Fire-fighting pipe connecting assembly for modular integrated building and fire-fighting pipe

Abstract

The utility model relates to the technical field of fire-fighting equipment, in particular to a fire-fighting pipe connecting assembly and a fire-fighting pipe for a modularized integrated building, which comprises a flexible corrugated pipe, connecting ends are respectively and fixedly arranged at two axial ends of the flexible corrugated pipe, and connecting joints are axially arranged at the connecting ends. The connecting joint extends outwards from the end, away from the flexible corrugated pipe, of the connecting end. The connecting joint is divided into a screw thread connecting head and a hoop connecting head, and the screw thread connecting head and the hoop connecting head are selectively and detachably connected with the fire-fighting pipe fitting. Threads are arranged at the two ends of the screw thread connector, and the screw thread connector can be in threaded connection with the connecting end and the fire-fighting pipe fitting through self-rotation. Compared with the prior art, the flexible corrugated pipe has the beneficial effects that the flexible corrugated pipe is combined with the screw thread connector or the clamp connector, so that the flexible corrugated pipe can be conveniently connected with the fire-fighting pipe fitting, the fire-fighting pipe fitting does not need to rotate, the applicability of various connectors is good, and the flexible corrugated pipe can be directly connected with the fire-fighting pipe fitting, so that the positions where water possibly leaks are reduced.

Description

Technical Field

[0001] This utility model relates to the field of fire protection equipment technology, and in particular to a fire pipe connection component and fire pipe for modular integrated buildings. Background Technology

[0002] Modular integrated construction breaks down buildings into modular "units." The structure, decoration, water and electricity systems, equipment pipelines, and bathroom facilities of these modules are efficiently completed in the factory. On-site, these modules are quickly assembled into a complete building using reliable connection technologies. This technology moves construction from the construction site to the factory, significantly shortening the construction period and reducing construction difficulty, achieving "building houses like building cars." It is currently the greenest construction method with the highest degree of industrialization. Fire protection piping systems, as one of the key technologies in these projects, have seen their application prospects expand further with the development of prefabricated building technology. Among these technologies, the connection of fire protection pipe fittings between prefabricated modules has become a pain point. In prefabricated modules, fire protection pipe fittings are already installed and fixed in pre-reserved positions. These fittings are usually non-rotatable, and because prefabricated modules are mass-produced, the types of fire protection pipe fittings within each module are not entirely the same. Therefore, traditional technology uses grooved or threaded connections between the module pipes. However, this connection method is prone to deviations when the integrated modules are positioned, leading to misalignment or gaps in the pipes.

[0003] In the prior art, Chinese patent CN210484864U proposes a novel flexible fire-fighting metal hose, including a left-end connecting joint, a left-end constricted collar, a flexible annular corrugated pipe, a flexible mesh sleeve, a right-end constricted collar, and a right-end connecting joint. The left-end connecting nut and right-end connecting nut, the left-end sealing gasket and right-end sealing gasket, the left-end connecting joint and right-end connecting joint, and the left-end constricted collar and right-end constricted collar are symmetrically arranged. However, this novel flexible fire-fighting metal hose still has the following problems: 1. Inconvenience: the fire-fighting pipe fittings in each box-type module are fixed, making it difficult to rotate the pipes when connecting them by threads; 2. Poor applicability: the fire-fighting pipe fittings in the box-type modules have different specifications, requiring transition joints for connection; 3. Poor connection effect: using connecting components requires additional transition joints, increasing the potential leakage points in the fire-fighting pipe fittings.

