Reinforcement structure

Abstract

To provide a structure or method that allows for reinforcement of beams during post-construction work. [Solution] A reinforcing structure for a reinforced concrete beam member extending in the longitudinal direction, having a first side portion extending in the longitudinal direction and the beam depth direction, a second side portion facing away from the first side portion, and a third side portion extending in a direction intersecting both the second side portion and the first side portion, comprising: a rod-shaped first member arranged outside the first side portion so as to extend in the beam depth direction; a rod-shaped second member arranged outside the second side portion so as to extend vertically, facing the first member with the beam member in between; the third side portion; and connecting members connecting the end of the first member and the end of the second member, respectively.

Description

Technical Field

[0001] The present invention relates to a reinforcement structure.

Background Art

[0002] Conventionally, in the vicinity of an opening provided in a reinforced concrete structure, the reinforced concrete structure has been reinforced (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional method, it is necessary to install reinforcing bars and reinforcing plates before placing concrete and embed them in the concrete structure, and it has not generally been possible to deal with it after the construction of the reinforced concrete structure.

Means for Solving the Problems

[0005] As one embodiment, the present invention provides a reinforcement structure for a reinforced concrete beam member extending in the longitudinal direction, the reinforcement structure including a first side surface portion extending in the longitudinal direction and the beam deflection direction, a second side surface portion facing away from the first side surface portion, and a third side surface portion extending in the longitudinal direction and the width direction, the reinforcement structure including a rod-shaped first member disposed outside the first side surface portion so as to extend in the beam deflection direction, a rod-shaped second member disposed outside the second side surface portion so as to face the first member with the beam member interposed therebetween and extend vertically, the third side surface portion, and a connecting member connecting each of the end portions of the first member and the end portions of the second member.

Effects of the Invention

[0006] According to the present invention, a structure is provided that allows for the reinforcement of beams during post-construction. [Brief explanation of the drawing]

[0007] [Figure 1] (a) A side view of the beam on which the reinforcing structure of the embodiment is installed, and (b) a cross-sectional view taken along the line Ib-Ib in Figure 1(a). [Figure 2] (a) A side view of the beam with the reinforcement structure of the embodiment installed, and (b) a cross-sectional view taken along line IIb-IIb in Figure 1(a), further showing the internal reinforcement. [Figure 3] This shows the structure of the reinforcing structure in the opening of the embodiment, with (a) a cross-sectional view and (b) a side view. [Figure 4] This is a flowchart showing the steps of the embodiment. [Figure 5] (a) is a side view and (b) is a cross-sectional view showing the installation of the reinforcing structure around the opening. [Figure 6] (a) A side view of the beam with the modified reinforcement structure installed, and (b) a cross-sectional view taken along the line VIb-VIb in Figure 6(a). [Figure 7] This is an explanatory diagram illustrating an example of the forces acting around an opening in a beam. [Modes for carrying out the invention]

[0008] Hereinafter, a reinforcing structure 10, which is one embodiment of the reinforcing structure for openings of the present invention, will be described with reference to the drawings.

[0009] Figure 1(a) is a side view of a reinforced concrete beam 20 to which the reinforcing structure 10 of this embodiment is applied, and Figure 1(b) is a cross-sectional view taken along the line Ib-Ib in Figure 1(a). As shown in these figures, the beam 20 has an opening 21 which is a through-hole that penetrates in the width direction, and equipment piping and the like are installed using this opening 21.

[0010] The width direction, beam depth direction, and longitudinal direction of the beam 20 are defined as shown in Figures 1 and 2. Furthermore, the direction of each member is defined and explained based on its state when attached to the beam 20.

[0011] As shown in Figure 1(b), the beam 20 is formed in a rectangular shape in cross-section and has two side portions 20A and 20B extending in the longitudinal and beam depth directions, a bottom portion 20C extending in the longitudinal and width directions at the lower part of the beam 20, and an upper portion 20D extending in the longitudinal and width directions at the upper part of the beam 20. The side portions 20A and 20B are arranged so that they face opposite each other (hereinafter also referred to as "facing each other").

