JP2008231827A - Reinforced concrete block wall body and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a wall body and a fiber sheet share shearing force when the wall body causes shearing deformation, while securing unity of respective concrete blocks, in the concrete block wall body. <P>SOLUTION: The fiber sheet 3 is stuck to at least one surface of the concrete block wall body 2 by an adhesive 3a, and the fiber sheet 3 made to follow the shearing deformation of the wall body 2 as a fiber reinforced sheet 4 integrated with the adhesive 3a. The wall body 2 is restricted in the deformation by its peripheral frame 5 or the ground 6. A steel material 7 straddling between the wall body 2 and the frame 5 is integrated into both the wall body 2 and the frame 5, and the wall body 2 is restricted by the frame 5. The wall body 2 is restricted by a receiving beam 14 constituted between columns 51 and 51 of the frame 5 and integrated into both columns. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforced concrete block wall body that provides shear strength and shear rigidity to a wall body in a situation where, for example, a concrete block wall body is constructed between parallel piers of a railway viaduct, and a construction method thereof. Is.

  Under the condition that a concrete block wall is constructed between the parallel piers as described above, and the space between the opposing walls is used in stores, offices, etc., against the shear failure of the structure including the piers When reinforcement is required, a method of winding up a steel plate, concrete, continuous fiber sheet, etc. around the bridge pier after first dismantling and removing the wall body is often employed.

  In this case, since the use of the space between the walls must be stopped due to the dismantling of the walls, functions such as life and business in the space must be temporarily stopped. Reinforcing work cannot be carried out smoothly in terms of compensation to users and restoration of the current state of facilities. In any case, the method of constructing a new wall body after dismantling the existing wall body does not take advantage of the function of the existing wall body, so it can be said that it is a reasonable method in terms of cost and period. Absent.

  As a method for newly constructing a concrete block wall, a method of stacking blocks while filling an adhesive between adjacent blocks (see Patent Document 1), a limited area inside a fiber reinforced plastic frame There is a method of stacking blocks (see Patent Document 2).

  To construct a new wall body other than a concrete block structure, a precast concrete wall plate is arranged in a pillar / beam frame (see Patent Documents 3 and 4), and steel is made along the inner periphery of the frame. A method of constructing a seismic wall on its inner periphery (see Patent Document 5), a method of adhering a high-strength fiber sheet to the central part of the seismic wall constructed in the frame (see Patent Document 6) There is.

  In addition, after attaching a fiber sheet to the entire surface of the wall and the pillars connected to both sides thereof, a concrete block is arranged on both sides in the thickness direction near the pillar of the wall, and the fiber sheet is restrained (Patent Document) However, there is no method for seismically reinforcing this wall while placing an existing concrete block wall used as a partition wall in use.

JP 2004-44166 A (Claim 1, FIG. 1, FIG. 3, FIG. 4) JP 2004-162469 A (Claim 1, FIG. 1) JP-A-11-324182 (Claim 1, FIG. 1 and FIG. 2) JP 2000-129952 A (Claim 1, FIG. 1, FIG. 2) JP 2001-027048 A (Claim 1, FIGS. 1 to 4) JP-A-10-025905 (Claims 2, 3 and 4) JP 2004-124521 A (Claim 1, FIG. 2, FIG. 4)

  Since Patent Documents 1 to 5 are methods for constructing a new wall, application to the case of improving the shear strength and rigidity of an existing concrete block wall is not effective.

  Patent Document 6 is a method of increasing the deformation capacity of the earthquake-resistant wall and increasing the toughness by arranging the normal-strength concrete around the central part of the high-strength concrete, so that the shear strength of the earthquake-resistant wall cannot be improved. .

  In Patent Document 7, since a fiber sheet is affixed to the entire surface of a wall body and a column connected to the wall body, it is considered that a certain effect can be obtained when applied to a concrete block wall body. However, Patent Document 7 aims to prevent the fiber sheet from peeling even when the concrete structure to be reinforced has a corner, so that it is necessary to stick the fiber sheet around the column. There is a high possibility that it cannot be applied when only a single unit is reinforced. In addition, since the object covers a wider range than when reinforcing a single wall body, the work is restricted.

  In addition to railway viaducts, there are many concrete block walls in production facilities and other existing structures. Unlike existing reinforced concrete walls, existing concrete block walls are sufficiently arranged inside. Since there are often no streaks, individual concrete blocks can behave independently. From this, when reinforcing a concrete block wall using fiber sheets, it is possible to ensure the integrity of each concrete block and share the shear force between the wall and the fiber sheet during shear deformation of the wall. is necessary.

