Method for installing cross-river pipeline

Abstract

The invention relates to the field of oil and gas pipeline tunnel design, and discloses a river-crossing pipeline installation method which comprises the steps that S1, a deep vertical shaft and a shallow vertical shaft are excavated on the two sides of a river correspondingly, a tunnel is excavated between the deep vertical shaft and the shallow vertical shaft, and the tunnel comprises a horizontal section directly communicating with the deep vertical shaft and an ascending section directly communicating with the shallow vertical shaft; and S2, a first tunnel is excavated in the side, back on to the river, of the shallow shaft, the welded main pipeline is conveyed into the tunnel from the side of the shallow shaft through the first tunnel, and the first end of the main pipeline reaches the deep shaft. According to the technical scheme, the main body pipeline can be allowed to be conveyed into the tunnel after being welded on the ground, the full-automatic welding efficiency of the pipeline is improved, the construction period is shortened, a welding construction space does not need to be arranged in the tunnel, the construction period of tunnel excavation is shortened, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of oil and gas pipeline tunnel design, and in particular to an installation method for a cross-river pipeline. Background Art

[0002] When a long-distance oil and gas pipeline uses a shield tunnel to cross a river, shield shafts are usually set up on both sides of the river. The starting shaft is used for shield tunneling, pipeline hoisting and material transportation, and the receiving shaft is used for shield tunneling, dismantling and hoisting, or pipeline towing. After the shield tunnel civil engineering is completed and accepted, the pipeline needs to be installed.

[0003] At present, there are generally two ways to install the shield tunnel pipeline: one is to weld the pipeline in the tunnel. After the tunnel lane pipeline is installed, the hot-bent pipe compensator is installed in the shield shaft, and then the joint welding is carried out with the tunnel lane and the ground pipeline outside the shaft. The second is to weld the pipeline in the shaft, generally hoisted from the starting shaft side, and the pipeline is fully automatically welded, non-destructively tested, and anti-corrosion patched in the starting shaft. A traction device is set in the receiving shaft to tug and drag the pipeline to the receiving shaft. Every time a pipeline is welded in the starting shaft, the receiving shaft side drags the pipeline once, and so on and so forth to complete the fully automatic welding and installation of the pipeline in the shield tunnel lane, and then the hot-bent pipe compensator is installed in the shaft, which is similar to the first method.

[0004] In order to ensure the quality of pipeline welding and improve the safety level of pipeline construction, the construction unit explicitly requires that the pipeline must be welded automatically unless there are special circumstances. In addition, in method 2, the oil and gas pipeline is welded automatically, non-destructively tested, and anti-corrosion patched in the starting shaft, and a winch is installed in the receiving shaft to move the pipeline toward the receiving shaft by traction and dragging.

[0005] However, the above pipeline installation schemes have the following problems: for scheme 1, since the pipeline is welded in the tunnel, the tunnel is a limited space operation, and the welding installation efficiency is low. For the D1422 pipeline, only 6 to 7 joints can be welded in one day (24 hours); for scheme 2, the pipeline needs to be hoisted into the well by a gantry crane on the ground. Only one pipeline can be welded at a time in the starting shaft, and then non-destructive testing and patching are carried out. Only after acceptance can the pipeline traction be started. The construction can only be carried out sequentially, and the construction period is long. For the D1422 pipeline, the welding efficiency is only 1.5 to 2 joints / day; in addition, the receiving shaft is buried deep, the shaft construction period is long, and the project cost is high. Summary of the invention

[0006] The purpose of the invention is to overcome the problems of long construction period and high engineering cost of the cross-river pipeline in the prior art.

[0007] In order to achieve the above object, the present invention provides a method for installing a cross-river pipeline, which is characterized by comprising:

[0008] S1. Digging a deep shaft and a shallow shaft on both sides of the river respectively, and digging a tunnel between the deep shaft and the shallow shaft, wherein the tunnel includes a horizontal section directly connected to the deep shaft and an ascending section directly connected to the shallow shaft;

[0009] S2. Dig a first tunnel on the side of the shallow shaft facing away from the river, and transport the welded main pipeline from one side of the shallow shaft to the tunnel through the first tunnel, so that the first end of the main pipeline reaches the deep shaft.

[0010] In some embodiments, it further comprises:

[0011] S3. A vertical compensator is arranged in the deep shaft, and the lower end of the vertical compensator is connected to the first end of the main pipeline.

[0012] In some embodiments, it further comprises:

[0013] S4. Dig out a compensation tunnel connected to the first tunnel, set a horizontal compensator in the compensation tunnel, and connect the horizontal compensator to the second end of the main pipeline.

[0014] In some embodiments, S3 further includes: digging a second tunnel on a side of the deep shaft facing away from the river, setting a first horizontal pipeline in the second tunnel, and connecting the upper end of the vertical compensator to the first horizontal pipeline.

[0015] In some embodiments, a first fixing pier for fixing the first horizontal pipeline is provided in the second tunnel.

