Large-span gas pipeline structure
By setting reinforcement plates and wing plates above and below the gas pipeline, the stiffness and moment of inertia of the pipeline section are enhanced, and the problem of difficulty in increasing the span of the gas pipeline in the prior art is solved, and the span increase effect with a simple, low-cost and convenient structure is achieved.
Patent Information
- Application Number
- CN202421689482.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-16
AI Technical Summary
The prior art is difficult to simply and at low cost to increase the span of the gas pipeline without adding a bracket, and the existing methods have problems such as construction difficulties, high costs, and unauthorized construction periods.
The local reinforcement method is adopted, by setting up an upper reinforcement plate and a lower reinforcement plate above and below the pipeline body, which are fixedly connected to the top and bottom of the pipeline, and are fixedly connected to the pipeline body and the lower reinforcement plate through the wing plate to enhance cross-sectional stiffness and moment of inertia.
It is achieved that without adding a bracket, the span of the gas pipeline is increased by about 30%-50%, while reducing costs, simplifying the structure, and controlling the construction period.
Smart Images
Figure CN222746784U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a gas pipeline, in particular to a large-span gas pipeline structure. Background Art
[0002] With the development of social economy, municipal engineering construction in various regions is advancing rapidly, especially rail and three-dimensional transportation. Among them, there are inevitable conflicts between municipal gas pipelines and municipal road construction, and gas pipelines need to be relocated; in areas with developed river systems, it is often necessary to cross rivers, resulting in situations where the basic span is exceeded.
[0003] In order to increase the span of the gas pipeline, the commonly used methods are:
[0004] (1) Increase pipe diameter and wall thickness. For example, if the gas pipeline specification is increased by two levels to φ508×11, the span values calculated based on strength and stiffness conditions are 26.5 meters and 25.7 meters respectively. The straight span cannot meet the requirements. Whether in terms of procurement, steel consumption or operation and maintenance, it is impossible to solve the problem by increasing the pipe diameter and wall thickness.
[0005] (2) Setting up a truss to lay pipelines. This design structure is relatively grand in appearance and has high rigidity. It also requires large investment and consumables. After careful on-site investigation and analysis, it was found that the truss solution was not suitable: first, it could not meet the construction period requirements; second, there were many pipelines to be relocated on site, and multiple professional operations were carried out at the same time, resulting in insufficient space and difficulty in lifting; third, the cost was high, and the estimated cost would be twice that of laying pipe racks, and the workmanship and subsequent maintenance were troublesome.
[0006] (3) Use arched pipes to cross the bridge. Designing the steel pipe into a circular hingeless arch has very high requirements for construction and installation, and is difficult to implement in the short term. In addition, the planning department believes that the arched pipe will affect the urban landscape and is not recommended.
[0007] (4) Use a sling-type spanning structure. It consists of horizontal tie rods, slings, steel beams and independent pipe racks. Compared with the horizontal spanning structure of pipelines, it requires more steel, is difficult to construct, has a long construction period, and is economically unreasonable.
[0008] It can be seen from this that the existing technologies cannot simultaneously increase the span of the gas pipeline with a simple structure, low cost and convenience, and the gas pipeline structure needs to be improved. Utility Model Content
[0009] The purpose of the utility model is to overcome the above-mentioned problems and provide a large-span gas pipeline structure, which has the advantages of large span, simple structure, low cost, easy manufacturing, etc.
[0010] The purpose of the utility model is achieved through the following technical solutions:
[0011] A long-span gas pipeline structure comprises a pipeline body and a reinforcement structure;
[0012] The reinforcement structure includes an upper reinforcement plate and / or a lower reinforcement plate;
[0013] The upper reinforcing plate is arranged above the pipe body, and the bottom of the upper reinforcing plate is fixedly connected to the top of the pipe body;
[0014] The lower reinforcing plate is vertically arranged below the pipe body, and the top of the lower reinforcing plate is fixedly connected to the bottom of the pipe body;
[0015] The length directions of the upper reinforcing plate and the lower reinforcing plate are both parallel to the axial direction of the pipe body.
