Cantilever beam structured roadbed

Abstract

The utility model relates to a cantilever beam structured roadbed which comprises a plurality of roadbed units which can be sequentially arranged in the longitudinal direction of the top of a slope. Each roadbed unit comprises a pile foundation and a beam plate. The beam plate is of a cast-in-place concrete structure which is laid on the top of the slope and extends out of the slope. The pile foundation is vertically inserted into the side slope, the bottom of the pile foundation is located in bed rock below the side slope, and the top of the pile foundation is connected with the beam plate. The construction method has the beneficial effects that transportation and construction are convenient, transverse creepage of the beam slab relative to the pile foundation is avoided, transverse differential settlement of a road is avoided, the construction difficulty is reduced, and the stability of a side slope is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of roadbed, in particular to a cantilever beam structured roadbed. Background Art

[0002] In highway structures, the roadbed is the fundamental structure and the foundation that supports the pavement structure. Its main function is to provide the necessary conditions for pavement paving and vehicle operation, bear the dead load of the pavement structure and the live load of vehicles, and transmit and diffuse the load deep into the foundation.

[0003] To address the challenges of roadbed construction on steep slopes in mountainous areas, prefabricated pile-slab structures are commonly used. A common approach involves inserting prefabricated driven piles or bored cast-in-place piles into the slope up to the bearing layer. Prefabricated beams and slabs are then installed in the suspended section at the top of the slope. These beams and slabs are supported on top of the piles, forming a cantilever beam structure. However, this technology still presents the following challenges:

[0004] (1) Steep slope roads in mountainous areas are usually curved, making it difficult to transport and construct large prefabricated beams and slabs.

[0005] (2) Since the beam-slab is located only in the suspended section at the top of the slope, the structures of the road surface at the top of the slope and the beam-slab in the suspended section are different. The settlement coefficients of the two sections after being loaded by vehicles are different, which easily leads to uneven settlement in the transverse direction of the road. The beam-slab located in the suspended section at the top of the slope will also increase the load at the top of the slope, which will have an adverse effect on the stability of the slope.

[0006] (3) The beam and slab are placed directly on the top of the pile. The two are flexibly connected and lack lateral constraints. Under the action of the centrifugal force of the vehicle, the beam and slab are easily driven to creep laterally relative to the pile. Utility Model Content

[0007] (1) Technical issues to be resolved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a cantilever beam structured roadbed, which solves the technical problems that the traditional cantilever beam structured roadbed is inconvenient for transportation and construction, is not conducive to the stability of the slope, and has caused lateral creep of the beam and slab relative to the pile.

[0009] (2) Technical solution

[0010] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0011] The embodiment of the utility model provides a cantilever beam structured roadbed, comprising a plurality of roadbed units, wherein the plurality of roadbed units can be sequentially arranged along the longitudinal direction of the top of the slope;

[0012] Each of the roadbed units includes a pile foundation and a beam slab;

[0013] The beam slab is a cast-in-place concrete structure laid on the top of the slope and extending to the outside of the slope;

[0014] The pile foundation is vertically inserted into the slope, the bottom of the pile foundation is located in the bedrock below the slope, and the top of the pile foundation is connected to the beam plate.

[0015] According to the present utility model, each of the roadbed units further includes a template;

[0016] The template has a grouting cavity with an upper opening, and a socket is provided at the bottom of the template;

[0017] When the pile foundation is inserted into the slope, the template can be set up on the top of the slope and the insertion hole can be inserted into the top of the pile foundation, the cast-in-situ concrete in the grouting cavity forms the beam plate and the bottom of the beam plate is connected to the top of the pile foundation.

[0018] According to the utility model, connected pile foundation holes can be dug on the slope and the bedrock, and the pile foundation is a cast-in-place reinforced concrete structure arranged in the pile foundation hole;

[0019] The number of pile foundations provided in each of the roadbed units is at least one group;

[0020] Each group of pile foundations includes at least two pile foundations, and the at least two pile foundations are arranged at intervals along the lateral direction of the top of the slope, and the total depth of each pile foundation inserted into the slope and the bedrock is the same;

[0021] When the pile foundations are provided in multiple groups, the pile foundations are arranged at intervals along the longitudinal direction of the top of the slope.

[0022] According to the present invention, the bottom of the beam plate protrudes downward to form a support seat for connecting to the pile foundation;

[0023] The thickness of the beam plate is 1.0-1.2m;

[0024] The thickness of the support base is 1.8-2.0m.

[0025] According to the utility model, a steel sleeve is provided on the portion of the pile foundation located on the slope, and the steel sleeve is located inside the slope.

