CN111637277A - Internal-acting type nodular cast iron jacking pipe for whole trenchless pipeline construction - Google Patents

Internal-acting type nodular cast iron jacking pipe for whole trenchless pipeline construction Download PDF

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Publication number
CN111637277A
CN111637277A CN202010446546.5A CN202010446546A CN111637277A CN 111637277 A CN111637277 A CN 111637277A CN 202010446546 A CN202010446546 A CN 202010446546A CN 111637277 A CN111637277 A CN 111637277A
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China
Prior art keywords
section
socket
pipe
socket section
internal
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CN202010446546.5A
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Chinese (zh)
Inventor
周占虎
董雅君
官振兴
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Liaoning Aiweier Metal Forming Technology Co ltd
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Liaoning Aiweier Metal Forming Technology Co ltd
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Priority to CN202010446546.5A priority Critical patent/CN111637277A/en
Publication of CN111637277A publication Critical patent/CN111637277A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B22C9/24—Moulds for peculiarly-shaped castings for hollow articles

Abstract

A nodular cast iron jacking pipe for internal-acting integral non-excavation pipeline construction is disclosed, wherein one end of a cylinder section is connected with a socket section, and the other end of the cylinder section is connected with a socket section; the bellmouth sealing section is connected with the bellmouth pushing section. According to the use requirement and the manufacturing process of the internal-acting micro jacking pipe, the wall thickness of the pipe body is increased by reducing the inner diameter of a small section of the socket section and the small section of the socket section, so that the requirement of transmitting jacking force is met, and the compression stress of the socket section is reduced by a large amount by thickening the tail ends of the socket section and the socket section; the jacking pipe is produced by adopting an integral casting mode; and a flange and a reinforcing rib are not required to be additionally arranged, so that the material consumption and the bonding workload of the jacking pipe are reduced, the production cost is reduced, and the production efficiency is improved. The invention increases the wall thickness of the pipe body by reducing the inner diameters of a small section of the socket section and the socket section to meet the requirement of transmitting the jacking force, adopts the integral casting mode for production, reduces the weight and the manufacturing difficulty, and is applied to the technical field of trenchless construction of water delivery engineering.

Description

Internal-acting type nodular cast iron jacking pipe for whole trenchless pipeline construction
Technical Field
The invention relates to a nodular cast iron jacking pipe for construction of an internal-acting integral trenchless pipeline in the technical field of trenchless construction of water delivery engineering.
Background
With the development of society, the demand for improving the livelihood is more and more, wherein a pipeline water delivery project occupies a large proportion. The nodular cast iron pipe is widely applied due to the advantage of high cost performance. In a relatively open space, the ductile cast iron pipeline is generally constructed in an excavation direct-burial mode, but in a relatively crowded city or special areas such as river-crossing roads and the like, excavation direct-burial cannot be realized, and the construction is carried out in a non-excavation underground pipe-jacking mode.
At present, the nodular cast iron jacking pipes adopted in the market are all cast or welded with a jacking flange on the excircle of a socket due to process limitation, and necessary reinforcing ribs are arranged behind the flange to ensure the requirement of jacking force. Particularly in construction areas with small space, relatively short microthrubes must be used. The cost of the flange is converted to the short pipe, and the cost is doubled, so that the high cost is hard to bear by the owner. This has just restricted the popularization and the application of little push pipe greatly.
Patent No. 201821219184.0 discloses a nodular cast iron T type interface underground pipe of negative pressure sand box, what this patent adopted is that ordinary nodular cast iron block casting T type interface underground pipe, the bell and spigot internal diameter is great, can not satisfy the requirement of transmission jacking force, the mode transmission jacking force that only can lean on additional flange and strengthening rib, it belongs to the external action formula pipe jacking structure that is an additional top pushing flange, weight is heavier, the preparation degree of difficulty is big, low in production efficiency, the manufacturing cost height of pipe jacking.
