Photovoltaic flexible support cable-stayed foundation in desert and construction method of photovoltaic flexible support cable-stayed foundation

Abstract

The invention relates to the technical field of rock soil, and particularly discloses a photovoltaic flexible support cable-stayed foundation in desert and a construction method thereof, and the foundation comprises a hollow anchor rod, an anchor disc, an upper end spiral blade, a lower end spiral blade, a grouting nozzle and the like. A fixed support is welded on the cable-stayed foundation and is connected with a sliding support above the cable-stayed foundation through a spring; the four cylinders are respectively welded with the push rod and can move along the cable-stayed foundation under the action of external force and the spring; at least two bolt holes are formed in the cable-stayed foundation ground section, and the cable-stayed foundation ground section is connected with a rotary supporting circular plate with a cylindrical equal-diameter rotary through hole. High-pressure rotary jet grouting is carried out on the stratum with the final unfolding depth of the anchor disc, resistance borne by the unfolded anchor disc after the cable-stayed foundation is driven into the stratum is reduced, a soil body is strengthened, and the anti-pulling capacity of the foundation in the desert is improved; the gradual shrinkage type grouting nozzle is combined with the humidity sensor, the grouting amount is accurately controlled, the reinforcing effect is ensured, meanwhile, resource waste is reduced, the stability problem of the desert photovoltaic flexible support foundation is effectively solved, and the overall stability and economical efficiency of the system are improved.

Description

Technical Field

[0001] The invention relates to the field of rock and soil technology, and specifically discloses a photovoltaic flexible support oblique-stayed foundation in a desert and a construction method thereof. Background Art

[0002] Desert areas are rich in solar energy resources. The effective use of these energies can greatly boost the regional economy and help ecological protection. However, in desert environmental conditions, the installation and operation of photovoltaic flexible brackets face many challenges. Under typical loads, flexible brackets need to have sufficient pull-out resistance, which means that inclined pull-out foundations need to be arranged. Desert soils are mostly loose sand or gravel layers, which have low bearing capacity, weak anchoring force, high stratum corrosion, and are susceptible to wind and sand erosion and seasonal moisture changes, making it difficult for traditional anchor foundations to meet the stability requirements of photovoltaic flexible brackets. In particular, for anchor rods that are easy to construct and have a small diameter, it is difficult to form an effective pull-out anchoring force in the desert, and their pull-out bearing capacity and deformation resistance are relatively weak. As mentioned above, the bearing capacity of the stratum in the desert environment is limited, and the pull-out bearing performance and long-term bearing stability of the flexible bracket inclined-stayed foundation are difficult to effectively guarantee, which has become a key factor restricting the construction and operation of desert photovoltaic power stations.

[0003] Existing desert photovoltaic bracket anchoring technologies mostly use traditional anchor rods or pile foundations, which have obvious limitations in desert environments. On the one hand, traditional anchor rods are easily affected by the resistance of rock and soil during the driving process, and the depth of anchoring is limited. After the construction is completed, the foundation pull-out bearing capacity is low. When it comes to oblique drilling construction in desert strata, there will be great difficulties or even no construction, which seriously affects the quality of the project and the progress of the construction. On the other hand, when desert photovoltaic brackets use pile foundations, the amount of basic materials and the cost of on-site pile foundation construction are high, the construction period is long, and the complex construction machinery and processes will also cause great damage to the desert ecological environment. The spiral anchor foundation is an important idea to solve the pull-out problem in the above-mentioned engineering environment, but the existing technology has the disadvantages of simple anchor rod form, low overall pull-out resistance, insufficient durability, and complex construction connection, which requires further technological innovation.

