Embedded structure assembly of LNG (Liquefied Natural Gas) shock insulation support

Abstract

The utility model discloses an LNG (liquefied natural gas) shock insulation support embedded structure assembly which comprises a positioning die for one-time pouring and a corrugated pipe with a spiral stirrup, the top end of the spiral stirrup is flush with the top plane of the corrugated pipe, and the bottom end of the spiral stirrup is flush with the bottom plane of the corrugated pipe. The preformed hole is obtained by pre-burying the corrugated pipe (the corrugated pipe does not need to be pulled out), so that the construction difficulty of the preformed hole is reduced, the construction period of the preformed hole is shortened, disturbance of preformed hole construction to concrete at the top of the foundation is avoided, the strength of the concrete at the top of the foundation is guaranteed, and the construction cost is reduced; meanwhile, the preformed hole has enough roughness, chiseling is not needed, the effect is good, the construction difficulty is lowered, and the construction period is shortened; and the compactness of concrete around the corrugated pipe is ensured by adding the small-diameter spiral stirrups around the corrugated pipe, so that the mounting quality of the shock insulation support is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of LNG storage tank vibration isolation technology, specifically relating to an LNG vibration isolation bearing pre-embedded structure assembly. Background Technology

[0002] LNG receiving terminals play a crucial role in ensuring natural gas supply security, peak shaving, and the low-carbon transition of energy. As of the end of 2021, China had 22 operational LNG receiving terminals, insufficient to meet the robust demand for imported LNG. In the past two years, the construction of LNG receiving terminal projects under construction or planned has accelerated, with state-owned enterprises being the main investors, and the projects concentrated in East China. The investment in LNG receiving terminal projects ranges from 5 billion to 20 billion yuan, with long project cycles, typically requiring 3-5 years from investment initiation to commissioning. Looking at projects under construction or planned in the past two years, the designed capacity of most receiving terminals is over 5 million tons per year. It is projected that by 2025, the receiving capacity of domestic LNG receiving terminals will significantly increase, and storage tanks and supporting facilities will be further improved.

[0003] Currently, the common characteristics of mainstream large LNG storage tanks are large diameter, high height, and heavy total weight (including the internally stored LNG) exceeding 150,000 tons. By using multiple seismic isolation pads in conjunction with the LNG storage tank, the original rigid foundation is transformed into a flexible foundation, achieving the effect of overcoming rigidity with flexibility and greatly improving the seismic safety of the LNG storage tank. During the installation of the seismic isolation pad structure, a certain number of stud holes need to be pre-drilled at the top of the pile foundation. After installing the studs, grout is injected into the pre-drilled holes to fix the bottom of the seismic isolation pad structure to the top of the foundation.

[0004] Traditionally, the construction of pre-drilled holes for seismic isolation bearing studs in LNG storage tanks often employs a conventional method of pre-embedding steel molds and removing them before the initial setting of the short column concrete. However, this method still presents several quality risks: 1) Construction Difficulty: The difficulty of the traditional process lies primarily in the removal of the steel molds for the seismic isolation bearing pre-embedded parts. The molds must be removed when the concrete has initially set. Since the initial setting time of concrete varies due to environmental factors, the specific timing of removal relies heavily on experience, and misjudgment can disproportionately increase the difficulty of removal. Furthermore, the removal process requires manual rotation of the pre-embedded steel pipes in the molds multiple times. Once the pre-embedded steel pipes are loosened, they are slowly pulled out vertically, requiring high skill and significant removal difficulty. In addition, after the steel pipes are removed, the inner walls of the pre-drilled bolt holes are smooth, which does not meet grouting requirements and necessitates roughening. The small diameter and deep depth of the pre-drilled bolt holes make mechanical operation impossible, resulting in significant roughening challenges. 2) Construction Cycle: The traditional process requires manual rotation of the pre-embedded steel pipes in the molds multiple times, followed by slow vertical pulling out after the pre-embedded steel pipes have loosened. The entire process is extremely time-consuming. 3) Impact on the quality of the pile top concrete: Traditional processes remove the formwork when the concrete has initially set. The formwork removal process inevitably disturbs the concrete at the top of the pile, which affects the quality of the concrete. The subsequent roughening process may also disturb the concrete. Summary of the Invention

[0005] The purpose of this utility model is to solve the above-mentioned technical problems and provide an LNG seismic isolation bearing pre-embedded structure assembly that reduces construction difficulty and improves installation quality.

