JP2007040025A - Reinforcing structure of structural body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure of a structural body capable of shortening construction term and reinforcing simply. <P>SOLUTION: This reinforcing structure 10 of the structural body is constituted by winding a net material (a grid-like reinforcing material) 13 through a rubber material (a sheet-like elastic material) 12 having predetermined thickness to cover the structural body 11. The rubber material is formed like a sheet to cover the circumference of the structural body and has a thickness being sufficient for reinforcing the structural body. The net material is constituted by arranging a plurality of vertical strands arranged in parallel and a plurality of horizontal strands arranged in parallel so as to cross at a right angle and is formed like a belt to cover the circumference of the structural body on an outer side of the rubber material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reinforcing structure for a structure.

  Conventionally, masonry structures formed by stacking stones or bricks, or unreinforced concrete structures formed using concrete, are applied to structures such as abutments and piers that construct the substructure of bridges. It was.

  Many masonry structures or unreinforced concrete structures exist as substructures of bridges on railroad tracks and are still used today.

  Many of these structures were formed in the early Showa era, the Taisho era, and the Meiji era. Therefore, there are cases where the strength is low from the beginning of formation, and there are cases where the strength is reduced due to deterioration since 70 years have passed since the formation.

  For example, in a masonry structure using bricks, the strength at the joint may be low, and the strength at the joint may be reduced due to deterioration. In an unreinforced concrete structure, the strength at the joint portion of the concrete may be low, and the strength at the joint portion of the concrete may be reduced due to deterioration.

  Masonry structures or unreinforced concrete structures that have low-strength locations, and masonry structures or unreinforced concrete structures that have low-strength locations are subject to external forces, such as due to earthquakes. When is added, brittle fracture may occur at locations where the strength is low or where the strength is reduced, and the bridge may collapse.

  Therefore, various methods have been provided in the past in order to reduce the risk of brittle fracture occurring in the structure. For example, a method of replacing a masonry structure or an unreinforced concrete structure with a reinforced concrete structure is one of them.

  However, this construction method requires the existing structure to be demolished, and a new structure must be formed from scratch. Therefore, there is a problem that a high construction cost is required to replace an existing structure with a reinforced concrete structure.

  In order to reduce the construction cost while reducing the risk of brittle fracture in the structure due to having low strength and having reduced strength, the masonry structure and There is also a construction method that uses reinforced concrete structures. Such construction methods include a reinforced concrete winding method, a steel plate winding method, and a continuous sheet winding method.

  In the reinforced concrete winding method, a reinforcing bar is provided outside the structure so as to surround an existing columnar structure, and then a formwork provided with a support work outside the reinforcing bar is provided around the structure. Concrete is placed between the structure and the reinforcing bar and between the reinforcing bar and the formwork. As shown in FIG. 12, a reinforcing structure for a structure using a reinforced concrete winding method is provided with reinforced concrete 4 having rebars 2 a and 2 b and concrete 3 so as to cover the periphery of the structure 1.

  In the steel sheet winding method, as shown in FIG. 13, after two strip-shaped steel plates 5a and 5b are placed outside the structure 1 so as to surround the existing structure 1, the steel plates 5a and 5b are placed on both ends. The steel plate 5a and the steel plate 5b are connected by the joint joints 6a and 6b, respectively, and then the mortar 7 is filled between the structure 1 and the steel plates 5a and 5b. The reinforcing structure of the structure 1 using the steel sheet winding method is provided with steel plates 5 a and 5 b and a mortar 7 so as to cover the periphery of the structure 1. In some steel sheet winding methods, the joints 6a and 6b are not used, but both side ends of the steel plate 5a and both side ends of the steel plate 5b are welded.

  In the continuous fiber sheet winding method, after performing surface treatment to remove foreign matters such as dust attached to the surface of the existing structure, an adhesive such as epoxy resin is used around the existing structure, carbon fiber, A continuous fiber sheet such as an aramid fiber is laminated and attached. As shown in FIG. 14, the reinforcing structure of the structure 1 using the continuous fiber sheet winding method covers the periphery of the structure 1 so that the structure 1 and the fiber sheets 8a, 8b, and 8c are integrated. A plurality of (three in the illustrated example) fiber sheets 8a, 8b, and 8c are provided via an adhesive.

