JP4639380B2 - Reinforcement method for columns with sleeve walls - Google Patents

Description

  The present invention relates to a method for reinforcing a column with sleeve walls.

  Various methods have been known for reinforcing concrete structures using reinforcing bars, and the methods described in Patent Documents 1 and 2 are also known as “reinforcing methods for concrete walls, etc.” Examples of the “reinforcement method of the column main body of the column” include those described in Patent Document 3. The thing of patent document 4 is known as welding for integrating reinforcing bars mutually.

JP 2003-35041 A JP 2001-32532 A JP2003-120042 JP 2002-285678 A

  It is an object of the present invention to provide a novel “reinforcing method for a column with sleeve walls” that has not been provided conventionally.

The method for reinforcing a column with a sleeve wall according to the present invention is a “reinforcing method for reinforcing a column with a sleeve wall in which one or more sleeve walls are formed on a column body that is a rectangular column having a rectangular cross-sectional shape ”.
The reinforcing method according to claim 1 has the following characteristics.

That is, first, N (≧ 2) through-holes are drilled in the “portion close to the column main body” of each sleeve wall so as to be arranged in the vertical direction.
Reinforcing bars are used as “reinforcing bars”.
N groups of “reinforcing bar groups including two or more reinforcing bars as one set” are prepared, and one group of reinforcing bars is assigned to each of the N through holes.

  And, the reinforcing bars of each group are “pierced by the one or more reinforcing bars so that the main bars are restrained by surrounding the column main body at the position of the corresponding through-hole height”, and N groups of reinforcing bars are arranged so that the free ends of the reinforcing bars overlap each other.

Thereafter, a layer of polymer cement mortar is formed so as to “paint” the N group reinforcing bars, and the N group reinforcing bars are fixed to the column main body.
In addition, the reinforcing bars are installed two-dimensionally on the wall surface of the sleeve wall, which is substantially the same surface as the column surface, and the reinforcing bar members integrated by welding with all-strength type reinforcing bar joint welding are installed, This reinforcing bar member is coated with a polymer cement mortar layer for a sleeve wall portion made of polymer cement mortar, and fixed to the sleeve wall.

As described above, the shape of the column main body is “a quadrangular column having a rectangular cross section” . In addition, the column body has one or more “sleeve walls”. When there is one sleeve wall, or when two sleeve walls are on both sides of the column body with the column body in the middle, the column body is a corner portion. as in the case of constituting the, or when the "two orthogonal wing walls together" is formed on the pillar main body are conceivable.

  The number of reinforcing bar groups: N is appropriately determined depending on the length of the column body of the column with sleeve walls to be reinforced. For example, “the length in the column body: one group per 10 cm” or the like. In this case, if the length of the column body is 200 cm, “reinforcing bar groups” of N = 19 to 20 are used.

  “A layer of polymer cement mortar” is formed to “apply” N group reinforcements, while “a layer of polymer cement mortar can apply N group reinforcements” It means “a state where N group reinforcing bars do not appear” on the surface of the cement mortar layer. The so-called “cover thickness” of the layer of the polymer cement mortar layer at this time is preferably 10 to 30 mm, and the total thickness of the layer is preferably about 30 mm to 100 mm. It is also possible to reduce the “thickness” to about 6 to 8 mm.

  “The layer of polymer cement mortar fixes the N group reinforcement to the column body.” The layer of polymer cement mortar integrates the N group reinforcement with the column body, in other words, the polymer. This means that the cement mortar layer, the N group reinforcement and the column body are integrated. The polymer cement mortar has extremely strong adhesion to reinforcing bars and "concaves with skirted walls". Before applying the reinforcing bar, the reinforcing bar may be fixed to the column body with a primer, but the reinforcing bar is firmly fixed to the concrete of the column with sleeve walls by polymer cement mortar without using a primer. can do.

  The method of reinforcing a column with a sleeve wall according to claim 1 has a configuration of “filling each through hole with polymer cement mortar” prior to forming a layer of polymer cement mortar so that N group reinforcing bars can be applied. (Claim 2).

  The method for reinforcing a column with a sleeve wall according to claim 1 or 2 is as follows: “The column main body has two or more sleeve walls, and at least one of the two or more sleeve walls has a through hole penetrated by a plurality of reinforcing bars. Can be configured (claim 3).

4. The reinforcing method for a column with sleeve walls according to claim 1, 2 or 3 , wherein the reinforcing bars are vertically reinforced by reinforcing bars whose longitudinal direction is the longitudinal direction, together with a plurality of reinforcing bars arranged in the vertical direction with respect to the column main body. One or more bars are provided, the reinforcing bars and the longitudinal reinforcing bars are welded by full-strength reinforcing bar joint welding, and the welded reinforcing bars and the vertical reinforcing bars are coated with a layer of polymer cement mortar on the column body. It can be fixed (claim 4).
As described above, the “ vertical reinforcing bar” has the “vertical direction as the longitudinal direction”. In this case, the “vertical direction” includes not only the vertical direction but also the “direction inclined obliquely with respect to the vertical direction”.

