Precise construction device and method for photovoltaic miniature cast-in-place pile

Abstract

The invention discloses an accurate construction device for a photovoltaic miniature cast-in-place pile, the accurate construction device comprises a remeasuring and positioning device, an upper component and a lower component, the remeasuring and positioning device comprises a GPS positioning device and a range finder, the GPS positioning device is used for pile foundation positioning and remeasuring, and the range finder is used for hole depth measurement; the upper component comprises a detachable sleeve, a pouring funnel, a bubble level and the like, the pouring funnel is in a big-end-up funnel shape, concrete pouring can be conveniently carried out on a miniature pile foundation, the lower component comprises a pile head steel mold and a fixing plug pin, and the pile head steel mold adopts a steel mold plate. The construction method is suitable for precise construction and intelligent rechecking of the photovoltaic miniature cast-in-place pile in strata such as gravel soil and silty soil and under the condition of poor communication signals, the manufacturing cost is low, operation is easy, detachability is high, intelligent positioning and perpendicularity control are integrated, and the construction efficiency is improved to a certain degree.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic power generation construction, and in particular relates to a precise construction device and a construction method for photovoltaic micro-cast-in-place piles. Background Art

[0003] Common photovoltaic support foundations include cast-in-place pile foundations, strip foundations, PHC pile foundations, spiral steel piles, etc. Cast-in-place piles are often used for photovoltaic support foundations because of their easy availability, controllable costs, and wide applicability. However, due to their small diameter, micro-cast-in-place piles often result in inaccurate positioning, difficult to control verticality, and traditional concrete pouring methods that easily cause material pollution and waste, and low pouring efficiency. In addition, the quality of construction personnel varies greatly, and refined management cannot keep up with the pace of industry development. The construction quality of cast-in-place pile foundations and embedded parts of photovoltaic power stations is difficult to guarantee. Summary of the invention

[0004] In order to overcome the technical problems in the prior art of inaccurate construction positioning, difficult verticality control and low concrete pouring efficiency of photovoltaic micro-cast-in-place piles due to their small pile diameter, the present invention provides a precise construction device and method for photovoltaic micro-cast-in-place piles, which are suitable for precise construction and intelligent verification of photovoltaic micro-cast-in-place piles in gravel soil, silt soil and other strata and under conditions of poor communication signals, and solve the above-mentioned technical problems.

[0005] The precise construction device for photovoltaic micro-cast-in-place piles includes three major parts: a re-measurement positioning device, an upper component and a lower component. The re-measurement positioning device includes a GPS positioning device and a distance meter. The GPS positioning device is used for re-measurement of pile foundation positioning, and the distance meter is used for hole depth measurement; the upper component includes a detachable sleeve, a pouring funnel, a grid, a positioning pin, and a bubble level. The pouring funnel is in the shape of a funnel with a large top and a small bottom, which is convenient for pouring concrete into the micro-pile foundation. The grid is provided with two layers. The first layer of the grid is in a "cross" shape, and the second layer of the grid is in a "field" shape, with the upper and lower layers staggered; the lower structure includes a pile head steel mold and a fixed pin. The pile head steel mold adopts a steel template with a thickness of 0.5mm-1.5mm, and the thickness of the galvanized layer is not less than 0.02mm.

[0006] In the above-mentioned precise construction device for photovoltaic micro-cast-in-place piles, the bubble level is arranged below the pouring funnel.

[0007] The above-mentioned precise construction device for photovoltaic micro-cast-in-place piles has a lower opening diameter of the casting funnel that is 2 mm larger than one side of the micro-cast-in-place pile, a line connecting the upper opening and the lower opening forms an angle of 45°, and a height of 30 cm.

[0008] The above-mentioned precise construction device for photovoltaic micro-cast-in-place piles, the fixed pin adopts a wedge-shaped cylindrical rod with a length of ≥30cm and a diameter of ≥φ16.

