JPH086805Y2 - Pavement structure around the bridge joint - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pavement structure around a bridge surface joint portion such as a road bridge, an elevated road, and an elevated parking lot. More specifically, a special bituminous pavement made of a heated mixture containing an elastic type bituminous joint material as a binder is provided flush with the upper surface of the joint part on the upper part (for example, the surface layer) of the pavement following these joint parts, and subsequently. The present invention relates to a pavement structure around a bridge joint where an asphalt pavement is provided.

In road bridges, elevated roads, elevated parking lots, etc., expansion joints are provided on floor slabs and the like to accommodate expansion and contraction of structures.
Therefore, even if pavement is laid on the floor slab, the joint portion gives a shock to the vehicle traveling on the bridge surface, which is a bottleneck for the vehicle to smoothly travel. This is not only unpleasant for the driver, but also shortens the life of the joint itself and contributes to noise not only from the vehicle side. Especially in the snowy regions, spike tires,
They are more prominent with the tire chains. Further, in the asphalt pavement around the joint portion, stress is concentrated due to the difference in material of the joint portion and the asphalt pavement, steps, discontinuity, etc., so that the damage is quick and not practically sufficient.

The present invention is intended to improve the above-mentioned drawbacks.A special bituminous pavement made of a heating mixture containing an elastic type bituminous joint material as a binder on the surface of the asphalt pavement following the bridge joint is flush with the upper surface of the joint. The present invention provides a pavement structure around the bridge face joint portion which is excellent in durability while preventing damage to the pavement, reducing noise such as vibration and impact.

And this invention arrange | positions the joint part on a floor slab so that the space | gap between floor slabs may be covered, and after this joint part, aggregate with a predetermined width,
An elastic type bituminous pavement made of a heated mixture consisting of a filler and a binder made of an elastic type bituminous joint material was paved flush with the upper surface of the joint, and an asphalt pavement was continuously formed on the elastic type bituminous pavement. The gist is the pavement structure around the bridge joint.

The bridge surface joint portion in the present invention means a joint portion of a bridge surface such as a road bridge, an elevated road, an elevated parking lot and the like.

Next, the pavement structure around the bridge joint of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing the outline of one embodiment of a pavement structure around a bridge joint of the present invention. In the figure, (1) is a floor slab, (2) is a bridge surface joint part, and the floor slab (1) (1)
It is fixed on the floor slabs (1) (1) facing each other so as to cover the gap between them. (3) and (4) are asphalt pavements, (3) is the lower layer, and (4) is the upper layer.
(5) is an elastic type bituminous pavement which is a heating mixture composed of an aggregate, a filler and a binder made of an elastic type bituminous joint material, and is adjacent to the bridge face joint part (2) and is a bridge face joint part. Is flush with the upper surface of the. (6) is an elastic type bituminous joint material layer, and (7) is a leveling layer.

The elastic type bituminous joint material used in the present invention is as follows.

A thermoplastic material that is a mixture of bitumen with rubber and high molecular weight polymer, and has physical properties equivalent to a heat-injection type joint filler,
The softening point (ring and ball method) is 80 to 120 ° C, and the flow is 5 mm or less by the flow test (at 60 ° C) of the test items of the quality standard of the heat-injection type joint material of cement concrete pavement issued by the Japan Road Association. A tensile strength test (at -10 ° C) for checking the bondability and elongation in winter has a tensile strength of 3 mm or more. There are a low elasticity type and a high elasticity type in the quality standard of the above-mentioned heat-operated injection joint material, and both can be used. In addition, for this quality standard, even if there are items that are based on individual standards, the softening point,
Those that pass the numerical values of flow rate and tensile amount can be used. Even if it is not commercialized as a joint material or joint material of quality standards other than the above (for example, US Federal Standards, ASTM standards, etc.), all those that pass the numerical values of the above softening point, flow and tensile amount Can be used.

The elastic type bituminous joint material used in the present invention is as described above, but it has elasticity at room temperature, does not easily flow to high temperatures in summer, and does not easily become brittle at low temperatures in winter.
In addition, it is strong against impact and has excellent bondability and extensibility. It is heated and melted to form a binder for the heated mixture described below, but even when melted, it has a very high viscosity as compared with asphalt for paving.

The heating mixture comprising the above-mentioned elastic type bituminous joint material, which constitutes the elastic type bituminous pavement (5), as the binding material, the aggregate, the filler and the binding material is as follows.

The maximum particle size of the aggregate is 20 mm or less, and it is made by heating and mixing the aggregate (such as stone sand) and the binder.

