JP4596941B2 - Column reinforcement block - Google Patents

Description

  The present invention relates to a column reinforcing block used for reinforcing an existing column in a reinforced concrete building against an earthquake or the like, for example.

  Conventionally, there is a concrete block proposed by the applicant as a column reinforcing block (see, for example, Japanese Patent Laid-Open No. 2003-328666 (Patent Document 1)). The concrete block includes a bottom surface forming a parallelogram plane, an arc-shaped upper surface facing the bottom surface, and four side surfaces between the bottom surface and the upper surface.

  Then, the concrete blocks are stacked while being pasted sequentially with a cement paste or the like in the circumferential direction from the lower end of the existing pillars having a square cross section, covering the entire outer circumference of the existing pillars, and forming the existing pillars into a cylindrical shape. A steel wire previously processed into a small-diameter spiral bundle is manually wound around a groove formed on the upper surface to form a series of spirals, and the existing pillar and the concrete block are firmly integrated.

However, since the concrete block is made only of concrete, it is necessary to increase the thickness due to the strength, and the existing column is covered with a circumferential surface of a predetermined radius centered on the axis of the existing column. The area in the cross-sectional direction is increased, and the internal space of the structure composed of the existing pillars is reduced. In the concourse and parking lot in the station building, there is a problem that the use space is narrowed and the construction is difficult in a narrow space. In addition, since the concrete block is thick, the weight increases, and the efficiency of transportation work, lifting work and mounting work does not increase.
JP 2003-328666 A

  Therefore, the object of the present invention is to reduce the thickness of the block and reduce the weight, to easily construct seismic reinforcement of the existing pillars, and to increase the use space around the reinforced existing pillars Is to provide.

In order to solve the above problems, the column reinforcing block of the present invention is
A column reinforcing block that is wound around a steel wire and attached to the peripheral surface of an existing column,
An upper surface forming a parallelogram in plan view and forming an arc over the other pair of opposite sides of one and the other pair of opposite sides of the parallelogram;
A flat bottom surface facing the top surface and forming a parallelogram;
A pair of side portions one flat above a substantially crescent shape facing with connected to said top and said bottom,
A block body having the aforementioned other of the pair of side portions facing each other positioned at both ends of the arc of the upper surface that constitute the arc with connected to said top and said bottom,
And a reinforcing steel sheet provided on at least a pair of side portions of the other of the said one pair of side portions and the other of the pair of side portions of the block body,
The reinforcing steel plate is not provided between the at least one other pair of side portions and exposes at least the central portion of the upper surface of the block body, and the reinforcing steel plate is wound around the upper surface in the arc direction. It is characterized by supporting the wire .

Here, the block body is made of, for example, concrete or mortar. The reinforcing steel is not provided over between the pair of side portions, at least the central portion of the upper surface of the block main body is exposed. Moreover, the upper surface of the block main body and the upper surface of the reinforcing steel plate are smoothly continuous. Further, the reinforcing steel sheet, for example, may be provided over the entire length of the side portions, or may be provided at both ends of the side portions.

According to pillar reinforcement block of the present invention, since provided with the block body, and the reinforcing steel sheet provided on at least a pair of side portions of the block body, as compared with the block of concrete alone, the strength is large Can reduce the wall thickness.

  Thus, since the thickness of the column reinforcing block can be reduced, the use space around the existing column whose outer periphery is reinforced by the column reinforcing block can be expanded. Moreover, the reinforcement block can be lightened by thinning, and the efficiency of carrying work, lifting work and mounting work can be increased.

Further, when a steel wire is wound around the upper surface of the reinforcing block in the arc direction of the upper surface, and when the steel wire gives a large support pressure to the reinforcing block during an earthquake, the reinforcing block even thin thickness of, since the open face of the side portion of the block body is reinforced by the reinforcing steel, the reinforcing block, with respect to the bearing capacity power does not destroy.

  In addition, since at least a part of the upper surface of the block body is exposed, when an existing pillar is cracked by an earthquake, the crack is formed on the upper surface (exposed surface, for example, made of concrete). ) And can observe (visually) the destruction state (situation) of the pillar.

Moreover, in the pillar reinforcing block of one embodiment,
The reinforcing steel is provided on a pair of side portions of the other,
The other of the pair of side portions, a convex curved surface outwardly continuous with the curved surface of the upper surface,
The reinforcing steel plate has an anchor embedded in the block body.

