Cast-in-place screw pile and photovoltaic support

Abstract

The utility model relates to the technical field of photovoltaic supports, and discloses a cast-in-place screw pile and a photovoltaic support, which are used for solving the problem that an existing foundation pile is poor in bearing capacity in the horizontal direction, the cast-in-place screw pile comprises a pile body, and a spiral piece spirally extending in the axial direction of the pile body is arranged on the outer side of at least part of the section of the pile body. Concrete is poured into the periphery of the section, provided with the spiral piece, of the pile body, and the spiral piece is poured into the concrete. By pouring concrete, the concrete, the spiral piece and the pile body are integrated, the outer diameter of the section, provided with the spiral piece, of the pile body can be increased, and therefore the horizontal bearing capacity of the pile body is improved, and the damage resistance of the pile body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic brackets, in particular to a cast-in-place spiral pile and a photovoltaic bracket. Background Art

[0002] As an important support for clean energy, ground-based solar power stations have been rapidly developed. Choosing to build solar power stations in desert areas can not only effectively develop clean energy, but also play a role in sand control. Since the soil in desert areas is loose, mostly fine sand layers, and the site is uneven, it is often necessary to level the site to adapt to the installation of ground photovoltaic brackets. The fine sand layer and the disturbed site surface soil layer have a low natural horizontal resistance coefficient. The horizontal bearing capacity of conventional small-diameter spiral steel pipe piles is low and it is difficult to meet the design bearing capacity requirements. Under this geological condition, the more economical spiral steel pipe piles are no longer applicable and can only be changed to microporous cast-in-place concrete piles.

[0003] Although microporous cast-in-place piles can effectively improve the horizontal bearing capacity, there are many inconveniences in the foundation construction process. The pre-expansion process requires a large amount of construction water and wet concrete pouring of the foundation, which will also increase the overall economic cost. Utility Model Content

[0004] The utility model aims to provide a cast-in-place spiral pile and a photovoltaic support, which can effectively improve the horizontal bearing capacity and thus improve the anti-destruction ability.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A cast-in-place screw pile comprises a pile body, wherein at least part of the sections of the pile body are provided with a screw extending spirally along the axial direction thereof, and the outer periphery of the section of the pile body provided with the screw is poured with concrete, and the concrete pours the screw into the interior thereof.

[0007] In some embodiments, the spiral member is a spiral strip, and both ends of the spiral strip are fixed to the pile body.

[0008] In some embodiments, there is a preset distance between the main body of the spiral strip and the outer side surface of the pile body.

[0009] In some embodiments, two ends of the spiral strip are respectively provided with bent ends, and the bent ends are fixed on the pile body.

[0010] In some embodiments, the spiral member is disposed on the pile body near its upper end.

[0011] In some embodiments, the outer diameter of the concrete is greater than the outer diameter of the screw, and the length of the concrete is greater than the axial length of the screw.

[0012] In some embodiments, shear nails are also provided on the periphery of the section of the pile body where the spiral member is provided, and the shear nails are poured into the concrete.

[0013] In some embodiments, a spiral blade is disposed on the outer side of at least a portion of the sections on the pile body, the spiral element and the spiral blade are distributed along the axial direction of the pile body, and the spiral blade is located below the spiral element.

[0014] In some embodiments, a plurality of the spiral blades are disposed on the pile body and are spaced apart from each other.

[0015] A photovoltaic support comprises any one of the cast-in-place screw piles described above.

[0016] Compared with the prior art, the above technical solution has the following advantages:

[0017] The utility model provides a cast-in-place spiral pile and a photovoltaic support. Since a spiral component extending spirally along the axial direction is provided on the outer side of at least part of the section of the pile body, compared with the existing bare-rod pile body, the outer diameter of the pile body is increased by pouring concrete, and the bonding ability between the pile body and concrete can be increased by the spiral component, thereby improving the horizontal bearing capacity of the pile body and further improving its anti-destruction ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the main structure of a cast-in-place screw pile provided by a specific embodiment of the utility model;

[0020] Figure 2 for Figure 1 AA section view in the figure;

[0021] Figure 3 for Figure 1 BB section view in.