  According to the reinforcing structure of the structure 1 using the reinforced concrete winding method, the reinforced concrete 4 reinforces the structure 1, and thus the possibility of the structure 1 being destroyed can be reduced.

  According to the reinforcing structure of the structure 1 using the steel sheet winding method, the steel plates 5a and 5b and the mortar 7 reinforce the structure 1, so that the possibility of the structure 1 being destroyed can be reduced.

  According to the reinforcing structure of the structure 1 using the continuous fiber sheet winding method, since the fiber sheets 8a, 8b, and 8c reinforce the structure 1, the possibility of the structure 1 being destroyed can be reduced. .

  Furthermore, according to the reinforcing structure of the structure 1 using these methods, it is not necessary to tear down the structure 1 and it is not necessary to form a new structure from scratch. The construction cost can be reduced as compared with the case where 1 is replaced with a reinforced concrete structure.

  By the way, the reinforcing structure of the structure 1 using the reinforced concrete winding method is to provide a reinforcing bar 2b outside the structural body 1 so as to surround the existing structural body 1, and to the outside of the reinforcing bar 2b around the structural body 1. Since it is necessary to provide a formwork provided with a support work, and to place concrete between the structure 1 and the reinforcing bar 2b and between the reinforcing bar 2b and the formwork, there is a problem that requires a long construction period. there were.

  The reinforcing structure of the structure 1 using the steel sheet winding method is that two strip-shaped steel plates 5a and 5b are disposed outside the structure 1 so as to surround the existing structure 1, the structure 1 and the steel plate 5a. , 5b, it is necessary to fill the mortar 7 with a problem that requires a long construction period.

  Since the reinforcing structure of the structure 1 using the continuous sheet winding method needs to perform a surface treatment to remove foreign matters such as dust attached to the surface of the existing structure 1, there is a problem that it takes time and effort. It was.

  Therefore, the reinforcing structure of the structure 1 using the reinforced concrete winding method and the reinforcing structure of the structure 1 using the steel plate winding method have a problem that requires a long construction period, and the continuous fiber sheet winding method is used. The reinforced structure of the existing structure 1 has a problem that it takes time and effort to remove foreign matters such as dust attached to the surface of the existing structure 1.

  These problems are not limited to reinforcing the piers and abutments provided in the lower structure of the bridge, and may also occur when reinforcing other structures such as the piers and abutments provided in the lower structure of the expressway. There is.

  Then, in view of the said situation, this invention aims at providing the reinforcement structure of the structure which can shorten a construction period and can be easily reinforced.

  In order to achieve the above-described object, a reinforcing structure for a structure according to claim 1 of the present invention is characterized in that a lattice-shaped reinforcing material is wound so as to cover the structure.

  According to claim 2 of the present invention, the reinforcing structure for a structure according to claim 1 is characterized in that a lattice-shaped reinforcing material is wound around a sheet-like elastic material so as to cover the structure.

  According to a third aspect of the present invention, there is provided the reinforcing structure for a structure according to the first or second aspect, wherein a plate-shaped protective member is provided outside the lattice-shaped reinforcing material so as to cover the lattice-shaped reinforcing material. Features.

  In the reinforcing structure for a structure according to claim 1 of the present invention, the lattice-shaped reinforcing material is wound so as to cover the structure, so that the lattice-shaped reinforcing material reinforces the structure and reduces the possibility of the structure being destroyed. can do. Furthermore, since the lattice-shaped reinforcing material is wound around the structure, it is not necessary to integrate the lattice-shaped reinforcing material and the structure, and it is not necessary to perform a surface treatment for removing foreign matters such as dust from the surface of the structure. Therefore, since it is not necessary to perform a surface treatment for removing foreign substances from the surface of the structure, it is possible to provide a structure reinforcement structure that can be easily reinforced. Moreover, the structure can be reinforced by winding the lattice-shaped reinforcing material around the structure. Therefore, rebars are provided outside the structure so as to surround the existing structure, a formwork provided with a support work outside the rebar around the structure, between the structure and the rebar, and the rebar Concrete is placed between the mold and the formwork, two strip-shaped steel plates are placed outside the structure so as to surround the existing structure, and mortar is filled between the structure and the steel plate Since it is unnecessary to do this, the construction period can be shortened.

