Stepped slab culvert suitable for large longitudinal slope oil and gas pipeline protection structure

Abstract

The stepped slab culvert suitable for the large longitudinal slope oil and gas pipeline protection structure comprises a plurality of sections which are transversely arranged at equal intervals, each section comprises two cushion layers placed in the ground, and the two cushion layers are both located below an oil and gas pipeline and symmetrically distributed with the oil and gas pipeline as the center; a left side foundation and a right side foundation are arranged on the tops of the two symmetrically-distributed cushion layers correspondingly, an oil and gas pipeline needing to be protected is arranged between the left side foundation and the right side foundation, and the bottom face of the left side foundation and the bottom face of the right side foundation are arranged in a step shape in the transverse direction; a left culvert body and a right culvert body are arranged on the top faces of the left foundation and the right foundation respectively, and cover plates are arranged on the top faces of the left culvert body and the right culvert body. The current situation of a large longitudinal slope of the oil and gas pipeline is ingeniously combined, the foundation embedding depth is designed to be gradually changed by combining with the longitudinal elevation of the oil and gas pipeline, the requirements for the foundation bearing capacity of each section of foundation can be different, and therefore the work amount of foundation treatment is reduced.

Description

Technical Field

[0001] The utility model relates to the field of intersection protection of highways and oil and gas pipelines, and in particular to a stepped cover culvert suitable for a protective structure of an oil and gas pipeline with a large longitudinal slope. Background Art

[0002] At present, in the construction of highway projects, it is often the case that highways intersect with gas pipelines and oil pipelines (hereinafter referred to as "oil and gas pipelines"). When the highway adopts a roadbed to intersect with the oil and gas pipelines, the oil and gas pipelines within the influence range of the roadbed should be protected by a cover culvert structure to ensure the safety of the oil and gas pipelines buried under the roadbed after the highway is completed and opened to traffic. In the actual construction of highway projects, the specific location and burial depth of the oil and gas pipelines should be excavated and explored first, and then the specific protection plan should be determined. When the oil and gas pipelines that need to be protected have a large longitudinal slope, if the cover culverts arranged at the same height are still used for protection design, the height of the cover culvert body structure needs to be increased to meet the full-section protection of the oil and gas pipelines (such as Figure 1 For example, with a contoured layout, the net culvert height needs to reach 5.5m. The increased height of the slab culvert structure also requires a corresponding increase in the foundation bearing capacity. Each segment of the slab culvert requires a higher foundation bearing capacity, and the foundation treatment workload is also large. The structural design is not rational and has poor economic efficiency. Furthermore, the support beams below the oil and gas pipelines cannot be implemented due to elevation, which also reduces the force-bearing effect of the split slab culvert. Due to the large longitudinal slope of the oil and gas pipelines, the foundation depth varies greatly at different locations. Temporary support measures are required during foundation construction at locations with greater depths, making construction difficult and posing a high safety risk.

[0003] In summary, for oil and gas pipelines with large longitudinal slopes, if conventional uniform-height cover culvert protection structures are still used, the structural stress will be unreasonable, the economy will be poor, the construction will be difficult, and the construction safety risks will be high. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide a stepped cover culvert suitable for a protective structure of an oil and gas pipeline with a large longitudinal slope. The buried depth of the cover culvert foundation is gradually designed in combination with the longitudinal buried depth height of the oil and gas pipeline. The buried depth of the foundation is basically consistent with the elevation of the bottom of the oil and gas pipeline. The elevation of the top surface of the foundation is controlled so as not to exceed the top surface of the oil and gas pipeline, so that support beams can be set between the separate foundations. The force on the cover culvert is more reasonable, the foundation excavation project volume is small, the construction difficulty is reduced, and the safety of the structure is improved.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A stepped slab culvert suitable for protecting an oil and gas pipeline with a large longitudinal slope, the culvert comprising a plurality of segments arranged at equal intervals in the transverse direction, each of the segments comprising two cushion layers placed in the ground, both cushion layers being located below the oil and gas pipeline and symmetrically distributed around the oil and gas pipeline;

[0007] A left foundation and a right foundation are respectively provided on the top of the two symmetrically distributed cushion layers, an oil and gas pipeline to be protected is arranged between the left foundation and the right foundation, and the bottom surfaces of the left foundation and the right foundation are arranged in a stepped manner in the transverse direction;

[0008] The top surfaces of the left foundation and the right foundation are respectively provided with a left culvert body and a right culvert body, and the top surfaces of the left culvert body and the right culvert body are provided with a cover plate.

[0009] Optionally, the bottom elevations of the left foundation and the right foundation are consistent with the bottom elevations of the oil and gas pipeline.

[0010] Optionally, the top surface elevations of the left foundation and the right foundation do not exceed the top surface elevation of the oil and gas pipeline.

