Composite pavement structure layer
By using U-shaped bonding cushion, base layer and base layer in the pavement structure, and using different contents of cement to stabilize granite gravel materials, the problem of pavement structure being susceptible to load is solved, and the shear resistance is improved The service life of the road surface structure is improved efficiently and economically.
Patent Information
- Application Number
- CN202323505633.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-21
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-21
AI Technical Summary
The existing pavement structure is susceptible to temperature changes, humidity changes and vehicle loads, resulting in settlement and brittle fracture, the interlayer bonding effect is not ideal, and the shear resistance is weak, resulting in road damage and short service life.
The composite pavement structural layer design is adopted, including a cushion layer, a base layer and a base layer. Each layer is U-shaped and the granite gravel material is stabilized through different contents of cement to improve shear resistance and toughness.
It improves the shear resistance and fatigue resistance of the road surface, extends the service life, avoids interlayer slippage, enhances the overall quality, and is simple in construction technology and low in cost.
Smart Images
Figure CN222139681U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pavement structure design, and more specifically, to a composite pavement structure layer. Background Art
[0002] At present, most pavement structures are made of cement concrete, steel-fibered concrete and asphalt concrete, which are easily affected by temperature changes, humidity changes, vehicle loads, etc., which may cause settlement of the pavement structure base or its lower subgrade, resulting in brittle fracture of the rigid cement concrete pavement, seriously affecting vehicle driving safety and equipment safety, and leading to road damage, short service life and other problems.
[0003] Moreover, the interlayers are the weak zones in the road structure layers, including the cushion layer and the base layer. The cushion layer and the base layer are important structural layers in the road, which bear and transmit the horizontal and vertical loads from the road surface. However, the interlayers of the road pavement structure are only roughly treated by spreading cement cementitious materials. The bonding effect between the layers after treatment is not ideal. The existing road structure layers have weak shear resistance. With the long-term action of the load, shear slip often occurs in the weak zones between the layers, and the interlayer slip phenomenon affects the road surface quality. Utility Model Content
[0004] In order to solve the above technical problems, the present utility model provides a composite pavement structure layer. To achieve the above purpose, the present utility model provides the following technical solutions:
[0005] A composite pavement structure layer comprises a cushion layer, a subbase layer and a base layer from bottom to top, wherein the cushion layer, the subbase layer and the base layer have the same layer thickness, the width of both sides of the cushion layer is greater than the width of the subbase layer, the width of the subbase layer is greater than the width of the base layer, the cushion layer and the subbase layer are fitted in a U-shape, and the subbase layer and the base layer are fitted in a U-shape.
[0006] Preferably, the thickness of the cushion layer, subbase layer and base layer is 20 cm.
[0007] Preferably, the cushion layer is 0.2 m wider than the base layer on both sides.
[0008] Preferably, the U-shaped bottom of the cushion layer is 15-20 m long.
[0009] Preferably, the protrusion between the U-shaped bottoms of the two cushion layers is 15-20 m long.
[0010] Preferably, the length of the U-shaped slope is 5 cm.
[0011] Preferably, the cushion layer is made of 1%-2% cement-stabilized granite crushed stones.
[0012] Preferably, the subbase layer is made of 4%-5% cement-stabilized granite crushed stone.
[0013] Preferably, the base layer is made of 5%-6% cement-stabilized granite crushed stone.
[0014] Technical effects and advantages of the utility model:
[0015] The utility model further improves the shear resistance of the pavement structure by fitting the cushion layer, the subbase layer and the base layer in a U-shape. At the same time, each layer uses cement-stabilized granite crushed stones with different contents to enhance the utilization of stone materials such as tunnel slag. The structural layer is made of cement-stabilized granite crushed stones, has good mechanical properties and is low in cost.
[0016] Different layers are composed of cement-stabilized granite gravel with different contents, which combines the advantages of concrete and cement gelling agent and improves the overall performance of the road surface. The U-shaped structure design improves the toughness and fatigue resistance of the road surface and extends the service life of the road surface. The interlayer cushion and base pavement structure are interlocked, and the U-shaped bonding between the layers increases the interlayer shear force, avoids interlayer slippage, and improves the overall quality of the road surface. The construction process is simple, easy to operate, and suitable for large-scale application. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.