[0004] In view of the challenges of pull-out resistance and load-bearing stability faced by the inclined foundation of photovoltaic flexible support in desert environments, as well as the limitations of existing technologies in this field, it is urgent to develop a new foundation form that can achieve efficient and stable pull-out anchoring effects under complex desert geological conditions, to ensure that the photovoltaic flexible support can still maintain a stable operating state in harsh desert environments. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to provide a photovoltaic flexible support inclined-stayed foundation in the desert and a construction method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A photovoltaic flexible support inclined-stayed foundation in the desert, comprising a hollow anchor rod, the bottom end of the anchor rod being an anchor head, and a lower spiral blade and an upper spiral blade being arranged near the bottom end of the anchor rod;

[0008] A plurality of grouting nozzles are respectively arranged on the surface of the anchor rod between the lower spiral blade and the upper spiral blade, and on the surface of the anchor rod above the upper spiral blade. The anchor rod is internally provided with grouting pipes connected to the various grouting nozzles, and the grouting pipes are connected to a grouting device arranged on the ground surface.

[0009] Humidity sensors are also distributed in the area near the several grouting nozzles on the anchor rod, and the anchor rod has built-in wires connected to the humidity sensors, and the wires are connected to the sensor analyzer set on the surface;

[0010] A basic anchor is installed on the top of the anchor rod, and the basic anchor is connected to the photovoltaic flexible bracket through the connection with the flexible bracket pull rod.

[0011] As a further preferred solution, the anchor rod is provided with a fixed support, a sliding support, an anchor plate, and a linkage rod located underground, wherein the fixed support is fixed to the anchor rod, the sliding support is an annular structure, sleeved on the anchor rod, and located above the fixed support, and a spring is provided between the fixed support and the sliding support; the anchor plate is hinged to the fixed support through an anchor plate fixing piece, the linkage rod is hinged to the sliding support through a linkage rod fixing piece, and the end of the linkage rod is hinged to the anchor plate through a rivet;

[0012] As a further preferred solution, the anchor rod is provided with a rotary support circular plate located on the ground, the rotary support circular plate is sleeved on the anchor rod, a push rod is provided between the rotary support circular plate and the sliding support, and part of the push rod is located below the ground surface.

[0013] As a further preferred embodiment, the diameter of the upper spiral blade is larger than that of the lower spiral blade.

[0014] As a further preferred solution, a fixing bolt is detachably mounted on the side of the anchor rod above the spiral support circular plate, and the fixing bolt is used to prevent the spiral support circular plate from moving upward.

[0015] As a further preferred solution, the top of the anchor rod is provided with a supplementary section, the inner wall of the top of the anchor rod has an internal thread, and the connection between the supplementary section and the top of the anchor rod has an external thread.

[0016] As a further preferred solution, a flange is installed at the top end of the anchor rod, and a flange is also installed at the bottom end of the supplementary section. The two flanges are fixedly connected by bolts and fastening nuts.

[0017] A construction method for a photovoltaic flexible support inclined-stayed foundation in a desert comprises the following steps:

[0018] S1: The anchor rod is placed obliquely at the site where the inclined-stayed foundation is anchored. The push rod is pushed by external pressure to move the sliding support downward. The rotation hole of the rotary support circular plate is not aligned with the cylinder above the push rod, so that the anchor plate is contracted and fixed to the anchor rod side. The anchor rod is pressed into the stratum by a rotating pressure machine, and the anchor plate enters the underground.

[0019] S2: Use high-pressure rotary jet grouting technology to grout the soil in the stratum at the depth where the anchor plate is located to strengthen the soil strength; then rotate the rotary support circular plate to make the cylinder pass through the rotary through hole, and under the thrust of the compression spring and the external tension on the push rod, the anchor plate is deployed to the side away from the anchor rod until the linkage rod is horizontal and the anchor plate deployment angle is maximum;

[0020] S3: Grouting is performed into the grouting pipe through the grouting device on the ground, and the grouting is sprayed to the strata above and below the upper spiral blade through the grouting nozzle;

[0021] S4: The grouting is monitored in real time by means of a humidity sensor installed on the side wall of the anchor bolt. When the humidity sensor detects that the grouting meets the qualified requirements, the grouting device is turned off and the grouting is stopped;

