Road structure crossing deep water lake area

Abstract

The road structure penetrating through the deep water lake area comprises a riprap silt squeezing layer, a broken stone hardcore, a cantilever retaining wall, waterproof geotechnical cloth, a compacted soil layer, an improved soil layer, a lower base layer, a continuous reinforcement cement concrete upper base layer and a road surface layer which are sequentially arranged from bottom to top, and the cantilever retaining wall is composed of a vertical wall, a heel slab and a toe slab. The structure is characterized in that the continuously-reinforced cement concrete upper base layer is composed of concrete, and longitudinal steel bars and transverse steel bars which are poured in the concrete; the two ends of the transverse steel bars are connected with the embedded steel bars in the vertical walls of the two cantilever retaining walls. According to the road structure penetrating through the deep water lake area, the two ends of the transverse reinforcing steel bars are fixedly connected with the embedded reinforcing steel bars in the vertical wall to play a role of a buttress, compared with an existing buttress retaining wall, due to the fact that no buttress exists, a large road roller can be used for compacting a base layer, roadbed quality can be guaranteed, road construction is facilitated, and the road structure is suitable for being popularized and applied. The construction progress is accelerated, and the construction cost is saved.

Description

Technical Field

[0001] The utility model relates to a road structure, and more specifically, to a road structure for crossing a deep-water lake area. Background Art

[0002] Under the background of the rapid economic development in our country, the construction of the transportation road network is becoming more and more intensive, and correspondingly, there are more and more highways crossing scenic lakes. During the construction of existing highways crossing scenic lakes, especially for deep-water lake areas, it is necessary to fill a relatively high roadbed (usually more than 6 meters), and a counterfort retaining wall is usually used to enclose the roadbed; however, when filling soil on the inner side of the counterfort retaining wall during construction, due to the existence of the counterfort, large rollers cannot approach the area near the vertical wall of the cantilever retaining wall for compaction, and small equipment is difficult to achieve qualified compaction due to its small power, resulting in insufficient compaction of the laid roadbed, and thus affecting the quality of the constructed road. Therefore, there is an urgent need to invent an economic, practical road structure that can meet the requirements of crossing deep-water lakes. Summary of the Invention

[0003] The utility model aims to overcome the above-mentioned technical problems and provides a road structure for crossing a deep-water lake area.

[0004] The road structure for crossing a deep-water lake area of the utility model includes a stone-filled silt compaction layer, a crushed stone cushion layer, a cantilever retaining wall, a waterproof geotextile, a compacted soil layer, an improved soil layer, a lower base course, a continuously reinforced cement concrete upper base course, and a road surface layer, which are arranged in sequence from bottom to top. Cantilever retaining walls are arranged on both sides of the upper part of the crushed stone cushion layer. The cantilever retaining wall consists of a vertical wall, a heel slab, and a toe slab. The compacted soil layer, the improved soil layer, the lower base course, and the continuously reinforced cement concrete upper base course are arranged between the vertical walls of the two cantilever retaining walls, and embedded steel bars are arranged in the vertical walls; it is characterized in that: the continuously reinforced cement concrete upper base course is composed of concrete and longitudinal steel bars and transverse steel bars cast therein. The longitudinal steel bars are along the road driving direction, and the transverse steel bars are along the road width direction; both ends of the transverse steel bars are connected to the embedded steel bars in the vertical walls of the two cantilever retaining walls.

[0005] In the road structure for crossing a deep-water lake area of the utility model, a temperature joint is arranged at a position 10 cm - 15 cm away from the vertical wall in the continuously reinforced cement concrete upper base course. The length direction of the temperature joint is consistent with the road driving direction. The width of the temperature joint is 2 cm - 3 cm, and the height is 25 cm - 28 cm. Hot asphalt is poured into the temperature joint.

[0006] In the road structure for crossing a deep-water lake area of the utility model, the width of each side of the stone-filled silt compaction layer is 3 m wider than that of the cantilever retaining wall; the thickness of the crushed stone cushion layer is 30 cm - 50 cm, and the width of the crushed stone cushion layer is equal to that of the stone-filled silt compaction layer.

[0007] The road structure for crossing deep - water lake areas of the present utility model, pre - embedded steel bars are arranged on the inner side of the vertical wall of the cantilever retaining wall, and the model of the pre - embedded steel bars is the same as that of the transverse steel bars. The cantilever retaining wall is of reinforced concrete structure.

