Composite screw pile foundation with anti-frost pull performance, glass fiber composite screw pile foundation and photovoltaic system

Abstract

The utility model belongs to photovoltaic power generation technical field.Proposed a kind of composite spiral pile foundation with anti-frost pullout performance, glass fiber composite spiral pile foundation and photovoltaic system, comprising: conical glass fiber pipe and spiral anchor head, the lower end of conical glass fiber pipe is detachably connected with the upper end of spiral anchor head, the cross section of conical glass fiber pipe is circular, and the cross section of conical glass fiber pipe gradually increases from top to bottom;The utility model adopts the combination of conical glass fiber pipe and spiral anchor head, weakens the freezing strength between pile body and frozen soil when soil body freezes, improves the anti-frost pullout performance of spiral pile foundation.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power generation technology, and in particular to a composite helical pile foundation with anti-freeze pull-out properties, a glass fiber composite helical pile foundation and a photovoltaic system. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] In some areas with extensive permafrost coverage, abundant solar energy resources are present. Constructing photovoltaic power stations in these sun-drenched regions can efficiently convert solar energy into electricity—a process that is environmentally friendly and pollution-free. However, due to the low temperatures, moisture in the soil freezes, causing frost heave. This frost heave force poses a significant threat to the photovoltaic foundation, causing it to shift due to upward frost heave. Furthermore, when temperatures rise the following year, the soil does not fully recover to its original state; this cumulative effect eventually leads to upward displacement or tilting of the photovoltaic foundation.

[0004] Currently, solar photovoltaic projects are increasingly adopting helical piles as their foundation structure. Thanks to the design of the helical blades, the helical piles exhibit excellent interlocking performance with the soil. However, while helical piles have developed rapidly, their engineering adaptability issues have gradually become apparent. In seasonally frozen soil regions, as the freezing depth of the soil increases, the frost heave force generated within the frozen soil also increases significantly, posing a severe challenge to the frost pull-out resistance of helical piles and weakening their pull-out capacity. Simultaneously, photovoltaic panels themselves are weak and lightweight, and the superstructure cannot balance the frost heave force in the frozen soil layer. Photovoltaic foundations in frozen soil regions are easily subjected to frost pull-out damage unique to frozen soil. Increased frost pull-out displacement further triggers deformation and even fracture of the superstructure, seriously affecting the stable operation of the photovoltaic system. This chain of effects ultimately leads to reduced power generation, unutilized solar energy, and energy waste. Currently, the commonly used measure is to increase the frost pull-out resistance of the piles by improving the helical pile structure, such as analyzing factors like anchor spacing, anchor plate size, anchor plate thickness, and pile length to determine the optimal geometric structure combination. However, optimizing the helical pile structure has limited effect on improving frost pull-out resistance and cannot meet actual usage requirements. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a composite helical pile foundation with frost-pull-out resistance, a glass fiber composite helical pile foundation, and a photovoltaic system. It adopts a combination of tapered glass fiber tubes and helical anchor heads, which reduces the freezing intensity between the pile body and the frozen soil when the soil freezes, thereby improving the frost-pull-out resistance of the helical pile foundation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Firstly, this utility model provides a glass fiber composite helical pile foundation with anti-freeze and anti-pull-out properties.

[0008] A fiberglass composite helical pile foundation with frost-resistant pull-out properties includes: a tapered fiberglass tube and a helical anchor head. The lower end of the tapered fiberglass tube is detachably connected to the upper end of the helical anchor head. The cross-section of the tapered fiberglass tube is circular, and the cross-sectional area of ​​the tapered fiberglass tube gradually increases from top to bottom.

[0009] In one implementation of the first aspect of this utility model, two pairs of staggered cross-shaped symmetrical screw holes are opened on the upper side wall of the steel spiral anchor head, and two pairs of staggered cross-shaped symmetrical screw holes are opened on the lower side wall of the tapered glass fiber tube. The cross-shaped symmetrical screw holes of the steel spiral anchor head and the cross-shaped symmetrical screw holes of the tapered glass fiber tube are positioned opposite each other and are fixed by bolts.

[0010] In one implementation of the first aspect of this utility model, the diameter of the cross-shaped symmetrical screw hole of the steel spiral anchor head is the same as the diameter of the cross-shaped symmetrical screw hole of the tapered glass fiber tube.

[0011] As a further limitation of the first aspect of this utility model, the diameter of the cross-shaped symmetrical screw hole of the steel spiral anchor head and the diameter of the cross-shaped symmetrical screw hole of the tapered glass fiber tube are both 5 mm.

[0012] In one implementation of the first aspect of this utility model, the outer diameter of the lower end of the tapered glass fiber tube connected to the spiral anchor head is 1mm to 2mm smaller than the inner diameter of the steel spiral anchor head.

[0013] In one implementation of the first aspect of this utility model, the spiral anchor head is made of Q235 steel.

