JPH09302758A - Precast concrete closed gutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quicken water drainage from road surface and enhance the safety and availability of the top surface of the gutter by separating the top surface of a closed gutter to the right and left leaving small beams in a cross section which is easily cracked and corrosion-proof negative and positive main reinforcing bars are placed, thereby forming a storm water inlet in a continuous state. SOLUTION: A lid slab 1 is set in a U-shaped gutter 20 and a closed gutter 22 is formed. Then, the lid slab 1 is separated to the right and left leaving a small beam 4 thereby providing a rain water inlet 5. Then, the small beam 4 is positioned below the top surface of the lid slab 1, and a V-shaped cut 9 with a reduced section is provided. Next, main reinforcing bars are placed near the upper and lower edge of the reduced cross section. Then, by the occurrence of cracking in the concrete of reduced cross section, the positive and negative corrosion-proof main steel bars act as an elastic fixed beam. Also, only the small beam portion 4 is made to a V-shaped cut 10 with the upper side opened for the removal of concrete formwork. And the inlet 5 is continued throughout the whole length of the gutter. By doing this, an elastic lid slab 1 generating less noise and rattle can be formed and the fixed top surface can be stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of a gutter which becomes a part of the road width by using precast concrete. The drainage of rainwater from the road surface is fast and the safety and utilization of the upper surface of the gutter is enhanced, and rattling noise caused by running of a vehicle or the like. The present invention relates to easily and inexpensively obtaining a underdrain gutter that suppresses the above.

[0002]

2. Description of the Related Art Conventionally, in an underdrain side structure in which a U-shaped groove is covered with a lid or an inverted U-shaped groove is placed on a bottom portion of a completed construction, a lid plate or an upper plate is separated into right and left, and a plurality of elastic fixing beams A narrow rainwater inlet is provided by connecting with. (For example, Japanese Patent Application No. 7-
See 150797 and JP-A-7-166598. )

[0003]

In the conventional underdrain gutter, when a continuous rainwater inlet is provided in the upper part, it is made of precast concrete in which a plurality of elastic fixing beams are anchor-embedded in the left and right connections. In this case, since fixed beam members such as shaped steel are used separately from normal concrete molding materials, the material cost is high, and the work of mounting the fixed beam members in the formwork is also necessary in the production process. Since it becomes necessary to adapt to continuous production in a line, there is a problem that the cost is further increased. In addition, it is difficult to apply it to an immediate demolding method in which dry concrete is used to vibrate and pressurize because concrete is poured into the fixed beam member.

[0004]

According to the present invention, a beam is integrally molded with a double reinforced concrete of the same material as the left and right bodies, and the entire structure including the positive and negative rebars passing through the beam to the left and right is formed. A reinforcing frame is arranged to assemble a form, and for example, a slump of about 3 to 8 cm is poured into the concrete, and then the mold is removed after a curing process, or slump 0 hard-mixed concrete is forcibly placed. It can be manufactured by any of the methods of immediately removing from the mold. The amount of positive and negative double rebars in the beam and the distance between the rebars shall be sufficient to maintain the required strength for the design load assuming an exposed state without concrete. Even before the design load is 100% loaded, fine cracks are induced to make the whole structure slightly flexible due to the elasticity of only the positive and negative double rebars.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, in an underditch side groove which is constructed by covering a U-shaped groove with a lid or mounting an inverted U-shaped groove on a bottom portion which is constructed in advance, the upper surface is fully extended with a small continuous state. By forming a rainwater inlet, leaving only a plurality of composite reinforced concrete beamlets left and right substantially isolated from each other and making it an integral structure, and by inducing minute cracks in the reduced cross section of the beam itself, only the positive and negative main rebars are It works as a single steel beam, and the upper plate has a slightly elastic flexible structure.

The positive and negative main rebars passing through the beam through the left and right bodies are made of corrosion-resistant steel bars such as zinc plating, and are part of the whole body which is spot-welded as reinforcing rebars.

