Iron tower foundation reinforcing structure and method

Abstract

The invention relates to the technical field of power transmission iron tower foundation reinforcement, in particular to an iron tower foundation reinforcement structure and method.The iron tower foundation reinforcement structure comprises a bearing platform, inclined anchor rods, a cushion layer and grouting holes, the grouting holes are formed in a soil body around an original iron tower foundation in the circumferential direction of the original iron tower foundation, and pressure grouting is conducted; holes and cracks are locally filled through extrusion of soil around the original foundation of the iron tower and permeation of slurry, so that the bearing capacity is improved; the bearing platform is formed on the original foundation of the iron tower and is matched with the inclined anchor rods, so that the pulling resistance and the lateral supporting force of the original foundation of the iron tower are improved, the reinforcing effect on the original foundation of the iron tower is achieved, the stability of the original foundation of the iron tower under complex working conditions and severe environments is enhanced, and normal and safe operation of a power transmission line is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission tower foundation reinforcement, and in particular to a tower foundation reinforcement structure and a reinforcement method. Background Art

[0002] Since the foundation of the transmission tower has been affected by factors such as natural environmental erosion, extreme climate environment and external forces for a long time, it may experience aging and damage phenomena such as settlement, concrete cracking, and steel corrosion to varying degrees, which seriously threatens the safe and stable operation of the transmission line. Therefore, there is an urgent need for an effective tower foundation reinforcement structure and reinforcement method to improve the stability of the tower in harsh environments, provide strong guarantees for the safe and stable operation of the transmission line, and reduce the safety risks and economic losses caused by foundation problems. Summary of the invention

[0003] The object of the present invention is to provide a tower foundation reinforcement structure and a reinforcement method to improve the stability of the tower in a harsh environment. The specific technical scheme is as follows:

[0004] A tower foundation reinforcement structure, comprising:

[0005] A capping platform, which is formed on the original foundation of the iron tower and extends outwardly from the outer edge of the original foundation of the iron tower;

[0006] A plurality of inclined anchor rods, which are installed in the cap and inserted downward into the soil around the original foundation of the iron tower;

[0007] A cushion layer is arranged below the support platform and extends outwardly from the outer edge of the support platform, and the cushion layer is directly connected to the ground.

[0008] Furthermore, the pedestal is a reinforced concrete structure, and a shear member is provided between the pedestal and the original foundation of the tower.

[0009] Furthermore, the foundation includes a steel cage, which is arranged on the outer periphery of the original foundation of the tower and surrounds the tower foot.

[0010] Furthermore, the steel cage includes main stress-bearing bars, outer stirrups and inner stirrups. A plurality of main stress-bearing bars are arranged at equal intervals in the vertical direction. The outer stirrups are evenly spaced around the outside of the main stress-bearing bars, and the inner stirrups are evenly spaced around the inside of the main stress-bearing bars. The outer stirrups and the inner stirrups are fixedly connected to the main stress-bearing bars.

[0011] Furthermore, steel meshes are arranged at the upper and lower ends of the part of the tower foot located in the foundation, and the steel meshes are fixedly connected to the steel cage.

[0012] Furthermore, the inclined anchor rod includes an anchor bar and a cement mortar layer, one end of the anchor bar is embedded in the steel cage and fixedly connected to the steel cage, and the other end of the anchor bar is inserted into the soil near the original foundation of the tower; the part of the anchor bar inserted into the soil is cast with a cement mortar layer.

[0013] Furthermore, the end of the anchor bar embedded in one end of the steel cage is connected to a steel plate, and the steel plate is welded to the steel cage.

[0014] Furthermore, grouting holes are opened in the soil around the original foundation of the tower along the circumference of the original foundation of the tower, and the depth of the grouting holes is less than the depth of the original foundation of the tower below the ground.

