High and steep slope pipeline backfilling combined type anti-sliding anchoring structure and construction method thereof

Abstract

The invention discloses a high and steep slope pipeline backfill combined type anti-sliding anchoring structure and a construction method thereof, and the structure comprises a concrete protection layer which is poured on pipe ditch backfill soil of a high and steep slope and is arranged along the slope forming direction of the high and steep slope; the supporting frames are installed on the concrete protection layer, the multiple supporting frames are arranged at intervals in the length direction of the concrete protection layer, and a limiting space is formed between every two adjacent supporting frames; the vegetation bags are laid in the limiting space, and vegetation seeds, planting soil and fertilizer are poured into the vegetation bags; the geonet covers the vegetation bag; the anchoring rope net is pressed against the geonet and comprises a plurality of transverse ropes and a plurality of longitudinal ropes, the transverse ropes and the longitudinal ropes are arranged in a crisscross mode, and the two ends of the transverse ropes and the two ends of the longitudinal ropes are fixedly arranged on the high and steep slope through ground anchors respectively. The problem that an existing high and steep pipeline backfilling technology cannot meet three core requirements of structural stability, scouring resistance and ecological restoration at the same time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to a composite anti-sliding anchoring structure for pipeline backfilling on high-steep slopes and a construction method thereof. Background Art

[0002] When backfilling pipelines on high-steep slopes, it is necessary to simultaneously meet three core requirements: structural stability, anti-scouring property, and ecological restoration. However, traditional technologies are difficult to meet multiple requirements simultaneously:

[0003] 1. Conventional earthwork backfilling: The slope is too steep to be mechanically compacted, and problems such as landslides of pipelines and backfill soil layers are likely to occur.

[0004] 2. Concrete and lime soil backfilling: The rigid structure blocks the water and gas exchange, making it difficult for vegetation to survive.

[0005] 3. Single ecological slope protection: The vegetation bags / three-dimensional meshes have no rigid anchoring, and the anti-slip coefficient is only 1.0 - 1.2. After being scoured by heavy rain, the local collapse rate is > 30%.

[0006] Therefore, it is urgent to develop a composite anti-sliding anchoring structure for pipeline backfilling on high-steep slopes that can simultaneously meet the three core requirements of structural stability, anti-scouring property, and ecological restoration. Summary of the Invention

[0007] To overcome the defects of the existing technology, the present invention provides a composite anti-sliding anchoring structure for pipeline backfilling on high-steep slopes and a construction method thereof, so as to solve the problem that the existing high-steep pipeline backfilling technology cannot simultaneously meet the three core requirements of structural stability, anti-scouring property, and ecological restoration.

[0008] To achieve the above object, the present invention provides a composite anti-sliding anchoring structure for pipeline backfilling on high-steep slopes, including:

[0009] A concrete protective layer, which is poured on the backfill soil of the pipeline trench on the high-steep slope, and the concrete protective layer is arranged along the slope direction of the high-steep slope;

[0010] A plurality of support frames, which are installed on the concrete protective layer, and the plurality of support frames are arranged at intervals along the length direction of the concrete protective layer, and a limiting space is formed between two adjacent support frames;

[0011] Vegetation bags, which are laid in the limiting space, and the vegetation bags are filled with vegetation seeds, planting soil, and fertilizers;

[0012] Geotextile mesh, which covers the vegetation bags;

[0013] An anchoring rope net that presses against the geotextile mesh, and the anchoring rope net includes a plurality of transverse ropes and a plurality of longitudinal ropes that are arranged in a crisscross manner. The two ends of the transverse ropes and the two ends of the longitudinal ropes are respectively fixed to the high-steep slope through anchor nails.

[0014] Furthermore, the thickness of the concrete protective layer is 10 cm.

[0015] Furthermore, the support frame includes a ground beam, the ground beam is laid on the concrete protective layer, the ground beam is connected with anchor rods, the anchor rods are buried in the concrete protective layer, and multiple retaining rods are vertically arranged on the ground beam.

[0016] Furthermore, a tie beam is connected between the ground beams of two adjacent support frames.