  In view of the above background, the present invention provides a reinforced concrete block wall body capable of sharing a shear force between a wall body and a fiber sheet at the time of shear deformation of the wall body, and imparting shear strength and shear rigidity to the wall body, and a method for constructing the same. This is a proposal.

  The reinforced concrete block wall body of the invention according to claim 1 is a fiber reinforced structure in which a fiber sheet is attached to at least one surface of a concrete block wall body with an adhesive, and the fiber sheet is integrated with the adhesive. It is a constituent requirement to follow the shear deformation of the wall as a sheet. A fiber sheet may be affixed on both surfaces of a wall body.

  The behavior of the fiber sheet as a fiber reinforced sheet integrated with an adhesive means that the fiber sheet exhibits performance as a fiber reinforced plastic (FRP) combined with a resin or the like constituting the adhesive. Therefore, the fiber reinforced sheet has a tensile strength, an elongation rate, and an elastic modulus as performances of the material in which the fiber sheet and the adhesive are synthesized.

  The fiber sheet is bonded to at least one side of the concrete block wall, and the fiber sheet adheres to the concrete block by following the shear deformation of the wall as a fiber reinforced sheet integrated with the adhesive. As long as the state is maintained, the integrity of each concrete block when the wall body undergoes shear deformation is ensured. As a result, when a fracture surface (crack) is about to occur in the concrete block, the fracture surface is dispersed without being concentrated on a part of the wall body due to the crosslinking effect of the fiber sheet (fiber reinforced sheet).

  Also, the shearing force generated on the fracture surface of the concrete block due to the bridging effect of the fiber sheet is transmitted to and borne by the fiber sheet. Therefore, the reinforced concrete block wall to which the fiber sheet is attached is made of concrete block structure. Ensuring shear strength that cannot be obtained with a single wall.

  The fiber sheet has elasticity as a fiber reinforced sheet that is integrated with the adhesive, thereby controlling the shear deformation of the wall body, so that the fiber sheet is neither too high nor too low. By having, the wall body is given shear rigidity that cannot be obtained by the wall body alone. This increase in shear strength and shear stiffness makes it possible to improve the shear strength and shear stiffness of existing structures having concrete block walls.

  The effect of increasing the shear strength and shear rigidity by applying the fiber sheet is also exerted only on one side of the concrete block wall. Therefore, when a concrete block wall is already existing, it is only necessary to reinforce one side of the wall, so that construction can be performed while maintaining functions such as living and sales in the space surrounded by the opposing wall. In addition, it is possible to carry out the reinforcement work without obstructing the flow line or using the flow line.

  Reinforcement work for existing walls can be done by simply sticking the fiber sheet to the wall with adhesive, so dismantling the wall, such as when installing a new wall or adding a reinforcing frame, Since there is no resentment, it is performed without generating noise. For example, when a space is used for a store, office, residence, etc., such as the lower part of a railway viaduct, it is possible to carry out reinforcement work while continuing business and living, that is, leaving the space in use. It is. This is valid for all structures where the existing walls are made of concrete blocks.

  When reinforcing the wall body as a fiber reinforced sheet in which the fiber sheet is integrated with the adhesive, the fiber sheet has a tensile strength within a range where the effect of dispersing cracks generated in the wall body and the effect of increasing the rigidity of the wall body can be exhibited. It is appropriate to have elongation and elastic modulus.

  The higher the tensile strength and elongation of the fiber sheet, the greater the reinforcing effect on the wall body. However, if the elastic modulus is too high, the effect of dispersing the fracture surface generated on the surface of the wall body cannot be expected. If the elastic modulus is too high, the shear deformation of the fiber sheet cannot follow the shear deformation of the wall body alone, so only the fiber reinforced sheet portion in the concrete block that is about to generate the fracture surface bears the shearing force. The sheet may break. As the fiber sheet breaks, the proof stress of the wall body decreases rapidly, and the wall body shows brittle fracture.

  On the other hand, if the elastic modulus of the fiber sheet is too low, the fiber sheet is stretched and deformed at the initial stage of shear deformation occurring in the wall body, which means that only the wall body bears the shearing force acting on the wall body. There is no. For this reason, after the fracture surface is generated in the wall body, and the fracture surface is greatly opened, the fiber sheet that crosslinks the portion exhibits a reinforcing effect, and the fiber sheet stiffens the wall body from the initial stage of deformation. The function to be granted cannot be demonstrated.