According to pillar reinforcement block of this embodiment, the anchor of the reinforcing steel sheet, because it is embedded in the block body, the reinforcing steel can be securely fixed to the other of the pair of side portions of the block body . Further, the reinforcing steel plate can prevent the corners of the block main body from being chipped against the support pressure of the steel wire.

Further, in the pillar reinforcement block of one embodiment, the reinforcing steel surrounds the pair of side portions of one of the pair of side portions and the other above.

According to pillar reinforcement block of this embodiment, the reinforcing steel sheet, because it surrounds the entire side portion of the block body, with respect Bearing force of the steel wire, Ya corners of the block main body (corner) It is possible to prevent the corners on the open surface side more reliably. Also, the block is easy to handle when it is transported without the risk of missing the corners of the block. Moreover, it is not necessary to embed and fix the reinforcing steel plate in the block body, and an anchor or the like is not required for the reinforcing steel plate.

  Moreover, in the column reinforcing block of one embodiment, mesh lines are embedded in the vicinity of the upper surface of the block main body.

  According to the column reinforcing block of this embodiment, since the mesh streaks are embedded in the vicinity of the upper surface of the block main body, the strength of the block main body can be further improved.

Further, in the pillar reinforcement block of an embodiment, the upper surface of the block body, arranged at intervals in a direction perpendicular to the pair of side portions of the one above extends in a direction parallel to the pair of side portions of the one above A plurality of convex portions are provided.

According to the column reinforcing block of this embodiment, since the plurality of convex portions are provided on the upper surface of the block main body, a groove is formed between the adjacent convex portions. That is, the block body has a plurality of grooves parallel to the pair of side portions of the one above. The bottom of this groove is the upper surface of the block body.

  Thus, when the existing pillar is formed in a columnar shape so as to cover the entire circumference of the existing pillar by the block, a continuous spiral groove is formed on the upper surface of the block main body which becomes the outer peripheral surface. Therefore, if a steel wire that has been processed in a spiral shape is wound around the groove, the winding interval can be accurately ensured, and further, deviation and disconnection of the steel wire can be prevented, and the existing columns can be reinforced reliably.

According to pillar reinforcement block of the present invention, since provided with the reinforcing steel to at least a pair of side portions of the block body, can be lightweight to reduce the wall thickness of the block, easily Retrofit of existing column In addition to being able to construct, it is possible to expand the space available around the reinforced existing pillars.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1A is a plan view showing an embodiment of a column reinforcing block according to the present invention. FIG. 1B shows a lower side view of the column reinforcing block, and FIG. 1C shows a right side view of the column reinforcing block.

The pillar reinforcement block 51 has an upper surface 14, bottom surface 11, the upper and lower side portions 12a, 12b and left and right side portions 13a, and the block body 10 having 13b, left and right side portions 13a of the block body 10, 13b each The reinforcing steel plates 3 and 3 are provided.

The top surface 14, as well as forms a plan view a parallelogram, an arc over the parallelogram of the pair of opposed sides (left and right side portions 13a, 13b). The bottom surface 11 has a flat shape that faces the top surface 14 and forms a parallelogram.

The upper and lower side portions 12a, 12b (one pair of side portions) are opposed with connected to the upper surface 14 and the bottom surface 11. The upper and lower side portions 12a, 12b are flat in the substantially crescent (semicylindrical).

The left and right side portions 13a, 13b (the other of the pair of side portions) are opposed with connected to the upper surface 14 and the bottom surface 11. The left and right side portions 13a, 13b forms a convex curved surface outwardly continuous with the curved surface of the top surface 14.

The reinforcing steel plate 3 is provided with the left and right side portions 13a, a strip-shaped main body portion 31 formed along 13b, and the two anchors 32, 32 which protrude from the inner surface of the main body portion 31. The anchor 32 is integrally fixed to the inner surface of the main body 31 by welding means or the like. The anchor 32 is embedded in said block body 10 at the respective end portions of the left and right side portions 13a, 13b.

The block body 10 is made of concrete or mortar, for example. The reinforcing steel 3, left and right side portions 13a, not provided over a period of 13b, the center portion of the upper surface 14 of the block body 10 is exposed. The reinforcing steel plate 3, said left and right side portions 13a, in the vicinity of 13b the upper surface 14 covers.

