Wind power plant bearing platform foundation backfilling structure and construction method

Abstract

The invention discloses a wind power plant bearing platform foundation backfilling structure and a construction method, and belongs to the field of wind power plant construction foundations. A wind power plant bearing platform foundation backfilling structure comprises a foundation pile and further comprises a foundation ring arranged on the lower side of the foundation pile. The first anchor rods are used for installing and fixing the foundation ring; the main reinforcements are arranged on the first anchor rods, the main reinforcements are arranged on the upper side of the foundation ring, and the main reinforcements are arranged in the foundation pile; the steel bar group is arranged in the foundation pile; the situation that the stress of the foundation pile is affected by shaking or bending of the main reinforcement in the construction process is prevented, meanwhile, a worker can step on the arc-shaped plates for construction, a construction frame does not need to be erected around, the construction efficiency can be improved to a certain degree, the stress face of the outer side of the foundation pile can be increased through the arc-shaped plates, and the construction efficiency is improved. The bearing capacity and stability of the whole foundation structure are effectively improved, and later reinforcement treatment is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of wind farm construction foundations, and in particular to a wind farm cap foundation backfill structure and a construction method. Background Art

[0002] In the current wind farm construction projects, the pedestal foundation is a key structure supporting wind power generation equipment. Its performance is directly related to the operating stability and safety of the entire wind farm. The pedestal foundation is mainly divided into extended foundation, pile foundation and rock anchor foundation. The pile foundation uses a long pile as the foundation. The pedestal foundation backfill structure mainly includes the pedestal foundation and the backfill layer.

[0003] The current pedestal foundation backfill structure generally requires digging a foundation pit of a certain depth and diameter for the convenience of construction, and setting up a scaffolding to lay the steel bar group in the foundation pile, which may increase the workload to a certain extent and affect the construction progress. The foundation pile is then poured and formed, and finally backfilled with fillers on all sides. The foundation pile mainly relies on its own gravity and its own outer wall to provide a certain support capacity. Simply relying on gravity and outer wall support, it is necessary to increase its gravity and diameter to support larger wind farm units, which may increase its construction volume and affect its construction efficiency. Summary of the invention

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

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A wind farm cap foundation backfill structure comprises: foundation piles, and also comprises: a foundation ring, which is arranged on the lower side of the foundation piles; a plurality of first anchor rods, which are used to install and fix the foundation rings; main reinforcements, which are arranged on the first anchor rods, and the main reinforcements are placed on the upper side of the foundation rings, and the main reinforcements are arranged in the foundation piles; a steel bar group, which is arranged in the foundation piles; a plurality of annular plates, which are arranged on the outside of the plurality of main reinforcements; a first backfill layer, which is arranged on the outside of the foundation piles, and the annular plates are placed in the first backfill layer; and a foundation seat, which is arranged on the top of the foundation piles.

[0007] In order to improve the stability of the main reinforcement, further, a positioning ring is provided between the tops of the plurality of main reinforcements.

[0008] In order to facilitate on-site assembly, the annular plate further comprises a plurality of arc-shaped plates combined with each other, and the arc-shaped plates are detachably connected to the main ribs.

[0009] In order to facilitate the installation of the arc-shaped 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 arc-shaped plate.

[0010] In order to improve the stability of the curved plate and the integrity of the curved plate and the foundation piles, further, an embedded portion is provided on one side of the curved plate, and the embedded portion is located in the foundation piles.

[0011] In order to facilitate the reinforcement grouting at a later stage, it further includes a positioning tube arranged in the first backfill layer, the positioning tube is provided with a plurality of groups of through holes, and the positioning tube is fixed by a second anchor rod.

[0012] In order to facilitate shielding of the through hole, further, a shielding cover is provided at the upper end of the positioning tube, and a shielding sheet matching the through hole is fixedly connected to the shielding cover.

[0013] In order to increase the integrity of the arc plate and the positioning tube, further, the arc plate is detachably connected with a mounting block, and the mounting block is fixedly connected with a fixing sleeve corresponding to the positioning tube.

