Prestressed concrete steel pipe

Abstract

The utility model relates to a prestressed concrete steel pipe which is applied to the technical field of water diversion and water delivery pipelines and comprises a steel pipe body, a grouting layer and a concrete lining, and the grouting layer is arranged between the steel pipe body and the concrete lining. The annular concrete lining is poured in the steel pipe, after the concrete lining reaches certain strength, a grouting material is injected between the inner wall of the steel pipe and the outer wall of the concrete lining through a grouting hole by using a high-pressure grouting pump to form a grouting layer, the inner diameter of the steel pipe is forced to be increased, and the steel pipe is separated from the concrete lining; the concrete steel pipe has the advantages of being high in cost performance, high in internal water pressure resistance and external load resistance and excellent in internal and external corrosion resistance.

Description

Technical Field

[0001] The present application relates to the technical field of water diversion and water delivery pipelines, and in particular to a prestressed concrete steel pipe. Background Art

[0002] At present, the large-diameter water pipes commonly used in the water supply field mainly include ductile iron pipes, steel pipes, and prestressed steel cylinder concrete pipes. Among them, although the ductile iron pipe has strong resistance to internal water pressure, its corrosion resistance is general, its rigidity is low, and it is produced by the molten iron melting centrifugal process, which consumes a lot of energy. The quality of large-diameter ductile iron pipes is highly discrete, the performance is unstable, and the price is expensive; the steel pipe has high tensile strength and excellent resistance to internal water pressure, but the internal anti-corrosion process is difficult, and the rigidity is insufficient, and the resistance to external load is poor; the prestressed steel cylinder concrete pipe is a rigid pipe, which is composed of a core concrete, a thin-walled steel cylinder, a prestressed steel wire, and a mortar protective layer. It has strong resistance to internal water pressure and external load, and is cost-effective. Its disadvantage is that the protective effect of the prestressed steel wire is easily interfered by various external factors. The prestressed steel wire is continuously wound. When it lacks effective protection in a strong corrosive environment, the steel wire will rust and break after long-term use. When the number of rusted and broken steel wires reaches a certain number, the pipe will burst, causing property losses and safety accidents.

[0003] In view of this, there is an urgent need for a prestressed concrete steel pipe and a processing method thereof which has high cost performance, strong resistance to internal water pressure and external load, and excellent internal and external corrosion resistance, in order to solve the above problems. Summary of the invention

[0004] In order to help solve the problems existing in the prior art, the present application provides a prestressed concrete steel pipe, which adopts the following technical solution: comprising: a steel pipe, a grouting layer and a concrete lining, wherein the grouting layer is arranged between the steel pipe and the concrete lining.

[0005] A further feature is that

[0006] The steel pipe is provided with sealing components for sealing the two ends of the grouting layer.

[0007] The sealing assembly includes a first socket ring assembly and a first spigot ring assembly;

[0008] The first bell ring assembly comprises a first bell ring arranged at one end of the steel pipe and a first sealing tube arranged inside the first bell ring;

[0009] The first socket ring assembly includes a first socket ring and a second sealing tube. The first socket ring includes a first mounting ring, a first connecting ring and a first plug-in ring adapted to the first socket ring. Both ends of the first connecting ring are respectively connected to the first mounting ring and the first plug-in ring. One end of the first mounting ring extends to the inner side of the steel pipe and fits with the inner side of the steel pipe. One end of the second sealing tube is connected to the inner side of the first plug-in ring. A gap is left between one end of the second sealing tube close to the steel pipe and the first socket ring.

[0010] One end of the first socket ring extends to the inner side of the steel pipe and fits with the inner side of the steel pipe, and one end of the first sealing tube extends to the inner side of the steel pipe.

[0011] One end of the first socket ring is connected to the end of the steel pipe, and one end of the first sealing tube extends to the inner side of the steel pipe.

[0012] One end of the first socket ring extends to the inner side of the steel pipe and fits with the inner side of the steel pipe, one end of the first sealing tube extends to the inner side of the steel pipe, the diameter of the first sealing tube close to the second sealing tube is smaller than the diameter of the end away from the second sealing tube, and the diameter of the second sealing tube close to the first sealing tube is smaller than the diameter of the end away from the first sealing tube.

