JP3778334B2 - Measures for settlement of high strength reinforced concrete precast plate. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a settlement countermeasure for a high-strength reinforced concrete precast plate (hereinafter referred to as a high-strength RC / PCa plate), particularly in a wide range of areas such as an apron and a taxiway at a marine airport constructed on soft ground. The present invention relates to a subsidence countermeasure method for a high strength RC / PCa plate when a concrete pavement is constructed with a high strength RC / PCa plate.
[0002]
[Prior art]
In conventional airport pavement, post-tension prestressed concrete pavement is mainly performed.
[0003]
This construction procedure will be described with reference to FIG.
[0004]
1: A roadbed such as excavation in the pavement area is performed (step S ₁ ).
2: Formwork is installed around the concrete for placing concrete in the pavement area (step S ₂ )
3: laying polyethylene sheet or the like on the roadbed Engineering to prevent leakage of the grout in the subgrade (Step S ₃₎
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 S ₄ ).
5: leveled laying concrete pavement area (step S ₅₎
6: compacted concrete tightening, the roughing (Step S ₆₎
7: do the curing of concrete (step S ₇₎
8: Prestress is introduced into the concrete (step S ₈ )
9: Fill grout material between concrete and roadbed (step S ₉ )
10: Concrete paving completed (step S ₁₀₎
[0005]
[Problems to be solved by the invention]
The concrete pavement of the above-mentioned conventional example requires preparatory work such as the placement of a sheath tube for introducing prestress, insertion of strands of PC steel, etc., as well as curing that waits for the generation of concrete strength, as well as in the heat and cold Since pre-stress is introduced after curing, the construction period becomes longer and the construction cost increases. Moreover, since the concrete placement area on site is large, quality control of the concrete has been extremely difficult. Furthermore, when the concrete pavement has sunk after construction on soft ground or the like, it has been necessary to perform extensive repair work as a whole.
[0006]
Therefore, it has the same or better strength as post-tension prestressed concrete pavement, and does not require large-scale facilities such as prestressing equipment, enabling rapid construction of concrete pavement and the cost of construction cost due to drastic reduction of construction period. Contributing to downtime, and further, technical problems to be solved in order to obtain a subsidence method for high-strength RC / PCa plates that can be repaired partially and easily when concrete pavement sinks after construction. The present invention aims to solve this problem.
[0007]
[Means for Solving the Problems]
The present invention has been proposed to achieve the above object, and is a concrete pavement in which rectangular plate-like or square plate-like high-strength reinforced concrete precast plates are laid on the upper surface of the constructed laying roadbed, A lift-up support plate is embedded in the roadbed along the laying direction of the high-strength reinforced concrete precast plate and at a position corresponding to a pipe for a lift-up jack mounting jig provided on the high-strength reinforced concrete precast plate. When the high-strength reinforced concrete precast plate sinks, a lift-up jack mounting jig is attached to the pipe, and then the lift-up jack is operated to apply the reaction force of the lift-up jack to the lift-up support plate. High strength reinforced concrete that raises the high strength reinforced concrete precast plate In the subsidence measures method of over door precast version,
After embedding the lift-up support plate, together with the laying polyethylene sheet for preventing grout leakage in the lift-up the support plate as well as on the roadbed engineering, on a polyethylene sheet is laid on the lift-up the support plate on The non-woven fabric sheet is attached, and the lift-up jack mounting jig has a top plate and a bottom plate formed in a square shape, and opposing side plates are formed in a rectangular shape having a predetermined length. A lift-up jack mounting portion for inserting the lift-up jack from the bottom, and a lower portion comprising a shaft portion vertically fixed to a lower portion of the lower surface plate, and a trapezoidal screw that is screwed to the pipe on the lower outer diameter of the shaft portion A rod hole that penetrates the rod that transmits the extension force of the lift-up jack to the roadbed is formed in the lower plate and the central portion of the shaft portion , and the lift is formed on the upper portion of the rod. up There is provided a sinking measures method of high strength reinforced concrete precast plate formed by providing a jack receiving for installing Yakki.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 (a) is a plan view of a high-strength RC / PCa plate 1 whose size is a rectangular plate having a longitudinal length of 7.5 m and a width of 3.5 m in consideration of transportation to a construction site, for example. The thickness is 0.2 m. FIG. 1B is a cross-sectional view showing a bar arrangement state in the longitudinal direction, and FIG. 1C is a cross-sectional view showing a bar arrangement state in the width direction.