[0009] Method for manufacturing an accurate construction device for photovoltaic micro-piles, characterized in that the manufacturing method comprises the following steps:

[0010] S1: Use galvanized steel plates and positioning steel bars to fabricate a pouring funnel. The positioning steel bars are perpendicular to each other, and a GPS bracket is welded at the center for positioning the center point of the pile position. The bracket is welded with round steel;

[0011] S2: Use galvanized steel plates to fabricate a detachable sleeve. The diameter of the sleeve is the same as the lower opening of the pouring funnel. The detachable sleeve is fabricated in three sections. The first and second sections are respectively welded with a first-layer grid and a second-layer grid at the bottom. The first-layer grid is in a "cross" shape, and the second-layer grid is in a "field" shape, and the upper and lower layers are staggered;

[0012] S3: Weld the detachable sleeve, the pouring funnel, and the bubble level;

[0013] S4: Use galvanized steel plates to fabricate a pile head steel mold. A positioning pin is provided at the top of the steel mold, and a bayonet is provided at the end of the positioning pin;

[0014] S5: Weld the fixed pin to the pile head steel mold;

[0015] S6: Install the GPS device and assemble the upper components and the lower components.

[0016] Construction method for an accurate construction device for photovoltaic micro-piles, characterized in that the construction method comprises the following steps:

[0017] S1: Measurement layout and positioning. According to the general layout plan of the pile positions, obtain the positioning coordinates of each square matrix. Use surveying instruments to calibrate each control point. After calibration, use the GPS positioning device to horizontally position each pile foundation point and the foundation axis. Each array uses a steel wire rope to ensure that the pile foundations in the same array are at the same elevation on the same straight line or within the designed specified inclination range;

[0018] S2: Bored pile construction. Before drilling, remove the obstacles at the hole position and around it. According to the measured layout points, the drill bit is vertically aligned with the points. During the drilling process, water is poured into the hole, and the floating soil in the hole is removed by drilling up and down multiple times and repeatedly;

[0019] S3: Installation of the bored pile steel cage and embedded parts. The steel cage is fabricated by the manual binding method. After the steel bars are processed, insert 3 main steel bars into the spiral of the stirrups to control the equal spacing. The contact points between the main steel bars and the stirrups are completely bound by 100%. When lowering the steel cage, align the center of the steel cage with the designed center position of the pile and pour concrete in a timely manner;

[0020] S4: Precise construction of bored piles. Before pouring, check whether the center position, verticality and diameter of the pile hole meet the design requirements based on the GPS positioning device and bubble level. Clean the hole before pouring to ensure that there is no loose soil and weeds in the hole. The thickness shall not exceed 30mm. During the pouring process, the embedded parts are fixed on the fixed pins, and the concrete is unloaded from the pouring funnel. The pile foundation is cast in one step, and then vibrated and compacted with a steel chisel or vibrating rod. After the pouring is completed, the finished product maintenance work is done well.

[0021] S5: Pile head concrete maintenance: after the concrete pouring is completed, remove the upper components and positioning re-measurement device, use a trowel to scrape off the floating slurry on the concrete surface and smooth the concrete surface, then cover it with plastic film in time.

[0022] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0023] 1. The photovoltaic micro-casting pile precision construction device of the present invention can be applied to the photovoltaic micro-casting pile precision construction in gravel soil, silt soil and other strata and under conditions of poor communication signals. It has low production cost, simple operation, strong disassembly, intelligent positioning and verticality control integration, which improves the construction efficiency to a certain extent;

[0024] 2. The application of this device can replace 4 conventional hole quality inspections at one time, saving 80% of the inspection process, of which 40% of the inspection process can be saved for the main control project; it can replace 5 conventional embedded parts quality inspections at one time, saving 62.5% of the inspection process; it can replace 1 conventional cast-in-place pile quality standard quality inspection at one time, saving 12.5% ​​of the inspection process, of which 12.5% ​​of the inspection process can be saved for the main control project;

[0025] 3. The photovoltaic micro-cast-in-place pile precision construction device of the present invention can effectively control the micro-cast-in-place pile positioning deviation, verticality, pile head appearance and other quality problems, and can effectively reduce the concrete loss rate and reduce costs, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0027] Figure 1 It is a front view of the precise construction device for photovoltaic micro-cast-in-place piles of the present invention;

[0028] Figure 2 A top view of the precise construction device for photovoltaic micro-cast-in-place piles of the present invention;

[0029] Figure 3 The process flow chart of the invention for the precise construction of photovoltaic micro-cast-in-place piles and the construction of the core device;

[0030] In the figure: 1-GPS positioning device, 2-bubble level, 3-detachable sleeve, 4-pouring funnel, 5-first layer grid, 6-second layer grid, 7-positioning pin, 8-fixing pin, 9-distance meter. DETAILED DESCRIPTION