[0013] One end of the first socket ring is connected to the end of the steel pipe, one end of the first sealing tube extends to the inner side of the steel pipe, the diameter of the first sealing tube close to the end of the second sealing tube is smaller than the diameter of the end away from the second sealing tube, and the diameter of the second sealing tube close to the end of the first sealing tube is smaller than the diameter of the end away from the first sealing tube.

[0014] A first sealing rubber ring is arranged between the first socket ring and the first sealing tube, and a second sealing rubber ring is arranged between the first socket ring and the second sealing tube.

[0015] One end of the first socket ring is connected to the end of the steel pipe. The first sealing tube is ring-shaped and is arranged inside the first socket ring.

[0016] One end of the first socket ring extends to the inner side of the steel pipe and fits with the inner side of the steel pipe. The first sealing tube is ring-shaped and is arranged inside the first socket ring.

[0017] In summary, an annular concrete lining is poured inside the steel pipe. After the concrete lining reaches a certain strength, a grouting material is injected between the inner wall of the steel pipe and the outer wall of the concrete lining through the grouting hole using a high-pressure grouting pump to form a grouting layer, forcing the inner diameter of the steel pipe to become larger and separate from the concrete lining, so that the concrete steel pipe has the characteristics of high cost performance, strong resistance to internal water pressure and external load, and excellent internal and external corrosion resistance.

[0018] By setting up the sealing assembly, the two ends of the steel pipe can be sealed during grouting, ensuring that during the pressure grouting operation, the ends of the concrete lining and the grouting layer are well sealed on the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural cross-sectional view of Embodiment 1 of the present application;

[0020] Figure 2 is a structural cross-sectional view from another perspective of the first embodiment of the present application;

[0021] Figure 3 It is a structural diagram of Embodiment 2 of the present application;

[0022] Figure 4 It is a schematic diagram of the structure of the sealing assembly and the steel pipe in the second embodiment of the present application;

[0023] Figure 5 It is a schematic diagram of the structure of the sealing assembly and the steel pipe in the third embodiment of the present application;

[0024] Figure 6 It is a schematic diagram of the structure of the sealing assembly and the steel pipe in the fourth embodiment of the present application;

[0025] Figure 7 It is a schematic diagram of the structure of the sealing assembly and the steel pipe in the fifth embodiment of the present application;

[0026] Figure 8 It is a structural schematic diagram of the sealing assembly and the steel pipe in the sixth embodiment of the present application;

[0027] Fig. 9 It is a schematic diagram of the structure of the sealing assembly and the steel pipe in Example 7 of the present application.

[0028] Figure numerals: 1, steel pipe; 2, grouting layer; 3, concrete lining; 4, first socket ring; 5, first sealing pipe; 6, first plug ring; 601, first mounting ring; 602, first connecting ring; 603, first plug-in ring; 7, second sealing pipe; 8, grouting pump; 9, water pump; 10, three-way valve; 11, flexible hose; 12, grouting hole; 13, second sealing rubber ring; 14, first sealing rubber ring. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0031] The following is combined with Figure 1-9 This application is further described in detail.

[0032] Embodiment 1, refer to Figure 1 and 2 A prestressed concrete steel pipe comprises: a steel pipe 1, a grouting layer 2 and a concrete lining 3, wherein the grouting layer 2 is arranged between the steel pipe 1 and the concrete lining 3, so that an annular concrete lining 3 is cast inside the steel pipe 1, and after the concrete lining 3 reaches a certain strength, a grouting material is injected between the inner wall of the steel pipe 1 and the outer wall of the concrete lining 3 through the grouting hole 12 by a high-pressure grouting pump to form a grouting layer 2, forcing the inner diameter of the steel pipe 1 to become larger and separate from the concrete lining 3, so that annular tensile stress is generated inside the steel pipe 1 and annular precompression stress is generated in the concrete lining 3, thereby improving the concrete steel pipe's resistance to internal water pressure and external load. It has high rigidity, low production cost, excellent internal and external corrosion resistance, and will not burst after long-term use. Its performance is better than that of ductile iron pipes, steel pipes and prestressed steel cylinder concrete pipes.