Reference 1 (Mayorca Paola, Kimuro Meguro: Seismic retrofitting of masonry structures using polypropylene bands, Proceedings of Annual Conference of Japan Society of Civil Engineers, Vol.58, pp.1077-1078, 2003) Shows an example in which the block wall is reinforced with a polypropylene fiber tape having an elastic modulus of about 1 kN / mm ² , and it has been reported that there is no change in the maximum proof stress regardless of the presence or absence of reinforcement.

In this case, it can be seen that the reinforcement contributes to the point that the block wall reaches the maximum proof stress, and a slight increase in the proof strength is observed during large deformation after the resistance force is rapidly reduced. This means that the elastic modulus (1 kN / mm ² ) is too low. Even if the fiber sheet is highly elastic, the increase in maximum proof stress is small, and the shear deformation angle of the block wall is 1/250 to 1/200, but only up to a shear deformation angle in the range of 1/300 to 1/250. It has been found from documents other than Document 1 that it cannot contribute to yield strength.

  Reference 2 (Hideo Katsumi (Obayashi Institute of Technology Co., Ltd.), Hiroya Hagio, Kozo Kimura, Katsuro Kobuchi: Experimental study on reinforcement of seismic walls using carbon fiber (Part 1 to 2) Pp.327-330, 1996) shows an example of reinforcing a reinforced concrete seismic wall with a carbon fiber sheet. According to the present invention, the method of simply attaching a sheet increases the yield strength by 10%. It is reported that it remains at%. Further, it can be seen that the shear deformation angle at the maximum proof stress stays at about 1/300, and cannot contribute to the shear deformation in the range of 1/250 to 1/200 of the block wall.

From the above, it is considered that the fiber sheet needs to have elasticity that can be deformed following the initial shear deformation of the concrete block wall. That is, the fiber reinforced sheet (fiber reinforced plastic) in which the fiber sheet is integrated with the adhesive has at least an elastic coefficient of 20 kN / mm ² or more, which is an elastic coefficient of general concrete (concrete block construction). It can be said that it is appropriate. On the other hand, in order to ensure followability to the concrete block wall structure as described above, it is also necessary to be in a range not significantly higher than the elastic modulus of concrete.

Here, in order to find the upper limit of the elastic modulus required for the fiber reinforced sheet, a fiber reinforced sheet (vinylon fiber sheet) was prototyped so that the elastic coefficient was 40 kN / mm ^2, and an acrylic resin-based adhesive was used. When the fiber sheet was affixed to a concrete block wall using the above adhesive, a positive and negative alternating loading experiment using the force device shown in FIG. 6 was performed. The result is shown in FIG.

Fig. 7 shows a concrete block wall without reinforcement with fiber sheets (diamond points), a reinforced concrete wall (thick line), and a concrete block wall without underside constraints (dots). Experimental results are also shown. The wall with the fiber reinforced sheet attached is indicated by the point ■. The fiber-reinforced sheet used here has a tensile strength of 950 N / mm ² and an elongation of 2% or more.

  From Fig.7, in the case of no reinforcement, although the shear strength and shear rigidity are low, the proof stress (450kN) is maintained up to a shear deformation angle of about 1/100 (loading point displacement of about 16-20mm). It can be seen that the behavior is rich in mechanical toughness. On the other hand, in the case of the present invention in which the fiber reinforced sheet is added to the wall of the concrete block structure, the proof stress (900 kN) is approximately doubled, although there is no great difference in the deformability from the case without reinforcement. I understand that.

  Further, from the comparison between the case of the present invention and the case where the lower surface of the block is not constrained, the reinforcing effect of the wall according to the present invention is large when the restraint around the wall is large and the unity with the structure is high. For example, when the wall body exists in a state where a low-rigidity member such as soft ground can be in contact with the lower surface, the entire wall body tends to sink as the structure is deformed, so that integrity with the structure is ensured. Therefore, there is a high possibility that the restraining effect cannot be obtained.

  Under the circumstances where the integrity of the structure and the wall is low, the effect of increasing the shear strength of the wall itself is small on the structural characteristics of the entire structure, and the reinforcing effect on the wall is also considered small. Therefore, if the integrity of the structure and the wall body is ensured, the reinforcement effect on the wall body will provide a reinforcement effect on the entire structure, so there is a low-rigidity member such as soft ground directly under the wall body. In this case, it is effective to perform a process for increasing the rigidity of the ground.