[0016] In some embodiments, a limit bracket is provided in the deep shaft to support the vertical compensator; and / or, the vertical compensator is coated with a flexible material.

[0017] In some embodiments, a sealing structure is provided around a connection between the vertical compensator and the main pipe at a connection point between the deep shaft and the tunnel.

[0018] In some embodiments, a second horizontal pipe connected to the horizontal compensator is provided in the compensation tunnel, and a second fixing pier for fixing the second horizontal pipe is provided.

[0019] In some embodiments, a track is provided in the tunnel, and a pipeline transportation device capable of moving on the track is provided, and the main pipeline is carried by the pipeline transportation device to move in the tunnel.

[0020] In some embodiments, the rising section includes an arc section and a slope section.

[0021] In some embodiments, the radius of curvature of the arc segment is greater than or equal to 1500 times the outer diameter of the main pipe; and / or the slope of the slope segment is less than or equal to 5%.

[0022] In some embodiments, the shallow shaft has a depth of less than 5 meters.

[0023] In some embodiments, water is injected into the tunnel and the deep shaft and the shallow shaft are backfilled.

[0024] Through the above technical solution, the main pipeline can be transported to the tunnel after welding on the ground, which improves the efficiency of fully automatic pipeline welding, shortens the construction period, eliminates the need to set up welding construction space in the tunnel, reduces the tunnel excavation period, and reduces the project cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a longitudinal cross-sectional view of a tunnel, pipeline, etc. described in the implementation mode of the present scheme;

[0026] Figure 2 It is a schematic diagram of the plan structure of the tunnel, pipeline, etc. described in the implementation mode of this scheme;

[0027] Figure 3 It is a schematic diagram of the structure of the deep shaft described in the implementation mode of this scheme;

[0028] Figure 4 It is a schematic diagram of the internal structure of the tunnel described in the implementation mode of this scheme;

[0029] Figure 5 It is a schematic diagram of the structure of the compensation tunnel described in the implementation method of this scheme.

[0030] Description of Reference Numerals

[0031] 1 tunnel 2 deep shaft

[0032] 3 shallow shaft 4 vertical compensator

[0033] 5 Main pipe 6 Horizontal compensator

[0034] 7First fixed pier 8Second fixed pier

[0035] 9 limit bracket 10 track

[0036] 11 pipeline transportation device 12 first horizontal pipeline

[0037] 13 Second horizontal pipeline

[0038] 1-1 horizontal segment 1-2 arc segment

[0039] 1-3 Slope section DETAILED DESCRIPTION

[0040] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0041] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0042] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0043] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0044] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0045] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0046] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0047] Embodiment 1

[0048] This solution provides a method for installing a cross-river pipeline, which includes:

[0049] S1. A deep shaft 2 and a shallow shaft 3 are excavated on both sides of a river, and a tunnel 1 is excavated between the deep shaft 2 and the shallow shaft 3. The tunnel 1 includes a horizontal section 1-1 directly connected to the deep shaft 2 and an ascending section directly connected to the shallow shaft 3.

[0050] S2. Dig a first tunnel on the side of the shallow shaft 3 facing away from the river, and transport the welded main pipe 5 from one side of the shallow shaft 3 to the tunnel 1 through the first tunnel, so that the first end of the main pipe 5 reaches the deep shaft 2.

[0051] The deep shaft 2 and the shallow shaft 3 may be located outside the embankment of the river respectively. The depth of the deep shaft 2 is greater than the depth of the river, and the depth of the shallow shaft 3 is less than the depth of the deep shaft 2 .

[0052] The tunnel 1 passes through the lower part of the river, and a section thereof close to the deep shaft 2 is a gradually rising ascending section, which is roughly formed into an inclined shape. The purpose of setting the ascending section is to gradually reduce the depth of the tunnel 1 and finally extend to the first open-air tunnel, so as to facilitate the lowering of the main pipeline 5 into the tunnel 1 from the first tunnel.

[0053] Tunnel 1 can be formed by excavating a shield machine, which can be lowered into the deep shaft 2 and excavated toward the other side of the river until it reaches the shallow shaft 3 to form a tunnel 1 with a horizontal section 1-1 (which may also have a slight slope) and an ascending section, and then the shield machine is lifted out of the shallow shaft 3.

[0054] The first tunnel is arranged on the side of the shallow shaft 3 facing away from the river, and is an open-air structure, which is convenient for gradually conveying the main pipeline 5 into the tunnel 1. The first tunnel can be used as a continuation of the ascending section of the tunnel 1, and its inclination angle with the horizontal plane is basically the same as the inclination angle of the ascending section.

