Socket and spigot type flexible connector connecting pipe fitting for jacking construction method

Abstract

The utility model provides a socket and spigot type flexible connector connecting pipe fitting for a jacking construction method. The socket and spigot type flexible connector connecting pipe fitting comprises a steel pipe, the spigot steel ring and the socket steel ring are arranged at the two ends of the steel pipe respectively; the socket steel ring comprises a socket sealing groove ring and a socket welding ring; the socket sealing groove ring is arranged at one end of the socket sealing groove ring; a socket steel ring pushing surface is arranged on the socket welding ring; when any two groups of steel pipes are connected in series, the socket sealing groove ring in the socket steel ring on one group of steel pipes is inserted into the socket steel ring on the other group of steel pipes; the bell mouth steel ring abuts against the pushing face of the spigot steel ring. And a rubber sealing ring group with a sealing function is arranged on the outer wall of the socket sealing groove ring. The socket and spigot type flexible connector connection mode replaces a traditional plain end type rigid welding connection mode, the assembling efficiency of pipe fittings is improved, the situation that jacking thrust is greatly increased due to long-time stagnation is avoided, and the site construction difficulty is lowered.

Description

Technical Field

[0001] The utility model belongs to the technical field of jacking construction, and particularly relates to a socket-and-spigot flexible joint connecting pipe fitting for the jacking construction method. Background Art

[0002] For the trenchless construction techniques and methods of underground pipelines, the jacking construction is widely used in underground pipeline projects because it can minimize the impact of the project on the surrounding environment and traffic to the greatest extent, reduce the input of construction labor at the same time, is not affected by climate and environment, can improve construction efficiency, reduce the comprehensive construction cost, and achieve time-saving, high-efficiency and safety.

[0003] As a high-strength and lightweight high-quality water supply and drainage pipeline material, steel pipes are also being used in jacking construction. In the jacking construction project of steel pipes, usually, after the end faces of the fixed-length anti-corrosion pipes are processed with welding bevels one by one, the steel pipes are welded one by one, and then jacked one by one. Such construction has the following problems: the welding time of the pipes is long, and the waiting time for jacking is long, resulting in a long pause time for the jacking construction. Due to the long-term adsorption and wrapping effect between the soil outside the steel pipe and the outer wall of the steel pipe, the external friction resistance of the pipe increases. The long-term stagnation leads to a large increase in the jacking thrust after each welding of the steel pipe, further increasing the construction difficulty. Summary of the Utility Model

[0004] The utility model provides a socket-and-spigot flexible joint connecting pipe fitting for the jacking construction method, aiming to solve the problems that the long welding time of the current pipes not only results in insufficient construction efficiency, but also the long-term stagnation leads to an increase in the external friction resistance of the pipe and a large increase in the jacking thrust, causing great construction difficulty.

[0005] The utility model is realized as follows. A socket-and-spigot flexible joint connecting pipe fitting for the jacking construction method includes:

[0006] A steel pipe;

[0007] A socket steel ring and a spigot steel ring, which are respectively connected to both ends of the steel pipe;

[0008] The socket steel ring includes a socket sealing groove ring and a socket welding ring distributed in a stepped manner. The outer diameter of the socket welding ring is larger than that of the socket sealing groove ring. The cross-sectional part of the socket welding ring exceeding the socket sealing groove ring forms a socket steel ring jacking surface at the connection between the socket sealing groove ring and the socket welding ring;

[0009] When any two groups of steel pipes are connected in series, the socket sealing groove ring on one group of the steel pipes is inserted into the spigot steel ring on the other group of the steel pipes; when the socket sealing groove ring is inserted into the interior of the spigot steel ring, the end face of the spigot steel ring away from the steel pipe abuts against the socket steel ring jacking surface.

[0010] Preferably, a rubber sealing ring group is provided on the outer wall of the socket sealing groove ring. The rubber sealing ring group is used for sealing the connection between the socket steel ring and the spigot steel ring. The rubber sealing ring group includes not less than two rubber sealing rings.