  FIG. 8 shows the state of cracks on the wall surface according to the present invention used in the experiment shown in FIG. Under the condition that the concrete block wall is constrained by the pillars on both sides, when the wall is reinforced by simply bonding the fiber sheet, the effect of spreading the cracks is usually reduced after a large fracture surface is generated in the wall. I can't expect. Cracks tend to be concentrated on part of the wall.

  On the other hand, when a fiber sheet is added to the wall with an adhesive that gives a moderate elongation and elastic modulus as a fiber reinforced sheet, a number of fracture surfaces (cracks) are dispersed in each concrete block and joint. It has occurred. From this, the shear force in the wall is transmitted to the peripheral part of the wall by the fiber reinforced sheet that bridges the fracture surface, and the fiber reinforced sheet improves the shear strength and rigidity of the entire wall and the structure including it. It can be seen that it contributes to

  Therefore, in the wall body of the present invention in which a fiber reinforced sheet in which a fiber sheet and an adhesive (resin, etc.) are integrated is bonded, when a crack occurs at a certain location, the fiber reinforced sheet crosslinks the crack. As a result of being able to bear the tensile force that caused the cracks, it is considered that the cracks are dispersed and generated over the entire surface of the wall.

  Dispersion of cracks is an indication that the tensile stress inside the wall is uniform, so the concentration of tensile stress (crack) at a specific location is alleviated and a decrease in yield strength due to local fracture is suppressed. It can be said that an increase in shear strength and shear rigidity is realized. In particular, since uniform tensile stress leads to the formation of a stable compression strut inside the wall, it is effective in increasing the shear strength and shear rigidity of a surface member such as a wall.

  After the fiber reinforced sheet bridges cracks and bears the tensile stress, the adhesion of the fiber reinforced sheet to the wall body does not suddenly break, and the fiber reinforced sheet gradually breaks off, so fiber reinforcement The tensile stress borne by the sheet is not lost brittlely. This is considered to be a factor causing a stable increase in yield strength of the wall.

From the reports in the above-mentioned Literature 1 and Literature 2 and the experimental results shown in FIGS. 7 and 8, the following is estimated. In order to effectively exhibit the effect of dispersing the fracture surface produced by the concrete block and the effect of imparting rigidity to the wall, the tensile strength of the fiber reinforced sheet is about 700 N / mm ² or more, the elongation is about 2% or more, and the elastic modulus is it is appropriate in the 20 kN / mm ² approximately more ~40kN / mm ² about the range.

  As described above, the strength and rigidity of the concrete block wall body against the shearing force increase as the degree of restraint that the wall body itself receives from the periphery increases, and the effect of sticking the fiber reinforced sheet increases. From this, when the restraint from the periphery of the wall body is weak, in conjunction with the application of the fiber reinforced sheet to the wall body, as described in claim 2, the wall body is in its surrounding frame or ground, It is effective to be restrained against deformation. The frame refers to at least one of a column and a beam connected to the wall.

  When the wall body is constrained by the frame, specifically, steel materials such as reinforcing bars, shaped steel, and steel pipes straddling between the wall body and the frame are integrated into both the wall body and the frame as described in claim 3. By doing so, the wall body is restrained by the frame. The method of integrating the steel material to both the wall and the frame is not limited, and there are adhesion, fixing, and the like.

  In the case of claim 3, since the frame around the wall body is integrated with the wall body, the wall body behaves not as a single body but as a wall body with an integrated column or beam. A part of the force is transmitted to the column or beam, and the rigidity of the column or beam is added to the rigidity of the single wall body. As a result, the shear strength and shear rigidity of the wall body are improved compared to the case where the wall body alone bears the shearing force.

  In Claim 3, when there is a clearance between the wall body and the column or the beam, the deformation performance of the wall body is ensured within the range of the clearance. Damage to the wall due to collision with the beam is reduced.

  The wall body is also constrained to the frame by the wall body being constructed between the pillars of the frame as described in claim 4 and constrained by the receiving beam integrated with both the pillars. The receiving beam is constructed immediately below or directly above the wall body, and the wall body is in a state where it can come into contact with the receiving beam, whereby the sheared wall body is constrained by the receiving beam. Also in this case, if there is a clearance between the wall and the receiving beam, the deformation performance of the wall is ensured within the clearance.