[0016] In a preferred embodiment of the present invention, a wing plate is provided at the bottom of the pipe body, and the wing plates are provided in multiple groups and are evenly arranged along the axial direction of the pipe body;
[0017] Each set of wing plates includes two wing plates symmetrically arranged on both sides of the lower reinforcing plate; the wing plates are fixedly connected to the pipeline body and the lower reinforcing plate at the same time; the plate surface of the wing plates is perpendicular to the axial direction of the pipeline body. Through the above structure, the connection strength between the lower reinforcing plate and the pipeline body can be improved, which is conducive to further increasing the span.
[0018] Furthermore, the wing plate is welded to the pipe body and the lower reinforcement plate by a double-sided fillet welding process.
[0019] In a preferred embodiment of the present invention, two upper reinforcing plates are provided and are symmetrically arranged; the gap between the two upper reinforcing plates gradually increases from bottom to top.
[0020] In a preferred embodiment of the present invention, the length of the upper reinforcing plate or the lower reinforcing plate is smaller than the length of the lower pipe body.
[0021] In a preferred embodiment of the utility model, the upper reinforcing plate or the lower reinforcing plate is welded to the pipeline body by a double-sided symmetrical intermittent welding process, and spot welding is not allowed, and reverse segment welding is required.
[0022] A preferred solution of the utility model is that the gap between the pipeline body and the reinforcement structure where no welds are made is filled with epoxy mortar, and other damaged 3PE anti-corrosion layers are filled with epoxy mortar for anti-corrosion.
[0023] In a preferred embodiment of the present invention, the pipeline body and the reinforcement structure are wrapped with a protective layer for preventing ultraviolet rays and solar radiation, for example, by wrapping with aluminum foil.
[0024] Compared with the prior art, the utility model has the following beneficial effects:
[0025] 1. The large-span gas pipeline structure of the utility model adopts a local reinforcement method without adding brackets. Local reinforcement plates are used to strengthen the cross-section of the parts with large forces, so that the moment of inertia and stiffness of the cross-section are increased, thereby achieving the purpose of increasing the span.
[0026] 2. A lower reinforcement plate is arranged below the pipeline body, which has the advantages of simple structure, low cost and easy manufacturing.
[0027] 3. Calculations show that the reinforcement plate consumables are less than 10% of the pipe mass and increase the span by about 30%-50%. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a front view of a first specific implementation mode of the large-span gas pipeline structure of the utility model.
[0029] Figure 2 It is a side view of a first specific implementation mode of the large-span gas pipeline structure of the utility model.
[0030] Figure 3 This is a parameter diagram of the pipe body and the lower reinforcement plate of the first specific implementation mode of the utility model.
[0031] Figure 4 It is a front view of a second specific implementation manner of the large-span gas pipeline structure of the utility model. DETAILED DESCRIPTION
[0032] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described below in conjunction with embodiments and drawings, but the implementation methods of the utility model are not limited thereto.
[0033] Example 1
[0034] See also Figure 1-2 The large-span gas pipeline structure of this embodiment includes a pipeline body 1 and a reinforcement structure; the reinforcement structure includes a lower reinforcement plate 2; the lower reinforcement plate 2 is vertically arranged below the pipeline body 1, and the top of the lower reinforcement plate 2 is fixedly connected to the bottom of the pipeline body 1; the length direction of the lower reinforcement plate 2 is parallel to the axial direction of the pipeline body 1.
[0035] See also Figure 1-2The bottom of the pipe body 1 is provided with wing plates 3, which are provided in multiple groups and are evenly arranged along the axial direction of the pipe body 1; each group of wing plates 3 includes two wing plates 3 symmetrically arranged on both sides of the lower reinforcing plate 2; the wing plates 3 are fixedly connected to the pipe body 1 and the lower reinforcing plate 2 at the same time; the plate surface of the wing plates 3 is perpendicular to the axial direction of the pipe body 1. Through the above structure, the connection strength between the lower reinforcing plate 2 and the pipe body 1 can be improved, which is conducive to further increasing the span.