As described above, the column with a sleeve wall is “a column main body is a quadrangular column having a rectangular cross-sectional shape, and one or more sleeve walls are formed” .

In the first aspect of the present invention, as described above , the "reinforcing bar member integrated by welding with two-dimensional reinforcing bar joints and welding by full-strength reinforcing bar joint welding" is installed on the wall surface of the sleeve wall. Then, this reinforcing bar member is coated with a polymer cement mortar layer for a sleeve wall portion made of polymer cement mortar and fixed to the sleeve wall.
At this time, a portion where the sleeve wall surface is exposed in a slit shape is left between the sleeve wall polymer cement mortar layer and the polymer cement mortar layer formed on the column body.
Then, a “pseudo slit portion having a low shear strength” is formed by the “sleeve wall surface portion exposed in a slit shape” and the “polymer cement mortar layer sandwiching this portion” .
This “pseudo slit part with low shear strength” has the exposed part of the sleeve wall surface as the bottom, and both sides of this bottom part are polymer cement mortar layers (polymer cement mortar layer formed on the pillar body, sleeves) It is a slit-like recess sandwiched between sleeve wall polymer cement mortar layers formed on the wall surface.

  The two-dimensional combination of reinforcing bars in the “reinforcing bar member integrated by combining two-dimensional reinforcing bars” is, for example, “a plurality of reinforcing bars parallel in the vertical direction and arranged in parallel to each other in the lateral direction. `` Connected and integrated with reinforcing bars '', `` Integrated by combining multiple reinforcing bars in a vertical lattice shape where the reinforcing bars are parallel in the vertical direction or horizontal direction '', `` Multiple reinforcing bars, A combination of multiple reinforcing bars tilted with respect to the vertical direction combined into a slanted lattice that is combined in a grid pattern, or a combination of diagonal reinforcing bars combined with the top and bottom grid-shaped reinforcing bar arrangements Etc. can be mentioned as examples. Of course, it is not limited to these, and “other two-dimensional combinations” may be used.

Reinforcing bars are used as the reinforcing bars and the vertical reinforcing bars, but the “reinforcing bars” of D6 (diameter: 6 mm) to D22 (diameter: 22 mm) are suitable, and in particular, D6, D10, D13, D16, etc. Reinforcing bars are preferred.

6. The “reinforcing method” according to claim 5 , wherein the column with a sleeve wall to be reinforced includes “a quadrangular column having a rectangular cross-sectional shape as a column body, and one or more sleeve walls so as to be substantially flush with the column surface. Is formed "and is characterized by the following points.

In other words, the “reinforcing bar member that is integrated by two-dimensionally combining reinforcing bars in a two-dimensional manner by full-strength reinforcing bar joint welding” is brought into contact with the “column surface that is flush with the sleeve wall” of the column main body and the sleeve wall. Each reinforcing bar member is applied with a `` polymer cement mortar layer '' and fixed on the column surface and sleeve wall, and is formed on the polymer cement mortar layer formed on the column surface and the sleeve wall. Between the polymer cement mortar layers to be formed, “a portion where the sleeve wall surface is exposed in a slit shape” is formed.
As a result, the thickness of the layer of polymer cement mortar (the polymer cement mortar layer formed on the column surface and the polymer cement mortar layer formed on the sleeve wall) sandwiching this portion is defined as the bottom portion exposed in a slit shape. As a depth, a “pseudo slit portion having a weak shear strength” is formed .

"Reinforcement member" similar to the reinforcement member in the first aspect is "the reinforcement formed by integrating a combination two-dimensionally", two-dimensionally set combined are reinforcement is "rebar", " They are integrated with each other by “full-strength rebar joint welding”

“Full-strength type reinforcing steel joint welding” is a known joint welding described in Patent Document 4, in which the weld strength of the welded portion is “more than the standard yield point strength of reinforcing steel”. When a reinforcing bar member is configured by “reinforcement joining by full strength type reinforcing bar joint welding”, even if an external force acts on the reinforcing bar member, the welded part of the reinforcing bar “holds until the reinforcing bar itself yields”, so the reinforcing bar member As the maximum strength can be demonstrated.

  Various types of polymer cement mortars have been known in the past. However, as described in Patent Document 1, “a composite polymer emulsion mainly composed of an acrylate ester copolymer and silicon oxide, calcium oxide, and iron oxide are mainly used. A main material as a component, or a mixture of mortar mainly composed of cement and sand (the mixing ratio of the composite polymer emulsion and the main material or mortar is preferably 1: 3 to 10) ", A material using ZnO as a cross-linking material and glycine which is one of amino acids and contained in a large amount of animal protein as an auxiliary material can be suitably used.

  Such polymer cement mortar has “high toughness” because it has flexibility with extremely high adhesive strength, tensile strength, bending strength, water resistance and fatigue resistance to concrete, and also has a normal shear strength. It is about 1.5 to 2 times that of concrete and has sufficient strength and durability even if it is thin. Therefore, for example, the “cover thickness” for the reinforcing bars can be “thinned to about 6 to 8 mm”.