[0008] The road structure for crossing deep - water lake areas of the present utility model, the waterproof geotextile is two - layer, and the permeability coefficient k of the waterproof geotextile is less than 10 -13 cm / s.

[0009] The road structure for crossing deep - water lake areas of the present utility model, the compacted soil layer is composed of multiple layers of compacted soil, the thickness of each layer of compacted soil does not exceed 20 cm, and the compaction degree is not less than 93%.

[0010] The road structure for crossing deep - water lake areas of the present utility model, the improved soil layer is three - layer improved soil doped with cement, and the thickness of each layer of improved soil is 20 cm; the lower base layer uses semi - rigid materials, and the 7 - day compressive strength after the lower base layer is laid is 2.5 MPa - 4.0 MPa.

[0011] The road structure for crossing deep - water lake areas of the present utility model, the thickness of the continuously reinforced cement concrete upper base layer is 25 cm - 28 cm, the longitudinal steel bars are arranged at a position 8 cm - 10 cm away from the top surface of the continuously reinforced cement concrete upper base layer, the transverse steel bars are arranged above the longitudinal steel bars, and the grade of the concrete is 30 MPa - 35 MPa.

[0012] The road structure for crossing deep - water lake areas of the present utility model, the road surface layer is an asphalt surface layer, and the thickness of the road surface layer is 8 cm - 15 cm.

[0013] The road structure for crossing deep - water lake areas of the present utility model, a settlement joint is arranged every 15 m - 20 m.

[0014] The beneficial effects of the present utility model are as follows: The road structure for crossing a deep-water lake area of the present utility model is composed of a stone-filled silt compaction layer, a crushed stone cushion layer, a cantilever retaining wall, a waterproof geotextile, a compacted soil layer, an improved soil layer, a lower base course, a continuously reinforced cement concrete upper base course, and a road surface course, which are arranged in sequence from bottom to top. The stone-filled silt compaction layer and the crushed stone cushion layer are beneficial for laying a road foundation with better bearing performance in the deep-water lake area, which is conducive to the subsequent pouring of the cantilever retaining wall and the laying of each functional layer. Moreover, both ends of the transverse steel bars in the continuously reinforced cement concrete upper base course are fixedly connected to the embedded steel bars in the vertical wall of the cantilever retaining wall. In this way, the continuously reinforced cement concrete upper base course not only functions as a base course but also as a buttress, achieving the blocking of the compacted soil layer, the improved soil layer, and the lower base course between the two vertical walls. Compared with the existing use of buttress retaining walls, due to the absence of buttresses, a large roller can be used to compact the compacted soil layer, the improved soil layer, and the lower base course, which is conducive to ensuring the quality of the roadbed, greatly simplifies the structure, facilitates road construction, speeds up the construction progress, and saves the project cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view of the road structure for crossing a deep-water lake area of the present utility model;

[0016] Figure 2 is the top view of the road structure for crossing a deep-water lake area of the present utility model.

[0017] In the figure: 1 stone-filled silt compaction layer, 2 crushed stone cushion layer, 3 cantilever retaining wall, 4 compacted soil layer, 5 improved soil layer, 6 lower base course, 7 continuously reinforced cement concrete upper base course, 8 road surface course, 9 guardrail, 10 longitudinal steel bars, 11 transverse steel bars, 12 concrete, 13 temperature joint, 14 settlement joint, 15 waterproof geotextile, 16 vertical wall, 17 heel slab, 18 toe slab. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0019] As Figure 1 and Figure 2As shown, the front view and top view of the road structure for crossing a deep - water lake area of the present utility model are given. The road structure for crossing the deep - water lake area is composed of a stone - filled silt compaction layer 1, a crushed - stone cushion layer 2, a cantilever retaining wall 3, a waterproof geotextile 15, a compacted soil layer 4, an improved soil layer 5, a lower base course 6, a continuously reinforced cement concrete upper base course 7, and a road surface layer 8, which are arranged successively from bottom to top. The stone - filled silt compaction layer 1 is composed of large - volume stones thrown into the deep - water lake area, and the crushed - stone cushion layer 2 is laid on the stone - filled silt compaction layer 1. On both sides above the shown crushed - stone cushion layer 2, there are cantilever retaining walls 3. The cantilever retaining wall 3 is composed of a vertical wall 16, a heel slab 17, and a toe slab 18, and is a reinforced concrete structure. The toe slab 18 and the heel slab 17 are horizontally arranged on the crushed - stone cushion layer 2, and the vertical wall 16 is fixed in a vertical state on the heel slab 17 and the toe slab 18. The heel slab 17 faces inwards, and the toe slab 18 faces outwards. Embedded steel bars are arranged in the vertical wall 16.