Therefore, it is a new problem to be solved urgently to develop a nodular cast iron jacking pipe for internal-acting type integral trenchless pipeline construction.
Disclosure of Invention
The invention aims to provide a nodular cast iron jacking pipe for internal-acting type integral trenchless pipeline construction, which meets the requirement of transmitting jacking force by reducing the inner diameter of a small section of a bell and spigot and increasing the wall thickness of the pipe body according to the use requirement and the manufacturing process of the internal-acting type micro jacking pipe, is produced by adopting an integral casting mode, has the weight reduced by 30 percent compared with the external-acting type jacking pipe with an external jacking flange, reduces the manufacturing difficulty by 50 percent and improves the production efficiency by 50 percent. The production cost of the jacking pipe is reduced.
The purpose of the invention is realized as follows: an internal acting type nodular cast iron jacking pipe for integral trenchless pipeline construction comprises a cylinder section, a socket section and a socket section, wherein one end of the cylinder section is connected with the socket section, and the other end of the cylinder section is connected with the socket section; the bellmouth section consists of a bellmouth sealing section and a bellmouth pushing section, and the bellmouth sealing section is connected with the bellmouth pushing section;
the working principle of the nodular cast iron jacking pipe for the internal-acting type integral trenchless pipeline construction is that according to the use requirement and the manufacturing process of the internal-acting type micro jacking pipe, the wall thickness of the part of the pipe body is increased by reducing the inner diameter of a small section of the socket section and the socket section to meet the requirement of transmitting the jacking force, the jacking force allowed to be borne by the jacking pipe is 2720KN according to the standard requirement of T/CFA 020/0202.4-2017 through DN600 jacking pipe experimental data, the wall thickness of the pipe at the original T-shaped socket end is 10.2mm, and the contact area is 3.14 × (600/2)2×10.2=2882.5mm2When the maximum jacking force is reached, the socket compression stress is 2720KN/28825mm2×10-6=940Pa, the wall thickness of the socket section and the socket section is increased to 23.4mm by increasing the wall thickness of the socket section and the socket section, and the contact area is 3.14 × (600/2)2×23.4=6612.8mm2When the maximum jacking force is reached, the socket compression stress is 2720KN/6612.8mm2×10-6=411 Pa; experimental data prove that the tail ends of the socket section and the socket section are thickened, so that the compressive stress of the socket section is reduced by a large amount; the pipe jacking is produced by adopting an integral casting mode, and a section of pipe body with the length of 50-100mm is directly adhered to the inner diameter of the socket section and the bell section of the model; flanges and reinforcing ribs are not required to be added, so that the material consumption and the bonding workload of the jacking pipe are reduced, the production cost is reduced, and the production efficiency is improved;
the thickening amount of the socket section and the bell section of the nodular cast iron jacking pipe for the internal-acting type integral non-excavation pipeline construction is one time of the thickness of the pipe body, the installation chamfer is removed, and the contact thickness of the socket section and the bell section is one; the thickened length of the socket section is 100 mm; the length of the socket pushing section is 100 mm;
socket section and socket section contact thickness gauge I
Specification of Allowable thrust KN Pipe wall thickness mm Contact wall thickness mm Stress reduction ratio
DN250 920 9 15 60%
DN300 1240 9.6 16.2 59%
DN350 1270 10.2 17.4 59%
DN400 1350 10.8 18.6 58%
DN450 1560 11.4 19.8 58%
DN500 1910 12.0 21.0 57%
DN600 2720 13.2 23.4 56%
DN700 2720 14.4 23.8 60%
DN800 3300 15.6 26.2 60%
DN900 4140 16.8 28.6 59%
DN1000 5080 18.0 31.0 58%
DN1100 6110 19.2 33.4 57%
DN1200 7240 20.4 35.8 57%
DN1400 9020 22.8 38.6 59%
DN1600 12360 25.2 43.4 58%
DN1800 12360 27.6 48.2 57%
DN2000 16970 30.0 53.0 57%
DN2200 16970 32.4 57.8 56%
DN2400 16970 34.8 62.6 56%
DN2600 23340 37.2 67.4 55%
；