[0022] The reference numerals are as follows:

[0023] 1 is the pile body, 2 is the spiral member, 21 is the bent end, 3 is concrete, 4 is the spiral blade, and 5 is the ground. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Please refer to Figure 1 The utility model provides a cast-in-place screw pile, comprising: a pile body 1, the pile body 1 is preferably a round tube, the material is preferably a steel tube, and a square tube or a tubular structure of other cross-sectional shapes can also be selected. In addition, the pile body 1 can also select a solid column structure, wherein at least a portion of the outer section of the pile body 1 is provided with a spiral member 2 extending spirally along its axial direction, for example, the spiral member 2 can be provided at a weak part of the pile body 1, or the spiral member 2 can be provided on the outer side of the entire length of the pile body 1, and the fixed position of the spiral member 2 can be selected according to actual needs, wherein the spiral member 2 can be welded to the outer side of the pile body 1, or fixed to the pile body 1 by other means, and the outer periphery of the section of the pile body 1 provided with the spiral member 2 is poured with concrete 3, and the concrete 3 pours the spiral member 2 inside, and the concrete 3 can be selected as C30 fine stone concrete, and the maximum particle size of the coarse aggregate is not greater than 15mm. By pouring concrete 3, the outer diameter of the pile body 1 is increased, and the combination ability of the pile body 1 and the concrete 3 can be increased by the spiral member 2, thereby improving the horizontal bearing capacity of the pile body 1, and then improving its anti-destruction ability. The utility model provides cast-in-place spiral piles suitable for double-column photovoltaic brackets. The pile foundation spacing can be selected between 3.5 meters and 4 meters. There is no need to reduce the photovoltaic bracket spacing. Since the angle of photovoltaic modules in desert areas is relatively high, this method can reduce the steel content of the bracket and at the same time meet the pile foundation bearing capacity requirements under most geological conditions.

[0026] In some embodiments, the spiral member 2 is a spiral bar, for example, a steel bar can be spirally formed into a stirrup, wherein an 8 mm steel bar can be used, the stirrup spacing is 200 mm, the stirrup diameter is 300 mm, and both ends of the spiral bar are fixed to the pile body 1, for example, the two ends of the spiral bar can be welded to the pile body 1, and the spiral bar is spirally wound around the outside of the pile body 1 along the axial direction of the pile body 1.

[0027] In some embodiments, please refer to Figure 2 There is a preset distance between the main body of the spiral strip and the outer side of the pile body 1, that is, there is a gap between the spiral strip and the pile body 1, which can facilitate the flow of concrete 3 from top to bottom during pouring. The two ends of the spiral strip are respectively provided with bent ends 21, which are fixed on the pile body 1. The bent ends 21 can be welded to the pile body 1 by double-sided fillet welds, and the welding length can be selected to be 40 mm.

[0028] In some embodiments, Figure 1As shown, the spiral member 2 is arranged on the pile body 1 near its upper end, and the spiral member 2 can be fixed at a certain distance from the upper end of the pile body 1. In a specific application scenario, the height of the concrete 3 is higher than the ground 5, and the height of the spiral member 2 is not higher than the ground 5, that is, the concrete 3 is exposed above the ground 5, and the spiral member 2 is buried below the ground 5. Figure 1 and Figure 2 As shown, the outer diameter of the concrete 3 is greater than the outer diameter of the screw 2, the length of the concrete 3 is greater than the axial length of the screw 2, the screw 2 is completely poured into the concrete 3, and the structure of the poured concrete 3 can be selected as a cylindrical structure.