[0033] Example 2, reference Figure 1 and 2 , a prestressed concrete steel pipe, used for processing, but not limited to processing a prestressed concrete steel pipe recorded in Example 1, including a grouting device for grouting,

[0034] The steps include:

[0035] A sealing assembly for sealing both ends of the grouting layer 2 is arranged on the steel pipe 1;

[0036] A grouting hole 12 for grouting is provided (the grouting hole 12 can be opened on the steel pipe 1 or on the sealing component) and is closed with bolts;

[0037] Place the sealing assembly on the steel pipe 1;

[0038] Cast an annular concrete lining 3 inside the steel pipe 1 (the concrete lining 3 can be cast by vertical vibration, or the concrete lining 3 can be formed by a core mold vibration process or a radial extrusion process depending on the grouting pressure);

[0039] After the concrete lining reaches a certain strength through accelerated curing, the bolts at the grouting holes 12 are removed, and the grouting device injects grouting material (including cement paste, liquid epoxy resin or other curable liquid materials) between the concrete lining 3 and the steel pipe 1 through the grouting holes 12 to form a grouting layer 2;

[0040] The grouting layer 2 is kept at a constant pressure by the grouting device until the grouting layer 2 solidifies (accelerated curing can be used to solidify it);

[0041] The grouting holes 12 are closed by bolts or welding.

[0042] In this way, an annular concrete lining 3 is poured inside the steel pipe 1. After the concrete lining 3 reaches a certain strength, a grouting material is injected between the inner wall of the steel pipe 1 and the outer wall of the concrete lining 3 through the grouting hole 12 by a grouting device to form a grouting layer 2, forcing the inner diameter of the steel pipe 1 to become larger and separate from the concrete lining 3. While maintaining a constant pressure on the grouting layer 2, the curing is accelerated to solidify the grouting layer 2, so that the steel pipe 1 generates a set tensile stress in the circumferential direction, and the concrete lining 3 generates a set compressive stress in the circumferential direction, so that the manufactured prestressed concrete steel pipe has the ability to resist internal water pressure and external loads. By setting a sealing component, the two ends of the steel pipe 1 are sealed during grouting, ensuring that during the pressure grouting operation, the ends of the concrete lining 3 and the grouting layer 2 are well sealed on the steel pipe 1.

[0043] refer to Figure 3 and 4The sealing assembly includes a first socket ring assembly and a first spigot ring assembly; the first socket ring assembly includes a first socket ring 4 arranged at one end of the steel pipe 1 and a first sealing tube 5 arranged inside the first socket ring 4, the first sealing tube 5 extends to the inside of the steel pipe 1, and the first spigot ring assembly includes a first spigot ring 6 and a second sealing tube 7 (the grouting hole 12 can be opened at a position between the connection between the first sealing tube 5 and the first socket ring 4 and the connection between the second sealing tube 7 and the first spigot ring 6 (steel pipe 1, part of the first socket ring The first socket ring 6 comprises a first mounting ring 601, a first connecting ring 602 and a first plug-in ring 603 adapted to the first socket ring 4, the two ends of the first connecting ring 602 are respectively connected to the first mounting ring 601 and the first plug-in ring 603, one end of the first mounting ring 601 extends to the inner side of the steel pipe 1 and fits with the inner side of the steel pipe 1, one end of the second sealing tube 7 is connected to the inner side of the first plug-in ring 603, and the second sealing tube 7 is close to the first socket ring 4. A gap is left between one end of the steel pipe 1 and the first socket ring 6; a sealing assembly for sealing the two ends of the grouting layer 2 is arranged on the steel pipe 1, including: setting the second sealing tube 7 on the inner side of the first socket ring 6, setting the first sealing tube 5 on the inner side of the first socket ring 4, and then extending one end of the first socket ring 6 to the inner side of the steel pipe 1 and welding it, and welding the first socket ring 4 to the other end of the steel pipe 1. In this way, the steel pipe 1 welded with the first socket ring assembly and the first socket ring assembly is used as an external mold. When forming the concrete lining 3, on the one hand, the concrete lining 3 is made to be close to the steel pipe 1, and on the other hand, the first sealing tube 5 and the second sealing tube 7 are well buried in the concrete. Both aspects create good conditions for the sealing of the grouting layer 2 before it solidifies, so that during grouting, the two ends of the adjacent parts of the steel pipe 1 and the concrete lining 3 are blocked, and when using the concrete steel pipe described in this application, the first socket ring 6 is inserted into the first socket ring 4 of another concrete steel pipe to connect the two adjacent prestressed concrete steel pipes to finally form a pipeline.

