Road slope supporting construction process and supporting structure based on electric tower protection

Abstract

The invention discloses a road slope supporting construction process and supporting structure based on electric tower protection. The road slope supporting construction process comprises the steps that S1, temporary earthwork backfilling is conducted; s2, constructing a temporary support system; s3, temporary opposite-pull anchoring is applied; s4, permanent support row piles are constructed; s5, constructing a top connecting system; s6, constructing a side slope opposite-pulling support system; s7, excavation and supporting are completed; and S8, the temporary structure is dismantled. Relates to the technical field of slope supporting, through two-stage conversion of a temporary opposite-pulling system and a permanent opposite-pulling frame, an anchor cable of a first construction slope cannot lose efficacy due to exposure of subsequent excavation, an anchor cable can also be normally arranged on a later construction slope, the slopes on the two sides are anchored mutually, and the overall stability of a mountain is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of slope protection technology, and in particular to a road slope protection construction process and support structure based on power tower protection. Background Technology

[0002] When constructing engineering projects (such as roads and residential areas) in mountainous or hilly areas, it is often necessary to excavate natural hillsides to create artificial slopes. To ensure the stability of the excavated slope, anchor cable (or anchor rod) support technology is commonly used to reinforce one side of the hillside, forming a pile retaining wall. This support method has been widely used and proven effective in practice. However, in certain situations, when subsequent planning in the area requires new excavation work on the other side of the hillside, roughly parallel to the already supported slope, such as building another road, new technical challenges arise.

[0003] Subsequent excavation of a new slope on the parallel side will significantly disturb the internal stress state of the mountain, inevitably causing the ends of the existing anchor cables on the slope, i.e., the side closest to the new excavation face, to gradually become exposed or lose effective coverage. This not only directly weakens the anchoring force of the original anchor cables, leading to a significant decrease in their support effectiveness or even failure, endangering the stability of the original slope; at the same time, because the newly excavated slope is adjacent to the original anchor cable arrangement area, it is also difficult to safely and effectively implement new anchor cable support (drilling, grouting, tensioning, and other operations may directly damage or interfere with the original anchor cable structure, or fail to obtain sufficient anchoring length). In addition, when there are important facilities such as high-voltage transmission towers (electric towers) on the mountain that are extremely sensitive to foundation deformation, this situation of overlapping disturbances from excavation on both sides and mutual interference between support structures will seriously threaten the overall strength and stability of the mountain, thus posing a significant risk to the safe operation of the power towers.

[0004] In summary, existing technologies have significant drawbacks when dealing with the situation of sequential excavation and support of slopes on both sides of a parallel mountain: the excavation of the later-constructed slope impairs the anchor cable support effect of the earlier-constructed slope, while the existing anchor cables severely restrict the effective support of the later-constructed slope. This mutual constraint and weakening phenomenon makes it impossible to reliably guarantee the stability of both slopes, especially on mountains involving the protection of critical facilities such as power towers, greatly increasing the possibility of engineering risks and safety accidents. Therefore, there is an urgent need to develop a new slope structure or construction method that can effectively solve the problems of anchor cable interference, reduced support efficiency, and decreased overall mountain stability when sequentially supporting slopes on both sides. Summary of the Invention

[0005] In order to improve the problems of anchor cable interference, reduced support efficiency and decreased overall stability of the mountain when supporting slopes on both sides in succession, this application provides a road slope support construction technology and support structure based on power tower protection.

