Pipeline installation method in tunnel

Abstract

The embodiment of the present invention provides a method for installing a pipeline in a tunnel, which belongs to the field of pipeline engineering. The method for installing a pipeline in a tunnel includes: obtaining relevant information of the tunnel, wherein the relevant information includes straightness information, inclination information, and width information; determining the category corresponding to the tunnel according to the relevant information, wherein the category includes a first tunnel category and a second tunnel category; determining the pipeline installation strategy corresponding to the category according to the correspondence between the pre-stored tunnel category and the pipeline installation strategy, wherein the pipeline installation strategy includes welding by automatic welding, and the pipeline installation strategy includes a first strategy corresponding to the first tunnel category and a second strategy corresponding to the second tunnel category, the first strategy adopts a welding method outside the tunnel, and the second strategy adopts a welding method inside the tunnel; installing the pipeline in the tunnel according to the pipeline installation strategy corresponding to the category. The embodiment of the present invention can realize the automatic welding process of the pipeline passing through the tunnel.

Description

Technical Field

[0001] The invention relates to the field of pipeline engineering, and in particular to a method for installing a pipeline in a tunnel. Background Art

[0002] At present, during the installation of pipelines, especially in tunnels, multiple pipe sections need to be assembled and welded. The existing welding process usually adopts manual welding or semi-automatic welding. If manual welding is adopted, the construction efficiency is low, and if semi-automatic welding is adopted, quality problems such as welding cracks are prone to occur. Therefore, the automatic welding construction process for pipelines passing through tunnels needs to be solved urgently. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a method for installing a pipeline in a tunnel to solve one or more problems existing in the above-mentioned prior art.

[0004] In order to achieve the above object, an embodiment of the present invention provides a method for installing a pipeline in a tunnel, comprising:

[0005] Obtain relevant information of the tunnel, wherein the relevant information includes curvature information, inclination information, and width information;

[0006] Determine the category corresponding to the tunnel according to the relevant information, wherein the category includes a first tunnel category and a second tunnel category, the first tunnel category is a tunnel category without a slope change point and a turning point, an inclination angle less than a preset inclination angle, and a width less than a preset width threshold, and the second tunnel category is a tunnel category with a slope change point and / or a turning point, and a width greater than or equal to a preset width threshold, the slope change point is a position where the tunnel turns in the longitudinal direction, and the turning point is a position where the tunnel turns in the transverse direction;

[0007] According to the pre-stored correspondence between the tunnel category and the pipeline installation strategy, the pipeline installation strategy corresponding to the category is determined according to the category, wherein the pipeline installation strategy includes welding by automatic welding, and the pipeline installation strategy includes a first strategy corresponding to the first tunnel category and a second strategy corresponding to the second tunnel category, the first strategy adopts the method of welding outside the tunnel, and the second strategy adopts the method of welding inside the tunnel;

[0008] Pipeline installation is carried out in the tunnel according to the pipeline installation strategy corresponding to the category.

[0009] In an embodiment of the present invention, the pipeline installation is performed on the tunnel according to the pipeline installation strategy corresponding to the category, including:

[0010] Determine that the pipeline installation strategy corresponding to the category is the first strategy;

[0011] A welding platform and a first winch are arranged at a tunnel opening at a higher position in the tunnel, and a second winch is arranged at a tunnel opening at a lower position in the tunnel, wherein the inclination angle of the welding platform is equal to the inclination angle of the tunnel;

[0012] The pipe sections are welded sequentially on the assembly welding platform by automatic welding to obtain welded pipe sections;

[0013] The welded pipe sections are transported into the tunnel by a transport vehicle in cooperation with the first winch and the second winch to achieve pipeline installation in the tunnel.

[0014] In an embodiment of the present invention, the transport vehicle comprises a rail vehicle, and rails are laid at the bottom of the tunnel.

[0015] In the embodiment of the present invention, before the welded pipe section is transported into the tunnel by the rail vehicle in cooperation with the first hoist and the second hoist, the method further includes:

[0016] The welded pipe section is subjected to at least one of the following processes: weld joint detection, anti-corrosion joint patching, and sandblasting and rust removal.

[0017] In the embodiment of the present invention, the preset inclination angle is 15°.

[0018] In the embodiment of the present invention, the length of the welding platform ranges from 28 to 75 m, the height of the welding platform does not exceed 6 m, and the width of the welding platform ranges from 10 to 16 m.

[0019] In an embodiment of the present invention, the welded pipe section is transported into the tunnel by a transport vehicle in cooperation with a first winch and a second winch, including:

[0020] The welded pipe section is placed on a rail car. One end of the rail car is connected to the wire rope of the first winch through a first hosting head, and the other end of the rail car is connected to the wire rope of the second winch through a second hosting head. The first winch and the second winch are started to drag the rail car into the tunnel along the track.