[0017] Furthermore, the vertically arranged support frame is an FRP resin support frame.

[0018] Furthermore, the middle parts of the transverse rope and the longitudinal rope are connected to the retaining rods.

[0019] Furthermore, an inclination sensor is installed on the ground beam.

[0020] The present invention provides a construction method for a composite anti-slide anchoring structure for pipeline backfilling on a high-steep slope, including the following steps:

[0021] After the pipeline is laid on the high-steep slope, backfill soil is filled in the trench of the high-steep slope, and the backfill soil covers the pipeline;

[0022] A concrete protective layer is poured on the backfill soil, and the concrete protective layer is arranged along the slope direction of the high-steep slope;

[0023] After the concrete protective layer begins to set, multiple support frames are installed on the concrete protective layer, so that the multiple support frames are arranged at intervals along the length direction of the concrete protective layer, and a limiting space is formed between two adjacent support frames;

[0024] Planting bags are laid in the limiting space;

[0025] A geotextile net is covered on the planting bags;

[0026] The geotextile net is pressed against the anchor rope net, and the two ends of the transverse rope and the two ends of the longitudinal rope of the anchor rope net are respectively fixed on the high-steep slope through anchor nails.

[0027] The beneficial effects of the present invention are as follows. The high-steep slope pipeline backfill composite anti-slide anchoring structure of the present invention can effectively ensure the stability of the pipeline and the backfill layer, and the growth of the vegetation in the greening layer will also be guaranteed, reducing the adverse effects of rainwater scouring on the pipeline, the backfill layer and the greening vegetation. The high-steep slope pipeline backfill composite anti-slide anchoring structure of the present invention is provided with a concrete protective layer to ensure the stability of the pipeline. The support frame and the geonet and ropes on the surface are fixed to ensure the stability of the vegetation planting bags. The use of the vegetation planting bags can realize the planting of greening vegetation, achieving the purpose of stable backfill and vegetation growth. The high-steep slope pipeline backfill composite anti-slide anchoring structure of the present invention has good anti-scouring performance and is economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present application will become more apparent:

[0029] Figure 1 It is a schematic structural diagram of the high-steep slope pipeline backfill composite anti-slide anchoring structure of the embodiment of the present invention.

[0030] Figure 2 It is a top view of the high-steep slope pipeline backfill composite anti-slide anchoring structure of the embodiment of the present invention.

[0031] Figure 3 It is a schematic structural diagram of the support frame of the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further describes the present application in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. In addition, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0033] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0034] Referring to Figures 1 to 3 as shown, the present invention provides a high-steep slope pipeline backfill composite anti-slide anchoring structure, including: a concrete protective layer 1, a support frame 2, a vegetation planting bag 3, a geonet 4 and an anchoring rope net.

[0035] Among them, the concrete protective layer 1 is poured on the trench backfill soil of the high-steep slope. The concrete protective layer 1 is arranged along the slope direction of the high-steep slope.

[0036] As a preferred embodiment, the thickness of the concrete protective layer 1 is 10 cm.

[0037] There are multiple support frames 2. The support frames 2 are installed on the concrete protective layer 1. The multiple support frames 2 are arranged at intervals along the length direction of the concrete protective layer 1. A limiting space is formed between two adjacent support frames 2.

[0038] As a preferred embodiment, the support frame 2 includes a ground beam 21, an anchor rod 22, and a retaining rod 23. The ground beam 21 is laid on the concrete protective layer 1. The ground beam 21 is connected with the anchor rod 22. The anchor rod 22 is buried in the concrete protective layer 1. Multiple retaining rods 23 are vertically arranged on the ground beam 21.

[0039] In this embodiment, a connecting beam is connected between the ground beams 21 of two adjacent support frames 2. An inclination sensor is installed on the ground beam 21.

[0040] Preferably, the vertically arranged support frame 2 is an FRP resin support frame 2.

[0041] The FRP resin support frame has the characteristics of light weight, high strength, corrosion resistance, and easy processing. The long side of the support frame is the same as the width of the trench backfill, and the width is 30 cm. Among them, the depth of the anchor rod of the support frame inserted into the concrete protective layer is 10 cm, and the retaining rod exposes 20 cm above the concrete surface.