[0009]
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. 1 (c), the truss rebars 5, 5... Are separated by two main rebars 2 and 2 having a diameter of 70 mm on the upper surface side and one main rebar having a diameter of 16 mm on the lower surface side. 3 are arranged at intervals of 125.5 mm 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 and 2 on the upper surface side and the main rebar 3 on the lower surface side, respectively. The oblique stripes 4, 4... Are formed in a truss shape in the longitudinal direction as shown in FIG. The main reinforcing bars 2 and 2 on the upper surface side act as the compression side, and the main reinforcing bar 3 on the lower surface side acts as the reinforcing bar 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.
[0010]
Further, upper longitudinal bars (not shown) having a diameter of 13 mm are arranged at predetermined intervals at positions parallel to the main reinforcing bars 2 and 2 on the upper surface side, and the upper longitudinal bars and a grid of 13 mm in diameter are arranged. An upper horizontal line (not shown) is provided, and the upper vertical line and the upper horizontal line are bound to each other by a binding line (not shown) or the like. Further, lower longitudinal bars (not shown) having a diameter of 16 mm are arranged at predetermined intervals in positions parallel to the longitudinal direction of the main reinforcing bars 3, 3,. A lower horizontal stripe (not shown) of 16 mm is disposed, and the lower vertical stripe and the lower horizontal stripe are bound to each other by a binding line (not shown) or the like.
[0011]
Next, on the four sides around the high-strength RC / PCa plate 1, the individual high-strength RC / PCa plates 1, 1... For this purpose, cotter brackets 7, 7... For attaching a cotter (not shown) having an H-shaped cross section are installed. The cotter brackets 7, 7... 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. In addition, the high-strength RC / PCa plate 1 was laid at the center in the width direction of the high-strength RC / PCa plate 1 at a position spaced by 4.5 m in the longitudinal direction, as will be described later. Thereafter, pipes 6 and 6 for installing a lift-up jack mounting jig 15 to be described later are installed to cope with the case where the roadbed G causes uneven settlement or the like. The pipes 6 and 6 can also be used as suspension fittings when the high-strength RC / PCa plate 1 is conveyed, and a cap (not shown) is screwed when not in use. Furthermore, the pipes 6 and 6 are also used as injection holes and air vent holes when a grout material (not shown) is injected between the high-strength RC / PCa plate 1 and the roadbed G. To do.
[0012]
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.
[0013]
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.
[0014]
Further, by providing a striped steel plate or the like at the bottom of the formwork, a grooving (not shown) for increasing the slip resistance of the upper surface of the concrete of the high-strength RC / PCa plate 1 can be provided. The grooving can be easily formed simply by dismantling the formwork after curing the high-strength concrete R, and there is no need to groove the concrete surface with a diamond cutter or the like as in the prior art. Any shape of grouping can be formed by changing the shape of the plate disposed on the bottom of the plate.
[0015]
Further, the side plate of the mold is tapered (not shown) in the vertical direction of the side portions 1a, 1a, 1b, 1b of the high-strength RC / PCa plate 1. This taper is designed to reduce 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 plate 1 can be quickly and partially replaced during use. And the high-strength RC / PCa plate 1 is provided to smoothly flow rainwater after the installation. The mounting position and gradient of the taper are appropriately determined by the concrete pavement design using the high-strength RC / PCa plates 1, 1.