  Further, when the reinforcing bars are fixed to the “post with sleeve wall” to be reinforced, the reinforcing bars for integrating the reinforcing bars with the concrete are not necessary. Even if the column main body or the sleeve wall is displaced / deformed, the displacement / deformation follows the displacement / deformation, so that the reinforcing portion does not crack, peel off or collapse.

  The polymer cement mortar as described above has a neutralization depth of about 1/5 of that of ordinary concrete and has a high rust prevention function. Therefore, deterioration of the reinforcing bars to be coated due to rust can be prevented.

  As described above, according to the present invention, a novel “reinforcing method for a column with sleeve walls” which is not conventional can be realized.

Embodiments of the invention will be described below.
FIG. 1 is a diagram for explaining reinforcement of a column main body .
A column 10 with a sleeve wall shown in FIG. 1A has a column main body 10A having two sleeve walls 12A and 12B, and the figure shows an “end face shape that can be placed on a horizontal section”. The column 10 with the sleeve wall is “the cross-sectional shape of the column main body 10A is a rectangular shape”, and the column main body 10A has a quadrangular column shape. Speaking of a general case, if the column surface length in the left-right direction of the column main body 10A (so-called “column column”) is D, the “length in the left-right direction in the figure” of each of the sleeve walls 12A, 12B is 2D˜. It is about 3D (in the figure, the lengths of the sleeve walls 12A and 12B are drawn short). Such a column 10 with a sleeve wall is "general as a column with a sleeve wall".

  FIG. 1B shows a state in which through-holes are formed so as to be arranged in the vertical direction in the portions of the pillars with sleeve walls that are close to the pillar main body 10A of the sleeve walls 12A and 12B. That is, the sleeve wall 12A has through holes H1A, H2A,..., HiA,... HNA, and the sleeve wall 12B has through holes H1B, H2B,. Has been. In the left and right sleeve walls 12A and 12B, the through holes HiA and HiB (i = 1 to N) correspond to each other, and the corresponding through holes HiA and HiB form a “pair” and are drilled at substantially the same height. Is done.

FIG. 1C shows a set of reinforcing bars K1, K2 forming a group of reinforcing bars. The reinforcing bars K1 and K2 are “bar shapes bent in a U-shape” and are formed by bending reinforcing bars . The cross-sectional shape of the reinforcing bar can be circular, elliptical, rectangular, or the like. In this embodiment, it is a reinforcing bar (D10) having a circular cross section.

  The through holes HiA and HiB are “usually circular” and are generally formed to have a diameter 2.5 to 3 times the thickness of the reinforcing bars K1 and K2. The through holes HiA and HiB are formed at intervals of 10 to 20 cm in the vertical direction. Therefore, the number N of these through holes HiA and HiB is determined by the hole diameter and arrangement interval of the through holes and the height of the column main body. In this example, the hole system of the through holes HiA and HiB is 25 mm, and the arrangement pitch of the through holes in the vertical direction is 150 mm.

  FIG. 1D shows a state in which U-shaped reinforcing bars K11, K12,..., K1i,..., K1N are provided in each pair of through holes HiA and HiB. The reinforcing bar K1i (i = 1 to N) is the same as the reinforcing bar K1 shown in FIG. The reinforcing bars K1i are provided so that the bent portions on both sides of the U-shape are inserted and penetrated into the through holes HiA and HiB, respectively, and the “portion between the bent portions” is along the column surface of the column main body 10A. Reinforcing bars K2i (i = 1 to N) constituting a “reinforcing bar group” in combination with the reinforcing bars K1i are the same as the reinforcing bars K2 shown in FIG. In the same through-holes HiA and HiB where the reinforcing bars K1i constituting the same group are provided, “U-shaped bent portions on both sides” are inserted through the column main body 10A from the side opposite to the reinforcing bars K1i. Arranged.

  FIG. 1 (e) shows a state in which reinforcing bars K1i and K2i forming one group of reinforcing bars are provided so as to surround the column main body 10A. The free ends of the reinforcing bars K1i and K2i (the free ends at the ends of the bent portions on both sides of the U-shape) penetrate the corresponding through-holes, and the through-hole portions (see FIG. 1 (e)). The portions indicated by f1 and f2) overlap each other.

  In FIGS. 1C and 1E, the reinforcing bars K1 and K2 have “sizes different in the left-right direction”. In FIG. 1E, the free end of the reinforcing bar K1i and the free end of the reinforcing bar K2i The end portions are drawn so as to be “shifted and overlapped in the left-right direction”, but this is for easy understanding of the drawing, and the reinforcing bars K1i and K2i do not necessarily have to have different sizes. It is the same shape, Comprising: Free ends may mutually shift | deviate and overlap in the up-down direction (direction orthogonal to drawing in FIG.1 (e)).

  In FIG. 1E, since “main bars (not shown)” in the column main body 10A are arranged in a direction orthogonal to the drawing, N groups of “reinforcing bar groups” by the reinforcing bars K1i and K2i are represented. The main bars are restrained by surrounding the column main body at the height of the corresponding through holes HiA and HiB.