[0004] Therefore, there is an urgent need for a fire pipe connection assembly and fire pipe that does not require rotating pipes, has a reasonable structure, and good airtightness for modular integrated buildings. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a fire pipe connection component and fire pipe for modular integrated buildings, which solves the technical problems of the prior art that require rotating pipes and have poor applicability and poor connection effect.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] In a first aspect, this utility model provides a fire pipe connection assembly for modular integrated buildings, comprising a flexible corrugated pipe, with connecting ends fixedly provided at both axial ends of the flexible corrugated pipe, and connecting joints provided axially at the connecting ends, extending outward from the end of the connecting end away from the flexible corrugated pipe; the connecting joints are divided into threaded connectors and clamp connectors, which can be selectively and detachably connected to fire pipe fittings; the threaded connectors have threads at both ends, enabling them to be threadedly connected to the connecting ends and fire pipe fittings by rotating themselves; the clamp connectors include a clamp, a connecting pipe, and a matching ring, with both ends of the matching ring abutting against the connecting pipe and the fire pipe fitting, and all three having the same diameter; one end of the connecting pipe is fixedly connected to the connecting end, and the other end is detachably connected to the clamp; the clamp is correspondingly sleeved outside the matching ring and can detachably connect the fire pipe fitting to the connecting pipe.

[0010] Optionally, threaded connectors are suitable for fire-fighting pipe fittings with a pipe diameter of DN50mm or less, while clamp connectors are suitable for fire-fighting pipe fittings with a pipe diameter greater than DN50mm.

[0011] Optionally, a connecting ring is provided at the end of the connecting end near the flexible corrugated pipe, and the flexible corrugated pipe is fitted over the connecting ring in a clearance fit manner.

[0012] Optionally, the fire pipe connection assembly also includes two port collars, which are fixedly sleeved on the outside of the flexible corrugated pipe and the connecting ring. The port collars are constructed as annular structures that gradually narrow from the connecting end to the flexible corrugated pipe axially.

[0013] Optionally, the port collar is fixedly connected to the flexible corrugated pipe and the connecting end by a single-pass welding process, and the welding shape at the connection edge of the port collar, the flexible corrugated pipe and the connecting end is annular.

[0014] Optionally, the flexible corrugated pipe is also provided with a metal mesh sleeve wrapped around the flexible corrugated pipe, which is woven from 304 stainless steel wire.

[0015] Optionally, the flexible corrugated pipe has a corrugated shape along its axial direction, the corrugated shape including crests and troughs, the crests and troughs are alternately distributed axially and the wall thickness is the same at the crests and troughs.

[0016] Optionally, the flexible corrugated pipe is made of 316 stainless steel, and the bending radius of the flexible corrugated pipe is 80-100mm.

[0017] Secondly, this utility model embodiment provides a fire-fighting pipe, including a fire-fighting pipe connecting assembly and two fire-fighting pipe fittings; the fire-fighting pipe fittings have a reserved connection length of 250-350mm at the fire-fighting pipe connecting assembly. 的 Within this range, the included angle between the central axes of the fire pipe fittings located at both ends of the fire pipe connection assembly is within the range of 0°-30°.

[0018] (III) Beneficial Effects

[0019] The beneficial effects of this utility model are:

[0020] This utility model discloses a fire pipe connection assembly and fire pipe for modular integrated buildings, including a flexible corrugated pipe. Connecting ends are fixedly provided at both axial ends of the flexible corrugated pipe, and connecting joints are provided axially at the connecting ends. The connecting joints extend outward from the end of the connecting end furthest from the flexible corrugated pipe. The connecting joints are divided into threaded connectors and clamp connectors, which can be selectively and detachably connected to fire pipe fittings. The threaded connectors have threads at both ends, allowing them to be threadedly connected to the connecting ends and fire pipe fittings through self-rotation. The clamp connectors include a clamp, a connecting pipe, and a matching ring. The matching ring abuts against the connecting pipe and the fire pipe fitting at both ends, and all three have the same diameter. One end of the connecting pipe is fixedly connected to the connecting end, and the other end is detachably connected to the clamp. The clamp is correspondingly sleeved outside the matching ring and can detachably connect the fire pipe fitting to the connecting pipe. Compared to existing technologies, the combination of flexible corrugated pipes with threaded or clamp connectors facilitates connection to fire-fighting pipe fittings without requiring the pipe fittings to rotate. The various connectors offer good applicability, and the pipes can be directly connected to fire-fighting pipe fittings, reducing potential leakage points. Attached Figure Description