[0044] refer to Figure 3 and 4 , one end of the first socket ring 4 extends to the inner side of the steel pipe 1 and fits with the inner side of the steel pipe 1, and one end of the first sealing tube 5 extends to the inner side of the steel pipe 1; welding the first socket ring 4 to the other end of the steel pipe 1 includes: one end of the first socket ring 4 extends to the inner side of the steel pipe 1 and is welded. In this way, the end of the first socket ring 4 and the first sealing tube 5 are used to form a first socket ring assembly to close one end of the steel pipe 1, and the end of the first spigot ring 6 and the second sealing tube 7 are used to form a first spigot ring assembly to close the other end of the steel pipe 1. During grouting, the two ends of the connection between the steel pipe 1 and the concrete lining 3 are sealed.

[0045] Further optimization is that the outer annular surfaces of the steel pipe 1, the first socket ring 4 and the first plug ring 6 are all provided with an anti-corrosion layer; the step also includes: after the grouting hole 12 is closed by bolts, the outer annular surfaces of the steel pipe 1, the first socket ring 4 and the first plug ring 6 are all coated with an anti-corrosion layer. In this way, according to the anti-corrosion requirements, anti-corrosion layers such as PE, three oils and two cloths, epoxy coal tar, epoxy powder spraying, polyurethane coating, steel wire cement mortar protective layer, etc. can be used for anti-corrosion, and stainless steel can also be used to make the steel pipe 1, the first socket ring 4 and the first plug ring 6, so that there is no need to set an anti-corrosion layer.

[0046] refer to Figure 3 The grouting device includes a grouting pump 8, a water pump 9, a three-way valve 10 and a flexible hose 11. The grouting pump 8 and the water pump 9 are respectively connected to the two inlet ends of the three-way valve 10 through pipelines, and one end of the flexible hose 11 is connected to the outlet end of the three-way valve 10; the grouting method of the grouting device includes: during grouting, the suspended end of the flexible hose 11 is connected to the grouting hole 12, the three-way valve 10 connects the grouting pump 8 with the flexible hose 11, the water pump 9 is disconnected from the flexible hose 11, and the grouting pump 8 performs grouting of the grouting material until a grouting layer 2 is formed; after the pressure of the grouting layer 2 is basically stable, the three-way valve 10 disconnects the grouting pump 8 from the flexible hose 11, and at the same time the water pump 9 is connected to the flexible hose 11, and the water pump 9 injects water into the flexible hose 11 to provide a constant pressure to the remaining grouting material in the flexible hose 11, thereby making the pressure in the grouting layer 2 constant until the grouting layer 2 is completely cured. Thus, through the above technical solution, when grouting is adopted, the three-way valve 10 connects the grouting pump 8 with the flexible hose 11, and the grouting pump 8 completes the grouting filling operation of the grouting material. After the pressure of the grouting layer 2 reaches the set pressure and is basically stable, the three-way valve 10 is operated to disconnect the grouting pump 8 from the flexible hose 11, and connect the water pump 9 to the flexible hose 11 (the switching time of the grouting pump 8 and the water pump 9 is before the initial setting of the grouting layer 2 and after the pressure of the grouting layer 2 is basically stable, wherein the setting of the length and diameter of the flexible hose 11 is determined according to the amount of grouting required for the entire grouting layer from the beginning of the constant pressure to the solidification of the grouting layer). A water pump 9 is used to provide a constant pressure for the grouting layer 2 until the grouting layer 2 is completely cured. During the curing process of the grouting layer 2, the pipe joint connecting the grouting pump 8 and the three-way valve 10 can be removed, and one joint of the three-way valve 10 and the grouting pump 8 can be cleaned. When the grouting layer 2 is completely cured, the flexible hose 11 is cleaned to complete the entire grouting operation, so as to avoid the grouting pump 8 being kept running during the process of using the grouting pump 8 to maintain a constant pressure in the grouting layer 2, resulting in the grouting material curing in the grouting pump 8 or the corresponding pipeline, causing damage to the grouting pump 8 and insufficient prestressing of the produced concrete steel pipe.

[0047] Further optimization is that the steel pipe 1 can be made of steel of different materials and grades, such as Q235, Q355, etc., according to design conditions and economic conditions, and can also be made of stainless steel.

