Pumping deslagging device for long-distance rectangular jacking pipe and working method

Abstract

The invention relates to the field of underground engineering construction technology auxiliary equipment, and provides a pumping deslagging device for a long-distance rectangular jacking pipe, the pumping deslagging device comprises a stirring assembly and a pumping assembly, the stirring assembly is arranged below a discharge port of a spiral unearthing device, the pumping assembly comprises a muck pump and a pumping pipeline, the muck pump is arranged below a discharge port of the stirring assembly, and the pumping pipeline is connected with the stirring assembly. A feeding port of the muck pump is connected with a discharging port of the stirring assembly, a discharging port of the muck pump is connected with the pumping pipeline, and an outlet of the pumping pipeline is formed in the muck pool. The device further comprises a grouting assembly and a plurality of resistance reduction rings. The grouting assembly comprises a first grouting mechanism and a second grouting mechanism. The construction efficiency is greatly improved, the method can adapt to different stratum conditions, and efficient construction of the long-distance earth pressure balance rectangular pipe jacking is achieved.

Description

Technical Field

[0001] The invention relates to the field of technical auxiliary equipment for underground engineering construction, and in particular to a slag discharge device and a working method in long-distance rectangular jacking pipe construction operations. Background Art

[0002] The construction of earth pressure balanced rectangular jacking pipe adopts spiral excavator to excavate the soil, cooperates with muck truck for horizontal transportation, and then uses mechanical lifting equipment for vertical transportation to transport the soil to the ground muck pool. However, engineering practice has found that the larger the section of the jacking pipe excavation and the longer the jacking distance, the greater the amount of slag discharged from each jacking pipe section. The time required for slag discharge using the original muck truck is longer and the efficiency is lower. Taking the 10.4m×7.5m rectangular jacking pipe as an example, the slag discharge of each jacking length of 1.5m is about 90m 3 , volume 5m 3 The muck trucks need to be loaded at least 18 times, and each truck takes 30 minutes, with a cumulative loading time of more than 9 hours. The longer the jacking distance, the longer the time. In addition, the muck trucks cause serious idleness during horizontal and vertical transportation, and there are many safety hazards in vertical lifting, which invisibly increases construction costs and safety risks.

[0003] In the prior art, the invention patent "Publication No.: CN107956478A, Name: Excavation Device and Excavation Method for Earth Pressure Balance Shield or Jacking Pipe Construction" proposes a technical solution that uses multiple pumping equipment to improve the efficiency of slag pumping; the invention patent "Publication No. CN111577314A, Name: Slag Discharging Device and Slag Discharging Method for Earth Pressure Balance Jacking Pipe Construction" proposes a technical solution that uses an improved slag bucket to improve the fluidity of the slag.

[0004] However, the above two existing technologies lack consideration of the adaptability of the stratum and the pumpability of the slag. Because the geological conditions of each pipe jacking project are different, the soil cut by the pipe jacking machine cutter is first improved in the soil bin and discharged through the spiral excavator. Although the slag has certain plasticity, fluidity and workability, when encountering a complex soil layer environment, such as gravel, clay or high-viscosity clay in the stratum, the fluidity and workability of the slag after the first improvement are not obvious, and the lack of pumpability will easily cause pipe blockage when pumping to the ground, which may lead to failure of slag discharge, and then cause delays in construction and economic losses.

[0005] Therefore, in the face of the aforementioned complex soil environment, it is urgent to propose a device and a pumping method that is more adaptable to the strata, more efficient, more environmentally friendly, and more suitable for long-distance rectangular jacking pipe muck pumping. Summary of the invention

[0006] In view of the above technical problems, the present invention provides a slag pumping device and working method for long-distance rectangular jacking pipes, which can effectively remove impurities in the slag and further modify the slag into a paste that is conducive to pumping, thereby ensuring pumping efficiency.