  In the reinforcing structure for a structure according to claim 2 of the present invention, the lattice-shaped reinforcing material is wound through the sheet-like elastic material so as to cover the structure, so that the sheet-like elastic material and the lattice-shaped reinforcing material reinforce the structure. In addition, the possibility of the structure being destroyed can be further reduced. In addition, since the lattice-shaped reinforcing material is wound around the structure via the sheet-shaped elastic material, there is no need to integrate the sheet-shaped elastic material and the lattice-shaped reinforcing material and the structure, and foreign matter such as dust from the surface of the structure. There is no need to perform a surface treatment to remove the. Furthermore, if the lattice-shaped reinforcing material is wound around the structure via the sheet-shaped elastic material, the structure can be reinforced by the sheet-shaped elastic material and the lattice-shaped reinforcing material.

  In the reinforcing structure for a structural body according to claim 3 of the present invention, the plate-like protective member is provided outside the lattice-like reinforcing material so as to cover the lattice-like reinforcing material. It is possible to prevent collision with the lattice reinforcing material.

  Embodiments of a reinforcing structure for a structure according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a side view showing a reinforcing structure of a structure according to the present invention, and FIG. 2 is a cross-sectional plan view taken along line AA in FIG.

  A structure reinforcing structure 10 according to the present invention includes a structure 11, a rubber material (sheet-like elastic material) 12, and a net material (lattice-like reinforcing material) 13.

  The structure 11 is for constructing, for example, a lower structure of a bridge, and a masonry structure in which bricks 14 are stacked to form a joint while forming a mortar 15 between the bricks 14 and 14. The body is over 70 years old. Such a structure 11 may have joints with low strength from the beginning, and may have joints with reduced strength due to deterioration, i.e. joints with reduced strength. is there.

  In order to prevent brittle fracture from occurring in the structure 11 due to having joints with low strength or joints with reduced strength, a rubber material 12 and a net material are provided around the structure 11. 13 is provided.

  The rubber material 12 is formed in a sheet shape so as to cover the periphery of the structure 11, and has a sufficient thickness to reinforce the structure 11.

  As shown in FIGS. 3 and 4, for example, the net member 13 is configured such that a plurality of longitudinal strands 16 arranged in parallel and a plurality of transverse strands 17 arranged in parallel intersect each other at a right angle. 12 is formed in a band shape so as to cover the periphery of the structure 11. In the illustrated net member 13, the distance between the vertical strand 16 and the horizontal strand 17 is equal, and the thickness is approximately equal.

  The net material 13 is made of, for example, a synthetic polymer such as polypropylene or polyethylene, and is stretched in two directions, the longitudinal direction and the transverse direction, while heating the sheet-like synthetic polymer having holes provided at regular intervals. It is manufactured.

  As shown in FIG. 5, the net member 13 is arranged so that one side end and the other side end overlap each other, and the lateral strand 17 a at one side end arranged on the lower side includes the structure 11 and the winding. The periphery of the structure 11 is covered by providing the winding rod 18 so that the lateral strand 17b on the other side end disposed on the upper side is between the structure 11 and the winding rod 18. It is wrapped like so.