[0011] Preferably, the outer wall of the socket sealing groove ring is provided with sealing ring grooves equal in number to the rubber sealing rings.

[0012] Preferably, a nested ring groove is provided at one end of the socket welding ring away from the socket sealing groove ring, and the steel pipe is inserted into the nested ring groove.

[0013] Preferably, a socket weld is provided between the steel pipe and the nested ring groove. The socket weld includes an outer weld located between the outer wall of the steel pipe and the socket welding ring and an inner weld located between the front end of the steel pipe and the nested ring groove.

[0014] Preferably, the spigot steel ring is welded to the steel pipe.

[0015] Preferably, after the socket sealing groove ring is inserted into the spigot steel ring, an annular spacing gap is provided between the socket sealing groove ring and the spigot steel ring, and an inner interface sealing mortar layer is filled in the spacing gap.

[0016] Preferably, a mortar protection layer is provided on the inner wall of the steel pipe.

[0017] Preferably, after being filled, the inner interface sealing mortar layer is flush with the mortar protection layer inside the pipe.

[0018] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

[0019] 1. The socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method provided by the present utility model replaces the traditional flat mouth rigid welding connection method by using the socket and spigot flexible joint connection method, making the pipe connection method fast and convenient due to the insertion connection, improving the assembly efficiency of the pipe fitting, avoiding a large increase in the pipe jacking thrust caused by long-term stagnation by reducing the on-site welding operation time, and greatly reducing the on-site construction difficulty.

[0020] 2. The socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method provided by the present utility model realizes the production of the anti-corrosion project on the outer wall of the pipe and the cement mortar protection layer on the inner wall of the pipe through the factory prefabrication method, which not only ensures the production quality but also avoids environmental pollution caused by on-site production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method provided by the present utility model.

[0022] Figure 2 It is a partial enlarged schematic view of the structure at location A of a socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method provided by the present utility model.

[0023] Figure 3 It is a partial enlarged schematic view of the structure at location B of a socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method provided by the present utility model.

[0024] Figure 4 It is a schematic view of the structure of the socket steel ring of a socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method provided by the present utility model.

[0025] Figure 5 It is a schematic view of the structure of the spigot steel ring of a socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method provided by the present utility model.

[0026] Explanation of reference numerals:

[0027] 1. A section of steel pipe; 2. A second section of steel pipe; 31. Socket steel ring; 311. Sealing groove; 312. Nested ring groove; 32. Spigot steel ring; 41. Mortar protective layer inside the pipe; 42. Inner interface plugging mortar layer; 43. Inner plugging mortar for plugging; 51. Socket weld; 52. Spigot weld; 6. Rubber sealing ring group; 7. Grouting port. Detailed implementation manners

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0029] Referring to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0030] An embodiment of the present utility model provides a socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method, as Figures 1-5 shown, the socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method includes:

[0031] A first section of steel pipe 1 and a second section of steel pipe 2;

[0032] The spigot steel ring 31 and the socket steel ring 32 are provided at both ends of the first section steel pipe 1 and the second section steel pipe 2. The first section steel pipe 1 and the second section steel pipe 2 have the same structure. The structure of the first section steel pipe 1 and the second section steel pipe 2 can adopt a variety of structural types such as straight pipes and curved pipes as needed. During the construction process, multiple groups of steel pipes are connected in series as needed to achieve the purpose of jacking construction. This embodiment is explained with the socket steel ring 32 on the first section steel pipe 1 and the spigot steel ring 31 on the second section steel pipe 2;

[0033] The spigot steel ring 31 includes a spigot sealing groove ring and a spigot welding ring; the spigot sealing groove ring is the part of the spigot steel ring 31 inserted into the socket steel ring 32, and two groups of sealing grooves 311 are arranged on the ring side of the spigot sealing groove ring; a rubber sealing ring group 6 composed of two rubber sealing rings is assembled in the sealing groove 311, and the depth of the part of the spigot sealing groove ring inserted into the socket steel ring 32 is not less than 100 mm;

