Construction method for large-diameter pipeline non-destructive crossing of pipe culvert

Abstract

The present application relates to the technical field of pipe culvert construction, in particular to a construction method for large-diameter pipeline nondestructive crossing of a pipe culvert, which simulates the stress section of the pipeline after crossing the pipe culvert through BIM technology, calculates the fixing points where the support needs to be set, and designs the fixing support in advance according to the stress size and direction, so that the fixing of the support to the pipeline is more reliable, displacement of the pipeline due to large stress is avoided, accurate calculation and control of the pipeline stress are realized, the use of the support is reduced, and the construction cost and construction time are reduced.

Description

Technical Field

[0001] This invention relates to the field of culvert construction technology, specifically to a construction method for non-destructive passage of large-diameter pipelines through culverts. Background Technology

[0002] In recent years, long-distance heating has developed rapidly. During the installation of large-diameter heating pipelines, creating the right installation environment is the most fundamental and challenging aspect, including trench excavation and special section crossings. When crossing culverts, most culverts are roughly U-shaped, with higher sides and a lower middle. After the pipeline is constructed according to the culvert's route, high-temperature, high-pressure liquid is injected into the pipeline. Due to the change in internal fluid conditions, the pipeline experiences upward stress, causing it to elongate to both sides, similar to a long, thin balloon that remains intact when deflated but tends to straighten once inflated. Accurately overcoming this pipeline stress requires precise calculation of stress points. Currently known construction methods for crossing culverts involve designing the pipeline elevation and route based on culvert drawings, and then fixing supports based on the internal workings and the maximum possible stress. However, this method lacks scientific calculation and uses outdated support structures that cannot effectively secure the pipeline, potentially leading to misalignment and significant displacement. Summary of the Invention

[0003] To address the problem of significant pipeline displacement during culvert construction in existing technologies, this invention provides a non-destructive construction method for large-diameter pipelines crossing culverts. This method, through precise calculation and control, reduces the use of supports and lowers construction costs.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] The construction method for non-destructive crossing of large-diameter pipelines through culverts includes the following steps:

[0006] Step 1: Based on the pipeline drawings, perform BIM modeling and culvert modeling, and assign pipeline diameter and wall thickness parameters. Import the pipeline model into the sys simulation software and assign tensile strength and yield strength parameters to the pipeline material.

[0007] Step 2: Simulate the working condition of the pipeline with both ends fixed and the middle section unfixed. Assign the working condition of the pipeline medium to the port of the model, without considering the resistance loss and temperature change along the way, and run the calculation.

[0008] Step 3: After calculation, the maximum stress section and the maximum deformation section of the pipeline under the working condition in Step 2 are obtained. The sections of the maximum stress section and the maximum deformation section match. When the maximum deformation reaches 2.14m, pipeline supports must be installed. The stress distribution of the pipeline section at the maximum stress point is determined to determine the direction and magnitude of the stress. In the pipeline section area with the maximum stress, fixed supports are installed to offset the internal stress of the pipeline. The method of setting fixed supports is as follows: set fixed points at the pipeline bends, and set one support every 20m. Calculate again.

[0009] Step 4: Some free sections still lack fixed points, causing pipe displacement and deformation. Fixed points were installed at 30m intervals in the free sections without fixed points. Recalculation showed that the pipe stress was less than the maximum stress that the pipe protective shell could withstand, and all met the requirements of the pipe material.

[0010] Step 5: Reduce or adjust the fixed points to ensure that the pipeline can withstand the stress while minimizing the number of fixed points. Export the fixed point parameters, perform statistical analysis on the parameters to obtain the number of fixed points, the magnitude and direction of the stress at the fixed points, and design the corresponding fixed supports based on these parameters. Model the pipe culvert according to the pipe drawings and link and bind it with the pipeline model to share parameters. Determine the support location in the CFD simulation software and design the support, determining the support direction and the magnitude and direction of the stress it needs to bear.