[0042] The vegetation bags 3 are laid in the limiting space. The vegetation bags 3 are filled with vegetation seeds, planting soil, and fertilizers.

[0043] The geogrid 4 covers the vegetation bags 3.

[0044] An anchoring rope net pressing against the geogrid 4. The anchoring rope net includes multiple transverse ropes 71 and multiple longitudinal ropes 72 arranged in a crisscross manner. The two ends of the transverse ropes and the two ends of the longitudinal ropes are respectively fixed to the high and steep slope through anchor nails 6.

[0045] The middle parts of the transverse ropes and the longitudinal ropes are connected to the retaining rods 23.

[0046] The present invention provides a construction method for a high and steep slope pipeline backfill composite anti-sliding anchoring structure, including the following steps:

[0047] S1. After the pipeline 5 on the high and steep slope is laid, backfill soil is filled in the trench of the high and steep slope, and the backfill soil covers the pipeline 5.

[0048] First, complete the installation and fixation of the pipeline in the trench of the high and steep slope according to the design requirements. Then, fill the trench of the high and steep slope with backfill soil.

[0049] S2. Pour a concrete protective layer 1 on the backfill soil, and the concrete protective layer 1 is arranged along the slope direction of the high and steep slope.

[0050] When pouring the concrete protective layer 1, the concrete is poured from top to bottom and vibrated. During the vibration process, avoid hitting the pipeline and fixed buckles with the vibrator. After pouring, level the surface and cure it in time.

[0051] S3. After the concrete protective layer 1 begins to set, install multiple support frames 2 on the concrete protective layer 1, such that the multiple support frames 2 are arranged at intervals along the length direction of the concrete protective layer 1, and a limiting space is formed between two adjacent support frames 2.

[0052] Before pouring the concrete of the concrete protective layer, fabricate the support frames, and drive short steel bars as control line auxiliary piles for installing the support frames every 60 cm along the slope surface starting from 10 cm away from the bottom of the slope on both sides outside the pipeline backfill width. After the concrete begins to set, pull a line from the two-side auxiliary piles for positioning the installation of the support frames. Insert the anchor rods of the support frames 10 cm into the concrete layer, and use steel bars, wooden poles, etc. as inclined braces to temporarily support the support frames by binding according to the situation. After the support frames are stable, remove the inclined braces.

[0053] S4. Lay vegetation bags 3 in the limiting space.

[0054] Mix the vegetation seeds of the greening layer, planting soil, fertilizer, etc. in accordance with the proportion required by the design in advance. After mixing is completed, load them into the vegetation bags. The loading amount of the vegetation bags should be such that it can reach a thickness of 20 cm after being placed on the support frames. After the concrete strength of the concrete protective layer above the pipeline reaches 75%, place the vegetation bags on the support frames, and the surface should be spread flat to avoid undulations.

[0055] S5. Cover the vegetation bags 3 with a geogrid 4.

[0056] After the vegetation bags are placed, lay the three-dimensional geogrid in time. Leave 80 cm at the top and bottom of the slope. Bury 30 cm wide at the upper end into the soil, and leave the lower end as a horizontal plane. Place the net at the top of the slope, and then pull out the net pad along the slope from top to bottom to the foot of the slope. The overlap between the nets should be not less than 10 cm, and the net should be closely attached to the slope surface without suspended wrinkles.

[0057] S6. Press and anchor the geogrid 4 with an anchor rope net, and respectively fix the two ends of the transverse ropes and the two ends of the longitudinal ropes of the anchor rope net to the high-steep slope through anchor nails.

[0058] After the three-dimensional geogrid is laid, drive a row of anchor nails along the slope direction at 40 cm away from the ends at the top and bottom of the slope and at 30 cm away from the two side lines of the pipeline backfill width. The anchor nails are made of HRB400 steel bars with a diameter of 12 mm, and the length of the anchor nails is 60 cm, of which 50 cm is driven into the soil layer and 10 cm is exposed for binding the ropes. The spacing of the anchor nails at the top and bottom of the slope is 60 cm, and the spacing of the anchor nails on the slope surface is 120 cm.