[0006] To achieve the above objectives, this utility model provides an LNG seismic isolation bearing pre-embedded structure assembly, including a positioning mold for primary casting and a corrugated pipe with spiral hoops, wherein the top end of the spiral hoops is flush with the top plane of the corrugated pipe and the bottom end is flush with the bottom plane of the corrugated pipe.

[0007] Furthermore, the positioning mold includes an annular steel plate and several central positioning tubes. Several mounting through holes are opened on the annular plane of the annular steel plate. The number of mounting through holes is the same as the number of central positioning tubes. A protective sleeve is installed in each mounting through hole. A central positioning tube is inserted into each protective sleeve. The bottom end of the central positioning tube passes through the bottom of the protective sleeve, and the top end is higher than the top of the protective sleeve. The central positioning tube is locked to the protective sleeve by adjusting bolts.

[0008] Furthermore, the positioning mold also includes multiple clamping wing plates located on the outer circular surface of the annular steel plate, and the multiple clamping wing plates are uniformly fixed on the outer circular surface of the annular steel plate along the circumferential direction.

[0009] Furthermore, the mounting through holes are evenly arranged along the circumferential direction on the annular plane of the annular steel plate.

[0010] Furthermore, the bottom of the protective sleeve is flush with the lower plane of the annular steel plate, and the top is higher than the upper plane of the annular steel plate.

[0011] Furthermore, the annular steel plate consists of two layers with the same outer diameter, with a layer spacing of 10-15 cm.

[0012] Furthermore, the bottom of the bellows has a metal cap for sealing.

[0013] Furthermore, the diameter of the spiral stirrup is 6mm or 8mm, and the spiral spacing is 100-150mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model obtains reserved holes by pre-embedding corrugated pipes (the corrugated pipes do not need to be pulled out), which reduces the construction difficulty of the reserved holes, shortens the construction cycle of the reserved holes, and avoids disturbance to the concrete at the top of the foundation during the construction of the reserved holes, thereby ensuring the strength of the concrete at the top of the foundation and reducing construction costs; at the same time, the reserved holes already have sufficient roughness, eliminating the need for further roughening, and the effect is good, reducing construction difficulty and saving construction time; adding small-diameter spiral hoops around the corrugated pipes ensures the compactness of the concrete around the corrugated pipes, greatly improving the installation quality of the seismic isolation bearings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pre-embedded structure assembly for the LNG seismic isolation bearing of this utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the positioning mold structure;

[0017] Figure 3 for Figure 2 Top view diagram;

[0018] Figure 4 Schematic diagram of pre-embedded components for seismic isolation bearings;

[0019] Figure 5 for Figure 4 Construction diagram;

[0020] Figure 6 This is a schematic diagram of the installation of seismic isolation bearings. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-3The LNG seismic isolation bearing pre-embedded structure assembly shown includes a positioning mold 1 for one-time casting and a corrugated pipe 2 with spiral stirrups 4. The top end of the spiral stirrups 4 is flush with the top plane of the corrugated pipe 2, and the bottom end is flush with the bottom plane of the corrugated pipe 2. The bottom of the corrugated pipe 2 has a metal cap 21 for sealing. In this embodiment, the diameter of the spiral stirrups 4 is 6mm or 8mm, and the spiral spacing is 100-150mm.

[0023] The positioning mold 1 includes an annular steel plate 13, multiple clamping wing plates 12 located on the outer circular surface of the annular steel plate 13, and several central positioning tubes 15. The multiple clamping wing plates 12 are uniformly fixed on the outer circular surface of the annular steel plate 13 along the circumferential direction. Several mounting through holes 16 are opened on the annular plane of the annular steel plate 13. The number of mounting through holes 16 is the same as the number of central positioning tubes 15, and the mounting through holes 16 are uniformly arranged on the annular plane of the annular steel plate 13 along the circumferential direction. A protective sleeve 11 is installed in each mounting through hole 16. The bottom of the protective sleeve 11 is flush with the lower plane of the annular steel plate 13, and the top is higher than the upper plane of the annular steel plate 13. A central positioning tube 15 is inserted into each protective sleeve 11. The bottom end of the central positioning tube 15 passes through the bottom of the protective sleeve 11, and the top end is higher than the top of the protective sleeve 11. The central positioning tube 15 is locked to the protective sleeve 11 by adjusting bolts 14. In this embodiment, the annular steel plate 13 consists of two layers with the same outer diameter, and the layer spacing is 10-15cm.