The upper surface 14 of the block body 10 and the upper and lower side portions 12a, the upper and lower side portions 12a extends in a direction parallel to 12b, a plurality of protrusions 17 disposed at intervals in a direction perpendicular to 12b provided Yes. The upper surface of the convex portion 17 forms an arc along the upper surface 14.

That is, a groove 15 is formed between the adjacent convex portions 17 and 17. That is, the block body 10 has the above upper and lower side portions 12a, a plurality of grooves 15 parallel to 12b. The bottom of the groove 15 is the upper surface 14 of the block body 10. And the upper surface 14 (bottom of the said groove | channel 15) of the said block main body 10 and the upper surface of the said reinforcing steel plate 3 are continuing smoothly. The shape of the groove 15 is not limited to an arc shape, but may be a shape that forms a recess.

The anchor 32 of the reinforcing steel plate 3 extends from the outer side to the inner side of the outermost groove 15 in plan view. That is, the anchor 32 extends in a direction inclined with respect to the left and right side portions 13a, 13b. Incidentally, the main body portion 31 of the reinforcing steel plate 3, said left and right side portions 13a, instead of the length over the length of the 13b, the side portion 13a includes an anchor 32 at both ends, in the opposite ends of 13b, and, most It is sufficient that the length reaches the position of the groove 15 at the side end.

  A mesh line 16 is embedded in the vicinity of the upper surface 14 of the block main body 10. The mesh streaks 16 may be provided over the entire surface of the block body 10, and the strength of the block body 10 can be improved. The main body 31 of the reinforcing steel plate 3 has a bolt hole 33. The bolt hole 33 is used for inserting a bolt for fixing the reinforcing steel plate 3 to a formwork (described later), and further when the block 51 is attached to an existing column 20 (described later). Used to insert a bolt for lifting the block 51.

  The manufacturing method of the column reinforcing block 51 will be described. The reinforcing steel plates 3 and 3 having the anchors 32 and the mesh bars 16 are installed in a mold (not shown) and the concrete or The block main body 10 is formed by pouring mortar, and then the mold is removed to manufacture the column reinforcing block 51. Thus, the anchor 32 and the mesh streaks 16 of the reinforcing steel plate 3 can be embedded in the block body 10. The mold is provided with a groove corresponding to the convex portion 17.

FIGS. 2 and 3 are a front view and a plan view showing a state in which the column reinforcing block 51 is reinforced by sticking to the four circumferential surfaces of the existing column 20 having a square cross section. The block 51, the width between the left and right reinforcing steel 3,3 Yes made smaller than the width of the existing columns 20, further upper and lower side portions 12a, the height between the 12b also smaller than the width of the existing pillar 20 It has become. The block 51 is bonded in order in the circumferential direction while adhering the bottom surface 11 to the lower portion of the peripheral surface 21 of the existing column 20 with cement paste, and then the poorly mixed mortar 23 or the like is placed on the column reinforcing block 51 that has already been bonded. The blocks 51 are stacked through the filled spacing portions 22 and are similarly attached to the circumferential surface 21 of the existing pillar 20 in the circumferential direction in a similar manner so as to cover the outer periphery of the existing pillar 20 spirally upward from the base portion 20a. Will go. However, the upper and lower ends of the existing column 20 are not covered with the block 51 so that the flexural rigidity of the reinforcing column can be suppressed and the existing column 20 can be flexed flexibly with an earthquake load (see FIG. 2). In FIG. 2, although across the poor compounding mortar 23 between the upper and lower blocks 51 and 51, skip this poor mixing mortar 23, a gap between the upper and lower side portions 12a, 12b of the block 51 22 You may just provide.

The upper and lower side portions 12a, a plurality of grooves 15 parallel to 12b of the block 51, when the block 51 covers the four sides of the existing column 20, adjacent the circumferential direction through the four corners of the gap 22a of the existing pillar 20 The grooves 51 of the blocks 51 and 51 to be smoothly connected spirally. In FIG. 2, four grooves 15 per one block 51 are shown.

  As shown in FIG. 3, when the block 51 covers the existing column 20, the outer surface of the circular arc surface that is the convex portion 17 is a circumscribed circle around the axis C of the existing column 20 reinforced by the block 51. It is on the inner side than 20b. This is because the block 51 is made of concrete or mortar in which the anchor 32 of the reinforcing steel plate 3 and the mesh reinforcement 16 are embedded, and is thinner and lighter than that made only of concrete. This is because the same strength can be obtained even if the above is applied, and in a block made only of concrete, a thickness corresponding to the circumscribed circle 20b is required.

