JPH0721601Y2 - Pavement structure at joints such as roads - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pavement structure for a bridge portion such as a road bridge, an elevated road, an elevated parking lot, and a joint portion such as a joint for cement concrete pavement. For more details,
The present invention relates to a pavement structure for a joint portion such as a road where a special bituminous pavement is provided above the joint portion to form a bituminous pavement continuous with the asphalt pavement before and after the joint portion.

In road bridges, elevated roads, elevated parking lots, etc., expansion joints, that is, joints, are provided in floor slabs and the like for expanding and contracting structures. Therefore, even if the pavement is laid on the floor slab, the joints remain exposed, and these joints shock the vehicle traveling on the bridge surface.
It is a bottleneck for smooth running of the vehicle. This is not only unpleasant for the driver, but also shortens the life of the joint itself as well as the vehicle and contributes to noise. Especially, in snowy and cold regions, those are more prominent due to spike tires and tire chains. Therefore, it has been attempted to continuously overlay the asphalt pavement on the conventional pavement surface and the joint portion. However, stress is concentrated on the joint portion and the asphalt pavement around the joint portion due to expansion and contraction of the joint portion, difference in the material of the base, step difference, discontinuity, etc., so that the damage is quick and not practically sufficient.

Therefore, there is a demand for a durable pavement structure that eliminates vibration and noise due to traffic in the bridge joint.

Also in cement concrete pavement, the same phenomenon is observed in joints, especially in expanded joints. for that reason,
Although the asphalt pavement is overlaid, reflection cracks occur in the asphalt pavement on the joints and the durability of the pavement is impaired. It has been attempted to prevent reflection cracks by laying a reflection crack prevention material on the joints of cement concrete pavement and performing asphalt pavement, but it is not sufficient.

The present invention, as described above, improves the problems of pavement of bridge surface joints such as road bridges and joints of cement concrete pavement, and eliminates the occurrence of vibration and noise, Moreover, the present invention provides a pavement structure for a joint portion such as a road having excellent durability.

The present invention is a pavement structure for a joint portion of a road such as a bridge surface joint portion of a road, a cement concrete pavement joint portion, etc., so that the joint portion is covered on and around the joint portion over the width of the road. A thin elastic type bituminous joint material layer that is wider than the joint gap width is bonded to the joint, and a heating mixture of aggregate, filler, etc. and a binder made of elastic type bituminous joint material is bonded on the elastic type bituminous joint material layer. A pavement with a required thickness consisting of a pavement made of a heated asphalt mixture for pavement with a required thickness is connected before and after the pavement, and a continuous bituminous pavement is formed. The main point is the pavement structure at the joint.

In the present invention, the joint portion of a road or the like means a joint portion of a bridge surface such as a road bridge, an elevated road or an elevated parking lot, or a joint portion of cement concrete pavement such as a road or runway.

Next, an embodiment of the pavement structure at the joint portion of the road according to the present invention will be described with reference to the drawings. FIG. 1, FIG. 2 and FIG. 3 are sectional views showing the outline of one embodiment of the pavement structure of the bridge surface joint portion of a road bridge or the like. 1 and 2 show an example in which the existing pavement surface and the surface of the existing joint are at the same level, and FIG. 3 is an example when the floor slab surface and the surface of the bridge surface joint are at the same level. In the figure, (1) is a floor slab, such as a concrete floor slab, a PC floor slab (precast concrete floor slab), or a steel floor slab. (2) is a plate of a finger joint member, and (2 ') is a rubber joint member. (3) is an existing pavement, either asphalt pavement or cement concrete pavement. (4) is a resin mortar. (5) is an elastic type bituminous joint material layer, wider than the joint gap width of the road,
The joints and their surroundings (existing pavement surfaces, floor slabs, etc.) are joined so as to cover the width of the road. (6) is a pavement made of an elastic type bituminous mixture and having a required thickness (hereinafter referred to as an elastic type bituminous mixture pavement), which is bonded to the elastic type bituminous joint material layer (5). (7)
Is a side surface of the elastic type bituminous mixture pavement (6).
(8) is a pavement of the required thickness paved with a heated asphalt mixture for paving, which is paved on the existing pavement (Figs. 1 and 2) or on the floor slab (Fig. 3), and is an elastic type bitumen. It is connected to the mixture pavement (6) at its sides (7). Also on this side surface (7), an elastic type bituminous joint material layer (of the same material as the elastic type bituminous joint material layer (5))
Alternatively, the hot asphalt mixture pavement for pavement (8) can be pave-bonded therethrough.