[0006] Firstly, this application provides a road slope protection construction process based on power tower protection, employing the following technical solution: A road slope protection construction process based on power tower protection includes the following steps: S1: Temporary earthwork backfilling: Temporary earthwork backfilling is carried out in the planned new slope area until the backfill surface reaches the elevation of the top of the existing pile retaining wall; S2: Temporary support system for construction: construct temporary piles on the outside of the planned new road slope, and construct a capping beam on top of the temporary piles. Construct a reinforced capping beam on the top of the existing capping beam of the existing pile retaining wall. S3: Apply temporary tension anchorage: Construct prestressed anchor rods between the capping beam at the top of the temporary pile wall and the reinforced capping beam at the top of the existing pile retaining wall, and tension and lock them to form a temporary tension support system. S4: Construction of permanent support piles: Construction of permanent piles on the inner side of the slope of the planned new road; S5: Construct a top connection system: Construct a capping beam on top of the permanent pile wall, and construct multiple tie beams between the reinforcing capping beam on top of the existing pile retaining wall and the capping beam on top of the permanent pile wall; S6: Construct a slope tie support system: excavate temporary backfill soil and mountain soil in layers from top to bottom, and construct the panel and waist beam between the permanent piles in sequence according to the excavation depth, and construct the waist beam on the surface of the existing pile retaining wall; then, construct tie anchor cables between the waist beams at the corresponding elevations, so that the existing pile retaining wall and the permanent piles are anchored to each other through tie anchor cables. S7: Complete excavation and support: Continue excavating the remaining earthwork to the road design elevation and complete the construction of the remaining pile-to-pile panels; S8: Demolition of temporary structures: Temporary pile breaking. After the earthwork is excavated to the road surface elevation, temporary pile breaking work is carried out to a predetermined depth below the road surface elevation.

[0007] By adopting the above technical solution, a temporary tie-support system can be constructed to ensure the safety of the existing pile retaining wall through a phased construction method of temporary support first and permanent support following. Subsequently, the top tie beam and tie anchor cable form an overall coordinated force-bearing structure, which solves the problem of mutual interference between the sequential construction of parallel slopes and ensures the stability of the slope and the safety of the power tower.

[0008] Optionally, in step S2, when constructing the reinforcing cap beam of the existing pile retaining wall, a rough surface is first chiseled out on the top of the old cap beam and reinforcement bars are installed, and then concrete is poured to form the reinforcing cap beam, with the end of the reinforcing cap beam extending downward and wrapping around and hooking onto the outer surface of the old cap beam.

[0009] By adopting the above technical solutions, the interface bonding strength and connection reliability between the reinforced cap beam and the old cap beam can be enhanced, ensuring that the temporary tension anchorage and subsequent forces are effectively transferred to the main body of the existing pile retaining wall, and avoiding the risk of support system failure caused by connection failure.

[0010] Optionally, in step S4, the construction of permanent piles is carried out by manual excavation; in step S2, temporary piles are added inside the planned location of the permanent piles for pre-support; before the construction in step S5, the earthwork is excavated to the starting elevation of the manual excavation operation, and then the manual excavation and concrete pouring of the permanent piles are carried out; after the pile concrete reaches the required strength, the upper section of the pile body and the pile top cap beam are constructed upwards by formwork pouring.

[0011] By adopting the above technical solution, a solution is provided for the safety issues faced by the specific construction method of manual excavation for permanent pile C, such as the inability to carry out mechanical excavation due to power lines on high-voltage towers. A row of piles is pre-installed on the inner side of permanent pile C to retain soil, providing a stable pit wall environment for subsequent manual excavation operations and ensuring construction safety.

[0012] Secondly, this application provides a road slope protection structure based on power tower protection, which is constructed using the above-mentioned process and includes a permanent pile retaining wall, a tie beam system, and a tie anchor system. The top of the existing pile retaining wall is provided with a reinforcing cap beam. The top of the permanent pile retaining wall is provided with a cap beam. The tie beam system includes multiple reinforced concrete tie beams connecting the reinforcing cap beam and the cap beam of the permanent pile retaining wall. The tie anchor system includes multiple sets of tie anchors distributed along the slope height direction, with multiple anchors of each set of tie anchors respectively tied between the waist beam fixed to the existing pile retaining wall and the waist beam fixed to the permanent pile retaining wall.

[0013] By adopting the above technical solution, a collaborative load-bearing structure of permanent piles and existing pile retaining walls was constructed. The top tie beam and layered tie anchors were used to achieve load balance on both sides of the slope, avoid mutual interference between the support structures, and improve the overall stability of the mountain to meet the protection requirements of power towers.

[0014] Optionally, the end of the reinforced cap beam is formed with a reinforcing head that extends downward and wraps around the original old cap beam of the existing pile retaining wall.

[0015] By adopting the above technical solutions and through the design of the reinforcement head, the connection strength and force transmission efficiency between the reinforced crown beam and the old crown beam are greatly improved, avoiding separation or damage under stress, and providing a reliable load-bearing foundation for the support system.

[0016] Optionally, the support structure further includes a temporary pile bank, which is vertically fixed to the side of the permanent pile bank facing the existing pile retaining wall.

