Water-stable base construction process and pavement structure

Abstract

The application discloses a water-stable base layer construction process and a pavement structure, and construction steps of the water-stable base layer construction process comprise the following steps: driving anchor piles into the inside of a soil layer, the anchor piles are uniformly distributed along the base layer width direction at an interval of 1-2 m, the anchor piles are uniformly distributed along the length direction of the base layer at an interval of 2-3 m, wherein a base root penetrating the soil layer and a separation-preventing part crossing the upper surface of the soil layer are arranged on the anchor piles, a sand layer and an epoxy resin layer are sequentially laid on the upper surface of the soil layer, the sand layer covers the periphery of the separation-preventing part, and the top of the anchor pile is sealed by the epoxy resin layer, when the epoxy resin layer is in a hot melt state, the epoxy resin layer is filled in the inside of the sand layer by vibration; the construction process is convenient and has a short maintenance period, the pavement structure formed by the construction process has good overall compressive capacity, the overall tensile strength of the pavement is high, and in addition, the stability is good, and delamination is not prone to occur.

Description

TECHNICAL FIELD

[0001] The present application relates to the road construction process technical field, especially to a water stable base construction process and a pavement structure. BACKGROUND

[0002] At present, the water stable base is full name of cement stable base; in the construction, it usually refers to the cement layer arranged above the pavement, and the sufficient strength and the proper rigidity are the basic requirements of the water stable base, which needs to be paid special attention in the construction process of the water stable base.

[0003] The related art can refer to the Chinese patent with the authorized announcement number CN106835876B, which discloses a water stable base construction process and a pavement structure, a hollow film mat is laid on the soil layer; a vertical pipe in communication with the inside of the hollow film mat is arranged on the hollow film mat, and the vertical pipe is inserted into the soil layer; after the asphalt layer is dried, the threaded rod is taken out, the handrail is inserted into the vertical pipe; after 90 days to 120 days, the adjacent handrails are pulled out, the epoxy resin is poured into the vertical pipe, until the epoxy resin overflows from the adjacent vertical pipes, and then the handrails are inserted into the vertical pipes to close the vertical pipes; by pouring the epoxy resin into the vertical pipe, the hollow film mat is filled, the gap is eliminated, the soil can continue to support the cement layer, the metal net and the asphalt layer, the downward settlement of the road is avoided, and the air in the hollow film mat is discharged outward through other vertical pipes.

[0004] However, in the construction process of the water stable base, the film mat needs to be laid on the gravel layer, which is not only time-consuming and laborious, but also separates the epoxy resin layer and the gravel layer into two separate parts, the pavement structure made by the process, the relative dislocation and delamination between the epoxy resin layer and the upper structure and the gravel layer, and the overall stability is poor; in addition, the strength of the cement is low, the construction method of simply pouring the cement not only greatly prolongs the maintenance time, but also the pavement structure made by the process has poor overall compressive and tensile strength, is easy to crack and form pavement reflection cracks, and after the cracks are generated, the load is sensitive, and the damage is fast after overload, and is not easy to repair. SUMMARY

[0005] The present application provides a water stable base construction process and a pavement structure, which is convenient to construct and has a short maintenance period, the overall compressive capacity of the pavement structure formed by the construction process is good, the overall tensile strength of the pavement is high, and in addition, the stability is good and delamination is not easy to occur.

[0006] The water stable base construction process and the pavement structure provided by the present application adopt the following technical solutions:

[0007] A water stable base construction process, the construction steps of which include:

[0008] S1: punch into the interior of the soil layer anchor pile, the anchor pile along the base layer width direction according to 1-2 m interval evenly distributed, the anchor pile along the length direction of the base layer according to 2-3 m interval evenly distributed, wherein the anchor pile is provided with the base root through the soil layer and the anti-separation part beyond the soil layer upper surface;

[0009] S2: the upper surface of the soil layer is sequentially laid with a gravel layer and an epoxy resin layer, the gravel layer covers the periphery of the anti-separation part, and the top of the anchor pile is sealed with the epoxy resin layer, when the epoxy resin layer is in a hot melt state, the epoxy resin layer is filled in the interior of the gravel layer by vibrating;

[0010] S3: a plurality of groups of first metal mesh layers are laid on the epoxy resin layer, and the edges of adjacent two groups of first metal mesh layers are overlapped by 20-30 cm;

[0011] S4: at least two rows of first embedded steel pipes parallel to the long side of the water-stable base layer are placed on the first metal mesh layer, wherein the first embedded steel pipe comprises a first straight pipe and L-shaped pipe connectors provided at both ends of the first straight pipe and opening vertically upward, the two groups of L-shaped pipe connectors are in communication with the first straight pipe, and form a channel opening vertically upward at both ends, a plurality of groups of first straight pipes are arranged in a straight line along the long side direction of the water-stable base layer, and a gap is formed between adjacent two groups of first straight pipes, the range of the gap is 10-25 cm, and the gaps between the two rows of first embedded steel pipes are staggered;

[0012] S5: a limiting steel pipe matched with the opening of the L-shaped pipe connector is inserted into the opening of the L-shaped pipe connector, so that the limiting steel pipe is perpendicular to the water-stable base layer, and a plug is installed at the top end of the limiting steel pipe;

[0013] S6: cement mixture is laid on the first metal mesh layer, and is vibrated until the cement mixture completely covers the first embedded steel pipe and is 2-3 cm higher than the upper surface of the first embedded steel pipe, and then is cured and dried to form a first cement layer;

