Adjustable foundation for draught fan and construction and adjustment method of adjustable foundation

Abstract

According to the adjustable foundation for the draught fan and the construction and adjustment method of the adjustable foundation, a cushion layer is arranged on a foundation ring beam, a circular raft plate is arranged on the cushion layer, a ring beam and a connecting beam are arranged on the circular raft plate, through jacking channels are formed in the positions, located at the joints of the ring beam and the connecting beam, of the circular raft plate, and embedded steel bars are arranged on the outer sides of the jacking channels; stand columns and jacks are placed in the jacking channels, the bottoms of the stand columns are supported on the foundation ring beam, and a top plate is jacked at the upper ends of the jacks and fixed through downward pulling of embedded steel bars. The construction method comprises the steps of foundation ring beam construction, cushion layer construction and circular raft plate construction. During adjustment, the circular raft plate is jacked up through the jack, and grouting fixation is carried out below the circular raft plate. When the draught fan foundation inclines, the circular raft can be adjusted to be horizontal, a draught fan is made to be at a normal angle, and safe and normal operation of the draught fan is guaranteed; the construction method is feasible, and the adjustment method is simple and reliable.

Description

Technical Field

[0001] The present invention relates to an adjustable foundation for a fan and a construction adjustment method thereof, which are used to cope with differential settlement deformation of the foundation and keep the fan foundation level. Background Art

[0002] In recent years, onshore wind power in China has developed rapidly. However, a large amount of land is required for the installation of fans. Therefore, goaf areas and high-filled areas of mine waste have become ideal sites for fan installation. Due to the poor foundation stability of goaf areas and high-filled areas of mine waste, the foundations built thereon are prone to settlement deformation. If the settlement deformation exceeds the deformation control requirements of the fan foundation, accidents such as abnormal operation of the generator set and structural overturning may occur. Therefore, it is necessary to design and construct an adjustable foundation to solve the problems caused by foundation settlement deformation and ensure the safety and normal operation of the fan. Summary of the Invention

[0003] The purpose of the present invention is to provide an adjustable foundation for a fan and a construction adjustment method thereof, so as to solve the adjustment problem after the settlement deformation of the fan foundation.

[0004] The purpose of the present invention is achieved in the following way: An adjustable foundation for a fan includes a foundation ring beam. The foundation ring beam is an annular body. A cushion layer is arranged on the foundation ring beam, and a circular raft plate is arranged on the cushion layer. Several ring beams with the same center and different diameters are arranged on the circular raft plate. Connecting beams in the radial direction of the ring beam are connected between the ring beams. The connecting beam connecting all the ring beams from the inside to the outside is a long connecting beam, and the long connecting beams are evenly distributed circumferentially; the connecting beam arranged between the outermost ring beam and its adjacent inner ring beam is a short connecting beam, and the short connecting beam is inserted between the adjacent long connecting beams. A through jacking channel is selectively arranged at each intersection of the ring beam and the connecting beam on the circular raft plate. A column is placed in the jacking channel, and a jack is placed on the column. The bottom of the column supports on the foundation ring beam. The upper end of the jack is provided with a top plate. 2-4 uniformly distributed anchor bars are installed on the outside of each jacking channel, and the top plate is pulled down by the anchor bars. The column, the anchor bars, the top plate and the jack form a jacking device.

[0005] The connection method between the anchor bar and the top plate is as follows: An external thread is arranged on the upper part of the anchor bar, and through holes corresponding to the respective anchor bars are provided on the top plate. After the top plate is placed downward from the upper part of the anchor bar, nuts are screwed on the external thread parts of the respective anchor bars passing through the through holes of the top plate to realize the connection between the anchor bar and the top plate.

[0006] A construction method for the adjustable foundation for a fan adopts the following steps: (1) Construction of the foundation ring beam: According to the site conditions, the foundation ring beam is arranged on a pile foundation, a natural foundation or a treated foundation. First, formwork is erected, and then a reinforced concrete structure is constructed in the formwork. It is necessary to ensure the accuracy and stability of the formwork to avoid deformation or leakage during concrete pouring; (2)Construction of cushion layer: Construct the cushion layer on the foundation ring beam. The cushion layer is a bitumen felt or sand-gravel cushion layer. (3)Construction of circular raft foundation: Construct the circular raft foundation on the cushion layer according to the design drawings of the fan, including the ring beam and connecting beam. During the construction process, reserve the jacking channels at the corresponding positions. (4)After each of the above parts reaches the setting period, the fan can be installed.

