JP3110414B2 - Structure reinforcing method and structure reinforcing tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reinforcing a structure, for example, for reinforcing a reinforced concrete structure, and a structure reinforcing tool.

[0002]

2. Description of the Related Art Structural reinforcement methods for reinforcing deteriorated structures and the like have become increasingly important in the wake of the Great Hanshin-Awaji Earthquake. As a conventional method of reinforcing a structure, a carbon fiber sheet winding method of winding a carbon fiber sheet around a structure, a steel sheet winding method of winding a steel sheet over a structure, and the like are widely used.

[0003]

However, while the carbon sheet winding method is a relatively simple method, it is very expensive, and air is mixed between the sheets when the sheet is wound. There was also a possibility that a sufficient reinforcing effect could not be obtained because of the easiness. In addition, the steel sheet winding method is inexpensive,
Although this is a method of obtaining a reinforcing effect relatively stably, a heavy machine is required at the time of winding because usually a steel plate having a thickness of 4.5 mm or more is used as the steel plate 120. In addition, depending on the skill of the welder who welds the joint on site, there is a possibility that the reinforcing effect varies, and it is necessary to use a burner for welding on site.

[0004] In view of the above, the present invention is inexpensive,
And, a structure reinforcement method that can obtain a reinforcement effect stably,
An object of the present invention is to provide a method for reinforcing a structure that does not require on-site welding or heavy equipment for construction, and a structure reinforcing tool used for the method for reinforcing the structure.

[0005] In order to solve the above problems, the invention according to claim 1 includes a fixing tool having a screw hole on an outer surface of a structure.
The reinforcing steel plate having the screw holes facing outward and having holes corresponding to the screw holes provided at both ends thereof, wherein the two holes are located immediately before the screw holes. Affixing to an object, further comprising fixing the reinforcing steel plate to the structure by screwing a bolt into the hole and the screw hole, during the step, a method for reinforcing a structure, A recess is provided in a portion having the screw hole of the fixing tool, and an end of the reinforcing steel plate is
An end of the reinforcing steel plate may be fitted into the dent as a shape to fit into the dent.

As described above, in the conventional method, since the reinforcing steel plate is attached to the structure by the welding method, the thickness of the reinforcing steel plate needs to be about 4 to 5 cm. On the other hand, according to the first aspect of the present invention, the fixture is fixed to the outer surface of the structure, and the reinforcing steel plate is attached to the fixture using bolts. Therefore, the thickness of the reinforcing steel sheet can be made thinner than before in operation.

In the conventional method, the steel plate is attached by a welding method, so that a steel plate thickness of 4.5 cm is required, and the proof strength is supported by a shear force. On the other hand, according to the present invention, since the force for supporting the proof stress can be changed from the shear force to the tensile force, the same proof stress as in the conventional welding method can be obtained. Thereby, construction by weight reduction became possible.

Accordingly, the reinforcing steel plate can be made thin. That is, since the weight of the reinforcing steel plate can be reduced, the reinforcing work is facilitated.

Further, since no welding work is required for fixing the reinforcing steel plate, a variation in the reinforcing effect hardly occurs. Furthermore, since anybody can perform the mounting work without requiring a welder, the reinforcing work can be performed more easily.

In addition, since the end of the reinforcing steel plate fits into the recess of the fixture, the reinforcing steel plate is firmly fixed to the fixture. Therefore, the structure reinforcing method can more reliably obtain a reinforcing effect.

Further, as in the invention according to claim 4,
By adjusting the number of the bolts, it is possible to easily adjust the tensile force, that is, the proof stress generated in the reinforcing steel plate.

Here, the structure is, for example, a reinforced concrete structure as described in the second aspect of the present invention, but it is naturally applicable to a structure made of any building material. Further, as described in claim 2, the reinforcing effect is increased by filling the gap generated between the reinforcing steel plate and the structure with the non-shrink mortar. The screw holes may or may not penetrate the fixture.
If the screw holes are not to be penetrated, the surface provided with the screw holes must naturally face outward.

[0013]

According to a fourth aspect of the present invention, in the method for reinforcing a structure according to the first or second aspect, a through hole having a diameter smaller than that of the head of the bolt is provided on an end of the reinforcing steel plate inserted into the recess. After arranging the holding tool having a hole, the bolt is screwed into the hole and the screw hole via a through hole of the holding tool.