[0024] During a single pour, the bottom of each central positioning tube 15 is first inserted into the corresponding corrugated pipe 2 from the top, and the central positioning tube 15 is connected to the upper opening of the corrugated pipe 2 with plastic tape. The positioning mold 1 is suspended on the template, and the clamping wing plate 12 is placed on the template 3, with the center of the positioning mold coinciding with the center of the template. Then, the corrugated pipe 2 is passed through the protective sleeve 11 of the positioning mold until the bottom end of the central positioning tube 15 passes through the bottom of the protective sleeve 11 and the top end is higher than the top of the protective sleeve 11. The central positioning tube 15 is then locked onto the protective sleeve 11 by adjusting bolts 14. Finally, concrete is poured in one go through the central hole of the annular steel plate 13. After the initial setting of the concrete, the positioning mold 1 is removed, leaving only the corrugated pipe 2 with spiral stirrups 4. The corrugated pipe left after removing the central positioning tube 15 is the reserved hole.

[0025] Combine Figure 4The diagram also includes a seismic isolation bearing pre-embedded component 5 for secondary casting. The seismic isolation bearing pre-embedded component 5 includes an annular pre-embedded steel plate 56. The annular pre-embedded steel plate 56 has threaded holes that are evenly opened along the circumference and correspond to the number of reserved holes. A PVC pipe 53 communicating with the threaded hole is arranged on the upper surface of the annular pre-embedded steel plate 56 at each threaded hole. A pre-embedded sleeve 54 communicating with the threaded hole is arranged on the lower surface of the annular pre-embedded steel plate 56 at each threaded hole. A pre-embedded rib 55 is arranged corresponding to each pre-embedded sleeve 54. The top of the pre-embedded rib 55 is inserted into the pre-embedded sleeve 54 and fixed. The connecting bolt 51 is inserted into the PVC pipe 53 through the washer 52 and screwed into the threaded hole.

[0026] Combine Figure 5 , 6 During the secondary pouring, the pre-embedded reinforcement 55 is inserted into the corrugated pipe through the reserved hole, thereby placing the annular pre-embedded steel plate 56 of the seismic isolation bearing pre-embedded component 5 on the surface of the concrete after the initial setting of the first pour through the spacer. The height of the spacer, i.e. the distance from the annular pre-embedded steel plate 56 to the surface of the concrete, is 30-50mm. The concrete is poured again through the center hole of the annular pre-embedded steel plate 56. After the secondary pouring is completed, the connecting bolt 51 is unscrewed, and the seismic isolation bearing 6 is installed on the annular pre-embedded steel plate 56 through the connecting bolt 51, thereby completing the installation of the seismic isolation bearing.

Claims

1. An LNG seismic isolation bearing pre-embedded structure assembly, characterized in that: It includes a positioning mold for one-time casting and a corrugated pipe with spiral hoops, wherein the top end of the spiral hoops is flush with the top plane of the corrugated pipe and the bottom end is flush with the bottom plane of the corrugated pipe.

2. The LNG seismic isolation bearing pre-embedded structure assembly according to claim 1, characterized in that: The positioning mold includes an annular steel plate and several central positioning tubes. Several mounting through holes are opened on the annular plane of the annular steel plate. The number of mounting through holes is the same as the number of central positioning tubes. A protective sleeve is installed in each mounting through hole. A central positioning tube is inserted into each protective sleeve. The bottom end of the central positioning tube passes through the bottom of the protective sleeve, and the top end is higher than the top of the protective sleeve. The central positioning tube is locked to the protective sleeve by adjusting bolts.

3. The LNG seismic isolation bearing pre-embedded structure assembly according to claim 2, characterized in that: The positioning mold also includes multiple clamping wing plates located on the outer circular surface of the annular steel plate, and the multiple clamping wing plates are uniformly fixed on the outer circular surface of the annular steel plate along the circumferential direction.

4. The LNG seismic isolation bearing pre-embedded structure assembly according to claim 2, characterized in that: The mounting through holes are evenly arranged along the circumferential direction on the annular plane of the annular steel plate.

5. The LNG seismic isolation bearing pre-embedded structure assembly according to claim 2, characterized in that: The bottom of the casing is flush with the lower plane of the annular steel plate, and the top is higher than the upper plane of the annular steel plate.

6. The LNG seismic isolation bearing pre-embedded structure assembly according to claim 2, characterized in that: The annular steel plate consists of two layers with the same outer diameter, with a layer spacing of 10-15 cm.

7. The LNG seismic isolation bearing pre-embedded structure assembly according to claim 1, characterized in that: The bottom of the bellows has a metal cap for sealing.

8. The LNG seismic isolation bearing pre-embedded structure assembly according to claim 1, characterized in that: The diameter of the spiral stirrup is 6mm or 8mm, and the spiral spacing is 100-150mm.

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