The working principle and the using and operating method of the internal-acting type nodular cast iron jacking pipe for the integral non-excavation pipeline construction are that a lost foam forming machine is used for manufacturing a die piece in a segmented mode, and the length of the segment is designed to be 1 meter according to the length specification of a working table surface and a pipe body of the forming machine; by utilizing the characteristics of easy molding and convenient bonding of the lost foam, each segment is superposed to the required length of the top pipe of a user and is randomly selected within the length of 3 meters; the lost foam forming machine is utilized to realize the integral casting of the large-caliber long jacking pipe, so that the equipment investment and the die tooling investment cost are saved; the 'building block type' mould design meets the requirements of different length specifications, different pressure grades and different sizes of socket sections and bellmouth sections; the lost foam is molded in a modular mode, vertical stepped negative pressure pouring is performed, the molding qualified rate and the primary water pressure qualified rate are improved, the molding qualified rate can reach 98 percent, the primary water pressure qualified rate can reach 92 percent, the method is incomparable to other molding means, the production efficiency is high, mass production is realized, and the market demand is met; the negative pressure pouring not only enables the alloy structure to be more compact and is more beneficial to protecting the environment, but also completely recycles waste gas and dust generated in the pouring process, thereby really realizing green and environment-friendly casting; when the internal-acting type nodular cast iron jacking pipe is installed and used, a first spigot section of the internal-acting type nodular cast iron jacking pipe for the whole trenchless pipeline construction is installed and enters a second spigot section, and the like are repeated in the following;
the casting method of the nodular cast iron jacking pipe for the internal-acting integral trenchless pipeline construction comprises the following steps:
(1) firstly, cutting and bonding the length of a pipe body according to the requirement, and then bonding a socket and a socket in sequence;
(2) uniformly brushing refractory paint on the exterior of the bonded casting, and sending the casting into a drying chamber for drying;
(3) bonding the dried lost foam and a pouring channel well and placing the bonded lost foam and the pouring channel in a negative pressure sand box; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(4) filling dry sand, compacting, laminating and vacuumizing; the process of filling dry sand is that the sand is filled and the sand box is compacted, after the sand box is filled, the upper surface is covered with a plastic film for sealing, and the molding sand is compacted by vacuumizing;
(5) injecting the prepared molten iron into a model under negative pressure; pouring under the pressure of-0.5 bar, so that the ductile iron structure is more compact and more environment-friendly;
(6) closing the negative pressure 10 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(7) and performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting that the appearance and the size are qualified.
The key points of the invention are its structure, working principle, operation method and casting method.
Compared with the prior art, the nodular cast iron jacking pipe for the internal-acting integral trenchless pipeline construction has the advantages that the requirement of transmitting jacking force is met by reducing the inner diameter of a small section of the socket section and increasing the wall thickness of the part of the pipe body according to the use requirement and the manufacturing process of the internal-acting micro jacking pipe, the integral casting mode is adopted for production, the weight is reduced, the manufacturing difficulty is reduced, the production efficiency is improved by 50%, the production cost of the jacking pipe is reduced, and the like, and the nodular cast iron jacking pipe can be widely applied to the technical field of trenchless construction of water delivery engineering.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram of two sets of interconnections according to the present invention.
Fig. 3 is an enlarged view of a portion I of fig. 2.
Detailed Description
Referring to the attached drawings, the nodular cast iron jacking pipe for the internal-acting integral trenchless pipeline construction comprises a cylinder section 1, a socket section 2 and a socket section 3, wherein one end of the cylinder section 1 is connected with the socket section 2, and the other end of the cylinder section 1 is connected with the socket section 3; the bellmouth section 3 consists of a bellmouth sealing section 3-1 and a bellmouth pushing section 3-2, and the bellmouth sealing section 3-1 is connected with the bellmouth pushing section 3-2.
