Isolation layer fire-fighting pipeline connecting structure adaptive to rare earthquake displacement

Abstract

The utility model discloses an aseismatic layer fire-fighting pipeline connecting structure suitable for rare earthquake displacement relates to aseismatic pipeline structure technical field, include: metal hose, the metal hose is C symmetry structure, and the metal hose pipe body forms and has the main bending section, the metal hose both ends are straight pipe section, and the main bending section is formed with excessive bending section between two groups straight pipe sections, this connecting structure, through setting up the metal hose into C symmetry structure, can through the displacement amount of even absorption under the rare earthquake of two -way elastic deformation, avoid the structural damage caused by one -sided stress concentration, cooperate the composite bending design of transition bending section and main bending section simultaneously, effectively disperse the stress of displacement, prevent the cracking or sealing failure problem of excessive stress of pipe body local, ensure that fire-fighting pipeline still can keep structural integrity and normal function under the extreme earthquake working condition, provide reliable anti -seismic guarantee for building fire -fighting system.

Description

Technical Field

[0001] This utility model relates to the field of seismic isolation pipeline structure technology, specifically to a fire-fighting pipeline connection structure that adapts to the displacement of rare earthquakes. Background Technology

[0002] In the field of building engineering, seismic isolation technology is a key means to improve the seismic safety of buildings in high-intensity earthquake zones. It involves placing a seismic isolation layer between the building foundation and the superstructure, causing relative displacement of the isolation layer during an earthquake, thereby reducing the transmission of seismic energy to the upper structure. As a vital lifeline facility for buildings, fire protection piping systems must be compatible with the displacement characteristics of the seismic isolation layer. This is especially challenging in areas with high seismic fortification intensity (such as parts of southwestern China) and in projects with complex conditions such as high altitudes and special pier and support dimensions.

[0003] Traditional rigid connection structures cannot adapt to the large displacement of 315mm generated by the seismic isolation layer under rare earthquakes. Due to excessive structural rigidity, they cannot deform with displacement, which can lead to pipe cracking or connection detachment, directly damaging the integrity and functionality of the fire protection piping system.

[0004] Ordinary flexible connectors have limited deformation capacity and cannot meet the industry standard requirement of 1.2 times the displacement margin (i.e., need to adapt to 378mm displacement). They lack sufficient safety redundancy and still pose a risk of sealing failure and structural damage when the seismic displacement exceeds the limit. Utility Model Content

[0005] The purpose of this invention is to provide a fire-fighting pipeline connection structure for seismic isolation layers that can adapt to displacement during rare earthquakes, in order to solve the problems of limited deformation capacity of ordinary flexible connectors in the prior art, difficulty in meeting the 1.2 times displacement margin required by industry standards, and lack of sufficient safety redundancy.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fire-fighting pipe connection structure for a seismic isolation layer that adapts to displacement in rare earthquakes, comprising: a metal flexible hose, wherein the metal flexible hose has a C-shaped symmetrical structure and the body of the metal flexible hose has a main bend, both ends of the metal flexible hose are straight pipe sections, and a transition bend is formed between the main bend and the two sets of straight pipe sections.

[0007] Furthermore, the angle of the main bend is 60 degrees, and the angle of the transition bend is 30 degrees.

[0008] Furthermore, the formula for calculating the total length of the metal flexible hose is as follows:

[0009] L = 0.5 × H + 1.2 × D + A - 2 × L 法兰 ;

[0010] Where L is the total length of the metal flexible hose, H is the height of the seismic isolation pier, D is the design displacement value, and A is the installation allowance.

[0011] Furthermore, a connecting flange is installed at the end of the straight pipe section.

[0012] Furthermore, the bending radius of the metal hose is not less than 5 times the pipe diameter.

[0013] Furthermore, the metal hose is made of SUS304 stainless steel and has a pressure resistance rating of not less than 1.6MPa.

