CN114151616B - Method for reducing torsional displacement of urban heat supply pipeline fixed pier - Google Patents

Method for reducing torsional displacement of urban heat supply pipeline fixed pier Download PDF

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Publication number
CN114151616B
CN114151616B CN202111499431.3A CN202111499431A CN114151616B CN 114151616 B CN114151616 B CN 114151616B CN 202111499431 A CN202111499431 A CN 202111499431A CN 114151616 B CN114151616 B CN 114151616B
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China
Prior art keywords
fixed pier
pier
fixed
water supply
soil body
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CN202111499431.3A
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CN114151616A (en
Inventor
费兴彪
曹海莹
张昌盛
王平
陆法潭
蒋正义
崔鹏
袁朔
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Shen Kan Engineering and Technology Corp of MCC
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Shen Kan Engineering and Technology Corp of MCC
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
    • F16L3/12—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing comprising a member substantially surrounding the pipe, cable or protective tubing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/22—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals
    • F16L3/237—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals for two pipes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

A method for reducing torsional displacement of an urban heat supply pipeline fixed pier comprises the following steps: determining the horizontal axial force N of the water supply pipe according to the external load applied by the fixed pier 1 And horizontal axial force N of return pipe 2 And N 1 ＞N 2 The method comprises the steps of carrying out a first treatment on the surface of the When determining the arrangement scheme of the water supply pipe and the water return pipe in the fixed pier, firstly adopting symmetrical pipeline structural design, and then passing through the formula N 1 /N 2 The distance w between the neutral axis of the fixed pier and the edge of the water supply side of the fixed pier under the symmetrical pipeline structure is calculated, and the distance u between the neutral axis of the fixed pier and the edge of the water return side of the fixed pier under the symmetrical pipeline structure is calculated; wherein d is the width of the fixed pier; determining local soil body influenced by the passive soil pressure around the fixed pier, reinforcing the local soil body, and increasing the passive soil pressure of the local soil body so as to improve the constraint force of the local soil body on the fixed pier; the symmetrical pipeline structure design is adjusted to the asymmetrical pipeline structure design, so that the neutral axis of the fixed pier coincides with the central line.

