Tower footing protection structure

Abstract

The utility model relates to the technical field of power transmission towers, in particular to a tower footing protection structure which comprises a protection wall, the protection wall is arranged on the inner wall of a foundation pit, inner-ring stirrups and outer-ring stirrups are arranged in the protection wall, the inner-ring stirrups and the outer-ring stirrups are concentric with the foundation pit, the number of the inner-ring stirrups and the number of the outer-ring stirrups are both multiple, and the inner-ring stirrups and the outer-ring stirrups are evenly distributed in the axial direction. Inner ring tie bars and outer ring tie bars are further arranged in the protection wall, the inner ring tie bars and the outer ring tie bars are connected with the inner ring stirrups and the outer ring stirrups correspondingly, the multiple inner ring tie bars and the multiple outer ring tie bars are evenly distributed in the circumferential direction, and bent hooks are arranged at the top ends and the bottom ends of the inner ring tie bars and the outer ring tie bars correspondingly. And the hooks of the inner ring tie bar and the outer ring tie bar are respectively hooked on the inner ring stirrup and the outer ring stirrup. According to the scheme, the synergistic effect of the inner-ring stirrups, the outer-ring stirrups, the inner-ring tie bars and the outer-ring tie bars is combined, it is ensured that the retaining wall is evenly stressed, local stress concentration is avoided, the overall stability of the retaining wall is enhanced, and the overall performance of the retaining wall is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a power transmission tower technical field, concretely relates to a tower foundation protection structure. BACKGROUND

[0002] A power transmission tower is a key structure in a power transmission system, used to support high-voltage transmission lines and ensure their safe and stable operation. The foundation of a power transmission tower is an important component of the entire tower structure, as it not only bears the weight of the tower body but also resists external forces such as wind load and seismic force. A well-designed and constructed foundation is crucial for ensuring the safety and reliability of a power transmission tower.

[0003] During the construction of a power transmission tower foundation, excavating the foundation pit is the first and most critical step. The stability of the foundation pit directly affects the quality and safety of subsequent concrete pouring and other foundation construction operations. Therefore, when excavating the foundation pit, effective support measures must be taken to prevent the pit wall from collapsing, protect the safety of construction personnel, and ensure that the shape of the foundation pit meets the design requirements. To achieve these goals, it is common to use a retaining wall to support the foundation pit, which not only provides physical support to prevent the pit wall from sliding or collapsing due to its own weight, external pressure, or groundwater action, but also maintains the shape of the foundation pit, facilitating subsequent construction operations, while preventing water seepage and reducing construction difficulty and protecting the built foundation structure from water erosion.

[0004] The prior art discloses a stepped sectional foundation pit support structure, which includes an end retaining wall arranged at the edge of the foundation pit opening, and a plurality of layers of side retaining walls arranged below the end retaining wall and laid on the side wall of the foundation pit in a top-down direction. The side retaining walls as a whole present an inverted straight-angle trapezoidal shape with the upper part being larger and the lower part being smaller. This design enhances the overall stability of the foundation pit through the sectional retaining wall structure. Although the existing stepped sectional foundation pit support structure performs well in general cases, it is difficult to meet engineering requirements when facing special soil environments such as soft soil foundation, expansive soil, frost heaving soil, and highly corrosive soil, relying solely on concrete retaining walls. SUMMARY

[0005] The utility model intends to provide a tower foundation protection structure to solve the problem of poor support effect of the prior art when facing special soil environments such as soft soil foundation.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The application discloses a tower foundation protection structure, which comprises a protection wall arranged on the inner wall of a foundation pit, wherein an inner hoop and an outer hoop are arranged in the protection wall, the inner hoop and the outer hoop are concentrically arranged with the foundation pit, and the number of the inner hoop and the outer hoop is multiple and the inner hoop and the outer hoop are uniformly distributed along the axial direction; an inner pull bar and an outer pull bar are further arranged in the protection wall, the inner pull bar and the outer pull bar are connected with the inner hoop and the outer hoop respectively, the number of the inner pull bar and the outer pull bar is multiple and the inner pull bar and the outer pull bar are uniformly distributed along the circumferential direction, the top end and the bottom end of the inner pull bar and the outer pull bar are provided with a hook, and the hook of the inner pull bar and the outer pull bar is hooked on the inner hoop and the outer hoop respectively.