[0014] S7: then the plug is removed, a first steel bar matched with the L-shaped pipe is passed through the channel, one end of the first steel bar is welded and fixed on one L-shaped pipe, the other end of the first steel bar is continuously tensioned using a tension of 10-20 KN, and after 20-30 min, the first steel bar generates an inward stress along the long side direction of the water-stable base layer, then the prestressed steel bar is relaxed, and the other end of the first steel bar is fixed on the other L-shaped pipe by using an anchor, to obtain a prestressed first cement layer;

[0015] S8: a second metal mesh layer is laid on the prestressed first cement layer, and the edges of adjacent two groups of second metal mesh layers are overlapped by 50-60 cm;

[0016] S9: At least two rows of second embedded steel pipes parallel to the short side of the water-stable base layer are arranged on the second metal mesh layer, wherein the second embedded steel pipes include second straight pipes and T-shaped pipe connectors arranged at both ends of the second straight pipes, a plurality of groups of first straight pipes are arranged in a linear manner along the short side direction of the water-stable base layer, and a gap is formed between adjacent two groups of first straight pipes, the range of the gap is 5-10 cm, and the gaps between the two rows of first embedded steel pipes are staggered with each other;

[0017] S10: The T-shaped pipe connectors are inserted into the openings of the limiting steel pipes, vertical pipes are taken and vertically installed on the T-shaped pipe connectors, and sealing plugs are installed at the top of the vertical pipes;

[0018] S11: Cement mixture is laid on the second metal mesh layer, and is vibrated until the cement mixture completely covers the second embedded steel pipes, and is poured to the middle position of the vertical pipes, and is cured and dried to form a second cement layer;

[0019] S12: A second steel bar matched with the T-shaped pipe connector is passed through the second embedded steel pipe, one end of the second steel bar is welded and fixed on one T-shaped pipe connector, the other end of the first steel bar is continuously tensioned using a pulling force of 20-25 KN, and after maintaining for 10-20 min, the second steel bar generates an inward stress in the short side direction of the water-stable base layer, then the prestressed steel bar is released, and the other end of the second steel bar is fixed on another T-shaped pipe connector by using an anchor, hot-melt state epoxy resin is injected into the upward opening of the vertical pipe until the opening of the vertical pipe is blocked, and a prestressed second cement layer is obtained;

[0020] S13: Asphalt is laid on the prestressed second cement layer to form an asphalt layer, and the asphalt layer is flattened by a plurality of road rollers until the top opening of the vertical pipe is flush.

[0021] By adopting the above technical scheme, when the first cement layer reaches 100% of the design strength, the first steel bar is tensioned in the L-shaped pipe to generate a first prestress in the first embedded steel pipe, wherein the first prestress directly acts on the first embedded steel pipe and applies the first prestress to the middle position of the first embedded steel pipe along the axial direction of the first embedded steel pipe, so that the first embedded steel pipe has a tendency to arch upward in the middle, the stress diagram of the first prestress can be referred to as shown in Figure 3 , and the first embedded steel pipe is distributed in a linear manner along the long side direction of the water-stable base layer, thereby greatly improving the tensile strength of the long side of the water-stable base layer;

[0022] When the second cement layer reaches 100% of the design strength, the second steel bar is tensioned inside the T-shaped pipe to generate a second prestress inside the second embedded steel pipe, wherein the second prestress directly acts on the second embedded steel pipe and applies a second prestress to the middle position of the second embedded steel pipe along the axial direction of the second embedded steel pipe, so that the second embedded steel pipe has a tendency to arch in the middle, and the stress diagram of the second prestress can be referred to Figure 4 The second embedded steel pipe is linearly distributed in the short side direction of the water stable base layer, thereby greatly improving the tensile strength of the short side of the water stable base layer.

[0023] Preferably, in S6, when the first cement layer is dried to a moisture content of 11-15%, the first cement layer is flattened by static pressure rolling by multiple road rollers, and the flattening is 2-3 cm higher than the upper surface of the first embedded steel pipe, the distance between adjacent road rollers is 20-25 meters, and the adjacent road rollers overlap by 60% of the wheel width during rolling, and the rolling speed of the road roller is 0.23 meters per second to 0.33 meters per second.

[0024] By adopting the above technical scheme, the strength of the first cement layer is improved.

[0025] Preferably, in S2, the sand and gravel layer is laid to a thickness of 5-6 cm, and the particle diameter of the sand and gravel layer is 3-5 cm.

[0026] By adopting the above technical scheme, the overall compression degree of the soil layer is improved, the bearing effect is good, and the phenomenon of local collapse of the soil layer is less likely to occur.

[0027] Preferably, in S11, when the second cement layer is dried to a moisture content of 7-8%, the second cement layer is flattened by vibration rolling by multiple road rollers, and the flattening is to the middle position of the vertical pipe, the distance between adjacent road rollers is 15-20 meters, and the adjacent road rollers overlap by 60% of the wheel width during rolling, and the rolling speed of the road roller is 0.20 meters per second to 0.30 meters per second.

[0028] By adopting the above technical scheme, the strength of the second cement layer is improved.

