An overhead pipeline structure using cantilevered outrigger piers to increase span

Abstract

The present invention discloses an overhead pipeline structure that uses cantilevered outrigger piers to increase the span, and the structure includes anchor piers located on both sides, cantilevered outrigger piers, overhead pipelines, pipeline supports, maintenance bridges located on both sides of the overhead pipelines, and expansion joints. A pipeline support is installed on both side edges of the upper part of the cantilevered outrigger piers, and the entire overhead pipeline forms a continuous beam structure with long and short spans alternating with each other; the anchor piers at both ends serve as fixed ends of the overhead pipeline, and the pipeline support is located in the middle of the overhead pipeline; the expansion joint is arranged on the cantilevered outrigger piers in the middle of the two sides, and is located in the middle of the short span; the maintenance bridge is installed on both sides of the overhead pipeline by clamps, and pedestrian inclined steps are used to connect the maintenance bridge and the cantilevered outrigger piers to form an inspection passage. The present invention effectively increases the overhead distance, can ensure the temperature expansion and contraction adjustment performance, and can facilitate pipeline repair and maintenance work.

Description

Technical Field

[0001] The present invention relates to an overhead pipeline structure used in water conservancy projects and bridge construction, in particular to an overhead pipeline structure that utilizes cantilevered outrigger piers to increase the span, and is suitable for application scenarios where the basic span is between 30 and 50 meters and there is no additional bearing structure. Background Art

[0002] In long-distance water transmission projects, it is often necessary to solve the problem of water transmission lines crossing natural or artificial obstacles such as rivers, lakes, mountain streams, canyons, and transportation routes. The existing solution is to set up inverted siphons or overhead pipelines that are staggered in space and pass under or over the obstacles. Under normal conditions, the overhead pipeline has flexible layout, relatively good operating conditions, less difficulty in actual construction, friendly environmental impact, and a wide range of applications.

[0003] The main types of overhead pipelines include pipe arch, beam pipe bridge, cable-stayed pipe bridge, etc. Among them, beam pipe bridge is the most commonly used. This method supports the pipeline on the pipe rack in the form of a continuous beam and is suitable for space spans with a support distance of less than 50m. If the span between adjacent piers is less than 30m, for pipelines with a diameter between DN300 and DN1800, the bearing capacity of the pipeline material itself can be fully utilized, the pipe rack structure can be simplified or even eliminated, and self-supporting straight steel pipes can be directly erected between adjacent piers. However, when the span between adjacent piers reaches 30 to 50m, a truss structure is required to enhance the bearing capacity of the pipeline, and the temperature deformation of long-distance pipelines and the maintenance and maintenance conditions of pipelines during operation need to be handled. However, in practice, it is often restricted by factors such as site and landscape, and when a truss structure cannot be used to strengthen the pipeline, a light structure is needed that can not only stably support the pipeline, but also properly arrange the adjustment device for temperature expansion and deformation, and take into account the maintenance and maintenance of the pipeline. Summary of the invention

