Photovoltaic support anchor rod foundation based on bare rock foundation with medium-low weathering degree

Abstract

The utility model belongs to the technical field of photovoltaic support foundations, and particularly relates to a photovoltaic support anchor rod foundation based on an exposed rock foundation with medium and low weathering degrees. According to the technical scheme, the photovoltaic support anchor rod foundation based on the exposed rock foundation with the medium-low weathering degree comprises an anchor hole drilled in rock and a pile casing mold arranged on the ground and communicated with the anchor hole, an anchor rod is arranged in the anchor hole, a ground pile steel pipe is arranged in the pile casing mold, the anchor rod is welded to the ground pile steel pipe, and concrete is poured into the anchor hole and the pile casing mold. Concrete is poured into the lower section of the ground pile steel pipe. According to the photovoltaic support anchor rod foundation based on the exposed rock foundation with the medium-low weathering degree, the engineering construction difficulty is reduced by reducing the buried depth and the hole diameter of the foundation, the construction period is shortened, and the construction progress is accelerated.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic support foundations, and particularly relates to a photovoltaic support anchor foundation based on a moderately and lowly weathered exposed rock foundation. Background Art

[0002] With the country's strong development of clean energy, the proportion of mountain photovoltaic projects is increasing day by day. The mountain terrain has large undulations, and the geological conditions are usually relatively complex. Moreover, the layout of power generation units in mountain photovoltaic projects is characterized by a wide distribution range and scattered distribution. Therefore, there may be many types of foundation types involved in a single project. A mountain photovoltaic project is a photovoltaic project whose construction land is located in mountainous and hilly areas. Compared with previous flat photovoltaic projects, the probability and distribution area of moderately and lowly weathered rock foundations distributed in the site will increase significantly.

[0003] For moderately and lowly weathered hard rock foundations, foundation pit excavation or pile foundation drilling has always been a difficult part of on-site construction. Especially for equipment foundations with high requirements for the accuracy of foundation positions, such as photovoltaic module support foundations, how to accurately and efficiently complete the construction of photovoltaic support foundations while ensuring the structural safety of the support is a key issue of common concern to construction units, supervision units, construction units, and design units.

[0004] The anchor foundation is very suitable for moderately and lowly weathered hard rock foundations. Compared with common conventional foundation forms for photovoltaic supports such as single-row pile foundations, double-row pile foundations, independent foundations, and strip foundations, the anchor foundation has the characteristics of shallow hole depth, small hole diameter, and no need for large excavation. The amount of excavation or drilling required during the on-site construction stage is less, and the construction difficulty is lower. It is more suitable for application in areas with difficult excavation and drilling such as moderately and lowly weathered hard rock foundations.

[0005] The common anchor foundation form in previous engineering projects is the group anchor form, which is mostly used for the treatment of high and steep slopes. Content of the Utility Model

[0006] In order to solve the above problems existing in the prior art, the purpose of the utility model is to provide a photovoltaic support anchor foundation based on a moderately and lowly weathered exposed rock foundation, which reduces the engineering construction difficulty, shortens the construction period, and speeds up the construction process by reducing the foundation burial depth and hole diameter.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A photovoltaic support anchor foundation based on a moderately and lowly weathered exposed rock foundation includes anchor holes drilled in the rock, a casing mold arranged on the ground and communicated with the anchor holes, anchor rods arranged in the anchor holes, a pile pipe arranged in the casing mold, the anchor rods are welded to the pile pipe, concrete is poured into the anchor holes and the casing mold, and concrete is poured into the lower section of the pile pipe.

[0009] For a hard rock foundation, if a pile foundation is used for a conventional PV support foundation, it is likely to cause problems such as difficult drilling, deviation or inclination of the drilled hole. The bolt foundation of the single-anchor form is adopted in the present utility model. Compared with the pile foundation, both the aperture and the depth of the hole are greatly reduced, which is convenient for construction, easy to control the construction quality, and reduces the construction period and construction cost.

[0010] The load of the PV support is small, and the volume of the required foundation is correspondingly small. Compared with the commonly used bolt foundation of the group-anchor form, the drilling of the single-anchor form in the present utility model does not need to consider the effective spacing between bolts, thus effectively reducing the size of a single foundation cap. Moreover, the single-anchor form only needs to locate the number of one bolt, and the requirement for precise construction positioning is relatively low, relatively improving the construction quality.

