Slurry circulating device of large-section slurry balance type push bench

Abstract

The utility model discloses a slurry circulating device of a large-section slurry balance type push bench. The slurry circulating device comprises a slurry inlet pump and a slurry discharge pump which are communicated with a ground slurry treatment system, the first conveying pipe is arranged at the output end of the slurry inlet pump; the first valve is arranged on the first conveying pipe; the slurry inlet pipe and the slurry discharge pipe are communicated with the pipe push bench muddy water bin; the slurry inlet valve group is arranged on the slurry inlet pipe; the second conveying pipe is arranged at the input end of the slurry discharging pump; the second valve is arranged on the second conveying pipe; the third valve is arranged on the slurry discharging pipe; the spiral conveyer is arranged in the pipe jacking machine; the screw conveyor pipeline is arranged on the screw conveyor; and the screw conveyor valve group is arranged on the screw conveyor pipeline. According to the technical scheme, the flowability of the slurry in the slurry bin of the pipe jacking machine can be enhanced, ground subsidence can be conveniently controlled, the slurry and excavated muck are fully mixed, pressure fluctuation in the slurry bin is reduced, and the slurry pressure balance stability and the gushing-facing risk resistance are improved.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel excavation slurry balance, and more specifically, to a slurry circulation device for a large-section slurry balance type pipe jacking machine. Background Art

[0002] Pipe jacking construction is a trenchless construction method, which belongs to a pipeline burial construction technology with no excavation or less excavation. Pipe jacking construction is to use the jacking force generated by the jacking equipment in the working pit to overcome the friction between the pipeline and the surrounding soil, push the pipeline into the soil according to the designed slope, and transport the soil away. After one section of the pipe is pushed into the soil layer, the second section of the pipe is pushed in. The principle is to use the thrust of the main jacking cylinder and the pipeline room, relay room, etc. to push the tool pipe or tunnel boring machine from the working pit through the soil layer to the receiving pit and then lift it up. The pipeline follows the tool pipe or tunnel boring machine and is buried between the two pits.

[0003] At present, with the development of underground space development projects, underground pedestrian passages and subway entrances and exits are increasingly using high-effective-area rectangular pipe jacking construction. At the same time, in order to overcome complex strata such as high water pressure and easy gushing, a mud-water balance rectangular pipe jacking construction method has been proposed. However, the existing large-section mud-water balance rectangular pipe jacking machine, because the slurry inlet and outlet are all set at the bottom of the mud-water bin and are close to each other, on the one hand, it will form over-discharge at the bottom of the excavation surface, causing the upper soil to collapse; on the other hand, it will cause the mud in the bin to mix unevenly with the excavated soil, causing large fluctuations in the mud-water pressure in the bin, making it difficult to build mud-water pressure balance, resulting in the large-section mud-water rectangular pipe jacking machine not being ideal in controlling ground settlement.

[0004] Therefore, how to provide a mud circulation device for a large-section mud-water balance pipe jacking machine to fully mix the mud with the excavated soil, reduce the pressure fluctuation in the mud-water bin, improve the stability of the mud-water pressure balance and the ability to resist the risk of gushing has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, the present application provides a large-section mud-water balance type pipe jacking machine mud circulation device, which can enhance the fluidity of the mud in the mud and water bin of the pipe jacking machine, facilitate the control of ground subsidence, make the mud and excavated debris fully mixed, reduce the pressure fluctuation in the mud and water bin, and improve the stability of the mud and water pressure balance and the risk resistance ability in the face of gushing.

[0006] The technical solutions provided by this application are as follows:

[0007] The present application provides a mud circulation device for a large-section mud-water balance type pipe jacking machine, comprising: a ground mud-water treatment system; a slurry feed pump and a slurry discharge pump connected to the ground mud-water treatment system; a first delivery pipe arranged at the output end of the slurry feed pump; a first valve arranged on the first delivery pipe; a slurry feed pipe having one end connected to the first delivery pipe and the other end connected to the slurry feed pipe of the upper chamber in the mud-water bin of the pipe jacking machine; a slurry feed valve group arranged on the slurry feed pipe; a second delivery pipe arranged at the input end of the slurry discharge pump; a second valve arranged on the second delivery pipe; a slurry discharge pipe having one end connected to the second delivery pipe and the other end connected to the slurry discharge pipe of the bottom chamber in the mud-water bin of the pipe jacking machine; a third valve arranged on the slurry discharge pipe; a screw conveyor arranged in the pipe jacking machine; a screw machine pipeline arranged on the screw conveyor and connected to the slurry feed pipe and the slurry discharge pipe; and a screw machine valve group arranged on the screw machine pipeline.