[0012] As shown in Figure 2, shear reinforcement bars 23 and main reinforcement bars 22 are arranged inside the beam 20 and embedded in concrete. The main reinforcement bars 22 are arranged to extend longitudinally in the upper and lower parts of the beam 20. The shear reinforcement bars 23 are arranged to surround the main reinforcement bars 22, and the overall cross-section is roughly rectangular.

[0013] As shown in Figure 2, a portion of the shear reinforcement bars 23 is cut when the opening 21 is formed.

[0014] A reinforced concrete floor slab 30 is fixed to the beam 20. The slab 30 is fixed to the beam 20 so as to be an integral part of it above the side sections 20A and 20B.

[0015] The slab 30 has through-holes 30A that penetrate through the slab 30 in the direction of the beam depth. The upper part of the through-holes 30A is formed to have a larger diameter than the lower part, and is capable of accommodating nuts 16 (described later).

[0016] As shown in Fig. 1, the reinforcement structure 10 of the present embodiment includes an insertion member 11 inserted inside the opening 21, a curing agent 13 injected and cured between the outer peripheral surface of the insertion member 11 and the inner peripheral surface of the opening 21, a sealing 14 which is a filler formed of a polymer resin or the like, two steel bars 15 extending horizontally along the opening 21, and nuts 17 attached to the ends of the steel bars 15.

[0017] As shown in Figs. 1, 2, 3, 5, etc., the insertion member 11 has two members 11A and 11B. The members 11A and 11B have the same shape and each include a steel pipe 111 and a flange portion 112. The steel pipe 111 is a steel member formed in a cylindrical shape and has an end portion 111A and an end portion 111B (Figs. 3, 5(b)). The flange portion 112 is a steel plate formed in a rectangular shape and is fixed to the end portion 111A by welding or the like so that the center of the flange portion 112 is located on the central axis of the steel pipe 111. In the embodiment, the flange portion 112 has a rectangular shape, but it may be in a doughnut shape or an annular shape.

[0018] Two through holes 112A provided above and below the steel pipe 111 in a side view are formed in the flange portions 112 of the members 11A and 11B respectively. Before the injection of the curing agent 13, the through holes 112A form a space connecting the outside air and the opening 21 (hereinafter, also referred to as communicating).

[0019] The curing agent 13 is composed of a material containing cement, such as mortar or grout. Alternatively, an epoxy resin may be used as the curing agent 13. The curing agent 13 is located between the steel pipe 111 and the opening 21 and has a function of transmitting compressive force between the insertion member 11 and the beam 20. Also, the curing agent 13 also enters between the flange portion 112 and the side portions 20A, 20B of the beam 20, but it may be configured such that the curing agent 13 does not enter between the flange portion 112 and the side portions 20A, 20B of the beam 20.

[0020] As shown in Figs. 3 and 5, one steel bar 15 is welded at the welding portion W to the lower outer peripheral surface of the member 11A. The other steel bar 15 is welded at the welding portion W to the upper outer peripheral surface of the member 11B.

[0021] The steel bars 15 are all in contact with both the outer peripheral surface of the steel pipe 111 and the inner peripheral surface of the opening 21, and also have a function as a spacer for adjusting the position of the insertion member 11 with respect to the opening 21. Due to the steel bars 15, the outer peripheral surface of the steel pipe 111 is arranged at a certain interval from the inner peripheral surface of the opening 21. Further, the steel bars 15 also have a function of positioning the steel pipes 111 of the members 11A and 11B and facilitating joining. Note that the steel bars 15 do not necessarily contact the outer peripheral surface of the steel pipe 111 and the inner peripheral surface of the opening 21 entirely, and some play may be provided, such as forming a gap.

[0022] External threads are cut on the ends of the steel bars 15, and the nuts 17 can be fastened thereto. The steel bars 15 do not necessarily need to be made of high-tensile steel, but it is desirable that they be formed of high-tensile steel.

