JP5127668B2 - Steel slab structure and steel slab reinforcement method - Google Patents

Description

  The present invention relates to a steel deck structure of a bridge and a steel deck reinforcement method.

Steel floor slab structures are used for bridges such as long-span bridges because they are lightweight.
Here, an example of a general steel deck structure is shown in FIG. In FIG. 5, the steel deck 100 includes a deck plate 102, a plurality of vertical ribs 104 extending in parallel to the longitudinal direction of the steel deck 100 (the longitudinal direction of the bridge) on the lower surface of the deck plate 102, and the longitudinal plate 104. A horizontal rib 106 extending across the rib 104, a main rib 110 supporting the vertical rib 104 and the horizontal rib 106, and a pavement 108 provided on the upper surface of the deck plate 102 are included.
However, in recent years, there have been many reports of fatigue damage, particularly damage that breaks the weld between the bottom surface of the deck plate and the vertical ribs, mainly in bridges with heavy traffic, and when repairing damaged parts, It is required to construct a high-strength steel slab structure that can suppress the occurrence of such damage.
As such a high-strength steel deck structure, for example, a deck plate, a plurality of vertical ribs extending in parallel to the longitudinal direction of the bridge on the lower surface of the deck plate, and perpendicular to the longitudinal direction of the bridge In the steel floor slab structure of the bridge having a horizontal rib extending across the vertical rib and a pavement provided on the upper surface of the deck plate, a concrete precast panel laid on the upper surface of the deck plate And a steel floor slab structure of a bridge comprising a joining means (for example, one containing an adhesive) for joining the concrete precast panel to the upper surface of the deck plate has been proposed (Patent Document 1).
JP 2006-348487 A

According to the technique described in Patent Document 1, since the concrete precast panel is used, the bridge is reinforced in a short time without requiring long-time traffic interruption as in the case of construction using cast-in-place concrete. It can be performed. Moreover, since the said concrete precast panel can be conveyed manually, it can reinforce a bridge without using a large sized machine.
However, in the technique described in Patent Document 1, it has been found that there is a case where a large air pocket is generated between the deck plate and the concrete precast panel, and a poorly bonded portion may be generated between the deck plate and the concrete precast panel. did. When such a poorly bonded portion exists, there is a problem that the concrete precast panel is easily damaged, and the fatigue durability of the steel slab after reinforcement is lowered.
In addition, according to the technique described in Patent Document 1, when placing a concrete precast panel on a deck plate coated with an adhesive, the concrete precast panel is easily slipped, and the position of the concrete precast panel is likely to be displaced. Also turned out. In this case, if a displacement occurs in one of the placed precast panels, all subsequent precast panels are also displaced, so that the positions of the plurality of precast panels as a whole are inaccurate. There's a problem.
Therefore, the present invention suppresses the occurrence of air accumulation between the deck plate and the concrete precast panel, and causes fatigue damage caused by the air accumulation (mainly the joint between the bottom surface of the deck plate and the vertical ribs). Steel floor slab structure reinforcement method that can prevent the occurrence of damage (breakage of welded parts) and can place the concrete precast panel at a predetermined position with high accuracy without sliding. The purpose is to provide a floor slab structure.

  As a result of intensive studies to solve the above problems, the present inventor is made of a cementitious hardened body having a specific mechanical strength, and has a convex portion having a specific height and / or an adhesive surface with the deck plate. Or it discovered that the said objective of this invention could be achieved by using the panel which has a recessed part, and completed this invention.