[0021] In an embodiment of the present invention, the pipeline installation is performed on the tunnel according to the pipeline installation strategy corresponding to the category, including:

[0022] Determine that the pipeline installation strategy corresponding to the category is the second strategy;

[0023] Make sure the tunnel includes a grade change or turning point;

[0024] A pipe entry platform is provided at both ends of the tunnel, wherein the pipe entry platform includes a winch, and a track is laid at the bottom of the tunnel;

[0025] The steering joint is transported from one end of the tunnel to the inside of the tunnel by means of a rail car and a winch until the steering joint reaches the slope change point or the turning point;

[0026] The pipe sections are transported from both ends of the tunnel to both sides of the steering joint in sequence by rail cars;

[0027] After all the pipe sections arrive in the tunnel, they are welded by automatic welding to realize the pipeline installation in the tunnel.

[0028] In the embodiment of the present invention, the inclination angle ranges of the sub-tunnels on both sides of the slope change point or the turning point of the tunnel include 0-28° and 0-15° respectively.

[0029] In an embodiment of the present invention, after the pipe sections are transported from both ends of the tunnel to both sides of the steering joint in sequence by a rail vehicle, the method further includes:

[0030] Temporary supports are set up under the pipe sections to support the pipe sections, and the rail car is withdrawn before the next temporary support is installed until the pipe laying of all pipe sections is completed.

[0031] In the embodiment of the present invention, it also includes: after all the pipe sections are welded, pipe supports are arranged at preset intervals in the tunnel to support the pipe.

[0032] In the embodiment of the present invention, the preset distance ranges from 15 to 25 m.

[0033] The above-mentioned method for installing a pipeline in a tunnel obtains relevant information about the tunnel, including straightness information, inclination information, and width information, and determines the corresponding category of the tunnel according to the relevant information. The first tunnel category is a tunnel category without a slope change point and a turning point, with an inclination less than a preset inclination and a width less than a preset width threshold. The second tunnel category is a tunnel category with a slope change point and / or a turning point and a width greater than or equal to a preset width threshold. According to the correspondence between the pre-stored tunnel category and the pipeline installation strategy, the pipeline installation strategy corresponding to the category is determined according to the category. The pipeline installation strategy includes welding by automatic welding. The first tunnel category corresponds to the first strategy, and the second tunnel category corresponds to the second strategy. Then, the tunnel is installed with the pipeline installation strategy corresponding to the category. The above-mentioned scheme determines the category of the tunnel according to the characteristics of the tunnel, and then selects the corresponding pipeline installation strategy according to the category of the tunnel. The pipeline installation strategy adopts a fully automatic welding method for welding, which can avoid problems such as low construction efficiency caused by manual welding and welding cracks caused by semi-automatic welding process, improves construction efficiency and project quality, shortens the construction period, and realizes the full-position automatic welding process for pipelines passing through tunnels.

[0034] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0036] Figure 1 The following is a schematic diagram showing a flow chart of a method for installing a pipeline in a tunnel according to an embodiment of the present invention;

[0037] Figure 2 A schematic diagram showing a pipeline installation in an embodiment of the present invention in which the pipeline is welded outside the hole first and then sent into position;

[0038] Figure 3 A schematic diagram showing a method of first laying pipes in a hole and then welding them together to install pipes in one embodiment of the present invention;

[0039] Figure 4 A schematic diagram of a transport and management track in one embodiment of the present invention is schematically shown;

[0040] Figure 5 A schematic diagram of a pipe transport pulley in one embodiment of the present invention is schematically shown;

[0041] Figure 6 A schematic diagram of a pipe inlet platform in one embodiment of the present invention is schematically shown;

[0042] Figure 7 A schematic diagram of a curved movable gantry hoisting pipeline in one embodiment of the present invention is schematically shown;

[0043] Figure 8 A schematic diagram of a pipeline layout plane in a tunnel according to an embodiment of the present invention is shown schematically;

[0044] Fig. 9 A schematic diagram of a pipeline support in one embodiment of the present invention is schematically shown;

[0045] Fig.10 The schematic diagram of the installation of the pipeline in the tunnel according to one embodiment of the present invention is schematically shown.

[0046] Description of Reference Numerals

[0047] 1 Type I tunnel 2 Two-to-one pipeline

[0048] 3 Welding platform 4 Guide pulley

[0049] 5 Wire rope 6 Winch

[0050] 7 Anchor 10 Type II tunnel

[0051] 20 Pipeline 30 First pipe inlet platform

[0052] 40 Second pipe inlet platform 50 Guide pulley

[0053] 60 Wire Rope 70 Winch

[0054] 80 Track 90 Track Car

[0055] 510 pipe clamp 520 pipe

[0056] 710 Arc-shaped mobile hanger 720 Nylon hanging pipe belt

[0057] 730 Hook 740 Manual Hoist

[0058] 750 Pipeline 760 Pipe pier

[0059] 810 Door-shaped pipe hanger 820 Transport trolley

[0060] 1001 Tunnel 1002 Pipeline Support

[0061] 1003 Temporary support 1004 Jack

[0062] 1005 Pipe assembly welding DETAILED DESCRIPTION

[0063] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0064] Figure 1 The following is a schematic diagram showing a flow chart of a method for installing a pipeline in a tunnel according to an embodiment of the present invention. Figure 1 As shown, in an embodiment of the present invention, a method for installing a pipeline in a tunnel is provided, which can be described by taking the method applied to a processor as an example, and specifically can include the following steps:

[0065] Step S102, obtaining relevant information of the tunnel, wherein the relevant information includes curvature information, inclination information and width information.