  In the case of claim 4, when the wall body is restrained by the receiving beam, a part of the shearing force to be borne by the wall body is transmitted to the receiving beam, and the rigidity of the receiving beam is also added to the wall body. As a result, the shear strength and shear rigidity of the wall body are improved as compared with the case where the wall body alone bears the shearing force as in the case of claim 3.

  When the wall body is constrained by the ground, specifically, as described in claim 5, the wall body is constrained by the ground under which ground improvement has been performed. The ground has strength and rigidity by, for example, agitation and mixing with the ground improvement material, or by ground improvement by inserting a core material or the like, and exhibits the effect of restraining the wall body.

  In the case of claim 5, since the wall body is in a state where it can contact the ground improved immediately below, the sheared wall body is restrained from the ground, so that the shear force to be borne by the wall body is reduced. A part is transmitted to the ground, and the rigidity of the ground is added to the wall. As a result, as in the case of claims 3 and 4, the shear strength and shear rigidity of the wall body are improved as compared with the case where the wall body alone bears the shearing force. If there is a clearance between the wall and the ground, the deformation performance of the wall is ensured within that range.

  In the reinforced concrete block structure according to claim 1, a fiber sheet is attached to at least one surface of a wall made of concrete block as described in claim 6, and the fiber sheet is integrated with the adhesive. This fiber reinforced sheet is completed by integrating the fiber reinforced sheet with the wall body so as to follow the shear deformation of the wall body.

  A reinforced concrete block structure according to a third aspect is the construction method according to the sixth aspect, in which the steel material straddling between the wall body and a frame around the wall body and the peripheral frame is formed in the construction method according to the seventh aspect. It is completed by integrating both of the frames and constraining the wall body against deformation in the frame.

  According to a fourth aspect of the present invention, in the construction method according to the sixth aspect of the present invention, the receiving beam integrated with the two pillars is provided between the pillars of the frame around the wall body. This is completed by constraining the wall body against deformation by the receiving beam.

  The reinforced concrete block structure according to claim 5 is the construction method according to claim 6, wherein ground improvement is performed on the ground below the wall body, and the ground improvement is performed. It is completed by restraining the wall body against deformation on the ground.

  The fiber sheet is affixed to the concrete block wall and follows the shear deformation of the wall as a fiber reinforced sheet integrated with the adhesive. The fracture surface (crack) generated in the concrete block can be dispersed without being concentrated on a part of the wall body.

  In addition, since the shear force generated on the fracture surface of the concrete block is transmitted to and borne by the fiber reinforced sheet by the crosslinking effect of the fiber reinforced sheet, the shear strength that cannot be obtained with a single wall made of concrete block is required. Stiffness can be imparted. By increasing the shear strength and rigidity, it is possible to improve the shear strength and rigidity of an existing structure having a concrete block wall.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows that a fiber sheet 3 is bonded to at least one surface of a concrete block-structured wall body 2 with an adhesive 3a, and the fiber sheet 3 is used as a fiber reinforced sheet 4 integrated with the adhesive 3a for shear deformation of the wall body 2. The longitudinal cross section of the reinforced concrete block wall body (following, reinforcement wall body) 1 which follows is shown. Although FIG. 1 shows the case where the fiber sheet 3 is affixed to the whole surface of one side of the wall body 2, the fiber sheet 3 may be affixed only to a part of one side, or may be affixed to the entire surface of both surfaces.

  As the material of the fiber sheet 3, high-performance fibers such as aramid fiber, carbon fiber, polyethylene fiber, and polypropylene fiber are used. However, the material is not particularly limited as long as it can exhibit a certain performance by being integrated with the adhesive 3a. .

The adhesive 3a becomes a part of the fiber reinforced sheet 4 by being integrated with the fiber sheet 3, and the fiber sheet 3 has an appropriate elongation (about 2% or more) and an elastic modulus (about 20 kN / mm ² or more to 40 kN or more). / Mm ² or less). As the adhesive 3a, an acrylic resin-based, epoxy resin-based, or other resin-based adhesive is mainly used, but there is no particular limitation as long as an appropriate elongation and elastic modulus can be obtained as the fiber reinforced sheet 4.