[0004] In order to overcome the defect of insufficient span of existing self-supporting straight overhead steel pipes, the present invention provides an overhead pipeline structure that uses cantilevered outward-extending piers to increase the span. The structure can use the structural properties of the pipeline itself and the pipeline support to effectively increase the overhead distance between the piers, ensure the adjustment performance of the temperature expansion device, and facilitate pipeline repair and maintenance.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] An overhead pipeline structure that uses cantilevered outrigger piers to increase the span includes anchor piers located on both sides, cantilevered outrigger piers arranged within the overhead range, an overhead pipeline, a pipeline support, a maintenance bridge located on both sides of the overhead pipeline, and an expansion joint. The lower structure of the cantilevered outrigger pier includes a pile foundation, a cap, a column, and a longitudinal cap beam to transfer the vertical load downward. A pipeline support is installed on both side edges of the upper part of the cantilevered outrigger pier to support the overhead pipeline. The overhead pipeline portion between two supports on the same cantilevered outrigger pier forms a short span, and the overhead pipeline portion between adjacent cantilevered outrigger piers forms a long span. The entire overhead pipeline constitutes a continuous beam structure with alternating long and short spans; the anchor piers located on both sides serve as fixed ends of the overhead pipeline, and the pipeline support is arranged along the overhead pipeline as a simply supported support of the overhead pipeline. The force-bearing principle of the whole structure is to use the internal force of the short span on the cantilevered outrigger bridge pier to reduce the internal force in the long span, so as to increase the free span between the cantilevered outrigger bridge piers; the telescopic joint is arranged on the cantilevered outrigger bridge pier in the middle of the two banks, and is located in the middle of the short span, as a spring connection for the overhead pipelines on both sides, and the overhead pipelines between the telescopic joint and the nearest pipeline support form an outrigger cantilever structure. The lengths of the overhead pipelines on both sides of the telescopic joint are the same or the length difference of the overhead pipelines on both sides is less than 5%, so that the vertical deformation of the outrigger cantilever structure can be consistent or basically consistent, the relative displacement difference is minimal, and the adjustment performance of the telescopic joint can be fully utilized. The maintenance bridge is installed on both sides of the overhead pipeline by clamps, and the maintenance bridge and the cantilevered outrigger bridge pier are connected by pedestrian inclined steps to form an inspection channel. The maintenance bridge includes outer railings arranged on both sides of the maintenance bridge, inner railings arranged on both sides of the overhead pipeline and the maintenance bridge deck, which are used for rust removal and anti-corrosion operations of the overhead pipeline. The maintenance bridge and the overhead pipeline are connected with hoops at equal intervals. Inner railings are set between adjacent hoops and connected to the hoops by welding or bolts. The height of the inner railings should be greater than the gap between the overhead pipeline and the maintenance bridge deck to prevent people from falling.

[0007] In the above-mentioned overhead pipeline structure, the pipeline support is composed of a support ring and a support lower structure, and the support ring can move or rotate along the pipe axis on the support lower structure to eliminate the temperature deformation of the overhead pipeline. The support lower structure is connected to the cantilevered bridge pier using embedded parts.

[0008] In the above-mentioned overhead pipeline structure, the cantilevered outrigger piers are preferably arranged at equal intervals, and can also be arranged at unequal intervals near the two banks according to the actual terrain, but the distance between the cantilevered outrigger piers should be greater than the short span length; the structural dimensions and cantilever distances of the longitudinal cap beam can be exactly the same, or they can be of appropriate sizes according to needs to meet the needs of different span ranges. The pile foundation can adopt various types such as cast-in-place piles, steel pipe piles, precast concrete piles, etc. The plane shape of the pedestal can be rectangular, triangular, circular, etc. according to the arrangement of the piles. The length of the column can be adjusted according to the longitudinal slope requirements of the overhead pipeline, and the number of columns can be selected as single column, double column or multiple columns.

[0009] In the above-mentioned overhead pipeline structure, the material of the pipeline can be ordinary steel, stainless steel, fiberglass or other materials with load-bearing capacity. The pipeline support can adopt a movable mechanism in the form of sliding, roller or rotation according to the size of the axial deformation of the overhead pipeline. The expansion joint can be a corrugated or sleeve expansion joint according to the size of the thermal expansion and contraction deformation of the pipeline.

[0010] In the above-mentioned overhead pipeline structure, the anchor pier is used to fix the overhead pipeline and the steering pipe section, and can adopt a fully enclosed, semi-enclosed or open structure. The up and down traffic between the top of the fully enclosed anchor pier and the maintenance bridge can adopt a ladder with a cage, and the traffic between other types of anchor piers and the maintenance bridge can be selected in the form of a straight ladder or an inclined ladder according to the height difference.

[0011] The beneficial effects of the present invention are:

[0012] 1. The continuous beam structure with alternating long and short spans formed by cantilevered outrigger piers is used to balance the internal force of the overhead pipeline, thereby increasing the distance between the lower structures and achieving a spatial span of more than 30m between adjacent cantilevered outrigger piers;

[0013] 2. Arrange an expansion joint between the two pipe supports on the cantilevered bridge pier in the middle of the overhead pipeline, and use the overhead pipelines on both sides of the expansion joint to form an outward cantilever structure, and the characteristics of synchronous vertical deformation to ensure that there is basically no relative vertical displacement on both sides of the expansion joint. The expansion joint only needs to adjust the axial changes caused by the thermal expansion and contraction of the material caused by the summer sun exposure and the low-temperature water flow in the pipe in winter.

