An ecological hydraulic protection structure suitable for gas pipeline slope laying

Abstract

This utility model relates to the field of gas pipeline construction, specifically to an ecological hydraulic protection structure suitable for gas pipeline slope laying; it includes a masonry drainage ditch, a geocell protection structure, and a masonry toe wall set from top to bottom on the gas pipeline slope. The masonry drainage ditch has a U-shaped cross-section and is excavated and constructed along the left and right directions of the slope. The geocell protection structure is composed of multiple geocell units spliced ​​together, with a reinforced concrete capping beam at the top and multiple intersecting horizontal and vertical ribs laid on the surface of the geocell protection structure. The masonry toe wall also has a bottom drainage ditch. This utility model structure can improve the rainwater erosion resistance of the soil covering the pipeline, playing a role in protecting the pipeline soil covering; the backfill soil is reinforced to better adapt to slope deformation; and the use of reinforced concrete capping and longitudinal and transverse ribs to reinforce the slope better ensures the stability of the slope.

Description

Technical Field

[0001] This utility model relates to the field of gas pipeline construction, specifically to an ecological hydraulic protection structure suitable for gas pipeline slope laying. Background Technology

[0002] Shanxi Province, situated on the Loess Plateau, is characterized by a landscape of "two mountains flanking a river." Natural gas long-distance pipelines, the primary means of gas transportation, are vital lifelines connecting gas sources to users. These pipelines must traverse mountains to fulfill their transport missions. Historically, laying pipelines along mountain slopes has disturbed the original slope structure. Coupled with inconsistent quality in trench backfilling, this has led to pipelines being exposed during the rainy season due to the accumulation of rainwater on the slope tops and surfaces. Traditional hydraulic engineering protection methods often involved masonry facing and straw bag slope protection, depending on the slope gradient. However, masonry faces challenges: firstly, the scarcity and transportation of stone in mountainous areas significantly increases costs; secondly, the construction quality is often difficult to guarantee, with only a surface layer of mortar bonding and the interior often dry-laid, failing to achieve the desired protective effect. Straw bag slope protection, traditionally achieved through simple manual stacking, is prone to collapse during the rainy season.

[0003] Therefore, it is particularly important to study a water conservation measure that can be easily sourced in mountainous areas, is easy to construct, and has a certain degree of overall integrity. Summary of the Invention

[0004] This utility model addresses the problem that traditional methods of protecting gas pipelines laid on hillsides, such as masonry and straw bags, cannot protect the soil covering the pipeline against erosion and adapt to slope deformation. It provides an ecological hydraulic protection structure suitable for gas pipelines laid on slopes.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an ecological hydraulic protection structure suitable for laying gas pipeline slopes, comprising a masonry drainage ditch, a geocell protection structure, and a masonry toe wall set from top to bottom on the gas pipeline slope. The masonry drainage ditch has a U-shaped cross-section and is excavated and constructed along the left and right directions of the slope. The geocell protection structure is composed of multiple geocell units spliced ​​together. The geocell units are flexible, can be folded during transportation, and can be stretched into a mesh during construction. Each geocell in the geocell unit is filled with planting soil, and the planting soil is covered with planted grass. The geocell protection structure is fixed to the slope with pins or wooden piles. The top of the geocell protection structure is provided with a reinforced concrete capping beam, and multiple intersecting horizontal and vertical ribs are laid on the surface of the geocell protection structure. The masonry toe wall is also constructed with a bottom drainage ditch.

[0006] Furthermore, each geocell is quadrilateral or hexagonal in shape, and connecting plastic parts are welded to the front and rear ends or left and right end faces of the geocell unit. Adjacent geocell units are connected by inserting pins into the connecting plastic parts. The unexpanded geocell unit components are aligned, the corresponding connecting plastic parts are aligned, and special round pins are inserted.

[0007] Furthermore, the height of the geocell is 5~20cm.

[0008] Furthermore, the wooden piles fixed to the top and toe of the geocell protective structure are 500mm long and 40mm in diameter; the wooden piles fixed in the middle of the geocell protective structure are 20-50cm long and 3-5cm in diameter; all the wooden piles are perpendicular to the slope of the gas pipeline.