[0023] Each of the steel bars 15 is inserted into the through-hole 112A and extends in the width direction of the beam 20. By fastening the nuts 17 at the ends of the steel bars 15, tension is applied to the steel bars 15. The flange portion 112 is pressed against the side surface of the beam 20 by the steel bars 15 and the nuts 17. Therefore, the maximum static friction force generated via the curing agent 13 between the flange portion 112 and the beam 20 is at a high value. In addition, when a force acts and causes deformation, there is an effect of suppressing the expansion of the member, and the yield strength can be increased. Further, by staggering the upper and lower steel bars 15, there is an effect of enhancing the grout filling property.

[0024] In addition to the above configuration, the reinforcing structure 10 includes bolts 18A arranged to extend in the beam deflection direction on the outer side in the width direction of the side surface portion 20A, bolts 18B arranged to extend in the beam deflection direction on the outer side in the width direction of the side surface portion 20B, a connecting member 19 connected to the lower ends of the bolts 18A and 18B, and nuts 16.

[0025] Bolts 18A and 18B are both fully threaded steel bolts, and are positioned opposite each other in the width direction on either side of the beam 20. Bolts 18A and 18B do not necessarily have to be made of high-tensile steel, but it is preferable that they be made of high-tensile steel. The upper parts of both bolts 18A and 18B are inserted into through holes 30A. Furthermore, the upper ends of bolts 18A and 18B are fixed to the slab 30 by fitting washers and anchoring plates and then tightening nuts 16. Note that bolts 18A and 18B are not limited to fully threaded bolts; bolts with threads only at the ends may also be used.

[0026] It is desirable that bolts 18A and 18B be positioned near the opening 21 or the missing portion of the shear reinforcement 23 in the longitudinal direction. In particular, it is preferable that bolts 18A and 18B be positioned within half the beam depth length from the center of the opening 21 or the missing portion of the shear reinforcement 23 in the longitudinal direction (Figure 7). This is because the beam opening is usually formed in the center of the beam depth, and the angle that the principal stress in the beam 20 makes with respect to the longitudinal direction (or beam depth direction) is approximately 45 degrees. By positioning bolts 18A and 18B in this way, an appropriate reinforcing effect can be obtained for the opening 21 or the missing portion of the shear reinforcement 23.

[0027] The connecting member 19 is a rod-shaped member made of steel C-shaped steel and is arranged to extend in the width direction. Through holes 19A are formed at both ends of the connecting member 19, and bolts 18A and 18B are inserted into them.

[0028] The lower ends of bolts 18A and 18B are fixed to the ends of the connecting member 19 by fastening nuts 16. Furthermore, by fastening nuts 16, the connecting member 19 presses its lower surface portion 20C upward.

[0029] In other words, the connecting member 19 is a member that connects bolts 18A and 18B, and can also be said to be a member that connects the lower surface portion 20C with bolts 18A and 18B.

[0030] Bolts 18A and 18B are placed one on each side in the longitudinal direction of the opening 21. The total amount of reinforcement from the two sets of bolts 18A and 18B placed on both sides of the opening 21 is set to be equal to or greater than the amount of reinforcement from the cut shear reinforcement bars 23.

[0031] Since bolts 18A and 18B are secured to the slab 30 and connecting member 19 by tightening nuts 16 at both their upper and lower ends, they are under tension.

[0032] (Construction) The construction method for the reinforcement structure 10 will be explained below using the flowchart in Figure 4.

[0033] In process S1, the worker drills a core hole in the beam 20 to form an opening 21. At this time, a portion of the shear reinforcement bars 23 is cut.

[0034] Next, the worker inserts members 11A and 11B into the opening 21 from both sides of the beam 20 (S3). The ends 111B of members 11A and 11B abut against each other near the center of the beam 20 in the width direction (Figure 5).

[0035] In process S4, the worker passes the steel rod 15 through the through hole 112A.

[0036] In step S5, the worker seals the gap between members 11A and 11B, that is, between the end 111B, with sealant 14. By sealing the gap, leakage of the hardening agent 13 is prevented in the subsequent step S7.