[0014] 3. The inspection bridges on both sides are combined with the overhead pipelines to provide an operating channel for the subsequent repair and maintenance of the overhead pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the cantilevered outward-extending bridge pier of the present invention;

[0017] Figure 3 It is an axonometric view of the expansion joint structure in the middle of the overhead pipeline of the present invention;

[0018] Figure 4 It is an axonometric diagram of the overhead pipeline and the temporary bridge for maintenance of the present invention;

[0019] Figure 5 It is an axonometric view of the town pier structure;

[0020] Figure 6 It is an axonometric drawing of the pipe support.

[0021] In the figure, 1. anchor pier, 2. cantilevered outward-extending bridge pier, 3. expansion joint, 4. overhead pipeline, 5. maintenance bridge, 6. pipeline support, 7. clamp, 8. pedestrian inclined step, 9. pile foundation, 10. pedestal, 11. column, 12. longitudinal cap beam, 13. outer railing, 14. inner railing, 15. maintenance bridge deck, 16. ladder with cage, 17. steering pipe section, 18. support ring, 19. bearing substructure, 20. bearing embedded parts. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] The present invention discloses an overhead pipeline structure that uses cantilevered outrigger piers to increase the span, comprising anchor piers 1 located on both banks, cantilevered outrigger piers 2 arranged within the overhead range, an overhead pipeline 4, and temporary bridges 5 for maintenance on both sides of the pipeline. Figure 1 Two pipe supports 6 are installed on the cantilevered bridge pier 2 to support the overhead pipe 4. A telescopic joint 3 is installed in the middle of the two supports on the cantilevered bridge pier 2 at half the span to connect the overhead pipes 4 on both sides. Figure 3 The maintenance bridge 5 is installed on both sides of the overhead pipeline 4 by using a clamp 7, and the maintenance bridge 5 is connected with the cantilevered bridge pier 2 by using a pedestrian inclined step 8.

[0024] The cantilevered bridge pier 2 includes a pile foundation 9, a cap 10, a column 11 and a longitudinal cap beam 12. Figure 2 shown.

[0025] The maintenance bridge 5 includes outer railings 13 on both sides, inner railings 14 on both sides of the pipeline, and a maintenance bridge deck 15. Figure 4 The maintenance bridge 5 and the overhead pipeline 4 are connected with hoops 7 at equal intervals, and the inner railing 14 is also connected to the hoop 7. The height of the railing should be greater than the gap between the overhead pipeline 4 and the maintenance bridge deck 15 to prevent people from falling.

[0026] The anchor 1 is used to fix the overhead pipeline 4 and the steering pipe section 17. Figure 5As shown in FIG. 8 , pedestrian inclined steps 8 are also adopted to connect the town pier 1 and the maintenance bridge 5. A ladder 16 with a cage is installed on the town pier 1 to facilitate the up and down traffic of maintenance personnel.

[0027] The pipe support 6 is composed of a support ring 18 and a support substructure 19. Figure 6 The support ring 18 can move or rotate along the pipe axis on the support substructure 19 to eliminate the temperature stress of the overhead pipeline 4. The support substructure 19 is connected to the cantilevered bridge pier 2 by using the support embedded parts 20.

[0028] The cantilevered outrigger bridge piers 2 are preferably arranged at equal intervals, or at unequal intervals according to the actual terrain; the structure and cantilever distance of the longitudinal cap beams 12 of each bridge pier can be exactly the same, or they can be of appropriate sizes according to needs to meet the needs of different spans. The pile foundation 9 can be a variety of types such as cast-in-place piles, steel pipe piles, precast concrete piles, etc. The plane shape of the cap 10 can be rectangular, triangular, circular, etc. according to the arrangement of the piles. The length of the column 11 can be adjusted according to the longitudinal slope requirements of the overhead pipeline, and the number of the columns 11 can be selected as a single column, a double column, or a plurality of columns.