That is, the present invention provides the following [1] to [4].
[1] A deck plate, a plurality of vertical ribs extending parallel to the longitudinal direction of the bridge on the lower surface of the deck plate, and extending across the vertical ribs perpendicular to the longitudinal direction of the bridge A steel floor slab structure of a bridge including a lateral rib and a pavement provided above the deck plate, and a compressive strength between the deck plate and the pavement of 120 N / mm ² or more and a bending strength Is made of a cementitious hardened body of 30 N / mm ² or more, and a panel having at least one convex portion and / or concave portion with a height of 2 mm or less on at least one surface thereof, the deck plate and the convex portion of the panel on the top surface of the deck plate And / or a steel floor slab structure comprising a reinforcing structure portion laid down through an adhesive layer so as to face a surface having a recess.
[2], wherein the panels, cement, fine powder, inorganic powder of Blaine specific surface area of 3,500~10,000cm ² / g, a maximum particle size of less 2mm fine bone BET specific surface area of 5~25m ² / g The steel slab structure according to the above [1], comprising a cured product of a blend containing a material, a water reducing agent, fibers, and water.
[3] The steel deck structure according to [1] or [2], wherein the adhesive layer is a layer made of a cured product of an acrylic resin adhesive.
[4] A deck plate, a plurality of vertical ribs extending in parallel to the longitudinal direction of the bridge on the lower surface of the deck plate, and extending across the vertical rib perpendicular to the longitudinal direction of the bridge In the steel floor slab reinforcement method of the bridge including the horizontal rib and the pavement provided above the deck plate, after removing at least a part of the pavement and exposing the upper surface of the deck plate, An adhesive is applied to the upper surface of the deck plate, and the upper surface of the deck plate to which the adhesive has been applied is made of a cementitious hardened body having a compressive strength of 120 N / mm ² or more and a bending strength of 30 N / mm ² or more. Placing a panel having a convex part and / or a concave part with a height of 2 mm or less on one side so that the surface having the convex part and / or the concave part of the panel faces the deck plate, Was to form a thin layer paving on the upper surface of the panel, the steel deck reinforcing construction method characterized by embedding the panel.

According to the steel slab structure of the present invention, the deck plate and the panel are formed by laying a panel having a convex portion and / or a concave portion having a specific height on the upper surface of the deck plate via an adhesive layer. In addition, it is possible to bond uniformly while suppressing the formation of air pockets (adhesion failure locations) between them. As a result, the panel is uniformly loaded. And it becomes difficult to produce the damage resulting from the uneven load through an air pocket (adhesion defective part) seen when using the panel which has the conventional flat surface, and it is high with respect to a steel slab structure. Fatigue durability (especially, suppressing damage such as cracking of the weld between the lower surface of the deck plate and the vertical rib) can be imparted.
Further, according to the steel slab structure of the present invention, since a panel having a convex portion and / or a concave portion having a specific height is used, misalignment hardly occurs when the panel is laid on the deck plate, and a predetermined position is obtained. Can be arranged with high accuracy.
Furthermore, the bridge can be reinforced in a short time without requiring long-time traffic interruption for curing, as in the case of construction using cast-in-place concrete. Moreover, since the said panel can be conveyed manually, a bridge can be reinforced without using a large sized machine.
The steel slab structure of the present invention can be employed both when a bridge is newly formed and when an existing bridge is reinforced.

First, with reference to FIGS. 1-4, the steel deck structure of this invention is demonstrated. In FIG. 1 to FIG. 4, components common to the steel plate 100 of the bridge shown in FIG.
In FIG. 1, a steel floor slab structure 1 of the present invention includes a deck plate 102, vertical ribs 104, horizontal ribs 106 (not shown, refer to FIG. 5), pavement 108, adhesive layer 2, and panel 3. And the thin pavement 4.
The vertical ribs 104 are plate-like members having a substantially trapezoidal or U-shaped cross section, and a plurality of vertical ribs 104 are extended in parallel to the longitudinal direction of the steel deck structure 1. The plurality of vertical ribs 104 are all fixed to the bottom surface of the deck plate 102 by welding.
The transverse rib 106 (see FIG. 5) is a plate-like member having a substantially T-shaped longitudinal section, and extends across the longitudinal rib 104 perpendicular to the longitudinal direction of the steel deck structure 1. It is installed. A plurality of the lateral ribs 106 are provided at predetermined intervals in the longitudinal direction of the steel deck structure 1. All the lateral ribs 106 are fixed to the lower surface of the deck plate 102.
The pavement 108 is a portion constituting the uppermost surface of the steel deck structure 1 made of, for example, asphalt pavement.