[0011] For a mountain PV project, on the premise of meeting the policy that no large-scale excavation is carried out for PV construction, the single-anchor form can effectively reduce the number of holes compared with the group-anchor form, reduce the workload of the drilling construction operation, thus greatly improving the construction efficiency and shortening the construction period.

[0012] The present utility model does not require a platform, reduces the damage to the ecological environment, and is conducive to the project passing the later environmental protection and water and soil conservation acceptance, etc.

[0013] As a preferred solution of the present utility model, the diameter of the anchor hole is 70 mm, and the depth of the anchor hole is 700 mm.

[0014] As a preferred solution of the present utility model, the diameter of the bolt is 16 mm.

[0015] As a preferred solution of the present utility model, the inner diameter of the casing mold is 180 mm.

[0016] As a preferred solution of the present utility model, after concrete is poured in the casing mold, a foundation cap is formed, and the slope thickness at the top of the foundation cap is 1 - 2 cm.

[0017] As a preferred solution of the present utility model, the diameter of the ground pile steel pipe is 76 mm, and there is a 50 mm gap between the ground pile steel pipe and the ground.

[0018] As a preferred solution of the present utility model, the bolt is welded to the side wall of the ground pile steel pipe, and the welding height of the bolt and the ground pile steel pipe is 200 mm.

[0019] As a preferred solution of the present utility model, a column steel pipe is connected to the upper part of the ground pile steel pipe.

[0020] As a preferred solution of the present utility model, the ground pile steel pipe and the column steel pipe are connected by a plurality of bolts.

[0021] As a preferred solution of the present utility model, a base sealing rubber ring is provided between the top of the ground pile steel pipe and the column steel pipe.

[0022] The beneficial effects of the present utility model are as follows:

[0023] 1. For hard rock foundations, if pile foundations are used for conventional PV support foundations, it is easy to cause problems such as difficult drilling, hole deviation or inclination. The present utility model adopts a single-anchor form of anchor foundation. Compared with pile foundations, the hole diameter and hole depth are significantly reduced, which is convenient for construction, easy to control construction quality, and reduces construction period and cost.

[0024] 2. The load of the PV support is small, and the required volume of the foundation is correspondingly small. Compared with the commonly used group-anchor form of anchor foundation, the single-anchor form of the present utility model does not need to consider the effective spacing between the anchor rods, thus effectively reducing the size of a single foundation cap. Moreover, the single-anchor form only needs to position the number of one anchor rod, and the requirement for precise construction positioning is relatively low, relatively improving construction quality.

[0025] 3. For mountain PV projects, on the premise of meeting the policy of not carrying out large-scale excavation for PV construction, the single-anchor form can effectively reduce the number of holes compared with the group-anchor form, reduce the workload of drilling construction operations, thus greatly improving construction efficiency and shortening the construction period.

[0026] 4. The present utility model does not require a bench, reduces the damage to the ecological environment, and is conducive to the project passing the later environmental protection and water and soil conservation acceptance. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the present utility model;

[0028] Figure 2 is Figure 1 the cross-sectional view at A-A in

[0029] In the figure: 1 - anchor hole; 2 - casing mold; 3 - anchor rod; 4 - ground pile steel pipe; 5 - foundation cap; 6 - anchor pile; 7 - column steel pipe; 8 - base sealing rubber ring; 9 - reinforcing plate. Detailed Embodiments

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0032] As Figures 1 to 2 shown, the photovoltaic support anchor foundation based on the moderately and lowly weathered exposed rock foundation in this embodiment includes an anchor hole 1 drilled in the rock, a casing mold 2 arranged on the ground and communicated with the anchor hole 1. An anchor rod 3 is arranged in the anchor hole 1, a ground pile steel pipe 4 is arranged in the casing mold 2, the anchor rod 3 is welded to the ground pile steel pipe 4, concrete is poured into the anchor hole 1 and the casing mold 2, and concrete is poured into the lower section of the ground pile steel pipe 4. After the concrete is poured in the casing mold 2, a bearing platform 5 is formed, and after the concrete is poured in the anchor hole 1, an anchor pile 6 is formed.