[0022] S5: Install the foundation anchor on the top of the anchor rod, and put the U-shaped bracket tie rod anchor on the foundation anchor; when the flexible bracket tie rod is pulled to a suitable length in the U-shaped bracket tie rod anchor, lock the threaded lock.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0024] (1) The present invention designs a photovoltaic flexible support inclined-stayed foundation in the desert. By implementing high-pressure rotary jet grouting construction on the soil within the depth range of the anchor plate at the top of the inclined-stayed foundation, the slurry is fully mixed with the desert surface soil layer to solidify the rock and soil particles around the inclined-stayed foundation, which significantly improves the overall strength of the soil. After the anchor plate is deployed, it can be tightly combined with the solidified soil, forming a more stable mechanical bite and friction resistance. Compared with the traditional method, the embedding effect of the inclined-stayed foundation anchor plate of the present invention in the solidified soil of the desert surface is significantly improved, which effectively improves the pull-out resistance of the upper part of the inclined-stayed foundation and enhances the overall stability and durability.

[0025] (2) The present invention designs a photovoltaic flexible support inclined-stayed foundation in the desert. The upper spiral blades and upper and lower grouting nozzles are added to the inclined-stayed foundation. Through all-round grouting reinforcement, the strength of the soil around the inclined-stayed foundation, especially the upper soil, is enhanced, and the coordinated pull-out resistance of the inclined-stayed foundation and the soil is significantly improved. This design optimizes the stress distribution of the inclined-stayed foundation in the soil, effectively resists external pull-out forces, and the inclined-stayed foundation rod body and the grouting body are combined to form a columnar structure, which provides beneficial pull-out resistance while reducing soil corrosion on the stress concentration section rod body, further ensuring the stability and safety of the photovoltaic flexible support in complex environments such as deserts, and improving the operating efficiency and durability of the overall system.

[0026] (3) The photovoltaic flexible support inclined-stayed foundation designed in the present invention is designed with a tapered grouting nozzle to ensure a wide range of slurry spraying, improve grouting efficiency and coverage, and combine with humidity sensors to accurately control the grouting volume, thereby ensuring the soil reinforcement effect and avoiding resource waste, achieving efficient and economical photovoltaic flexible support foundation reinforcement, and enhancing the overall stability and environmental benefits of the system.

[0027] (4) The present invention designs a photovoltaic flexible support inclined-stayed foundation in the desert, wherein a lower spiral blade is installed at the bottom of the inclined-stayed foundation, and the outer diameter of the lower spiral blade gradually decreases from top to bottom. The inclined-stayed foundation can be more easily spun into deep strata under the mechanical action of the rotating pressure with the anchor head, thereby solving the problems of difficulty in driving into and insufficient driving depth of the traditional inclined-stayed foundation.

[0028] (5) The present invention designs a photovoltaic flexible support inclined-stayed foundation in the desert, which can solve the problem of stress concentration on the top of the traditional foundation by installing a foundation anchor with a larger area on the top of the inclined-stayed foundation. At the same time, the flexible support rod is sleeved in the U-shaped support rod anchor and controlled by the thread lock. The working section length of the rod can be flexibly and adaptively changed according to different working environments without changing the anchoring depth of the inclined-stayed foundation, which is efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The inclined-stayed foundation of the photovoltaic flexible support in the desert of the embodiment of the present invention is being attempted;

[0030] Figure 2 This is a cross-sectional view of the oblique-stayed foundation of a photovoltaic flexible support in a desert according to an embodiment of the present invention;

[0031] Figure 3 for Figure 1 Cross-sectional view of the middle BB section;

[0032] Figure 4 for Figure 1 Middle AA section view;

[0033] Figure 5This is a cross-sectional view of a supplementary section of the oblique-stayed foundation of a photovoltaic flexible support in a desert according to an embodiment of the present invention;

[0034] Figure 6 This is a supplementary rear elevation view of the oblique-stayed foundation of a photovoltaic flexible support in a desert according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the deployment and grouting of the inclined anchor plate of the photovoltaic flexible support in the desert according to an embodiment of the present invention;