[0009] Furthermore, the masonry retaining wall includes an upper section and a lower section. The upper section is parallel to the slope of the gas pipeline and has a parallelogram-shaped cross-section. The lower section has an overall inverted trapezoidal cross-section and a drainage ditch is also provided in the lower section.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. This utility model improves the backfill soil of gas pipelines laid on hillsides, enhancing the soil covering the pipeline's resistance to rainwater erosion and thus protecting the pipeline's soil covering.

[0012] 2. This utility model reinforces the backfill soil by setting up geocells, thereby improving the mechanical properties and integrity of the backfill soil and better adapting to slope deformation. The use of reinforced concrete capping and longitudinal and transverse ribs to strengthen the slope further ensures its stability.

[0013] 3. This utility model further improves the mechanical properties of the surface backfill soil and restores the ecology by sowing grass seeds in the geocell chamber.

[0014] 4. This utility model also has better economic benefits than previous hydraulic engineering protection measures (such as masonry slope protection, stacking straw bags, etc.), reducing labor costs and material costs.

[0015] 5. Use masonry drainage ditches on the slope to collect and drain rainwater from the top of the slope, and use masonry retaining walls to reinforce the bottom corner of the slope to further improve the stability of the slope. Attached Figure Description

[0016] Figure 1 This is an elevation view of the geocell protection structure of this utility model.

[0017] Figure 2 This is a cross-sectional view of the ecological hydraulic engineering protection structure of this utility model.

[0018] Figure 3 This is a schematic diagram of an unfolded geocell unit.

[0019] Figure 4 This is a schematic diagram of the folded geocell unit.

[0020] The markings in the image are as follows:

[0021] 1-Masonry drainage ditch, 2-Geocell protective structure, 3-Masonry retaining wall, 4-Planted grass, 5-Reinforced concrete capping beam, 6-Horizontal rib, 7-Vertical rib, 8-Bottom drainage ditch, 9-Wooden pile, 10-Gas pipeline. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments. Example 1

[0023] like Figure 1 and 2 As shown, an ecological hydraulic protection structure suitable for laying gas pipelines on slopes includes a masonry drainage ditch 1, a geocell protection structure 2, and a masonry toe wall 3, arranged from top to bottom on the gas pipeline slope. The masonry drainage ditch 1 has a U-shaped cross-section and is excavated and constructed along the left and right directions of the slope. The geocell protection structure 2 is composed of multiple geocell units spliced ​​together. The geocell units are flexible, can be folded during transportation, and can be stretched into a mesh during construction (e.g., Figure 3 and 4 As shown), each geocell in the geocell unit is filled with planting soil, and the planting soil is covered with planting grass 4. The geocell protection structure 2 is fixed to the slope with pins or wooden piles 9. The top of the geocell protection structure 2 is provided with a reinforced concrete capping beam 5, and multiple intersecting horizontal ribs 6 and vertical ribs 7 are laid on the surface of the geocell protection structure 2. The masonry retaining wall 3 is also constructed with a bottom drainage ditch 8.

[0024] Geocell vegetation slope protection is used to protect gas pipelines laid on slopes. Its function is to provide a stable and favorable growing environment for turfgrass within the geocells. Using geocells for planting grass allows for the full greening of barren slopes, and the perforated cells increase slope drainage. It serves to stabilize the soil and drain water, providing effective hydraulic protection for the backfilled slope surface after disturbance of pipe trenches.

[0025] Geocells are primarily made of PE or PP materials, formed into sheets for engineering projects through a stocking-making process, and then welded together to form three-dimensional cells. In application, the required specifications can be assembled by connecting the units. The connection method between geocell units is mostly plug-in connection, where the component plastic parts are welded to the front and rear ends or left and right end faces of the geocell unit. During connection, the unfurled geocell components are aligned, the corresponding connecting plastic parts are aligned, and special round pins are inserted.