[0066] Step S104, determining the category corresponding to the tunnel according to the relevant information, wherein the category includes a first tunnel category and a second tunnel category, the first tunnel category is a tunnel category that does not have a slope change point and a turning point, an inclination angle is less than a preset inclination angle, and a width is less than a preset width threshold, and the second tunnel category is a tunnel category that has a slope change point and / or a turning point, and a width greater than or equal to a preset width threshold, the slope change point is a position where the tunnel turns in the longitudinal direction, and the turning point is a position where the tunnel turns in the lateral direction.

[0067] Step S106, according to the pre-stored correspondence between the tunnel category and the pipeline installation strategy, determine the pipeline installation strategy corresponding to the category according to the category, wherein the pipeline installation strategy includes welding by automatic welding, and the pipeline installation strategy includes a first strategy corresponding to the first tunnel category and a second strategy corresponding to the second tunnel category. The first strategy adopts the method of welding outside the tunnel, and the second strategy adopts the method of welding inside the tunnel.

[0068] Step S108: Install pipelines in the tunnel according to the pipeline installation strategy corresponding to the category.

[0069] It can be understood that the tunnel is a tunnel to be constructed, that is, a tunnel where a pipeline needs to be installed. The relevant information of the tunnel to be constructed may specifically include the straightness information of the tunnel (i.e., whether there is a slope change point and / or a turning point), the inclination information of the tunnel (i.e., slope information), the width information in the tunnel, etc., wherein the slope change point is the position where the tunnel turns in the longitudinal direction, and the turning point is the position where the tunnel turns in the transverse direction, that is, the straightness of the tunnel includes the straightness in the longitudinal direction and the straightness in the transverse direction. The preset width threshold is a preset width value in the tunnel that meets the conditions for automatic welding construction, such as 20 meters. The preset inclination angle is the maximum tunnel inclination angle corresponding to the preset first tunnel category, such as 16°.

[0070] Specifically, the processor can obtain relevant information of the tunnel (including straightness information, inclination information and width information), and then determine the corresponding category of the tunnel according to the relevant information. If there are no slope change points and turning points in the tunnel, the inclination is less than the preset inclination, and the width is less than the preset width threshold (that is, the conditions for automatic welding construction are not met), then the tunnel can be determined as the first tunnel category. If there are slope change points and / or turning points in the tunnel, and the width is greater than or equal to the preset width threshold (that is, the conditions for automatic welding construction are met), then the tunnel can be determined as the second tunnel category, and then the corresponding pipeline installation strategy can be determined according to the pre-stored correspondence between the first tunnel category and the first strategy, and the correspondence between the second tunnel category and the second strategy according to the specific tunnel category. Wherein, regardless of the first tunnel category or the second tunnel category, the pipe section is welded by automatic welding. The automatic welding method can, for example, use a fully automatic welding machine or a welding robot to weld the assembled pipe sections, so that the tunnel can be installed with a pipeline according to the corresponding pipeline installation strategy, that is, the processor can control the corresponding actuator based on the pipeline installation strategy to perform specific pipeline installation actions.

[0071] The above-mentioned method for installing a pipeline in a tunnel obtains relevant information about the tunnel, including straightness information, inclination information, and width information, and determines the corresponding category of the tunnel according to the relevant information. The first tunnel category is a tunnel category without a slope change point and a turning point, with an inclination less than a preset inclination and a width less than a preset width threshold. The second tunnel category is a tunnel category with a slope change point and / or a turning point and a width greater than or equal to a preset width threshold. According to the correspondence between the pre-stored tunnel category and the pipeline installation strategy, the pipeline installation strategy corresponding to the category is determined according to the category. The pipeline installation strategy includes welding by automatic welding. The first tunnel category corresponds to the first strategy, and the second tunnel category corresponds to the second strategy. Then, the tunnel is installed with the pipeline installation strategy corresponding to the category. The above-mentioned scheme determines the category of the tunnel according to the characteristics of the tunnel, and then selects the corresponding pipeline installation strategy according to the category of the tunnel. The pipeline installation strategy adopts a fully automatic welding method for welding, which can avoid problems such as low construction efficiency caused by manual welding and welding cracks caused by semi-automatic welding process, improves construction efficiency and project quality, shortens the construction period, and realizes the full-position automatic welding process for pipelines passing through tunnels.

[0072] In one embodiment, a pipeline is installed in a tunnel according to a pipeline installation strategy corresponding to a category, including: determining that the pipeline installation strategy corresponding to the category is a first strategy; setting a welding platform and a first winch at a tunnel entrance on a side that is at a higher position in the tunnel, and setting a second winch at a tunnel entrance on a side that is at a lower position in the tunnel, wherein the inclination angle of the welding platform is equal to the inclination angle of the tunnel; welding the pipe segments in sequence on the welding platform by automatic welding to obtain welded pipe segments; and transporting the welded pipe segments into the tunnel by a transport vehicle in cooperation with the first winch and the second winch to achieve pipeline installation in the tunnel.

[0073] It can be understood that the assembly welding platform can be used to assemble and weld the pipe segments, and the inclination angle of the assembly welding platform is equal to the inclination angle of the tunnel, which facilitates sending the welded pipe segments into the tunnel.

