Structure for reducing top loading influence of culvert

Abstract

The utility model provides a structure for reducing the influence of culvert top loading. The structure comprises a current culvert, the roadbed filling soil covers the current culvert; the graded broken stone is laid above the roadbed filling soil; the reinforced concrete cover plate is arranged above the graded broken stone; the geogrid is laid above the reinforced concrete cover plate; the roadbed covers the geogrid; and the road surface is paved above the roadbed. The structure for reducing the influence of the loading at the top of the culvert is used for the condition that the load at the top of an old culvert is increased in the road reconstruction process, graded broken stones and a reinforced concrete cover plate are arranged above the roadbed filling soil, and a geogrid is arranged between the reinforced concrete cover plate and the roadbed; the load capacity of the structure above the current culvert can be improved, reflection cracks at the rigid-flexible transition positions of the two ends of the reinforced concrete cover plate can be avoided, meanwhile, an old culvert can be prevented from being dismantled, rebuilt or transformed, and the effects of saving project investment, avoiding resource waste and shortening the construction period are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of road reconstruction engineering, and more specifically relates to a structure for reducing the influence of loading on the top of a culvert. Background Art

[0002] With the sustained and rapid development of my country's economy and society, some roads are unable to meet the rapidly growing traffic needs and are in urgent need of upgrading or reconstruction. During the reconstruction process, some existing culverts have intact structures and functions, but due to the elevation of the road surface or the upgrade of the road grade (such as the common vehicle load grade from highway-II to highway-I), they do not meet the design load requirements, making the old culverts unable to continue to serve and facing demolition and reconstruction or reconstruction. If the old culverts are demolished, rebuilt or reconstructed, it will not only cause a waste of resources and increase project investment, but also extend the construction period, and put great pressure on road maintenance.

[0003] Therefore, it is necessary to take technical measures to protect and utilize the old culvert. The invention patent with application publication number CN113123259A provides a reinforcement structure for shallow buried box culverts on roads, including old box culverts, corbels, slats, reinforcement steel plates, road base, and road surface. The corbels are arranged on the outside of the side walls on the two long sides of the old box culvert, and slats are arranged on both sides of the old box culvert with corbels. One end of the slat is overlapped on the corbel, and the other end is connected to the roadbed. The top surface of the slat is flush with the top surface of the old culvert. The reinforcing steel plate is arranged on the old box culvert and the slab, and is anchored by several anchor bolts. Several grouting pipes are arranged on the reinforcing steel plate. The gap between the reinforcing steel plate and the old box culvert and the slab is filled by the grouting pipes to form a grouting layer. A wire mesh is arranged on the reinforcing steel plate, and the wire mesh is welded to the reinforcing steel plate. The wire mesh plays a role in preventing the pavement structure from slipping. The pavement base is laid on the reinforcing steel plate, the slab, and the roadbed. The pavement surface layer is laid on the pavement base. The reinforcing steel plate, under the constraint of the anchor bolts, forms an integral structure with the old box culvert and the slab that bears the force together. However, the invention is only applicable to shallow buried box culverts. The road elevation is limited by the situation that the road surface cannot be raised to increase the thickness of the covering soil. The steel plate is arranged in the pavement structure in the structure, and the construction is complicated and the economic cost is high.

[0004] The design of box culverts mainly considers the combination of equivalent loads generated by vehicle loads, structural gravity and fill gravity. The increase of vehicle loads and fill gravity will increase the stress conditions of the existing culvert. Therefore, a structure is needed to reduce the impact of the top loading of the culvert, which can not only protect the existing old culverts (including box culverts, cover culverts, circular culverts, etc.), but also take into account economy, convenience and efficiency in construction. Utility Model Content

[0005] On the basis of sufficient investigation and combination with actual projects, from the perspectives of saving investment, technical feasibility, and convenient construction, the purpose of the utility model is to provide a structure that reduces the impact of loading on the top of the culvert to protect the existing old culvert, and to make up for the current deficiencies in the protection and utilization of culverts when the load on the top of the old culvert increases during road reconstruction. The structure can take into account the advantages of economy, convenience and high efficiency in construction.

[0006] To achieve the above object, the utility model provides a structure for reducing the influence of top loading of a culvert, comprising:

[0007] Current culvert;

[0008] Roadbed fill, covering the above the existing culvert;

[0009] Graded crushed stone, laid on top of the roadbed fill;

[0010] a reinforced concrete cover slab disposed above the graded crushed stone;

[0011] A geogrid, laid on top of the reinforced concrete cover slab;

[0012] a roadbed overlying the geogrid; and,

[0013] A road surface is laid on top of the roadbed.

[0014] Furthermore, the width of the geogrid is greater than the width of the reinforced concrete cover plate.

