Ductile iron jacking pipe assembly and production process

Abstract

A ductile iron jacking pipe assembly and production process. It includes a sleeve jacking pipe assembly, a thrust flange, a front jacking pipe group, and a rear jacking pipe group. The sleeve jacking pipe assembly is arranged on the rear jacking pipe group, a thrust flange is provided between the front jacking pipe group and the rear jacking pipe group, and one side of the sleeve jacking pipe assembly abuts against the front jacking pipe group. The beneficial effects of the present invention are: simplifying the ductile iron jacking pipe production process, optimizing and enhancing the flexibility of the ductile iron jacking pipe, eliminating the need for remelting and smelting, reducing energy consumption, avoiding a significant increase in costs, and increasing the safety of the ductile iron jacking pipe. The sleeve ductile iron jacking pipe is completely produced using mechanized and automated control, avoiding human-induced instability factors, and can significantly improve the safety and stability of the ductile iron jacking pipe. It simplifies the ductile iron jacking pipe production process, improves the production efficiency of the ductile iron jacking pipe, and reduces the production cost of the ductile iron jacking pipe.

Description

Technical Field

[0001] The invention relates to the technical field of ductile iron jacking pipes, and in particular to a ductile iron jacking pipe assembly and a production process. Background Art

[0002] At present, domestic ductile iron jacking pipes are all made of ordinary ductile iron pipes (QT420) as the basis, with flanges welded on the socket end and reinforcing ribs (Q235) and concrete poured on the outside. Figure 4 .

[0003] In the production of conventional ductile iron pipe jacking, the flanges and reinforcing plates are made of different materials (Q235 and QT420), making welding difficult and prone to defects such as porosity, slag inclusions, and cracks. The flanges obstruct the outer wall concrete, preventing it from being poured in a single pass. The area below 15 cm from the spigot requires a week of manual plastering. These issues significantly restrict the mass production of ductile iron pipe jacking, significantly increasing its production cost: the direct cost of ductile iron pipe jacking is nearly 1,000 yuan higher per meter than that of ductile iron open-cut pipe. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies and defects in the prior art and provide a ductile iron jacking pipe assembly and production process, simplify the ductile iron jacking pipe production process, eliminate the rib plate fixing welding / flange fixing welding / manual plastering steps in the production of conventional ordinary ductile iron jacking pipes, optimize and enhance the flexibility of the ductile iron jacking pipe, eliminate the need for remelting and smelting, reduce energy consumption, avoid a significant increase in costs, and increase the safety of the ductile iron jacking pipe. The sleeve ductile iron jacking pipe is produced entirely under mechanized and automated control, avoiding human-induced instability factors, significantly improving the safety and stability of the ductile iron jacking pipe, simplifying the ductile iron jacking pipe production process, improving the production efficiency of the ductile iron jacking pipe, and reducing the production cost of the ductile iron jacking pipe.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a ductile iron jacking pipe assembly and a production process, which includes a sleeve jacking pipe assembly 1, a thrust flange 2, a front jacking pipe group 3, and a rear jacking pipe group 4. The sleeve jacking pipe assembly 1 is arranged on the rear jacking pipe group 4, a thrust flange 2 is provided between the front jacking pipe group 3 and the rear jacking pipe group 4, and one side of the sleeve jacking pipe assembly 1 is abutted against the front jacking pipe group 3. The sleeve jacking pipe assembly 1 includes a T-shaped sleeve 11, a sealing rubber ring 12, a concrete outer wall 13, and a short tube core 14. The T-shaped sleeve 11 is connected to the short tube core 14, and a sealing rubber ring 12 is provided between the T-shaped sleeve 11 and the short tube core 14. A concrete outer wall 13 is provided on the outer side of the short tube core 14.

[0006] A technical field of ductile iron jacking pipes, the production process of which is: ductile iron pipe centrifugation - lining centrifugation - sleeve centrifugation - concrete outer wall pouring - outer wall repair - factory delivery, the specific steps of the process are as follows: ductile iron pipe centrifugation: use an electric furnace to melt blast furnace molten iron and adjust it so that the molten iron composition meets the corresponding standards for ductile iron; pour qualified ductile iron molten iron into the corresponding centrifuge mold through a centrifuge, so that the ductile iron molten iron densely fills the entire mold under the action of centrifugal force, and ensure that the pipe weight and wall thickness meet the requirements of GB13295 or corresponding orders; lining centrifugation: after the above-mentioned ductile iron pipe is formed, the dimensions of each part are measured and the water pressure sealing test is carried out, the cement mortar is passed through the lining centrifuge for lining centrifugation. After the inner lining is centrifugally formed, it needs to be polished to ensure that the inner lining is smooth and reduce water resistance; Sleeve centrifugation: Use ductile iron liquid to fill it into the sleeve mold through a sleeve centrifuge or gravity forming method. After the sleeve is formed and cooled, it is demolded for size measurement and water pressure test. It will be ready for use after passing the inspection; Concrete outer wall pouring: Use the top pipe outer mold to pour the outer wall concrete. After the pouring is completed, steam is introduced for steaming operation to accelerate the flow of the mold; Repair: After the concrete outer wall is formed, the defects of the inner and outer walls are repaired uniformly, and the concrete outer wall and socket are treated with anti-corrosion treatment; Factory delivery: After the repair is completed, the quality inspectors of the Quality and Planning Department will conduct various pre-delivery tests according to the corresponding standards, and they will be allowed to leave the factory after passing the inspection.