[0007] Adjustment method for the adjustable foundation of the fan: When the inclination of the fan reaches the warning value, prepare to carry out jacking. Insert the anchor bars outside the jacking channels, arrange the columns and jacks inside the jacking channels, place the top plate on the upper part of the jacks, and pull down the top plate through the anchor bars; Carry out jacking according to the inclination of the fan, jack up the circular raft foundation by jacking up the top plate through the jacks and pulling through the anchor bars, monitor the inclination of the fan while jacking, after jacking to the predetermined position, grout and fix under the circular raft foundation, and then the top plate can be opened and the jacks can be removed.

[0008] When the fan inclines due to the foundation in the present invention, the circular raft foundation can be adjusted to be horizontal through the jacks, and grout and fix under the circular raft foundation, so that the fan is in a normal angle, ensuring the safety and normal operation of the fan; The construction method is practical and feasible, and the adjustment method is simple and reliable. Description of the drawings

[0009] Figure 1 is the front view of the present invention; Figure 2 is the bottom view of the present invention; Figure 3 is the top view of the present invention; Figure 4 is the structural diagram of the jacking part.

[0010] In the figure: 1 - Foundation ring beam; 2 - Cushion layer; 3 - Circular raft foundation; 31 - Ring beam; 32 - Connecting beam; 4 - Jacking device; 40 - Jacking channel; 41 - Column; 42 - Anchor bar; 43 - Top plate; 44 - Jack. Detailed implementation manners

[0011] Refer to Figures 1 - 3, An adjustable foundation for a fan, comprising a foundation ring beam 1. The foundation ring beam 1 is an annular body. A cushion layer 2 is provided on the foundation ring beam 1. A circular raft plate 3 is arranged on the cushion layer 2. Several ring beams 31 with the same center and different diameters are provided on the circular raft plate 3. Connecting beams 32 in the radial direction of the ring beams 31 are connected between the ring beams 31. The connecting beams 32 connecting all the ring beams 31 from the inside to the outside are long connecting beams, and the long connecting beams are evenly distributed circumferentially; the connecting beams 32 provided between the outermost ring beam 31 and the adjacent inner ring beam 31 are short connecting beams, and the short connecting beams are inserted between the adjacent long connecting beams. Through holes 40 are selectively provided at each intersection of the ring beams 31 and the connecting beams 32 on the circular raft plate 3. Columns 41 are placed in the through holes 40. Jacks 44 are placed on the columns 41. The bottom of the columns 41 is supported on the foundation ring beam 1. The upper end of the jack 44 is provided with a top plate 43. 2-4 evenly distributed anchor bars 42 are installed on the outside of each through hole 40. The top plate 43 is pulled down by the anchor bars 42. The column 41, the anchor bar 42, the top plate 43 and the jack 44 form a jacking device 4.

[0012] External threads are provided on the upper part of the anchor bar 42. Through holes corresponding to the respective anchor bars 42 are provided on the top plate 43. After the top plate 43 is placed downward from the upper part of the anchor bar 42, nuts are screwed on the external thread parts of the respective anchor bars 42 passing through the through holes of the top plate 43, so that the anchor bars 42 function as tie rods.

[0013] The construction method of the adjustable foundation for a fan adopts the following steps: (1) Construction of the foundation ring beam 1: According to the site conditions, the foundation ring beam 1 is arranged on a pile foundation, a natural foundation or a treated foundation. First, formwork is erected, and then a reinforced concrete structure is constructed inside the formwork. It is necessary to ensure the accuracy and stability of the formwork to avoid deformation or leakage during concrete pouring; (2) Construction of the cushion layer 2: The cushion layer 2 is constructed on the foundation ring beam 1. The cushion layer 2 is an asphalt felt or sand and gravel cushion layer. The main function of the cushion layer 2 is to isolate the foundation ring beam 1 from the circular raft plate 3 and provide conditions for the jacking of the later fan foundation; (3) Construction of the circular raft plate 3: The circular raft plate 3 is constructed on the cushion layer 2 according to the fan design drawings, including the ring beam 31 and the connecting beam 32. During the construction process, through holes 40 should be reserved at the corresponding positions; (4) After each of the above parts meets the setting period, the fan can be installed.

