Settlement prevention and control device for high-low leg iron tower foundation and construction method of settlement prevention and control device

Abstract

The invention relates to a settlement prevention and control device for a high-low leg iron tower foundation and a construction method thereof, the settlement prevention and control device comprises four foundation stand columns, two foundation stand columns located on the same side are first foundation stand columns, the other two foundation stand columns are second foundation stand columns, and the top ends of the second foundation stand columns are higher than the top ends of the first foundation stand columns. The bottom end of each foundation stand column is provided with a bearing base, and the four foundation stand columns are jointly sleeved with a bearing net cage. X-shaped crossed anchor rod mechanisms are mounted between the two first foundation stand columns and between the two second foundation stand columns; supporting mechanisms are further installed between the first foundation stand column and the second foundation stand column which are located on the same side, each supporting mechanism comprises two vertical piles which are vertically and oppositely distributed, a connecting beam is installed between the top ends of the two vertical piles, and the two vertical piles are connected with the first foundation stand column and the second foundation stand column correspondingly. The stability of the high-low leg iron tower foundation can be improved, so that safe operation of a power transmission line is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of power transmission tower foundation reinforcement, and in particular relates to a settlement prevention and control device for a high-low leg tower foundation and a construction method thereof. Background Art

[0002] At present, in areas with complex terrain such as mountain slopes, the construction of transmission lines inevitably requires the use of high-low leg transmission towers to adapt to the undulating terrain and the irregularity of the line direction; and although this design can effectively overcome terrain obstacles, when entering the special geological environment of collapsible loess areas, the foundation stability of high-low leg transmission towers will face greater challenges.

[0003] Specifically, under the complex foundation conditions in collapsible loess areas, when the foundation meets water, the soil structure will undergo severe deformation, and the existing high-low leg tower foundations are sometimes prone to foundation settlement and structural instability during long-term loading, thereby threatening the safe operation of transmission lines. Therefore, there are still shortcomings and deficiencies in the existing technology. Summary of the invention

[0004] The purpose of the present invention is to provide a settlement prevention and control device for a high-low leg iron tower foundation and a construction method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is as follows: A settlement prevention and control device for a high-low leg iron tower foundation, comprising four foundation columns of equal length and distributed in a rectangular array, wherein the foundation columns are all arranged vertically, and two foundation columns located on the same side are first foundation columns, and the remaining two foundation columns are second foundation columns, wherein the top of the second foundation column is higher than the top of the first foundation column, a bearing base is installed at the bottom of each foundation column, and a horizontally distributed bearing mesh cage is commonly installed between the four foundation columns; An X-shaped cross anchor mechanism is installed between the two first foundation columns and between the two second foundation columns, and the cross anchor mechanism is located above the load-bearing mesh cage; a support mechanism is also installed between the first foundation column and the second foundation column located on the same side, and the support mechanism is located above the load-bearing mesh cage, and the support mechanism includes two vertically oppositely distributed piles, a connecting beam is installed between the top ends of the two piles, and the two piles are respectively connected to the first foundation column and the second foundation column.

[0006] Furthermore, the cross anchor mechanism includes two anchors, the middle positions of the two anchors are connected to form an X-shaped structure, and the two ends of each anchor are connected to the first foundation column and the second foundation column through a first connecting bolt.

[0007] Furthermore, the connection position of the two anchor rods is hinged, and a connecting seat is hinged to the end of each anchor rod. The connecting seat is connected to the first foundation column and the second foundation column through the first connecting bolt.

[0008] Furthermore, the top heights of the two vertical piles in each support mechanism are different.

[0009] Furthermore, the vertical pile is connected to the first foundation column and the second foundation column through the second connecting bolt.

[0010] Furthermore, the construction method of the settlement prevention device for the above high-low leg tower foundation includes the following steps: Step 1: Construction and pouring of the bearing base; Step 2: Construction and installation of the bearing cage and the foundation column; Step 3: Construction and installation of the support mechanism; Step 4: Construction and installation of the cross anchor rod mechanism.

[0011] Furthermore, in Step 1: The bearing base is a multi-layer stepped base. First step, positioning and setting out the lines; Second step, excavating the foundation pit of the bearing base by dividing the pits; Third step, sequentially laying the steel bar cages of the bearing base in layers in the foundation pit of the bearing base, and sequentially installing formworks on the steel bar cages, and pouring concrete in layers; Fourth step, reserving an installation opening for installing the foundation column on the top surface of the bearing base; Fifth step, removing the formwork and conducting acceptance inspection and testing of the bearing base.

