Fixing structure for LNG receiving station

Abstract

The utility model relates to the technical field of petrochemical industry construction, in particular to a fixing structure for an LNG (liquefied natural gas) receiving station, which is used for fixing a buried seawater pipeline in the LNG receiving station and comprises a fixing mechanism and a sinking reducing mechanism. The bottom of the fixing mechanism and the bottom of the sinking reducing mechanism are both placed on a fixing face, the fixing mechanism wraps the end and the elbow of the buried seawater pipeline, and the sinking reducing mechanism is arranged outside the buried seawater pipeline between every two adjacent fixing mechanisms and attached to the buried seawater pipeline. According to the fixing structure, seawater leakage caused by overlarge displacement of the buried seawater pipeline can be avoided, so that the safety and applicability of the fixing structure in the using process of the fixing structure are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical industrial buildings, in particular to a fixed structure for an LNG receiving station. Background Art

[0002] The buried seawater pipeline in the LNG receiving station is mainly used for seawater transportation between the water intake and the vaporizer. The diameter of the buried seawater pipeline is mostly above 1.7m, and the design pressure of seawater transported in the pipeline is above 0.8Mpa. The pipe elbows and pipe ends can generate more than 250 tons of water hammer pressure under the design pressure. Under the action of this water hammer pressure, the pipeline will produce a large displacement. The seawater pipeline is mostly made of glass fiber and is a flexible pipeline. It is extremely sensitive to displacement and settlement, and the displacement requirement does not exceed 6mm.

[0003] At present, the straight pipe sections of buried seawater pipelines in existing LNG receiving stations are directly supported on the pipeline sinking reduction structure. No hard transition point is set to weaken the pipeline and concrete. Semi-wrapped pipeline fixing structures are mostly set at the pipeline elbows and pipeline ends. The semi-wrapped pipeline fixing structures cannot strictly limit the displacement of the pipeline, which can easily cause excessive displacement of the pipeline and lead to seawater leakage. Utility Model Content

[0004] (I) The utility model provides a fixing structure for an LNG receiving station, which alleviates the technical problem that the prior art cannot strictly limit the displacement of pipelines, resulting in excessive displacement of pipelines and causing seawater leakage.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the embodiment of the utility model provides a fixing structure for an LNG receiving station, which is used to fix the buried seawater pipeline in the LNG receiving station, including a fixing mechanism and a sinking reduction mechanism;

[0007] The bottoms of the fixing mechanism and the sinking reduction mechanism are both placed on the fixing surface, the fixing mechanism is covered on the end and elbow of the buried seawater pipeline, and the sinking reduction mechanism is arranged outside the buried seawater pipeline between two adjacent fixing mechanisms and fits with the buried seawater pipeline.

[0008] Furthermore, the fixing mechanism includes a first engineering pile and a fixing assembly, the first engineering pile is installed on the fixing surface, the fixing assembly is arranged on the top of the first engineering pile, and the buried seawater pipeline passes through the inside of the fixing assembly.

[0009] Furthermore, the fixing assembly includes a buttress, which is arranged on the top of the first engineering pile, and the buried seawater pipeline passes through the buttress and is fixed.

[0010] Furthermore, the buttress is provided with a connecting passage, and the buried seawater pipeline passes through the connecting passage and is fixed in the buttress.

[0011] Furthermore, the outer side of the buried seawater pipeline located in the pier is covered with a flexible part.

[0012] Furthermore, the fixing mechanism also includes an anti-cracking steel mesh, which is arranged in the connecting channel, connected to the inner wall of the connecting channel, and covered on the outside of the flexible part.

[0013] Furthermore, the fixing assembly also includes a first backfill portion, and the first backfill portion is arranged around the pier.

[0014] Furthermore, the sinking reduction mechanism includes a second engineering pile and a receiving assembly, the second engineering pile is installed on the fixing surface, the receiving assembly is arranged on the top of the second engineering pile, and the receiving assembly receives the buried seawater pipeline above.

[0015] Furthermore, the receiving assembly includes a cap, which is arranged on the top of the second engineering pile, and the buried seawater pipeline is placed on the cap.

[0016] Furthermore, the receiving assembly further comprises a second backfilling portion, and the second backfilling portion is arranged between the buried seawater pipeline and the cap and in the circumference of the buried seawater pipeline.

