Construction and positioning method for expansion joint at aerial L-shaped corner of high-temperature steam pipeline

Abstract

The invention discloses a method for constructing and positioning an expansion joint at an aerial L-shaped corner of a high-temperature steam pipeline, and solves the problems of how to arrange the structure of the expansion joint and how to hoist the expansion joint of the structure to a high-altitude mounting position. An expansion joint upper port pipe joint (5) is connected to a lower port of the 90-degree elbow pipe fitting (3), an expansion joint lower port pipe joint (4) is connected to an upper port of the steam conveying vertical pipe (1), and a corrugated pipe (6) is connected between the expansion joint upper port pipe joint and the expansion joint lower port pipe joint; crescent-shaped horizontal supporting plates (7) are fixedly arranged on the vertical face of the outer side of the expansion joint lower port pipe joint at equal intervals of 90 radians, and overhanging pin shafts (11) are fixedly arranged on the vertical face of the outer side of the expansion joint upper port pipe joint (5) at equal intervals of 90 radians; the outer side of the corrugated pipe (6) is movably sleeved with a rectangular pipe-shaped cover body (9), and the upper portions of the four vertical faces of the rectangular pipe-shaped cover body are each provided with a horizontal long-strip-shaped through hole.

Description

Technical Field

[0001] The invention relates to a large-diameter high-temperature steam conveying pipeline of a thermal power plant, and in particular to a construction and positioning method of an expansion joint at an L-shaped turning point in the air of a high-temperature steam pipeline. Background Art

[0002] In newly (re)built thermal power plants, some large-diameter high-temperature steam transmission pipelines are arranged in an inverted L shape, that is, the top of the large-diameter high-temperature steam transmission riser needs to be turned 90 degrees before being connected to the high-altitude horizontal steam pipeline; in order to overcome the thermal expansion of the horizontal steam pipeline, it is necessary to set an expansion joint at the top of the steam riser that can absorb the expansion in the left and right horizontal directions. The expansion joint needs to be vertically set at the top of the large-diameter high-temperature steam transmission riser to absorb the expansion of the steam pipe in the horizontal direction. How to set the structure of the expansion joint and hoist the expansion joint of the structure to the high-altitude installation position has become a technical problem that urgently needs to be solved on site. Summary of the invention

[0003] The present invention provides a method for constructing and positioning an expansion joint at an aerial L-shaped bend of a high-temperature steam pipeline, which solves the technical problem of how to set up the structure of the expansion joint and hoist the expansion joint of the structure to a high-altitude installation position.

[0004] The present invention solves the above technical problems through the following technical solutions: A structure and positioning tool for an expansion joint at an L-shaped bend in the air of a high-temperature steam pipeline, comprising a steam delivery riser and an aerial steam delivery horizontal pipe, a 90-degree elbow pipe fitting connected to the left end of the steam delivery horizontal pipe, an expansion joint upper port pipe joint connected to the lower port of the 90-degree elbow pipe fitting, an expansion joint lower port pipe joint connected to the upper port of the steam delivery riser, a corrugated pipe connected between the expansion joint upper port pipe joint and the expansion joint lower port pipe joint; and a bellows connected to the outer side of the expansion joint lower port pipe joint. Crescent-shaped horizontal support plates are fixedly provided at intervals of 90 arcs, and cantilever pins are fixedly provided at even intervals of 90 arcs on the outer side elevation of the upper end pipe joint of the expansion joint; a rectangular tubular cover is movably sleeved on the outer side of the corrugated pipe, and a horizontal long through hole is provided on the upper part of the four elevations of the rectangular tubular cover, and the outer side ends of the cantilever pins are movably provided in the corresponding horizontal long through holes; a cantilever connecting beam is fixedly connected to the crescent-shaped horizontal support plate, and the outer side end of the cantilever connecting beam is welded to the inner side elevation of the rectangular tubular cover.