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

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

[0016] Step 1: Level and clean the construction site to ensure that the construction site has good working conditions, then measure and lay out the lines to determine the installation position of the foundation piles;

[0017] Step 2: excavate and set a foundation pit of 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 concrete, pre-embed the first anchor rod in advance;

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

[0019] Step 4: Build annular plates on the outside of multiple main reinforcements;

[0020] Step 5: Using the annular plate as a construction working surface, workers stand on the annular plate to carry out construction and set up steel bar groups between multiple main bars;

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

[0022] Step 7: Pour concrete into the area between the main bars to form foundation piles, and then install the foundation seat on the foundation piles at the top;

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

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

[0025] 1. The wind farm foundation backfill structure is formed by combining multiple arc plates to form multiple annular plates. The arc plates are installed on the main reinforcement. The main reinforcement can be limited in multiple directions through multiple annular plates to prevent the main reinforcement from shaking or bending during construction and affecting the stress of the foundation piles. At the same time, multiple arc plates can be provided for workers to step on for construction, so there is no need to set up construction frames around them. When opening the foundation pit, a smaller foundation pit can be opened, which can improve the construction efficiency to a certain extent. Multiple arc plates can increase the stress surface on the outside of the foundation pile. The upper and lower sides of the arc plates can be used as stress surfaces, thereby effectively improving the stability of the foundation piles. To a certain extent, the construction height and diameter of the foundation piles can be reduced, thereby reducing the construction difficulty and improving the construction efficiency.

[0026] 2. The wind farm pedestal foundation backfill structure achieves a fixing effect by installing the template on the first connecting ear during installation of the template, thereby facilitating the construction of the template and improving its construction efficiency. An embedded portion is provided on the arc plate, and the embedded portion of the arc plate is embedded in the formed foundation pile, thereby further improving the stability of the connection between the arc plate and the foundation pile, enhancing the auxiliary support capacity for the foundation pile, and thus effectively improving the bearing capacity and stability of the entire foundation structure.

[0027] 3. The wind farm pedestal foundation backfill structure is directly reinforced by high-pressure grouting into the positioning tube. At this time, the slurry overflows from multiple through holes to fill the empty area inside. At the same time, after contacting with the first backfill layer, it forms a whole, thereby improving the supporting capacity of the foundation piles to a certain extent. In the specific implementation, since the first backfill layer is partially placed between the arc plates, after the later filling and grouting, the reinforced first backfill layer is embedded between the two adjacent arc plates, thereby improving the integrity of the foundation piles and the reinforced first backfill layer, thereby effectively improving the stability of the entire foundation structure.

[0028] The parts not involved in the device are the same as the existing technology or can be implemented by the existing technology. The present invention prevents the main reinforcement from shaking or bending during the construction process to affect the stress of the foundation piles. At the same time, multiple curved plates can be provided for workers to step on for construction, and there is no need to set up construction frames around them. To a certain extent, the construction efficiency can be improved. Multiple curved plates can increase the stress surface on the outside of the foundation piles, effectively improving the bearing capacity and stability of the entire foundation structure, and facilitating later reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A cross-sectional schematic diagram of a backfill state of a wind farm foundation backfill structure proposed by the present invention;

[0030] Figure 2 A schematic diagram of a wind farm foundation backfill structure proposed by the present invention Figure 1 ;

[0031] Figure 3 A schematic diagram of a wind farm foundation backfill structure proposed by the present invention Figure 2 ;

[0032] Figure 4 A cross-sectional schematic diagram of a wind farm cap foundation backfill structure proposed by the present invention;

[0033] Figure 5 A schematic diagram of the expanded structure of a wind farm foundation backfill structure proposed by the present invention Figure 1 ;

[0034] Figure 6 A schematic diagram of the expanded structure of a wind farm foundation backfill structure proposed by the present invention Figure 2 ;

[0035] Figure 7 A wind farm foundation backfill structure proposed by the present invention Figure 6 A magnified schematic diagram of center A.

