CN209854474U

CN209854474U - Highway composite foundation structure and highway structure

Info

Publication number: CN209854474U
Application number: CN201920523471.9U
Authority: CN
Inventors: 郑寒钊; 覃业强
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2019-12-27
Anticipated expiration: 2029-04-17

Abstract

A highway composite foundation structure comprises wing plates, a longitudinal foundation and arc-shaped connecting parts, wherein the wing plates are integrally formed by foam concrete, the wing plates are positioned at two ends of the highway composite foundation structure and are perpendicular to the longitudinal foundation, the longitudinal foundation is arranged along the driving direction in a width range where two peak values of each lane track transverse distribution frequency curve on a corresponding road surface are located, the wing plates and the longitudinal foundation are integrally connected by the arc-shaped connecting parts, the upper surfaces of the arc-shaped connecting parts are planes, and the lower surfaces of the arc-shaped connecting parts are arc surfaces; the highway foundation base structure is arranged at the approach transition section of the bridge and the highway; in the traveling direction, the embedding depth of the longitudinal foundation base is gradually reduced from the near bridge abutment end to the far bridge abutment end. Also discloses a road structure, which comprises the road composite foundation base structure, a cement stabilized gravel layer and an asphalt concrete layer. The utility model provides a soft soil foundation's bridgehead jumping and the problem of secondary jumping, provide technical guarantee for highway driving safety.

Description

Highway composite foundation structure and highway structure

Technical Field

The utility model belongs to the technical field of civil engineering, concretely relates to compound ground foundation structure of highway and highway structure.

Background

The phenomenon of vehicle jump at the bridge head is that the settlement of the bridge deck is small because the common pile foundation of the highway bridge supports the bridge, and the settlement of the embankment at the bridge head section of the soft soil roadbed is large, so that the settlement difference between the bridge deck and the road surface is formed, and the vehicle can jump when passing through. Meanwhile, when the problem of vehicle bump at the bridge head is solved, if the settlement difference at the bridge head is solved, a new settlement mutation can be generated at the joint of the roadbed processing section and the unprocessed section, namely, the so-called 'secondary vehicle bump' is generated. The 'vehicle bump at the bridge head' and the 'vehicle bump at the secondary' are two contradictory aspects, and the problem that the former causes the latter to be aggravated is solved.

The bump at the bridge head is one of the common diseases in the current highway bridge construction, and threatens the comfort and the safety of the vehicle in the driving process, and the bump occurs at a light rate, and the traffic accident which harms the lives and properties of drivers occurs at a heavy rate. Meanwhile, the bump at the bridge head not only shortens the service life of the vehicle, but also causes the fatigue damage of the bridge head road surface and even causes the adverse effect on the bridge culvert structure, thereby causing the increase of the later maintenance cost of the road. Particularly, in a section with a thick soft soil layer and a high underground water level, because a highway needs to fill a high fill embankment, sometimes because the construction period is tight, the filling time is relatively short, the foundation of a road and a bridge has great difference, and in addition, the foundation of a deep soft soil roadbed has a great difference settlement due to a series of reasons such as insufficient bearing capacity, poor stability, excessive settlement and the like, so that the problem of vehicle jump at the bridge head is caused.

Patent document CN201520512565 discloses a roadbed structure of a soft soil foundation highway bridge transition section, which is characterized in that pipes are embedded in a roadbed construction process, sand or soil is filled in the pipes, after a roadbed body is constructed, the sand or soil is transported out, and foam concrete is filled in the pipes, so that the effects of overload prepressing and foundation settlement reduction are achieved; the self weight of the roadbed is reduced, the accumulated settlement of the roadbed is reduced, the reinforcing treatment cost of the soft soil foundation is reduced, and the construction period is shortened. However, the construction process of the patent is complex, and the total cost is high.

Disclosure of Invention

An object of the utility model is to provide a compound foundation structure of highway and highway structure to solve the problem of the bridgehead car skip that provides among the background art.

In order to achieve the above object, the present invention provides a composite foundation structure for a road, the foundation structure including wing plates integrally formed by foam concrete, a longitudinal foundation and an arc-shaped connecting portion, the wing plates being located at both ends of the composite foundation structure, the wing plates being perpendicular to the longitudinal foundation, the longitudinal foundation being located within a width range where two peaks of each lane trace transverse distribution frequency curve are located on a corresponding road surface, and being disposed along a traveling direction, and a horizontal distance between a center of each longitudinal foundation and a center of a nearest lane boundary being 20-120 cm, the arc-shaped connecting portion connecting the wing plates and the longitudinal foundation into a whole, and an upper surface of the arc-shaped connecting portion being a plane and a lower surface thereof being an arc surface; the highway composite foundation structure is arranged at the approach transition section of the bridge and the highway; and in the traveling direction, the embedding depth of the longitudinal foundation base is gradually reduced from the near bridge abutment end to the far bridge abutment end. The wheel track transverse distribution frequency curve is a curve which is formed according to the distribution frequency by that when a vehicle runs on a road, the wheel tracks of wheels always swing left and right in a certain range near the center line of the cross section, are distributed on the cross section of a lane according to a certain frequency and are formed according to the distribution frequency.

