A settlement prevention device for high-low leg iron tower foundation and a construction method thereof

Abstract

The application relates to a settlement prevention device of a high-low-leg iron tower foundation and a construction method thereof, which comprises four foundation columns, two of which are first foundation columns, and the other two are second foundation columns, the top end of the second foundation column is higher than that of the first foundation column, a bearing base is arranged at the bottom end of each foundation column, and a bearing net cage is jointly arranged among the four foundation columns; an X-shaped cross anchor rod mechanism is arranged among the two first foundation columns and among the two second foundation columns; a supporting mechanism is arranged between the first foundation column and the second foundation column on the same side, and the supporting mechanism comprises two vertical and opposite distribution upright piles, a connecting beam is arranged between the top ends of the two upright piles, and the two upright piles are connected with the first foundation column and the second foundation column respectively, and the application can improve the stability of the high-low-leg iron tower foundation, so as to ensure the safe operation of the power transmission line.

Description

Technical Field

[0001] This invention belongs to the field of power transmission tower foundation reinforcement technology, and in particular relates to a settlement prevention device for high and low leg tower foundations and its construction method. Background Technology

[0002] Currently, in areas with complex terrain such as mountain slopes, the construction of power transmission lines inevitably requires the use of high-low leg transmission towers to adapt to the undulating terrain and irregular route. While 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 significant challenges.

[0003] Specifically, in the complex foundation conditions of collapsible loess areas, the soil structure will undergo severe deformation when the foundation is exposed to water. The existing high and low leg tower foundations are prone to foundation settlement and structural instability during long-term loading, which threatens 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 this invention is to provide a settlement prevention device and construction method for high and low leg iron tower foundations, so as to solve the problems mentioned in the background art.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: A settlement prevention device for high and low leg iron tower foundation includes four foundation columns of equal length arranged in a rectangular array. The foundation columns are all vertically arranged, and the 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 of the second foundation columns is higher than the top of the first foundation columns. Each foundation column is equipped with a bearing base at its bottom, and the four foundation columns are fitted together with a horizontally distributed bearing net cage. 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 cage. A support mechanism is also installed between the first foundation columns and the second foundation columns on the same side, and the support mechanism is located above the load-bearing cage. The support mechanism includes two vertically opposite piles, and a connecting beam is installed between the tops of the two piles. The two piles are connected to the first foundation column and the second foundation column, respectively.

[0006] Furthermore, the cross anchor mechanism includes two anchor rods connected at the middle position 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 by a first connecting bolt.

[0007] Furthermore, the two anchor rods are connected by a hinge, and each anchor rod has a connecting seat hinged at its end. The connecting seat is connected to the first foundation column and the second foundation column by the first connecting bolt.

[0008] Furthermore, the top heights of the two pillars in each support structure are different.

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

[0010] Furthermore, the construction method of the settlement prevention device for the above-mentioned high and low leg iron tower foundation includes the following steps: Step 1: Construction and pouring of the supporting base; Step 2: Construction and installation of the load-bearing wire mesh cage and foundation columns; Step 3: Construction and installation of support mechanisms; Step 4: Construction and installation of the cross anchor bolt mechanism.

[0011] Furthermore, in step one: the bearing base is a multi-layer stepped base. The first step is to position and lay out the lines; the second step is to excavate the foundation pit of the bearing base in sections; the third step is to place the steel mesh cage of the bearing base layer by layer in the foundation pit of the bearing base, and install the formwork on the steel mesh cage layer by layer, and pour concrete layer by layer; the fourth step is to reserve the installation opening for installing the foundation column on the top surface of the bearing base; the fifth step is to remove the formwork and conduct acceptance testing of the bearing base.