[0016]
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. In addition, when 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, the grout material is filled with the roadbed G. A surface treatment such as applying an acrylic, urethane, or fluorine resin (not shown) as an adhesion preventing material to prevent the grout material from adhering to the lower surface of the high-strength RC / PCa plate 1 is performed. . The effect of this surface treatment is that, after the high strength RC / PCa plate 1 is installed, when the roadbed G sinks unevenly, 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 entire circumference of the side portions 1a, 1a, 1b, 1b of the high-strength RC / PCa plate 1 is from the lower surface due to the pumping phenomenon on the roadbed G side due to the laying weight of the high-strength RC / PCa plate 1. A denatured silicone-based sealing material (not shown) is attached to stop water and stop rain such as rainwater from the upper surface.
[0017]
Next, a method for laying the high-strength RC / PCa plates 1, 1... Will be described with reference to FIG. FIG. 2 is a plan view showing a state in which the high-strength RC / PCa plates 1, 1. First, the roadbed construction in the pavement region T is performed. At that time, as shown in FIG. 3, 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. Lift-up support plates 12 and 12 made of steel plates are continuously arranged in a rail shape horizontally at positions corresponding to pipes 6 and 6 for mounting a lift-up jack mounting jig 15 described later provided on the PCa plate 1. Either embed or bury at a predetermined location. The lift-up support plates 12 and 12 have a predetermined width in the longitudinal direction of the high-strength RC / PCa plate 1, and the upper surface thereof is installed so as to coincide with the upper surface of the roadbed G.
[0018]
Next, a polyethylene sheet 11 is laid on the roadbed in order to prevent the grout material from leaking into the roadbed G. The polyethylene sheet 11 overlaps with a predetermined length, and a polyethylene film is used for the joining. In addition, the polyethylene sheet 11 may be damaged by the tip of the rod 18 of the lift-up jack mounting jig 15 described later at the upper part of the lift-up support plates 12, 12. The cushion material 14 which consists of a nonwoven fabric sheet is affixed along the longitudinal direction of the support plates 12 for 12 use.
[0019]
Thereafter, the high-strength RC / PCa plate 1 is temporarily placed in a temporary storage place A near the pavement region T using a crawler crane or a truck crane C. At that time, a board (not shown) is installed below the high-strength RC / PCa plate 1 in order to maintain a landing height H of an air bearing 8 to be described later, or a level adjusting bracket (not shown). ) Is used to set the high-strength RC / PCa plate 1 on the roadbed G. The pavement region T is formed by placing 10 high-strength RC / PCa plates in the longitudinal direction X of the high-strength RC / PCa plate 1 and 30 sheets in the width direction Y to form one block. Complete the pavement.
[0020]
The laying order of the high-strength RC / PCa plate 1 is the foremost in the width direction Y of the pavement region T, and is continuously laid in a column from the leftmost end of the longitudinal direction X toward the lower side of the figure. When the laying of the row is completed, the next row on the right side is continuously laid from the upper side to the lower side of the figure. In the same manner, the high-strength RC / PCa plates 1, 1... Are laid in the pavement region T while successively forming columns in the X direction.
[0021]
When the high-strength RC / PCa plate 1 is moved from the temporary storage site A into the pavement region T, as shown in FIG. Four sets of the air bearings 8 are set at positions where the weight of the RC / PCa plate 1 can be shared equally. As shown on the left side of the center line of FIG. 3B, the air bearing 8 is in contact with the roadbed G when the air bearing 8 is air-off, and the lower surface of the high-strength RC / PCa plate 1 and the landing Hold height H (75 mm). Thereafter, as shown on the right side of the center line of FIG. 3B, compressed air is supplied from the air supply hole 9 of the air bearing 8 so that the air bearing 8 is in an air-on state, and the air bearing 8 The high-strength RC / PCa plate 1 is moved while being pushed by a winch (not shown) or manually. When the high-strength RC / PCa plate 1 is moved, if a rubber sheet, a thin steel plate or the like is laid on the roadbed G, the movement can be performed smoothly.
