JP2021167515A - Pavement structure construction method and pavement replacement method - Google Patents

Abstract

To provide a pavement structure construction method capable of shortening a construction time, suppressing water leakage from a seam, and preventing damage to an upper structure even when a pavement is replaced.SOLUTION: A pavement structure construction method includes: a waterproofing step of providing a waterproof layer 2 including a cement-based material layer 21 composed of at least a cement-based material on an upper surface of a concrete upper structure A having a seam J; and a surface layer step of providing a surface layer 3 made of an asphalt-based material on an upper surface of the waterproof layer 2 provided in the waterproofing step.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method of constructing a pavement structure and a method of replacing pavement.

Bridges are provided with superstructures such as bridge girders and decks on substructures such as piers and abutments, and pavement on which vehicles and the like travel is provided above the superstructures. The conventional pavement method is constructed by applying a resin-based waterproof material to the upper surface of the superstructure, providing a base layer of the asphalt-based material on the upper surface of the applied waterproof material, and providing a surface layer of the asphalt-based material on the upper surface of the base layer. Will be done.

However, such a conventional pavement method has a problem that it is necessary to provide a surface layer after providing a base layer, and it takes time for construction. Further, in the conventional pavement method, there is a possibility that an air reservoir is generated when the waterproof material is applied, the adhesion between the waterproof material and the superstructure cannot be ensured, and there is a risk that moisture permeates into the superstructure. .. In particular, in a concrete superstructure having a seam, there is a risk that water may leak from the seam due to the permeation of water.

Further, in the pavement constructed by the conventional pavement method, it is necessary to appropriately replace the base layer and the surface layer in which the asphalt-based material is used. At this time, by cutting the base layer and the surface layer provided on the upper surface of the superstructure, the waterproof material applied to the upper surface of the superstructure and the superstructure itself are also cut, which is necessary for the superstructure. Not only could it not exhibit waterproof performance, but the superstructure itself could be damaged.

Conventionally, a method for constructing a concrete structure disclosed in Patent Document 1 has been proposed as a method for more reliably suppressing the infiltration of water into a concrete deck.

The concrete structure construction method disclosed in Patent Document 1 is a concrete structure construction method in which a pavement layer is provided on the upper part of the concrete slab, and an epoxy resin adhesive is applied to the upper surface of the concrete slab. It includes a step of forming an adhesive layer, a step of forming a fiber-reinforced cement composite material layer on the upper surface of the adhesive layer, and a step of forming an asphalt layer as a pavement layer on the upper surface of the fiber-reinforced cement composite material layer. At this time, in the construction method of the concrete structure disclosed in Patent Document 1, a fiber reinforced cement composite material layer is formed on the concrete floor slab without installing a waterproof layer, and the fiber reinforced cement composite material layer is formed. It is said that water permeation to the concrete floor slab can be prevented.

However, the construction method of the concrete structure disclosed in Patent Document 1 is applied only to the concrete deck slab, and no disclosure or suggestion is made regarding the application to the superstructure having a seam. .. Further, although the concrete structure construction method disclosed in Patent Document 1 includes a step of forming an asphalt layer as a pavement layer on a fiber reinforced cement composite material layer, what kind of relationship is the asphalt layer between the base layer and the surface layer? It is unknown whether it is located in, and it does not shorten the construction time.

Japanese Unexamined Patent Publication No. 2015-129393

Therefore, the present invention has been devised in view of the above-mentioned problems, and the purpose of the present invention is to shorten the construction time, suppress water leakage from the seams, and pave the pavement. It is an object of the present invention to provide a pavement structure construction method and a pavement replacement method capable of preventing damage to the superstructure at the time of replacement.

The method for constructing the pavement structure according to the first invention includes a waterproofing step of providing a waterproof layer including a cement-based material layer composed of at least a cement-based material on the upper surface of a concrete superstructure having a seam, and the waterproofing. It is characterized by including a surface layer step of providing a surface layer made of an asphalt-based material on the upper surface of the waterproof layer provided in the step.

The method for constructing the pavement structure according to the second invention is the method of constructing the pavement structure according to the first invention, in the waterproofing step, the cement-based material layer, the resin-based material layer composed of the resin-based material on the upper surface of the cement-based material layer, and the resin-based material layer. It is characterized in that the waterproof layer including the above is provided.