  Although the present invention is applied to an existing concrete block wall 2 constructed in such a manner as to partition a space between bridge piers facing the strong axis direction of a railway viaduct as shown in FIGS. The target is concrete wall 2 in general. The wall body 2 is not limited to existing ones, and may be newly provided. The wall 2 is composed of only the concrete block 2a as shown in FIG. 1, or when the frame 5 composed of columns 51 or beams 52 is connected to the periphery as shown in FIG. And may be supported by the ground 6.

  2 and 3 show that when the wall body 2 alone is insufficient in the shear strength and shear rigidity of the wall body 2, the fiber sheet 3 is attached to the wall body 2 (the fiber reinforced sheet 4 is added) and the wall body 2. An example in which is bound to the surrounding frame 5 is shown. The wall body 2 is restrained by the frame 5 when the steel material 7 straddling between the wall body 2 and the frame 5 is integrated with both the wall body 2 and the frame 5.

  FIG. 2 particularly shows a steel plate 7 having a width and a cross-sectional shape extending over the wall 2 (reinforcing wall 1) and the column 51 of the frame 5 and having a length that extends over the entire height of the wall 2. The case where the wall body 2 and the column 51 are connected by this steel material 7 is shown. 2- (a) is an enlarged view of the broken line area (b) and a horizontal sectional view thereof (c), the steel material 7 is adhesive 8 or mortar on both the wall body 2 and the column 51, as shown in FIG. And bonded by a filler such as resin mortar.

  In FIG. 2, columns 51 and 51 are located on both sides of the width direction (horizontal direction) of the wall body 2, a beam 52 is connected to the upper end of the wall body 2, and the lower end of the column 51 is constructed below the wall body 2. The example of the existing railway viaduct in which the backfill soil (ground 6) which embeds the footing 53 exists is shown. The ground 6 may be in contact with the bottom surface of the wall body 2 or may be separated.

  FIG. 2 is a method in which both sides in the width direction of the wall body 2 are continuously integrated in the vertical direction with the pillars 51 of the frame 5, which is effective when restraining the vertical deformation of the wall body 2 with respect to the frame 5. . Since the wall body 2 is also in a state where it can be in direct contact with the pillars 51, 51 on both sides or indirectly through the steel material 7, horizontal deformation is also restrained. The reinforcing wall body 1 shown in FIG. 2 is only attached to the existing wall body 2 by bonding the fiber sheet 3 to the wall body 2 and bonding the steel material 7 to the wall body 2 and the column 51 using the adhesive 3a. Since it is completed in the construction, there are advantages that the workability is good and the construction cost can be suppressed.

  In FIG. 2, the wall body 2 is constrained to the frame 5 by integrating the pillars 51, 51 on both sides of the wall body 2, but in order to constrain the wall body 2 from the ground 6 as well. Between the lower end of the wall body 2 and the ground 6, a beam member 9 that can come into contact with the wall body 2 during shear deformation is constructed or constructed. The beam member 9 is made of steel or is made of concrete and is constructed in a state in which a clearance is secured between the lower end of the wall body 2 or in close contact with the lower end of the wall body 2.

  In FIG. 2, the fiber sheet 3 is adhered to the entire surface of the wall body 2 or almost the entire surface mainly by a resin-based adhesive 3 a, and the steel material 7 is overlapped and bonded to the surface of the fiber sheet 3. In FIG. 2C, a clearance is secured between the end of the wall 2 in the width direction and the column 51 in order to reduce damage caused by the wall 2 colliding with the column 51 immediately after the start of shear deformation. However, this clearance may not be available. Since the steel material 7 is bonded to the surface of the wall body 2 and the inner peripheral surface of the column 51, the deformation of the column body 51 starts immediately after the wall body 2 starts to be deformed regardless of the clearance between the wall body 2 and the column 51. Will be restrained.

  FIG. 3 shows an example in which the wall body 2 is restrained by the beam 52 of the frame 5. In order to constrain the entire wall 2 to the beam 52 positioned thereon, a steel member 10 (T-shaped steel) having a T-shaped cross section as a steel material 7 is applied to a concrete block 2a arranged at the lowest stage of the wall 2 here. ) Is fixed, and a bar 11 such as a reinforcing bar or steel bar that reaches the beam 52 from the steel member 10 is started up, and the upper end of the bar 11 is fixed to the beam 52.

