JP4093428B2 - High-strength reinforced concrete precast plate - Google Patents

Description

  The present invention relates to a high-strength reinforced concrete precast plate (hereinafter referred to as a high-strength RC / PCa plate), and in particular, a high-speed concrete pavement capable of rapid construction in a wide range of places such as an airport apron and a taxiway. It relates to the strength RC / PCa plate.

In conventional airport pavement, post-tension prestressed concrete pavement is mainly performed.
JP-A-63-107638 November 20, 1993, Gihodo Publishing Co., Ltd. "Civil Engineering Handbook 4th Edition" (I pages 994-995, column of post tension system) This construction procedure will be described with reference to FIG.

1: A roadbed such as excavation in the pavement area is performed (step S1).
2: Formwork is installed in the periphery for placing concrete in the pavement area (step S2).
3: A polyethylene sheet or the like is laid on the roadbed in order to prevent leakage of the grout material in the roadbed (step S3).
4: A sheath tube and a reinforcing bar for introducing prestress are disposed in the pavement region, and a PC steel strand is inserted into the sheath tube (step S4).
5: Concrete is spread and leveled in the pavement area (step S5).
6: Concrete compaction and rough finishing (step S6).
7: Curing concrete is performed (step S7).
8: Prestress is introduced into the concrete (step S8).
9: A grout material is filled between the concrete and the roadbed (step S9).
10: Completion of concrete pavement (step S10).
The concrete pavement has the following characteristics.

1: Since resistance to bending is extremely large, cracks are unlikely to occur.
2: The concrete thickness is thin (about 180 mm).
3: Large deformation capability.
4: There are few joints. Telescopic joints are installed at intervals of about 100 m.

  The above-mentioned conventional concrete pavement requires a preparatory work such as the installation of a sheath tube for introducing pre-stress and insertion of a strand of PC steel, and it is hardened to wait for the generation of concrete strength and to be hit in the heat and cold. Since pre-stress is introduced through the curing in the case of installation, the construction period becomes long and the construction cost is high. Furthermore, it is very difficult to control the quality of the concrete due to the concrete placement on site. Also, the installation of expansion joints was very expensive.

  Therefore, the construction cost can be reduced by maintaining a strength equal to or higher than that of post-tensioned prestressed concrete pavement, requiring no large-scale equipment such as prestressing equipment, and enabling rapid construction of concrete pavement, which greatly reduces the construction period. The technical problem which should be solved in order to obtain the high intensity | strength RC * PCa plate which contributes to a down arises, and this invention aims at solving this problem.

The present invention has been proposed to achieve the above object, and is a rectangular plate-shaped precast plate laid for paving on the upper surface of the laying roadbed, and has a predetermined interval in the width direction of the precast plate. And two main reinforcing bars on the upper surface side parallel to the longitudinal direction are arranged, and one main reinforcing bar on the lower surface side is arranged in the middle in the width direction of the upper surface side main reinforcing bar. A horizontal bar formed in an S-shaped corrugation that is fixed to the lower surface side main reinforcing bar by oblique bars arranged continuously in the longitudinal direction and that is continuous in the longitudinal direction from the upper surface side of the two main reinforcing bars on the upper surface side. The upper surface side main rebar, the lower surface side main rebar, the oblique rebar that fixes them, and the horizontal rebar constitute a truss rebar combined body having a triangular shape in cross section, and the truss rebar combined body is The precast plate is arranged at predetermined intervals in the width direction of the precast plate, and the precast plate High-strength reinforced concrete precast version and without be formed by Da設 the high-strength concrete,
Provided is a high-strength reinforced concrete precast plate obtained by applying a surface treatment by applying an acrylic, polyurethane or fluorine-based resin for preventing adhesion of a grout material to the lower surface of the high-strength reinforced concrete precast plate. .

  According to this configuration, the two main reinforcing bars on the upper surface side and the main reinforcing bar on the lower surface side are fixed by the oblique bars arranged continuously in the longitudinal direction, and from the upper surface side of the two main reinforcing bars on the upper surface side in the longitudinal direction. It is fixed by horizontal bars formed in a continuous S-shaped corrugated shape, and the upper surface side main reinforcing bars, the lower surface side main reinforcing bars, the oblique bars for fixing them, and the horizontal bars have a triangular shape in a sectional view. Constructing a truss rebar combined body, and arranging the truss rebar combined body at a predetermined interval in the width direction of the precast plate, the surface portion has high rigidity and can be easily subjected to external forces such as bending and twisting. Difficult to deform. Further, when the precast plate of the present invention is lifted up, the surface of the precast plate is coated with an acrylic resin or the like, and the surface treatment is performed, so that the grout material does not adhere to the lower surface of the precast plate.

