Wind farm pile cap foundation backfill structure and construction method

Abstract

The application discloses a wind farm pile cap foundation backfill structure and a construction method, and belongs to the field of wind farm construction foundations. The wind farm pile cap foundation backfill structure comprises a foundation pile, a foundation ring arranged on the lower side of the foundation pile, a plurality of first anchor rods for fixing the foundation ring, a main reinforcement arranged on the first anchor rods and arranged on the upper side of the foundation ring and in the foundation pile, and a steel bar group arranged in the foundation pile. The main reinforcement is prevented from shaking or bending to affect the stress of the foundation pile during construction, a plurality of arc-shaped plates can be used for workers to step on to construct, a construction frame does not need to be erected around, the construction efficiency can be improved to a certain extent, the plurality of arc-shaped plates can increase the stress surface on the outer side of the foundation pile, the bearing capacity and stability of the whole foundation structure are effectively improved, and reinforcement treatment in the later period is facilitated.

Description

Technical Field

[0001] This invention relates to the field of basic technology for wind farm construction, and in particular to a backfill structure and construction method for wind farm foundation. Background Technology

[0002] In current wind farm construction projects, the foundation is a key structure supporting wind power generation equipment. Its performance directly affects the operational stability and safety of the entire wind farm. Foundations are mainly divided into spread foundations, pile foundations, and rock anchor foundations. Among them, pile foundations use long piles as the foundation. The backfill structure of the foundation mainly includes the foundation and the backfill layer.

[0003] Currently, for ease of construction, the backfill structure of the foundation generally requires the excavation of a foundation pit of a certain depth and diameter, and the erection of scaffolding to lay the steel reinforcement in the foundation piles. This may increase the workload to some extent and affect the construction progress. Then, the foundation is poured and shaped, and finally, backfill material is filled around it. The foundation piles mainly rely on their own weight and their outer wall to provide a certain support capacity. Relying solely on gravity and outer wall support would require increasing the weight and diameter to support larger wind farm units, which may increase the amount of construction work and affect the construction efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a wind farm pier foundation backfill structure and construction method that can overcome or at least partially solve the above problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A backfill structure for a wind farm pier foundation includes: a foundation pile; a foundation ring disposed on the lower side of the foundation pile; a plurality of first anchor rods for installing and fixing the foundation ring; main reinforcement bars disposed on the first anchor rods and positioned on the upper side of the foundation ring, the main reinforcement bars being disposed within the foundation pile; a steel reinforcement group disposed within the foundation pile; a plurality of annular plates disposed on the outer side of the plurality of main reinforcement bars; a first backfill layer disposed on the outer side of the foundation pile, the annular plates being disposed within the first backfill layer; and a foundation base disposed on top of the foundation pile.

[0007] To further improve the stability of the main reinforcement bars, a positioning ring is provided between the tops of the multiple main reinforcement bars.

[0008] To facilitate on-site assembly, the annular plate further comprises multiple interlocking arc-shaped plates, which are detachably connected to the main ribs.

[0009] To facilitate the installation of the curved plate, preferably, a fixing plate is fixedly connected to the main rib, a first connecting ear is fixedly connected to the fixing plate, and a second connecting ear corresponding to the first connecting ear is fixedly connected to the curved plate.

[0010] To further improve the stability of the curved plate and the integration of the curved plate with the foundation pile, the curved plate is further provided with an embedded part on one side, which is located inside the foundation pile.

[0011] To facilitate subsequent reinforcement grouting, a positioning pipe is further included within the first backfill layer. The positioning pipe has multiple sets of through holes and is fixed by a second anchor rod.

[0012] To facilitate the blocking of the through hole, the upper end of the positioning tube is provided with a blocking cover, and a blocking piece matching the through hole is fixedly connected to the blocking cover.

[0013] To further enhance the integration of the arc-shaped plate and the positioning tube, a mounting block is detachably connected to the arc-shaped plate, and a fixing sleeve corresponding to the positioning tube is fixedly connected to the mounting block.

