JP7263164B2 - How to repair wall balustrades - Google Patents

Description

The present invention relates to a method for repairing wall balustrades.

Deteriorating factors such as chloride ions enter from the surface of the wall balustrade of road bridges due to the spraying of anti-freezing agents, etc., and the reinforcing bars and concrete of the wall balustrade may deteriorate. For this reason, for example, Patent Document 1 discloses a method for repairing an existing wall balustrade. In the technique of Patent Literature 1, the surface layer of the repaired portion of the existing wall balustrade is scraped off. A repair panel made of precast concrete is installed spaced from the stripped balustrade. The wall balustrade is repaired by filling mortar between the wall balustrade from which the surface layer has been scraped off and the repair panel and solidifying the mortar.

Japanese Patent No. 5688937

By the way, there is a demand for further improvement in the durability of wall balustrades after repair.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for repairing a wall balustrade that can improve the durability of the repaired wall balustrade.

The present invention is a wall balustrade repair comprising a scraping step of scraping off the surface layer of an existing wall balustrade, and a casting step of placing fiber reinforced concrete on the surface layer of the wall balustrade scraped off in the scraping step. The method.

According to this configuration, the surface layer of the existing wall balustrade is scraped off in the scraping process, and fiber-reinforced concrete having excellent durability is cast in the surface layer of the wall balustrade scraped off in the scraping process in the casting process. Therefore, the durability of the repaired wall balustrade can be improved.

In this case, a reinforcing bar arrangement step is further provided in which reinforcing bars are arranged on the surface layer of the wall balustrade that has been scraped off in the scraping process. , it is preferable to pour fiber-reinforced concrete.

According to this configuration, in the bar arranging step, reinforcing bars are arranged on the surface layer portion of the wall balustrade that has been scraped off in the plucking step, and in the placing step, the surface layer of the wall balustrade on which the reinforcing bars have been arranged in the bar arranging step. Since fiber reinforced concrete is placed in the part, the load-bearing capacity of the repaired wall balustrade can be further improved.

Further, in the placing step, in a cross-sectional view of a longitudinal section parallel to the width direction of the lane, the first surface extends upward while making a first angle with respect to the road surface, and from the upper end of the first surface Fiber reinforced concrete is poured on the surface layer of the wall balustrade so as to form a wall balustrade having a second surface that bends and extends upward while forming a second angle larger than the first angle with respect to the road surface. may be set.

According to this configuration, in the placing step, in a cross-sectional view of a longitudinal section parallel to the width direction of the lane, the first surface extending upward while forming the first angle upward with respect to the road surface, and the first surface and a second surface that bends from the upper end and extends upward while forming a second angle larger than the first angle with respect to the road surface. Since the reinforcing concrete is placed, it is possible to reduce the contact energy when the vehicle contacts the wall balustrade, and increase the possibility of guiding the vehicle to the lane again.

In addition, in the scraping process, a part of the surface layer of the wall balustrade is scraped off, and the part of the surface layer of the wall balustrade scraped off in the scraping process and the surface layer of the wall balustrade that is not scraped off in the scraping process The boundary between the wall balustrade and the other part includes a redundant part that extends from the surface of the wall balustrade vertically to the inside of the wall balustrade while being inclined with respect to either the vertical direction or the wall balustrade. The superficial layer may be scraped off.

According to this configuration, a part of the surface layer portion of the wall balustrade is scraped off in the scraping step, and the part of the surface layer portion of the wall balustrade scraped off in the scraping step and the surface layer portion of the wall railing scraped off in the scraping step are scraped off. The boundary between the surface layer of the wall balustrade and the other part includes a redundant part that extends from the surface of the wall balustrade vertically to the inside of the wall balustrade while being inclined with respect to one of the vertical directions. Thus, since the surface layer of the wall balustrade is scraped off, the path through which water or the like enters is lengthened, and the durability of the repaired wall balustrade can be further improved.

In addition, in the scraping process, a part of the surface layer of the wall balustrade is scraped off, and the part of the surface layer of the wall balustrade scraped off in the scraping process and the surface layer of the wall balustrade that is not scraped off in the scraping process A coating process is further provided to apply resin to the boundary with other parts, and in the casting process, fiber reinforced concrete is cast on a part of the surface layer of the wall balustrade that has been coated with resin at the boundary in the coating process. may

According to this configuration, in the scraping process, a part of the surface layer of the wall balustrade is scraped off, but in the coating process, the part of the surface layer of the wall balustrade scraped off in the scraping process and the surface layer part of the wall balustrade scraped off in the scraping process are scraped off. Resin is applied to the boundary with other parts of the surface layer of the wall balustrade that has not been removed. Since the concrete is placed, the water resistance of the path through which water or the like penetrates can be increased, and the durability of the repaired wall balustrade can be further improved.