[0021] Figure 1 This is a partial schematic diagram of Embodiment 1 of the fire-fighting pipe of this utility model, wherein the connecting joint is a threaded joint, and the fire-fighting pipe fittings on both sides are not shown in order to clearly show the structure;

[0022] Figure 2 This is a partial schematic diagram of Embodiment 2 of the fire-fighting pipe of this utility model, wherein the connecting joint is a clamp connector, and the fire-fighting pipe fittings on both sides are not shown in order to clearly show the structure;

[0023] Figure 3 for Figure 2 The image shows a side view of a clamp connector in a fire hose, where the mating ring is not shown for clarity of the structure.

[0024] [Explanation of Labels in the Attached Image]

[0025] 1: Flexible corrugated pipe; 2: Connecting end; 3: Fire protection pipe fitting; 4: Threaded connector; 5: Clamp connector; 6: Clamp; 7: Butt joint; 8: Matching ring; 9: Port collar; 10: Connecting ring; 11: Metal mesh sleeve. Detailed Implementation

[0026] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1:

[0028] Reference Figure 1 This embodiment provides a fire pipe connection assembly and a fire pipe for modular integrated buildings, used for connecting two fire pipe fittings 3. Specifically, the fire pipe connection assembly for modular integrated buildings in this embodiment includes a flexible corrugated pipe 1, a connecting end 2, and a connecting joint, as detailed below.

[0029] In this embodiment, the flexible corrugated pipe 1 has connecting ends 2 fixedly provided at both axial ends. Each connecting end 2 has a connecting joint extending outward from the end of the connecting end 2 furthest from the flexible corrugated pipe 1. The connecting joint is a threaded connector 4, with threads at both ends, allowing it to rotate and connect threadedly to the connecting end 2 and the fire-fighting pipe fitting 3. The fixed connection methods include, but are not limited to, welding, bonding, and riveting. The flexible corrugated pipe 1 is a bendable corrugated pipe. Connecting ends 2 are fixedly connected to both ends of the flexible corrugated pipe 1 along its axial direction. Connecting joints are axially connected to the two connecting ends 2. The direction of the connecting joints is outward away from the flexible corrugated pipe 1. In this embodiment, the threaded connector 4 has an external thread at the connection with the connecting end 2, while the corresponding connecting end 2 has an internal thread. The threaded connector 4 has an internal thread at the connection with the fire-fighting pipe fitting 3, while the corresponding fire-fighting pipe fitting 3 has an external thread. Therefore, when water flows through the fire-fighting pipe fitting 3, the diameter of the connecting joints on both sides is larger than that of the fire-fighting pipe fitting 3, and the diameter of the connecting end 2 is larger than that of the connecting joint. The water flow will not be restricted at the fire-fighting pipe connection assembly, resulting in additional water pressure and the risk of leakage at the fire-fighting pipe connection assembly. However, this is only one implementation method. The threaded connector 4 can also be larger than the connecting end 2, with the diameter of the threaded connector 4 smaller than the diameter of the fire-fighting pipe fitting 3; or the diameter of the threaded connector 4 can be larger than the diameters of both the connecting end 2 and the fire-fighting pipe fitting 3, with the diameter of the threaded connector 4 smaller than the diameters of both the connecting end 2 and the fire-fighting pipe fitting 3. All of these methods can achieve the connection with the fire-fighting pipe fitting 3. Therefore, the threaded connector 4 can rotate itself to screw into and out of the fire-fighting pipe fittings 3 at both ends, avoiding the need to rotate the fire-fighting pipe fitting 3. Furthermore, the fire-fighting pipe connection assembly does not require additional accessories; the size of the threaded connector 4 matches the fire-fighting pipe fitting 3, thus achieving the connection.