[0026] According to the present invention, the top surface and bottom surface of the beam plate are arranged in parallel;

[0027] A pavement structure is laid on top of the beams and slabs in the plurality of roadbed units, and the pavement structure can form a smooth road surface;

[0028] When the longitudinal gradient of the top of the side slope is greater than or equal to 4%, the beams and slabs in two adjacent roadbed units are staggered and the longitudinal gradients of the beams and slabs are both greater than or equal to 4%.

[0029] According to the present invention, when the roadbed unit is arranged on the curved section of the slope, the outer side of the top of the pavement structure is higher than the inner side in the transverse direction;

[0030] When the roadbed unit is arranged on a straight section of the slope, the middle of the top of the pavement structure is higher than both sides in the transverse direction.

[0031] According to the present utility model, the pavement structure includes an LC20 lightweight concrete layer.

[0032] According to the utility model, the pavement structure further comprises a waterproof coiled material, a cement-stabilized crushed stone base layer and an asphalt concrete pavement layer;

[0033] The waterproof membrane, the LC20 lightweight concrete layer, the cement-stabilized macadam base layer and the asphalt concrete pavement layer are arranged in sequence from bottom to top;

[0034] The total thickness of the pavement structure is not greater than 1m.

[0035] According to the utility model, a floor covering extending in the longitudinal direction is provided on the transverse outer side of the beam plate;

[0036] A railing or guardrail is arranged on the top of the floor covering.

[0037] (3) Beneficial effects

[0038] The cantilever beam structured roadbed provided by the utility model has the following beneficial effects:

[0039] Easy to transport and construct: Since the beams and slabs are cast-in-place concrete structures constructed on site, there is no need to transport large prefabricated beams and slabs, which is suitable for roadbed construction on steep slopes in mountainous areas.

[0040] Prevent lateral creep of beams and slabs relative to pile foundations: The beams and slabs formed by cast-in-place concrete can connect to the tops of pile foundations. The connection strength between the beams and slabs and the pile foundations is relatively high, which effectively prevents the centrifugal force generated when vehicles travel on the formed roadbed from causing the beams and slabs to creep horizontally relative to the pile foundations.

[0041] Avoiding uneven lateral settlement of the road: Since the beams and slabs are laid on the top of the slope and extend to the outside of the slope, the consistency of the structure is ensured to avoid uneven lateral settlement of the road.

[0042] Reduce construction difficulty and ensure slope stability: The bottom of the pile foundation is located in the bedrock below the slope. The dead load and vehicle live load borne by the roadbed can be transmitted to the bedrock through the beams and pile foundations, avoiding slope collapse caused by slope load, thus ensuring the stability of the slope. At the same time, this roadbed is formed by arranging multiple roadbed units in sequence along the longitudinal direction of the top of the slope. During construction, the location of each unit can be flexibly determined according to the actual terrain and on-site conditions, and the location of the pile foundation can be flexibly determined to adjust the span value, that is, the distance between adjacent pile foundations in the longitudinal direction of the road. It can also make the formed roadbed highly consistent with the existing road line shape to reduce construction difficulty. At the same time, during construction, the position of the pile foundation can be flexibly adjusted to avoid the anchor rods inserted in the slope by the anchor rod frame beam slope protection, so as to avoid the anchor rods being damaged by the pile foundation construction, effectively avoiding adverse effects on the stability of the slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of traditional cantilever beam structured roadbed;

[0044] Figure 2 Schematic diagram of the cantilever beam structured roadbed of the present invention;

[0045] Figure 3 Figure 2 A partial schematic diagram of

[0046] Figure 4 for Figure 3 A magnified schematic diagram of point A;

[0047] Figure 5 This is a schematic diagram of the connection between beam-slab and pile foundation;

[0048] Figure 6 Schematic diagram of the cantilever beam structured roadbed of the present invention;

[0049] Figure 7 This is a schematic diagram of the cantilever beam structured roadbed of the present invention at the anchor frame beam slope protection.

[0050] [Description of Reference Numerals]

[0051] 1: roadbed unit; 11: pile foundation; 12: beam and slab; 121: support base; 14: pavement structure; 141: waterproof membrane; 142: lightweight concrete layer; 143: crushed stone base; 144: asphalt concrete pavement layer; 15: ground cover;

[0052] 2: Slope;

[0053] 3: bedrock;

[0054] 4: Anchor rod;

[0055] 5: Original road surface. DETAILED DESCRIPTION

[0056] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments. Figure 6 The orientation of the reference is the "vertical" reference Figure 2 The direction in which the multiple roadbed units 1 extend, "lateral" refers to Figure 6 The extension direction of the center beam 12.