  Therefore, the existing pillar 20 reinforced with the block 51 can widen the surrounding use space, and is particularly advantageous for reinforcing the existing pillar 20 in a concourse of a station building or in a parking lot. Furthermore, work efficiency can be improved by making the block thinner and lighter, and construction can be performed even in a narrow work space. That is, the efficiency of carrying work, lifting work and mounting work of the block 51 can be increased.

  FIG. 4 is a development view showing the groove 15 of the block 51 covering the four peripheral surfaces 21 of the existing pillar 20 and the spiral steel wire 24 fitted into the groove 15 and wound.

  As shown at the left end of FIG. 4, the groove 15 has a sine wave shape and starts from the lower end of the block 51 attached to the lower portion of the first peripheral surface 21 a, and sequentially passes through the corner gap 22 a of the existing column 20. Connected to the grooves 15 of the three blocks pasted on the peripheral surfaces 21b, 21c, and 21d adjacent to the right, after making a round of the existing pillar, the block of the peripheral surface 21a is again shown (a part of the block is overlapped with the right end of FIG. 4). It repeats this to the upper groove of the existing pillar and reaches the upper end of the existing pillar. A steel wire 24 is wound around the spiral groove 15 as shown in the figure.

The upper and lower side portions 12a, 12b, i.e. a groove 15 extending parallel thereto of the block 51 in FIG. 4 shown as a parallelogram of the upper and lower sides, as can be seen from FIG. 4, four of the peripheral surface of the existing columns 21a~21d 1 round, the distance rises by a distance of 1 pitch p of the groove 15. Speaking of one groove 15 that crosses the block 51 (for example, the lower end of the peripheral surface 21a), the ascending distance of the groove 15 rises from p / 4 corresponding to 1/4 of the existing column to the interval corresponding to the column angle. The value obtained by subtracting the minute α (p / 4−α). Accordingly, the upper and lower side portions 12a of the block 51, also the inclination of 12b, as shown in FIG. 1A, a perpendicular foot drawn down the right side 13b from the lower end of the left side 13a of the parallelogram of the right and left sides, bottom end of the right side 13b The slope is such that the distance between is (p / 4-α). The increase α corresponding to the gap interval refers to an increase distance when the groove 15 advances with the same inclination as the block 51 in the columnar gap 22a in FIG.

  The steel wire 24 wound around the groove 15 is a spiral bundle having a diameter smaller than the diameter of the groove 15 that goes around the existing pillar 20 (preferably a diameter that is 80% of the length of the diagonal line of the cross section of the existing pillar 20). And is manually wound without using a tension machine such as a hydraulic cylinder. Since the method of winding the steel wire 24 bundled in a spiral shape around the existing pillar is described in detail in Japanese Patent No. 149647 belonging to the applicant, only a brief description will be given here.

  That is, the steel wire 24 processed into a spiral bundle is arranged vertically so that the loop surface of the bundle is parallel to the peripheral surface 21 of the existing column 20, and a starting end 24a bent at a right angle to start winding (FIG. 4). Is inserted into a hole (not shown) provided at the lower end of the peripheral surface 21a and fixed, and is rotated around the existing pillar 20 while rotating in a direction to unwind the bundle of steel wires 24. It winds around the pillar 20, the steel wire 24 is fitted in the spiral groove 15, and it winds up sequentially. Finally, the end 24b (see FIG. 2) bent at a right angle is inserted into a hole provided at the upper end of the peripheral surface 21 and fixed to complete the winding. The method of fixing the end of the steel wire 24 is not to fix the peripheral portion 21 of the existing column 20 but to wind the steel wire 24 around the outer periphery of the block 51 and fix the overlapped portion with a clip. Good.

  In this method, the spiral bundle of the steel wires 24 is not bent and opened largely in the loop plane in the direction of unwinding the loop, but the spiral bundle of the steel wires 24 is looped around the existing pillar 20 and the steel wire 24 is moved around. Since winding can be performed within an elastic deformation range that is slightly twisted around the shaft, a large-scale machine such as a hydraulic cylinder is not required as in the prior art, and construction can be performed easily and quickly with only human power. The steel wire 24 may be a steel bar or a stranded wire.

  Next, a method of reinforcing the existing pillar 20 using the block 51 will be described.