[0014] Preferably, a second backfill layer is provided on the upper side of the foundation pile and on the upper side of the first backfill layer.

[0015] A construction method for the backfill structure of a wind farm pier foundation mainly includes the following steps:

[0016] Step 1: Level and clean the construction site to ensure good working conditions, then conduct surveying and setting out to determine the installation location of the foundation piles;

[0017] Step 2: Excavation. Excavate a foundation pit with a set diameter and a specified depth, level the bottom of the foundation pit, and lay concrete to form a flat working surface. Before laying the concrete, pre-embed the first anchor rod.

[0018] Step 3: Install the main reinforcement bars onto the first anchor rod;

[0019] Step 4: Construct a ring-shaped slab on the outside of the main reinforcing bars;

[0020] Step 5: Using the ring plate as the construction work surface, workers stand on the ring plate to carry out construction and erect steel reinforcement groups between multiple main reinforcement bars;

[0021] Step 6: Install the template between the ring plates;

[0022] Step 7: Pour concrete into the area between multiple main reinforcement bars to form a foundation pile, and then install the foundation base onto the foundation pile at the top;

[0023] Step 8: Add sand and gravel between the foundation pile and the foundation pit, and compact the sand and gravel.

[0024] Compared with the prior art, the present invention provides a backfill structure for wind farm pier foundations, which has the following beneficial effects:

[0025] 1. The backfill structure of the wind farm foundation consists of multiple arc-shaped plates forming multiple ring plates. These arc-shaped plates are installed on the main reinforcement bars. The multiple ring plates can limit the main reinforcement bars in multiple directions, preventing them from shaking or bending during construction and affecting the stress on the foundation piles. At the same time, the multiple arc-shaped plates can provide workers with a platform to stand on during construction, eliminating the need for surrounding scaffolding. This allows for the creation of smaller foundation pits, which can improve construction efficiency to some extent. The multiple arc-shaped plates can increase the stress surface on the outer side of the foundation piles, with both the upper and lower sides of the arc-shaped plates serving as stress surfaces. This effectively improves the stability of the foundation piles and can reduce the construction height and diameter of the foundation piles to some extent, thereby reducing construction difficulty and improving construction efficiency.

[0026] 2. The backfill structure of the wind farm foundation is fixed by installing the formwork onto the first connecting lug during installation, which facilitates the formwork construction and improves construction efficiency. The curved plate is equipped with an embedded part, which is embedded into the formed foundation pile, thereby further improving the stability of the connection between the curved plate and the foundation pile, enhancing the auxiliary support capacity of the foundation pile, and thus effectively improving the bearing capacity and stability of the entire foundation structure.

[0027] 3. In the backfill structure of the wind farm foundation, high-pressure grouting is directly injected into the positioning pipe during the later reinforcement process. At this time, the grout overflows from multiple through holes, filling the internal voids. Simultaneously, after contacting the first backfill layer, it forms a whole, thereby improving the support capacity of the foundation piles to a certain extent. In specific implementation, since the first backfill layer is partially placed between the arc-shaped plates, after the later filling and grouting, the reinforced first backfill layer is embedded between two adjacent arc-shaped plates, thereby improving the integration of the foundation piles and the reinforced first backfill layer, and thus effectively improving the stability of the entire foundation structure.

[0028] The parts of this device not described herein are the same as or can be implemented using existing technologies. This invention prevents the main reinforcement bars from shaking or bending during construction, which could affect the load on the foundation piles. At the same time, multiple arc-shaped plates can be provided for workers to stand on during construction, eliminating the need for surrounding scaffolding and improving construction efficiency to a certain extent. The multiple arc-shaped plates can increase the load-bearing surface on the outside of the foundation piles, effectively improving the bearing capacity and stability of the entire foundation structure and facilitating subsequent reinforcement. Attached Figure Description

[0029] Figure 1 This is a cross-sectional schematic diagram of the backfill state of a wind farm foundation backfill structure proposed in this invention.