[0033] Among them, the diameter of the anchor hole 1 is 70 mm, and the depth of the anchor hole 1 is 700 mm. The diameter of the anchor rod 3 is 16 mm. The inner diameter of the casing mold 2 is 180 mm. The slope-finding thickness at the top of the bearing platform 5 is 1 - 2 cm. The diameter of the ground pile steel pipe 4 is 76 mm, and there is a 50-mm gap between the ground pile steel pipe 4 and the ground. The anchor rod 3 is welded to the side wall of the ground pile steel pipe 4, and the welding height of the anchor rod 3 and the ground pile steel pipe 4 is 200 mm.

[0034] The upper part of the ground pile steel pipe 4 is connected with a column steel pipe 7, and the diameter of the column steel pipe 7 is 60 mm. The ground pile steel pipe 4 and the column steel pipe 7 are connected by a plurality of bolts. The bolt size is M14*40. The nuts of the three upper-side bolts are pre-welded and galvanized with the ground pile steel pipe 4. Two flat washers, one spring washer, and one nut are arranged for the lower-side bolt; a 36*36*3 reinforcing plate 9 is arranged with the bolt axis parallel to the east-west direction and is pre-welded with the ground pile steel pipe 4. A base sealing rubber ring 8 is arranged between the top of the ground pile steel pipe 4 and the column steel pipe 7.

[0035] The rock anchor rod 3 foundation is a special foundation form in which a concrete casing or directly concrete is poured into a hole drilled in a rock foundation, and then steel bars and its anchor rod 3 are installed in the concrete to fix the rock and the foundation together. The specific process is as follows:

[0036] 1. Construction preparation:

[0037] 1) Prepare relevant design drawings and conduct on-site exploration;

[0038] 2) Compare the geological conditions at the foundation location with the design and select a suitable hole-forming process;

[0039] 3) Inspect construction equipment and instruments.

[0040] 2. Layout and drill holes according to the design drawings:

[0041] 3. Drill holes, clean holes and inspect holes:

[0042] 1) During the drilling process of the anchor rod 3, the hole forming quality of the anchor rod 3 hole must be strictly controlled;

[0043] 2) After the drilling construction is completed, the mud, silt and gravel around the base surface shall be cleaned, and the anchor hole 1 shall be washed until there is no sediment when touching the inner wall of the hole by hand;

[0044] 3) Chip the smooth rock base surface and remove all the easily movable stones;

[0045] 4) After the anchor hole 1 is formed, it shall be inspected by professional personnel, and the next process can be constructed only after the inspection is qualified.

[0046] 4. Install the anchor rod 3 and fabricate the steel bars of the bearing platform 5:

[0047] 1) When fabricating and installing the rod body of the anchor rod 3, rust and oil stains shall be removed, and the rod body shall be prevented from bending;

[0048] 2) Before installing the anchor rod 3, it is necessary to check and verify the dimensions of each part of the anchor hole 1 and the specifications and lengths of the anchor rod 3. The over-deep part of the anchor hole 1 shall be filled with fine aggregate concrete;

[0049] 3) When installing the anchor rod 3, it shall be vertically lowered into the anchor hole 1, and attention shall be paid not to knock the periphery of the hole opening to prevent foreign matters from being brought into the hole.

[0050] 5. Pour the anchor pile 6 and the bearing platform 5:

[0051] 1) The concrete used is fine aggregate concrete;

[0052] 2) The pouring volume of the concrete shall be strictly calculated and controlled.

[0053] 6. Curing.

[0054] Combined with the characteristics that the foundation where the foundation is located is an exposed rock foundation with low weathering degree and the load of the photovoltaic support is small, the form of direct anchor is adopted. At the same time, the present utility model is an optimized foundation construction plan for the exposed rock foundation on the basis of adopting the micro-pile plan. The engineering quantities such as excavation drilling, steel bar and concrete pouring of the present utility model should not be more than those of the micro-pile plan, and the construction difficulty should not be greater than that of the common micro-pile plan. Combining the calculation results, the direct anchor foundation with a single anchor rod 3 is adopted.