The method for constructing the pavement structure according to the third invention is the method of constructing the pavement structure according to the second invention, in the waterproofing step, on the upper surface of the superstructure in which a concrete box girder material in which a steel material extending in the vertical direction is embedded in a side wall is used. It is characterized in that the waterproof layer including the cement-based material layer and the sheet-shaped resin-based material layer composed of a resin-based material containing fibers is provided on the upper surface of the cement-based material layer.

The method for constructing the pavement structure according to the fourth invention is the method of constructing the pavement structure according to the first invention or the second invention, in the waterproofing step, on the upper surface of the superstructure having a seam between the concrete girder and the padded concrete. It is characterized by providing a waterproof layer.

The method for constructing a pavement structure according to a fifth invention is the method of applying an adhesive to the upper surface of the superstructure in any of the first to fourth inventions, and the adhesive is applied to the upper surface of the superstructure. The waterproof layer is adhered to the upper surface of the superstructure.

The method for constructing the pavement structure according to the sixth invention is the waterproof layer including the cement-based material layer composed of a non-shrinkable cement-based material in the waterproofing step in any one of the first to fifth inventions. It is characterized by providing.

The method for constructing the pavement structure according to the seventh invention is that in any one of the first to sixth inventions, in the waterproofing step, CaO, which is a kind of calcium aluminate, is formed on the upper surface of the superstructure in which a steel material is embedded. -It is characterized in that the waterproof layer including the cement-based material layer composed of the cement-based material containing _{2AL 2} O _{3 is provided.}

The method for constructing a pavement structure according to an eighth invention is the method according to any one of the first to seventh inventions, wherein in the waterproofing step, the cement-based material layer is reinforced by either one or both of reinforcing bars and fibers. It is characterized by providing a waterproof layer.

The method for constructing a pavement structure according to a ninth invention is characterized in that, in any one of the first to eighth inventions, the waterproof layer including the cement-based material layer which is a precast plate is provided in the waterproof step. ..

The method for constructing a pavement structure according to the tenth invention is characterized in that, in any one of the first to ninth inventions, the waterproof layer including the cement-based material layer reinforced by prestress is provided in the waterproof step. And.

The pavement replacement method according to the eleventh invention leaves the cement-based material layer of the waterproof layer of the pavement structure constructed by the pavement structure construction method according to any one of the first to tenth inventions. It is characterized by including a cutting step of cutting the surface layer and an installation step of providing a new surface layer made of an asphalt-based material on the upper surface of the waterproof layer including the cement-based material layer left in the cutting step. do.

According to the present invention, the surface layer of the asphalt-based material is provided on the upper surface of the cement-based material layer in the surface layer process without providing the base layer composed of the asphalt-based material under the surface layer as in the conventional case. Therefore, according to the present invention, the conventional step of providing the base layer can be omitted, and the construction time can be shortened.

According to the present invention, a surface layer is provided on the upper surface of the waterproof layer including the cement-based material layer. Therefore, according to the present invention, although water permeates from the surface layer due to snow, rain, etc., the cement-based material layer such as concrete, which is more dense than the surface layer, can suppress the permeation of water. As a result, it is possible to suppress the permeation of water to the superstructure, and eventually to prevent water leakage from the joint of the superstructure.

According to the present invention, when the surface layer is cut by a cutting machine or the like at the time of replacing the pavement, the cement-based material layer is left behind, so that it is possible to prevent the superstructure from being damaged. It becomes.

FIG. 1 is a perspective view showing a superstructure in which a method of constructing a pavement structure to which the present invention is applied is carried out. FIG. 2 is a front view showing a pavement structure constructed by a pavement structure construction method to which the present invention is applied. FIG. 3 is an enlarged front view of the pavement structure of FIG. FIG. 4 is a diagram for explaining a procedure for applying an adhesive in a waterproofing step of a pavement structure construction method to which the present invention is applied. FIG. 5 is a diagram for explaining a procedure for providing a waterproof layer in the waterproofing process of the pavement structure construction method to which the present invention is applied. FIG. 6 is a diagram for explaining a procedure for cutting the surface layer of the pavement structure. FIG. 7 is a perspective view showing a form in which a pavement structure constructed by a pavement structure construction method to which the present invention is applied is provided on a superstructure in which a concrete box girder is used. FIG. 8 is an enlarged front view of the pavement structure of FIG. 7. FIG. 9A is an enlarged front view showing a pavement structure in which the surface layer and the resin material layer are cut in the cutting process, and FIG. 9B is a surface layer on the upper surface of the cement material layer in the installation process. It is an enlarged front view which shows the pavement structure provided with.

