CN115467324A - Photovoltaic support screw pile with vertical fins and using method - Google Patents

Abstract

The present invention provides a photovoltaic support screw pile with vertical fins and its use method. The screw pile includes a steel sleeve, a steel pipe for a spiral steel pile, blades for a spiral steel pile, a vertical stop ring and a plurality of vertical fins , the steel pipe of the spiral steel pile is provided with a plurality of spiral steel pile blades along the length direction, a steel casing is arranged between two adjacent spiral steel pile blades, and the plurality of vertical fins are arranged on On the outer wall of the steel casing, the upper and lower ends of the steel casing are provided with vertical limit gear rings, and the steel sleeve and the vertical limit gear rings are both sleeved outside the steel pipe of the spiral steel pile. In the present invention, a set of limit gears are set on the spiral steel pile steel pipes above and below the steel casing welded with vertical fins, which is not only beneficial for pressing in when piles are formed, but also for pulling out when pulling out piles, and the overall construction is simple and easy Row. The invention increases the horizontal bearing capacity of the spiral steel pile by adding a plurality of vertical fins to the lower part of the steel pipe of the spiral steel pile, and achieves the purpose of reducing the pile length.

Description

A photovoltaic support screw pile with vertical fins and its use method

technical field

The invention belongs to the technical field of civil engineering, and in particular relates to a photovoltaic support screw pile with vertical fins and a use method.

Background technique

China has a vast desert area, rich solar energy resources, and centralized ground photovoltaic power plants with high power generation efficiency. In aeolian sandy sites in desert areas, the shading effect of solar photovoltaic panels and the water used to clean solar photovoltaic panels can increase the water required for plant growth and create conditions for the growth of shade-tolerant plants. Photovoltaic panels covering a large area will absorb solar radiation and convert it into electrical energy, reducing a large amount of direct solar radiation on the surface, which is conducive to transforming and consuming the power source of sandstorms in desert areas. Photovoltaic arrays have the function of mechanical sand barriers to block wind and sand, and can suppress and reduce the frequency and intensity of sandstorms. The centralized ground photovoltaic power station built in the desert area has the effect of cooling and humidifying the local microclimate, which is conducive to improving the ecological environment of the desert. Using the idle large desert to build a centralized ground photovoltaic power station has good economic and ecological benefits.

In the construction of a centralized ground photovoltaic power station in the desert, in the construction of a centralized ground photovoltaic power station in a desert area, it is inevitable to encounter the special foundation of aeolian sand. In this environment, compared with the traditional reinforced concrete pile foundation, the spiral steel pile has the advantages of fast construction speed, saving investment, small environmental impact, and can be dismantled and recycled.

As far as foundation conditions are concerned, the loose microstructure of aeolian sand results in low foundation bearing capacity and poor restraint on piles. As far as the mechanical characteristics of the photovoltaic support pile foundation are concerned, the horizontal force and uplift force transmitted from the upper structure are relatively large, and the vertical downward pressure is relatively small.

The existing spiral steel pile is not conducive to fully exerting the material properties of the pile body steel. The bearing capacity and anti-deformation capacity obtained by the interaction between the pile and the soil are determined by the strength of the surrounding soil and the shape characteristics of the pile. On the one hand, due to the loose structure of aeolian sand, compared with the steel strength of the pile, the force on the pile itself is relatively small, and the use efficiency of the pile material is low. On the other hand, considering the shape characteristics of the pile, the projection of the spiral fins of the spiral steel pile in the vertical direction of the pile is very large, which is the cross-sectional area of the pile and the plane projection of the spiral fins. In contrast, the lateral or horizontal projection of the pile is very small, consisting of the sides of the middle steel tube of the pile and the thickness of the helical fins. The projected area determines the force area. The vertical projection is large, and the spiral steel pile has strong resistance to vertical force compression and pullout; the lateral projection is small, and the horizontal force resistance is poor. In engineering, the method of increasing pile length or pile diameter is generally used to improve the horizontal force resistance of piles, and the use efficiency of pile materials is low.