[0048] In addition to the above embodiments, this application also includes reference Figure 5 The third embodiment shown is different in that one end of the first socket ring 4 is connected to the end of the steel pipe 1, and one end of the first sealing tube 5 extends to the inner side of the steel pipe 1; welding the first socket ring 4 to the other end of the steel pipe 1 includes: aligning and welding the end of the first socket ring 4 with the end of the steel pipe 1. In this way, the end of the first socket ring and the first sealing tube 5 form a first socket ring assembly to close one end of the steel pipe 1, and the end of the first spigot ring 6 and the second sealing tube 7 form a first spigot ring assembly to close the other end of the steel pipe 1. During grouting, the two ends of the connection between the steel pipe 1 and the concrete lining 3 are sealed, and the length of the first sealing tube 5 extending into the concrete part is long enough to prevent the pressurized liquid from climbing over and seeping out from the inner side of the first sealing tube 5.

[0049] In the second or third embodiment, refer to Figure 4 and 5A first sealing rubber ring 14 is arranged between the first socket ring 4 and the first sealing tube 5, and a second sealing rubber ring 13 is arranged between the first plug ring 6 and the second sealing tube 7; the first sealing tube 5 is arranged on the inner side of the first socket ring 4, comprising: placing the first socket ring 4 on the expansion machine and keeping it still after the expansion (the expansion machine is a general equipment in the prestressed steel cylinder concrete pipe manufacturing industry. Its working principle is to pull down the vertical wedge block through the oil cylinder, push the horizontal wedge block and the expansion module to expand the diameter, and force the first socket ring 4 or the first plug ring 6 to be circumferentially tensile and exceed the yield limit, produce plastic deformation, and thus accurately determine the size), opening a rubber groove on the outside and installing a first sealing tube 7 having a cross-sectional diameter greater than the depth of the rubber groove The first sealing tube 5 of the sealing rubber ring 14 is placed on the inner side of the first socket ring 4, and the rounding machine is started again to expand the first sealing tube 5, so that the first sealing rubber ring 14 is deformed by pressure to produce a sealing effect, and then the whole is taken out; the second sealing tube 7 is set on the inner side of the first plug ring 6, including: the first plug ring 6 is placed on the rounding machine and expanded and kept motionless, and the second sealing tube 7 with a rubber groove on the outside and a second sealing rubber ring 13 with a cross-sectional diameter greater than the depth of the rubber groove is placed on the inner side of the first plug ring 6, and the rounding machine is started again to expand the second sealing tube 7, so that the second sealing tube 7 is deformed by pressure to produce a sealing effect, and then the whole is taken out. After the first socket ring 4 (first plug ring 6) is expanded, it remains in place, and the oil cylinder is operated to reduce the diameter of the expansion module, and the first sealing tube 5 (second sealing tube 7) with a rubber groove is placed in it. The second sealing rubber ring 13 (first sealing rubber ring 14) is installed in the rubber groove in advance, and the initial cross-sectional diameter of the second sealing rubber ring 13 (first sealing rubber ring 14) (generally 2 times the depth of the rubber groove) is greater than the depth of the rubber groove. After the first sealing tube 5 (second sealing tube 7) is placed in the expansion machine, the expansion machine is operated to expand the diameter of the expansion module, forcing the first sealing tube 5 (second sealing tube 7) to be circumferentially tensile and exceed the yield limit, resulting in plastic deformation, and the outer annular surface of the first sealing tube 5 (second sealing tube 7) and the first socket ring 4 ( The expansion machine is stopped immediately after the inner ring surface of the first socket ring 6 is in contact). In this way, the initial cross-sectional diameters of the first sealing rubber ring 14 and the second sealing rubber ring 13 are larger than the corresponding rubber groove depth. During expansion, the first sealing rubber ring 14 and the second sealing rubber ring 13 are compressed and deformed until the first sealing rubber ring 14 contacts the first socket ring 4 or the second sealing rubber ring 13 contacts the ring surface of the first socket ring 6. The expansion machine is stopped and then the whole is taken out. This treatment enables the clamping force of the first sealing rubber ring 14 and the second sealing rubber ring 13 to prevent the pressurized liquid from passing through between the first sealing tube 5 and the first socket ring 4 or between the second sealing tube 7 and the first socket ring 6, thereby ensuring the sealing.