[0008] Furthermore, in a preferred embodiment of the present invention, the slurry inlet pipe comprises:

[0009] Upper slurry inlet pipe;

[0010] One end of the upper slurry inlet pipe is connected to the first conveying pipe, and the other end is connected to the upper chamber of the mud and water bin of the pipe jacking machine;

[0011] A middle-layer pulp inlet pipe arranged in parallel with the upper-layer pulp inlet pipe;

[0012] One end of the middle-layer slurry inlet pipe is connected to the first conveying pipe, and the other end is connected to the middle-layer chamber of the mud and water bin of the pipe jacking machine.

[0013] Furthermore, in a preferred embodiment of the present invention, the slurry inlet valve group includes:

[0014] A fourth valve disposed on the upper slurry inlet pipe;

[0015] A fifth valve is arranged on the middle-layer slurry inlet pipe.

[0016] Furthermore, in a preferred embodiment of the present invention, the spiral machine pipeline comprises:

[0017] One end is connected to the slurry inlet pipe, and the other end is connected to the screw conveyor slurry inlet pipe of the screw conveyor;

[0018] One end is connected to the slurry discharge pipe, and the other end is connected to the screw conveyor slurry discharge pipe.

[0019] Furthermore, in a preferred embodiment of the present invention, the screw machine valve group includes:

[0020] A sixth valve disposed on the slurry inlet pipe of the screw machine;

[0021] A seventh valve is arranged on the slurry discharge pipe of the screw machine.

[0022] Furthermore, in a preferred embodiment of the present invention, the mud circulation device of the large-section mud-water balance pipe jacking machine further comprises:

[0023] A bypass pipe is disposed between the first delivery pipe and the second delivery pipe and is in communication with the first delivery pipe and the second delivery pipe.

[0024] Furthermore, in a preferred embodiment of the present invention, the bypass pipeline comprises:

[0025] a first bypass pipe having one end connected to the first delivery pipe and the other end connected to the second delivery pipe;

[0026] an eighth valve disposed on the first bypass pipe;

[0027] a second bypass pipe having one end connected to the first delivery pipe and the other end connected to the second delivery pipe;

[0028] a ninth valve disposed on the second bypass pipe;

[0029] The first bypass pipe and the second bypass pipe are arranged to cross each other.

[0030] Furthermore, in a preferred embodiment of the present invention, a first connection end is provided at a connection point between the first bypass pipe and the first delivery pipe, and a second connection end is provided at a connection point between the second bypass pipe and the first delivery pipe;

[0031] The first valve is disposed between the first connection end and the second connection end;

[0032] A third connection end is provided at the connection between the first bypass pipe and the second delivery pipe, and a fourth connection end is provided at the connection between the second bypass pipe and the second delivery pipe;

[0033] The second valve is disposed between the third connection end and the fourth connection end.

[0034] Furthermore, in a preferred embodiment of the present invention, the mud circulation device of the large-section mud-water balance pipe jacking machine further comprises:

[0035] One end is connected to the output end of the slurry inlet pump, and the other end is connected to the slurry collecting and changing pipe device at the output end of the slurry discharge pump.

[0036] Furthermore, in a preferred embodiment of the present invention, the slurry collecting and tube changing device comprises:

[0037] Slurry collection tank;

[0038] One end is connected to the pulp collection pool, and the other end is connected to the first pulp collection pipe at the output end of the pulp feed pump;

[0039] One end is connected to the pulp collection pool, and the other end is connected to the second pulp collection pipe at the output end of the pulp discharge pump.