[0015] A tower foundation reinforcement method, using the tower foundation reinforcement structure as described above to reinforce the original tower foundation, comprises the following steps:

[0016] Step S1, excavating around the original foundation of the iron tower until the original soil layer is exposed, drilling grouting holes in the soil around the original foundation of the iron tower along the circumference of the original foundation of the iron tower, and grouting the grouting holes with concrete or slightly expansive cement slurry;

[0017] Step S2, cleaning and leveling the site around the original foundation of the tower, and pouring a cushion layer around the original foundation of the tower;

[0018] Step S3, welding steel mesh at the bottom and upper designated positions of the tower foot; inserting shear members along the circumferential direction at designated positions on the side of the original foundation of the tower;

[0019] Step S4, a steel cage is arranged on the periphery of the original foundation of the iron tower, the upper ends of multiple anchor bars are inserted into the steel cage according to the specified incident angle, and the anchor bars, the steel cage and the steel plate are welded at the ends of the anchor bars to form an integral structure, the lower ends of the anchor bars are embedded in the soil near the original foundation of the iron tower, and cement mortar is poured at the parts where the anchor bars are embedded in the soil;

[0020] Step S5, roughening the contact surface between the original foundation of the tower and the cap; pouring concrete on the steel cage and anchor bars and curing them until they reach the designed strength.

[0021] Furthermore, in step S1, when drilling the grouting holes and injecting grout, the opposite sides are drilled one by one and the grouting is injected one by one. After the grouting of one grouting hole is solidified, the drilling and grouting construction of the next grouting hole is carried out.

[0022] The application of the technical solution of the present invention has the following beneficial effects:

[0023] (1) The present invention provides a tower foundation reinforcement structure, in which grouting holes are opened in the soil around the original tower foundation along the circumference of the original tower foundation and pressure grouting is performed. By squeezing the soil around the original tower foundation and infiltrating the slurry, cavities and cracks are partially filled, thereby improving the bearing capacity; a pedestal is formed on the original tower foundation and used in conjunction with inclined anchor rods to improve the pull-out resistance and lateral support force of the original tower foundation, thereby achieving a reinforcement effect on the original tower foundation, enhancing the stability of the tower foundation under complex working conditions and harsh environments, and ensuring the normal and safe operation of the transmission line.

[0024] (2) In the present invention, steel mesh is arranged at the upper and lower ends of the part of the tower foot located in the foundation. By arranging the steel mesh, the tensile stress on both sides of the crack can be borne, thereby limiting the development of the crack.

[0025] (3) In the present invention, grouting holes are opened in the soil around the original foundation of the iron tower along the circumference of the original foundation of the iron tower. The depth of the grouting holes is less than the depth of the original foundation of the iron tower below the ground, so as to prevent the original foundation of the iron tower from being lifted and damaged after grouting.

[0026] (4) In the present invention, the cushion layer can be provided to disperse the upper load to the soil, and can prevent moisture and the like from corroding the concrete structure of the foundation, thereby ensuring the durability of the foundation.

[0027] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is an overall schematic diagram of the iron tower foundation reinforcement structure in the present invention;

[0030] Figure 2 It is a schematic diagram of the arrangement of grouting holes;

[0031] Figure 3 It is a top view of the connection between the inclined anchor rod and the steel cage and the original foundation of the tower;

[0032] Figure 4 It is a schematic diagram of the connection between the steel mesh and the tower foot;

[0033] Among them, 1. Capping platform, 1.1. Steel cage, 1.1.1. Main stress-bearing reinforcement, 1.1.2. External stirrups, 1.1.3. Internal stirrups, 1.2. Steel mesh, 2. Original foundation of the tower, 3. Inclined anchor rods, 3.1. Anchor bars, 3.2. Cement mortar layer, 3.3. Steel plate, 4. Cushion layer, 5. Shear members, 6. Tower foot, 7. Grouting holes. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered.

[0035] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "front", "back", "lateral", "longitudinal" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] Example:

[0038] See also Figure 1 , this embodiment provides a tower foundation reinforcement structure, including:

[0039] A capping platform 1, wherein the capping platform 1 is formed on the original foundation 2 of the iron tower and extends outwardly from the outer edge of the original foundation 2 of the iron tower;

[0040] A plurality of inclined anchor rods 3, wherein the inclined anchor rods 3 are installed in the cap 1 and inserted downward into the soil around the original foundation 2 of the iron tower;

[0041] The cushion layer 4 is arranged below the cap 1 and extends outwardly from the outer edge of the cap 1. The cushion layer 4 is directly connected to the ground. In this embodiment, the cushion layer 4 is cast with concrete of strength grade C15. The cushion layer 4 is provided to disperse the upper load to the soil, prevent moisture and the like from corroding the concrete structure of the cap 1, and ensure the durability of the cap 1. The thickness of the cushion layer 4 and the strength grade of the concrete can be adaptively adjusted according to the actual soil layer conditions.