[0020] The shown waterproof geotextile 15 is laid above the heel slab 17 and the toe slab 18 to prevent moisture from seeping upwards. The compacted soil layer 4, the improved soil layer 5, the lower base course 6, the continuously reinforced cement concrete upper base course 7, and the road surface layer 8 are arranged between the vertical walls 16 of the two cantilever retaining walls 3. The compacted soil layer 4 is laid on the waterproof geotextile 15, the improved soil layer 5 is laid above the compacted soil layer 4, the lower base course 6 is laid on the improved soil layer 5, the continuously reinforced cement concrete upper base course 7 is laid on the lower base course 6, and the road surface layer 8 is laid on the continuously reinforced cement concrete upper base course 7.

[0021] The shown continuously reinforced cement concrete base course 7 is composed of concrete 12 and longitudinal steel bars 10 and transverse steel bars 11 cast in the concrete 12. The length directions of the longitudinal steel bars 10 and the transverse steel bars 11 are respectively consistent with the road driving direction and the road width direction. The longitudinal steel bars 10 are evenly spaced along the road width direction, and the transverse steel bars 11 are evenly spaced along the road driving direction. Moreover, the two ends of the transverse steel bars 11 are connected to the embedded steel bars in the two vertical walls 16. In this way, the continuously reinforced cement concrete base course 7 not only functions as a road base course but also, through the pulling and positioning of the two side vertical walls 16, functions as a buttress for the vertical walls 16.

[0022] At the same time, since in the road structure for crossing the deep - water lake area of the present utility model, a cantilever retaining wall 3 is adopted instead of a buttress retaining wall, there is no buttress. Therefore, during the process of laying the compacted soil layer 4, the improved soil layer 5, and the lower base course 6, a large - scale roller can be used for compaction operations, ensuring the stability of the road foundation and being beneficial to ensuring that the constructed road structure meets the design life requirements.

[0023] To cope with the thermal expansion and contraction of the continuously reinforced cement concrete upper base layer 7 caused by temperature changes, temperature joints 13 are provided on both sides of the continuously reinforced cement concrete upper base layer 7 near the vertical wall 16. The temperature joints 13 are provided at a position 10 cm to 15 cm away from the vertical wall. The transverse steel bars 11 arranged inside the temperature joints 13 are uninterrupted. The length direction of the temperature joints 13 is consistent with the road driving direction. The width of the temperature joints 13 can be designed to be 2 cm to 3 cm, and the height is equal to the thickness of the continuously reinforced cement concrete upper base layer 7, such as 25 cm to 28 cm. Hot asphalt is poured into the temperature joints 13.

[0024] Affected by the fact that the settlement performances of different sections in the deep water lake area may be inconsistent, a settlement joint 14 is provided every 15 m to 20 m for the road structure passing through the deep water lake area of the present utility model. A guardrail 9 is fixed above the vertical wall 16 shown.

[0025] To ensure the stability of the road structure built passing through the deep water lake area, the width of the stone-filled silt layer 1 is 3 m wider than that of the cantilever retaining wall 3 on each side. The thickness of the crushed stone cushion layer 2 is 30 cm to 50 cm, and the width of the crushed stone cushion layer 2 is equal to the width of the stone-filled silt layer 1. The waterproof geotextile 15 is two layers, and the permeability coefficient k of the waterproof geotextile is less than 10 -13 cm / s.

[0026] The compacted soil layer 4 shown is composed of multiple layers of compacted soil, and the thickness of each layer of compacted soil does not exceed 20 cm, and the compaction degree is not less than 93%. The improved soil layer 5 is improved soil doped with cement in three layers, and the thickness of each layer of improved soil is 20 cm; the lower base layer 6 uses semi-rigid materials, and the 7-day compressive strength after the lower base layer 6 is laid is 2.5 MPa to 4.0 MPa.

