Connection device

Abstract

The utility model provides a connection device. The connection device comprises a barrel, a spigot part and a socket part, wherein the spigot part is arranged at the first end of the barrel and used for being connected with a non-metal pipe, and the socket part is arranged at the second end of the barrel and used for being connected with a metal pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of water supply pipe conversion joints, in particular to a connecting device. Background Art

[0002] The connections between cities across the country are increasing, and transportation links are also constantly strengthening. Due to the construction of expressways, the water supply pipes in their original locations need to be occupied, so the water supply pipes need to be relocated.

[0003] Currently, water supply pipes are commonly made of PCCP, or prestressed concrete cylinder pipe. PCCP is a new type of composite pipe made from four basic raw materials: steel plate, prestressed steel wire, concrete, and cement mortar. After undergoing a series of manufacturing processes, including steel cylinder forming, concrete pouring, application of prestressing control technology, and protective layer spraying, PCCP is widely used worldwide for large-scale water transmission projects between regional water sources, water supply and distribution networks for tap water, industrial and agricultural irrigation systems, power plant circulating water pipelines, various municipal pressure sewage mains, and inverted siphons.

[0004] However, PCCP pipe has several drawbacks, including the heavy weight of individual sections, the high requirements for lifting equipment during installation, the required working surface width compared to steel pipe, and its greater environmental impact. Therefore, when renovating or relocating PCCP water supply pipes in the water supply pipeline relocation project for the occupied section of the Foshan First Ring Road North Line of the Guangzhou-Foshan-Zhaoqing Expressway, the renovated section is typically converted to steel pipe. A common method for connecting PCCP and steel pipes is to add inspection wells at the transition point. These wells are typically constructed using brickwork or cast-in-place concrete.

[0005] Therefore, in order to solve the problem of adding an inspection well when connecting PCCP pipes and steel pipes, the art hopes to provide a connecting device to achieve the mutual connection between PCCP pipes and steel pipes. Utility Model Content

[0006] The purpose of the utility model is to provide a connecting device, which can be installed between the PCCP pipe and the steel pipe, thereby realizing the transition between the metal pipe and the non-metallic pipe, and further improving the overall quality of the water supply pipe after the transformation.

[0007] According to the utility model, a connecting device is provided, comprising a cylinder,

[0008] a socket portion provided at the first end of the cylinder and used for connecting with a non-metallic pipe, and

[0009] A socket portion is provided at the second end of the cylinder and is used for connecting with the metal pipe.

[0010] In one embodiment, the non-metallic pipe is a prestressed steel cylinder concrete pipe.

[0011] In one embodiment, a limiting plate configured as an annular structure is provided between the cylinder and the socket portion for limiting the movement path of the non-metallic tube.

[0012] In one embodiment, the socket portion includes a positioning cylinder fixed laterally on the limiting plate and used to form a sealed connection with the non-metallic tube, and at least two through grooves accommodating sealing rings arranged at intervals on the outer wall of the positioning cylinder.

[0013] In one embodiment, a pressure test hole for detecting the sealing performance between the positioning cylinder and the non-metallic tube is provided on the positioning cylinder, and the pressure test hole is located between the two through grooves.

[0014] In one embodiment, the metal pipe is a steel pipe.

[0015] In one embodiment, a steel ring is provided between the cylinder and the socket portion, and reinforcing plates are provided between the cylinder, the steel ring and the limiting plate.

[0016] In one embodiment, a plurality of reinforcing plates are provided along the circumference of the cylinder at equal intervals.

[0017] In one embodiment, the socket portion includes a socket plate fixed on a steel ring in a transverse direction, and the metal tube is welded to a free end of the socket plate.

[0018] In one embodiment, a coating is provided on both the positioning cylinder and the socket plate.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] First, the present invention can be installed between PCCP pipes and steel pipes, thus achieving a transition between metal and non-metallic pipes, further improving the overall quality of the water supply pipe renovation. Furthermore, compared to existing test wells constructed with brickwork and cast-in-place concrete, the present invention not only effectively shortens the overall construction and installation cycle, but also ensures excellent stability and firmness between the water supply pipes (i.e., the PCCP pipes and the steel pipes) after installation.

[0021] Secondly, this invention incorporates a sealing ring in the through-groove of the positioning tube, enabling a sealed connection between the PCCP tube and the positioning tube via the sealing ring, further enhancing the seal between the PCCP tube and the socket. Furthermore, a pressure test hole is provided on the positioning tube to facilitate subsequent hydraulic testing of the joint, further ensuring the stability, robustness, and sealing of the overall structure of the modified water supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described in detail below with reference to the accompanying drawings, in which:

[0023] Figure 1 The structure of the docking device according to the present invention is schematically shown;

[0024] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0025] Figure 3 for Figure 1 A partial enlarged view of point B in the middle.

[0026] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0027] To make the technical solutions and advantages of the present invention more clearly understood, exemplary embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, and are not exhaustive. Furthermore, the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict.

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 The structure of the docking device 100 according to the present invention is schematically shown.