[0017] Beneficial effects of the utility model: the utility model provides a fixing structure for an LNG receiving station, which is used to fix the buried seawater pipeline in the LNG receiving station. The fixing mechanism and the sinking reduction mechanism are placed on a fixing surface, and the fixing mechanism is then covered on the end and elbow of the buried seawater pipeline, thereby limiting the displacement of the buried seawater pipeline to avoid seawater leakage caused by excessive displacement of the buried seawater pipeline. At the same time, a sinking reduction mechanism is fitted on the outside of the buried seawater pipeline between two adjacent fixing mechanisms, that is, a sinking reduction mechanism is provided on the straight pipe portion of the buried seawater pipeline to avoid uneven settlement of the buried seawater pipeline. Therefore, the fixing mechanism provided by the utility model can ensure its safety and applicability during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1A schematic plan view of a fixed structure for an LNG receiving station provided in an embodiment of the utility model;

[0020] Figure 2 A cross-sectional view of a fixing mechanism of a fixing structure for an LNG receiving station provided in an embodiment of the utility model;

[0021] Figure 3 A cross-sectional view of a fixed structure sinking reduction mechanism for an LNG receiving station provided in an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of an elbow of a fixing mechanism of a fixing structure for an LNG receiving station provided in an embodiment of the utility model;

[0023] Figure 5 A schematic diagram of an end portion of a fixing mechanism of a fixing structure for an LNG receiving station provided in an embodiment of the utility model;

[0024] Figure 6 A top view of backfilling of a fixing mechanism of a fixing structure for an LNG receiving station provided in an embodiment of the utility model.

[0025] icon:

[0026] 100-buried seawater pipeline; 101-flexible part;

[0027] 200-fixing mechanism; 201-first engineering pile; 202-buttress; 203-connecting channel; 204-anti-crack steel mesh; 205-first backfill part;

[0028] 300 - sinking reduction mechanism; 301 - second engineering pile; 302 - foundation; 303 - second backfill part. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] like Figures 1 to 6 As shown, the utility model provides a fixing structure for an LNG receiving station, which is used to fix a buried seawater pipeline 100 in the LNG receiving station, and includes a fixing mechanism 200 and a sinking reduction mechanism 300; the bottoms of the fixing mechanism 200 and the sinking reduction mechanism 300 are both placed on a fixing surface, the fixing mechanism 200 is covered on the end and elbow of the buried seawater pipeline 100, and the sinking reduction mechanism 300 is arranged on the outside of the buried seawater pipeline 100 between two adjacent fixing mechanisms 200, and fits with the buried seawater pipeline 100.

[0033] In this embodiment, the buried seawater pipeline 100 in the LNG receiving station is fixed by placing the fixing mechanism 200 and the sinking reduction mechanism 300 on the fixing surface, and then covering the end and elbow of the buried seawater pipeline 100 with the fixing mechanism 200, so as to limit the displacement of the buried seawater pipeline 100 to avoid seawater leakage caused by excessive displacement of the buried seawater pipeline 100. At the same time, the sinking reduction mechanism 300 is fitted on the outside of the buried seawater pipeline 100 between two adjacent fixing mechanisms 200, that is, the sinking reduction mechanism 300 is provided on the straight pipe part of the buried seawater pipeline 100 to avoid uneven settlement of the buried seawater pipeline 100. Therefore, the fixing structure provided in this embodiment can ensure its safety and applicability during use.

[0034] The fixing mechanism 200 and the sinking reduction mechanism 300 are both cast by concrete or reinforced concrete.

[0035] According to an embodiment provided by the utility model, Figure 1 , Figure 2 and Figure 6 As shown, the fixing mechanism 200 includes a first engineering pile 201 and a fixing assembly. The first engineering pile 201 is installed on the fixing surface, the fixing assembly is arranged on the top of the first engineering pile 201, and the buried seawater pipeline 100 passes through the inside of the fixing assembly.

[0036] In this embodiment, the fixing mechanism 200 includes a first engineering pile 201 and a fixing assembly. The first engineering pile 201 is installed on the fixing surface, the fixing assembly is arranged on the top of the first engineering pile 201, and the buried seawater pipeline 100 passes through the inside of the fixing assembly, that is, a part of the buried seawater pipeline 100 is enclosed inside the fixing assembly.