[0012] Furthermore, in Step 2: First step, taking the positions of the four bearing bases as a reference, positioning and setting out the lines; Second step, excavating the foundation pit of the bearing cage; Third step, weaving the steel bar cages of the bearing cage and the four foundation columns; Fourth step, respectively passing the steel bar cages of the four foundation columns through the four corners of the bearing cage and then connecting them, and leaving gaps for installing formworks between the circumferences of the steel bar cages of the bearing cage and the foundation columns, and detecting the spatial position and elevation of the bearing cage; Fifth step, respectively inserting the steel bar cages of the foundation columns into the installation openings of the bearing base, and installing formworks on the steel bar cages of the foundation columns; Sixth step, pouring concrete; Seventh step, removing the formworks and conducting acceptance inspection and testing of the foundation columns.

[0013] Furthermore, in Step 3: First step, prefabricating and pouring the support mechanism, and reserving bolt installation through holes on the vertical piles; Second step, respectively placing the support mechanism between the first foundation column and the second foundation column, and using the second connecting bolt to connect the vertical pile with the first foundation column and the second foundation column respectively to complete the installation of the support mechanism.

[0014] Further, in Step 4: First, prefabricate the cross anchor rod mechanism, and reserve bolt installation through holes at the ends of the cross anchor rod mechanism; Second, place the cross anchor rod mechanisms between two first foundation columns and between two second foundation columns respectively; Third, use the first connecting bolts to connect the ends of the cross anchor rod mechanisms to the first foundation column and the second foundation column respectively, complete the installation of the cross anchor rod mechanism, and backfill the soil.

[0015] Adopting the above technical solution, the beneficial effects of the present invention are as follows: The four foundation columns of the present invention can form a high-low leg tower foundation. By setting the bearing base and the bearing cage to cooperate, a stable foundation platform can be formed between the four foundation columns. In this way, by improving the overall stiffness of the structure, the bearing capacity of the high-low leg tower foundation can be enhanced; Secondly, by setting the support mechanism, the first foundation column and the second foundation column can support each other, and by setting the cross anchor rod mechanism, the cooperation ability between the foundation columns can be enhanced to achieve multi-dimensional reinforcement of the foundation columns, thereby improving the stability, settlement resistance and service life of the high-low leg tower foundation to ensure the safe operation of the transmission line. Description of the Drawings

[0016] Figure 1 is one of the structural schematic diagrams of the present invention; Figure 2 is the second structural schematic diagram of the present invention; Figure 3 is the structural schematic diagram of a part of the present invention in the top view state; Figure 4 is one of the structural schematic diagrams of a part of the present invention; Figure 5 is the second structural schematic diagram of a part of the present invention; Figure 6 is the construction flow chart of the present invention.

[0017] Reference numerals: 1, bearing base; 2, bearing cage; 3, first foundation column; 4, second foundation column; 5, cross anchor rod mechanism; 51, anchor rod; 52, first connecting bolt; 6, support mechanism; 61, vertical pile; 62, connecting beam; 63, second connecting bolt; 7, tower. Detailed Embodiments

[0018] To make the purpose, technical solution and beneficial effects of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the drawings.

[0019] Such as Figures 1 to 5As shown, the present invention provides a settlement prevention and control device for the foundation of a high-low leg iron tower, comprising four foundation columns of equal length and distributed in a rectangular array, the foundation columns are all vertically arranged, and the two foundation columns located on the same side are the first foundation columns 3, and the other two foundation columns are the second foundation columns 4, the top of the second foundation column 4 is higher than the top of the first foundation column 3, and the four foundation columns can form a high-low leg iron tower foundation, which can support the iron tower 7 when in use; a bearing base 1 is installed at the bottom end of each foundation column, and the bearing base 1 is laid horizontally; and a horizontally distributed bearing mesh cage 2 is commonly mounted between the four foundation columns, specifically, the bearing base 1 cooperates with the bearing mesh cage 2 to form a stable foundation platform between the four foundation columns, so that the bearing capacity of the high-low leg iron tower foundation can be enhanced by improving the overall rigidity of the structure.