[0014] The adjustment method of the adjustable foundation for a fan is as follows: Columns 41 and jacks 44 are arranged in the through holes. The top plate 43 is supported by the anchor bars 42; jacking is carried out according to the inclination of the fan. The circular raft plate 3 is lifted by the jack 44. The inclination of the fan is monitored during jacking. After jacking to the predetermined position, grouting is carried out and fixed under the circular raft plate 3.

[0015] When the inclination of the fan reaches the warning value, prepare for jacking. Insert anchor bars 42 outside the jacking channel, arrange columns 41 and jacks 44 in the jacking channel 40, place a top plate 43 on the upper part of the jack 44, and pull down the top plate 43 through the anchor bars 42; jack according to the inclination of the fan, jack up the top plate 43 through the jack 44 and pull the circular raft 3 up through the anchor bars 42. Monitor the inclination of the fan while jacking. After jacking to the predetermined position, grout and fix under the circular raft 3, then the top plate 43 can be opened and the jack 44 can be removed.

Claims

1. An adjustable foundation for a fan, comprising a foundation ring beam, the foundation ring beam being an annular body, characterized in that: A cushion layer (2) is provided on the foundation ring beam (1), a circular raft plate (3) is arranged on the cushion layer (2), several ring beams (31) with the same center and different diameters are provided on the circular raft plate (3), connecting beams (32) in the radial direction of the ring beams (31) are connected between the ring beams (31), the connecting beams (32) connecting all the ring beams (31) from the inside to the outside are long connecting beams, and the long connecting beams are evenly distributed circumferentially; the connecting beams (32) provided between the outermost ring beam (31) and the adjacent inner ring beam (31) are short connecting beams, and the short connecting beams are inserted between the adjacent long connecting beams. Through holes (40) are selectively provided at the joints of the ring beams (31) and the connecting beams (32) on the circular raft plate (3). Columns (41) are placed in the through holes (40), jacks (44) are placed on the columns (41), the bottoms of the columns (41) are supported on the foundation ring beam (1), a top plate (43) is provided at the upper end of the jack (44), and 2-4 evenly distributed rebar dowels (42) are installed on the outside of each through hole (40). The top plate (43) is pulled down by the rebar dowels (42), and the columns (41), the rebar dowels (42), the top plate (43) and the jacks (44) form a jacking device (4).

2. The adjustable foundation for a fan according to claim 1, wherein: External threads are provided at the upper parts of the rebar dowels (42), through holes corresponding to the rebar dowels (42) are provided on the top plate (43), and after the top plate (43) is placed downward from the upper parts of the rebar dowels (42), nuts are screwed on the external thread parts of the rebar dowels (42) passing through the through holes of the top plate (43).

3. A construction method of an adjustable foundation for a fan as claimed in claim 1 or 2, characterized in that The following steps are adopted: (1) Construction of the foundation ring beam: According to the site conditions, the foundation ring beam is arranged on a pile foundation, a natural foundation or a treated foundation. First, formwork is erected, and then a reinforced concrete structure is constructed inside the formwork. It is necessary to ensure the accuracy and stability of the formwork to avoid deformation or leakage during concrete pouring; (2) Construction of the cushion layer: The cushion layer is constructed on the foundation ring beam, and the cushion layer is a felt or sand-gravel cushion layer; (3) Construction of the circular raft plate: The circular raft plate, including the ring beam and the connecting beam, is constructed on the cushion layer according to the fan design drawings. During the construction process, through holes for jacking should be reserved at the corresponding positions; (4) After each of the above parts reaches the setting period, the fan can be installed.

4. An adjustment method for an adjustable foundation for a fan as described in claim 1 or 2, characterized in that: When the inclination of the fan reaches the warning value, jacking is ready to be implemented. Rebar dowels are implanted outside the through holes for jacking, columns and jacks are arranged in the through holes for jacking, a top plate is placed on the upper part of the jack, and the top plate is pulled down by the rebar dowels; jacking is carried out according to the inclination of the fan. The circular raft plate is jacked up by jacking the top plate upward by the jack and pulling by the rebar dowels. The inclination of the fan is monitored during jacking. After jacking to the predetermined position, grouting is carried out for fixation under the circular raft plate, and then the top plate can be opened and the jacks can be removed.

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