[0036] Furthermore, the wing plate 3 is welded to the pipe body 1 and the lower reinforcing plate 2 by a double-sided fillet welding process.
[0037] See also Figure 1-2 , the length of the lower reinforcing plate 2 is smaller than the length of the lower pipe body 1.
[0038] Furthermore, the lower reinforcing plate 2 is welded to the bottom center of the pipeline body 1 by a double-sided symmetrical intermittent welding process, and spot welding is not allowed, and reverse segment welding is required.
[0039] Furthermore, the unwelded gap between the pipeline body 1 and the reinforcement structure is filled with epoxy mortar, and other damaged 3PE anti-corrosion layers are filled with epoxy mortar for corrosion protection.
[0040] Furthermore, the pipe body 1 and the reinforcement structure are wrapped with a protective layer for preventing ultraviolet rays and solar radiation, for example, by wrapping with aluminum foil.
[0041] See also Figure 3 , the following example calculation verifies the feasibility of the reinforced structure of this embodiment.
[0042] Assume that a lower reinforcement plate is welded below the mid-span range of the pipeline body, with a plate height of 300 mm and a thickness of 30 mm.
[0043] (1) Find the centroid position of the combined section:
[0044]
[0045] Where: A1 is the cross-sectional area of the pipe wall (cm 2 ), 98.902;
[0046] A2 is the cross-sectional area of the reinforcement plate (cm 2 ), 90;
[0047] y2 is the distance between the pipe and the second centroid of the reinforcing plate (cm),
[0048] D w is the outer diameter of the pipe (cm);
[0049] H is the height of the reinforcement plate (cm).
[0050] (2) Calculate the second moment of area about the neutral axis XX:
[0051]
[0052] Where: I1 is the second moment of the area of A1 about the axis X1-X1 passing through its own centroid (cm 4 ), Calculated to be 19640.051cm 4 ;
[0053] I2 is the second moment of area of A2 about the axis X2-X2 passing through its own centroid (cm 4 ),
[0054] δ is the thickness of the reinforcement plate (cm).
[0055] (3) Calculate the section bending moment about the neutral axis XX:
[0056]
[0057] (4) After adding the reinforcement plate, the span of the pipeline is:
[0058]
[0059] Where: L s To strengthen the span of the pipe support (m);
[0060] L is the span of the unreinforced pipe support (m), 22;
[0061] W s To strengthen the cross-sectional coefficient of the pipe (cm 3 );
[0062] W is the cross-sectional modulus of the unreinforced pipe (cm 3 ), Calculated to be 966.538cm 3 .
[0063] (5) After adding the reinforcement plate, the maximum allowable span of the pipeline is L max Verification
[0064] By strength: L max =29.05 meters>28 meters;
[0065] By stiffness: L max =29.97 meters>28 meters;
[0066] All are greater than 28 meters, meeting the requirements.
[0067] Example 2
[0068] See also Figure 4 , which is different from Example 1, the reinforcing structure of this embodiment is an upper reinforcing plate 4; the upper reinforcing plate 4 is arranged above the pipe body 1, and the bottom of the upper reinforcing plate 4 is fixedly connected to the top of the pipe body 1; the length direction of the upper reinforcing plate 4 is parallel to the axial direction of the pipe body 1.
[0069] Furthermore, two upper reinforcing plates 4 are provided and are symmetrically arranged; the gap between the two upper reinforcing plates 4 gradually increases from bottom to top.
[0070] Furthermore, the length of the upper reinforcing plate 4 is smaller than the length of the lower pipe body 1 .
[0071] The following example calculation is used to verify the feasibility of the reinforcement structure of this embodiment.
[0072] Suppose, two steel plates with a height of 250 mm and a thickness of 20 mm are welded above the pipeline.
[0073] (1) Find the centroid position of the combined section:
[0074]
[0075] Where: A is the cross-sectional area of the tube wall (cm 2 ), Calculated to be 98.902cm 2 ;
[0076] D w is the outer diameter of the pipe (cm), 40.64;
[0077] δ is the thickness of the reinforcement plate (cm), 2;
[0078] a is the height of the reinforcement plate (cm), 25;
[0079] α is the inclination angle of the reinforcement plate to the vertical line of the center line of the pipe section (15°).