According to the method for repairing the wall balustrade of the present invention, the durability of the repaired wall balustrade can be improved.

It is a perspective sectional view by the longitudinal section parallel to the width direction of the lane which shows the wall balustrade in which the repair method of the wall balustrade based on embodiment is performed. FIG. 2 is a perspective cross-sectional view showing a state in which the wall balustrade shown in FIG. 1 is subjected to a picking process; FIG. 3 is a perspective cross-sectional view showing a state in which a bar arrangement process has been performed on the wall balustrade shown in FIG. 2 ; 4 is a perspective cross-sectional view showing a state in which a coating process has been performed on the wall balustrade shown in FIG. 3; FIG. FIG. 5 is a perspective cross-sectional view showing a state in which the wall balustrade shown in FIG. 4 is subjected to a placing step; 1. It is perspective sectional drawing which shows the state by which the picking process was performed also on the whole surface of the top end of the wall balustrade shown in FIG. FIG. 7 is a perspective cross-sectional view showing a state in which the wall balustrade shown in FIG. 6 has undergone a bar arrangement process, a coating process, and a placing process.

Hereinafter, an embodiment of a method for repairing a wall balustrade according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the balustrade 1 on which the method of repairing the balustrade of the present embodiment is performed is provided at both ends in the width direction Y of the lane 100 of the floor slab 30 of the road bridge. A reinforcing bar 2 is arranged inside the concrete 3 of the wall balustrade 1. - 特許庁The surface 14 of the balustrade 1 is perpendicular to the road surface 110 when a pavement surface is formed on the floor slab 30 indicated by the dashed line in the cross-sectional view of the longitudinal section parallel to the width direction Y of the lane 100. extending upward at an angle. That is, the wall balustrade 1 is a straight wall type.

In this embodiment, deterioration factors such as chloride ions enter from the surface of the wall balustrade 1 due to the spraying of an anti-freezing agent or the like, the reinforcing bars 2 and the concrete 3 of the wall balustrade 1 deteriorate, and the wall balustrade 1 is partially repaired. applied when 1 to 5, the lane direction X, the width direction Y of the lane 100, and the vertical direction Z are shown.

First, the degree of deterioration of the wall balustrade 1 is diagnosed by an electron probe microanalyzer (EPMA: Electron Probe MicroAnalyzer) test, a core extraction test, etc., and the portion to be repaired of the wall balustrade 1 and the width direction Y of the lane 100 to be repaired thickness is set. As shown in FIG. 2, a scraping process is performed to scrape off the surface layer portion 4 of the existing wall balustrade 1 . The picking process is performed by, for example, a water jet or the like. In the scraping process, a part 11 of the surface layer portion 4 of the balustrade 1 is scraped off. A part 11 of the surface layer 4 of the wall balustrade 1 that has been stripped includes the set portion of the wall balustrade 1 to be repaired, and has a thickness greater than the set thickness in the width direction Y of the lane 100 to be repaired. are taken.

In the plucking process, the boundary part 13 between the part 11 of the surface layer part 4 of the wall balustrade 1 that has been stripped off in the plucking process and the other part 12 of the surface layer part 4 of the wall balustrade 1 that has not been stripped off in the plucking process , a direction from the surface 14 of the wall balustrade 1 to the inside of the wall balustrade 1 (for example, the width direction Y of the lane 100) and a redundant portion 15 extending while being inclined with respect to the vertical direction Z. The surface layer 4 of the balustrade 1 is scraped off. That is, the redundant portion 15 of the boundary portion 13 does not extend vertically from the surface 14 of the wall balustrade 1 to the inside of the wall balustrade 1 and the shortest distance along the vertical direction Z. In this embodiment, the redundant portion 15 has an irregular uneven surface that is scraped off by a water jet.