[0029] Preferably, in S6, S7, S11 and S12, when the internal moisture content of the first cement layer, the prestressed first cement layer, the second cement layer and the prestressed second cement layer is lower than the construction condition value, water is sprinkled on the surface of the first cement layer, the prestressed first cement layer, the second cement layer and the prestressed second cement layer, and the moisture content of the first cement layer, the prestressed first cement layer, the second cement layer and the prestressed second cement layer is detected again after 20-25 minutes.

[0030] By adopting the technical scheme, in the construction stage, the first cement layer, the prestressed first cement layer, the second cement layer and the prestressed second cement layer are maintained.

[0031] Preferably, in step S12, the hot-melt epoxy resin passes through the vertical pipe, the T-shaped pipe connector and the L-shaped pipe in sequence, and fills the internal space of the first embedded steel pipe and the second embedded steel pipe, and after cooling for 1-2 days, the epoxy resin is solidified in the first embedded steel pipe and the second embedded steel pipe.

[0032] By adopting the technical scheme, by injecting the hot-melt epoxy resin, the voids in the first embedded steel pipe and the second embedded steel pipe are filled, on the one hand, the inside of the first embedded steel pipe and the second embedded steel pipe is in a solid structure, on the other hand, the cooled epoxy resin forms an integral whole between the first embedded steel pipe and the first steel bar and between the second embedded steel pipe and the second steel bar, thereby ensuring the stability of the prestress of the first embedded steel pipe and the second embedded steel pipe.

[0033] On the other hand, heat is conducted through the vertical pipe to the T-shaped pipe connector and the L-shaped pipe in sequence, and the internal space of the first embedded steel pipe and the second embedded steel pipe is preheated, and after heating at a temperature of 160 degrees Celsius for 1H, the epoxy resin is in a hot-melt state in the first embedded steel pipe and the second embedded steel pipe, which facilitates replacement of the first steel bar and the second steel bar and facilitates re-tensioning of the first steel bar and the second steel bar, thereby playing a role of maintenance. The maintenance is convenient and easy to operate.

[0034] Preferably, a pavement structure formed by a water-stable base construction process comprises, from top to bottom, an asphalt layer, a second cement layer, a second metal mesh layer, a first cement layer, a first metal mesh layer, an epoxy resin layer, a gravel layer and a soil layer, the inside of the first cement layer is sequentially provided with the first embedded steel pipe and the first metal mesh layer from top to bottom, the first metal mesh layer is provided with at least two rows, the inside of the second cement layer is sequentially provided with the second embedded steel pipe and the second metal mesh layer from top to bottom, and the first embedded steel pipe is matched with the second embedded steel pipe.

[0035] By adopting the technical scheme, the pavement structure formed by the water-stable base construction process has good compressive strength and high overall tensile strength, and is stable and less likely to delaminate.

[0036] Preferably, the first embedded steel pipes in the multiple rows are parallel to each other and are distributed in several groups at equal intervals along the long edge direction of the water-stable base.

[0037] By adopting the technical scheme, prestress is generated in the long edge direction of the water-stable base to enhance the tensile strength in the long edge direction of the water-stable base.

[0038] Preferably, the second embedded steel pipes are parallel to each other and are distributed in several groups at equal intervals along the short side direction of the water-stable base layer.

[0039] By using the above technical solution, prestress is generated in the short side direction of the water-stable base layer to enhance the tensile strength of the water-stable base layer in the short side direction.

[0040] Preferably, the soil layer is internally provided with an anchor pile, the anchor pile comprises several groups of pouring members and anchor bars embedded in the pouring members, the pouring member is in an inverted T-shaped structure, the pouring member comprises a root base embedded in the soil layer and a separation-preventing part penetrating through the gravel layer and the epoxy resin layer, and the anchor bar inclined downward by 45° is arranged on the separation-preventing part.

[0041] By using the above technical solution, the stability of the connection between the soil layer, the gravel layer and the epoxy resin layer is greatly enhanced, and delamination of the soil layer, the gravel layer and the epoxy resin layer is avoided.

[0042] In summary, the present application has the following beneficial effects:

[0043] 1. In the construction process of the water-stable base layer construction process, when the first cement layer and the second cement layer respectively reach 100% of the design strength, the first steel bar is tensioned in the L-shaped pipe, so that the first steel bar generates prestress in the first embedded steel pipe, wherein the first prestress directly acts on the first embedded steel pipe and applies the first prestress to the middle position of the first embedded steel pipe along the axial direction of the first embedded steel pipe, so that the first embedded steel pipe has a tendency to arch in the middle, and the first embedded steel pipe is distributed in a straight line in the long side direction of the water-stable base layer, thereby greatly improving the tensile strength of the long side of the water-stable base layer;

[0044] By tensioning the second steel bar in the T-shaped pipe, the second steel bar generates prestress in the second embedded steel pipe, wherein the second prestress directly acts on the second embedded steel pipe and applies the second prestress to the middle position of the second embedded steel pipe along the axial direction of the second embedded steel pipe, so that the second embedded steel pipe has a tendency to arch in the middle, and the second embedded steel pipe is distributed in a straight line in the short side direction of the water-stable base layer, thereby greatly improving the tensile strength of the short side of the water-stable base layer;

[0045] 2. Further, the first steel bar and the second steel bar are generated with a gap in the interior of the first embedded steel pipe and the second embedded steel pipe respectively, and the gap in the first embedded steel pipe and the second embedded steel pipe is filled by injecting hot-melt epoxy resin, so that the interior of the first embedded steel pipe and the second embedded steel pipe is in a solid structure, and on the other hand, the cooled epoxy resin forms an integral whole between the first embedded steel pipe and the first steel bar and between the second embedded steel pipe and the second steel bar, thereby ensuring the stability of the prestress of the first embedded steel pipe and the second embedded steel pipe;