[0011] Step Six: During construction, after the pipeline welding is completed, install fixed supports at the fixed points. In areas where the pipeline stress and displacement are large, supplement the limiting supports in the pipeline system according to the principle of one support every 20m, and remove the excess support equipment in the culvert.

[0012] The beneficial effects of the present invention through the above technical solution are as follows:

[0013] 1. This invention uses BIM technology to simulate the stress zone of a pipeline after it passes through a culvert, calculates the fixing points where supports need to be installed, and designs the fixing supports in advance according to the magnitude and direction of the stress, making the support fixation of the pipeline more reliable, avoiding displacement of the pipeline due to high stress, realizing accurate calculation and control of pipeline stress, reducing the use of supports, and lowering construction costs and time.

[0014] 2. The construction method of this invention avoids the potential structural damage to the culvert caused by construction, and achieves non-destructive crossing under precise stress offset. The design theory of this construction method is direct and effective, the construction is convenient, the equipment and machinery are simple, the construction speed is fast, the construction cost is low, and the operation is more stable and reliable, laying the foundation for the smooth commissioning of the project. At the same time, this construction method can be widely applied to similar projects.

[0015] 3. This invention achieves non-destructive fixation of pipelines through the phenomenon of fixed supports and limiting supports. The supports have no connection relationship with the pipelines or culverts, and will not cause damage to the pipelines or culverts, thereby reducing the repair time of the pipelines or culverts and shortening the construction time. Attached Figure Description

[0016] Figure 1 This is a process flow diagram of the construction method for non-destructive crossing of large-diameter pipes through culverts according to the present invention;

[0017] Figure 2 This is a schematic diagram of the gantry frame structure of the present invention;

[0018] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a schematic diagram of the structure of the fixing bracket of the present invention;

[0020] Figure 5 This is a schematic diagram of the limiting bracket of the present invention.

[0021] The attached diagram is labeled as follows: 1 is the upright of the frame, 2 is the crossbeam of the frame, 3 is the frame support, 4 is the diagonal brace, 5 is the brake caster, 6 is the lifting ring, 7 is the lifting device, 8 is the adjusting screw, 9 is the fixing block, and 10 is the adjusting nut.

[0022] 11 is a moisture-proof mat, 12 is a base plate, 13 is a triangular rib plate, 14 is a pipe fixing plate, 15 is a fixing top rod, 501 is a fixing plate top rod, 502 is a support plate top rod, 16 is a bolt rod, 17 is a top rod sleeve, 18 is a culvert wall support plate, 19 is an auxiliary support rod, 110 is an adjusting bolt, and 111 is a pipe.

[0023] 31 is the culvert, 33 is the support rod, 34 is the pad, and 35 is the diagonal brace. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] like Figure 1 As shown, the construction method for non-destructive passage of large-diameter pipelines through culverts is characterized by the following steps:

[0026] Step 1: Create a BIM model based on the pipeline drawings. The model should include parameters such as the pipeline material, outer diameter, and wall thickness, and the pipeline route should be reproduced at a 1:1 scale. Import the pipeline model into the Sys simulation software and assign parameters to the pipeline material. In this project, No. 20 steel is used as the pipeline material, and the parameters to be considered include tensile strength, yield strength, etc.

[0027] Step 2: Simulate the working condition of the pipeline with both ends fixed and the middle section unfixed; assign the working condition of the pipeline medium to the port of the model. The boundary conditions of this project are: medium is water, temperature is 130 degrees Celsius, flow velocity is 2.4 m / s, and pipeline pressure is 2.5 MPa; do not consider the resistance loss and temperature change along the way, and run the calculation.

[0028] Step 3: After calculation, the maximum stress section and the maximum deformation section of the pipeline under the working condition in Step 2 are obtained. It is found that the sections of these two unfavorable conditions match, and the stress distribution of the pipeline section at the point of maximum stress is obtained. The direction and magnitude of the stress are determined. The maximum deformation reaches 2.14m, which poses a serious safety hazard. Therefore, it is not feasible not to install pipeline supports. In the pipeline section area with the maximum stress, fixed supports are installed to offset the internal stress of the pipeline and prevent pipeline displacement and deformation. The installation method is as follows: fixed points are set at the pipeline bends, and additional supports are set every 20m. The calculation is repeated.