[0014] In one implementation of the first aspect of this utility model, the tapered glass fiber tube is made of glass fiber reinforced plastic.

[0015] In one implementation of the first aspect of this utility model, an epoxy resin layer is applied to the interface between the tapered glass fiber tube and the spiral anchor head.

[0016] In one implementation of the first aspect of this utility model, the spiral anchor head has at least two spiral blades arranged from top to bottom.

[0017] Secondly, this utility model provides a composite helical pile foundation with anti-freezing and pull-out properties.

[0018] A composite helical pile foundation with anti-freezing and pull-out properties includes: a tapered tube and a helical anchor head, wherein the lower end of the tapered tube is detachably connected to the upper end of the helical anchor head, the cross-section of the tapered tube is circular, and the area of ​​the cross-section of the tapered tube gradually increases from top to bottom;

[0019] The tapered tube is made of carbon fiber composite material, basalt fiber composite material, alumina ceramic matrix composite material, polytetrafluoroethylene composite material, or zirconium alloy.

[0020] Thirdly, this utility model provides a photovoltaic system, including a photovoltaic module and a glass fiber composite helical pile foundation with anti-freeze-pull-out properties as described in the first aspect of this utility model or a composite helical pile foundation with anti-freeze-pull-out properties as described in the second aspect, wherein the photovoltaic module is connected to the upper end of the glass fiber composite helical pile foundation.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This utility model innovatively develops a glass fiber composite helical pile foundation with anti-freeze-pull-out properties. The upper part of the composite helical pile is a conical glass fiber tube with low thermal conductivity and smooth surface. Due to the low thermal conductivity of glass fiber material, the temperature between the pile and the soil at the same depth is basically the same, avoiding the generation of lateral temperature gradient. This inhibits the lateral migration of water to the vicinity of the pile foundation, resulting in a reduction in the ice content near the composite helical pile foundation compared to the ice content near ordinary helical piles. This weakens the frost heave of the soil near the pile foundation, thus reducing the large frost heave force on the pile foundation.

[0023] 2. The surface of the fiberglass tube in this invention is very smooth, resulting in a low coefficient of friction between it and the soil. This suppresses the transmission of tangential frost heave force. The tapered shape of the fiberglass tube reduces the tangential frost heave force compared to cylindrical or square foundations. The tapered cross-section foundation can achieve frost pull-out resistance through its structural advantages, effectively controlling the frost pull-out displacement of the helical pile foundation. This keeps the photovoltaic modules in a stable state, achieving optimal power generation efficiency.

[0024] 3. The glass fiber composite spiral pile in this utility model has good corrosion resistance. Even if the soil has a certain degree of salinity, it is basically unaffected, thus avoiding the phenomenon of corrosion and damage to the steel spiral pile foundation caused by saline-alkali land.

[0025] 4. The glass fiber tube of this utility model has good water-repellent properties. Compared with steel spiral piles, which are affected by water in the soil and thus corroded, the glass fiber tube, due to its water-repellent properties, will not corrode the pile body due to the action of water, unlike metal pipes, thus avoiding the need for anti-rust coating treatment on the outer layer of the pile body.

[0026] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0028] Figure 1 A schematic diagram of a glass fiber composite helical pile foundation with anti-freeze-pull-out properties provided as an exemplary embodiment of the present invention;

[0029] Figure 2 A schematic diagram illustrating the frost heave force analysis of a glass fiber tube tapered pile and a straight pile, provided as an exemplary embodiment of this utility model;

[0030] Among them, 1. tapered fiberglass tube; 2. spiral anchor head; 3. bolt; 4. spiral blade. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] In this implementation, a glass fiber composite helical pile foundation with frost-pull resistance is proposed, comprising: a tapered glass fiber tube and a helical anchor head, wherein the lower end of the tapered glass fiber tube is detachably connected to the upper end of the helical anchor head, the cross-section of the tapered glass fiber tube is circular, and the cross-sectional area of ​​the tapered glass fiber tube gradually increases from top to bottom.

[0034] like Figure 2 As shown, the tangential and normal frost heave forces acting on the tapered glass fiber tube are decomposed vertically and horizontally, including:

[0035] (1);

[0036] (2);

[0037] As you can see, The tangential frost heave force experienced will be reduced compared to a cylindrical or square foundation.

[0038] In this implementation, preferably, two pairs of staggered cross-shaped symmetrical screw holes are opened on the upper side wall of the steel spiral anchor head, and two pairs of staggered cross-shaped symmetrical screw holes are opened on the lower side wall of the tapered glass fiber tube. The cross-shaped symmetrical screw holes of the steel spiral anchor head and the cross-shaped symmetrical screw holes of the tapered glass fiber tube are positioned opposite each other and are fixedly connected by bolts and nuts.