[0057] See also Figure 1-7 The cantilever beam structured roadbed proposed in an embodiment of the present invention includes a plurality of roadbed units 1 , and the plurality of roadbed units 1 can be arranged in sequence along the longitudinal direction of the top of the slope 2 .

[0058] Each roadbed unit 1 consists of pile foundations 11 and beam-slab 12. The beam-slab 12 is a cast-in-place concrete structure laid on top of the slope 2. The pile foundations 11 are vertically inserted into the slope 2, with the bottom of the pile foundations 11 located in the bedrock 3 below the slope 2, and the top of the pile foundations 11 connected to the beam-slab 12.

[0059] The cantilever beam structured roadbed has the following beneficial effects:

[0060] Easy to transport and construct: Since the beam slab 12 is a cast-in-place concrete structure constructed on site, there is no need to transport large prefabricated beam slabs, and it is suitable for roadbed construction on steep slopes in mountainous areas.

[0061] Prevent the beam slab 12 from creeping laterally relative to the pile foundation 11: The beam slab 12 formed by cast-in-place concrete can be connected to the top of the pile foundation 11. The connection strength between the beam slab 12 and the pile foundation 11 is relatively large, which effectively prevents the centrifugal force generated when the vehicle travels on the formed roadbed from causing the beam slab 12 to creep laterally relative to the pile foundation 11.

[0062] Avoiding uneven transverse settlement of the road: Since the beam slab 12 is laid on the top of the slope 2 and extends to the outside of the slope 2, the consistency of the structure is ensured to avoid uneven transverse settlement of the road.

[0063] Reduce construction difficulty and ensure slope stability: The bottom of the pile foundation 11 is located in the bedrock 3 below the slope 2. The dead load and vehicle live load borne by the roadbed can be transmitted to the bedrock 3 by the beam slab 12 and pile foundation 11, preventing the slope 2 from collapsing due to the load, thereby ensuring the stability of the slope 2. At the same time, this roadbed is formed by arranging multiple roadbed units 1 in sequence along the longitudinal direction of the top of the slope 2. During construction, the location of each unit can be flexibly determined based on the actual terrain and on-site conditions, and the location of the pile foundation 11 can be flexibly determined to adjust the span value, that is, the spacing between adjacent pile foundations 11 in the longitudinal direction of the road. The formed roadbed can also be made highly consistent with the existing road line shape, thereby reducing construction difficulty. At the same time, during construction, the position of the pile foundation 11 can be flexibly adjusted to avoid the anchor rods inserted into the slope 2 using the anchor rod frame beam slope protection, preventing the construction of the pile foundation 11 from damaging the anchor rods, effectively avoiding adverse effects on the stability of the slope 2.

[0064] Furthermore, each roadbed unit 1 also includes a template.

[0065] The template is provided with a grouting cavity with an upper opening, and a socket is provided at the bottom of the template.

[0066] When the pile foundation 11 is inserted into the slope 2, the template can be set up on the top of the slope 2 and the insertion hole can be inserted into the top of the pile foundation 11. The cast-in-place concrete in the grouting cavity forms the beam slab 12, and the bottom of the beam slab 12 is connected to the top of the pile foundation 11. In this way, the beam slab 12 can be cast on site conveniently and quickly.

[0067] Furthermore, the bottom of the beam slab 12 protrudes downward to form a support seat 121 for connecting to the pile foundation 11, so as to increase the thickness of the support point at the connection with the pile foundation 11, thereby improving the vertical bearing capacity of the pile foundation 11. At the same time, it can also reduce the live load deflection of the cantilever end of the beam slab 12 extending out from the top of the slope 2, thereby avoiding the misalignment of the beam slabs 12 in two adjacent roadbed units 1.

[0068] Preferably, the thickness of the beam plate 12 is 1.0-1.2 m, and the thickness of the support base 121 is 1.8-2.0 m, so as to save material costs while ensuring strength.

[0069] Furthermore, a floor covering 15 extending longitudinally is provided on the transverse outer side of the beam slab 12. A handrail or guardrail is provided on the top of the floor covering 15.

[0070] Since the outer side of the beam slab 12 is close to the mountain in the transverse direction, there is no need to set up railings or guardrails for protection.

[0071] Furthermore, the top surface and bottom surface of the beam plate 12 are arranged in parallel.

[0072] A pavement structure 14 is laid on top of the beams and slabs 12 in the plurality of roadbed units 1 , and the pavement structure 14 can form a smooth road surface.