[0036] In the figure: 1-anchor rod, 2-upper spiral blade, 3-lower spiral blade, 4-anchor head, 5-fixed support, 6-anchor plate, 7-anchor plate fixing, 8-sliding support, 9-spring, 10-linkage rod fixing, 11-rivet, 12-linkage rod, 13-humidity sensor, 14-grouting nozzle, 15-push rod, 16-grouting device, 17-sensor analyzer, 18-wire, 19-grouting pipe, 20-cylinder, 21-internal thread, 22-external thread, 23-flange, 24-bolt, 25-fastening nut, 26-supplementary section, 27-foundation anchor, 28-U-type bracket tie rod anchor, 29-flexible bracket tie rod, 30-thread lock buckle, 31-slurry, 32-swivel support circular plate, 33-fixing bolt, 34-swivel through hole. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application, wherein the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0038] like Figures 1 to 7 As shown, a photovoltaic flexible support inclined-stayed foundation in the desert includes an integrated anchor rod 1 and an anchor head 4. The anchor head 4 is at the bottom of the anchor rod 1. The anchor rod 1 is driven into the desert soil perpendicular to the ground.

[0039] like Figures 1-2 As shown, the anchor rod 1 is a cylindrical structure, and a lower end spiral blade 3 is installed laterally at the end of the anchor rod. In this embodiment, an anchor head 4 is welded to the bottom of the anchor rod, and the lower end spiral blade 3 has a small diameter. When the lower end spiral blade 3 cooperates with the anchor head 4, it can greatly facilitate the constructor to rotate and press the anchor rod 1 into the ground under construction through a rotary pressure machine.

[0040] Assume that D is the outer diameter of the anchor rod 1, and the upper spiral blade 2 is installed at a distance of (3 to 4.5) D from the lower spiral blade 3 on the outer side of the anchor rod 1. The upper spiral blade 2 and the lower spiral blade 3 are installed on the outer side of the anchor rod 1 in a manner including but not limited to welding, riveting, etc. The diameters of the upper spiral blade 2 and the lower spiral blade 3 are 2 to 5 times the outer diameter of the anchor rod 1, and the diameter of the upper spiral blade 2 is preferably the larger value of the outer diameter.

[0041] The present invention installs four grouting nozzles 14 at the upper and lower ends of the upper spiral blade 2, and two grouting nozzles 14 at the upper end of the lower spiral blade 3. The grouting nozzles 14 are connected to the grouting pipe 19 inside the anchor rod, and the slurry is sprayed into the formation through the grouting pipe 19 and the grouting nozzles 14 through the pressure drop device 16. In this embodiment, the outer diameter of the grouting nozzle 14 is gradually reduced, so that the slurry 31 therein can be sprayed to a larger range. A humidity sensor 13 is installed on the outer side of the anchor rod between the upper spiral blade 2 and the lower spiral blade 3 and at a position 2D from the upper part of the upper spiral blade 3. During the grouting process, the humidity sensor 13 can sense whether the slurry reaches the periphery of the humidity sensor 13, and transmit the signal to the ground sensor analyzer 17 through the wire 18 inside the anchor rod 1 to determine whether the grouting is completed.

[0042] like Figures 1 to 4 As shown, in order to further improve the pull-out resistance of the photovoltaic inclined-stayed foundation in the desert, in this embodiment, a fixed support 5 is welded to the upper part of the buried section of the anchor rod 1, and four anchor plates 6 are hinged to the fixed support 5 through anchor plate fixings 7 respectively, and the anchor plates 6 can rotate up and down around the fixed support 5 for flipping. A sliding support 8 is provided on the upper part of the fixed support 5 and is sleeved on the anchor rod 1. The sliding support 8 can move radially along the anchor rod 1. A linkage rod 12 is hingedly installed on the sliding support 8 in the left and right directions corresponding to the anchor plate 6 through a linkage rod fixing 10, and the linkage rod 12 can rotate around the sliding support 8. The end of the linkage rod 12 is movably connected to the anchor plate 6 through a rivet 11. The fixed support 5 and the sliding support 8 are connected by a spring 9.