Hereinafter, a mode for carrying out the construction method of the pavement structure to which the present invention is applied will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing a superstructure A to which a method of constructing a pavement structure to which the present invention is applied is carried out. FIG. 2 is a front view showing a pavement structure 1 constructed by a pavement structure construction method to which the present invention is applied. FIG. 3 is an enlarged front view of the pavement structure of FIG.

The method of constructing a pavement structure to which the present invention is applied is applied to, for example, a superstructure A constructed by placing padded concrete 8 between concrete girders 7.

As shown in FIG. 1, the superstructure A is provided so as to extend in the bridge axis direction X, and a plurality of concrete girders 7 provided at intervals in the bridge axis orthogonal direction Y and adjacent concrete girders 7 are provided with each other. It is composed of padded concrete 8 placed between the two. The superstructure A has a seam J between the concrete girder 7 and the padded concrete 8. The seam J is formed so as to extend in the bridge axial direction X. Here, the bridge axis direction X is the longitudinal direction of the superstructure A, and the bridge axis orthogonal direction Y is the direction orthogonal to the bridge axis direction X, and is the height direction Z.

As shown in FIG. 2, the superstructure A is provided with concrete wall balustrades 9 and the like at both ends in the direction Y orthogonal to the bridge axis. The superstructure A is provided on the upper side of a substructure such as a pier or an abutment (not shown). The concrete girder 7 is a concrete girder having a substantially T-shaped cross section, and a steel material 79 such as a reinforcing bar or a tension material is embedded in the concrete. The concrete girder 7 is not limited to this, and a concrete girder having any cross-sectional shape may be used.

As shown in FIG. 3, a pavement structure 1 is provided on the upper surface of the superstructure A. The pavement structure 1 includes an adhesive 4 provided on the upper surface of the superstructure A, a waterproof layer 2 provided on the upper surface of the adhesive 4, and a surface layer 3 provided on the upper surface of the waterproof layer 2. In the pavement structure 1, a vehicle or the like can run on the upper surface of the surface layer 3.

The waterproof layer 2 has a cement-based material layer 21 made of a cement-based material and a resin-based material layer 22 made of a resin-based material such as urethane resin. The waterproof layer 2 is provided so as to cover the seam J of the superstructure A.

The cement-based material layer 21 is a mortar, concrete, or the like obtained by kneading and hardening water with a cement-based material, and is more dense than the surface layer 3 described later. As the cement-based material layer 21, a cement-based material containing _{CaO · 2AL 2} O _{3 which is one kind of calcium aluminate may be used.} As the cement-based material layer 21, a non-shrinkable cement-based material capable of reducing drying shrinkage after curing may be used as the cement-based material. The cement-based material layer 21 may contain fibers such as steel fibers, glass fibers, carbon fibers, and organic fibers. The cement-based material layer 21 has a predetermined thickness of, for example, about 3 cm to 20 cm, and a gradient P is formed on the upper surface thereof so as to be inclined toward both ends of the superstructure A in the direction Y perpendicular to the bridge axis. .. The cement-based material layer 21 may have a thickness of 20 cm or more.

The cement-based material layer 21 may be reinforced by either one or both of reinforcing bars and fibers. Further, the cement-based material layer 21 may be a precast version. Further, the cement-based material layer 21 may be reinforced by introducing prestress.

The resin-based material layer 22 is made of, for example, a resin-based material such as asphalt urethane having waterproof performance. As the resin-based material layer 22, for example, a material that satisfies the required performance (grade II) of the structure construction management procedure (July 2015 version) issued by NEXCO Research Institute, Ltd. is used. The resin-based material layer 22 may contain fibers such as steel fibers, glass fibers, carbon fibers, and organic fibers. Further, as the resin-based material layer 22, a sheet-like material may be used, or a liquid-like material that can be applied to the cement-based material layer 21 may be used.

The resin-based material layer 22 may be omitted from the waterproof layer 2, and at this time, the waterproof layer 2 becomes the cement-based material layer 21. In the present invention, the waterproof layer 2 may include at least the cement-based material layer 21. Further, in the waterproof layer 2, an adhesive, crushed stone, or the like may be provided between the cement-based material layer 21 and the resin-based material layer 22, if necessary.

