 is used so as to be separated from the bottom surface of the mold 4 and the side surface along the main reinforcing bar 22 arranging direction, and both ends of the main reinforcing bar 22 are formed on the side walls of the mold 4. Pass through the reinforcing bar through hole (not shown). Although illustration is omitted, when the main reinforcing bar 22 is disposed, a shear reinforcing bar 23 is passed through the main reinforcing bar 22 in advance so that the side wall of the mold 4 and the spacer 5 do not get in the way later. Then, as shown in FIG. 3C, the core portion 1 is separated from the arranged main reinforcing bars 22 by using a mortar or concrete spacer 6 above the arranged main reinforcing bars 22. And it arrange | positions so that the arrangement | positioning direction of the main reinforcement 22 may be followed. And as shown in FIG.3 (d), the main reinforcement 22 which will be located in the upper part of the shear reinforcement reinforcement 23 and RC part 2 is assembled.

(Concrete filling process S4)
After the core portion 1 is disposed at a predetermined position in the formwork and the reinforcing bars 22 and 23 are assembled, the process proceeds to the concrete filling step S4. In the concrete filling step S4, a predetermined amount of concrete 21 is poured into the mold 4. Then, as shown in FIG.3 (e), the core part 1 and the reinforcing bars 22 and 23 are buried in concrete. Thereafter, the concrete 21 is cured and solidified. As the concrete 21 solidifies, the spacers 5 and 6 become part of the RC portion 2. When the concrete 21 is solidified, the formwork 4 is disassembled and the beam 10 is completed.

As described above, in the present embodiment, the mold 4 is formed of a material (bonding material 11) having a higher tensile strength than the concrete 21 and adheres to the concrete 21 due to the deformation of the concrete 21 exceeding a predetermined level. The core part 1 to be cut is disposed along the main reinforcing bar 22 so as to be separated from the inner wall of the mold 4, and then the concrete 21 is placed in the mold 4 with the main reinforcing bar 22 and the core 1. The reinforced concrete beam 10 is manufactured by pouring until it is buried and solidifying.
By doing so, when the stress is applied to the reinforced concrete beam 10, the core and the concrete are not attached to each other. Thereafter, the core is not subjected to the stress, and the reinforced concrete composed of the peripheral concrete and the main reinforcing bar is used. It takes charge of stress in the part. If the stress (deformation) further increases, the reinforced concrete portion begins to break and cannot bear the load, so the proof concrete member's proof strength gradually decreases and the reinforced concrete member is deformed. However, when the deformation of the reinforced concrete member reaches a certain size, the core portion having a high tensile strength is responsible for the load, and the decrease in the proof stress of the reinforced concrete member can be prevented. As a result, it is possible to prevent the displacement of other members joined to the reinforced concrete member from increasing.

In the present embodiment, the core portion is formed by pouring an epoxy resin, a thermosetting resin, or a high toughness cement composite material into a collection of aggregates and solidifying it.
By carrying out like this, the core part can be formed only by arrange | positioning what solidified either of these materials previously to a mold, and filling concrete there.

In this embodiment, the core material, length, cross-sectional dimension, surface roughness, arrangement position, and number of arrangements necessary for the reinforced concrete member to be manufactured to exhibit the desired load displacement characteristics are as follows. One of them is calculated, and a core part is formed and arranged based on the calculation result.
By doing so, the load displacement characteristics of the reinforced concrete member can be optimized for the concrete structure to be constructed, and the concrete structure can be made tougher.
In addition, since the core portion can be formed in a concentrated manner where breakage easily occurs, a reinforced concrete member that is less likely to break can be manufactured.
Furthermore, since it is not necessary to form a core part in the location which is comparatively hard to break, the manufacturing cost of the reinforced concrete structure can be reduced.

<First Embodiment Second Embodiment>
Next, a second embodiment of the first invention will be described.
Here, only differences from the first embodiment will be described, and description of common points will be omitted.

[Structure of reinforced concrete members]
First, the structure of a reinforced concrete beam (hereinafter referred to as beam 10A), which is a reinforced concrete member in the present embodiment, will be described. FIG. 4 is a view showing the beam 10 </ b> A cut out from only a part of the concrete.
As shown in FIG. 4, the beam 10 </ b> A is different from the first embodiment in the structure of the core. 1 A of core parts are the concrete 13, the H-section steel 14 arrange | positioned along the main rebar 22 in the concrete 13, and the Teflon (trademark) sheet | seat 15 which covers the surface of the concrete 13 of 1st Embodiment. It is formed in the same shape as the core part 1. The concrete 13 used for the core part 1A may be the same as the concrete 21 of the RC part 2 or may be different.
The core portion 1A adheres to the concrete 21 of the RC portion 2 to some extent in a state where no stress is applied to the beam 10A, but this attachment is broken by a slight stress.