[0030] Figure 2 This is a schematic diagram of a backfill structure for a wind farm foundation proposed in this invention. Figure 1 ;

[0031] Figure 3 This is a schematic diagram of a backfill structure for a wind farm foundation proposed in this invention. Figure 2 ;

[0032] Figure 4 This is a cross-sectional schematic diagram of a wind farm pier foundation backfill structure proposed in this invention;

[0033] Figure 5 This is a schematic diagram of the unfolded structure of a wind farm pier foundation backfill structure proposed in this invention. Figure 1 ;

[0034] Figure 6 This is a schematic diagram of the unfolded structure of a wind farm pier foundation backfill structure proposed in this invention. Figure 2 ;

[0035] Figure 7 This invention proposes a backfill structure for wind farm pier foundations. Figure 6 Enlarged diagram of point A in the middle.

[0036] In the diagram: 1. Foundation ring; 101. First anchor rod; 102. Main reinforcement; 103. Positioning ring; 104. Fixing plate; 105. First connecting ear; 2. Arc plate; 201. Second connecting ear; 202. Embedded part; 203. Mounting block; 204. Fixing sleeve; 3. Positioning tube; 301. Through hole; 302. Covering plate; 303. Covering cover; 304. Second anchor rod; 4. Formwork; 5. Foundation pile; 501. First backfill layer; 502. Second backfill layer; 503. Foundation base. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Example 1: Refer to Figures 1-7A backfill structure for a wind farm foundation includes: a pile 5, and further includes: a foundation ring 1 disposed on the lower side of the pile 5; a plurality of first anchor rods 101 for installing and fixing the foundation ring 1; main reinforcement bars 102 disposed on the first anchor rods 101 and placed on the upper side of the foundation ring 1, and disposed inside the pile 5; a steel reinforcement group disposed inside the pile 5; a plurality of annular plates disposed on the outer side of the plurality of main reinforcement bars 102; a first backfill layer 501 disposed on the outer side of the pile 5, and the annular plates disposed inside the first backfill layer 501; and a foundation base 503 disposed on the top of the pile 5.

[0039] A positioning ring 103 is provided between the tops of multiple main reinforcing bars 102.

[0040] The annular plate includes multiple interlocking arc-shaped plates 2, which are detachably connected to the main rib 102.

[0041] During the construction of the wind farm foundation, the construction site is leveled and cleared to ensure good working conditions. Then, surveying and layout are carried out to determine the installation positions of the foundation piles 5. A foundation pit of a specified diameter and depth is excavated using an excavator or drilling rig, and concrete is laid at the bottom of the pit to create a level working surface. Before laying the concrete, the first anchor rod 101 is pre-embedded, and the main reinforcement bars 102 are installed onto the first anchor rod 101. A ring-shaped plate composed of multiple arc-shaped plates 2 is erected outside the main reinforcement bars 102.

[0042] Using the ring plate as the construction work surface, workers stand on the ring plate to carry out construction, erect steel reinforcement groups between multiple main reinforcement bars 102, install formwork 4 between the ring plates, pour concrete into the area between multiple main reinforcement bars 102 to form foundation piles 5, then install foundation base 503 on the top of the foundation piles 5, and finally add sand and gravel between the foundation piles 5 and the foundation pit, and compact the sand and gravel.

[0043] Multiple arc-shaped plates 2 are combined to form multiple ring plates. The arc-shaped plates 2 are installed on the main reinforcement 102. The multiple ring plates can limit the main reinforcement 102 in multiple directions to prevent the main reinforcement 102 from shaking or bending during construction and affecting the stress of the foundation pile 5. At the same time, the multiple arc-shaped plates 2 can provide workers to stand on for construction, so there is no need to set up scaffolding around it. A smaller foundation pit can be opened when opening the foundation pit, which can improve the construction efficiency to a certain extent.

[0044] During the stress process of the foundation pile 5, the stress-bearing surface on the outside of the foundation pile 5 can be increased by multiple arc plates 2. Both the upper and lower sides of the arc plates 2 can serve as stress-bearing surfaces, thereby effectively improving the stability of the foundation pile 5. To a certain extent, the construction height and diameter of the foundation pile 5 can be reduced, which can reduce the construction difficulty and improve the construction efficiency.

