Photovoltaic support spiral pipe pile and construction method

Abstract

The embodiment of the invention discloses a photovoltaic support spiral pipe pile and a construction method, the photovoltaic support spiral pipe pile comprises a first pile body, a first spiral blade, a second pile body and a second spiral blade, and one end of the first pile body is provided with a pile tip; the first spiral blade is arranged on the outer wall of the first pile body; the second pile body and the first pile body are coaxially arranged, the second pile body is connected to the end, away from the pile tip, of the first pile body, the second pile body is provided with a round body section and a cone section, the cone section is located between the cylindrical section and the first pile body, and the outer diameter of the cone section is gradually decreased from the end close to the cylindrical section to the end close to the first pile body. A grouting channel is formed in the middle of the second pile body, and a grouting hole communicating with the grouting channel is formed in the side wall of the second pile body; and the second spiral blade is arranged on the outer wall of the second pile body. According to the photovoltaic support spiral pipe pile, the bearing capacity of horizontal loads can be improved, and the stability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic equipment, and specifically relates to a photovoltaic support spiral pipe pile and a construction method. Background Art

[0002] When installing photovoltaic brackets, they usually need to be arranged in a spiral shape on the ground. The spiral pile has a spiral blade structure, which cuts and screws into the foundation soil through the installation torque acting on its top, forming a deep anchoring structure that can withstand upward pull, downward pressure, and horizontal loads.

[0003] In the related technology, the spiral steel pipe pile will cause the contact surface between the anchor rod and the soil to be in a state of strong disturbance and remodeling during the screwing process. The actual bearing capacity of the foundation soil is quite different from that of the original soil. The pile diameter at the top of the spiral steel pipe pile is equal to the pile diameter at the top of the blade. In the disturbed soil, the contact with the soil, especially the soil within a certain range near the surface, is poor and often becomes detached, affecting the frictional resistance between the pile body and the foundation soil. The spiral steel pipe pile has weak overall resistance to horizontal loads, which is also the main reason for the collapse and instability of photovoltaic brackets arranged in soft soil layers in mountainous areas. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a photovoltaic support spiral pipe pile, which can improve the bearing capacity of horizontal loads and improve stability.

[0006] The embodiment of the present invention also provides a photovoltaic support spiral pipe pile construction method.

[0007] The photovoltaic support spiral pipe pile of the embodiment of the present invention comprises:

[0008] A first pile body, wherein one end of the first pile body has a pile tip;

[0009] a first spiral blade, wherein the first spiral blade is arranged on an outer wall of the first pile body;

[0010] a second pile body, the second pile body being coaxially arranged with the first pile body, the second pile body being connected to an end of the first pile body away from the pile tip, the second pile body comprising a circular body section and a conical body section, the conical body section being located between the cylindrical body section and the first pile body, the outer diameter of the conical body gradually decreasing from an end close to the cylindrical body section to an end close to the first pile body, a grouting channel being provided in the middle of the second pile body, and a grouting hole being connected to the grouting channel being provided on a side wall of the second pile body;

[0011] A second spiral blade is arranged on the outer wall of the second pile body.

[0012] The photovoltaic support spiral pipe piles of the embodiment of the present invention can improve the bearing capacity of horizontal loads and improve stability.

[0013] In some embodiments, the end of the cone section close to the first pile body has an internal thread section, the end of the first pile body close to the second pile body has an external thread section, and the cone section and the first pile body are connected through the internal thread section and the external thread section.

[0014] In some embodiments, the second pile body further includes a connecting section, wherein the connecting section is located at one end of the conical section close to the first pile body, the internal thread section is disposed in the connecting section, and a locking assembly is disposed between the first pile body and the connecting section, wherein the locking assembly is used to fasten the connecting section and the first pile body to prevent the first pile body and the connecting section from moving relative to each other.