[0030] Preferably, the threaded connector 4 is suitable for fire-fighting pipe fittings 3 with a pipe diameter of DN50mm or less. Threaded connectors are easier to rotate when the pipe diameter is small. As the pipe diameter increases, the difficulty of thread processing and sealing also increases. Moreover, the connection of large-diameter pipes requires greater torque. Therefore, the threaded connector 4 is suitable for fire-fighting pipe fittings 3 with a pipe diameter of DN50mm or less.

[0031] Preferably, to achieve the connection between the connecting end 2 and the flexible corrugated pipe 1, a connecting ring 10 is provided at the end of the connecting end 2 near the flexible corrugated pipe 1. The flexible corrugated pipe 1 is fitted over the connecting ring 10 with a clearance fit. The connecting ring 10 and the connecting end 2 can be integrally formed, or they can be connected by welding and bonding. The connecting ring 10 and the flexible corrugated pipe 1 are connected by a clearance fit, and the inner diameter of the flexible corrugated pipe 1 is larger than the inner diameter of the connecting ring 10. By setting the connecting ring 10, the direct impact force of water flow into the flexible corrugated pipe 1 can be reduced, and the risk of the flexible corrugated pipe 1 detaching from the connecting end 2 can be reduced.

[0032] Preferably, to enhance the sealing between the connecting end 2 and the flexible corrugated pipe 1, the fire pipe connection assembly further includes two port collars 9. The port collars 9 are fixedly sleeved on the outside of the flexible corrugated pipe 1 and the connecting ring 10. The port collars 9 are constructed as annular structures that gradually narrow from the connecting end 2 to the flexible corrugated pipe 1. The port collars 9 on one end of the flexible corrugated pipe 1 and the connecting ring 10 can compact the connection position, and the gradually narrowing design of the port collars 9 can more firmly fix the flexible corrugated pipe 1. The connection method for the fixed connection between the port collars 9 and one end of the flexible corrugated pipe 1 and the connecting ring 10 can be welding, bonding, or snap-fit. In snap-fit, the narrowest part of the port collar 9 fits precisely onto the end of the flexible corrugated pipe 1, forming a fixed connection.

[0033] Preferably, the port collar 9 is fixedly connected to the flexible corrugated pipe 1 and the connecting end 2 by a single-pass welding process, and the welded edge of the port collar 9 to the flexible corrugated pipe 1 and the connecting end 2 is annular. This single-pass welding method ensures a seamless connection between the port collar 9 and the flexible corrugated pipe 1 and the connecting end 2, reducing the possibility of leakage in the fire pipe connection assembly. Furthermore, the annular welded edge of the port collar 9 to the flexible corrugated pipe 1 and the connecting end 2 enhances the sealing between the connecting end 2 and the flexible corrugated pipe 1.

[0034] Preferably, the flexible corrugated pipe 1 is further provided with a metal mesh sleeve 11 wrapped around the flexible corrugated pipe 1. The metal mesh sleeve 11 is woven from 304 stainless steel wire. The metal mesh sleeve 11 on the outside of the flexible corrugated pipe 1 can add a layer of protection to the flexible corrugated pipe 1 without affecting its own flexibility. The metal mesh sleeve 11 is woven from 304 stainless steel wire, which has obvious anti-corrosion properties, high rigidity, and durability, while preventing external damage to the flexible corrugated pipe 1.

[0035] Preferably, the flexible corrugated pipe 1 has a corrugated shape along its axial direction, the corrugation shape including crests and troughs, the crests and troughs are alternately distributed axially and the wall thickness is the same at the crests and troughs. The corrugated shape of the flexible corrugated pipe 1 along its axial direction allows the flexible corrugated pipe 1 to have a larger bending space. When connected to the fire-fighting pipe fitting 3, the corrugated shape can also have a certain tensile property, and the length can be stretched or compressed. Therefore, the flexible corrugated pipe 1 has good flexibility and ductility.