The elastic type bituminous joint material layer used for the elastic type bituminous joint material layer (5) in the above is as follows.

The elastic type bituminous joint material is a thermoplastic joint material in which rubber, high-molecular polymer, etc. are mixed with the bituminous material, and the quality of the heat-injection type joint material described in "Cement Concrete Pavement Guidelines" issued by the Japan Road Association. It passes the standard. There are low-elasticity type and high-elasticity type in the heat-injection type joint material, but the high-elasticity type is usually used as the elastic type bituminous joint material. Further, depending on the place of use, a material having an intermediate property between the low elasticity type and the high elasticity type can be used. In addition, elastic type bituminous joint materials include those that pass the US Federal Standard SS-S-1401B "Heat injection type sealant for concrete pavement and asphalt pavement". Elastic type bituminous joint material has elasticity at room temperature,
It does not easily flow into high temperatures in summer, does not easily become brittle even in low temperatures in winter, is strong against impact, and has excellent bondability and extensibility. Further, the elastic type bituminous joint material is a heat-injection type joint material, but it can be formed into a sheet shape (for example, a thickness of about 1 to 10 mm) and used.

Elastic-type bituminous mixture The elastic-type bituminous mixture of the pavement (6) is as follows. The elastic type bituminous mixture is a heating mixture composed of an aggregate, a filler and a binder, and a heating mixture using the elastic type bituminous joint material having the same material as the elastic type bituminous joint material layer (5) as a binder. Is. The binder has a softening point of 75-12.
It has a viscosity of about 0 ° C even when it is heated and melted. The maximum particle size of the aggregate is 20 mm or less. The heated mixture is made by heating and mixing heated aggregate (crushed stone, sand, etc.), filler and binder, and is in the form of goose asphalt, but the amount of binder is much larger. 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, stone powder, slaked lime, and various fillers can be used. The mixing temperature of the heated mixture is higher than that of the heated asphalt mixture for paving. A pavement can be formed by pouring the heated mixture to the required thickness, leveling and cooling. An example of the composition of the elastic type bituminous mixture is 65% by weight of aggregate (crushed stone, no, etc.), 10% by weight of filler (stone powder, slaked lime, etc.), and 25% by weight of binder. A large amount of binder is used,
The pavement is highly watertight.

An elastic mesh bituminous mixture pavement (6) may be provided with a mesh-like mesh or a reinforcing member having a honeycomb structure when the pavement is formed. These restrain the expansion and contraction of the pavement, but are effective in preventing flow and reinforcement.

FIG. 4 is a sectional view showing the outline of one embodiment of the pavement structure of the joint portion of cement concrete pavement. In the figure, (9) is cement concrete pavement, (10) is its expansion joint, (11) is joint plate, and (12) is injection joint material. A joint plate (11) is inserted in the lower part of the expansion joint (10), and an injection joint material (12) is injected and filled in the upper part thereof. (5) is an elastic type bituminous joint material layer, (6) is an elastic type bituminous mixture pavement with a required thickness, and (8) is a heated asphalt mixture pavement with a required thickness, which is an elastic type bituminous mixture pavement (6 ) And its side (7). An elastic type bituminous joint material layer (of the same material as the elastic type bituminous joint material layer (5)) is bonded to this side surface (7), and a hot asphalt mixture pavement for paving is bonded through it. You can Next, one example of construction of the pavement structure of the joint portion of the road etc. of the present invention will be described with reference to FIG. The required thickness (for example, 4 mm) for the bridge surface joint and its surroundings (the plate (2) of the finger joint in Fig. 1 and the existing pavement surface around it)
An elastic type bituminous joint material layer (5) having a required thickness (width wider than the gap width of the joint) is adhered over a width such as a road to form an elastic type bituminous joint material layer (5). Usually, a primer is applied to the substrate and dried before adhesion.
Further, the elastic type bituminous joint material sheet is provided with a release paper, and by taking it out, it can be easily adhered by utilizing the pressure-sensitive adhesive property of the surface. Alternatively, an elastic type bituminous joint material layer (5) is prepared by applying a heat-melted elastic type bituminous joint material.
To form. Forming molds on both sides for constructing the elastic type bituminous mixture pavement (6) on this elastic type bituminous joint material layer (5), and pouring the heated mixture of the elastic type bituminous mixture into the formwork, Fill and straighten to form elastic type bituminous mix pavement (6) of required thickness. Remove the formwork,
The surface of the elastic type bituminous mixture pavement (6) is sprinkled with stone powder or the like, and if necessary plywood or the like is placed on the surface of the elastic type bituminous mixture pavement (6). A mixture (for example, asphalt concrete) is laid and rolled to form a hot asphalt mixture pavement (8) for pavement, and plywood is removed to form a bituminous pavement. Thus, the pavement structure of the present invention is completed. In the above, the elastic type bituminous mixture pavement (6) may be molded in advance to a required thickness, width and length in a factory or the like and used. When a molded body is used, the elastic type bituminous joint material layer (5) may be formed into a sheet, but a method in which a heat-melted material is flow-coated and bonded is also used. It is also possible to use burner heating for bonding. Further, the elastic type bituminous mixture pavement (6) and the hot asphalt mixture pavement (8) for pavement are generally bonded directly, but they are bonded via an elastic type bituminous joint material layer. be able to. In that case, a strip-shaped sheet of elastic type bituminous joint material (thickness 4 to 10 mm) of pavement thickness and width is pasted on the side surface (7) of the elastic type bituminous mixture pavement, and then heating for paving. Pave the asphalt mixture.