[0046] In still another aspect, the heat is conducted through the vertical pipe, and then conducted to the T-shaped pipe connector and the L-shaped pipe in sequence, so that the interior space of the first embedded steel pipe and the second embedded steel pipe is preheated, and after heating at a temperature of 160 degrees Celsius for 1H, the epoxy resin is in a hot-melt state in the interior of the first embedded steel pipe and the second embedded steel pipe, so that the first steel bar and the second steel bar are conveniently replaced, and the first steel bar and the second steel bar are conveniently tensioned again, thereby playing a role of maintenance; the maintenance is convenient and easy to operate.

[0047] 3. The pavement structure formed by the water-stable base construction process has good overall compressive capacity, high overall tensile strength of the pavement, and good stability, and is not prone to delamination. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is an exploded structure schematic diagram of the pavement structure in the embodiment;

[0049] Figure 2 is a space distribution structure schematic diagram of the first embedded steel pipe and the second embedded steel pipe in the embodiment;

[0050] Figure 3 is a prestress schematic diagram of the first embedded steel pipe in the embodiment;

[0051] Figure 4 is a prestress schematic diagram of the second embedded steel pipe in the embodiment;

[0052] Figure 5 is a whole structure schematic diagram of the pavement structure in the embodiment;

[0053] Figure 6 is an exploded structure schematic diagram of the soil layer and the anchor pile in the embodiment.

[0054] Explanation of reference signs: 1, soil layer; 2, anchor pile; 21, pouring member; 22, anchor bar; 3, gravel layer; 4, epoxy resin layer; 5, first metal mesh layer; 6, first embedded steel pipe; 61, first straight pipe; 62, L-shaped pipe connecting piece; 7, limiting steel pipe; 8, first cement layer; 9, first steel bar; 10, second metal mesh layer; 11, second embedded steel pipe; 1101, second straight pipe; 1102, T-shaped pipe connecting piece; 12, vertical pipe; 13, second cement layer; 14, asphalt layer. DETAILED DESCRIPTION

[0055] The following detailed description of the application is made with reference to the accompanying drawings, it is necessary to point out here that the following detailed description is only used to further illustrate the application, and cannot be understood as limiting the scope of protection of the application, and those skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0056] The application discloses a water-stable base construction process and a pavement structure, as shown in the drawings. Figure 1 The construction steps of the water-stable base construction process include:

[0057] S1: anchor piles 2 are punched into the inside of the soil layer 1, the anchor piles 2 are uniformly distributed along the base width direction at an interval of 2 m, and the anchor piles 2 are uniformly distributed along the length direction of the base at an interval of 3 m, wherein the anchor piles 2 are provided with a base root penetrating into the soil layer 1 and a separation prevention part beyond the upper surface of the soil layer 1;

[0058] The anchor piles 2 are uniformly distributed in a matrix form in the inside of the soil layer 1, which is used to reinforce the soil layer 1 on the one hand, and the anchor piles 2 can increase the firmness of the contact between the gravel layer 3 and the epoxy resin layer 4 below, avoid dislocation and separation between the gravel layer 3 and the epoxy resin layer 4 and the soil layer 1, and prevent the gravel layer 3 and the epoxy resin layer 4 from peeling off.

[0059] S2: the gravel layer 3 and the epoxy resin layer 4 are sequentially laid on the upper surface of the soil layer 1, the laying thickness of the gravel layer 3 is 6 cm, the particle diameter of the gravel layer 3 is 5 cm, the gravel layer 3 covers the periphery of the separation prevention part, and the top of the anchor pile 2 is sealed by the epoxy resin layer 4, when the epoxy resin layer 4 is in a hot melt state, the epoxy resin layer 4 is filled in the inside of the gravel layer 3 through vibration;

[0060] It should be noted that the epoxy resin layer 4 is formed by pouring the raw material epoxy resin on the surface of the gravel layer 3. The hot melt epoxy resin layer 4 will flow into the gaps in the gravel layer 3, bond the gravel particles in the gravel layer 3 together, and form an integral body with the anchor pile 2. The epoxy resin layer 4 forms an integral body between the gravel layer 3 and the soil layer 1, making the connection between the gravel layer 3 and the soil layer 1 more secure. The hot melt epoxy resin after filling the gaps is poured on the gravel layer 3 to form an epoxy resin thickening layer with a thickness of 3cm.

[0061] S3: Laying a plurality of groups of first metal mesh layers 5 on the epoxy resin layer 4; and the edges of adjacent two groups of first metal mesh layers 5 overlap by 30cm;

[0062] After the epoxy resin thickening layer cools to a semi-solid state, a plurality of groups of first metal mesh layers 5 are laid on the upper surface of the epoxy resin thickening layer, and the lower surfaces of the plurality of groups of first metal mesh layers 5 are in contact with the upper surface of the epoxy resin thickening layer. When the epoxy resin thickening layer is completely solidified, the stability of the gravel layer 3 is enhanced;