[0036] Preferably, to enhance the strength of the flexible corrugated pipe 1, the flexible corrugated pipe 1 is made of 316 stainless steel, and the bending radius of the flexible corrugated pipe 1 is 80-100mm. 316 stainless steel has better corrosion resistance; therefore, when in contact with moisture inside the fire-fighting pipe fitting 3, the flexible corrugated pipe 1 is more durable, and the 316 stainless steel also has high strength. The bending radius of the flexible corrugated pipe 1 is 80-100mm, thus allowing two fire-fighting pipe fittings 3 to be connected using this fire-fighting pipe connection assembly when they are a certain distance apart but not in a straight line.

[0037] The fire-fighting pipe in this embodiment includes a fire-fighting pipe connection assembly and two fire-fighting pipe fittings 3. The fire-fighting pipe fittings 3 have a pre-installed connection length of 250-350mm at the fire-fighting pipe connection assembly. 的 Within the specified range, the included angle between the central axes of the fire pipe fittings 3 located at both ends of the fire pipe connection assembly is between 0° and 30°. The fire pipe connection assembly has a certain degree of flexibility; therefore, the pre-reserved splicing length of the fire pipe fitting 3 at the fire pipe connection assembly is between 250-350mm. 的 Within this range, and given the flexibility of the fire pipe connection assembly, the fire pipe connection assembly can connect the fire pipe fittings 3 located at both ends of the fire pipe connection assembly within the range of 0°-30° of the included angle of their central axes.

[0038] Example 2:

[0039] The difference between this embodiment and embodiment 1 is that the threaded connector 4 in embodiment 1 is replaced by a clamp connector 5, and other related structural adaptation modifications are made as follows.

[0040] Reference Figure 2 and Figure 3In this embodiment, the connecting joint is a clamp connector 5, which is detachably connected to the fire-fighting pipe fitting 3. The clamp connector 5 includes a clamp 6, a connecting pipe 7, and a matching ring 8. The matching ring 8 abuts against the connecting pipe 7 and the fire-fighting pipe fitting 3 at both ends, and all three have the same outer diameter. One end of the connecting pipe 7 is fixedly connected to the connecting end 2, and the other end is detachably connected to the clamp 6. The clamp 6 is correspondingly sleeved on the outside of the matching ring 8 and can detachably connect the fire-fighting pipe fitting 3 to the connecting pipe 7. One end of the connecting pipe 7 in the clamp connector 5 is fixedly connected to the connecting end 2, and the fixed connection can be welding, bonding, or clamping. The outer diameter of the matching ring 8 is the same as that of the connecting pipe 7 and the fire-fighting pipe fitting 3. During installation, the clamp 6 is connected to the fire-fighting pipe fitting 3 and the connecting pipe 7. The fire-fighting pipe fitting 3 and the connecting pipe 7 hold the matching ring 8. Annular grooves are machined on the fire-fighting pipe fitting 3 and the connecting pipe 7. The matching ring 8 is located between the fire-fighting pipe fitting 3 and the connecting pipe 7 and abuts against them. Rubber pads can also be set at the abutting parts to increase the friction and sealing between the various parts. Furthermore, as the fluid pressure inside the pipe increases, its sealing performance is correspondingly enhanced.

[0041] Preferably, the clamp connector 5 is suitable for fire-fighting pipe fittings 3 with a pipe diameter greater than DN50mm. The clamp 6 is suitable for pipes with larger diameters because it can provide stronger tightening force and better sealing effect, and is suitable for withstanding greater working pressure. Moreover, the clamp connector 5 is easy to install and does not require rotating the fire-fighting pipe fittings 3 at both ends.

[0042] In summary, compared with existing technologies, this fire pipe connection assembly facilitates connection with fire pipe fittings 3 by using a combination of flexible corrugated pipe 1 and connecting joint, without requiring the fire pipe fittings 3 to rotate. It has good applicability to various connectors and can be directly connected to fire pipe fittings 3, reducing the possible locations of water leakage.

