A method for non-excavation expansion construction of municipal pipeline

Abstract

The application provides a kind of municipal pipeline trenchless expansion construction method, which comprises the following steps: S1, excavating a first working well and a second working well on an old short pipe; S2, installing a push-pull device in the first working well and connecting it to a guide rod; S3, cutting the entire old short pipe into multiple sections of old short pipe; S4, removing the cutting device and installing a pushing device on the guide rod; S5, installing a hollow jacking machine on one side of the inner wall of the second working well and a hydraulic jack on the other side of the inner wall; S6, hoisting a first section of steel new pipe into the second working well; S7, pushing the first section of old short pipe out of the hollow jacking machine into the second working well and hoisting it out; the first section of steel new pipe is jacked into the cavity where the hoisted-out first section of old short pipe is located through the hollow jacking machine; S8, hoisting a second section of steel new pipe and repeating the operations in steps S6 to S7 until all old short pipes are replaced by steel new pipes. The method is simple to operate and has good use effect, saving time and effort.

Description

Technical Field

[0001] This application relates to the field of construction, and more particularly to a trenchless expansion construction method for municipal pipelines. Background Technology

[0002] Most municipal drainage pipes are buried underground along with the construction of municipal roads. With urban development and the improvement of standards, after a certain period of use, the flow capacity of the pipes can hardly meet the drainage needs of the surrounding areas. Therefore, it is necessary to expand and upgrade the municipal pipes. Moreover, with the continuous improvement of existing roads, the number of newly built municipal roads will inevitably decrease, while the number of renovation projects will increase. Therefore, the demand for expanding and upgrading the existing drainage pipes is becoming stronger.

[0003] Trenchless technology, as an advanced construction technology with minimal impact on surrounding traffic, environment, and buildings and good economic and social benefits, has become quite mature. However, there is still a lack of effective technical means to upgrade and expand existing municipal pipelines without trenching. Pipe bursting construction technology, which has a certain capacity for expansion, has disadvantages such as easy bulging of the construction road, easy compression of adjacent pipelines, limited range of pipe diameter expansion, and easy scratches on the outer wall of the new pipe. Summary of the Invention

[0004] One of the purposes of this application is to provide a trenchless expansion construction method for municipal pipelines to solve the problem of poor performance of existing trenchless technologies for municipal drainage pipelines.

[0005] The technical solution of this application is:

[0006] A method for trenchless expansion of municipal pipelines includes the following steps:

[0007] S1, the old short pipe to be replaced is dredged, blocked and diverted in sequence by the blocking and diversion equipment, and the first working well and the second working well are excavated at intervals on the old short pipe to be replaced;

[0008] S2, a push-pull device is installed in the first working well, and the drive end of the push-pull device is connected to a guide rod with adjustable length to drive the guide rod to move back and forth in the old short pipe; a monitoring device, a walking device, and a cutting device are installed sequentially and at intervals on the end of the guide rod near the second working well. The monitoring device is used to monitor the situation inside the old short pipe, the walking device can walk on the inner wall of the old short pipe, and the cutting device is telescopically installed in the old short pipe for cutting the old short pipe.

[0009] S3, start the push-pull device and push the guide rod forward toward the second working well, and start cutting the old short pipe through the cutting device, and cut the entire old short pipe into multiple old short pipe sections;

[0010] S4. After the entire old short pipe is cut, the cutting equipment is removed, and a pushing device is installed on the guide rod to push the old short pipe from the first working well to the second working well.

[0011] S5, a hollow pipe jacking machine is installed on the inner wall of the second working well near the guide rod, and a hydraulic jack is installed on the inner wall of the other side;

[0012] S6, start the hydraulic jack and the hollow pipe jacking machine. The hollow pipe jacking machine cuts the soil around the first section of the old short pipe and pushes it forward continuously so that the first section of the old short pipe enters the hollow channel inside the hollow pipe jacking machine. After the first section of the old short pipe enters the hollow channel, start the push-pull device. The push-pull device pushes the guide rod and the pushing device, and pushes the first section of the old short pipe out of the hollow pipe jacking machine into the second working well and lifts it out.

[0013] S7, hoist the first section of new steel pipe into the second working well, and connect both ends of the first section of new steel pipe to the hollow pipe jacking machine and the hydraulic jack respectively; start the hydraulic jack and the hollow pipe jacking machine, the first section of new steel pipe and the hollow pipe jacking machine advance forward under the action of the hydraulic jack, and while the hollow pipe jacking machine advances forward, it also cuts the soil around the second section of old short pipe so that the second section of old short pipe enters the hollow channel inside the hollow pipe jacking machine, and the first section of new steel pipe advances to the position where it was before the hollow pipe jacking machine;

[0014] S8, after the second section of the old short pipe enters the hollow channel, the push-pull device is activated, the guide rod and the pushing device are pushed forward by the push-pull device, and the second section of the old short pipe is pushed out from the hollow pipe jacking machine onto the ball bearing guide rail in the new steel pipe, and the second section of the old short pipe is driven to be pushed out along the ball bearing guide rail into the second working well and lifted out;

[0015] S9, hoist in the second section of the new steel pipe, and repeat the operations in steps S7 to S8 until all the old short pipes are replaced with all the new steel pipes; a grouting hole is opened on one of the three sections of the new steel pipe, and a thixotropic mud drag reduction device connected to the grouting hole is installed on the top of the first working well, the thixotropic mud drag reduction device is started and thixotropic mud is injected into the grouting hole;

[0016] S10, dismantle and recycle the push-pull equipment, the hollow pipe jacking machine, the ball bearing guide rail, and the thixotropic mud drag reduction equipment, and clean the inside of the new steel pipe.