The surface layer 3 is a mixed material composed of an asphalt-based material and containing crushed stone, sand, stone powder, asphalt, etc. in a predetermined ratio. The surface layer 3 is provided on the upper surface of the resin-based material layer 22 with substantially the same thickness in the direction Y perpendicular to the bridge axis. The surface layer 3 has, for example, a thickness of about 3 cm to 15 cm, but is not limited to this, and may be any thickness as long as it has a predetermined thickness. The surface layer 3 has a slope formed on the upper surface thereof so as to be inclined toward both ends of the superstructure A in the direction Y orthogonal to the bridge axis.

An epoxy resin-based adhesive is used as the adhesive 4, but the adhesive is not limited to this, and an adhesive of any material such as an acrylic resin-based adhesive may be used.

In the pavement structure 1, the adhesive 4 may be omitted. At this time, the pavement structure 1 includes a waterproof layer 2 provided on the upper surface of the superstructure A and a surface layer 3 provided on the upper surface of the waterproof layer 2. Will be provided.

Next, a method of constructing a pavement structure to which the present invention is applied will be described. A method of constructing a pavement structure to which the present invention is applied includes a waterproof step of providing a waterproof layer 2 on the upper surface of the superstructure A and a surface layer step of providing a surface layer 3 on the upper surface of the waterproof layer 2 provided in the waterproof step.

FIG. 4 is a diagram for explaining a procedure for applying an adhesive in the waterproofing step of the construction method of the pavement structure to which the present invention is applied, and FIG. 4A is a diagram showing the adhesive 4 on the upper surface of the superstructure A. 4 (b) is a diagram showing a state before the adhesive 4 is applied, and FIG. 4 (b) is a diagram showing a state after the adhesive 4 is applied.

As shown in FIG. 4A, the construction method of the pavement structure to which the present invention is applied starts from a state in which the superstructure A in which the interstitial concrete 8 is placed between the concrete girders 7 is constructed. do. In the waterproofing step, as shown in FIG. 4B, the adhesive 4 is applied to the upper surface of the superstructure A composed of the concrete girder 7 and the padded concrete 8. At this time, the seam J of the superstructure A is covered with the adhesive 4.

FIG. 5 is a diagram for explaining a procedure for providing a waterproof layer in the waterproofing process of a pavement structure construction method to which the present invention is applied, and FIG. 5A is a diagram for providing a cement-based material layer 21. FIG. 5B is a diagram in which the resin-based material layer 22 is provided.

In the waterproofing step, as shown in FIG. 5, the waterproof layer 2 is attached to the upper surface of the superstructure A via the applied adhesive 4. As a result, the waterproof layer 2 is firmly fixed to the superstructure A, and is difficult to peel off from the superstructure A.

Specifically, in the waterproofing step, as shown in FIG. 5A, the cement-based material layer 21 is attached to the upper surface of the superstructure A via the applied adhesive 4. When the cement-based material layer 21 is provided, a cement-based material mixed with water or the like is cast on the upper surface of the superstructure A and cured. Further, a gradient P is formed on the upper surface of the cement-based material layer 21 so as to be inclined toward both ends in the direction Y orthogonal to the bridge axis.

Then, in the waterproofing step, as shown in FIG. 5B, the resin-based material layer 22 is provided on the upper surface of the cement-based material layer 21 with a thickness substantially equal to that in the direction Y perpendicular to the bridge axis. As a result, a gradient is formed on the upper surface of the resin-based material layer 22 so as to be inclined toward both ends of the superstructure A in the direction Y perpendicular to the bridge axis. When the resin-based material layer 22 is formed in a sheet shape, the resin-based material layer 22 can be easily provided by expanding the sheet-shaped resin-based material layer 22 and providing it on the upper surface of the cement-based material layer 21. It will be possible to construct. When a resin-based material layer 22 that can be applied to the cement-based material layer 21 is used, the resin-based material layer 22 is provided by applying the resin-based material layer 22 to the upper surface of the cement-based material layer 21.

In the waterproofing step, the application of the adhesive 4 can be omitted. At this time, in the waterproofing step, the waterproof layer 2 is provided on the upper surface of the superstructure A.

