A pipeline in-situ demolition and renewal construction method

Abstract

The invention provides a pipeline in-situ demolition and renewal construction method, comprising the following steps: making construction preparations; constructing a working well; installing the pipe jacking equipment after hoisting it into the starting well, and then installing the slag discharge equipment at the front end of the pipe jacking machine or arranging it in front of the pipe jacking machine; pushing the pipe jacking machine forward according to the planned route by a propulsion device, pushing in a new pipe section while the pipe jacking machine cuts the old pipe, and forming a new pipe by a reciprocating cycle, and at the same time, discharging the slag forward through a receiving well and / or the old well by the slag discharge equipment; the pipe jacking machine is pushed out of the receiving well; after the pipe jacking equipment and the slag discharge equipment are dismantled and hoisted out, an inspection well is built at the location of the starting well and the receiving well; the invention adopts a forward slag discharge method, which saves the layout space of the pipe jacking equipment and the working space of the starting well compared with the prior art. In addition, the invention does not need to inject grout into the pipeline, and when applied to the working condition where the old pipe is covered with shallow soil, it can effectively control the surface deformation.

Description

Technical Field

[0001] The invention relates to the technical field of underground pipeline demolition and renewal, and in particular to an in-situ pipeline demolition and renewal construction method. Background Art

[0002] When updating old and obsolete underground pipes in cities, open-cut construction is usually adopted. However, the open-cut method for pipeline construction not only has low construction efficiency, but also has a great impact on the surrounding environment during the construction process.

[0003] In response to the above problems, the commonly used solution is to design a new method for trenchless pipeline renewal construction system, such as the trenchless pipeline renewal method and construction system published in the Chinese invention patent application with application publication number CN111810715A, which includes the following steps: diverting the medium in the pipe of the non-construction section; constructing the starting well and the receiving well at both ends of the construction section; sealing both ends of the construction section and grouting the pipe in the construction section so that the jacking construction is in a mud-water balance state; assembling the jacking machine and the subsequent supporting equipment (the jacking machine and the subsequent supporting equipment constitute the jacking equipment) in the starting well to complete the jacking machine out of the hole; cutting and excavating the original pipeline (i.e., the old pipeline) and pushing and laying the new pipe section through the jacking machine cycle to form a new pipeline and complete the jacking machine into the hole; dismantling and lifting the jacking equipment; finally, connecting the old pipeline with the new pipeline.

[0004] During the renewal construction of the pipeline in the above-mentioned patent, grouting is required to be performed inside the pipeline in the construction section so that the pipe jacking construction is in a mud-water balance state, which is suitable for working conditions where the old pipeline is covered with deep soil. However, when the old pipeline is covered with shallow soil, replacing the old pipeline by means of mud-water balance is prone to slurry bubbling, making it difficult to control surface deformation. In addition, in the above-mentioned patent, the debris generated after the old pipeline is cut is discharged backwards through the starting well by the mud circulation equipment (i.e., the slag discharge equipment). The backward slag discharge method requires the slag discharge equipment to discharge the waste slag through the pipe jacking equipment and the starting well, which will cause the slag discharge equipment to occupy a large amount of space for the layout of the pipe jacking equipment and the space of the starting well. Summary of the invention

[0005] The purpose of the present invention is to provide a pipeline in-situ demolition and renewal construction method to solve the problem that when the old pipeline is covered with shallow soil, it is difficult to control the surface deformation by using mud-water balance, and the problem that the slag discharge equipment occupies a large amount of layout space of the jacking equipment and the starting well space due to the backward slag discharge during construction.