Contents of the invention

In order to overcome the existing problems of excessively long piles and poor horizontal force resistance, the present invention provides a photovoltaic support screw pile with vertical fins and its use method. The fins and the vertical limit gear ring improve the horizontal bearing capacity of the spiral steel pile and reduce the displacement of the pile top under the horizontal load. The purpose of reducing the pile length can be achieved, the construction cost is reduced, and the economy is improved.

The technical scheme adopted in the present invention is:

A photovoltaic support screw pile with vertical fins, including steel casing, spiral steel pile steel pipe, spiral steel pile blade, vertical limit stop ring and a plurality of vertical fins, the spiral steel pile steel pipe A plurality of spiral steel pile blades are arranged along the length direction, a steel casing is arranged between two adjacent spiral steel pile blades, and the plurality of vertical fins are arranged on the outer wall of the steel casing. The upper and lower ends of the steel casing are provided with vertical limit gear rings, and the steel sleeve and the vertical limit gear rings are both sleeved outside the steel pipe of the spiral steel pile.

The vertical limit gear ring is pasted and welded on the outer wall of the steel pipe of the spiral steel pile through a short steel bar.

The short steel bars are circular or three-segment anti-helical around the steel pipe of the spiral steel pile.

When the short steel bars are three-segment anti-helical, the helical direction is opposite to the rotation direction of the spiral steel pile blades; the three-segment anti-helical short steel bars are in three-point contact with the edge of the corresponding steel casing nozzle.

The spiral directions of the plurality of spiral steel pile blades are consistent.

The plurality of vertical fins are evenly distributed on the circumferential side wall of the steel casing.

The vertical fins are rectangular or trapezoidal, and the upper end of the vertical fins in the trapezoidal shape is longer than the lower end.

The length of the vertical fins is the same as that of the steel casing; the length of the vertical fins extending radially from the steel casing is 50-150mm.

The length of the steel casing is 100-300mm.

A method for using a photovoltaic support screw pile with vertical fins. The specific steps are: Step 1: Make a screw pile, and connect a steel sleeve welded with vertical fins to a spiral pile with multiple spiral steel pile blades. The design position of the lower part of the steel pipe of the steel pile, and then weld the vertical limit gear ring at the upper and lower ends of the steel casing to complete the screw pile;

Step 2: Determine the center position of the spiral steel pile steel pipe on the ground;

Step 3: Pile into a pile, insert the lower end of the spiral steel pipe steel pipe of the spiral pile made in step 1 into the foundation surface around the pile at the center position positioned in step 2, and then screw the spiral pile made in step 1 into the foundation , when the pile top of the screw pile reaches the designed elevation, the pile is completed;

Step 4: Sprinkle water to compact and level the surface of the foundation around the pile so that the surface of the foundation around the pile is higher than the surrounding ground.

The beneficial effects of the present invention are:

(1) The present invention increases the horizontal bearing capacity of the spiral steel pile by adding a plurality of vertical fins to the lower part of the steel pipe of the spiral steel pile, and reduces the pile top displacement under horizontal load. The purpose of reducing the pile length can be achieved. The pile length is reduced, material is saved, cost is reduced and economy is improved.

(2) The overall structure of the present invention is simple in structure and convenient in construction. After the pile length is shortened, the process of pile formation is accelerated, the engineering efficiency is improved, and the engineering progress is accelerated.

(3) In the present invention, a set of limit gears are respectively set on the steel pipes above and below the steel sleeves welded with vertical fins, which are not only conducive to pressing in when forming piles, but also beneficial to pulling out when pulling out piles. The construction is simple and easy.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the contents of the description, the following is a detailed description of the preferred embodiments of the present invention with accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the structure of the three-section vertical limit ring of the present invention.

Fig. 3 is a schematic top view of two vertical fins of the present invention.

Fig. 4 is a schematic top view of three vertical fins of the present invention.

Fig. 5 is a schematic top view of four vertical fins of the present invention.