Next, in the surface layer step, as shown in FIG. 2, the surface layer 3 is provided on the upper surface of the resin-based material layer 22 with a thickness substantially equal to that in the direction Y orthogonal to the bridge axis. In the surface layer step, the surface layer 3 has a thickness substantially equal to that in the bridge axis orthogonal direction Y on the upper surface of the waterproof layer 2 including the cement-based material layer 21 on which the gradient P inclined toward both ends in the bridge axis orthogonal direction Y is formed. By providing the above, a gradient inclined toward both ends of the superstructure A in the direction perpendicular to the bridge axis Y is formed on the upper surface of the surface layer 3. In this way, in the pavement structure construction method to which the present invention is applied, the pavement structure 1 is constructed and completed.

In the construction method of the pavement structure to which the present invention is applied, the upper surface of the waterproof layer 2 including the cement-based material layer 21 is not provided under the surface layer as in the conventional case, and the base layer composed of the asphalt-based material is not provided. A surface layer 3 of an asphalt-based material is provided on the surface. Therefore, in the construction method of the pavement structure to which the present invention is applied, the conventional step of providing the base layer can be omitted, and the construction time can be shortened.

In the pavement structure construction method to which the present invention is applied, the surface layer 3 is provided on the upper surface of the waterproof layer 2 including the cement-based material layer 21. Therefore, in the construction method of the pavement structure to which the present invention is applied, although moisture permeates from the surface layer 3 due to snow, rain, etc., the cement-based material layer 21 such as concrete, which is more dense than the surface layer 3, suppresses the permeation of moisture. can do. As a result, it is possible to suppress the permeation of water to the superstructure A, and eventually to prevent water leakage from the seam J of the superstructure A.

Further, in the construction method of the pavement structure to which the present invention is applied, when a large amount of calcium chloride, sodium chloride, magnesium chloride or the like is sprayed on the surface layer 3 as a snow melting agent or an antifreeze agent, these are applied to snow, rain, etc. The chemicals in the above are dissolved, and the water in which chloride ions are eluted permeates the surface layer 3. Even at this time, in the pavement structure construction method to which the present invention is applied, since the surface layer 3 is provided on the upper surface of the waterproof layer 2 including the cement-based material layer 22, the moisture from which chloride ions are eluted is the superstructure. It is possible to suppress the penetration to the seam J of A. As described above, in the pavement structure construction method to which the present invention is applied, since the surface layer 3 is provided on the upper surface of the waterproof layer 2 including the cement-based material layer 22, the reinforcing bars, tension materials, etc. embedded in the concrete girder 7 can be used. It is possible to suppress the permeation of water from which chloride ions have been eluted, which causes the passive film of the steel material 79 to be destroyed. As a result, it is possible to suppress the permeation of the water content in which the chloride ions are eluted to the superstructure A, and to suppress the corrosion of the steel material such as the reinforcing bar embedded in the concrete girder material 7.

Further, in the construction method of the pavement structure to which the present invention is applied, as shown in FIG. 6A, an asphalt-based material is formed on the upper surface of the waterproof layer 2 including the cement-based material layer 21 provided in the waterproofing step. A surface layer process for providing the surface layer 3 is provided. Therefore, in the pavement structure construction method to which the present invention is applied, when the surface layer 3 of the asphalt-based material is replaced, as shown in FIG. 6B, the cement-based material layer 21 is left and the surface layer 3 is replaced. It will be cut with a cutting machine or the like. At this time, in the pavement structure construction method to which the present invention is applied, when the surface layer 3 is cut by a cutting machine or the like, the upper surface of the cement-based material layer 21 may be damaged, but the cement-based material layer 21 remains. Therefore, it is possible to prevent the superstructure A from being damaged.

In the construction method of the pavement structure to which the present invention is applied, a waterproof layer including a cement-based material layer 21 composed of a cement-based material containing _{CaO ・ 2AL 2} O _{3 (CA2), which is a kind of calcium aluminate, in the waterproofing process.} 2 is provided.

Here, the chloride immobilization mechanism, which is the corrosion suppressing effect of CA2, will be described. By mixing a powder containing _{CA2 (CaO · 2Al 2 O 3} ), causing a chemical reaction shown in the following equation, hydrocalumite _{(3CaO · Al 2 O 3 ·} Ca (OH) 2 · 12H 2 O) is It is produced in large quantities.

_{7Ca (OH) 2 + CaO ·} 2Al 2 O 3 + 19H 2 O → 2 (3CaO · Al 2 O 3 · Ca (OH) 2 · 12H 2 O)

In this hydrocarbimite, in a state where chloride ions are liberated in water, chloride ions are converted into Friedel's salt (3CaO, Al ₂ O ₃ , CaCl ₂・ 11H ₂ O) as shown in the following formula. Immobilize.