[0029] The material for making the overhead pipeline 4 can be ordinary steel, stainless steel or fiberglass. The connection mechanism of the pipeline support 6 can be in the form of sliding, roller or rotation according to the deformation of the overhead pipeline 4. The expansion joint 3 in the middle of the pipeline can be a corrugated or sleeve expansion joint according to the thermal expansion and contraction deformation of the pipeline.

[0030] The town pier 1 can adopt the structure of all-inclusive type, half-inclusive type or open type. The belt cage ladder 16 can be arranged according to the terrain height difference or adopt the forms such as straight ladder, inclined ladder.

[0031] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. An overhead pipeline structure using cantilevered outrigger piers to increase span, characterized in that: It includes anchor piers located on both banks, cantilevered outrigger piers arranged within the overhead range, overhead pipelines, pipeline supports, maintenance bridges located on both sides of the overhead pipelines, and expansion joints; the lower structure of the cantilevered outrigger piers includes pile foundations, abutments, columns and longitudinal cap beams for transmitting vertical loads downward; a pipeline support is installed on both side edges of the upper part of the cantilevered outrigger pier to support the overhead pipeline; the overhead pipeline part between two supports on the same cantilevered outrigger pier forms a short span, and the overhead pipeline part between adjacent cantilevered outrigger piers forms a long span, and the entire cantilevered outrigger piers form a long span. The overhead pipeline forms a continuous beam structure with alternating long and short spans; the anchor piers on both banks serve as fixed ends of the overhead pipeline, and the pipeline support is arranged in the middle of the overhead pipeline to serve as a simply supported support of the overhead pipeline; the expansion joint is arranged on the cantilevered outward-extending pier in the middle of the two banks and is located in the middle of the short span to serve as a spring connection for the overhead pipelines on both sides, and the overhead pipeline between the expansion joint and the nearest pipeline support forms an outward-extending cantilever structure; the temporary maintenance bridge is installed on both sides of the overhead pipeline with clamps, and the temporary maintenance bridge and the cantilevered outward-extending pier are connected by pedestrian inclined steps to form an inspection passage.

2. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 1 is characterized in that: The lengths of the overhead pipelines on both sides of the expansion joint are the same or the length difference of the overhead pipelines on both sides is less than 5%.

3. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 1 is characterized in that: The maintenance bridge comprises outer railings arranged on both sides of the maintenance bridge, inner railings arranged on both sides of the overhead pipeline and a maintenance bridge deck, which are used for rust removal and anti-corrosion operations on the overhead pipeline; the maintenance bridge and the overhead pipeline are connected with hoops at equal intervals, and the inner railings are welded or bolted to the hoops.

4. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 3 is characterized in that: The height of the inner railing is greater than the gap between the overhead pipeline and the maintenance bridge deck to prevent people from falling.

5. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 1 is characterized in that: The pipeline support is composed of a support ring and a support mechanism. The support ring can move or rotate along the pipe axis on the support lower structure to eliminate the temperature stress of the overhead pipeline. The support substructure is connected to the cantilevered outward-extending bridge pier by using embedded parts.

6. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 1 is characterized in that: The cantilevered outrigger piers are arranged at equal intervals; or the cantilevered outrigger piers are arranged at unequal intervals near both banks according to the actual terrain, but the distance between the cantilevered outrigger piers is greater than the short span length.

7. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 1 is characterized in that: The pile foundation adopts cast-in-place piles, steel pipe piles, or precast concrete piles.

8. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 1 is characterized in that: The plane shape of the cap is rectangular, triangular or circular according to the arrangement of the piles.

9. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 1, characterized in that: The pipeline support adopts a sliding, roller or rotating movable mechanism according to the size of the axial deformation of the overhead pipeline; the expansion joint adopts a corrugated or sleeve expansion joint according to the size of the thermal expansion and contraction deformation of the pipeline.

10. The overhead pipeline structure for increasing the span by using cantilevered outrigger piers according to claim 1, characterized in that: The anchor pier is used to fix overhead pipelines and steering pipe sections, and adopts a fully enclosed, semi-enclosed or open structure; the up and down traffic between the top of the fully enclosed anchor pier and the maintenance bridge adopts a ladder with a protective cage, and the traffic between the semi-enclosed anchor pier or the open anchor pier and the maintenance bridge adopts a straight ladder or an inclined ladder according to the height difference.

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