Connecting device of outer wall of large cold chain warehouse and main structure of cold chain warehouse

Abstract

The utility model discloses a connecting device of large -scale cold chain warehouse outer wall and cold storage main body structure, solves the problem of poor stability of traditional device structure, High energy consumption . The two vertical walls of the cold chain warehouse outer wall are connected with the two ends of the frame beam respectively, the lower wall of the frame beam is embedded with several iron plates, the iron plates are welded with the first angle steel, the several vertical wall bodies arranged along the inner side of the frame beam of the cold chain warehouse main body structure are connected through the ring beam, the ring beam is embedded with the second angle steel, the horizontal upper surface of the exposed end of the second angle steel is perpendicular to the vertical surface of the first angle steel, the bolt passes through the hole of the vertical surface of the first angle steel and is welded with the exposed end of the second angle steel, the exposed end surface of the second angle steel, the surface of the screw and the two side surfaces of the vertical wall of the first angle steel have the outer spraying polyurethane heat preservation layer.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, and in particular to a rigid connection node structure for the outer wall and main structure of a large cold chain warehouse. It can be widely used in building engineering fields with stringent requirements for thermal insulation performance and structural stability, such as low-temperature storage, fresh food logistics, and pharmaceutical cold chain. Background Technology

[0002] The connection between the exterior walls and the main structure of existing cold chain warehouses mostly adopts the traditional mortar bonding combined with the structural column anchoring process (according to Article 4.4.3 of the "Cold Chain Warehouse Design Standard" GB 50072-2021). The exterior wall frame beams and the main structure's ring beams are connected by concrete. The core of this connection is to form an integral whole with the wall blocks, exterior wall frame beams, and main structure ring beams through the bonding force of the masonry mortar, relying on the bond between the masonry and the reinforced concrete to transfer the load.

[0003] This process has three major flaws: 1. Insufficient structural stability: Under seismic fortification conditions of intensity 7, the maximum settlement displacement of the wall reached 15mm (far exceeding the standard limit of 10mm), and under strong wind load (0.6kN / m²), the stability was further compromised. 2 Under the influence of these factors, through cracks are easily generated. A real-world engineering case shows that such cracks increase maintenance costs by 30%.

[0004] 2. Significant thermal bridging effect: Due to the direct contact between the metal components at the connection points, a heat conduction channel is formed. Field tests showed that at a storage temperature of -23℃, the heat flux density of traditional connection nodes reached 12 W / m². 2 It is three times higher than other parts of the wall, with an annual additional energy consumption of over 8,000 kWh.

[0005] 3. Construction and maintenance limitations: Structural columns require multiple processes such as formwork, steel bar binding, and concrete pouring, which extends the construction period by 25%; later repairs require the demolition of the entire wall section, and the repair of a 1000㎡ cold chain warehouse resulted in a production stoppage loss of over 50,000 yuan. Summary of the Invention

[0006] The purpose of this invention is to provide a structure with good structural stability. Low energy consumption and easy maintenance Connection device between the exterior wall of a large cold chain warehouse and the main structure of the cold chain warehouse.

[0007] The purpose of this utility model is achieved as follows: The connection device between the outer wall of the large cold chain warehouse and the main structure of the cold chain warehouse includes two vertical walls 12 of the outer wall of the cold chain warehouse, which are respectively connected to the two ends of the frame beam 1. Several iron plates 5 are pre-embedded in the lower wall of the frame beam 1. The iron plates are welded to the upper part of the first angle steel 6. Several vertical walls 3 are arranged along the inner side of the frame beam 1 of the main structure of the cold chain warehouse. The vertical walls 3 are connected by a ring beam 2. The ring beam 2 is pre-embedded with a second angle steel 7. The horizontal upper part of the exposed end of the second angle steel is perpendicular to the vertical surface of the first angle steel. The bolt 8 passes through the hole in the vertical surface of the first angle steel and is welded to the horizontal lower part of the exposed end of the second angle steel. The first and second angle steels have a horizontal spacing. The bolt 8 is fixedly connected to the two vertical sides of the first angle steel through a washer 10 and a nut 9. The exposed end surface of the second angle steel, the surface of the bolt 8, and the two sides of the vertical wall of the first angle steel are covered with an externally sprayed polyurethane insulation layer 11.

[0008] The connection device between the outer wall of a large cold chain warehouse and the main structure of the cold chain warehouse is characterized in that the first and second angle steels are spaced apart in the horizontal direction. The hole on the vertical face of the first angle steel 6 is elliptical, with a major axis of 60mm and a minor axis of 40mm. The diameter of the bolt 8 is 30mm, and its minor axis is a horizontal line.