[0063] As shown in Figure 2 S4: At least two rows of first embedded steel pipes 6 parallel to the long side of the water-stable base are placed on the first metal mesh layer 5, wherein the first embedded steel pipe 6 includes a first straight pipe 61 and an L-shaped pipe connector 62 provided at both ends of the first straight pipe 61 and having one end open vertically upward. Two groups of L-shaped pipe connectors 62 are in communication with the first straight pipe 61 and form a channel with both ends open vertically upward. A plurality of groups of first straight pipes 61 are arranged in a straight line along the long side direction of the water-stable base, and a gap is formed between adjacent two groups of first straight pipes 61, and the range of the gap is 25cm, and the gaps between the two rows of first embedded steel pipes 6 are staggered;

[0064] The upper surfaces of the plurality of groups of first metal mesh layers 5 are welded and fixed between the first embedded steel pipes 6. The first embedded steel pipes 6 are fixed on the first metal mesh layer 5 in the set arrangement route by double-sided pressure welding. A plurality of rows of first embedded steel pipes 6 are distributed in a straight line along the long side direction of the water-stable base, and the rows are parallel to each other and staggered, which is used to ensure the tensile capacity of the long side of the water-stable base in the horizontal direction and avoid cracking of the long side of the water-stable base in the horizontal direction.

[0065] S5: Taking a limiting steel pipe 7 matching the opening of the L-shaped pipe connector 62, inserting it into the opening of the L-shaped pipe connector 62, making the limiting steel pipe 7 perpendicular to the water-stable base, and installing a plug at the top end of the limiting steel pipe 7;

[0066] The limiting steel pipe 7 is installed on the L-shaped pipe connecting piece 62 by welding, and at this time, the limiting steel pipe 7 is perpendicular to the plane of the water-stable base layer, and is used to increase the longitudinal bearing capacity of the water-stable base layer; in addition, a plug is arranged at the top end of the limiting steel pipe 7, and when the following cement mixture is laid, the plug is used to prevent the cement mixture from entering the inside of the limiting steel pipe 7.

[0067] S6: The cement mixture is laid on the first metal mesh layer 5, and is vibrated until the cement mixture completely covers the first embedded steel pipe 6 and is 3 cm higher than the upper surface of the first embedded steel pipe 6, and then curing and drying are performed to form the first cement layer 8;

[0068] When the first cement layer 8 is dried to a water content of 15%, the first cement layer 8 is statically rolled flat by a plurality of road rollers, and is rolled flat to be 3 cm higher than the upper surface of the first embedded steel pipe 6, the distance between the front and rear adjacent road rollers is 25 m, the front and rear adjacent road rollers overlap by 60% of the wheel width when rolling, and the rolling speed of the road roller is 0.33 m / s;

[0069] The cement mixture is poured on the first metal mesh layer 5 and completely covers the first embedded steel pipe 6, and the cement mixture is tightly combined with the first metal mesh layer 5 after drying, thereby improving the structural strength of the first cement layer 8.

[0070] S7: Then, the plug is removed, the first steel bar 9 matched with the L-shaped pipe is passed through the channel, one end of the first steel bar 9 is welded and fixed on one L-shaped pipe, the other end of the first steel bar 9 is continuously tensioned using a pulling force of 20 KN, and after maintaining for 30 min, the first steel bar 9 generates an inward stress in the length direction of the water-stable base layer, then the prestressed bar is relaxed, and the other end of the first steel bar 9 is fixed on the other L-shaped pipe by using an anchor, thereby obtaining the prestressed first cement layer 8;

[0071] When the first cement layer 8 reaches 100% of the design strength, the first steel bar 9 is tensioned in the inside of the L-shaped pipe, so that the first steel bar 9 generates a first prestress in the inside of the first embedded steel pipe 6, the first prestress directly acts on the first embedded steel pipe 6, and along the axis direction of the first embedded steel pipe 6, the first prestress is applied to the middle position of the first embedded steel pipe 6, so that the first embedded steel pipe 6 has a tendency of upward arching in the middle, the stress diagram of the first prestress can be referred to as shown in FIG. 6, and the first embedded steel pipe 6 is distributed in a straight line in the length direction of the water-stable base layer, thereby greatly improving the tensile strength of the length direction of the water-stable base layer. Figure 3

[0072] S8: The second metal mesh layer 10 is laid on the prestressed first cement layer 8, and the edges of two adjacent groups of the second metal mesh layer 10 overlap by 60 cm;

[0073] ​The upper and lower surfaces of the first cement layer 8 are respectively paved with the second metal mesh layer 10 and the first metal mesh layer 5, so as to enhance the stability of the first cement layer 8 and greatly enhance the integrity of the first cement layer 8.

[0074] S9: At least two rows of second embedded steel pipes 11 parallel to the short side of the water-stable base layer are arranged on the second metal mesh layer 10, wherein the second embedded steel pipe 11 comprises a second straight pipe 1101 and a T-shaped pipe connector 1102 arranged at both ends of the second straight pipe 1101, a plurality of groups of first straight pipes 61 are arranged in a linear manner along the short side direction of the water-stable base layer, and a gap is formed between adjacent two groups of first straight pipes 61, and the range of the gap is 10 cm, and the gaps between the two rows of first embedded steel pipes 6 are staggered with each other.

[0075] The upper surfaces of the plurality of groups of second metal mesh layers 10 and the second embedded steel pipes 11 are welded and fixed, the first embedded steel pipes 6 are fixed on the first metal mesh layer 5 in a set arrangement route by means of double-sided pressure welding, a plurality of rows of first embedded steel pipes 6 are distributed in a linear manner along the short side direction of the water-stable base layer, the rows are parallel to each other and are arranged in a staggered manner, so as to ensure the tensile capacity of the short side of the water-stable base layer in the horizontal direction and avoid cracking of the short side of the water-stable base layer in the horizontal direction.