[0007] Furthermore, the front top pipe group 3 is composed of a front sleeve 31 and a front double-inserted short tube 32, and the rear top pipe group 4 is composed of a rear double-inserted short tube 41 and a rear sleeve 42. One end of the front double-inserted short tube 32 is connected to the front sleeve 31, and the other end of the front double-inserted short tube 32 is socketed with the rear sleeve 42, and the rear sleeve 42 is connected to the rear double-inserted short tube 41.

[0008] Furthermore, the T-shaped sleeve 11 is formed by centrifugal casting of ductile iron molten iron using a special mold; the double short tube core 14 is centrifugal molded by ductile iron molten iron using a ductile iron pipe mold; the concrete outer wall 13 is vertically cast by a ductile iron top pipe outer mold; and a sealing rubber ring 12 needs to be installed when the T-shaped sleeve 11 is connected to the short tube core 14 to play a sealing role.

[0009] Furthermore, the front sleeve 31 , the rear sleeve 42 , the front double-inserted short tube 32 and the rear double-inserted short tube 41 are all made of ductile iron.

[0010] Furthermore, the thickness of the stress-bearing surfaces of the front sleeve 31 and the rear sleeve 42 are both greater than the thickness of the front double-inserted short tube 32 and the rear double-inserted short tube 41 .

[0011] Furthermore, the thrust flange 2 is arranged inside the rear sleeve 42 .

[0012] After adopting the above technical solution, the beneficial effects of the present invention are:

[0013] 1. Simplify the production process of ductile iron jacking pipes and eliminate the steps of reinforcing plate fixing welding / flange fixing welding / manual plastering in the production of conventional ordinary ductile iron jacking pipes.

[0014] 2. The flexibility of ductile iron jacking pipes has been optimized and enhanced. If the length of conventional ductile iron jacking pipes needs to be customized, it will cause a significant increase in cost and energy consumption (for example, if a 2-meter effective length jacking pipe is produced by conventional methods, a 4-meter-long pipe needs to be cut off. The cut-off pipe is a waste pipe and needs to be returned to the furnace for reheating and re-smelting). However, the sleeve ductile iron jacking pipe can make full use of the cut-off straight pipe sections of various lengths, eliminating the need for re-smelting, reducing energy consumption and avoiding a significant increase in costs;

[0015] 3. Increased safety of ductile iron pipe jacking. Conventional ductile iron pipe jacking requires welding of Q235 reinforcing ribs and flanges. The welds between the reinforcing ribs, flanges, and the ductile iron pipe body are key nodes for transmitting the jacking force. The quality and strength of the welds depend entirely on the workers' welding skills and sense of responsibility. Human factors are the most unstable factor in production. However, sleeve ductile iron pipe jacking is fully mechanized and automated, avoiding human-induced instability and significantly improving the safety and stability of ductile iron pipe jacking.

[0016] 4. It supports the production of ductile iron jacking pipes with a length of less than 6 meters, can make full use of the effective length of various defective pipes, avoid the high energy consumption caused by the overall recycling of scrapped pipes, and actively respond to the green environmental protection, energy conservation and emission reduction policies advocated by the country. It can greatly reduce the production and manufacturing costs of ductile iron pipe factories and ductile iron pipe fitting factories and accessories factories, improve the efficiency of the above-mentioned factories, simplify the production process of ductile iron jacking pipes, improve the production efficiency of ductile iron jacking pipes, and reduce the production cost of ductile iron jacking pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 This is a schematic structural diagram of the sleeve jacking assembly 1 of the present invention.

[0020] Figure 3 It is a force analysis diagram of the present invention.

[0021] Figure 4 This is the structural diagram of ordinary ductile iron jacking pipe.