[0055] For hard rock foundations, if pile foundations are used for conventional PV support foundations, it is easy to cause problems such as difficult drilling, hole deviation or inclination. The bolt 3 foundation of the single-anchor form is adopted in the present utility model. Compared with the pile foundation, the aperture and hole depth are greatly reduced, which is convenient for construction, easy to control the construction quality, and reduces the construction period and cost.

[0056] Table 1 Comparison table of the single-pile engineering quantity of the single-rock bolt 3 foundation (double-row arrangement) and the single pile of the double-row pile foundation.

[0057]

[0058]

[0059] The load of the PV support is small, and the volume of the required foundation is correspondingly small. Compared with the bolt 3 foundation of the commonly used group-anchor form, the drilling of the single-anchor form of the present utility model does not need to consider the effective spacing between bolts 3, thus effectively reducing the size of a single foundation cap 5. Moreover, the single-anchor form only needs to locate the quantity of one bolt 3, and the requirement for precise construction positioning is relatively low, relatively improving the construction quality.

[0060] For mountain PV projects, on the premise of meeting the policy that no large-scale excavation is carried out for PV construction, the single-anchor form can effectively reduce the number of holes compared with the group-anchor form, reduce the workload of the drilling construction operation, and thus greatly improve the construction efficiency and shorten the construction period.

[0061] The present utility model does not require a bench, reduces the damage to the ecological environment, and is conducive to the project passing the later environmental protection and water and soil conservation acceptance.

[0062] The present utility model is not limited to the above optional implementation manners. Anyone can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they are all within the protection scope of the present utility model.

Claims

1. A photovoltaic support anchor foundation based on a medium to low weathering exposed rock foundation, characterized by: The invention comprises an anchor hole (1) drilled in a rock, a casing mold (2) arranged on the ground and connected to the anchor hole (1), an anchor rod (3) arranged in the anchor hole (1), a ground pile steel pipe (4) arranged in the casing mold (2), the anchor rod (3) and the ground pile steel pipe (4) being welded, concrete being poured in the anchor hole (1) and the casing mold (2), and concrete being poured in the lower section of the ground pile steel pipe (4).

2. The photovoltaic support anchor foundation based on a medium to low weathering degree exposed rock foundation according to claim 1, characterized in that: The diameter of the anchor hole (1) is 70 mm, and the depth of the anchor hole (1) is 700 mm.

3. The photovoltaic support anchor foundation based on a medium to low weathering degree exposed rock foundation according to claim 1, characterized in that: The diameter of the anchor rod (3) is 16 mm.

4. The photovoltaic support anchor foundation based on a medium to low weathering degree exposed rock foundation according to claim 1, characterized in that: The inner diameter of the casing mold (2) is 180 mm.

5. The photovoltaic support anchor foundation based on a medium to low weathering degree exposed rock foundation according to claim 4, characterized in that: After pouring concrete in the casing mold (2), a cap (5) is formed, and the slope thickness of the top of the cap (5) is 1 to 2 cm.

6. The photovoltaic support anchor foundation based on a medium to low weathering degree exposed rock foundation according to claim 1, characterized in that: The diameter of the ground pile steel pipe (4) is 76 mm, and a gap of 50 mm is left between the ground pile steel pipe (4) and the ground.

7. The photovoltaic support anchor foundation based on a medium to low weathering degree exposed rock foundation according to claim 1, characterized in that: The anchor rod (3) is welded to the side wall of the ground pile steel pipe (4), and the welding height between the anchor rod (3) and the ground pile steel pipe (4) is 200 mm.

8. The photovoltaic support anchor foundation based on medium to low weathering degree exposed rock foundation according to claim 1, characterized in that: The upper part of the ground pile steel pipe (4) is connected to a column steel pipe (7).

9. The photovoltaic support anchor foundation based on medium to low weathering degree exposed rock foundation according to claim 8, characterized in that: The ground pile steel pipe (4) and the column steel pipe (7) are connected by a plurality of bolts.

10. The photovoltaic support anchor foundation based on medium to low weathering degree exposed rock foundation according to claim 8, characterized in that: A base sealing rubber ring (8) is provided between the top of the ground pile steel pipe (4) and the column steel pipe (7).

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