Air separation plant cold box foundation structure

Abstract

The utility model provides an air separation plant cold box foundation structure which comprises a raft foundation and a reinforced concrete support arranged at the upper end of the raft foundation, the reinforced concrete support comprises a plurality of supporting stand columns and a plurality of supporting cross beams, the supporting cross beams are transversely arranged between every two adjacent supporting stand columns, and the supporting stand columns and the supporting cross beams are arranged in a staggered mode. The upper ends of the supporting stand columns are provided with pre-embedded steel plates used for being fixedly welded to supporting legs at the lower end of the cold box and foundation bolts used for fixing the pre-embedded steel plates, and the upper ends of the pre-embedded steel plates are further provided with reinforcing plates used for reinforcing the connecting strength between the supporting legs at the lower end of the cold box and the pre-embedded steel plates. And the reinforcing plate is respectively welded and fixed with the cold box lower end bracket and the pre-embedded square plate. The raft foundation is simple in structure, the cold box and the raft foundation are arranged at intervals through the reinforced concrete support, stability of the raft foundation is guaranteed, safety inspection can be conducted on the bottom of the cold box, potential safety hazards are easy to find, and production safety is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of air separation equipment, in particular to a cold box foundation structure of an air separation equipment. Background Art

[0002] Air separation equipment is a gas separation equipment that liquefies, distills, and finally separates air into oxygen, nitrogen, and other useful gases. It is referred to as air separation equipment. In the nitrogen production device, the cold box foundation, in addition to having sufficient strength and preventing settlement and tilting, must also take into special consideration the characteristics of the equipment it carries working at low temperatures. At the same time, the nitrogen production cold box is relatively high, usually 20-45 meters. The higher the cold box, the greater the static load and operating load of the overall equipment, the higher the wind pressure and wind load it withstands. At this time, the test on the cold box foundation is higher. The foundation needs to meet the stress transmitted by the cold box. If the cold box foundation does not meet the pressure resistance, frost resistance, impermeability, and anti-overturning capabilities, the cold box is likely to collapse, which will cause serious losses.

[0003] In addition to having sufficient strength and bearing capacity, the foundation of the air separation cold box must also take into special consideration the characteristics of the equipment it carries, which is operating at low temperatures. For example, the temperature of liquid nitrogen in the nitrogen production tower is -196°C. Pearlescent sand is often used to keep the cold box and the nitrogen production tower cold. When the device is operating normally, the ambient temperature in the cold box is below zero. The process requirement for the foundation temperature of the cold box is ≥-50°C. When a fault occurs, such as liquid leakage, the ambient temperature of the contact between the cold box foundation and the surface of the cold box equipment may be in a low-temperature state. The existing cold box foundation of air separation equipment usually adopts a raft (concrete slab) foundation. In many air separation units, the cold box is directly installed on the surface of the raft foundation, that is, the bottom plate of the cold box and the surface of the raft foundation are in direct contact as a whole. When the cold box runs cold or leaks, the foundation surface will be in a low-temperature environment, and the foundation is prone to cracking and damage. In addition, since there is no gap between the bottom plate of the cold box and the raft foundation, it is impossible to see whether there is frost inside the center. Utility Model Content

[0004] In order to solve the problem in the prior art that the cold box foundation is easy to crack and difficult to inspect, the utility model provides an air separation equipment cold box foundation structure in which the bottom of the air separation equipment does not contact the surface of the cold box foundation.

[0005] The utility model provides a cold box foundation structure of an air separation device, comprising a raft foundation and a reinforced concrete support arranged at the upper end of the raft foundation, the reinforced concrete support comprising a plurality of supporting columns and a plurality of supporting beams, the supporting beams being laterally arranged between two adjacent supporting columns, the upper ends of the supporting columns being provided with embedded steel plates for welding and fixing to the lower end support legs of the cold box and anchor bolts for fixing the embedded steel plates, the upper ends of the embedded steel plates being further provided with reinforcing plates for strengthening the connection strength between the lower end support legs of the cold box and the embedded steel plates, the reinforcing plates being respectively welded and fixed to the lower end support legs of the cold box and the embedded square plates.

[0006] As a further improvement of the present invention, the raft foundation is a reinforced concrete foundation plate, and the height is between 500-1500 mm.

[0007] As a further improvement of the present invention, the thickness of the embedded steel plate is between 30-50 mm.

[0008] As a further improvement of the present invention, there are four anchor bolts on the upper end of each supporting column, and the anchor bolts are high-strength bolts.

[0009] As a further improvement of the present invention, a concrete cushion layer is further provided at the lower end of the raft foundation, and the height of the concrete cushion layer is 80-150 mm.

[0010] As a further improvement of the present invention, a backfill soil layer is further provided on the upper end and periphery of the raft foundation.

[0011] As a further improvement of the present invention, the height of the support column is between 1500-2200 mm.

[0012] The beneficial effects of the utility model are as follows: the utility model has a simple structure, the cold box and the raft foundation are spaced apart by reinforced concrete brackets, which ensures the stability of the raft foundation, and can also perform safety inspections on the bottom of the cold box, making it easy to discover safety hazards, thereby greatly improving production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a reference diagram of the use status of the cold box foundation structure of an air separation plant of the utility model;

[0014] Figure 2 The utility model is a schematic diagram of the connection structure of a raft foundation and a reinforced concrete support of a cold box foundation structure of an air separation device.

[0015] Figure 3 The utility model is a schematic diagram of the connection structure between the lower end support legs and the supporting columns of the cold box foundation structure of an air separation equipment.