[0007] In the manufacturing process of arranging the reinforced reinforcing bar net knitted in the formwork, the main reinforcing bars in the beam are precise as long as the distance between the positive and negative bars is held by spot welding and stored in the beam cross section. No fixing by positioning is required.

Therefore, the concrete to be placed in the next step is suitable for both concrete and non-fluid concrete. That is, the latter dry concrete does not hinder the fixing of the positive and negative main rebar positions of the beam portion, though it is forcedly placed by vibration and pressure.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described in more detail below.

1 and 2 show construction cross sections of an embodiment of an underditch side groove. FIG. 1 shows an underditch side groove (22) in which the lid plate (1) is set in the U-shaped groove (20), and the lid plate (1) is a beam (4).
It is isolated on the left and right, and a rainwater inlet (5) is formed. The beam (4) is located below the upper surface of the lid plate, and has a V-shaped cut (9) for reducing the cross section on the lower surface. Figure 2 shows the underdrain gutter (22) in which the inverted U-shaped gutter (2) is placed on the bottom part (21) of the previous construction, and the upper plate (6) is left and right isolated with the beam (4) left. The entrance (5) is formed, the beam (4) is installed at a position inside the rainwater inlet slightly lower than the upper surface, and the lower surface has a V-shaped cut (9).

As shown in FIG. 3, the lid slab (1) has a rainwater inlet (5) slightly opened downward so that the formwork can be easily removed during manufacturing, and at the same time, clogging of small gravel after use is prevented. In addition, only the beam portion is reversely made into a V-shaped cut (10) with an upper opening for manufacturing form removal, and the rainwater inlet (5) is made continuous over the entire length.
Also, with the corresponding V-shaped cuts (9) on the lower surface, FIG.
As shown in FIG. 5, a reduced cross section (11) of the beam (4) is formed. In addition, FIG. 4 shows a two-unit lid plate (1), (1).
Is a reduced cross-section portion (16) with a slight constant interval (13) kept between them, and penetrates the anticorrosion reinforcing bar (14) to form one large lid plate (3).

As shown in FIG. 5, the inverted U-shaped groove (2) is provided with a slightly downward opening rainwater inlet (5) on the upper plate (6), and an upward opening V-shape only for the beam (4). It is formed in a continuous state through the cut (10). Also, the corresponding V-shaped cut (9) on the lower surface reduces the cross section (11) of the beam (4).
Is formed. 6 shows an embodiment of an inverted U-shaped groove (2) in which a lid receiving opening (7) is provided in a part of the upper plate (6),
Usually, it is used at intervals of, for example, 10 to 20 cm of extension of the underditch side gutter, and is used as a grating lid for maintenance.

As shown in the embodiment of FIGS. 7 and 8, positive and negative anticorrosion main reinforcing bars (8) are arranged on the beam (4) near the upper and lower edges of the reduced cross section. Then, as shown in FIG. 8, both the lid slab (1) and the inverted U-shaped groove (2) generate fine cracks (12) of concrete on the reduced cross-section (11) of the beam (4), so that positive and negative corrosion protection The rebar acts directly as an elastic fixed beam.

[0014]

The present invention is carried out in the form described above, and has the following effects.

After cracks are induced in the reduced cross section of the beam, the concrete part holds the positions of the rebars relative to each other, and the main positive and negative rebars in the beam function the same as one steel fixed beam. Therefore, in the cover plate hanging underditch side groove, it becomes a flexible cover plate which is less likely to cause rattling noise.
2m of flexible structure within the range where it can be hung by connecting the lid plate of the unit or more through the reinforcing bar and connecting it with the reduced cross section (16),
In the case of a large lid plate having a length of 4 m or the like, rattling noise can be suppressed and a stable structure can be obtained by a uniform crimping state that is easy to fit even in the longitudinal direction of the side groove.
In addition, even in the underditch gutter that is placed on the constructed bottom, the reverse U
Due to the flexibility of the letter groove upper plate, it receives the backfilling side pressure and fits well with the bottom part, and the fixed upper surface becomes a stable structure.