[0074] Specifically, when the category corresponding to the tunnel is the first tunnel category, the pipeline installation strategy can be determined as the first strategy, and then a welding platform and a first winch can be set at a tunnel entrance on one side at a higher position in the tunnel, and a second winch can be set at a tunnel entrance on one side at a lower position in the tunnel. The pipe sections are welded in sequence on the welding platform by automatic welding. For example, two sections of pipe sections can be prefabricated in two-in-one on the welding platform first, and the prefabricated pipe sections are first transported into the tunnel. At the tunnel entrance, other prefabricated pipe sections are welded in two-in-one with the prefabricated pipe sections entering the tunnel to obtain welded pipe sections. This process is repeated. Specifically, the welded pipe sections can be transported to the tunnel by a transport vehicle in cooperation with the first winch and the second winch to realize the pipeline installation in the tunnel. It can be understood that the first strategy is to weld outside the tunnel first and then send them to the tunnel for placement.

[0075] In one embodiment, the transport vehicle may include a rail vehicle, and the bottom of the tunnel may be provided with rails.

[0076] It can be understood that tracks are laid at the bottom of the tunnel so that rail vehicles can travel on the tracks. Further, tracks can also be laid at the bottom of the welding platform, and the transport vehicle can start to travel from the welding platform.

[0077] In another embodiment, the transport vehicle can also be a wheeled trolley. In this case, the bottom of the tunnel and / or the welding platform does not need to be laid with tracks. That is, the pipe section can be lifted onto the wheeled trolley by a crane, and then the welded pipe section can be transported to the tunnel by the wheeled trolley. This method requires that the ground in the tunnel must be flat and the center line is placed in the tunnel. During the traction process, the pipeline running deviation is measured and controlled at any time to reduce the difficulty of adjusting the position of the pipeline left and right when it is in place. At the same time, the installation position of the trolley should be planned to avoid the trolley stopping at the pipe pier position, which will affect the construction of the pipe pier.

[0078] In one embodiment, before the welded pipe section is transported into the tunnel by a rail car in cooperation with a first winch and a second winch, the process also includes: performing at least one of weld joint detection, anti-corrosion patching, and sandblasting to remove rust on the welded pipe section.

[0079] It is understandable that after welding is completed, the welded pipe section needs to be subjected to at least one of the following processes: weld joint detection, anti-corrosion joint patching, and sandblasting and rust removal, so as to control the welding quality.

[0080] In one embodiment, the preset inclination angle is 15°.

[0081] It can be understood that a tunnel category in which the tunnel inclination is less than 15°, there is no slope change point and turning point, and the width is less than a preset width threshold can be determined as the first tunnel category.

[0082] In one embodiment, the length of the welding platform ranges from 28 to 75 m, the height of the welding platform does not exceed 6 m, and the width of the welding platform ranges from 10 to 16 m.

[0083] In one embodiment, the welded pipe section is transported into the tunnel by a transport vehicle in cooperation with a first winch and a second winch, including: placing the welded pipe section on a rail car, connecting one end of the rail car to the wire rope of the first winch through a first managed head, connecting the other end of the rail car to the wire rope of the second winch through a second managed head, and starting the first winch and the second winch to drag the rail car into the tunnel along the track.

[0084] In one embodiment, a pipeline is installed in a tunnel according to a pipeline installation strategy corresponding to a category, including: determining that the pipeline installation strategy corresponding to the category is a second strategy; determining that the tunnel includes a slope change point or a turning point; setting up pipe entry platforms at both ends of the tunnel, wherein the pipe entry platform includes a winch, and tracks are laid at the bottom of the tunnel; transporting a steering joint from one end of the tunnel to the inside of the tunnel by a rail car in cooperation with the winch until the steering joint reaches the position of the slope change point or the turning point; transporting pipe sections from both ends of the tunnel to both sides of the steering joint by a rail car in sequence; after all the pipe sections arrive in the tunnel, welding the pipe sections by automatic welding to achieve pipeline installation in the tunnel.

[0085] Specifically, when the category corresponding to the tunnel is the second tunnel category, the pipeline installation strategy can be determined as the second strategy, and then the number of slope change points or turning points in the tunnel can be determined. When the tunnel includes a slope change point or a turning point, a pipe entry platform can be set at both ends of the tunnel, wherein the pipe entry platform includes a winch, and a track is laid at the bottom of the tunnel. The steering joint is transported from one end of the tunnel to the tunnel by a rail car in cooperation with the winch until the steering joint reaches the slope change point or the turning point. The pipe sections are transported from both ends of the tunnel to both sides of the steering joint by the rail car in turn. After all the pipe sections arrive in the tunnel, the pipe sections are welded by automatic welding to realize the pipeline installation in the tunnel. It can be understood that the second strategy is to lay the pipes in the tunnel first and then weld them.

[0086] In one embodiment, the inclination angles of the sub-tunnels on both sides of the slope change point or the turning point of the tunnel respectively range from 0 to 28° and from 0 to 15°.

[0087] It can be understood that the slope change point or the turning point can divide the original tunnel into two sub-tunnels, and the inclination angle ranges of the two sub-tunnels can include 0-28° and 0-15° respectively.

