Pavement structure suitable for flood detention area

Abstract

The pavement structure suitable for the flood detention area comprises a building aggregate roadbed, a gravel leveling layer, a graded gravel hardcore, a pervious concrete base layer, an isolating layer and an assembly type prestressed concrete pavement slab layer which are sequentially arranged from bottom to top, the structure is characterized in that the building aggregate roadbed, the broken stone leveling layer, the graded broken stone hardcore and the pervious concrete base layer are all made of water-resistant materials; the fabricated prestressed concrete panel layer is formed by paving continuously paved pre-tensioned pavement panels, and the adjacent pre-tensioned pavement panels are connected through self-stress seams. According to the pavement structure suitable for the flood detention area, the waterproof material is adopted, the mechanical property of each layer is basically not changed when the pavement structure is immersed in water, the strength is not reduced, water in each layer of a road can quickly flow out after the water level is reduced, and the road is not influenced in the later period; and the flood cannot pass through the crack to corrode the steel strand, so that the whole road is large in bearing capacity and high in durability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a road surface structure suitable for flood detention area more specifically, especially relate to a road surface structure suitable for flood detention area. BACKGROUND

[0002] With the rapid development of our country economy, the road network distribution is also more and more dense, and the corresponding highway built in flood detention area is also more and more, and the elevation of flood detention area is generally low, and most of them are adjacent to river and lake to facilitate flood storage, resulting in higher underground water, so the highway subgrade is designed to be lower, and therefore the designed road surface structure needs to be waterproof and water-resistant, and the roadbed filling material also needs to have the characteristics of water resistance, that is, when the water level of flood detention area rises to the height of the roadbed or exceeds the height of the roadbed, the mechanical properties of the roadbed filling material are required to be unchanged, and when the flood recedes, the water in the roadbed can be quickly discharged without affecting the normal use of the road in the flood detention area. Therefore, the utility model provides a road surface structure suitable for flood detention area. SUMMARY

[0003] The utility model provides a road surface structure suitable for flood detention area to overcome the shortcoming of above-mentioned technical problem.

[0004] The road surface structure suitable for flood detention area of the utility model, including building granular subgrade, broken stone leveling layer, graded broken stone cushion layer, pervious concrete base layer, isolation layer and assembly type prestressed concrete road surface panel layer that are sequentially arranged from bottom to top, characterized in that: building granular subgrade, broken stone leveling layer, graded broken stone cushion layer and pervious concrete base layer all adopt water-resistant material, the assembly type prestressed concrete panel layer is laid by continuously laying pretensioned pavement panel, and adjacent pretensioned pavement panels are connected through self-stress joints.

[0005] The road surface structure suitable for flood detention area of the utility model, building granular subgrade adopts brick or concrete block formed by building demolition, and the thickness of building granular subgrade is 0.5m~1.5m, and the compaction degree of building granular subgrade is not less than 95%.

[0006] The road surface structure suitable for flood detention area of the utility model, broken stone leveling layer is composed of broken stone, and the thickness of broken stone leveling layer is 5cm~10cm.

[0007] The road surface structure suitable for flood detention area of the utility model, the thickness of graded broken stone cushion layer is 20cm~30cm, and the compaction degree of graded broken stone cushion layer is not less than 97%.

[0008] The road surface structure suitable for flood detention area of the utility model, isolation layer is composed of double-layer geotextile.

[0009] The present invention relates to a road surface structure suitable for flood detention areas, wherein the pre-tensioned pavement slab is composed of pre-tensioned concrete and steel strands uniformly poured into the pre-tensioned concrete, and the length direction of the steel strands is consistent with the length direction of the pre-tensioned pavement slab.

[0010] The present invention relates to a road surface structure suitable for flood detention areas, wherein the thickness of the pre-tensioned pavement slab is 18cm~24cm, the grade of the pre-tensioned slab concrete is 40MPa~45MPa, and the steel strands are laid 1cm~2cm below the centerline of the pre-tensioned pavement slab.

[0011] The present invention relates to a pavement structure suitable for flood detention areas, wherein the self-stressing joint is composed of high-expansion concrete and self-stressing steel bars cast in the high-expansion concrete, and the length direction of the self-stressing steel bars is consistent with the length direction of the pre-tensioned pavement slab.

[0012] The present invention relates to a pavement structure suitable for flood detention areas, wherein the high-expansion concrete has a strength of 40MPa~45MPa, and the self-stressing steel bars are welded together from steel bars pre-embedded in two adjacent pre-tensioned pavement slabs.