[0009] The ring beams 2 are located on the same straight line, and the second angle steel 7 on the adjacent ring beams 2 are 4500 mm apart. The cold storage exterior wall construction employs an innovative method of connecting the wall to the main structural beams of the cold chain warehouse using bolts, changing the traditional connection mode between the wall and the main structure. During the construction phase of the main structural ring beam 2, high-strength bolts (M30) are precisely pre-embedded according to the design spacing. The bolts are made of grade 8.8 or higher high-strength bolts and are sprayed with 50mm of polyurethane to enhance corrosion resistance. When the exterior wall reaches the corresponding height, L-shaped (L100*12mm) angle steels 6 and 7 are connected to the wall blocks using bolts 8. Bolts 8 are then horizontally and tightly fixed to angle steel 6 using nuts and washers. Next, the pre-embedded iron plate 5 (200*300*12mm) and L-shaped (L140*12mm) angle steel 6 on the main structural beam are welded together. Finally, angle steel 6 of the exterior wall is welded to angle steel 7 of the main building ring beam 2 using bolts 8. This connection method forms a rigid constraint system, enabling the exterior wall and the main structure ring beam 2 to share the load together, significantly improving the overall stability of the wall. Meanwhile, a 20mm horizontal shrinkage gap is reserved between the first and second angle steels, and an external polyurethane insulation layer 11 is sprayed on the exposed end surface of the second angle steel, the surface of the bolt 8, and the two sides of the vertical wall of the first angle steel.

[0010] After the cold storage has cooled down for six months, the nuts and bolts on both sides of the first angle steel vertical wall are fixed, and a 50mm layer of polyurethane is sprayed on the outside, with a thermal conductivity ≤0.022W / (m・K). The bolts on both sides block the thermal bridge formed by the metal bolts, preventing heat from being conducted from the high-temperature area to the low-temperature area through the bolts, effectively reducing the cold storage's cooling capacity loss and ensuring the cold storage's insulation performance.

[0011] The advantages of this utility model are as follows: (1) Improve wall stability Compared to traditional masonry walls that rely solely on mortar bonding and structural column connections, the bolt-8 connection method can increase the wall's lateral force resistance by over 40%. When encountering external loads such as strong winds and earthquakes, it effectively reduces wall displacement and cracking, ensuring the structural safety of the cold storage. Taking a simulated test of an actual cold storage project as an example, under a seismic fortification intensity of 7 degrees, the maximum settlement displacement of the external wall using bolt-8 connections was 8mm, while the maximum settlement displacement of the external wall using the traditional connection method reached 15mm. Significant improvement in structural stability: By forming a synergistic force-bearing system through "pre-embedded iron plates + rigid connection of the first and second angle steels," third-party testing showed that the maximum settlement displacement of the wall under a seismic fortification intensity of 7 degrees was only 7.8mm, a 48% reduction compared to the traditional method; the wind load resistance reached 0.8kN / m. 2 It meets the requirements for Class B buildings in the "Code for Design of Building Structures" GB50009-2012. In a practical engineering application, after experiencing a level 6 gust of wind, no visible deformation was observed at the nodes. (2) Blocking heat conduction Traditional wall-to-beam connections often result in thermal bridges due to concrete contact, leading to increased cold loss. The exposed surface of the second angle steel, the surface of bolt 8, and both sides of the vertical wall of the first angle steel are coated with an external polyurethane insulation layer 11. By allowing a 20mm cooling shrinkage gap, the thermal conductivity of the connection point can be reduced by more than 70%. Actual testing shows that in a cold storage facility using this technology, at a temperature of -25℃, the temperature difference between the surface of the connection point and the interior temperature is controlled within 3℃, while the difference can reach 8-10℃ with traditional methods, significantly improving the energy efficiency of the cold storage. (3) Convenient construction and strong maintainability Bolted connections offer simple installation and operation, increasing construction speed by 30% compared to traditional methods and effectively shortening the construction period. Furthermore, if the wall is damaged later, it facilitates disassembly and repair; simply loosening the bolts allows for localized replacement or repair of the wall without extensive structural damage, thus reducing maintenance costs. (4) Enhanced environmental adaptability: The polyurethane insulation layer did not crack during the temperature cycling test from -30℃ to 60℃; the water absorption rate was ≤3% after 28 days in a RH90% environment, which solved the problem of moisture return and mold growth in high humidity environments of traditional processes. Attached Figure Description

[0012] Figure 1 This is a top view of the present invention.

[0013] Figure 2 for Figure 1 A=A view.

[0014] Figure 3 This is a structural diagram of the embedded iron plate.

[0015] Figure 4 This is the structural diagram of the first and second angle steel. Detailed Implementation

[0016] Example

[0017] A connection device between the outer wall of a large cold chain warehouse and the main structure of the cold chain warehouse is characterized in that the two vertical walls 12 of the outer wall of the cold chain warehouse are respectively connected to the two ends of the frame beam 1. Several iron plates 5 are pre-embedded in the lower wall of the frame beam. The iron plates are welded to the upper part of the first angle steel 6. Several vertical walls 3 arranged along the inner side of the frame beam of the main structure of the cold chain warehouse are connected by a ring beam 2. The ring beam pre-embeds a second angle steel 7. The horizontal upper part of the exposed end of the second angle steel is perpendicular to the vertical surface of the first angle steel. The bolt 8 passes through the hole in the vertical surface of the first angle steel and is in horizontal contact with the horizontal lower part of the exposed end of the second angle steel. The end face of the bolt 8 is spaced from the ring beam. The bolt is connected to the two vertical sides of the first angle steel through a washer 10 and a nut 9. The exposed end surface of the second angle steel, the surface of the bolt 8, and the two sides of the vertical wall of the first angle steel are covered with an externally sprayed polyurethane insulation layer 11.

