Novel combined pipe fitting suitable for modular integrated building pipeline to penetrate through floor slab

Abstract

The utility model relates to a novel combined pipe fitting suitable for a modular integrated building pipeline to penetrate through a floor slab. The novel combined pipe fitting comprises an embedded water stop joint, an embedded sleeve, a connecting straight pipe and a socket fixing pipe fitting. A first extension plate is formed at a lower bellmouth of the pre-embedded water stop section, the pre-embedded sleeve comprises a sleeve main body, an upper port of the sleeve main body is sleeved with a waterproof rubber ring, and a second extension plate is formed at a lower port of the sleeve main body; the connecting straight pipe comprises a straight pipe section, the straight pipe section penetrates through the embedded sleeve and then is connected with the lower bell mouth in an inserted mode, and a third extension plate is formed at the lower end opening of the straight pipe section; the socket fixing pipe fitting comprises a pipe fitting body, a fourth extension plate is formed at the upper end opening of the pipe fitting body, the second extension plate, the third extension plate and the fourth extension plate are sequentially connected in an abutting mode from top to bottom, and the outer edge of the fourth extension plate is detachably connected with the second extension plate. According to the novel combined pipe fitting, rapid installation of the pipeline penetrating floor combined pipe fitting is achieved, and meanwhile the problem of leakage of accumulated water in a bedding layer and the problem of secondary pollution caused by sleeve blocking are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of modular integrated buildings, in particular to a novel combined pipe fitting suitable for pipelines passing through floor slabs of modular integrated buildings. Background Art

[0002] Concrete modular integrated buildings use standard modules as basic units. The production of the module body, installation of sanitary ware, installation of mechanical and electrical pipelines, and overall decoration are completed in the factory. Only the modules are assembled and the pipelines between modules are connected on site. It is a new type of rapid construction method with the advantages of high assembly integration, fast construction efficiency, and good construction quality.

[0003] Modular integrated buildings are a new type of industrialized construction method that has gradually emerged in China. However, the existing pipe fittings and pipe connection methods for passing through floor slabs are no longer suitable for new modular integrated buildings. The main problems are as follows: (1) Concrete modular integrated buildings are integrated in factories and hoisted and assembled on site. A 20mm gap needs to be left between the upper and lower modules. Usually, a 20mm thick cement mortar strip is applied locally on the cast-in-place slab surface for leveling. This gap is called the mortar layer. In order to adjust the deviation between the pipes after the upper and lower modules are hoisted and to facilitate pipe connection, it is usually adopted to embed a water stop joint in the bottom plate of the upper module and reserve a steel casing two sizes larger than the inner pipe on the top plate of the lower module. Although this method can realize pipe connection, the gap between the pipe and the steel casing needs to be sealed by on-site construction personnel from the top plate of the lower module. This operation is relatively difficult to implement and is likely to cause secondary pollution to the finished wall and floor of the module. (2) Due to weather reasons or construction needs, water may accumulate in the mortar layer during the construction process. If the traditional steel casing is passed through the floor slab, the construction workers cannot completely seal the lower part, which will cause the water in the mortar layer to leak along the gap between the pipe and the inner wall of the steel casing, causing pollution to the indoor decorated walls, floors and ceilings.

[0004] Therefore, there is an urgent need to provide a new type of combined pipe fitting that is easy to assemble and will not cause secondary pollution and is suitable for modular integrated building pipelines to pass through floor slabs. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a new type of combined pipe fitting suitable for pipelines passing through floor slabs of modular integrated buildings, which solves the technical problems that the on-site construction process of existing pipeline connection components is complicated and easily causes secondary pollution.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0009] The utility model provides a new type of combined pipe fitting suitable for pipelines passing through floor slabs of modular integrated buildings, including:

[0010] The embedded water stop joint is used to be arranged in the bottom plate of the upper module, and its lower socket forms the first extension plate;

[0011] The embedded sleeve is used to be arranged in the top plate of the lower module, including a sleeve body, the upper end of the sleeve body is sleeved with a waterproof rubber ring, the first extension plate is abutted against the waterproof rubber ring up and down, the lower end of the sleeve body forms a second extension plate, and a connection structure is arranged on the bottom surface of the outer edge of the second extension plate;

[0012] A connecting straight pipe includes a straight pipe section, the upper end of which passes through the embedded casing and is plugged into the lower socket, and the lower end of the straight pipe section forms a third extension plate;

[0013] The socket fixed pipe fitting comprises a pipe fitting body, the upper end of which forms a fourth extension plate, the second extension plate, the third extension plate and the fourth extension plate are abutted up and down in sequence, and the outer edge of the fourth extension plate is detachably connected to the connection structure on the second extension plate.