[0005] Positioning basket bolts for the upper and lower ports of the expansion joint are arranged on the outer side of the rectangular tubular cover body, an upper inverted L-shaped screw is connected to the upper end of the screw sleeve of the positioning basket bolt, an inverted U-shaped hook is arranged at the top of the upper inverted L-shaped screw, and the inverted U-shaped hook is hooked to the top of the pipe joint of the upper port of the expansion joint; a lower L-shaped screw is connected to the lower end of the screw sleeve of the positioning basket bolt, a U-shaped hook is arranged at the lower end of the lower L-shaped screw, and the U-shaped hook is hooked to the bottom end of the pipe joint of the lower port of the expansion joint; an upper top screw is arranged between the upper end of the upper inverted L-shaped screw and the outer side elevation of the pipe joint of the upper port of the expansion joint, and a lower top screw is arranged between the lower end of the lower L-shaped screw and the outer side elevation of the pipe joint of the lower port of the expansion joint; the pipe joint of the upper port of the expansion joint and the pipe joint of the lower port of the expansion joint are both made of 16 mm thick carbon steel plate, and a corrugated pipe made of stainless steel with a thickness of 2 mm is arranged between the upper port and the lower port.

[0006] Positioning basket bolts for the upper and lower ports of the expansion joint are arranged on the front outer side, the left outer side, the rear outer side and the right outer side of the rectangular tubular cover body.

[0007] A method for constructing and positioning an expansion joint at an L-shaped bend in the air of a high-temperature steam pipeline comprises a steam delivery riser, an aerial steam delivery horizontal pipe, an expansion joint upper port pipe joint, an expansion joint lower port pipe joint and a bellows, wherein a 90-degree elbow pipe fitting is connected to the left end of the steam delivery horizontal pipe, and a bellows is fixedly connected between the expansion joint upper port pipe joint and the expansion joint lower port pipe joint, comprising the following steps: The first step is to fix crescent-shaped horizontal support plates at equal intervals of 90 arcs on the outer side elevation of the pipe joint at the lower end of the expansion joint; Step 2: Make a rectangular tubular cover, and process a horizontal long through hole on the upper part of the four vertical surfaces of the rectangular tubular cover; Step 3: flexibly sleeve the rectangular tubular cover on the outer side of the corrugated tube, place the lower end of the rectangular tubular cover on four crescent-shaped horizontal support plates, and weld the lower end of the rectangular tubular cover to the crescent-shaped horizontal support plates; The fourth step is to pass the cantilever pin through the horizontal long through hole and weld it to the outer side wall of the upper port pipe joint of the expansion joint, so as to complete the expansion joint at the L-shaped turn in the air of the high-temperature steam pipeline, so that the upper port of the expansion joint composed of the upper port pipe joint, the lower port pipe joint and the bellows can swing in the left and right directions or the front and back directions in the rectangular tubular cover, thereby absorbing the horizontal expansion of the L-shaped turn in the air of the high-temperature steam pipeline.

[0008] A cantilevered connecting beam is fixedly connected to the crescent-shaped horizontal supporting plate, and the outer end of the cantilevered connecting beam is welded to the inner side elevation of the rectangular tubular cover body, thereby achieving a fixed connection between the lower end of the rectangular tubular cover body and the lower port pipe joint of the expansion joint.

[0009] Step 5: Make a positioning turnbuckle bolt. Connect an upper inverted L-shaped screw to the upper end of the screw sleeve of the positioning turnbuckle bolt, and set an inverted U-shaped hook at the top of the upper inverted L-shaped screw. Connect a lower L-shaped screw to the lower end of the screw sleeve of the positioning turnbuckle bolt, and set a U-shaped hook at the lower end of the lower L-shaped screw. Step 6. Hook the inverted U-shaped hook to the top of the expansion joint upper port pipe joint; hook the U-shaped hook to the bottom of the expansion joint lower port pipe joint; set an upper top screw between the upper end of the upper inverted L-shaped screw and the outer side elevation of the expansion joint upper port pipe joint, and set a lower top screw between the lower end of the lower L-shaped screw and the outer side elevation of the expansion joint lower port pipe joint; a positioning flower basket bolt for the upper and lower ports of the expansion joint is set on the front outer side, left outer side, rear outer side and right outer side of the rectangular tubular cover; and by adjusting the four positioning flower basket bolts, the upper top screw and the lower top screw, the central axis of the expansion joint upper port pipe joint is overlapped with the central axis of the expansion joint lower port pipe joint, thereby realizing the vertical positioning of the expansion joint.

[0010] Step 7: hoist the expansion joint vertically positioned in step 6 between the top of the steam delivery riser in the air and the 90-degree elbow pipe fitting, then butt and weld the upper end pipe joint of the expansion joint to the lower end of the 90-degree elbow pipe fitting; butt and weld the lower end pipe joint of the expansion joint to the top end of the steam delivery riser; Step 8. Remove the positioning basket bolts from the lower port pipe joint and the upper port pipe joint of the expansion joint by rotating the upper inverted L-shaped screw and the lower L-shaped screw respectively, so that the upper end of the expansion joint can swing freely left and right or front and back in the rectangular tubular cover to absorb the expansion of the steam conveying horizontal pipe.