[0008] The application has the following beneficial effects:

[0009] 1. Compared with the prior art which does not arrange a hoop and a pull bar, or only arranges a hoop, or only arranges a pull bar, or only arranges one layer of a pull bar or a hoop, the application combines the synergistic effect of the inner hoop, the outer hoop, the inner pull bar and the outer pull bar, and significantly improves the overall performance of the protection wall. In actual construction, by adjusting the number and spacing of the hoop and the pull bar, the requirements under different geological conditions, such as soft soil foundation, expansive soil and frost heaving soil, can be flexibly met, and the applicability and reliability of the design scheme are enhanced.

[0010] 2. The inner hoop and the outer hoop are concentrically arranged with the foundation pit, so that the protection wall is uniformly stressed in the radial direction, local stress concentration is avoided, and the overall stability of the protection wall is enhanced. In addition, the multiple inner hoops and outer hoops are uniformly distributed along the axial direction, so that the stress balance of each part of the protection wall is further ensured, and deformation caused by uneven settlement or external load is prevented.

[0011] 3. The inner pull bar and the outer pull bar are connected with the inner hoop and the outer hoop respectively, so that a three-dimensional steel bar network is formed. This structure not only improves the shear capacity of the protection wall, but also effectively transfers and disperses the load, reduces the risk of local damage. The hooks arranged at the top end and the bottom end of the pull bar can firmly hook the hoop, increase the friction force and embedding effect between the steel bars, and further improve the shear strength.

[0012] 4. The multi-level arrangement of the inner hoop, the outer hoop, the inner pull bar and the outer pull bar makes the protection wall have stronger bearing capacity and can bear larger lateral soil pressure and water pressure.

[0013] Preferably, as an improvement, the inner hoop and the outer hoop are aligned in the horizontal direction.

[0014] Beneficial effects: The design of the inner hoop and the outer hoop being aligned in the horizontal direction significantly enhances the structural symmetry and uniformity of the retaining wall, ensuring balanced distribution of radial stress and avoiding local stress concentration, thereby improving the overall shear resistance and load-carrying capacity. It also optimizes the stress transmission path, allowing external loads to be evenly distributed throughout the retaining wall, enhancing structural stability.

[0015] Preferably, as an improvement, the inner and outer hoops are staggered.

[0016] Beneficial effects: The staggered arrangement effectively disperses stress concentration points, enhancing the overall shear resistance and structural stability of the retaining wall. Not only does it improve the synergy between steel bars and optimize load transmission paths, but it also better adapts to uneven settlement and changes in external loads, reducing the risk of local damage. In addition, the staggered arrangement increases the complexity and density of the steel bar network, further enhancing the strength and durability of the retaining wall, ensuring the reliable performance of the tower foundation protection structure under complex geological conditions.

[0017] Preferably, as an improvement, the hooks of the inner layer and the hooks of the outer layer are arranged back-to-back.

[0018] Beneficial effects: Back-to-back hooks increase the multidirectional constraints of the structure, improving the stability and durability of the retaining wall under complex stress conditions, ensuring the safety and reliability of the tower foundation protection structure.

[0019] Preferably, as an improvement, the retaining wall includes a top retaining wall and a stepped retaining wall connected sequentially below the top retaining wall, and the top retaining wall and the stepped retaining wall both have the hoop and the bar arranged inside.

[0020] Beneficial effects: The stepped retaining wall structure facilitates sequential construction as the foundation pit is excavated, allowing timely support for the excavated section.

[0021] Preferably, as an improvement, the top end of the stepped retaining wall is provided with a connecting groove, the bottom end of the stepped retaining wall is connected to the connecting groove of the next level of retaining wall, the bottom end of the top retaining wall is connected to the connecting groove of the topmost stepped retaining wall, and the inner wall of the stepped retaining wall is inclined with the bottom end facing outward from the foundation pit.

[0022] Beneficial effects: Through sequential nesting and inclined arrangement, the overall stability and anti-slippage ability of the retaining wall are significantly enhanced. The design of the connecting groove ensures the firm connection between the retaining walls of different levels, improving the overall structure and effectively transmitting and dispersing loads; the inclined arrangement of the inner wall increases the resistance to lateral earth pressure, reducing the risk of deformation caused by uneven stress distribution on the retaining wall.

[0023] Preferably, as an improvement, the thickness of the top retaining wall is uniform and greater than the thickness of the top end of the stepped retaining wall.

