A main column reinforcing structure of a power transmission line board column foundation

Abstract

This utility model provides a main column reinforcement structure for power transmission line slab foundations. Based on the main column section to be poured, this utility model offers a distinctly different and highly adaptable reinforcement structure. The core lies in achieving reliable mechanical connection and load transfer between new and old concrete through a specialized reinforcement device combined with chemical anchoring technology. Addressing common issues in the main column section, the process is clear and straightforward, with highly operable steps, facilitating rapid on-site application by construction personnel and reducing delays. Utilizing chemical anchoring technology and high-strength connecting components, it significantly improves the reliability and long-term stability of the secondary pouring structure, effectively avoiding safety hazards associated with traditional methods. It prevents rework, reinforcement, and even foundation scrapping due to secondary pouring quality issues, reducing resource waste, shortening the construction period, and ensuring the timely commissioning and safe operation of power lines.

Description

Technical Field

[0001] This utility model relates to the field of power transmission lines, specifically to a main column reinforcement structure for power transmission line slab-column foundations. Background Technology

[0002] With the rapid development of power construction, the construction of slab-column foundations for overhead transmission line towers often encounters uncontrollable factors such as external obstruction or concrete quality defects, preventing one-time molding and necessitating unplanned secondary pouring. However, current technologies often handle such situations too simply (e.g., merely roughening the surface of the old concrete before direct secondary pouring), lacking scientific planning and refined design. This easily leads to critical issues such as insufficient bond strength between the old and new concrete, unclear load transfer paths, and damage to the overall integrity of the foundation. Ultimately, this makes it difficult to meet design requirements for core parameters such as the foundation's bearing capacity, overturning resistance, and settlement control, posing a risk of structural safety hazards. Therefore, a more scientific and reliable structure suitable for reinforcing the main columns of slab-column foundations is urgently needed to ensure the performance and safety of the foundation structure. Summary of the Invention

[0003] This utility model aims to overcome the shortcomings of the existing technology, which uses unplanned secondary pouring for the foundation of power transmission line slab columns. The existing methods are prone to insufficient bonding strength between the old and new concrete, discontinuous load transfer, and poor overall foundation integrity. Ultimately, they fail to meet the key parameters such as bearing capacity, overturning resistance, and settlement control required by the design, posing safety hazards. This utility model provides a main column reinforcement structure suitable for slab column foundations to solve the above problems.

[0004] To achieve the above objectives, this utility model provides a main column reinforcement structure for a power transmission line slab column foundation. The power transmission line slab column foundation includes a foundation step portion and a main column portion, with the main column portion located on top of the foundation step portion. The reinforcement structure includes a reinforcement device comprising a vertical steel pipe, a base plate, and stiffening ribs connecting the two. The base plate has arrayed anchor bolt pre-drilled holes. Anchor bolt holes are drilled on the upper surface of the foundation step portion, with the hole positions corresponding one-to-one with the anchor bolt pre-drilled holes on the base plate. Chemical anchor bolts are inserted through the pre-drilled holes and anchored into the corresponding anchor bolt holes. Concrete is poured into the vertical steel pipe of the reinforcement device to form the main column portion.

[0005] This utility model provides a distinctly different and highly adaptable reinforcement structure for the main column section to be poured. Its core lies in achieving a reliable mechanical connection and load transfer between new and old concrete through a specialized reinforcement device combined with chemical anchoring technology. Addressing common issues in the main column section, the process is clear and straightforward, with highly operable steps, facilitating rapid on-site application by construction personnel and reducing delays. Utilizing chemical anchoring technology and high-strength connecting components, it significantly improves the reliability and long-term stability of the secondary pouring structure, effectively avoiding the safety hazards associated with traditional methods. It prevents rework, reinforcement, and even foundation scrapping due to secondary pouring quality issues, reducing resource waste, shortening the construction period, and ensuring the timely commissioning and safe operation of power lines. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the secondary casting reinforcement structure for the main column of the slab-column foundation;

[0007] Figure 2 This is a schematic diagram of a secondary pouring reinforcement device for the main column of a slab-column foundation.

[0008] The following labels are used in the attached diagram: 1-Foundation step section; 2-Main column section; 3-Chemical anchor bolt; 4-Main column reinforcement device; 41-Vertical steel pipe; 42-Stiffening rib; 43-Base plate; 44-Anchor bolt reserved hole; 5-Concrete. Detailed Implementation

[0009] This utility model relates to the main column reinforcement structure of transmission line slab-column foundations. In specific implementation, a comprehensive assessment is first conducted based on construction site information (including the geometric dimensions of the already poured portion, such as length, width, and height) and initial foundation design parameters (such as bearing capacity and overturning resistance requirements) to select a specific secondary reinforcement application scenario: See [link to relevant documentation]. Figure 1 The main foundation columns are reinforced, and corresponding reinforcement design schemes are formulated according to the selected scenario.

[0010] When the component to be poured for the second time is the main column part 2 of the foundation, the site is first checked to ensure that the foundation step part 1 has been poured. Based on the initial foundation design information, the main column reinforcement device 4 is customized. The main column reinforcement device 4 is welded together by vertical steel pipe 41, stiffening ribs 42 and base plate 43 with arrayed anchor bolt reserved holes 44. After receiving the reinforcement plan and device, the construction unit drills anchor bolt holes that are precisely corresponding to the anchor bolt reserved holes 44 on the upper surface of the foundation step 1 and cleans the holes. Under the premise of protecting the main column reinforcement, the original formwork is removed and the main column reinforcement bundle is inserted into the vertical steel pipe 41 of the reinforcement device 4, so that the vertical steel pipe 41 replaces the formwork function. Then, the chemical anchor bolt 3 is inserted through the anchor bolt reserved hole 44 of the base plate 43 and implanted into the anchor bolt hole. The nut is tightened to fix the base plate 43 tightly to the step part 1. Finally, the main column secondary pouring concrete 5 is poured into the vertical steel pipe 41 and covered with a membrane for curing.

[0011] The concrete grade used for the secondary pour should be one strength grade higher than that of the concrete already poured.

[0012] When the component to be cast in the second phase is the main column 2, the inner diameter D and height H of the vertical steel pipe 41 of the reinforcement device 4 should match the design dimensions of the main column.

[0013] When the component to be cast a second time is the main column part 2, the diameter d of the chemical anchor 3 is... b and quantity n b The following conditions must be met: n b (πd b 2 / 4)τ b ≥1.5W Where: W—maximum overturning moment of the tower foundation (kN·m); τ b —Design value of shear strength of chemical anchor (MPa).

Claims

1. A main column reinforcement structure for a transmission line slab column foundation, the transmission line slab column foundation comprising a foundation step portion and a main column portion, wherein the main column portion is located on top of the foundation step portion, characterized in that, The reinforcement structure includes a reinforcement device comprising a vertical steel pipe, a base plate, and stiffening ribs connecting the two. The base plate has an array of pre-drilled anchor bolt holes. Anchor bolt holes are drilled on the upper surface of the foundation step portion, with the positions of the anchor bolt holes corresponding one-to-one with the pre-drilled anchor bolt holes on the base plate. Chemical anchor bolts are inserted through the pre-drilled holes and anchored into the corresponding anchor bolt holes. Concrete is poured into the vertical steel pipe of the reinforcement device to form the main column portion.

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