As the aggregate, in addition to the aggregate used for a usual hot asphalt mixture for paving (for example, asphalt concrete, goose asphalt, etc.), a special aggregate such as a hard aggregate such as emery can be used. As for the filler, various fillers other than stone powder, slaked lime, etc. can be used. A so-called asphalt heat-coated aggregate obtained by adding a small amount of asphalt, which is usually used in asphalt pavement, asphalt with rubber, etc., to the heated aggregate and mixing and coating (about 1-2% by weight of the aggregate weight Can also be used.

Such an aggregate precoat plays the role of a primer for the aggregate, accelerates the wetting of the high-viscosity binder, and improves the bondability.

The hot mix formulation is a dense formulation with no porosity.
The amount of binder to aggregate is much higher than the various hot asphalt mixtures used for paving, and is higher than that of goose asphalt. For example, in the case of multi-granular aggregate, 65% by weight of aggregate (acne, sand, etc.), filler (stone powder,
10% by weight of slaked lime, etc., and 25% by weight of binder. In the case of Macadam aggregate, for example, 75% by weight of aggregate (No. 5 agate stone), 7% by weight of filler (stone powder, slaked lime, etc.), and 18% by weight of binder.

The hot mix temperature of the hot mix is higher than that of the hot paving asphalt mix. The heating temperature of the aggregate is 180 ° C or higher. When producing a heated mixture, it is appropriate to add the binder in small pieces, small particles, lumps, or other suitable shapes to a mixer containing heated aggregate and mixing them. . It is less time-consuming and labor-intensive than heat-melting the binder in advance with a kettle and adding it to the heated aggregate, filler, etc. and mixing, and can prevent thermal deterioration of the binder.

The elastic type bituminous pavement (5) can be formed by spreading and compacting the above-mentioned heated mixture. It is possible to sprinkle emery chips etc. while the surface is hot to give the surface a non-slip finish. It is also possible to flow the heated mixture into a mold of a predetermined size in a factory or the like and spread it, oscillate and compact it to form a molded product, which is then used for the elastic type bituminous pavement (5). it can. Furthermore, when the elastic type bituminous pavement (5) is applied, it is also possible to lay a bituminous rope-like cloth, mesh, non-woven fabric (including perforated), woven cloth, etc. as a base, and also to perform molding. It is also possible to attach a bituminous rope-like cloth, mesh, non-woven fabric, (including perforated), woven cloth or the like to the lower surface of the. In this way, the elastic type bituminous pavement (5) can be reinforced.

Compared to the heated asphalt mixture used for asphalt pavement, the heated mixture has a much larger amount of binder relative to the amount of aggregate, but due to the excellent properties of the binder, it has comparable flow resistance, flexibility and wear resistance. It has excellent physical properties and impact resistance.

Elastic type bituminous pavement (5) has a thickness of 2-3 cm and a width of 50
~ 60cm is the standard.

The leveling layer (7) serves as a bonding layer for the elastic type bituminous pavement (5) in addition to the leveling of the base, but the heating mixture constituting the elastic type bituminous pavement (5) is used as a base (for example, asphalt). This can be omitted when directly laying down the pavement underlayment (3) and laying it down. Various kinds of leveling layers (7) can be used. For example, a heated mixture containing acrylic resin (reactive type), bituminous material, elastic type bituminous joint material and the like as a binder is used.

The pavement structure around the bridge surface joint portion of the present invention is usually applied to repair asphalt pavement around the bridge surface joint portion, but is also suitable for new construction. The construction method will be explained by taking the case of repair as an example.

After cutting and removing the aged upper layer of the asphalt pavement on the bridge surface, when asphalt pavement is applied to that part,
Elastic type bituminous pavement (5) and elastic type bituminous joint material layer (6) and leveling layer (7) are installed with a formwork to lay the asphalt pavement upper layer (4), and then the formwork is removed. The base is cleaned and the leveling layer (7) is used to mold the elastic bituminous pavement (5) while leveling it between the bridge face joint (1) and the asphalt pavement upper layer (4). Install so that it becomes one. Then, after the leveling layer (7) is solidified, the elastic type bituminous pavement (5) is poured into the gap between the upper layer (4) of the asphalt pavement and the joint part (2) and the melted elastic type bituminous joint material is filled. Elastic type bituminous joint material layer (6) is formed,
The elastic type bituminous pavement (5), the asphalt pavement upper layer (4) and the joint portion (2) are water-tightly bonded.

In the above, when the elastic type bituminous pavement (5) is spread by spreading the heated mixture instead of the molding, the end side surface of the upper layer (4) of the asphalt pavement and the end side surface of the joint part (2) Elastic type bituminous joint material layer (6)
(Plate-shaped) is stuck and the heated mixture is poured into and compacted by vibrating compaction without providing the leveling layer (7), and the joint part (2) and the upper surface of the asphalt pavement upper layer (4) Arrange to be flush. in this case,
It may be poured more than once. In this case, the elastic type bituminous joint material layer (6) may be omitted.