In the figure, reference signs are: 1-vertical fin; 2-steel casing; 3-spiral steel pile steel pipe; 4-spiral steel pile blade; 5-vertical limit ring; 6, foundation surface around the pile.

detailed description

Example 1:

In order to overcome the existing problems of too long pile length and poor horizontal force resistance, the present invention provides a photovoltaic support screw pile with vertical fins as shown in Figure 1-5 and its use method. The vertical fins and the vertical stop ring added to the lower part of the steel pipe of the steel pile increase the horizontal bearing capacity of the spiral steel pile and reduce the displacement of the pile top under the horizontal load. The purpose of reducing the pile length can be achieved, the construction cost is reduced, and the economy is improved.

A photovoltaic support screw pile with vertical fins, including steel casing 2, spiral steel pile steel pipe 3, spiral steel pile blade 4, vertical limit stop ring 5 and a plurality of vertical fins 1, the described The spiral steel pile steel pipe 3 is provided with a plurality of spiral steel pile blades 4 along the length direction, and a steel casing 2 is arranged between two adjacent spiral steel pile blades 4, and the plurality of vertical fins 1 are set On the outer wall of the steel sleeve 2, the upper and lower ends of the steel sleeve 2 are provided with vertical limit gear rings 5, and the steel sleeve 2 and the vertical limit gear ring 5 are both sleeved on the spiral Steel pile steel pipe 3 outside.

In the present invention, the steel casing 2 only needs to be located between two adjacent spiral steel pile blades 4 . The quantity and position of the steel sleeves 2 are sleeved on the spiral steel pile steel pipe 3 according to requirements. A plurality of vertical fins 1 are evenly distributed along the circumferential direction on the outer wall of the steel casing 2 to ensure the strength of the corresponding position on the corresponding spiral steel pile steel pipe 3 .

As shown in FIG. 1 , there is one steel casing 2 , which is arranged between the two spiral steel pile blades 4 at the lowermost end. In the present invention, the length of the steel casing 2 and the size of the vertical fins 1 can be properly adjusted according to the force requirements of the pile. In the present invention, a group of vertical limit gear rings 5 are welded on the spiral steel pile steel pipes 3 above and below the vertical fins 1 to limit the sliding of the steel casing 2 up and down along the spiral steel pile steel pipe 3 .

As shown in Figure 1, the present invention adds a vertical fin 1 to the lower part of the steel pipe 3 of the spiral steel pile. By increasing the horizontal projected area of the lower part of the spiral pile, the shape characteristics of the spiral pile in the horizontal direction are changed, which is beneficial to the pile receiving When the horizontal force is applied, the lower part of the pile transmits the horizontal load directly from the vertical fin 1 to the soil around the pile, which increases the ability of the pile to resist horizontal force and improves the use efficiency of materials. The present invention is applicable to the foundation of photovoltaic supports, small and medium-sized equipment foundations, container module buildings and foundations of overhead line iron towers in wind-blown sandy sites in desert areas. It can also be applied to collapsible loess, silt and other sites.

When the screw pile provided by the present invention is screwed into the foundation soil and reversely rotated to pull out the pile through the piling equipment, the vertical fin 1 at the bottom of the steel pipe 3 of the spiral steel pile is under the action of the vertical limit stop ring 5, and the screw pile Drive into foundation or pull out. Adopting the present invention in the wind-blown sand area can improve the horizontal bearing capacity and reduce the horizontal displacement of the spiral steel pile, improve the anti-overturning ability of the photovoltaic support, and reduce the pile length. The invention saves investment, is convenient and fast in construction, has little environmental impact, and is environmentally friendly and recyclable. It is suitable for photovoltaic support foundations, small and medium-sized equipment foundations, container module buildings, and overhead line tower foundations in wind-blown sandy sites in desert areas, and can also be used in geological conditions such as collapsible loess and silt. For the reinforcement of the existing support pile foundation, the steel casing 2 of the vertical fin 1 can be divided into two halves. On the steel pipe 3 of the spiral steel pile, the steel casing 2 is closed by hoops or bolts.

The invention embodies the principles of safety and applicability, economical rationality, environmental protection and resource saving, and has broad application prospects in fine sand foundations of aeolian sand sites in desert areas.