[0015] In some embodiments, the locking assembly includes a card plate, a connecting column, an inner core rod and an elastic member, the card plate is fixed to one end of the first pile body close to the second pile body, the connecting column is coaxially arranged with the first pile body and connected to the middle part of the card plate, a plurality of slots are provided on the card plate along the circumference of the connecting column, the inner core rod is provided in the slot and is movable along the extension direction of the slot, and the elastic member is provided between the inner core rod and the connecting column;

[0016] A plurality of clamping hole groups are provided on the side wall of the connecting section, and the plurality of clamping hole groups are arranged at intervals along the axial direction of the connecting section. Each clamping hole group includes a plurality of clamping holes, and the plurality of clamping holes in each clamping hole group are arranged at intervals along the circumference of the connecting section. The clamping holes are aligned and plugged with the inner core rod to limit the relative movement of the first pile body and the connecting section.

[0017] In some embodiments, the spacing distance between two adjacent groups of the card holes is 100 mm to 200 mm;

[0018] And / or, there is a phase angle between the holes in two adjacent hole groups.

[0019] In some embodiments, the outer diameter of the second spiral blade is greater than the outer diameter of the first spiral blade;

[0020] And / or, the first spiral blade is arranged along the axial direction of the first pile body, or there are a plurality of first spiral blades, and the plurality of first spiral blades are arranged at intervals on the first pile body;

[0021] It also includes a grouting conduit, which is fixed on the second spiral blade, one end of which is connected to the grouting hole, and the other end of which extends to the outer edge of the second spiral blade;

[0022] Alternatively, a flow channel is provided in the second spiral blade, one end of the flow channel is communicated with the grouting channel, and the other end of the flow channel extends to the outer edge of the second spiral blade.

[0023] In some embodiments, the length of the second pile body is 1 / 5 to 1 / 3 times the length of the second pile body, the outer diameter of the cylindrical section of the second pile body is 1.3 to 2 times the outer diameter of the first pile body, the inclination angle of the cone section is 0.8 to 1.2 times the internal friction angle of the soil layer, and the ratio of the length of the photovoltaic support spiral pipe pile to the outer diameter of the first pile body is 80 to 100.

[0024] In some embodiments, the first spiral blade and the second spiral blade are both variable diameter spiral blades, the outer diameter of the first spiral blade gradually increases from an end close to the pile tip to an end away from the pile tip, and the outer diameter of the second spiral blade gradually increases from an end close to the first pile body to an end away from the first pile body.

[0025] In some embodiments, the maximum outer diameter of the first spiral blade is 2 to 4 times the outer diameter of the first pile body, and the maximum outer diameter of the second spiral blade is 1.5 to 2.5 times the outer diameter of the cylindrical segment;

[0026] And / or, further comprising a third spiral blade, the third spiral blade being provided on the second pile body and located at one end of the second spiral blade close to the first pile body, the outer diameter of the third spiral blade being 2.5 to 3 times the outer diameter of the cylindrical section;

[0027] And / or, both the first helical blade and the second helical blade are variable pitch helical blades.

[0028] The photovoltaic support spiral pipe pile construction method according to the embodiment of the present invention comprises:

[0029] Making the photovoltaic support spiral pile described in any one of the above embodiments;

[0030] According to the stratum conditions, the photovoltaic support spiral pipe piles are assembled and the length of the photovoltaic support spiral pipe piles is adjusted;

[0031] Insert the pile tip of the photovoltaic support spiral pile into the preset position, the deviation between the center line of the photovoltaic support spiral pile and the preset position is no more than 10 mm, and perform the pile sinking operation until the upper end of the photovoltaic support spiral pile is 300 mm to 500 mm from the ground;

[0032] Connect the grouting equipment to the grouting channel and perform grouting operations until the grouting pressure reaches a first threshold or the slurry dosage exceeds a second threshold;

[0033] Tamping and leveling the foundation soil around the spiral piles of the photovoltaic support;

[0034] Carry out maintenance work until the grouting liquid solidifies. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of a spiral pipe pile of a photovoltaic support according to an embodiment of the present invention.