[0007] The technical scheme of the present invention is: a pumping slag discharge device for a long-distance rectangular jacking pipe, comprising a stirring assembly and a pumping assembly, wherein the stirring assembly is arranged below the discharge port of a spiral excavator, the pumping assembly comprises a slag pump and a pumping pipeline, the slag pump is arranged below the discharge port of the stirring assembly, the feed port of the slag pump is connected to the discharge port of the stirring assembly, the discharge port of the slag pump is connected to the pumping pipeline, and the outlet of the pumping pipeline is arranged in a slag pool; it also comprises a grouting assembly and a plurality of drag reduction rings; The grouting assembly comprises a first grouting mechanism and a second grouting mechanism; The first grouting mechanism comprises a first slurry mixing barrel, a first grouting pump and a first grouting pipe, wherein the first slurry mixing barrel is provided with a secondary improved slurry, one end of the first grouting pump is connected to the discharge port of the first slurry mixing barrel, and the other end is connected to the first grouting pipe, and the discharge port of the first grouting pipe is provided in the stirring assembly; The second grouting mechanism comprises a second slurry mixing barrel, a second grouting pump, a second grouting pipe, a plurality of grouting branches and a plurality of valves. The second slurry mixing barrel is provided with a drag reducing slurry. One end of the second grouting pump is connected to the discharge port of the second slurry mixing barrel, and the other end is connected to the second grouting pipe. The second grouting pipe is provided with a plurality of grouting branches, and the valve is provided on the grouting branch. The drag reducing ring is arranged on the pumping pipeline, and the drag reducing ring is provided with an inner channel. Both ends of the drag reducing ring are connected to the pumping pipeline through pipe joints; the outer wall of the drag reducing ring is provided with a slurry inlet, and a circle of inner bosses is provided in the middle pipe wall of the drag reducing ring, and a circle of annular grouting channels is provided in the inner bosses, and a plurality of axial grouting holes connected to the annular grouting channels are opened on the inner bosses toward the output direction, and the slurry inlet is connected to the grouting branch pipe.

[0008] Preferably, the cross section of the inner boss is a right-angled trapezoid, the end facing the inlet is a sloped surface, the end facing the outlet is a right-angled step surface, and the slurry inlet is opened on the right-angled step surface facing the outlet; The inner channel is divided into an inlet section, a bell section, a neck section and an outlet section by an inner boss. The front end of the inlet section is connected to the outlet of the front-stage pumping pipeline, the large mouth of the bell section at the end of the inlet section is connected, the small mouth of the bell section is connected to the front end of the neck section, the end of the neck section is connected to the front end of the outlet section, and the end of the outlet section is connected to the inlet of the rear-stage pumping pipeline.

[0009] Preferably, a plurality of capillaries are provided in the inner boss, one end of the capillaries is connected to the annular grouting channel, and the other end is connected to the slope of the inner boss.

[0010] Preferably, it also includes a drag-reducing slurry flow regulating device, which includes a density measuring device, an integrator controller and a plurality of micro-electrically controlled valves; The density measuring device is electrically connected to the integrator controller, and the second grouting pump is electrically connected to the integrator controller; The axial grouting hole is provided with a radially arranged mounting hole, the micro-electrically controlled valve is arranged in the mounting hole, and the micro-electrically controlled valve is electrically connected to the integrating controller.

[0011] Preferably, the stirring assembly includes a stirring bucket, a motor and a spiral stirring rod. The spiral stirring rod is arranged in the stirring bucket. The spiral stirring rod is equipped with a plurality of stirring blades driven by the motor. A support is also provided under the stirring bucket, and an obstacle clearance port is provided on the side of the stirring bucket.

[0012] Preferably, a vibrating screen is also provided on the upper portion of the feed inlet of the slag pump.

[0013] Preferably, a relay pump is provided on the pumping pipeline.

[0014] Preferably, the drag-reducing slurry comprises bentonite, water and additives, and the additives are polyacrylamide, carboxymethyl cellulose, a foaming agent and soda ash.

[0015] Preferably, the density measuring device is an online density measuring instrument, and the online density measuring instrument is arranged at the inlet section of the drag reduction ring.