[0026] Furthermore, each geocell is either quadrilateral or hexagonal in shape.

[0027] Furthermore, the height of the geocell is 5-20cm, preferably 8-10cm, and the spacing between weld points is 300-400cm, preferably 400cm.

[0028] Furthermore, the wooden piles 9 fixed to the top and toe of the geocell protection structure 2 are 500mm long and 40mm in diameter; the wooden piles 9 fixed in the middle of the geocell protection structure 2 are 20-50cm long and 3-5cm in diameter; all the wooden piles 9 are perpendicular to the slope of the gas pipeline.

[0029] Furthermore, the masonry retaining wall 3 includes an upper section and a lower section. The upper section is parallel to the slope of the gas pipeline and has a parallelogram cross-section. The lower section has an overall inverted trapezoidal cross-section and a drainage ditch 8 is also provided in the lower section.

[0030] Geocell vegetation slope protection is a slope protection technique that involves filling geocells that are deployed and fixed on the slope with improved topsoil, then sowing grass seeds in the geocells, and finally spraying them in.

[0031] The applicable constraints for using geocells in grass-planted slope protection include the following aspects:

[0032] (1) Geocells are used to protect soil slopes that are susceptible to erosion, but are not suitable for slopes that are submerged for a long time.

[0033] (2) Geocells are generally used under conditions where the allowable flow velocity is less than 2 m / s.

[0034] (3) The appropriate slope ratio is generally not steeper than 1:1, but by improving the geological conditions of the slope and increasing the number of fixed piles, it can be applied to slope protection with a slope ratio not steeper than 1:0.75.

[0035] (4) Considering the growth factors of vegetation, geocell construction should be carried out in spring and autumn, and construction should be avoided as much as possible during the rainy season.

[0036] (5) The slope protected by geocells must be the original soil. If it is loose soil, it must be compacted.

[0037] (6) Geocells are shallow scour protection structures, and their combination with deep scour protection structures (such as cutoff walls) will have a better effect.

[0038] The construction process for geocell-vegetated slope protection is as follows: leveling the slope surface -- geocell construction -- backfilling with topsoil and sowing grass seeds -- preliminary maintenance.

[0039] 1. Level the slope

[0040] The smoothness of the slope is crucial to the success of geocell planting and slope protection projects. Uneven slopes can easily lead to stress concentration when laying geocells, causing weld cracks and ultimately, geocell collapse. Therefore, the slope must be leveled to meet design requirements, and manual slope trimming should be used to remove loose rocks and other dangerous stones.

[0041] 2. Geocell Construction

[0042] (1) The geocell units are connected by a plug-in connection method. When connecting, the unexpanded geocell components are aligned, the corresponding connecting plastic parts are aligned, and special round pins are inserted. When unfolding and connecting, different unit combination forms are adopted according to different slope ratios.

[0043] (2) During installation, first fix the top of the slope with longer fixing nails or wooden stakes, and then proceed according to the design drawings. Fix the bottom of the slope with fixing nails or longer wooden stakes. In the middle part of the cell, fix it with dowels or short wooden stakes at intervals. The short wooden stakes should be 20-50cm long and 3-5cm in diameter, preferably made of wood. The fixing stakes should be driven in so that most of them are buried in the original slope and perpendicular to the original slope. When the slope is relatively gentle (slope ratio gentler than 1:2), positioning fixing stakes can be set only at the corners and sides of a single cell to ensure the full unfolding of the cell. When the slope ratio is steeper than 1:2, in addition to setting positioning fixing stakes, a certain number of anti-slip fixing stakes must also be set inside the cell.

[0044] 3. Backfill with topsoil and sow grass seeds.

[0045] After the geocells are fixed, improved topsoil can be filled into them. In principle, the original soil should be the main component, but gravelly soil, sandy soil, silty soil, and clayey soil can be used. During filling, gently pat the soil to compact it, and backfill with moist clay near the surface until it is level with the geocell surface. Suitable local grass seeds can be sown during the backfilling process.