[0018] Figure 1 It is a structural schematic diagram of the composite pavement structure layer of the utility model;
[0019] Figure 2 It is a structural schematic diagram of the cross section of the composite pavement structure layer of the utility model;
[0020] Figure numerals: 1- cushion layer, 2- base layer, 3- base layer. DETAILED DESCRIPTION
[0021] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0022] Refer to the instruction manual Figure 1-2 , a composite pavement structure layer of this embodiment includes a cushion layer 1, a subbase layer 2, and a base layer 3;
[0023] Among them: the thickness of cushion layer 1, subbase layer 2 and base layer 3 is 20cm, cushion layer 1 is 0.2m wider than subbase layer 2 on both sides, and each layer is fitted in a U-shape. Cushion layer 1, subbase layer 2 and base layer 3 are all based on a unit of length L, which is 35-45m long. The length of the U-shaped bottom is S, which is 15-20m. The length of the protrusion between the two U-shaped bottoms is B, which is 15-20m. △L is 3-5m, and △s is 5cm.
[0024] The cushion layer 1 is made of 1%-2% cement-stabilized granite crushed stone, the subbase layer 2 is made of 4%-5% cement-stabilized granite crushed stone, and the base layer 3 is made of 5%-6% cement-stabilized granite crushed stone. No adhesive is needed between the layers.
[0025] 2. Implementation methods:
[0026] Pad construction
[0027] (1) Preparation of the underlying layer. The surface of the underlying layer is flat and has been inspected and qualified. Before the cushion layer is constructed, it should be sprinkled with water to moisten it and remove any soil or debris.
[0028] (2) Measurement and staking out. Lay out the boundary of the cushion layer, and at the same time, drive steel chisels every 5m at a distance of 30-40cm from the paving width, set up steel wire ropes on both sides at a spacing of 5m, and mark them.
[0029] (3) Material preparation: The base layer 1 uses 1%-2% cement stabilized granite crushed stone, the subbase layer 2 uses 4%-5% cement stabilized granite crushed stone, and the base layer 3 uses 5%-6% cement stabilized granite crushed stone. Each mixture is mixed in a centralized factory. The water content of the mixture is 0.5-1% higher than the optimal water content during mixing. The ingredients must be accurately batched and mixed evenly. Large dump trucks are used for transportation, and the transportation time should not exceed 2 hours.
[0030] (4) Paving and rolling: Two pavers are used for joint paving. The distance between the two pavers is 5-10m, and the wheel tracks overlap by 0.05-0.1m to ensure that the paving thickness of each unit is consistent. The base layer 1 and the subbase layer 2 are constructed in two layers. The paving thickness is 10cm per time. The rolling is carried out in the form of initial compaction, secondary compaction and final compaction. The initial compaction is static compaction, the secondary compaction is carried out by a vibrating roller, and the final compaction is carried out by a large roller of more than 12 tons. After the initial compaction and secondary compaction, stone chips should be spread to fill the pores. A small roller is used at the steps to assist in manual compaction. The transverse joints should be set at a low position, and the joints of each layer should be staggered. The moisture content should be supplemented before the joint construction.
[0031] (5) Health preservation
[0032] After the base layer 2 and base layer 3 are formed, cover them with burlap sacks. During high-temperature construction, use double-layer burlap sacks to overlap and cover them. Sprinkle water to keep them moist. Always keep the burlap sacks moist. The curing period is no less than 7 days, and vehicles are prohibited from passing during the curing period.
[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A composite pavement structure layer, the composite pavement structure layer comprises a cushion layer, a subbase layer, and a base layer in order from bottom to top, characterized in that: The cushion layer, subbase layer and base layer have the same thickness, the width of both sides of the cushion layer is greater than that of the subbase layer, the width of the subbase layer is greater than that of the base layer, the cushion layer and the subbase layer are fitted in a U-shape, and the subbase layer and the base layer are fitted in a U-shape.
2. A composite pavement structure layer according to claim 1, characterized in that: The thickness of the cushion layer, subbase layer and base layer is 20 cm.
3. A composite pavement structure layer according to claim 1, characterized in that: The cushion layer is 0.2m wider than the base layer on both sides.
4. A composite pavement structure layer according to claim 1, characterized in that: The U-shaped bottom of the cushion layer is 15-20m long.
5. A composite pavement structure layer according to claim 4, characterized in that: The protrusion between the U-shaped bottoms of the two cushion layers is 15-20m long.