[0018] The hole on the vertical face of the first angle steel 6 is elliptical, with a major axis of 60mm and a minor axis of 40mm. The diameter of the bolt 8 is 30mm, and its minor axis is a horizontal line.

[0019] The ring beams 2 are located on the same straight line, and the distance between adjacent ring beams 2 is 4500 mm.

[0020] The technical solution of this utility model is a rigid connection node structure between the outer wall and the main structure of a large cold chain warehouse, which consists of three parts: embedded components, connecting components, and insulation components. The structure and connection relationship of each component are as follows: 1. Embedded components Components: Includes 5 Q355B grade embedded iron plates (size 200×300×14mm) and 6 Φ14HRB400 grade anchoring steel bars (arranged in 2 columns and 3 rows, with a spacing of 100mm, and the ends of the steel bars are 50mm from the edge of the iron plate). Connection relationship: The anchoring steel bars are welded to the back of the embedded iron plate 5. The embedded iron plate 5 is tied to the main reinforcement of the frame beam 1 by the anchoring steel bars, and is fixed with the side of the frame beam 1 by the positioning template. After the concrete is poured, it forms an integral whole with the frame beam 1. 2. Connecting components Components include: L140×12mm Q355B grade connecting angle steel (150mm in length), L100×12mm Q355B grade anchoring angle steel (460mm in length), 2 Φ25HRB400 grade plug-welded steel bars (1500mm in length), 70×70×12mm Q355B grade washers, and 8.8 grade M30 high-strength bolts (430mm in length, tensile strength ≥800MPa). Connection relationships: The second angle steel is embedded in the wall ring beam 2. Two Φ25 plug-welded steel bars 4 are welded through holes to both sides of the second angle steel. The two ends of the steel bars are each anchored into the wall ring beam 2 by 1500mm. The horizontal wall of the first angle steel 6 is fully welded to the embedded iron plate 5 (weld height 10mm, length consistent with the width of the iron plate), and the vertical wall is connected to the high-strength bolt 8 (with 70×70×12mm washer 10) by double nuts 9; the bolt 8 is fastened to the two vertical sides of the first angle steel by washer 10 and nut 9.

[0021] A 20mm horizontal gap is reserved between the first and second angle steels to compensate for temperature deformation after the cold chain warehouse is cooled down. After the cold chain warehouse has been cooled down for half a year, the nuts 9 on the two vertical sides of the first angle steel 6 are tightened. Structural function: The mechanical connection is achieved through the pre-tightening force of bolt 8, ensuring the tensile and shear resistance of the horizontal members (angle steel 1) and the vertical main components (frame beam 1, wall ring beam 2).

Claims

1. A connection device between the outer wall of a large cold chain warehouse and the main structure of the cold chain warehouse, characterized in that, The two vertical walls (12) of the cold chain warehouse exterior are connected to the two ends of the frame beam (1) respectively. Several iron plates (5) are pre-embedded in the lower wall of the frame beam. The iron plates are welded to the top of the first angle steel (6). Several vertical walls (3) arranged along the inner side of the frame beam of the main structure of the cold chain warehouse are connected by a ring beam (2). The ring beam is pre-embedded with the second angle steel (7). The horizontal top of the exposed end of the second angle steel is perpendicular to the vertical surface of the first angle steel. The bolt (8) passes through the hole in the vertical surface of the first angle steel and is welded to the bottom of the exposed end of the second angle steel. The bolt (8) is fixedly connected to the two vertical sides of the first angle steel through the washer (10) and nut (9). The exposed end surface of the second angle steel, the surface of the bolt (8), and the two sides of the vertical wall of the first angle steel are covered with an externally sprayed polyurethane insulation layer (11).

2. The connection device between the outer wall of a large cold chain warehouse and the main structure of the cold chain warehouse according to claim 1, characterized in that, The first and second angle steels are spaced apart in the horizontal direction.

3. The connection device between the outer wall of a large cold chain warehouse and the main structure of the cold chain warehouse according to claim 1, characterized in that, The hole on the vertical face of the first angle steel (6) is elliptical, with a major axis of 60mm and a minor axis of 40mm. The diameter of the bolt (8) is 30mm, and the minor axis is a horizontal line.

4. The connection device between the outer wall of a large cold chain warehouse and the main structure of the cold chain warehouse according to claim 1, characterized in that, The ring beams (2) are located on the same straight line, and the second angle steels (7) on the adjacent ring beams are 4500 mm apart.

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