[0015] Furthermore, symmetrical trapezoidal bolsters are provided at both ends of the lower side of the reinforced concrete cover plate; the lower end of the trapezoidal bolster is located in the graded crushed stone layer, and the upper end surface is flush with the upper end surface of the graded crushed stone.

[0016] Furthermore, the height of the trapezoidal bolster is 20 to 40 cm, the bottom width is 40 to 70 cm, and the hypotenuse width is 10 to 30 cm.

[0017] Furthermore, the concrete strength of the reinforced concrete cover slab is not less than C30.

[0018] Furthermore, the width of the reinforced concrete cover plate is 10 to 20 m.

[0019] Furthermore, an inverted trapezoidal groove is excavated on the roadbed fill, and the graded crushed stone is filled in the inverted trapezoidal groove.

[0020] Furthermore, the slope ratio of the inverted trapezoidal groove is 1:1.

[0021] Furthermore, the paving thickness of the graded crushed stone is 50 to 100 cm.

[0022] Furthermore, the existing culvert is any one of a box culvert, a slab culvert or a circular pipe culvert.

[0023] Compared with the prior art, the utility model has the following technical effects:

[0024] The utility model discloses a structure for reducing the influence of loading on the top of a culvert, which is used in the case where the load on the top of an old culvert increases during road reconstruction. By arranging graded crushed stone and a reinforced concrete cover plate above the roadbed fill, and arranging a geogrid between the reinforced concrete cover plate and the roadbed, the load capacity of the structure above the existing culvert can be improved, and reflective cracks can be avoided at the places where the rigidity and flexibility of both ends of the reinforced concrete cover plate are excessive. At the same time, the demolition, reconstruction or reconstruction of the old culvert (i.e., the existing culvert) can be avoided, thereby achieving the effects of saving project investment, avoiding waste of resources and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of a structure for reducing the impact of culvert top loading provided by an embodiment of the utility model.

[0027] Among them, the reference numerals in the figure are:

[0028] 1. Existing culvert, 2. Roadbed fill, 3. Graded crushed stone, 4. Reinforced concrete cover, 5. Geogrid, 6. Roadbed, 7. Pavement. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0031] See also Figure 1 Now, a structure for reducing the impact of culvert top loading provided by an embodiment of the utility model is described.

[0032] In one embodiment of the utility model, a structure for reducing the impact of culvert top loading in the utility model embodiment includes: an existing culvert 1, a roadbed fill 2, graded crushed stone 3, a reinforced concrete cover 4, a geogrid 5, a roadbed 6 and a road surface 7. The roadbed fill 2 covers the existing culvert 1; the graded crushed stone 3 is laid on the roadbed fill 2; the reinforced concrete cover 4 is arranged on the graded crushed stone 3; the geogrid 5 is laid on the reinforced concrete cover 4; the roadbed 6 covers the geogrid 5; and the road surface 7 is laid on the roadbed 6.

[0033] In this embodiment, the roadbed 6 is mainly used as the roadbed filler required for road expansion, reconstruction and heightening, and is filled in accordance with the specification requirements. The road surface 7 is located above the roadbed 6, including a surface layer and a base layer, which is consistent with a general road section. The road surface 7 can be a cement road surface or an asphalt road surface.

[0034] In this embodiment, a geogrid 5 is laid on the reinforced concrete cover plate 4 to prevent uneven settlement at the rigid-flexible transition between the reinforced concrete cover plate 4 and the roadbed 6, and to avoid reflection cracks at the rigid-flexible transition at both ends of the reinforced concrete cover plate 4. Preferably, the width of the geogrid 5 is greater than the width of the reinforced concrete cover plate 4.

[0035] In this embodiment, graded crushed stone 3 is provided below the reinforced concrete cover plate 4 to improve the bearing capacity of the reinforced concrete cover plate 4 .

[0036] In this embodiment, an inverted trapezoidal groove is excavated on the roadbed fill 2, and the graded crushed stone 3 is filled in the inverted trapezoidal groove to facilitate compaction of the crushed stone. Preferably, the slope ratio of the inverted trapezoidal groove is 1:1.

[0037] A structure for reducing the impact of loading on the top of a culvert according to an embodiment of the utility model is used in the case where the load on the top of an old culvert increases during road reconstruction. By arranging graded crushed stone 3 and a reinforced concrete cover plate 4 above the roadbed fill 2, and arranging a geogrid 5 between the reinforced concrete cover plate 4 and the roadbed 6, the load capacity of the structure above the existing culvert 1 can be improved, and reflective cracks can be avoided at the places where the rigidity and flexibility of the two ends of the reinforced concrete cover plate 4 are excessive. At the same time, the demolition, reconstruction or reconstruction of the old culvert (i.e., the existing culvert 1) can be avoided, thereby achieving the effects of saving project investment, avoiding waste of resources, and shortening the construction period.