[0037] In step S7, the worker injects the hardening agent 13. The hardening agent 13 is injected through the gap between member 11A and beam 20, and / or the gap between member 11B and beam 20.

[0038] In step S7, the hardening agent 13 is injected through a through hole 112A (indicated as "injection port" in Figure 3) formed in the lower part of member 11A. The injected hardening agent 13 fills the space between the insertion member 11 and the beam 20, more specifically between the steel pipe 111 and the inner surface of the opening 21. Furthermore, the hardening agent 13 may also be filled between the flange portion 112 and the beam 20. The worker can confirm that the hardening agent 13 has been filled by visually observing that the hardening agent 13 has come out of the through hole 112A formed in the upper part of member 11B.

[0039] In step S8, the worker fastens nuts 17 to the ends of each steel bar 15, applying tension to the steel bars 15. As a result, a pressing force is applied to the flange portion 112 from the steel bars 15 and nuts 17, causing the flange portion 112 to press against the side surface of the beam 20.

[0040] As the hardening agent 13 hardens, the reinforcing structure 10 integrates with the beam 20. The flange portion 112 prevents deformation of the steel pipe 111, and the steel pipe 111 resists the compressive force applied from the outer circumference, thereby functioning as a shear reinforcement around the opening 21.

[0041] In process S9, the worker uses a tool to form through holes 30A in the slab 30 and inserts bolts 18A and 18B. The upper ends of bolts 18A and 18B are attached to the slab 30 by tightening nuts 16.

[0042] In step S11, the connecting member 19 is installed. The lower ends of bolts 18A and 18B are inserted into the through holes 19A of the connecting member 19, and nuts 16 are then tightened. By tightening the nuts 16, the connecting member 19 presses its lower surface 20C upward, and tension is applied to the bolts 18A and 18B.

[0043] <Variation> The connecting member 19 can also be placed on the upper surface portion 20D, as shown in the reinforcement structure 100 in Figure 6 as an example of modification. As shown in the figure, the beam 20 in the example of modification does not have the slab 30 attached to it.

[0044] In this modified example, the connecting member 19 is placed not only on the lower surface 20C but also on the upper surface 20D so as to extend in the width direction. The upper ends of the bolts 18A and 18B are also inserted into the through holes 19A, and washers or fixing plates are fitted on top of them, and nuts 16 are tightened over them. The connecting member 19 placed on the upper surface 20D presses the upper surface 20D downward. Note that the connecting member 19 can also be set on the upper surface of the beam 20 even when the slab 30 is attached to the beam 20.

[0045] With this configuration, bolts 18A and 18B are connected to the upper surface portion 20D via bolts 18A and 18B. Bolts 18A and 18B are fixed to the beam 20 by the connecting member 19. Since bolts 18A and 18B are fixed to the beam 20, the reinforcing structure 100 performs its function of reinforcing the beam 20 in order to resist the shear force acting on the beam 20.

[0046] <Other variations> (1) Opening 1 In the above embodiment, an opening 21 was formed in the beam 20. However, the beam 20 does not need to have an opening or through hole. Also, the shear reinforcement bars 23 do not need to be cut.

[0047] In other words, the reinforcing structure 10 can be constructed even without an opening. In this case, the reinforcing structure 10 can be constructed using only bolts 18A, 18B, connecting members 19, and nuts 16. Since the bolts 18A and 18B resist the shear force generated in the beam 20, they can function as reinforcing members for the shear reinforcement bars 23. Such a configuration can be applied, for example, when an insufficient amount of reinforcement in the shear reinforcement bars 23 is discovered after the construction of the beam 20.

[0048] (2) Opening 2 Even when an opening 21 is formed in the beam 20, the reinforcing structure 10 can be constructed using bolts 18A, 18B, connecting members 19, and nuts 16, without using the inserting member 11, hardening agent 13, sealant 14, or steel rod 15.