[0045] Example 2: Refer to Figures 1-7 A backfill structure for a wind farm foundation is basically the same as in Example 1. Further, a fixing plate 104 is fixedly connected to the main reinforcement 102, a first connecting ear 105 is fixedly connected to the fixing plate 104, and a second connecting ear 201 corresponding to the first connecting ear 105 is fixedly connected to the arc plate 2.

[0046] The second connecting ear 201 is connected to the first connecting ear 105 by external bolts to fix the arc plate 2, which makes it easier to reduce the difficulty of construction.

[0047] When installing template 4, it is also fixed by installing template 4 onto the first connecting ear 105, which facilitates the construction of template 4 and improves its construction efficiency.

[0048] It also includes an embedded part 202 on one side of the arc plate 2, which is located inside the foundation pile 5.

[0049] By setting an embedded part 202 on the arc plate 2, the embedded part 202 of the arc plate 2 is embedded into the formed foundation pile 5, thereby further improving the stability of the connection between the arc plate 2 and the foundation pile 5, enhancing the auxiliary support capacity of the foundation pile 5, and thus effectively improving the bearing capacity and stability of the entire foundation structure.

[0050] Example 3: Reference Figures 1-7 A wind farm foundation backfill structure is basically the same as that in Embodiment 1, but further includes a positioning pipe 3 set in the first backfill layer 501. The positioning pipe 3 is provided with multiple sets of through holes 301 and the positioning pipe 3 is fixed by a second anchor rod 304.

[0051] The upper end of the positioning tube 3 is provided with a cover 303, and a cover plate 302 matching the through hole 301 is fixedly connected to the cover 303.

[0052] The positioning pipe 3 is installed in the first backfill layer 501 and fixed by the second anchor rod 304. The pre-embedded positioning pipe 3 facilitates high-pressure grouting during subsequent reinforcement.

[0053] The shielding plate 302 is used to seal the through hole 301. When the later reinforcement is carried out, the grout is directly injected into the positioning pipe 3 under high pressure. At this time, the grout overflows from multiple through holes 301 to fill the empty area inside. At the same time, after contacting the first backfill layer 501, it forms a whole, which can improve the support capacity of the foundation pile 5 to a certain extent.

[0054] In practice, since the first backfill layer 501 is partially placed between the arc-shaped plates 2, after the subsequent filling and grouting, the reinforced first backfill layer 501 is embedded between two adjacent arc-shaped plates 2, thereby improving the integrity of the foundation pile 5 and the reinforced first backfill layer 501, and thus effectively improving the stability of the entire foundation structure.

[0055] An installation block 203 is detachably connected to the arc plate 2, and a fixing sleeve 204 corresponding to the positioning tube 3 is fixedly connected to the installation block 203.

[0056] The positioning tube 3 is installed by mounting block 203 and fixing sleeve 204. At this time, the positioning tube 3 can support the outer side of the arc plate 2, thereby improving the stability of the arc plate 2. In addition, with the cooperation of multiple second anchor rods 304, the stability of the entire foundation structure can be improved.

[0057] A second backfill layer 502 is provided on the upper side of the foundation pile 5 and on the upper side of the first backfill layer 501.

[0058] The second backfill layer 502 is first laid with small gravel, and then leveled with concrete. During maintenance and reinforcement work, the second backfill layer 502 can be appropriately removed.

[0059] Example 4: A construction method for the backfill structure of a wind farm foundation, mainly including the following steps:

[0060] Step 1: Level and clean the construction site to ensure good working conditions, then measure and lay out the lines to determine the installation position of foundation pile 5.

[0061] Step 2: Excavation. Excavate a foundation pit with a set diameter and a specified depth, level the bottom of the foundation pit, and lay concrete to form a flat working surface. Before laying the concrete, pre-embed the first anchor rod 101.