[0013] The beneficial effects of this utility model are as follows: The road structure of this utility model, applicable to flood detention areas, consists of, from bottom to top, a building aggregate subgrade, a crushed stone leveling layer, a graded crushed stone cushion layer, a permeable concrete base layer, an isolation layer, and a precast prestressed concrete pavement slab layer. The building aggregate subgrade, crushed stone leveling layer, graded crushed stone cushion layer, and permeable concrete base layer all use water-resistant materials. Due to the use of water-resistant materials, when the water level reaches or submerges the subgrade during the flood season, the mechanical properties of each layer immersed in water remain largely unchanged, and the strength does not decrease. When the water level recedes, the water in each layer can quickly flow out, ensuring that the mechanical properties of the road are not affected and that it can be used normally for a long time. Because the precast prestressed concrete pavement slab layer is constructed using pre-tensioned pavement slabs connected by self-stress joints, the pavement will basically not develop cracks, and water will not corrode the steel strands through the cracks, resulting in high load-bearing capacity and high durability for the entire road.

[0014] Furthermore, the granular building material roadbed is composed of bricks or concrete blocks formed from building demolition. The granular building material is water-resistant and inexpensive, can be sourced locally, and can turn construction waste into a valuable resource for reuse, thus achieving resource conservation and environmental friendliness. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the road surface structure applicable to flood detention areas according to this utility model;

[0016] Figure 2 This is a cross-sectional view of the prefabricated prestressed concrete pavement slab layer in this utility model.

[0017] In the figure: 1 building granular subgrade, 2 gravel leveling layer, 3 graded gravel cushion, 4 pervious concrete base, 5 isolation layer, 6 prefabricated prestressed concrete pavement panel layer, 7 pretensioned pavement panel, 8 pretensioned panel concrete, 9 steel strand, 10 self-stress steel bar, 11 high-expansion concrete. DETAILED DESCRIPTION

[0018] The utility model will be further described below in combination with the drawings and examples.

[0019] As Figure 1 shown, the structure diagram of the road surface structure suitable for the flood detention area of the utility model is given, which is provided with building granular subgrade 1, gravel leveling layer 2, graded gravel cushion 3, pervious concrete base 4, isolation layer 5 and prefabricated prestressed concrete pavement panel layer 6 from bottom to top in the flood detention area, and building granular subgrade 1, gravel leveling layer 2, graded gravel cushion 3 and pervious concrete base 4 all adopt water-resistant materials, that is, their mechanical properties are basically not affected when being subjected to water bubble or immersion, and their strength will not be reduced. The prefabricated prestressed concrete pavement panel layer 6 shown is composed of continuously laid pretensioned pavement panel 7, and adjacent pretensioned pavement panels 7 are connected through self-stress joints.

[0020] Since building granular subgrade 1, gravel leveling layer 2, graded gravel cushion 3 and pervious concrete base 4 all adopt water-resistant materials, when the water level of the flood detention area rises due to the arrival of flood period, the water level rises to or above the road subgrade, even if water is immersed in each layer, the mechanical properties of each layer will not be basically affected, and the strength of each layer will not be reduced; after the water level decreases, the water immersed in each layer can be quickly drained, ensuring the normal use of the road after the end of flood detention.

[0021] At the same time, since the prefabricated prestressed concrete pavement panel layer 6 adopts continuously laid pretensioned pavement panel 7, and adjacent pretensioned pavement panels 7 are connected through self-stress joints, the prefabricated prestressed concrete pavement panel layer 6 formed has good bearing capacity and basically will not have transverse cracks, so that when the water level of the flood detention area rises, water will not enter the corrosion steel strand 9 through the cracks, so that the road formed has large bearing capacity and high durability.

[0022] The building granular subgrade 1 shown adopts the bricks or concrete blocks formed after the demolition of buildings, and is compacted by a road roller after being laid, so that, since building granular material is used as the subgrade at the bottom, the reuse of building waste is realized, and good resource saving and environmental friendliness are achieved. The gravel leveling layer 2 shown is composed of gravel stones, and is laid on the top of the building granular subgrade 1 and compacted by a road roller after being laid, so as to realize the leveling effect.

[0023] The graded crushed stone subbase 3 shown is laid on top of the leveling layer 2. It can be made of a mixture of coarse, medium, and fine aggregates, or it can be formed using unscreened crushed stone and stone chips. After laying, it is compacted. The permeable concrete base course 4 shown is formed by pouring permeable concrete. Permeable concrete has good permeability and water resistance. When the water level in the flood detention area recedes, the infiltrated water can be quickly drained, ensuring that its mechanical properties are not affected by water immersion. The isolation layer 5 shown is laid on top of the permeable concrete base course 4, located between the permeable concrete base course 4 and the precast prestressed concrete pavement slab layer 6. The isolation layer 5 is composed of two layers of geotextile.

[0024] The thickness of the granular roadbed 1 ranges from 0.5m to 1.5m. To ensure the stability of the roadbed, the compaction degree of the granular roadbed 1 is not less than 95%. The thickness of the crushed stone leveling layer 2 is 5cm to 10cm. The thickness of the graded crushed stone cushion layer 3 is 20cm to 30cm, and the compaction degree of the graded crushed stone cushion layer 3 is not less than 97%.