[0017] As a technical solution of this application, in step S10, if the diameter of the new steel pipe is the diameter required for municipal pipeline construction, after all the demolition and cleaning work is completed, the push-pull device is reinstalled in the first working well, and a spraying trolley is installed on the guide rod. The spraying trolley is movably installed on the inner wall of the new steel pipe. The push-pull device is started, and the guide rod is driven to move the spraying trolley on the inner wall of the new steel pipe, and an anti-corrosion lining is sprayed onto the inner wall of the new steel pipe.

[0018] As a technical solution of this application, in step S10, if the diameter of the new steel pipe is larger than the diameter required for the municipal pipeline construction, after all the demolition and cleaning work is completed, an arc-shaped cement gasket is pushed into the new steel pipe so that the arc-shaped cement gasket fits against the inner wall of the bottom of the new steel pipe; an inner liner pipe with the required diameter for the municipal pipeline construction is hoisted in and pushed into the cavity formed by the arc-shaped cement gasket and the new steel pipe; the gap between the top of the new steel pipe and both ends of the inner liner pipe is sealed, and the gap is filled with grout to make it dense.

[0019] As a technical solution of this application, in step S1, the sealing and diversion device includes a sealing airbag, a diversion pump, a suction pipe, and a pressure pipe; the first and last ends of the adjacent old short pipes are sealed with the sealing airbags, and the diversion pump is installed between the tops of two inspection wells corresponding to the two ends of the old short pipes; one end of the suction pipe is connected to one side of the diversion pump, and the other end extends into one of the inspection wells; one end of the pressure pipe is connected to the other side of the diversion pump, and the other end extends into the other inspection well.

[0020] As a technical solution of this application, in step S2, the push-pull device includes a hydraulic cylinder, two support frames, and a support crossbar; the two support frames are detachably installed on opposite inner walls of the first working well and are respectively connected to the ends of adjacent old short pipes; the support crossbar is horizontally arranged, with one end detachably connected to the support frame and the other end detachably connected to one end of the hydraulic cylinder; the other end of the hydraulic cylinder is drively connected to one end of the guide rod, for driving the guide rod to move back and forth in the inner cavity of the old short pipe.

[0021] As one technical solution of this application, in step S2, the guide rod is formed by sequentially threading together multiple hollow short rods.

[0022] As one technical solution of this application, in step S2, the monitoring device includes a connecting spindle, a first camera and a second camera; one end of the connecting spindle is fixedly sleeved on the guide rod, and the first camera and the second camera are respectively installed on opposite sides of the other end.

[0023] As a technical solution of this application, in step S2, the walking device includes a positioning cylinder, two rows of positioning frames, and multiple rollers; the positioning cylinder is fixedly sleeved on the guide rod; the two rows of positioning frames are installed parallel and spaced apart on the positioning cylinder, and each row of positioning frames includes multiple telescopic rods with the same spacing; one end of the multiple telescopic rods is connected to the positioning cylinder along the circumference of the positioning cylinder, and the other end is connected to the rotatable rollers; the multiple rollers are arranged on the inner wall of the old short pipe in a forward and backward movement manner.

[0024] As one technical solution of this application, in step S2, the cutting device includes an annular rotating cylinder, multiple telescopic supports, and multiple cutting machines; the inner wall of the annular rotating cylinder is fixedly sleeved on the guide rod, and the outer wall is rotatably sleeved on the inner wall of the annular rotating cylinder; one end of the multiple telescopic supports is fixedly connected to the outer wall of the annular rotating cylinder at intervals along the circumference of the annular rotating cylinder, and the other end is telescopically connected to the cutting machine; the cutting machine is movably installed inside the old short pipe along the inner circumferential wall of the old short pipe, and is used to cut the old short pipe into multiple sections of the old short pipe.

[0025] As a technical solution of this application, in step S4, the pushing device includes a connecting cylinder, a plurality of telescopic connecting rods and a plurality of pushers; the connecting cylinder is fixedly sleeved on the guide rod; one end of the plurality of telescopic connecting rods is connected to the outer wall of the connecting cylinder along the circumference of the connecting cylinder, and the other end is connected to the pusher; the plurality of pushers are used to push the old short pipe through the hollow pipe jacking machine to remove the new steel pipe.

[0026] As one technical solution of this application, in step S8, the ball bearing guide rail includes an arc-shaped steel plate, two steel guide rails, and two rows of steel balls; the arc-shaped steel plate is attached to the bottom inner wall of the new steel pipe; the two steel guide rails are respectively installed on both sides of the arc-shaped steel plate along the length direction of the arc-shaped steel plate; each row of steel balls is intermittently embedded in the corresponding groove on the top surface of the steel guide rail.

[0027] As a technical solution of this application, in step S9, the thixotropic mud drag reduction device includes a thixotropic mud truck, a grouting main pipe, a grouting ring pipe, and grouting short pipes; the top end of the grouting main pipe is connected to the thixotropic mud truck, and the bottom end passes through the steel new pipe and is connected to the grouting pipe in the hollow pipe jacking machine; the steel new pipe has multiple grouting holes distributed circumferentially; the grouting main pipe is connected to multiple parallel grouting ring pipes at intervals along its length, and each grouting ring pipe is connected to multiple grouting short pipes at intervals along its circumferential direction; each grouting short pipe is connected to each grouting hole in a one-to-one correspondence.

