JPH02229307A - Sheet for overlay execution - Google Patents

Abstract

PURPOSE:To improve adhesion property of the upper and lower faces and physical characteristic by forming a belt-like sheet through mixing fine aggregate, sand particles, filler, and the like into flexible resin, and additionally providing hot melt type nonwoven fabric layers or the like on the upper and lower faces of the sheet. CONSTITUTION:A belt-like sheet 11 is formed by uniformly mixing fine aggregate, sand particles, filler, and the like into binding material made from flexible resin such as methyl meta-acrylate resin. Sequentially, on the upper and lower faces of the sheet 11, layers made of hot melt type nonwoven fabric or wire netting are additionally provided to form a windable sheet 10. Further, adhesion property against the base layer and the upper new pavement layer is strengthened. Hereby, physical characteristic with cushioning function can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an overlay construction sheet useful for repairing asphalt pavement paved on roads or floors of factories, warehouses, etc.

[Prior Art] The surface layer of a road needs to have the strength to directly support the traffic load and at the same time safely transmit that load to the roadbed and roadbed.In order to ensure safe operation of vehicles, the road surface layer must have peeling resistance, Appropriate frictional resistance and flexibility are required. Furthermore, it is important to prevent water from entering from the surface layer to prevent loosening of the underlying base layer, roadbed, and subgrade.

Therefore, the surfaces of roads, parking lots, and factory floors that are paved with asphalt, concrete, etc., often develop cracks, depressions, potholes, etc. due to traffic loads and changes over time. The original function of the system will be hindered, and repair work will be required. Surface repair generally involves removing the damaged upper surface of the pavement, leaving the base layer in place for the roadbed in the case of a simple paved road, or in the case of asphalt concrete pavement, or cement concrete pavement, etc., and applying resurfacing (overlay). That is preferable. [Problems to be Solved by the Invention] Conventionally, such overlay pavement has been carried out using a permeation method, a cold mixture method, or a superheated mixture method. If there are dents or cracks in the subgrade or base layer located below the resurfaced surface, there is a problem that cracks will occur again in the same position in the asphalt mixture on which overlay pavement has been applied (such cracks are called reflection cracks). ). Therefore, in order to suppress this reflection crack, it has been considered to lay repair sheets on the existing old pavement surface during overlay construction to alleviate the movement of the overlay construction repair surface to some extent. This kind of repair sheet has a problem in that it cannot fully perform its function because it does not have sufficient adhesion to the old pavement surface or to the new pavement surface after overlay construction. Means for Solving Problem E] The present invention has been made in view of such problems, and
As a flexible resin with excellent water resistance, weather resistance, impact resistance, etc., for example, methyl methacrylate resin (MMA)
is used as a binding material, fine aggregate, sand grains, filler, etc. are mixed into this binding material and formed into a belt-shaped sheet, and a layer of hot melt type non-woven fabric or wire mesh is placed on the top and bottom surfaces of this belt-shaped sheet. This is an attached sheet for overlay construction that can be rolled up. [Function] Since the overlay construction sheet of the present invention is formed into a band-shaped body, it can be carried out in a roll form from a manufacturing factory.
It can be transported to the overlay construction site and immediately used as a base sheet for new pavement surfaces. In addition, since the overlay construction sheet of the present invention has layers of hot-melt nonwoven fabric or wire mesh attached to the upper and lower surfaces, it is easy to bond the base layer or roadbed on which the overlay will be performed and the asphalt concrete layer that will become the new pavement surface. In addition to strengthening the properties, the sheet body functions as a buffer layer,
Since the stress of traffic loads is effectively dispersed, it is possible to prevent the occurrence of reflection cracks. [Example] Fig. 1 is a perspective view of a part of the overlay construction sheet 10 of the present invention in cross section. In this figure, l1 is, for example, methyl methacrylate resin (
MMA), mixed with fine aggregate, sand grains, filler stone powder, rubber powder, glass or carbon fiber, etc. as an extender, and further mixed with a small amount of calcium carbonate if necessary, and formed into a belt-shaped sheet body, 12 is a layer of hot melt type non-woven fabric (hereinafter referred to as
Also referred to as the lower surface layer), l3 is a layer of iron or stainless wire mesh (hereinafter referred to as the upper surface layer) formed on the upper surface of the sheet body 11. As described above, the overlay construction sheet of the present invention has three
It has a layered structure and is manufactured under controlled conditions at a factory. When overlay construction is to be carried out, this sheet material is cut into appropriate lengths, rolled, and transported to the construction site. As shown in Figure 2, valley construction generally involves the construction of a roadbed 21, which is the base of the road, and a base layer 22 above it.
This involves removing asphalt pavement layers whose surface functionality has deteriorated due to cracks, dents, or abrasion, and repairing the damaged old pavement layer with a new one. The overlay construction sheet 10 of the present invention is laid after cleaning the upper surface of the base layer 22 and, if necessary, spraying a tack coat thereon. After covering the repaired road portion with the overlay construction sheet 10 of the present invention, an asphalt pavement layer 23 mixed with coarse aggregate or fine aggregate is formed as in the conventional method. In the overlay construction sheet IO of the present invention, since a hot melt quib nonwoven fabric is attached to the lower layer l2, the adhesiveness with the base layer 22 is strengthened, and the roadbed
1 or the base layer 22 and the repair sheet member of the present invention can be effectively prevented from shifting. Furthermore, since a layer of wire mesh is provided on the upper surface layer l3 of the overlay construction sheet, when paving with asphalt concrete is constructed on this layer, the asphalt paving material will dig into the wire mesh forming the upper surface layer l3. It sticks to the surface and exerts an anchor effect to support the surface layer. In addition, the sheet body 11 is made of a flexible resin that is highly flexible and can completely prevent water ingress, so it protects the roadbed and roadbed from rainwater, etc., and disperses traffic loads to prevent reflection cracks. This increases the effectiveness of preventing damage and maintaining strength. Cracks 22A in base layer 22 for overlay
If a large number of cracks occur, it is recommended to repair them by applying pressure such as cement milk to the cracks. As this repair cement milk, it is possible to use a semi-rigid pavement bonding material that has been separately filed by the present applicant. In the above embodiment, a hot-melt type nonwoven fabric is attached to the lower layer 12, but the lower layer 12 can also be a wire mesh layer.