[0022] Explanation of the accompanying reference numerals: sleeve jacking pipe assembly 1, thrust flange 2, front jacking pipe group 3, rear jacking pipe group 4, T-shaped sleeve 11, sealing rubber ring 12, concrete outer wall 13, short pipe core 14, front sleeve 31, front double-inserted short pipe 32, rear double-inserted short pipe 41, rear sleeve 42. DETAILED DESCRIPTION

[0023] See Figure 1-Figure 3 As shown, the technical solution adopted in this specific embodiment is: it includes a sleeve jacking pipe assembly 1, a thrust flange 2, a front jacking pipe group 3, and a rear jacking pipe group 4, the sleeve jacking pipe assembly 1 is arranged on the rear jacking pipe group 4, a thrust flange 2 is provided between the front jacking pipe group 3 and the rear jacking pipe group 4, and one side of the sleeve jacking pipe assembly 1 is abutted against the front jacking pipe group 3, the sleeve jacking pipe assembly 1 includes a T-shaped sleeve 11, a sealing rubber ring 12, a concrete outer wall 13, and a short tube core 14, the T-shaped sleeve 11 is connected to the short tube core 14, and a sealing rubber ring 12 is provided between the T-shaped sleeve 11 and the short tube core 14, and a concrete outer wall 13 is provided on the outer side of the short tube core 14.

[0024] To be more specific, the front top pipe group 3 is composed of a front sleeve 31 and a front double-inserted short tube 32, and the rear top pipe group 4 is composed of a rear double-inserted short tube 41 and a rear sleeve 42. One end of the front double-inserted short tube 32 is connected to the front sleeve 31, and the other end of the front double-inserted short tube 32 is socketed with the rear sleeve 42, and the rear sleeve 42 is connected to the rear double-inserted short tube 41.

[0025] More specifically, the T-shaped sleeve 11 is centrifugally cast from molten ductile iron using a dedicated mold. The double short tube core 14 is centrifugally molded from molten ductile iron using a ductile iron mold. The concrete outer wall 13 is vertically cast using a ductile iron top pipe outer mold. A sealing rubber ring 12 is installed to seal the connection between the T-shaped sleeve 11 and the short tube core 14. The outer diameter of the T-shaped sleeve 11 is manufactured according to the dimensions of GB / T 13295-2008.

[0026] More specifically, the front sleeve 31, the rear sleeve 42, the front double-inserted short tube 32 and the rear double-inserted short tube 41 are all made of ductile iron. Using ductile iron can avoid galvanic corrosion caused by different materials.

[0027] More specifically, the thickness of the bearing surface of the front sleeve 31 and the rear sleeve 42 is greater than the thickness of the front double-inserted short tube 32 and the rear double-inserted short tube 41. This can better ensure the safety of the entire system.

[0028] More specifically, the thrust flange 2 is arranged inside the rear sleeve 42. This arrangement method can reduce the volume of the sleeve and make it compact, and can also increase the rigidity of the sleeve to avoid accidental damage.

[0029] A technical field of ductile iron jacking pipes, the production process of which is: ductile iron pipe centrifugation - lining centrifugation - sleeve centrifugation - concrete outer wall pouring - outer wall repair - factory delivery, the specific steps of the process are as follows: ductile iron pipe centrifugation: use an electric furnace to melt blast furnace molten iron and adjust it so that the molten iron composition meets the corresponding standards for ductile iron; pour qualified ductile iron molten iron into the corresponding centrifuge mold through a centrifuge, so that the ductile iron molten iron densely fills the entire mold under the action of centrifugal force, and ensure that the pipe weight and wall thickness meet the requirements of GB13295 or corresponding orders; lining centrifugation: after the above-mentioned ductile iron pipe is formed, the dimensions of each part are measured and the water pressure sealing test is carried out, the cement mortar is passed through the lining centrifuge for lining centrifugation. After the inner lining is centrifugally formed, it needs to be polished to ensure that the inner lining is smooth and reduce water resistance; Sleeve centrifugation: Use ductile iron liquid to fill it into the sleeve mold through a sleeve centrifuge or gravity forming method. After the sleeve is formed and cooled, it is demolded for size measurement and water pressure test. It will be ready for use after passing the inspection; Concrete outer wall pouring: Use the top pipe outer mold to pour the outer wall concrete. After the pouring is completed, steam is introduced for steaming operation to accelerate the flow of the mold; Repair: After the concrete outer wall is formed, the defects of the inner and outer walls are repaired uniformly, and the concrete outer wall and socket are treated with anti-corrosion treatment; Factory delivery: After the repair is completed, the quality inspectors of the Quality and Planning Department will conduct various pre-delivery tests according to the corresponding standards, and they will be allowed to leave the factory after passing the inspection.