[0055] Regarding the tunnel 1, the ascending section is inclined upward relative to the horizontal section 1-1, and the two form an obtuse angle. The main pipeline 5 first enters the ascending section, and when passing through the connection between the ascending section and the horizontal section, it can be elastically bent and deformed due to its large length, and then enters the horizontal section and returns to a straight state. The curved shape of the tunnel 1 allows the main pipeline 5 to be gradually transported into the tunnel 1 as a whole, without the need to connect the various parts of the main pipeline 5 section by section in the tunnel 1.

[0056] The main pipeline 5 is integrally welded on the ground, and undergoes anti-corrosion treatment and non-destructive testing.

[0057] In this solution, the main pipeline can be transported to the tunnel after welding on the ground, which improves the efficiency of fully automatic pipeline welding and shortens the construction period. There is no need to set up welding construction space in the tunnel, which reduces the tunnel excavation period and reduces the project cost.

[0058] In addition, the installation method of the cross-river pipeline further includes: S3, arranging a vertical compensator 4 in the deep shaft 2, and connecting the lower end of the vertical compensator 4 to the first end of the main pipeline 5. Figure 3 As shown, the vertical compensator 4 includes an upper elbow, a vertical section and a lower elbow, and the main pipeline 5 is connected to the lower elbow. The vertical compensator 4 can be telescopically deformed to compensate for the deformation of the main pipeline 5.

[0059] In addition, the installation method of the cross-river pipeline further includes: S4, digging a compensation tunnel connected to the first tunnel, setting a horizontal compensator 6 in the compensation tunnel, and connecting the horizontal compensator 6 to the second end of the main pipeline 5. The compensation tunnel is a tunnel extending horizontally, and the horizontal compensator 6 is roughly formed in a U shape and can be horizontally extended to compensate for the expansion and contraction deformation of the main pipeline 5. Figure 5 As shown, the bottom of the compensation tunnel can be a concrete cushion layer, with brick walls on both sides and filled with flexible materials to absorb the deformation of the horizontal compensator 6. The compensation tunnel can be covered by a cover plate and covered by soil on the cover plate, wherein an identification strip can be set in the soil.

[0060] Among them, S3 also includes: digging a second tunnel on the side of the deep shaft 2 facing away from the river, setting a first horizontal pipeline 12 in the second tunnel, and connecting the upper end of the vertical compensator 4 to the first horizontal pipeline 12. The second tunnel extends horizontally, which is an open-air structure, which is convenient for setting the first horizontal pipeline 12, and the first horizontal pipeline 12 is connected to the upper elbow of the vertical compensator 4 near the well wall of the deep shaft 2.

[0061] A first fixing pier 7 is provided in the second tunnel for fixing the first horizontal pipeline 12. The first fixing pier 7 may be a concrete structure, which is provided in the second tunnel and cast around the first horizontal pipeline 12 to fix the first horizontal pipeline 12.

[0062] In addition, a limit bracket 9 supporting the vertical compensator 4 is provided in the deep shaft 2; and / or, the vertical compensator 4 is covered with a flexible material. The limit bracket 9 is provided in the deep shaft 2 and supports the vertical compensator 4 to ensure the stability of the vertical compensator 4 and prevent it from moving over a large range. The vertical compensator 4 can be covered with a flexible material, that is, a tubular structure surrounding the vertical compensator 4 is formed by the flexible material. When the deep shaft 2 is filled with soil, the flexible material can allow the vertical compensator 4 to deform.

[0063] Wherein, at the connection point between the deep shaft 2 and the tunnel 1, a sealing structure is arranged around the connection point between the vertical compensator 4 and the main pipe 5. A sealing wall can be arranged at the connection point between the deep shaft 2 and the tunnel 1, with holes reserved on the sealing wall for accommodating the passage of the pipe, and a flexible sealing material can be arranged around the pipe. The sealing structure should meet the waterproof requirements to prevent the water subsequently filled into the tunnel 1 from entering the deep shaft 2. In addition, the connection point between the vertical compensator 4 and the main pipe 5 can be supported by a pipe pier. Similarly, a similar sealing structure can also be arranged at the connection point between the deep shaft 2 and the second tunnel, including a sealing wall and a flexible sealing material surrounding the pipe.

[0064] In addition, a second horizontal pipe 13 connected to the horizontal compensator 6 is provided in the compensation tunnel, and a second fixing pier 8 is provided for fixing the second horizontal pipe 13. The second fixing pier 8 can be formed by pouring concrete, which surrounds the second horizontal pipe 13 to fix the second horizontal pipe 13.

[0065] A track 10 is provided in the tunnel 1, and a pipeline transport device 11 capable of moving on the track 10 is provided, and the main pipeline 5 is carried by the pipeline transport device 11 to move in the tunnel 1. The track 10 may be a structure similar to a railway track, and the pipeline transport device 11 is a trolley structure with running wheels, on which a structure for supporting and fixing the main pipeline 5 is provided, and the pipeline transport device 11 travels along the track 10 from the shallow shaft 3 to the deep shaft 2, thereby driving the main pipeline 5 to gradually move to the deep shaft 2. After the main pipeline 5 is in place, a limiting structure may be provided in the tunnel 1 to achieve lateral fixation of the main pipeline 5.