Example 2:

Based on Embodiment 1, in this embodiment, preferably, the vertical limit stop ring 5 is pasted and welded on the outer wall of the spiral steel pile steel pipe 3 through short steel bars.

Preferably, the short steel bars are circular or three-segment anti-helical around the steel pipe 3 of the spiral steel pile.

Preferably, when the short steel bars are three-stage anti-helical, the spiral direction is opposite to the rotation direction of the spiral steel pile blade 4; Three points of contact.

The limit gear ring 5 among the present invention is pasted and welded on the outer side of the spiral steel pile steel pipe 3 by the short steel bar. The short steel bar can be a circular ring around the spiral steel pile steel pipe 3, or it can be a three-section anti-helical shape around the spiral steel pile steel pipe 3 as shown in Figure 2, and the direction of the spiral is opposite to the direction of rotation of the spiral steel pile blade 4 . When the spiral pile provided by the present invention is rotated and pressed into the foundation and the pile is pulled out by reverse rotation, the contact area of the nozzle edge corresponding to the steel casing 2 connected by the three-stage reverse spiral stopper structure and the vertical fin 1 is small, It is a three-point contact, and the sliding resistance between the steel casing 2 is small. The three-segment anti-helical shape is three arc-shaped segments, which are not in contact with each other.

In the present invention, when the spiral steel pile steel pipe 3 is screwed down into the foundation and reversely rotated to pull out the pile, the limit gear ring 5 can prevent the vertical fin 1 from sliding longitudinally along the spiral steel pile steel pipe 3, so that the vertical fin 1 Together with the spiral steel pile steel pipe 3, it is pressed into or pulled out of the foundation. During the rotation and screw-in process of the spiral steel pile blade 4, the foundation soil around the pile above the blade range is loosened by rotary cutting, which is beneficial for the vertical blade 1 to be pressed into the foundation. Similarly, when pulling out piles, during the rotation of the upper spiral steel pile blade 4, the foundation soil around the pile above the blade range is loosened by rotary cutting, which is beneficial for the vertical blade 1 to be pulled out of the foundation.

Preferably, the spiral directions of the plurality of spiral steel pile blades 4 are consistent.

In the present invention, the inclination angles of a plurality of spiral steel pile blades 4 are consistent, and the number and size positions of the spiral steel pile blades 4 are matched with the spiral steel pile steel pipe 3 according to the requirements. This belongs to the existing mature technology and will not be carried out in the present invention. Further clarification.

Preferably, the plurality of vertical fins 1 are evenly distributed on the circumferential side wall of the steel casing 2 .

Preferably, the vertical fins 1 are in the shape of a rectangle or a right-angled trapezoid, and the upper end of the vertical fin 1 in the shape of a right-angled trapezoid is longer than the lower end.

Preferably, the length of the vertical fins 1 is the same as that of the steel casing 2; the length of the vertical fins 1 extending radially from the steel casing 2 is 50-150mm.

Preferably, the length of the steel casing 2 is 100-300 mm.

In the present invention, the length of the steel casing 2 is preferably 100 mm, 120 mm, 150 mm, 180 mm, 200 mm, 220 mm, 240 mm, 260 mm, 280 mm, and 300 mm according to requirements; The outer diameter of steel pile steel pipe 3 matches, and its inner diameter is slightly larger than the outer diameter of spiral steel pile steel pipe 3, so that steel casing 2 can rotate freely along spiral steel pile steel pipe 3.

In the present invention, the vertical fins 1 are welded on the steel sleeve 2 and integrated with the steel sleeve 2 . In the present invention, the lower end of the spiral steel pile steel pipe 3 is a tip.

In the present invention, on the steel sleeve 2, there are preferably 2 to 4 vertical fins 1 according to requirements, and the edge of each vertical fin 1 is welded to the length direction of the outer surface of the steel sleeve 2 . The vertical fins 1 are preferably rectangular or inverted trapezoidal steel plates with a large top and a small bottom, and the thickness is preferably 6 mm or 8 mm. The shape of the upper and lower fins is convenient to reduce the resistance when cutting into the foundation. One side of the vertical fin 1 is welded on the busbar on the outer surface of the steel casing 2 . When the inverted trapezoidal steel plate is selected, it is welded with the steel casing 2 along the right-angled waist of the trapezoid. The positions of each welded vertical fin 1 are equally divided into the circumference of the steel casing 2 .

