Anti-crack type water-stable base layer structure

Abstract

The utility model discloses an anti-crack type water-stable base layer structure, which relates to the field of road construction and comprises a waterproof layer, a base layer main body, an anti-crack layer and a buffer layer which are sequentially arranged from bottom to top, transverse water guiding grooves are formed in the top of the base layer body at intervals, and water collecting pipes are arranged at the bottoms of the grooves and communicated with the longitudinal drainage ditches; the anti-crack layer is a concrete layer doped with polypropylene fibers and steel fibers, and the total mixing amount of the fibers is 0.8%-1.2%; according to the utility model, by arranging a composite structure of the waterproof layer, the base layer main body, the water guide groove of the base layer main body, the fiber-reinforced anti-crack layer and the buffer layer, and cooperating with the deformation coordination design of the expansion joint, the anti-crack performance and the drainage efficiency of the structure are obviously improved; polypropylene fibers and steel fibers in the anti-crack layer are compounded for use, and a zigzag occlusion interface of the buffer layer effectively blocks a crack propagation path, so that the crack occurrence rate can be reduced by more than 70%, and the composite material is suitable for heavy traffic roads and regions with severe temperature difference.

Description

Technical Field

[0001] This utility model belongs to the field of road construction, specifically relating to a crack-resistant water-stabilized base course structure. Background Technology

[0002] Water-stabilized base course, also known as cement-stabilized base course, refers to the foundation of highways or airport runways. It can be divided into water-stabilized crushed stone base course and water-stabilized gravel base course. In construction, it is generally a two-layer course. Water-stabilized crushed stone or (gravel) base course: refers to the foundation material used for highways or runways, which is made by mixing cement with crushed stone or (gravel) according to a certain gradation using a mixer.

[0003] Traditional cement-stabilized crushed stone base courses have the following technical defects:

[0004] Thermal shrinkage cracking: Cement-stabilized materials are prone to transverse cracks when subjected to temperature stress, and the cracks reflect upwards, causing damage to the surface layer;

[0005] Interlayer slip: Conventional structures have smooth interlayer interfaces, which are prone to shear failure under vehicle loads;

[0006] Water damage: Water seeps through cracks, causing materials to soften and accelerating structural failure.

[0007] Therefore, we propose a crack-resistant water-stabilized base course structure. Utility Model Content

[0008] This invention provides a crack-resistant water-stabilized base course structure to solve the technical problems mentioned in the background section.

[0009] To solve the above-mentioned technical problems, this utility model provides a crack-resistant water-stabilized base structure, which includes a waterproof layer, a base body, a crack-resistant layer and a buffer layer arranged sequentially from bottom to top;

[0010] The top of the base body is provided with horizontal water guide channels at intervals, and the bottom of the channels is arranged with water collection pipes that are connected to the longitudinal drainage ditch.

[0011] The crack-resistant layer is a concrete layer incorporating polypropylene fibers and steel fibers, with a total fiber content of 0.8%-1.2%.

[0012] The buffer layer is an asphalt-aggregate mixture layer, and its bottom surface forms a serrated interlocking structure with the surface of the crack-resistant layer.

[0013] Preferably, the mass ratio of polypropylene fiber to steel fiber is 1:0.3-0.5, and the lengths are 12-18 mm and 25-35 mm, respectively.

[0014] Preferably, the transverse water guide channel has an inverted trapezoidal cross-section, a channel depth of 3-5cm, a channel width of 10-15cm, and a spacing of 1.5-2.5m.

[0015] Preferably, the waterproof layer is a composite structure of HDPE geomembrane and geotextile, with the geomembrane thickness being 0.3-0.5mm and the geotextile unit area mass being ≥300g / m².

[0016] Preferably, expansion joints are provided at intervals of 8-12m in the base body, the joints are filled with elastic sealant and L-shaped galvanized steel sheets are inserted, and the steel sheets are embedded to a depth of not less than 1 / 3 of the thickness of the base body.

[0017] Preferably, the asphalt mixture of the buffer layer is made of high-viscosity modified asphalt with a penetration of 40-60, and the aggregate gradation is AC-13 discontinuous gradation.

[0018] This invention has the following advantages over the prior art:

[0019] This utility model discloses a crack-resistant water-stabilized base structure. Through the construction of a composite structure consisting of a waterproof layer, a base body and its water-guiding channel, a fiber-reinforced crack-resistant layer, and a buffer layer, combined with the deformation coordination design of the expansion joint, the crack resistance and drainage efficiency of the structure are significantly improved. The combined use of polypropylene fiber and steel fiber in the crack-resistant layer, as well as the sawtooth interlocking interface of the buffer layer, effectively blocks the crack propagation path. Engineering verification shows that this structure can reduce the crack occurrence rate by more than 70% and is suitable for heavy-duty traffic roads and areas with severe temperature differences. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a crack-resistant water-stabilized base course structure according to the present invention;

[0021] Figure 2 This is an exploded structural diagram of a crack-resistant water-stabilized base course structure according to this utility model;

[0022] The following are labeled in the diagram: 1. Base layer; 2. Waterproof layer; 3. Crack-resistant layer; 4. Buffer layer; 5. Expansion joint; 6. L-shaped galvanized steel sheet; 7. Drainage ditch; 8. Water guide channel; 9. Water collection pipe. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments.