[0036] Figure 2 Schematic diagram of the structure of the locking assembly of an embodiment of the present invention.

[0037] Figure 3 yes Figure 2 Schematic diagram of the structure viewed from above.

[0038] Figure 4 It is a schematic diagram of a spiral pipe pile of a photovoltaic support according to another embodiment of the present invention.

[0039] Reference numerals:

[0040] 100. Photovoltaic support spiral pile;

[0041] 1. first pile body; 11. pile tip; 12. external thread section;

[0042] 2. The first spiral blade;

[0043] 3. Second pile body; 31. Cylindrical section; 32. Conical section; 33. Connecting section; 34. Grouting hole; 35. Clamp hole;

[0044] 4. second spiral blade; 41. flow channel;

[0045] 51. card plate; 52. connecting column; 53. inner core rod; 54. elastic member; 55. card slot; 56. buckle member;

[0046] 6. The third spiral blade. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0048] like Figure 1-Figure 4 As shown, the photovoltaic support spiral pipe pile 100 according to the embodiment of the present invention includes a first pile body 1, a first spiral blade 2, a second pile body 3 and a second spiral blade 4.

[0049] One end of the first pile body 1 has a pile tip 11, which is convenient for inserting into the ground and reducing the resistance of the first pile body 1 when being screwed into the ground. The first spiral blade 2 is arranged on the outer wall of the first pile body 1. The first spiral blade 2 is arranged along the axial length of the first pile body 1, or a plurality of first spiral blades 2 can be arranged at intervals in the circumferential direction of the first pile body 1. When the first pile body 1 is screwed into the ground, the first spiral blade 2 can be embedded in the soil around the first pile body 1, thereby improving the pull-out resistance and compression resistance of the first pile body 1 in the vertical direction.

[0050] The second pile body 3 is coaxially arranged with the first pile body 1, and the second pile body 3 is connected to the end of the first pile body 1 away from the pile tip 11. The second pile body 3 has a cylindrical section and a conical section 32. The outer diameter of the cylindrical section 31 is larger than the outer diameter of the first pile body 1, and the conical section 32 is located between the cylindrical section 31 and the first pile body 1. The outer diameter of the conical section 32 gradually decreases from the end close to the cylindrical section 31 to the end close to the first pile body 1. A grouting channel is provided in the middle of the second pile body 3, and a grouting hole 34 connected to the grouting channel is provided on the side wall of the second pile body 3. The second spiral blade 4 is provided on the outer wall of the second pile body 3. After the second spiral blade 4 is screwed into the ground with the second pile body 3, the stability of the second pile body 3 and the circumferential soil can be improved, and the compression resistance, pull-out resistance and horizontal load bearing capacity of the photovoltaic bracket spiral pipe pile 100 can be improved to avoid overturning and collapse during application. When the cone section 32 is screwed into the ground, it can squeeze the soil layer outward, making the surrounding soil layer denser and improving the stability between the second spiral blade 4 and the soil layer. After the photovoltaic support spiral pipe pile 100 is sunk into place, grouting is performed in the circumferential soil layer of the second pile body 3 through the grouting equipment box, which can improve the surrounding soil layer structure and improve the stability of the photovoltaic support spiral pipe pile 100. The solidified slurry can connect the soil layer and the photovoltaic support spiral pipe pile 100 as one, and when the photovoltaic support spiral pipe pile 100 is subjected to horizontal load, the stability is higher.

[0051] Optionally, in the embodiment of the present invention, the first pile body 1 and the second pile body 3 are both steel pipe piles, the first spiral blade 2 and the second spiral blade 4 are metal blades, the first spiral blade 2 is welded and fixed to the first pile body 1, and the second spiral blade 4 is welded and fixed to the second pile body 3. The first pile body 1 and the second pile body 3 can be welded and fixed together.