In the present invention, the number of vertical fins 1 can be preferably 2 pieces as shown in Figure 3 or 3 pieces as shown in Figure 4 or 4 pieces as shown in Figure 5 according to the main force direction of the horizontal force borne by the screw pile . The vertical length of the vertical fins 1 is equivalent to the length of the steel sleeve 2 and may be slightly shorter than the length of the steel sleeve 2 . The length of the vertical fin 1 radially outward from the steel casing 2 is 50-150mm. The length of the steel casing and the size of the vertical fins 1 can be properly adjusted according to the force requirements to ensure its horizontal bearing capacity.

Example 3:

Based on Embodiment 1 or 2, the present invention provides a method for using a photovoltaic support screw pile with vertical fins. The specific steps are: step 1: making a screw pile, welding the vertical fins The steel casing 2 is socketed in the design position of the lower part of the spiral steel pile steel pipe 3 with a plurality of spiral steel pile blades 4, and then the vertical limit stop ring 5 is welded at the upper and lower ends of the steel casing 2 to complete the spiral pile;

Step 2: Determine the center position of the spiral steel pile steel pipe 3 on the ground;

Step 3: Piling into piles, insert the lower end pile tip of the spiral steel pile steel pipe 3 of the spiral pile made in step 1 into the foundation surface 6 around the pile at the center position positioned in step 2, and then rotate the spiral pile made in step 1 After the pile top of the screw pile reaches the designed elevation, the pile is completed;

Step 4: Perform sprinkling, compaction and leveling treatment on the foundation surface 6 around the pile, so that the foundation surface 6 around the pile is higher than the surrounding ground.

In the present invention, in the step 4, the specific method of processing the foundation surface 5 around the pile is to spray water on the upper part of the spiral steel pile steel pipe 3, tamp and level the pile, and then sprinkle cement slurry for consolidation, or cover it with small stones, In order to avoid the loss of sand and soil on the surface around the pile under the action of wind and rain.

In the present invention, the measurement and positioning of the spiral steel pile steel pipe 3 is marked on the ground according to the design drawings. Design in advance to ensure that the subsequent pile-forming error will not be too large, and ensure the strength and accuracy of the spiral shape.

In the present invention, the specific process of piling into piles is: inserting the lower tip of the steel pipe 3 of the spiral steel pile into the foundation surface 5 at the position. Then use the existing finished special piling rig to screw the screw pile into the foundation. When the top of the pile reaches the design elevation, the pile is completed.

In the present invention, the specific process of treating the foundation surface 5 around the pile is as follows: Sprinkle water around the pile of the screw pile provided by the present invention to compact and level it, so that the foundation surface 5 around the pile is slightly higher than the surrounding ground. For protection in an appropriate range around the pile, cement slurry can be sprinkled for consolidation, or covered with small stones to avoid sand loss from the surface around the pile under the action of wind and rain. Small stones and cement slurry are all prior art, can directly buy practicality in the market, will no longer carry out one by one explanation among the present invention.

The spiral steel pile foundation of the photovoltaic support under the geological conditions of aeolian sand in Gansu, after adopting the structure with vertical fins 1 at the bottom, the pile length was shortened from 4.5m to 3.5m, and the horizontal bearing capacity of the pile was increased by 27%.

The shape feature of the screw pile provided by the invention is beneficial to expand the effect between the pile and the soil. The present invention adds vertical fins 1 to the bottom of the screw pile, and changes the shape characteristics of the pile in the horizontal direction by increasing the horizontal projection area of the bottom of the pile, which is beneficial to directly transfer the horizontal load from the bottom of the pile to the vertical when the pile is subjected to horizontal force. The transfer to the fin 1 to the soil around the pile increases the horizontal force resistance of the pile, increases the service life of the screw pile provided by the present invention, and improves the material use efficiency.