[0059] Along the slope direction, ropes are tied every 60 cm starting from 10 cm away from the backfill side line within the backfill range of the slope surface pipelines through the fixed ends of the support frames. Outside the side lines of the pipeline backfill width on both sides, a rope is pulled from the top of the slope to the top of the slope at 30 cm away from the backfill side line and fixed at the anchor bolts. Along the cross-slope direction, ropes are pulled at 40 cm away from the ends at the top and bottom of the slope and fixed at the anchor bolts. On the slope surface, ropes are pulled every 60 cm starting from 10 cm away from the bottom of the slope and tied and fixed at the anchor bolts and the fixed ends of the support frames. The ropes should be tightened and straightened, and closely attached to the three-dimensional geogrid.

[0060] The concrete-FRP support frame synergy of the composite anti-slip anchoring structure for pipeline backfill on high-steep slopes of the present invention: Pour 10 cm thick C25 concrete on the top of the pipeline to form a rigid protective layer (compressive strength ≥ 25 MPa). Through the synergy of the concrete covering layer and the FRP resin support frame (tensile strength ≥ 300 MPa), a composite anti-slip system of "rigid base + flexible anchoring" is constructed. The anchor rods of the support frame are inserted 10 cm deep into the concrete layer and exposed 20 cm, forming a double anchoring interface (concrete bond strength ≥ 0.8 MPa + FRP angle steel pull-out resistance ≥ 15 kN / m), and the anti-slip ability is increased by more than 3 times compared with the traditional backfill method.

[0061] The composite anti-slip anchoring structure for pipeline backfill on high-steep slopes of the present invention transfers the load of the vegetation bags (uniform load ≤ 5 kPa) along the long side direction to the concrete layer through the FRP support frame, avoiding slope instability caused by local stress concentration.

[0062] The vegetation bag-geogrid coupling of the composite anti-slip anchoring structure for pipeline backfill on high-steep slopes of the present invention adopts a layered filling technology. A 20 cm thick biological matrix layer (porosity ≥ 40%) is formed in the vegetation bag according to the ratio of seeds: planting soil: fertilizer = 1:8:0.5 (volume ratio), and combined with a double-layer three-dimensional geogrid (tensile strength ≥ 8 kN / m) to form a three-dimensional root anchoring network, shortening the time required for the vegetation coverage to reach 90% to 60% of the traditional method.

[0063] The support frame of the composite anti-slip anchoring structure for pipeline backfill on high-steep slopes of the present invention is made of 50 mm × 50 mm × 3 mm FRP resin angle steel (density 1.8 g / cm 3 , salt spray corrosion resistance level ≥ C5), which reduces the weight by 45% compared with the traditional galvanized angle steel, and extends the anti-corrosion life to more than 30 years, especially suitable for high-humidity slope environments.

[0064] The FRP support frame of the composite anti-slip anchoring structure for pipeline backfill on high-steep slopes of the present invention is prefabricated in the factory (dimension error ± 1 mm) and installed by on-site plugging (daily progress of a 3-person team ≥ 80 linear meters), and the construction efficiency is increased by 3 times compared with the traditional welding.

[0065] The support frame of the composite anti-sliding and anchoring structure for high-steep slope pipeline backfill of the present invention is implanted with a wireless inclination sensor (accuracy ±0.1°) to monitor the slope displacement in real time. The early warning threshold is set at 5 mm / 24 h, and the response speed is 10 times faster than that of manual inspection.

[0066] The grading layout strategy of the anchor bolts of the composite anti-sliding and anchoring structure for high-steep slope pipeline backfill of the present invention: According to the slope stress distribution law, HRB400 anchor bolts (Φ12×600 mm, spacing 600 mm) are used at the top / bottom of the slope, and the spacing of the slope surface anchor bolts is expanded to 120 mm. The gradient distribution of the anchoring force is realized through differential layout (the anchoring force at the slope top ≥20 kN, the slope surface ≥15 kN), and the material consumption is reduced by 30% compared with the equal-spacing layout scheme.