[0049] In the above case, instead of the insertion member 11, the opening 21 can be filled with non-shrink mortar to create a structure that resists the compressive force generated in the opening 21 (Figure 7, white dotted arrow). For example, this configuration can be applied when the opening 21 becomes unnecessary after construction. Also, even if the beam 20 has sufficient strength to withstand the compressive force generated around the opening 21 without reinforcing the opening 21, the reinforcing structure 10 can be constructed using only bolts 18A, 18B, connecting members 19, and nuts 16.

[0050] (3) Connecting members The connecting member 19 may be made of a material other than C-shaped steel. For example, angle steel or H-shaped steel can be used as the connecting member 19. It is preferable that the connecting member 19 be made of a material with a large second moment of area relative to its weight and cross-sectional area.

[0051] (4) Insertion member In this embodiment, before attachment to the beam 20, the insertion member 11 was divided into two members 11A and 11B, and consequently, the steel pipe 111 was also divided into two members. During construction, members 11A and 11B were inserted from both sides of the beam 20, and the steel pipe 111 was butted together to form a single cylindrical section. However, the possible configurations are not limited to this, and the steel pipe 111 may be processed as a single member before attachment. For example, a steel pipe 111 having a length approximately the same as the width of the beam 20 may be prepared and inserted into the opening 21.

[0052] (5) Guard Furthermore, the flange portion 112 is not necessarily required if the beam 20 is equipped with sufficient shear reinforcement. Therefore, depending on the circumstances, it is possible to have a configuration in which at least one of the members 11A and 11B does not have a flange portion 112.

[0053] In the drawings of each embodiment, the flange portion 112, whose outer edge is formed in a rectangular shape, may also have an outer edge shape other than a rectangle, such as a circle or an ellipse.

[0054] (6) Bolt The bolts 18A and 18B are not limited to being placed on both sides in the longitudinal direction of the opening 21, but can also be placed on only one side. Even in cases where there is no opening, a configuration in which one bolt 18A and one bolt 18B are placed near the missing portion of the shear reinforcement bar 23 can be considered.

[0055] (7) Inverted beams, etc. The shapes of the beam 20 and slab 30 are not limited to the above embodiments or modifications. For example, in the case of an inverted beam, the slab 30 is attached to the lower side, and the beam-slab connection is such that it is convex upwards (i.e., a shape like Figures 1 and 2 turned upside down), but the reinforcing structures 10 and 100 can still be applied. In this case, the reinforcing structure 10 is installed upside down compared to Figures 1 and 2. That is, nuts 16 are tightened onto the lower ends of bolts 18A and 18B to fix them to the slab 30, and the connecting member 19 is installed on the upper surface of the beam 20. Furthermore, the reinforcing structures 10 and 100 can also be applied when the slab 30 is attached to only one side of the beam 20. One end of bolts 18A and 18B may be fixed to the slab 30, and both ends of the other bolt may be connected to the connecting member 19.

[0056] (8) Fixing the bolts The method of fixing bolts 18A and 18B to slab 30 is not limited to screw connections. For example, a method of fixing the ends of bolts 18A and 18B to slab 30 using mechanical anchors or chemical anchors (registered trademarks) may be employed.

[0057] <Effects> (Aspect 1) The reinforcing structures 10, 100 according to this embodiment are reinforcing structures for a reinforced concrete beam 20 extending in the longitudinal direction, having a side portion 20A (corresponding to a first side portion) extending in the longitudinal direction and the beam depth direction, a side portion 20B (corresponding to a second side portion) facing away from the side portion 20A, and a lower surface portion 20C or upper surface portion 20D (corresponding to a third side portion) extending in the longitudinal direction and the width direction, and comprising a rod-shaped bolt 18A (corresponding to a first member) arranged outside the side portion 20A so as to extend in the beam depth direction, a rod-shaped bolt 18B (corresponding to a second member) arranged outside the side portion 20B so as to face the bolt 18A across the beam 20 and extend in the beam depth direction, a lower surface portion 20C or upper surface portion 20D, and a connecting member 19 that connects the end of the bolt 18A and the end of the bolt 18B, respectively.