[0043] In this embodiment, the push rod 15 is welded to the sliding support 8. When the anchor rod 1 is driven into the stratum, the external pressure is applied to the rotary support circular plate 32. The rotary support circular plate 32 transmits the downward pressure to each push rod 15 through the bottom cylinder 20, so that the push rod 15 and the sliding support 8 move downward along the anchor rod 1, compressing the spring 9, so that the linkage rod 12 shrinks the anchor plate 6 upward. At the same time, the lower end of the rotary support circular plate 32 is displaced against the cylinder 20, and the fixing bolt 33 is inserted into the corresponding bolt hole of the anchor rod 1. After the stratum above the fixed support 7 is treated with high-pressure rotary spraying, the rotary support circular plate 32 is rotated so that the cylinder 20 is facing the rotary through hole 34, and the thrust of the spring 9 is used to retract the push rod 15 upward, thereby unfolding the anchor plate 6. After the slurry 31 solidifies, the pull-out resistance of the inclined-stayed foundation is improved.

[0044] like Figure 2, as shown in Figures 5 and 6, when the anchor rod 1 is not deep enough during construction, the anchor rod 1 needs to be lengthened. Each section of the anchor rod 1 has an internal thread 21 on the inner side of the top, and the supplementary section 26 has an external thread 22 at the lower part where it is connected to the anchor rod 1, so that the supplementary section can be connected to the anchor rod 1 through the thread to lengthen it. After the supplementary section 26 is connected to the anchor rod 1 through the thread, a flange 23 is welded at the bottom of the supplementary section 26 and the top of the anchor rod 1. After the bolt 24 is inserted into the flange 23, the supplementary section 26 is further installed on the anchor rod 1 by tightening the nut 25.

[0045] In this embodiment, after the inclined-stayed foundation is driven into the ground, the foundation anchor 27 is installed on the top of the anchor rod 1, and there is a hole on the foundation anchor 27 for the U-shaped support rod anchor 28 to be inserted. After the U-shaped support rod anchor 28 is sleeved on the foundation anchor 27, the flexible support rod 29 is pulled to a suitable state and then installed on the U-shaped support rod anchor 28 and the thread lock 30 is locked.

[0046] The above-mentioned photovoltaic flexible support inclined-stayed foundation in the desert specifically comprises the following steps:

[0047] S1: The anchor rod is placed obliquely at the site where the inclined-stayed foundation is anchored. The push rod is pushed by external pressure to move the sliding support downward, so that the anchor plate shrinks toward the anchor rod side, and then the anchor rod is pressed into the formation by a rotating pressure machine.

[0048] S2: Use high-pressure rotary grouting technology in the stratum where the anchor plate is finally located, that is, grouting is performed in the soil in the stratum through a grouting nozzle to strengthen the soil strength. After the anchor rod reaches the predetermined depth, the push rod is then pulled upward to expand the anchor plate away from the anchor rod until the linkage rod is horizontal and the anchor plate expansion angle is maximum.

[0049] S3: Grouting is performed into the grouting pipe through the grouting device on the ground, and the grouting is sprayed through the grouting nozzle to the strata above and below the upper spiral blade.

[0050] S4: The grouting is monitored in real time through the humidity sensor installed on the side wall of the anchor. When the humidity sensor detects that the grouting meets the qualified requirements, the grouting device is turned off and the grouting is stopped.

[0051] S5: Install the foundation anchor on the top of the anchor rod, and put the U-shaped support rod anchor on the foundation anchor. When the flexible support rod is pulled to the appropriate length in the U-shaped support rod anchor, the thread lock is locked. When anchoring in deeper strata, take out the supplementary section, and thread the supplementary section with the lower external thread and the upper internal thread of the original anchor rod. At the same time, weld the flange at the lower end of the supplementary section and the upper end of the original anchor rod, and further secure the supplementary section with bolts and tightening nuts.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A photovoltaic flexible support inclined-stayed foundation in the desert, characterized by: It comprises a hollow anchor rod (1), the bottom end of the anchor rod (1) is an anchor head (4), and a lower spiral blade (3) and an upper spiral blade (2) are provided on the anchor rod (1) near the bottom end; A plurality of grouting nozzles (14) are respectively provided on the surface of the anchor rod (1) between the lower spiral blade (3) and the upper spiral blade (2), and on the surface of the anchor rod (1) above the upper spiral blade (2). The anchor rod (1) is internally provided with a grouting pipe (19) connected to each grouting nozzle (14), and the grouting pipe (19) is connected to a grouting device (16) provided on the ground surface. Humidity sensors (13) are also distributed in the area near the plurality of grouting nozzles (14) on the anchor rod (1), and the anchor rod (1) is internally provided with wires (18) connected to the various humidity sensors (13), and the wires (18) are connected to a sensor analyzer (17) arranged on the ground surface; A basic anchor (27) is installed at the top end of the anchor rod (1), and the basic anchor (27) is connected to the photovoltaic flexible support through connection with a flexible support tie rod (29).

2. The photovoltaic flexible support inclined-stayed foundation in the desert according to claim 1 is characterized by: The anchor rod (1) is provided with a fixed support (5), a sliding support (8), an anchor plate (6), and a linkage rod (12) located underground. The fixed support (5) is fixed on the anchor rod (1). The sliding support (8) is an annular structure, which is sleeved on the anchor rod (1) and is located above the fixed support (5). A spring (9) is provided between the fixed support (5) and the sliding support (8). The anchor plate (6) is hinged to the fixed support (5) through an anchor plate fixing member (7). The linkage rod (12) is hinged to the sliding support (8) through a linkage rod fixing member (10). The end of the linkage rod (12) is hinged to the anchor plate (6) through a rivet (11).

3. The photovoltaic flexible support inclined-stayed foundation in the desert according to claim 2 is characterized by: The anchor rod (1) is provided with a rotary support circular plate (32) located on the ground, the rotary support circular plate (32) is sleeved on the anchor rod (1), a push rod (15) is provided between the rotary support circular plate (32) and the sliding support (8), and part of the push rod (15) is located below the ground surface.

4. The photovoltaic flexible support inclined-stayed foundation in the desert according to claim 3 is characterized by: The diameter of the upper spiral blade (2) is larger than that of the lower spiral blade (3).

5. The photovoltaic flexible support inclined-stayed foundation in the desert according to claim 3 is characterized by: A fixing bolt (33) is detachably mounted on the side of the anchor rod (1) above the spiral support circular plate (32), and the fixing bolt (33) is used to prevent the spiral support circular plate (32) from moving upward.

6. The photovoltaic flexible support inclined-stayed foundation in the desert according to claim 1, characterized in that: The top end of the anchor rod (1) is provided with a supplementary section (26), the inner wall of the top end of the anchor rod (1) has an internal thread (21), and the connection between the supplementary section (26) and the top end of the anchor rod (1) has an external thread (22).

7. The photovoltaic flexible support inclined-stayed foundation in the desert according to claim 6, characterized in that: A flange (23) is installed at the top end of the anchor rod (1), and a flange (23) is also installed at the bottom end of the supplementary section (26). The two flanges (23) are fixedly connected by bolts (24) and fastening nuts (25).

8. The construction method of a photovoltaic flexible support inclined-stayed foundation in a desert according to claim 4, characterized in that: The following steps are involved: S1: The anchor rod is placed obliquely at the site where the inclined-stayed foundation is anchored. The push rod is pushed by external pressure to move the sliding support downward. The rotation hole of the rotary support circular plate is not aligned with the cylinder above the push rod, so that the anchor plate is contracted and fixed to the anchor rod side. The anchor rod is pressed into the stratum by a rotating pressure machine, and the anchor plate enters the underground. S2: Use high-pressure rotary jet grouting technology to grout the soil in the stratum at the depth where the anchor plate is located to strengthen the soil strength; then pull the push rod upward to make the anchor plate expand to the side away from the anchor rod until it is horizontal; S3: Grouting is performed into the grouting pipe through the grouting device on the ground, and the grouting is sprayed to the strata above and below the upper spiral blade through the grouting nozzle; S4: The grouting is monitored in real time by means of a humidity sensor installed on the side wall of the anchor bolt. When the humidity sensor detects that the grouting meets the qualified requirements, the grouting device is turned off and the grouting is stopped; S5: Install the foundation anchor on the top of the anchor rod, and put the U-shaped bracket tie rod anchor on the foundation anchor; when the flexible bracket tie rod is pulled to a suitable length in the U-shaped bracket tie rod anchor, lock the threaded lock.

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