According to the third aspect of the present invention, the fixing tool is provided on each surface of the structure, and the divided portions of the reinforcing steel plate are attached along the corners of the structure. The shape of the structure after reinforcement is almost the same as that before reinforcement, although it is a prism. Therefore, the structure can perform a normal surface finish even after reinforcement.

Further, the invention described in claim 5 is the same as that in claim 1.
In the method for reinforcing a structure according to claim 4,
A plurality of the fixing tools are provided in a circumferential direction of the structure,
The reinforcing steel plate may be divided into a plurality in the circumferential direction and then attached to the structure.

According to the fifth aspect of the present invention, since the reinforcing steel plate is divided into a plurality of parts in the circumferential direction of the structure to reduce the weight, no heavy equipment is required for mounting. Therefore, the construction becomes a safer and easier method of reinforcing the structure as compared with the conventional method, and the reinforcing cost is reduced.

According to a sixth aspect of the present invention, in the method for reinforcing a structure according to the fifth aspect, the cross-sectional shape of the structure is polygonal, and the fixture is attached to each surface of the structure. And a part or the whole of the divided part of the reinforcing steel plate divided into the plurality of parts is attached along the corner of the structure.

According to the sixth aspect of the present invention, the fixing tool is provided on each surface of the structure, and the divided portions of the reinforcing steel plate are attached along the corners of the structure. The shape of the structure after reinforcement is almost the same as that before reinforcement, although it is a prism. Therefore, the structure can perform a normal surface finish even after reinforcement.

According to a seventh aspect of the present invention, there is provided a structural reinforcing device, which is fixed to the structure and has a screw hole at a portion facing outward, and holes corresponding to the screw holes at both ends. A reinforcing steel plate having and attached to the structure;
And a bolt screwed into the screw hole through the hole, the structural reinforcing tool being provided in a portion of the fixing tool having a screw hole, the recess receiving an end of the reinforcing steel plate, and the reinforcement A fixing portion that is provided at an end of the steel plate and that fits into the depression and fixes the reinforcing steel plate.

According to the seventh aspect of the present invention, it is possible to easily produce a reinforcing tool used in the method for reinforcing a structure according to the first and second aspects.

According to an eighth aspect of the present invention, in the structure reinforcing device of the seventh aspect, a through hole for passing the bolt is provided, and between the fitting fixing portion and the bolt. It is characterized by comprising a holding member positioned.

According to the eighth aspect of the present invention, it is possible to easily produce a structure reinforcing tool used in the structure reinforcing method according to the third aspect.

[0024]

[0025]

According to a ninth aspect of the present invention, in the structure reinforcing tool according to the seventh or eighth aspect, the reinforcing steel plate is divided into a plurality of parts with respect to an outer periphery of the structure. .

According to the ninth aspect of the present invention, it is possible to easily manufacture a structure reinforcing tool used in the structure reinforcing method according to the fifth aspect.

The invention according to claim 10 is the same as that in claim 9.
The structure reinforcing tool according to any one of claims 1 to 3, wherein the reinforcing steel plate is bent along a corner of the structure.

According to the tenth aspect of the present invention, a structure reinforcing tool used in the structure reinforcing method according to the sixth aspect can be easily manufactured.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A structure reinforcing method using a structure reinforcing tool 1 according to one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional perspective view of a reinforced concrete structure 2 reinforced by using a structure reinforcing tool 1, and FIG. 2 is a diagram illustrating a configuration of the structure reinforcing tool 1 and attaching the structure reinforcing tool 1 to the structure 2. FIG. 3 is a schematic diagram illustrating a method, and FIG.
FIG. 2 is a schematic view illustrating an example of a method for fixing a fixing tool 10, which is one component of the structure reinforcing tool 1, to the structure 2.

First, the structure of the structural reinforcement 1 will be described. As shown in FIG. 2, the structural reinforcement 1
And four reinforcing steel plates 20 whose both ends are fixed to the fixtures 10 and 10 respectively.
And by applying a force to the reinforcing steel plate 20,
Are fixed to the fixture 10 by a plurality of bolts 30, 30,...
And a retainer 40 positioned between the bolt 30 and the reinforcing steel plate 20, as shown in FIG. 1, by pouring the non-shrink mortar 3 into a gap 3 a generated between the structure 2 and Reinforce square pillar-shaped reinforced concrete such as structure 2. Here, the fixture 10 is fixed to the structure 2 using the well-known anchor 4 and bolt 5 as shown in FIG.