[0011] The present invention constructs an expansion joint structure at the top of a steam riser, which absorbs the expansion of a horizontal steam pipe arranged in an L shape in the air by using a vertically arranged expansion joint. The structure is simple and easy to install. Since the expansion joint is a flexible body, the expansion joint often twists during the hoisting process, resulting in the vertical center axis of the expansion joint being offset from the center axes of the upper and lower risers. The present invention develops a connection and positioning method for the positioning basket bolt and the expansion joint, which realizes the coincidence of the center lines of the upper and lower openings of the expansion joint during the hoisting process, and facilitates the operation of welding and connecting the expansion joint at high altitudes. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the positioning turnbuckle bolt of the present invention; Figure 3 It is a structural schematic diagram of the expansion joint of the present invention; Figure 4 It is a schematic structural diagram of a rectangular tubular cover body 9 of the present invention; Figure 5 It is a schematic diagram of the structure after the expansion joint of the present invention is combined with the rectangular tubular cover 9; Figure 6 yes Figure 5 AA section view in. DETAILED DESCRIPTION

[0013] The present invention is described in detail below in conjunction with embodiments: A structure and positioning tool for an expansion joint at an L-shaped bend in the air of a high-temperature steam pipeline, comprising a steam delivery riser 1 and an aerial steam delivery horizontal pipe 2, a 90-degree elbow pipe fitting 3 connected to the left end of the steam delivery horizontal pipe 2, an expansion joint upper port pipe joint 5 connected to the lower port of the 90-degree elbow pipe fitting 3, an expansion joint lower port pipe joint 4 connected to the upper port of the steam delivery riser 1, a bellows 6 connected between the expansion joint upper port pipe joint 5 and the expansion joint lower port pipe joint 4; 9 equal intervals are provided on the outer side elevation of the expansion joint lower port pipe joint 4. A crescent-shaped horizontal support plate 7 is fixedly provided at an angle of 0, and cantilever pins 11 are fixedly provided at even intervals of 90 arcs on the outer side elevation of the upper end pipe joint 5 of the expansion joint; a rectangular tubular cover body 9 is movably sleeved on the outer side of the corrugated pipe 6, and a horizontal long through hole 10 is provided on the upper part of the four elevations of the rectangular tubular cover body 9, and the outer side end of the cantilever pin 11 is movably provided in the corresponding horizontal long through hole 10; a cantilever connecting beam 8 is fixedly connected to the crescent-shaped horizontal support plate 7, and the outer side end of the cantilever connecting beam 8 is welded to the inner side elevation of the rectangular tubular cover body 9.

[0014] Positioning flower basket bolts for the upper and lower ports of the expansion joint are arranged on the outer side of the rectangular tubular cover body 9, an upper inverted L-shaped screw 13 is connected to the upper end of the screw sleeve 12 of the positioning flower basket bolt, an inverted U-shaped hook 15 is arranged at the top of the upper inverted L-shaped screw 13, and the inverted U-shaped hook 15 is hooked to the top of the pipe joint 5 of the upper port of the expansion joint; a lower L-shaped screw 14 is connected to the lower end of the screw sleeve 12 of the positioning flower basket bolt, a U-shaped hook 16 is arranged at the lower end of the lower L-shaped screw 14, and the U-shaped hook 16 is hooked to the bottom end of the pipe joint 4 of the lower port of the expansion joint; an upper top screw 17 is arranged between the upper end of the upper inverted L-shaped screw 13 and the outer side elevation of the pipe joint 5 of the upper port of the expansion joint, and a lower top screw 18 is arranged between the lower end of the lower L-shaped screw 14 and the outer side elevation of the pipe joint 4 of the lower port of the expansion joint.

[0015] Positioning basket bolts for the upper and lower ports of the expansion joint are arranged on the front outer side, the left outer side, the rear outer side and the right outer side of the rectangular tubular cover body 9.