[Method of manufacturing reinforced concrete members]
Next, a method for manufacturing the beam 10A will be described.
The second embodiment is different from the first embodiment in the core manufacturing process with the change of the core 1A.

(Core manufacturing process S12)
In the core part manufacturing step S12 of this embodiment, first, the H-section steel 14 is separated from the inner surface of the mold 3 in the core mold 3 using a mortar or concrete spacer. Arrange. Then, concrete 13 is poured into the mold 3. Thereafter, the concrete 13 is cured and solidified. When the concrete 13 is solidified, the mold 3 is disassembled and the steel concrete is taken out. And the Teflon sheet | seat 15 is affixed on the whole surface of steel frame concrete. Thus, the core portion 1A is completed.

  As described above, the core portion 1A used in the present embodiment includes the concrete 13 (second concrete), the H-section steel 14 (steel material) disposed along the main rebar 22 in the concrete 13, and the concrete 13. Is formed with a Teflon sheet (covering part) that separates the concrete 21 and the concrete 13 from each other, and, like the beam 10 of the first embodiment, when the deformation reaches a certain size. As a matter of course, the decrease in the yield strength can be prevented, and since the material other than the Teflon sheet 15 is the same as that of ordinary steel concrete, the beam 10A can be manufactured at a lower cost compared to the case of using a resin or the like.

<Second invention>
Hereinafter, an embodiment of the second invention will be described.
The present invention relates to a reinforced concrete member as in the first invention, but the manufacturing method is different from that in the first invention. For this reason, only the points different from the first invention will be described here, and the description of the common points will be omitted.

[Method of manufacturing reinforced concrete members]
First, the manufacturing method of the beam 10B which is a reinforced concrete member of this embodiment is demonstrated. FIG. 5 shows a manufacturing process of the beam 10B.
The beam 10B of the present embodiment is manufactured through a design / formwork manufacturing step S21, an aggregate / rebar arrangement step S22, a concrete filling step S23, and a binder injection step S24. That is, the manufacturing method of the beam 10B of this embodiment is different from the first invention in that the RC portion 2 is formed first and the core portion 1 is formed later.

(Design / Formwork Manufacturing Process S21)
The design / formwork manufacturing step S21 of this embodiment is the same as that of the first invention until the design of the beam 10B, the material, and the preparation of the formwork 4 for the RC part 2, but here the formwork for the core part is used. There is no need to prepare.

(Rebar and aggregate arrangement process S22)
After the material and the mold 4 are prepared, the process proceeds to the reinforcing bar / aggregate arranging step S22. In the reinforcing bar / aggregate arrangement step S22, first, as shown in FIG. 5A, the aggregate 12 is packed into a net-like bag or container that is slightly larger than the core 1 to be formed. In the present embodiment, a gabion 7a (metal cage) is used as an example of a net-like bag or container. And the aggregate 12 (henceforth the aggregate | assembly 7) stuffed in the gabion 7a is arrange | positioned in the formwork 4 as shown in FIG.5 (b), and the reinforcing bars 22 and 23 are assembled. The manner of disposing the assembly 7 is the same as the way of disposing the core portion 1 of the first invention, and the way of assembling the reinforcing bars 22 and 23 is the same as that of the first invention. After the rebars 22 and 23 are assembled, one end of the pipe 8 is inserted into a plurality of locations of the assembly 7 as shown in FIG. The assembly 7 into which the pipe 8 is inserted is a member having a space inside and an opening. The length and insertion position of the pipe 8 are adjusted so that the other end of the pipe 8 can be brought to the upper end of the mold 4 later.

(Concrete filling step S23)
After assembling the reinforcing bars 22 and 23 and disposing the assembly 7, the process proceeds to the concrete filling step S23. In the concrete filling step S23, a predetermined amount of concrete 21 is poured into the mold 4 so that the other end of the pipe 8 is not buried. Then, the aggregate 7 and the reinforcing bars 22 and 23 are buried in the concrete 21, and the upper end portion of the pipe 8 comes out on the concrete 21. At this time, the concrete mortar or cement paste enters the voids in the surface layer portion of the aggregate 7, but their viscosity is so high that they do not reach the central portion of the aggregate 7, and there are voids in the central portion of the aggregate 7. Remain. Further, the gap in the assembly 7 and the outside of the concrete 21 communicate with each other by the pipe 8. Then, the concrete 21 is cured and solidified.