[0006] To achieve the above purpose, the pipeline in-situ demolition and renewal construction method of the present invention adopts the following technical scheme:

[0007] A pipeline in-situ demolition and renewal construction method comprises the following steps:

[0008] Step 1: Construction preparation: determine the pipeline in-situ demolition and renewal construction section;

[0009] Step 2: Working well construction: The working well includes the starting well and the receiving well. After the positions of the starting well and the receiving well are determined, the working well construction is carried out;

[0010] Step 3: Equipment installation: The equipment to be installed includes pipe jacking equipment and slag removal equipment. The propulsion device of the pipe jacking equipment and the pipe jacking machine are hoisted into the starting well for installation, and then the slag removal equipment is installed at the front end of the pipe jacking machine.

[0011] Step 4: Jacking construction: The jacking machine is pushed forward along the planned route by the propulsion device, and the new pipe section is pushed forward while the jacking machine cuts the old pipe, and a new pipe section is formed by reciprocating the cycle. At the same time, the slag generated by cutting the old pipe is placed at the front end of the slag discharge device, and then transported forward through the old pipe (1) to be discharged through the receiving well and / or the old well located between the starting well and the receiving well. The front end of the slag discharge device is located between the starting well (3) and the receiving well (4);

[0012] Step 5: Pipe jacking machine receiving: The pipe jacking machine is pushed out of the receiving well and the hole ring is sealed;

[0013] Step 6. Construction of inspection wells: After dismantling and hoisting the pipe jacking equipment and slag discharge equipment, build inspection wells at the locations of the starting well and the receiving well.

[0014] The beneficial effect of the above technical solution is that during the in-situ pipeline demolition and renewal construction process, when installing the equipment in step three, the slag discharge equipment is installed at the front end of the pipe jacking machine or arranged in front of the pipe jacking machine. During the jacking construction in step four, the slag is discharged forward through the receiving well and / or the old well between the starting well and the receiving well by the slag discharge equipment. That is, the present invention adopts a forward slag discharge method, which saves the layout space of the pipe jacking equipment and the working space of the starting well compared with the prior art; in addition, the construction method of the present invention does not require grouting into the pipeline. When applied to the working condition where the old pipe is covered with shallow soil, it can effectively control the surface deformation.

[0015] Furthermore, in step three, the cutter disc at the front end of the main machine of the pipe jacking machine is used to cut the old pipe, and at least the conveying device arranged in front of the main machine is used as a slag discharge device; when the equipment is installed, the fixed body of the conveying device is passed through the cutter disc and fixedly connected to the main machine, so that the rear end of the conveying component of the conveying device is placed in the soil bin behind the cutter disc to receive the slag stone that is brought up and dropped by the slag chute on the cutter disc; the slag stone cut off by the cutter disc is blocked between the slag blocking device and the cutter disc by a slag blocking device fixed on the fixed body and located in front of the cutter disc, so that the slag stone can enter the soil bin through the slag inlet on the cutter disc.

[0016] The beneficial effect of the above technical solution is that the conveying device is used to discharge slag, which is convenient, and the fixed body of the conveying device passes through the cutter disc and is fixedly connected to the main machine, so that the conveying device is fixed. At the same time, the rear end of the conveying component of the conveying device is placed in the soil bin behind the cutter disc, which is convenient for receiving the slag and stone that are brought up and dropped by the slag plate on the cutter disc, and then convenient for conveying the slag and stone forward. At the same time, the slag blocking device fixed on the fixed body and located in front of the cutter disc is used to block the slag and stone cut off by the cutter disc between the slag blocking device and the cutter disc, so that the slag and stone can enter the soil bin through the slag inlet on the cutter disc, so as to achieve effective discharge of the slag and stone.

[0017] Furthermore, the conveying device and the slag transport trolley are used as slag discharge equipment, and the slag transport trolley is used to receive and store slag discharged by the conveying device.

[0018] The beneficial effect of the above technical solution is that the slag transport trolley can receive and store the slag discharged by the conveying device, and cooperate with the conveying device to realize the discharge of slag.

[0019] Furthermore, when the slag transport vehicle passes through the old well, the slag is discharged from the old well.