[0036] In the figure: 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. shielding sheet; 303. shielding cover; 304. second anchor rod; 4. formwork; 5. foundation pile; 501. first backfill layer; 502. second backfill layer; 503. foundation seat. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] Example 1: Reference Figure 1-Figure 7A wind farm foundation backfill structure includes: a foundation pile 5, and also includes: a foundation ring 1, which is arranged on the lower side of the foundation pile 5; a plurality of first anchor rods 101, which are used to install and fix the foundation ring 1; a main reinforcement 102, which is arranged on the first anchor rod 101, and the main reinforcement 102 is placed on the upper side of the foundation ring 1, and the main reinforcement 102 is arranged in the foundation pile 5; a steel bar group, which is arranged in the foundation pile 5; a plurality of annular plates, which are arranged on the outside of the plurality of main reinforcements 102; a first backfill layer 501, which is arranged on the outside of the foundation pile 5, and the annular plates are placed in the first backfill layer 501; a foundation seat 503, which is arranged on the top of the foundation pile 5.

[0039] A positioning ring 103 is provided between the tops of the plurality of main ribs 102 .

[0040] The annular plate includes a plurality of arc-shaped plates 2 combined with each other, and the arc-shaped plates 2 are detachably connected to the main ribs 102 .

[0041] When constructing the foundation of the wind farm, the construction site is leveled and cleaned to ensure that the construction site has good working conditions, and then measurement and layout are carried out to determine the installation position of the foundation pile 5. A foundation pit of a set diameter and a specified depth is dug by an excavator or a drill, and concrete is laid at the bottom of the foundation pit to form a flat working surface. Before laying concrete, the first anchor rod 101 is pre-buried, the main reinforcement 102 is installed on the first anchor rod 101, and an annular plate composed of multiple arc plates 2 is set up on the outside of multiple main reinforcements 102.

[0042] The annular plate is used as a construction working surface, and workers stand on the annular plate to carry out construction, set up steel bar groups between multiple main bars 102, install the formwork 4 between the annular plates, pour concrete into the area between the multiple main bars 102 to form foundation piles 5, and then install the foundation seat 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] A plurality of annular plates are formed by combining a plurality of arc plates 2, and the arc plates 2 are installed on the main reinforcement 102. The main reinforcement 102 can be limited in multiple directions by the plurality of annular plates to prevent the main reinforcement 102 from shaking or bending during the construction process and affecting the stress of the foundation pile 5. At the same time, a plurality of arc plates 2 can be provided for workers to step on for construction, so that there is no need to set up construction frames around them. 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 process of the foundation pile 5 being subjected to stress, the stress-bearing surface on the outer side of the foundation pile 5 can be enlarged by using a plurality of arc plates 2, and both the upper and lower sides of the arc plates 2 can be used as stress-bearing surfaces, thereby effectively improving the stability of the foundation pile 5 and reducing the construction height and diameter of the foundation pile 5 to a certain extent, thereby reducing the construction difficulty and improving the construction efficiency.

[0045] Example 2: Reference Figure 1-Figure 7 A wind farm foundation backfill structure is basically the same as 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 complete the fixation of the arc plate 2, thereby reducing the difficulty of its construction.

[0047] When the template 4 is installed, the template 4 is also fixed to the first connecting ear 105 to facilitate the construction of the template 4 and improve its construction efficiency.

[0048] The arc-shaped plate 2 is also provided with an embedded portion 202 on one side thereof, and the embedded portion 202 is located inside the foundation pile 5 .

[0049] By providing an embedded portion 202 on the curved plate 2, the embedded portion 202 of the curved plate 2 is embedded in the formed foundation pile 5, thereby further improving the stability of the connection between the curved plate 2 and the foundation pile 5, enhancing the auxiliary support capacity for the foundation pile 5, and thus effectively improving the bearing capacity and stability of the entire foundation structure.

[0050] Example 3: Reference Figure 1-Figure 7 A wind farm pedestal foundation backfill structure is basically the same as Example 1, and further includes a positioning tube 3 arranged in the first backfill layer 501, and a plurality of through holes 301 are arranged on the positioning tube 3, and the positioning tube 3 is fixed by a second anchor rod 304.

[0051] A shielding cover 303 is provided at the upper end of the positioning tube 3 , and a shielding sheet 302 matching the through hole 301 is fixedly connected to the shielding cover 303 .

[0052] The positioning tube 3 is arranged in the first backfill layer 501 and fixed by the second anchor rod 304. By pre-burying the positioning tube 3, it is convenient to perform high-pressure grouting operation on it during the later reinforcement.

