Pipeline elbow fixing structure and construction method thereof

Abstract

The invention discloses a pipeline elbow fixing structure and a construction method thereof, the pipeline elbow fixing structure is applied to fixing of a flexible connector pipeline elbow or a high-pressure elbow, and the fixing structure comprises an annular plate fixed to the outer surface of the pipeline elbow; the arc-shaped base plates are distributed on the outer surface of the pipeline, and the specification and the size of each arc-shaped base plate are determined according to the diameter and the pressure bearing level of the pipeline; each rib plate is arranged perpendicular to the upper surface of the arc-shaped base plate and used for enhancing the structural strength of the arc-shaped base plate; the rib plate, the arc-shaped base plate and the annular plate are fixedly connected. According to the invention, the problem of matching between stress analysis and structural design when the elbow bears internal pressure thrust can be solved, and direct assembly type installation can be realized.

Description

Technical Field

[0001] The invention relates to the field of municipal engineering, and in particular to a pipeline elbow fixing structure and a construction method thereof. Background Art

[0002] Flexible interface pipe elbows or high-pressure elbow fixed structures are often used in pipeline installation projects in municipal engineering, chemical, petroleum, natural gas and other industries. They can better connect the pipe elbows to the pipeline system and facilitate installation and maintenance.

[0003] In the prior art, the support solutions for flexible interface pipe elbows or high-pressure elbows include setting up concrete anchors or setting up a single-piece bracket in the middle of the elbow. Setting up anchors is limited by the installation space, and the economic efficiency of civil engineering is not high. Setting up a single-piece bracket cannot fully resist the internal pressure thrust, which may cause significant deformation at the elbow and affect the safe and stable operation of the pipeline.

[0004] Common stress analysis at pipe elbows Figure 1 As shown. The resultant force at the elbow is: R = 2pAsina / 2. Among them, R is the resultant force at the elbow, p is the pressure of the fluid in the pipeline, A is the cross-sectional area of ​​the pipeline, and α represents the angle between the curved part of the elbow and the straight part. This force analysis is a typical calculation formula for the internal pressure thrust at the elbow. The characteristic of this formula is that the pipeline is simplified into a rod unit for the decomposition and synthesis of the concurrent force, without considering factors such as the external dimensions of the pipeline. Therefore, the internal pressure thrust formed at the elbow cannot be fixed only by conventional single-piece brackets.

[0005] Therefore, there is an urgent need for a pipe elbow fixing structure that can match the force analysis and structural design when the elbow is subjected to internal pressure thrust. Summary of the invention

[0006] The present invention aims to provide an integrated elbow and a fixing structure that can withstand a large internal pressure thrust, which can solve the matching problem between force analysis and structural design when the elbow is subjected to internal pressure thrust, and can be directly assembled and installed.

[0007] According to one aspect of the present invention, there is provided a pipe elbow fixing structure, which is applied to the fixing of flexible interface pipe elbows or high-pressure elbows, and comprises: a ring plate 3 fixed on the outer surface of the pipe elbow; a plurality of arc-shaped pads 6 distributed on the outer surface of the pipe, the specification and size of each arc-shaped pad 6 being determined according to the pipe diameter and the pressure level; a plurality of rib plates 5, each rib plate 5 being arranged perpendicular to the upper surface of the arc-shaped pad 6, for enhancing the structural strength of the arc-shaped pad 6; the rib plates 5, the arc-shaped pad 6 and the ring plate 3 are firmly welded.

[0008] Preferably, the pipe elbow fixing structure also includes: an upper beam 2-1, connected to the upper end of the ring plate 3; a lower beam 2-2, connected to the lower end of the ring plate 3, and the upper beam 2-1 and the lower beam 2-2 are hollow square steel beams; a column 4, connected to the two side edges of the ring plate 3; a lifting lug 1, arranged in the middle of the top of the upper beam 2-1, for lifting operations; a base plate 9, fixing the connection between the column 4 and the ground by chemical anchor bolts.