[0014] Compared with existing technologies, this utility model provides a fire-fighting pipeline connection structure for seismic isolation layers that adapts to displacement during rare earthquakes. By setting the flexible metal hose into a C-shaped symmetrical structure, it can uniformly absorb the displacement under rare earthquakes through bidirectional elastic deformation, avoiding structural damage caused by concentrated stress on one side. At the same time, the composite bending design of the transition bend and the main bend effectively disperses the stress generated by displacement, eliminating cracking or sealing failure caused by excessive local stress in the pipe body. This ensures that the fire-fighting pipeline can maintain structural integrity and normal function under extreme earthquake conditions, providing reliable seismic protection for building fire protection systems. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Metal flexible hose; 2. Straight pipe section; 3. Connecting flange; 4. Transition bend; 5. Main bend. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0020] As attached Figure 1 As shown:

[0021] Example 1:

[0022] This utility model provides a fire-fighting pipe connection structure for a seismic isolation layer that adapts to displacement in rare earthquakes, including: a metal flexible hose 1, the metal flexible hose 1 having a C-shaped symmetrical structure, and the metal flexible hose 1 having a main bend 5 in its body, the two ends of the metal flexible hose 1 being straight pipe sections 2, and a transition bend 4 forming between the main bend 5 and the two sets of straight pipe sections 2.

[0023] The main bend 5 has an angle of 60 degrees, and the transition bend 4 has an angle of 30 degrees. The characteristic feature is that the total length of the metal flexible hose 1 is calculated using the following formula:

[0024] L = 0.5 × H + 1.2 × D + A - 2 × L 法兰 ;

[0025] Where L is the total length of the metal flexible hose 1, H is the height of the seismic isolation pier, D is the design displacement value, and A is the installation allowance. 法兰 The length of connecting flange 3.

[0026] The metal flexible hose 1 has a total length of 1.3m. The hose body has a C-shaped symmetrical structure design, with each section being 0.65m long. The straight section 2 is 200mm long, the transition bend section 4 is 200mm long, and the main bend section 5 is 250mm long.

[0027] A connecting flange 3 is installed at the end of the straight pipe section 2.

[0028] The bending radius of the metal hose 1 shall not be less than 5 times the pipe diameter. The metal hose 1 shall be made of SUS304 stainless steel and the pressure resistance rating shall not be less than 1.6MPa.

[0029] With the metal flexible hose 1 as the core, the whole adopts a C-shaped symmetrical structure design, with the upper and lower sections of equal length (0.65m each), and a total length of 1.3m, forming a 500mm 180° spoon-shaped bend, which is suitable for the spatial layout of the fire protection pipeline in the vibration isolation layer.

[0030] The straight pipe section 2 is 200mm long, and the end is welded with flange 3. The flange specification matches the fire pipeline flange (such as DN100 standard flange) and is used to rigidly connect with the upper and lower fire pipeline sections or the fixed end of the support to ensure sealing performance.

[0031] The transition bend 4 is 200mm long and has a bending angle of 30°, which enables a smooth transition from the straight pipe to the main bend and avoids stress concentration caused by abrupt changes in angle.

[0032] The main bend section 5 is 250mm long and has a bending angle of 60°. The two main bend sections are symmetrically distributed and, when combined, form a total bending angle of 120°. This, in conjunction with the 30° angle of the transition bend section, enables the overall structure to adapt to large displacement deformation.

[0033] The critical dimension calculation formula for the total length of the metal flexible hose is determined through precise calculation of engineering parameters, as follows: L=0.5×H+1.2×D+A where:

[0034] L is the total length of the metal flexible hose (in this embodiment, L = 1.3m);

[0035] H is the height of the seismic isolation pier (in this project, H = 2.35m, and 0.5 × H is used to adapt to the space constraints caused by the height of the pier);

[0036] D is the design displacement value under rare earthquakes (in this project, D = 315mm, 1.2 × D is the displacement margin coefficient required by the specification, ensuring a displacement space of 378mm is reserved);

[0037] A is the installation allowance (in this embodiment, A = 55mm, used to compensate for on-site construction errors);

[0038] L 法兰 The length of the single-end connecting flange 3 is 0.154m in this embodiment.