[0042] Grouting holes 7: Multiple grouting holes 7 are opened in the soil around the original foundation 2 of the iron tower along the circumference of the original foundation 2 of the iron tower. Concrete or micro-expansion cement slurry is used to fill the holes, partially fill the cavities and cracks of the original foundation of the iron tower, and increase the protective layer of the foundation steel bars. Figure 2 Preferably, the grouting holes 7 are arranged opposite to each other in pairs along the circumference of the original foundation 2 of the iron tower, and the number of the grouting holes 7 is arranged according to the diameter of the original foundation 2 of the iron tower and a certain hole spacing is maintained; the depth of the grouting holes 7 is less than the depth of the original foundation 2 of the iron tower below the ground to prevent the original foundation 2 of the iron tower from being jacked up and damaged after grouting.

[0043] The cap 1 is a reinforced concrete structure, and a shear member 5 is arranged between the cap 1 and the original foundation 2 of the iron tower. Specifically, a plurality of shear members 5 are arranged along the circumferential direction on the side of the original foundation 2 of the iron tower, and the shear members 5 are full-thread bolts, one end of the shear member 5 is inserted into the concrete structure of the original foundation 2 of the iron tower, and the other end is in the concrete structure of the cap 1. The cap 1 is connected to the original foundation 2 of the iron tower through the shear member 5, so that the cap 1 and the original foundation 2 of the iron tower work together to bear the load transmitted from the upper iron tower.

[0044] The cap 1 includes a steel cage 1.1, which is arranged on the outer periphery of the original foundation 2 of the iron tower and surrounds the iron tower foot 6. Figure 1 and Figure 4 The upper and lower ends of the tower foot 6 located in the base 1 are arranged with steel mesh 1.2, and the steel mesh 1.2 is fixedly connected to the steel cage 1.1. By setting the steel mesh 1.2, the tensile stress on both sides of the crack can be borne to limit the development of the crack.

[0045] In this embodiment, see Figure 3 The steel cage 1.1 includes a main stress-bearing reinforcement 1.1.1, an outer stirrup 1.1.2 and an inner stirrup 1.1.3. A plurality of main stress-bearing reinforcements 1.1.1 are arranged at equal intervals in the vertical direction. The outer stirrups 1.1.2 are evenly spaced around the outside of the main stress-bearing reinforcement 1.1.1. The inner stirrups 1.1.3 are evenly spaced around the inside of the main stress-bearing reinforcement 1.1.1. The outer stirrups 1.1.2 and the inner stirrups 1.1.3 are respectively fixedly connected to the main stress-bearing reinforcement 1.1.1 by welding or binding.

[0046] In this embodiment, see Figure 3 The inclined anchor rod 3 includes an anchor bar 3.1 and a cement mortar layer 3.2. One end of the anchor bar 3.1 is embedded in the steel cage 1.1 and fixedly connected to the steel cage 1.1, and the other end of the anchor bar 3.1 is inserted into the soil near the original foundation 2 of the iron tower; the portion of the anchor bar 3.1 inserted into the soil is cast with a cement mortar layer 3.2. The incident angle of the anchor bar 3.1 embedded in the steel cage 1.1 and the length of the anchor bar 3.1 inserted into the soil can be adjusted according to the actual stress conditions.

[0047] In this embodiment, the end of the anchor bar 3.1 embedded in one end of the steel cage 1.1 is connected to a steel plate 3.3, and the steel plate 3.3 is welded to the steel cage 1.1; the provision of the steel plate can increase the contact area between the anchor bar 3.1 and the steel cage 1.1, and enhance the connection strength between the anchor bar 3.1 and the steel cage 1.1.

[0048] The tower foundation reinforcement structure provided in this embodiment can effectively solve the problem of insufficient pull-out resistance and lateral support force of the original foundation of the transmission tower under harsh environment and external force, provide more stable support for the tower foundation, enhance the stability of the tower foundation under various complex working conditions, and ensure the normal and safe operation of the transmission line.