[0027] The thickness of the continuously reinforced cement concrete upper base layer 7 shown is 25 cm to 28 cm. The longitudinal steel bars 10 are arranged at a position 8 cm to 10 cm away from the top surface of the continuously reinforced cement concrete upper base layer 7. The transverse steel bars 11 are arranged above the longitudinal steel bars 10. The grade of the concrete 12 is 30 MPa to 35 MPa. The road surface layer 8 is an asphalt surface layer, and the thickness of the road surface layer is 8 cm to 15 cm. Embedded steel bars are provided on the inner side of the vertical wall 16 of the cantilever retaining wall 3, and the model of the embedded steel bars is the same as that of the transverse steel bars 11.

Claims

1. A road structure for crossing a deep-water lake area, comprising a stone-filled silt compaction layer (1), a crushed stone cushion layer (2), a cantilever retaining wall (3), a waterproof geotextile (15), a compacted soil layer (4), an improved soil layer (5), a lower base layer (6), a continuously reinforced cement concrete upper base layer (7) and a road surface layer (8) arranged in sequence from bottom to top. Cantilever retaining walls are arranged on both sides of the upper part of the crushed stone cushion layer. The cantilever retaining wall is composed of a vertical wall (16), a heel slab (17) and a toe slab (18). The compacted soil layer, the improved soil layer, the lower base layer and the continuously reinforced cement concrete upper base layer are arranged between the vertical walls of the two cantilever retaining walls, and embedded steel bars are arranged in the vertical walls; it is characterized in that: The continuous reinforced cement concrete upper base course is composed of concrete (12) and longitudinal reinforcement bars (10) and transverse reinforcement bars (11) cast therein. The longitudinal reinforcement bars are along the driving direction of the road, and the transverse reinforcement bars are along the width direction of the road; both ends of the transverse reinforcement bars are connected to the embedded reinforcement bars in the vertical walls of the two cantilever retaining walls.

2. The road structure for crossing a deep water lake area according to claim 1, wherein: A temperature joint (13) is provided at a position 10 cm to 15 cm away from the vertical wall (16) in the continuous reinforced cement concrete upper base course (7). The length direction of the temperature joint is consistent with the driving direction of the road. The width of the temperature joint is 2 cm to 3 cm, and the height is 25 cm to 28 cm. Hot asphalt is poured into the temperature joint.

3. The road structure for crossing a deep water lake area according to claim 1 or 2, characterized in that: The width of the stone-filled silt layer (1) is 3 m wider than that of the cantilever retaining wall (3) on each side; the thickness of the gravel cushion layer (2) is 30 cm to 50 cm, and the width of the gravel cushion layer is equal to that of the stone-filled silt layer.

4. The road structure for crossing a deep water lake area according to claim 1 or 2, characterized in that: Embedded reinforcement bars are provided on the inner side of the vertical wall (16) of the cantilever retaining wall (3). The type of the embedded reinforcement bars is the same as that of the transverse reinforcement bars (11). The cantilever retaining wall is of a reinforced concrete structure.

5. The road structure for crossing a deep water lake area according to claim 1 or 2, characterized in that: The waterproof geotextile (15) has two layers, and the permeability coefficient k of the waterproof geotextile is less than 10 -13 cm / s.

6. The road structure for crossing a deep water lake area according to claim 1 or 2, characterized in that: The compacted soil layer (4) is composed of multiple layers of compacted soil. The thickness of each layer of compacted soil does not exceed 20 cm, and the compaction degree is not less than 93%.

7. The road structure for crossing a deep water lake area according to claim 1 or 2, characterized in that: The improved soil layer (5) is three layers of improved soil doped with cement, and the thickness of each layer of improved soil is 20 cm; the lower base course (6) uses semi-rigid materials, and the 7-day compressive strength after the lower base course is laid is 2.5 MPa to 4.0 MPa.

8. The road structure for crossing a deep water lake area according to claim 1 or 2, characterized in that: The thickness of the continuous reinforced cement concrete upper base course (7) is 25 cm to 28 cm. The longitudinal reinforcement bars (10) are arranged at a position 8 cm to 10 cm away from the top surface of the continuous reinforced cement concrete upper base course. The transverse reinforcement bars (11) are arranged above the longitudinal reinforcement bars. The grade of the concrete (12) is 30 MPa to 35 MPa.

9. The road structure for crossing a deep water lake area according to claim 1 or 2, characterized in that: The road surface course (8) is an asphalt surface course, and the thickness of the road surface course is 8 cm to 15 cm.

10. The road structure for crossing a deep water lake area according to claim 1 or 2, characterized in that: A settlement joint (14) is provided every 15 m to 20 m.

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