[0020] The beneficial effect of the above technical solution is that there is no need to set up a large slag transport vehicle, which is convenient for layout and movement.

[0021] Furthermore, a plurality of supporting devices for supporting the conveying device are fixed outside the fixed body.

[0022] The beneficial effect of the above technical solution is that the stability of the conveying device can be improved.

[0023] Furthermore, the conveying device and a suction pipe arranged in front of the conveying device are used as slag discharge equipment, and the slag discharged by the conveying device is sucked out of the old pipeline by using the suction pipe.

[0024] The beneficial effect of the above technical solution is that the suction pipe can extract the slag and stone discharged by the conveying device, so the slag discharge is more convenient.

[0025] Furthermore, a screw shaft with spiral blades is used as a conveying component of the conveying device, and the screw shaft is connected to the main machine through a transmission system, and the main machine drives the screw shaft to rotate; a cylinder is used as the fixed body of the conveying device, and an upward feed port is opened on the part of the cylinder in the soil bin.

[0026] The beneficial effects of the above technical solution are that the spiral conveyor for slag removal is easy to use and also convenient for fixing and installing the slag blocking device.

[0027] Furthermore, in step three, a high-pressure water pipe installed at the front end of the pipe jacking machine is used as a slag discharge device, and the slag is flushed into the receiving well by high-pressure water sprayed from the high-pressure water pipe.

[0028] The beneficial effect of the above technical solution is that the high-pressure water sprayed from the high-pressure water pipe directly flushes the slag into the receiving well, and the structure is simple and the operation is convenient.

[0029] Furthermore, in step three, a suction pipe arranged in front of the pipe jacking machine is used as a slag removal device, and the slag generated by the pipe jacking machine cutting the old pipe is directly extracted out of the old pipe by the suction pipe.

[0030] The beneficial effects of the above technical solution are: the slag discharge equipment is simple and easy to arrange. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the construction preparation state of the first embodiment of the pipeline in-situ demolition and renewal construction method of the present invention;

[0032] Figure 2 A schematic diagram of the working well construction state of the first embodiment of the pipeline in-situ breaking and updating construction method of the present invention;

[0033] Figure 3 It is a schematic diagram of the equipment installation state of the first embodiment of the pipeline in-situ demolition and renewal construction method of the present invention;

[0034] Figure 4 It is a partial structural front view of the pipe jacking machine, the conveying device and the slag transport trolley in the first embodiment of the pipeline in-situ breaking and updating construction method of the present invention;

[0035] Figure 5 It is a cross-sectional view of the slag plate portion of the pipe jacking machine in the first embodiment of the pipeline in-situ breaking and updating construction method of the present invention;

[0036] Figure 6 It is a schematic diagram of the jacking construction state of the first embodiment of the pipeline in-situ breaking and updating construction method of the present invention;

[0037] Figure 7 It is a schematic diagram of the pipe jacking receiving state of the first embodiment of the pipeline in-situ breaking and updating construction method of the present invention;

[0038] Figure 8 It is a schematic diagram of the construction state of the inspection well in the first embodiment of the pipeline in-situ breaking and updating construction method of the present invention;

[0039] Fig. 9 This is a schematic diagram of the state of building a new well in the first embodiment of the pipeline in-situ breaking and updating construction method of the present invention;

[0040] Fig.10 This is a schematic diagram of the equipment installation state of the second embodiment of the pipeline in-situ demolition and renewal construction method of the present invention;

[0041] Fig.11It is a schematic diagram of the equipment installation state of the third embodiment of the pipeline in-situ demolition and renewal construction method of the present invention;

[0042] Fig.12 It is a schematic diagram of the jacking construction state of the fourth embodiment of the pipeline in-situ breaking and updating construction method of the present invention;

[0043] Fig.13 It is a schematic diagram of the equipment installation state of the fifth embodiment of the pipeline in-situ demolition and renewal construction method of the present invention;

[0044] Fig.14 It is a schematic diagram of the jacking construction state of Example 5 of the pipeline in-situ breaking and updating construction method in the present invention.

