Pipe installation structure on high and steep rock slope, design and construction method

Abstract

The application discloses a pipeline installation structure on a high and steep rock slope, a design and a construction method, which comprises a fixed support and a plurality of bearing beams, the plurality of bearing beams are arranged on the rock slope at intervals, one end of the plurality of bearing beams is located in the rock slope, and the other end is exposed on the slope; the pipeline is fixed on the cantilever section of the bearing beam exposed on the slope through the fixed support, the pipeline is arranged transversely, and the plurality of bearing beams are arranged vertically; the pipeline is installed on the slope surface through drilling implantation instead of a large excavation mode, so that the integrity of the rock structure is maximally preserved, the environment is protected, and safety is ensured; the bearing beam is bonded with the hole wall rock through cement slurry in the application, the pipeline load is effectively transmitted to the stable rock mass, the stress path is clear and reliable, the angle steel of the bearing beam has excellent bending and shearing resistance, the drilling and installation process are relatively simple in the application, the requirement for the construction site is low, and the application is particularly suitable for being applied in dangerous terrain where large machinery cannot be used, and the construction period can be obviously shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic engineering, in particular to a pipeline installation structure on a high and steep rock slope and a construction method. BACKGROUND

[0002] In the construction of water conservancy and hydropower projects, in order to meet the needs of water delivery, drainage or irrigation, it is often necessary to lay pipelines in mountainous areas with complex topographic conditions. Such pipelines often need to cross high and steep rock slopes formed naturally or by artificial excavation. It has always been a major challenge in the engineering field to lay pipelines safely and economically on such special terrain.

[0003] Currently, the main method for laying pipelines on high and steep rock slopes is to excavate a platform and lay the pipeline on the platform. This method is convenient for pipeline installation and maintenance, but has the following disadvantages: first, the construction safety risk is high, the working surface is steep, and the construction personnel face the dual risks of falling from a high altitude and rock collapse; second, the construction efficiency is low and the cost is high, the large-scale excavation of rock slopes requires a long construction period, large excavation and support engineering quantity, and high engineering investment; third, the slope is disturbed violently, large-scale blasting and excavation operations fundamentally destroy the structure of the slope, and new engineering geological hazards are easily formed; fourth, the environmental impact is large, the original topography is irreversibly damaged, and it does not conform to the concept of green and sustainable engineering construction.

[0004] Therefore, there is an urgent need in the art for a new pipeline installation technology that can adapt to the special topographic and geological conditions of high and steep rock slopes, is safe and fast to construct, has little disturbance to the original structure of the slope, has low environmental impact, and is economically reasonable. SUMMARY

[0005] The purpose of the present application is to develop a high and steep rock slope pipeline installation structure that is stable in structure, safe and convenient to construct, has little disturbance to the slope, has low environmental impact, and is relatively economical in engineering investment, and to design and construct a method for calculating its characteristic parameters and structural strength.

[0006] To achieve the above purpose, the technical method of the present application comprises:

[0007] A pipeline installation structure on a high and steep rock slope, comprising a fixed support, further comprising a load-bearing beam, a plurality of load-bearing beams are arranged on the rock slope at intervals, one end of the plurality of load-bearing beams is located inside the rock slope, and the other end is exposed on the slope; the pipeline is fixed to the cantilever section of the load-bearing beam exposed on the slope by the fixed support, the pipeline is arranged transversely, and the plurality of load-bearing beams are arranged vertically.

[0008] Further, the fixing support comprises a clamp, a bolt, a nut and a washer; the clamp is in inverted U-shaped structure, and a threaded hole is arranged at the lower part of the clamp; the clamp is buckled on the pipeline, and the lower part of the clamp is fixed with the load-bearing beam by the nut; two threaded holes are arranged on the cantilever section of each load-bearing beam located outside the slope, the opening of the clamp faces downward, the two ends of the clamp pass through one threaded hole on the cantilever section of the load-bearing beam respectively, and then the clamp is fixed with the load-bearing beam by the nut, the nut and the washer are arranged on the vertical part of the clamp, and the washer is arranged between the nut and the load-bearing beam.

[0009] Further, the pipeline is supported by the cantilever sections of the load-bearing beams located outside the slope, and the pipeline passes through the clamp of the inverted U-shaped structure, and the pipeline is limited on the load-bearing beams by the clamp of the inverted U-shaped structure.

[0010] Further, the load-bearing beam is an isosceles angle steel, two drill holes are arranged on the horizontal limb of the isosceles angle steel as bolt holes, and the two limbs of the isosceles angle steel are provided with centering supports.