[0039] The bending radius requirement is that the bending radius of the metal flexible hose 1 is not less than 5 times the pipe diameter (i.e., ≥5×100mm=500mm). It is pre-formed by a CNC pipe bending machine to ensure bending accuracy and avoid pipe wall damage or fatigue life reduction caused by excessive bending.

[0040] Installation and construction requirements:

[0041] The metal flexible hose 1 is made of SUS304 stainless steel. This material has excellent corrosion resistance and can adapt to the atmospheric environment of high-altitude areas (such as 1731m), avoiding rust problems during long-term use. It has stable mechanical properties, with a tensile strength ≥520MPa and an elongation ≥40%, meeting the structural strength requirements when bending deformation. It also has good high temperature resistance and can adapt to the working temperature of fire protection pipeline systems (-20℃~120℃).

[0042] The metal flexible hose 1 has a pressure resistance rating of not less than 1.6MPa, which meets the design working pressure of the fire protection piping system (usually 1.0 to 1.2MPa) and is verified by a water pressure test of 1.5 times the design pressure, 2.4MPa.

[0043] It can withstand a horizontal displacement of 315mm corresponding to a rare earthquake of magnitude 9, and maintain structural integrity and reliable sealing in a simulation test with a displacement of 472.5mm (1.5 times the design displacement); under normal maintenance conditions, its service life is ≥50 years, matching the service life of the main building structure.

[0044] Metal hose 1 is precisely processed by a factory CNC pipe bending machine to ensure that the straight pipe section length, transition bend angle of 30°, main bend angle of 60° and overall symmetry error are ≤±1°, and the bending radius error is ≤±5mm, thus avoiding the problem of insufficient precision caused by on-site processing.

[0045] On-site installation: First, fix the connecting flange 3 of the lower straight pipe section 2 and connect it to the fixed end of the pipe or support below the vibration isolation layer. Ensure that the flange sealing surface is flat, use high pressure resistant rubber gaskets (such as nitrile rubber) for sealing, and tighten the bolts evenly (torque value 40-50 N·m).

[0046] When installing the upper straight pipe section 2, a horizontal displacement space of 378mm (i.e., 1.2×315mm) is reserved to avoid initial installation stress.

[0047] Seismic bracing is installed along the length of the metal flexible hose 1, with a bracing spacing of ≤3m. The bracing is connected to the hose body with a flexible clamp, allowing the hose body to move freely during an earthquake while limiting excessive shaking.

[0048] Acceptance criteria: After installation, the following tests will be conducted to verify performance:

[0049] Water pressure test: Apply 1.5 times the design pressure (2.4MPa) and hold the pressure for 30 minutes without leakage;

[0050] Displacement simulation test: A horizontal displacement of 472.5 mm (1.5 × 315 mm) was applied using specialized equipment. After 5 cycles, the pipe body was checked for cracks, the flanges were not loose, and the seals were leak-free.

[0051] Working principle: When a rare earthquake occurs, the isolation layer undergoes a large horizontal displacement, such as 315mm. The flexible metal hose 1 absorbs the displacement through the elastic deformation of its C-shaped symmetrical structure.

[0052] The main bending segment 5 serves as the main deformation zone, adapting to most of the displacement through minor adjustments to its bending angle (±3°~5°).

[0053] The transition bend section 4 is an auxiliary buffer to avoid stress concentration at the connection between the straight pipe section and the main bend section.

[0054] The symmetrical structural design ensures that the upper and lower sections are subjected to balanced forces, preventing structural failure caused by excessive deformation on one side.

[0055] The elastic properties of SUS304 stainless steel allow the tube to partially recover its original shape after displacement, reducing the impact of residual deformation on subsequent use.

[0056] Relying on the C-shaped symmetrical structure of the flexible metal hose 1, it can uniformly absorb the displacement under rare earthquakes through bidirectional elastic deformation, avoiding structural damage caused by concentrated stress on one side. At the same time, the composite bending design of the transition bend 4 and the main bend 5 effectively disperses the stress generated by displacement, preventing cracking or sealing failure caused by excessive local stress in the pipe body. This ensures that the fire protection pipeline can maintain structural integrity and normal function under extreme earthquake conditions, providing reliable seismic protection for the building's fire protection system.