  According to the reinforcing structure 10 of the structure according to this embodiment, since the net material 13 is wound via the rubber material 12 having a predetermined thickness so as to cover the periphery of the structure 11, the rubber material 12 and the net material 13 are The structure 11 can be reinforced to reduce the possibility of the structure 11 being destroyed due to having joints with low strength and joints with reduced strength. Furthermore, since the net member 13 is wound around the structure 11 via the rubber member 12, there is no need to integrate the rubber member 12, the net member 13, and the structure 11, and foreign matter such as dust from the surface of the structure 11. There is no need to perform a surface treatment to remove the. Therefore, since it is not necessary to perform a surface treatment for removing foreign substances from the surface of the structure 11, a structure reinforcement structure that can be easily reinforced can be provided. Moreover, if the net member 13 is wound around the structure 11 via the rubber member 12, the structure 11 can be reinforced. Therefore, as shown in FIG. 12, the reinforcing bar 2b is provided outside the structural body 1 so as to surround the structural body 1, and the form having a support work is provided around the structural body 1 outside the reinforcing bar 2b. Concrete is placed between the structure 1 and the reinforcing bar 2b, and between the reinforcing bar 2b and the formwork, and the two steel plates 5a and 5b are structured so as to surround the structure 1 as shown in FIG. Since it is unnecessary to dispose outside the body 1 and to fill the mortar 7 between the structure 1 and the steel plates 5a and 5b, the construction period can be shortened. In addition, since it is reinforced by the rubber material 12 and the net material 13, the structure 11 reinforced has elasticity, and does not cause brittle fracture when an external force is applied due to an earthquake or the like. In addition, since it is reinforced by the rubber material 12 and the net material 13, the cross-sectional area does not increase so as to affect the outside, for example, affecting the river volume inhibition rate. Of course, the structure reinforcing structure 10 according to this embodiment does not need to tear down the structure 11 and does not need to form a new structure from scratch, so that the existing structure is reinforced concrete. The construction cost can be reduced as compared with the case where the structure is replaced. In addition, since it is not necessary to tear down the structure 11, if the structure 11 has historical value, it can be preserved.

  When the reinforcing structure 1 of the structure 1 using the reinforced concrete winding method shown in FIG. 12 is compared with the reinforcing structure 10 of the structure according to this embodiment, there are the following differences.

  Since the reinforcing structure of the structure 1 using the reinforced concrete winding method shown in FIG. 12 uses the reinforcing bars 2a and 2b, a lifting machine such as a chain block or a crane is required. Furthermore, it is necessary to provide a scaffold for placing the concrete 3. Moreover, since the reinforcing bars 2a and 2b and the concrete 3 are used, the weight increases, and if necessary, the foundation must be reinforced in response to the increase in weight. In addition, in order to ensure the covering of the reinforcing bar 2b, the cross-sectional area may increase so as to affect the external environment, for example, affecting the river volume inhibition rate. Furthermore, a process such as chipping of the structure 1 is required so that the old and new materials, that is, the structure 1 and the reinforced concrete 4 are integrated. Furthermore, it is necessary to cast the concrete 3 on the outside of the reinforcing bar 2b so that cracks do not occur.

  On the other hand, the reinforcing structure 10 of the structure according to this embodiment only uses the rubber material 12 and the net material 13, and since these are lightweight, there is no need for a lifting machine and no need to provide a scaffold. . Of course, since the rubber material 12 and the net material 13 are lightweight, the situation where the foundation must be reinforced does not occur. In addition, since the net member 13 is simply wrapped around the rubber member 12 so as to cover the periphery of the structure 11, the cross-sectional area increases as it affects the external environment, such as affecting the river volume inhibition rate. I don't have to. Furthermore, since the net material 13 is wound through the rubber material 12 so as to cover the periphery of the structure 11, a step such as chipping the structure 11 is not required. Furthermore, since there is no need to use concrete, there is no need to cast concrete so that cracks do not occur.

  In addition, even if it excludes the expense which provides a scaffold, the expense of the reinforcement structure 10 of the structure concerning this embodiment is cheaper than the expense of the reinforcement structure of the structure 1 using a reinforced concrete winding method.

  Moreover, when the reinforcing structure of the structure 1 using the steel sheet winding method shown in FIG. 13 is compared with the reinforcing structure 10 of the structure according to this embodiment, there are the following differences.

  Since the reinforcing structure of the structure 1 using the steel sheet winding method shown in FIG. 13 uses the steel plates 5a and 5b, a lifting machine is required. Moreover, it is necessary to protect the steel plates 5a and 5b from corrosion. Furthermore, there is no gap between the structure 1 and the steel plates 5a and 5b, and it is necessary to fill the mortar so that the steel plates 5a and 5b do not protrude.