When the pavement structure of the present invention is to be constructed, such as when there is already asphalt pavement on the bridge joint part of a road bridge or when there is an overlay of asphalt pavement on cement concrete pavement, the joint part and its The surrounding asphalt pavement may be removed by cutting, and then the method described above may be applied. In this case, the elastic type bituminous joint material sheet may be adhered to the cut surface of the asphalt pavement.

The pavement structure of the joint part of the road etc. of the present invention has the elastic type bituminous joint material layer which is bonded to cover the joint part as above, and the elastic type bituminous mixture pavement is formed on it, and before and after that. The heated asphalt mixture pavement for pavement is bonded to the pavement to form a bituminous pavement with a uniform surface as a whole.

Therefore, it has sufficient flatness for the traffic of the vehicle, can run smoothly, and does not generate vibration or noise due to impact. The pavement on the joint where stress is concentrated is made of an elastic type bituminous mixture that is water-tight with a large amount of binder, and it does not flow at high temperatures in summer. . The expansion and contraction of the joint portion is absorbed and relaxed by the elastic type bituminous joint material layer (5) and further absorbed by a slight deformation of the elastic type bituminous mixture pavement (6). The elastic type bituminous mixture pavement (6) does not crack, is watertight and has good bonding properties with the hot asphalt mixture pavement (8) for paving. Therefore, the pavement is very durable. In addition, rainwater does not seep through the joint and go around. It has excellent practical benefits.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIGS. 1, 2 and 3 are sectional views showing an outline of an embodiment of a pavement structure of a bridge surface joint portion of a road bridge, etc. FIG. 1 is a sectional view showing an outline of an example of a pavement structure of a joint portion of cement concrete pavement. In the figure, (1) is the floor slab,
(2) is a plate of the finger joint member,
(2 ') is a rubber joint member, (3) is existing pavement,
(4) is a resin mortar, (5) is an elastic type bituminous joint material layer, (6) is an elastic type bituminous mixture pavement, (7) is a side surface of the elastic type bituminous mixture pavement, and (8) is a heated asphalt for pavement. Mixture pavement, (9) cement concrete pavement, (10) expansion joint, (11) joint board, and (12) injection joint material.

Claims (1)

[Scope of utility model registration request] 1. A pavement structure for a joint portion of a road, such as a bridge surface joint portion of a road, a cement concrete pavement joint portion, etc., so that the joint portion is covered over the width of the joint portion and its surroundings. A thin elastic type bituminous joint material layer wider than the joint gap width is bonded to the joint, and heating of the elastic type bituminous joint material layer is performed on the elastic type bituminous joint material layer with a binder made of elastic type bituminous joint material. A pavement of a required thickness made of a mixture is bonded, and a pavement made of a hot asphalt mixture for a pavement of a required thickness is bonded before and after the pavement to form a continuous bituminous pavement. The pavement structure at joints such as roads.