[0028] As one technical solution of this application, the spraying trolley includes a positioning main cylinder, multiple telescopic shafts, multiple rolling wheels, and a spray head; the positioning main cylinder is sleeved on the guide rod and is hollow inside for the spraying material to pass through; one end of the side wall of the positioning main cylinder is connected to the feed pipe, and the other end is connected to the spray head, which is used to spray anti-corrosion coating onto the inner wall of the new steel pipe; one end of the multiple telescopic shafts is connected to the positioning main cylinder along the circumference of the positioning main cylinder, and the other end is connected to the rotatable rolling wheels; the rolling wheels are movably arranged on the inner wall of the new steel pipe.

[0029] The beneficial effects of this application are:

[0030] The trenchless expansion method for municipal pipelines disclosed in this application enables in-situ upgrades of existing pipelines without excavation, and allows for optional pipe diameter expansion as needed, while minimizing impact on surrounding traffic, the environment, and other pipelines. Furthermore, it allows for the replacement of existing pipelines without excavation, avoiding large-scale damage to existing roads and the surrounding environment, and minimizing impact on existing traffic conditions, resulting in good socio-economic benefits. In addition, the method incorporates construction diversion during the construction process, ensuring the normal operation of drainage pipelines during construction and avoiding disruption to the drainage needs of surrounding residents and businesses. Moreover, the method does not cause ground uplift during operation, has minimal impact on surrounding underground pipelines and structures, offers high safety, and provides good socio-economic benefits. Simultaneously, the method boasts a high degree of mechanization and automation, is applicable to a wide range of pipe diameters, and has strong expansion capabilities, enabling the expansion and replacement of existing pipelines with equivalent diameters. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 A schematic diagram illustrating the sealing, diversion, and excavation status of an old short pipe provided in an embodiment of this application;

[0033] Figure 2 A schematic diagram illustrating the installation of the push-pull device and the cutting of the old short pipe, provided in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the cutting state of an old short pipe provided in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the first state of jacking up a new steel pipe, provided in an embodiment of this application.

[0036] Figure 5 This is a schematic diagram of the second state of jacking up a new steel pipe, provided in an embodiment of this application.

[0037] Figure 6 This is a schematic diagram of the first state of the old short pipe transportation process provided in an embodiment of this application;

[0038] Figure 7 This is a schematic diagram of the second state of the old short pipe transportation process provided in an embodiment of this application;

[0039] Figure 8 This is a schematic diagram of the third state of jacking up a new steel pipe, provided in an embodiment of this application.

[0040] Figure 9 A schematic diagram illustrating the flushing process of a new steel pipe, provided as an embodiment of this application;

[0041] Figure 10 A schematic diagram illustrating the spraying process of a new steel pipe, as provided in an embodiment of this application.

[0042] Figure 11 This is a schematic diagram of the installation of the arc-shaped cement pad provided in the embodiments of this application;

[0043] Figure 12 This is a schematic diagram of the installation of the inner liner tube provided in an embodiment of this application;

[0044] Figure 13 A schematic diagram illustrating the grouting process between the inner lining pipe and the new steel pipe, provided as an embodiment of this application.

[0045] Figure 14 A schematic diagram of a push-pull device provided in an embodiment of this application;

[0046] Figure 15 A schematic diagram of the guide rod provided in an embodiment of this application;

[0047] Figure 16 A schematic diagram of the walking device provided in the embodiments of this application;

[0048] Figure 17 This is a schematic diagram of the first angle of the walking device provided in an embodiment of this application;

[0049] Figure 18 A schematic diagram of the cutting equipment provided in the embodiments of this application;

[0050] Figure 19 This is a schematic diagram of the first angle of the cutting device provided in an embodiment of this application;

[0051] Figure 20 A schematic diagram of the pushing device provided in the embodiments of this application;

[0052] Figure 21 This is a schematic diagram of the first angle of the pushing device provided in an embodiment of this application;

[0053] Figure 22 This is a schematic diagram of a hollow tube jacking machine provided in an embodiment of this application;

[0054] Figure 23 This is a schematic diagram of a ball guide provided in an embodiment of this application;

[0055] Figure 24 This is a schematic diagram of the first angle of the ball guide provided in an embodiment of this application;

[0056] Figure 25 This is a schematic diagram of a thixotropic mud drag reduction device provided in an embodiment of this application;

[0057] Figure 26 This is a schematic diagram of a painting cart provided in an embodiment of this application;

[0058] Figure 27 This is a schematic diagram of the first angle of the painting cart provided in an embodiment of this application;

[0059] Figure 28 This is a schematic diagram of an arc-shaped cement pad provided in an embodiment of this application.

[0060] Icons: 1-First working shaft; 2-Second working shaft; 3-Old short pipe; 4-Push-pull equipment; 5-Guide rod; 6-Monitoring equipment; 7-Traveling equipment; 8-Cutting equipment; 9-Pushing equipment; 10-Hollow pipe jacking machine; 11-Hydraulic jack; 12-New steel pipe; 13-Ball bearing guide rail; 15-Thixotropic mud drag reduction equipment; 16-Spraying trolley; 17-Arc-shaped cement pad; 18-Inner lining pipe; 19-Sealing airbag; 20-Diverter pump; 21-Suction pipe; 22-Pressure water pipe; 23-Inspection well ; 24-Hydraulic cylinder; 25-Support frame; 26-Support crossbar; 27-Positioning cylinder; 28-Positioning frame; 29-Roller; 30-Annular rotating cylinder; 31-Telescopic bracket; 32-Cut machine; 33-Connecting cylinder; 34-Telescopic connecting rod; 35-Push knife; 36-Arc-shaped steel plate; 37-Steel guide rail; 38-Steel ball; 39-Thixotropic mud cart; 40-Grouting main pipe; 41-Grouting ring pipe; 42-Grouting short pipe; 43-Positioning main cylinder; 44-Telescopic shaft; 45-Roller; 46-Nozzle. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0062] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0063] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0064] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only used to facilitate the description of this application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0065] Furthermore, in this application, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Moreover, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0067] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0068] Example:

[0069] Please refer to Figure 1 (Refer to) Figures 2 to 28 This application provides a trenchless expansion construction method for municipal pipelines, comprising the following steps:

[0070] S1, the old short pipe 3 to be replaced is dredged, blocked and diverted in sequence by the blocking and diversion equipment, and the first working well 1 and the second working well 2 are excavated at intervals on the old short pipe 3 to be replaced.