[0012] Furthermore, in step two: First, using the positions of the four bearing bases as references, position and lay out the lines; second, excavate the foundation pit for the bearing mesh cage; third, weave the bearing mesh cage and the steel mesh cages for the four foundation columns; fourth, connect the steel mesh cages of the four foundation columns by passing them through the four corners of the bearing mesh cage, leaving gaps for installing the templates around the circumference of the bearing mesh cage and the steel mesh cages of the foundation columns, and check the spatial position and elevation of the bearing mesh cage; fifth, insert the steel mesh cages of the foundation columns into the installation openings of the bearing bases, and install the templates on the steel mesh cages of the foundation columns; sixth, pour concrete; seventh, remove the templates and conduct acceptance testing of the foundation columns.

[0013] Furthermore, in step three: First, precast the support structure and leave bolt mounting holes on each pile; second, place the support structure between the first foundation column and the second foundation column, and use the second connecting bolts to connect the pile to the first foundation column and the second foundation column respectively, thus completing the installation of the support structure.

[0014] Furthermore, in step four: First, prefabricate the cross anchor mechanism and reserve bolt mounting holes at the ends of the cross anchor mechanism; second, place the cross anchor mechanism between the two first foundation columns and between the two second foundation columns respectively; third, use the first connecting bolts to connect the ends of the cross anchor mechanism to the first foundation columns and the second foundation columns respectively, to complete the installation of the cross anchor mechanism and backfill the soil.

[0015] The beneficial effects of the present invention by adopting the above technical solution are as follows: The four foundation columns of this invention can form a high-low leg tower foundation. By setting a bearing base and a bearing cage in conjunction, a stable foundation platform can be formed between the four foundation columns. This increases the overall structural rigidity and enhances the load-bearing capacity of the high-low leg tower foundation. Secondly, by setting a support mechanism, the first and second foundation columns can support each other. Furthermore, by setting a cross anchor mechanism, the coordination between the foundation columns can be enhanced, thereby achieving multi-dimensional reinforcement of the foundation columns. This improves the stability, anti-settlement deformation capacity, and service life of the high-low leg tower foundation, ensuring the safe operation of the transmission line. Attached Figure Description

[0016] Figure 1 This is one of the structural schematic diagrams of the present invention; Figure 2 This is the second structural schematic diagram of the present invention; Figure 3 This is a top-view structural diagram of part of the device of the present invention; Figure 4 This is one of the structural schematic diagrams of some of the devices of the present invention; Figure 5 This is a second schematic diagram of the structure of part of the device of the present invention; Figure 6 This is a construction flowchart of the present invention.

[0017] Reference numerals in the attached drawings: 1. Supporting base; 2. Supporting cage; 3. First foundation column; 4. Second foundation column; 5. Cross anchor mechanism; 51. Anchor bolt; 52. First connecting bolt; 6. Support mechanism; 61. Pile; 62. Connecting beam; 63. Second connecting bolt; 7. Iron tower. Detailed Implementation

[0018] To make the objectives, technical solutions, and beneficial effects of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0019] like Figures 1 to 5As shown, this invention provides a settlement prevention device for a high-low leg iron tower foundation, comprising four foundation columns of equal length arranged in a rectangular array. All foundation columns are vertically arranged, with two foundation columns on the same side forming the first foundation column 3, and the remaining two forming the second foundation column 4. The top of the second foundation column 4 is higher than the top of the first foundation column 3. The four foundation columns together form a high-low leg iron tower foundation, which can support the iron tower 7 during use. Each foundation column has a bearing base 1 installed at its bottom, laid horizontally. A horizontally distributed bearing mesh cage 2 is fitted around the four foundation columns. Specifically, the bearing base 1 and the bearing mesh cage 2 work together to form a stable foundation platform with the four foundation columns, thus increasing the overall structural rigidity and enhancing the load-bearing capacity of the high-low leg iron tower foundation.

[0020] Secondly, X-shaped cross anchor bolt mechanisms 5 are installed between the two first foundation columns 3 and between the two second foundation columns 4, and the cross anchor bolt mechanisms 5 are all located above the load-bearing cage 2. Support mechanisms 6 are also installed between the first foundation columns 3 and the second foundation columns 4 on the same side, and the support mechanisms 6 are all located above the load-bearing cage 2. Each support mechanism 6 includes two vertically opposite piles 61, and a connecting beam 62 is installed between the tops of the two piles 61. The two piles 61 are respectively connected to the first foundation column 3 and the second foundation column 4. Specifically, by setting up the support mechanisms 6, the first foundation columns 3 and the second foundation columns 4 can support each other to ensure the coordinated stability of the structure. Furthermore, by setting up the cross anchor bolt mechanisms 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 tower foundation, so as to ensure the safe operation of the transmission line.