  The steel member 10 has a T-shaped cross section from a flange that can come into contact with the wall body 2 and a web through which the bar 11 penetrates, and an anchor 12 that penetrates the flange is fixed to the wall body 2 in the wall body 2. It is fixed by. The steel member 10 is bonded to the wall body 2 by the above-described adhesive 8 or mortar, for example. A through hole is formed in the web of the steel member 10, and the bar 11 penetrates the through hole directly or indirectly through a sleeve or the like. When the wall 2 and the frame 5 are existing, the upper ends of the anchor 12 and the bar 11 are fixed to the wall 2 and the beam 52, respectively, in the manner of a post-installed anchor.

  In FIG. 3, if a threaded steel bar is used as a bar 11 at least in a section sandwiching a through-hole of the web, and nuts 13 are arranged on both sides of the web, the reinforcing wall body 1 depends on the degree of tightening of the nut 13. There is an advantage that the degree of restraint to the beam 52, that is, the rigidity of the reinforcing wall body 1 can be adjusted. The rigidity of the reinforcing wall 1 can be adjusted by adjusting the cross-sectional area of the bar 11.

  In FIG. 3, the wall 2 is suspended from the beam 52 of the frame 5. The steel member 10 is fixed to the lowermost concrete block 2 a, and the bar 11 fixed to the beam 52 is a steel member. 10, the entire wall body 2 is constrained by the beam 52. In this case, when the wall body 2 is to be displaced vertically downward by shear deformation, the lower end portion of the wall body 2 is restrained by the beam 52 and the shear deformation of the entire wall body 2 is restrained. This is effective when restraining the deformation of the body 2 in the vertical direction. If both sides in the width direction of the wall body 2 are in contact with the columns 51, 51, the wall body 2 is also restrained against horizontal deformation.

  Also in FIG. 3, a wall 2 is constructed by constructing or constructing a steel beam or concrete beam 9 that can come into contact with the lower end of the wall 2 and the ground 6 during shear deformation of the wall 2. Is also restrained at the lower end surface, thereby enhancing the effect of restraining the deformation of the wall body 2 in the vertical direction.

  FIG. 4 shows an example in which the wall body 2 is constructed between the columns 51 and 51 of the frame 5 and is restrained by the receiving beam 14 integrated with both the columns 51 and 51. In the case where the wall body 2 is already present, a space is often present between the lower end of the wall body 2 and the ground 6, so that the receiving beam 14 is mainly constructed directly below the lower end of the wall body 2. Since the receiving beam 14 restrains the wall body 2 by preventing or suppressing the settlement of the lower end of the wall body 2 when the wall body 2 undergoes shear deformation, FIG. 4 restrains the deformation of the wall body 2 in the vertical direction. It is effective in the case.

  If there is a space between the upper end of the wall body 2 and the beam 52 of the frame 5, the receiving beam 14 may be constructed immediately above the upper end of the wall body 2. In this case, the wall body 2 is subjected to shear deformation. Restrained against rising. If both sides in the width direction of the wall body 2 are in contact with the columns 51, 51, the wall body 2 is also restrained against horizontal deformation.

  The receiving beam 14 is constructed of cast-in-place concrete, or a beam member made of precast concrete or steel is installed between the columns 51 and 51 and joined to the column 51. In the case of a concrete structure, the main bar 14 a in the receiving beam 14 is fixed to the column 51.

  In FIG. 4, the receiving beam 14 is constructed so as to be placed directly on the ground 6 so as to receive a reaction force from the ground 6 when the receiving beam 14 restrains the wall body 2. Further, since it is assumed that the rigidity of the ground 6 is relatively smaller than the rigidity of the receiving beam 14, the receiving beam 14 is not embedded in the ground 6 when the wall body 2 is restrained, and a sufficient reaction force is obtained from the ground 6. As shown in FIG. 4B, the receiving beam 14 is formed so that the horizontal cross section gradually increases from the lower end side of the wall body 2 to the ground 6 side. In FIG. 4, the receiving beam 14 having a large cross section is arranged on the ground 6 side, and the receiving beam 14 having a small cross section is arranged thereon, but the receiving beam 14 may be constructed in a trapezoidal cross section.

  FIG. 5 shows an example in which the wall body 2 is constrained to the ground 6 to which the ground is improved. The ground 6 increases rigidity (elastic coefficient) and strength by performing some ground improvement, and restrains the wall body 2 when the wall body 2 sinks or is about to sink. There is no limitation on the type of ground improvement, but it is only necessary to apply ground improvement to the surface soil close to the ground surface. Therefore, soil improvement material such as solidification material and surface soil are mainly stirred and mixed to construct soil cement. To be done. A pile or the like that exhibits a certain supporting force is also inserted into the ground 6.