[0016] A method for constructing and positioning an expansion joint at an aerial L-shaped bend of a high-temperature steam pipeline comprises a steam delivery riser 1, an aerial steam delivery horizontal pipe 2, an expansion joint upper port pipe joint 5, an expansion joint lower port pipe joint 4 and a bellows 6, a 90-degree elbow pipe fitting 3 is connected to the left end of the steam delivery horizontal pipe 2, and a bellows 6 is fixedly connected between the expansion joint upper port pipe joint 5 and the expansion joint lower port pipe joint 4, comprising the following steps: The first step is to fix crescent-shaped horizontal support plates 7 at equal intervals of 90 arcs on the outer side elevation of the expansion joint lower port pipe joint 4; Step 2: Make a rectangular tubular cover 9, and process a horizontal long through hole 10 on the upper part of the four vertical surfaces of the rectangular tubular cover 9; Step 3: movably sleeve the rectangular tubular cover 9 on the outer side of the corrugated tube 6, place the lower end of the rectangular tubular cover 9 on four crescent-shaped horizontal support plates 7, and weld the lower end of the rectangular tubular cover 9 to the crescent-shaped horizontal support plates 7; The fourth step is to pass the cantilever pin 11 through the horizontal long through hole 10 and weld it to the outer side wall of the upper port pipe joint 5 of the expansion joint, so as to complete the expansion joint at the L-shaped turn in the air of the high-temperature steam pipeline, so that the upper port of the expansion joint composed of the upper port pipe joint 5 of the expansion joint, the lower port pipe joint 4 of the expansion joint and the bellows 6 can swing in the left and right directions or the front and back directions in the rectangular tubular cover 9, thereby absorbing the horizontal expansion of the L-shaped turn in the air of the high-temperature steam pipeline.

[0017] A cantilevered connecting beam 8 is fixedly connected to the crescent-shaped horizontal support plate 7, and the outer end of the cantilevered connecting beam 8 is welded to the inner side elevation of the rectangular tubular cover body 9, thereby achieving a fixed connection between the lower end of the rectangular tubular cover body 9 and the lower port pipe joint 4 of the expansion joint.

[0018] Step 5: Make a positioning turnbuckle bolt. An upper inverted L-shaped screw 13 is connected to the upper end of the screw sleeve 12 of the positioning turnbuckle bolt. An inverted U-shaped hook 15 is provided at the top of the upper inverted L-shaped screw 13. A lower L-shaped screw 14 is connected to the lower end of the screw sleeve 12 of the positioning turnbuckle bolt. A U-shaped hook 16 is provided at the lower end of the lower L-shaped screw 14. Step 6. Hook the inverted U-shaped hook 15 to the top of the expansion joint upper port pipe joint 5; hook the U-shaped hook 16 to the bottom of the expansion joint lower port pipe joint 4; set an upper top screw 17 between the upper end of the upper inverted L-shaped screw 13 and the outer side elevation of the expansion joint upper port pipe joint 5, and set a lower top screw 18 between the lower end of the lower L-shaped screw 14 and the outer side elevation of the expansion joint lower port pipe joint 4; a positioning flower basket bolt for the upper and lower ports of the expansion joint is set on the front outer side, left outer side, rear outer side and right outer side of the rectangular tubular cover 9; and by adjusting the four positioning flower basket bolts, the upper top screw 17 and the lower top screw 18, the central axis of the expansion joint upper port pipe joint 5 and the central axis of the expansion joint lower port pipe joint 4 are overlapped, thereby realizing the vertical positioning of the expansion joint.

[0019] Step 7: hoist the expansion joint vertically positioned in step 6 between the top of the steam delivery riser 1 in the air and the 90-degree elbow pipe fitting 3, then butt and weld the upper end pipe joint 5 of the expansion joint to the lower end of the 90-degree elbow pipe fitting 3; butt and weld the lower end pipe joint 4 of the expansion joint to the top end of the steam delivery riser 1; Step 8. Remove the positioning basket bolts from the expansion joint lower port pipe joint 4 and the expansion joint upper port pipe joint 5 by rotating the upper inverted L-shaped screw 13 and the lower L-shaped screw 14 respectively, so that the upper end of the expansion joint can swing freely left and right or front and back in the rectangular tubular cover 9 to absorb the expansion of the steam conveying horizontal pipe 2.