[0014] Optionally, the inner diameter and the outer diameter of the upper end of the straight pipe section remain unchanged, and the inner diameter and the outer diameter of the lower end of the straight pipe section gradually decrease.

[0015] Optionally, a first annular groove is provided on the lower surface of the third epitaxial plate, and a sealing rubber pad is provided in the first annular groove to form a sealed connection between the third epitaxial plate and the fourth epitaxial plate.

[0016] Optionally, the connection structure on the bottom surface of the second epitaxial plate is a spun connection groove, a first spun fixing piece is arranged on the inner wall surface of the spun connection groove, a second spun fixing piece is arranged on the outer edge of the fourth epitaxial plate, and the first spun fixing piece is spun connected to the second spun fixing piece.

[0017] Optionally, a sealing rubber ring is provided in the spun connection groove on the bottom surface of the second epitaxial plate to seal the gap between the second spun fixing member and the first spun fixing member.

[0018] Optionally, a second annular groove is provided on the upper surface of the fourth extension plate, fireproof mud is provided in the second annular groove, and the fireproof mud abuts against the third extension plate from top to bottom;

[0019] The outer periphery of the pipe body is provided with a fire-blocking ring.

[0020] Optionally, the upper opening of the waterproof rubber ring may be covered with a protective cover.

[0021] Optionally, the embedded water stop joint further comprises an upper bearing and a water stop wing ring, and the upper bearing, the water stop wing ring and the lower bearing are sequentially connected from top to bottom;

[0022] The upper socket of the embedded water-stop joint is plugged into the drainage riser of the upper module, and the lower port of the socket fixing pipe is plugged into the drainage riser of the lower module.

[0023] (III) Beneficial effects

[0024] The beneficial effects of the utility model are as follows: the utility model is a new type of combined pipe fitting suitable for pipelines passing through floor slabs of modular integrated buildings, comprising: a pre-buried water-stop joint, which is used to be arranged in the bottom plate of the upper module, and its lower socket forms a first extension plate; a pre-buried sleeve, which is used to be arranged in the top plate of the lower module, comprising a sleeve body, the upper port of the sleeve body is sleeved with a waterproof rubber ring, the first extension plate and the waterproof rubber ring are abutted up and down, the lower port of the sleeve body forms a second extension plate, and a connecting structure is provided on the bottom surface of the outer edge of the second extension plate; a connecting straight pipe, comprising a straight pipe section, the upper end of the straight pipe section passes through the pre-buried sleeve and is plugged into the lower socket, and the lower port of the straight pipe section forms a third extension plate; a socket fixing pipe fitting, comprising a pipe fitting body, the upper port of the pipe fitting body forms a fourth extension plate, the second extension plate, the third extension plate, and the fourth extension plate are abutted up and down in sequence, and the fourth extension plate The outer edge of the extension plate is detachably connected to the connecting structure on the second extension plate. Compared with the prior art, the embedded water-stop joint is embedded in the bottom plate of the upper module, and the embedded sleeve is embedded in the top plate of the lower module. After the upper module is hoisted, the embedded water-stop joint is located above the embedded sleeve and squeezes the waterproof rubber ring on the embedded sleeve. The waterproof rubber ring is used to isolate the accumulated water in the mortar layer, thereby preventing the accumulated water from entering the embedded sleeve. The connecting straight pipe and the socket fixing pipe fitting are installed in the lower module to connect the embedded water-stop joint and the socket fixing pipe fitting, thereby forming a connecting passage for the drainage risers of the upper and lower modules. The utility model saves the on-site casing sealing process through the combination of the above four components, realizes the rapid installation of the pipeline through the floor slab combined pipe fittings, and at the same time solves the leakage problem of water accumulation in the mortar layer and the secondary pollution problem caused by casing sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional schematic diagram of a new type of combined pipe fitting suitable for pipelines passing through floor slabs of modular integrated buildings according to the utility model;