  The adhesive layer 2 is interposed between the deck plate 2 and the panel 3 to bond the deck plate 2 and the panel 3 together. The adhesive layer 2 is usually made of a cured product of a synthetic resin adhesive, and is preferably made of a cured product of an acrylic resin-based adhesive because high adhesive strength can be obtained and the curing rate is high even at low temperatures. .

The panel 3 is made of a cementitious hardened body having specific mechanical strength (compressive strength, bending strength), and at least one side thereof has a convex portion and / or a concave portion (in FIG. 1, a convex portion 6 is formed on one side 5). This is a plate-like member.
Compressive strength of cementitious hardened material constituting the panel 3, 120 N / mm ² or more, preferably 140 N / mm ² or more, more preferably 160 N / mm ² or more. The upper limit of the compressive strength is not particularly limited, but is usually 300 N / mm ² .
Further, the bending strength of the cementitious cured body constituting the panel 3 is 30 N / mm ² or more, preferably 33 N / mm ² , more preferably 36 N / mm ² . The upper limit of the bending strength is not particularly limited, but is usually 50 N / mm ² .
By using a panel made of a cementitious hardened body having such compressive strength and bending strength, a steel deck structure with excellent fatigue durability can be obtained. When the compressive strength of the hardened cementitious body is less than 120 N / mm ² or the bending strength is less than 30 N / mm ² , the fatigue durability of the panel is lowered and partial breakage of the steel deck structure is likely to occur. .

The panel 3 has a convex portion and / or a concave portion (in FIG. 1) having a height of 2 mm or less, preferably a height of 0.3 to 1.5 mm, more preferably a height of 0.5 to 1.0 mm. It is shown as a convex part 6). By laying such a panel 3 such that the surface 5 having convex portions and / or concave portions faces the deck plate 102 with the adhesive layer 2 interposed therebetween, the deck plate and the panel are placed with a large air space therebetween. Bonding can be performed without causing accumulation (adhesion failure location), and a steel slab structure excellent in fatigue durability can be obtained. When the height of the convex part and / or concave part exceeds 2 mm, or when there is no convex part and / or concave part, a large air pool tends to occur between the deck plate and the panel. The fatigue durability of the plate structure is lowered and a sufficient reinforcing effect cannot be obtained.
As a method of providing the convex part and / or the concave part, a plurality of convex parts and / or concave parts may be provided on one side of the panel, or one convex part and / or concave part may be provided. However, the former is preferable (providing a plurality of convex portions and / or concave portions).
By providing a plurality of convex portions and / or concave portions, the occurrence of air pockets can be reduced. In this case, the area of one convex part and / or a concave part is preferably 0.03 to 2.0%, more preferably 0.05 to 1.0%, where the area of one side of the panel is 100%. Moreover, the ratio of the total area of the plurality of convex portions and / or concave portions in the entire area of one side of the panel is preferably 5 to 50%, more preferably 10 to 40%.

When providing one convex part and / or a recessed part with respect to the single side | surface of a panel, as a shape of this convex part and / or a recessed part, the shape of the shape of the cross of a cross which passes along the approximate center point of the single side | surface of a panel, etc. are mentioned, for example. (See FIG. 2). When a plurality of convex portions and / or concave portions are provided on one side of the panel, the shape of the convex portions and / or concave portions is, for example, circular (see (a) in FIG. 3), rhombus (in FIG. 3) (B)), a square (see (c) in FIG. 3), a rectangle (see (d) in FIG. 3), and the like. In this case, it is preferable that the plurality of convex portions and / or concave portions are provided substantially evenly on one side of the panel.
The heights of the convex portions and the concave portions are, as indicated by the symbol h in FIGS. 2 and 3, assuming that one side of the panel is a reference surface (reference A in FIGS. 2 and 3) and the reference surface A and the concave portions. Or the distance between the reference surface A and the top surface of the convex portion (reference symbol B in FIG. 3).