[0071] S2, a push-pull device 4 is installed in the first working well 1, and the drive end of the push-pull device 4 is connected to a guide rod 5 with adjustable length to drive the guide rod 5 to move back and forth in the old short pipe 3; a monitoring device 6, a walking device 7 and a cutting device 8 are installed sequentially and at intervals on the end of the guide rod 5 near the second working well 2. The monitoring device 6 is used to monitor the situation inside the old short pipe 3, the walking device 7 is movably installed on the inner wall of the old short pipe 3, and the cutting device 8 is telescopically set in the old short pipe 3 for cutting the old short pipe 3.

[0072] S3, the push-pull device 4 is activated and the guide rod 5 is pushed forward toward the second working well 2, and the old short pipe 3 is cut by the cutting device 8, and the entire old short pipe 3 is cut into multiple sections of old short pipe 3; the push-pull device 4 pushes the guide rod 5 forward toward the direction closer to the second working well 2, and the traveling device 7 is used to keep the guide rod 5 in a horizontal state during the movement of the old short pipe 3; every time the guide rod 5 moves forward a certain distance, it will drive the cutting device 8 to start cutting the old short pipe 3, cutting the entire old short pipe 3 into several sections of old short pipe 3 of a certain length. At the same time, the forward distance of the guide rod 5 can be judged by the monitoring device 6, and the cutting position of the cutting device 8 is selected as much as possible at the interface of the original pipe section;

[0073] S4. After the entire old short pipe 3 is cut, remove the cutting equipment 8 and install the pushing device 9 on the guide rod 5 to push the old short pipe 3 from the first working well 1 to the second working well 2.

[0074] S5, a hollow pipe jacking machine 10 is installed on the inner wall of the second working well 2 near the guide rod 5, and a hydraulic jack 11 is installed on the inner wall of the other side;

[0075] S6, start the hydraulic jack 11 and the hollow pipe jacking machine 10. Under the push of the hydraulic jack 11, the hollow pipe jacking machine 10 cuts the soil around the first section of old short pipe 3 and pushes it forward continuously. The old short pipe 3 enters the hollow channel inside the hollow pipe jacking machine 10. Each time the old short pipe 3 is jacked, the distance is one section. At the same time, the hollow pipe jacking machine 10 discharges soil and debris through the mud and water circulation equipment. After the first section of old short pipe 3 enters the hollow channel, start the push-pull device 4. The push-pull device 4 pushes the guide rod 5 and the push device 9, and pushes the first section of old short pipe 3 out of the hollow pipe jacking machine 10 into the second working shaft 2 and lifts it out.

[0076] S7, hoist the first section of new steel pipe 12 into the second working well 2, and connect both ends of the first section of new steel pipe 12 to the hollow pipe jacking machine 10 and the hydraulic jack 11 respectively; start the hydraulic jack 11 and the hollow pipe jacking machine 10, the first section of new steel pipe 12 and the hollow pipe jacking machine 10 advance forward under the action of the hydraulic jack 11, and while the hollow pipe jacking machine 10 advances forward, it also cuts the soil around the second section of old short pipe 3 so that the second section of old short pipe 3 enters the hollow channel inside the hollow pipe jacking machine 10, and the first section of new steel pipe 12 advances to the position where the hollow pipe jacking machine 10 was before;

[0077] S8, after the second section of old short pipe 3 enters the hollow channel, the push-pull device 4 is activated, the guide rod 5 and the push device 9 are pushed through the push-pull device 4, and the second section of old short pipe 3 is pushed out from the hollow pipe jacking machine 10 onto the ball guide rail 13 in the steel new pipe 12, and the second section of old short pipe 3 is driven to be pushed out along the ball guide rail 13 into the second working well 2 and lifted out;

[0078] S9, hoist in the second section of new steel pipe 12, and repeat the operations in steps S7 to S8 until all the old short pipes 3 are replaced with all the new steel pipes 12; a grouting hole is opened on one of the three sections of new steel pipe 12, and a thixotropic mud drag reduction device 15 connected to the grouting hole is installed on the top of the first working well 1. Start the thixotropic mud drag reduction device 15 and inject thixotropic mud into the grouting hole to reduce the frictional resistance between the new steel pipe 12 and the outer wall soil;

[0079] S10, dismantle and recycle the push-pull equipment 4, the hollow pipe jacking machine 10, the ball bearing guide rail 13, and the thixotropic mud drag reduction equipment 15, and use a high-pressure water gun to clean the inside of the new steel pipe 12.

[0080] Further, in step S10, if the diameter of the new steel pipe 12 is the diameter required for municipal pipeline construction, after all the demolition and cleaning work is completed, the push-pull device 4 is reinstalled in the first working well 1, and the spraying trolley 16 is installed on the guide rod 5. The spraying trolley 16 is mounted on the inner wall of the new steel pipe 12 in a movable manner. The push-pull device 4 is started, and the guide rod 5 is driven to move the spraying trolley 16 on the inner wall of the new steel pipe 12, and the inner wall of the new steel pipe 12 is sprayed with anti-corrosion lining. The spraying trolley 16 is used to re-spray the inner wall of the new steel pipe 12 with anti-corrosion lining to repair the damage to the anti-corrosion lining of the new pipe caused by the aforementioned process. After the spraying is completed, the spraying trolley 16 and the push-pull device 4 are recycled.