[0017] By adopting the above technical solution, temporary pile foundations can provide lateral support during the construction phase, ensuring the stability of permanent pile foundation construction.

[0018] In summary, this application has the following beneficial effects: Through a two-stage conversion of "temporary tie system + permanent tie frame", the anchor cables of the slope constructed first will not fail due to subsequent excavation and exposure, and the anchor cables of the slope constructed later can also be set normally. The two slopes are mutually anchored, and the overall rigidity of the mountain is significantly improved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall steps in Embodiment 1; Figure 2 This is a cross-sectional view of the entire embodiment 1; Figure 3 This is an overall sectional view of embodiment 2; Figure 4 This is a plan view of the tie beam in Embodiment 2.

[0020] Explanation of reference numerals in the attached drawings: 1. Existing pile retaining wall; 2. Temporary pile one; 3. Reinforced capping beam; 5. Anchor bolt; 6. Permanent pile; 7. Temporary pile two; 8. Tie beam; 9. Waist beam; 10. Tie anchor cable; 11. High-voltage transmission tower. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the accompanying drawings.

[0022] Example 1: Example 1 discloses a road slope support construction process based on power tower protection, which aims to solve the technical problems that when slopes are excavated and supported on both sides of a parallel mountain, the excavation of the later slope damages the anchor cable support effect of the earlier slope, and the existing anchor cables restrict the effective support of the later slope. It is especially suitable for protection scenarios where there are high-voltage power transmission towers and other facilities on the mountain that are sensitive to foundation deformation.

[0023] Reference Figure 1 , 2 The construction process specifically includes the following steps: S1: Temporary earthwork backfilling In the mountain area corresponding to the planned new road slope excavation, the site was first cleared, removing surface soil, weeds, and obstacles. Then, temporary backfilling was carried out using a layered backfilling method, with each layer compacted using a road roller or tamping machine, ensuring a compaction degree of no less than 94%. Backfilling continued until the backfill surface was level with the top of the existing pile retaining wall 1, forming a temporary bearing surface and providing a stable working platform for subsequent temporary support system construction.

[0024] S2: Temporary construction support system On the backfilled and compacted work platform, a row of temporary piles (2) is constructed along the outer edge of the planned new road. Temporary piles (2) can be constructed using methods such as mechanically drilled cast-in-place piles. A reinforced concrete cap beam is then poured on-site at the top of this row of temporary piles (2), connecting all the temporary piles (2) into a continuous temporary retaining wall.

[0025] Simultaneously, the existing capping beam atop the constructed pile retaining wall 1 was reinforced. During the construction of the reinforced capping beam 3, the top surface and sides requiring bonding of the old capping beam were first roughened to expose a solid, rough base layer. Then, holes were drilled at the designed spacing, cleaned, and reinforcing bars were inserted. Finally, the reinforcing steel frame of the reinforced capping beam 3 was tied, formwork was erected, and high-strength concrete was poured to form the reinforced capping beam 3, which wraps around and hooks the old capping beam. This reinforced capping beam 3 not only enhances the rigidity and strength of the old capping beam but, more importantly, provides a reliable load-bearing connection point for subsequent steps.

[0026] S3: Apply temporary tension anchorage Between the capping beam at the top of the temporary pile 2 and the reinforcing capping beam 3 at the top of the existing pile retaining wall 1, prestressed anchor rods 5 are installed horizontally or at a small angle. After drilling, installation, and grouting of the anchor rods 5, they are tensioned according to design requirements and immediately locked onto the capping beams on both sides. The exposed sections of the anchor rods 5 are protected against corrosion by painting, applying anti-corrosion lubricating oil, and using plastic pipes, which can be made of high-density polyethylene or polypropylene. These tensioned prestressed anchor rods 5 form a strong horizontal constraint between the two structures, constituting a temporary tension support system. Before the permanent support structure takes effect, this system actively undertakes the key role of resisting the lateral pressure of the mountain and effectively controls the possible deformation of the existing slope.

[0027] S4: Construction of permanent support piles On the inner side of the planned new road slope, a permanent support structure, permanent pile 6, will be constructed. Depending on site conditions, such as proximity to high-voltage lines where large machinery cannot operate, this step can be done by manual excavation. To ensure the elevation requirements for manual excavation, in step S2, a row of temporary piles 7 can be pre-constructed further inside the planned line of permanent pile 6, i.e., in the direction of the mountain, to retain soil and provide a safe pit wall environment for manual excavation. Then, the earthwork will be excavated to the planned starting elevation of the manually excavated piles, followed by manual excavation, placement of the reinforcing cage, and concrete pouring to form the lower pile body of permanent pile 6.

