Inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountainous area wind power foundation and its construction method

Abstract

The present invention relates to the field of civil engineering and wind power generation technology. The inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountain wind power foundation includes a circular foundation pit, the rock-soil body in the middle of the foundation pit is excavated to the bottom elevation of the foundation top plate, and prefabricated reinforced concrete arc plates that can be assembled are arranged in layers along the outer wall of the rock-soil body in the middle of the foundation pit, and finally assembled to the bottom elevation of the foundation top plate. The space between the side wall of the foundation pit and the outer wall of the prefabricated reinforced concrete arc plate is backfilled in layers with crushed stone soil excavated from the foundation pit, and the filling surface is leveled. After the backfilling is completed, steel bars are laid on the backfilled crushed stone soil, the prefabricated reinforced concrete arc plate and the top surface of the central soil body, and the concrete top plate is poured. A wind power tower barrel is arranged in the center of the reinforced concrete top plate, and the top plate and the tower barrel are connected by vertical anchoring steel bars and high-strength bolts. The present invention retains the original rock-soil body in the middle, gives full play to the role of the middle soil, saves the construction time on site, and the prefabricated components are easy to transport, and the cost of the foundation is reduced.

Description

Technical Field

[0001] The invention relates to foundation forms in the fields of civil engineering and wind power generation, and in particular to an inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated wind power foundation in a mountainous area. Background Art

[0002] Wind energy is a clean and renewable energy source. Using wind energy to generate electricity has the advantages of zero pollution, zero emissions, and continuous power generation. The development of wind power generation is highly valued in my country.

[0003] Most wind power projects are built on land, mainly in mountainous areas of the Gobi Desert. Land-based wind power towers are relatively high, so large foundations are required to ensure the stability of the upper structure. At present, most wind power tower foundations in mountainous areas use gravity foundations and rock anchor foundations, but gravity foundations use a large amount of steel bars and concrete; excavation of foundation pits produces a large amount of gravel and soil that cannot be processed, causing pollution to the mountain environment. A large number of prestressed anchors are required during the construction of rock anchor foundations, which has a high project cost, and the failure of the anchors will have a huge adverse effect on the stability of the upper structure. Summary of the invention

[0004] In order to overcome the shortcomings of current mountain wind power foundations, improve the bearing capacity and stability of the foundation, speed up the construction progress and reduce the project cost, the present invention proposes an inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountain wind power foundation suitable for high-bearing capacity rock foundations in mountainous areas and a construction method thereof.

[0005] The technical solution adopted by the present invention is:

[0006] The inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountain wind power foundation includes a circular foundation pit. The rock and soil in the middle of the foundation pit is excavated to the bottom elevation of the foundation top plate, and prefabricated reinforced concrete arc plates that can be assembled are arranged in layers along the outer wall of the rock and soil in the middle of the foundation pit, and finally assembled to the bottom elevation of the foundation top plate. At this time, the soil in the middle of the foundation pit is completely wrapped by the prefabricated reinforced concrete arc plate. Then, the space between the side wall of the foundation pit and the outer wall of the prefabricated reinforced concrete arc plate is backfilled in layers with crushed stone soil excavated from the foundation pit, and the fill surface is leveled. After the backfilling is completed, steel bars are laid on the backfilled crushed stone soil, prefabricated reinforced concrete arc plate and the top surface of the central soil body, and the concrete top plate is poured. A wind turbine tower barrel is set in the center of the reinforced concrete top plate, and the top plate and the tower barrel are connected by vertical anchor steel bars and high-strength bolts.

[0007] The prefabricated reinforced concrete arc-shaped plates are connected by mortise and tenon joints and bolts.

[0008] The upper side and left side of the prefabricated reinforced concrete arc-shaped plate are provided with tenons, and the right side is provided with tenon grooves.

[0009] The upper side and left side of the non-bottom prefabricated reinforced concrete arc-shaped plate are provided with tenons, and the lower side and left side are provided with tenon grooves.

[0010] The thickness of the prefabricated reinforced concrete curved plate is 300-800 mm.

[0011] The diameter of the top plate is the same as the outer diameter of the annular foundation pit.

[0012] The thickness of the top plate is 0.1 to 0.2 times the depth of the foundation pit.

[0013] The advantages of the present invention are:

[0014] 1. The original rock and soil in the middle is retained, making it a part of the foundation, jointly bearing the load transmitted by the tower, giving full play to the role of the middle soil, reducing the excavation and waste of gravel soil, saving resources and protecting the environment.

[0015] 2. The present invention is a prefabricated component assembled foundation, which saves on-site construction time and significantly improves the construction speed.

[0016] 3. The amount of reinforced concrete required on site is reduced, and prefabricated components are easy to transport, reducing transportation costs.