As explained above, the high-strength reinforced concrete precast plate of the present invention is
Two main reinforcing bars on the upper surface side that are parallel to the longitudinal direction at predetermined intervals in the width direction of the precast plate are disposed, and one main reinforcing bar on the lower surface side is disposed in the middle of the upper surface side main reinforcing bars in the width direction. The two main reinforcing bars on the upper surface side and the lower main reinforcing bar are fixed by oblique bars arranged continuously in the longitudinal direction, and the S-shaped continuous in the longitudinal direction from the upper surface side of the two upper reinforcing bars on the upper surface side. A truss reinforcing bar combined with a triangular shape in cross section is formed by the horizontal bars formed in a corrugated shape, and the upper surface side main reinforcing bars, the lower surface side main reinforcing bars, the oblique bars that fix them, and the horizontal bars. The truss reinforcing bars are arranged at predetermined intervals in the width direction of the precast plate, and the precast plate is a high strength reinforced concrete precast plate formed by placing high strength concrete. The upper side main reinforcing bar withstands compression, while the lower side main reinforcing bar In addition to being able to withstand tension, these two main reinforcing bars are joined to the horizontal bars to form a truss reinforcing bar with a triangular shape in cross section. Can provide a tough precast version.

  In addition, since the surface of the precast plate is coated with an acrylic, polyurethane, or fluorine resin to prevent the adhesion of grout material, the roadbed is installed after installing the high-strength reinforced concrete precast plate. When the subsidence sinks, the filled grout material sinks together with the roadbed, but the high-strength reinforced concrete precast plate remains in its original position without sinking, so that the high-strength reinforced concrete precast plate and the original grout material submerged. It can be expected to produce an effect that it is possible to cope with the non-uniform settlement by newly injecting a grout material.

  In order to achieve the above object, the present invention is a rectangular plate-shaped precast plate laid for paving on the upper surface of a constructed roadbed, and is parallel to the longitudinal direction at a predetermined interval in the width direction of the precast plate. Two main reinforcing bars on the upper surface side are arranged, one main reinforcing bar on the lower surface side is arranged in the middle of the upper surface side main reinforcing bar in the width direction, and the two main reinforcing bars on the upper surface side and the lower main reinforcing bar are connected to each other. The upper surface is fixed by oblique bars arranged continuously in the longitudinal direction, and is fixed by horizontal bars formed in an S-shaped corrugation continuous in the longitudinal direction from the upper surface side of the two main reinforcing bars on the upper surface side. The side main reinforcing bars, the lower side main reinforcing bars, the oblique bars for fixing them, and the horizontal bars constitute a truss reinforcing bar combined with a triangular shape in cross section, and the truss reinforcing bar combined in the width direction of the precast plate And the precast plate is a high strength concrete. A high-strength reinforced concrete precast plate is formed by casting, and an acrylic, polyurethane-based or fluorine-based resin is applied to the bottom surface of the high-strength reinforced concrete precast plate to prevent adhesion of grout material. It was realized by providing a high-strength reinforced concrete precast plate characterized by being made of.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. FIG. 1 is a plan view showing a bar arrangement state of a high-strength RC / PCa plate 1. The upper part from the center line of FIG. 1 is a half of the longitudinal direction length of the high-strength RC / PCa plate 1 viewed from the lower surface, and the lower part from the center line of FIG. Half of the direction length is seen from above. 2 shows a side view in the longitudinal direction of FIG. 1, and FIG. 3 shows a sectional view in the width direction of FIG. The size of the high-strength RC / PCa plate 1 is, for example, a rectangle with a length in the longitudinal direction of 7.5 m and a length in the short side, that is, a width of 3.5 m in consideration of transportation to the construction site. It is formed in a plate shape and has a thickness of 0.2 m.