In addition, the redundant portion 15 may extend from the surface 14 of the wall balustrade 1 vertically to the inside of the wall balustrade 1 while being inclined with respect to only one of the direction Z and the vertical direction Z. Also, the redundant portion 15 may be included only in part of the boundary portion 13 . Further, the redundant portion 15 may be a plane that is inclined with respect to either the direction extending vertically from the surface 14 of the wall balustrade 1 to the inside of the wall balustrade 1 or the vertical direction Z. In addition, the redundant portion 15 has a regular shape including a portion that is inclined with respect to either the direction extending vertically from the surface 14 of the wall balustrade 1 to the inside of the wall balustrade 1 or the vertical direction Z. good too.

As shown in FIG. 3, a reinforcement arrangement step is performed to arrange reinforcing bars 5 and 6 on the surface layer portion 4 of the balustrade 1 that has been removed in the removal step. In the reinforcing bar arrangement step, reinforcing bars are arranged in accordance with the shape of concrete after hardening that is placed in the placing step described later. The reinforcing bars 5 and 6 include portions that serve as anchor bars embedded in the floor slab 30 . For simplification of explanation, only some of the reinforcing bars 5 and 6 are illustrated. Moreover, a resin such as an epoxy resin may be applied to the surfaces of the existing reinforcing bars 2 and the reinforcing bars 5 and 6 arranged in the reinforcing bar arrangement process. Further, in the bar arrangement step, reinforcing bars or the like formed from carbon fiber reinforced plastics (CFRP) may be arranged.

As shown in FIG. 4, a boundary between a portion 11 of the surface layer portion 4 of the wall balustrade 1 that has been scraped off in the scraping process and the other portion 12 of the surface layer portion 4 of the wall balustrade 1 that has not been scraped off in the scraping step. A coating step of coating the resin 16 on the portion 13 is performed. Epoxy resin, for example, can be applied to the resin 16 . Note that either the bar arrangement process or the application process may be performed first, or either may be performed later. Alternatively, the scraping step may be performed so that the continuous boundary portion 13 surrounds the portion 11 , and the coating step may be performed on the boundary portion 13 .

As shown in FIG. 5, a placing process is performed to place fiber reinforced concrete 20 on the surface layer 4 of the balustrade 1 that has been skimmed off in the skimming process. The fiber-reinforced concrete 20 is concrete in which synthetic fibers, steel fibers, and the like are combined. The placing process is performed by, for example, plastering work and spraying work. In the placing step, fiber reinforced concrete is placed on the surface layer portion 4 of the balustrade 1 to which the reinforcing bars 5 and 6 have been placed in the reinforcing step. In the placing step, the fiber reinforced concrete 20 is placed in the portion 11 of the surface layer portion 4 of the balustrade 1 to which the resin 16 has been applied to the boundary portion 13 in the coating step.

For the fiber reinforced concrete 20, for example, ultrahigh strength fiber reinforced concrete (UFC) may be applied. An example of the properties of ultra-high strength fiber reinforced concrete will be described below. This ultra-high-strength fiber-reinforced concrete is obtained by hardening a mixture containing, for example, cement, aggregate, mixing water, a chemical admixture for concrete, and reinforcing fibers. Said cements are, for example, ordinary Portland cement, high-early-strength Portland cement, moderate-heat Portland cement, sulfate-resistant Portland cement, or low-heat Portland cement.

As an example, the above-mentioned aggregate has a particle size of 2.5 mm or less, an absolute dry density of 2.5 g/cm ³ or more, a water absorption of 3.0% or less, a clay lump content of 1.0% or less, and a fine particle content of 2.0%. Hereinafter, aggregates having a NaCl content of 0.02% or less are used. This aggregate was judged to be "pale" in the test result of organic impurities according to the organic impurity test method for fine aggregate specified in JISA 1105. In addition, this aggregate has a stability of 10% or less according to the stability test method for aggregates with sodium sulfate specified in JIS A 1122, and the alkali silica reactivity specified in JISA 5308 Annex 1. It is an aggregate whose division by is division A.

The above-mentioned kneading water is, for example, kneading water other than the recovered water specified in JSCE-B 101-2005. The above chemical admixture for concrete is a high performance water reducing agent specified in JISA 6204. Further, the above reinforcing fibers are fibers having a diameter of 0.1 to 0.25 mm, a length of 10 to 24 mm, and a tensile strength of 2×10 ³ N/mm ^{2 or} more. The reinforcing fibers mentioned above may be, for example, steel fibres, high strength aramid fibres, high density polyethylene fibres, or carbon fibres.