[0021] The specific configuration of the cross anchor bolt mechanism 5 is as follows: Figure 2 and Figure 5 As shown, the cross anchor bolt mechanism 5 includes two anchor bolts 51, which are connected at the middle to form an X-shaped structure. Both ends of each anchor bolt 51 are connected to the first foundation column 3 and the second foundation column 4 via first connecting bolts 52. Specifically, each anchor bolt 51 has bolt mounting through holes parallel to its axial direction around its end. Threaded tubes are embedded in the foundation columns to connect the two ends of the anchor bolts 51 to the foundation columns via the first connecting bolts 52, thus enhancing the coordination between the foundation columns. Furthermore, washers can be fitted onto the first connecting bolts 52 to increase their tightening force. Additionally, high-strength low-alloy steel, such as Q345, can be used to make the first connecting bolts 52 to improve their performance and service life. Secondly, the anchor bolts 51 can be prestressed to enhance their resistance to deformation and pull-out.

[0022] Furthermore, the connection between the two anchor rods 51 is hinged, and each anchor rod 51 has a connecting seat hinged at its end. The connecting seat is connected to the first foundation column 3 and the second foundation column 4 through the first connecting bolt 52. Specifically, since the middle position of the two anchor rods 51 is hinged, the horizontal distance between the two ends of the cross anchor rod mechanism 5 can be flexibly adjusted according to the horizontal distance between the two foundation columns during use, so as to facilitate the installation of the cross anchor rod mechanism 5 between the two foundation columns. After adjustment, by hinged connecting seats at the ends of the anchor rods 51, it does not affect the connection of the two ends of the anchor rods 51 to the foundation columns through the first connecting bolt 52. That is, bolt mounting through holes for installing the first connecting bolt 52 are opened on the connecting seat.

[0023] Furthermore, such as Figure 1 and Figure 4 As shown, the top heights of the two piles 61 in each support mechanism 6 are different, which allows the connecting beams 62 to be distributed at an angle, thus forming a wedge-shaped support structure. The inclination angle of the connecting beams 62 can be designed according to the height difference between the first foundation column 3 and the second foundation column 4, so that the support mechanism 6 conforms to the distribution of the first foundation column 3 and the second foundation column 4. In addition, the bottom heights of the two piles 61 in each support mechanism 6 can be the same, which allows the support mechanism 6 to form a right-angled trapezoidal structure around its circumference, ensuring the stability of the support mechanism 6 itself. Furthermore, an epoxy resin coating or similar material can be applied to the outer surface of the support mechanism 6 to provide anti-corrosion treatment, thereby enhancing the durability and corrosion resistance of the support mechanism 6.

[0024] Furthermore, such as Figure 1 and Figure 4 As shown, the pile 61 is connected to the first foundation column 3 and the second foundation column 4 via second connecting bolts 63. Specifically, bolt mounting through holes are horizontally provided on both sides of the pile 61, and threaded tubes are embedded in the foundation column to connect the pile 61 to the foundation column via the second connecting bolts 63. This allows the first foundation column 3 and the second foundation column 4 to support each other. In addition, washers can be fitted on the second connecting bolts 63 to improve the tightening force of the second connecting bolts 63. Furthermore, high-strength low-alloy steel, such as Q345 material, can be used to make the second connecting bolts 63 to improve their performance and service life.

[0025] Furthermore, such as Figure 6 As shown, the construction method of the settlement prevention device for the above-mentioned high and low leg iron tower foundation includes the following steps: Step 1: Construction and pouring of the bearing base 1; Step 2: Construction and installation of the load-bearing wire mesh cage 2 and the foundation columns; Step 3: Construction and installation of support mechanism 6; Step 4: Construction and installation of the cross anchor bolt mechanism 5.