The working principle of the nodular cast iron jacking pipe for the internal-acting type integral trenchless pipeline construction is that according to the use requirement and the manufacturing process of the internal-acting type micro jacking pipe, the wall thickness of the pipe body is increased by reducing the inner diameter of a small section of the socket section 2 and the socket section 3 to meet the requirement of transmitting the jacking force, the jacking force allowed to be borne by the jacking pipe is 2720KN according to the T/CFA 020/0202.4-2017 standard requirement on DN600 jacking pipe experimental data, the wall thickness of the pipe at the original T-shaped socket end is 10.2mm, and the contact area is 3.14 × (600/2)2×10.2=2882.5mm2When the maximum jacking force is reached, the socket compression stress is 2720KN/28825mm2×10-6=940Pa, the wall thickness of the socket end reaches 23.4mm by thickening the wall thickness of the socket section 2 and the socket section 3, and the contact area is 3.14 × (600/2)2×23.4=6612.8mm2When the maximum jacking force is reached, the socket compression stress is 2720KN/6612.8mm2×10-6=411 Pa; experimental data demonstrate thatThe tail end of the socket section 3 is thickened, so that the compression stress of the socket section 2 is reduced by a large half; the pipe jacking is produced by adopting an integral casting mode, and a section of pipe body with the length of 50-100mm is directly adhered to the inner diameter of the model socket section 2 and the inner diameter of the bell mouth section 3; and a flange and a reinforcing rib are not required to be additionally arranged, so that the material consumption and the bonding workload of the jacking pipe are reduced, the production cost is reduced, and the production efficiency is improved.
The thickening amount of the socket section 2 and the bell section 3 of the internal-acting type nodular cast iron jacking pipe for the whole trenchless pipeline construction is one time of the thickness of the pipe body, the installation chamfer is removed, and the contact thickness of the socket section 2 and the bell section 3 is measured by one; the thickened length of the socket section 2 is 100 mm; the length of the bellmouth pushing section 3-2 is 100 mm;
socket section 2 and socket section 3 contact thickness meter
Specification of Allowable thrust KN Pipe wall thickness mm Contact wall thickness mm Stress reduction ratio
DN250 920 9 15 60%
DN300 1240 9.6 16.2 59%
DN350 1270 10.2 17.4 59%
DN400 1350 10.8 18.6 58%
DN450 1560 11.4 19.8 58%
DN500 1910 12.0 21.0 57%
DN600 2720 13.2 23.4 56%
DN700 2720 14.4 23.8 60%
DN800 3300 15.6 26.2 60%
DN900 4140 16.8 28.6 59%
DN1000 5080 18.0 31.0 58%
DN1100 6110 19.2 33.4 57%
DN1200 7240 20.4 35.8 57%
DN1400 9020 22.8 38.6 59%
DN1600 12360 25.2 43.4 58%
DN1800 12360 27.6 48.2 57%
DN2000 16970 30.0 53.0 57%
DN2200 16970 32.4 57.8 56%
DN2400 16970 34.8 62.6 56%
DN2600 23340 37.2 67.4 55%
The working principle and the using and operating method of the internal-acting type nodular cast iron jacking pipe for the integral non-excavation pipeline construction are that a lost foam forming machine is used for manufacturing a die piece in a segmented mode, and the length of the segment is designed to be 1 meter according to the length specification of a working table surface and a pipe body of the forming machine; by utilizing the characteristics of easy molding and convenient bonding of the lost foam, each segment is superposed to the required length of the top pipe of a user and is randomly selected within the length of 3 meters; the lost foam forming machine is utilized to realize the integral casting of the large-caliber long jacking pipe, so that the equipment investment and the die tooling investment cost are saved; the 'building block type' mould design meets the requirements of different length specifications, different pressure grades and different sizes of the socket section 2 and the bellmouth section 3; the lost foam is molded in a modular mode, vertical stepped negative pressure pouring is performed, the molding qualified rate and the primary water pressure qualified rate are improved, the molding qualified rate can reach 98 percent, the primary water pressure qualified rate can reach 92 percent, the method is incomparable to other molding means, the production efficiency is high, mass production is realized, and the market demand is met; the negative pressure pouring not only enables the alloy structure to be more compact and is more beneficial to protecting the environment, but also completely recycles waste gas and dust generated in the pouring process, thereby really realizing green and environment-friendly casting; when the pipe is installed and used, the first socket section 2 of the nodular cast iron jacking pipe for the internal-acting type integral trenchless pipeline construction is installed and enters the second socket section 3, and the like.