[0081] Furthermore, in step S10, if the diameter of the new steel pipe 12 is larger than the diameter required for the municipal pipeline construction, after all the demolition and cleaning work is completed, the arc-shaped cement gasket 17 is pushed into the new steel pipe 12 so that the arc-shaped cement gasket 17 fits against the inner wall of the bottom of the new steel pipe 12; the inner liner pipe 18 with the required diameter for the municipal pipeline construction is hoisted in and pushed into the cavity formed by the arc-shaped cement gasket 17 and the new steel pipe 12; the bottom of the arc-shaped cement gasket 17 can just fit against the inner wall of the new steel pipe 12, and the top can just fit against the outer wall of the inner liner pipe 18. The inner bottom elevation of the inner lining pipe 18 is adjusted by adjusting the thickness of the arc-shaped cement shims 17. Each arc-shaped cement shim 17 has a spigot at the front and a socket at the rear for connection during the jacking process. All equipment is dismantled and recycled, and the gap between the top of the new steel pipe 12 and both ends of the inner lining pipe 18 is sealed. A grouting hole is left at one end of the new steel pipe 12 and the inner lining pipe 18. Cement mortar grouting equipment is used to fill and compact the gap. After grouting, the cement mortar grouting equipment is recycled. The site is restored, the construction diversion is removed, and the pipeline's drainage capacity is restored.

[0082] It should be noted that in step S1, the sealing and diversion device includes a sealing airbag 19, a diversion pump 20, a suction pipe 21, and a pressure pipe 22. The first and last ends of adjacent old short pipes 3 are sealed with the sealing airbag 19, and the diversion pump 20 is installed between the tops of two corresponding inspection wells 23 at the ends of the old short pipes 3. One end of the suction pipe 21 is connected to one side of the diversion pump 20, and the other end extends into one of the inspection wells 23. One end of the pressure pipe 22 is connected to the other side of the diversion pump 20, and the other end extends into the other inspection well 23. The sealing airbag 19 is used to seal the pipe sections adjacent to the upstream and downstream ends of the old short pipes 3, and the diversion pump 20 is used to divert water between two inspection wells 23 adjacent to the upstream and downstream ends of the inspection wells 23 of the old short pipes 3 to be replaced.

[0083] In step S2, the push-pull device 4 includes a hydraulic cylinder 24, two support frames 25, and two support crossbars 26. The two support frames 25 are detachably mounted on opposite inner walls of the first working well 1 and connected to the ends of adjacent old short pipes 3. The two support crossbars 26 are parallel and horizontally spaced, with one end of each support crossbar 26 detachably connected to the support frame 25 and the other end detachably connected to one end of the hydraulic cylinder 24. The other end of the hydraulic cylinder 24 is drively connected to one end of the guide rod 5, used to drive the guide rod 5 to move back and forth within the cavity of the old short pipe 3. The hydraulic cylinder 24 can advance forward or pull the guide rod 5 backward. The two support frames 25 and the support crossbars 26 together provide a reverse support force for the hydraulic cylinder 24. The space between the two support crossbars 26 provides operating space for assembling and extending the guide rod 5.

[0084] In step S2, the guide rod 5 is formed by sequentially connecting multiple hollow short rods. Specifically, the guide rod 5 is formed by sequentially connecting multiple hollow short rods. Each short rod has a certain length of thread on its front inner wall and a certain length of thread on its rear outer wall. The thread on the rear outer wall of the previous short rod can be threaded together with the front inner wall of the next short rod. The guide rod 5 can be extended by assembling multiple short rods.

[0085] In step S2, the monitoring device 6 includes a connecting spindle, a first camera, and a second camera. One end of the connecting spindle is fixedly sleeved on the guide rod 5, and the first camera and the second camera are respectively installed on opposite sides of the other end. The monitoring device 6 can observe the old short pipe 3 in both front and rear directions, and is mainly used to observe the internal condition of the old short pipe 3, determine the pipe diameter in front and behind the old short pipe 3, and determine the travel distance of the guide rod 5, thereby locating the original pipe joint interface, etc.

[0086] In step S2, the traveling device 7 includes a positioning cylinder 27, two rows of positioning frames 28, and multiple rollers 29. The positioning cylinder 27 is fixedly sleeved on the guide rod 5. The two rows of positioning frames 28 are installed parallel and spaced on the positioning cylinder 27, and each row of positioning frames 28 includes multiple telescopic rods with the same spacing. One end of each telescopic rod is connected to the positioning cylinder 27 along the circumference of the positioning cylinder 27, and the other end is connected to a rotatable roller 29. The multiple rollers 29 are arranged on the inner wall of the old short pipe 3 in a forward and backward manner. Specifically, each row of positioning frames 28 has at least three telescopic rods, and the multiple telescopic rods are equidistantly distributed along the circumference of the positioning cylinder 27. By controlling the extension and retraction of the telescopic rods, the rollers 29 can be tightly attached to the inner wall of the old short pipe 3. During the forward or backward movement of the guide rod 5, the traveling device 7 moves on the inner wall of the old short pipe 3. The traveling device 7 is used to maintain the guide rod 5 at the center line of the pipe during the forward or backward movement.