[0053] The shielding piece 302 is used to seal the through hole 301. When performing subsequent reinforcement, high-pressure grouting is directly performed into the positioning tube 3. At this time, the slurry overflows from the multiple through holes 301 to fill the empty area inside. At the same time, after contacting with the first backfill layer 501, it forms a whole, thereby improving the supporting capacity of the foundation pile 5 to a certain extent.

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

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

[0056] The positioning tube 3 is installed through the mounting block 203 and the 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, and cooperate with multiple second anchor rods 304 to improve the stability of the entire basic structure.

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

[0058] The second backfill layer 502 is first paved with small gravel and then leveled with concrete. When performing maintenance and reinforcement operations, the second backfill layer 502 can be appropriately removed.

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

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

[0061] Step 2: 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 concrete, pre-embed the first anchor rod 101;

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

[0063] Step 4: construct an annular plate outside the plurality of main reinforcements 102;

[0064] Step 5: Using the annular plate as a construction working surface, workers stand on the annular plate to perform construction and set up steel bar groups between the multiple main bars 102;

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

[0066] Step 7: pour concrete into the area between the main bars 102 to form a foundation pile 5, and then install the base 503 on the top of the foundation pile 5;

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

[0068] 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 wind farm foundation backfill structure, comprising: The foundation pile (5) is characterized by further comprising: A foundation ring (1) is arranged on the lower side of the foundation pile (5); A plurality of first anchor rods (101) for installing and fixing the base ring (1); A main reinforcement (102) is arranged on the first anchor rod (101), and the main reinforcement (102) is placed on the upper side of the foundation ring (1), and the main reinforcement (102) is arranged inside the foundation pile (5); A steel bar group, arranged in the foundation pile (5); A plurality of annular plates, arranged on the outside of the plurality of main ribs (102); A first backfill layer (501) is arranged outside the foundation pile (5), and the annular plate is placed inside the first backfill layer (501); The foundation seat (503) is arranged on the top of the foundation pile (5).

2. A wind farm cap foundation backfill structure according to claim 1, characterized in that: A positioning ring (103) is provided between the tops of the plurality of main ribs (102).

3. A wind farm cap foundation backfill structure according to claim 1, characterized in that: The annular plate comprises a plurality of mutually combined arc-shaped plates (2), and the arc-shaped plates (2) are detachably connected to the main ribs (102).

4. A wind farm cap foundation backfill structure according to claim 3, 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).

5. A wind farm cap foundation backfill structure according to claim 3, characterized in that: It also includes an embedded portion (202) provided on one side of the arc-shaped plate (2), wherein the embedded portion (202) is located inside the foundation pile (5).

6. A wind farm cap foundation backfill structure according to claim 3, characterized in that: It also comprises a positioning tube (3) arranged in the first backfill layer (501), the positioning tube (3) being provided with a plurality of groups of through holes (301), and the positioning tube (3) being fixed by a second anchor rod (304).

7. A wind farm cap foundation backfill structure according to claim 6, characterized in that: A shielding cover (303) is provided at the upper end of the positioning tube (3), and a shielding sheet (302) matching the through hole (301) is fixedly connected to the shielding cover (303).

8. A wind farm cap foundation backfill structure according to claim 6, characterized in that: The arc-shaped plate (2) is detachably connected to a mounting block (203), and the mounting block (203) is fixedly connected to a fixing sleeve (204) corresponding to the positioning tube (3).

9. The wind farm cap foundation backfill structure 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).

10. A construction method for a wind farm cap foundation backfill structure, comprising the wind farm cap foundation backfill structure according to claim 1, characterized in that: The main steps include: Step 1: Level and clean the construction site to ensure that the construction site has good working conditions, then measure and lay out the lines to determine the installation position of the foundation pile (5); Step 2: excavate a foundation pit of 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 concrete, pre-embed the first anchor rod (101); Step 3: Install the main reinforcement (102) on the first anchor rod (101); Step 4: constructing an annular plate outside the plurality of main ribs (102); Step 5: Using the annular plate as a construction work surface, workers stand on the annular plate to carry out construction and set up steel bar groups between the plurality of main bars (102); Step 6: Install the template (4) between the annular plates; Step 7: pouring concrete into the area between the main bars (102) to form a foundation pile (5), and then installing the foundation seat (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.

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