[0073] When the longitudinal slope of the top of the slope 2 is greater than or equal to 4%, the beams and slabs 12 in the two adjacent roadbed units 1 are staggered and the longitudinal slope of the beams and slabs 12 is greater than or equal to 4% to avoid the longitudinal slope of the beams and slabs 12 being too large, which may cause the pavement structure 14 laid thereon to slip, thereby improving the stability of the pavement structure 14.

[0074] Specifically, when the roadbed unit 1 is set on a curved section of the slope 2, the outer side of the top of the pavement structure 14 is higher than the inner side in the transverse direction to offset the transverse outward centrifugal force applied to the pavement structure 14 when the vehicle travels along the curved road.

[0075] When the roadbed unit 1 is arranged on a straight section of the side slope 2, the middle of the top of the pavement structure 14 is higher than the two sides in the transverse direction, so as to drain rainwater to both sides.

[0076] Furthermore, the pavement structure 14 includes an LC20 lightweight concrete layer 142 to effectively diffuse the vehicle wheel load and reduce the deflection of the cantilever end of the beam slab 12 extending from the top of the slope 2. Its light weight can significantly reduce its own internal force of the dead load, and has low support strength requirements for the pile foundation 11, which can reduce the number of steel bars configured in the pile foundation 11 and reduce the cost of roadbed construction.

[0077] Furthermore, the pavement structure 14 also includes a waterproof membrane 141 , a cement-stabilized gravel base layer 143 and an asphalt concrete pavement layer 144 .

[0078] The waterproof membrane 141, the LC20 lightweight concrete layer 142, the cement-stabilized crushed stone base layer 143 and the asphalt concrete pavement layer 144 are arranged in sequence from bottom to top.

[0079] The waterproofing membrane 141 is used to resist rainwater from the outside and prevent groundwater from leaking, while the cement-stabilized gravel base 143 is used to enhance the load-bearing capacity, anti-seepage and anti-cracking capabilities of the road surface.

[0080] Preferably, the waterproof membrane 141 is an SBS waterproof membrane.

[0081] Preferably, the total thickness of the pavement structure 14 is no more than 1 m, so as to save material costs while ensuring the strength of the pavement structure 14 .

[0082] Furthermore, connected pile foundation holes can be dug on the slope 2 and the bedrock 3 , and the pile foundation 11 is a cast-in-situ reinforced concrete structure arranged in the pile foundation hole.

[0083] During construction, pile foundation holes are first dug on the slope 2 and bedrock 3 according to the terrain and site conditions, and then the steel cage is inserted into the pile foundation holes. Subsequently, concrete is poured into the pile foundation holes to form a cast-in-place reinforced concrete structure.

[0084] Furthermore, the number of pile foundations 11 provided in each roadbed unit 1 is at least one group.

[0085] Each group of pile foundations 11 includes at least two pile foundations 11, which are spaced laterally along the top of the slope 2. This increases the support strength of the beam slab 12. Furthermore, each pile foundation 11 is inserted into the slope 2 and bedrock 3 to a consistent total depth, ensuring consistent support strength across each pile foundation 11 within each group.

[0086] When multiple groups of pile foundations 11 are provided, the groups are spaced longitudinally along the top of the slope 2. During construction, the number of groups of pile foundations 11 in each roadbed unit 1, i.e., the span or longitudinal spacing between the pile foundations 11 of adjacent roadbed units 1, can be flexibly determined based on the actual terrain and site conditions, to optimize the arrangement of pile positions and reduce construction difficulty.

[0087] Preferably, the number of pile foundations 11 in each roadbed unit 1 is one or two groups, so as to be applicable to most terrains.

[0088] Furthermore, a steel sleeve is provided on the portion of the pile foundation 11 located on the slope 2 , and the steel sleeve is located inside the slope 2 .

[0089] When the roadbed is at the bottom of a steep slope or in a poor geological area, a steel sleeve is installed on the part of the pile foundation 11 located on the slope 2 so that the load borne by the pile foundation 11 can be fully transmitted to the bedrock 3 instead of acting on the slope 2, thereby avoiding adverse effects on the stability of the slope 2.

[0090] During construction, after the pile foundation holes are dug on the slope 2 and the bedrock 3, the steel cage is inserted into the pile foundation holes and the steel sleeve is inserted into the pile foundation holes on the slope 2 part. Then, concrete is poured into the pile foundation holes to form the pile foundation 11.

[0091] Furthermore, the construction method of the cantilever beam structured roadbed is as follows:

[0092] S1. First, pile foundation holes are dug on the slope 2 and the bedrock 3, and then a steel cage is inserted into the pile foundation holes. Subsequently, concrete is poured into the pile foundation holes to form a pile foundation 11.