In this way, after the N group reinforcing bars are disposed, the portions of the through holes HiA and HiB are filled with polymer cement mortar.
FIG. 1 (f) is an enlarged view of the portion indicated by reference numeral f 1 in FIG. 1 (e), and reference numeral 13 H indicates “polymer cement mortar filled in the through hole HiA” in an explanatory manner. The same applies to the portion indicated by reference numeral f2 in FIG. 1 (e), and the polymer cement mortar is similarly filled in the through hole HiB. In this way, the polymer cement mortar filled in the through holes HiA and HiB is solidified, so that the “overlapping parts of the free ends” of the reinforcing bars K1i and K2i that constrain the main bars in a group are connected and fixed together. To do.

After arranging “N groups of reinforcing bars” on the column main body 10A in this way, a layer of polymer cement mortar is formed so that the reinforcing bars K1i and K2i (i = 1 to N) of these N groups can be applied. To do.
FIG. 1G shows a state in which a layer 15 of polymer cement mortar is formed and N groups of reinforcing bars K1i and K2i (i = 1 to N) are applied and fixed to the column main body 10A.

The “reinforcement method” described above is a reinforcement method for reinforcing the column 10 with a sleeve wall having one or more sleeve walls, and N (≧ 2) is provided in a portion adjacent to the column main body 10A of each of the sleeve walls 12A and 12B. ) The through holes H1A, H2A, ... HiA, ... HNA, H1B, H2B, ... HiB, ... HNB are drilled so as to be arranged in the vertical direction, and two or more reinforcing bars K1i, K2i are 1 N groups of reinforcing bars to be included as a set are prepared, and one group of reinforcing bars is allocated to each of the holes HiA and HiB of the N through holes, and the reinforcing bars K1i and K2i of each group correspond to the corresponding through holes. The column main body 10A is surrounded at the position of the height of H1i and H2i so as to restrain the main muscle, and the corresponding through holes HiA and HiB are penetrated by one or more reinforcing bars K1i and K2i, so that the reinforcing bars are free from each other. The edges overlap each other A manner, provided with reinforcing muscle of N group, to form a layer 15 of a polymer cement mortar to put painted Reinforcement N group, a method for fixing a pillar main body 10A of the reinforcement of the N group.

Prior to forming the polymer cement mortar layer 15 so that the N groups of reinforcing bars K1i and K2i (i = 1 to N) can be applied, the through holes are filled with the polymer cement mortar 13H. Further, the column main body 10 has two sleeve walls 12A and 12B, and the through holes HiA and HiB (i = 1 to N) of the two sleeve walls 12A and 12B are penetrated by a plurality of reinforcing bars K1i and K2i. Is done.

The column main body 10A is a “quadrilateral column having a rectangular cross section”, and the one or more sleeve walls 12A and 12B are formed in “substantially the central portion of the column surface” .

FIG. 2 shows a modification of the embodiment of FIG. In order to avoid complications, the same reference numerals as those in FIG.
In this embodiment, vertical reinforcing bars TK11 and TK12 whose longitudinal direction is the longitudinal direction are provided to reinforcing bars K1i (i = 1 to N) provided on the same column surface side of the column main body 10A, and the reinforcing bars K2i (i = the vertical direction with respect to the 1 to N) is provided a longitudinal reinforcement TK21, TK22 whose longitudinal direction (FIG. 2 (a), the are as characterized (b)) points.

In this embodiment , the vertical reinforcing bars TK11, TK12, TK21, and TK22 are the same reinforcing bars as the reinforcing bars K1i and K2i. The reinforcing bars and the reinforcing bars are fixed to each other by “welding”. By reinforcing and integrating the reinforcing bars with the vertical reinforcing bars, the strength of the reinforcing bars as a whole can be increased. The welding between the longitudinal reinforcing bars and the reinforcing bars at this time is “full-strength reinforcing bar joint welding” .

  The vertical reinforcing bars may be welded and fixed to the reinforcing bars K1i and K2i after being attached to the column main body 10A. Alternatively, the vertical reinforcing bars may be in a state that “the reinforcing bar and the vertical reinforcing bar are integrally welded”. May be prepared and assembled to the column main body 10A.

  In FIG. 1 and FIG. 2, “a case where two sleeve walls are formed at substantially the central part of the column surface” has been described as a typical example of a column with a sleeve wall to be reinforced. FIG. 3 illustrates an example of a reinforcing method when the number of sleeve walls is one, three, or four, and when the original cross-sectional shape of the pillar is a circular shape.

  FIGS. 3A, 3B, and 3C show the case of “one sleeve wall”. In these drawings, reference numeral 100A denotes a pillar body, reference numeral 120 denotes a sleeve wall, reference numerals K11 to K18 denote reinforcing bars, Reference numeral 150 denotes a “layer of polymer cement mortar”.