[0066] The ascending section of the tunnel 1 includes an arc section 1-2 and a slope section 1-3. The slope section 1-3 is a straight tunnel, and the arc section 1-2 is an arc-shaped tunnel. The arc section 1-2 realizes a smooth transition between the horizontal section 1-1 and the slope section 1-3, so as to allow the main pipe 5 to pass through the arc section 1-2 more smoothly after elastic bending.

[0067] Further, the radius of curvature of the arc segment 1-2 is greater than or equal to 1500 times the outer diameter of the main pipe 5; and / or, the slope of the ramp segment 1-3 is less than or equal to 5%. The radius of curvature of the arc segment 1-2 is associated with the outer diameter of the main pipe 5. The outer diameter of the main pipe 5 affects the bending deformation ability of the main pipe 5 to a certain extent, that is, the larger the outer diameter, the smaller the degree of bending. Therefore, the radius of curvature of the arc segment 1-2 needs to be designed according to the outer diameter of the main pipe 5. On the other hand, the slope of the ramp segment 1-3 is less than or equal to 5%, that is, the ratio of the vertical height to the horizontal length of the ramp segment 1-3 is less than or equal to 5%.

[0068] The curvature radius of the arc segment 1-2 may be 1500 times the outer diameter of the main pipe 5; and the slope of the slope segment 1-3 may be 5%.

[0069] The depth of the shallow shaft 3 is less than 5 meters. The lower end of the shallow shaft 3 is connected to the upper end of the slope section 1-3. The maximum depth of the first tunnel, i.e., the depth at the shallow shaft 3, is the same as the depth of the shallow shaft 3, so as to allow the main pipeline 5 to be transported from the first tunnel to the slope section 1-3. The depth of the shallow shaft 3 should not be too large to avoid the depth of the first tunnel being too large and increasing the construction workload.

[0070] Water is injected into the tunnel 1, and the deep shaft 2 and the shallow shaft 3 are backfilled. The deep shaft 2 and the shallow shaft 3 are backfilled with original soil, wherein the sealing wall and sealing material between the deep shaft 2 and the tunnel 1 can prevent the water in the tunnel 1 from entering the deep shaft 2.

[0071] Embodiment 2

[0072] This solution provides a method for installing a cross-river pipeline, which includes:

[0073] S1. A deep shaft 2 and a shallow shaft 3 are excavated on both sides of a river, and a tunnel 1 is excavated between the deep shaft 2 and the shallow shaft 3. The tunnel 1 includes a horizontal section 1-1 directly connected to the deep shaft 2 and an ascending section directly connected to the shallow shaft 3.

[0074] S2. Dig a first tunnel on the side of the shallow shaft 3 facing away from the river, and transport the welded main pipe 5 from one side of the shallow shaft 3 to the tunnel 1 through the first tunnel, so that the first end of the main pipe 5 reaches the deep shaft 2.

[0075] The deep shaft 2 and the shallow shaft 3 may be located outside the embankment of the river respectively. The depth of the deep shaft 2 is greater than the depth of the river, and the depth of the shallow shaft 3 is less than the depth of the deep shaft 2 .

[0076] The tunnel 1 passes through the lower part of the river, and a section thereof close to the deep shaft 2 is a gradually rising ascending section, which is roughly formed into an inclined shape. The purpose of setting the ascending section is to gradually reduce the depth of the tunnel 1 and finally extend to the first open-air tunnel, so as to facilitate the lowering of the main pipeline 5 into the tunnel 1 from the first tunnel.

[0077] Tunnel 1 can be formed by excavating a shield machine, which can be lowered into the deep shaft 2 and excavated toward the other side of the river until it reaches the shallow shaft 3 to form a tunnel 1 with a horizontal section 1-1 (which may also have a slight slope) and an ascending section, and then the shield machine is lifted out of the shallow shaft 3.

[0078] The first tunnel is arranged on the side of the shallow shaft 3 facing away from the river, and is an open-air structure, which is convenient for gradually conveying the main pipeline 5 into the tunnel 1. The first tunnel can be used as a continuation of the ascending section of the tunnel 1, and its inclination angle with the horizontal plane is basically the same as the inclination angle of the ascending section.

[0079] Regarding the tunnel 1, the ascending section is inclined upward relative to the horizontal section 1-1, and the two form an obtuse angle. The main pipeline 5 first enters the ascending section, and when passing through the connection between the ascending section and the horizontal section, it can be elastically bent and deformed due to its large length, and then enters the horizontal section and returns to a straight state. The curved shape of the tunnel 1 allows the main pipeline 5 to be gradually transported into the tunnel 1 as a whole, without the need to connect the various parts of the main pipeline 5 section by section in the tunnel 1.

[0080] The main pipeline 5 is integrally welded on the ground, and undergoes anti-corrosion treatment and non-destructive testing.