[0045] In the figure: 1. old pipeline; 2. old well; 3. starting well; 4. receiving well; 5. thrust cylinder; 6. conveying device; 6-1. fixed main body; 6-2. conveying parts; 7. slag transport trolley; 8. supporting device; 9. high-pressure water pipe; 10. new pipe section; 11. slag; 12. detachable pipe section; 13. inspection well; 14. new well; 15. vacuum pump; 16. pipe jacking machine; 16-1. main machine; 16-2. cutter head; 16-3. soil bin; 16-4. slag chute; 17. slag blocking device; 17-1. baffle seat; 17-2. movable baffle; 18. suction pipe. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0048] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0049] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0050] Embodiment 1 of the pipeline in-situ demolition and renewal construction method (hereinafter referred to as the construction method) of the present invention is as follows: Figure 1-9 As shown, the following steps are included:

[0051] Step 1: Construction preparation: Figure 1 As shown, the old pipeline 1 is demolished in situ and the construction section is updated, and the sewage at both ends of the pipeline in the non-construction section is diverted.

[0052] Step 2: Work pit construction: Figure 2 As shown, the working well includes a launching well 3 and a receiving well 4. After the locations of the launching well 3 and the receiving well 4 are determined, the launching well 3 and the receiving well 4 are constructed. In order to reduce the impact of the construction on the surrounding environment, simplify the working well construction process, and also reduce the construction cost, the launching well 3 and the receiving well 4 are constructed by sinking a steel casing on the basis of the old well 2. The sinking of the steel casing is an existing technology and will not be described in detail here.

[0053] Step 3: Equipment installation: Figure 3 As shown, the equipment to be installed includes pipe jacking equipment and slag removal equipment, wherein the pipe jacking equipment includes a propulsion device and a pipe jacking machine 16, and the propulsion device includes a propulsion cylinder 5 for pushing the pipe jacking machine 16 forward and a cylinder valve (not shown in the figure) for controlling the action of the propulsion cylinder 5. Figure 4 As shown, a cutter disc 16-2 is installed at the front end of the main machine 16-1 of the pipe jacking machine 16. The cutter disc 16-2 is used to cut the old pipe 1. A soil bin 16-3 is arranged at the rear side of the cutter disc 16-2. A slag inlet for slag to enter the soil bin 16-3 is arranged on the cutter disc 16-2. A slag chute plate 16-4 is fixed on the cutter disc 16-2. The slag chute plate 16-4 is located in the soil bin 16-3 and rotates synchronously with the cutter disc 16-2 to carry the slag upwards. Figure 5 shown.

[0054] The slag discharge equipment includes a conveying device 6 arranged in front of the main machine 16-1 and a slag transport trolley 7 arranged at the front end of the conveying device 6, and the slag transport trolley 7 is used to receive and store the slag discharged by the conveying device 6. The conveying device 6 includes a fixed body 6-1 and a conveying component 6-2. The conveying device 6 in this embodiment is a screw conveyor, that is, a cylinder is used as the fixed body 6-1, and an upward feed port is opened on the cylinder in the soil bin. A spiral shaft with spiral blades is used as the conveying component 6-2, and the spiral shaft is connected to the main machine 16-1 by transmission, and the spiral shaft is driven by the main machine 16-1 to rotate. Therefore, a driving device for driving the cutter disc and the spiral shaft to rotate is provided in the main machine 16-1. The driving device can be a planetary gear mechanism, for example, the cutter disc is connected to the outer gear ring of the planetary gear mechanism by transmission, the spiral shaft is connected to the sun gear of the planetary gear mechanism by transmission, and the planetary carrier of the planetary gear mechanism is a brake element. The fixed body is fixedly connected to the planetary carrier, so that the cutter disc and the spiral shaft can be rotated synchronously. This form is similar to the driving form in CN104265998A. Of course, there may be two sets of driving devices which are independent of each other and are used to drive the screw shaft and the cutter disc to rotate separately.