[0040] The utility model provides a mud circulation device for a large-section mud-water balance type pipe jacking machine, comprising: a ground mud-water treatment system; a slurry feed pump and a slurry discharge pump connected to the ground mud-water treatment system; a first delivery pipe arranged at the output end of the slurry feed pump; a first valve arranged on the first delivery pipe; a slurry feed pipe having one end connected to the first delivery pipe and the other end connected to the slurry feed pipe of the upper chamber in the mud-water bin of the pipe jacking machine; a slurry feed valve group arranged on the slurry feed pipe; a second delivery pipe arranged at the input end of the slurry discharge pump; a second valve arranged on the second delivery pipe; a slurry discharge pipe having one end connected to the second delivery pipe and the other end connected to the slurry discharge pipe of the bottom chamber in the mud-water bin of the pipe jacking machine; a third valve arranged on the slurry discharge pipe; a screw conveyor arranged in the pipe jacking machine; a screw machine pipeline arranged on the screw conveyor and connected to the slurry feed pipe and the slurry discharge pipe; and a screw machine valve group arranged on the screw machine pipeline.Among them, in the mud circulation device of the large-section mud-water balance type pipe jacking machine described in the utility model, the main frame of the system is composed of the ground mud and water treatment system, the first valve, the first conveying pipe, the slurry inlet pipe, the slurry inlet valve group, the second conveying pipe, the second valve, the slurry discharge pipe, the third valve, the screw conveyor, the screw machine pipeline, and the screw machine valve group; the ground mud and water treatment system is used to prepare mud slurry, and the first conveying pipe, the slurry inlet pipe, the second conveying pipe, the slurry discharge pipe and the screw machine pipeline are combined into the main pipeline in the system, and the slurry inlet pump, the slurry discharge pipe and the screw machine pipeline are installed on the main pipeline The pump can realize the circulation of the modulated mud slurry from the ground mud and water treatment system to the mud and water bin of the pipe jacking machine, and the first valve, the second valve, the third valve and the screw machine valve group are combined into the main control valve group in the circulation system, which can control the on and off of different pipelines according to the different working geology; when the pipe jacking machine is excavating, the mud circulation system is in the excavation mode, and the direct discharge or screw machine discharge can be selected according to the formation conditions: if the formation is relatively stable, the mud in the mud and water bin has good fluidity, and the mud carries slag smoothly, direct discharge can be used. At this time, by adjusting the valve on and off, the mud slurry passes through the slurry feed pump and enters the middle and upper chambers of the pipe jacking machine to be fully mixed with the slag, and then uses the slurry discharge pump to discharge it from the slurry discharge pipe at the bottom of the mud and water bin and flow back to the ground mud and water treatment system. Since the slurry discharge pipe is connected with the bottom of the mud and water bin, a large-scale mud flow can be formed in the vertical direction of the mud and water bin, which can enhance the fluidity of the mud in the mud and water bin, make the mud in the mud and water bin evenly distributed, reduce the pressure fluctuation of the face, and stabilize the excavation of the soil layer; when the geology of the pipe jacking machine operation is complex, the mud circulation system can use a spiral machine to discharge Slurry, at this time, by adjusting the valve on and off, the mud slurry passes through the slurry pump and enters the middle and upper chambers of the pipe jacking machine to be fully mixed with the slag. Then, the mud slurry and the excavated slag enter the screw conveyor together, and after the screw conveyor flushes the mud and further dilutes it, it is sent to the ground by the slurry discharge pump. The screw of the screw machine directly extends into the mud and water bin, which can directly bring out the slag accumulated in the mud and water bin. At the same time, a soil plug effect can be formed inside the screw machine. When gushing occurs, the gushing mud can be discharged to avoid destroying the mud and water pressure balance of the face, thereby effectively controlling surface subsidence. It can be seen that the technical solution provided by the utility model, compared with the prior art, can enhance the fluidity of the mud in the mud and water bin of the pipe jacking machine, facilitate the control of ground subsidence, fully mix the mud with the excavated slag, reduce the pressure fluctuation in the mud and water bin, and improve the stability of the mud and water pressure balance and the ability to resist risks in the face of gushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A schematic diagram of the structure of the mud circulation device of the large-section mud-water balance type pipe jacking machine provided in the embodiment of the utility model;

[0043] Figure 2 A schematic diagram of the structure of the spiral machine pipeline provided in an embodiment of the utility model;

[0044] Figure 3 A schematic diagram of the structure of the bypass pipeline provided in an embodiment of the utility model;

[0045] Figure 4 A schematic diagram of the structure of the slurry collecting and tube changing device provided in an embodiment of the utility model;

[0046] Figure 5 A schematic block diagram of the switching of the working modes of the mud circulation device of the large-section mud-water balance type pipe jacking machine provided in an embodiment of the utility model;

[0047] Figure 6 A schematic diagram of the installation positions of the slurry inlet pipe and the slurry discharge pipe provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of this application.