[0009] Preferably, the interface of the elbow 7 is a flange 8, and the flange 8 is connected to the straight pipes at both ends of the elbow 7 by bolts. The specification size and pressure level of the flange 8 are determined according to the specification and design pressure of the pipeline, and the pressure level is not less than PN16.

[0010] Preferably, the elbow 7 is made of carbon steel or stainless steel, its bending radius is 1.5D or above, and its angle range is 0 to 90 degrees; the material of the arc pad 6 is determined according to the material of the elbow 7 to ensure weldability and corrosion resistance; the upper beam 2-1, the lower beam 2-2, and the column 4 are made of Q235B hot-dip galvanized steel.

[0011] According to another aspect of the present invention, a construction method for a pipe elbow fixing structure is provided, which is suitable for fixing a flexible interface pipe elbow or a high-pressure elbow, comprising: constructing a ring plate 3 to fix it on the outer surface of the pipe elbow; installing a plurality of arc-shaped pads 6 distributed on the outer surface of the pipe, the size of each arc-shaped pad 6 being determined according to the diameter of the pipe; installing a plurality of rib plates 5, each rib plate 5 being arranged perpendicular to the upper surface of the arc-shaped pad 6, for enhancing the structural strength of the arc-shaped pad 6; and fixing the rib plate 5, the arc-shaped pad 6 and the ring plate 3 in connection.

[0012] Preferably, the construction method also includes: constructing an upper beam 2-1 connected to the upper end of the ring plate 3; constructing a lower beam 2-2 connected to the lower end of the ring plate 3, and the upper beam 2-1 and the lower beam 2-2 are hollow square steel beams; constructing a column 4 connected to the two side edges of the ring plate 3; installing a lifting lug 1, which is set in the middle of the top of the upper beam 2-1 for lifting operations; constructing a base plate 9, fixing the connection between the column 4 and the ground by chemical anchor bolts, and the anchoring depth of the chemical anchor bolts is calculated and determined according to the stress conditions.

[0013] Preferably, a flange 8 is constructed at the interface of the elbow 7, and the flange 8 is connected to the straight pipes at both ends of the elbow 7 by bolts. The size and pressure level of the flange 8 are determined according to the pipeline, and the pressure level is not less than PN16.

[0014] Preferably, the material of the elbow 7 is carbon steel or stainless steel, the bending radius is 1.5D or above, and the angle range is 0 to 90 degrees; the material of the arc pad 6 is selected according to the material of the elbow 7 to ensure weldability and corrosion resistance; the material of the upper beam 2-1, the lower beam 2-2, and the column 4 is selected to be Q235B hot-dip galvanized steel.

[0015] Preferably, a static water pressure of not less than 1.0 MPa and a dynamic water pressure caused by a flow velocity V of not less than 1.0 MPa and not less than 1.0 MPa are applied from the inside of the pipeline. The flow velocity V is provided by hydraulic calculation of the pipeline system and is used to check the strength and stability of the pipe elbow fixing structure.

[0016] The present invention discloses a pipe elbow fixing structure and a construction method thereof, which are applied to the fixing of high-pressure elbows in pipe gallery structures, and the fixing structure comprises: a ring plate 3 fixed on the outer surface of the pipe elbow; a plurality of arc-shaped pads 6 distributed on the outer surface of the pipe, and the specification and size of each arc-shaped pad 6 are determined according to the diameter of the pipe and the pressure-bearing level; a plurality of rib plates 5, each rib plate 5 is respectively arranged perpendicular to the upper surface of the arc-shaped pad 6, and is used to enhance the structural strength of the arc-shaped pad 6; the rib plate 5, the arc-shaped pad 6 and the ring plate 3 are fixedly connected. The present invention can solve the matching problem between the force analysis and the structural design when the elbow is subjected to the internal pressure thrust, and can be directly assembled and installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 This is a common force analysis diagram for pipe elbows;

[0019] Figure 2 A schematic diagram of a pipe elbow fixing structure according to an embodiment of the present invention;

[0020] Figure 3 It is a three-dimensional effect diagram of the pipeline elbow fixing structure according to an embodiment of the present invention.