First, the poor blending mortar 23 is applied to the base portion 20a on the outer periphery of the lower end of the existing column 20 with a predetermined thickness, and cement paste is applied to at least one of the four peripheral surfaces 21 of the existing column 20 or the bottom surface 11 of the block 51. after applying, the lower portion 12b of the block 51 is brought into contact with the bottom surface 11 while placed in a poor mixing mortar 23 in the circumferential surface 21, pasting four blocks 51 on the outer periphery of the existing columns 20.

Next, a spacing portion 22 having a thickness of 1 to 2 cm filled with poor blending mortar 23 is provided on the upper portion 12a of each pasted block 51, and four blocks 51 are stacked on the upper surface 12a in the same manner and pasted on each peripheral surface 21. To go. Here, since the block 51 is a parallelogram whose left and right sides and upper and lower sides are not orthogonal as shown in FIG. 4, the upper surface of the poor blending mortar 23 at the lower end and the spacing portion filled with the poor blending mortar 23 between the upper and lower blocks. 22 is inclined with respect to a horizontal plane.

  When the pasting of the block 51 over the entire length of the four peripheral surfaces 21 of the existing pillar 20 is finished, the spiral bundle having a slightly smaller diameter than the diameter of the spiral groove 15 of the block 51 that goes around the existing pillar 20 once is formed. The steel wire 24 processed in advance is fitted into the spiral groove 15 by the above-described manual method, and the winding over all the blocks 51 is completed. As described above, the winding method of the steel wire 24 has an advantage that it can be easily and quickly constructed by only human power without requiring a large machine such as a hydraulic cylinder.

  Note that the upper and lower ends of the existing pillar 20 are not covered with the block 51 because the bending rigidity already described is not excessive. Further, since the wound steel wire 24 is closely fitted in the groove 15 and does not shift, it is not necessary to apply mortar to the entire surface of the steel wire 24 as in the prior art. As described in FIGS. 3 and 4, the start end 24 a and the end end 24 b of the steel wire 24 are inserted and fixed in the holes provided in the peripheral surface 21 of the existing pillar 20, but instead, the steel wires 24 are connected to each other. It may be fixed by tying with a binding wire or the like. Furthermore, as already described, if an appropriate interval is provided between the blocks 51 stacked one above the other, the poor blending mortar 23 can be omitted without any problem.

  The existing pillar 20 reinforced in this way behaves as follows during an earthquake and effectively absorbs vibration energy of the earthquake.

  The existing pillar 20 is not a vertically long and unitary four PC plates attached to the four peripheral surfaces as in the prior art. Instead, as shown in FIG. 3 and FIG. The gaps 22a are formed in which the peripheral surfaces of the corners of the existing pillars 20 are exposed by being piled up and pasted while providing a gap.

  Therefore, when a bending load due to an earthquake is applied, the existing pillar 20 is opened as the poor blending mortar 23 in the stacked portion of the block 51 is broken and deformed as shown in FIG. 5 before the excessive bending load is applied. In other words, unlike the conventional case, the reinforced column 20 of this embodiment does not have excessive bending rigidity to reduce the deformability and energy absorption capability, and as a result, the earthquake resistance is improved. Further, since the blocks 51 and 51 adjacent in the circumferential direction do not contact each other by the gap 22a, the contact portions do not collide with each other due to the deformation of the existing pillar 20 due to an earthquake and are not dropped off. Moreover, since the gap 22a is provided, when an existing pillar is damaged by an earthquake, the degree of damage can be observed.

  Since the existing pillar 20 is wound by expanding the diameter of the steel wire 24 that has been processed in a spiral shape slightly smaller than the diameter of the spiral groove 15 while slightly twisting it, without using a hydraulic cylinder or the like. The steel wire 24 comes into close contact with the block 51 with an elastic force, and the wound steel wire 24 greatly improves the shear strength of the existing column 20. In other words, the reinforced column 20 of this embodiment has improved shear strength without increasing bending rigidity, resulting in improved toughness, effectively absorbing seismic energy, and existing columns 20. Can be reinforced firmly.

Further, the block 51 of this embodiment, as already mentioned, unlike the block applicant consists only previously proposed concrete, provided the reinforcing steel plate 3 to the left and right side portions 13a, 13b of the block body 10 Therefore, the strength can be increased even if the wall thickness is reduced. Furthermore, since the mesh streaks 16 are embedded in the block body 10, the thickness can be further reduced.