[0034] One end of the spigot welding ring is connected to the spigot sealing groove ring, the outer diameter of the spigot welding ring is larger than the outer diameter of the spigot sealing groove ring, and the cross-sectional portion of the spigot welding ring that exceeds the spigot sealing groove ring is the spigot steel ring push surface; the end face of the socket steel ring 32 away from a section of the steel pipe 1 is pressed against the spigot steel ring push surface on the spigot welding ring;

[0035] The end of the spigot welding ring away from the spigot sealing groove ring is provided with a nested ring groove 312, which is recessed inwards and accommodates the insertion of the second section of steel pipe 2; the end surface of the second section of steel pipe 2 will abut against the nested ring groove 312, and the axial thrust generated on the second section of steel pipe 2 during the jacking process will act on the spigot welding ring, and the axial thrust of the spigot welding ring will eventually act on the socket steel ring 32;

[0036] During the jacking construction method, a jacking thrust is applied from the second section steel pipe 2 to one side of the first section steel pipe 1, and the socket steel ring 32 supports the spigot steel ring 31. The spigot steel ring 31 bears and transmits the axial jacking thrust of the jacking construction during the jacking process, thereby realizing the axial advancement of the socket-and-spigot steel jacking pipe;

[0037] The rubber sealing ring group 6 is an important component of the flexible sealing of the socket-type steel jacking pipe; the rubber sealing ring group 6 is composed of two rubber sealing rings, which cooperate with the two groups of sealing grooves 311 provided on the socket steel ring 31 to construct a flexible sealing structure at the socket connection, so that the sealing performance of the interface of the pipeline, the ability to resist the interference of uneven settlement, and the seismic resistance are further improved;

[0038] As a preferred implementation mode in this embodiment, the socket steel ring 32 is welded to a section of steel pipe 1, and a socket weld 52 is provided between the socket steel ring 32 and a section of steel pipe 1; the socket steel ring 32 and a section of steel pipe 1 are connected by welding;

[0039] The second section of steel pipe 2 and the nested ring groove 312 are connected by welding. An insertion weld 51 is provided between the second section of steel pipe 2 and the nested ring groove 312. The insertion weld 51 includes an outer weld located between the outer wall of the second section of steel pipe 2 and the insertion welding ring and an inner weld located between the front end of the second section of steel pipe 2 and the nested ring groove 312;

[0040] As a preferred implementation mode in this embodiment, a mortar protective layer 41 is provided on the inner walls of both the first section of steel pipe 1 and the second section of steel pipe 2; the outer walls of the first section of steel pipe 1 and the second section of steel pipe 2 are both anti-corrosively coated with epoxy coal tar pitch;

[0041] After the socket sealing groove ring is inserted into the socket steel ring 32, there is an annular gap between it and the first section of steel pipe 1, and an inner interface sealing mortar layer 42 is filled in the gap; the connection of the mortar protective layer 41 inside the pipe between the first section of steel pipe 1 and the second section of steel pipe 2 is completed through the inner interface sealing mortar 42, and a protective layer is formed inside the pipe through the concrete mortar layer to passivate the inner walls of the connecting pipe fittings;

[0042] The mortar protective layer 41 inside the pipe is a high-strength and high anti-seepage cement mortar protective layer with a thickness of not less than 15 mm, uniform, smooth and clean, so as to improve the anti-corrosion ability and roughness of the socket steel pipe wall, realize the passivation of the inner wall, resist the generation of scale nodules inside the pipe, reduce the frictional resistance along the pipeline, and is beneficial to extending the safe operation life of the pipeline. The mortar protective layer 41 inside the pipe can be cast before leaving the factory;

[0043] After the socket steel ring 31 and the socket steel ring 32 are butted, through the injection of concrete mortar, the gap is filled with concrete mortar to form an inner interface sealing mortar layer 42;

[0044] The grouting port 7 is a precast sunken hole reserved on the cement mortar protective layer inside the pipe wall, and a G1 internal thread and a hexagonal plug in the prior art are used to construct the grouting port, so that during the pipe jacking process, anti-friction slurry can be injected from inside the pipe to outside the pipe through the grouting port to reduce the friction during the jacking process. After the pipeline is laid out, slurry is injected at the grouting port 7 to form an inner plugging mortar 43 to complete the plugging of the grouting port 7;

[0045] It should be noted that, for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present utility model is not limited by the described action sequence, because according to the present utility model, some steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present utility model.