[0028] S5: Constructing a Top-Level Connection System After the concrete of the lower pile body of the permanent pile 6 reaches a certain strength, the upper pile section is constructed upward by formwork pouring until the designed pile top elevation, and the capping beam at the top of the permanent pile 6 is poured simultaneously.

[0029] Next, between the reinforced capping beam 3 of the existing pile retaining wall 1 and the capping beam of the permanent pile 6, several parallel reinforced concrete tie beams 8 are constructed. The connection nodes between the tie beams 8 and the reinforced capping beam 3 are typically constructed using monolithic reinforced concrete casting. These tie beams 8 form a rigid connection at the top of the two permanent support structures, constituting a top connection system that coordinates the load-bearing load, connecting the two slopes at the top into a unified whole, and coordinating deformation and stress.

[0030] S6: Construct a slope tie-support system The excavation of the temporary backfill soil and the original mountain soil in S1 will begin from top to bottom, in layers and sections. Excavation will be paused at each certain depth, corresponding to the elevation of the anchor cable 10 in the design, and support work will be carried out promptly. Construct permanent panels, such as wire mesh shotcrete or precast slabs, between the permanent piles 6, and a lintel 9 at that elevation.

[0031] On the corresponding elevation surface of the existing pile retaining wall 1, a wainscoting 9 is also constructed, which can be fixed to the original retaining wall surface by means of rebar installation, concrete pouring, etc.

[0032] Between the lintels 9 at the same elevation, located on two separate support structures, horizontal tie anchors 10 are installed. After the tie anchors 10 are installed, grouted, and reach their strength, they are tensioned and locked. This process is repeated, with multiple tie anchors 10 installed layer by layer as the excavation depth increases. These tie anchors 10 form a slope tie support system, tightly connecting the existing pile retaining wall 1 with the newly built permanent piles 6, jointly resisting the deep soil pressure.

[0033] S7: Complete excavation and support Continue excavating the remaining soil downwards until the design roadbed elevation of the new road is reached. Simultaneously complete the construction of the pile-to-slab panel in the lowest section, as well as necessary drainage, waterproofing, and other ancillary works in this area.

[0034] S8: Dismantle the temporary structure When the excavation reaches the construction elevation of the road surface structure layer, the temporary piles 2, which no longer serve a supporting function and affect road construction, are demolished. Demolition continues to a predetermined depth below the road surface elevation; in this embodiment, the predetermined depth is 1 meter. At this point, all temporary structures have been removed, and the permanent support structure is fully operational.

[0035] Example 2: This embodiment 2 presents a road slope protection structure based on power tower protection, which is a permanent slope protection structure formed by the process described in embodiment 1.

[0036] Reference Figure 3 , 4The support structure includes a permanent pile system 6, a tie beam system 8, and a tie anchor cable system 10. The permanent pile system 6 is made of reinforced concrete cast-in-place piles and is arranged longitudinally along the inner side of the new road slope. A reinforced concrete capping beam is set on the top of the piles, and the capping beam is integrally connected with the main reinforcement of the permanent pile system 6 to form an integral frame.

[0037] A reinforcing cap beam 3 is installed at the top of the existing pile retaining wall 1. The end of the reinforcing cap beam 3 forms a reinforcing head that extends downward. The reinforcing head wraps around the original old cap beam of the existing pile retaining wall 1. Rebars connected to the old cap beam are installed inside the reinforcing cap beam 3 to ensure a reliable connection between the two.

[0038] The tie beam system comprises several tie beams 8 fixedly connected between the reinforced capping beam 3 and the capping beam of the permanent pile 6. The tie beams 8 can be fixedly connected to the capping beams of the reinforced capping beam 3 and the permanent pile 6 by casting reinforced concrete. These tie beams 8 are arranged approximately horizontally in space, rigidly connecting the support structures on both sides of the mountain top, forming a strong top horizontal frame that effectively constrains the relative displacement and rotation of the structures on both sides.