[0031] like Figure 1 and Figure 2 As shown, it is a front view and a top view of the precise construction device for photovoltaic micro-cast-in-place piles of the present invention, which includes a re-measurement positioning device, an upper component and a lower component. The re-measurement positioning device includes a GPS positioning device 1 and a rangefinder 9. The GPS positioning device 1 is used for pile foundation positioning re-measurement, and the rangefinder 9 is used for hole depth measurement. The upper component includes a detachable sleeve 3, a casting funnel 4, a grid, a positioning pin 7, and a bubble level 2. The bubble level 2 is arranged below the casting funnel 4. The casting funnel 4 is in the shape of a funnel with a larger upper part and a smaller lower part, which is convenient for pouring concrete into the micro-pile foundation. The diameter of the lower opening of the casting funnel 4 is 2 mm larger than that of the single side of the micro-cast-in-place pile, and the line connecting the upper opening and the lower opening forms an angle of 45°, and the height is 30 cm.

[0032] The grille is provided with two layers, the first layer grille 5 is in a "cross" shape, the second layer grille 6 is in a "field" shape, and the upper and lower layers are staggered.

[0033] The lower structure includes a pile head steel mold and a fixed pin 8. The pile head steel mold adopts a steel template with a thickness of 0.5mm-1.5mm and a galvanized layer thickness of not less than 0.02mm. The fixed pin 8 adopts a wedge-shaped cylindrical rod with a length of ≥30cm and a diameter of ≥φ16mm.

[0034] A method for manufacturing a photovoltaic micro-cast-in-place pile precision construction device comprises the following steps:

[0035] Step 1: Use galvanized steel plate (where the thickness of the galvanized layer is not less than 0.02mm) and positioning steel bars with a diameter of φ6mm to make a pouring funnel 4. The φ6mm positioning steel bars are perpendicular to each other. The center-welded GPS bracket is used to locate the center point of the pile position. The bracket is welded with round steel with a diameter greater than φ10;

[0036] Step 2: Use galvanized steel plate (wherein the thickness of the galvanized layer is not less than 0.02mm) to make a removable sleeve 3, the diameter of the removable sleeve 3 is consistent with the lower opening of the pouring funnel 4, and the removable sleeve 3 is made in three sections. The first layer of grille 5 and the second layer of grille 6 are welded at the bottom of the first and second sections, wherein the first layer of grille 5 is in a "cross" shape, and the second layer of grille 6 is in a "field" shape, and the upper and lower layers are staggered;

[0037] Step 3: Weld three sections of detachable sleeve 3, pouring funnel 4 and bubble level 2;

[0038] Step 4: Use galvanized steel plate (wherein the thickness of the galvanized layer is not less than 0.02mm) to make a pile head steel mold, and set a positioning pin 7 on the top of the steel mold. The positioning pin 7 is in the form of a bolt, and the length reaches the fixed embedded part. A bayonet is set at the end, which is not only a bolt connecting the upper component and the lower component, but also a positioning device for fixing the embedded part;

[0039] Step 5: Weld the fixed pin 8 and the pile head steel mold. The fixed pin 8 is a wedge-shaped steel rod with a length of ≥30cm and a diameter of ≥φ16;

[0040] Step six: Install the GPS positioning device 1 and assemble the upper and lower components. When using, a batch of lower components should be reasonably produced according to the actual situation. Insert the lower components first, then install the upper components and the re-positioning device and effectively correct the position and verticality, then pour concrete to the top of the pile head and install the embedded parts, and finally transfer the upper components and the re-positioning device to the next pile, and repeat this cycle.

[0041] The construction method of the photovoltaic micro-cast-in-place pile precision construction device and the overall construction process of the pile foundation are as follows: Figure 3 As shown, the construction method includes the following steps: line measurement → site leveling and foundation center positioning → drilling → lower steel cage → installation of the device → concrete pouring → embedded parts installation → pile head template removal → pile head maintenance:

[0042] Step 1: Measurement, setting out and positioning. According to the general plan layout of the pile positions, the positioning coordinates of each array can be obtained. After calibration, each pile foundation point and foundation axis are horizontally positioned using GPS. Each array uses a wire rope to ensure that the elevation of the pile foundation of the same array is on the same straight line or within the inclination range specified in the design.

[0043] Step 2: Boring construction of bored piles. Before drilling, clear the hole and surrounding stones and other obstacles. According to the measured points, the drill bit is vertically aligned with the points. During the drilling process, a proper amount of water is poured into the hole, and the loose soil in the hole is removed by drilling up and down repeatedly.