[0024] Beneficial effects: The greater thickness of the top wall provides stronger rigidity and compression resistance, effectively resisting larger lateral earth pressure and external loads on the top, reducing the risk of deformation and settlement. The uniform thickness distribution ensures balanced stress distribution in all parts of the wall, avoiding stress concentration and improving overall durability and reliability.

[0025] Preferably, as an improvement, the two adjacent reinforcing bars are provided with overlapping areas at the ends, and the length of the overlapping area is 400-500mm.

[0026] Beneficial effects: The overlapping area at the end of the reinforcing bar ensures effective stress transfer between the reinforcing bars, reducing stress concentration points and improving the shear resistance and load-bearing capacity of the structure. The length of the overlapping area is 400-500mm to achieve comprehensive effects. If the length is too large, the cost of the reinforcing bar will increase, and if the length is too small, the stress transfer effect and load-bearing capacity will be insufficient.

[0027] Preferably, as an improvement, the top end of the top wall is higher than the top of the foundation pit, and the length of the raised portion is 150-250mm.

[0028] Beneficial effects: By setting the top end of the top wall higher than the top of the foundation pit, it can effectively prevent surface water from flowing into the foundation pit, reducing the risk of erosion of the foundation pit slope by rainwater and surface runoff. The length of the raised portion is set to 150-250mm to achieve comprehensive effects. If the length is too large, the cost of the top wall will increase, and if the length is too small, the desired protection effect cannot be achieved.

[0029] Preferably, as an improvement, the length of the top wall and the stepped wall is the same.

[0030] Beneficial effects: It ensures the uniformity and consistency of the entire wall structure in the vertical direction, enhancing the overall stability and load-bearing capacity. The same length makes the connection between the levels of the wall more closely and smoothly, avoiding stress concentration and potential weak links caused by length differences. In addition, the uniform length simplifies the construction process, improves construction efficiency and accuracy, and facilitates standardized operation and quality control. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of the embodiment 1 of the present utility model.

[0032] Figure 2 is a sectional schematic diagram of the embodiment 1 of the present utility model.

[0033] Figure 3 is a partial structural schematic diagram of the reinforcing bar in the embodiment 1 of the present utility model.

[0034] Figure 4 is a partial structural schematic diagram of the reinforcing bar in the embodiment 2 of the present utility model. Detailed Implementation

[0035] The following detailed description illustrates the specific implementation method:

[0036] The reference numerals in the accompanying drawings of the instruction manual include: 1. Pit top retaining wall; 2. Graded retaining wall; 3. Connecting groove; 4. Inner ring stirrup; 5. Outer ring stirrup; 6. Outer ring tie bar; 7. Inner ring tie bar; 8. Hook; 9.

[0037] Example 1:

[0038] like Figure 1 As shown, a tower foundation protection structure includes a retaining wall cast into the inner wall of a foundation pit 1. The retaining wall comprises a pit top retaining wall 2 and multiple tiered retaining walls 3 sequentially connected below the pit top retaining wall 2. The connection between the pit top retaining wall 2 and the tiered retaining walls 3 is as follows: the top of each tiered retaining wall 3 has an L-shaped connecting groove 4 cast into it; the bottom of each tiered retaining wall 3 connects to the connecting groove 4 of the next lower-level retaining wall; and the bottom of the pit top retaining wall 2 connects to the connecting groove 4 of the uppermost tiered retaining wall 3. The inner wall of each tiered retaining wall 3 is inclined with its bottom facing outwards from the foundation pit 1, i.e., as shown... Figure 1 The inner wall of the graded retaining wall 3 shown is shaped like the number "8". The thickness of the pit top retaining wall 2 is uniform and greater than the thickness of the top of the graded retaining wall 3. The top of the pit top retaining wall 2 is higher than the top of the pit 1, and the length of the higher part is 150-250mm, preferably 200mm in this embodiment.