[0029] Step four: After calculation, it was found that the stress at the point of maximum stress in the pipeline decreased, which basically met the requirements of the pipeline material. However, some free sections still did not have fixed points, and the pipeline underwent displacement and deformation. At the locations of the free sections without fixed points, fixed points were set at 30m intervals, and the calculation was repeated.

[0030] Step 5: The calculations in Step 5 show that the pipeline stress is less than 3 MPa, which is the maximum stress that the pipeline protective shell can withstand, and all of this meets the requirements of the pipeline material.

[0031] Step six: Reduce or adjust the number of fixed points as much as possible.

[0032] Step 7: Export the fixed point parameters, perform statistical analysis on the parameters, and obtain the number of fixed points, the magnitude and direction of the stress at the fixed points. This data is the design data for the support structure.

[0033] Step 8: Model the pipe culvert according to the pipe drawings and link and bind it with the pipe model, share parameters, design the support at the location determined in the CFD simulation software, determine the support direction, and the magnitude and direction of the stress to be borne.

[0034] Step 9: After the design of the fixed support is completed, supplement the limiting supports in the pipeline system according to the principle of one support every 20m. The function of the limiting supports is to limit excessive displacement of the pipeline.

[0035] Step 10: Draw the fixed bracket and the limiting bracket. The drawings should include the following information: bracket location, bracket type and material, manufacturing method and installation method.

[0036] Step 11: During pipeline construction, in order to stabilize the relative position of the pipeline and the bottom of the culvert, the large pipeline needs to be installed parallel to the culvert. A gantry frame is designed as a tool for adjusting the height of the pipeline, and a spirit level is used to measure the parallelism with the culvert. After confirming that it is in place, the pipeline is fixed and the pipeline welding is completed.

[0037] Step 12: Install pipe fixing supports and limit supports.

[0038] Step thirteen: Remove the gantry and temporary supports to completely support the pipeline with non-destructive supports.

[0039] like Figures 2-3 As shown, this embodiment uses a simple gantry crane hoisting device, including two frame supports 3, which are arranged in parallel. Each frame support 3 has a brake caster 5 located at both ends. Each frame support 3 has a frame upright 1, which is perpendicular to the frame support 3. A frame beam 2 is located at the top of each upright 1, connecting the two uprights. A lifting ring 6 is mounted on the frame beam 2 and slidably connected to it. A lifting device 7 is connected to the lower end of the lifting ring 6, and the lifting device 7 has a hook for connecting to the object to be hoisted. The position of the lifting device 7 is changed by sliding the lifting ring 6 on the frame beam 2. After the lifting device 7 is slid to a suitable position, the pipe is hoisted using the lifting device 7. In this embodiment, the lifting device 7 is a hand-operated hoist lifting device.

[0040] An adjustment mechanism is provided on the frame beam 2, which adjusts the sliding motion of the lifting ring 6 on the frame beam 2. The adjustment mechanism is used to adjust the sliding motion of the lifting ring 6 on the frame beam 2.

[0041] The adjustment mechanism includes an adjusting screw 8, two fixing blocks 9, and adjusting nuts 10. The two fixing blocks 9 are fixed to the frame upright 1 and located on either side of the lifting ring 6. The adjusting screw 8 passes through the fixing blocks 9 and the lifting ring 6, and adjusting nuts 10 are provided at both ends of the adjusting screw 8. The adjusting screw 8 is rotatably connected to the fixing blocks 9 and threadedly connected to the lifting ring 6. By rotating the adjusting nuts 10, the adjusting screw 8 rotates, causing the lifting ring 6 to move on the screw, thus adjusting the position of the lifting ring 6.