[0052] Optionally, in order to facilitate the diffusion of grouting slurry in the soil layer, the photovoltaic bracket spiral pipe pile 100 of the embodiment of the present invention also includes a grouting conduit, which is fixed on the second spiral blade 4, for example, by a buckle set on the second spiral blade 4. One end of the grouting conduit is connected to the grouting hole 34, and the other end of the grouting conduit extends to the outer edge of the second spiral blade 4. At this time, a part of the grouting holes 34 that are not connected to the grouting conduit can transport the grouting liquid to between adjacent second spiral blades 4, and the grouting conduit can transport the grouting liquid to the radial outside of the second spiral blade 4, thereby increasing the diffusion range of the grouting liquid and the uniformity of mixing with the soil layer, and improving the structure of the soil layer in a larger range.

[0053] Preferably, a flow channel 41 is provided in the second spiral blade 4, one end of the flow channel 41 is connected to the grouting channel, and the other end of the flow channel 41 extends to the outer edge of the second spiral blade 4. Grouting holes 34 are used to inject grout between adjacent second spiral blades 4, and the flow channel 41 is used to inject grout into the soil layer radially outside the second spiral blade 4. At this time, there is no need to lay a grouting conduit on the second spiral blade 4.

[0054] In some embodiments, the end of the cone section 32 close to the first pile body 1 has an internal thread section, and the end of the first pile body 1 close to the second pile body 3 has an external thread section 12, and the cone section 32 and the first pile body 1 are connected through the internal thread section and the external thread section 12. In other words, the first pile body 1 and the second pile body 3 are detachable connection structures, which can be made separately during production and then assembled during installation, which reduces the difficulty of production and facilitates the production of first pile bodies 1 and second pile bodies 3 of different specifications according to different needs. For example, the lengths of first pile bodies 1 of different specifications are different or the outer diameters of the first spiral blades 2 are different. For example, the outer diameters of second pile bodies 3 of different specifications are different or the outer diameters of the second spiral blades 4 are different. First pile bodies 1 and second pile bodies 3 of different specifications are selected for combination according to the soil structure of the site.

[0055] Furthermore, the second pile body 3 also includes a connecting section 33, which is located at one end of the cone section 32 close to the first pile body 1, and the internal thread section is arranged in the connecting section 33. A locking assembly is arranged between the first pile body 1 and the connecting section 33, and the locking assembly is used to fasten the connecting section 33 and the first pile body 1 to prevent the first pile body 1 and the connecting section 33 from moving relative to each other. The connecting section 33 has a certain length, which is convenient for adjusting the total length of the photovoltaic support spiral pipe pile 100 according to the length of the first pile body 1 screwed into the connecting section 33 to meet the needs of the actual soil structure. The locking assembly can fix the first pile body 1 and the connecting section 33 to prevent the two from further rotating relative to each other, and ensure the stability of the length of the assembled photovoltaic support spiral pipe pile 100.

[0056] Optionally, the locking assembly can be a fixing hole opened on the connecting section 33, and a fixing bolt is arranged in the fixing hole. When the length of the first pile body 1 screwed into the connecting section 33 reaches a preset value, the first pile body 1 is tightened by the fixing bolt to prevent the first pile body 1 from further rotating relative to the connecting section 33.

[0057] Preferably, the locking assembly includes a card plate 51, a connecting column 52, an inner core rod 53 and an elastic member 54. The card plate 51 is fixed to one end of the first pile body 1 close to the second pile body 3. The connecting column 52 is coaxially arranged with the first pile body 1 and connected to the middle part of the card plate 51. The card plate 51 is provided with a plurality of card grooves 55 along the circumference of the connecting column 52. The inner core rod 53 is arranged in the card groove 55 and is movable along the extension direction of the card groove 55. The elastic member 54 is arranged between the inner core rod 53 and the connecting column 52.