Description

Method for reducing torsional displacement of urban heat supply pipeline fixed pier
Technical Field
The invention belongs to the technical field of municipal pipeline engineering, and particularly relates to a method for reducing torsional displacement of a fixed pier of a municipal heat supply pipeline.
Background
As shown in fig. 1 to 3, since the city heat supply pipe fixing pier adopts a double pipe arrangement structure in which the water supply pipe and the water return pipe are parallel, horizontal axial forces in different directions are generated by the water supply pipe and the water return pipe when the city heat supply pipe normally works. Because the horizontal axial force generated by the water supply pipe and the horizontal axial force generated by the water return pipe do not act on the same straight line, when the horizontal axial force generated by the water supply pipe and the water return pipe acts on the fixed pier at the same time, torsion moment is generated on the fixed pier. In addition, because the soil body around the fixed pier belongs to a non-rigid body, when the fixed pier is subjected to torsional moment, the fixed pier can be caused to generate torsional displacement. Moreover, because the horizontal axial force generated by the water supply pipe is different from the horizontal axial force generated by the water return pipe, the neutral axis of the fixed pier is further caused to deviate, and the direct consequence is that the internal structure of the fixed pier is seriously damaged.
At present, the related research on the torsional displacement of the urban heat supply pipeline fixed pier is relatively fresh, and in the design of the urban heat supply pipeline fixed pier, the small-diameter heat supply pipeline is generally faced, so that the torsional displacement of the fixed pier is often ignored. However, as the urban process is continuously aggravated, the urban capacity is continuously enlarged, so that the traditional small-diameter heat supply pipeline is difficult to meet urban heat supply requirements, and the large-diameter and high-pressure heat supply pipeline is increasingly adopted, so that the torsion displacement problem of the fixed pier is more serious.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a method for reducing the torsional displacement of the urban heat supply pipeline fixed pier, which effectively makes up the defects in the design of the existing urban heat supply pipeline fixed pier, adopts an asymmetric pipeline structure design on one hand, ensures that the central line of the fixed pier coincides with a neutral axis, reduces the torsional displacement of the fixed pier and simultaneously increases the overall stability of the fixed pier; on the other hand, the local soil around the fixed pier is reinforced, so that the passive soil pressure is improved, the constraint force of the soil on the fixed pier is further improved, and the torsion displacement of the fixed pier is further reduced.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a method for reducing torsional displacement of an urban heat supply pipeline fixed pier comprises the following steps:
step one: determining the horizontal axial force N of the water supply pipe according to the external load applied by the fixed pier 1 And horizontal axial force N of return pipe 2 And N 1 ＞N 2 ；
Step two: when determining the arrangement scheme of the water supply pipe and the water return pipe in the fixed pier, firstly adopting symmetrical pipeline structural design, and then passing through the formula N 1 /N 2 The distance w between the neutral axis of the fixed pier and the edge of the water supply side of the fixed pier under the symmetrical pipeline structure is calculated, and the distance u between the neutral axis of the fixed pier and the edge of the water return side of the fixed pier under the symmetrical pipeline structure is calculated; wherein d is the width of the fixed pier;
step three: determining local soil body influenced by the passive soil pressure around the fixed pier, reinforcing the local soil body, and increasing the passive soil pressure of the local soil body so as to improve the constraint force of the local soil body on the fixed pier;
step four: and (3) adjusting the symmetrical pipeline structural design adopted in the second step into an asymmetrical pipeline structural design so that the neutral axis of the fixed pier coincides with the central line.
The invention has the beneficial effects that:
the method for reducing the torsional displacement of the urban heat supply pipeline fixed pier effectively makes up the defects in the design of the existing urban heat supply pipeline fixed pier, on one hand, the asymmetric pipeline structural design is adopted, so that the central line of the fixed pier coincides with a neutral axis, and the overall stability of the fixed pier is increased while the torsional displacement of the fixed pier is reduced; on the other hand, the local soil around the fixed pier is reinforced, so that the passive soil pressure is improved, the constraint force of the soil on the fixed pier is further improved, and the torsion displacement of the fixed pier is further reduced.
Drawings
FIG. 1 is a schematic view (perspective) of a combination of a fixed pier, a water supply pipe and a water return pipe;
FIG. 2 is a schematic view (top view) of a combination of a fixed pier, a water supply pipe and a return pipe in a symmetrical pipe structure design;
FIG. 3 is a schematic diagram of the forces applied to the pier during torsional displacement in a symmetrical pipe design;
FIG. 4 is a schematic view (top view) of a combination of a fixed pier, a water supply pipe and a water return pipe according to the method of the present invention;
FIG. 5 is a schematic diagram showing the forces applied to the pier during torsional displacement by the method of the present invention;
in the figure, 1-fixed pier, 2-water supply pipe, 3-water return pipe, 4-local soil body, A-neutral axis, B-central line and N 1 Horizontal axial force generated by water supply pipe, N 2 Horizontal axial force produced by return pipe, L 0 Center distance between water supply pipe and water return pipe in symmetrical pipeline structural design, L 1 -center distance of water supply pipe and return pipe in asymmetric pipeline structural design.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
A method for reducing torsional displacement of an urban heat supply pipeline fixed pier comprises the following steps:
step one: determining the horizontal axial force N generated by the water supply pipe 2 according to the external load applied by the fixed pier 1 1 And the horizontal axial force N generated by the return pipe 3 2 And N 1 ＞N 2 The method comprises the steps of carrying out a first treatment on the surface of the In the present embodiment, the horizontal axial force N generated against the water supply pipe 2 1 And the horizontal axial force N generated by the return pipe 3 2 The calculation and determination can be carried out according to the requirements in the technical regulations of urban direct-buried heating pipeline engineering;
step two: in determining the arrangement of the water supply pipe 2 and the water return pipe 3 in the fixed pier 1, a symmetrical pipe structure design is adopted firstly, and then the formula N is passed 1 /N 2 The distance w between the neutral axis A of the fixed pier 1 and the edge of the water supply side of the fixed pier 1 under the symmetrical pipeline structure is calculated, and the distance u between the neutral axis A of the fixed pier 1 and the edge of the water return side of the fixed pier 1 under the symmetrical pipeline structure is calculated; wherein d is the width of the fixed pier 1;
step three: the method comprises the steps that local soil bodies 4 influenced by passive soil pressure are determined around a fixed pier 1, the local soil bodies 4 are reinforced, the passive soil pressure of the local soil bodies 4 is increased, and the constraint force of the local soil bodies 4 on the fixed pier is improved; in this embodiment, the method for reinforcing the local soil body 4 may be a tamping method, a reinforcement method, or the like;
step four: and (3) adjusting the symmetrical pipeline structural design adopted in the second step into an asymmetrical pipeline structural design, so that the neutral axis A of the fixed pier 1 coincides with the central line B. In this embodiment, the water supply pipe 2 is shifted to the neutral axis a side of the fixed pier 1 until the neutral axis a of the fixed pier 1 coincides with the center line B. Specifically, in the symmetrical pipe structure design, the center distance between the water supply pipe 2 and the water return pipe 3 can be denoted as L 0 In the asymmetric pipeline design, the center distance between the water supply pipe 2 and the water return pipe 3 can be denoted as L 1 And L is 0 ＞L 1 . Because the center distance between the water supply pipe 2 and the water return pipe in the asymmetric pipeline structural design becomes smaller, the horizontal axial force N of the water supply pipe 2 1 And horizontal axial force N of return pipe 3 2 When the torsion moment is applied to the fixed pier 1, the torsion moment generated to the fixed pier 1 is correspondingly reduced, and meanwhile, the reinforced local soil body 4 is assisted, so that the torsion displacement of the fixed pier 1 can be effectively reduced, and the overall stability of the fixed pier 1 is further improved, as shown in figures 4 and 5.
The embodiments are not intended to limit the scope of the invention, but rather are intended to cover all equivalent implementations or modifications that can be made without departing from the scope of the invention.