Further, instead of the wire mesh, a layer of hot melt type nonwoven fabric may be attached to the upper surface layer l3 of the sheet body 11. Hot melt type nonwoven fabrics are made of low melting point polyester,
It is a mesh adhesive based on thermoplastic resin such as nylon or EVA, and melts at 80°C to 100°C.
Cures at low temperature. Therefore, it chemically bonds to asphalt concrete pavement components, resulting in extremely strong adhesive strength. Since the present invention uses such a hot melt type non-woven fabric or wire mesh as a sheet member with a three-layer structure, it is possible to firmly connect the new pavement surface and the road infrastructure through the sheet member, and it is possible to firmly connect the new pavement surface to the road infrastructure. While maintaining the required flexibility and waterproofness, it also effectively transfers traffic loads to the lower part, ensuring safe and comfortable operation of the vehicle. [Effects of the Invention] As explained above, the overlay construction sheet of the present invention includes a belt-shaped sheet body made of flexible resin, and a hot-melt type nonwoven fabric, iron or By adding a layer of stainless steel wire mesh to create a three-layer sheet, the adhesion between the asphalt mixture applied to the new pavement and the road base layer is strengthened.
It has the effect of strengthening the physical properties of the surface layer. In addition, since the sheet body of the belt-shaped body is made of a flexible binding material mixed with fine aggregate, etc., it functions as a buffer layer, and the stress of traffic loads is dispersed and transmitted to the roadbed or base layer. , reflection cracks can be effectively suppressed. It is an explanatory view showing an application example of a sheet for lay construction.

In the figure, 11 is a sheet body made of a flexible binding material, 12,
l3 indicates the upper or lower layer made of hot melt type or wire mesh. ↓｝Ichino；゛． +-)

[Brief explanation of the drawing]

Claims (1)

[Claims] A flexible resin mixed with fine aggregate or filler as an extender is processed into a belt-shaped mat, and layers of hot melt type non-woven fabric or wire mesh are attached to the upper and lower surfaces of the belt-shaped mat. A sheet for overlay construction that is characterized by: