Photovoltaic support miniature cast-in-place pile construction method

Abstract

The invention relates to the technical field of photovoltaic support miniature cast-in-place pile construction, and discloses a photovoltaic support miniature cast-in-place pile construction method which comprises a crawler-type down-the-hole drill, an air compressor, a drill hole, a sleeve, a reinforcement cage, pouring concrete, a lower stand column, a pile casing and a concrete vibrating rod. Compared with a traditional rotary drilling rig and a percussion drilling rig, the drilling rig has the advantages that hole forming is achieved through dry operation, mud pits do not need to be constructed, damage to vegetation and soil of the mountain land is reduced, construction noise is low, green construction is achieved, and the drilling rig is suitable for large-scale popularization and application. The device can effectively drill holes in both hard rocks and soft soil layers, is particularly suitable for mountainous rugged terrains, is simple in structure and low in manufacturing cost, can simultaneously arrange a plurality of devices for simultaneous operation, improves the operation efficiency, and saves the construction period.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic support micro-cast-in-place pile construction, and in particular to a photovoltaic support micro-cast-in-place pile construction method. Background Art

[0002] Fixed support foundation construction is a key link in photovoltaic power generation projects. It is directly related to the installation stability and service life of photovoltaic modules. At present, common foundation construction methods include traditional rotary drilling rig construction, impact drilling rig construction, etc. Although these methods are widely used in flat areas, they have many limitations in areas with complex terrain such as mountains and hills, such as slow displacement, difficulty in discharging mud pools, and high cost of single pile construction. With the continuous increase in photovoltaic projects, how to carry out fixed support foundation construction efficiently and at low cost has become an urgent problem to be solved.

[0003] The traditional rotary drilling construction method usually uses a large rotary drilling rig for drilling. This method shows good results in flat areas, but in places with complex terrain such as mountains and hills, due to problems such as slow displacement and difficulty in discharging mud pools, the construction efficiency is low and the cost is high. In addition, the impact drilling construction method uses impact vibration to drill holes. Although it can overcome terrain restrictions to a certain extent, it is noisy, energy-intensive, and has a greater impact on the environment.

[0004] Therefore, when dealing with complex terrain, existing construction methods generally have problems such as slow equipment movement, low construction efficiency and high cost. At the same time, traditional rotary drilling rigs and impact drilling rigs will produce a large amount of mud during the construction process, which requires a special mud pool for discharge. This not only increases the difficulty of construction, but may also cause damage to the environment. In addition, the high noise and high energy consumption of these two methods do not meet the requirements of modern green construction. Summary of the invention

[0005] The present invention provides a construction method for micro-cast-in-place piles of photovoltaic brackets, which has the advantages of convenient construction, high construction efficiency, environmental protection and energy saving, easy movement of construction equipment, small requirements for construction sites, and can effectively drill holes in both hard rocks and soft soil layers, especially suitable for undulating mountain terrain. The equipment has a simple structure and low cost, and multiple devices can be arranged to work at the same time, which improves work efficiency and saves construction time. Dry operation is used for hole drilling, and there is no need to construct a mud pool. The working surface is small, which reduces the damage to mountain vegetation and soil, and the construction noise is small, achieving the advantages of green construction, and solving the problems raised by the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a photovoltaic support micro-cast-in-place pile construction method, including a crawler down-the-hole drill, an air compressor, a borehole, a casing, a steel cage, poured concrete, a lower column, a casing and a concrete vibrator, the crawler down-the-hole drill including a drill bit, the drill bit is installed on the crawler down-the-hole drill, the crawler down-the-hole drill is assembled and connected to the air compressor, and the air compressor is located on the top of the crawler down-the-hole drill.

[0007] As a preferred technical solution of the present invention, the crawler down-the-hole drill utilizes a drill bit to spirally drill into the soil to form a borehole.

[0008] As a preferred technical solution of the present invention, a casing is placed in the drill hole, and the top of the hole is protected by a guard plate.

[0009] As a preferred technical solution of the present invention, a steel cage is placed in the drilled hole, and concrete is poured at the same time, and vibrated using a concrete vibrator.

[0010] As a preferred technical solution of the present invention, when the pile body in the drilled hole is poured with concrete to a position 0.8 m away from the hole mouth, the lower column is inserted into the concrete in the hole.

[0011] As a preferred technical solution of the present invention, a pile top casing is placed above the lower column, and concrete is poured continuously until the top of the casing, and the force of pouring concrete is used to insert the lower column into the pile bottom.

[0012] As a preferred technical solution of the present invention, the drill bit adopts different types of drill bits, such as using an alloy drill bit in hard rock and a diamond drill bit in soft soil.

[0013] As a preferred technical solution of the present invention, the crawler down-the-hole drill is used in combination with an air compressor to modify a traditional rotary drilling rig to perform micro bored pile drilling construction.

[0014] The present invention has the following beneficial effects: 1. This photovoltaic support micro-cast-in-place pile construction method adopts a method combining an air compressor and a down-the-hole drill. The equipment is easy to move and has low requirements for the construction site. It can be quickly constructed under complex terrain conditions such as mountains and hills, and the construction efficiency is significantly improved. Compared with traditional rotary drilling rigs and impact drilling rigs, the equipment used in this solution has a simple structure and low cost. Multiple devices can be arranged to work at the same time, which greatly reduces the construction cost. Dry drilling is adopted, and there is no need to construct a mud pool, which reduces the damage to mountain vegetation and soil. The construction noise is small, and green construction is achieved.

[0015] 2. This photovoltaic support micro-cast-in-place pile construction method ensures the integrity and stability of the pile foundation through strict construction technology and quality control measures, improves the installation quality of the fixed support, and extends the service life of the photovoltaic module. The cast-in-place piles drilled by the air compressor have less impact on the environment during the construction process. It adopts dry operation to drill holes, and there is no need for wall protection mud sewage discharge, which reduces damage to mountain vegetation and soil. The drilling rig construction noise is small, which reduces interference with the lives of residents around the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the drilling structure of the present invention; Figure 2 This is a schematic diagram of the structure of the concrete vibrator of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the installation of the upper column and the bracket structure of the present invention; Figure 5 It is a construction schematic diagram of the present invention.

[0017] In the figure: 1. crawler down-the-hole drill; 11. drill bit; 2. air compressor; 3. drilling; 4. casing; 5. steel cage; 6. pouring concrete; 7. lower column; 8. casing; 9. concrete vibrator. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-5 A photovoltaic support micro-cast-in-place pile construction method includes a crawler down-the-hole drill 1, an air compressor 2, a borehole 3, a casing 4, a steel cage 5, poured concrete 6, a lower column 7, a casing 8 and a concrete vibrator 9. The crawler down-the-hole drill 1 includes a drill bit 11, which is installed on the crawler down-the-hole drill 1. The crawler down-the-hole drill 1 is assembled and connected to the air compressor 2, and the air compressor 2 is located on the top of the crawler down-the-hole drill 1.

[0020] In a preferred embodiment, the crawler down-the-hole drill 1 utilizes the drill bit 11 to spirally drill into the soil to form the borehole 3 .

[0021] Assemble the crawler down-the-hole drill 1 and the air compressor 2, start the drilling 3 equipment, and drill according to the set parameters. During the drilling process, pay close attention to the equipment operation status, drilling speed, excavation conditions, etc., and adjust the parameters in time according to the actual situation. During the drilling process, the pressure of the air compressor 2 is controlled within the range of 0.7-0.9MPa. When encountering changes in the rock layer or other abnormal conditions, suspend drilling, analyze the causes and take corresponding measures, such as replacing the drill bit 11, adjusting the impact frequency, etc. Before the full start of construction, a trial drilling 3 should be carried out to test the geological hole forming conditions and hole forming stability in the project site.

[0022] In a preferred embodiment, a casing 4 is placed in the borehole 3, and the top of the hole is protected by a guard plate.

[0023] After each pile hole is completed, it is necessary to measure the hole depth, verticality, hole diameter and sediment layer thickness, etc. After confirming that it meets the design requirements, sprinkle water on the bottom of the hole to moisten it, and then manually tamp the base. At the same time, lower the casing 4 and protect the top of the hole to prevent slag from falling in the hole and affecting the hole depth, causing the hole to be cleaned again during the later pouring. Mechanical drilling requires that under the condition that the hole depth meets the requirements, while using lead wire to check the spacing between the strings, a diagonal inspection method must be added to ensure that the center deviation of the pile hole does not exceed 5mm.

[0024] In a preferred embodiment, a steel cage 5 is placed in the borehole 3 , and concrete 6 is poured at the same time, and vibrated using a concrete vibrator 9 .

[0025] After the steel bars are transported to the site, they are first inspected on site before processing to check whether the quality certification documents and factory certificates provided by the manufacturer meet the requirements. Secondly, the steel bars are sampled under the witness of the supervisor and then sent to the laboratory to test their relevant performance. They are used in this project only after they meet the design requirements. The appearance quality of the manufactured steel cage 5, the spacing of steel bars of different specifications and models, the binding effect, etc. are checked against the requirements of the design drawings to check whether they meet the design requirements, so as to better ensure the quality of pile formation of the subsequent support foundation. After the steel cage 5 is manufactured by the operating personnel, it must be inspected and accepted on-site by the construction supervision personnel of all parties before the steel cage 5 can be lowered. When lowering the steel cage 5, its appearance quality should be checked again. If the steel cage 5 is deformed or twisted, the operating team should re-ship it to the steel cage 5 manufacturing area for adjustment and verification to meet the requirements. At the same time, if it is found that the installation position of the steel cage 5 is offset or the thickness of the surrounding protective layer is uneven during the pouring process, it should be adjusted in time during the concrete pouring process to ensure the quality of the pile.

[0026] In a preferred embodiment, when the pile body in the drilled hole 3 is poured with concrete 6 to a distance of 0.8 m from the hole opening, the lower column 7 is inserted into the concrete in the hole.

[0027] When the pile body concrete is poured to a distance of 0.8 m from the hole mouth, the lower column 7 is inserted into the concrete in the hole.

[0028] In a preferred embodiment, a pile top casing 8 is placed above the lower column 7, and concrete 6 is continuously poured until the top of the casing, and the force of pouring concrete 6 is used to insert the lower column 7 into the bottom of the pile.

[0029] The lower column 7 is inserted into the concrete in the hole, and the pile top casing 8 is placed at the same time. Then, the concrete is poured until the top of the casing 8. The force of the concrete vibrator 9 is used to insert the lower column 7 to the bottom of the pile. The elevation of the top of the lower column 7 is observed in real time with measuring equipment to ensure that the design requirements are met.

[0030] In a preferred embodiment, the drill bit 11 uses different types of drill bits 11, such as using an alloy drill bit 11 in hard rock and using a diamond drill bit 11 in soft soil.

[0031] The construction equipment is easy to move and has low requirements for the construction site. It can effectively drill holes in both hard rock and soft soil. It is especially suitable for mountainous terrain. The equipment has a simple structure and low cost.

[0032] In a preferred embodiment, the crawler down-the-hole drill 1 and the air compressor 2 are used in combination to modify the traditional rotary drilling rig to perform micro bored pile drilling 3 construction.

[0033] The method of combining an air compressor and a down-the-hole drill makes the equipment easy to move and has low requirements for the construction site. It can be quickly constructed under complex terrain conditions such as mountains and hills, significantly improving construction efficiency. Compared with traditional rotary drilling rigs and impact drilling rigs, the equipment used in this solution has a simple structure and low cost.

[0034] The construction of fixed support foundation is a key link in photovoltaic power generation projects. It is directly related to the installation stability and service life of photovoltaic modules. A stable foundation can resist the influence of natural factors such as wind and rain erosion and soil settlement, and ensure the normal operation of the photovoltaic system. Considering the load of photovoltaic equipment and the overall economy of the project, this construction method uses micro-cast piles for base reinforcement. The micro-pile length is 2.3 to 2.5m and the pile diameter is 250mm. If the traditional rotary drilling rig is used for construction, the displacement is slow in mountainous and hilly areas, and the mud pool is difficult to discharge. In addition, the cost of single pile construction is high and the economic performance is poor. The exploration of fixed support micro-cast pile foundation construction technology not only helps to improve the construction quality of photovoltaic power generation projects, but also helps to improve the construction quality of photovoltaic power generation projects. The amount will also help promote technological progress in the entire industry. This construction method targets the micro bored piles of the project. Combined with the topography of the project, various drilling machines are compared repeatedly, the traditional rotary drilling rig is modified, and an air compressor and a down-the-hole drill are used in combination to carry out micro bored pile drilling construction. The construction strata of the project construction site are mainly weathered rock strata. On the whole, there are no adverse physical geological phenomena such as landslides, collapses, and mud-rock flows that restrict engineering construction. The overall natural slope is stable and the engineering geological conditions of the site are good. This process method mainly describes the construction of micro bored piles. Its main work content includes equipment installation, drilling construction, concrete pouring, and insertion of column embedded parts, etc., which can be applied to subsequent similar engineering construction.

[0035] The construction process and operation points of this plan mainly include: measurement and layout, equipment and material preparation, site cleaning, drilling 3 position positioning, drilling 3 operation, hole completion acceptance, steel cage 5 production and lowering, cast-in-place pile casting, buried lower column 7, trial pile test. The specific operation steps include: measurement and layout, use professional measuring instruments, determine the drilling 3 position according to the design drawings, and make marks, conduct detailed measurements of the mountain terrain, and provide data for equipment placement and drilling 3 parameter adjustment; equipment and material preparation, select suitable drilling 3 equipment, check equipment performance, prepare drill bits 11, drill rods, oil and other materials, and select different types of drill bits 11 according to geological conditions, such as alloy drill bits 11, diamond drill bits 11, etc.; site cleaning, remove the surrounding of the drilling 3 position Obstacles, including trees and stones, etc., are removed, and construction channels are opened to ensure smooth passage of equipment and personnel; for positioning of borehole 3, surveyors must undergo professional training, operate in strict accordance with measurement specifications, use high-precision measuring instruments, and repeatedly check the coordinates of borehole 3 to ensure accurate positioning. When marking the position of borehole 3, obvious markers, such as wooden stakes and colorful flags, are used, and records are kept for easy search in subsequent construction; assemble equipment, assemble crawler down-the-hole drill 1 and air compressor 2, start the borehole 3 equipment, and drill according to the set parameters. During the drilling process, pay close attention to the equipment operating status, drilling speed, excavation conditions, etc., and adjust parameters in time according to actual conditions. During the drilling process, the pressure of air compressor 2 is controlled at 0.7-0.Within the range of 9MPa, when encountering changes in the rock layer or other abnormal conditions, suspend drilling, analyze the reasons and take corresponding measures, such as replacing the drill bit 11, adjusting the impact frequency, etc. Before the full start of construction, a trial drilling 3 should be carried out to test the geological hole conditions and hole stability in the project site; for hole acceptance, after each pile hole is completed, it is necessary to measure the hole depth, verticality, hole diameter and sediment layer thickness, etc. After confirming that it meets the design requirements, sprinkle water on the bottom of the hole to moisten it, and then manually tamp the base, while lowering the casing 4 and protecting the top of the hole to prevent slag from falling in the hole and affecting the hole depth, causing the hole to be cleaned again in the later pouring, Mechanical drilling requires that under the condition that the hole depth meets the requirements, while using lead wire to check the spacing between the strings, a diagonal inspection method must be added to ensure that the center deviation of the pile hole does not exceed 5mm; the steel cage 5 is made and lowered, and the steel bars are transported to the site for on-site acceptance before processing to check whether the quality certification documents and factory certificates provided by the manufacturer meet the requirements. Secondly, the steel bars are sampled under the witness of the supervisor and then submitted to the laboratory for testing of their relevant properties. They are used in this project only after they meet the design requirements. The appearance quality of the manufactured steel cage 5, different specifications and types are checked against the requirements of the design drawings. Whether the spacing of the steel bars, the binding effect, etc. meet the design requirements, and better ensure the quality of the piles of the subsequent support foundation, after the steel cage 5 is formed by the operating personnel, it must be inspected and accepted on-site by the construction supervision personnel of all parties before the steel cage 5 can be lowered. When lowering the steel cage 5, its appearance quality should be checked again. If the steel cage 5 is deformed or twisted, the operating team should re-ship it to the steel cage 5 production area for adjustment and verification to meet the requirements. At the same time, if the installation position of the steel cage 5 is found to be offset or the thickness of the surrounding protective layer is uneven during the pouring process, it should be checked during the concrete pouring process and Adjust in time to ensure the quality of the pile; when pouring cast-in-place piles, concrete should be poured continuously without interruption to ensure the integrity of the pile body. Each time concrete is poured into the pile pipe, as much concrete as possible should be poured, and it should be poured to the hole mouth at one time. While pouring concrete, use a concrete vibrator 9 to compact it to prevent pile breakage or "neck shrinkage" accidents. The transportation capacity of concrete must meet the needs of the setting speed of concrete and the pouring speed to ensure the uniformity of concrete and the specified slump. When the concrete surface is close to the natural ground, the concrete should be poured slowly to reduce the impact force of the concrete; bury the lower column 7, and pour the pile body concrete to a distance of 0.8m, insert the lower column 7 into the concrete in the hole, and place the pile top casing 8 at the same time, then continue to pour concrete until the top of the casing 8, use the force of the concrete vibrator 9 to insert the lower column 7 to the bottom of the pile, and use the measuring equipment to observe the top elevation of the lower column 7 in real time to ensure that it meets the design requirements; pile test, after the pile foundation construction is completed, the bearing capacity should be tested in strict accordance with the "Technical Specifications for Building Foundation Pile Testing" (JGJ106-2014), static load test, apply vertical pressure, vertical pull or horizontal thrust step by step on the top of the pile, observe the settlement, pull displacement or horizontal displacement of the top over time, so as to determine the corresponding single pile vertical compressive bearing capacity, single pile vertical pull bearing capacity or single pile horizontal bearing capacity test method, after passing the test, install the upper column and bracket. .