  Thus, since the thickness of the block 51 can be reduced, the available space around the existing pillar 20 whose outer periphery is reinforced by the block 51 can be expanded. Moreover, the said block 51 can be lightened by thickness reduction, and the efficiency of a conveyance operation | work, a lifting operation | work, and an attachment operation | work can be raised.

Further, when the steel wire 24 is wound around the upper surface 14 of the block 51 in the arc direction of the upper surface 14, and when the steel wire 24 gives a large support pressure to the block 51 during an earthquake, the block 51 even thin thickness of 51, the left and right side portions 13a of the block body 10, since the open face of the 13b are reinforced by the reinforcing steel plate 3, the block 51 relative to the bearing capacity power does not destroy. That is, the reinforcing steel plate 3 can prevent the corners (corners) of the block body 10 from being chipped against the support pressure of the steel wire 24.

Also, the anchor 32 of the reinforcing steel 3, since it is embedded in the block body 10, the reinforcing steel plate 3 can be securely fixed to the left and right side portions 13a, 13b of the block body 10. Further, the anchor 32 extends in an oblique direction from the position where the outermost steel wire 24 is wound around the block body 10 to a central portion when a plurality of steel wires 24 are wound at a predetermined interval. The anchor 32 can be reliably prevented from coming off from the block body 10.

  In addition, since at least a part of the upper surface 14 of the block body 10 is exposed, when the existing pillar 20 is cracked by an earthquake, the crack is formed on the upper surface of the block body 10 formed of concrete or mortar. 14 (that is, the exposed surface), and the destruction state (situation) of the column can be observed (visually observed).

(Second Embodiment)
6A, 6B, and 6C show a second embodiment of the column reinforcing block of the present invention. The block 52 of the second embodiment is the same as the block 51 of the first embodiment except that the upper surface 14 does not have the convex portion 17 (that is, the groove 15) of the first embodiment. It is the same configuration.

  Thus, since the block 52 does not have a convex portion on the upper surface 14, the block 52 can be further reduced in weight and thickness, the manufacture of the block 52 is facilitated, and the block 52 is damaged during construction. Can be easily prevented. Since other structures are the same as those of the first embodiment, description thereof is omitted.

The anchor 32 is inclined in an oblique direction from the position where the outermost steel wire 24 (indicated by the phantom line) is wound around the block body 10 to a central portion when a plurality of steel wires 24 are wound around the block body 10 at a constant interval. It extends. Incidentally, the main body portion 31 of the reinforcing steel plate 3, said left and right side portions 13a, instead of the length over the length of the 13b, the side portion 13a includes an anchor 32 at both ends, in the opposite ends of 13b, and ( It may be any length that exceeds the position where the outermost steel wire 24 is wound (shown in phantom).

( Reference example )
7A, 7B, and 7C show reference examples of the column reinforcing block of the present invention. In block 53 of the reference example, except that the left and right side portions 13a, the upper and lower side portions 12a instead of 13b, reinforcing the steel plate 3 to 12b are provided, of the second embodiment the block 52 It is the same composition as.

The reinforcing steel plate 3, said upper and lower side portions 12a, at both ends and the central portion of 12b, with an anchor 32 embedded in the block body 10. The anchor 32 has the left and right sides up to the center from the position where the outermost steel wire 24 (indicated by the phantom line) is wound around the block body 10 when a plurality of steel wires 24 are wound at regular intervals. side portion 13a, and extends parallel to 13b. The reinforcing steel plate 3 is not covering the upper surface 14 in the vicinity of the upper and lower side portions 12a, 12b, the whole of the upper surface 14 is exposed.

Thus, the anchor 32 of the reinforcing steel 3, since it is embedded in the block body 10, the reinforcing steel plate 3 can be securely fixed to the upper and lower side portions 12a, 12b of the block body 10. Further, the reinforcing steel plate 3 can prevent the corners (corners) of the block body 10 from being chipped against the support pressure of the steel wire 24. Since other structures are the same as those of the first embodiment and the second embodiment, the description thereof is omitted. Incidentally, the main body portion 31 of the reinforcing steel plate 3 is not a length over the length of the upper and lower side portions 12a, 12b, In the both ends of the side portions 12a, 12b, and, as appropriate, including an anchor 32 at both ends It is sufficient that the length extends in the center by the length.