[0050] In addition to the above embodiments, this application also includes reference Figure 6The fourth embodiment shown is different in that one end of the first socket ring 4 extends to the inner side of the steel pipe 1 and fits with the inner side of the steel pipe 1, one end of the first sealing tube 5 extends to the inner side of the steel pipe 1, the diameter of the first sealing tube 5 close to the second sealing tube 7 is smaller than the diameter of the end away from the second sealing tube 7, and the diameter of the second sealing tube 7 close to the first sealing tube 5 is smaller than the diameter of the end away from the first sealing tube 5; arranging the first sealing tube 5 on the inner side of the first socket ring 4 includes: welding the end with a larger diameter of the first sealing tube 5 to the inner side of the end of the first socket ring 4 close to the steel pipe 1; arranging the second sealing tube 7 on the inner side of the first plug ring 6 It includes: welding the end with a larger diameter of the second sealing tube 7 to the inner side of the end of the first socket ring 6 away from the steel pipe 1; welding the first socket ring 4 to the other end of the steel pipe 1 includes: extending one end of the first socket ring 4 to the inner side of the steel pipe 1 and welding it, overlapping the first socket ring 4 with the steel pipe 1 and setting the first sealing tube 5 and the second sealing tube 7, so that during grouting, the grouting material is guided to flow to the inner side of the steel pipe 1 to prevent the grouting material from flowing out of the steel pipe 1, so as to play a sealing role, and the length of the first sealing tube 5 and the second sealing tube 7 extending into the concrete part is long enough to prevent the pressurized liquid from overflowing and seeping out from the inner side of the first sealing tube 5 and the second sealing tube 7.

[0051] In addition to the above embodiments, this application also includes reference Figure 7The fifth embodiment shown is different in that one end of the first socket ring 4 is connected to the end of the steel pipe 1, one end of the first sealing tube 5 extends to the inner side of the steel pipe 1, the diameter of the first sealing tube 5 close to the second sealing tube 7 is smaller than the diameter of the end away from the second sealing tube 7, the diameter of the second sealing tube 7 close to the first sealing tube 5 is smaller than the diameter of the end away from the first sealing tube 5, the first sealing tube 5 and the second sealing tube 7 can be conical tubes or conical corrugated tubes (in the actual production process, according to the product performance requirements, a pipeline with a corresponding shape that can form a sealing surface in the radial direction of the steel pipe 1 is selected), the first sealing tube 5 and the second sealing tube 7 The end with a smaller diameter is relatively arranged; arranging the first sealing tube 5 on the inner side of the first socket ring 4 includes: welding the end with a larger diameter of the first sealing tube 5 to the inner side of the end of the first socket ring 4 close to the steel pipe 1; arranging the second sealing tube 7 on the inner side of the first plug ring 6 includes: welding the end with a larger diameter of the second sealing tube 7 to the inner side of the end of the first plug ring 6 away from the steel pipe 1; welding the first socket ring 4 to the other end of the steel pipe 1 includes: arranging the end of the first socket ring 4 opposite to the end of the steel pipe 1 and welding; placing the sealing assembly on the steel pipe 1 also includes: arranging the second sealing tube 7 on the inner side of the first plug ring 6, and arranging the first sealing tube 5 before the inner side of the first socket ring 4. In this way, the first sealing tube 5 and the second sealing tube 7 are used so that during grouting, the grouting material is guided to flow to the inner side of the steel pipe 1 to prevent the grouting material from flowing out of the steel pipe 1, thereby achieving a sealing effect. In addition, the length of the first sealing tube 5 and the second sealing tube 7 extending into the concrete part is long enough to prevent the pressurized liquid from overflowing and seeping out from the inner side of the first sealing tube 5 and the second sealing tube 7.

[0052] In addition to the above embodiments, this application also includes reference Figure 8 The sixth embodiment shown is different in that one end of the first socket ring 4 is connected to the end of the steel pipe 1, the first sealing tube 5 is annular, and the first sealing tube 5 is arranged inside the first socket ring 4; welding the first socket ring 4 to the other end of the steel pipe 1 includes: aligning and welding the end of the first socket ring 4 with the end of the steel pipe 1, so that the first sealing tube 5 is annular, and the first socket ring 4 is connected to the steel pipe 1 to close the gap between the concrete lining and the steel pipe, so that when grouting, the grouting material reaches the first sealing ring 5 and is blocked by the first sealing ring 5, preventing the grouting material from flowing out of the steel pipe, thereby playing a sealing role.