[0029] In some embodiments, the outer circumference of the section of the pile body 1 where the spiral member 2 is provided is also provided with shear nails. For example, a plurality of shear nails distributed along the circumferential direction may be provided on the outer circumference of the pile body 1. Specifically, the shear nails may be radially distributed on the outer circumference of the pile body 1, that is, the shear nails extend along the radial direction of the pile body 1. In addition, the extension direction of the shear nails may also have an angle with the radial direction of the pile body 1. The plurality of shear nails may be evenly distributed along the circumferential direction of the pile body 1, or may be spirally distributed around the pile body 1. Alternatively, a plurality of circles of shear nails distributed along the axial direction of the pile body 1 may be provided on the outer circumference of the pile body 1, and the adjacent circles of shear nails are staggered, that is, in the top projection of the pile body 1, the adjacent circles of shear nails do not overlap. In addition, the shear nails may be provided at a preset angle to the axial direction of the pile body 1, for example, the end of the shear nail away from the pile body 1 may be tilted upward or downward. The shear nails may be fixed to the outer circumference of the pile body 1 by welding. During construction, the shear nails are poured into the concrete 3. The structural strength of the concrete 3 can be further improved by the shear nails and the spiral member 2. When a plurality of shear nails are spirally distributed along the axial direction of the pile body 1, or when the shear nails are located on the spiral track of the spiral member 2, the body of the spiral member 2 can also be fixed on the shear nails, for example, the spiral member 2 and the shear nails can be fixed by tying or welding to improve the connection stability of the spiral member 2, thereby preventing the spiral member 2 from being excessively deformed or even separated from the pile body 1 due to the impact force of the concrete 3 when pouring the concrete 3.

[0030] In some embodiments, Figure 3 As shown, at least part of the sections on the pile body 1 are provided with spiral blades 4 on the outside, the spiral member 2 and the spiral blades 4 are distributed along the axial direction of the pile body 1, and the spiral blades 4 are located below the spiral member 2. The spiral blades 4 are mainly used to screw the pile body 1 into the foundation. In order to improve the screwing effect of the pile body 1, a plurality of spiral blades 4 distributed at intervals can be provided on the pile body 1, such as Figure 1As shown, the lower section of the pile body 1 is provided with two spiral blades 4. Through the multiple spiral blades 4 distributed at intervals, the screwing operation of the pile body 1 can be realized, and the use of the spiral blades 4 can be saved, thereby reducing its material cost. In addition, the cross-section of the pile body 1 can also be different. For example, the cross-section of the section of the pile body 1 provided with the spiral member 2 can be a polygon, such as a triangle or a rectangle, or other polygonal structures. Because the pile body needs to be drilled in a set area on the ground before piling, the diameter of the hole is larger than the diameter of the spiral member 2 in the top view direction, and the length of the hole is not less than the axial length of the spiral member 2. When the pile body 1 is installed, the bottom of the pile body 1 will continue to extend downward from the bottom of the hole. During the extension process, the spiral member 2 will not be subject to the resistance of the soil. Therefore, the cross-section of the section of the pile body 1 provided with the spiral member 2 can be set to a polygon. The cross-section of the section on the pile body 1 where the spiral blades 4 are arranged is circular. The purpose of such arrangement is that the polygonal cross-sectional structure can improve the connection effect between the pile body 1 and the concrete 3, and the circular cross-sectional structure can reduce the resistance of the pile body 1 when it is screwed into the foundation, thereby improving the construction efficiency.

[0031] In order to further improve the bearing capacity and anti-destruction ability of the pile body 1, in this embodiment, a plurality of spiral strips can be arranged on the outside of the pile body 1, and the rotation directions of the plurality of spiral strips can be the same or different. Two spiral strips with opposite rotation directions can be arranged on the outside of the pile body 1, one being left-handed and the other being right-handed. Please refer to Figure 1 , a right-handed spiral strip is provided on the outside of the pile body 1, which can be Figure 1 On the basis of, a left-handed spiral strip is added to reinforce the concrete 3 in the axial direction; in addition, the lengths of the multiple spiral strips can be the same or different; in addition, the diameters of the multiple spiral strips in the top view direction can be the same or different, please refer to Figure 2 On the basis of the original spiral strips, one or more spiral strips can be added on the inner or outer side to reinforce the concrete 3 in the radial direction. How to select spiral strips of different sizes and directions for combination can be selected according to needs.