[0039] The tie anchor cable 10 system includes multiple sets of tie anchor cables 10 distributed along the slope height direction. The multiple anchor cables of each set of tie anchor cables 10 are respectively tied between the waist beam 9 fixed on the existing pile retaining wall 1 and the waist beam 9 fixed on the permanent pile 6.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A road slope protection construction technology based on power tower protection, characterized in that: Includes the following steps: S1: Temporary earthwork backfilling: Temporary earthwork backfilling shall be carried out in the planned new slope area until the backfill surface reaches the elevation of the top of the existing pile retaining wall (1); S2: Temporary support system for construction: Temporary piles (2) are constructed on the outside of the planned new road slope, and a capping beam is constructed on the top of the temporary piles (2). A reinforced capping beam (3) is constructed on the top of the old capping beam of the existing pile retaining wall (1). S3: Apply temporary tension anchoring: construct prestressed anchors (5) between the capping beam at the top of the temporary pile 1 (2) and the reinforcing capping beam (3) at the top of the existing pile retaining wall (1), and tension and lock them to form a temporary tension support system; S4: Construction of permanent support piles: Construction of permanent piles (6) on the inner side of the planned new road slope. S5: Construct a top connection system: Construct a capping beam on top of the permanent pile (6), and construct multiple tie beams (8) between the reinforcing capping beam (3) on top of the existing pile retaining wall (1) and the capping beam on top of the permanent pile (6). S6: Construct a slope tie support system: excavate temporary backfill soil and mountain soil in layers from top to bottom, and construct panels and waist beams (9) between permanent piles (6) in sequence according to the excavation depth, and construct waist beams (9) on the surface of the existing pile retaining wall (1); then, construct tie anchors (10) between the waist beams (9) at the corresponding elevations, so that the existing pile retaining wall (1) and the permanent piles (6) are anchored to each other through tie anchors (10); S7: Complete excavation and support: Continue excavating the remaining earthwork to the road design elevation and complete the construction of the remaining pile-to-pile panels; S8: Demolition of temporary structures: Temporary pile breaking. After the earthwork is excavated to the road surface elevation, temporary pile breaking work is carried out to a predetermined depth below the road surface elevation.

2. The road slope protection construction technology based on power tower protection according to claim 1, characterized in that: In step S2, when constructing the reinforced cap beam (3) of the existing pile retaining wall (1), a rough surface is first chiseled out on the top of the old cap beam and reinforcement bars are installed, and then concrete is poured to form the reinforced cap beam (3). The end of the reinforced cap beam (3) extends downward and wraps around and hooks onto the outer surface of the old cap beam.

3. The road slope protection construction technology based on power tower protection according to claim 1, characterized in that: In step S4, the permanent piles (6) are constructed using manual excavation. In step S2, temporary piles (7) are added inside the planned location of the permanent piles (6) for pre-support. Before construction in step S5, the earthwork is excavated to the starting elevation of the manual excavation operation, and then the manual excavation and concrete pouring of the permanent piles (6) are carried out. After the concrete of the pile body reaches the required strength, the upper section of the pile body and the pile top cap beam are constructed upwards using the formwork pouring method.

4. A road slope protection structure based on power tower protection, comprising the road slope protection construction process based on power tower protection as described in any one of claims 1-3, characterized in that: It includes a permanent pile (6), a tie beam (8) system, and a tie anchor cable (10) system; The top of the existing pile retaining wall (1) is provided with a reinforcing cap beam (3); The top of the permanent pile (6) is provided with a cap beam; The tie beam (8) system includes multiple reinforced concrete tie beams (8) connecting the reinforced cap beam (3) and the permanent pile (6). The tie anchor cable (10) system includes multiple sets of tie anchor cables (10) distributed along the slope height direction. The multiple anchor cables of each set of tie anchor cables (10) are respectively tied between the waist beam (9) fixed on the existing pile retaining wall (1) and the waist beam (9) fixed on the permanent pile (6).

5. A road slope protection structure based on power tower protection according to claim 4, characterized in that: The end of the reinforced cap beam (3) has a reinforced head that extends downward and wraps around the original old cap beam of the existing pile retaining wall (1).

6. A road slope protection structure based on power tower protection according to claim 4, characterized in that: The support structure also includes a temporary pile group (2), which is vertically fixed to the side of the permanent pile group (6) facing the existing pile retaining wall (1).

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