The thickness of the panel 3 is preferably 30 to 60 mm, more preferably 35 to 50 mm, and particularly preferably 35 to 45 mm. When the thickness of the panel is less than 30 mm, the reinforcing effect of the steel slab is insufficient, and the fatigue durability is lowered, which is not preferable. In addition, if the thickness of the panel exceeds 60 mm, it is not preferable because it is difficult to attach the panel to the deck plate and the cost for manufacturing the panel increases.
In addition, the thickness of a panel means the distance of the reference surface (code | symbol A in FIG.2 and FIG.3) of the single side | surface of a panel, and the other surface of the other side.
The length and width of the panel 3 are, for example, 100 to 200 cm (length) × 30 to 80 cm. The mass of the panel 3 is 40 to 80 kg, for example.

Panel 3 includes (A) cement, (B) fine powder having a BET specific surface area of 5 to 25 m ² / g, (C) an inorganic powder having a brane specific surface area of 3,500 to 10,000 cm ² / g, ( It is preferable that it consists of the hardened | cured material (cemented hardened | cured body) of the compound containing the fine aggregate whose maximum particle diameter is 2 mm or less, (E) water reducing agent, (F) water, and (G) fiber.
(A) Although it does not specifically limit as a kind of cement, For example, various Portland cements, such as normal Portland cement, early strong Portland cement, moderately-heated Portland cement, low heat Portland cement, can be used.
When trying to improve the early strength of the panel, it is preferable to use early-strength Portland cement, and when trying to improve the fluidity of the blend, use moderately hot Portland cement or low heat Portland cement. It is preferable to do.

(B) Examples of the fine powder having a BET specific surface area of 5 to 25 m ² / g include silica fume, silica dust, fly ash, slag, volcanic ash, silica sol, precipitated silica, and limestone powder. In general, silica fume and silica dust have a BET specific surface area of 5 to 25 m ² / g and do not need to be pulverized, and thus are suitable as the fine powder of the present invention. Moreover, limestone powder is also suitable as the fine powder of the present invention from the viewpoints of pulverizability and fluidity.
The fine powder should have a BET specific surface area of 5 to 25 m ² / g, preferably 7 to 15 m ² / g. When the value is less than 5 m ² / g, the effect of improving the strength, denseness and impact resistance of the panel is lowered. On the other hand, when the value exceeds 25 m ² / g, the unit water amount increases, and the strength, denseness, impact resistance, and the like of the panel decrease.
(B) The compounding quantity of fine powder becomes like this. Preferably it is 5-50 mass parts with respect to 100 mass parts of (A) cement, More preferably, it is 10-40 mass parts. When the blending amount is out of the above range, the effect of improving the strength, denseness, impact resistance and the like of the panel is lowered.

(C) The inorganic powder having a Blaine specific surface area of 3,500 to 10,000 cm ² / g is an inorganic powder other than cement, such as slag, limestone powder, feldspar, mullite, alumina powder, quartz powder, fly ash , Volcanic ash, silica sol, carbide powder, nitride powder and the like. Among these, slag, fly ash, limestone powder, and quartz powder are preferably used in terms of cost and quality stability after curing.
(C) Blaine specific surface area of the inorganic powder is required to be 3,500~10,000cm ² / g, preferably 4,000~9,000cm ² / g, particularly preferably 5,000～9 1,000 cm ² / g. When the value is less than 3,500 cm ² / g, the effect of improving the strength, denseness, impact resistance and the like of the panel is lowered. On the other hand, when the value exceeds 10,000, the effect of improving the fluidity of the blend and the effect of improving the strength, denseness, impact resistance and the like of the panel are lowered, and the cost is further increased.
(C) The compounding quantity of inorganic powder becomes like this. Preferably it is 5-55 mass parts with respect to 100 mass parts of (A) cement, More preferably, it is 10-50 mass parts. When the blending amount is out of the above range, the effect of improving the fluidity and workability of the blend and the effect of improving the strength, denseness, impact resistance and the like of the panel are lowered.