[0011] Optionally, medium-coarse sand material is backfilled between the left culvert body and the right culvert body, and a gap of 0.2m is reserved between the backfilled medium-coarse sand material and the bottom surface of the cover plate.

[0012] Optionally, three transverse support beams are provided between the left foundation and the right foundation included in each of the segments.

[0013] Optionally, settlement joints are provided between two adjacent segments to accommodate uneven settlement of the foundation.

[0014] Compared with the prior art, the present invention has at least the following effects:

[0015] 1. The stepped separated cover culvert structure of the present invention adopts a design that is consistent with the longitudinal slope of the oil and gas pipeline. The foundation burial depth is gradually designed in combination with the longitudinal elevation of the oil and gas pipeline. At the same time, the foundation burial depth is basically consistent with the bottom elevation of the oil and gas pipeline. The foundation bearing capacity requirements of each segment foundation are different. The foundation bearing capacity requirements of the foundation with a small burial depth can also be reduced, thereby reducing the amount of foundation treatment engineering and saving construction costs; the excavation engineering volume of each segment foundation is small, the construction difficulty is reduced, the safety of foundation construction is improved, and at the same time, the disturbance of construction excavation to the oil and gas pipeline is reduced, thereby improving the safety of the oil and gas pipeline during construction.

[0016] 2. The utility model has a stepped separated cover culvert structure that can be equipped with transverse support beams, and the culvert body is backfilled with medium-coarse sand materials to improve the stress-bearing effect of the separated cover culvert structure, further enhance the safety of protecting the oil and gas pipeline structure, and has good promotion potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 This is an example diagram of the prior art slab culvert arrangement at equal heights;

[0019] Figure 2 This is the elevation layout drawing of the stepped slab culvert;

[0020] Figure 3 This is the plan layout of the stepped slab culvert;

[0021] Figure 4 This is the cross-section of the stepped slab culvert;

[0022] Figure 5 This is an example diagram of a stepped slab culvert.

[0023] Description of reference numerals:

[0024] 1- cushion layer, 2-1, left foundation, 2-2, right foundation, 3-1, left culvert body, 3-2, right culvert body, 4- transverse support beam, 5- oil and gas pipeline, 6- medium-coarse sand material, 7- cover plate, 8- settlement joint, 9- road surface + roadbed. DETAILED DESCRIPTION

[0025] In order to facilitate ordinary technicians in this field to understand and implement the present invention, the present invention is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0026] like Figure 2 、 Figure 3 As shown, an embodiment of the utility model provides a stepped cover culvert suitable for a protective structure of an oil and gas pipeline with a large longitudinal slope. The cover culvert includes a plurality of segments arranged at intervals of 4m in the horizontal direction. Each segment adopts a left and right side separated foundation arrangement. A settlement joint 8 is set between two adjacent segments to adapt to uneven settlement of the foundation.

[0027] like Figure 4As shown, each segment includes two cushion layers 1 placed in the ground, both of which are located below the oil and gas pipeline 5 and are symmetrically distributed with the oil and gas pipeline 5 as the center; a left foundation 2-1 and a right foundation 2-2 are fixed on the top of the two symmetrically distributed cushion layers 1, and the oil and gas pipeline 5 to be protected is arranged between the left foundation 2-1 and the right foundation 2-2, and the bottom surfaces of the left foundation 2-1 and the right foundation 2-2 are arranged in a stepped manner along the horizontal direction; three transverse support beams 4 are arranged between the left foundation 2-1 and the right foundation 2-2 included in each segment, and the left culvert body 3-1 and the right culvert body 3-2 are respectively provided on the top surfaces of the left foundation 2-1 and the right foundation 2-2, and the left culvert body 3-1 and the right culvert body 3-2 are provided on the top surfaces. Cover plates 7 are provided on the top surfaces of the left culvert body 3-1 and the right culvert body 3-2.

[0028] As an optimal implementation method of the present invention, the longitudinal slope of the oil and gas pipeline 5 reaches 11%, the bottom elevations of the left foundation 2-1 and the right foundation 2-2 are consistent with the bottom elevations of the oil and gas pipeline 5, and the cover culvert is arranged in a stepped manner along the longitudinal direction (ensuring that there is cross-overlap between the cover culvert foundations of each segment and that there is no soil leakage between the foundations). The foundation burial depths at each longitudinal segment position are different, and the foundation bearing capacity requirements of each segment foundation are different. With the stepped arrangement, the foundation bearing capacity requirements of the foundation with a small burial depth can also be reduced, thereby reducing the amount of foundation treatment engineering and saving construction costs; the foundation construction excavation depth and engineering volume can be minimized, while reducing the construction excavation disturbance to the oil and gas pipeline, and also improving the safety of the oil and gas pipeline during construction.