[0021] In the figure: 1, lifting ear; 2-1, upper crossbeam; 2-2, lower crossbeam; 3, ring plate; 4, column; 5, rib plate; 6, arc pad; 7, elbow; 8, flange; 9, bottom plate. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. For ease of interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0024] An embodiment of the present invention provides a pipe elbow fixing structure, which is used for fixing flexible interface pipe elbows or high-pressure elbows, including: a ring plate 3, fixed on the outer surface of the pipe elbow; a plurality of arc-shaped pads 6, distributed on the outer surface of the pipe, and the specifications and dimensions of each arc-shaped pad 6 are determined according to the pipe diameter and the pressure level; a plurality of rib plates 5, each rib plate 5 is arranged perpendicular to the upper surface of the arc-shaped pad 6, for enhancing the structural strength of the arc-shaped pad 6; the rib plates 5, the arc-shaped pad 6 and the ring plate 3 are fixedly connected.

[0025] In the embodiment of the present invention, a steel bracket is used instead of a concrete anchor pier, which can withstand a large internal pressure thrust of a high-pressure elbow and save installation space. The specifications and dimensions of the arc pad 6 are determined according to the pipeline diameter and the pressure level: since the contact surface between the ring plate and the pipeline is small, the equivalent stress of the local steel is likely to exceed the allowable stress when the internal pressure is large, so the local stress can be effectively reduced by adding a reinforcement plate (i.e., an arc pad) locally. The arc pad is determined by means of finite element analysis.

[0026] According to an embodiment of the present invention, the pipe elbow fixing structure also includes: an upper beam 2-1, connected to the upper end of the ring plate 3; a lower beam 2-2, connected to the lower end of the ring plate 3, the upper beam 2-1 and the lower beam 2-2 are hollow square steel beams; a column 4, connected to the two side edges of the ring plate 3; a lifting lug 1, arranged in the middle of the top of the upper beam 2-1, for lifting operations; a base plate 9, fixing the connection between the column 4 and the ground by chemical anchor bolts.

[0027] In the embodiment of the present invention, during on-site installation, it is only necessary to anchor the chemical anchor bolts and connect the flanges at both ends of the elbow with bolts, so the installation operation is simple and quick.

[0028] According to an embodiment of the present invention, the interface of the elbow 7 is a flange 8, and the flange 8 is connected to the straight pipes at both ends of the elbow 7 by bolts. The specification, size and pressure level of the flange 8 are determined according to the specification and design pressure of the pipeline, and the pressure level is not less than PN16.

[0029] In the embodiment of the present invention, the pipeline and the fixed structure are integrally modeled during design, and static water pressure and dynamic water pressure are applied from inside the pipeline to check the strength and stability of the pipeline and the fixed structure, thereby avoiding the error of directly applying point loads on conventional fixed structures.

[0030] According to an embodiment of the present invention, the elbow 7 is made of carbon steel or stainless steel, its bending radius is 1.5D or above, and its angle range is 0 to 90 degrees; the material of the arc pad 6 is determined according to the material of the elbow 7 to ensure weldability and corrosion resistance; the upper beam 2-1, the lower beam 2-2, and the column 4 are made of Q235B hot-dip galvanized steel.

[0031] In the embodiment of the present invention, the fixed structure can ensure the safe and stable operation of the elbow, achieve the effect of concrete anchoring pier and save installation space, and its material also has good corrosion resistance, which can improve the durability of the elbow.

[0032] Another embodiment of the present invention provides a construction method for a pipe elbow fixing structure, which is suitable for fixing flexible interface pipe elbows or high-pressure elbows, including: constructing a ring plate 3 to fix it on the outer surface of the pipe elbow; installing a plurality of arc-shaped pads 6 distributed on the outer surface of the pipe, and the size of each arc-shaped pad 6 is determined according to the diameter of the pipe; installing a plurality of rib plates 5, each rib plate 5 is arranged perpendicular to the upper surface of the arc-shaped pad 6, for enhancing the structural strength of the arc-shaped pad 6; and fixing the rib plate 5, the arc-shaped pad 6 and the ring plate 3 in connection.