[0046] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without creative efforts, combine, add, delete or make other adjustments to the features in the embodiments of the present utility model according to the circumstances, so as to obtain different technical solutions that essentially do not deviate from the concept of the present utility model, and these technical solutions also belong to the scope of protection of the present utility model.

Claims

1. A socket-type flexible joint connecting pipe fitting for pipe jacking construction method, characterized in that, Comprising: Steel pipe; Socket steel ring (31) and spigot steel ring (32), the socket steel ring (31) and the spigot steel ring (32) are respectively connected to both ends of the steel pipe; The socket steel ring (31) includes a socket sealing groove ring and a socket welding ring distributed in a stepped manner. The outer diameter of the socket welding ring is greater than the outer diameter of the socket sealing groove ring. The cross-sectional part of the socket welding ring exceeding the socket sealing groove ring forms a socket steel ring pushing surface at the connection between the socket sealing groove ring and the socket welding ring; When any two groups of steel pipes are connected in series, the socket sealing groove ring on one group of the steel pipes is inserted into the spigot steel ring (32) on the other group of the steel pipes; when the socket sealing groove ring is inserted into the interior of the spigot steel ring (32), the end face of the spigot steel ring (32) away from the steel pipe abuts against the socket steel ring pushing surface.

2. The socket-type flexible joint connecting pipe fitting for the pipe jacking construction method according to claim 1, characterized in that, A rubber sealing ring group (6) is provided on the outer wall of the socket sealing groove ring. The rubber sealing ring group (6) is used for sealing the connection between the socket steel ring (31) and the spigot steel ring (32).

3. The socket-and-spigot flexible joint connecting pipe fitting for pipe jacking construction method according to claim 2, characterized in that, The rubber sealing ring group (6) includes not less than two rubber sealing rings.

4. The socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method according to claim 3, characterized in that, Sealing grooves (311) equal in number to the rubber sealing rings are provided on the outer wall of the socket sealing groove ring, and the rubber sealing rings are assembled in the sealing grooves (311).

5. The socket-and-spigot flexible joint connecting pipe fitting for pipe jacking construction method according to claim 4, characterized in that, A nested ring groove (312) is provided at one end of the socket welding ring away from the socket sealing groove ring, and the steel pipe is inserted into the nested ring groove (312).

6. The socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method according to claim 5, characterized in that, A socket weld (51) is provided between the steel pipe and the nested ring groove (312). The socket weld (51) includes an outer weld located between the outer wall of the steel pipe and the socket welding ring and an inner weld located between the front end of the steel pipe and the nested ring groove.

7. The socket-and-spigot flexible joint connecting pipe fitting for pipe jacking construction method according to claim 6, characterized in that, The spigot steel ring (32) is welded to the steel pipe.

8. The socket-and-spigot flexible joint connecting pipe fitting for pipe jacking construction method according to claim 7, characterized in that, A ring-shaped gap is provided between the socket sealing groove ring and the spigot steel ring (32) after the socket sealing groove ring is inserted into the spigot steel ring (32), and an inner interface plugging mortar layer (42) is filled in the gap.

9. The socket-and-spigot flexible joint connecting pipe fitting for pipe jacking construction method according to claim 8, wherein, A mortar protection layer (41) inside the pipe is provided on the inner wall of the steel pipe.

10. The socket and spigot flexible joint connecting pipe fitting for pipe jacking construction method according to claim 9, characterized in that, After being filled, the inner interface plugging mortar layer (42) is flush with the mortar protection layer (41) inside the pipe.

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