[0037] Furthermore, the fixing assembly includes a buttress 202 , which is disposed on the top of the first engineering pile 201 , and the buried seawater pipeline 100 passes through the buttress 202 and is fixed.

[0038] In this embodiment, preferably, the fixing assembly includes a pier 202, which is arranged on the top of the first engineering pile 201, and the buried seawater pipeline 100 passes through the inside of the pier 202, and a part of it is enclosed in the pier 202. The first engineering pile 201 and the pier 202 are both prefabricated by using reinforced concrete and used in combination, which can effectively improve the on-site construction efficiency.

[0039] Optionally, the first engineering pile 201 and the pier 202 are fixedly connected by cast-in-place reinforced concrete at the construction site.

[0040] According to an embodiment provided by the utility model, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the buttress 202 is provided with a connecting passage 203 , and the buried seawater pipeline 100 passes through the connecting passage 203 and is fixed in the buttress 202 .

[0041] In this embodiment, during the prefabrication process of the pier 202, a connecting pipe is provided inside the pier 202 according to the actual pipeline parameters used, so that the buried seawater pipeline 100 passes through the pier 202 and a part of it is enclosed inside the pier 202. Preferably, the number of connecting pipes is two, and the shapes and sizes are consistent. The prefabrication can be carried out according to actual use requirements.

[0042] According to an embodiment provided by the utility model, Figure 1 , Figure 2 , Figure 4 ,and Figure 5 As shown, the outer side of the buried seawater pipeline 100 located in the pier 202 is covered with a flexible portion 101 .

[0043] In this embodiment, the outer side of the buried seawater pipeline 100 located in the pier 202 is also covered with a layer of flexible portion 101, that is, the flexible portion 101 is arranged on the surface of the buried seawater pipeline 100 in the pier 202, so that it serves as a softening transition point between the buried seawater pipeline 100 and the pier 202, thereby ensuring the overall applicability of the pier 202.

[0044] Among them, optionally, the flexible part 101 is divided into a rubber ring, glass cloth and chopped strands of felt, and the buried seawater pipeline 100 enclosed in the pier 202 is wrapped with rubber rings at both ends thereof, and a layer of glass cloth is wrapped in the middle section located in the pier 202, and a layer of chopped strands of felt is wrapped outside and then a layer of glass cloth is wrapped. The thickness of the rubber ring and the chopped strands of felt is selected to be 15 mm, and the rubber ring should protrude 25 mm from the outer wall of the pier 202. The value can be adjusted according to actual usage conditions, and its purpose does not deviate from the design concept of the utility model and should belong to the protection scope of the utility model.

[0045] According to an embodiment provided by the utility model, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the fixing mechanism 200 further includes an anti-cracking steel mesh 204 , which is disposed in the connecting channel 203 , connected to the inner wall of the connecting channel 203 , and wrapped around the outer side of the flexible portion 101 .

[0046] In this embodiment, the fixing mechanism 200 also includes an anti-cracking steel mesh 204, which is arranged in the connecting channel 203. At the same time, the anti-cracking steel mesh 204 cooperates with the flexible part 101, and is covered on the outside of the flexible part 101 and connected to the inner wall of the connecting pipe to improve the safety of the fixing mechanism 200 and prevent it from cracking.

[0047] By covering the anti-cracking steel mesh 204 and the flexible part 101 , the cracking of the fixing mechanism 200 of the buried seawater pipeline 100 can be effectively prevented, and at the same time, the buried seawater pipeline 100 can be well protected, thereby increasing the overall service life of the buried seawater pipeline 100 .

[0048] Preferably, the anti-cracking steel mesh 204 is composed of two layers of round steel bars covering the buried seawater pipeline 100 and eight groups of full-length upright bars and stirrups evenly distributed along the round steel bars.

[0049] According to an embodiment provided by the utility model, Figure 6 As shown, the fixing assembly further includes a first backfill portion 205 , and the first backfill portion 205 is disposed around the pier 202 .

[0050] In this embodiment, the fixing assembly further includes a first backfill portion 205, wherein preferably, the first backfill portion 205 is divided into two parts: sand and stone and original soil.