[0088] In one embodiment, after the pipe segments are transported from both ends of the tunnel to both sides of the steering joint in sequence by a rail car, it also includes: setting a temporary support under the pipe segment to support the pipe segment, and the rail car withdraws before the next temporary support is installed until the pipe laying of all pipe segments is completed.

[0089] In one embodiment, the method further includes: after all the pipe sections are welded, pipe supports are arranged at preset intervals in the tunnel to support the pipe.

[0090] It can be understood that the pipe supports are used to support the pipes, and the preset distance is the preset spacing distance of the pipe supports.

[0091] In one embodiment, the preset distance ranges from 15 to 25 m.

[0092] In a specific embodiment, Figure 2 and Figure 3 As shown, the method for installing a pipeline in a tunnel may specifically include the following steps:

[0093] For the first type of tunnel 1 (i.e. the first tunnel type, such as Figure 2 As shown in the figure, the pipeline is installed by welding outside the tunnel first and then sending it into place. Here, the first type of tunnel is a tunnel without slope change points or turning points in the tunnel and with a slope less than 15°. The construction space in the tunnel is narrow and does not have the conditions for automatic welding construction (for example, a double-pipe laying tunnel has been built, and automatic welding construction was not considered in the original tunnel design. In this type of tunnel, the clearance width on both sides of the pipeline to be constructed after pipe laying is less than 0.8m). In addition, the terrain outside the tunnel entrances on both sides of the first type of tunnel should have the conditions for building prefabricated construction platforms and installing construction lifting equipment, that is, there should be a platform or gentle slope of not less than 30m in length and not less than 20m in width on the extension line of at least one side of the tunnel entrance.

[0094] For the second type of tunnel 10 (i.e. the second tunnel category, such as Figure 3 Here, the second type of tunnel 10 is a tunnel with a slope change point or a turning point in the tunnel and a construction space in the tunnel that has conditions for automatic welding construction (for example, a tunnel with a clearance width of not less than 0.8m between the two sides of the pipeline to be constructed and the tunnel wall after the pipe laying is completed). In addition, the slope change point or turning point here refers to the tunnel turning in the longitudinal or transverse direction, and prefabricated elbows need to be installed during pipeline construction.

[0095] In an exemplary embodiment, if Figure 2 As shown in the figure, the pipeline installation method of welding outside the hole first and then sending it into place can include:

[0096] A welding platform 3 and a first hoist are set on one side of the tunnel, and a second hoist is set on the other side. Tracks are laid along the entire bottom of the tunnel ( Figure 2Here, the welding platform 3 and the first hoist are usually arranged on the higher side of the first type tunnel. The first hoist and the second hoist are both composed of a hoist 6, a wire rope 5 and a corresponding guide pulley 4. In addition, the first hoist and the second hoist can also be provided with ground anchors 7 respectively to better fix them on the ground.

[0097] The return pipe section is prefabricated in advance on the assembly welding platform 3 by two-in-one connection. When formally returning, the two prefabricated sections of the pipe are welded in two-in-one connection at the tunnel entrance to obtain the two-in-one pipe 2.

[0098] Using rail cars ( Figure 1 (not shown) cooperate with the first winch and the second winch to deliver the two-to-one pipe 2 into the tunnel. Specifically, the two-to-one pipe can be placed on the rail car on the assembly welding platform 3, one end of the two-to-one pipe 2 is connected to the steel wire rope of the first winch, and the other end is connected to the management head, which is connected to the steel wire rope of the second winch. The first winch and the second winch are started to drag the pipe into the tunnel along the track. Repeat the above operation sequence to install the pipe until the installation of the pipe in the entire first-class tunnel is completed.

[0099] In an exemplary embodiment, the method for installing a pipeline in a tunnel may further include: performing weld inspection, anti-corrosion patching, sandblasting and rust removal on the two-to-one pipeline before sending the pipeline into the tunnel.

[0100] In an exemplary embodiment, the length of the welding platform may be 28 to 75 m, the height may not exceed 6 m, and the width may be 10 to 16 m. In this exemplary embodiment, the inclination angle of the first type of tunnel may be 0 to 15°, and the inclination angle of the welding platform is the same as the inclination angle of the first type of tunnel. The following is a detailed description of the automatic welding pipeline construction process for the first type of tunnel:

[0101] 1. Pipeline installation is done by welding outside the hole first and then sending it into place

[0102] 1.1 Tunnel entrance welding construction site preparation

[0103] The welding outside the tunnel requires that the entrance and exit of the tunnel are relatively open, with sufficient space as the welding construction site. If there is a slope at the tunnel entrance, the solutions that can be adopted are:

[0104] 1) The tunnel entrance welding site is included in the tunnel design. Before the tunnel construction, the tunnel entrance site is excavated and leveled, which is beneficial to the tunnel construction and also ensures the welding construction needs.

[0105] 2) For sites with a smaller slope, a fill pile can be used to form a 65m long and 15m wide welding prefabricated platform to ensure that the pipeline in the welding section is straight.

[0106] The welding site needs to be set up with facilities such as a temporary pipe storage yard, tool shed, duty room, and film washing room (as needed).