[0044] When installing the drill bit, the drill bit diameter should be confirmed first to ensure that the hole diameter meets the design requirements;

[0045] Before starting the machine, the joystick should be placed in the neutral position. After starting, an idling test should be conducted to check that the instrumentation, sound system, brakes, etc. are working properly before operation can begin.

[0046] When drilling, the drill arm should be fixed first, the drill bit should be aligned with the hole, and the verticality of the drill rod should be adjusted;

[0047] After the operation, the drill rod and drill bit should be lifted out of the hole, the soil on the drill rod and drill bit should be cleared first, all parts should be braked, the joystick should be put in the neutral position, and the power should be cut off; when the drill bit diameter is worn to 20mm, it should be replaced.

[0048] After the hole is formed, attention should be paid to protecting the pile hole. This device can replace 4 times of conventional hole-forming quality inspections at one time (the hole-forming quality standards and inspection methods are shown in Table 1), with a replacement rate of 80%, saving 80% of the inspection procedures, and 40% of the inspection procedures can be saved for the main control items.

[0049] Table 1 Quality Standards and Inspection Methods for Cast-in-Place Pile Hole Formation

[0050]

[0051] Step 3: Installation of the steel cage and embedded parts for bored cast-in-place piles. For the installation of the steel cage and embedded parts of bored cast-in-place piles, the steel cage is fabricated by manual binding method. After the steel bars are processed, insert 3 main steel bars into the spiral stirrups and control the equal spacing. The contact points between the main steel bars and the stirrups are completely bound at 100%. When lowering the steel cage, align the center of the steel cage with the designed center position of the pile and pour concrete in a timely manner. The embedded parts are embedded according to the requirements of the design drawings, and the embedded depth is key to control. The quality standards and inspection methods for the steel cage and embedded parts are shown in Table 2 and Table 3 respectively.

[0052] This device can replace 5 times of conventional embedded part quality inspections at one time, with a replacement rate of 62.5% in the construction inspection stage, saving 62.5% of the inspection procedures.

[0053] Table 2 Quality Standards and Inspection Methods for Steel Cage

[0054]

[0055] Table 3 Quality Standards and Inspection Methods for Embedded Parts

[0056]

[0057]

[0058] Step 4: Precise construction of bored cast-in-place piles. Before pouring, check whether the center position, verticality, and pile hole diameter of the pile hole meet the design requirements according to the GPS positioning device 1 and the bubble level 2. Clean the inside of the hole before pouring to ensure that there is no floating soil and weeds inside the hole, and the thickness shall not exceed 30 mm. Fix the embedded parts on the fixed pin 8 during the pouring process. The concrete is discharged from the pouring funnel 4, and the pile foundation is poured in one go, and then vibrated and compacted with a steel rod or a vibrating rod. Do a good job in the finished product maintenance after pouring.

[0059] The quality standards and inspection methods for cast-in-place piles are shown in Table 4. This device can replace 1 time of conventional cast-in-place pile quality standard inspection at one time, with a replacement rate of 12.5% in the construction inspection stage, saving 12.5% of the inspection procedures, and 12.5% of the inspection procedures can be saved for the main control items.

[0060] Table 4 Quality standards and inspection methods for cast-in-place piles

[0061]

[0062]

[0063] Step 5: Pile head concrete maintenance. After the concrete pouring is completed, remove the upper components and positioning re-measurement device, use a trowel to scrape off the floating slurry on the concrete surface and smooth the concrete surface, then cover it with plastic film in time.

[0064] At room temperature, concrete is cured by sprinkling water and covered with plastic film to keep it moist. When sprinkling water is used for curing, the number of times the pile head is sprinkled should be enough to keep the concrete surface sufficiently moist.

[0065] Covering and curing is adopted for winter concrete pouring construction of pile foundation. After the concrete is constructed, plastic tarpaulin is used to cover the surface tightly, and quilt + original soil is used to cover and seal it to ensure the curing temperature of concrete. A special person is assigned to check the curing condition of concrete. After the concrete reaches the critical strength of curing, it is covered with quilt and continues to be cured.