  In the example of FIGS. 3A to 3C, the column with a sleeve wall is “a quadratic column with a column main body 100 </ b> A having a rectangular cross section”, and one sleeve wall 120 is formed at “substantially the center of the column surface”. Has been. N (≧ 2) through holes are formed in a portion of the sleeve wall 120 adjacent to the column main body so as to be arranged in the vertical direction (direction orthogonal to the drawing). In FIG. 3, the through hole itself is not shown.

  In the example of FIG. 3A, two reinforcing bars K11 and K12 form a “reinforcing bar group”. A group of reinforcing bars having a set of reinforcing bars K11 and K12 surrounds the column main body 100A so as to restrain the main bars (arranged in the column main body 100A in a direction perpendicular to the drawing). And each through-hole is penetrated by two reinforcement bars, and it arrange | positions in the direction orthogonal to drawing so that the free end part of reinforcement bars may mutually overlap.

  The through hole is penetrated by reinforcing bars K11 and K12 and filled with polymer cement mortar. Further, the “portions that overlap at the portion of the column surface opposite to the column surface on which the sleeve wall 120 is formed” in the column main body 100A are fixed and integrated with each other by a joint method such as a lap joint or welding. The layer 150 of the polymer cement mortar is formed so as to be able to apply the N group reinforcing bars arranged as described above, and fixes the N group reinforcing bars to the column body.

  In the example of FIG. 3B, the three reinforcing bars K13, K14, and K15 constitute one set to form a “reinforcing bar group”. A group of reinforcing bars including the reinforcing bars K13, K14, and K15 as a set surrounds the column main body 100A to restrain the main bars, and each through hole is penetrated by the two reinforcing bars K13 and K14. The reinforcing bars are arranged in a direction perpendicular to the drawing so that the free ends of the reinforcing bars overlap each other.

  Each through hole is penetrated by reinforcing bars K13 and K14 and filled with polymer cement mortar. Further, in the overlapping portions of the reinforcing bars K13, K14, and K15 (in portions other than the through holes), these reinforcing bars are fixed and integrated with each other by “a joint method such as a lap joint or welding”. The layer 150 of the polymer cement mortar is formed so as to be able to apply the N group reinforcing bars arranged as described above, and fixes the N group reinforcing bars to the column body.

  In the example of FIG. 3C, the three reinforcing bars K16, K17, and K18 constitute a set and constitute a “reinforcing bar group”. A group of reinforcing bars including the reinforcing bars K16, K17, and K18 as a set surrounds the column main body 100A and restrains the main bars, and each through hole is penetrated by the two reinforcing bars K16 and K17. The reinforcing bars are arranged in a direction perpendicular to the drawing so that the free ends of the reinforcing bars overlap each other.

  The through hole is penetrated by reinforcing bars K16 and K17 and filled with polymer cement mortar. In the portions where the reinforcing bars K16 and K18 and the reinforcing bars K17 and K18 overlap each other, these reinforcing bars are fixedly integrated with each other by “a joint method such as a lap joint or welding”. The layer 150 of the polymer cement mortar is formed so as to be able to apply the N group reinforcing bars arranged as described above, and fixes the N group reinforcing bars to the column body.

In the example shown in FIG. 3D, the column with a sleeve wall is an example in which three sleeve walls 120, 121, 122 are formed on the column main body 100A. Each of the sleeve walls 120, 121, and 122 is formed with N (≧ 2) through holes arranged in a vertical direction (a direction orthogonal to the drawing) in a portion adjacent to the column main body 100A.
In this example, the reinforcing bars K19, K20, and K21 constitute a “reinforcing bar group” as a set, and such reinforcing bar groups are arranged in the N group in the vertical direction in the column body 100A. Reinforcing bars K19, K20, and K21 constituting one group of reinforcing bars are orthogonal to the drawing so as to surround the column main body 100A and restrain the main bars so that the free ends of the reinforcing bars overlap each other. Placed in the direction. Each through hole of the sleeve walls 120 and 122 is penetrated by a reinforcing bar K19, and these through holes are filled with polymer cement mortar.

  Each through hole of the sleeve wall 121 is penetrated by reinforcing bars K20 and K21 and filled with polymer cement mortar. The overlapping portions of the reinforcing bar K19 and the reinforcing bar K20, and the reinforcing bar K19 and the reinforcing bar K21 are integrated and fixed to each other by a “joint method such as a lap joint or welding”.

  The polymer cement mortar layers 151, 152, and 153 are formed so as to apply the N group reinforcing bars arranged as described above, and fix the N group reinforcing bars to the column body.

In the example shown in FIG. 3E, the column with a sleeve wall is an example in which four sleeve walls 120, 121, 122, 123 are formed on the column main body 100A. Each sleeve wall 120, 121, 122, 123 is drilled so that N (≧ 2) through holes are arranged in a vertical direction (a direction orthogonal to the drawing) in a portion close to the column main body 100 </ b> A. .
In this example, the reinforcing bars K23, K24, K25, and K26 constitute a “reinforcing bar group” as a set, and such reinforcing bar groups are arranged on the column main body 100A in the N group in the vertical direction. The Reinforcing bars K23, K24, K25, and K26 constituting one group of reinforcing bars surround the column main body 100A to restrain the main bars, and the free ends of the reinforcing bars overlap each other so as to be orthogonal to the drawing. It is arranged in the direction to do. The through holes of the sleeve walls 120, 121, 122, 123 are respectively penetrated by reinforcing bars K23, K24, K25, K26, and these through holes are filled with polymer cement mortar.