[0026] Figure 2 It is a structural schematic diagram of the embedded water stop joint of the new type of combined pipe fittings suitable for modular integrated building pipelines passing through floor slabs of the utility model;

[0027] Figure 3 It is a cross-sectional schematic diagram of the embedded sleeve of the new type of combined pipe fittings suitable for modular integrated building pipelines passing through floor slabs of the utility model;

[0028] Figure 4 It is a cross-sectional schematic diagram of a connecting straight pipe of a new type of combined pipe fitting suitable for modular integrated building pipelines passing through floor slabs of the utility model;

[0029] Figure 5 It is a cross-sectional schematic diagram of a socket fixing pipe fitting of a new type of combined pipe fitting suitable for modular integrated building pipelines passing through floor slabs of the utility model;

[0030] Figure 6 The utility model is a structural schematic diagram of a new type of combined pipe fitting suitable for pipelines passing through floors of modular integrated buildings when it is installed in a standardized module.

[0031] [Description of Reference Numerals]

[0032] 1: embedded water stop joint; 11: upper bearing; 12: water stop wing ring; 13: lower bearing; 14: first extension plate;

[0033] 2: embedded casing; 21: casing body; 22: water-proof rubber ring; 23: second extension plate; 24: first spinning fixing piece; 25: sealing rubber ring;

[0034] 3: connecting straight pipe; 31: straight pipe section; 32: third extension plate; 33: sealing rubber pad;

[0035] 4: socket fixing pipe fitting; 41: pipe fitting body; 42: fourth extension plate; 43: second spinning fixing piece; 44: fireproof mud; 45: fireproof ring;

[0036] 6: Bottom plate;

[0037] 7: Top plate;

[0038] 8: Cast-in-place layer;

[0039] 9: Sitting layer. DETAILED DESCRIPTION

[0040] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0041] Reference Figure 1 , Figure 2 and Figure 6 This embodiment provides a new type of combined pipe fitting suitable for modular integrated building pipelines to pass through floor slabs, including a pre-buried water stop joint 1, a pre-buried sleeve 2, a connecting straight pipe 3 and a socket fixing pipe fitting 4.

[0042] The embedded water stop joint 1 is used to be arranged in the bottom plate 6 of the upper module, and has an upper socket 11, a water stop wing ring 12 and a lower socket 13. The upper socket 11, the water stop wing ring 12 and the lower socket 13 are connected in sequence from top to bottom, and the edge of the lower socket 13 extends outward to form a first extension plate 14;

[0043] The embedded sleeve 2 is used to be arranged in the top plate 7 of the lower module, and includes a sleeve body 21. A waterproof rubber ring 22 is sleeved on the outer wall surface of the upper port of the sleeve body 21. The first extension plate 14 abuts against the waterproof rubber ring 22 up and down. The edge of the lower port of the sleeve body 21 extends outward to form a second extension plate 23. A connection structure is provided on the bottom surface of the outer edge of the second extension plate 23.

[0044] The connecting straight pipe 3 includes a straight pipe section 31. The upper end of the straight pipe section 31 passes through the embedded casing 2 and is plugged into the lower socket 13 of the embedded water stop joint 1. The edge of the lower end of the straight pipe section 31 extends outward to form a third extension plate 32. The upper surface of the third extension plate 32 abuts against the bottom surface of the second extension plate 23.

[0045] The socket-fixed pipe fitting 4 includes a pipe fitting body 41. The edge of the upper port of the pipe fitting body 41 extends outward to form a fourth extension plate 42. The upper surface of the fourth extension plate 42 abuts against the bottom surface of the third extension plate 32. The outer edge of the fourth extension plate 42 is detachably connected to the connecting structure on the second extension plate 23.

[0046] Furthermore, the upper socket 11 of the embedded water-stop joint 1 is plugged into the drainage riser of the upper module, and the lower end of the socket fixing pipe 4 is plugged into the drainage riser of the lower module.