[0087] In step S2, the cutting device 8 includes an annular rotating cylinder 30, multiple telescopic supports 31, and multiple cutting machines 32. The inner wall of the annular rotating cylinder 30 is fixedly sleeved on the guide rod 5, and the outer wall is rotatably sleeved on the inner wall of the annular rotating cylinder 30. One end of each telescopic support 31 is fixedly connected to the outer wall of the annular rotating cylinder 30 at intervals along its circumference, and the other end is telescopically connected to the cutting machine 32. The cutting machine 32 is movably installed inside the old short pipe 3 along its inner circumferential wall to cut the old short pipe 3 into multiple sections. The annular rotating cylinder 30 is divided into inner and outer walls. The outer wall can rotate around the inner wall and is driven by a motor located between the inner and outer walls. Simultaneously, there are at least three telescopic supports 31 distributed at equal intervals along the circumference of the annular rotating cylinder 30. As the guide rod 5 moves forward or backward, the telescopic support 31 retracts, and the cutting device 8 moves to the cutting position of the old short pipe 3. At this time, the telescopic support 31 extends, and the cutting machine 32 begins to cut the old short pipe 3. During the cutting process, the outer wall of the annular rotating cylinder 30 slowly rotates around the inner wall, cutting the entire pipe section. The telescopic support 31 retracts and then moves to the next cutting position under the drive of the guide rod 5. This cycle continues until the entire pipe section is cut into several old short pipe sections of a certain length. The cutting position of the cutting device 8 utilizes the original pipe section interface as much as possible for cutting.

[0088] In step S4, the pushing device 9 includes a connecting cylinder 33, multiple telescopic connecting rods 34, and multiple pushers 35. The connecting cylinder 33 is fixedly sleeved on the guide rod 5. One end of each telescopic connecting rod 34 is connected to the outer wall of the connecting cylinder 33 along its circumference, and the other end is connected to the pusher 35. The pushers 35 are used to push the old short pipe 3 through the hollow pipe jacking machine 10 to remove the new steel pipe 12. Specifically, there are at least three telescopic connecting rods 34, which are evenly distributed along the circumference of the connecting cylinder 33. When the guide rod 5 moves forward or backward, the telescopic connecting rods 34 retract, pushing the device 9 to the gap of the old short pipe 3 cut by the cutting device 8. The telescopic connecting rods 34 extend, and the pushers 35 are inserted into the gap of the old short pipe 3. The guide rod 5 moves forward, pushing a section of the old short pipe 3 out of the hollow pipe jacking machine 10 and pushing it out along the ball bearing guide rail 13 inside the new steel pipe 12 into the second working well 2.

[0089] Meanwhile, the hollow pipe jacking machine 10 has a double-layered circular pipe structure, with an annular hollow channel formed between its inner and outer circular pipes. The hollow channel allows the old short pipe 3 to pass through. During the forward jacking process, the hollow pipe jacking machine 10 will not cut the old short pipe 3, but will only cut the soil around the old short pipe 3. The front end of the hollow pipe jacking machine 10 is equipped with a cutter head that can cut the soil. The rotation of the cutter head is driven by a motor, which is located in the internal chamber enclosed by the inner and outer circular pipes.

[0090] In step S8, the ball bearing guide 13 includes an arc-shaped steel plate 36, two steel guide rails 37, and two rows of steel balls 38. The arc-shaped steel plate 36 is attached to the bottom inner wall of the new steel tube 12. The two steel guide rails 37 are respectively installed on both sides of the arc-shaped steel plate 36 along its length. Each row of steel balls 38 is intermittently embedded in the corresponding groove on the top surface of the steel guide rail 37. Specifically, the arc-shaped steel plate 36 is just attached to the inner wall of the new steel tube 12, and the ball bearing guide 13 is installed at the inner bottom of the new steel tube 12. The entire ball bearing guide 13 is assembled from multiple short ball bearing guides 13. The front end of the short ball bearing guide 13 has a steel insert, and the rear end has a steel socket. The ball bearing guide 13 is pushed forward together with the new steel tube 12.

[0091] The slurry circulation equipment includes a slurry circulation vehicle, an inlet pipe, and an outlet pipe. The inlet pipe is connected to the inlet pipe of the hollow pipe jacking machine 10, and the outlet pipe is connected to the outlet pipe of the hollow pipe jacking machine 10.

[0092] In step S9, the thixotropic mud drag reduction device 15 includes a thixotropic mud cart 39, a grouting main pipe 40, grouting ring pipes 41, and grouting short pipes 42. The top end of the grouting main pipe 40 is connected to the thixotropic mud cart 39, and the bottom end passes through the steel new pipe 12 and is connected to the grouting pipe inside the hollow pipe jacking machine 10. The steel new pipe 12 has multiple grouting holes distributed circumferentially. The grouting main pipe 40 is connected to multiple parallel grouting ring pipes 41 at intervals along its length, and each grouting ring pipe 41 is connected to multiple grouting short pipes 42 at intervals along its circumferential direction. Each grouting short pipe 42 is connected to each grouting hole in a one-to-one correspondence. Specifically, one out of every three sections of the new steel pipe 12 has multiple grouting holes evenly spaced along the circumference. A row of main grouting pipes 40 is provided along the inner wall of the new steel pipe 12. Every three sections of the main grouting pipes 40, a row of grouting ring pipes 41 tightly attached to the inner wall of the new steel pipe 12 is provided. Small grouting pipes 42 are evenly distributed on the grouting ring pipes 41. The number of small grouting pipes 42 is the same as the number of grouting holes on the new steel pipe 12. The small grouting pipes 42 can be inserted into the grouting holes. By grouting to reduce drag, the frictional resistance during the jacking process of the new steel pipe 12 can be effectively reduced.