[0016] A working method of a pumping slag discharge device for a long-distance rectangular jacking pipe is also provided, comprising the following steps: S1. Before the pipe jacking machine is driven, prepare the ground soil pool, install the grouting components, pumping pipeline and drag reduction ring; S2, the pipe jacking machine starts to advance, a stirring assembly is installed in the pipe jacking channel, and the first grouting mechanism is connected, and clean water and improved materials are added into the first grout mixing barrel to mix the secondary improved slurry; S3, the pipe jacking machine pushes in and discharges soil at the same time. The soil cut off the tunnel face is transported to the mixing assembly through the spiral excavator after the first improvement in the soil bin to mix the slag. At the same time, the first grouting pump is turned on to inject the secondary improvement slurry into the mixing assembly for secondary improvement of the slag. S4, the slag after secondary improvement is output from the discharge port of the mixing component, fed from the feed port of the slag pump, and then pumped to the ground slag pool through the pumping pipeline system; S5, adding drag-reducing slurry into the second slurry mixing barrel, starting the second grouting pump, and injecting the drag-reducing slurry into the pumping pipeline through the drag-reducing ring; S6. When the pumping efficiency of the slag pump is insufficient as the jacking distance increases, a relay pump is added between the pumping pipelines to increase the pumping pressure and pumping efficiency.