[0030] The working principle of the present invention is as follows: during the jacking construction, the jacking system generates a jacking force, which is transmitted to the front sleeve 31, and the front sleeve 31 transmits the jacking force to the thrust flange in the front sleeve 31, and the thrust flange transmits the jacking force to the front double-inserted short tube 32, and the front double-inserted short tube 32 transmits the jacking force to the thrust flange 2 in the rear sleeve 42, and the thrust flange 2 transmits the jacking force to the rear double-inserted short tube 41. In the transmission of the above force, the magnitude and direction of the force are unchanged. Among them, the T-shaped sleeve 11 is made of ductile iron molten iron and centrifugally cast through a special mold; the pipe bodies of the front double-inserted short tube 32 and the rear double-inserted short tube 41 are cut from ordinary ductile iron pipes or centrifugally cast from separate straight pipe molds, and the concrete outer wall 13 is cast with concrete from the mold, and the T-shaped sleeve 11, the front jacking pipe group 3, the rear jacking pipe group 4 and the sealing rubber ring 12 can be assembled into finished products in the factory and then shipped, or they can be sent in batches to the installation site for on-site assembly by the construction team.

[0031] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A ductile iron jacking pipe assembly, characterized in that: It comprises a sleeve jacking pipe assembly (1), a thrust flange (2), a front jacking pipe group (3), and a rear jacking pipe group (4); the sleeve jacking pipe assembly (1) is arranged on the rear jacking pipe group (4); a thrust flange (2) is provided between the front jacking pipe group (3) and the rear jacking pipe group (4); and one side of the sleeve jacking pipe assembly (1) abuts against the front jacking pipe group (3); The sleeve jacking assembly (1) comprises a T-shaped sleeve (11), a sealing rubber ring (12), a concrete outer wall (13), and a short pipe core (14); the T-shaped sleeve (11) is connected to the short pipe core (14), and a sealing rubber ring (12) is provided between the T-shaped sleeve (11) and the short pipe core (14); and the outer side of the short pipe core (14) is provided with a concrete outer wall (13); The front top tube group (3) is composed of a front sleeve (31) and a front double-inserted short tube (32), and the rear top tube group (4) is composed of a rear double-inserted short tube (41) and a rear sleeve (42). One end of the front double-inserted short tube (32) is connected to the front sleeve (31), and the other end of the front double-inserted short tube (32) is sleeved with the rear sleeve (42). The rear sleeve (42) is connected to the rear double-inserted short tube (41). The T-shaped sleeve (11) is formed by centrifugal casting of ductile iron molten iron using a special mold; the double short tube core (14) is formed by centrifugal casting of ductile iron molten iron using a ductile iron pipe mold; the concrete outer wall (13) is formed by vertical casting of a ductile iron top pipe outer mold; when the T-shaped sleeve (11) and the short tube core (14) are connected, a sealing rubber ring (12) is installed to play a sealing role; The front sleeve (31), the rear sleeve (42), the front double-inserted short tube (32) and the rear double-inserted short tube (41) are all made of ductile iron, and the thrust flange (2) is arranged inside the rear sleeve (42).

2. A ductile iron jacking pipe assembly according to claim 1, characterized in that: The thickness of the stress-bearing surfaces of the front sleeve (31) and the rear sleeve (42) are both greater than the thickness of the front double-inserted short tube (32) and the rear double-inserted short tube (41).

3. The ductile iron jacking pipe assembly according to claim 1, characterized in that: The invention also includes a production process of a ductile iron jacking pipe assembly, which is as follows: ductile iron pipe centrifugation - lining centrifugation - sleeve centrifugation - concrete outer wall pouring - outer wall repair - factory delivery, and the specific steps of the process are as follows: 1) Ductile iron pipe centrifugation: Use an electric furnace to smelt blast furnace molten iron and adjust it to ensure that the molten iron composition meets the corresponding ductile iron standards; the qualified ductile iron molten iron is poured into the corresponding centrifuge mold through a centrifuge, so that the ductile iron molten iron can densely fill the entire mold under the action of centrifugal force, and ensure that the pipe weight and wall thickness meet the requirements of GB13295 or the corresponding order; 2) Lining centrifugation: After the ductile iron pipe is formed, the dimensions of each part are measured, and the water pressure sealing test is carried out, the cement mortar is passed through the lining centrifuge for lining centrifugation. After the lining is centrifugally formed, it needs to be polished to ensure the lining is smooth and reduce water resistance; 3) Sleeve centrifugal: Use ductile iron liquid to fill the sleeve mold through a sleeve centrifuge or gravity forming method. After the sleeve is formed and cooled, it is demoulded and then dimensionally measured and hydraulically tested. It will be ready for use after passing the inspection. 4) Concrete outer wall pouring: Use the outer pipe mold to pour the outer wall concrete. After pouring, steam is introduced for steam curing to accelerate the mold circulation; 5) Repair: After the concrete outer wall is formed, the defects of the inner and outer walls are repaired uniformly, and anti-corrosion treatment is performed on the concrete outer wall and sockets; 6) Delivery: After the repair is completed, the quality inspectors of the Quality Control Department will conduct various pre-delivery tests according to the corresponding standards, and the products will be allowed to leave the factory after passing the tests.

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