[0080] (2) Combined cross section to X s The second moment of area:
[0081]
[0082] Where: I is the second moment of the pipe section without reinforcement plate (cm 4 ),
[0083] (3) Calculate the combined section coefficient:
[0084]
[0085] Where: e is the axis X passing through the center of gravity s sThe distance from the farthest edge of the combined section with the reinforcement plate welded to it (cm);
[0086] e=Y1+Y2+RY s =24.148+19.628+20.32-36.61=27.489(cm);
[0087] Y1=acosα=25×cos(15°)=24.148(cm);
[0088]
[0089] (4) After adding the reinforcement plate, the span of the pipeline is:
[0090]
[0091] Where: L s To strengthen the span of the pipe support (m);
[0092] L is the span of the unreinforced pipe support (m), 22 meters;
[0093] W s To strengthen the cross-sectional coefficient of the pipe (cm 3 );
[0094] W is the cross-sectional modulus of the unreinforced pipe (cm 3 ), Calculated to be 966.538cm 3 ;
[0095] (5) After adding the reinforcement plate, the maximum allowable span of the pipeline is L max Verification of:
[0096] By strength: L max =29.45 meters>28 meters;
[0097] By stiffness: L max =28.32 meters>28 meters;
[0098] Therefore, the span of the upper reinforcement plate is 28.3 meters, which meets the requirements.
[0099] Example 3
[0100] Different from Embodiments 1 and 2, the reinforcement structure of this embodiment includes both an upper reinforcement plate and a lower reinforcement plate.
[0101] The above is a preferred implementation mode of the present invention, but the implementation mode of the present invention is not limited by the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.
Claims
1. A long-span gas pipeline structure, characterized in that: It includes the pipeline body and the reinforcement structure; The reinforcement structure includes an upper reinforcement plate and / or a lower reinforcement plate; The upper reinforcing plate is arranged above the pipe body, and the bottom of the upper reinforcing plate is fixedly connected to the top of the pipe body; The lower reinforcing plate is vertically arranged below the pipe body, and the top of the lower reinforcing plate is fixedly connected to the bottom of the pipe body; The length directions of the upper reinforcing plate and the lower reinforcing plate are both parallel to the axial direction of the pipe body.
2. The long-span gas pipeline structure according to claim 1, characterized in that: The bottom of the pipe body is provided with wing plates, and the wing plates are provided in multiple groups and are evenly arranged along the axial direction of the pipe body; Each set of wing plates includes two wing plates symmetrically arranged on both sides of the lower reinforcing plate; the wing plates are fixedly connected to the pipeline body and the lower reinforcing plate at the same time; and the plate surface of the wing plates is perpendicular to the axial direction of the pipeline body.
3. The long-span gas pipeline structure according to claim 2 is characterized in that: The wing plate is welded to the pipe body and the lower reinforcing plate by using a double-sided fillet welding process.
4. The long-span gas pipeline structure according to claim 1, characterized in that: There are two upper reinforcing plates and they are symmetrically arranged; the gap between the two upper reinforcing plates gradually increases from bottom to top.
5. The long-span gas pipeline structure according to claim 1, characterized in that: The length of the upper reinforcing plate or the lower reinforcing plate is smaller than the length of the lower pipe body.
6. The long-span gas pipeline structure according to claim 1, characterized in that: The upper reinforcing plate or the lower reinforcing plate is welded to the pipeline body by adopting a double-sided symmetrical intermittent welding process.
7. The long-span gas pipeline structure according to claim 1, characterized in that: The gap between the pipeline body and the reinforcement structure where no welding is done is filled with epoxy mortar.
8. The long-span gas pipeline structure according to claim 1, characterized in that: The pipeline body and the reinforcement structure are wrapped with a protective layer that protects against ultraviolet rays and solar radiation.