[0032] In summary, the construction process of a cast-in-place screw pile provided by the embodiment of the utility model is as follows:

[0033] 1. Use a drilling machine to drill a hole in the ground 5. The hole is used for local pouring of concrete 3. The diameter and depth of the hole are determined according to the design value;

[0034] 2. The pile driver fixes the spiral pile through the spiral drill and locates the spiral pile at the center of the lead hole;

[0035] 3. According to the depth requirements of geological survey, piles are gradually driven downward until the required depth is reached;

[0036] 4. During the piling process, adjust the verticality and direction of the spiral pile as needed, which can be achieved by adjusting the operation of the excavator;

[0037] 5. When the screw pile reaches the required depth, stop piling and remove the auger from the screw pile;

[0038] 6. Pour the pre-mixed fine stone concrete into the gap between the screw pile and the guide hole in sequence;

[0039] 7. When the fine stone concrete is poured to a certain height, perform machine vibration operation;

[0040] 8. During the pouring process, vibrate the concrete in sequence to ensure that the fine stone concrete is dense and has no voids;

[0041] 9. A round tube of a certain height is set at the part 5 above the ground as a mold for pouring concrete, which can effectively isolate the contact between the soil and the steel pipe pile, thereby improving the anti-corrosion performance. The height of the round tube is preferably 0.1m, and other heights can also be selected, which can be selected according to actual needs.

[0042] The present utility model also provides a photovoltaic support, including the cast screw pile provided by any of the above embodiments, wherein a joint can be provided at the upper end of the cast screw pile to facilitate connection with the photovoltaic module, and the joint can be a snap-on structure or a bolt and mounting hole structure, or a connection structure combining the two. In a specific application, the photovoltaic support can include a plurality of cast screw piles, and the spacing of the cast spirals can be adjusted according to actual needs. The beneficial effects of the photovoltaic support can be referred to the cast screw piles, which will not be repeated here.

[0043] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0044] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0045] The above is a detailed introduction to a cast-in-place screw pile and a photovoltaic bracket provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A cast-in-place screw pile, characterized in that: include: A pile body (1), wherein a spiral member (2) extending spirally in an axial direction is provided on the outside of at least a portion of the sections of the pile body (1), and concrete (3) is poured on the periphery of the section of the pile body (1) where the spiral member (2) is provided, and the concrete (3) pours the spiral member (2) inside the section, and spiral blades (4) are provided on the outside of at least a portion of the sections of the pile body (1), and the spiral member (2) and the spiral blades (4) are distributed in the axial direction of the pile body (1), and the spiral blades (4) are located below the spiral member (2).

2. The cast-in-place screw pile according to claim 1, characterized in that: The spiral member (2) is a spiral strip, and both ends of the spiral strip are fixed on the pile body (1).

3. The cast-in-place screw pile according to claim 2, characterized in that: There is a preset distance between the main body of the spiral strip and the outer side surface of the pile body (1).

4. The cast-in-place screw pile according to claim 3, characterized in that: The two ends of the spiral strip are respectively provided with bent ends (21), and the bent ends (21) are fixed on the pile body (1).

5. The cast-in-place screw pile according to claim 1, characterized in that: The spiral member (2) is arranged on the pile body (1) at a position close to the upper end thereof.

6. The cast-in-place screw pile according to claim 1, characterized in that: The outer diameter of the concrete (3) is greater than the outer diameter of the screw (2), and the length of the concrete (3) is greater than the axial length of the screw (2).

7. The cast-in-place screw pile according to claim 1, characterized in that: The outer periphery of the section of the pile body (1) where the spiral member (2) is provided is also provided with shear nails, and the shear nails are poured into the concrete (3).

8. The cast-in-place screw pile according to claim 1, characterized in that: The pile body (1) is provided with a plurality of spiral blades (4) distributed at intervals.

9. A photovoltaic support, characterized in that: The invention comprises the cast-in-place screw pile according to any one of claims 1 to 8.

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