_{3CaO · Al 2 O 3 · Ca} (OH) 2 · 12H 2 O + 2Cl - → 3CaO · Al 2 O 3 · CaCl 2 · 11H 2 O + 2OH -

As described above, when CA2 is contained in the cement-based material layer 21, soluble chloride ions are immobilized as Friedel's salt, soluble chloride ions that are easily released into water are reduced, and chloride ions are reduced. It exerts the effect of suppressing damage to the passivation film due to. Therefore, the corrosion suppressing effect can be continuously exerted for a long period of time.

In the construction method of the pavement structure to which the present invention is applied, the waterproof layer 2 including the cement-based material layer 21 composed of the non-shrinkable cement-based material is provided in the waterproofing step. As a result, in the pavement structure construction method to which the present invention is applied, the drying shrinkage of the cement-based material layer 21 after curing is suppressed, and the adhesion of the superstructure A to the upper surface can be kept stronger. Further, in the construction method of the pavement structure to which the present invention is applied, the resin-based material layer 22 or the surface layer 3 provided on the upper surface of the cement-based material layer 21 is provided by suppressing the drying shrinkage of the cement-based material layer 21 after curing. It is possible to keep the adhesion with and more firmly.

In the construction method of the pavement structure to which the present invention is applied, the cement-based material layer 21 is provided on the upper surface of the superstructure A and the resin-based material layer 22 is provided on the upper surface of the cement-based material layer 21 in the waterproofing step. Thereby, the pavement structure construction method to which the present invention is applied can further improve the effect of suppressing the permeation of water into the superstructure A by the cement-based material layer 21 and the resin-based material layer 22. It becomes.

In the construction method of the pavement structure to which the present invention is applied, a gradient P is formed on the upper surface of the cement-based material layer 21 in the waterproofing step, and the surface layer 3 is provided on the upper surface of the waterproof layer 2 including the cement-based material layer 21. Therefore, in the construction method of the pavement structure to which the present invention is applied, when the surface layer 3 is provided, the slope is formed on the upper surface of the surface layer 3 by providing the surface layer 3 so as to have substantially the same thickness in the direction Y perpendicular to the bridge axis. It will be possible. That is, the construction method of the pavement structure to which the present invention is applied is to provide the surface layer 3 having substantially the same thickness in the bridge axis orthogonal direction Y without making the thickness of the surface layer 3 different in the bridge axis orthogonal direction Y in the surface layer process. It is possible to form a gradient on the upper surface of the surface layer 3. Therefore, in the construction method of the pavement structure to which the present invention is applied, it is not necessary to adjust the thickness of the surface layer 3 in the direction Y orthogonal to the bridge axis, and the workability of the surface layer 3 can be improved, and as a result, the construction time can be reduced. It can be shortened.

In the method of constructing a pavement structure to which the present invention is applied, in the waterproofing step, a waterproof layer 2 including a cement-based material layer 21 reinforced by either one or both of reinforcing bars and fibers is provided. As a result, cracks in the cement-based material layer 21 can be suppressed. Therefore, the permeation of water from the cement-based material layer 21 can be suppressed.

In the method of constructing a pavement structure to which the present invention is applied, in the waterproofing step, a waterproof layer 2 including a cement-based material layer 21 which is a precast plate is provided. As a result, the cement-based material layer 21 can be easily formed on site. Therefore, the construction time can be shortened.

In the method of constructing a pavement structure to which the present invention is applied, in the waterproofing step, a waterproofing layer 2 including a cement-based material layer 21 reinforced by prestress is provided. As a result, cracks in the cement-based material layer 21 can be suppressed. Therefore, the permeation of water from the cement-based material layer 21 can be suppressed.

FIG. 7 is a perspective view showing another form of the superstructure in which the construction method of the pavement structure to which the present invention is applied is carried out. FIG. 8 is an enlarged front view of FIG. 7.

As shown in FIG. 7, the pavement structure construction method to which the present invention is applied may be applied to the superstructure A in which the concrete box girder is used as the concrete girder 7. The superstructure A is provided, for example, by so-called overhanging work, which is provided by sequentially arranging concrete girders 7 as concrete box girders in the bridge axis direction X. The superstructure A has a joint J formed between adjacent concrete girders 7 in the bridge axis direction X so as to extend in the bridge axis orthogonal direction Y. Then, the seam J of the superstructure A is covered with the waterproof layer 2.