  In order to improve the deformation performance of the high strength RC / PCa plate 1, truss reinforcing bars 5, 5... Are arranged at predetermined intervals in the width direction of the high strength RC / PCa plate 1. As shown in FIG. 3, the truss rebars 5, 5... Have two main rebars 2 and 2 having a diameter of 10 mm on the upper surface side and one main rebar 3 having a diameter of 16 mm on the lower surface side. The cross section V is arranged with 125.5 mm intervals in the thickness direction, and oblique bars 4, 4... Having a diameter of 7 mm are fixed to the left and right of the main rebars 2, 2 on the upper surface side and the main rebar 3 on the lower surface side, respectively. The slant lines 4, 4... Are formed in a truss shape in the longitudinal direction as shown in FIG. The main rebars 2, 2... On the upper surface side act on the compression side, and the main rebars 3 on the lower surface side act on the tension side. The truss reinforcing bars 5, 5... Are preliminarily attached to the main reinforcing bars 2, 2 on the upper surface side, the main reinforcing bars 3 on the lower surface side, and the main reinforcing bars 3 on the lower surface side before being incorporated into the high-strength RC / PCa plate 1. The oblique lines 4 and 4 are formed integrally in the longitudinal direction.

  Further, upper longitudinal bars 6, 6... Having a diameter of 13 mm are disposed at predetermined intervals at positions parallel to the main reinforcing bars 2 and 2 on the upper surface side, and the upper longitudinal bars 6, 6. The upper horizontal stripes 7, 7 having a diameter of 13 mm are arranged, and the upper vertical stripes 6, 6, ... and the upper horizontal stripes 7, 7, ... are bound to each other by a binding line (not shown) or the like. Further, at a position parallel to the longitudinal direction of the main reinforcing bars 3, 3,... On the lower surface side, lower longitudinal bars 8, 8... With a diameter of 16 mm and lower horizontal bars 9, 9. The lower longitudinal bars 8, 8... And the lower horizontal bars 9, 9,... Are bound to each other by a binding line (not shown) or the like.

  FIG. 4 shows the truss reinforcement 5 further reinforced. As shown in FIG. 4A, an S-shaped continuous horizontal bar 40 in the longitudinal direction is fixed to the upper surface between the upper main bars 2 and 2 constituting the V-shaped truss bar 5. Form. Thus, by fixing the horizontal bar 40 from the upper surface side of the V-shaped truss reinforcing bar, the V-shaped truss reinforcing bar in which the left and right oblique bars 4 and 4 are continuously arranged and the V-shaped bar bar are provided. A truss rebar combined body having a triangular shape in a sectional view is constituted by the S-shaped continuous horizontal bars 40 fixed to the upper surface of the truss reinforcing bars. And such a truss reinforcing-bar combination is arrange | positioned by the predetermined direction in the width direction of this precast plate. The S-shaped horizontal stripes 40 may be formed continuously in an N shape.

  Next, on the four sides around the high-strength RC / PCa plate 1, the individual high-strength RC / PCa plates 1, 1... Therefore, as will be described later, cotter brackets 11, 11,... For attaching cotters 16, 16,. The cotter brackets 11, 11... Are installed at intervals of 750 mm in the longitudinal direction and 700 mm in the width direction of the high-strength RC / PCa plate 1. The high-strength RC / PCa plate 1 is a central portion in the width direction and in the vicinity of the truss reinforcing bar 5 and from both ends in the longitudinal direction of the high-strength RC / PCa plate 1. Lift-up jack attachment corresponding to when the roadbed G sinks after the high-strength RC / PCa plate 1 is laid at a position of a quarter of the longitudinal length of the PCa plate 1 as will be described later. Pipes 10 and 10 for mounting the jig 50 are installed.

  The pipes 10, 10 can also be used as hanging brackets when transporting the high-strength RC / PCa plate 1, and a cap (not shown) is screwed when not in use. Further, the pipe 10, 10,... Can be used as an injection hole and an air vent hole with a grout material between the pipe base G.

  After completing the installation of the bar arrangement and each metal fitting, high strength concrete R is cast using a mold (not shown) to complete the high strength RC / PCa plate 1. At that time, the main reinforcing bar 2 side which is the upper surface of the high-strength RC / PCa plate 1 is installed on the bottom plate of the mold.

  Accordingly, when the high-strength RC / PCa plate 1 is manufactured, the surface on the upper surface side of the high-strength RC / PCa plate 1 is directed downward when used in the field.

  Further, by disposing the striped steel plate or the like at the bottom of the formwork, the formwork is disassembled after curing the grooving R to increase the sliding resistance of the upper surface of the concrete of the high strength RC / PCa plate 1. It can be easily formed by itself, and there is no need to groove the concrete surface with a diamond cutter or the like as in the prior art, and any shape can be obtained by changing the shape of the plate arranged at the bottom of the formwork. It can also be formed by grooving. Further, the side plate of the mold is tapered in the vertical direction of the side portions 1a, 1a, 1b, 1b of the high-strength RC / PCa plate 1. As will be described later, this taper reduces the resistance force caused by the close contact between the high-strength RC / PCa plates 1 adjacent to each other so that the high-strength RC / PCa plates 1 can be quickly and partially replaced during use. It is provided in order to make the flow of rainwater smooth and after the laying of the high-strength RC / PCa plate 1.