The fixture 10 is made of, for example, steel and has a structure in which a rectangular parallelepiped groove 11 (recess) for inserting the end portion 21 of the reinforcing steel plate 20 is provided in a prismatic ingot. Further, screw holes 12 for screwing the bolts 30 are provided at regular intervals on the bottom surface 11 a of the groove 11, and the bolts 5 are inserted between the screw holes 12 and fixed to the anchor 4. Fixing holes 13 are provided. Further, the length of the fixture 10 is substantially equal to the height of the structure 2, but is shortened to include only the vicinity where the screw hole 12 is provided, and is attached to the structure 2 for each portion where the bolt 30 is provided. Is also good. Here, by adjusting the number of the screw holes 12 and the bolts 30, the proof strength of the structural reinforcing tool 1 can be adjusted.

The reinforcing steel plate 20 is made of, for example, a steel plate having a thickness of 1.6 mm, and has a bent portion that is bent at a right angle along the corner of the structure 2 at the center. That is, the shape of the reinforcing steel plate 20 is substantially equal to the shape obtained by dividing the outer periphery of the structure 2 into four at the center of each surface. The bent portion is usually processed into a predetermined shape at a factory. Also, both ends 21 and 21 are provided with grooves 11.
The groove 11 is bent so as to cover the bottom surface 11 a and the side surface 11 b of the groove 11. Further, the end portion 21 has a hole 21 a at a position immediately above the screw hole 12 so that the bolt 30 can be screwed into the screw hole 12.

The holding member 40 is a fixing member used for fixing the reinforcing steel plate 20 to the fixing member 10 more securely. For example, the pressing member 40 is a steel prism and has an end portion 21 of the reinforcing steel plate 20.
Placed on top of In addition, the holding member 40 is a reinforcing steel plate 2.
A through hole 41 is provided at a position directly above the 0 hole 21a so as to be able to be screwed into the hole 21a and the screw hole 21 through the bolt 30. Here, the size of the through hole 41 is smaller than the diameter of the head of the bolt 30. The cross-sectional shape of the holding member 40 is desirably, as shown in FIG.
To ensure a sufficient contact area with the end 21 of the
So that the head of the steel sheet enters the inside of the reinforcing steel plate 20 body. The length of the retainer 40 is substantially equal to the height of the structure 2, but is shortened to include only the vicinity where the through hole 41 is provided, and is attached to the structure 2 for each portion where the bolt 30 is provided. Is also good.

Next, a method of attaching the structural reinforcement 1 will be described.

First, the central part of each side surface, which is the attachment part of the fixture 10 of the structure 2, is subjected to ground treatment by a method similar to a well-known steel sheet winding method.

Next, as shown in FIG. 3, the fixture 10 is fixed to the center of the side surface of the structure 2 with the groove 11 facing outward, using the bolt 30 and the anchor 4.

Next, reinforcing steel plates 20 are arranged at the four corners of the structure 2. At this time, both ends 21 and 21 of each reinforcing steel plate 20 are fitted into the groove 11 of the fixture 10 so that the hole 21a and the screw hole 12 overlap. As a result, each groove 11
, Ends 21 of two adjacent reinforcing steel plates 20 are respectively inserted. Here, the reinforcing steel plate 20
Has a plate thickness of 1.6 mm and is divided into four parts with respect to the outer periphery of the structure 2, so that it is lighter than the conventional one, and therefore can be arranged at the above-mentioned position without using heavy equipment. The reinforced steel plate 20 has a thickness of 1.6 m in order to obtain proof stress by tensile force.
With respect to m, the same yield strength as in the conventional method can be obtained.

Next, there are four end portions 2 of the reinforcing steel plate 20.
The holding tool 40 is arranged on all of the tops 1 and 21. Next, the bolts 30 are screwed into the respective screw holes 12 after passing through the through holes 41 and the two holes 21 a, thereby fixing the four reinforcing steel plates 20 to the structure 2 via the fixture 10.

Next, the gaps 3a, 3a, 3a, 3a,
Non-shrink mortar 3 is filled in 3a, 3a. This means that the four reinforcing steel plates 20 are wound around the structure 2. As a result, the structure 2 is reinforced by the structure reinforcing tool 1. At this time, the reinforcing steel plate 20 of the structural reinforcing tool 1
Since it is attached to the fixture 10 fixed to the structure 2 by the bolts 30 instead of the field welding, the strength of the structure reinforcing tool 1 can be stably obtained without depending on the constructor.