[0011] A design method of the pipeline installation structure on the high and steep rock slope, the load-bearing beam is installed on the rock slope by the anchoring drill hole, the diameter of the anchoring drill hole for installing the load-bearing beam is The design method is: ,

[0012] wherein, represents the diameter of the anchoring drill hole;

[0013] represents the width of the isosceles angle steel.

[0014] Further, a parameter calculation model of the load-bearing beam of the high and steep rock slope is established:

[0015] ,

[0016] wherein, represents the total length of the load-bearing beam;

[0017] represents the length of the anchoring section of the load-bearing beam;

[0018] represents the length of the cantilever section of the load-bearing beam;

[0019] represents the inner diameter of the pipeline;

[0020] , , , respectively represent the weight per meter of the pipeline, the water, the pipeline insulation layer and the load-bearing beam.

[0021] indicates the valve or pipe weight acting on the load-bearing beam;

[0022] indicates the load-bearing beam spacing along the pipeline axis direction;

[0023] indicates the allowable bearing capacity of the rock mass of the rock slope;

[0024] indicates the load-bearing beam angle steel section modulus;

[0025] indicates the load-bearing beam equal angle steel side width;

[0026] indicates the load-bearing beam angle steel side thickness;

[0027] indicates the elastic modulus of the load-bearing beam steel;

[0028] indicates the load-bearing beam angle steel section moment of inertia.

[0029] A construction method for the pipeline installation structure on the high and steep rock slope, the method comprising:

[0030] Step 1: Determine the parameters, including collecting the physical and mechanical indicators of the rock mass of the rock slope, the pipeline diameter, the wall thickness, the foundation data; Calculate the drilling diameter and depth, the length of the anchor segment of the load-bearing beam angle steel, the length of the cantilever segment and the spacing between multiple load-bearing beams;

[0031] Step 2: According to the size determined in step 1, make the load-bearing beam and the fixing support, and rust the load-bearing beam angle steel and paint the surface with epoxy zinc primer for corrosion protection. Weld the centering support on the load-bearing beam.

[0032] Step 3: Drilling measurement and lofting, on the high and steep rock slope, along the design axis of the pipeline, position the drill hole on the rock slope according to the load-bearing beam spacing, drilling diameter and depth determined in step 1. After drilling is completed, the hole needs to be cleaned.

[0033] Step 4: Load-bearing beam implantation and grouting anchoring, insert the load-bearing beam angle steel into the drill hole, and pour ordinary portland cement slurry into the hole through the grouting pipe;

[0034] Step 5: Pipeline installation and fixation, after the curing of the grouting material reaches the design strength, install the pipeline, place the pipeline on the cantilever segment of the angle steel through hoisting equipment, fix the pipeline on the angle steel with inverted U-shaped hoops, and lock the nuts;

[0035] Step 6: System check and supplementary anticorrosion, check the tightness of all pipe clamps and the stability of the entire pipeline system, and recoat the damaged anticorrosion layer during construction.

[0036] Complete the installation of the pipeline on the high and steep rock slope.

[0037] The beneficial effects of the present application include:

[0038] 1. Minimize slope disturbance: The present application adopts "drilling implantation and slope surface installation of pipeline" instead of "large excavation", which maximizes the integrity of the rock structure, is environmentally friendly and safe.

[0039] 2. Stable structure and clear force transmission: In the present application, the load-bearing beam is bonded to the hole wall rock through cement slurry, effectively transmitting the pipeline load to the stable rock mass, and the force transmission path is clear and reliable. The angle steel of the load-bearing beam itself has excellent bending and shear resistance.

[0040] 3. Quick construction and strong adaptability: The drilling and installation process in the present application is relatively simple, with low requirements for the construction site, especially suitable for application in rugged terrain where large machinery cannot be used, which can significantly shorten the construction period.

[0041] 4. Good economy: Compared with the traditional large excavation and open pipeline, the material cost of the present application is controllable, the construction efficiency is high, and the comprehensive economic benefit is significant. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a side view of the pipeline installation structure of the present application.

[0043] Figure 2 It is a plan view of the pipeline installation structure of the present application.

[0044] Figure 3 It is a cross-sectional view of the pipeline installation structure of the present application.

[0045] Figure 4 It is a sectional view of the fixed support of the present application.

[0046] Figure 5 It is a detailed view of the connection between the load-bearing beam and the fixed support of the present application.