[0057] The overall structural design of the metal flexible hose 1 perfectly adapts to the space constraints of high seismic isolation piers and large-size supports. The straight pipe section 2 provides ample operating space for on-site installation and can accurately connect to the pipe interfaces at the upper and lower ends of the pier, allowing installation to be completed without additional adjustments to the on-site working conditions. At the same time, the metal flexible hose 1 is made of SUS304 stainless steel, which has excellent corrosion resistance and environmental adaptability, and can work stably in the special environment of high-altitude areas, solving the problems of traditional structures being difficult to install under special working conditions and easily failing due to environmental influences.

[0058] The connecting flange 3 at the end of the straight pipe section 2 is tightly connected to the pipe / support fixed end through a high-pressure resistant sealing gasket. With the evenly tightened bolts, it can effectively avoid the defects of traditional welded connections that are prone to leakage, ensuring that the fire protection pipeline system is leak-free for a long time. In addition, the metal hose 1 adopts a factory prefabrication process, which can accurately control the structural parameters of each section, avoid the precision errors caused by on-site processing, greatly improve the stability of installation quality, and reduce the later maintenance costs.

[0059] The material selection and structural design of the metal flexible hose 1 can reduce fatigue damage to the hose body during use, significantly extend its service life, and match the service life of the main building structure. At the same time, compared with imported similar products, this solution greatly reduces production costs by optimizing materials and processes, and does not require separate design for different working conditions. It has strong versatility and can further reduce engineering design and procurement costs, achieving a balance between performance and economy.

[0060] The factory prefabrication mode of metal hose 1 reduces on-site processing procedures, lowers the construction difficulty in complex environments such as high altitude, and shortens the construction cycle. On-site installation only requires fixing the connecting flange 3 according to the steps, reserving displacement space and setting up anti-seismic supports. The operation is simple, and the key performance can be verified through standardized testing. The construction quality is easy to control, avoiding the quality fluctuation problems caused by the process limitations of traditional on-site processing.

[0061] The connection structure of this embodiment can be widely used in seismic isolation buildings in areas with seismic fortification intensity of 8 degrees and above. It is especially suitable for engineering scenarios with high piers, large displacement requirements, or high-altitude environments, providing reliable seismic protection for the fire protection pipeline system of the seismic isolation layer.

[0062] The above description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fire-fighting pipeline connection structure for a seismic isolation layer adapted to displacement during rare earthquakes, characterized in that, include: Metal hose (1), the metal hose (1) has a C-shaped symmetrical structure, and the metal hose (1) has a main bend (5) formed in the body of the hose, the two ends of the metal hose (1) are straight pipe sections (2), and a transition bend (4) is formed between the main bend (5) and the two sets of straight pipe sections (2).

2. The fire-fighting pipeline connection structure of the seismic isolation layer adapted to rare earthquake displacement as described in claim 1, characterized in that, The angle of the main curve (5) is 60 degrees, and the angle of the transition curve (4) is 30 degrees.

3. The fire-fighting pipeline connection structure of the seismic isolation layer adapted to rare earthquake displacement as described in claim 2, characterized in that, The formula for calculating the total length of the metal hose (1) is as follows: L=0.5×H+1.2×D+A-2×L 法兰 ; Where L is the total length of the metal flexible hose (1), H is the height of the seismic isolation pier, D is the design displacement value, A is the installation allowance, and L 法兰 The length of the connecting flange (3).

4. The fire-fighting pipeline connection structure of the seismic isolation layer adapted to rare earthquake displacement as described in claim 1, characterized in that, A connecting flange (3) is installed at the end of the straight pipe section (2).

5. A fire-fighting pipeline connection structure for seismic isolation layers adapted to rare earthquake displacement as described in claim 1, characterized in that, The bending radius of the metal hose (1) shall not be less than 5 times the pipe diameter.

6. The fire-fighting pipeline connection structure of the seismic isolation layer adapted to rare earthquake displacement as described in claim 1, characterized in that, The metal hose (1) is made of SUS304 stainless steel and has a pressure resistance rating of not less than 1.6MPa.

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