Further, in the transverse direction perpendicular to the driving direction, the width range of each longitudinal foundation is 10-50 cm.

Furthermore, the thickness range of the wing plate in the vertical direction is 15-80 cm.

Further, in the transverse direction perpendicular to the driving direction, the width range of each cambered surface of the cambered connecting portion is 1.0-2.5 m.

Further, the horizontal distance between the center of each longitudinal foundation and the center of the nearest lane boundary is 65-100 cm.

Further, the lower surface of the arc-shaped connecting part is a convoluted linear arc surface or a cubic parabola-shaped arc surface.

The utility model also provides a highway structure, highway structure includes as before compound ground foundation structure of highway to and rubble layer and the asphalt concrete layer in the top are stabilized to the cement in compound ground foundation structure of highway top.

Further, the thickness of the cement stabilized macadam layer is 15-80 cm, and the thickness of the asphalt concrete layer is 5-20 cm.

Further, an asphalt surface layer made of pure asphalt is arranged between the cement stable gravel layer and the asphalt concrete layer.

Further, the maximum grain size of the aggregate of the asphalt concrete layer is gradually increased from the upper layer to the lower layer.

Compared with the prior art, the utility model discloses following beneficial effect has:

the rigidity and the structural shear resistance of the pavement structure are improved, and the aims of replacing the original bridge head butt strap design, reducing uneven settlement after construction at the joint of a road bridge, reducing solidification compression deformation of a roadbed, avoiding secondary vehicle jumping and improving the bearing capacity of the pavement structure are fulfilled; the foam concrete material ensures that the purposes of reducing the self weight of the structure, reducing the cost and reducing the construction difficulty are achieved under the condition that the structural strength is not greatly influenced. The problems of vehicle bump at the bridge head and vehicle bump for the second time under the condition of a soft soil foundation are effectively solved, and the technical guarantee is provided for the road driving safety in China.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic structural view of an embodiment of a road structure of the present invention;

FIG. 2 is a schematic diagram of a trace transverse distribution frequency curve;

wherein, 1, wing plate; 2. a longitudinal foundation base; 3. an arc-shaped connecting part; 4. a cement stabilized rubble layer; 5. an asphalt concrete layer; 21. a distal abutment end; 22. near the abutment end.

Detailed Description

The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.

Example 1

As shown in fig. 1, the utility model provides a pair of compound foundation structure of highway, foundation structure includes pterygoid lamina 1, vertical foundation 2 and the arc connecting portion 3 that are formed by the integration of foam concrete. The foam concrete is a light high-strength material with strong fluidity, small weight, good strength adjustment and good stability, and has more engineering application in the composite foundation of a building. The gravity of the foam concrete is generally 6kN/m³1/4, which is a common roadbed filling material, can effectively reduce the additional stress acting on the weak roadbed, thereby reducing the settlement of the soft soil foundation. And the compression modulus is large, the deformation resistance is strong, the compression resistance is good, and the compression deformation of the roadbed filling can be reduced. The foam concrete has good integrity, has no lateral acting force on a soil retaining structure, and can be vertically filled, thereby reducing the soil pressure effect on the abutment. The self-sealing property is good, vibration and rolling are not needed in construction, and foundation settlement caused by construction disturbance is small.

The wing plates 1 are located at the two transverse ends of the composite foundation structure and are perpendicular to the longitudinal foundation 2, the longitudinal foundation 2 is arranged in the width range where two peak values of each lane track transverse distribution frequency curve on the corresponding road surface are located and along the driving direction, and the horizontal distance between the center of each longitudinal foundation 2 and the center of the nearest lane boundary is 20-120 cm. The wheel track transverse distribution frequency curve is a curve which is formed according to the distribution frequency by that when a vehicle runs on a road, the wheel tracks of wheels always swing left and right in a certain range near the center line of the cross section, are distributed on the cross section of a lane according to a certain frequency and are formed according to the distribution frequency. The longitudinal foundation 2 is arranged in the width range of the traffic lane where two peak values of the track transverse distribution frequency curve are located, namely the maximum frequency drop point section of the automobile wheel, and mainly plays a role in bearing the automobile load. As shown in fig. 2, taking the width of a single 3.75m lane on the highway as an example: the distance between the road edge zone and the road edge zone is 0.75-1.0 m and 2.75-3.0 m, the frequency of the wheel tracks is the highest, and the longitudinal foundation width range is selected for the roads with other grades according to the frequency peak value width range of the transverse distribution of the wheel tracks of the roads with the same grade width.

The arc-shaped connecting part 3 connects the wing plate 1 and the longitudinal foundation 2 into a whole, the upper surface of the arc-shaped connecting part 3 is a plane, and the lower surface of the arc-shaped connecting part is an arc surface; the highway composite foundation structure is arranged at the approach transition section of the bridge and the highway; the depth of embedment of the longitudinal foundation 2 decreases from the near abutment end 22 to the far abutment end 21 in the direction of travel, thereby adjusting the rigidity of the road foundation structure.