  FIG. 5 is also effective when mainly restraining deformation of the wall body 2 in the vertical direction because the wall body 2 is restrained by the ground 6 when it sinks from its original position. Also in FIG. 5, a steel beam or concrete beam material 9 that can come into contact with the lower end of the wall body 2 and the ground 6 at the time of shear deformation of the wall body 2 is constructed or constructed. The direction deformation restraining effect is enhanced. If both sides in the width direction of the wall body 2 are in contact with the columns 51, 51, the wall body 2 is also restrained against horizontal deformation.

It is the longitudinal cross-sectional view which showed a mode that the fiber sheet was affixed on the one surface whole surface of the wall body made from concrete block with the adhesive agent. (A) is an elevation view showing a reinforcing wall body in which a fiber sheet is attached to the wall body and the wall body is constrained to the surrounding frame, (b) is an enlarged view of a broken line part of (a), ( c) is a horizontal sectional view of (b). (A) is an elevational view showing another reinforcing wall body in which a fiber sheet is attached to the wall body and the wall body is constrained to the surrounding frame, and (b) is a vertical section of a broken line part of (a) FIG. (A) is an elevational view showing a reinforcing wall body which is constructed between the pillars of the frame and is restrained by a receiving beam integrated with both pillars, and (b) is a longitudinal section of the broken line part of (a) FIG. It is the elevation which showed the reinforcement wall body which restrained the wall body to the ground where the ground improvement of the lower part was given. It is an elevational view showing a situation when a positive and negative alternating loading test is carried out on a reinforcing wall body and a non-reinforcing wall body of the present invention. It is the graph which showed the result of the positive / negative alternating loading experiment using the force-applying apparatus shown in FIG. (A) is an elevational view showing the state of occurrence of cracks occurring on one side of the reinforcing wall of the present invention and columns on both sides thereof, and (b) and (c) are respectively generated on the west and south sides of the south column. Elevations showing the state of cracks, (d) and (e) are elevations showing the state of cracks occurring on the north and west sides of the north pillar, respectively.

Explanation of symbols

1 ……… Reinforced concrete block wall (reinforced wall)
2 ……… Wall 2a …… Concrete block 3 ……… Fiber sheet 3a …… Adhesive 4 ……… Fiber reinforced sheet 5 ……… Frame 51 …… Column 52 …… Beam 53 …… Footing 6 ……… Ground 7 ... …… Steel material 8 ... …… Adhesive 9 ......... Beam material 10 ... Steel member 11 ... Bar material 12 ... Anchor 13 ... Nut 14 ... Receiving beam 14a ... Main reinforcement

Claims (9)

  A fiber sheet is attached to at least one surface of a wall made of concrete block with an adhesive, and the fiber sheet follows a shear deformation of the wall as a fiber reinforced sheet integrated with the adhesive. Reinforced concrete block wall.   2. The reinforced concrete block wall according to claim 1, wherein the wall is restrained against deformation by a frame or a ground around the wall.   The reinforced concrete block according to claim 2, wherein a steel material straddling between the wall body and the frame is integrated with both the wall body and the frame, and the wall body is restrained by the frame. Wall building.   3. The reinforced concrete block wall according to claim 2, wherein the wall is constructed between pillars of the frame and is restrained by receiving beams integrated with both pillars.   The reinforced concrete block wall according to claim 2, wherein the wall body is constrained by a ground having a ground improvement below the wall body.   A fiber sheet is attached to at least one side of a concrete block wall with an adhesive, and the fiber sheet is integrated with the wall as a fiber reinforced sheet integrated with the adhesive, and the fiber reinforced sheet is attached to the wall. A method for constructing a reinforced concrete block wall body, characterized by following the shear deformation of the body.   7. The steel material straddling between the wall body and the surrounding frame is integrated in both the wall body and the frame, and the wall body is restrained against deformation by the frame. The construction method of the reinforced concrete block structure body as described.   7. A reinforced concrete according to claim 6, wherein a receiving beam integrated with both the columns is constructed between the columns of the frame around the wall, and the wall is restrained against deformation by the receiving beam. Construction method of block wall. The reinforced concrete block wall body according to claim 6, wherein ground improvement is performed on the ground below the wall body, and the wall body is restrained against deformation by the ground improved ground. Construction method.

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