[0058] A plurality of groups of clamping holes 35 are arranged on the side wall of the connecting section 33, and the plurality of groups of clamping holes 35 are arranged at intervals along the axial direction of the connecting section 33. Each group of clamping holes 35 includes a plurality of clamping holes 35, and the plurality of clamping holes 35 in each group of clamping holes 35 are arranged at intervals along the circumference of the connecting section 33. The clamping holes 35 are aligned and plugged with the inner core rod 53 to limit the relative movement of the first pile body 1 and the connecting section 33. In the initial state, a plug can be arranged in the clamping hole 35, and the inner end of the plug is relatively flush with the inner wall of the connecting section 33. During the rotation of the first pile body 1, the inner core rod 53 compresses the elastic member 54 and retracts into the clamping groove 55. When the length of the first pile body 1 screwed into the connecting section 33 reaches a preset value, the plug at the corresponding position can be taken out. At this time, the inner core rod 53 is not constrained by the inner wall of the connecting section 33 and the plug, but extends out, thereby preventing the first pile body 1 from further rotating relative to the connecting section 33.

[0059] Optionally, a plug is not provided in the clamping hole 35, but a clamping member 56 is provided between the inner core rod 53 and the side wall of the clamping slot 55. When the connecting section 33 and the first pile body 1 are threadedly connected, the clamping member 56 restricts the inner core rod 53 from extending out of the clamping slot 55. When the connecting section 33 and the first pile body 1 are screwed into place, the clamping member 56 is removed, and the elastic member 54 pushes the inner core rod 53 to extend out of the clamping slot 55 and insert into the clamping hole 35, so as to achieve the locking and fixing of the connecting section 33 and the first pile body 1. When there are two inner core rods 53, the clamping member 56 can be U-shaped, and a through hole is provided on the side wall of the clamping slot 55, and a sink groove is provided on the side wall of the inner core rod 53. After the inner core rod 53 is retracted into the clamping slot 55, the through hole and the sink groove correspond to each other, and the end of the clamping member 56 is provided in the corresponding through hole and sink groove, so as to restrict the movement of the inner core rod 53. The two ends of the U-shaped clamping member 56 can simultaneously restrict the extension of the two inner core rods 53.

[0060] Among them, the card plate 51 is disc-shaped, the connecting column 52 is arranged in the middle of the card plate 51, the elastic member 54 is a spring, the elastic member 54 is arranged at the bottom of the card slot 55, and the inner core rod 53 is slidably arranged in the card slot 55. When the inner core rod 53 is constrained by the inner wall of the connecting section 33, the inner core rod 53 compresses the spring and retracts into the card slot 55. When the outer end of the inner core rod 53 is not constrained, the spring extends and pushes the inner core rod 53 to extend out of the card slot 55.

[0061] Furthermore, the spacing distance between two adjacent groups of card holes 35 in the embodiment of the present invention is 100 mm to 200 mm. For example, the number of the card hole 35 groups is two or three, and the spacing distance between two adjacent groups of card holes 35 can be 100 mm, 150 mm, 185 mm or 200 mm. The spacing distance between adjacent groups of card holes 35 can be determined according to the required length range of the spiral pipe pile 100 of the photovoltaic bracket.

[0062] There is a phase angle between the holes 35 in two adjacent groups of holes 35. For example, when the number of holes 35 in each group of holes 35 is two, the phase angle between the holes 35 in two adjacent groups of holes 35 is 90°. This can avoid arranging too many holes 35 on the same side of the connecting section 33, thereby improving the structural stability of the connecting section 33.

[0063] In some embodiments, the outer diameter of the second spiral blade 4 is larger than the outer diameter of the first spiral blade 2. It should be understood that due to the weak structural stability of the soil layer close to the surface, in order to improve the horizontal load bearing capacity of the photovoltaic bracket spiral pipe pile 100, the stability can be better improved by increasing the outer diameter of the second spiral blade 4.