5. The internal-acting nodular cast iron jacking pipe for the integral trenchless pipeline construction according to claim 1, wherein: the casting method of the nodular cast iron jacking pipe for the internal-acting integral trenchless pipeline construction comprises the following steps:
(1) firstly, cutting and bonding the length of a pipe body according to the requirement, and then bonding a socket and a socket in sequence;
(2) uniformly brushing refractory paint on the exterior of the bonded casting, and sending the casting into a drying chamber for drying;
(3) bonding the dried lost foam and a pouring channel well and placing the bonded lost foam and the pouring channel in a negative pressure sand box; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(4) filling dry sand, compacting, laminating and vacuumizing; the process of filling dry sand is that the sand is filled and the sand box is compacted, after the sand box is filled, the upper surface is covered with a plastic film for sealing, and the molding sand is compacted by vacuumizing;
(5) injecting the prepared molten iron into a model under negative pressure; pouring under the pressure of-0.5 bar, so that the ductile iron structure is more compact and more environment-friendly;
(6) closing the negative pressure 10 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(7) and performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting that the appearance and the size are qualified.
Example one
The method for casting the nodular cast iron jacking pipe with the length of 3 meters and the internal action type integral trenchless pipeline construction comprises the following steps:
(1) firstly, cutting and bonding a pipe body according to the requirement, wherein the length of the pipe body is 3 meters, and then bonding a DN1200 socket and a DN1200 bell mouth in sequence;
(2) uniformly brushing refractory paint on the exterior of the bonded casting, and sending the casting into a drying chamber for drying;
(3) bonding the dried lost foam and a pouring channel well and placing the bonded lost foam and the pouring channel in a negative pressure sand box; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(4) filling dry sand, compacting, laminating and vacuumizing; the process of filling dry sand is that the sand is filled and the sand box is compacted, after the sand box is filled, the upper surface is covered with a plastic film for sealing, and the molding sand is compacted by vacuumizing;
(5) injecting the prepared molten iron into a model under negative pressure; pouring under the pressure of-0.5 bar, so that the ductile iron structure is more compact and more environment-friendly;
(6) closing the negative pressure 10 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(7) and performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting that the appearance and the size are qualified.
Example two
The method for casting the nodular cast iron jacking pipe for the integral non-excavation pipeline construction with DN1400 and the length of 3 meters comprises the following steps:
(1) firstly, cutting and bonding a pipe body according to the requirement, wherein the length of the pipe body is 3 meters, and then bonding a DN1400 socket and a DN1400 socket in sequence;
(2) uniformly brushing refractory paint on the exterior of the bonded casting, and sending the casting into a drying chamber for drying;
(3) bonding the dried lost foam and a pouring channel well and placing the bonded lost foam and the pouring channel in a negative pressure sand box; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(4) filling dry sand, compacting, laminating and vacuumizing; the process of filling dry sand is that the sand is filled and the sand box is compacted, after the sand box is filled, the upper surface is covered with a plastic film for sealing, and the molding sand is compacted by vacuumizing;
(5) injecting the prepared molten iron into a model under negative pressure; pouring under the pressure of-0.5 bar, so that the ductile iron structure is more compact and more environment-friendly;
(6) closing the negative pressure 10 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(7) and performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting that the appearance and the size are qualified.
H in fig. 3 indicates the contact thickness of the socket section 2 and the socket section 3.