[0030] like Figure 1 As shown, the connection device 100 according to the present invention mainly includes a barrel 10, a spigot, and a bell. The spigot is located at the first end of the barrel 10 and is capable of connecting to a non-metallic pipe (not shown), while the bell is located at the second end of the barrel 10 and is capable of connecting to a metal pipe (not shown). Thus, the connection device 100 can achieve a transitional connection between a non-metallic pipe and a metal pipe, further improving the efficiency and quality of water supply pipe reconstruction.

[0031] In this utility model, the non-metallic pipe is a PCCP pipe. Prestressed Concrete Cylinder Pipe (PCCP) is a new type of composite pipe made from four basic raw materials: steel plate, prestressed steel wire, concrete, and cement mortar. It undergoes a series of manufacturing processes, including steel cylinder forming, concrete pouring, application of prestressing control technology, and protective layer spraying.

[0032] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0033] In one embodiment, Figure 1 and 2 As shown, a limiting plate 11 is provided between the cylinder 10 and the socket portion. Preferably, the limiting plate 11 is configured as an annular structure, and the socket portion includes a positioning cylinder 21 fixed on the limiting plate 11 in the transverse direction.

[0034] In the present invention, when the PCCP pipe is hoisted onto the positioning cylinder 21, the movement path of the PCCP pipe can be effectively limited by the limit plate 11. In other words, when the PCCP pipe is axially abutted against the limit plate 11, the PCCP pipe will have a maximum crawling distance on the positioning cylinder 21. At this time, there will be a firm connection between the PCCP pipe and the positioning cylinder 21, further improving the stability and firmness of the overall structure after the water supply pipe is modified.

[0035] In one embodiment, Figure 1 and 2 As shown, the socket portion includes a through-slot 22 provided on the outer wall of the positioning tube 21. In the present invention, at least two through-slots 22 are provided, spaced apart on the positioning tube 21. Preferably, each through-slot 22 is filled with a sealing ring (not shown). Therefore, when the PCCP pipe is installed on the positioning tube 21, the sealing ring forms a sealed connection between the PCCP pipe and the positioning tube 21, further improving the sealing between the PCCP pipe and the socket portion.

[0036] In one embodiment, Figure 2 As shown, a pressure test hole 23 is provided on the positioning tube 21 for testing the sealing between the positioning tube 21 and the PCCP pipe. Preferably, the pressure test hole 23 is located between the two through grooves 22. Therefore, after the connecting device 100 is installed with the PCCP pipe and the metal pipe, a joint water pressure test can be performed.

[0037] In the present invention, the joint water pressure test is usually performed by using a manual pressure pump to inject water on one side (such as the PCCP pipe) and exhaust on the other side (such as the metal pipe), and tightening the bolts after water is sprayed out at the end of exhaust.

[0038] Preferably, joint pressure testing is performed in two stages. In the first stage, the pressure is raised to 0.2 MPa to inspect the connection assembly 100. A leak-free connection is considered acceptable. In the second stage, the pressure is increased to the test pressure and maintained for 5 minutes without a drop in pressure. Otherwise, the connection assembly must be removed and reinstalled until it passes the test. This method effectively tests the seal between the PCCP pipe and the positioning cylinder 21, further improving the overall quality of the modified water supply pipe.

[0039] In this utility model, if Figure 1 and 2As shown, a reinforcement plate 13 is provided between the stop plate 11 and the cylinder 10. Preferably, multiple reinforcement plates 13 are arranged equidistantly along the circumference of the cylinder 10. This significantly enhances the overall rigidity of the cylinder 10. Therefore, during the connection between the PCCP pipe and the connection device 100, the reinforcement plates 13 prevent the cylinder 10 from deforming or becoming out of round, thereby increasing the success rate of connection between the positioning cylinder 21 and the PCCP pipe and further improving the overall quality of the modified water supply pipe.

[0040] In the present invention, the metal pipe is a steel pipe (not shown), so the socket part of the connecting device 100 can be directly connected to the steel pipe, thereby significantly shortening the working time and further improving the effect of the water supply pipe modification, which is described in detail below.

[0041] Figure 3 for Figure 1 A partial enlarged view of point B in the middle.

[0042] In one embodiment, Figure 1 and 3 As shown, a steel ring 12 is provided between the cylinder 10 and the socket portion, and the socket portion includes a socket plate 31 fixed transversely to the steel ring 12. Preferably, the socket plate 31 is constructed in the form of a hollow sleeve, and the free end surface of the socket plate 31 is flat, so that it is easier to achieve a fixed connection with the steel pipe by welding, further improving the firmness between the connecting device 100 and the steel pipe.

[0043] Preferably, to ensure welding quality, the fillet weld should be inspected for flaws after welding is completed.