As shown in FIG. 8, a steel material 79 such as a steel rod may be embedded in the side wall 71 of the concrete girder material 7 which is a concrete box girder material to resist shear deformation of the concrete girder material 7. The steel material 79 is formed so as to extend in the height direction Z.

At this time, the steel material 79 embedded in the side wall 71 is provided with a waterproof layer 2 on the upper surface of the superstructure A. The waterproof layer 2 preferably includes a cement-based material layer 21 and a sheet-shaped resin-based material layer 22 composed of a resin-based material containing fibers on the upper surface of the cement-based material layer 21. As a result, the cement-based material layer 21 and the resin-based material layer 22 can firmly prevent the steel material 79 from protruding from the upper surface of the superstructure A.

Next, a pavement replacement method to which the present invention is applied will be described.

As shown in FIG. 6, the pavement replacement method to which the present invention is applied is applied to the pavement structure 1 constructed by the pavement structure construction method to which the present invention is applied. In the pavement replacement method to which the present invention is applied, the surface layer 3 is cut by a cutting machine or the like while leaving the waterproof layer 2 including the cement-based material layer 21 of the pavement structure 1 constructed by the pavement structure construction method to which the present invention is applied. It includes a cutting step of cutting and an installation step of providing a new surface layer 3 made of an asphalt-based material on the upper surface of the waterproof layer 2 including the cement-based material layer 21 left in the cutting step.

That is, in the pavement replacement method to which the present invention is applied, a waterproof layer 2 including a cement-based material layer 21 provided on the upper surface of the superstructure A having a seam J and composed of at least a cement-based material, and a waterproof layer In the cutting step of cutting the surface layer 3 with a cutting machine or the like while leaving the waterproof layer 2 including the cement-based material layer 21 of the pavement structure 1 having the surface layer 3 made of asphalt-based material on the upper surface of the 2 and the cutting step. An installation step of providing a new surface layer 3 made of an asphalt-based material is provided on the upper surface of the waterproof layer 2 including the remaining cement-based material layer 21.

In the pavement replacement method to which the present invention is applied, as shown in FIG. 6B, when the resin-based material layer 22 is provided on the upper surface of the cement-based material layer 21, at least the cement-based material layer is used in the cutting step. If the material layer 21 is left behind, the resin-based material layer 22 of the waterproof layer 2 may be left behind when cutting the surface layer 3.

In the pavement replacement method to which the present invention is applied, when the resin-based material layer 22 of the waterproof layer 2 is left when cutting the surface layer 3, a new surface layer 3 is formed on the upper surface of the resin-based material layer 22 in the installation process. It will be provided.

In the pavement replacement method to which the present invention is applied, the surface layer 3 is cut by a cutting machine or the like, leaving the waterproof layer 2 including the cement-based material layer 21 in the cutting process. At this time, in the pavement replacement method to which the present invention is applied, when the surface layer 3 is cut by a cutting machine or the like, the upper surface of the cement-based material layer 21 may be damaged, but the cement-based material is below the surface layer 3. Since the layer 21 is provided, it is possible to prevent the superstructure A from being damaged.

Further, in the pavement replacement method to which the present invention is applied, the surface layer 3 only needs to be cut in the cutting process without providing a base layer made of an asphalt-based material under the surface layer as in the conventional case. Since the amount of asphalt-based material to be used is reduced, it is possible to shorten the construction time required for cutting.

Further, in the pavement replacement method to which the present invention is applied, the cement-based material layer 21 left in the cutting step in the installation step is provided without providing the base layer composed of the asphalt-based material under the surface layer as in the conventional case. A new surface layer 3 of asphalt-based material is provided on the upper surface of the waterproof layer 2 including the waterproof layer 2. Therefore, in the construction method of the pavement structure to which the present invention is applied, the conventional step of providing the base layer can be omitted, and the construction time can be shortened.

In the pavement replacement method to which the present invention is applied, a new surface layer 3 is provided on the upper surface of the waterproof layer 2 including the cement-based material layer 22. Therefore, in the construction method of the pavement structure to which the present invention is applied, although moisture permeates from the surface layer 3 due to snow, rain, etc., the cement-based material layer 22 such as concrete, which is more dense than the surface layer 3, suppresses the permeation of moisture. can do. As a result, it is possible to suppress the permeation of water to the superstructure A, and eventually to prevent water leakage from the seam J of the superstructure A.