  As the cast concrete, high strength concrete R having excellent durability and wear resistance and high bending strength (60 N / mm 2) is used. By using the high-strength concrete R, the conventional pavement prestressed concrete pavement can be dealt with by setting the pavement thickness 180 mm to 200 mm, and can be manufactured at a lower cost than the conventional concrete pavement.

  Further, after the high strength RC / PCa plate 1 is laid on the lower surface of the main reinforcing bar 3 on the lower surface side where the high strength concrete R is placed, a grout material (not shown) is provided between the lower strength G and the roadbed G. A surface such as an acrylic, urethane, or fluorine resin (not shown) that serves as an adhesion preventing material so that the grout material does not adhere to the lower surface of the high-strength RC / PCa plate 1 when filling Process. The effect of this surface treatment is that, after the high strength RC / PCa plate 1 is installed, when the roadbed G sinks improperly, the filled grout material sinks together with the roadbed G, but the high strength RC / PCa plate 1 Is intended to deal with by injecting a new grout material between the lower surface of the high-strength RC / PCa plate 1 and the original grout material that has settled so that it remains in its original position. .

  Further, the pumping phenomenon on the roadbed G side due to the laying weight of the high-strength RC / PCa plate 1, as will be described later, on the entire periphery of the side portions 1 a, 1 a, 1 b, 1 b of the high-strength RC / PCa plate 1. In order to prevent this, a sealing material 37 is attached. Next, the cotter bracket 11 and the cotter 16 for joining the high-strength RC / PCa plates 1 laid on the roadbed G will be described with reference to FIGS. The cotter bracket 11 is formed to have a C-shaped slot 12 having a cross-section, and the cotter brackets 11, 11 are opposed to each other and joined to each other in an H shape. The high-strength RC / PCa plates 1 and 1 are joined to each other. The cotter brackets 11, 11 of the cotter bracket 11 are connected to the inner surfaces 15, 15 of the cotter bracket 11 from the upper surface to the lower surface of the high strength RC / PCa plate 1 in the insertion direction of the cotter 16. A tapered surface inclined in a direction away from the outer surfaces 13, 13 of the cam lips 14, 14 facing each other is formed. Further, a screw portion 23 for a bolt 21 for fixing the cotter 16 is formed on the bottom portion 12a of the slot 12 of the cotter bracket 11.

  As described above, the cotter 16 is formed in a cross-section H-shape that can be inserted into the slots 12 and 12 facing each other with the cotter brackets 11 and 11 facing each other. The inner surfaces 18, 18, 18, 18 of the left and right coupling flanges 19, 19 have the same taper angle as the tapered surfaces of the inner surfaces 15, 15 of the cam lips 14, 14 of the cotter brackets 11, 11, and the height in the insertion direction. Strength A taper surface inclined in a direction approaching the outer surfaces 17 and 17 of the coupling flanges 19 and 19 from the upper surface to the lower surface of the RC / PCa plate 1 is formed. Further, a bolt hole 22 for inserting a bolt 21 for fixing the cotter 16 to the cotter bracket 11 is opened near the center of the coupling flange 19 of the cotter 16.

  In the above configuration, when the high-strength RC / PCa plates 1 and 1 are opposed to each other, the cotter brackets 11 and 11 are also opposed to each other. The cotter 16 is inserted into the cotters 12 and 12, the cam lips 14 and 14 of the cotter brackets 11 and 11 are fastened by the coupling flanges 19 and 19 of the cotter 16, and the bolts 21 and 21 are attached from the upper surface of the cotter 16. Is inserted into the screw portion 23 of the bottom portion 12a of the cotter bracket 11, 11, and the high-strength RC / PCa plates 1, 1 are coupled to each other via the cotter 16.

  The upper surface mounting position of the cotter bracket 11 is a position lower than the upper surface position of the high-strength RC / PCa plate 1 by chamfering 1c (25 mm), and the outer surface 13 of the cotter bracket 11 is also When the anchor rebar is tapered to 1a, 1a, 1b, 1b as a position 0.5 mm to 1 mm away from the side portions 1a, 1a, 1b, 1b of the high strength RC / PCa plate 1, the cotter bracket 11 is installed perpendicularly to the tapered surfaces of the side portions 1a, 1a, 1b, 1b.