  The overlapping part of the reinforcing bars K23 and K24, the overlapping part of the reinforcing bars K24 and K25, the overlapping part of the reinforcing bars K25 and K26, and the overlapping part of the reinforcing bars K26 and K23 are mutually connected by the “joint method such as lap joint or welding”. Integrated and fixed.

  The polymer cement mortar layers 154, 155, 156, and 157 are formed so as to apply the N-group reinforcing bars arranged as described above, and fix the N-group reinforcing bars to the column body.

  In the above description, full-strength type rebar joint welding is also suitable as welding as a joint method for joining overlapping portions of reinforcing bars.

FIG. 3F shows an example in which a column main body 130A having a circular cross section has two sleeve walls 140 and 141. FIG.
Two reinforcing bars K27 and K28 each having a semicircular arc shape are formed so that N (≧ 2) through holes are arranged in the vertical direction in a portion of each sleeve wall 140 and 141 adjacent to the column main body 130A. N groups are used as a group of reinforcing bars including a pair.

  One group of reinforcing bars (reinforcing bars K27, K28) is assigned to each of the N through holes of the sleeve walls 140, 141 in correspondence with each other. The reinforcing bars of each of these groups surround the column main body 130A at the height of the corresponding through hole and restrain the main bar, and the corresponding through hole is penetrated by the two reinforcing bars. It arrange | positions with respect to the pillar main body 130A so that a mutual free end part may mutually overlap. Each through hole penetrated by the reinforcing bars K27 and K28 is filled with polymer cement mortar. Then, layers 158 and 159 of polymer cement mortar are formed so as to apply the N group reinforcing bars, and the N group reinforcing bars are fixed to the column main body.

In the example shown in FIGS. 3D and 3F, the column main bodies 100A and 130A have two or more sleeve walls, and at least one of the two or more sleeve walls has a plurality of reinforcing bars. Penetrated .

In these various examples shown in FIG. 3 as well, a plurality of reinforcing bars arranged in the vertical direction as in the embodiment shown in FIG. It is not to say that you can.

FIG. 4 illustrates one embodiment of the reinforcing method according to claim 1 in an explanatory manner.
Sleeve a wall pillar shown in FIGS. 4 (a) is a "one two wing walls 210A pillar body 200A, 210B are formed so as to form a cylindrical surface substantially the same surface of the pillar body 200A".
N (≧ 2) through holes are formed in the sleeve walls 210 </ b> A and 210 </ b> B adjacent to the column main body 200 </ b> A so that N (≧ 2) through holes are arranged in the vertical direction (the direction in which they are stored in the drawing). N groups of reinforcing bars including two reinforcing bars K31 and K32 as a set are prepared.

  One group of reinforcing bars is assigned to each of the N through holes of each of the sleeve walls 210A and 210B so that the reinforcing bars K31 and K32 of each group are positioned at the height of the corresponding through hole. N groups of reinforcing bars are arranged so that the main bars are constrained by surrounding them and the corresponding through holes are penetrated by the reinforcing bars K31 and K32 so that the free ends of the reinforcing bars overlap each other. Set up. Each through hole penetrated by two reinforcing bars is filled with polymer cement mortar.

  Layers 250 and 251 of polymer cement mortar are formed so that “N group reinforcing bars” such as reinforcing bars K31 and K32 can be applied, and the N group reinforcing bars are fixed to the column main body 200A.

  Reinforcing bar members 312 and 322 are placed in contact with the wall surfaces of the sleeve wall portions 210A and 210B (surfaces facing downward in the figure in this example), and these reinforcing bar members 312 and 322 are used for the sleeve wall portions. It is applied with polymer cement mortar layers 314 and 324 and fixed to the sleeve wall portions 210A and 210B. At that time, “the portions 40A and 40B where the sleeve wall surface is exposed in a slit shape” are formed between the polymer cement mortar layers 314 and 324 for the sleeve wall and the polymer cement mortar layer 250 formed on the column main body 200A. To do.

  In FIG. 4, portions denoted by reference numerals 310 and 320 indicate portions where the reinforcing bar member 312 and the sleeve wall polymer cement mortar layers 314 and 324 are integrated with the sleeve walls 210A and 210B.

The reinforcing bar members 312 and 322 are “integrated by combining reinforcing bars two-dimensionally”.
4B and 4C illustrate two examples of specific configurations of the reinforcing bar members 312 and 322 in an explanatory manner. That is, the reinforcing bar member shown in FIG. 4B includes a plurality of reinforcing bars 350 parallel to the vertical direction and a plurality of reinforcing bars 351 parallel to the horizontal direction. Combined in a vertical lattice shape parallel to the direction and welded and integrated by full-strength rebar joint welding ", FIG. 4 (c) shows a plurality of pieces shown in FIG. 4 (b). The upper and lower grid-like arrangements of the reinforcing bars 350 and 351 are further “ integrated by combining a plurality of oblique reinforcing bars 352 and 353 and welding them by full-strength reinforcing bar joint welding ”.