[0033] According to an embodiment of the present invention, the construction method also includes: constructing an upper beam 2-1 connected to the upper end of the ring plate 3; constructing a lower beam 2-2 connected to the lower end of the ring plate 3, and the upper beam 2-1 and the lower beam 2-2 are hollow square steel beams; constructing a column 4 connected to the two side edges of the ring plate 3; installing a lifting lug 1, which is set in the middle of the top of the upper beam 2-1 for lifting operations; constructing a base plate 9, fixing the connection between the column 4 and the ground by chemical anchor bolts, and the anchoring depth of the chemical anchor bolts is calculated and determined according to the stress conditions.

[0034] According to an embodiment of the present invention, a flange 8 is constructed at the interface of the elbow 7. The flange 8 is connected to the straight pipes at both ends of the elbow 7 by bolts. The size and pressure level of the flange 8 are determined according to the pipeline, and the pressure level is not less than PN16.

[0035] According to an embodiment of the present invention, the material of the elbow 7 is selected to be carbon steel or stainless steel, the bending radius is 1.5D or above, and the angle range is 0 to 90 degrees; the material of the arc pad 6 is selected according to the material of the elbow 7 to ensure weldability and corrosion resistance; the material of the upper beam 2-1, the lower beam 2-2, and the column 4 is selected to be Q235B hot-dip galvanized steel.

[0036] According to an embodiment of the present invention, a static water pressure of not less than 1.0 MPa and a dynamic water pressure caused by a flow velocity V (the flow velocity V is provided by hydraulic calculation of the pipe system) are applied from the inside of the pipe to verify the strength and stability of the pipe elbow fixing structure.

[0037] The method of the present invention is further described in detail below in conjunction with specific implementation modes and drawings.

[0038] Figure 2 Schematic diagram of the pipe elbow fixing structure according to an embodiment of the present invention. Figure 2 As shown, the main components of the present invention include: national standard steel elbows (bending radius is 1.5D or above), steel straight pipes, arc pads, rib plates, ring plates, beams, columns, lifting ears, base plates, chemical anchors, national standard steel flanges and matching connecting bolts.

[0039] The elbow generally adopts a bending radius of 1.5D or more, and a steel straight pipe section is extended at each end. Eight arc pads are welded around the elbow and the straight pipe sections at both ends, and each arc pad has a rib plate. The rib plate and arc pad are welded to the ring plate, and there are hollow square steel beams above and below the ring plate. The upper beam of the ring plate is welded with a lifting lug to facilitate the lifting operation during installation. The upper and lower beams and the ring plate are welded to the columns, and the columns are connected with steel sections. There is a bottom plate under each column, and the bottom plate and the pipe gallery structure are anchored with chemical anchor bolts.

[0040] The present invention includes the following beneficial effects:

[0041] 1. The present invention can be applied to the elbows of underground integrated pipe galleries or other overhead pipelines where the internal pressure thrust is large.

[0042] 2. The present invention can be applied to fixation of pipe elbows connected with flexible interfaces.

[0043] 3. The present invention can be selected under the condition that the space is limited and the concrete anchor pier cannot be set, and the water supply and drainage safety can be ensured.

[0044] 4. The present invention can realize non-fire operation in the limited space of the pipe gallery and direct assembly installation.

[0045] The above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications may be made based on the following description, and these various changes, modifications, substitutions and deformations derived from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A pipe elbow fixing structure, used for fixing flexible interface pipe elbows or high-pressure elbows, characterized in that: include: A ring plate (3) fixed on the outer surface of the pipe elbow; A plurality of arc-shaped pads (6) are distributed on the outer surface of the pipeline, and the specification and size of each arc-shaped pad (6) are determined according to the diameter of the pipeline and the pressure level; A plurality of rib plates (5), each rib plate (5) being arranged perpendicular to the upper surface of the arc-shaped pad (6) and used for enhancing the structural strength of the arc-shaped pad (6); The rib plate (5), the arc-shaped pad plate (6) and the ring plate (3) are fixedly connected.