The present invention is applicable to the foundation of photovoltaic supports, small and medium-sized equipment foundations, container module buildings and foundations of overhead line iron towers in wind-blown sandy sites in desert areas. It can also be applied to collapsible loess, silt and other sites.

The above examples are only illustrations of the present invention, and do not constitute a limitation to the protection scope of the present invention. All designs that are the same as or similar to the present invention fall within the protection scope of the present invention. The device structures and method steps not described in detail in the present invention are all prior art, and will not be further described in the present invention.

Claims (10)

1. The utility model provides a photovoltaic support screw pile with vertical fin which characterized in that: including steel casing pipe (2), spiral steel pile steel pipe (3), spiral steel pile blade (4), vertical spacing shelves ring (5) and a plurality of vertical fin (1), spiral steel pile steel pipe (3) on be equipped with a plurality of spiral steel pile blade (4) along length direction, be equipped with steel casing pipe (2) between two adjacent spiral steel pile blade (4), a plurality of vertical fin (1) establish on steel casing pipe (2) outer wall, the upper and lower both ends of steel casing pipe (2) all be equipped with vertical spacing shelves ring (5), steel casing pipe (2) and vertical spacing shelves ring (5) all overlap and establish outside spiral steel pile steel pipe (3).

2. The photovoltaic scaffold screw pile with vertical fins of claim 1, wherein: the vertical limiting stop ring (5) is welded on the outer wall of the spiral steel pile steel pipe (3) through a short steel bar.

3. The photovoltaic scaffold screw pile with vertical fins according to claim 2, characterized in that: the short steel bars are circular or three-section inverse spiral shapes around the spiral steel pile steel pipe (3).

4. The photovoltaic scaffold screw pile with vertical fins according to claim 3, characterized in that: when the short steel bars are three sections of reverse spiral shapes, the spiral direction of the short steel bars is opposite to the rotating direction of the spiral steel pile blades (4); the three sections of reverse spiral short steel bars are in three-point contact with the edge of the pipe orifice of the corresponding steel sleeve (2).

5. The photovoltaic scaffold screw pile with vertical fins of claim 1, wherein: the spiral directions of the spiral steel pile blades (4) are consistent.

6. The photovoltaic scaffold screw pile with vertical fins of claim 1, wherein: the vertical fins (1) are uniformly distributed on the circumferential side wall of the steel sleeve (2).

7. The photovoltaic scaffold screw pile with vertical fins according to claim 1, characterized in that: the vertical fin (1) is rectangular or right trapezoid, and the upper end of the right trapezoid vertical fin (1) is longer than the lower end.

8. The photovoltaic scaffold screw pile with vertical fins of claim 1, wherein: the length of the vertical wing piece (1) is the same as that of the steel sleeve (2); the length of the vertical fin (1) extending outwards from the steel sleeve (2) in the radial direction is 50-150mm.

9. The photovoltaic scaffold screw pile with vertical fins of claim 1, wherein: the length of the steel sleeve (2) is 100 to 300mm.

10. The use method of the photovoltaic bracket screw pile with the vertical fin is provided according to any one of claims 1 to 9, and is characterized in that: the method comprises the following specific steps: the method comprises the following steps: manufacturing a spiral pile, sleeving a steel sleeve (2) welded with vertical fins (1) at the lower design position of a spiral steel pile steel pipe (3) provided with a plurality of spiral steel pile blades (4), and then welding vertical limiting stop rings (5) at the upper end and the lower end of the steel sleeve (2) to manufacture the spiral pile;

step two: determining the central position of a spiral steel pile steel pipe (3) on the ground;

step three: piling to form a pile, namely inserting the pile tip at the lower end of the spiral steel pile steel pipe (3) of the spiral pile manufactured in the step one into the surface (6) of the foundation around the pile at the central position positioned in the step two, screwing the spiral pile manufactured in the step one into the foundation, and completing pile forming after the pile top of the spiral pile reaches the designed elevation;

step four: and (3) carrying out watering tamping leveling treatment on the surface (6) of the foundation around the pile to enable the surface (6) of the foundation around the pile to be higher than the surrounding ground.

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