[0020] Secondly, an X-shaped cross anchor mechanism 5 is installed between the two first foundation columns 3 and between the two second foundation columns 4, and the cross anchor mechanism 5 is located above the load-bearing mesh cage 2; a support mechanism 6 is also installed between the first foundation column 3 and the second foundation column 4 located on the same side, and the support mechanism 6 is located above the load-bearing mesh cage 2, and the support mechanism 6 includes two vertically oppositely distributed piles 61, and a connecting beam 62 is installed between the top ends of the two piles 61, and the two piles 61 are respectively connected to the first foundation column 3 and the second foundation column 4. Specifically, by setting the support mechanism 6, the first foundation column 3 and the second foundation column 4 can support each other to ensure the coordinated stability of the structure; and by setting the cross anchor mechanism 5, the coordination ability between the foundation columns can be enhanced to achieve multi-dimensional reinforcement of the foundation columns, thereby improving the stability, anti-settlement deformation ability and service life of the high and low leg iron tower foundation to ensure the safe operation of the transmission line.

[0021] The specific configuration of the cross anchor mechanism 5 is as follows: Figure 2 and Figure 5 As shown, the cross anchor mechanism 5 includes two anchor rods 51, the middle positions of the two anchor rods 51 are connected to form an X-shaped structure, and the two ends of each anchor rod 51 are connected to the first foundation column 3 and the second foundation column 4 through a first connecting bolt 52. Specifically, a bolt installation through hole parallel to the axial direction of the anchor rod 51 is opened around the end of each anchor rod 51, and a threaded tube is embedded in the foundation column to connect the two ends of the anchor rod 51 with the foundation column through the first connecting bolt 52, so as to enhance the coordination ability between the foundation columns; in addition, a washer can be sleeved on the first connecting bolt 52 to improve the tightening force of the first connecting bolt 52; in addition, high-strength low-alloy steel, such as Q345 material, can be used to make the first connecting bolt 52 to improve the performance and service life of the first connecting bolt 52; secondly, the anchor rod 51 can be set as a prestressed anchor rod to improve the deformation resistance and pull-out resistance of the anchor rod 51.

[0022] Furthermore, the connection position of the two anchor rods 51 is a hinge joint, and a connection seat is hinged at the end of each anchor rod 51. The connection seat is connected to the first foundation column 3 and the second foundation column 4 through the first connecting bolts 52. Specifically, since the middle position of the two anchor rods 51 is a hinge joint, during use, according to the horizontal distance between the two foundation columns, the horizontal distance between the two ends of the cross-anchor mechanism 5 can be flexibly adjusted to facilitate the installation of the cross-anchor mechanism 5 between the two foundation columns. After adjustment, hinging the connection seat at the end of the anchor rod 51 does not affect connecting the two ends of the anchor rod 51 to the foundation columns through the first connecting bolts 52, that is, bolt installation through-holes for installing the first connecting bolts 52 are provided on the connection seat.

[0023] Furthermore, as Figure 1 shown in Figure 4 the figure, the top heights of the two vertical piles 61 in each group of support mechanisms 6 are different, so that the connecting beam 62 can be inclined, enabling the support mechanism 6 to form an inclined wedge-shaped support structure; the inclination angle of the connecting beam 62 can be designed according to the height difference between the first foundation column 3 and the second foundation column 4 to make the support mechanism 6 fit the distribution form of the first foundation column 3 and the second foundation column 4; in addition, the bottom heights of the two vertical piles 61 in each group of support mechanisms 6 can be the same, so that the circumferential shape of the support mechanism 6 forms a right trapezoidal structure to ensure the stability of the support mechanism 6 itself; in addition, an epoxy resin coating or similar material can be coated on the outer surface of the support mechanism 6 to perform anti-corrosion treatment on the support mechanism 6, which can enhance the durability and corrosion resistance of the support mechanism 6.

[0024] Furthermore, as Figure 1 shown in Figure 4 the figure, the vertical pile 61 is connected to the first foundation column 3 and the vertical pile 61 is connected to the second foundation column 4 through the second connecting bolts 63. Specifically, bolt installation through-holes are horizontally provided on both sides of the vertical pile 61, and threaded pipes are embedded in the foundation column to connect the vertical pile 61 to the foundation column through the second connecting bolts 63, which can enable the first foundation column 3 and the second foundation column 4 to support each other; in addition, washers can be sleeved on the second connecting bolts 63 to improve the fastening force of the second connecting bolts 63; in addition, high-strength low-alloy steel, such as Q345 material, can be selected to make the second connecting bolts 63 to improve the performance and service life of the second connecting bolts 63.