2. The pipeline elbow fixing structure according to claim 1, characterized in that: Also includes: An upper cross beam (2-1) connected to the upper end of the ring plate (3); A lower cross beam (2-2) is connected to the lower end of the ring plate (3); the upper cross beam (2-1) and the lower cross beam (2-2) are hollow square steel cross beams; A column (4) connected to two side edges of the ring plate (3); A lifting lug (1) is arranged in the middle of the top of the upper crossbeam (2-1) and is used for lifting operations; The base plate (9) is used to fix the connection between the upright column (4) and the ground via chemical anchor bolts.

3. The pipeline elbow fixing structure according to claim 2 is characterized in that: The interface of the elbow (7) is a flange (8), and the flange (8) is connected to the straight pipes at both ends of the elbow (7) by bolts. The specification size and pressure level of the flange (8) are determined according to the specification and design pressure of the pipeline, and the pressure level is not less than PN16.

4. The pipeline elbow fixing structure according to claim 3 is characterized in that: The elbow (7) is made of carbon steel or stainless steel, has a bending radius of 1.5D or more, and an angle range of 0 to 90 degrees; The material of the arc-shaped pad (6) is determined according to the material of the elbow (7) to ensure weldability and corrosion resistance; The upper crossbeam (2-1), the lower crossbeam (2-2) and the column (4) are made of Q235B hot-dip galvanized steel.

5. A construction method for a pipe elbow fixing structure, suitable for fixing a flexible interface pipe elbow or a high-pressure elbow, characterized in that: include: constructing a ring plate (3) so as to fix it on the outer surface of the pipe elbow; Installing a plurality of arc-shaped pads (6) distributed on the outer surface of the pipeline, the size of each arc-shaped pad (6) being determined according to the diameter of the pipeline; Installing a plurality of rib plates (5), each rib plate (5) being arranged perpendicular to the upper surface of the arc-shaped pad (6) to enhance the structural strength of the arc-shaped pad (6); The rib plate (5), the arc-shaped pad plate (6) and the ring plate (3) are fixedly connected.

6. The construction method according to claim 5, characterized in that: Also includes: constructing an upper crossbeam (2-1) connected to the upper end of the ring plate (3); A lower cross beam (2-2) is constructed and connected to the lower end of the ring plate (3), wherein the upper cross beam (2-1) and the lower cross beam (2-2) are hollow square steel cross beams; Construction columns (4) connected to both sides of the ring plate (3); An installation lug (1) is arranged in the middle of the top of the upper crossbeam (2-1) and is used for lifting operations; A construction base plate (9) is constructed to fix the connection between the column (4) and the ground via chemical anchor bolts, wherein the anchoring depth of the chemical anchor bolts is calculated and determined according to the stress conditions.

7. The construction method according to claim 6, characterized in that: A flange (8) is constructed at the interface of the elbow (7), and the flange (8) is connected to the straight pipes at both ends of the elbow (7) by bolts. The size and pressure level of the flange (8) are determined according to the pipeline, and the pressure level is not less than PN16.

8. The construction method according to claim 6 or 7, characterized in that: The material of the elbow (7) is selected to be carbon steel or stainless steel, the bending radius is 1.5D or more, and the angle range is 0 to 90 degrees; The material of the arc-shaped pad (6) is selected according to the material of the elbow (7) to ensure weldability and corrosion resistance; The material of the upper crossbeam (2-1), the lower crossbeam (2-2) and the column (4) is selected to be Q235B hot-dip galvanized steel.

9. The construction method according to claim 8, characterized in that: A static water pressure of not less than 1.0 MPa and a dynamic water pressure caused by a flow velocity V are applied from the inside of the pipeline. The flow velocity V is provided by hydraulic calculation of the pipe system and is used to check the strength and stability of the pipe elbow fixing structure.

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