[0043] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0045] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A fire pipe connection assembly for modular integrated buildings, characterized in that, Includes a flexible corrugated pipe (1), with connecting ends (2) fixedly provided at both axial ends of the flexible corrugated pipe (1), and connecting joints provided axially at the connecting ends (2), with the connecting joints extending outward from the end of the connecting ends (2) away from the flexible corrugated pipe (1). The connecting joint is divided into a threaded connector (4) and a clamp connector (5), and the threaded connector (4) and the clamp connector (5) can be selectively and detachably connected to the fire-fighting pipe fitting (3); The threaded connector (4) has threads at both ends, and can be threadedly connected to the connecting end (2) and the fire-fighting pipe fitting (3) by rotating itself; The clamp connector (5) includes a clamp (6), a connecting pipe (7), and a matching ring (8). The two ends of the matching ring (8) abut against one end of the connecting pipe (7) and the fire-fighting pipe fitting (3), and the three have the same outer diameter. The other end of the connecting pipe (7) is fixedly connected to the connecting end (2). The clamp (6) is correspondingly sleeved on the outside of the matching ring (8) and can detachably connect the fire-fighting pipe fitting (3) and the connecting pipe (7).

2. The fire pipe connection assembly for modular integrated buildings as described in claim 1, characterized in that, The threaded connector (4) is applicable to fire-fighting pipe fittings (3) with a pipe diameter less than or equal to DN50mm, and the clamp connector (5) is applicable to fire-fighting pipe fittings (3) with a pipe diameter greater than DN50mm.

3. The fire pipe connection assembly for modular integrated buildings as described in claim 1, characterized in that, The end of the connecting end (2) near the flexible corrugated pipe (1) is also provided with a connecting ring (10), and the flexible corrugated pipe (1) is sleeved on the connecting ring (10) in a clearance fit manner.

4. The fire pipe connection assembly for modular integrated buildings as described in claim 3, characterized in that, The fire pipe connection assembly also includes two port collars (9), which are fixedly sleeved on the outside of the flexible corrugated pipe (1) and the connecting ring (10). The port collars (9) are constructed as annular structures that gradually narrow from the connecting end (2) to the flexible corrugated pipe (1).

5. The fire pipe connection assembly for modular integrated buildings as described in claim 4, characterized in that, The port collar (9) is fixedly connected to the flexible corrugated pipe (1) and the connecting end (2) by a single-pass welding and one-time forming. The welded shape at the edge of the connection between the port collar (9) and the flexible corrugated pipe (1) and the connecting end (2) is annular.

6. The fire pipe connection assembly for modular integrated buildings as described in claim 1, characterized in that, The flexible corrugated pipe (1) is also provided with a metal mesh sleeve (11) that wraps around the flexible corrugated pipe (1), and the metal mesh sleeve (11) is woven from 304 stainless steel wire.

7. The fire pipe connection assembly for modular integrated buildings as described in claim 1, characterized in that, The flexible corrugated pipe (1) has a corrugated shape along its axial direction, the corrugated shape including crests and troughs, the crests and troughs are axially alternating and the wall thickness is the same at the crests and troughs.

8. The fire pipe connection assembly for modular integrated buildings as described in claim 1, characterized in that, The flexible corrugated pipe (1) is made of 316 stainless steel and the bending radius of the flexible corrugated pipe (1) is 80-100mm.

9. A fire-fighting pipe, characterized in that, Includes the fire pipe connection assembly for modular integrated buildings as described in any one of claims 1-8 and two fire pipe fittings (3); The fire-fighting pipe fitting (3) has a reserved connection length of 250-350mm at the fire-fighting pipe connection assembly, and the included angle of the central axis of the fire-fighting pipe fitting (3) at both ends of the fire-fighting pipe connection assembly is in the range of 0°-30°.

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