[0042] The uprights of the frame are provided with diagonal braces 4, one end of which is connected to the uprights of the frame and the other end is connected to the end of the frame support 3.

[0043] In use, the adjusting screw 8 is rotated by turning the adjusting nut 10, which causes the lifting ring 6 to move on the screw, adjusting the position of the lifting device 7. After the lifting device 7 is slid to the appropriate position, the pipe is lifted by the lifting device 7.

[0044] like Figure 4 The fixed support in this embodiment adopts an adjustable and non-destructive fixing device for large-diameter heating pipes passing through protective facilities. It includes a base plate 12, on which a pipe 111 is mounted. A pipe fixing plate 14 is also mounted on the base plate 12, located on both sides of the pipe 111 and fixedly connected to it. A fixing rod 15 is provided on one side of the pipe fixing plate 14. The fixing rod 15 includes a fixing plate rod 501 and a supporting plate rod 502. One end of the fixing plate rod 501 is connected to the pipe fixing plate 14, and the other end is fitted with a rod sleeve 17. One end of the supporting plate rod 502 is... A culvert support plate 18 is connected to the other end of the top rod sleeve 17. The top rod sleeve 17 is provided with a bolt rod 16 that passes vertically through the top rod sleeve 17. The fixed plate top rod 501 and the support plate top rod 502 are respectively located on both sides of the bolt rod 16. Adjusting bolts 110 are provided at both ends of the bolt rod 16. One end of the adjusting bolt 110 is provided with a bolt sleeve. The bolt sleeve is rotatably connected to the adjusting bolt 110. An auxiliary support rod 19 is hinged to the outside of the bolt sleeve. Two auxiliary support rods 19 are provided on the adjusting bolt 110. The two auxiliary support rods 19 are respectively hinged to the fixed plate top rod 501 and the support plate top rod 502. Pipe 111 is fixed by two pipe fixing plates 14. The adjusting bolt 110 is rotated and moved on the bolt rod 16. The fixed top rod 15 is adjusted to extend and retract within the top rod sleeve by the auxiliary support rod 19, thereby adjusting the distance between pipe 111 and the inner wall of the culvert on both sides. One end of the support plate top rod 502 is connected to the culvert wall support plate 18 to increase the stress area of ​​the culvert concrete and avoid damage to the concrete structure.

[0045] A triangular rib 13 is provided at the connection between the pipe fixing plate 14 and the base plate 12. This prevents the pipe fixing plate 14 from breaking due to the lateral stress caused by the deformation of the pipe 111.

[0046] The culvert wall support plate 18 is designed according to the shape of the culvert wall. The culvert wall support plate 18 increases the stress-bearing area of ​​the culvert concrete and avoids damage to the concrete structure.

[0047] A moisture-proof pad 11 is provided below the base plate 12 to prevent friction damage between the bottom insulation skin of the pipe 111 and the bottom concrete of the culvert.

[0048] During use, the moisture-proof pad 11 prevents the outer skin of the insulation at the bottom of the pipe 111 from rubbing against the concrete at the bottom of the culvert and causing damage. The culvert wall support plate 18 increases the stress area of ​​the culvert concrete to avoid damage to the concrete structure. The pipe 111 is fixed by two pipe fixing plates 14. The adjusting bolt 110 moves on the bolt rod 16 by rotating the adjusting bolt. The fixed top rod 15 is adjusted to extend and retract within the top rod sleeve by the auxiliary support rod 19, thereby adjusting the distance between the pipe 111 and the inner walls of the culvert on both sides.

[0049] like Figure 5 As shown, the limiting bracket in this embodiment includes support rods 33. The pipe 111 is located inside the culvert 31. Support rods 33 are provided on both sides and above the pipe 111, and are positioned between the pipe 111 and the culvert 31. Each end of the support rod 33 has a pad 34. A diagonal brace 35 is provided on the support rod 33 above the pipe 111. One end of the diagonal brace 35 is connected to the support rod 33, and the other end is connected to the pad 34. The pad 34 at one end of the diagonal brace 35 rests against the inner wall of the culvert 33. The limiting bracket is not connected to either the pipe 111 or the culvert 31; the pipe 111 is fixed by the support rods 33 in three directions.