[0024] Please see Figure 1-2 This utility model provides a technical solution: a crack-resistant water-stabilized base structure, comprising a waterproof layer 2, a base body 1, a crack-resistant layer 3, and a buffer layer 4 arranged sequentially from bottom to top;

[0025] The top of the base body 1 is provided with horizontal water guide channels 8 at intervals, and the bottom of the channels is arranged with water collection pipes 9 which are connected to the longitudinal drainage ditch 7.

[0026] Crack-resistant layer 3 is a concrete layer incorporating polypropylene fibers and steel fibers, with a total fiber content of 0.8%-1.2%.

[0027] The buffer layer 4 is an asphalt-aggregate mixture layer, and its bottom surface forms a serrated interlocking structure with the surface of the crack-resistant layer 3.

[0028] Furthermore, the mass ratio of polypropylene fiber to steel fiber is 1:0.3-0.5, and the lengths are 12-18 mm and 25-35 mm, respectively.

[0029] Furthermore, the transverse water guide channel 8 has an inverted trapezoidal cross section, a channel depth of 3-5cm, a channel width of 10-15cm, and a spacing of 1.5-2.5m.

[0030] Furthermore, the waterproof layer 2 is a composite structure of HDPE geomembrane and geotextile, with a geomembrane thickness of 0.3-0.5mm and a geotextile unit area mass ≥300g / m².

[0031] Furthermore, expansion joints 5 are set every 8-12m in the base body 1. The joints are filled with elastic sealant and L-shaped galvanized steel sheets 6 are inserted. The steel sheets are embedded to a depth of not less than 1 / 3 of the thickness of the base body 1.

[0032] Furthermore, the asphalt mixture of buffer layer 4 uses high-viscosity modified asphalt with a penetration of 40-60, and the aggregate gradation is AC-13 discontinuous gradation.

[0033] Working principle: By setting up a composite structure of waterproof layer 2, base body 1 and its water channel 8, fiber reinforced crack-resistant layer 3 and buffer layer 4, and with the deformation coordination design of expansion joint 5, the crack resistance and drainage efficiency of the structure are significantly improved. The use of polypropylene fiber and steel fiber in crack-resistant layer 3, as well as the sawtooth interlocking interface of buffer layer 4, effectively blocks the crack propagation path. According to engineering verification, this structure can reduce the crack occurrence rate by more than 70% and is suitable for heavy traffic roads and areas with severe temperature differences.

[0034] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A water stable base course structure against cracking, characterized by: It includes a waterproof layer (2), a base body (1), a crack-resistant layer (3), and a buffer layer (4) arranged from bottom to top. The top of the base body (1) is provided with horizontal water guide grooves (8) at intervals, and the bottom of the groove is provided with water collection pipes (9) and connected to the longitudinal drainage ditch (7); The crack-resistant layer (3) is a concrete layer incorporating polypropylene fibers and steel fibers; The buffer layer (4) is an asphalt-aggregate mixture layer, and its bottom surface forms a sawtooth interlocking structure with the surface of the crack-resistant layer (3).

2. The crack-resistant water-stabilized base course structure according to claim 1, characterized in that, The lengths of the polypropylene fibers and steel fibers are 12-18 mm and 25-35 mm, respectively.

3. The water stable base course structure according to claim 1, wherein The transverse water guide channel (8) has an inverted trapezoidal cross section, a channel depth of 3-5cm, a channel width of 10-15cm, and a spacing of 1.5-2.5m.

4. The water stable base course structure according to claim 1, wherein The waterproof layer (2) is a composite structure of HDPE geomembrane and geotextile, with a geomembrane thickness of 0.3-0.5mm and a geotextile unit area mass ≥300g / m².

5. The water stable base course structure according to claim 1, wherein Expansion joints (5) are set every 8-12m in the base body (1), the joints are filled with elastic sealant and L-shaped galvanized steel sheets (6) are inserted, and the steel sheets are buried to a depth of not less than 1 / 3 of the thickness of the base body (1).

6. The water stable base course structure according to claim 1, wherein The asphalt mixture of the buffer layer (4) is made of high-viscosity modified asphalt with a penetration of 40-60 and the aggregate gradation is AC-13 discontinuous gradation.

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