[0058] In the above configuration, bolts 18A and 18B exert the same effect as shear reinforcement bars 23, and can resist the shear force generated in the beam 20. Since the connecting members 19, bolts 18A and 18B can be installed after the beam 20 is constructed, the reinforcement structures 10 and 100 can reinforce the beam 20 in a post-construction manner. In addition, bolts 18A and 18B can suppress the expansion of members that occurs when the beam deforms during an earthquake (restraint effect), thereby improving the load-bearing capacity of the opening.

[0059] More specifically, when a shear force is applied to the beam 20, a tensile force acts around the opening 21, spreading radially outward from the opening 21, as shown by the solid white arrow in Figure 7, for example. Since the bolts 18A and 18B resist this force, it is possible to prevent large localized stresses and forces from acting on the reinforced concrete around the opening 21. In this way, the reinforcing structures 10 and 100 exhibit the same effect as shear reinforcement bars. Furthermore, by using connecting members 19 and the like, the reinforcing structures 10 and 100 can reinforce the beam 20 even after its construction.

[0060] (Aspect 2) In aspect 1, the connecting member 19 is arranged to extend in the width direction of the beam 20 on the lower surface portion 20C and has one end connected to the lower end of the bolt 18A and the other end connected to the lower end of the bolt 18B.

[0061] In the above configuration, by arranging the connecting member 19 on the lower surface portion 20C, the reinforcing structures 10 and 100 can be easily installed on the beam 20 with a simple structure.

[0062] (Aspect 3) In aspect 1 or 2, the first end of bolt 18A, which is the end on the slab 30 side, and the second end of bolt 18B, which is the end on the slab 30 side, are fixed to the slab 30 attached to the beam 20.

[0063] (Aspect 4) In any of aspects 1 to 3, bolts 18A and 18B each penetrate the slab 30, and the first upper end and the second upper end are fixed to the slab 30 by fastening nuts 16.

[0064] In the configurations of embodiments 3 and 4 described above, the reinforcing structures 10 and 100 can be easily installed on the beam 20 with a simple structure by arranging the connecting member 19 on the slab 30. Since the connection is made using nuts 16, the bolts 18A and 18B can be firmly fixed to the slab 30.

[0065] (Aspect 5) In any of aspects 1 to 4, the beam 20 has an opening 21 that penetrates the beam 20 in the width direction, and bolts 18A and 18B are arranged in pairs on both sides of the opening 21 in the longitudinal direction.

[0066] In the above configuration, the reinforcing structures 10 and 100 have a high reinforcing effect. By arranging bolts 18A and 18B as in the above configuration, an appropriate reinforcing effect can be obtained against the shear force applied to the opening 21 or the missing portion of the shear reinforcement bar 23.

[0067] (Aspect 6) In any of aspects 1 to 5, the reinforcing structures 10, 100 further include a cylindrical steel pipe 111 (corresponding to a cylindrical portion) inserted into an opening 21 formed in the beam 20, and a hardening agent 13 injected between the outer surface of the steel pipe 111 and the inner surface of the opening 21.

[0068] When shear force is applied to the beam 20, a compressive force acts around the opening 21, crushing it, as shown by the white dotted arrow in Figure 7, for example. When reinforcing structures 10 and 100 are used, the steel pipe 111 bears the compressive force that would normally be borne by the reinforced concrete in the portion of the reinforced concrete beam corresponding to the opening 21 in the case of no opening. This suppresses changes in the stress distribution around the opening 21, thereby preventing large localized stresses and forces from acting on the reinforced concrete around the opening 21.

[0069] (Aspect 7) In any of aspects 1 to 6, bolts 18A and 18B are arranged within a range of half the beam depth from the center near the opening 21.

[0070] The above configuration is due to the fact that the direction in which tensile force acts on the beam 20 is approximately 45 degrees with respect to the longitudinal direction or the beam depth direction (Figure 7). By arranging it in this way, an appropriate reinforcing effect can be obtained against the shear force acting on the opening 21 or the missing portion of the shear reinforcement bars 23.

[0071] (Aspect 8) In any of aspects 1 to 7, the total amount of reinforcement in bolts 18A and 18B is equal to or greater than the amount of reinforcement in the shear reinforcement missing in beam 20.