[0026] Furthermore, in step one: the bearing base 1 is a multi-layered stepped base; the first step is to clean the site to ensure the flatness and geometric accuracy of the foundation, and to position and lay out the lines according to the design drawings; the second step is to excavate the foundation pit of the bearing base 1 according to the design requirements; the third step is to place the steel mesh cage of the bearing base 1 layer by layer in the foundation pit of the bearing base 1, and install the formwork on the steel mesh cage in sequence, pour concrete in layers, and use mechanical vibration to ensure the density and homogeneity of the concrete. After the pouring is completed, the concrete is cured in accordance with regulations; the fourth step is to reserve the installation opening for the foundation column on the top surface of the bearing base 1. The installation opening can be adjusted according to the type of foundation column; the fifth step is to remove the formwork after the concrete reaches the design strength, and to conduct acceptance testing on the size, position, and elevation of the bearing base 1 to form the bearing base 1 and to give the bearing base 1 a certain load-bearing capacity.

[0027] Furthermore, in step two: First, using the positions of the four supporting bases 1 as references, the locations are laid out according to the design drawings; second, the foundation pit for the supporting mesh cage 2 is excavated according to the design requirements; third, using steel mesh cage weaving technology, the supporting mesh cage 2 and four steel mesh cages that match the shape of the foundation columns are woven; fourth, the steel mesh cages of the four foundation columns are connected after passing through the four corners of the supporting mesh cage 2, and gaps for installing templates are left circumferentially between the supporting mesh cage 2 and the steel mesh cages of the foundation columns, and the spatial position and markings of the supporting mesh cage 2 are checked. The first step is to ensure a precise connection between the load-bearing mesh cage 2 and the four foundation columns; the second step is to insert the steel mesh cages of the foundation columns into the installation openings of the load-bearing base 1, and install templates on the steel mesh cages of the foundation columns; the third step is to pour concrete, and after pouring, to cure the concrete according to regulations; the fourth step is to remove the templates after the concrete reaches the design strength, and to conduct acceptance tests on the dimensions, positions, and elevations of the foundation columns to form the load-bearing mesh cage 2 and the high and low leg tower foundation; and after the concrete of the foundation columns is formed, the foundation columns and the load-bearing base 1 can be stably connected.

[0028] Furthermore, in step three: First, according to the relative positions between the foundation columns, the support mechanism 6 is precast and cast. The support mechanism 6 is also made of steel mesh cage and concrete casting, and bolt installation through holes for installing the second connecting bolts 63 are reserved on the piles 61. The support mechanism 6 can also be surface-treated for corrosion protection. Second, the support mechanism 6 is placed between the first foundation column 3 and the second foundation column 4 respectively, and the piles 61 are connected to the first foundation column 3 and the second foundation column 4 respectively using the second connecting bolts 63 to complete the installation of the support mechanism 6.

[0029] Furthermore, in step four: First, prefabricate the cross anchor mechanism 5 according to the relative positions between the foundation columns, and reserve bolt mounting through holes for installing the first connecting bolt 52 at the ends of the cross anchor mechanism 5; Second, place the cross anchor mechanism 5 between the two first foundation columns 3 and the two second foundation columns 4 respectively; Third, use the first connecting bolt 52 to connect the ends of the cross anchor mechanism 5 to the first foundation column 3 and the second foundation column 4 respectively, to complete the installation of the cross anchor mechanism 5 and backfill the soil.

[0030] Furthermore, the construction standards for concrete pouring in this invention comply with the relevant provisions of GB50204-2015 "Code for Acceptance of Construction Quality of Concrete Structures"; in addition, the concrete in this invention is all tested manually to reach 70% of the design strength before the formwork is removed; furthermore, when positioning and setting out are required in the above steps, a total station or GPS can be used for precise positioning.