In the pavement replacement method to which the present invention is applied, as shown in FIG. 9A, the resin material layer 22 may be cut together with the surface layer 3 in the cutting step. When the resin-based material layer 22 is cut together with the surface layer 3, a new surface layer 3 may be provided on the upper surface of the remaining cement-based material layer 21 as shown in FIG. 9B in the installation step.

Further, although not shown, in the pavement replacement method to which the present invention is applied, when the resin-based material layer 22 is cut together with the surface layer 3 in the cutting step, it is placed on the upper surface of the cement-based material layer 21 left in the installation step. After providing the new resin-based material layer 22, a new surface layer 3 may be provided on the upper surface of the new resin-based material layer 22. Even at this time, a new surface layer 3 is provided on the upper surface of the waterproof layer 2.

In the pavement replacement method to which the present invention is applied, the superstructure A in which the concrete girder 7 having a substantially T-shaped cross section and the padded concrete 8 are used has been described as an example. It may be applied to the superstructure A in which the box girder is used.

Although the examples of the embodiments of the present invention have been described in detail above, all of the above-described embodiments are merely examples of the embodiment of the present invention, and the technical aspects of the present invention are based on these. The scope should not be construed in a limited way.

1: Pavement structure 2: Waterproof layer 3: Surface layer 4: Adhesive 7: Concrete girder 8: Filled concrete 9: Wall railing 21: Resin-based material layer 22: Cement-based material layer A: Superstructure P: Gradient X : Bridge axis direction Y: Bridge axis orthogonal direction

Claims (11)

A waterproofing process in which a waterproof layer including at least a cement-based material layer composed of a cement-based material is provided on the upper surface of a concrete superstructure having a seam.
A method for constructing a pavement structure, which comprises a surface layer step of providing a surface layer made of an asphalt-based material on the upper surface of the waterproof layer provided in the waterproof step. The waterproofing step according to claim 1, wherein the waterproofing step includes the cement-based material layer and a resin-based material layer composed of a resin-based material on the upper surface of the cement-based material layer. Construction method of pavement structure. In the waterproofing step, a cement-based material layer and fibers are placed on the upper surface of the cement-based material layer on the upper surface of the superstructure in which a concrete box girder material in which a steel material extending in the vertical direction is embedded in a side wall is used. The method for constructing a pavement structure according to claim 2, further comprising providing the sheet-shaped resin-based material layer composed of the contained resin-based material and the waterproof layer containing the resin-based material. The method for constructing a pavement structure according to claim 1 or 2, wherein in the waterproofing step, the waterproof layer is provided on the upper surface of the superstructure having a seam between the concrete girder and the padded concrete. .. The waterproofing step according to claim 1 to 4, wherein an adhesive is applied to the upper surface of the superstructure, and the waterproof layer is adhered to the upper surface of the superstructure via the applied adhesive. The construction method of the pavement structure according to any one of the items. The method for constructing a pavement structure according to any one of claims 1 to 5, wherein in the waterproofing step, the waterproof layer including the cement-based material layer composed of a non-shrinkable cement-based material is provided. .. Wherein the waterproof process, the upper surface of the upper structure steel is embedded, the waterproof containing the cementitious material layer composed of cementitious material containing CaO · 2AL ₂ O ₃ which is a type of calcium aluminate The method for constructing a pavement structure according to any one of claims 1 to 6, wherein a layer is provided. The pavement structure according to any one of claims 1 to 7, wherein in the waterproofing step, the waterproof layer including the cement-based material layer reinforced by either one or both of reinforcing bars and fibers is provided. Construction method. The method for constructing a pavement structure according to any one of claims 1 to 8, wherein in the waterproofing step, the waterproofing layer including the cement-based material layer which is a precast version is provided. The method for constructing a pavement structure according to any one of claims 1 to 9, wherein in the waterproofing step, the waterproofing layer including the cement-based material layer reinforced by prestress is provided. A cutting step of cutting the surface layer while leaving the cement-based material layer of the waterproof layer of the pavement structure constructed by the construction method of the pavement structure according to any one of claims 1 to 10.
A pavement replacement method comprising an installation step of providing a new surface layer made of an asphalt-based material on the upper surface of the waterproof layer including the cement-based material layer left in the cutting step.

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