Claims (5)

1. The utility model provides a whole non-excavation pipeline construction of internal reaction formula is with nodular cast iron push pipe, includes barrel section, socket section, its characterized in that: one end of the cylinder section is connected with the socket section, and the other end of the cylinder section is connected with the socket section; the bellmouth section consists of a bellmouth sealing section and a bellmouth pushing section, and the bellmouth sealing section is connected with the bellmouth pushing section.
2. The internal-acting nodular cast iron jacking pipe for the integral trenchless pipeline construction according to claim 1, wherein: the working principle of the internal-acting type nodular cast iron jacking pipe for the whole trenchless pipeline construction is as follows: according to the use requirement and the manufacturing process of the internal acting type micro jacking pipe, the wall thickness of the pipe body of the part is increased by reducing the inner diameters of a small section of the socket section and the socket section, so that the requirement of transmitting jacking force is met; through DN600 jacking pipe experimental data, according to the standard requirement of T/CFA 020/0202.4-2017, jacking pipe allows bearingThe thrust is 2720KN, the wall thickness of the original T-shaped socket end pipe is 10.2mm, and the contact area is 3.14 × (600/2)2×10.2=2882.5mm2When the maximum jacking force is reached, the socket compression stress is 2720KN/28825mm2×10-6=940Pa, the wall thickness of the socket section and the socket section is increased to 23.4mm by increasing the wall thickness of the socket section and the socket section, and the contact area is 3.14 × (600/2)2×23.4=6612.8mm2When the maximum jacking force is reached, the socket compression stress is 2720KN/6612.8mm2×10-6=411 Pa; experimental data prove that the tail ends of the socket section and the socket section are thickened, so that the compressive stress of the socket section is reduced by a large amount; the pipe jacking is produced by adopting an integral casting mode, and a section of pipe body with the length of 50-100mm is directly adhered to the inner diameter of the socket section and the bell section of the model; and a flange and a reinforcing rib are not required to be additionally arranged, so that the material consumption and the bonding workload of the jacking pipe are reduced, the production cost is reduced, and the production efficiency is improved.
3. The internal-acting nodular cast iron jacking pipe for the integral trenchless pipeline construction according to claim 1, wherein: the thickening amount of the socket section and the bell section of the nodular cast iron jacking pipe for the internal-acting type integral non-excavation pipeline construction is one time of the thickness of the pipe body, the installation chamfer is removed, and the contact thickness of the socket section and the bell section is one; the thickened length of the socket section is 100 mm; the length of the socket pushing section is 100 mm;
socket section and socket section contact thickness gauge I
Specification of Allowable thrust KN Pipe wall thickness mm Contact wall thickness mm Stress reduction ratio DN250 920 9 15 60% DN300 1240 9.6 16.2 59% DN350 1270 10.2 17.4 59% DN400 1350 10.8 18.6 58% DN450 1560 11.4 19.8 58% DN500 1910 12.0 21.0 57% DN600 2720 13.2 23.4 56% DN700 2720 14.4 23.8 60% DN800 3300 15.6 26.2 60% DN900 4140 16.8 28.6 59% DN1000 5080 18.0 31.0 58% DN1100 6110 19.2 33.4 57% DN1200 7240 20.4 35.8 57% DN1400 9020 22.8 38.6 59% DN1600 12360 25.2 43.4 58% DN1800 12360 27.6 48.2 57% DN2000 16970 30.0 53.0 57% DN2200 16970 32.4 57.8 56% DN2400 16970 34.8 62.6 56% DN2600 23340 37.2 67.4 55%
。
4. The internal-acting nodular cast iron jacking pipe for the integral trenchless pipeline construction according to claim 1, wherein: the working principle and the using and operating method of the internal-acting type nodular cast iron jacking pipe for the integral non-excavation pipeline construction are that a lost foam forming machine is used for manufacturing a die piece in a segmented mode, and the length of the segment is designed to be 1 meter according to the length specification of a working table surface and a pipe body of the forming machine; by utilizing the characteristics of easy molding and convenient bonding of the lost foam, each segment is superposed to the required length of the top pipe of a user and is randomly selected within the length of 3 meters; the lost foam forming machine is utilized to realize the integral casting of the large-caliber long jacking pipe, so that the equipment investment and the die tooling investment cost are saved; the 'building block type' mould design meets the requirements of different length specifications, different pressure grades and different sizes of socket sections and bellmouth sections; the lost foam is molded in a modular mode, vertical stepped negative pressure pouring is performed, the molding qualified rate and the primary water pressure qualified rate are improved, the molding qualified rate can reach 98 percent, the primary water pressure qualified rate can reach 92 percent, the method is incomparable to other molding means, the production efficiency is high, mass production is realized, and the market demand is met; the negative pressure pouring not only enables the alloy structure to be more compact and is more beneficial to protecting the environment, but also completely recycles waste gas and dust generated in the pouring process, thereby really realizing green and environment-friendly casting; when the installation is used, the first spigot section of the internal-acting type nodular cast iron jacking pipe for the whole trenchless pipeline construction is installed and enters the second spigot section, and the like in the following.