(D) Examples of fine aggregates having a maximum particle size of 2 mm or less include river sand, land sand, sea sand, crushed sand, silica sand, and mixtures thereof.
(D) The fine aggregate is required to have a maximum particle size of 2 mm or less, preferably 1.5 mm or less, more preferably 1 mm or less. When the maximum particle size of the fine aggregate exceeds 2 mm, the strength of the panel may be lowered, and it may be difficult to produce a thin panel.
The blending amount of (D) fine aggregate is preferably 50 to 250 parts by mass, more preferably 80 to 180 parts by mass with respect to 100 parts by mass of (A) cement. When the blending amount is out of the above range, the strength of the panel may be lowered and the shrinkage may be increased.

(E) As a water reducing agent, a lignin type, naphthalenesulfonic acid type, melamine type, polycarboxylic acid type water reducing agent, AE water reducing agent, high performance water reducing agent, or high performance AE water reducing agent can be used. Among these, it is preferable to use a polycarboxylic acid-based high-performance water reducing agent or a high-performance AE water reducing agent. By blending a water reducing agent, the fluidity and workability of the blend, the denseness and strength of the panel, and the like can be improved.
(E) The blending amount of the water reducing agent is preferably 0.1 to 4.0 parts by mass, more preferably 0.1 to 1.0 parts by mass in terms of solid content with respect to 100 parts by mass of (A) cement. is there. If the blending amount is less than 0.1 parts by mass, it becomes difficult to knead the blend, and the fluidity becomes extremely low, so that molding becomes difficult. On the other hand, if the blending amount exceeds 4.0 parts by mass, material separation may occur, and the denseness and strength after curing may decrease.

(F) As water, tap water etc. can be used.
The water / cement ratio in the formulation constituting the panel is preferably 10-30% by weight, more preferably 15-25% by weight. When the water / cement ratio is less than 10% by mass, it is difficult to knead the blend, and the fluidity is extremely low, which makes molding difficult. On the other hand, if the water / cement ratio exceeds 30% by mass, the denseness and strength after curing may decrease.

(G) Examples of the fibers include metal fibers, organic fibers, and carbon fibers.
Examples of the metal fibers include steel fibers and amorphous fibers, among which steel fibers have high strength and are preferably used from the viewpoint of cost and availability.
The metal fibers preferably have a diameter of 0.01 to 1.0 mm and a length of 2 to 30 mm. When the diameter is less than 0.01 mm, the proof stress of the fiber itself is insufficient, and it is easy to break when subjected to tension. On the other hand, when the diameter exceeds 1.0 mm, the number of the same compounding amount decreases and the bending strength is improved. This reduces the effect of On the other hand, if the length is less than 2 mm, the effect of improving the bending strength is lowered. On the other hand, if the length exceeds 30 mm, fiber balls are likely to be produced during kneading.
The blending amount of the metal fiber is preferably 0.1 to 4.0%, more preferably 0.5 to 3.5%, and still more preferably 0.7 to 3.0% in a volume of the blend of 100%. is there. When the blending amount is less than 0.1%, the bending strength and fracture energy of the panel are reduced. On the other hand, when the blending amount exceeds 4.0%, the unit water amount increases, and the strength and breaking energy of the panel are decreased.

As the organic fiber, vinylon fiber, polypropylene fiber, polyethylene fiber, aramid fiber, or the like can be used. Among these, vinylon fibers are preferable from the viewpoints of strength, cost, availability, and the like.
As the carbon fiber, a PAN-based carbon fiber or a pitch-based carbon fiber can be used.
The organic fiber or carbon fiber preferably has a diameter of 0.005 to 1.0 mm and a length of 2 to 30 mm. When the diameter is less than 0.005 mm, the proof stress of the fiber itself is insufficient, and it is easy to break when subjected to tension. On the other hand, when the diameter exceeds 1.0 mm, the number at the same blending amount is reduced and curing is performed. The effect of improving body destruction energy is reduced. Further, if the length is less than 2 mm, the adhesion to the matrix is reduced, and the effect of improving the fracture energy and the like is reduced. On the other hand, if the length is more than 30 mm, fiber balls are likely to be produced during kneading. Become.
The compounding amount of the organic fiber or carbon fiber is preferably 0.5 to 10%, more preferably 1.0 to 7.0%, still more preferably 1.5 to 5.0, with the volume of the compound being 100%. %. If the blending amount is less than 0.5%, the destruction energy of the panel is reduced, which is not preferable. On the other hand, if the blending amount exceeds 10%, the unit water amount increases, and the strength and breaking energy of the panel become small, which is not preferable.