[0076] S10: The T-shaped pipe connector 1102 is inserted into the opening of the limiting steel pipe 7, a vertical pipe 12 is taken and vertically installed on the T-shaped pipe connector 1102, and a sealing plug is installed at the top of the vertical pipe 12.

[0077] The T-shaped pipe connector 1102 is inserted into the opening of the limiting steel pipe 7 by welding, at this time, the T-shaped pipe connector 1102 is perpendicular to the plane of the water-stable base layer, so as to increase the longitudinal bearing capacity of the water-stable base layer, and the sealing plug is arranged at the top end of the vertical pipe 12, so as to avoid the cement mixture entering the inside of the vertical pipe 12 when the cement mixture is paved.

[0078] S11: The cement mixture is paved on the second metal mesh layer 10, and is vibrated until the cement mixture completely covers the second embedded steel pipe 11 and is poured to the middle position of the vertical pipe 12, and is cured and dried to form a second cement layer 13.

[0079] When the second cement layer 13 is dried to a water content of 8%, a plurality of road rollers are used to vibrate and roll the second cement layer 13, and the rolling is performed to the middle position of the vertical pipe 12, the distance between the front and rear adjacent road rollers is 20 meters, the front and rear adjacent road rollers overlap by 60% of the wheel width when rolling, and the rolling speed of the road roller is 0.30 meters per second.

[0080] The cement mixture is poured on the second metal mesh layer 10 and completely covers the second embedded steel pipe 11. After the cement mixture dries, it is tightly combined with the second metal mesh layer 10, thereby improving the structural strength of the second cement layer 13.

[0081] S12: A second steel bar matched with the T-shaped pipe connector 1102 is passed through the second embedded steel pipe 11, and one end of the second steel bar is welded and fixed on a T-shaped pipe connector 1102. The other end of the first steel bar 9 is continuously tensioned using a pulling force of 25 KN, and after maintaining for 20 min, the second steel bar generates an inward stress in the short side direction of the water-stable base layer. Then, the prestressed steel bar is released, and the other end of the second steel bar is fixed on another T-shaped pipe connector using an anchor. Hot-melt epoxy resin is injected into the upward opening of the vertical pipe 12. The hot-melt epoxy resin passes through the vertical pipe 12, the T-shaped pipe connector 1102, and the L-shaped pipe in turn, and fills the internal space of the first embedded steel pipe 6 and the second embedded steel pipe 11. After cooling for 2 days, the epoxy resin is solidified in the first embedded steel pipe 6 and the second embedded steel pipe 11, until the opening of the vertical pipe 12 is blocked, and a prestressed second cement layer 13 is obtained.

[0082] It is worth noting that when the internal moisture content of the first cement layer 8, the prestressed first cement layer 8, the second cement layer 13, and the prestressed second cement layer 13 is lower than the construction condition value, water is sprayed on the surface of the first cement layer 8, the prestressed first cement layer 8, the second cement layer 13, and the prestressed second cement layer 13. After 20-25 min, the moisture content of the first cement layer 8, the prestressed first cement layer 8, the second cement layer 13, and the prestressed second cement layer 13 is re-detected.

[0083] When the second cement layer 13 reaches 100% of the design strength, the second steel bar is tensioned in the T-shaped pipe to generate prestress in the second embedded steel pipe 11. The second prestress directly acts on the second embedded steel pipe 11 and applies the second prestress to the middle position of the second embedded steel pipe 11 along the axis direction of the second embedded steel pipe 11, so that the second embedded steel pipe 11 has a tendency to arch in the middle. The stress diagram of the second prestress can be referred to as shown in FIG. 6, and the second embedded steel pipe 11 is linearly distributed in the short side direction of the water-stable base layer, thereby greatly improving the tensile strength of the short side of the water-stable base layer. Figure 4

[0084] ​Further, the first steel bar 9 and the second steel bar are respectively arranged in the first embedded steel pipe 6 and the second embedded steel pipe 11, and a gap exists in the first embedded steel pipe 6 and the second embedded steel pipe 11. The gap in the first embedded steel pipe 6 and the second embedded steel pipe 11 is filled with hot-melt epoxy resin, so that the inside of the first embedded steel pipe 6 and the second embedded steel pipe 11 is in a solid structure, and the first embedded steel pipe 6, the first steel bar 9, the second embedded steel pipe 11 and the second steel bar are integrated to ensure the stability of the prestress of the first embedded steel pipe 6 and the second embedded steel pipe 11.

[0085] In another aspect, heat is conducted through the vertical pipe 12, and then conducted to the T-shaped pipe connector 1102 and the L-shaped pipe, so as to preheat the internal space of the first embedded steel pipe 6 and the second embedded steel pipe 11. After heating at 160 degrees Celsius for 1H, the epoxy resin in the first embedded steel pipe 6 and the second embedded steel pipe 11 is in a hot-melt state again, so as to facilitate replacement of the first steel bar 9 and the second steel bar, and facilitate re-tensioning of the first steel bar 9 and the second steel bar, thereby playing a role of maintenance. The maintenance is convenient and easy to operate.