[0053] In addition to the above embodiments, this application also includes reference Fig. 9The seventh embodiment shown is different in that one end of the first socket ring 4 extends to the inner side of the steel pipe 1 and fits with the inner side of the steel pipe 1, the first sealing tube 5 is annular, and the first sealing tube 5 is arranged inside the first socket ring 4; welding the first socket ring 4 to the other end of the steel pipe 1 includes: one end of the first socket ring 4 extends to the inner side of the steel pipe 1 and is welded, so that the first sealing tube 5 is annular, and one end of the first socket ring 4 extends to the inner side of the steel pipe 1 and is welded, closing the gap between the concrete lining and the steel pipe, so that during grouting, the grouting material is first blocked by the first socket ring 4, and when the grouting material reaches the first sealing ring 5, it is blocked by the first sealing ring 5 again, preventing the grouting material from flowing out of the steel pipe, thereby achieving a sealing effect.

[0054] In summary: during the processing method described in the present application, the concrete lining 3 will be elastically compressed during the pressurization process of the grouting layer 2, but the grouting layer 2 has not yet solidified. As the grouting process proceeds, the prestress loss caused by the elastic compression of the concrete lining 3 will be compensated. Therefore, there will be no loss of prestress in the pipe body caused by the elastic compression of the concrete lining 3.

[0055] The prestressed concrete steel pipe is manufactured by the manufacturing technology described in the present application. When the strength of the concrete lining 3 reaches the demoulding strength, the concrete lining 3 can be demoulded and then naturally cured (preferably natural curing by sprinkling water with low energy consumption), the mold occupancy time is short, and the investment in production equipment is small.

[0056] When the manufacturing technology described in the present application is used to manufacture prestressed concrete steel pipes with low grouting pressure, the core mold vibration process or radial extrusion process can be used to produce the prestressed concrete steel pipes, eliminating the inner mold, and the same time output is large, the required concrete fluidity is low, the slump is small, and the cement consumption is saved;

[0057] The first sealing tube 5 and the second sealing tube 7 are stretched by the expansion process to make them exceed the elastic limit and close to the first socket ring 4 or the first plug ring 6, and the first sealing rubber ring 14 and the second sealing rubber ring 13 are compressed and deformed to resist the leakage trend of the grouting layer 2, with high precision and high efficiency;

[0058] The grouting operation is performed by using a grouting pump 8, and a constant pressure water pump 9 is used to provide a constant pressure for the grouting layer 2. The two pumps are switched by a three-way valve 10, so that the grouting pump 8 and related pipelines are stopped before the grouting material solidifies, which is convenient for cleaning. A pressure-resistant flexible hose 11 is used to connect the three-way valve 10 to the grouting hole 12. After the grouting material in the flexible hose 11 is solidified, it can be cleaned by repeatedly bending and beating;

[0059] At present, the mainstream pipes used in the field of water diversion and water supply have limitations in terms of cost, performance, caliber, service life, etc. Compared with the ductile iron pipes, steel pipes and prestressed steel cylinder concrete pipes commonly used in the field, the present application has the advantages of strong corrosion resistance, strong resistance to internal water pressure, high rigidity and low production cost. In addition, the repair of this product is relatively simple. It only requires welding steel plates, drilling holes, injecting epoxy resin to restore prestress and finally performing external anti-corrosion. The present application can be applied to water conservancy and municipal water projects, inter-basin water diversion projects, urban and rural water supply projects, rural drinking water safety projects, comprehensive utilization of water conservancy hub projects, irrigation area transformation and supporting facilities construction, efficient water transmission and distribution, promotion and application of water-saving irrigation technology, farmland water conservancy facilities construction projects, etc.