[0025] like Figure 2 The diagram shows a cross-sectional view of the precast prestressed concrete pavement layer 6 of this invention. The precast prestressed concrete pavement layer 6 is composed of pre-tensioned pavement panels 7 continuously laid along the road's driving direction, with adjacent pre-tensioned pavement panels 7 connected by self-stressing joints. The pre-tensioned pavement panel 7 consists of pre-tensioned concrete 8 and steel strands 9 cast within the pre-tensioned concrete 8. The length direction of the steel strands 9 is consistent with the length direction of the pre-tensioned pavement panel 7 (i.e., the road's driving direction). During the casting process of the pre-tensioned pavement panel 7, the steel strands 9 apply tensile stress to the tensioning equipment. After release, the steel strands 9 cause the pre-tensioned pavement panel 7 to have compressive stress. Pre-tensioned pavement panels 7 with compressive stress are better able to withstand the pressure exerted on them during vehicle travel, preventing longitudinal cracks from forming during long-term use.

[0026] The adjacent pre-tensioned pavement panels 7 shown are spaced apart, forming a self-stressing joint between them. The self-stressing joint is connected by self-stressing steel bars 10, and high-expansion concrete 11 is poured into the self-stressing joint 10. The self-stressing steel bars 10 are formed by welding two sections of steel bars pre-embedded in the end face of the pre-tensioned pavement panels 7. After the high-expansion concrete 11 is poured and solidified, its expansion puts the ends of the pre-tensioned pavement panels 7 under pressure, ensuring the firmness of the ends of the pre-tensioned pavement panels 7.

[0027] The construction steps of the road surface structure suitable for the flood detention area are as follows: 1) firstly, laying the building granular roadbed 1 with the thickness meeting the requirements, and compacting by using the road roller, and the compaction degree is not less than 95%; 2) then, laying the broken stone leveling layer 2 formed by broken stones, and compacting and leveling; 3) then, laying the graded broken stone cushion layer 3, and compacting; 4) then, pouring the pervious concrete base 4 on the graded broken stone cushion layer 3, and curing; 5) after the curing of the pervious concrete base 4 is finished, laying the isolation layer 5, laying the pre-tensioned road surface plate 7 on the isolation layer 5, and welding the end portions of the adjacent pre-tensioned road surface plates 7 together to form the self-stress steel bars 10, and then pouring the high-expansion concrete 11 and curing to form the assembled prestressed concrete road surface plate layer.

Claims

1. A pavement structure suitable for flood detention areas, comprising, from bottom to top, a building aggregate subgrade (1), a crushed stone leveling layer (2), a graded crushed stone cushion layer (3), a permeable concrete base course (4), an isolation layer (5), and a precast prestressed concrete pavement slab layer (6); characterized in that: The granular roadbed, crushed stone leveling layer, graded crushed stone cushion layer and permeable concrete base layer are all made of water-resistant materials; the prefabricated prestressed concrete panel layer is made of continuously laid pre-tensioned road panels (7), and adjacent pre-tensioned road panels are connected by self-stress joints.

2. The pavement structure suitable for flood detention areas according to claim 1, characterized in that: The building aggregate roadbed (1) is made of bricks or concrete blocks formed by building demolition. The thickness of the building aggregate roadbed is 0.5m to 1.5m and the compaction degree of the building aggregate roadbed is not less than 95%.

3. The pavement structure suitable for flood detention areas according to claim 1 or 2, characterized in that: The crushed stone leveling layer (2) is composed of crushed stones, and the thickness of the crushed stone leveling layer is 5cm~10cm.

4. The pavement structure suitable for flood detention areas according to claim 1 or 2, characterized in that: The graded crushed stone cushion layer (3) has a thickness of 20cm~30cm and a compaction degree of not less than 97%.

5. The pavement structure suitable for flood detention areas according to claim 1 or 2, characterized in that: The isolation layer (5) is composed of two layers of geotextile.

6. The pavement structure suitable for flood detention areas according to claim 1 or 2, characterized in that: The pre-tensioned pavement panel (7) is composed of pre-tensioned concrete (8) and steel strands (9) uniformly poured into the pre-tensioned concrete. The length direction of the steel strands is consistent with the length direction of the pre-tensioned pavement panel.

7. The pavement structure suitable for flood detention areas according to claim 6, characterized in that: The thickness of the pre-tensioned pavement panel (7) is 18cm~24cm, the grade of the pre-tensioned concrete (8) is 40MPa~45MPa, and the steel strand (9) is laid 1cm~2cm below the centerline of the pre-tensioned pavement panel (7).

8. The pavement structure suitable for flood detention areas according to claim 1 or 2, characterized in that: The self-stressing joint is composed of high-expansion concrete (11) and self-stressing steel bars (10) cast in the high-expansion concrete. The length direction of the self-stressing steel bars is consistent with the length direction of the pre-tensioned pavement slab (7).

9. The pavement structure suitable for flood detention areas according to claim 8, characterized in that: The high-expansion concrete (11) has a grade of 40MPa~45MPa, and the self-stressing steel bars (10) are welded from the steel bars pre-embedded in two adjacent pre-tensioned road panels.

Images