[0016] Figure numerals: 1-raft foundation; 2-reinforced concrete support; 3-cold box; 4-concrete cushion; 21-support column; 22-support beam; 23-embedded steel plate; 24-anchor bolt; 25-reinforcement plate; 31-support foot. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that if there are descriptions involving orientation, such as orientations or positional relationships indicated by up, down, front, back, left, and right, the orientation descriptions may be based on the orientations or positional relationships shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0018] In the description of this utility model, if there is a quantity, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0019] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0020] like Figures 1 to 3 As shown, the utility model discloses a cold box foundation structure of an air separation equipment, including a raft foundation 1 and a reinforced concrete support 2 arranged at the upper end of the raft foundation 1, the reinforced concrete support 2 includes a plurality of supporting columns 21 and a plurality of supporting beams 22. In this embodiment, there are four supporting columns 21 and four supporting beams 22. The supporting beams 22 are transversely arranged between two adjacent supporting columns 21 to play a connecting and supporting role. The upper ends of the supporting columns 21 are provided with embedded steel plates 23 for welding and fixing to the lower end support legs 31 of the cold box 3 and anchor bolts 24 for fixing the embedded steel plates 23. The upper ends of the embedded steel plates 23 are also provided with reinforcing plates 25 for strengthening the connection strength between the lower end support legs 31 of the cold box 3 and the embedded steel plates 23. The reinforcing plates 25 are respectively welded and fixed to the lower end support of the cold box 3 and the embedded square plates to ensure a stable connection between the cold box 3 and the reinforced concrete support 2.

[0021] The utility model supports the cold box 3 by arranging a reinforced concrete bracket 2 at the upper end of the raft foundation 1, so that the bottom of the cold box 3 will not directly contact the surface of the raft foundation 1, thus ensuring that the raft foundation 1 will not be in a low-temperature environment and thus not prone to cracking, damage, etc.; and because the cold box 3 is supported by the reinforced concrete bracket 2, it is convenient to inspect the bottom of the cold box 3, observe whether there is frost on the bottom of the cold box 3, and judge whether there are leaks in the equipment and pipelines in the cold box 3, thereby ensuring production safety.

[0022] In the present invention, the raft foundation 1 is a reinforced concrete foundation plate, and the height is between 500-1500 mm. In this embodiment, the height of the reinforced concrete foundation plate is 1000 mm.

[0023] In the present invention, the thickness of the embedded steel plate 23 is between 30-50 mm. In this embodiment, the thickness of the embedded steel plate 23 is 40 mm, and the embedded steel plate 23 is low-temperature resistant.

[0024] In the present invention, there are four anchor bolts 24 on the upper end of each supporting column 21 , and the anchor bolts 24 are high-strength bolts and can withstand low temperatures, thereby ensuring stable support of the embedded steel plate 23 .

[0025] In the present invention, a concrete cushion layer 4 is further provided at the lower end of the raft foundation 1 to further enhance the stability of the foundation. The height of the concrete cushion layer 4 is 80-150 mm. In this embodiment, the height of the concrete cushion layer 4 is 100 mm.

[0026] In the present invention, a backfill soil layer is provided on the upper end and periphery of the raft foundation 1, which can protect the raft foundation 1. Even if the liquid in the cold box 3 leaks, the low-temperature liquid will first flow to the backfill soil layer. The backfill soil layer can play an isolation role and ensure the safety of the foundation.

[0027] In the present invention, the height of the support column 21 is between 1500-2200 mm. In this embodiment, the height of the support column 21 is 2000 mm.

[0028] The utility model has a simple structure. The cold box 3 and the raft foundation 1 are spaced apart by the reinforced concrete bracket 2, which ensures the stability of the raft foundation 1. It can also perform safety inspections on the bottom of the cold box 3, easily discover safety hazards, and greatly improve production safety.

[0029] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A cold box foundation structure for an air separation plant, characterized by: It includes a raft foundation and a reinforced concrete support arranged at the upper end of the raft foundation, the reinforced concrete support includes multiple supporting columns and multiple supporting beams, the supporting beams are horizontally arranged between two adjacent supporting columns, the upper ends of the supporting columns are provided with embedded steel plates for welding and fixing to the lower end support legs of the cold box and anchor bolts for fixing the embedded steel plates, the upper ends of the embedded steel plates are also provided with reinforcing plates for strengthening the connection strength between the lower end support legs of the cold box and the embedded steel plates, and the reinforcing plates are respectively welded and fixed to the lower end support of the cold box and the embedded square plates.

2. The cold box foundation structure of an air separation plant according to claim 1, characterized in that: The raft foundation is a reinforced concrete foundation plate with a height of 500-1500mm.

3. The cold box foundation structure of an air separation plant according to claim 1, characterized in that: The thickness of the embedded steel plate is between 30-50 mm.

4. The cold box foundation structure of an air separation plant according to claim 1, characterized in that: There are four anchor bolts on the upper end of each supporting column, and the anchor bolts are high-strength bolts.

5. The cold box foundation structure of an air separation plant according to claim 2, characterized in that: A concrete cushion layer is further provided at the lower end of the raft foundation, and the height of the concrete cushion layer is 80-150 mm.

6. The cold box foundation structure of an air separation plant according to claim 1, characterized in that: A backfill soil layer is also provided on the upper end and periphery of the raft foundation.

7. The cold box foundation structure of an air separation plant according to claim 1, characterized in that: The height of the support column is between 1500-2200 mm.

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