[0060] The present application also has the advantages of stable and reliable product quality (the concrete lining 3 is always in a non-disturbance state from the initial setting of the concrete to the curing to the demoulding strength, with good integrity and clear principles for judging product quality) and low quality cost (even if leakage occurs due to special circumstances and causes local or overall prestressing deficiency, it can be remedied by replenishing the grouting material); and from the perspective of structural design, the concrete lining 3 will be elastically compressed during the pressurization of the grouting layer 2, but at this time the grouting layer 2 has not yet solidified. As the grouting process proceeds, the prestress loss caused by the elastic compression of the concrete lining 3 is immediately compensated, so there is no prestress loss of the pipe body caused by the elastic compression of the concrete lining 3. The prestress loss caused by concrete shrinkage creep is negatively correlated with the concrete cube compressive strength when stress is applied and the age of concrete. The manufacturing technology described in the present invention is used to manufacture prestressed concrete steel pipes, and the time for applying prestress can be postponed as much as possible. The higher the concrete cube compressive strength and the longer the concrete age, the smaller the prestress loss caused by concrete shrinkage creep.

[0061] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A prestressed concrete steel pipe, characterized in that: include: A steel pipe (1), a grouting layer (2) and a concrete lining (3), wherein the grouting layer (2) is arranged between the steel pipe (1) and the concrete lining (3); The steel pipe (1) is provided with sealing components for sealing both ends of the grouting layer (2); The sealing assembly includes a first socket ring assembly and a first spigot ring assembly; The first bell ring assembly comprises a first bell ring (4) arranged at one end of the steel pipe (1) and a first sealing tube (5) arranged inside the first bell ring (4); The first socket ring assembly comprises a first socket ring (6) and a second sealing tube (7), wherein the first socket ring (6) comprises a first mounting ring (601), a first connecting ring (602) and a first plug-in ring (603) adapted to the first socket ring (4), wherein the two ends of the first connecting ring (602) are respectively connected to the first mounting ring (601) and the first plug-in ring (603), one end of the first mounting ring (601) extends to the inner side of the steel pipe (1) and fits the inner side of the steel pipe (1), one end of the second sealing tube (7) is connected to the inner side of the first plug-in ring (603), and a gap is left between the end of the second sealing tube (7) close to the steel pipe (1) and the first socket ring (6).

2. The prestressed concrete steel pipe according to claim 1, characterized in that: One end of the first socket ring (4) extends to the inner side of the steel pipe (1) and fits the inner side of the steel pipe (1), and one end of the first sealing tube (5) extends to the inner side of the steel pipe (1).

3. The prestressed concrete steel pipe according to claim 1, characterized in that: One end of the first socket ring (4) is connected to the end of the steel pipe (1), and one end of the first sealing tube (5) extends to the inside of the steel pipe (1).

4. The prestressed concrete steel pipe according to claim 1, characterized in that: One end of the first socket ring (4) extends to the inner side of the steel pipe (1) and fits with the inner side of the steel pipe (1); one end of the first sealing tube (5) extends to the inner side of the steel pipe (1); the diameter of the end of the first sealing tube (5) close to the second sealing tube (7) is smaller than the diameter of the end away from the second sealing tube (7); and the diameter of the end of the second sealing tube (7) close to the first sealing tube (5) is smaller than the diameter of the end away from the first sealing tube (5).

5. The prestressed concrete steel pipe according to claim 1, characterized in that: One end of the first socket ring (4) is connected to the end of the steel pipe (1), one end of the first sealing tube (5) extends to the inner side of the steel pipe (1), the diameter of the end of the first sealing tube (5) close to the second sealing tube (7) is smaller than the diameter of the end away from the second sealing tube (7), and the diameter of the end of the second sealing tube (7) close to the first sealing tube (5) is smaller than the diameter of the end away from the first sealing tube (5).

6. A prestressed concrete steel pipe according to claim 2 or 3, characterized in that: A first sealing rubber ring (14) is provided between the first socket ring (4) and the first sealing tube (5), and a second sealing rubber ring (13) is provided between the first socket ring (6) and the second sealing tube (7).

7. The prestressed concrete steel pipe according to claim 1, characterized in that: One end of the first socket ring (4) is connected to the end of the steel pipe (1); the first sealing tube (5) is ring-shaped; the first sealing tube (5) is arranged inside the first socket ring (4).

8. The prestressed concrete steel pipe according to claim 1, characterized in that: One end of the first socket ring (4) extends to the inner side of the steel pipe (1) and fits the inner side of the steel pipe (1); the first sealing tube (5) is ring-shaped and is arranged inside the first socket ring (4).

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