[0050] The embodiments described above are merely preferred embodiments of the invention and are not intended to limit the scope of the invention. Therefore, any equivalent changes or modifications made to the technical solutions described in the claims of this invention should be included within the scope of the patent application of this invention.

Claims

1. A construction method for non-destructive crossing of large-diameter pipelines through culverts, characterized in that, Includes the following steps: Step 1: Based on the piping drawings, perform BIM modeling and culvert modeling, assign relevant parameters to the piping, import the piping model into the Sys simulation software, and assign parameters to the piping material. Step 2: Simulate the working condition of the pipeline with both ends fixed and the middle section unfixed. Assign the working condition of the pipeline medium to the port of the model, without considering the resistance loss and temperature change along the way, and run the calculation. Step 3: After calculation, the maximum stress section of the pipeline under the working condition in Step 2 is obtained, and the stress distribution of the pipeline section at the maximum stress point is determined. The direction and magnitude of the stress are determined. In the pipeline section area with the maximum stress, a fixed support is set to offset the internal stress of the pipeline, and the calculation is performed again. Step 4: Some free sections still lack fixed points, causing pipe displacement and deformation. Fixed points were installed at the locations of the free sections without fixed points. Recalculation showed that the pipe stress was less than the maximum stress that the pipe protective shell could withstand, and all met the requirements of the pipe material. Step 5: Reduce or adjust the number of fixed points to ensure that the pipeline can withstand the stress while minimizing the number of fixed points. Design the corresponding fixed supports based on the calculation results in Step 4 and the culvert model. Step six: During construction, after the pipe welding is completed, install a fixing bracket at the fixing point and a limit bracket on the pipe.

2. The construction method for non-destructive crossing of large-diameter pipelines through culverts according to claim 1, characterized in that, In step one, parameters such as pipe diameter and wall thickness are assigned, as well as parameters such as tensile strength and yield strength of pipe material are assigned.

3. The construction method for non-destructive crossing of large-diameter pipelines through culverts according to claim 1, characterized in that, After calculation in step three, the maximum stress section and the maximum deformation section of the pipeline under the working condition in step two are obtained. The sections of the maximum stress section and the maximum deformation section match. When the maximum deformation reaches 2.14m, pipeline supports must be installed.

4. The construction method for non-destructive crossing of large-diameter pipelines through culverts according to claim 1, characterized in that, The method for setting up the fixed support in step three is as follows: a fixed point is set at the bend of the pipe, and another fixed point is set every 20m.

5. The construction method for non-destructive crossing of large-diameter pipelines through culverts according to claim 1, characterized in that, In step four, the fixed points are set at 30m intervals.

6. The construction method for non-destructive crossing of large-diameter pipelines through culverts according to claim 1, characterized in that, In step five, the fixed point parameters are exported, the parameters are statistically analyzed, and the number of fixed points, the magnitude and direction of the fixed point stress are obtained. The corresponding fixed bracket is designed based on these parameters.

7. The construction method for non-destructive crossing of large-diameter pipelines through culverts according to claim 6, characterized in that, Model the pipe culvert according to the pipe drawings and link and bind it with the pipe model, share parameters, determine the support position in the CFD simulation software and design the support, determine the support direction, and determine the magnitude and direction of the stress to be borne.

8. The construction method for non-destructive crossing of large-diameter pipelines through culverts according to claim 7, characterized in that, After the design of the fixed support is completed, the limit supports in the pipeline system are supplemented according to the principle of one support every 20m.

9. The construction method for non-destructive crossing of large-diameter pipelines through culverts according to claim 1, characterized in that, After the construction is completed in step six, remove any excess support equipment inside the culvert.

Images