[0046] 4. Initial maintenance

[0047] Watering maintenance: The maintenance period depends on the growth of vegetation on the slope, but is generally no less than 45 days.

[0048] Pest and disease control: Broad-spectrum pesticides should be sprayed regularly to prevent the occurrence of various pests and diseases.

[0049] Topdressing: Topdressing should be applied in a timely manner according to the plant's growth needs.

[0050] Timely reseeding: After the grass seeds germinate, sparse, grassless areas should be reseeded in a timely manner.

[0051] 5. To further ensure the stability of the slope, the following structure is designed:

[0052] A masonry drainage ditch 1 is constructed on the slope (5cm thick C15 fine aggregate concrete plastered, M10 cement mortar laid with MU30 rubble soil compacted to a density greater than 90%) to collect and drain rainwater from the top of the slope. See the attached diagram for details. Figure 2 ;

[0053] The bottom corner of the slope is reinforced by using masonry retaining wall 3. See attached diagram for details. Figure 2 ;

[0054] The slope is reinforced with five reinforced concrete capping beams and longitudinal and transverse ribs. See the attached diagram for details. Figure 1 .

[0055] This invention utilizes simple backfill soil from hillsides, incorporating geocells and simultaneously sowing grass seeds to reinforce the soil and stabilize the slope. The geocells themselves, used for grass-planted slope protection, effectively improve the soil's mechanical properties, acting as soil reinforcement. By sowing grass seeds within the geocells, this invention further improves the mechanical properties of the surface backfill soil, restoring the ecosystem. Furthermore, this invention offers significant economic benefits compared to traditional hydraulic engineering protection measures (such as masonry slope protection and the use of straw bags), reducing labor and material costs.

Claims

1. An ecological hydraulic protection structure suitable for the laying of a gas pipeline slope, characterized in that, The structure includes a masonry drainage ditch (1), a geocell protection structure (2), and a masonry retaining wall (3) set from top to bottom on the slope of the gas pipeline. The masonry drainage ditch (1) has a U-shaped cross-section and is excavated and constructed along the left and right directions of the slope. The geocell protection structure (2) is composed of multiple geocell units spliced ​​together. The geocell units are flexible, can be folded during transportation, and can be stretched into a net during construction. Each geocell in the geocell unit is filled with planting soil, and the planting soil is covered with planting grass (4). The geocell protection structure (2) is fixed to the slope with pins or wooden piles (9). The top of the geocell protection structure (2) is provided with a reinforced concrete capping beam (5), and multiple intersecting horizontal ribs (6) and vertical ribs (7) are laid on the surface of the geocell protection structure (2). The masonry retaining wall (3) is also constructed with a bottom drainage ditch (8).

2. The ecological hydraulic protection structure suitable for gas pipeline slope laying according to claim 1, characterized in that, Each geocell is quadrilateral or hexagonal in shape. Connecting plastic parts are welded to the front and rear ends or left and right end faces of the geocell unit. Adjacent geocell units are connected by inserting pins into the connecting plastic parts. The unexpanded geocell unit components are aligned, the corresponding connecting plastic parts are aligned, and special round pins are inserted.

3. The ecological hydraulic protection structure suitable for gas pipeline slope laying according to claim 1, characterized in that, The height of the geocell is 5~20cm.

4. An ecological hydraulic protection structure suitable for gas pipeline slope laying according to claim 1, characterized in that, The length of the wooden piles (9) fixed to the top and toe of the geocell protection structure (2) is 500 mm and the diameter of the piles (9) is 40 mm; the length of the wooden piles (9) fixed in the middle of the geocell protection structure (2) is 20~50 cm and the diameter of the piles is 3~5 cm; all the wooden piles (9) are perpendicular to the slope of the gas pipeline.

5. An ecological hydraulic protection structure suitable for gas pipeline slope laying according to claim 1, characterized in that, The masonry retaining wall (3) includes an upper section and a lower section. The upper section is parallel to the slope of the gas pipeline and has a parallelogram cross section. The lower section has an overall inverted trapezoidal cross section. The lower section also has a drainage ditch (8).

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