[0081] In this solution, the main pipeline can be transported to the tunnel after welding on the ground, which improves the efficiency of fully automatic pipeline welding and shortens the construction period. There is no need to set up welding construction space in the tunnel, which reduces the tunnel excavation period and reduces the project cost.

[0082] In addition, the installation method of the cross-river pipeline further includes: S3, arranging a vertical compensator 4 in the deep shaft 2, and connecting the lower end of the vertical compensator 4 to the first end of the main pipeline 5. Figure 3 As shown, the vertical compensator 4 includes an upper elbow, a vertical section and a lower elbow, and the main pipeline 5 is connected to the lower elbow. The vertical compensator 4 can be telescopically deformed to compensate for the deformation of the main pipeline 5.

[0083] In addition, the installation method of the cross-river pipeline further includes: S4, digging a compensation tunnel connected to the first tunnel, setting a horizontal compensator 6 in the compensation tunnel, and connecting the horizontal compensator 6 to the second end of the main pipeline 5. The compensation tunnel is a tunnel extending horizontally, and the horizontal compensator 6 is roughly formed in a U shape and can be horizontally extended to compensate for the expansion and contraction deformation of the main pipeline 5. Figure 5 As shown, the bottom of the compensation tunnel can be a concrete cushion layer, with brick walls on both sides and filled with flexible materials to absorb the deformation of the horizontal compensator 6. The compensation tunnel can be covered by a cover plate and covered by soil on the cover plate, wherein an identification strip can be set in the soil.

[0084] Among them, S3 also includes: digging a second tunnel on the side of the deep shaft 2 facing away from the river, setting a first horizontal pipeline 12 in the second tunnel, and connecting the upper end of the vertical compensator 4 to the first horizontal pipeline 12. The second tunnel extends horizontally, which is an open-air structure, which is convenient for setting the first horizontal pipeline 12, and the first horizontal pipeline 12 is connected to the upper elbow of the vertical compensator 4 near the well wall of the deep shaft 2.

[0085] A first fixing pier 7 is provided in the second tunnel for fixing the first horizontal pipeline 12. The first fixing pier 7 may be a concrete structure, which is provided in the second tunnel and cast around the first horizontal pipeline 12 to fix the first horizontal pipeline 12.

[0086] In addition, a limit bracket 9 supporting the vertical compensator 4 is provided in the deep shaft 2; and / or, the vertical compensator 4 is covered with a flexible material. The limit bracket 9 is provided in the deep shaft 2 and supports the vertical compensator 4 to ensure the stability of the vertical compensator 4 and prevent it from moving over a large range. The vertical compensator 4 can be covered with a flexible material, that is, a tubular structure surrounding the vertical compensator 4 is formed by the flexible material. When the deep shaft 2 is filled with soil, the flexible material can allow the vertical compensator 4 to deform.

[0087] Wherein, at the connection point between the deep shaft 2 and the tunnel 1, a sealing structure is arranged around the connection point between the vertical compensator 4 and the main pipe 5. A sealing wall can be arranged at the connection point between the deep shaft 2 and the tunnel 1, with holes reserved on the sealing wall for accommodating the passage of the pipe, and a flexible sealing material can be arranged around the pipe. The sealing structure should meet the waterproof requirements to prevent the water subsequently filled into the tunnel 1 from entering the deep shaft 2. In addition, the connection point between the vertical compensator 4 and the main pipe 5 can be supported by a pipe pier. Similarly, a similar sealing structure can also be arranged at the connection point between the deep shaft 2 and the second tunnel, including a sealing wall and a flexible sealing material surrounding the pipe.

[0088] In addition, a second horizontal pipe 13 connected to the horizontal compensator 6 is provided in the compensation tunnel, and a second fixing pier 8 is provided for fixing the second horizontal pipe 13. The second fixing pier 8 can be formed by pouring concrete, which surrounds the second horizontal pipe 13 to fix the second horizontal pipe 13.

[0089] A track 10 is provided in the tunnel 1, and a pipeline transport device 11 capable of moving on the track 10 is provided, and the main pipeline 5 is carried by the pipeline transport device 11 to move in the tunnel 1. The track 10 may be a structure similar to a railway track, and the pipeline transport device 11 is a trolley structure with running wheels, on which a structure for supporting and fixing the main pipeline 5 is provided, and the pipeline transport device 11 travels along the track 10 from the shallow shaft 3 to the deep shaft 2, thereby driving the main pipeline 5 to gradually move to the deep shaft 2. After the main pipeline 5 is in place, a limiting structure may be provided in the tunnel 1 to achieve lateral fixation of the main pipeline 5.

[0090] The ascending section of the tunnel 1 includes an arc section 1-2 and a slope section 1-3. The slope section 1-3 is a straight tunnel, and the arc section 1-2 is an arc-shaped tunnel. The arc section 1-2 realizes a smooth transition between the horizontal section 1-1 and the slope section 1-3, so as to allow the main pipeline 5 to pass through the arc section 1-2 more smoothly after bending.