[0036] The main advantages of this solution include convenient construction, high construction efficiency, environmental protection and energy saving, easy movement of construction equipment, low requirements for the construction site, and effective drilling of holes in both hard rock and soft soil. It is especially suitable for undulating mountain terrain. The equipment has a simple structure and low cost. Multiple devices can be arranged to work at the same time to improve work efficiency and save construction time. Dry drilling is adopted, and there is no need to build a mud pool. The working surface is small, which reduces the damage to mountain vegetation and soil. The construction noise is small, and green construction is achieved. Low-energy and low-pollution drilling equipment is selected, and effective dust and noise reduction measures are taken.

[0037] Compared with the prior art, this technical solution adopts a method combining air compressor and down-the-hole drill. The equipment is easy to move and has low requirements for the construction site. It can be quickly constructed under complex terrain conditions such as mountains and hills, significantly improving construction efficiency. Compared with traditional rotary drilling rigs and impact drilling rigs, the equipment used in this solution has a simple structure and low cost. Multiple devices can be arranged to work at the same time, greatly reducing construction costs. Dry operation is used to form holes, and there is no need to build a mud pool, which reduces damage to mountain vegetation and soil. The construction noise is low, and green construction is achieved. Through strict construction technology and quality control measures, the integrity and stability of the pile foundation are ensured, the installation quality of the fixed bracket is improved, and the service life of the photovoltaic module is extended. The bored piles formed by the air compressor down-the-hole drilling have little impact on the environment during the construction process. Dry operation is used to form holes, and there is no need to discharge wall mud sewage, which reduces damage to mountain vegetation and soil. The drilling rig construction noise is low, reducing interference with the lives of residents around the project.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic support micro-cast-in-place pile construction method, comprising a crawler-type down-the-hole drill (1), an air compressor (2), a borehole (3), a casing (4), a steel cage (5), pouring concrete (6), a lower column (7), a casing (8) and a concrete vibrator (9), characterized in that: The crawler down-the-hole drill (1) comprises a drill bit (11), wherein the drill bit (11) is mounted on the crawler down-the-hole drill (1), and the crawler down-the-hole drill (1) is assembled and connected to an air compressor (2), wherein the air compressor (2) is located on the top of the crawler down-the-hole drill (1).

2. A photovoltaic support micro-casting pile construction method according to claim 1, characterized in that: The crawler-type down-the-hole drill (1) utilizes a drill bit (11) to spirally drill into the soil to form a borehole (3).

3. A photovoltaic support micro-casting pile construction method according to claim 1, characterized in that: A casing (4) is placed inside the drill hole (3), and the top of the hole is protected by a guard plate.

4. A photovoltaic support micro-casting pile construction method according to claim 1, characterized in that: A steel cage (5) is placed in the borehole (3), and concrete (6) is poured at the same time, and vibrated using a concrete vibrator (9).

5. A photovoltaic support micro-casting pile construction method according to claim 1, characterized in that: When the pile body in the drilled hole (3) is poured with concrete (6) to a position 0.8 m from the hole opening, the lower column (7) is inserted into the concrete in the hole.

6. A photovoltaic support micro-casting pile construction method according to claim 1, characterized in that: A pile top casing (8) is placed above the lower column (7), and concrete (6) is continuously poured until the top of the casing is reached, and the force of the poured concrete (6) is used to insert the lower column (7) into the bottom of the pile.

7. A photovoltaic support micro-casting pile construction method according to claim 1, characterized in that: The drill bit (11) adopts different types of drill bits (11), such as using an alloy drill bit (11) in hard rock and using a diamond drill bit (11) in soft soil.

8. A photovoltaic support micro-casting pile construction method according to claim 1, characterized in that: The crawler-type down-the-hole drill (1) and the air compressor (2) are used in combination to modify a conventional rotary drilling rig to perform micro-cast-in-place pile drilling (3) construction.

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