[0064] Furthermore, the maximum outer diameter of the first spiral blade 2 is 2 to 4 times the outer diameter of the first pile body 1. When the maximum outer diameter of the first spiral blade 2 is less than 2 times the outer diameter of the first pile body 1, the first spiral blade 2 is relatively small and its structural stability with the soil layer is weak. When the maximum outer diameter of the first spiral blade 2 is greater than 4 times the outer diameter of the first pile body 1, the first spiral blade 2 is too large, which makes it difficult to screw into the ground and the manufacturing cost is too high.

[0065] The maximum outer diameter of the second spiral blade 4 is 1.5 to 2.5 times the outer diameter of the cylindrical section 31. When the maximum outer diameter of the second spiral blade 4 is less than 1.5 times the outer diameter of the second pile body 3, the second spiral blade 4 is relatively small and its structural stability with the soil layer is weak. When the maximum outer diameter of the second spiral blade 4 is greater than 2.5 times the outer diameter of the second pile body 3, the second spiral blade 4 is too large. Since the outer diameter of the second pile body 3 is larger than the outer diameter of the first pile body 1, the radial dimension of the second spiral blade 4 is too large, which is not conducive to production and operation. It is more difficult to screw into the ground, and the manufacturing cost is too high, and the practicability is poor.

[0066] The length of the second pile body 3 is 1 / 5 to 1 / 3 times the length of the second pile body 3. While ensuring that the photovoltaic support spiral pipe pile 100 is screwed into the ground to a sufficient depth, the second pile body 3 and the soil layer also have a sufficient depth of contact, and at the same time, the length of the second pile body 3 is too long, which increases the difficulty of screwing into the soil layer. The outer diameter of the cylindrical section 31 of the second pile body 3 is 1.3 to 2 times the outer diameter of the first pile body 1. When the outer diameter of the second pile body 3 is less than 1.3 times the outer diameter of the first pile body 1, it cannot play a role in resisting horizontal loads. When the outer diameter of the second pile body 3 is greater than 2 times the outer diameter of the first pile body 1, it will increase the construction difficulty of the second pile body 3 screwing into the soil layer, affecting the construction quality. The inclination angle of the cone section 32 is 0.8 to 1.2 times the internal friction angle of the soil layer. Preferably, the inclination angle of the cone section 32 is the same as the internal friction angle of the soil layer. The ratio of the length of the photovoltaic support spiral pipe pile 100 to the outer diameter of the first pile body 1 is 80 to 100. By limiting the outer diameter and length of the first pile body 1 and the second pile body 3, the first pile body 1 and the second pile body 3 can fully play their respective roles, ensure the smooth progress of the construction work, and improve the tensile strength, compressive strength and horizontal load bearing capacity of the photovoltaic bracket spiral pipe pile 100.

[0067] Furthermore, the first spiral blade 2 and the second spiral blade 4 are both variable diameter spiral blades. The outer diameter of the first spiral blade 2 gradually increases from the end close to the pile tip 11 to the end away from the pile tip 11, and the outer diameter of the second spiral blade 4 gradually increases from the end close to the first pile body 1 to the end away from the first pile body 1.

[0068] At the same time, the photovoltaic support spiral pipe pile 100 also includes a third spiral blade 6, which is arranged on the second pile body 3 and is located at one end of the second spiral blade 4 close to the first pile body 1. The outer diameter of the third spiral blade 6 is larger than the outer diameter of the second spiral blade 4 and the outer diameter of the first spiral blade 2. The outer diameter of the third spiral blade 6 is 2.5 to 3 times the outer diameter of the cylindrical section 31. The axial size of the third spiral blade 6 in the photovoltaic support spiral pipe pile 100 is small, for example, the third spiral blade 6 is one or two circles.

[0069] In the first spiral blade 2, the second spiral blade 4 and the third spiral blade 6, the pitch of the spiral is related to the diameter of the spiral blade, and the pitch is usually 2-3 times the outer diameter of the spiral blade. When the pitch is too small, the soil layer between the spiral blades is easily too dense when screwing in, and the photovoltaic bracket spiral pipe pile 100 is difficult to screw in. When the pitch is too large, it is not easy for the spiral blades and the soil layer to be effectively and closely contacted, affecting the overall stability.