Furthermore, in this invention, in order to improve the toughness of a panel, (H) fibrous particle or flaky particle | grains can be mix | blended with a compound.
Examples of the fibrous particles include wollastonite, bauxite, mullite, and the like. Examples of the flaky particles include mica flakes, talc flakes, vermulite flakes, and alumina flakes.
The average particle size of the fibrous particles or flaky particles is preferably 1 mm or less. By blending fibrous particles or flaky particles having such an average particle size, the toughness of the panel can be improved. When the average particle size exceeds 1 mm, the fluidity of the blend, the strength after curing, and the like are not preferable.
In addition, the particle size of the particle | grains in this invention is the largest dimension (especially the length in fibrous particle | grains).
(H) The blending amount of the fibrous particles or flaky particles is 35 parts by mass or less with respect to 100 parts by mass of (A) cement from the viewpoint of fluidity of the blend, strength after curing, toughness and the like. Preferably, it is 0.1-20 mass parts.
In addition, in the fibrous particle, it is preferable that the acicular degree represented by the ratio of length / diameter is 3 or more from the viewpoint of increasing the toughness after curing.

The panel of the present invention can be obtained by kneading, molding, curing and the like of the compound containing the above components.
The method for kneading the blend is not particularly limited, and the blend can be kneaded using a conventional mixer such as an omni mixer, a pan-type mixer, a biaxial kneader mixer, a tilt cylinder mixer, and the like.
The forming / curing method is not particularly limited, but it is preferable to perform the following primary curing / secondary curing from the viewpoints of panel productivity and strength development.
(1) The kneaded cement composition is molded using a predetermined mold and subjected to primary curing. The molding method at this time is not particularly limited, but a conventional molding method such as casting can be employed. Examples of the primary curing method include a method in which the cement composition kneaded in a mold is accommodated and left at 5 to 40 ° C. for a predetermined time (about 3 to 48 hours).
(2) After completion of primary curing, the mold is removed, and then secondary curing is performed to produce a cementitious cured body. Examples of the secondary curing method include a steam curing method at 75 to 95 ° C. for 10 to 48 hours. The hardened cementitious body at the time of demolding preferably has a compressive strength of 10 N / mm ² or more. If the compressive strength is less than 10 N / mm ^2, demolding becomes difficult.

Next, with reference to FIG. 4, the reinforcement construction method of the steel deck structure of this invention is demonstrated. FIG. 4 is a diagram showing the procedure of the steel floor slab structure reinforcement method of the present invention, and shows an example in which the existing steel floor slab structure is reinforced using the panel 3.
First, as shown to (a) in FIG. 4, at least one part of the asphalt pavement of the existing bridge is removed, and the upper surface of the deck plate 102 is exposed. Next, an adhesive is applied to the exposed upper surface of the deck plate 102 to form a coating film 7 made of the adhesive (see (b) in FIG. 4).
Next, the panel 3 is laid down so that the surface 5 having the convex portion and / or the concave portion (the convex portion 6 in FIG. 4) faces the deck plate 102 with the coating film 7 interposed therebetween (in FIG. 4). (C)). When the coating film 7 made of an adhesive is cured to form the adhesive layer 2, the deck plate 2 and the panel 3 can be fixed. By configuring in this way, it is possible to fix these while suppressing the occurrence of air pockets (adhesion failure locations) between the deck plate and the panel. The steel slab structure can be sufficiently reinforced without lowering. Moreover, when the panel of this invention is used, when laying down a panel, a position does not shift easily and it can construct with high precision.
Thereafter, a thin pavement 4 is laid on the upper surface of the panel 3 ((d) in FIG. 4). The thin pavement 4 is laid so as to be flush with the other pavement portions 108 to form the uppermost pavement of the steel deck structure. The panel 3 is embedded in a pavement composed of the thin pavement 4 and another pavement portion 108.