[0093] The spraying trolley 16 includes a positioning main cylinder 43, multiple telescopic shafts 44, multiple rolling wheels 45, and a spray head 46. The positioning main cylinder 43 is sleeved on the guide rod 5 and is hollow inside to allow the spraying paint to pass through. One end of the side wall of the positioning main cylinder 43 is connected to the feed pipe, and the other end is connected to the spray head 46. The spray head 46 is used to spray anti-corrosion paint onto the inner wall of the new steel pipe 12. One end of the multiple telescopic shafts is connected to the positioning main cylinder 43 along the circumference of the positioning main cylinder 43, and the other end is connected to the rotatable rolling wheels 45. The rolling wheels 45 are movably arranged on the inner wall of the new steel pipe 12. Specifically, there are at least three telescopic shafts 44, evenly spaced along the circumference of the positioning main cylinder 43. The telescopic shafts 44 are controlled to ensure that the rolling wheels 45 are in close contact with the inner wall of the new steel pipe 12. A nozzle 46 is mounted at the front end of each telescopic shaft 44. As the spraying carriage 16 moves forward, the nozzle 46 sprays anti-corrosion coating to repair the inner corrosion of the new steel pipe 12. The end of the spraying carriage 16 is fixed to the guide rod 5, and the spraying carriage 16 is moved forward or backward by the push-pull device 4.

[0094] In summary, the trenchless expansion method for municipal pipelines proposed in this application enables in-situ upgrades of existing pipelines without excavation, and allows for the selection of whether to expand the pipe diameter as needed, while minimizing the impact on surrounding traffic, the environment, and other pipelines. Furthermore, it allows for the replacement of existing pipelines without excavation, avoiding large-scale damage to existing roads and the surrounding environment, and minimizing the impact on existing traffic conditions, resulting in good socio-economic benefits. In addition, the method incorporates construction diversion during the construction process, ensuring the drainage pipeline can be used normally during construction and avoiding disruption to the drainage needs of surrounding residents and businesses. Moreover, the method does not cause ground uplift during use, has minimal impact on surrounding underground pipelines and structures, offers high safety, and provides good socio-economic benefits. Simultaneously, the method has a high degree of mechanization and automation, is applicable to a wide range of pipe diameters, and has strong expansion capabilities, enabling the expansion and replacement of existing pipelines or pipe diameter replacement.

[0095] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for trenchless expansion of municipal pipelines, characterized in that, Includes the following steps: S1, the old short pipe to be replaced is dredged, blocked and diverted in sequence by the blocking and diversion equipment, and the first working well and the second working well are excavated at intervals on the old short pipe to be replaced; S2, a push-pull device is installed in the first working well, and the drive end of the push-pull device is connected to a guide rod with adjustable length to drive the guide rod to move back and forth in the old short pipe; a monitoring device, a walking device, and a cutting device are installed sequentially and at intervals on the end of the guide rod near the second working well. The monitoring device is used to monitor the situation inside the old short pipe, the walking device can walk on the inner wall of the old short pipe, and the cutting device is telescopically installed in the old short pipe for cutting the old short pipe. S3, start the push-pull device and push the guide rod forward toward the second working well, and start cutting the old short pipe through the cutting device, and cut the entire old short pipe into multiple old short pipe sections; S4. After the entire old short pipe is cut, the cutting equipment is removed, and a pushing device is installed on the guide rod to push the old short pipe from the first working well to the second working well. S5, a hollow pipe jacking machine is installed on the inner wall of the second working well near the guide rod, and a hydraulic jack is installed on the inner wall of the other side; S6, start the hydraulic jack and the hollow pipe jacking machine. The hollow pipe jacking machine cuts the soil around the first section of the old short pipe and pushes it forward continuously so that the first section of the old short pipe enters the hollow channel inside the hollow pipe jacking machine. After the first section of the old short pipe enters the hollow channel, start the push-pull device. The push-pull device pushes the guide rod and the pushing device, and pushes the first section of the old short pipe out of the hollow pipe jacking machine into the second working well and lifts it out. S7, hoist the first section of new steel pipe into the second working well, and connect both ends of the first section of new steel pipe to the hollow pipe jacking machine and the hydraulic jack respectively; start the hydraulic jack and the hollow pipe jacking machine, the first section of new steel pipe and the hollow pipe jacking machine advance forward under the action of the hydraulic jack, and while the hollow pipe jacking machine advances forward, it also cuts the soil around the second section of old short pipe so that the second section of old short pipe enters the hollow channel inside the hollow pipe jacking machine, and the first section of new steel pipe advances to the position where it was before the hollow pipe jacking machine; S8, after the second section of the old short pipe enters the hollow channel, the push-pull device is activated, which pushes the guide rod and the pushing device, and pushes the second section of the old short pipe out of the hollow pipe jacking machine onto the ball bearing guide rail in the new steel pipe, and drives the second section of the old short pipe to be pushed along the ball bearing guide rail into the second working well and lifted out; the ball bearing guide rail includes an arc-shaped steel plate, two steel guide rails and two rows of steel balls; the arc-shaped steel plate is attached to the bottom inner wall of the new steel pipe; the two steel guide rails are respectively installed on both sides of the arc-shaped steel plate along the length direction of the arc-shaped steel plate; each row of steel balls is intermittently embedded in the corresponding groove on the top surface of the steel guide rail; S9, hoist in the second section of the new steel pipe, and repeat the operations in steps S7 to S8 until all the old short pipes are replaced with all the new steel pipes; a grouting hole is opened on one of the three sections of the new steel pipe, and a thixotropic mud drag reduction device connected to the grouting hole is installed on the top of the first working well, the thixotropic mud drag reduction device is started and thixotropic mud is injected into the grouting hole; S10, dismantle and recycle the push-pull equipment, the hollow pipe jacking machine, the ball bearing guide rail, and the thixotropic mud drag reduction equipment, and clean the inside of the new steel pipe.

2. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S10, if the diameter of the new steel pipe is the diameter required for municipal pipeline construction, after all the demolition and cleaning work is completed, the push-pull device is reinstalled in the first working well, and a spraying trolley is installed on the guide rod. The spraying trolley is movably installed on the inner wall of the new steel pipe. The push-pull device is started, driving the guide rod to move the spraying trolley on the inner wall of the new steel pipe, and spraying an anti-corrosion lining onto the inner wall of the new steel pipe.

3. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S10, if the diameter of the new steel pipe is larger than the diameter required for the municipal pipeline construction, after all the demolition and cleaning work is completed, an arc-shaped cement gasket is pushed into the new steel pipe so that the arc-shaped cement gasket fits against the inner wall of the bottom of the new steel pipe; an inner liner pipe with the required diameter for the municipal pipeline construction is hoisted in and pushed into the cavity formed by the arc-shaped cement gasket and the new steel pipe; the gap between the top of the new steel pipe and both ends of the inner liner pipe is sealed, and the gap is filled with grout to make it dense.

4. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S1, the sealing and diversion device includes a sealing airbag, a diversion pump, a suction pipe, and a pressure pipe; the first and last ends of the adjacent old short pipes are sealed with the sealing airbags, and the diversion pump is installed between the tops of two inspection wells corresponding to the ends of the old short pipes; one end of the suction pipe is connected to one side of the diversion pump, and the other end extends into one of the inspection wells; one end of the pressure pipe is connected to the other side of the diversion pump, and the other end extends into the other inspection well.

5. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S2, the push-pull device includes a hydraulic cylinder, two support frames, and a support crossbar; the two support frames are detachably installed on opposite inner walls of the first working well and connected to the ends of adjacent old short pipes respectively; the support crossbar is horizontally arranged, with one end detachably connected to the support frame and the other end detachably connected to one end of the hydraulic cylinder; the other end of the hydraulic cylinder is drively connected to one end of the guide rod, for driving the guide rod to move back and forth in the inner cavity of the old short pipe.

6. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S2, the guide rod is formed by sequentially threading together multiple hollow short rods.

7. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S2, the monitoring device includes a connecting spindle, a first camera, and a second camera; one end of the connecting spindle is fixedly sleeved on the guide rod, and the first camera and the second camera are respectively installed on opposite sides of the other end.

8. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S2, the walking device includes a positioning cylinder, two rows of positioning frames, and multiple rollers; the positioning cylinder is fixedly sleeved on the guide rod; the two rows of positioning frames are installed parallel and spaced apart on the positioning cylinder, and each row of positioning frames includes multiple telescopic rods with the same spacing; one end of each telescopic rod is connected to the positioning cylinder along the circumference of the positioning cylinder, and the other end is connected to the rotatable rollers; the multiple rollers are arranged on the inner wall of the old short pipe in a forward and backward movement manner.

9. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S2, the cutting equipment includes an annular rotating cylinder, multiple telescopic supports, and multiple cutting machines; the inner wall of the annular rotating cylinder is fixedly sleeved on the guide rod, and the outer wall is rotatably sleeved on the inner wall of the annular rotating cylinder; one end of each of the multiple telescopic supports is fixedly connected at intervals along the circumference of the annular rotating cylinder to the outer wall of the annular rotating cylinder, and the other end is telescopically connected to the cutting machine; the cutting machine is movably installed inside the old short pipe along the inner circumferential wall of the old short pipe, and is used to cut the old short pipe into multiple sections of the old short pipe.

10. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S4, the pushing device includes a connecting cylinder, multiple telescopic connecting rods, and multiple pushers; the connecting cylinder is fixedly sleeved on the guide rod; one end of each of the multiple telescopic connecting rods is connected to the outer wall of the connecting cylinder along the circumference of the connecting cylinder, and the other end is connected to the pusher; the multiple pushers are used to push the old short pipe through the hollow pipe jacking machine to remove the new steel pipe.

11. The method for trenchless expansion of municipal pipelines according to claim 1, characterized in that, In step S9, the thixotropic mud drag reduction device includes a thixotropic mud truck, a main grouting pipe, a grouting ring pipe, and grouting short pipes; the top end of the main grouting pipe is connected to the thixotropic mud truck, and the bottom end passes through the new steel pipe and is connected to the grouting pipe inside the hollow pipe jacking machine; the new steel pipe has multiple grouting holes distributed circumferentially; the main grouting pipe is connected at intervals along its length to multiple parallel grouting ring pipes, and each grouting ring pipe is connected at intervals along its circumferential direction to multiple grouting short pipes; each grouting short pipe is connected to each grouting hole in a one-to-one correspondence.

12. The method for trenchless expansion of municipal pipelines according to claim 2, characterized in that, The spraying trolley includes a positioning main cylinder, multiple telescopic shafts, multiple rolling wheels, and a spray head. The positioning main cylinder is sleeved on the guide rod and is hollow inside to allow the spray coating to pass through. One end of the positioning main cylinder is connected to the feed pipe, and the other end is connected to the spray head, which is used to spray anti-corrosion coating onto the inner wall of the new steel pipe. One end of each of the multiple telescopic shafts is connected to the positioning main cylinder circumferentially, and the other end is connected to the rotatable rolling wheels. The rolling wheels are movably mounted on the inner wall of the new steel pipe.

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