[0070] Of course, the first spiral blade 2 and the second spiral blade 4 can also be set as variable pitch spiral blades. According to the test of the photovoltaic support spiral pipe pile 100 being screwed into the soil layer, the pitch of different sections of the first spiral blade 2 and the second spiral blade 4 can be determined to improve the density of the soil layer between the spiral blades and the supporting effect of the coating on the photovoltaic support spiral pipe pile 100.

[0071] The photovoltaic support spiral pipe pile construction method according to the embodiment of the present invention comprises:

[0072] S101, manufacturing the spiral piles of the photovoltaic support in any of the above embodiments.

[0073] S102, assembling the photovoltaic support spiral pipe piles according to the ground conditions, and adjusting the length of the photovoltaic support spiral pipe piles. For example, when the ground is a soft soil layer, the length of the photovoltaic support spiral pipe piles can be increased, and when the ground is hard, the length of the photovoltaic support spiral pipe piles can be reduced.

[0074] S103, insert the pile tip of the photovoltaic support spiral pile into the preset position, the deviation between the center line of the photovoltaic support spiral pile and the preset position is no more than 10mm, and the pile sinking operation is performed until the upper end of the photovoltaic support spiral pile is 300mm to 500mm from the ground. Ensure the accuracy of the position of the photovoltaic support spiral pile, and at the same time ensure that the top of the photovoltaic support spiral pile is relatively consistent with the ground, so as to facilitate the installation of photovoltaic panels.

[0075] S104, connecting the grouting equipment to the grouting channel, and performing grouting operations until the grouting pressure reaches a first threshold or the slurry dosage exceeds a second threshold, so as to ensure the structural stability of the soil after transformation.

[0076] S105. Tamping and leveling the foundation soil around the spiral pipe piles of the photovoltaic support. During the tamping process, the soil layer after grouting is further compacted to ensure good density after the slurry solidifies and good ground flatness, which is convenient for subsequent operations.

[0077] S106, perform maintenance work until the grouting liquid solidifies, and perform certain maintenance work according to the solidification cycle of the grouting liquid, such as sprinkling water to keep it moist, keeping it warm, and taking sun protection measures to improve the solidification effect.

[0078] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present invention.

[0079] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0080] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0082] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0083] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A photovoltaic support spiral pipe pile, characterized in that: include: A first pile body, wherein one end of the first pile body has a pile tip; a first spiral blade, wherein the first spiral blade is arranged on an outer wall of the first pile body; a second pile body, the second pile body being coaxially arranged with the first pile body, the second pile body being connected to an end of the first pile body away from the pile tip, the second pile body comprising a circular body section and a conical body section, the conical body section being located between the cylindrical body section and the first pile body, the outer diameter of the conical body gradually decreasing from an end close to the cylindrical body section to an end close to the first pile body, a grouting channel being provided in the middle of the second pile body, and a grouting hole being connected to the grouting channel being provided on a side wall of the second pile body; A second spiral blade is arranged on the outer wall of the second pile body.

2. The photovoltaic support spiral pipe pile according to claim 1, characterized in that: The end of the cone section close to the first pile body has an internal thread section, the end of the first pile body close to the second pile body has an external thread section, and the cone section and the first pile body are connected via the internal thread section and the external thread section.

3. The photovoltaic support spiral pipe pile according to claim 2, characterized in that: The second pile body also includes a connecting section, which is located at one end of the cone section close to the first pile body. The internal thread section is arranged in the connecting section. A locking assembly is provided between the first pile body and the connecting section, and the locking assembly is used to fasten the connecting section and the first pile body to prevent the first pile body and the connecting section from moving relative to each other.