  Next, a lift-up method of the high-strength RC / PCa plate 1 to cope with the case where the subbase G undergoes subsidence or the like after laying the high-strength RC / PCa plate 1 according to FIGS. explain. As described above, the pipes 10 and 10 for attaching the lift-up jack attaching jig 50 to the center portion in the width direction of the high-strength RC / PCa plate 1 and spaced at a distance of 4.5 m in the longitudinal direction. Is buried vertically in the concrete. The pipe 10 has a thickness of 12 mm. As shown in FIG. 6, an inner diameter on the upper surface side of the high-strength RC / PCa plate 1 is engraved on the shaft portion 54 of the lift-up jack mounting jig 50. A trapezoidal screw 54a that is screwed into the existing screw is engraved. The upper surface of the pipe 10 is set to a position lowered by a chamfer 1c from the concrete surface of the high-strength RC / PCa plate 1.

  FIG. 7 shows the lift-up jack mounting jig 50. The upper portion is a lift-up jack 51 mounting portion in which the upper surface plate 50a and the lower surface plate 50c are square, and the left and right side plates 50b, 50b are rectangular. Consists of a shaft portion 54 that is vertically fixed to the lower portion of the lower surface plate 50c. A trapezoidal screw 54a that engages with the pipe 10 installed on the high-strength RC / PCa plate 1 is engraved on the lower outer diameter of the shaft portion 54. Further, a rod hole 55 through which the rod 53 that transmits the extension force of the lift-up jack 51 to the roadbed G is opened at the center of the lower surface plate 50 c and the shaft portion 54. A jack receiver 52 for installing the lift-up jack 51 is provided on the upper portion of the rod 53.

  After attaching the lift-up jack mounting jig 50 to the pipe 10 of the high-strength RC / PCa plate 1, the rod 53 of the rod 53 installed between the lift-up jack mounting jig 50 and the roadbed G is used. When the lift-up jack 51 is set between the jack receiver 52 and the upper surface plate 50a and the lift-up jack 51 is extended, the lift-up jack is attached by taking a reaction force against the roadbed G via the rod 53. As the jig 50 rises, the high-strength RC / PCa plate 1 rises. Thereafter, a grout material (not shown) is filled between the lower surface of the high-strength RC / PCa plate 1 and the roadbed G to cope with the subsidence of the roadbed G.

  In addition, when the roadbed construction for laying the high-strength RC / PCa plate 1 is performed, the high-strength RC / PCa plate 1 is laid in the roadbed G in advance along the laying direction of the high-strength RC / PCa plate 1. A lift-up support plate 31 made of a steel plate is continuously embedded in a rail shape and horizontally in a position corresponding to the pipe 10 of the plate 1. The lift-up support plate 31 has a predetermined width in the longitudinal direction of the high-strength RC / PCa plate 1, and the upper surface thereof coincides with the upper surface of the roadbed G, and the lower portion thereof has a predetermined interval in the width direction. Anchors 32 and 32 for preventing movement in the roadbed G are provided.

  Next, a polyethylene sheet 30 is laid on the roadbed for preventing leakage of the grout material in the roadbed R. The polyethylene sheet 30 has an overlap allowance of a predetermined length, and a polyethylene film is used for the joining. Further, since the polyethylene sheet 30 may be damaged by the tip of the rod 53 of the lift-up jack mounting jig 50 at the upper part of the lift-up support plate 31, the lift-up support plate A cushion material 33 made of a nonwoven fabric sheet is stuck along the longitudinal direction of 31.

  Next, the taper provided on the side portions 1a, 1a, 1b, 1b of the high-strength RC / PCa plate 1 will be described with reference to FIG. As shown in FIG. 8 (a), the taper is constructed by continuously laying the high-strength RC / PCa plate 1 and then applying gradients α and α (1%) from the crown portion 34 to both sides to smoothly drain rainwater. Provided for draining. The taper angle β of the joint surface of the side portion 1a in the longitudinal direction and the side portion 1b in the width direction of the high-strength RC / PCa plate 1 at the crown portion 34 is as shown in FIG. An angle obtained by adding the gradient α to the squareness from the lower surface of the side portion 1 of the high-strength RC / PCa plate 1 is used.