[0047] The novel composite pipe fitting of the present embodiment comprises a pre-buried water-stop joint 1, a pre-buried sleeve 2, a connecting straight pipe 3 and a socket fixing pipe fitting 4. The pre-buried water-stop joint 1 is pre-buried in the bottom plate 6 of the upper module, and the pre-buried sleeve 2 is pre-buried in the top plate 7 of the lower module. After the upper module is hoisted, the pre-buried water-stop joint 1 is located above the pre-buried sleeve 2 and squeezes the waterproof rubber ring 22 on the pre-buried sleeve 2. The waterproof rubber ring 22 is used to isolate the accumulated water in the mortar layer 9, thereby preventing the accumulated water from entering the pre-buried sleeve 2. The connecting straight pipe 3 and the socket fixing pipe fitting 4 are installed in the lower module. The connecting straight pipe 3 is used to connect the pre-buried water-stop joint 1 and the socket fixing pipe fitting 4, thereby forming a connecting passage for the upper and lower drainage risers. Through the combination of the above four components, the present embodiment saves the on-site sleeve sealing process, realizes the rapid installation of the pipeline through the floor slab composite pipe fitting, and solves the leakage problem of the accumulated water in the mortar layer and the secondary pollution problem caused by the sleeve sealing.

[0048] See also Figure 4 In this embodiment, the inner diameter and outer diameter of the upper end of the straight pipe section 31 of the connecting straight pipe 3 remain unchanged, and the inner diameter and outer diameter of the lower end of the straight pipe section 31 gradually decrease.

[0049] It should be noted that the advantage of the above structure is that the gap between the connecting straight pipe 3 and the embedded sleeve 2 can be increased to facilitate deviation adjustment. In the actual hoisting construction process, when the upper module is hoisted on the lower module, the embedded water stop 1 may not be directly above the embedded sleeve 2. At this time, due to the large gap between the connecting straight pipe 3 and the embedded sleeve 2, a horizontal deviation of ±10mm is allowed between the embedded water stop 1 and the embedded sleeve 2. Within this error range, the connecting straight pipe 3 can still pass through the embedded sleeve 2 and be plugged into the embedded water stop 1, so as to realize the normal assembly of the drainage riser connecting the upper and lower modules without causing water leakage.

[0050] Furthermore, a first annular groove is provided on the lower surface of the third epitaxial plate 32, and a sealing rubber pad 33 is provided in the first annular groove to form a sealed connection between the third epitaxial plate 32 and the fourth epitaxial plate 42. The sealing rubber pad 33 is used to seal the gap between the third epitaxial plate 32 and the fourth epitaxial plate 42.

[0051] Reference Figure 3 and Figure 5 The connection structure on the bottom surface of the second extension plate 23 of the embedded sleeve 2 of this embodiment is a spun connection groove, and a first spun fixing piece 24 is arranged on the inner wall surface of the spun connection groove. A second spun fixing piece 43 is arranged on the outer edge of the fourth extension plate 42 of the socket fixing pipe fitting 4, and the first spun fixing piece 24 is spunly connected with the second spun fixing piece 43.

[0052] When assembling the embedded sleeve 2 and the socket fixing pipe fitting 4, the second spun fixing part 43 on the fourth extension plate 42 is misaligned with the first spun fixing part 24 on the second extension plate 23, and the socket fixing pipe fitting 4 moves in the vertical direction so that the second spun fixing part 43 on the fourth extension plate 42 enters into the spun connection groove on the bottom surface of the second extension plate 23, and then the socket fixing pipe fitting 4 is rotated so that the second spun fixing part 43 coincides with the first spun fixing part 24, thereby forming a spun connection.

[0053] It should be noted that the embedded sleeve 2 and the socket fixing pipe fitting 4 of the present embodiment can also be detachably connected by means of threaded connection or snap connection.

[0054] Furthermore, a sealing rubber ring 25 is provided in the spun connection groove on the bottom surface of the second extension plate 23 , and the sealing rubber ring 25 is used to seal the gap between the second spun fixing member 43 and the first spun fixing member 24 .

[0055] In this embodiment, a second annular groove is provided on the upper surface of the fourth extension plate 42, and fireproof mud 44 is provided in the second annular groove, and the fireproof mud 44 abuts against the third extension plate 32 up and down. The fireproof mud 44 is a fireproof blocking material and is not flammable.