[0049] This embodiment also provides a tower foundation reinforcement method, which uses the tower foundation reinforcement structure as described above to reinforce the original tower foundation, including the following steps:

[0050] Step S1, excavate around the original foundation 2 of the iron tower until the original soil layer is exposed, drill grouting holes 7 in the surrounding soil of the original foundation 2 of the iron tower along the circumference of the original foundation 2 of the iron tower, and the lowest point of the grouting holes 7 is 1.5 meters to 2 meters above the lowest point of the original foundation 2 of the iron tower to prevent the original foundation 2 of the iron tower from being jacked up and damaged after grouting; use concrete or slightly expansive cement slurry to grout the grouting holes 7.

[0051] Preferably, the grouting holes 7 are drilled one by one on the opposite side and grouting is performed one by one. After the grouting of one grouting hole 7 is solidified, the drilling and grouting of the next grouting hole 7 are performed. Figure 2 The order of drilling and grouting is a1-a2-b1-b2-c1-c2-d1-d2. Using this order for drilling and grouting can make the slurry more evenly distributed around the foundation soil, effectively avoid the cross-flow of slurry between different grouting holes 7, ensure the grouting quality of each grouting hole 7, and minimize the disturbance to the original foundation 2 of the tower.

[0052] Step S2, clean and level the site around the original foundation 2 of the tower, and use C15 strength grade concrete to cast a cushion layer 4 on the outer periphery of the original foundation 2 of the tower. The thickness of the cushion layer 4 is between 100 and 150 mm, and is 50 mm longer than the outer edge of the pedestal 1. The cushion layer 4 disperses the upper load to the ground and prevents moisture and the like from eroding the concrete structure of the pedestal 1, thereby ensuring the durability of the pedestal 1.

[0053] Step S3, welding steel mesh 1.2 at designated positions at the bottom and upper part of the tower foot 6; inserting a plurality of shear members 5 along the circumferential direction at designated positions on the side of the original foundation 2 of the tower and exposing a certain length.

[0054] Step S4, a steel cage 1.1 is arranged on the outer periphery of the original foundation 2 of the iron tower, the bottom of the steel cage 1.1 is connected to the cushion layer 4, and the upper part of the steel cage 1.1 is connected to the steel mesh 1.2 on the upper part of the iron tower foot 6;

[0055] The upper ends of the plurality of anchor bars 3.1 are inserted into the steel cage 1.1 at a specified incident angle, and the anchor bars 3.1, the steel cage 1.1 and the steel plate 3.3 are welded at the ends of the anchor bars 3.1 to form an integral structure, and the lower ends of the anchor bars 3.1 are embedded in the soil near the original foundation 2 of the iron tower until a certain length of the strongly weathered or moderately weathered rock is reached, and cement mortar is poured at the portion where the anchor bars 3.1 are embedded in the soil.

[0056] Step S5, roughen the contact surface between the original foundation 2 of the iron tower and the pedestal 1 to increase the roughness of the contact surface between the original foundation 2 of the iron tower and the pedestal 1, and improve the bonding force between the two; pour concrete on the steel cage 1.1 and the anchor bars 3.1 and maintain them until the design strength is reached. The original foundation 2 of the iron tower, the inclined anchor rods 3 and the pedestal 1 form a whole and work together to resist external loads.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tower foundation reinforcement structure, characterized in that: include: A capping platform (1), wherein the capping platform (1) is formed on the original foundation (2) of the iron tower and extends outwardly from the outer edge of the original foundation (2) of the iron tower; A plurality of inclined anchor rods (3), wherein the inclined anchor rods (3) are installed in the cap (1) and inserted downward into the soil around the original foundation (2) of the iron tower; A cushion layer (4), wherein the cushion layer (4) is arranged below the support platform (1) and extends outwardly from the outer edge of the support platform (1), and the cushion layer (4) is directly connected to the ground.

2. The iron tower foundation reinforcement structure according to claim 1, characterized in that: The capping platform (1) is a reinforced concrete structure, and a shear-resistant member (5) is arranged between the capping platform (1) and the original foundation (2) of the iron tower.