[0072] In the above configuration, the amount of reinforcing steel needed to compensate for the deficiency in the shear reinforcement bars 23 is compensated for by bolts 18A and 18B, thus providing an appropriate reinforcing effect against the shear force acting on the beam 20.

[0073] (Other effects) The flange portion 112 is pressed against the side surface of the beam 20 by the steel rod 15. A large maximum static friction force is generated between the flange portion 112 and the beam 20, so the tensile force around the opening 21 (Figure 7) is transmitted to the flange portion 112 by friction. At that time, the flange portion 112 generates a reaction force against the tensile force and resists it. Therefore, the reinforcing structure 100 resists not only compressive force but also tensile force, exhibiting a high reinforcing effect. Reinforcing structures 10 and 100 are particularly effective when the amount of shear reinforcement is insufficient around the opening 21 and large compressive and tensile forces are generated around the opening 21. The steel rod 15 has the effect of suppressing member expansion and can increase load-bearing capacity.

[0074] By providing the flange portion 112 and abutting it against the side surface of the beam 20, members 11A and 11B can be installed on the beam 20 in the appropriate position. In addition, the flange portion 112 suppresses deformation of the steel pipe 111 and enhances the reinforcing effect.

[0075] Since the steel rod 15 also functions as a spacer for positioning the steel pipe 111, the installation of the insertion member 11 is easy.

[0076] By interposing the hardening agent 13 between the beam 20 and the flange portion 112, it becomes possible to reliably transmit compressive force from the beam 20 to the steel pipe 111. When cement material or epoxy resin is used for the hardening agent 13, it is possible to create a hardening agent 13 that can withstand high loads and is resistant to deformation. This makes it possible to reliably transmit compressive force from the beam 20 to the steel pipe 111. [Explanation of Symbols]

[0077] 10, 100 Reinforcement structure, 11 Insertion member, 13 Hardening agent, 14 Sealing, 15 Steel rod, 16 Nut, 17 Nut, 18A, 18B Bolt, 19 Connecting member, 20 Beam, 30 Slab

Claims

1. A reinforcing structure for a reinforced concrete beam member extending in the longitudinal direction, having a first side portion extending in the longitudinal direction and the beam depth direction, a second side portion facing away from the first side portion, and a third side portion extending in the longitudinal direction and the width direction, A rod-shaped first member is arranged outside the first side portion so as to extend in the direction of the beam depth, Outside the second side portion, a rod-shaped second member is positioned opposite the first member with the beam member in between, and extending vertically. The third side portion and a connecting member that connects the end of the first member and the end of the second member, Reinforcement structure.

2. The third side portion is the lower surface portion of the beam member, The connecting member is arranged on the lower surface so as to extend in the width direction of the beam member, and has one end connected to the lower end of the first member and the other end connected to the lower end of the second member. The reinforcing structure according to claim 1.

3. The aforementioned beam member has a slab attached to it. The first end of the first member, which is the end on the slab side, and the second end of the second member, which is the end on the slab side, are fixed to the slab. The reinforcing structure according to claim 1 or 2.

4. The first member and the second member each penetrate the slab, and the first upper end and the second upper end are each fixed to the slab by fastening nuts. The reinforcing structure according to claim 3.

5. The beam member has an opening that penetrates the beam member in the width direction, The first member and the second member are arranged in pairs on both sides of the opening in the longitudinal direction. The reinforcing structure according to claim 1.

6. A cylindrical portion is inserted into the opening formed in the beam member, The system further comprises a hardening agent injected between the outer circumferential surface of the cylindrical portion and the inner circumferential surface of the opening. The reinforcing structure according to claim 1.

7. The first member and the second member are arranged in the longitudinal direction within a range of half the beam depth from the center of the opening. The reinforcing structure according to claim 5 or 6.

8. The total amount of reinforcement in the first and second members is equal to or greater than the amount of shear reinforcement missing in the beam member. The reinforcing structure according to claim 1.

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