Further, in the transverse direction perpendicular to the driving direction, the width range of each longitudinal foundation 2 is 10-50 cm. Taking the width of a single traffic lane of the expressway as an example of 3.75m, the width of the longitudinal foundation 2 is preferably 15-40 cm.

Further, the thickness range of the wing plate 1 in the vertical direction is 15-80 cm. Taking the width of a single traffic lane of the expressway as an example of 3.75m, the thickness of the wing plate 1 is preferably 20-65 cm.

Further, in the transverse direction perpendicular to the driving direction, the width range of each cambered surface of the cambered connecting portion 3 is 1.0-2.5 m. Taking the width of a single traffic lane of the expressway as an example of 3.75m, the width of the arc-shaped connecting part 3 is preferably 1.5-2.0 m. The cambered surface of the lower surface of the cambered connecting part adopts a smooth and smooth gentle curve line type.

The thickness of the wing plate, the width and radian of the arc-shaped connecting part, the width and embedding depth of the foundation are determined according to the actual engineering conditions.

Further, the horizontal distance between the center of each longitudinal foundation 2 and the center of the nearest lane boundary is 65-100 cm.

Further, the lower surface of the arc-shaped connecting part 3 is a convoluted linear arc surface or a cubic parabolic arc surface.

The utility model also provides a highway structure, highway structure includes as above the compound foundation structure of highway to and rubble layer 4 and asphalt concrete layer 5 in the top are stabilized to the cement in compound foundation structure of highway top.

Further, the thickness of the cement stabilized gravel layer 4 is 15-80 cm, and the thickness of the asphalt concrete layer 5 is 5-20 cm.

Further, an asphalt surface layer made of pure asphalt is arranged between the cement stabilized rubble layer 4 and the asphalt concrete layer 5. Mainly plays a role in water resistance.

Further, the maximum grain diameter of the aggregate of the asphalt concrete layer 5 is gradually increased from the upper layer to the lower layer.

The road surface component in the road structure adopts a general composition mode in the prior art.

The foregoing is a more detailed description of the invention, taken in conjunction with the specific preferred embodiments, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions and replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A highway composite foundation structure is characterized by comprising wing plates (1) integrally formed by foam concrete, longitudinal foundation foundations (2) and arc-shaped connecting parts (3), wherein the wing plates (1) are located at the two transverse ends of the composite foundation structure and are perpendicular to the longitudinal foundation foundations (2), the longitudinal foundation foundations (2) are arranged in the width range of two peak values of each lane track transverse distribution frequency curve on a corresponding road surface and are arranged along the driving direction, the horizontal distance between the center of each longitudinal foundation (2) and the center of the nearest lane boundary line is 20-120 cm, the arc-shaped connecting parts (3) connect the wing plates (1) and the longitudinal foundation (2) into a whole, the upper surfaces of the arc-shaped connecting parts (3) are planes, and the lower surfaces of the arc-shaped connecting parts are arc surfaces; the highway composite foundation structure is arranged at the approach transition section of the bridge and the highway; in the traveling direction, the embedding depth of the longitudinal foundation (2) is gradually reduced from the near bridge platform end (22) to the far bridge platform end (21).

2. A composite foundation footing structure for roads according to claim 1, characterized in that the width of each longitudinal foundation footing (2) in the transverse direction perpendicular to the traffic direction is in the range of 10-50 cm.

3. The composite foundation infrastructure for roads of claim 1, wherein the thickness of the wing plate (1) in the up-down direction is in the range of 15 to 80 cm.

4. A composite foundation footing structure for roads according to claim 1, wherein the width of each arc of the arc-shaped connection part (3) in the transverse direction perpendicular to the driving direction is in the range of 1.0-2.5 m.

5. A composite foundation infrastructure for a road according to claim 1, characterized in that the horizontal distance between the centre of each longitudinal foundation (2) and the centre of the closest roadway boundary is 65-100 cm.

6. A composite foundation base structure for roads according to any one of claims 1 to 5, wherein the lower surface of the arc-shaped connecting part (3) is a clothoid arc surface or a cubic parabola arc surface.

7. A road structure, characterized in that it comprises a composite foundation base structure for a road according to any one of claims 1-5, and a layer of cement stabilized rubble (4) and a layer of asphalt concrete (5) on top of the composite foundation base structure for a road.

8. The road structure of claim 7, wherein the cement stabilized macadam layer (4) has a thickness of 15-80 cm, and the asphalt concrete layer (5) has a thickness of 5-20 cm.

9. A road structure according to claim 7, characterized in that an asphalt surface layer made of pure asphalt is also arranged between the cement stabilized macadam layer (4) and the asphalt concrete layer (5).

10. A road structure according to claim 7, characterised in that the maximum grain size of the aggregate in the asphalt concrete layer (5) increases from the upper layer to the lower layer.