3. The iron tower foundation reinforcement structure according to claim 1, characterized in that: The foundation (1) comprises a steel cage (1.1), and the steel cage (1.1) is arranged on the outer periphery of the original foundation (2) of the iron tower and surrounds the iron tower foot (6).

4. The iron tower foundation reinforcement structure according to claim 3, characterized in that: The steel cage (1.1) comprises a main stress-bearing reinforcement (1.1.1), an outer stirrup (1.1.2) and an inner stirrup (1.1.3); a plurality of main stress-bearing reinforcements (1.1.1) are arranged at equal intervals in a vertical direction; the outer stirrups (1.1.2) surround the outer side of the main stress-bearing reinforcement (1.1.1) at equal intervals; the inner stirrups (1.1.3) surround the inner side of the main stress-bearing reinforcement (1.1.1) at equal intervals; and the outer stirrups (1.1.2) and the inner stirrups (1.1.3) are fixedly connected to the main stress-bearing reinforcement (1.1.1).

5. The iron tower foundation reinforcement structure according to claim 3, characterized in that: Steel mesh sheets (1.2) are arranged at the upper and lower ends of the part of the tower foot (6) located inside the foundation (1), and the steel mesh sheets (1.2) are fixedly connected to the steel cage (1.1).

6. The iron tower foundation reinforcement structure according to claim 3, characterized in that: The inclined anchor rod (3) comprises an anchor bar (3.1) and a cement mortar layer (3.2); one end of the anchor bar (3.1) is embedded in the steel cage (1.1) and fixedly connected to the steel cage (1.1); the other end of the anchor bar (3.1) is inserted into the soil near the original foundation (2) of the iron tower; and the cement mortar layer (3.2) is cast on the portion of the anchor bar (3.1) inserted into the soil.

7. The iron tower foundation reinforcement structure according to claim 6, characterized in that: The end of the anchor bar (3.1) embedded in one end of the steel cage (1.1) is connected to a steel plate (3.3), and the steel plate (3.3) is welded to the steel cage (1.1).

8. The iron tower foundation reinforcement structure according to any one of claims 1 to 7, characterized in that: Grouting holes (7) are opened in the soil around the original foundation of the iron tower (2) along the circumference of the original foundation of the iron tower (2), and the depth of the grouting holes (7) is less than the depth of the original foundation of the iron tower (2) below the ground.

9. A tower foundation reinforcement method, characterized in that: The original foundation of the iron tower is reinforced by using the iron tower foundation reinforcement structure as claimed in claim 8, comprising the following steps: Step S1, excavating around the original foundation (2) of the iron tower until the original soil layer is exposed, drilling grouting holes (7) in the surrounding soil of the original foundation (2) of the iron tower along the circumference of the original foundation (2) of the iron tower, and grouting the grouting holes (7) with concrete or micro-expansive cement slurry; Step S2, cleaning and leveling the site around the original foundation (2) of the iron tower, and pouring a cushion layer (4) around the original foundation (2) of the iron tower; Step S3, welding the steel mesh (1.2) at the bottom and upper designated positions of the tower foot (6); inserting the shear member (5) along the circumferential direction at the designated position on the side of the original foundation (2) of the tower; Step S4, a steel cage (1.1) is arranged on the periphery of the original foundation (2) of the iron tower, the upper ends of the plurality of anchor bars (3.1) are inserted into the steel cage (1.1) at a specified incident angle, and the anchor bars (3.1) are welded to the steel cage (1.1) and the steel plate (3.3) at the ends of the anchor bars (3.1) to form an integral structure, the lower ends of the anchor bars (3.1) are embedded in the soil near the original foundation (2) of the iron tower, and cement mortar is poured at the portion where the anchor bars (3.1) are embedded in the soil; Step S5, roughening the contact surface between the original foundation (2) of the iron tower and the cap (1); pouring concrete on the steel cage (1.1) and the anchor bars (3.1) and curing them until they reach the designed strength.

10. A tower foundation reinforcement method according to claim 9, characterized in that: In step S1, the grouting holes (7) are drilled and grouting is performed one by one on the opposite side, and grouting is performed one by one. After the grouting of one grouting hole (7) is solidified, the drilling and grouting construction of the next grouting hole (7) is carried out.

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