[0031] The foregoing has shown and described 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 to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A settlement prevention device for a high-low leg iron tower foundation, comprising four foundation columns of equal length arranged in a rectangular array, wherein all foundation columns are vertically arranged, and two foundation columns on the same side are designated as first foundation columns, and the remaining two foundation columns are designated as second foundation columns, wherein the top of the second foundation columns is higher than the top of the first foundation columns, characterized in that: Each foundation column is equipped with a load-bearing base at its bottom, and the four foundation columns are all fitted together with a horizontally distributed load-bearing mesh cage. An X-shaped cross anchor mechanism is installed between the two first foundation columns and between the two second foundation columns. The cross anchor mechanism is located above the load-bearing cage. A support mechanism is also installed between the first foundation columns and the second foundation columns on the same side. The support mechanism is located above the load-bearing cage. The support mechanism includes two vertically opposite piles. A connecting beam is installed between the tops of the two piles. The two piles are connected to the first foundation column and the second foundation column, respectively. The cross anchor mechanism includes two anchors, which are connected at the middle to form an X-shaped structure, and both ends of each anchor are connected to the first foundation column and the second foundation column by a first connecting bolt. The two anchor rods are connected by a hinge, and each anchor rod has a connecting seat at its end. The connecting seat is connected to the first foundation column and the second foundation column by the first connecting bolt. The top heights of the two piles in each support structure are different, while the bottom heights of the two piles in each support structure are the same.

2. The settlement prevention device for high and low leg iron tower foundations according to claim 1, characterized in that: The piles are connected to the first foundation column and to the second foundation column by second connecting bolts.

3. A method for constructing a settlement prevention device for a high-low leg iron tower foundation as described in any one of claims 1-2, characterized in that: Includes the following steps: Step 1: Construction and pouring of the supporting base; Step 2: Construction and installation of the load-bearing wire mesh cage and foundation columns; Step 3: Construction and installation of support mechanisms; Step 4: Construction and installation of the cross anchor bolt mechanism.

4. The construction method of a settlement prevention device for a high-low leg iron tower foundation according to claim 3, characterized in that: In step one: the bearing base is a multi-layer stepped base. The first step is to position and lay out the lines; the second step is to excavate the foundation pit of the bearing base in sections; the third step is to place the steel mesh cage of the bearing base layer by layer in the foundation pit of the bearing base, and install the formwork on the steel mesh cage layer by layer, and pour concrete layer by layer; the fourth step is to reserve the installation opening for the foundation column on the top surface of the bearing base; the fifth step is to remove the formwork and inspect and accept the bearing base.

5. The construction method of a settlement prevention device for a high-low leg iron tower foundation according to claim 4, characterized in that: In step two: First, using the positions of the four support bases as references, locate and lay out the lines; second, excavate the foundation pit for the support mesh cage; third, weave the support mesh cage and the steel mesh cages for the four foundation columns; fourth, connect the steel mesh cages of the four foundation columns by passing them through the four corners of the support mesh cage, leaving gaps for installing templates around the circumference of the support mesh cage and the steel mesh cages of the foundation columns, and check the spatial position and elevation of the support mesh cage; fifth, insert the steel mesh cages of the foundation columns into the installation openings of the support bases, and install templates on the steel mesh cages of the foundation columns. Step 6: Pour concrete; Step 7: Remove the formwork and conduct acceptance testing on the foundation columns.

6. The construction method of a settlement prevention device for a high-low leg iron tower foundation according to claim 5, characterized in that: In step three: First, precast the support structure and leave bolt mounting holes on each pile; second, place the support structure between the first foundation column and the second foundation column, and use the second connecting bolts to connect the pile to the first foundation column and the second foundation column respectively, thus completing the installation of the support structure.

7. The construction method of a settlement prevention device for a high-low leg iron tower foundation according to claim 5, characterized in that: In step four: First, prefabricate the cross anchor mechanism and reserve bolt mounting holes at the ends of the cross anchor mechanism; second, place the cross anchor mechanism between the two first foundation columns and between the two second foundation columns; third, use the first connecting bolts to connect the ends of the cross anchor mechanism to the first foundation columns and the second foundation columns respectively, to complete the installation of the cross anchor mechanism and backfill the soil.

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