  Of course, the “two-dimensional combination of reinforcing bars” in the reinforcing bar member is not limited to this example, and it is needless to say that other two-dimensional combinations are possible.

In the column with a sleeve wall reinforced by this reinforcing method, the portions 40A and 40B where the sleeve wall surface is exposed in a slit shape between the polymer cement mortar layers 314 and 324 for the sleeve wall and the layer 250 of the polymer cement mortar. The polymer cement mortar layer 250 formed on the column main body 200A is integrated with the column main body 200A to become a part of the column main body 200A, and the sleeve wall polymer cement mortar layers 314 and 324 are sleeves. The sleeves 210A and 210B are integrated with the walls 210A and 210B to become a part of the sleeve walls 210A and 210B.
In the portion where the sleeve wall surface is exposed in a slit shape, a groove is formed in which the exposed sleeve wall portion is the bottom surface and the thickness of the polymer cement mortar layers 250, 310, 320 sandwiching this portion is deep. become.

  Then, the “parts 40A and 40B where the sleeve wall surface is exposed in a slit shape” are considered to be “pseudo slit parts with weak shear strength” formed between the pillar body and the sleeve wall, and in the horizontal direction in the event of an earthquake, etc. When a large shearing force acts periodically to cause a large displacement / deformation, these portions 40A, 40B are first destroyed. Then, the column main body 200A and the sleeve walls 210A and 210B are displaced and deformed independently of each other by the action of the periodic shearing force in the horizontal direction. For example, the displacement and deformation of the sleeve walls 210A and 210B are The column main body 200A and the sleeve walls 210A and 210B have a strong resistance to the shearing force due to the toughness of the polymer cement mortar integrated with the reinforcing bars, so that the column main body 200A and the sleeve walls 210A and 210B have a strong resistance to the shearing force. As a whole, strong resistance to the shearing force can be realized.

  As a modification of the embodiment of FIG. 4, a case where one of the sleeve walls 210 </ b> A and 210 </ b> B is removed or a case where two sleeve walls are provided so as to be orthogonal to each other can be considered.

In the embodiment of FIG. 4 as well, “vertical reinforcing bars with the vertical direction as the longitudinal direction” together with “a plurality of reinforcing bars arranged in the vertical direction” with respect to the reinforcing bars K31, K32, etc. Needless to say, one or more can be provided .

Further, the method of reinforcing the sleeve wall portion as described above is not limited to the example shown in FIG. 4, and the column main body is a quadrangular column having a rectangular cross section, and one or more sleeve walls are formed in “substantially the central portion of the column surface”. Can be performed as a reinforcement of the sleeve wall portion in the case of a pillar with a sleeve wall (for example, a pillar with a sleeve wall formed with sleeve walls 120 to 123 shown in FIGS. 3A to 3E). .

FIG. 5 illustrates a first embodiment of the reinforcing method according to claim 5 in an explanatory manner.
The column with a sleeve wall to be reinforced is “a quadrangular column having a rectangular cross-sectional shape and having one or more sleeve walls formed so as to be substantially flush with the column surface”. In the form, as with the object to be reinforced in the embodiment of FIG. 4, the sleeve wall 210A, 210B is formed on the pillar body 200A so as to be “substantially flush with the pillar surface of the pillar body 200A”. It is a pillar.

  In this reinforcing method, the reinforcing bar members 331 and 341 are provided on the column surface of the column main body 200A that is flush with the sleeve walls 210A and 210B and the side surfaces of the sleeve walls 210A and 210B (the “surface facing downward” in the drawing). , 361 are placed in contact with each other. Reinforcing bar members 331, 341, and 361 are "rebars that are combined and integrated in a two-dimensional manner by full-strength rebar joint welding". The two-dimensional combination of reinforcing bars is, for example, FIG. c) and the like.

  Each of the reinforcing bar members 331, 341, 361 is coated with the polymer cement mortar layers 332, 342, 362, and is applied to the “column surfaces that are flush with the sleeve walls 210A, 210B” and the sleeve walls 210A, 210B of the column main body 200A. To settle. The portions indicated by reference numerals 330, 340, and 360 in the figure indicate portions in which the reinforcing bar members 331, 341, and 361 and the polymer cement mortar layers 332, 342, and 362 are integrated with the column surface and the sleeve walls 210A and 210B. ing.

  At this time, a portion 41A where the sleeve wall surface is exposed in a slit shape between the polymer cement mortar layer 332 formed on the column surface and the polymer cement mortar layers 342 and 362 formed on the sleeve wall portions 210A and 210B. , 41B ".