[0017] The present invention has the following technical effects: (1) The slag discharge device and slag discharge method have a simple equipment structure, the slag transportation process is safer and more convenient, the transportation efficiency is higher, the working space occupancy rate in the jacking channel is small, and the slag discharge efficiency of the jacking construction can be effectively improved, which is 2-3 times higher than the existing technology; (2) Use improved materials to improve the soil for a second time, further improving its plasticity, fluidity, and workability, as well as making it more pumpable, making it more suitable for long-distance pipe jacking in clay, silt, gravel, gravel, soft rock and other strata, with better stratum adaptability and stronger versatility; (3) In case of large jacking pipe section requiring large pumping volume and long jacking distance requiring long pumping distance, several drag reducing devices are installed on the pumping pipeline to reduce the pumping resistance of the slag, further improve the pumping efficiency and adapt to long-distance slag transportation; (4) The improved material and soil mix ratio is determined based on experiments. When transporting soil for long-distance pipe jacking construction, the process of jacking one pipe section is continuous, which can greatly improve the jacking efficiency, shorten the construction period, and reduce the project cost. (5) It replaces the traditional horizontal and vertical transportation method of slag using small cars, which improves efficiency, saves lifting costs, and avoids the safety risks of lifting transportation; (6) The slag that is pumped to the ground after secondary improvement can be used as sandbags for back pressure loading in foundation pits and slope projects, or sandbags for flood control and drainage, which is green and environmentally friendly; (7) A drag-reducing slurry flow regulating device is provided to control the injection amount of the drag-reducing slurry according to the real-time density of the slurry, which can effectively control the cost; The present invention proposes control and improvement measures for the "phase change" of the slag, and innovatively proposes control measures for the "phase change" of the slag (i.e., the change from the conventional granular "solid" to the "liquid" with plasticity, fluidity and workability). Through two slurries with different properties, the change of the slag properties is achieved, and the fluidity is improved by cooperating with the drag reduction device. The present invention greatly improves the construction efficiency, can adapt to different stratum conditions, and realizes the operation of efficient construction of long-distance earth pressure balance rectangular jacking pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall operating diagram of the present invention, Figure 2 is a side cross-sectional view of the drag reduction ring. Figure 3 yes Figure 2 Sectional view along the AA direction, Figure 4 is a side sectional view of the stirring assembly, Figure 5 This is a top view of the stirring assembly. Figure 6 is a side cross-sectional view of the drag reduction ring in Example 2, Figure 7 is a side cross-sectional view of the drag reduction ring in Example 3, Figure 1 is a spiral excavator. 2 is a stirring assembly, 21 is a mixing bucket, 22 is a motor, 23 is a spiral stirring rod, 3 is a pumping assembly, 31 is a slag pump, 32 is a pumping pipeline, 33 is a vibrating screen, 34 is a relay pump, 4 is a grouting assembly, 41 is a first grouting mechanism, 411 is a first grouting barrel, 412 is a first grouting pump, 413 is a first grouting pipe, 42 is a second grouting mechanism, 421 is a second grouting barrel, 422 is a second grouting pump, 423 is a second grouting pipe, 424 is a grouting branch pipe, 425 is a valve, 5 is a drag reduction ring, 51 is an inner channel, 511 is an inlet section, 512 is a trumpet section, 513 is a necking section, 514 is an outlet section, 52 is an annular grouting channel, 53 is an axial grouting hole, 54 is a slurry inlet, 55 is an inner boss, 551 is a capillary tube, 56 is a drag reduction slurry flow regulating device, 561 is a density measuring device, 562 is a micro-electrically controlled valve, 6 is the slag pool. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "vertical", "cross", "inside", "outside", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] Example 1 Figure 1The present invention discloses a pumping slag discharging device for a long-distance rectangular jacking pipe, comprising a stirring assembly 2 and a pumping assembly 3, and also comprising a grouting assembly 4 and a plurality of drag reducing rings 5; The stirring assembly 2 is arranged below the discharge port of the spiral excavator 1. The spiral excavator 1 is an existing device, and its specific structure will not be described in detail. The pumping assembly 3 includes a slag pump 31 and a pumping pipeline 32. The slag pump 31 is arranged below the discharge port of the stirring assembly 2. The feed port of the slag pump 31 is connected to the discharge port of the stirring assembly 2. The discharge port of the slag pump 31 is connected to the pumping pipeline 32. The outlet of the pumping pipeline 32 is arranged in the slag pool 6. The grouting assembly 4 includes a first grouting mechanism 41 and a second grouting mechanism 42; The first grouting mechanism 41 includes a first slurry mixing barrel 411, a first grouting pump 412 and a first grouting pipe 413. The first slurry mixing barrel 411 is provided with secondary improved slurry. One end of the first grouting pump 412 is connected to the discharge port of the first slurry mixing barrel 411, and the other end is connected to the first grouting pipe 413. The discharge port of the first grouting pipe 413 is provided in the stirring assembly 2. The second grouting mechanism 42 includes a second slurry mixing barrel 421, a second grouting pump 422, a second grouting pipe 423, a plurality of grouting branches 424 and a plurality of valves 425. The second slurry mixing barrel 421 is provided with a drag reducing slurry. One end of the second grouting pump 422 is connected to the discharge port of the second slurry mixing barrel 421, and the other end is connected to the second grouting pipe 423. The second grouting pipe 423 is provided with a plurality of grouting branches 424, and valves 425 are provided on the grouting branches. The drag reducing ring 5 is arranged on the pumping pipeline 32, and the drag reducing ring 5 is provided with an inner channel 51. Both ends of the drag reducing ring 5 are connected to the pumping pipeline 32 through pipeline joints; the outer wall of the drag reducing ring 5 is provided with a slurry inlet 54, and the middle pipe wall of the drag reducing ring 5 is provided with a circle of inner bosses 55, see Figure 3 A circle of annular grouting channel 52 is arranged inside the inner boss 55 , and a plurality of axial grouting holes 53 connected to the annular grouting channel 52 are opened in the inner boss 55 toward the output direction, and the grout inlet 54 is connected to the grouting branch pipe 424 .

[0022] In this embodiment, the cross-section of the inner boss 55 is a right-angled trapezoid, with a sloped surface at one end facing the inlet and a right-angled step surface at the other end facing the outlet, and the slurry inlet 54 is provided on the right-angled step surface facing the outlet.

[0023] See also Figure 2The inner channel 51 is divided into an inlet section 511, a trumpet section 512, a necking section 513 and an outlet section 514 by an inner boss 55. The front end of the inlet section 511 is connected to the outlet of the front-stage pumping pipeline 32, the large mouth of the trumpet section 512 at the end of the inlet section 511 is connected, the small mouth of the trumpet section 512 is connected to the front end of the necking section 513, the end of the necking section 513 is connected to the front end of the outlet section 514, and the end of the outlet section 514 is connected to the inlet of the rear-stage pumping pipeline 32.