The panel laying pattern includes, for example, a method of arranging them on the deck plate in a staggered pattern or in a matrix form vertically and horizontally.
In addition to the adhesive, the panel can be fixed to the deck plate using a shear connector or the like.

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
1. Materials used The following materials were used.
(A) Cement: Low heat Portland cement (manufactured by Taiheiyo Cement)
(B) Fine powder; silica fume (BET specific surface area 10 m ² / g)
(C) Inorganic powder; quartz powder (Blaine specific surface area 7,000 cm ² / g)
(D) Fine aggregate; quartz sand No. 5 (E) water reducing agent; polycarboxylic acid-based high-performance water reducing agent (F) water; tap water (G) metal fiber; steel fiber (diameter: 0.2 mm, length: 15 mm )

2. Performance of Compound and Hardened Body (A) 100 parts by mass of low heat Portland cement, (B) 32 parts by mass of silica fume, (C) 35 parts by mass of quartz powder, (D) 105 parts by mass of fine aggregate, (E) 0 water reducing agent .8 parts by mass (converted to solid content), (F) 22 parts by mass of water, and (G) steel fiber (amount that is 2% of the total volume of the compound) are put into a biaxial kneader, kneaded and compounded I got a thing.
The flow value of the obtained blend, and the compression strength and bending strength of the cured product of the blend were measured by the following methods.
(Flow value)
The flow value of the blend was measured in the method described in “JIS R 5201 (Cement physical test method) 11. Flow test” without performing 15 drop motions. As a result, the flow value was 270 mm.
(Compressive strength)
The blend was poured into a φ50 × 100 mm formwork, placed at 20 ° C. for 24 hours, and then steam-cured at 90 ° C. for 48 hours to obtain a cured product. The compressive strength of the cured product was measured in accordance with “JIS A 1108 (Concrete Compression Test Method)” and found to be 210 N / mm ² . In addition, this compressive strength is an average value of three hardening bodies.
(Bending strength)
The blend was poured into a 4 × 4 × 16 cm mold, pre-positioned at 20 ° C. for 24 hours, and then steam-cured at 90 ° C. for 48 hours to obtain a cured product. The bending strength of the cured product was measured in accordance with “JIS R 5201 (cement physical test method)” and found to be 47 N / mm ² . In addition, this bending strength is an average value of three hardening bodies. The loading conditions in the measurement were four-point bending with a distance between the lower fulcrums of 12 cm and a distance between the upper fulcrums of 4 cm.

[Example 1]
2. The length of 1,650 mm, the width of 400 mm, and the thickness of 40 mm (in the thickness direction, 164 columnar projections having a height of 0.5 mm and a diameter of 28 mm are formed on one side of the panel. 164 recesses having a depth of 0.5 mm and a diameter of 28 mm are uniformly formed.) After being placed at 20 ° C. for 24 hours and then steam-cured at 90 ° C. for 48 hours. Then, it demolded and the hardening body 1 which has the said shape was obtained.
Next, an acrylic resin adhesive (trade name: Hard Rock II) is applied to the entire surface of the transparent acrylic plate (thickness 5 mm) larger in size than the panel so as to have a thickness of 2 mm, The panel was adhered to the coated surface. The test body was obtained by leaving still at 30 degreeC for 24 hours. About this test body, it observed from the back side of the acrylic board, and measured the area ratio of the air pocket with respect to the area of a panel.
As a result, the area ratio was 4%.
[Comparative Example 1]
An experiment was conducted in the same manner as in Example 1 except that a panel having a flat surface (length 1,650 mm, width 400 mm, thickness 40 mm) having no columnar convex portions was used.
As a result, the area ratio was 36%.