4. The photovoltaic support spiral pipe pile according to claim 3, characterized in that: The locking assembly includes a card plate, a connecting column, an inner core rod and an elastic member, wherein the card plate is fixed to one end of the first pile body close to the second pile body, the connecting column is coaxially arranged with the first pile body and connected to the middle part of the card plate, a plurality of slots are arranged on the card plate along the circumference of the connecting column, the inner core rod is arranged in the slot and can move along the extension direction of the slot, and the elastic member is arranged between the inner core rod and the connecting column; A plurality of clamping hole groups are provided on the side wall of the connecting section, and the plurality of clamping hole groups are arranged at intervals along the axial direction of the connecting section. Each clamping hole group includes a plurality of clamping holes, and the plurality of clamping holes in each clamping hole group are arranged at intervals along the circumference of the connecting section. The clamping holes are aligned and plugged with the inner core rod to limit the relative movement of the first pile body and the connecting section.

5. The photovoltaic support spiral pipe pile according to claim 4, characterized in that: The spacing between two adjacent groups of the card holes is 100 mm to 200 mm; And / or, there is a phase angle between the holes in two adjacent hole groups.

6. The photovoltaic support spiral pipe pile according to claim 1, characterized in that: The outer diameter of the second spiral blade is greater than the outer diameter of the first spiral blade; And / or, the first spiral blade is arranged along the axial direction of the first pile body, or there are a plurality of first spiral blades, and the plurality of first spiral blades are arranged at intervals on the first pile body; It also includes a grouting conduit, which is fixed on the second spiral blade, one end of which is connected to the grouting hole, and the other end of which extends to the outer edge of the second spiral blade; Alternatively, a flow channel is provided in the second spiral blade, one end of the flow channel is communicated with the grouting channel, and the other end of the flow channel extends to the outer edge of the second spiral blade.

7. The photovoltaic support spiral pipe pile according to any one of claims 1 to 6, characterized in that: The length of the second pile body is 1 / 5 to 1 / 3 times the length of the second pile body, the outer diameter of the cylindrical section of the second pile body is 1.3 to 2 times the outer diameter of the first pile body, the inclination angle of the cone section is 0.8 to 1.2 times the internal friction angle of the soil layer, and the ratio of the length of the photovoltaic support spiral pipe pile to the outer diameter of the first pile body is 80 to 100.

8. The photovoltaic support spiral pipe pile according to claim 7, characterized in that: The first spiral blade and the second spiral blade are both variable diameter spiral blades. The outer diameter of the first spiral blade gradually increases from an end close to the pile tip to an end away from the pile tip, and the outer diameter of the second spiral blade gradually increases from an end close to the first pile body to an end away from the first pile body.

9. The photovoltaic support spiral pipe pile according to claim 8, characterized in that: The maximum outer diameter of the first spiral blade is 2 to 4 times the outer diameter of the first pile body, and the maximum outer diameter of the second spiral blade is 1.5 to 2.5 times the outer diameter of the cylindrical section; And / or, further comprising a third spiral blade, the third spiral blade being provided on the second pile body and located at one end of the second spiral blade close to the first pile body, the outer diameter of the third spiral blade being 2.5 to 3 times the outer diameter of the cylindrical section; And / or, both the first helical blade and the second helical blade are variable pitch helical blades.

10. A photovoltaic support spiral pipe pile construction method, characterized in that: include: Making a photovoltaic support spiral pipe pile as claimed in any one of claims 1 to 9; According to the stratum conditions, the photovoltaic support spiral pipe piles are assembled and the length of the photovoltaic support spiral pipe piles is adjusted; Insert the pile tip of the photovoltaic support spiral pile into the preset position, the deviation between the center line of the photovoltaic support spiral pile and the preset position is no more than 10 mm, and perform the pile sinking operation until the upper end of the photovoltaic support spiral pile is 300 mm to 500 mm from the ground; Connect the grouting equipment to the grouting channel and perform grouting operations until the grouting pressure reaches a first threshold or the slurry dosage exceeds a second threshold; Tamping and leveling the foundation soil around the spiral piles of the photovoltaic support; Carry out maintenance work until the grouting liquid solidifies.

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