[0086] S13: Laying asphalt on the prestressed second cement layer 13 to form an asphalt layer 14, and flattening the asphalt layer 14 by multiple road rollers until the top opening of the vertical pipe 12 is flush with the asphalt layer 14.

[0087] As shown in Figure 5 , a road surface structure formed by a water-stable base construction process comprises, from top to bottom, an asphalt layer 14, a second cement layer 13, a second metal mesh layer 10, a first cement layer 8, a first metal mesh layer 5, an epoxy resin layer 4, a gravel layer 3 and a soil layer 1. The first cement layer 8 has, from top to bottom, a first embedded steel pipe 6 and a first metal mesh layer 5. The first metal mesh layer 5 has at least two rows. The second cement layer 13 has, from top to bottom, a second embedded steel pipe 11 and a second metal mesh layer 10. The first embedded steel pipe 6 matches the second embedded steel pipe 11.

[0088] As shown in Figure 2 , the multiple rows of first embedded steel pipes 6 are parallel to each other and are distributed at equal intervals along the long side direction of the water-stable base. The first embedded steel pipes 6 are used to generate prestress in the long side direction of the water-stable base to enhance the tensile strength of the water-stable base in the long side direction.

[0089] The multiple rows of second embedded steel pipes 11 are parallel to each other and are distributed at equal intervals along the short side direction of the water-stable base. The second embedded steel pipes 11 are used to generate prestress in the short side direction of the water-stable base to enhance the tensile strength of the water-stable base in the short side direction.

[0090] As shown in Figure 6As shown, the soil layer 1 is equipped with anchor piles 2. The anchor piles 2 include several sets of cast-in-place components 21 and anchor bars 22 embedded inside the cast-in-place components 21. The cast-in-place components 21 have an inverted "T" shaped structure. The cast-in-place components 21 include a base embedded inside the soil layer 1 and an anti-separation part that penetrates the gravel layer 3 and the epoxy resin layer 4. The anchor bars 22, which are inclined downward at 45°, are set on the anti-separation part. This greatly enhances the stability of the connection between the soil layer 1, the gravel layer 3 and the epoxy resin layer 4, and avoids the separation of the soil layer 1, the gravel layer 3 and the epoxy resin layer 4.

[0091] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction technique for a water-stabilized base course, characterized in that: Its construction steps include: S1: Anchor piles (2) are driven into the soil layer (1). The anchor piles (2) are evenly distributed along the width direction of the base layer at a spacing of 1-2m and along the length direction of the base layer at a spacing of 2-3m. The anchor piles (2) are provided with a root part that penetrates the soil layer (1) and an anti-separation part that crosses the upper surface of the soil layer (1). S2: A gravel layer (3) and an epoxy resin layer (4) are laid sequentially on the upper surface of the soil layer (1). The gravel layer (3) covers the periphery of the anti-separation part, and the top of the anchor pile (2) is sealed with the epoxy resin layer (4). When the epoxy resin layer (4) is in a hot-melt state, the epoxy resin layer (4) is filled into the interior of the gravel layer (3) by vibration. S3: Several sets of first metal mesh layers (5) are laid on the epoxy resin layer (4); and the edges of two adjacent sets of first metal mesh layers (5) overlap by 20-30cm; S4: At least two rows of first embedded steel pipes (6) parallel to the long side of the water-stabilized base layer are placed on the first metal mesh layer (5). The first embedded steel pipe (6) includes a first straight pipe (61) and L-shaped pipe connectors (62) with one end open vertically upward at both ends of the first straight pipe (61). The two sets of L-shaped pipe connectors (62) are connected to the first straight pipe (61) and form a channel with both ends open vertically upward. Several sets of first straight pipes (61) are arranged in a straight line along the long side of the water-stabilized base layer, and a gap is formed between two adjacent sets of first straight pipes (61). The gap ranges from 10 to 25 cm, and the gaps between the two rows of first embedded steel pipes (6) are staggered. S5: Take a limiting steel pipe (7) that matches the opening of the L-shaped pipe connector (62), insert it into the opening of the L-shaped pipe connector (62), make the limiting steel pipe (7) perpendicular to the water-stabilized base layer, and install a plug at the top of the limiting steel pipe (7); S6: Lay the cement mixture on the first metal mesh layer (5), vibrate until the cement mixture completely covers the first embedded steel pipe (6) and is 2-3cm higher than the upper surface of the first embedded steel pipe (6), cure and dry to form the first cement layer (8). S7: Then remove the plug, take the first steel bar (9) that matches the L-shaped pipe and pass it through the channel. Weld one end of the first steel bar (9) to an L-shaped pipe. Use a tension of 10KN-20KN to continuously tension the other end of the first steel bar (9). After holding for 20-30 minutes, the first steel bar (9) will generate inward stress along the long side of the water-stabilized base. Then relax the prestressed tendon and use anchors to fix the other end of the first steel bar (9) to another L-shaped pipe to obtain the prestressed first cement layer (8). S8: Lay a second metal mesh layer (10) on the prestressed first cement layer (8), and overlap the edges of two adjacent sets of second metal mesh layers (10) by 50-60cm. S9: At least two rows of second embedded steel pipes (11) parallel to the short side of the water-stabilized base layer are placed on the second metal mesh layer (10). The second embedded steel pipe (11) includes a second straight pipe (1101) and T-shaped pipe connectors (1102) at both ends of the second straight pipe (1101). Several groups of first straight pipes (61) are arranged in a straight line along the short side of the water-stabilized base layer, and a gap is formed between two adjacent groups of first straight pipes (61), and the gap ranges from 5 to 10 cm. The gaps between the two rows of first embedded steel pipes (6) are staggered. S10: Insert the T-shaped pipe connector (1102) into the opening of the limiting steel pipe (7), take the vertical pipe (12) and install it vertically on the T-shaped pipe connector (1102), and install a sealing plug on the top of the vertical pipe (12); S11: Lay the cement mixture on the second metal mesh layer (10), vibrate until the cement mixture completely covers the second pre-embedded steel pipe (11), and pour it to the middle position of the vertical pipe (12), then cure and dry to form the second cement layer (13). S12: Take the second steel bar that matches the T-shaped pipe connector (1102), pass it through the second pre-embedded steel pipe (11), and weld one end of the second steel bar to a T-shaped pipe connector (1102). Use a tension of 20KN-25KN to continuously tension the other end of the first steel bar (9). After holding for 10-20 minutes, the second steel bar will generate inward stress in the direction of the short side of the water-stabilized base. Then relax the prestressed tendon and use anchors to fix the other end of the second steel bar to another T-shaped pipe connector (1102). Inject hot-melt epoxy resin into the upward opening of the vertical pipe (12) until the opening of the vertical pipe (12) is sealed to obtain the prestressed second cement layer (13). S13: Asphalt is laid on the prestressed second cement layer (13) to form an asphalt layer (14). The asphalt layer (14) is then rolled flat by multiple road rollers until it is flush with the top opening of the vertical pipe (12).