  Further, in order to facilitate partial replacement of the laid high strength RC / PCa plate 1, the side portions 1b, 1b in the width direction of the high strength RC / PCa plate 1 as shown in FIG. A draft γ is given to the joint surfaces 35 of each other. The draft γ is attached to a vertical line from the lower surface of the high-strength RC / PCa plate 1 along the gradient α from the crown portion 34 and takes an angle larger than the gradient α. .8 ° is acceptable.

  On the other hand, the taper of the side portion 1a in the longitudinal direction of the high-strength RC / PCa plate 1 is provided only on the crown portion 34 side as described above, and the opposite side portion 1a is a plane perpendicular to the gradient α. To form. The taper mounting position, gradient, and the like are appropriately determined by the concrete pavement design using the high-strength RC / PCa plates 1, 1.

  Next, the water stop method for the side portions 1a and 1b of the high-strength RC / PCa plate 1 will be described with reference to FIG. When the high-strength RC / PCa plates 1, 1... Are laid, the pumping phenomenon generated on the roadbed G side due to the weight of the high-strength RC / PCa plates 1, 1 A seal groove having a hexagonal cross section in the joint surface of the side portions 1a and 1b of the high-strength RC / PCa plate 1 in the vicinity of the lower surface of the high-strength RC / PCa plate 1 in order to stop intruding water. 36 is formed. The seal groove 36 is provided over the entire circumference of the side portions 1a and 1b of the high-strength RC / PCa plate 1, and a modified silicone-based seal material 37 is stuck in the seal groove 36 to cause a pumping phenomenon. Water is stopped from the bottom by rainwater and rainwater from the top.

  In addition, the size of the high strength RC / PCa plate, the size of the reinforcing bar, the mounting interval of the cotter bracket, etc. shown in the embodiment are not limited to this, and the high strength RC / PCa plate is not limited thereto. It will be changed as appropriate according to the design.

  Thus, the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The reinforcement arrangement | positioning figure which shows one Example of this invention, and shows the reinforcement arrangement | positioning which the upper part from the centerline looked at the bottom view, and the reinforcement arrangement figure which the lower part from the centerline looked at the top view. FIG. II sectional drawing of FIG. (A) The top view which shows another truss reinforcement. FIG. 4B is a cross-sectional view of the wafer shown in FIG. (A) The top view which shows the combined state in a cotter. FIG. 5B is a diagram as viewed from the arrow in FIG. 5A. The side view of the lift-up state of the high strength RC / PCa plate. (A) Side view of lift-up jack mounting jig. (B) The ho-ho arrow figure of Fig.7 (a). (C) FIG. 7A is a view taken in the direction of arrows. (A) The side view of the laying state of high strength RC * PCa plate. (B) The detail of the crown part of Fig.8 (a). (C) The detail of the other joint surface of Fig.8 (a). The sectional side view which shows the installation state of a sealing material. The flowchart figure of the conventional concrete pavement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High-strength RC / PCa plate 1a, 1b Side 2 Main rebar on the upper surface side 3 Main rebar on the lower surface side 4 Oblique rebar 5 Truss rebar 10 Pipe 11 Cutter bracket 12 Groove hole 12a Bottom 16 Cotter 19 Coupling flange 21 Bolt 22 Bolt Hole 23 Screw part 36 Seal groove 37 Sealing material 40 Horizontal bar G Roadbed R High-strength concrete

Claims (1)

A rectangular plate-shaped precast plate laid on the upper surface of the constructed laying roadbed for paving, with two main reinforcing bars on the upper surface side parallel to the longitudinal direction at predetermined intervals in the width direction of the precast plate. And one main reinforcing bar on the lower surface side is arranged in the middle of the upper surface side main reinforcing bar in the width direction, and the two main reinforcing bars on the upper surface side and the lower main reinforcing bar are continuously arranged in the longitudinal direction. The upper surface side main reinforcing bars and the lower surface side main reinforcing bars are fixed by horizontal bars formed in an S-shaped corrugation continuous in the longitudinal direction from the upper surface side of the two upper surface side main reinforcing bars. Forming the truss rebar combined body having a triangular shape in a cross-sectional view with the oblique line and the horizontal line to fix the etc., and arranging the truss rebar combined body at a predetermined interval in the width direction of the precast plate, In addition, the precast plate is a high-strength reinforcing steel core formed by placing high-strength concrete. Cleat precast version and without,
A high-strength reinforced concrete precast plate obtained by applying an acrylic, polyurethane or fluorine-based resin for preventing adhesion of grout material to the lower surface of the high-strength reinforced concrete precast plate.