[0062] Step 3: Install the main reinforcement bar 102 onto the first anchor rod 101;

[0063] Step 4: Erect a ring-shaped plate on the outside of the multiple main reinforcement bars 102;

[0064] Step 5: Using the ring plate as the construction work surface, workers stand on the ring plate to carry out construction and erect steel bar groups between multiple main reinforcement bars 102;

[0065] Step 6: Install template 4 between the ring plates;

[0066] Step 7: Pour concrete into the area between multiple main reinforcement bars 102 to form a foundation pile 5, and then install the foundation base 503 onto the foundation pile 5 on top.

[0067] Step 8: Add sand and gravel between pile 5 and the foundation pit, and compact the sand and gravel.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A backfill structure for a wind farm pier foundation, comprising: The foundation pile (5) is characterized in that it further includes: A foundation ring (1) is provided on the underside of the foundation pile (5); Multiple first anchor bolts (101) are used to install and fix the foundation ring (1); The main reinforcement (102) is set on the first anchor rod (101), and the main reinforcement (102) is placed on the upper side of the foundation ring (1). The main reinforcement (102) is set inside the foundation pile (5). The reinforcing steel bars are installed inside the foundation pile (5); Multiple annular plates are disposed on the outside of multiple main reinforcing bars (102); The first backfill layer (501) is located outside the foundation pile (5), and the annular plate is placed inside the first backfill layer (501); A foundation base (503) is provided on top of the foundation pile (5); The annular plate includes multiple interlocking arc plates (2), and the arc plates (2) are detachably connected to the main rib (102); It also includes an embedded part (202) provided on one side of the arc plate (2), the embedded part (202) being located inside the foundation pile (5); It also includes a positioning tube (3) disposed in the first backfill layer (501), the positioning tube (3) being provided with multiple sets of through holes (301), and the positioning tube (3) being fixed by a second anchor rod (304); The arc plate (2) is detachably connected to an installation block (203), and the installation block (203) is fixedly connected to a fixing sleeve (204) corresponding to the positioning tube (3).

2. The backfill structure for a wind farm pier foundation according to claim 1, characterized in that, A positioning ring (103) is provided between the tops of the plurality of main reinforcing bars (102).

3. The backfill structure for a wind farm pier foundation according to claim 1, characterized in that, A fixing plate (104) is fixedly connected to the main rib (102), a first connecting ear (105) is fixedly connected to the fixing plate (104), and a second connecting ear (201) corresponding to the first connecting ear (105) is fixedly connected to the arc plate (2).

4. The backfill structure for a wind farm pier foundation according to claim 1, characterized in that, The upper end of the positioning tube (3) is provided with a cover (303), and a cover plate (302) matching the through hole (301) is fixedly connected to the cover (303).

5. The backfill structure for a wind farm pier foundation according to claim 1, characterized in that, A second backfill layer (502) is provided on the upper side of the foundation pile (5) and on the upper side of the first backfill layer (501).

6. A construction method for a backfill structure of a wind farm foundation, comprising the backfill structure of a wind farm foundation as described in claim 1, characterized in that, The main steps include: Step 1: Level and clean the construction site to ensure good working conditions, and then measure and lay out the lines to determine the installation position of the foundation pile (5); Step 2: Excavation. Excavate a foundation pit with a set diameter and a specified depth, level the bottom of the foundation pit, and lay concrete to form a flat working surface. Before laying the concrete, pre-embed the first anchor rod (101). Step 3: Install the main reinforcement (102) onto the first anchor rod (101); Step 4: Erect a ring-shaped plate on the outside of multiple main reinforcement bars (102); Step 5: Using the ring plate as the construction work surface, the workers stand on the ring plate to carry out construction and erect steel bar groups between multiple main bars (102); Step 6: Install the template (4) between the ring plates; Step 7: Pour concrete into the area between multiple main reinforcement bars (102) to form a foundation pile (5), and then install the foundation base (503) on the top of the foundation pile (5); Step 8: Add sand and gravel between the foundation pile (5) and the foundation pit, and compact the sand and gravel.

Images