[0091] Further, the radius of curvature of the arc segment 1-2 is greater than or equal to 1500 times the outer diameter of the main pipe 5; and / or, the slope of the ramp segment 1-3 is less than or equal to 5%. The radius of curvature of the arc segment 1-2 is associated with the outer diameter of the main pipe 5. The outer diameter of the main pipe 5 affects the bending deformation ability of the main pipe 5 to a certain extent, that is, the larger the outer diameter, the smaller the degree of bending. Therefore, the radius of curvature of the arc segment 1-2 needs to be designed according to the outer diameter of the main pipe 5. On the other hand, the slope of the ramp segment 1-3 is less than or equal to 5%, that is, the ratio of the vertical height to the horizontal length of the ramp segment 1-3 is less than or equal to 5%.

[0092] The curvature radius of the arc segment 1-2 may be 1550 times the outer diameter of the main pipe 5; and the slope of the slope segment 1-3 may be 4%.

[0093] The depth of the shallow shaft 3 is less than 5 meters. The lower end of the shallow shaft 3 is connected to the upper end of the slope section 1-3. The maximum depth of the first tunnel, i.e., the depth at the shallow shaft 3, is the same as the depth of the shallow shaft 3, so as to allow the main pipeline 5 to be transported from the first tunnel to the slope section 1-3. The depth of the shallow shaft 3 should not be too large to avoid the depth of the first tunnel being too large and increasing the construction workload.

[0094] Water is injected into the tunnel 1, and the deep shaft 2 and the shallow shaft 3 are backfilled. The deep shaft 2 and the shallow shaft 3 are backfilled with original soil, wherein the sealing wall and sealing material between the deep shaft 2 and the tunnel 1 can prevent water in the horizontal section 1-1 from entering the deep shaft 2.

[0095] Embodiment 3

[0096] This solution provides a method for installing a cross-river pipeline, which includes:

[0097] S1. A deep shaft 2 and a shallow shaft 3 are excavated on both sides of a river, and a tunnel 1 is excavated between the deep shaft 2 and the shallow shaft 3. The tunnel 1 includes a horizontal section 1-1 directly connected to the deep shaft 2 and an ascending section directly connected to the shallow shaft 3.

[0098] S2. Dig a first tunnel on the side of the shallow shaft 3 facing away from the river, and transport the welded main pipe 5 from one side of the shallow shaft 3 to the tunnel 1 through the first tunnel, so that the first end of the main pipe 5 reaches the deep shaft 2.

[0099] The deep shaft 2 and the shallow shaft 3 may be located outside the embankment of the river respectively. The depth of the deep shaft 2 is greater than the depth of the river, and the depth of the shallow shaft 3 is less than the depth of the deep shaft 2 .

[0100] The tunnel 1 passes through the lower part of the river, and a section thereof close to the deep shaft 2 is a gradually rising ascending section, which is roughly formed into an inclined shape. The purpose of setting the ascending section is to gradually reduce the depth of the tunnel 1 and finally extend to the first open-air tunnel, so as to facilitate the lowering of the main pipeline 5 into the tunnel 1 from the first tunnel.

[0101] Tunnel 1 can be formed by excavating a shield machine, which can be lowered into the deep shaft 2 and excavated toward the other side of the river until it reaches the shallow shaft 3 to form a tunnel 1 with a horizontal section 1-1 (which may also have a slight slope) and an ascending section, and then the shield machine is lifted out of the shallow shaft 3.

[0102] The first tunnel is arranged on the side of the shallow shaft 3 facing away from the river, and is an open-air structure, which is convenient for gradually conveying the main pipeline 5 into the tunnel 1. The first tunnel can be used as a continuation of the ascending section of the tunnel 1, and its inclination angle with the horizontal plane is basically the same as the inclination angle of the ascending section.

[0103] Regarding the tunnel 1, the ascending section is inclined upward relative to the horizontal section 1-1, and the two form an obtuse angle. The main pipeline 5 first enters the ascending section, and when passing through the connection between the ascending section and the horizontal section, it can be elastically bent and deformed due to its large length, and then enters the horizontal section and returns to a straight state. The curved shape of the tunnel 1 allows the main pipeline 5 to be gradually transported into the tunnel 1 as a whole, without the need to connect the various parts of the main pipeline 5 section by section in the tunnel 1.

[0104] The main pipeline 5 is integrally welded on the ground, and undergoes anti-corrosion treatment and non-destructive testing.

[0105] In this solution, the main pipeline can be transported to the tunnel after welding on the ground, which improves the efficiency of fully automatic pipeline welding and shortens the construction period. There is no need to set up welding construction space in the tunnel, which reduces the tunnel excavation period and reduces the project cost.