[0025] Furthermore, as Figure 6 shown in the figure, the construction method of the settlement prevention device for the above high-low leg tower foundation includes the following steps: Step 1: Construct and pour the bearing base 1; Step 2: Construction and installation of the bearing cage 2 and the foundation columns; Step 3: Construction and installation of the support mechanism 6; Step 4: Construction and installation of the cross anchor mechanism 5.

[0026] Further, in Step 1: The bearing base 1 is a multi-layer stepped base; First step, site cleaning to ensure the flatness and geometric accuracy of the foundation, and positioning and setting out according to the design drawings; Second step, excavating the foundation pit of the bearing base 1 according to the design requirements; Third step, sequentially placing the steel cage of the bearing base 1 in layers in the foundation pit of the bearing base 1, and sequentially installing formwork on the steel cage, pouring concrete in layers, and using mechanical vibration methods to ensure the density and homogeneity of the concrete. After the pouring is completed, carry out standard curing of the concrete; Fourth step, reserving an installation opening for installing the foundation columns on the top surface of the bearing base 1, and the installation opening can be adjusted according to the type of the foundation columns; Fifth step, after the concrete reaches the design strength, remove the formwork, and carry out acceptance tests on the dimensions, positions, and elevations of the bearing base 1 to form the bearing base 1 and make the bearing base 1 have a certain bearing capacity.

[0027] Further, in Step 2: First step, taking the positions of the four bearing bases 1 as a reference, positioning and setting out according to the design drawings; Second step, excavating the foundation pit of the bearing cage 2 according to the design requirements; Third step, using the steel cage weaving technology to weave the bearing cage 2 and four steel cages adapted to the shapes of the foundation columns; Fourth step, respectively passing the steel cages of the four foundation columns through the four corners of the bearing cage 2 and then connecting them, and leaving gaps for installing formwork between the circumferences of the bearing cage 2 and the steel cages of the foundation columns, and detecting the spatial position and elevation of the bearing cage 2 to achieve the precise connection between the bearing cage 2 and the four foundation columns; Fifth step, respectively inserting the steel cages of the foundation columns into the installation openings of the bearing base 1, and installing formwork on the steel cages of the foundation columns; Sixth step, pouring concrete, and after the pouring is completed, carrying out standard curing of the concrete; Seventh step, after the concrete reaches the design strength, removing the formwork, and carrying out acceptance tests on the dimensions, positions, and elevations of the foundation columns to form the bearing cage 2 and the foundation of the high-low leg iron tower; and after the concrete of the foundation columns is formed, the foundation columns can be firmly connected to the bearing base 1.

[0028] Further, in Step 3: First, precast and pour the support mechanism 6 according to the relative positions between the basic columns. The support mechanism 6 is also formed by a steel mesh cage and concrete pouring. Bolt installation through holes for installing the second connection bolts 63 are reserved on the vertical piles 61, and surface anti-corrosion treatment can be carried out on the support mechanism 6. Second, place the support mechanism 6 between the first basic column 3 and the second basic column 4 respectively, and use the second connection bolts 63 to connect the vertical piles 61 with the first basic column 3 and the second basic column 4 respectively to complete the installation of the support mechanism 6.

[0029] Further, in Step 4: First, precast the cross anchor rod mechanism 5 according to the relative positions between the basic columns, and bolt installation through holes for installing the first connection bolts 52 are reserved at the ends of the cross anchor rod mechanism 5. Second, place the cross anchor rod mechanism 5 between two first basic columns 3 and between two second basic columns 4 respectively. Third, use the first connection bolts 52 to connect the ends of the cross anchor rod mechanism 5 with the first basic column 3 and the second basic column 4 respectively to complete the installation of the cross anchor rod mechanism 5, and backfill the soil.

[0030] Further, the construction standard of the concrete pouring in the present invention conforms to the relevant regulations in the Code for Acceptance of Construction Quality of Concrete Structures (GB50204 - 2015). In addition, the concrete in the present invention reaches 70% of the designed strength through manual inspection before the formwork is removed. Additionally, in the above steps, when positioning and setting out are required, a total station or GPS can be used for precise positioning.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the invention claimed. The scope of the invention claimed is defined by the appended claims and their equivalents.