  On the other hand, the reinforcing structure 10 of the structure according to the present embodiment uses only the rubber material 12 and the net material 13, and since these are lightweight, no lifting machine is required. Moreover, since the raw material of the net material 13 is polypropylene or polyethylene and these have corrosion resistance, there is no need to prevent corrosion. Furthermore, since there is no need to use mortar, there is no gap, and there is no need to fill the mortar so that the steel sheet does not protrude.

  Note that the cost of the structure reinforcing structure 10 according to this embodiment is lower than the cost of the reinforcing structure of the structure 1 using the steel sheet winding method.

  Moreover, when the reinforcement structure of the structure 1 using the continuous fiber sheet winding method shown in FIG. 14 and the reinforcement structure 10 of the structure according to this embodiment are compared, there are the following differences.

  The reinforcing structure of the structure 1 using the continuous fiber sheet winding method shown in FIG. 14 is a surface treatment of bricks and joints in order to integrate the old and new materials, that is, the structure 1 and the fiber sheets 8a, 8b, 8c. It is necessary to attach the fiber sheets 8a, 8b, and 8c around the structure 1 with an adhesive. In addition, it is necessary to reliably perform curing until the adhesive is cured. Further, it is necessary to stack and attach expensive fiber sheets 8a, 8b, and 8c around the structure 1.

  On the other hand, the reinforcing structure 10 of the structure according to this embodiment wraps the net material 13 through the rubber material 12 so as to cover the periphery of the structure 11, so that it is not necessary to perform the surface treatment of bricks and joints. Moreover, since it is not necessary to use an adhesive, it is not necessary to perform curing until the adhesive is cured. Furthermore, since only the inexpensive rubber material 12 and net material 13 are used, the cost of the structural reinforcement structure 10 according to this embodiment is the cost of the reinforcement structure of the structural body 1 using the steel sheet winding method. Is cheaper than

  In the above-described embodiment, the structure reinforcing structure 10 included in the lower structure of the bridge has been described. However, the present invention is not limited to this, and can also be applied to reinforcing structures for other structures such as piers and abutments provided in the substructure of highways.

  Moreover, if the rubber material 12 and the net material 13 are each formed using the material which has a light transmittance, the structure 11 can be visually recognized from the outside.

  Furthermore, in embodiment mentioned above, the net material 13 with the thickness of the horizontal strand 17 and the vertical strand 16 substantially equal demonstrated. However, the present invention is not limited to this, and for example, as shown in FIG. 6, a net material 13a in which the thickness of the longitudinal strand 16c is larger than the thickness of the lateral strand 17c may be used.

  In the embodiment described above, as an example of the structure 11, a masonry structure in which the mortar 15 is provided between the bricks 14 and the bricks 14, and the bricks 14 are stacked and formed in a column shape so as to serve as a joint. It explained with the thing which reinforces the body. However, in this invention, the structure 11 is not limited to a masonry structure, and may be an unreinforced concrete structure. Of course, the structure 11 is not limited to the masonry structure in which the bricks 14 are stacked so as to become a joint, and the bricks 14 may be stacked so as to become a joint, for example, and instead of using the bricks 14, stones are used. The masonry structure formed in this way may be reinforced.

  Furthermore, in the above-described embodiment, the net member 13 is wound around the structure 11 by the winding rod 18. However, the present invention is not limited to this, and instead of using the winding rod 18, the net member 13 may be wound around the structure 11 with a clip 19 as shown in FIG. 7.

  In the above-described embodiment, the net material 13 is wound around the rubber material 12 having a predetermined thickness so as to cover the periphery of the structure 11. However, the present invention is not limited to this, and instead of using the rubber material 12, only the net material 13 may be attached so as to surround the structure 11 several times so as to reinforce the structure 11.

  Further, although not shown, a plate-like protective member such as a precast concrete panel may be provided outside the net member 13 so as to cover the net member 13. Thus, if a plate-shaped protection member is provided, it is possible to prevent an object such as a rock from colliding with the net member 13.