[0017] 4. The present invention avoids the use of high-strength bolts and anchor rods, reduces the amount of concrete used, and greatly reduces the cost of the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of a basic implementation of the present invention.

[0019] Figure 2 It is a detail drawing of precast reinforced concrete curved slab.

[0020] In the figure: 1-prefabricated reinforced concrete curved slab, 2-backfill soil, 3-middle soil, 4-plain concrete cushion, 5-top plate, 6-wind turbine tower, 7-tenon, 8-tenon groove. DETAILED DESCRIPTION

[0021] A construction method of an inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountain wind power foundation is as follows:

[0022] (1) Excavate a circular foundation pit, and slope the side walls of the foundation pit according to the construction requirements; the width of the foundation pit ring is generally 2 to 3 times the thickness of the precast slab; the crushed stone soil excavated from the foundation pit is piled around the foundation pit for future use.

[0023] (2) Lay and splice the first layer of prefabricated reinforced concrete curved slabs at the bottom of the foundation pit.

[0024] (3) After the first layer of prefabricated reinforced concrete curved slabs are spliced, the gravel soil excavated from the foundation pit is backfilled between the first layer of prefabricated reinforced concrete curved slabs and the side walls of the foundation pit. The backfill height is less than the height of the first layer of prefabricated reinforced concrete curved slabs laid, and the backfill gravel soil is compacted to make the compaction coefficient greater than 0.95.

[0025] (4) Repeat steps (2) and (3) until all precast reinforced concrete curved slabs are laid and the final height of the backfilled gravel soil is the same as that of the precast reinforced concrete curved slabs.

[0026] (5) After the gravel soil is backfilled, the gravel soil is reinforced by cement grouting.

[0027] (6) Pour a plain concrete cushion layer on the surface of the foundation pit, then lay steel bars, erect concrete formwork and pour the concrete top slab.

[0028] (7) The top plate formwork is removed and the prefabricated foundation construction is completed.

Claims

1. An inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountain wind power foundation, characterized in that: It includes a circular foundation pit, the rock and soil in the middle of the foundation pit is excavated to the bottom elevation of the foundation top plate, and prefabricated reinforced concrete arc plates that can be assembled are arranged in layers along the outer wall of the rock and soil in the middle of the foundation pit, and finally assembled to the bottom elevation of the foundation top plate. At this time, the soil in the middle of the foundation pit is completely wrapped by the prefabricated reinforced concrete arc plates, and the prefabricated reinforced concrete arc plates are connected by mortise and tenon joints and bolts; Then, the space between the side wall of the foundation pit and the outer wall of the prefabricated reinforced concrete curved plate is backfilled in layers with the gravel soil excavated from the foundation pit, and the fill surface is leveled; after the backfilling is completed, steel bars are laid on the backfilled gravel soil, the prefabricated reinforced concrete curved plate and the top surface of the central soil body, and the concrete top plate is poured; a wind turbine tower barrel is set in the center of the reinforced concrete top plate, and the top plate and the tower barrel are connected by vertical anchor steel bars and high-strength bolts; The construction method of an inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountainous area wind power foundation comprises the following steps: (1) Excavate a circular foundation pit, slope the side walls of the foundation pit according to the construction requirements, and pile the gravel and soil excavated from the foundation pit around the foundation pit for future use; (2) Laying and splicing the first layer of prefabricated reinforced concrete curved slabs at the bottom of the foundation pit; (3) After the first layer of prefabricated reinforced concrete curved slabs are spliced, the gravel soil excavated from the foundation pit is backfilled between the first layer of prefabricated reinforced concrete curved slabs and the side walls of the foundation pit. The height of the backfilled gravel soil is less than the height of the first layer of prefabricated reinforced concrete curved slabs laid, and the backfilled gravel soil is compacted to make the compaction coefficient greater than 0.95; (4) Repeat steps (2) and (3) until all prefabricated reinforced concrete curved slabs are laid and the final height of the backfilled gravel soil is the same as that of the prefabricated reinforced concrete curved slabs; (5) After the gravel soil is backfilled, cement grouting is performed to reinforce the gravel soil; (6) Pour a plain concrete cushion layer on the surface of the foundation pit, then lay steel bars, set up concrete formwork and pour concrete top slab. (7) The top plate formwork is removed and the prefabricated foundation construction is completed.

2. The inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountain wind power foundation according to claim 1 is characterized in that: The thickness of the prefabricated reinforced concrete curved slab is 300 to 800 mm.

3. The inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountain wind power foundation according to claim 1 is characterized in that: The diameter of the top plate is the same as the outer diameter of the annular foundation pit.

4. The inverted barrel-shaped prefabricated reinforced concrete-rock-soil integrated mountain wind power foundation according to claim 1 is characterized in that: The thickness of the top plate is 0.1 to 0.2 times the depth of the foundation pit.

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