[0056] Furthermore, a fire-blocking ring 45 is sleeved on the outer periphery of the pipe body 41 of the socket-fixed pipe fitting 4. The fire-blocking ring 45 is a safety device for preventing the spread of fire. The fire-blocking ring 45 is made of a metal shell, filled with a flame-retardant expansion core material, sleeved on the outer wall of the pipe body 41, and fixed on the floor or wall. When a fire occurs, the core material expands rapidly due to heat, squeezes the plastic pipe, and blocks the pipe hole in a short time, preventing the fire from spreading along the hole.

[0057] In order to prevent concrete from entering the embedded sleeve 2 when pouring the cast-in-place layer 8, the upper end opening of the waterproof rubber ring 22 of this embodiment can be optionally covered with a protective cover. After the cast-in-place layer 8 is poured, the protective cover can be removed so that the embedded sleeve 2 can be connected to the embedded water stop 1 of the upper module.

[0058] The use process of the new combined pipe fittings for modular integrated building pipelines passing through floor slabs in this embodiment is as follows:

[0059] First, when the upper module is cast on the bottom plate 6, the embedded water stop 1 is embedded in the 60mm thick module concrete bottom plate 6, and the bottom surface of the first extension plate 14 of the embedded water stop 1 is flush with the bottom surface of the module bottom plate 6. The height of the sleeve body 21 of the embedded sleeve 2 is 130mm, and there is a waterproof rubber ring 22 on the top. The top of the waterproof rubber ring 22 is 20mm higher than the main sleeve body 21. A protective cover is set at the opening of the waterproof rubber ring 22 to prevent concrete from falling into the embedded sleeve 2 when the cast-in-place layer 8 is cast. The embedded sleeve 2 is embedded in the 60mm thick concrete top plate 8 of the standardized module in the factory, and the bottom of the embedded sleeve 2 is flush with the bottom surface of the top plate 7 of the lower module.

[0060] Secondly, after the finished lower module is transported to the construction site and hoisted and placed in place, a 70mm thick concrete slab is poured on the top plate 7 of the lower module. After the cast-in-place layer 8 is cast, a 20mm thick mortar layer 9 is laid on the cast-in-place layer 8. The protective cover on the waterproof rubber ring 22 is removed. The top of the waterproof rubber ring 22 is just flush with the top of the mortar layer 9, which can effectively prevent the subsequent water accumulation in the mortar layer 9 from entering the inner wall of the embedded casing 2. After that, the finished upper module is transported to the construction site and hoisted and placed on the lower module. The first extension plate 14 on the embedded water stop 1 squeezes the waterproof rubber ring 22 on the embedded casing 2.

[0061] Again, since the standard module hoisting construction allows the error to be controlled within the range of 10mm, after the upper module is hoisted and placed, the embedded water stop 1 is within the ±10mm deviation range in the horizontal direction above the embedded sleeve 2. The construction personnel extend the connecting straight pipe 3 into the embedded sleeve 2 at the top of the lower module, and connect it with the lower socket 13 in the embedded water stop 1 through a sealing ring. The straight pipe section 31 of the connecting straight pipe 3 is 181mm high, and its function is to pass through the embedded component 2 and form a flexible socket connection with the lower socket 13 of the embedded water stop 1 to form a water flow path. After the upper and lower modules are hoisted and placed on site, when preparing to connect the upper and lower risers, the construction personnel use a brush to apply lubricant on the outer surface of the upper mouth of the connecting straight pipe 3, and connect the connecting straight pipe 3 through the embedded component 2 on the top plate 7 and the embedded component 1 on the bottom plate 6 of the upper module to form a flexible socket connection, and adjust the vertical construction error of the mortar layer 9 by the flexible socket depth (30mm-50mm) with the embedded component 1. Theoretically, the thickness of the mortar layer 9 is 20 mm. The product design allows a construction error of the thickness of the mortar layer 9 of ±10 mm, that is, the allowable range of the thickness of the mortar layer is 10 mm-30 mm.

[0062] Finally, the height of the pipe body 41 of the socket-fixed pipe fitting 4 is 60 mm. After the connected straight pipe 3 is fixed, the upper port of the socket-fixed pipe fitting 4 is screwed and fixed to the lower port of the embedded sleeve 2. The inner pipe wall of the socket-fixed pipe fitting 4 is squeezed and sealed with the sealing rubber pad 33 at the bottom of the connected straight pipe 3 to prevent odor from overflowing from the drainage riser. At the same time, the lower port of the socket-fixed pipe fitting 4 is a flexible socket interface, which is used to connect the drainage riser of the lower module.