[0055] When installing the equipment, the fixed body 6-1 of the conveying device 6 is passed through the cutter disc 16-2 and fixedly connected to the main machine 16-1, so that the rear end of the conveying component 6-2 of the conveying device 6 is placed in the soil bin 16-3 behind the cutter disc 16-2 to receive the slag and stone that are lifted up and dropped by the slag chute 16-4. Figure 3 As shown, the slag blocking device 17 fixed on the fixed body 6-1 and located in front of the cutter disc 16-2 is used to block the slag cut by the cutter disc 16-2 between the slag blocking device 17 and the cutter disc 16-2, so that the slag can enter the soil bin 16-3 through the slag inlet on the cutter disc 16-2. Figure 4 As shown, the slag blocking device 17 includes a baffle seat 17-1 fixed to the outside of the fixed body 6-1 and a movable baffle 17-2 hinged on the baffle seat 17-1, and multiple movable baffles 17-2 are arranged along the circumferential direction. An elastic member, such as a torsion spring, is provided between the movable baffle 17-2 and the baffle seat 17-1 to enable the movable baffle 17-2 to elastically press against the inner wall of the old pipe 1.

[0056] Step 4: Jacking construction: Figure 6 As shown, by controlling the oil cylinder valve, the pipe jacking machine 16 is pushed forward according to the planned route. While the pipe jacking machine 16 cuts the old pipe 1, it pushes the new pipe section 10, and the new pipe is formed by reciprocating cycles. When the pipe jacking machine 16 is pushed forward, the cutter head 16-2 cuts the old pipe 1. Figure 4 and Figure 5As shown, the slag 11 produced by cutting the old pipe 1 first enters the soil bin 16-3, and the rotation of the slag plate 16-4 drives the slag 11 to rotate. When the slag plate 16-4 moves to above the feed port of the fixed body 6-1, since the slag plate 16-4 has a certain inclination angle, the slag 11 enters the fixed body 6-1 along the slag plate 16-4, and is transported to the slag transport trolley 7 as the spiral shaft rotates. When the slag transport trolley 7 passes through the old well 2 or the receiving well 4, the slag 11 is discharged.

[0057] Step 5: Pipe jacking reception: Figure 7 As shown, the pipe jacking machine 16 is pushed out of the receiving well 4 and the hole ring is sealed.

[0058] Step 6: Construction of inspection well 13: Figure 8 As shown, after the pipe jacking equipment and the slag removal equipment are dismantled and hoisted out, an inspection well 13 is built at the location of the starting well 3 and the receiving well 4;

[0059] After the inspection well 13 is built, the abandoned old well 2 is backfilled. Fig. 9 As shown, when it is necessary to build a new well 14 between two inspection wells 13 according to planning requirements, during the jacking construction process in step 4, as shown in FIG. Figure 7 As shown, a detachable pipe section 12 is installed at a position in the new pipeline corresponding to the planned new well 14. Specifically, the detachable pipe section 12 is detachably connected to the adjacent new pipe section 10 via a flange. When the new well 14 is constructed, the detachable pipe section 12 is removed.

[0060] The present invention adopts a forward slag discharge method, which saves the layout space of the jacking equipment and the working space of the starting well compared with the prior art; in addition, the construction method of the present invention does not require grouting into the pipeline, and when applied to the working condition where the old pipe is covered with shallow soil, it can effectively control the surface deformation.