[0106] In addition, the installation method of the cross-river pipeline further includes: S3, arranging a vertical compensator 4 in the deep shaft 2, and connecting the lower end of the vertical compensator 4 to the first end of the main pipeline 5. Figure 3 As shown, the vertical compensator 4 includes an upper elbow, a vertical section and a lower elbow, and the main pipeline 5 is connected to the lower elbow. The vertical compensator 4 can be telescopically deformed to compensate for the deformation of the main pipeline 5.

[0107] In addition, the installation method of the cross-river pipeline further includes: S4, digging a compensation tunnel connected to the first tunnel, setting a horizontal compensator 6 in the compensation tunnel, and connecting the horizontal compensator 6 to the second end of the main pipeline 5. The compensation tunnel is a tunnel extending horizontally, and the horizontal compensator 6 is roughly formed in a U shape and can be horizontally extended to compensate for the expansion and contraction deformation of the main pipeline 5. Figure 5 As shown, the bottom of the compensation tunnel can be a concrete cushion layer, with brick walls on both sides and filled with flexible materials to absorb the deformation of the horizontal compensator 6. The compensation tunnel can be covered by a cover plate and covered by soil on the cover plate, wherein an identification strip can be set in the soil.

[0108] Among them, S3 also includes: digging a second tunnel on the side of the deep shaft 2 facing away from the river, setting a first horizontal pipeline 12 in the second tunnel, and connecting the upper end of the vertical compensator 4 to the first horizontal pipeline 12. The second tunnel extends horizontally, which is an open-air structure, which is convenient for setting the first horizontal pipeline 12, and the first horizontal pipeline 12 is connected to the upper elbow of the vertical compensator 4 at the well wall of the deep shaft 2.

[0109] A first fixing pier 7 is provided in the second tunnel for fixing the first horizontal pipeline 12. The first fixing pier 7 may be a concrete structure, which is provided in the second tunnel and cast around the first horizontal pipeline 12 to fix the first horizontal pipeline 12.

[0110] In addition, a limit bracket 9 supporting the vertical compensator 4 is provided in the deep shaft 2; and / or, the vertical compensator 4 is covered with a flexible material. The limit bracket 9 is provided in the deep shaft 2 and supports the vertical compensator 4 to ensure the stability of the vertical compensator 4 and prevent it from moving over a large range. The vertical compensator 4 can be covered with a flexible material, that is, a tubular structure surrounding the vertical compensator 4 is formed by the flexible material. When the deep shaft 2 is filled with soil, the flexible material can allow the vertical compensator 4 to deform.

[0111] Wherein, at the connection point between the deep shaft 2 and the tunnel 1, a sealing structure is arranged around the connection point between the vertical compensator 4 and the main pipe 5. A sealing wall can be arranged at the connection point between the deep shaft 2 and the tunnel 1, with holes reserved on the sealing wall for accommodating the passage of the pipe, and a flexible sealing material can be arranged around the pipe. The sealing structure should meet the waterproof requirements to prevent the water subsequently filled into the tunnel 1 from entering the deep shaft 2. In addition, the connection point between the vertical compensator 4 and the main pipe 5 can be supported by a pipe pier. Similarly, a similar sealing structure can also be arranged at the connection point between the deep shaft 2 and the second tunnel, including a sealing wall and a flexible sealing material surrounding the pipe.

[0112] In addition, a second horizontal pipe 13 connected to the horizontal compensator 6 is provided in the compensation tunnel, and a second fixing pier 8 is provided for fixing the second horizontal pipe 13. The second fixing pier 8 can be formed by pouring concrete, which surrounds the second horizontal pipe 13 to fix the second horizontal pipe 13.

[0113] A track 10 is provided in the tunnel 1, and a pipeline transport device 11 capable of moving on the track 10 is provided, and the main pipeline 5 is carried by the pipeline transport device 11 to move in the tunnel 1. The track 10 may be a structure similar to a railway track, and the pipeline transport device 11 is a trolley structure with running wheels, on which a structure for supporting and fixing the main pipeline 5 is provided, and the pipeline transport device 11 travels along the track 10 from the shallow shaft 3 to the deep shaft 2, thereby driving the main pipeline 5 to gradually move to the deep shaft 2. After the main pipeline 5 is in place, a limiting structure may be provided in the tunnel 1 to achieve lateral fixation of the main pipeline 5.

[0114] The ascending section includes an arc section 1-2 and a ramp section 1-3. The ramp section 1-3 is a straight tunnel, and the arc section 1-2 is an arc-shaped tunnel. The arc section 1-2 realizes a smooth transition between the horizontal section 1-1 and the ramp section 1-3, so as to allow the main pipe 5 to pass through the arc section 1-2 more smoothly after bending.