[0024] The inner channel of this shape can produce a Venturi effect to accelerate the flow, and a slurry inlet is arranged in the outlet direction to facilitate uniform and sufficient mixing with the medium.

[0025] See also Figure 4 and Figure 5 The stirring assembly includes a stirring bucket 21, a motor 22 and a spiral stirring rod 23. The stirring assembly 21 is used to stir and re-improve the slag transported by the spiral excavator 1, and improve it into a paste-like slag. The spiral stirring rod 23 is arranged in the stirring bucket 21, and a plurality of stirring blades are installed on the spiral stirring rod 23 and driven by the motor; a plurality of supports and discharge ports are also arranged below the stirring bucket 21; an obstacle clearing port is arranged on the side of the stirring bucket, which is used to clear large-sized pebbles and obstacles that fall from the screw machine port, and obstacles that are not conducive to pumping.

[0026] In this embodiment, a vibrating screen 33 is further provided on the upper portion of the feed port of the slag pump 31 to further filter out large-size pebbles and gravels, so that the slag with low density can smoothly enter the slag pump.

[0027] In this embodiment, a relay pump 34 is provided on the pumping pipeline 32 .

[0028] In this embodiment, the pumping pipeline 32 system is divided into a straight section and a transition section. The straight section is arranged inside the top pipe channel, the wall of the working well and the ground, and the transition section is arranged at the connection of the above three. The straight section is spliced ​​with steel pipes, and the transition section is connected with rubber pipes.

[0029] In this embodiment, the drag reduction slurry comprises bentonite, water and additives, wherein the additives are polyacrylamide, carboxymethyl cellulose, foaming agent and soda ash. Those skilled in the art may also select other organic polymer lubricants that do not chemically react with the secondary modified slurry and mix with water.

[0030] In this embodiment, the working method of the slag discharge device for long-distance rectangular jacking pipe pumping includes the following steps: S1. Before the pipe jacking machine is driven, the ground soil pool is prepared, and the grouting assembly 4 and the pumping pipeline 32 are installed; S2, the pipe jacking machine starts to advance, the stirring assembly 2 is installed in the pipe jacking channel, and the first grouting mechanism 41 is connected, and clean water and improved materials are added into the first slurry mixing barrel 411 to mix the secondary improved slurry; S3, the pipe jacking machine pushes in and discharges soil at the same time, and the soil cut off the tunnel face is transported to the mixing assembly 2 through the spiral excavator 1 after the first improvement in the soil bin to mix the slag, and at the same time, the first grouting pump 412 is turned on to inject the secondary improvement slurry into the mixing assembly 2 for secondary improvement of the slag; S4, the slag after the secondary improvement is output from the discharge port of the mixing assembly 2, fed from the feed port of the slag pump 31, and then pumped to the ground slag pool 6 through the pumping pipeline 32 system; S5. Install the drag reducing ring 5 at the joint position in the middle of the pumping pipeline 32, connect the second grouting mechanism 42, add the drag reducing slurry into the second slurry mixing barrel 421, start the second grouting pump 422, and inject the drag reducing slurry into the pumping pipeline 32.

[0031] S6. When the pumping efficiency of the slag pump is insufficient as the jacking distance increases, a relay pump 34 can be added between the pumping pipelines 32 to increase the pumping pressure and pumping efficiency.

[0032] The modified materials are used to improve the slag for a second time, which further improves the plasticity, fluidity and workability of the slag, and makes it have good pumpability, making it more suitable for long-distance pipe jacking construction in clay, silt, gravel, gravel, soft rock and other strata, with better stratum adaptability and stronger versatility; In view of the situation that the large cross-section of the jacking pipe requires a large pumping volume, the long jacking distance requires a long pumping distance, several drag reducing devices are installed on the pumping pipeline to reduce the pumping resistance of the slag, further improve the pumping efficiency and adapt to long-distance slag transportation.