[0063] The new type of combined pipe fittings in this embodiment realizes the rapid connection of the upper and lower drainage risers of the concrete modular integrated building modules, and due to the structural characteristics of the pre-buried water stop joint 1, the pre-buried casing 2, the connecting straight pipe 3 and the socket fixing pipe fitting 4, it can adjust the hoisting construction error, and at the same time solves the problem of water seepage through the inner wall of the casing in the mortar layer during the construction of modular integrated buildings, avoids the secondary blocking of the gap between the pipeline and the inner wall of the casing on site, and effectively improves the construction efficiency.

[0064] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0067] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0068] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A new type of combined pipe fitting suitable for pipelines passing through floors in modular integrated buildings, characterized by: include: The embedded water stop joint (1) is used to be arranged in the bottom plate (6) of the upper module, and its lower socket (13) forms a first extension plate (14); The embedded sleeve (2) is used to be arranged in the top plate (7) of the lower module, and comprises a sleeve body (21), the upper end of the sleeve body (21) is sleeved with a waterproof rubber ring (22), the first extension plate (14) abuts against the waterproof rubber ring (22) up and down, the lower end of the sleeve body (21) forms a second extension plate (23), and a connection structure is arranged on the bottom surface of the outer edge of the second extension plate (23); A connecting straight pipe (3) comprises a straight pipe section (31), the upper end of the straight pipe section (31) passes through the embedded sleeve (2) and is plugged into the lower socket (13), and the lower end of the straight pipe section (31) forms a third extension plate (32); The socket-fixed pipe fitting (4) comprises a pipe fitting body (41), an upper end of the pipe fitting body (41) forming a fourth extension plate (42), a second extension plate (23), a third extension plate (32), and a fourth extension plate (42) being abutted against each other in sequence, and an outer edge of the fourth extension plate (42) being detachably connected to a connection structure on the second extension plate (23).

2. The novel combined pipe fitting according to claim 1, characterized in that: The inner diameter and outer diameter of the upper end of the straight pipe section (31) remain unchanged, and the inner diameter and outer diameter of the lower end of the straight pipe section (31) gradually decrease.

3. The novel combined pipe fitting according to claim 1 is characterized in that: A first annular groove is provided on the lower surface of the third epitaxial plate (32), and a sealing rubber pad (33) is provided in the first annular groove to form a sealed connection between the third epitaxial plate (32) and the fourth epitaxial plate (42).

4. The novel combined pipe fitting according to claim 1 is characterized in that: The connection structure on the bottom surface of the second epitaxial plate (23) is a spun connection groove, a first spun fixing piece (24) is arranged on the inner wall surface of the spun connection groove, a second spun fixing piece (43) is arranged on the outer edge of the fourth epitaxial plate (42), and the first spun fixing piece (24) is spun-connected to the second spun fixing piece (43).

5. The novel combined pipe fitting according to claim 4 is characterized in that: A sealing rubber ring (25) is arranged in the spinning connection groove on the bottom surface of the second extension plate (23) to seal the gap between the second spinning fixing piece (43) and the first spinning fixing piece (24).

6. The novel combined pipe fitting according to claim 1, characterized in that: A second annular groove is provided on the upper surface of the fourth extension plate (42), fireproof mud (44) is provided in the second annular groove, and the fireproof mud (44) abuts against the third extension plate (32) from top to bottom; The outer periphery of the pipe body (41) is covered with a fire-blocking ring (45).

7. The novel combined pipe fitting according to claim 1 is characterized in that: The upper opening of the waterproof rubber ring (22) can be optionally covered with a protective cover.

8. The novel combined pipe fitting according to any one of claims 1 to 7, characterized in that: The embedded water stop joint (1) also has an upper receiving opening (11) and a water stop wing ring (12), and the upper receiving opening (11), the water stop wing ring (12) and the lower receiving opening (13) are connected in sequence from top to bottom; The upper socket (11) of the embedded water stop joint (1) is plugged into the drainage riser of the upper module, and the lower port of the socket fixing pipe (4) is plugged into the drainage riser of the lower module.

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