(Binder injection step S24)
After the concrete has solidified, the process proceeds to the binder injection step S24. In the binder injection step S24, as shown in FIG. 5D, the binder 11 is poured from the other end of the pipe 8 coming out from the surface of the concrete 21. In the present embodiment, a container (not shown) containing the binding material 11 is connected to the upper end of the pipe 8, and the container 11 is arranged above the pipe 8, so that the binding material 11 is aggregated by its weight. Slowly fill the gaps. Then, the binder 11 enters the gap in the assembly 7 and the core portion 1 is formed. As described above, the gabion 7a used to form the aggregate 7 is slightly larger than the core 1 to be formed, so that even if cement enters the surface layer of the aggregate 7, it is necessary. A core portion 1B having a size is formed.

As described above, in the present embodiment, the members (aggregate 7 and pipe 8) having a space inside and an opening leading to the space are formed along the main reinforcing bar 22 in the mold 4 and The concrete 21 is disposed so as to be separated from the inner wall of the mold 4, and then the concrete 21 is poured into the mold 4 so as not to close the opening (the upper end of the pipe 8), and then the epoxy resin and the thermosetting resin are opened from the opening. Or a high-toughness cement composite material is injected to fill the space, so that it is formed of a material having a higher tensile strength than concrete in the concrete 21, which is substantially the same as in the first invention. A reinforced concrete member that includes the core portion 1 </ b> B disposed along the line 22 and that can cause the adhesion between the core portion 1 and the concrete 21 to be cut by deformation of the concrete 21 more than a predetermined value can be manufactured.
Further, it is possible to form the core after the concrete structure is constructed with the internal space left, that is, after the outer peripheral portion of the concrete member is formed first.

Further, in the present embodiment, one end of the pipe 8 is inserted into an aggregate 7 formed by collecting a plurality of aggregates so as to have a space inside as a member having a space and an opening. The concrete 21 is poured into the mold 4 so that the other end of the pipe 8 is not buried, and an epoxy resin, a thermosetting resin, or a high toughness cement composite material (binder 11) is inserted from the other end of the pipe 8. ) To fill the remaining space in the aggregate 7 where the concrete 21 has not entered, and when the concrete 21 is poured, the aggregate 12 supports the concrete 21, so the space collapses. Can be prevented.
Moreover, since the usage-amount of these materials is restrained by the part which used the aggregate, the manufacturing cost of a reinforced concrete member can be reduced.
In particular, in the case of an epoxy resin or a thermosetting resin, the shrinkage at the time of solidification becomes a problem, but in this way, the degree of shrinkage of the resin is small compared to the case where the core part is entirely made of resin. As a result, it is possible to prevent a large gap between the concrete and the core portion from deteriorating and the function of handling the load of the core portion after the reinforced concrete portion is destroyed.

  Moreover, in this embodiment, since the aggregate was formed by packing a plurality of aggregates in a net-like bag or container, the aggregate is easily formed as compared with the case where the aggregates are bonded together. be able to.

  Further, in the present embodiment, a container containing an epoxy resin, a thermosetting resin, or a high toughness cement composite material is connected to the opening, the container is disposed above the opening, and an epoxy resin, a thermosetting resin, Or, since the high-toughness cement composite material is injected using its weight, not only a press-fitting device is unnecessary, but it is filled more slowly by being injected slowly at a low pressure. can do.