2. The construction process for water-stabilized base course according to claim 1, characterized in that: In S6, when the first cement layer (8) is dried to a moisture content of 11-15%, multiple road rollers are used to statically compact the first cement layer (8) to a height of 2-3 cm above the upper surface of the first pre-embedded steel pipe (6). The distance between adjacent road rollers is 20-25 meters. The adjacent road rollers overlap by 60% of their wheel width during compaction. The compaction speed of the road rollers is 0.23 m / s to 0.33 m / s.

3. The construction process for water-stabilized base course according to claim 1, characterized in that: In S2, the thickness of the gravel layer (3) is 5-6 cm, and the particle diameter of the gravel layer (3) is 3-5 cm.

4. The construction process for water-stabilized base course according to claim 1, characterized in that: In S11, when the second cement layer (13) is dried to a moisture content of 7-8%, multiple road rollers are used to vibrate and flatten the second cement layer (13) to the middle position of the vertical pipe (12). The distance between adjacent road rollers is 15-20 meters. The adjacent road rollers overlap by 60% of the wheel width during compaction. The compaction speed of the road rollers is 0.20 meters per second to 0.30 meters per second.

5. The construction process for water-stabilized base course according to claim 1, characterized in that: In S6, S7, S11 and S12, when the internal moisture content of the first cement layer (8), the prestressed first cement layer (8), the second cement layer (13) and the prestressed second cement layer (13) is lower than the construction condition value, water is sprayed on the surface of the first cement layer (8), the prestressed first cement layer (8), the second cement layer (13) and the prestressed second cement layer (13), and the moisture content of the first cement layer (8), the prestressed first cement layer (8), the second cement layer (13) and the prestressed second cement layer (13) is retested after 20min-25min.

6. The construction process for water-stabilized base course according to claim 1, characterized in that: In step S12, the hot-melt epoxy resin passes through the vertical pipe (12), the T-shaped pipe connector (1102) and the L-shaped pipe in sequence, and fills the internal space of the first pre-embedded steel pipe (6) and the second pre-embedded steel pipe (11). After cooling for 1-2 days, the epoxy resin is cured inside the first pre-embedded steel pipe (6) and the second pre-embedded steel pipe (11).

7. A pavement structure formed by the water-stabilized base course construction process according to any one of claims 1-6, characterized in that: From top to bottom, the structure includes an asphalt layer (14), a second cement layer (13), a second metal mesh layer (10), a first cement layer (8), a first metal mesh layer (5), an epoxy resin layer (4), a gravel layer (3), and a soil layer (1). The first cement layer (8) has a first pre-embedded steel pipe (6) and a first metal mesh layer (5) arranged from top to bottom. The first metal mesh layer (5) has at least two rows. The second cement layer (13) has a second pre-embedded steel pipe (11) and a second metal mesh layer (10) arranged from top to bottom. The first pre-embedded steel pipe (6) matches the second pre-embedded steel pipe (11).

8. The pavement structure formed by the water-stabilized base course construction process according to claim 7, characterized in that: The first pre-embedded steel pipes (6) are parallel to each other and are distributed at equal intervals along the long side of the water-stabilized base.

9. The pavement structure formed by the water-stabilized base course construction process according to claim 7, characterized in that: The second pre-embedded steel pipes (11) are parallel to each other and are distributed at equal intervals along the short side of the water-stabilized base.

10. The pavement structure formed by the water-stabilized base course construction process according to claim 7, characterized in that: The soil layer (1) is provided with anchor piles (2). The anchor piles (2) include several sets of casting components (21) and anchor bars (22) embedded in the casting components (21). The casting components (21) are in the shape of an inverted "T". The casting components (21) include a root part embedded in the soil layer (1) and an anti-separation part that penetrates the gravel layer (3) and the epoxy resin layer (4). Anchor bars (22) that are inclined downward at 45° are set on the anti-separation part.

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