Claims

1. A settlement prevention and control device for the foundation of a high-low leg iron tower, comprising four foundation columns of equal length and distributed in a rectangular array. The foundation columns are all vertically arranged, and two foundation columns on the same side are the first foundation columns, and the other two foundation columns are the second foundation columns. The top end of the second foundation column is higher than the top end of the first foundation column, and it is characterized in that: A bearing base is installed at the bottom end of each foundation column, and a horizontally distributed bearing cage is sleeved among the four foundation columns. An X-shaped cross anchor mechanism is installed between the two first foundation columns and between the two second foundation columns. The cross anchor mechanisms are all located above the bearing cage. A support mechanism is also installed between the first foundation column and the second foundation column on the same side. The support mechanisms are all located above the bearing cage. Each support mechanism includes two vertically and oppositely distributed standpipes. A connecting beam is installed between the tops of the two standpipes, and the two standpipes are respectively connected to the first foundation column and the second foundation column.

2. The settlement prevention device for the high-low leg iron tower foundation according to claim 1, characterized in that: The cross anchor mechanism includes two anchor rods. The middle positions of the two anchor rods are connected to form an X-shaped structure, and both ends of each anchor rod are connected to the first foundation column and the second foundation column through first connecting bolts.

3. The settlement prevention and control device for the high-low leg iron tower foundation according to claim 2, characterized in that: The connection position of the two anchor rods is hinged, and a connecting seat is hinged to the end of each anchor rod. The connecting seat is connected to the first foundation column and the second foundation column through the first connecting bolts.

4. The settlement prevention device for the high-low leg iron tower foundation according to claim 1, characterized in that: The top heights of the two standpipes in each group of support mechanisms are different.

5. The settlement prevention device for the high-low leg iron tower foundation according to claim 1, wherein: The standpipe is connected to the first foundation column and the second foundation column through second connecting bolts.

6. A construction method of a settlement prevention device for a high-low leg iron tower foundation according to any one of claims 1-5, characterized in that: It includes the following steps: Step 1: Construction and pouring of the bearing base; Step 2: Construction and installation of the bearing cage and the foundation column; Step 3: Construction and installation of the support mechanism; Step 4: Construction and installation of the cross anchor mechanism.

7. The construction method of a settlement prevention device for a high-low leg iron tower foundation according to claim 6, characterized in that: In Step 1: The bearing base is a multi-layer stepped base. First step, positioning and setting out the lines; second step, excavating the foundation pit of the bearing base in sections; third step, sequentially laying the steel bar cages of the bearing base in layers in the foundation pit of the bearing base, and sequentially installing templates on the steel bar cages, and pouring concrete in layers; fourth step, reserving an installation opening for installing the foundation column on the top surface of the bearing base; fifth step, removing the templates and conducting acceptance inspection and testing of the bearing base.

8. A construction method of a settlement prevention device for a high-low leg iron tower foundation according to claim 7, characterized in that: In Step 2: First step, taking the positions of the four bearing bases as a reference, positioning and setting out the lines; second step, excavating the foundation pit of the bearing cage; third step, weaving the steel bar cages of the bearing cage and the four foundation columns; fourth step, respectively passing the steel bar cages of the four foundation columns through the four corners of the bearing cage and then connecting them, and leaving gaps for installing templates between the circumferences of the steel bar cages of the bearing cage and the foundation columns, and detecting the spatial position and elevation of the bearing cage; fifth step, respectively inserting the steel bar cages of the foundation columns into the installation openings of the bearing base, and installing templates on the steel bar cages of the foundation columns; Sixth step, pouring concrete; Seventh step, removing the templates and conducting acceptance inspection and testing of the foundation column.

9. The construction method of a settlement prevention device for a high-low leg iron tower foundation according to claim 8, characterized in that: In Step 3: First step, prefabricating and pouring the support mechanism, and reserving bolt installation through holes on the standpipes; second step, respectively placing the support mechanisms between the first foundation column and the second foundation column, and using second connecting bolts to connect the standpipes to the first foundation column and the second foundation column respectively to complete the installation of the support mechanism.

10. The construction method of a settlement prevention device for a high-low leg iron tower foundation according to claim 8, characterized in that: In Step 4: First, prefabricate the cross-anchor mechanism and reserve bolt installation through holes at the ends of the cross-anchor mechanism; Second, place the cross-anchor mechanism between two first foundation columns and between two second foundation columns respectively; Third, use the first connecting bolts to connect the ends of the cross-anchor mechanism to the first foundation column and the second foundation column respectively, complete the installation of the cross-anchor mechanism, and backfill the soil.

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