Claims

1. A method for constructing and positioning an expansion joint at an L-shaped bend in the air of a high-temperature steam pipeline, comprising a steam delivery riser (1), an aerial steam delivery horizontal pipe (2), an expansion joint upper port pipe joint (5), an expansion joint lower port pipe joint (4) and a bellows (6), wherein a 90-degree elbow pipe fitting (3) is connected to the left end of the steam delivery horizontal pipe (2), and a bellows (6) is fixedly connected between the expansion joint upper port pipe joint (5) and the expansion joint lower port pipe joint (4), characterized by the following steps: The first step is to fix crescent-shaped horizontal support plates (7) at equal intervals of 90 arcs on the outer side elevation of the lower end pipe joint (4) of the expansion joint; Step 2: manufacturing a rectangular tubular cover (9), and processing a horizontal long through hole (10) on the upper part of each of the four vertical surfaces of the rectangular tubular cover (9); Step 3: movably sleeve the rectangular tubular cover (9) on the outer side of the corrugated tube (6), place the lower end of the rectangular tubular cover (9) on four crescent-shaped horizontal support plates (7), and weld the lower end of the rectangular tubular cover (9) to the crescent-shaped horizontal support plates (7); In the fourth step, the cantilever pin shaft (11) is passed through the horizontal long through hole (10) and then welded to the outer wall of the expansion joint upper port pipe joint (5), thereby completing the expansion joint at the high-temperature steam pipeline aerial L-shaped bend. The upper port of the expansion joint composed of the expansion joint upper port pipe joint (5), the expansion joint lower port pipe joint (4) and the bellows (6) can swing in the left-right direction or the front-back direction in the rectangular tubular cover (9), thereby absorbing the horizontal expansion of the high-temperature steam pipeline aerial L-shaped bend.

2. The method for constructing and positioning an expansion joint at an L-shaped bend in the air of a high-temperature steam pipeline according to claim 1, characterized in that: A cantilevered connecting beam (8) is fixedly connected to the crescent-shaped horizontal support plate (7), and the outer end of the cantilevered connecting beam (8) is welded to the inner side elevation of the rectangular tubular cover body (9), thereby achieving a fixed connection between the lower end of the rectangular tubular cover body (9) and the pipe joint (4) at the lower end of the expansion joint.

3. The method for constructing and positioning an expansion joint at an L-shaped bend in the air of a high-temperature steam pipeline according to claim 1, characterized by the following steps: Step 5: Make a positioning turnbuckle bolt. An upper inverted L-shaped screw (13) is connected to the upper end of the screw sleeve (12) of the positioning turnbuckle bolt. An inverted U-shaped hook (15) is provided at the top of the upper inverted L-shaped screw (13). A lower L-shaped screw (14) is connected to the lower end of the screw sleeve (12) of the positioning turnbuckle bolt. A U-shaped hook (16) is provided at the lower end of the lower L-shaped screw (14). Step 6: hook the inverted U-shaped hook (15) to the top of the expansion joint upper port pipe joint (5); hook the U-shaped hook (16) to the bottom of the expansion joint lower port pipe joint (4); set an upper jack screw (17) between the upper end of the upper inverted L-shaped screw (13) and the outer side elevation of the expansion joint upper port pipe joint (5), and set a lower jack screw (18) between the lower end of the lower L-shaped screw (14) and the outer side elevation of the expansion joint lower port pipe joint (4); set a positioning flower basket bolt for the upper and lower ports of the expansion joint on the front outer side, left outer side, rear outer side and right outer side of the rectangular tubular cover (9); and adjust the four positioning flower basket bolts, the upper jack screw (17) and the lower jack screw (18) so that the central axis of the expansion joint upper port pipe joint (5) coincides with the central axis of the expansion joint lower port pipe joint (4), thereby realizing the vertical positioning of the expansion joint.

4. A method for constructing and positioning an expansion joint at an L-shaped bend in the air of a high-temperature steam pipeline according to claim 3, characterized by the following steps: Step 7: hoist the expansion joint vertically positioned in step 6 between the top of the steam delivery riser (1) in the air and the 90-degree elbow pipe fitting (3); then, butt-joint the upper end pipe joint (5) of the expansion joint with the lower end of the 90-degree elbow pipe fitting (3) and weld them together; butt-joint the lower end pipe joint (4) of the expansion joint with the top end of the steam delivery riser (1) and weld them together; Step 8: Remove the positioning turnbuckle bolts from the expansion joint lower port pipe joint (4) and the expansion joint upper port pipe joint (5) by rotating the upper inverted L-shaped screw rod (13) and the lower L-shaped screw rod (14) respectively, so that the upper end of the expansion joint can swing freely left and right or front and back in the rectangular tubular cover (9), thereby absorbing the expansion of the steam conveying horizontal pipe (2).

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