( Third embodiment)
8A, 8B and 8C show a third embodiment of the column reinforcing block of the present invention. In block 54 of the third embodiment, except that the upper and lower side portions 12a, 12b and the left and right side portions 13a, a reinforcing steel plate 3 on both 13b are provided, the reference example block 53 It is the same composition as.

The reinforcing steel plate 3 encloses the upper and lower side portions 12a, 12b and the left and right side portions 13a, a 13b. The reinforcing steel plate 3 does not have the anchor 32 of the reference example .

Thus, the reinforcing steel 3, because it surrounds the entire side portion of the block body 10, with respect Bearing force of the steel wire 24, more reliably the chipping of the corners of the block body 10 (corners) Can be prevented. Further, when the block 54 is transported, the corners of the block 54 are not likely to be cut off and are easy to handle. Moreover, it is not necessary to embed and fix the reinforcing steel plate 3 in the block body 10, and an anchor or the like is not necessary for the reinforcing steel plate 3. Since other structures are the same as those of the first and second embodiments and the reference example , description thereof is omitted.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the number of the convex portions 17 (the grooves 15), the mesh streaks 16, the anchors 32, and the like can be increased or decreased depending on the degree of reinforcement required by the block, for example.

It is a top view which shows 1st Embodiment of the block for column reinforcement of this invention. It is a lower side view of a column reinforcement block. It is a right view of the block for pillar reinforcement. It is a front view of the existing pillar reinforced with the block for pillar reinforcement. It is a top view of the existing pillar reinforced with the block for pillar reinforcement. It is an expanded view of the groove | channel of the column for a block reinforcement, and the spiral-shaped steel wire fitted and wound by this groove | channel. It is a front view which shows the mode of a deformation | transformation of the existing pillar by an earthquake load. It is a top view which shows 2nd Embodiment of the block for column reinforcement of this invention. It is a lower side view of a column reinforcement block. It is a right view of the block for pillar reinforcement. It is a top view which shows the reference example of the block for column reinforcement of this invention. It is a lower side view of a column reinforcement block. It is a right view of the block for pillar reinforcement. It is a top view which shows 3rd Embodiment of the block for column reinforcement of this invention. It is a lower side view of a column reinforcement block. It is a right view of the block for pillar reinforcement.

3 reinforcing steel 10 block body 11 bottom 12a, the side portions of 12b vertical (one pair of side portions)
13a, the side portions of 13b left and right (the other of the pair of side portions)
14 Upper surface 15 Groove 16 Mesh line 17 Convex part 20 Existing column 21 Peripheral surface 22 Spacing part 23 Poor blending mortar 24 Steel wire 31 Main body part 32 Anchor 51, 52, 53, 54 Column reinforcement block

Claims (5)

A column reinforcing block that is wound around a steel wire and attached to the peripheral surface of an existing column,
An upper surface forming a parallelogram in plan view and forming an arc over the other pair of opposite sides of one and the other pair of opposite sides of the parallelogram;
A flat bottom surface facing the top surface and forming a parallelogram;
A pair of side portions one flat above a substantially crescent shape facing with connected to said top and said bottom,
A block body having the aforementioned other of the pair of side portions facing each other positioned at both ends of the arc of the upper surface that constitute the arc with connected to said top and said bottom,
And a reinforcing steel sheet provided on at least a pair of side portions of the other of the said one pair of side portions and the other of the pair of side portions of the block body,
The reinforcing steel plate is not provided between the at least one other pair of side portions and exposes at least the central portion of the upper surface of the block body, and the reinforcing steel plate is wound around the upper surface in the arc direction. A column reinforcing block characterized by supporting a wire . The column reinforcing block according to claim 1,
The reinforcing steel is provided on a pair of side portions of the other,
The other of the pair of side portions, a convex curved surface outwardly continuous with the curved surface of the upper surface,
The reinforcing steel plate has an anchor embedded in the block main body, the column reinforcing block. The column reinforcing block according to claim 1,
The reinforcing steel is posts reinforcing block, characterized in that one of the pair of side portions the and surrounding the pair of side portions of the other. The column reinforcing block according to claim 1,
A column reinforcing block characterized in that mesh streaks are embedded in the vicinity of the upper surface of the block main body. The column reinforcing block according to claim 1,
The upper surface of the block body, characterized in that a plurality of convex portions arranged at intervals in a direction perpendicular to the pair of side portions of the one above extends in a direction parallel to one of the pair of side portions the Column reinforcement.

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