Claims

1. A precise construction device for photovoltaic micro-cast-in-place piles, characterized in that: It consists of three parts: a complex positioning device, an upper component and a lower component; The re-measurement positioning device comprises a GPS positioning device (1) and a distance meter (9), wherein the GPS positioning device (1) is used for pile foundation positioning re-measurement, and the distance meter (9) is used for hole depth measurement; The upper component comprises a detachable sleeve (3), a pouring funnel (4), a grid, a positioning pin (7), and a bubble level (2); the pouring funnel (4) is in the shape of a funnel with a larger top and a smaller bottom, so as to facilitate the pouring of concrete into the micro-pile foundation; the grid is provided with two layers, the first layer of grid (5) is in the shape of a "cross", and the second layer of grid (6) is in the shape of a "field", and the upper and lower layers are arranged in a staggered manner; The lower structural parts include a pile head steel mold and a fixed bolt (8). The pile head steel mold adopts a steel template with a thickness of 0.5mm-1.5mm and a zinc coating thickness of not less than 0.02mm.

2. The precise construction device for photovoltaic micro-cast-in-place piles according to claim 1 is characterized in that: The bubble level (2) is arranged below the pouring funnel (4).

3. The precise construction device for photovoltaic micro-cast-in-place piles according to claim 1 is characterized in that: The diameter of the lower opening of the pouring funnel (4) is 2 mm larger than that of one side of the micro-cast-in-place pile, and the line connecting the upper opening and the lower opening forms an angle of 45°, and the height is 30 cm.

4. The precise construction device for photovoltaic micro-cast-in-place piles according to claim 1 is characterized in that: The fixing pin (8) is a wedge-shaped cylindrical rod with a length of ≥30 cm and a diameter of ≥φ16.

5. The method for manufacturing a photovoltaic micro-casting pile precision construction device according to claim 1, characterized in that: The preparation method comprises the following steps: S1: A pouring funnel (4) is made of galvanized steel plates and positioning steel bars, the positioning steel bars are perpendicular to each other, and a centrally welded GPS bracket is used to locate the center point of the pile position. The bracket is welded with round steel; S2: A detachable sleeve (3) is made of galvanized steel plate, the diameter of the sleeve is consistent with the lower opening of the pouring funnel (4), and the detachable sleeve (3) is made in three sections. The first layer of grilles (5) and the second layer of grilles (6) are welded to the bottom of the first and second sections respectively, wherein the first layer of grilles (5) is in a "cross" shape, and the second layer of grilles (6) is in a "field" shape, and the upper and lower layers are staggered; S3: welded detachable sleeve (3), pouring funnel (4) and bubble level (2); S4: A pile head steel mold is made of galvanized steel plate, a positioning pin (7) is arranged on the top of the steel mold, and a bayonet is arranged at the end of the positioning pin (7); S5: welding the fixing pin (8) and the pile head steel mold; S6: Install the GPS device and assemble the upper and lower components.

6. The construction method for the photovoltaic micro-cast-in-place pile precision construction device according to claim 1, characterized in that: The construction method comprises the following steps: S1: Surveying, setting out and positioning. According to the general plan layout of the pile positions, the positioning coordinates of each array are obtained. The control points are calibrated using a surveying instrument. After calibration, the GPS positioning device (1) is used to horizontally position each pile foundation point and the foundation axis. Steel wire ropes are used to pull each array to ensure that the elevation of the pile foundation of the same array is on the same straight line or within the inclination range specified in the design. S2: Construction of bored pile drilling. Before drilling, clear the hole and surrounding obstacles. According to the measured points, the drill bit is vertically aligned with the points. During the drilling process, water is poured into the hole, and the loose soil in the hole is removed by repeated drilling up and down several times. S3: Installation of bored pile reinforcement cage and embedded parts. The reinforcement cage is made by manual binding. After the reinforcement is processed, three main bars are inserted into the stirrup spiral to control the equal spacing. The contact points between the main reinforcement and the stirrup are 100% fully bound. When lowering the reinforcement cage, the center of the reinforcement cage is aligned with the designed center of the pile and the concrete is poured in time. S4: Precise construction of bored piles. Before pouring, the center position, verticality and diameter of the pile hole are checked according to the GPS positioning device (1) and the bubble level (2) to see whether they meet the design requirements. Before pouring, the hole is cleaned to ensure that there is no loose soil and weeds in the hole, and the thickness shall not exceed 30 mm. During the pouring process, the embedded parts are fixed on the fixed pins (8), and the concrete is discharged from the pouring funnel (4). The pile foundation is cast in one step, and then vibrated and compacted with a steel chisel or a vibrating rod. After the pouring is completed, the finished product is well maintained; S5: Pile head concrete maintenance: after the concrete pouring is completed, remove the upper components and positioning re-measurement device, use a trowel to scrape off the floating slurry on the concrete surface and smooth the concrete surface, then cover it with plastic film in time.

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