As described above, according to the structure reinforcing tool 1 of one embodiment of the present invention, the four fixing tools 10 are fixed to the center of each side surface of the structure 2, respectively, and the four reinforcing steel plates 20 are fixed. Since the non-shrinkable mortar 3 is attached to the fixture 10 with the bolts 30 and the gap 3a between the four reinforcing steel plates 20 and the structure 2 is filled with the non-shrinkable mortar 3, on-site welding is not required for construction. Therefore, the same proof strength as the conventional steel sheet winding method can be stably obtained without depending on the builder. Further, as a steel plate for winding, a plate thickness 1.6 m divided into four in the outer peripheral direction of the structure 2.
Since the reinforcing steel plate 20 made of a steel plate of m is used, no heavy equipment is required for installation. Therefore, the construction of the structural reinforcement 1 is safe and easy as compared with the conventional method. Further, since no heavy equipment is required, the reinforcing method using the structural reinforcing tool 1 is easier and less expensive than the conventional method.

Also, by changing the number of bolts 30 for attaching the reinforcing steel plate 20 to the fixture 10, the strength of the structural reinforcement 1 can be easily adjusted. In addition, structural reinforcement 1
Even if the structure is reinforced, the shape of the structure 2 is almost the same as before reinforcement, so that a normal surface finish can be performed.

Further, the bolt 30 is connected via the holding member 40.
Is screwed into the end 21 of the reinforcing steel plate 20 and the fixture 10, so that the tightening force of the bolt 30 is transmitted substantially uniformly not only in the vicinity of the bolt 30 but also over the entire surface of the end 21 of the reinforcing steel plate 20. Therefore, the bolt 30 can fix the reinforcing steel plate 20 to the fixture 10 more stably.

The present invention is not limited to the present embodiment, but can be arbitrarily modified without departing from the spirit of the present invention. For example, the reinforcing steel plate 20 wound around the structure 2 is
It is not necessary to divide the structure 2 into four parts. For example, the structure 2 may be divided and mounted on the same surface to divide the structure 2 into a larger number. In this case, the fixture 1
The position at which 0 is fixed to the structure 2 is appropriately changed according to the state of division of the reinforcing steel plate 20. Further, if the angle of the bent portion of the reinforcing steel plate 20 is appropriately changed or the reinforcing steel plate 20 is entirely curved without providing the bent portion, the structural reinforcing tool 1 becomes a polygonal column or a cylinder other than a square column. Can also be applied. Further, the shape of the groove 11 of the fixture 10 may be arbitrary,
The shape of the end 21 of the reinforcing steel plate 20 is appropriately changed so as to fit in the groove 11.

The fixing holes 13 of the fixing device 10 do not necessarily need to be provided one by one between all the screw holes 12, 12, and the weight of the structural reinforcing device 1 and the material of the material forming the structure 1 are required. It may be appropriately increased or decreased depending on the strength. Further, it is not always necessary to use the anchor 4 to fix the fixing tool 10 to the structure 2, and other well-known fixing means can be applied.

[0046]

According to the first aspect of the present invention, the fixture is fixed to the outer surface of the structure, and the reinforcing steel plate is attached to the fixture using bolts. Thus, the reinforcing effect can be obtained, and the reinforcing work is easy and inexpensive. Further, since the reinforcing steel plate is fixed to the structure by bolts instead of welding, the thickness of the reinforcing steel plate can be made smaller than before. Therefore, since the weight of the reinforcing steel plate can be reduced, the reinforcing work is further facilitated. Further, since the end of the reinforcing steel plate fits into the recess of the fixture, the reinforcing steel plate is firmly fixed to the fixture.

According to the second aspect of the present invention, in a reinforced concrete structure, a reinforcing effect can be stably obtained irrespective of a constructor, and the reinforcing cost is reduced.

[0048]

According to the third aspect of the present invention, the tightening force of the bolt is transmitted not only in the vicinity of the bolt but also substantially uniformly over the entire end of the reinforcing steel plate, so that the reinforcing steel plate is more stable. To the fixture.

According to the fourth aspect of the present invention, the proof stress of the structure can be easily adjusted.

According to the fifth aspect of the present invention, since no heavy equipment is required for installation, the construction becomes a safer and easier method for reinforcing the structure as compared with the conventional method, and the reinforcing cost is further reduced. Become cheap.