[0033] Example 2 See also Figure 6 The difference between this embodiment and embodiment 1 is that a plurality of capillaries 551 are provided in the inner boss 55 , one end of the capillaries 551 is located in the annular grouting channel 52 , and the other end is located on the slope surface of the inner boss 55 .

[0034] This structure allows the slurry to be wrapped in the drag-reducing slurry, allowing it to flow more smoothly in the horn section 512 .

[0035] Example 3 See also Figure 7 In this embodiment, a drag reduction slurry flow regulating device 56 is included, and the drag reduction slurry flow regulating device 56 includes a density measuring device 561, an integrating controller and a plurality of micro-electrically controlled valves 562; the flow integrating controller is a device for flow integrating control, which is a conventional device, and the specific working principle and installation method are not described in detail. The density measuring device 561 is electrically connected to the integrator controller. In this embodiment, the density measuring device 561 is an online density measuring instrument, which is arranged at the inlet section 511 of the drag reduction ring 51 and is a conventional measuring instrument. The specific working principle and installation method are not described in detail.

[0036] The second grouting pump 422 is electrically connected to the integrating controller; The axial grouting hole 53 is provided with a radially arranged mounting hole, and the micro-electrically controlled valve 562 is arranged in the mounting hole. The micro-electrically controlled valve 562 is electrically connected to the integrator controller.

[0037] In this embodiment, the density measuring device 561 measures the density of the slurry in real time and feeds it back to the integrative controller. The integrative controller can control the output flow of the second grouting pump 422 according to the density of the slurry, thereby controlling the injection amount of the drag reducing slurry and closing a corresponding number of axial grouting holes 53. After the injection amount of the drag reducing slurry is reduced, the outflow rate of the drag reducing slurry from the remaining axial grouting holes 53 is still sufficient to ensure that the drag reducing slurry and the slurry are fully mixed.

[0038] The structure in this embodiment can control the injection amount of the drag-reducing slurry according to the real-time density of the slurry, thereby effectively controlling the cost.

[0039] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A pumping slag discharge device for a long-distance rectangular jacking pipe, comprising a stirring assembly and a pumping assembly, wherein the stirring assembly is arranged below the discharge port of the spiral excavator, the pumping assembly comprises a slag pump and a pumping pipeline, the slag pump is arranged below the discharge port of the stirring assembly, the feed port of the slag pump is connected to the discharge port of the stirring assembly, the discharge port of the slag pump is connected to the pumping pipeline, and the outlet of the pumping pipeline is arranged in a slag pool; Its characteristics are: It also includes a grouting assembly and a number of drag reduction rings; The grouting assembly comprises a first grouting mechanism and a second grouting mechanism; The first grouting mechanism comprises a first slurry mixing barrel, a first grouting pump and a first grouting pipe, wherein the first slurry mixing barrel is provided with a secondary improved slurry, one end of the first grouting pump is connected to the discharge port of the first slurry mixing barrel, and the other end is connected to the first grouting pipe, and the discharge port of the first grouting pipe is provided in the stirring assembly; The second grouting mechanism comprises a second slurry mixing barrel, a second grouting pump, a second grouting pipe, a plurality of grouting branches and a plurality of valves. The second slurry mixing barrel is provided with a drag reducing slurry. One end of the second grouting pump is connected to the discharge port of the second slurry mixing barrel, and the other end is connected to the second grouting pipe. The second grouting pipe is provided with a plurality of grouting branches, and the valve is provided on the grouting branch. The drag reducing ring is arranged on the pumping pipeline, and the drag reducing ring is provided with an inner channel. Both ends of the drag reducing ring are connected to the pumping pipeline through pipe joints; the outer wall of the drag reducing ring is provided with a slurry inlet, and a circle of inner bosses is provided in the middle pipe wall of the drag reducing ring, and a circle of annular grouting channels is provided in the inner bosses, and a plurality of axial grouting holes connected to the annular grouting channels are opened on the inner bosses toward the output direction, and the slurry inlet is connected to the grouting branch pipe.