[0047] Wherein: load-bearing beam 1; fixed support 2; clamp 21; nut 22; gasket 23; pipeline 3; slope 4. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be given below in combination with the drawings and examples. It should be understood that the specific examples described herein are part of the examples of the present application, but not all the examples of the present application, and are not intended to limit the present application. Based on the examples in the present application, all other examples obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0049] The present application provides a pipeline installation structure for high and steep rock slope, as shown in Figure 1 、 Figure 2 and Figure 3 , which mainly comprises a load-bearing beam 1 and a pipeline fixing support 2. A plurality of load-bearing beams 1 are anchored in the rock mass slope at a certain interval, and the water conveying pipeline 3 is fixed on the cantilever section of the load-bearing beam exposed to the slope 4 through the fixing support 2. The pipeline 3 is arranged transversely, and the load-bearing beam 1 is arranged vertically.

[0050] The load-bearing beam 1 adopts Q355 material equal limb angle steel, and the specification, model and length including the anchoring section length and the cantilever section length are determined according to the bending resistance, shear resistance and deformation calculation; wherein the anchoring section refers to the part of the load-bearing beam 1 located in the slope, and the cantilever section refers to the part of the load-bearing beam 1 located outside the slope.

[0051] ① The diameter of the anchor hole for installing the load-bearing beam 1 is :

[0052] In the formula, indicates the diameter of the anchor hole, mm;

[0053] indicates the side width of the load-bearing beam equal angle steel, mm.

[0054] ② The length L of the load-bearing beam is

[0055] According to the established parameter calculation model of the load-bearing beam of high and steep rock slope, the length L of the load-bearing beam and the selection of angle steel are determined:

[0056] ,

[0057] Among them, indicates the total length of the load-bearing beam;

[0058] indicates the anchoring section length of the load-bearing beam;

[0059] indicates the cantilever section length of the load-bearing beam;

[0060] indicates the inner diameter of the pipeline;

[0061] , , , are respectively the self - weight of the pipeline per meter, the self - weight of water, the self - weight of the pipeline insulation layer, and the self - weight of the bearing beam;

[0062] represents the self - weight of valves or pipe fittings acting on the bearing beam;

[0063] represents the spacing of the bearing beams along the pipeline axis; <00%>0174>

[0064] represents the allowable bearing capacity of the rock mass of the rock slope;

[0065] represents the section modulus of the angle steel of the bearing beam;

[0066] represents the width of the side of the equal - angle steel of the bearing beam;

[0067] represents the thickness of the side of the angle steel of the bearing beam;

[0068] represents the elastic modulus of the steel of the bearing beam;

[0069] represents the moment of inertia of the section of the angle steel of the bearing beam.

[0070] The bearing beam is horizontally anchored in the rock slope. The method of inserting the beam first and then grouting is adopted. The anchoring material is ordinary Portland cement slurry with a strength grade not lower than 42.5. If the groundwater in the slope is corrosive, corrosion - resistant cement should be used accordingly.

[0071] To ensure the thickness of the cement slurry protective layer of the bearing beam, centering supports are provided on both legs of the equal - angle steel. The centering supports are welded by φ10mm "U" - shaped short steel bars. The top length is 100mm, the bottom lengths on both sides are 50mm, the height is 30mm, and the spacing is 1.5m. They are welded in the middle part of the two legs of the angle steel. Specifically, first determine the design center of the cement slurry protective layer of the bearing beam, then find the geometric center of the equal - angle steel, make the two centers on the same vertical / horizontal line first. On the two legs of the angle steel, install the centering supports symmetrically along the reference line. The supporting ends of the supports will abut against the inner side of the beam formwork or the main reinforcement, forming a bidirectional symmetric supporting force. Fix the supports to the angle steel, the supports to the main reinforcement or formwork of the beam firmly respectively. When pouring the cement slurry, the symmetric supporting force will offset the impact force of the slurry, prevent the angle steel from shifting to any side, and always keep the two centers coincident. The centering support belongs to the prior art and will not be elaborated here.

[0072] The horizontal limb of the load-bearing beam is provided with two drill holes, which are threaded holes for fixing the pipe fixing support hoop bolt connection, and the fixing support is fixed on the load-bearing beam 1 through the threaded holes. The diameter of the drill hole is 25.5 mm, and the center distance of the drill hole from the outer wall of the pipe is 15.75 mm.

[0073] The pipe 3 is fixed on the middle part of the cantilever section of the load-bearing beam by the fixing support 2, as shown in Figure 4 、 Figure 5 The fixing support 2 mainly includes a hoop 21, a nut 22 and a gasket 23.