[0061] Example 2 of the pipeline in-situ demolition and renewal construction method of the present invention is as follows Fig.10 As shown, different from Example 1, in Example 2, the conveying device 6 is configured to be multi-section, and the fixed bodies of two adjacent sections of the conveying device 6 and the conveying components are all detachably connected, so that the multi-section conveying device 6 directly passes through the old pipeline 1 and extends into the receiving well 4. Since the conveying device 6 is relatively long, in order to improve stability, a plurality of supporting devices 8 for supporting the conveying device 6 are fixed outside the fixed body of the conveying device 6. The supporting device 8 may specifically include a supporting rod hinged to the outside of the fixed body, and a spring is connected between the supporting rod and the fixed body, so that the end of the supporting rod is elastically pressed against the inner wall of the old pipeline 1.

[0062] During the jacking construction, the slag is directly discharged into the receiving shaft 4. When a section of the conveying device 6 enters the receiving shaft 4, this section of the conveying device is removed to ensure that the subsequent conveying device 6 can continue to move forward.

[0063] Example 3 of the pipeline in-situ demolition and renewal construction method of the present invention is as follows Fig.11 As shown, different from Example 1 and Example 2, the slag discharge equipment includes a high-pressure water pipe 9 installed at the front end of the pipe jacking machine 16. During the jacking construction, the high-pressure water sprayed from the high-pressure water pipe 9 flushes the slag 11 into the receiving well 4.

[0064] Example 4 of the pipeline in-situ demolition and renewal construction method of the present invention is as follows Fig.12 , which is different from Example 1, the conveying device 6 and the suction pipe 18 arranged in front of the conveying device 6 are used as slag discharge equipment, and the suction pipe 18 is used to extract the slag discharged by the conveying device 6 out of the old pipeline 1.

[0065] Example 5 of the pipeline in-situ demolition and renewal construction method of the present invention is as follows Fig.13 and Fig.14 As shown, different from Example 4, the suction pipe 18 arranged in front of the pipe jacking machine 16 is directly used as the slag removal equipment. When the equipment is installed, the vacuum pump 15 connected to the suction pipe 18 is set on the ground, and the suction pipe 18 is extended into the old pipeline 1 through the old well 2 or the receiving well 4, and extends to the front side of the pipe jacking machine 16. During the jacking construction, the slag 11 is extracted through the suction pipe 18. In order to facilitate the construction, as the pipe jacking machine 16 is pushed forward, the vacuum pump 15 is continuously moved forward. At the same time, the suction pipe 18 is extended into the old pipeline 1 through the old well 2 or the receiving well 4 closer to the receiving well 4.

[0066] In other embodiments of the pipeline in-situ demolition and renewal construction method, the abandoned old well is backfilled not with the slag collected during the construction process, but with other backfill materials.

[0067] In other embodiments of the pipeline in-situ demolition and renewal construction method, when a new well is built according to planning requirements, during the jacking construction in step four, no detachable pipe section is set at the position in the new pipeline corresponding to the planned new well, and the pipe section at that location is cut when the new well is built.

[0068] In other embodiments of the pipeline in-situ demolition and renewal construction method, if the locations of two inspection wells are close and meet planning requirements, there is no need to build a new well.

[0069] In other embodiments of the pipeline in-situ breaking and renewal construction method, in step 2, the construction of the starting well and the receiving well does not adopt the method of sinking the steel casing, but other construction methods are selected according to the construction environment.

[0070] In other embodiments of the pipeline in-situ demolition and renewal construction method, when the conveying device is a multi-section device that directly extends into the receiving well, the supporting device may not be fixed on the outside of the fixed body.

[0071] In other embodiments of the pipeline in-situ demolition and renewal construction method, when the slag discharge equipment includes a slag transport car, if the capacity of the slag transport car is large, during the jacking construction, the slag and stone can be discharged uniformly after the slag transport car arrives at the receiving well.