The ultra-high-strength fiber-reinforced concrete, for example, the matrix is composed of a binder consisting of Portland cement, a pozzolanic material, and an etrin guide-generating material, an aggregate having a particle size of 2.5 mm or less, water, and a water reducing agent. there is In addition, the reinforcing fibers are steel fibers with a diameter of 0.2 mm and a length of 15 mm (manufacturing error of less than ±2 mm) and a tensile strength of 2 × 10 ³ N/mm ² or more, and a diameter of 0.2 mm and a length of 22 mm (manufacturing error of less than ±2 mm) and tensile strength of 2×10 ³ N/mm ² or more. % may be mixed. In addition, the characteristic values of the ultra-high-strength fiber-reinforced concrete after hardening are compression strength of 150 N/mm ² or more, crack initiation strength of 4 N/mm ² or more, tensile strength of 5 N/mm ^{2 or} more, and hydraulic conductivity of 1 × 10 ^-11 cm/. s, a chloride ion diffusion coefficient of less than 0.14 cm ² /year, and an abrasion coefficient of less than 240 mm ³ /cm ² .

The standard formulation of ultra-high-strength fiber-reinforced concrete is a flow value of 250 ± 20 mm, a mixing water ratio of 15% to the binder, an air content of 2.0%, a mixing water of 195 kg/m ³ , and a binder of 1287 kg/m. ³ , aggregate 905 kg/m ³ , superplasticizer 32.2 kg/m ³ , and reinforcing fiber 137.4 kg/m ³ (1.75 vol.%).

In the placing step, in a cross-sectional view of a longitudinal section parallel to the width direction Y of the lane 100, the first surface 21 extending upward while forming a first angle θ1 upward with respect to the road surface 110, and the first surface 21 The wall balustrade 1 is formed so as to have a second surface 23 that bends from an upper end 22 and extends upward while forming a second angle θ2 larger than the first angle θ1 with respect to the road surface 110 . A fiber reinforced concrete 20 is placed on the surface layer 4 of the balustrade 1 . In other words, in this embodiment, the wall balustrade is repaired from the straight wall type to the Florida type.

According to this embodiment, the surface layer part 4 of the existing wall balustrade 1 is scraped off by the scraping process, and the surface layer part 4 of the wall balustrade 1 scraped off by the scraping process is excellent in durability by the casting process. Since the fiber reinforced concrete 20 is placed, the durability of the repaired wall balustrade 1 can be improved.

Further, according to the present embodiment, the reinforcing bars 5 and 6 are arranged in the surface layer portion 4 of the wall balustrade 1 that has been scraped off in the scraping process, and the reinforcing bars 5 and 6 are arranged in the reinforcing bar arrangement process in the placing process. , 6 are placed on the surface layer 4 of the wall balustrade 1, the load-bearing capacity of the repaired wall balustrade 1 can be further improved.

In addition, according to the present embodiment, in the placing step, in a cross-sectional view of a longitudinal section parallel to the width direction Y of the lane 100, the first angle .theta. A wall having a first surface 21 and a second surface 23 that bends from an upper end 22 of the first surface 21 and extends upward while forming a second angle θ2 larger than the first angle θ1 with respect to the road surface 110. Since the fiber reinforced concrete 20 is placed on the surface layer 4 of the wall balustrade 1 so as to form the balustrade 1, the energy of contact when the vehicle contacts the wall balustrade 1 can be reduced, and the vehicle can be moved to the lane 100 again. You can increase the possibility of induction.

Further, according to the present embodiment, the part 11 of the surface layer part 4 of the wall balustrade 1 is scraped off in the scraping process, but the part 11 of the surface layer part 4 of the wall balustrade 1 scraped off in the scraping process , the boundary part 13 between the surface layer part 4 of the wall balustrade 1 and the other part 12, which is not scraped off in the scraping process, extends vertically from the surface 14 of the wall balustrade 1 to the inside of the wall balustrade 1 and in the vertical direction Z Since the surface layer part 4 of the wall balustrade 1 is scraped off so as to include the redundant part 15 extending while being inclined with respect to any direction, the route for water or the like to enter is lengthened, and the repaired wall balustrade 1 can be further improved in durability.