[0074] The hoop 21 is a reverse "U" type structure with a diameter of 24 mm, and a threaded mouth is arranged at the lower part with a length of 120 mm. The hoop is buckled on the pipe with a gap of 3 mm from the outer edge wall of the pipe, and the lower part is fixed with the load-bearing beam by the nut. The nut is M24, and the inner diameter of the gasket is 26 mm. One set of fixing support includes one hoop, four nuts and four gaskets. Two threaded holes are pre-set on the cantilever section of each load-bearing beam 1 located outside the slope, and the opening of the "U" type hoop faces downward. After the two ends of the "U" type hoop pass through one threaded hole on the cantilever section of the load-bearing beam 1 respectively, the "U" type hoop is fixed with the load-bearing beam 1 by the nut. As a preferred embodiment, the nut and the gasket are arranged at the contact part of the "U" type hoop with the load-bearing beam 1 on the upper surface of the load-bearing beam 1 and the contact part of the "U" type hoop with the load-bearing beam 1 on the bottom surface of the load-bearing beam 1. The nut and the gasket are sleeved on the vertical part of the "U" type hoop, and the gasket is located between the nut and the load-bearing beam.

[0075] The pipe 3 is supported by the cantilever section of the load-bearing beam 1 located outside the slope, and the pipe 3 passes through each fixing support 2, i.e. the pipe 3 passes through the hoop of each reverse "U" type structure. The pipe 3 is limited on the load-bearing beam 1 by the hoop of the reverse "U" type structure, and the hoop of the reverse "U" type structure is fixed with the load-bearing beam 1 by the nut.

[0076] The present application provides a construction method of a pipe installation structure for a high and steep rock slope, which mainly includes the following steps: calculating and determining the size parameters, purchasing and manufacturing the parts, drilling hole measurement and layout, drilling and hole cleaning, load-bearing beam implantation and grouting anchoring, pipe hoisting and fixing, system inspection and supplementary corrosion prevention, etc.

[0077] The following will be further described:

[0078] 1. Calculating and determining the parameters: collecting the physical and mechanical indicators of the rock mass of the rock slope, the basic data such as the pipe diameter and wall thickness of the pipe, the type of the load-bearing beam angle steel, the length of the anchoring section, the length of the cantilever section, the spacing, etc. need to be calculated and determined to ensure that the bending resistance, shear resistance and deformation meet the specification requirements.

[0079] 2. Parts procurement and fabrication: According to the size determined in step 1, procure and fabricate the load-bearing beam and the fixing support, rust the load-bearing beam angle steel and paint the surface with epoxy zinc primer for corrosion protection, and weld the centering support.

[0080] 3. Drilling measurement and lofting: On the high and steep rock slope, along the pipeline design axis, position the drilling according to the load-bearing beam spacing determined in step 1 on the rock slope.

[0081] 4. Drilling and hole cleaning: The drilling diameter and depth are calculated according to step 1, the drilling perpendicularity deviation is allowed to be ±5%, and the drilling position deviation is allowed to be ±10mm. After drilling, clean the hole thoroughly.

[0082] 5. Load-bearing beam implantation and grouting anchoring: Insert the load-bearing beam angle steel into the drilling, ensure that the angle steel is located in the center of the hole through the centering support, and make one limb of the angle steel perpendicular to the pipeline axis to facilitate the installation of the fixing support; pour ordinary portland cement grout into the hole through the grouting pipe, the cement strength grade should not be less than 42.5, and the grouting should be full to ensure that the angle steel is firmly combined with the rock mass.

[0083] 6. Pipeline installation and fixation: After the curing of the grouting material reaches the design strength, install the pipeline. Place the pipeline on the cantilever section of the angle steel through hoisting equipment. Use inverted "U" type pipe clamps to fix the pipeline on the angle steel, lock the nuts to ensure that there is no looseness.

[0084] 7. System inspection and supplementary corrosion protection: Check the tightness of all pipe clamps and the stability of the entire pipeline system, and recoat the corrosion layer scratched during construction.

[0085] Through the above steps, the implementation of the present application is completed.