[0107] 1.2 Pipeline prefabrication

[0108] At least one fully automatic welding unit and one testing unit are set up in each tunnel. 4-5 welds are welded every day. Non-destructive testing is carried out immediately after welding. After passing the test, the pipe is dragged into the tunnel. For example, the fully automatic unit can be configured as 1 internal welding machine + dual-torch fully automatic welding machine.

[0109] Here, weld inspection should follow up the welding progress, and inspection, sandblasting, rust removal and anti-corrosion processes should be carried out on the same day of welding to avoid idle work in the unit.

[0110] 1.3 Pipeline positioning plan

[0111] 1.3.1 Pipeline positioning method

[0112] There are two ways to put the pipeline in place:

[0113] 1) Use a wheeled trolley. Each steel pipe is equipped with a wheeled trolley. The height of the trolley loading the pipe is slightly higher than the pipe pier. After all the pipes are pulled into place, the pipe piers in the tunnel are constructed. After the maintenance of the pipe piers is completed, the pipes are supported by jacks, the trolley is removed, the jacks are lowered, and the pipes fall on the pipe piers to complete the pipe placement. This method requires that the ground in the tunnel must be flat and the center line is placed in the tunnel. During the traction process, the pipeline walking deviation is measured and controlled at any time to reduce the difficulty of adjusting the position of the pipeline left and right when it is in place. At the same time, the installation position of the trolley should be planned to avoid the trolley stopping at the pipe pier position, which will affect the construction of the pipe pier.

[0114] 2) A rail car can be used. The rail car supports the pipeline to run on the pre-installed track. In this way, the pipeline will not deviate, which can ensure that the center line deviation of the pipeline is within the allowable error range. Tracks and rail cars can be included in the design as permanent facilities for pipeline support. If wheeled equipment is used for traction, the trolley is prone to left and right deviation. Once deviation occurs, it is difficult to correct the position. In order to ensure the center line deviation of the pipeline, the track method is usually used to drag the pipe into place.

[0115] In addition, the traction pipeline uses a winch with an independent large-capacity rope drum. When the rope length exceeds the drum capacity, the rope capacity problem of the winch in long-distance tunnels can be solved by cutting the wire rope and replacing the empty drum when the rope capacity of the drum reaches its limit.

[0116] In this exemplary embodiment, Figure 3 As shown in the figure, the method of laying pipes in the hole first and then welding them together to install the pipeline may include:

[0117] A first pipe entry platform 30 and a second pipe entry platform 40 are arranged at both ends of the second type of tunnel. The first pipe entry platform 30 and the second pipe entry platform 40 both include a winch 70, a guide pulley 50 and a steel wire rope 60, and a track 80 is laid throughout the bottom of the tunnel.

[0118] The rail vehicle 90 cooperates with the winch 70 to transport the turning elbow from one end of the tunnel into the tunnel. After arriving at the designated position, the turning elbow is arranged. Then, the pipeline is transported into the tunnel through the pipe entry platforms at both ends of the tunnel and the straight pipe sections on both sides of the turning elbow are arranged.

[0119] After the pipe laying is completed, assembly welding, weld joint inspection, and anti-corrosion patching construction are carried out to complete the installation of pipes in the tunnel from the inside to the outside and from the middle to both sides.

[0120] In one embodiment, the inclination angles at both ends of the curve of the second type of tunnel may be 0-28° and 0-15° respectively.

[0121] In an exemplary embodiment, delivering the pipe into the tunnel may include:

[0122] The pipe 20 is loaded onto the rail car 90 of the pipe entry platform by a crane, and lowered into place by a winch 70, and a pipe support is set under the pipe to hold the pipe. The rail car is withdrawn before the next pipe support is installed, and the above steps are repeated until all pipes are laid.

[0123] In an exemplary embodiment, the automatic welding construction method may further include installing stainless steel support pipe clamps at intervals of 15 to 25 m in the tunnel after the pipeline welding is completed.

[0124] The following is a detailed description of the automatic welding pipeline construction process for the second type of tunnel:

[0125] 2. Install the pipeline by laying the pipes in the hole first and then welding them together.

[0126] 2.1 Track layout

[0127] Light rails are laid on the pipe access platform and throughout the tunnel for rail vehicles to pass. Here, temporary rails can be laid along the tunnel using 10# channel steel on the second-class tunnel floor. The centerline of the rails is consistent with the designed centerline of the pipeline, and the rail width is 800-1200mm. For example, the spacing of the rails can be 0.8m, and the rails can be fully welded and pulled with 16mm thick steel plates every 2m, and connected to the concrete floor with expansion bolts. As pipe transport rails, the rail spacing deviation does not exceed 2mm. Figure 4 shown.

[0128] Here, the rail car can be modified by adding steel wheels using the pipeline support. The wheelbase of the rail car is 0.8m, the wheel diameter is 0.3m, the chassis can be made of 14# channel steel, the car length is 0.65m, the car width is 1m, and the pipeline is clamped tightly with a self-made pipe clamp, such as Figure 5 shown.

[0129] When installing the track, the sleeper pads and shims can be used to adjust and fix the position. To ensure the safety of the track, a D20 steel bar can be welded every 2m at the lower edge of the track to stabilize the track. The length of the steel bar should not hinder the movement of the track vehicle.