When replacing only the upper layer around the joint part of the asphalt pavement on the bridge surface with the elastic type bituminous pavement (5), the elastic type bituminous pavement (5), elastic type bituminous joint material layer (6), and leveling layer in the figure (7) The asphalt pavement at the portion where the part is to be constructed is heated and excavated on the road surface, and then the elastic type bituminous pavement (5) is paved with the molded product or the heated mixture according to the above. The pavement structure around the bridge joint of the present invention can be constructed as described above.

An example of the physical properties of a heated mixture (hereinafter referred to as gum macadam goose) that constitutes the elastic type bituminous pavement (8) used in the present invention, and a dense particle size ascon gap (20) for comparison.
F) and shows the physical properties of goose asphalt. Each mixture used in the experiment is as follows.

Macadam goose: Crushed stone No. 5 (20-13mm) asphalt heat-coated aggregate 75
% By weight, 7% by weight of fillers (stone powder, slaked lime), and 18% by weight of a binder are heated and mixed (temperature of about 230 to 2
50 ° C).

Fine particle size ascon gap (20F): Aggregate particle size Particle size (mm) 25 20 13 10 5 Percentage passing weight (%) 100 97.4 57.7 41.3 30.1 Particle size (mm) 2.5 0.6 0.3 0.15 0.074 Percent passing weight (%) 28.9 20.8 12.4 9.0 6.0 Asphalt amount (straight asphalt) 6.0 wt% hot asphalt mixture (Temperature approx. 150-160 ℃) Goose asphalt: No. 6 crushed stone (13-5 mm) 22 wt%, No. 7 crushed stone (5-2.5 m)
m) 22% by weight, sand 20% by weight, stone powder 27.7% by weight, and asphalt (straight asphalt, rake asphalt) 8.3% by weight goose asphalt (temperature about 220-24.
(0 ℃) Experimental Example 1 Gum Macadam Goose and goose asphalt were poured into a formwork, laid out, vibration-compressed and rectified to 40 × 40.
A test piece having a size of 300 mm was prepared and subjected to a bending test and a repeated bending test. The results are shown in Tables 1 and 2.

Experimental Example 2 Assemble the fine-grained ascon gap (20F) in a formwork and compact it with a roller compactor to make a 15 × 40 × 5 cm specimen and a 30 × 30 × 5 cm specimen. For gum mackerel goose and goose asphalt, pour into a formwork and oscillate and compact to make test pieces of 15 × 30 × 5 cm and 30 × 30 × 5 cm, respectively. The 15 × 30 × 5 cm specimen was subjected to the spike labeling test (−10 ° C.), and the 30 × 30 cm × 5 cm specimen was subjected to the wheel tracking test (60 ° C.). The test method is based on the asphalt pavement guidelines issued by the Japan Road Association.
In the labeling test, spiked tires were attached instead of the wheels with chains. The test results are shown in Table-3 and Table-4.

From the above experimental results, elastic type bituminous pavement (5)
However, it is clear that it is superior in stretchability and cyclic bendability as compared to asphalt pavement, and is also superior in wear resistance and fluidity resistance.

The pavement structure around the bridge surface joint portion of the present invention uses an elastic type bituminous pavement to remove the asphalt pavement portion of the bridge surface joint portion that is most likely to be damaged by stress such as vibration and shock concentrated under traffic around the joint portion. The structure is flush with the top surface. The elastic type bituminous pavement has elasticity, elasticity, and excellent repeatability, and absorbs and relaxes stress.
Withstands vibration and shock under traffic. It also has excellent flow resistance and wear resistance, and can form durable pavements. Therefore, it has excellent practical benefits such as great noise prevention effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention and showing an outline of an embodiment of a pavement structure around a bridge joint such as a road bridge. In the figure, (1) is the floor slab, (2) is the bridge joint, (3)
Is an asphalt pavement lower layer, (4) is an asphalt pavement upper layer, (5) is an elastic type bituminous pavement body, (6) is an elastic type bituminous joint material layer, and (7) is a leveling layer.

Claims (1)

[Scope of utility model registration request] 1. A joint portion is arranged on the floor slab so as to cover a gap between the floor slabs, and rubber is used as a bituminous material for the aggregate and the filler at the peripheral portion in the longitudinal direction of the road continuing to the joint portion. And an elastic type bituminous pavement consisting of a heated mixture obtained by adding and mixing an elastic type bituminous jointing material having a thermoplasticity with a high molecular weight polymer mixed as a binder, and paving the joint surface with the upper surface,
A pavement structure around the bridge face joint, which is characterized by paving an asphalt pavement in succession to the elastic type bituminous pavement.