[Example 2]
A specimen was prepared in the same manner as in Example 1 except that a steel plate (thickness 9 mm) having a size larger than that of the panel was used instead of the transparent acrylic plate. A core having a diameter of 10 cm was removed at any 10 locations on the specimen. Using these cores (10 pieces), the adhesion strength between the panel and the steel plate was measured according to the Kenken-type adhesion test.
As a result, the adhesion strength was in the range of 4.24 to 5.12 N / mm ² , and the average value was 4.6 N / mm ² .
[Comparative Example 2]
A specimen was prepared in the same manner as in Comparative Example 1 except that a steel plate (thickness 9 mm) having a size larger than that of the panel was used instead of the transparent acrylic plate. A core having a diameter of 10 cm was pulled out at any 10 positions of the test body. Using these cores (10 pieces), the adhesion strength between the panel and the steel plate was measured according to the Kenken-type adhesion test.
As a result, the adhesion strength was in the range of 1.22 to 4.56 N / mm ² , and the average value was 3.7 N / mm ² .
From the above results, in Examples 1 and 2 using a panel having a plurality of columnar convex portions, compared with Comparative Examples 1 and 2 using a panel having a flat surface, air was laid when laying the panel. It can be seen that the pool is difficult to form, and the adhesion strength between the panel and the adherend (the steel plate in the above experiment; the deck plate in practical use) is increased.

It is sectional drawing which shows the steel deck structure of this invention typically. It is a perspective view which shows an example of the panel used for this invention. It is a perspective view which shows an example of the panel used for this invention. It is a figure which shows the procedure of the reinforcement construction method of the steel deck structure of this invention. It is a perspective view which shows typically an example of a general steel deck structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel floor slab structure 2 Adhesive layer 3 Panel 4 Thin layer pavement 5 One side 6 Convex part 7 Coating film which consists of adhesives 100 Steel floor slab structure 102 Deck plate 104 Vertical rib 106 Horizontal rib 108 Pavement 110 Main girder A Reference plane B Upper surface of convex part or lower surface of concave part h Height of convex part or concave part

Claims (4)

A deck plate, a plurality of vertical ribs extending in parallel to the longitudinal direction of the bridge on the lower surface of the deck plate, and a lateral rib extending across the vertical rib perpendicular to the longitudinal direction of the bridge And a steel floor slab structure of a bridge including a pavement provided above the deck plate,
Between the pavement and the deck plate, compressive strength and flexural strength is 120 N / mm ² or more is from 30 N / mm ² or more cementitious hardened body, the convex portion of less height of 2mm on at least one surface and / or It has a reinforcing structure portion in which a panel having a concave portion is laid on the upper surface of the deck plate via an adhesive layer so that the deck plate and the surface having the convex portion and / or the concave portion of the panel face each other. Steel floor slab structure characterized by that. Wherein the panels, cement, fine powder of BET specific surface area of 5~25m ² / g, the inorganic powder Blaine specific surface area of 3,500~10,000cm ² / g, a maximum particle size of 2mm or less fine aggregate, water reducing The steel slab structure according to claim 1, comprising a hardened body of a blend containing an agent, fibers, and water.   The steel floor slab structure according to claim 1 or 2, wherein the adhesive layer is a layer made of a cured product of an acrylic resin adhesive. A deck plate, a plurality of vertical ribs extending in parallel to the longitudinal direction of the bridge on the lower surface of the deck plate, and a lateral rib extending across the vertical rib perpendicular to the longitudinal direction of the bridge In the steel plate slab reinforcement construction method of the bridge including the pavement provided above the deck plate,
After removing at least a part of the pavement and exposing the upper surface of the deck plate, an adhesive is applied to the upper surface of the deck plate,
The adhesive on the upper surface of the applied the deck plate, the compressive strength of 120 N / mm ² or more and flexural strength is from 30 N / mm ² or more cementitious cured material, at least the height 2mm or less of the protrusions and on one side And / or laying the panel having a recess so that the surface of the panel having the protrusion and / or the recess faces the deck plate,
A steel slab reinforcement method, characterized in that a thin layer pavement is formed on the upper surface of the panel that has been spread, and the panel is embedded.

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