[0039] Combination Figure 2 and Figure 3 As shown, both the pit top retaining wall 2 and the graded retaining wall 3 are equipped with inner ring stirrups 5, outer ring stirrups 6, inner ring tie bars 8, and outer ring tie bars 7, and the arrangement is the same. Figure 3 Only the outer ring stirrups 6 and outer ring tie bars 7 are shown. The inner ring stirrups 5 and outer ring stirrups 6 are concentrically arranged with the foundation pit 1. There are multiple inner ring stirrups 5 and multiple outer ring stirrups 6, all evenly distributed along the axial direction of the foundation pit. The inner ring tie bars 8 and the outer ring tie bars 7 are welded to the inner ring stirrups 5 and the outer ring stirrups 6, respectively. There are multiple inner ring tie bars 8 and multiple outer ring tie bars 7, all evenly distributed along the circumference of the foundation pit, and the multiple inner ring tie bars 8 and multiple outer ring tie bars 7 are staggered. The top and bottom ends of the inner ring tie bars 8 and the outer ring tie bars 7 are bent with hooks 9, which are hooked onto the inner ring stirrups 5 and the outer ring stirrups 6, respectively. The bottom end of the tie rod in the pit top retaining wall 2 extends into the uppermost grade retaining wall 3, and the bottom end of the tie rod in the grade retaining wall 3 extends into the next grade retaining wall 3. That is, the ends of the two adjacent tie rods are provided with an overlapping area, the length of which is 400-500mm, and preferably 500mm in this embodiment.

[0040] In actual application, the retaining wall is poured and constructed step by step along with the excavation of the foundation pit 1, and the scheme effectively avoids local stress concentration of the retaining wall, ensures force balance of each part of the retaining wall, enhances overall stability of the retaining wall, and effectively prevents deformation caused by uneven settlement or external load through the synergistic effect of the inner hoop 5, the outer hoop 6, the inner tie 8 and the outer tie 7.

[0041] Embodiment 2:

[0042] In combination Figure 4 As shown in the drawings, the difference between the embodiment and embodiment 1 is that the inner hoop 5 and the outer hoop 6 are aligned in the horizontal direction, and the hooks 9 of the inner tie 8 and the hooks 9 of the outer tie 7 are arranged back to back. The embodiment can further enhance the structural symmetry and uniformity of the retaining wall, ensure force balance of the foundation pit, avoid local stress concentration, and thus improve the overall shear resistance and carrying capacity.

[0043] Embodiment 3:

[0044] The difference between the embodiment and embodiment 1 is that the lengths of the top retaining wall 2 and the stepped retaining wall 3 are the same, and the embodiment can improve the uniformity and consistency of the overall retaining wall structure in the vertical direction, and enhance the stability and carrying capacity of the overall retaining wall.

[0045] The above is only an embodiment of the present application, and well-known specific technical solutions and / or characteristics in the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical scheme of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A tower foundation protection structure comprising a shield wall provided on an inner wall of a foundation pit, characterized in that: The inner and outer hoop reinforcement are arranged concentrically with the foundation pit, and the number of the inner and outer hoop reinforcement is multiple and uniformly distributed along the axial direction.

2. A tower foundation protection structure according to claim 1, characterised in that: The inner and outer hoop reinforcement are aligned in the horizontal direction.

3. A tower foundation protection structure according to claim 2, wherein: The inner and outer pull reinforcement are arranged staggered.

4. A tower foundation protection structure according to claim 3, wherein: The hooks of the inner and outer pull reinforcement are arranged back to back.

5. A tower foundation protection structure according to claim 4, wherein: The retaining wall comprises a top retaining wall and graded retaining walls connected in turn below the top retaining wall, and the hoop reinforcement and pull reinforcement are arranged in the top retaining wall and graded retaining walls.

6. A tower foundation protection structure according to claim 5, wherein: The top end of the graded retaining wall is provided with a connecting groove, the bottom end of the graded retaining wall is connected in the connecting groove of the next level retaining wall, the bottom end of the top retaining wall is connected in the connecting groove of the topmost graded retaining wall, and the inner wall of the graded retaining wall is arranged in a way that the bottom end faces outward of the foundation pit.

7. A tower foundation protection structure according to claim 6, wherein: The thickness of the top retaining wall is uniform and greater than the thickness of the top end of the graded retaining wall.

8. A tower foundation protection structure according to claim 7, wherein: The end of the upper and lower adjacent pull reinforcement is provided with an overlapping area, and the length of the overlapping area is 400-500mm.

9. A tower foundation protection structure according to claim 8, wherein: The top end of the top retaining wall is higher than the top of the foundation pit, and the length of the raised part is 150-250mm.

10. A tower foundation protection structure according to claim 9, wherein: The length of the top retaining wall and the graded retaining wall is the same.

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