[0086] The above examples are only examples for clarity and do not limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to exhaust all embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A design method of a pipeline installation structure on a high and steep rock slope including a fixed support (2), characterized in that: The installation structure further comprises load-bearing beams (1), a plurality of load-bearing beams (1) are arranged on the rock mass slope at intervals, one end of the plurality of load-bearing beams (1) is located in the rock mass slope, and the other end is exposed on the slope; the pipeline (3) is fixed on the cantilever section of the load-bearing beam exposed on the slope through the fixing support (2), the pipeline (3) is arranged transversely, and the plurality of load-bearing beams (1) are arranged vertically; The design method comprises: Anchor hole diameter for installing load bearing beam Satisfy , wherein, represents the anchor hole diameter; represents the equal leg angle steel leg width; According to the established high and steep rock slope load-bearing beam parameter calculation model, the length L of the load-bearing beam and the selection of the angle steel are determined, and the high and steep rock slope load-bearing beam parameter calculation model is as follows: ， wherein represents the total length of the load-bearing beam; L represents the length of the anchoring segment of the load-bearing beam; L represents the length of the cantilevered section of the load-bearing beam; D represents the internal diameter of the pipe; , , , Wp, Ww, Wp and Wb are the weight per meter of the pipeline, water, pipeline insulation layer and bearing beam, respectively. G represents the weight of the valve or pipe fitting acting on the load-bearing beam; represents the distance between the load-bearing beams in the direction of the pipe axis; represents the allowable bearing capacity of the rock mass of the rock slope; denotes the section modulus of the load-bearing beam angle steel; represents the flange width of an angle steel such as a load-bearing beam; represents the flange thickness of the load bearing beam angle steel; E represents the modulus of elasticity of the steel material of the load-bearing beam; I = represents the section modulus of the load-bearing beam angle steel.

2. The method for designing a pipeline installation structure on a high and steep rock slope according to claim 1, characterized in that: The fixing support (2) comprises a clamp (21), a nut (22) and a gasket (23); the clamp (21) is in a reverse U-shaped structure, and a threaded hole is arranged at the lower part; the clamp (21) is buckled on the pipeline (3), and the lower part of the clamp (21) is fixed with the load-bearing beam (1) by means of the nut (22); two threaded holes are arranged on the cantilever section of each load-bearing beam (1) located outside the slope, the opening of the clamp (21) faces downward, the two ends of the clamp (21) pass through one threaded hole on the cantilever section of the load-bearing beam (1) respectively, and then the clamp (21) is fixed with the load-bearing beam (1) by means of the nut (22); the contact part of the clamp (21) with the load-bearing beam (1) on the upper surface of the load-bearing beam (1) and the contact part of the clamp (21) with the load-bearing beam (1) on the bottom surface of the load-bearing beam (1) are all provided with the nut (22) and the gasket (23), the nut (22) and the gasket (23) are sleeved on the vertical part of the clamp (21), and the gasket (23) is located between the nut (22) and the load-bearing beam (1).

3. The method for designing a pipeline installation structure on a high and steep rock slope according to claim 2, characterized in that: The pipeline (3) is supported by the cantilever section of the plurality of load-bearing beams (1) located outside the slope, the pipeline (3) passes through the clamp (21) of each reverse U-shaped structure, and the pipeline (3) is limited on the plurality of load-bearing beams (1) by means of the clamp (21) of the reverse U-shaped structure.

4. The method for designing a pipeline installation structure on a high and steep rock slope according to claim 1, characterized in that: The load-bearing beam (1) is an equal-leg angle steel, two drill holes are arranged on the horizontal leg of the equal-leg angle steel as bolt holes, and the two legs of the equal-leg angle steel are both provided with a centering support.

5. A construction method for the pipe installation structure on a high and steep rock slope according to claim 1, characterized in that, The installation structure is designed according to the design method of claim 1, and the construction method comprises: Step 1: determining parameters, including collecting rock mass physical and mechanical indexes of the rock slope, basic data of the pipeline diameter and wall thickness, calculating the drill hole diameter and depth, the length of the load-bearing beam angle steel anchoring section, the length of the cantilever section and the spacing between the plurality of load-bearing beams; Step 2: according to the sizes determined in step 1, the load-bearing beam and the fixing support are manufactured, the load-bearing beam angle steel is rusted and is coated with an epoxy zinc-rich primer on the surface for corrosion protection treatment, and the centering support is welded on the load-bearing beam; Step 3: drill hole measurement and lofting, on the high and steep rock slope, along the pipeline design axis, according to the load-bearing beam spacing, the drill hole diameter and depth determined in step 1, the drill hole is positioned on the rock slope, after the drill hole is completed, the hole needs to be cleaned; Step 4: load-bearing beam implantation and grouting anchoring, the load-bearing beam angle steel is inserted into the drill hole, and ordinary Portland cement slurry is injected into the hole through a grouting pipe; Step 5: pipeline installation and fixation, after the curing of the grouting material reaches the design strength, the pipeline is installed, the pipeline is placed on the cantilever section of the angle steel by hoisting equipment, the pipeline is fixed on the angle steel by means of the reverse U-shaped clamp, and the locking nut is used. Step 6: System check and supplementary anticorrosion, check the fastening of all pipe collars and the stability of the entire pipeline system, and recoat the anticorrosion layer scratched during construction; Complete the installation of the pipeline on the high and steep rock slope.

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