Further, a narrow rainwater inlet is formed continuously on the upper surface to form a culvert side groove, and the road surface drainage is evenly distributed along the road extension, so that the road function is not hindered.

Also in production, the beam is made of reinforced concrete made of the same material as the left and right main bodies, it is easy to place the compound rebar in the beam, no precise positioning is required, and a simple lid plate without a rainwater inlet and an inverted U-shaped groove It is the same work process as in the above case, is suitable for continuous line production, and concrete can be either fluidized concrete or hard-mixed concrete, and can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an underditch side groove that is covered with a U-shaped groove.

FIG. 2 is a cross-sectional view showing an embodiment of an underditch side groove in which an inverted U-shaped groove is placed on a bottom portion which is previously constructed.

FIG. 3 is a cutaway perspective view showing an embodiment of a lid plate.

FIG. 4 is a cutaway oblique view showing an embodiment of a large lid plate in which two lid plate units are integrally connected at a reduced cross section.

FIG. 5 is a cutaway oblique view showing an embodiment of an inverted U-shaped groove.

FIG. 6 is a cutaway oblique view showing an embodiment of an inverted U-shaped groove in which a lid receiving opening is provided in a part of an upper plate.

7 is a sectional view taken along line aa of FIG.

FIG. 8 is a partially enlarged view showing a state where a minute crack is generated in a reduced cross-section portion of a beam.

[Explanation of symbols]

 1 lid slab 2 inverted U-shaped groove 3 large lid slab 4 beam girder 5 rainwater inlet 6 upper slab 7 opening 8 main rebar 9, 10 V-shaped cut 11, 16 reduced cross-section 12, 15 cracks 13 spacing 14 reinforced rebar 20 U-shaped groove 21 Bottom 22 Underditch side groove

Claims (5)

[Claims] 1. A cover slab (1) or an upper slab in which a cover slab (1) is hung on a U-shaped groove (20) or an inverted U-shaped groove (2) is placed on a constructed bottom (21). A narrow continuous rainwater inlet (5) is formed in the plate (6), leaving a plurality of composite reinforced concrete beam (4) parts and left and right substantially separated to form an integrated structure. Precast concrete underditch gutters (22) in which fine cracks (12) are cast on the concrete within the span so that the beam itself functions only with positive and negative corrosion-resistant main rebars (8). 2. A rainwater inlet (5) having a small width and continuous in a direction perpendicular to the span is formed, and a plurality of composite reinforced concrete beam (4) portions are left and left to be substantially separated from each other into an integral structure, and the span is formed. Main anti-corrosion bars (8) with positive and negative span length penetrating through each beam (4) with a small section cut down to make concrete cracks (12) flow through concrete
A precast concrete lid plate (1) for underditch gutters in which is arranged. 3. The anticorrosion reinforcing bar (14) comprising two or a plurality of lid plate (1) units in a direction perpendicular to the span and having a reduced cross section (16) with a slight constant interval (13) kept between them.
A large precast concrete lid plate for underditch gutters (3) that has a flexible structure within the range in which fine cracks (15) are connected to the concrete with a reduced cross-section that penetrates through it so that it can be integrally lifted in the length direction. 4. A rainwater inlet (5) having a small width and continuous state is formed over the entire length of the upper plate (6), and a plurality of composite reinforced concrete beam (4) parts are left to form an integral structure while being substantially left and right isolated. And, the main anti-corrosion bars of the positive and negative parts of the span of the upper plate (6) are pierced through each beam (4) in which a small crack (12) is made to flow through the concrete by reducing the cross-section of a part of the span (6). Precast concrete inverted U-shaped groove (2) for underdrain where 8) is arranged. 5. A lid receiving opening (7) is provided in a part of the upper plate (6).
The precast concrete inverted U-shaped groove (2) for underdrain according to claim 4, which is provided with.