[0072] In other embodiments of the pipeline in-situ demolition and renewal construction method, the conveying device can also be a belt conveyor. In this case, the fixed main body is a frame, the conveying component is a conveyor belt, and the conveying component does not need to be connected to the main machine transmission.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A pipeline in-situ demolition and renewal construction method, characterized in that: The following steps are involved: Step 1: Construction preparation: determine the pipeline in-situ demolition and renewal construction section; Step 2: Working well construction: The working well includes the starting well and the receiving well. After the positions of the starting well and the receiving well are determined, the working well construction is carried out; Step 3: Equipment installation: The equipment to be installed includes pipe jacking equipment and slag removal equipment. The propulsion device of the pipe jacking equipment and the pipe jacking machine are hoisted into the starting well for installation, and then the slag removal equipment is installed at the front end of the pipe jacking machine. Step 4: Jacking construction: The jacking machine is pushed forward along the planned route by the propulsion device, and the new pipe section is pushed forward while the jacking machine cuts the old pipe, and a new pipe is formed by reciprocating cycles. At the same time, the slag produced by cutting the old pipe is placed at the front end of the slag discharge device through the slag discharge device, and then transported forward through the old pipe to be discharged through the receiving well and / or the old well between the starting well and the receiving well. The front end of the slag discharge device is located between the starting well and the receiving well. Step 5: Pipe jacking machine receiving: The pipe jacking machine is pushed out of the receiving well and the hole ring is sealed; Step 6. Construction of inspection wells: After dismantling and hoisting the pipe jacking equipment and slag discharge equipment, build inspection wells at the locations of the starting well and the receiving well.

2. The pipeline in-situ demolition and renewal construction method according to claim 1 is characterized in that: In step three, the cutter disc at the front end of the main machine of the pipe jacking machine is used to cut the old pipe, and at least the conveying device arranged in front of the main machine is used as a slag discharge device; when the equipment is installed, the fixed body of the conveying device is passed through the cutter disc and fixedly connected to the main machine, so that the rear end of the conveying component of the conveying device is placed in the soil bin behind the cutter disc to receive the slag stone that is brought up and dropped by the slag chute on the cutter disc; the slag stone cut off by the cutter disc is blocked between the slag blocking device and the cutter disc by a slag blocking device fixed on the fixed body and located in front of the cutter disc, so that the slag stone can enter the soil bin through the slag inlet on the cutter disc.

3. The pipeline in-situ demolition and renewal construction method according to claim 2 is characterized in that: The conveying device and the slag transport trolley are used as slag discharge equipment, and the slag transport trolley is used to receive and store slag discharged by the conveying device.

4. The pipeline in-situ demolition and renewal construction method according to claim 3 is characterized in that: When the slag transport car passes by the old well, the slag is discharged from the old well.

5. The pipeline in-situ demolition and renewal construction method according to claim 2 is characterized in that: A plurality of supporting devices for supporting the conveying device are fixed outside the fixed body.

6. The pipeline in-situ demolition and renewal construction method according to claim 2 is characterized in that: The conveying device and a suction pipe arranged in front of the conveying device are used as slag discharge equipment, and the slag discharged by the conveying device is sucked out of the old pipeline by the suction pipe.

7. The pipeline in-situ demolition and renewal construction method according to any one of claims 2 to 6, characterized in that: A screw shaft with spiral blades is used as the conveying component of the conveying device, and the screw shaft is connected to the main machine through transmission, and the main machine drives the screw shaft to rotate; a cylinder is used as the fixed body of the conveying device, and an upward feed port is opened on the part of the cylinder in the soil bin.

8. The pipeline in-situ demolition and renewal construction method according to claim 1 is characterized in that: In step three, a high-pressure water pipe installed at the front end of the pipe jacking machine is used as a slag discharge device, and the slag is flushed into the receiving well by high-pressure water sprayed from the high-pressure water pipe.

9. The pipeline in-situ demolition and renewal construction method according to claim 1 is characterized in that: In step three, a suction pipe arranged in front of the pipe jacking machine is used as a slag removal device, and the slag produced by the pipe jacking machine cutting the old pipe is directly extracted out of the old pipe through the suction pipe.

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