[0051] The crushed stones and pebbles in the sand-and-stone mixture account for 30%-40% of the total weight, and the compaction degree is not less than 0.95, which ranges from the bottom surface of the pier 202 to the depth of the floor surface, and the range within 2m of the outer side of the pier 202 and the range of 45° from 2m to the floor surface. The compaction degree of the original soil part is not less than 0.90, and its range is from the top surface of the pier 202 to not less than 100mm above the top surface. By setting the first backfill part 205 around the pier 202 in the above manner, it can not only beautify the appearance of the pier 202, but also improve its safety in use.

[0052] According to an embodiment provided by the utility model, Figure 1 and Figure 3 As shown, the sinking reduction mechanism 300 includes a second engineering pile 301 and a receiving assembly. The second engineering pile 301 is installed on a fixed surface. The receiving assembly is arranged on the top of the second engineering pile 301. The receiving assembly receives the buried seawater pipeline 100 above.

[0053] In this embodiment, the sinking reduction mechanism 300 includes a second engineering pile 301 and a receiving assembly. The second engineering pile 301 is installed on a fixed surface, and the receiving assembly is arranged on the top of the second engineering pile 301. Under the action of the buried seawater pipeline 100's own gravity and the upper ground load, the pipeline sinking reduction mechanism 300 can limit the sinking of the buried seawater pipeline 100, so that the buried seawater pipeline 100 can be received above the receiving assembly.

[0054] According to an embodiment provided by the utility model, Figure 1 and Figure 3 As shown, the receiving assembly includes a cap 302 , which is disposed on the top of the second engineering pile 301 , and the buried seawater pipeline 100 is placed on the cap 302 .

[0055] In this embodiment, specifically, the receiving assembly includes a bearing platform 302 , which is disposed on the top of the second engineering pile 301 and can effectively receive the buried seawater pipeline 100 .

[0056] Preferably, the second engineering pile 301 and the cap 302 are both prefabricated by using reinforced concrete and used in combination, which can effectively improve the on-site construction efficiency.

[0057] Optionally, the second engineering pile 301 and the cap 302 are fixedly connected by cast-in-place reinforced concrete at the construction site.

[0058] According to an embodiment provided by the utility model, Figure 1 and Figure 3 As shown, the receiving assembly further includes a second backfill portion 303 , which is disposed between the buried seawater pipeline 100 and the cap 302 and in the circumference of the buried seawater pipeline 100 .

[0059] In this embodiment, the receiving assembly also includes a second backfill portion 303, which is arranged between the buried seawater pipeline 100 and the base 302 and in the circumference of the buried seawater pipeline 100. Specifically, the second backfill portion 303 is divided into three parts, namely, the part between the bottom of the buried seawater pipeline 100 and the base 302, the parts on both sides and the top of the buried seawater pipeline 100, and the part 500-1000mm above the top of the buried seawater pipeline 100.

[0060] Preferably, the second backfill portion 303 between the bottom of the buried seawater pipeline 100 and the cap 302 uses a transition cushion layer paved with medium-coarse sand, and the backfill thickness of the transition cushion layer paved with medium-coarse sand does not exceed 100 mm each time and the compaction degree is not less than 0.95, so as to ensure that the transition cushion layer can provide long-term and stable support for the buried seawater pipeline 100, and also ensure that the buried seawater pipeline 100 is directly in contact with the hard reinforced concrete. Optionally, the maximum particle size of the medium-coarse sand is not greater than 25 mm, and the minimum thickness of the transition cushion layer paved with medium-coarse sand is one-fourth of the diameter of the buried seawater pipeline 100 and not greater than 150 mm.

[0061] The sides and top of the buried seawater pipeline 100 are backfilled with medium-coarse sand, crushed stone and gravel with a maximum particle size of no more than 40 mm. The backfill thickness of the sides of the buried seawater pipeline 100 should be 100-200 mm each time and the compaction degree should be no less than 0.95. The backfill thickness of the top of the buried seawater pipeline 100 should be 100-200 mm each time and the compaction degree should be no less than 0.85, and the backfill should be at least 500 mm above the bottom of the pipe.

[0062] The portion 500-1000mm above the top of the buried seawater pipeline 100 shall be backfilled with original soil, and the backfill compaction degree shall not be less than 0.90.