5. The internal-acting nodular cast iron jacking pipe for the integral trenchless pipeline construction according to claim 1, wherein: the casting method of the nodular cast iron jacking pipe for the internal-acting integral trenchless pipeline construction comprises the following steps:
(1) firstly, cutting and bonding the length of a pipe body according to the requirement, and then bonding a socket and a socket in sequence;
(2) uniformly brushing refractory paint on the exterior of the bonded casting, and sending the casting into a drying chamber for drying;
(3) bonding the dried lost foam and a pouring channel well and placing the bonded lost foam and the pouring channel in a negative pressure sand box; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(4) filling dry sand, compacting, laminating and vacuumizing; the process of filling dry sand is that the sand is filled and the sand box is compacted, after the sand box is filled, the upper surface is covered with a plastic film for sealing, and the molding sand is compacted by vacuumizing;
(5) injecting the prepared molten iron into a model under negative pressure; pouring under the pressure of-0.5 bar, so that the ductile iron structure is more compact and more environment-friendly;
(6) closing the negative pressure 10 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(7) and performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting that the appearance and the size are qualified.
CN202010446546.5A 2020-05-25 2020-05-25 Internal-acting type nodular cast iron jacking pipe for whole trenchless pipeline construction Pending CN111637277A (en)

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CN115059807A (en) * 2022-06-30 2022-09-16 安钢集团永通球墨铸铁管有限责任公司 Short-length micro jacking pipe and manufacturing process thereof
CN115199833A (en) * 2022-07-29 2022-10-18 德庆奥新宇联合管道有限公司 Pipe for long-distance natural gas pipeline, preparation process and installation method of long-distance natural gas pipeline

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CN2746235Y (en) * 2004-08-27 2005-12-14 黄博 Female end and socket rolling suspension processed reinforced concrete pipe
CN201836547U (en) * 2010-03-10 2011-05-18 湖南振辉管业有限公司 Socket-enhanced composite plastic pipe
CN101929587A (en) * 2010-06-21 2010-12-29 新兴铸管股份有限公司 Heavy-calibre circlip self-rivet connecting ductile cast iron pipe
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CN208185639U (en) * 2018-04-20 2018-12-04 广东北晟益通实业有限公司 Heating pipeline ductile iron pipe
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115059807A (en) * 2022-06-30 2022-09-16 安钢集团永通球墨铸铁管有限责任公司 Short-length micro jacking pipe and manufacturing process thereof
CN115059807B (en) * 2022-06-30 2024-02-13 安钢集团永通球墨铸铁管有限责任公司 Short-length micro-jacking pipe and manufacturing process thereof
CN115199833A (en) * 2022-07-29 2022-10-18 德庆奥新宇联合管道有限公司 Pipe for long-distance natural gas pipeline, preparation process and installation method of long-distance natural gas pipeline

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Application publication date: 20200908