[0029] As a preferred embodiment of the present invention, the elevations of the top surfaces of the left foundation 2-1 and the right foundation 2-2 are controlled so as not to exceed the top surface of the oil and gas pipeline 5, so that a transverse support beam 4 can be set between the left foundation 2-1 and the right foundation 2-2 of the cover culvert. The transverse support beam 4 can be arranged at a transverse interval of 1.8m to better ensure the force requirements of the cover culvert structure. The transverse support beam 4 adopts a construction process of prefabrication in advance and then on-site installation to avoid interference with the oil and gas pipeline caused by on-site vertical formwork casting.

[0030] As a preferred embodiment of the present invention, the cover plate 7 is a reinforced concrete structure, which is prefabricated in advance and then hoisted and installed in place, avoiding the use of scaffolding and cast-in-place to avoid interference with the oil and gas pipeline caused by the cast-in-place construction of the cover plate.

[0031] As a preferred embodiment of the present invention, medium-coarse sand material 6 is backfilled between the left culvert body 3-1 and the right culvert body 3-2. The backfilled medium-coarse sand material 6 wraps the oil and gas pipeline 5, and a gap of 0.2m is reserved from the bottom surface of the cover plate 7 to ensure that the backfilled medium-coarse sand will not be squeezed after the cover plate is deformed by force in the later stage, thereby avoiding squeezing of the oil and gas pipeline.

[0032] like Figure 5As shown in the utility model discloses a cover slab culvert is arranged in longitudinal step, and the net height of culvert can be reduced to 3.5m (the unit in the drawing is cm), the depth of cover slab culvert foundation is set according to the longitudinal depth position of oil and gas pipeline, and the depth of foundation of each section of cover slab culvert is different, and it presents step along the longitudinal direction, and the elevation of foundation top surface is controlled according to not exceeding the top surface of oil and gas pipeline, so that the support beam between the separated foundation can be set, and the stress of cover slab culvert is more reasonable. The depth of foundation of each section of cover slab culvert can be minimum, and the excavation engineering quantity is reduced to the maximum, the construction difficulty is reduced, the requirement of foundation bearing capacity is reduced, and the structure stress is more reasonable.

[0033] It should be understood that the above description of the preferred embodiments is more detailed, and therefore cannot be considered as limiting the scope of protection of the utility model patent, and ordinary skilled in the art can make substitutions or deformations under the inspiration of the utility model without departing from the scope of protection of the utility model claims, which all fall within the protection scope of the utility model, and the protection scope of the utility model should be subject to the appended claims.

Claims

1. A stepped cover culvert suitable for a protective structure of an oil and gas pipeline with a large longitudinal slope, characterized in that: The cover culvert comprises a plurality of segments arranged at equal intervals in the transverse direction, each of the segments comprising two cushion layers (1) placed in the ground, both cushion layers (1) being located below the oil and gas pipeline (5) and symmetrically distributed with the oil and gas pipeline (5) as the center; A left foundation (2-1) and a right foundation (2-2) are respectively provided on the tops of the two symmetrically distributed cushion layers (1); an oil and gas pipeline (5) to be protected is arranged between the left foundation (2-1) and the right foundation (2-2); and the bottom surfaces of the left foundation (2-1) and the right foundation (2-2) are arranged in a stepped manner in the transverse direction; The top surfaces of the left foundation (2-1) and the right foundation (2-2) are respectively provided with a left culvert body (3-1) and a right culvert body (3-2), and the top surfaces of the left culvert body (3-1) and the right culvert body (3-2) are provided with a cover plate (7).

2. The stepped cover culvert suitable for a protective structure for oil and gas pipelines with a large longitudinal slope according to claim 1 is characterized in that: The bottom elevations of the left foundation (2-1) and the right foundation (2-2) are consistent with the bottom elevation of the oil and gas pipeline (5).

3. The stepped cover culvert suitable for a protective structure of an oil and gas pipeline with a large longitudinal slope according to claim 1 is characterized in that: The top surface elevations of the left foundation (2-1) and the right foundation (2-2) do not exceed the top surface elevation of the oil and gas pipeline (5).

4. The stepped cover culvert suitable for a protective structure for oil and gas pipelines with a large longitudinal slope according to claim 1 is characterized in that: A medium-coarse sand material (6) is backfilled between the left culvert body (3-1) and the right culvert body (3-2), and a gap of 0.2 m is reserved between the backfilled medium-coarse sand material (6) and the bottom surface of the cover plate (7).

5. The stepped cover culvert suitable for a protective structure of an oil and gas pipeline with a large longitudinal slope according to claim 1 is characterized in that: Three transverse support beams (4) are arranged between the left foundation (2-1) and the right foundation (2-2) included in each segment.

6. The stepped cover culvert suitable for a protective structure for oil and gas pipelines with a large longitudinal slope according to claim 1 is characterized in that: Settlement joints (8) are provided between two adjacent segments to accommodate uneven foundation settlement.

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