As mentioned above, although this invention was concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.
For example, although the case where the present invention is applied to a beam has been described in the above embodiment, the present invention may be applied to other reinforced concrete members such as columns, floor slabs, pedestals, and piles of concrete structures.
Moreover, in the said embodiment, although the cross-sectional shape when cut | disconnecting in the direction orthogonal to the extending direction of the main reinforcement 22 of the core part 1 was made into the rectangle, this cross-sectional shape is when a beam is cut | disconnected in the same direction. The cross-sectional shape is preferably similar to the cross-sectional shape. For example, when the cross-sectional shape of the beam is circular, the cross-sectional shape of the core 1 may be circular.
Moreover, in the said embodiment, although the core part 1 was comprised with the coupling | bonding material 11 and the aggregate 12, when the beam 10 is small and the influence to the RC part 2 by the burden increase of cost or shrinkage | contraction of the coupling | bonding material 11 is small. Alternatively, it may be configured without using aggregates. Moreover, you may make it use another binder according to manufacturing conditions (The temperature at the time of solidification, the wetness degree of an aggregate, etc.).
Moreover, in the said embodiment, although H-section steel was used for 1 A of core parts, you may use other steel materials, such as angle iron and a reinforcing bar.
Moreover, in the said embodiment, although the whole surface of the concrete 13 was covered with the Teflon sheet | seat 15, if it is not what is adhering the concrete 21 of the RC part 2 and the concrete 13 of the core part 1A, it will be covered with another material. Anyway. Moreover, you may make it cover only a part instead of the whole.
In the above embodiment, the concrete 21 is poured immediately after the aggregate 7 is placed in the mold 4. However, before the concrete 21 is poured, the aggregate is, for example, sprayed on the surface of the aggregate 7. Alternatively, the process of reducing the gap 7 may be performed in advance.
Moreover, in the said embodiment, although the binding material 11 was inject | poured using the weight (gravity) of the binding material 11, you may make it press-fit using a predetermined apparatus.
In the above embodiment, the voids are formed inside the concrete by aggregates of aggregates. However, a bottomed cylindrical (rectangular or cylindrical) RC portion is formed in advance, and the bone is formed from the opening. The material 11 may be filled and the binder 11 may be injected.
Moreover, although all the said embodiment demonstrated the case where a reinforced concrete member was used as the thing of a precast, the manufacturing method of the 1st, 2nd invention can be applied also when hitting concrete on-site. That is, it is possible to form the RC part form 4 integrally with a formwork such as a pillar at the construction site, hit the beam 10 on the concrete site, and simultaneously form the beam 10 and the other reinforced concrete members such as the pillar.

10, 10A, 10B Reinforced concrete beams (reinforced concrete members)
1, 1A, 1B Core 11 Binding material 12 Aggregate 13 Concrete (second concrete)
14 H-section steel (steel)
15 Teflon sheet (coating part)
2 Reinforced concrete part 21 Concrete 22 Main rebar 23 Shear reinforcement steel bar 4 Formwork for RC part (formwork)
7 Assembly 8 Pipe

Claims (7)

In the mold, in the method of manufacturing a reinforced concrete member in which main reinforcing bars are disposed from one end to the other end of the mold, and then concrete is poured into the mold and solidified.
A core part that is formed of a material having a tensile strength higher than that of the concrete in the mold and is deformed more than a predetermined value after being solidified is formed on the main reinforcing bar. Along and away from the inner wall of the mold,
Then, the concrete is poured into the mold until the main reinforcing bar and the core are buried and solidified.   2. The reinforced concrete member according to claim 1, wherein the core portion is formed by pouring an epoxy resin, a thermosetting resin, or a high toughness cement composite material into a collection of aggregates to solidify the aggregate. Production method. Calculate the core material, length, cross-sectional dimensions, surface roughness, placement position, number of pieces required for the reinforced concrete member to be manufactured to exhibit the desired load displacement characteristics,
The method for manufacturing a reinforced concrete member according to claim 1 or 2, wherein the core portion is formed and disposed based on a calculation result. In the mold, in the method of manufacturing a reinforced concrete member in which main reinforcing bars are disposed from one end to the other end of the mold, and then concrete is poured into the mold and solidified.
In the mold, a member having a space in the interior and provided with an opening leading to the space is disposed along the main reinforcing bar so as to be separated from the inner wall of the mold,
Then, pour concrete into the mold so as not to block the opening,
Thereafter, an epoxy resin, a thermosetting resin, or a high toughness cement composite material is injected from the opening to fill the space. As the member having the space and the space and the opening, a plurality of aggregates are gathered to form an air gap inside, and the one into which one end of the pipe is inserted is used,
Pour the concrete into the mold so that the other end of the pipe is not buried,
Injecting the epoxy resin, the thermosetting resin, or the high-toughness cement composite material from the other end of the pipe, and filling the void in the aggregate without the concrete entering. The manufacturing method of the reinforced concrete member of Claim 4.   The method for producing a reinforced concrete member according to claim 5, wherein the aggregate is formed by packing the plurality of aggregates in a ridge. While connecting the container containing the epoxy resin, the thermosetting resin, or the high toughness cement composite material to the opening, the container is disposed above the opening,
The method for producing a reinforced concrete member according to any one of claims 4 to 6, wherein the epoxy resin, the thermosetting resin, or the high-toughness cement composite material is injected using its weight. .

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