  Also in this reinforcement method, the “part where the reinforcing bar member 331 and the polymer cement mortar layer 332 are integrated with the column surface” formed on the column surface of the column main body 200A becomes a part of the column main body 200A. Reinforce. Further, the portions 340 and 360 in which the reinforcing bar members 341 and 361 and the polymer cement mortar layers 342 and 362 are integrated with the sleeve walls 210A and 210B become part of the sleeve walls 210A and 210B and the sleeve walls 210A and 210B. Reinforce.

  As in the case of the embodiment of FIG. 4, “the portions 41A and 41B where the sleeve wall surface is exposed in a slit shape” are “the portions with low shear strength” formed between the column main body and the sleeve wall. In the event of an earthquake or the like, when a strong horizontal shear force is applied periodically, these portions 41A and 41B are first destroyed, and the column main body 200A and the sleeve walls 210A and 210B are displaced and deformed independently of each other. Therefore, the displacement / deformation of the column main body 200A and the displacement / deformation of the sleeve walls 210A, 210B are less likely to influence each other, and the column with sleeve walls as a whole can achieve strong resistance to the shearing force.

It is a figure for demonstrating one form of the reinforcement construction method of a column with a sleeve wall. It is a figure which shows the modification of the form of FIG. It is a figure for demonstrating the various reinforcement aspect of a column with a sleeve wall. It is a figure for demonstrating one Embodiment of the reinforcement construction method of Claim 1 . It is a figure for demonstrating one Embodiment of the reinforcement construction method of Claim 5 .

Explanation of symbols

10A Pillar body 12A, 12B Sleeve wall HiA, HiB Through hole K1i, K2i Reinforcement 13H Polymer cement mortar filled in through hole 15 Layer of polymer cement mortar

Claims (5)

A reinforcing method for reinforcing a column with a sleeve wall in which one or more sleeve walls are formed on a column body that is a rectangular column having a rectangular cross-sectional shape ,
Drilling N (≧ 2) through-holes in the vertical direction in the portion of each sleeve wall adjacent to the pillar body,
Reinforcing bars are used as reinforcing bars,
N groups of reinforcing bars including two or more reinforcing bars as one set are prepared.
Assign one group of reinforcing bars to each of the N through holes,
The reinforcing bars of each group surround the column main body at the position of the corresponding through-hole height to restrain the main bars, and the corresponding through-holes are penetrated by one or more reinforcing bars. The reinforcing bars of the N group are arranged so that the free ends overlap each other,
A layer of polymer cement mortar is formed so that the N group reinforcing bars can be applied, and the N group reinforcing bars are fixed to the column body .
Reinforcing bars are combined in a two-dimensional manner on the wall of the sleeve wall, and the reinforcing bar members integrated by welding with full-strength reinforcing bar joint welding are installed in contact with each other,
This reinforcing bar member is coated with a polymer cement mortar layer for the sleeve wall portion by polymer cement mortar, and fixed to the sleeve wall,
And, by leaving a portion where the sleeve wall surface is exposed in a slit shape between the polymer cement mortar layer for the sleeve wall and the polymer cement mortar layer formed on the column main body, it is exposed in the slit shape. And a layer of polymer cement mortar sandwiching this portion to form a pseudo-slit portion with low shear strength . In the reinforcement method of the pillar with a sleeve wall of Claim 1,
Prior to forming a layer of polymer cement mortar so that N group reinforcing bars can be applied, each through hole is filled with polymer cement mortar. In the reinforcement method of the pillar with a sleeve wall of Claim 1 or 2,
The pillar body has two or more sleeve walls,
At least one of these two or more sleeve walls is a reinforcing method for a column with sleeve walls, wherein each through hole is penetrated by a plurality of reinforcing bars. In the reinforcement method of the column with a sleeve wall of Claim 1 or 2 or 3,
Along with a plurality of reinforcing bars arranged in the vertical direction with respect to the column main body, one or more vertical reinforcing bars made of reinforcing bars whose longitudinal direction is the longitudinal direction are provided, and the reinforcing bars and the vertical reinforcing bars are all of the strength type. A method for reinforcing a column with a sleeve wall, wherein welding is performed by reinforcing bar welding, and the welded reinforcing bar and the vertical reinforcing bar are coated with a layer of polymer cement mortar and fixed to a column body . A method for reinforcing a column with a sleeve wall, in which a quadrangular column having a rectangular cross-section is used as a column body, and one or more sleeve walls are formed so as to be substantially flush with the column surface,
Reinforcing bar members that are integrated by two-dimensionally combining reinforcing bars in two-dimensional form by full-strength reinforcing bar joint welding are installed in contact with the column surface of the column body that is substantially flush with the sleeve wall and the sleeve wall. ,
Each reinforcing bar member is coated with a polymer cement mortar layer and fixed on the column surface and the sleeve wall portion, and the polymer cement mortar layer formed on the column surface and the polymer cement formed on the sleeve wall portion By forming a portion where the sleeve wall surface is exposed in a slit shape between the mortar layer, the portion exposed in the slit shape is the bottom surface, and the thickness of the polymer cement mortar layer sandwiching this portion is the depth A method for reinforcing a column with a sleeve wall, characterized by forming a pseudo slit portion having a weak shear strength .

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