[0130] After the rails are installed, the center line, rail elevation, gauge, and curve vector are measured to fine-tune the rails. Then, at the embedded pads, the rails are firmly welded to the pads according to the design requirements, and the weld height is not less than 10mm.

[0131] 2.2 Rust removal and protection of pipe mouth

[0132] The steel pipe mouth is treated with sandblasting to remove rust. After the sandblasting and rust removal reaches the grade, the pipe mouth is sealed and protected with tape and other items to prevent oxidation and rust.

[0133] 2.3 Pipeline transportation and hoisting

[0134] 1) Rubber sheet padding measures should be adopted for anti-corrosion pipe transport vehicles, and rubber sheet or other soft material padding should be added at the contact point between the binding rope and the pipe.

[0135] 2) During transportation, the pipes must be tied securely and fixed to the transport vehicle with two tie-downs. To prevent pipeline damage and the occurrence of "pipe rolling" and "pipe shooting", 10mm thick and 500mm high steel plate baffles are welded at the front and rear ends of the transport vehicle.

[0136] 3) Special lifting equipment should be used for loading and unloading anti-corrosion pipes. The surface in contact with the pipe should be lined with rubber or other soft materials. Rough loading and unloading operations are strictly prohibited and special attention should be paid to the protection of the pipe mouth.

[0137] 2.4 Fabrication of the pipe entry platform at both ends of the tunnel

[0138] In order to facilitate the pipeline in and out of the tunnel, a special pipeline inlet platform is built with steel pipes and steel plates at the tunnel exits on both sides. Figure 6 As shown, railings are installed on the platform, and the slope angle of the platform is consistent with the slope angle of the roadway. Before setting up the platform, the original simple shed is dismantled.

[0139] 2.5 Selection of winch and wire rope

[0140] According to the stress of the steel pipe in the tunnel, the winches at both ends of the tunnel can be selected as 15T electric winches, and guide pulleys are set at the slope change points in the tunnel. The wire rope specification is 6×19S+FC, and the diameter is φ=18mm.

[0141] 2.6 Pipeline layout

[0142] Use a crane to load the pipe onto the rail car of the pipe entry platform. The crane can only unload the car after it is tied and fixed and the winch is turned on and in place. In order to ensure that the pipe enters the tunnel smoothly, the winch is used to cooperate with the transportation. Careful operation is carried out and the pipe is lowered at a uniform speed to achieve smooth walking. After the pipe reaches the position, it is towed into place by the winch. After it is in place, the pipe clamp is released, and the gantry crane and hand winch are used to lift the pipe vertically to a certain height. Then, a wooden beam is used as a temporary support for the pipe under the pipe to hold the pipe. The center line of the temporary support of the pipe is consistent with the center line of the pipe, and no horizontal shift is required. The schematic diagram of the arc-shaped mobile gantry hoisting the pipe can be shown as follows Figure 7 As shown. A 10mm rubber pad is placed on the support to protect the anti-corrosion layer. The rail car is withdrawn before the second pipe support is installed. This process is repeated until the steel pipes are laid. The gantry crane is made according to the size of the tunnel, and 4 wheels are installed at the bottom for movement in the tunnel. The gantry crane is at least 200mm away from the tunnel wall and at least 300mm away from the steel pipe.

[0143] Temporary pipe piers are set on the pipeline design and installation axis, and sleepers are used as temporary pipe piers to reduce the workload of secondary lifting of the pipeline into place.

[0144] The steel pipe is placed on two temporary wooden pipe piers for support. The top surface height of the temporary wooden pipe pier should be 100mm higher than the inner side of the designed curved surface of the stainless steel pipe clamp. The temporary pipe pier must avoid the designed pipe pier position. The schematic diagram of the pipeline layout plane in the tunnel can be as follows: Figure 8 shown.

[0145] 2.7 Pipeline pairing

[0146] After the pipeline arrives at the assembly location, two gantry cranes are used to lift the pipelines to be assembled. The manual hoists on the gantry cranes are used to fine-tune the pipelines to meet the assembly requirements. When assembling, operators are required on both sides of the pipeline, and the operating space on both sides of the pipeline is at least 500mm.

[0147] 2.8 Welding, testing and patching

[0148] The welding operation starts from the middle of the tunnel, and the two welding units weld synchronously outwards in opposite directions until the welding of the entire pipeline and other process operations are completed.

[0149] 2.9 Pipe clamp installation

[0150] Before installing the pipeline in the tunnel, the tunnel floor must be flat. If it is not flat, a certain thickness of concrete cushion must be poured at the bottom of the tunnel to meet the requirement of flat tunnel floor. Then, the steel plate base of the stainless steel support is embedded on the tunnel floor with a spacing of 20m.

[0151] The stainless steel support and the steel plate base are connected by welding or bolts. The pipeline is installed on the stainless steel support and fixed with pipe clamps, such as Fig. 9 shown.

[0152] like Fig.10 As shown in the figure, after all the pipelines are welded and installed in place, hydraulic jacks with different strokes (2 70T) are used to support the pipeline so that the pipe section is suspended in the air and separated from the temporary pipe pier. The pipeline steel supports are installed in place according to the design requirements, the temporary pipe pier is withdrawn, and then the fall chain is lowered at a uniform speed until the steel pipe falls on the installed steel support, and then the upper operation is repeated until all the temporary pipe piers are withdrawn and all the supports are installed.