[0022]
After the high-strength RC / PCa plate 1 is transported to a predetermined position in the pavement region T, the air bearing 8 is removed from the lower portion of the high-strength RC / PCa plate 1 using the level adjusting bracket. Used when moving the high strength RC / PCa plate 1. By using the air bearing 8, the high-strength RC / PCa plate 1 can be smoothly moved into the pavement region T, and no crane for movement is required, and only one crawler crane C is provided in the temporary storage site A. Just install it.
[0023]
Next, a method for coupling the high-strength RC / PCa plates 1 and 1 laid on the roadbed G will be described. The laying height of each high-strength RC / PCa plate 1, 1... Is adjusted using the level adjusting bracket, and the cotter brackets 7, 7. Make them confront. The cotter brackets 7, 7... Are formed to have a C-shaped slot, and the cotter brackets 7, 7. A cotter (not shown) having an H-shaped cross section is vertically inserted into the slot to join the high-strength RC / PCa plates 1 and 1 together.
[0024]
Next, after the laying of the high strength RC / PCa plate 1 according to FIGS. 4 and 5, a lift-up method of the high strength RC / PCa plate 1 to cope with the case where the subbase G undergoes subsidence etc. explain. Pipes 6 and 6 for attaching the lift-up jack attachment jig 15 to the center of the high-strength RC / PCa plate 1 in the width direction at a distance of 4.5 m in the longitudinal direction are placed in the concrete. Buried vertically. The pipe 6 has a thickness of 12 mm. As shown in FIG. 4, the inner diameter of the upper surface side of the high-strength RC / PCa plate 1 is engraved on the shaft portion 19 of the lift-up jack mounting jig 15. A trapezoidal screw 19a that is screwed into the existing screw is engraved. The upper surface of the pipe 6 is set to a position lowered by a chamfer 1c from the concrete surface of the high-strength RC / PCa plate 1.
[0025]
FIG. 5 shows the lift-up jack mounting jig 15, the upper surface plate 15 a and the lower surface plate 15 c are formed in a square shape, and the left and right side plates 15 b and 15 b are formed in a rectangular shape having a predetermined length. The lift-up jack mounting portion into which the lift-up jack 16 can be inserted from the side between the side plates 15b, 15b shown in FIG. 2), and the lower portion is composed of a shaft portion 19 that is vertically fixed to the lower portion of the lower surface plate 15c. A trapezoidal screw 19a that is screwed with the pipe 6 installed on the high-strength RC / PCa plate 1 is formed on the lower outer diameter of the shaft portion 19. Further, a rod hole 20 through which the rod 18 that transmits the extension force of the lift-up jack 16 to the roadbed G is opened at the center of the lower surface plate 15c and the shaft portion 19. A jack receiver 17 for installing the lift-up jack 16 is provided on the upper portion of the rod 18.
[0026]
After the lift-up jack mounting jig 15 is attached to the pipe 6 of the high-strength RC / PCa plate 1, the rod 18 installed between the lift-up jack mounting jig 15 and the roadbed G When the lift-up jack 16 is set between the jack receiver 17 and the upper surface plate 15a, and the lift-up jack 16 is extended, the reaction force is applied to the roadbed G via the rod 18, and the lift-up jack is attached. As the jig 15 rises, the high-strength RC / PCa plate 1 rises through the pipe 6 screwed into the shaft portion 19 of the lift-up jack mounting jig 15. The lift-up jack 16 uses a hydraulic jack and is connected to a manual pump (not shown) with a hydraulic hose (not shown). 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.
[0027]
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.
[0028]
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.
[0029]
【The invention's effect】
As described above, the present invention performs concrete pavement by laying a high-strength reinforced concrete precast plate on the roadbed, enabling rapid construction of the concrete pavement, and greatly shortening the construction period and reducing the construction cost.