[0044] In this utility model, if Figure 1 and 3 As shown, a reinforcement plate 13 is provided between the steel ring 12 and the cylinder 10. Preferably, multiple reinforcement plates 13 are arranged equidistantly along the circumference of the cylinder 10. This significantly enhances the overall rigidity of the cylinder 10. Therefore, during the docking process between the steel pipe and the docking device 100, the reinforcement plates 13 prevent the cylinder 10 from deforming or becoming out of round, thereby increasing the docking success rate between the socket plate 31 and the steel pipe and further improving the overall quality of the modified water supply pipe.

[0045] In the present invention, a coating is provided on both the positioning cylinder 21 and the socket plate 31. Preferably, the coating is made of drinking water tank paint, and the cylinder body 10 as a whole is provided with anti-corrosion measures.

[0046] In the present invention, the inner wall of the positioning tube 21 and the outer wall of the socket plate 31 are both covered with M30 mortar.

[0047] The utility model provides the following anti-corrosion measures for steel pipes: First, steel pipes must be derusted before anti-corrosion treatment, and the quality level of the rust removal should reach Sa2.5 by sandblasting, and the quality level of manual rust removal should reach St3.0. The dust and sand on the surface should be cleaned to make the surface clean and dry. Second, the external anti-corrosion of steel pipes adopts epoxy coal tar extra-reinforced fat corrosion (seven oils and two cloths), that is, primer, topcoat, one coat, glass cloth, one coat, one coat, one coat, and glass cloth, with a dry film thickness greater than or equal to 0.6mm. The glass cloth adopts medium-alkali, untwisted, wax-free glass fiber cloth with a warp and weft density of 12x12 strands / cm2. The pipe end is reserved with a length of 150mm without anti-corrosion treatment. Polyvinyl chloride tape (patching tape) is used at the ground pipeline interface. The method is to apply one layer of primer, one layer of inner tape, and one layer of outer tape with a thickness of >1.2mm. The overlap length of the tape and the epoxy castellated asphalt anti-corrosion layer is 150mm. Thirdly, the internal corrosion protection of the steel pipe adopts internal drinking water epoxy paint, and the anti-corrosion grade is extra reinforced. The method is two bottoms and four sides, and the coating thickness is >300um.

[0048] Compared with the prior art, the advantages of the present invention are:

[0049] First, the present invention can be installed between PCCP pipes and steel pipes, thus achieving a transition between metal and non-metallic pipes, further improving the overall quality of the water supply pipe renovation. Furthermore, compared to existing test wells constructed with brickwork and cast-in-place concrete, the present invention not only effectively shortens the overall construction and installation cycle, but also ensures excellent stability and firmness between the water supply pipes (i.e., the PCCP pipes and the steel pipes) after installation.

[0050] Secondly, the present invention incorporates a sealing ring on the through-slot 22 of the positioning tube 21, enabling a sealed connection between the PCCP pipe and the positioning tube 21 via the sealing ring, further enhancing the seal between the PCCP pipe and the socket. Furthermore, the present invention incorporates a pressure test hole 23 on the positioning tube 21 to facilitate subsequent hydraulic testing of the joint, further ensuring the stability, robustness, and sealing of the overall structure of the modified water supply pipe.

[0051] 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 technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0052] In the present invention, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", and "fixed" 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, and it can be the internal connection of two components.

[0053] For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0054] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art may easily make changes or modifications within the scope disclosed herein, and such changes or modifications shall be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A docking device, characterized in that: include: Cylinder (10), a socket portion provided at the first end of the cylinder (10) and used for connecting to a non-metallic pipe, and A socket portion is provided at the second end of the cylinder (10) and is used to connect to a metal pipe. A limiting plate (11) having an annular structure and used to limit the movement path of the non-metallic pipe is provided between the cylinder (10) and the socket portion.

2. The docking device according to claim 1, characterized in that: The non-metallic pipe is a prestressed steel cylinder concrete pipe.

3. The docking device according to claim 2, characterized in that: The socket portion comprises a positioning cylinder (21) fixed laterally on the limiting plate (11) and used to form a sealed connection with the non-metallic tube, and at least two through grooves (22) containing sealing rings arranged at intervals on the outer wall of the positioning cylinder (21).

4. The connection device according to claim 3, characterized in that: A pressure test hole (23) for detecting the sealing performance between the positioning cylinder (21) and the non-metallic tube is provided on the positioning cylinder (21), and the pressure test hole (23) is located between the two through grooves (22).

5. The connection device according to claim 4, characterized in that: The metal pipe is a steel pipe.

6. The connection device according to claim 5, characterized in that: A steel ring (12) is provided between the cylinder (10) and the socket portion, and a reinforcing plate (13) is provided between the cylinder (10), the steel ring (12) and the limiting plate (11).

7. The docking device according to claim 6, characterized in that: A plurality of reinforcing plates (13) are arranged at equal intervals along the circumference of the cylinder (10).

8. The docking device according to claim 7, characterized in that: The socket portion comprises a socket plate (31) fixed on a steel ring (12) in the transverse direction, and the metal pipe is welded to the free end of the socket plate (31).

9. The docking device according to claim 8, characterized in that: Coatings are provided on both the positioning cylinder (21) and the socket plate (31).

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