Claims (1)

1. A method for reducing torsional displacement of an urban heat supply pipeline fixed pier is characterized by comprising the following steps:
step one: determining the horizontal axial force N of the water supply pipe according to the external load applied by the fixed pier 1 And horizontal axial force N of return pipe 2 And N 1 ＞N 2 ；
Step two: when determining the arrangement scheme of the water supply pipe and the water return pipe in the fixed pier, firstly adopting symmetrical pipeline structural design, and then passing through the formula N 1 /N 2 The distance w between the neutral axis of the fixed pier and the edge of the water supply side of the fixed pier under the symmetrical pipeline structure is calculated by the formula w/u and the formula w+u=d, and meanwhile, the neutral axis of the fixed pier and the backwater of the fixed pier under the symmetrical pipeline structure are calculatedDistance u of side edges; wherein d is the width of the fixed pier;
step three: determining local soil body influenced by the passive soil pressure around the fixed pier, reinforcing the local soil body, and increasing the passive soil pressure of the local soil body so as to improve the constraint force of the local soil body on the fixed pier;
step four: and (3) adjusting the symmetrical pipeline structural design adopted in the second step into an asymmetrical pipeline structural design so that the neutral axis of the fixed pier coincides with the central line.
CN202111499431.3A 2021-12-09 2021-12-09 Method for reducing torsional displacement of urban heat supply pipeline fixed pier Active CN114151616B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2857792C2 (en) * 1978-08-24 1985-10-03 Albert 4270 Dorsten Stewing Concrete sewer with at least one pipeline laid in it
CN204026019U (en) * 2014-08-15 2014-12-17 江苏双良新能源装备有限公司 Concentrated supply of heating in the city pipe sleeve compensator
CN107940105A (en) * 2017-12-14 2018-04-20 天津市热电设计院有限公司 Steel construction anchor block and channel steel computational methods of the channel steel connection for backwater fixed knot
WO2018145889A1 (en) * 2017-02-07 2018-08-16 A. Raymond Et Cie Scs Holding element for a duct
CN210141378U (en) * 2019-03-29 2020-03-13 天津市热电设计院有限公司 Direct-buried heat supply pipeline with different limiting and compensating structures for water supply and return pipelines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013002908B4 (en) * 2012-03-29 2020-07-16 Abb Schweiz Ag Holding part and Coriolis mass flow meter with one holding part

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2857792C2 (en) * 1978-08-24 1985-10-03 Albert 4270 Dorsten Stewing Concrete sewer with at least one pipeline laid in it
CN204026019U (en) * 2014-08-15 2014-12-17 江苏双良新能源装备有限公司 Concentrated supply of heating in the city pipe sleeve compensator
WO2018145889A1 (en) * 2017-02-07 2018-08-16 A. Raymond Et Cie Scs Holding element for a duct
CN107940105A (en) * 2017-12-14 2018-04-20 天津市热电设计院有限公司 Steel construction anchor block and channel steel computational methods of the channel steel connection for backwater fixed knot
CN210141378U (en) * 2019-03-29 2020-03-13 天津市热电设计院有限公司 Direct-buried heat supply pipeline with different limiting and compensating structures for water supply and return pipelines

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