[0067] The composite anti-sliding and anchoring structure for high-steep slope pipeline backfill of the present invention uses Φ6 ropes (breaking strength ≥4 kN) for longitudinal and transverse cross-binding. Through the pre-tensioning device (tension control value 0.5 - 1.0 kN), the fitting degree of the geogrid and the slope surface reaches more than 95%, effectively suppressing the local bulging phenomenon under heavy rain conditions (rainfall intensity ≤50 mm / h).

[0068] The composite anti-sliding and anchoring structure for high-steep slope pipeline backfill of the present invention can effectively ensure the stability of the pipeline and the backfill layer, and the growth of the vegetation in the greening layer will also be guaranteed, reducing the adverse effects of rainwater scouring on the pipeline, the backfill layer and the greening vegetation. The composite anti-sliding and anchoring structure for high-steep slope pipeline backfill of the present invention sets a concrete protective layer to ensure the stability of the pipeline. The fixing of the support frame, the geogrid and the ropes on the surface ensures the stability of the vegetation planting bags. The use of the vegetation planting bags can realize the planting of greening vegetation, achieving the purpose of stable backfill and vegetation growth. The composite anti-sliding and anchoring structure for high-steep slope pipeline backfill of the present invention has good anti-scouring performance and is economical.

[0069] The above description is only the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. A composite anti-slip anchor structure for backfilling pipelines on high and steep slopes, characterized in that: include: A concrete protective layer is poured on the backfill soil of the pipe trench on the high and steep slope, and the concrete protective layer is arranged along the slope direction of the high and steep slope; A plurality of support frames, wherein the support frames are installed on the concrete protective layer, and the plurality of support frames are arranged at intervals along the length direction of the concrete protective layer, and a limiting space is formed between two adjacent support frames; A vegetation bag is laid in the limited space, and the vegetation bag is filled with vegetation seeds, planting soil and fertilizer; A geonet covering the vegetation bag; The anchor rope net pressed against the geonet comprises a plurality of transverse ropes and a plurality of longitudinal ropes arranged in a cross-direction, and both ends of the transverse ropes and both ends of the longitudinal ropes are respectively fixed to the high and steep slope by anchor nails.

2. The high and steep slope pipeline backfill composite anti-slip anchor structure according to claim 1 is characterized in that: The thickness of the concrete protective layer is 10 cm.

3. The high and steep slope pipeline backfill composite anti-slip anchor structure according to claim 1 is characterized in that: The support frame comprises a ground beam, the ground beam is laid on the concrete protective layer, the ground beam is connected with an anchor rod, the anchor rod is buried in the concrete protective layer, and a plurality of supporting rods are vertically arranged on the ground beam.

4. The high and steep slope pipeline backfill composite anti-slip anchor structure according to claim 3 is characterized in that: A connecting beam is connected between the ground beams of two adjacent support frames.

5. The high and steep slope pipeline backfill composite anti-slip anchor structure according to claim 4 is characterized in that: The vertical support frame is an FRP resin support frame.

6. The high and steep slope pipeline backfill composite anti-slip anchor structure according to claim 3 is characterized in that: The middle parts of the transverse ropes and the longitudinal ropes are connected to the supporting rods.

7. The high and steep slope pipeline backfill composite anti-slip anchor structure according to claim 3 is characterized in that: An inclination sensor is installed on the ground beam.

8. A construction method for a high and steep slope pipeline backfill composite anti-sliding anchor structure as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: After laying the pipeline on the steep slope, backfill soil is filled in the pipeline trench on the steep slope, and the backfill soil covers the pipeline; A concrete protective layer is poured on the backfill soil, and the concrete protective layer is arranged along the slope direction of the high and steep slope; After the concrete protective layer is initially set, a plurality of support frames are installed on the concrete protective layer, so that the plurality of support frames are arranged at intervals along the length direction of the concrete protective layer, and a limiting space is formed between two adjacent support frames; Laying vegetation bags in the confined space; Covering the vegetation bag with a geonet; The geonet is pressed against the anchoring rope net, and both ends of the transverse ropes and both ends of the longitudinal ropes of the anchoring rope net are fixed to the high and steep slope through anchor nails.

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