[0153] In summary, the beneficial effects of the embodiments of the present invention may include the following: it solves the problem that the current tunnel crossing construction of high-grade steel, large-diameter long-distance pipelines in mountainous areas can only adopt semi-automatic welding technology, which is prone to welding cracks, low construction efficiency, long construction period, and low welding quality. It realizes the full process of automatic welding operation of tunnel crossing construction of high-grade steel, large-diameter long-distance pipelines in mountainous areas, improves welding quality and construction efficiency, and shortens the construction period.

[0154] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for installing a pipeline in a tunnel, characterized in that: include: Acquire relevant information of the tunnel, wherein the relevant information includes curvature information, inclination information, and width information; Determine the category corresponding to the tunnel according to the relevant information, wherein the category includes a first tunnel category and a second tunnel category, the first tunnel category is a tunnel category without a slope change point and a turning point, an inclination angle less than a preset inclination angle, and a width less than a preset width threshold, and the second tunnel category is a tunnel category with a slope change point and / or a turning point, and a width greater than or equal to the preset width threshold, the slope change point is a position where the tunnel turns in the longitudinal direction, and the turning point is a position where the tunnel turns in the transverse direction; According to the pre-stored correspondence between the tunnel category and the pipeline installation strategy, the pipeline installation strategy corresponding to the category is determined according to the category, wherein the pipeline installation strategy includes welding by automatic welding, and the pipeline installation strategy includes a first strategy corresponding to the first tunnel category and a second strategy corresponding to the second tunnel category, the first strategy adopts the method of welding outside the tunnel, and the second strategy adopts the method of welding inside the tunnel; The step of installing a pipeline in the tunnel according to the pipeline installation strategy corresponding to the category includes: Determine that the pipeline installation strategy corresponding to the category is the first strategy; set a welding platform and a first winch at a tunnel entrance on one side at a higher position in the tunnel, and set a second winch at a tunnel entrance on one side at a lower position in the tunnel, wherein the inclination angle of the welding platform is equal to the inclination angle of the tunnel; weld the pipe segments in sequence on the welding platform by automatic welding to obtain welded pipe segments; transport the welded pipe segments into the tunnel by a transport vehicle in cooperation with the first winch and the second winch to realize pipeline installation in the tunnel; Determine that the pipeline installation strategy corresponding to the category is the second strategy; determine that the tunnel includes a slope change point or a turning point; respectively set up pipe entry platforms at both ends of the tunnel, wherein the pipe entry platforms include a winch, and tracks are laid at the bottom of the tunnel; transport the steering joint from one end of the tunnel into the tunnel by a rail car in cooperation with the winch until the steering joint reaches the position of the slope change point or the turning point; transport the pipe sections from both ends of the tunnel to both sides of the steering joint in sequence by the rail car; after all the pipe sections arrive in the tunnel, weld the pipe sections by automatic welding to achieve pipeline installation in the tunnel.

2. The method for installing a pipeline in a tunnel according to claim 1, characterized in that: The transport vehicle comprises a rail vehicle, and rails are laid at the bottom of the tunnel.

3. The method for installing a pipeline in a tunnel according to claim 2, characterized in that: Before the rail vehicle cooperates with the first hoist and the second hoist to transport the welded pipe section into the tunnel, the method further includes: The welded pipe section is subjected to at least one of the following processes: weld joint detection, anti-corrosion joint patching, and sandblasting for rust removal.

4. The method for installing a pipeline in a tunnel according to claim 1, characterized in that: The preset inclination angle is 15°.

5. The method for installing a pipeline in a tunnel according to claim 1, characterized in that: The length of the welding platform ranges from 28 to 75 m, the height of the welding platform does not exceed 6 m, and the width of the welding platform ranges from 10 to 16 m.

6. The method for installing a pipeline in a tunnel according to claim 2, characterized in that: The method of transporting the welded pipe section into the tunnel by using a transport vehicle in cooperation with the first hoist and the second hoist comprises: The welded pipe section is placed on the rail car, one end of the rail car is connected to the wire rope of the first hoist through a first hosting head, and the other end of the rail car is connected to the wire rope of the second hoist through a second hosting head, and the first hoist and the second hoist are started to drag the rail car along the track into the tunnel.

7. The method for installing a pipeline in a tunnel according to claim 1, characterized in that: The inclination angles of the branch tunnels on both sides of the slope change point or turning point of the tunnel are respectively in the range of 0-28° and 0-15°.

8. The method for installing a pipeline in a tunnel according to claim 1, characterized in that: After the pipe sections are transported from both ends of the tunnel to both sides of the steering joint in sequence by the rail car, the method further includes: A temporary support is arranged under the pipe section to support the pipe section, and the rail car is withdrawn before the next temporary support is installed until the pipe laying of all the pipe sections is completed.

9. The method for installing a pipeline in a tunnel according to claim 1, characterized in that: Also includes: After all the pipe sections are welded, pipe supports are arranged at preset intervals in the tunnel to support the pipes.

10. The method for installing a pipeline in a tunnel according to claim 9, characterized in that: The preset distance ranges from 15 to 25 m.

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