[0039] In this implementation, preferably, the diameter of the cross-shaped symmetrical screw hole of the steel spiral anchor head is the same as the diameter of the cross-shaped symmetrical screw hole of the tapered glass fiber tube; optionally, the diameter of the cross-shaped symmetrical screw hole of the steel spiral anchor head and the diameter of the cross-shaped symmetrical screw hole of the tapered glass fiber tube are both 5mm. Of course, other diameters can also be used, such as 6cm, 7cm, etc. Those skilled in the art can choose according to the specific application environment, which will not be elaborated here.

[0040] In this implementation, preferably, the outer diameter of the lower end of the tapered glass fiber tube connected to the spiral anchor head is 1mm to 2mm smaller than the inner diameter of the steel spiral anchor head, so as to ensure that the tapered glass fiber tube can be inserted into the spiral anchor head.

[0041] In this implementation, preferably, the spiral anchor head is made of Q235 steel; of course, higher-cost materials such as Q345 steel, 35CrMo alloy steel, and 42CrMo alloy steel can also be used. Those skilled in the art can choose according to strength and cost requirements, which will not be elaborated here.

[0042] In this implementation, preferably, the tapered glass fiber tube is made of glass fiber reinforced plastic, commonly known as fiberglass, which has the characteristics of low thermal conductivity, strong corrosion resistance, and high mechanical strength.

[0043] In this implementation, preferably, an epoxy resin layer is applied to the interface between the tapered glass fiber tube and the spiral anchor head.

[0044] Understandably, in other implementations, the tapered glass fiber tube portion of the composite helical pile can be replaced with other materials that have low thermal conductivity, high mechanical strength, and corrosion resistance, such as carbon fiber composites, basalt fiber composites, alumina ceramic matrix composites, polytetrafluoroethylene (PTFE) composites, or zirconium alloys (such as zirconium-niobium alloys), etc. Those skilled in the art can make the selection based on the specific application and cost, which will not be elaborated here.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A glass fiber composite helical pile foundation with frost-pull resistance, characterized in that, include: A tapered fiberglass tube and a spiral anchor head, wherein the lower end of the tapered fiberglass tube is detachably connected to the upper end of the spiral anchor head, the cross-section of the tapered fiberglass tube is circular, and the cross-sectional area of ​​the tapered fiberglass tube gradually increases from top to bottom.

2. The glass fiber composite helical pile foundation with frost-pull-out resistance as described in claim 1, characterized in that, Two pairs of staggered cross-shaped symmetrical screw holes are opened on the upper side wall of the steel spiral anchor head, and two pairs of staggered cross-shaped symmetrical screw holes are opened on the lower side wall of the tapered glass fiber tube. The cross-shaped symmetrical screw holes of the steel spiral anchor head and the cross-shaped symmetrical screw holes of the tapered glass fiber tube are positioned opposite each other and are fixed by bolts.

3. The glass fiber composite helical pile foundation with frost-pull resistance as described in claim 2, characterized in that, The diameter of the cross-shaped symmetrical screw hole of the steel spiral anchor head is the same as the diameter of the cross-shaped symmetrical screw hole of the tapered glass fiber tube.

4. The glass fiber composite helical pile foundation with frost-pull resistance as described in claim 3, characterized in that, The diameter of the cross-shaped symmetrical screw hole of the steel spiral anchor head and the diameter of the cross-shaped symmetrical screw hole of the tapered glass fiber tube are both 5 mm.

5. The glass fiber composite helical pile foundation with frost-pull resistance as described in claim 1, characterized in that, The outer diameter of the lower end of the tapered glass fiber tube connected to the spiral anchor head is 1mm to 2mm smaller than the inner diameter of the steel spiral anchor head.

6. The glass fiber composite helical pile foundation with frost-pull resistance as described in claim 1, characterized in that, The spiral anchor head is made of Q235 steel, and the tapered glass fiber tube is made of glass fiber reinforced plastic.

7. The glass fiber composite helical pile foundation with frost-pull-out resistance as described in any one of claims 1-6, characterized in that, An epoxy resin layer is applied to the interface between the tapered glass fiber tube and the spiral anchor head.

8. The glass fiber composite helical pile foundation with frost-pull-out resistance as described in any one of claims 1-6, characterized in that, The spiral anchor head has at least two spiral blades arranged from top to bottom.

9. A composite helical pile foundation with frost-resistant pull-out properties, characterized in that, include: A tapered tube and a spiral anchor head, wherein the lower end of the tapered tube is detachably connected to the upper end of the spiral anchor head, the cross-section of the tapered tube is circular, and the area of ​​the cross-section of the tapered tube gradually increases from top to bottom; The tapered tube is made of carbon fiber composite material, basalt fiber composite material, alumina ceramic matrix composite material, polytetrafluoroethylene composite material, or zirconium alloy.

10. A photovoltaic system, characterized in that, The invention includes a photovoltaic module and a glass fiber composite helical pile foundation with frost-pull resistance as described in any one of claims 1-8; or a composite helical pile foundation with frost-pull resistance as described in claim 9, wherein the photovoltaic module is connected to the upper end of the glass fiber composite helical pile foundation.

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