Furthermore, since the lift-up support plate is embedded in the roadbed in the direction in which the high-strength reinforced concrete precast plate is laid in advance, the lift-up reaction force when the high-strength reinforced concrete precast plate causes uneven subsidence etc. The roadbed will not be damaged by the overall pressure.
Then, after embedding the lift-up support plate, a polyethylene sheet for preventing leakage of grout material is laid on the lift-up support plate and the roadbed , and further, the lift-up support plate is laid on the lift-up support plate . Since the non-woven fabric sheet is stuck on the polyethylene sheet, the non-woven fabric prevents the grouting material from leaking into the roadbed and damages the polyethylene sheet by the rod tip of the lift-up jack mounting jig. This can be prevented by the cushioning properties of the seat and can effectively prevent leakage of the grout material.
Moreover, since the lift-up is performed using the pipes of the individual high-strength reinforced concrete precast plates, the repair work can be performed partially and easily with respect to the settlement of the concrete pavement.
[Brief description of the drawings]
FIG. 1A is a plan view of a high-strength RC / PCa plate according to an embodiment of the present invention.
(B) The bar arrangement of the II cross section of FIG.
(C) The bar arrangement of the roll cross section of FIG.
FIG. 2 is a plan view showing a laying state of a high-strength RC / PCa plate.
3A is a plan view showing a state in which an air bearing and a lift-up support plate are installed on the lower surface of a high-strength RC / PCa plate. FIG.
FIG. 3B is a side view of the air bearing of FIG. 3A, the left side of the center line showing when the air bearing is air-off, and the right side showing when the air is on.
FIG. 4 is a side view showing a lift-up state of a high-strength RC / PCa plate.
FIG. 5A is a side view showing a lift-up jack mounting jig.
(B) The view of the knee arrow of FIG.
(C) Ho-ho arrow view of FIG.
FIG. 6 is a flowchart of a conventional concrete pavement.
[Explanation of symbols]
1 High-strength RC / PCa plate 6 Pipe 12 Lift-up support plate 15 Lift-up jack mounting jig 16 Lift-up jack G Roadbed

Claims (1)

A concrete pavement in which rectangular plate-shaped or square plate-shaped high-strength reinforced concrete precast plates are laid side by side on the upper surface of the constructed roadbed, in advance along the laying direction of the high-strength reinforced concrete precast plates in the roadbed, and A lift-up support plate is embedded in a position corresponding to a pipe for a lift-up jack mounting jig provided on the high-strength reinforced concrete precast plate, and the pipe is lifted up when the high-strength reinforced concrete precast plate sinks. Subsidence of the high-strength reinforced concrete precast plate that attaches the jack mounting jig and then operates the lift-up jack to take the reaction force of the lift-up jack on the lift-up support plate and raise the high-strength reinforced concrete precast plate In the countermeasure method ,
After embedding the lift-up support plate, together with the laying polyethylene sheet for preventing grout leakage in the lift-up the support plate as well as on the roadbed engineering, on a polyethylene sheet is laid on the lift-up the support plate on The non-woven fabric sheet is attached, and the lift-up jack mounting jig is configured such that the upper surface plate and the lower surface plate are formed in a square shape, and the opposing side plates are formed in a rectangular shape having a predetermined length, A lift-up jack mounting portion for inserting the lift-up jack from the bottom is formed, and the lower portion is composed of a shaft portion that is vertically fixed to the lower portion of the lower surface plate, and a trapezoidal screw that is screwed to the pipe on the lower outer diameter of the shaft portion A rod hole that penetrates the rod that transmits the extension force of the lift-up jack to the roadbed is formed in the lower plate and the central portion of the shaft portion , and the lift is formed on the upper portion of the rod. up Settlement Measures method of high strength reinforced concrete precast plate characterized by comprising providing a jack receiving for installing Yakki.

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