[0063] The fixing structure for the LNG receiving station provided by the utility model can improve the anti-displacement and anti-settling performance of the large-diameter buried seawater pipeline 100. The pipeline fixing mechanism 200 can limit the displacement of the seawater pipeline under the water hammer pressure, and the anti-cracking steel mesh 204 and the flexible part 101 covering the buried seawater pipeline 100 can effectively limit the cracking of the fixing mechanism 200 of the buried seawater pipeline 100 and protect the buried seawater pipeline 100; under the gravity of the buried seawater pipeline 100 and the upper ground load, the pipeline sinking reduction mechanism 300 can limit the buried seawater pipeline 100. The pipeline 100 settles, and the medium-coarse sand filled between the cap 302 and the buried seawater pipeline 100 can provide effective long-term support for the buried seawater pipeline 100 as a transition cushion. The transition cushion also protects the buried seawater pipeline 100 from direct contact with hard concrete. The utility model takes into account the anti-displacement and anti-settlement performance of the buried seawater pipeline 100 and the balance of the transition between the buried seawater pipeline 100 and reinforced concrete as soft and hard materials, thereby ensuring the safety and applicability of the fixed structure of the large-diameter buried seawater pipeline 100 used in the LNG receiving station.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixing structure for an LNG receiving station, used for fixing a buried seawater pipeline (100) in the LNG receiving station, characterized in that: It comprises a fixing mechanism (200) and a sinking reduction mechanism (300); The bottoms of the fixing mechanism (200) and the sinking reduction mechanism (300) are both placed on a fixing surface; the fixing mechanism (200) covers the end and elbow of the buried seawater pipeline (100); the sinking reduction mechanism (300) is arranged outside the buried seawater pipeline (100) between two adjacent fixing mechanisms (200) and fits the buried seawater pipeline (100).

2. A fixed structure for an LNG receiving station according to claim 1, characterized in that: The fixing mechanism (200) comprises a first engineering pile (201) and a fixing assembly, wherein the first engineering pile (201) is installed on the fixing surface, the fixing assembly is arranged on the top of the first engineering pile (201), and the buried seawater pipeline (100) passes through the inside of the fixing assembly.

3. A fixed structure for an LNG receiving station according to claim 2, characterized in that: The fixing assembly comprises a buttress (202), wherein the buttress (202) is arranged on the top of the first engineering pile (201), and the buried seawater pipeline (100) passes through the buttress (202) and is fixed.

4. A fixed structure for an LNG receiving station according to claim 3, characterized in that: The buttress (202) is provided with a connecting passage (203), and the buried seawater pipeline (100) passes through the connecting passage (203) and is fixed in the buttress (202).

5. A fixed structure for an LNG receiving station according to claim 4, characterized in that: The outer side of the buried seawater pipeline (100) located in the pier (202) is covered with a flexible part (101).

6. A fixed structure for an LNG receiving station according to claim 5, characterized in that: The fixing mechanism (200) further comprises an anti-cracking steel mesh (204), wherein the anti-cracking steel mesh (204) is arranged in the connecting channel (203), connected to the inner wall of the connecting channel (203), and covered on the outer side of the flexible portion (101).

7. A fixed structure for an LNG receiving station according to claim 4, characterized in that: The fixing assembly further comprises a first backfilling portion (205), wherein the first backfilling portion (205) is arranged in the circumference of the buttress (202).

8. The fixed structure for an LNG receiving station according to claim 2, characterized in that: The sinking reduction mechanism (300) comprises a second engineering pile (301) and a receiving assembly, wherein the second engineering pile (301) is installed on the fixing surface, the receiving assembly is arranged on the top of the second engineering pile (301), and the buried seawater pipeline (100) is received on the receiving assembly.

9. A fixed structure for an LNG receiving station according to claim 8, characterized in that: The receiving assembly comprises a bearing platform (302), the bearing platform (302) is arranged on the top of the second engineering pile (301), and the buried seawater pipeline (100) is placed on the bearing platform (302).

10. A fixed structure for an LNG receiving station according to claim 9, characterized in that: The receiving assembly further comprises a second backfill portion (303), wherein the second backfill portion (303) is arranged between the buried seawater pipeline (100) and the support platform (302) and in the circumference of the buried seawater pipeline (100).

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