  FIG. 8 shows an experiment conducted by the present inventors, that is, a masonry structure 11a in which bricks 14 are stacked to form a joint while forming mortar 15 between bricks 14 and 14 to form a pillar shape. And reinforced the masonry structure by wrapping the net material 13 through the rubber material 12 so as to cover the periphery of the masonry structure 11a having the same shape (the structure according to the present invention is applied to the masonry structure 11a). 11b to which the body reinforcement structure is applied) and the load applied to them.

  In this experiment, as shown in FIG. 9, the masonry structure 11a and the assembled structure 11a and the masonry structure 11a and the masonry structure 11b are reinforced so that the axis of the column is substantially horizontal. Support bases 20a and 20b are arranged at the upper and lower parts of the reinforcing structure 11b, and two load arms 21a and 21b are arranged near the center of the pillar, respectively. A load was applied to the vicinity of the center of the structure 11b reinforced with the masonry structure.

  In this experiment, the net material 13 used was one in which the longitudinal strands 16 and the lateral strands 17 shown in FIGS. This net member 13 is manufactured by stretching a polypropylene sheet having holes at regular intervals while stretching in two directions, the longitudinal direction and the transverse direction, and is a belt-like shape having a width of 3.5 m and a roll length of 30 m. The pitch interval of the transverse strands 17 is 33 mm, the pitch interval of the longitudinal strands 16 is 28 mm, and the thickness of the intersection between the longitudinal strands 16 and the transverse strands 17 is 4.2 mm. When the tensile strength of the net member 13 was investigated by JIS L 1908 “Geotextile Test Method”, the tensile strength in the longitudinal direction was 34.0 kN, and the tensile strength in the transverse direction was 43.0 kN.

  As shown in FIG. 8, the masonry structure 11a was broken into two along the joint as shown in FIG. 10 when a load of about 35 kN was applied.

  As shown in FIG. 8, the structure 11b reinforced with the masonry structure was bent so that the vicinity of the center was convex downward as shown in FIG. 11 when a load of about 60 kN was applied. It was able to withstand a load of approximately 16 kN even after bending.

  From this experiment, it was confirmed that the masonry structure 11b reinforced with this invention can withstand a load approximately 1.7 times that of the masonry structure 11a. Moreover, it can be confirmed that brittle fracture occurs in the masonry structure 11a, whereas the masonry structure 11b reinforced with the masonry structure according to the present invention does not cause brittle fracture and causes elastic fracture. It was.

It is a side view which shows the reinforcement structure of the structure concerning this invention. It is a cross-sectional top view in the AA line in FIG. It is explanatory drawing which shows an example of the net material wound so that the circumference | surroundings of a structure may be covered. It is sectional drawing in the BB line in FIG. It is explanatory drawing which shows the winding to the structure of a net material. It is explanatory drawing which shows the other example of a net | network material. It is explanatory drawing which shows winding a net material around a structure with a clip. The graph which shows the relation between the load applied to the masonry structure according to the present invention and the center displacement due to the load, and the relation between the load applied to the masonry structure and the center displacement due to the load, respectively. It is. It is explanatory drawing which shows the experiment conducted in order to obtain the graph shown in FIG. It is explanatory drawing which shows when a masonry structure is broken. It is explanatory drawing which shows when the thing which strengthened the masonry structure (thing which applied the reinforcement structure of the structure concerning this invention to the masonry structure) bent. It is a cross-sectional top view which shows the reinforcement structure of the structure using the conventional reinforced concrete winding method. It is a cross-sectional top view which shows the reinforcement structure of the structure using the conventional steel plate winding method. It is a cross-sectional top view which shows the reinforcement structure of the structure using the conventional continuous fiber sheet winding method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Structure reinforcement structure 11 Structure 12 Rubber material (sheet-like elastic material)
13 Net material (lattice reinforcement)

Claims (3)

  A reinforcing structure for a structural body, wherein a lattice-shaped reinforcing material is wound around the structural body.   The reinforcing structure for a structural body according to claim 1, wherein a lattice-shaped reinforcing material is wound through a sheet-like elastic material so as to cover the structural body. The reinforcing structure for a structure according to claim 1 or 2, wherein a plate-shaped protection member is provided outside the lattice-shaped reinforcing material so as to cover the lattice-shaped reinforcing material.

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