2. A slag removal pumping device for a long distance rectangular jacking pipe according to claim 1, characterized in that: The cross section of the inner boss is a right-angled trapezoid, one end facing the inlet is a sloped surface, and the other end facing the outlet is a right-angled step surface, and the slurry inlet is opened on the right-angled step surface facing the outlet; The inner channel is divided into an inlet section, a bell section, a neck section and an outlet section by an inner boss. The front end of the inlet section is connected to the outlet of the front-stage pumping pipeline, the large mouth of the bell section at the end of the inlet section is connected, the small mouth of the bell section is connected to the front end of the neck section, the end of the neck section is connected to the front end of the outlet section, and the end of the outlet section is connected to the inlet of the rear-stage pumping pipeline.

3. A slag removal pumping device for a long distance rectangular jacking pipe according to claim 2, characterized in that: A plurality of capillaries are arranged in the inner boss, one end of the capillaries is connected to the annular grouting channel, and the other end is connected to the slope surface of the inner boss.

4. A slag removal device for a long-distance rectangular jacking pipe according to claim 2 or 3, characterized in that: It also includes a drag-reducing slurry flow regulating device, which includes a density measuring device, an integrating controller and a plurality of micro-electrically controlled valves; The density measuring device is electrically connected to the integrator controller, and the second grouting pump is electrically connected to the integrator controller; The axial grouting hole is provided with a radially arranged mounting hole, the micro-electrically controlled valve is arranged in the mounting hole, and the micro-electrically controlled valve is electrically connected to the integrating controller.

5. The slag removal device for long-distance rectangular jacking pipe according to claim 1 is characterized in that: The stirring assembly includes a stirring bucket, a motor and a spiral stirring rod. The spiral stirring rod is arranged in the stirring bucket. A plurality of stirring blades are installed on the spiral stirring rod and driven by the motor. A support is also arranged under the stirring bucket, and an obstacle clearance port is arranged on the side of the stirring bucket.

6. The slag pumping device for long-distance rectangular jacking pipe according to claim 1 is characterized in that: A vibrating screen is also provided on the upper part of the feed inlet of the slag pump.

7. The slag removal device for long-distance rectangular jacking pipe according to claim 1 is characterized in that: A relay pump is arranged on the pumping pipeline.

8. The slag removal device for long-distance rectangular jacking pipe according to claim 1 is characterized in that: The drag reduction slurry comprises bentonite, water and additives, wherein the additives are polyacrylamide, carboxymethyl cellulose, a foaming agent and soda ash.

9. The slag pumping device for long-distance rectangular jacking pipe according to claim 4 is characterized in that: The density measuring device is an online density measuring instrument, and the online density measuring instrument is arranged at the inlet section of the drag reducing ring.

10. A method for operating a slag pumping device for a long-distance rectangular jacking pipe according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Before the pipe jacking machine is driven, prepare the ground soil pool, install the grouting components, pumping pipeline and drag reduction ring; S2, the pipe jacking machine starts to advance, a stirring assembly is installed in the pipe jacking channel, and the first grouting mechanism is connected, and clean water and improved materials are added into the first grout mixing barrel to mix the secondary improved slurry; S3, the pipe jacking machine pushes in and discharges soil at the same time. The soil cut off the tunnel face is transported to the mixing assembly through the spiral excavator after the first improvement in the soil bin to mix the slag. At the same time, the first grouting pump is turned on to inject the secondary improvement slurry into the mixing assembly for secondary improvement of the slag. S4, the slag after secondary improvement is output from the discharge port of the mixing component, fed from the feed port of the slag pump, and then pumped to the ground slag pool through the pumping pipeline system; S5, adding drag-reducing slurry into the second slurry mixing barrel, starting the second grouting pump, and injecting the drag-reducing slurry into the pumping pipeline through the drag-reducing ring; S6. When the pumping efficiency of the slag pump is insufficient as the jacking distance increases, a relay pump is added between the pumping pipelines to increase the pumping pressure and pumping efficiency.

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