[0093] S2, the template is set up on the top of the slope 2 and extended to the outside of the slope 2, and the socket of the template is inserted into the top of the pile foundation 11. Subsequently, the cast-in-place concrete in the grouting cavity forms a beam slab 12, and the bottom of the beam slab 12 connects the top of the pile foundation 11.

[0094] S3. Laying the pavement structure 14 layer by layer on top of the beams and slabs 12 of the multiple roadbed units 1.

[0095] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0096] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0097] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A cantilever beam structured roadbed, characterized in that: It comprises a plurality of roadbed units (1), wherein the plurality of roadbed units (1) can be arranged in sequence along the longitudinal direction of the top of the slope (2); Each of the roadbed units (1) comprises a pile foundation (11) and a beam slab (12); The beam plate (12) is a cast-in-place concrete structure laid on the top of the slope (2) and extending to the outside of the slope (2); The pile foundation (11) is vertically inserted into the slope (2), the bottom of the pile foundation (11) is located in the bedrock (3) below the slope (2), and the top of the pile foundation (11) is connected to the beam plate (12).

2. The cantilever beam structured roadbed according to claim 1, characterized in that: Each of the roadbed units (1) further comprises a template; The template has a grouting cavity with an upper opening, and a socket is provided at the bottom of the template; When the pile foundation (11) is inserted into the slope (2), the template can be erected on the top of the slope (2) and the insertion hole can be inserted into the top of the pile foundation (11), the cast-in-situ concrete in the grouting cavity forms the beam plate (12) and the bottom of the beam plate (12) is connected to the top of the pile foundation (11).

3. The cantilever beam structured roadbed according to claim 1, characterized in that: A connected pile foundation hole can be dug on the slope (2) and the bedrock (3), and the pile foundation (11) is a cast-in-situ reinforced concrete structure arranged in the pile foundation hole; The number of pile foundations (11) provided in each roadbed unit (1) is at least one group; Each group of pile foundations (11) includes at least two pile foundations (11), and the at least two pile foundations (11) are arranged at intervals along the lateral direction of the top of the slope (2), and the total depth of each pile foundation (11) inserted into the slope (2) and the bedrock (3) is the same; When multiple groups of pile foundations (11) are provided, the multiple groups of pile foundations (11) are arranged at intervals along the longitudinal direction of the top of the slope (2).

4. The cantilever beam structured roadbed according to claim 1, characterized in that: The bottom of the beam plate (12) protrudes downward to form a support seat (121) for connecting to the pile foundation (11); The thickness of the beam plate (12) is 1.0-1.2m; The thickness of the support seat (121) is 1.8-2.0m.

5. The cantilever beam structured roadbed according to claim 1, characterized in that: The pile foundation (11) is located at the slope (2) and is sleeved with a steel sleeve, and the steel sleeve is located inside the slope (2).

6. The cantilever beam structured roadbed according to claim 1, characterized in that: The top surface and bottom surface of the beam plate (12) are arranged in parallel; A pavement structure (14) is laid on top of the beam slabs (12) in the plurality of roadbed units (1), and the pavement structure (14) is capable of forming a smooth road surface; When the longitudinal gradient of the top of the side slope (2) is greater than or equal to 4%, the beams and slabs (12) in two adjacent roadbed units (1) are staggered and the longitudinal gradients of the beams and slabs (12) are both greater than or equal to 4%.

7. The cantilever beam structured roadbed according to claim 6, characterized in that: When the roadbed unit (1) is arranged on a curved section of the slope (2), the outer side of the top of the pavement structure (14) is higher than the inner side in the transverse direction; When the roadbed unit (1) is arranged on a straight section of the side slope (2), the middle of the top of the pavement structure (14) is higher than both sides in the transverse direction.

8. The cantilever beam structured roadbed according to claim 6, characterized in that: The pavement structure (14) includes an LC20 lightweight concrete layer (142).

9. The cantilever beam structured roadbed according to claim 8, characterized in that: The pavement structure (14) further comprises a waterproof coiled material (141), a cement-stabilized crushed stone base layer (143) and an asphalt concrete pavement layer (144); The waterproof coiled material (141), the LC20 lightweight concrete layer (142), the cement-stabilized crushed stone base layer (143) and the asphalt concrete pavement layer (144) are arranged in sequence from bottom to top; The total thickness of the pavement structure (14) is no more than 1 m.

10. The cantilever beam structured roadbed according to claim 6, characterized in that: A floor covering (15) extending longitudinally is provided on the outer side of the beam plate (12) in the transverse direction; A railing or guardrail is provided on the top of the floor covering (15).

Images