Further, according to the present embodiment, a part 11 of the surface layer part 4 of the wall balustrade 1 is scraped off in the scraping process, but the surface layer part 4 of the wall balustrade 1 scraped off in the scraping process is removed by the coating process. A resin 16 is applied to the boundary part 13 between the part 11 and the other part 12 of the surface layer part 4 of the wall balustrade 1 that is not scraped off in the scraping process. Since the fiber reinforced concrete 20 is placed in a part of the surface layer 4 of the wall balustrade 1 to which 16 is applied, the water resistance of the path through which water or the like enters is increased, and the repaired wall balustrade 1 is further durable. can be improved.

The present invention can be embodied in various forms with various modifications and improvements based on the knowledge of those skilled in the art, including the embodiment described above. Moreover, it is also possible to configure a modified example using the technical matters described in the above-described embodiments. For example, either the bar arrangement step or the application step may be omitted. Further, in the scraping step, the entire surface layer of the wall balustrade may be scraped off, and in the placing step, fiber reinforced concrete may be placed in the entire surface layer of the wall balustrade. Moreover, the redundant portion 15 may not be provided in the picking process. Further, the wall balustrade 1 before the repair method of the wall balustrade 1 of the present embodiment is performed is a straight wall type, and the wall balustrade 1 after the repair method of the wall balustrade 1 of the present embodiment is performed is a straight wall type. It's okay. Moreover, the wall balustrade 1 before the repair method of the wall balustrade 1 of the present embodiment is performed may be of the Florida type, and the wall balustrade 1 after the repair method of the wall balustrade 1 of the present embodiment may be of the Florida type. . The balustrade 1 before the repair method of the balustrade 1 of the present embodiment is performed may be of the Florida type, and the balustrade 1 after the repair method of the balustrade 1 of the present embodiment may be of the straight wall type. Further, as shown in FIG. 6, the entire surface of the top end of the wall balustrade 1 was also subjected to the squeezing process in the same manner as in the above-described embodiment, and as shown in FIG. The wall balustrade 1 may be subjected to the bar arrangement process, the coating process and the placing process in the same manner as in the above-described embodiment.

DESCRIPTION OF SYMBOLS 1... Wall balustrade, 2... Reinforcing bar, 3... Concrete, 4... Surface layer part, 5, 6... Reinforcement bar, 11... One part, 12... Other part, 13... Boundary part, 14... Surface, 15... Redundant part, 16... Resin 20 Fiber reinforced concrete 21 First surface 22 Upper end 23 Second surface 30 Floor slab 100 Lane 110 Road surface X Lane direction Y Width direction Z Vertical direction, θ1... first angle, θ2... second angle.

Claims (3)

A scraping process of scraping off the surface layer of the existing wall balustrade;
A bar arranging step of arranging reinforcing bars in the surface layer portion of the wall balustrade that has been scraped off in the scraping step;
a placing step of placing fiber reinforced concrete on the surface layer portion of the wall balustrade that has been scraped off in the scraping step and the reinforcing bars have been arranged in the bar arrangement step;
with
In the placing step, in a cross-sectional view of a longitudinal section parallel to the width direction of the lane, a first surface extending upward while making a first angle with respect to the road surface, and from the upper end of the first surface and a second surface extending upward while bending to form a second angle larger than the first angle with respect to the road surface. Casting the fiber reinforced concrete,
In the bar arrangement process,
A wall balustrade, wherein the new reinforcing bars are arranged according to the shapes of the first surface and the second surface, and the ends of the new reinforcing bars are fixed to the existing reinforcing bars exposed in the squeezing process. Repair method. In the picking process,
A part of the surface layer of the wall balustrade is scraped off,
A boundary portion between a portion of the surface layer portion of the wall balustrade that has been scraped off in the scraping step and the other portion of the surface layer portion of the wall balustrade that has not been scraped off in the scraping step is the boundary portion of the wall balustrade. 2. The surface part of the wall balustrade is scraped off so as to include a redundant part extending from the surface perpendicularly to the inside of the wall balustrade while being inclined with respect to either one of the direction and the vertical direction . The method for repairing the wall balustrade described in . In the scraping step, a part of the surface layer portion of the wall balustrade is scraped off,
Coating for applying a resin to a boundary portion between a portion of the surface layer portion of the wall balustrade that has been skimmed off in the skidding step and the other portion of the surface layer portion of the wall balustrade that has not been skimmed off in the skidding step. Equipped with further processes,
3. The wall balustrade according to claim 1 or 2, wherein in the placing step, the fiber reinforced concrete is placed in a part of the surface layer portion of the wall balustrade to which the resin has been applied to the boundary portion in the applying step. Repair method.

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