According to the sixth aspect of the present invention, since the shape of the structure is almost the same as before the reinforcement, the structure can be subjected to normal surface finishing even after the reinforcement.

According to the seventh aspect of the present invention, a structure reinforcing tool used in the structure reinforcing method according to the first and second aspects can be easily manufactured. Further, according to the invention described in claim 8, a structure reinforcing tool used in the structure reinforcing method according to claim 3 can be easily manufactured. According to the ninth aspect of the present invention, a structure reinforcing tool used in the structure reinforcing method of the fifth aspect can be easily manufactured. According to the tenth aspect of the present invention, a structure reinforcing tool used in the structure reinforcing method according to the sixth aspect can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional perspective view of a reinforced concrete structure 2 reinforced with a structure reinforcing tool 1. FIG.

FIG. 2 is a schematic diagram illustrating a structure of the structure reinforcing tool 1 and a method of attaching the structure reinforcing tool 1 to the structure 2.

FIG. 3 is a fixture 10 which is a component of the structural reinforcing device 1.
FIG. 4 is a schematic diagram illustrating an example of a method of fixing the structure to a structure 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structure reinforcement 2 Structure 3 Non-shrink mortar 3a Gap 4 Anchor 5 Bolt 10 Fixture 11 Groove (dent) 12 Screw hole 13 Fixing hole 20 Reinforcement steel plate 21 End 21a Hole 30 Bolt 40 Holder 41 Through hole

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-2114 (JP, A) JP-A 8-260717 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 23/02 E04F 13/08 101

Claims (10)

(57) [Claims] 1. A reinforcing steel plate having a fixture having a screw hole fixed to an outer surface of a structure with the screw hole facing outward, and a hole corresponding to the screw hole provided at each end. Fixing the reinforcing steel plate to the structure by attaching to the structure such that the two holes are located immediately before the screw holes, and further, screwing a bolt into the holes and the screw holes. A reinforcing method for reinforcing a structure, wherein a recess is provided in a portion having the screw hole of the fixing tool, and an end of the reinforcing steel plate is fitted in the recess. A method for reinforcing a structure, comprising: fitting an end of the reinforcing steel plate into the recess. 2. The method of reinforcing a structure according to claim 1, wherein the structure is a reinforced concrete structure, and a gap created between the reinforcing steel plate and the structure is filled with a non-shrink mortar. Structure reinforcement method. 3. The method of reinforcing a structure according to claim 1, wherein a holding hole having a smaller diameter than a head of the bolt is provided on an end of the reinforcing steel plate inserted in the recess. And disposing the bolt into the hole and the screw hole via the through hole of the holding member. 4. The method for reinforcing a structure according to claim 1, wherein the proof stress is adjusted by adjusting the number of the bolts, the number of the holes and the number of the screws corresponding to the bolts. Characteristic method of reinforcing structures. 5. The structure reinforcing method according to claim 1, wherein a plurality of the fixing tools are provided in a circumferential direction of the structure, and a plurality of the reinforcing steel plates are provided in a circumferential direction. A method for reinforcing a structure, comprising: dividing the structure; and attaching the structure to the structure. 6. The method of reinforcing a structure according to claim 5, wherein the cross-sectional shape of the structure is a polygon, and the fixing tool is provided on each surface of the structure, and further divided into the plurality. A part or all of the divided part of the reinforced steel plate is attached along the corner of the structure. 7. A fixture fixed to a structure and having a screw hole at a portion facing outward, a reinforcing steel plate having holes corresponding to the screw holes at both ends and attached to the structure, A bolt screwed into the screw hole through a hole, a structural reinforcing tool provided at a portion of the fixing tool having a screw hole, the recess receiving an end of the reinforcing steel sheet, and the reinforcing steel sheet. And a fitting fixing portion provided at an end of the fixing member and fixing the reinforcing steel plate by fitting into the recess. 8. The structural reinforcing device according to claim 7, further comprising a through hole through which the bolt is passed, and a presser positioned between the insertion fixing portion and the bolt. A structural reinforcement tool characterized by the above-mentioned. 9. The structure reinforcing tool according to claim 7, wherein the reinforcing steel plate is divided into a plurality of pieces with respect to an outer periphery of the structure. 10. The structural reinforcing device according to claim 9, wherein each divided portion of the reinforcing steel plate is bent along a corner of the structural member.