[0038] The width of the reinforced concrete cover plate 4 is adjusted according to the size of the existing culvert 1, and the width of the reinforced concrete cover plate 4 can be set to 10-20m. In this embodiment, the width L of the reinforced concrete cover plate 4 is 1 It is set to 10m, with a thickness of H=0.4m, and its length is consistent with the length of the existing culvert 1. The concrete strength of the reinforced concrete cover 4 is not less than C30, so that it has good load capacity.

[0039] In this embodiment, the width L of the geogrid 5 is L 1 +2L 2 =20m, L2=5m. The ultimate tensile strength of the geogrid 5 is ≥50kN / m, and the tensile strength at 2% elongation is ≥20kN / m.

[0040] In this embodiment, the existing culvert 1 may be in the form of a box culvert, a cover culvert or a circular pipe culvert, etc. Figure 1 Taking the rectangular box culvert as an example, it is located below the roadbed fill 2, and the existing culvert 1 is in good operating condition.

[0041] In this embodiment, the roadbed fill 2 below the graded crushed stone 3 is the existing roadbed or the roadbed refilled after the old road is treated, and has been compacted and leveled according to the roadbed specification requirements. The laying thickness of the graded crushed stone 3 is 50-100cm, for example, 80cm. The aggregate used is mainly natural gravel or rolled crushed stone, and the mud content shall not be greater than 10% of the sand mass (particle size less than 5mm), and the long strips and flat particles should not exceed 20%, and harmful impurities such as clay blocks and plants shall not be contained. The CBR value of the graded crushed stone 3 should not be less than 80%, and the crushing value should not be greater than 26%.

[0042] In this embodiment, symmetrical trapezoidal bolsters are also provided at both ends of the lower side of the reinforced concrete cover 4, and the trapezoidal bolsters are cast and implemented synchronously with the reinforced concrete cover 4; the lower end of the trapezoidal bolster is located in the graded gravel 3, and the upper end surface is flush with the upper end surface of the graded gravel 3. In this way, the lower side of the reinforced concrete cover 4 has a trapezoidal cross-section, and under the action of the upper vehicle load and gravity, the gravel between the trapezoidal bolsters can be compacted, thereby further improving the bearing capacity of the reinforced concrete cover 4. The height a of the trapezoidal bolster can be set to 20 to 40 cm, the bottom width b can be set to 40 to 70 cm, and the hypotenuse width c can be set to 10 to 30 cm. For example, the height a of the trapezoidal bolster is 30 cm, the bottom width b is 50 cm, and the hypotenuse width c is 20 cm.

[0043] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A structure for reducing the impact of top loading on a culvert, characterized in that: include: Current culvert; Roadbed fill, covering the above the existing culvert; Graded crushed stone, laid on top of the roadbed fill; a reinforced concrete cover slab disposed above the graded crushed stone; A geogrid, laid on top of the reinforced concrete cover slab; a roadbed overlying the geogrid; as well as, A road surface is laid on top of the roadbed.

2. A structure for reducing the impact of top loading on a culvert as claimed in claim 1, characterized in that: The width of the geogrid is greater than the width of the reinforced concrete cover plate.

3. A structure for reducing the impact of top loading on a culvert as claimed in claim 1, characterized in that: Symmetrical trapezoidal bolsters are provided at both ends of the lower side of the reinforced concrete cover plate; the lower end of the trapezoidal bolster is located in the graded crushed stone layer, and the upper end surface is flush with the upper end surface of the graded crushed stone.

4. A structure for reducing the impact of top loading on a culvert as claimed in claim 3, characterized in that: The height of the trapezoidal bolster is 20-40 cm, the bottom width is 40-70 cm, and the hypotenuse width is 10-30 cm.

5. The structure for reducing the impact of top loading on a culvert as claimed in claim 1, characterized in that: The concrete strength of the reinforced concrete cover slab is not less than C30.

6. A structure for reducing the impact of top loading on a culvert as claimed in claim 1, characterized in that: The width of the reinforced concrete cover plate is 10 to 20 meters.

7. A structure for reducing the impact of top loading on a culvert as claimed in claim 1, characterized in that: An inverted trapezoidal groove is excavated on the roadbed fill, and the graded crushed stone is filled in the inverted trapezoidal groove.

8. A structure for reducing the impact of top loading on a culvert as claimed in claim 7, characterized in that: The slope ratio of the inverted trapezoidal groove is 1:

1.

9. The structure for reducing the impact of top loading on a culvert as claimed in claim 1, characterized in that: The paving thickness of the graded crushed stone is 50 to 100 cm.

10. A structure for reducing the impact of top loading on a culvert according to any one of claims 1 to 9, characterized in that: The existing culvert is any one of a box culvert, a slab culvert or a circular pipe culvert.

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