[0115] Further, the radius of curvature of the arc segment 1-2 is greater than or equal to 1500 times the outer diameter of the main pipe 5; and / or, the slope of the ramp segment 1-3 is less than or equal to 5%. The radius of curvature of the arc segment 1-2 is associated with the outer diameter of the main pipe 5. The outer diameter of the main pipe 5 affects the bending deformation ability of the main pipe 5 to a certain extent, that is, the larger the outer diameter, the smaller the degree of bending. Therefore, the radius of curvature of the arc segment 1-2 needs to be designed according to the outer diameter of the main pipe 5. On the other hand, the slope of the ramp segment 1-3 is less than or equal to 5%, that is, the ratio of the vertical height to the horizontal length of the ramp segment 1-3 is less than or equal to 5%.

[0116] The curvature radius of the arc segment 1-2 may be 1600 times the outer diameter of the main pipe 5; and the slope of the slope segment 1-3 may be 3%.

[0117] The depth of the shallow shaft 3 is less than 5 meters. The lower end of the shallow shaft 3 is connected to the upper end of the slope section 1-3. The maximum depth of the first tunnel, i.e., the depth at the shallow shaft 3, is the same as the depth of the shallow shaft 3, so as to allow the main pipeline 5 to be transported from the first tunnel to the slope section 1-3. The depth of the shallow shaft 3 should not be too large to avoid the depth of the first tunnel being too large and increasing the construction workload.

[0118] Water is injected into the horizontal section 1-1, and the deep shaft 2 and the shallow shaft 3 are backfilled. The deep shaft 2 and the shallow shaft 3 are backfilled with original soil, wherein the sealing wall and sealing material between the deep shaft 2 and the tunnel 1 can prevent water in the tunnel 1 from entering the deep shaft 2.

[0119] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0120] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A method for installing a river-crossing pipeline, characterized in that: include: S1. A deep vertical shaft (2) and a shallow vertical shaft (3) are excavated on both sides of a river, and a tunnel (1) is excavated between the deep vertical shaft (2) and the shallow vertical shaft (3), wherein the tunnel (1) comprises a horizontal section (1-1) directly connected to the deep vertical shaft (2) and an ascending section directly connected to the shallow vertical shaft (3); S2. A first tunnel is excavated on the side of the shallow shaft (3) facing away from the river, and the welded main pipeline (5) is transported from one side of the shallow shaft (3) to the tunnel (1) through the first tunnel, so that the first end of the main pipeline (5) reaches the deep shaft (2).

2. The method for installing a cross-river pipeline according to claim 1, characterized in that: Also includes: S3. A vertical compensator (4) is arranged in the deep shaft (2), and the lower end of the vertical compensator (4) is connected to the first end of the main pipeline (5).

3. The method for installing a cross-river pipeline according to claim 2, characterized in that: Also includes: S4. Dig out a compensation tunnel connected to the first tunnel, set a horizontal compensator (6) in the compensation tunnel, and connect the horizontal compensator (6) to the second end of the main pipeline (5).

4. The method for installing a cross-river pipeline according to claim 3, characterized in that: S3 also includes: digging a second tunnel on the side of the deep shaft (2) facing away from the river, setting a first horizontal pipeline (12) in the second tunnel, and connecting the upper end of the vertical compensator (4) to the first horizontal pipeline (12).

5. The method for installing a cross-river pipeline according to claim 4, characterized in that: A first fixing pier (7) for fixing the first horizontal pipeline (12) is arranged in the second tunnel.

6. The method for installing a cross-river pipeline according to claim 4, characterized in that: A limiting bracket (9) for supporting the vertical compensator (4) is arranged in the deep shaft (2); and / or the vertical compensator (4) is covered with a flexible material.

7. The method for installing a cross-river pipeline according to claim 4, characterized in that: At the connection point between the deep shaft (2) and the tunnel (1), a sealing structure is provided around the connection point between the vertical compensator (4) and the main pipeline (5).

8. The method for installing a cross-river pipeline according to claim 3, characterized in that: A second horizontal pipeline (13) connected to the horizontal compensator (6) is arranged in the compensation tunnel, and a second fixing pier (8) for fixing the second horizontal pipeline (13) is arranged.

9. The method for installing a cross-river pipeline according to claim 1, characterized in that: A track (10) is arranged in the tunnel (1), and a pipeline transport device (11) capable of moving on the track (10) is arranged, and the main pipeline (5) is carried by the pipeline transport device (11) to move in the tunnel (1).

10. The method for installing a cross-river pipeline according to claim 1, characterized in that: The rising section comprises an arc section (1-2) and a slope section (1-3).

11. The method for installing a cross-river pipeline according to claim 10, characterized in that: The radius of curvature of the arc section (1-2) is greater than or equal to 1500 times the outer diameter of the main pipe (5); and / or the slope of the slope section (1-3) is less than or equal to 5%.

12. The method for installing a cross-river pipeline according to claim 1, characterized in that: The depth of the shallow vertical shaft (3) is less than 5 meters.

13. The method for installing a cross-river pipeline according to claim 1, characterized in that: Water is injected into the tunnel (1), and the deep shaft (2) and the shallow shaft (3) are backfilled.

Images