[0049] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0050] It should be understood that the terms "length", "width", "up", "down", "front", "back", "first", "second", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0052] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0053] like Figures 1 to 6 As shown, the mud circulation device of the large-section mud-water balance type pipe jacking machine provided in the embodiment of the present application includes: a ground mud and water treatment system 1, a first valve 5, a first delivery pipe 4, a slurry inlet pipe, a slurry inlet valve group, a second delivery pipe 10, a second valve 11, a slurry discharge pipe 12, a third valve 13, a screw conveyor 14, a screw machine pipeline 15 and a screw machine valve group.

[0054] The utility model provides a mud circulation device for a large-section mud-water balance type pipe jacking machine, which specifically comprises: a ground mud-water treatment system 1; a slurry feed pump 2 and a slurry discharge pump 3 connected to the ground mud-water treatment system 1; a first conveying pipe 4 arranged at the output end of the slurry feed pump 2; a first valve 5 arranged on the first conveying pipe 4; a slurry feed pipe having one end connected to the first conveying pipe 4 and the other end connected to the slurry feed pipe of the upper chamber in the mud-water bin of the pipe jacking machine; a slurry feed valve group arranged on the slurry feed pipe; a second conveying pipe 10 arranged at the input end of the slurry discharge pump 3; a second valve 11 arranged on the second conveying pipe 10; a slurry discharge pipe 12 having one end connected to the second conveying pipe 10 and the other end connected to the slurry discharge pipe 12 of the bottom chamber of the mud-water bin of the pipe jacking machine; a third valve 13 arranged on the slurry discharge pipe 12; a screw conveyor 14 arranged in the pipe jacking machine; a screw machine pipeline 15 arranged on the screw conveyor 14 and connected to the slurry feed pipe and the slurry discharge pipe 12; and a screw machine valve group arranged on the screw machine pipeline 15. Compared with the prior art, the technical solution provided by the utility model can enhance the fluidity of mud in the mud and water bin of the pipe jacking machine, facilitate the control of ground settlement, fully mix the mud with excavated debris, reduce the pressure fluctuation in the mud and water bin, and improve the stability of mud and water pressure balance and the ability to resist the risk of gushing.

[0055] The technical solution of the utility model is specifically described below in conjunction with the embodiments:

[0056] Specifically, in an embodiment of the utility model, the slurry inlet pipe includes: an upper slurry inlet pipe 6; one end of the upper slurry inlet pipe 6 is connected to the first conveying pipe 4, and the other end is connected to the upper chamber of the mud and water bin of the pipe jacking machine; a middle slurry inlet pipe 7 is arranged in parallel with the upper slurry inlet pipe 6; one end of the middle slurry inlet pipe 7 is connected to the first conveying pipe 4, and the other end is connected to the middle chamber of the mud and water bin of the pipe jacking machine.

[0057] Specifically, in the embodiment of the utility model, the slurry inlet valve group includes: a fourth valve 8 arranged on the upper slurry inlet pipe 6; and a fifth valve 9 arranged on the middle slurry inlet pipe 7.

[0058] Among them, the slurry inlet pipe can be provided with multiple pieces. In the embodiment of the utility model, the slurry inlet pipe is provided with an upper slurry inlet pipe 6 and a middle slurry inlet pipe 7. The fourth valve 8 and the fifth valve 9 are respectively installed on the upper slurry inlet pipe 6 and the middle slurry inlet pipe 7 to control the on-off of the pipeline; the input end of the upper slurry inlet pipe 6 is connected to the first conveying pipe 4, and the output end is connected to the upper and middle chambers of the mud and water bin of the pipe jacking machine to convey mud slurry to the upper chamber; the input end of the middle slurry inlet pipe 7 is connected to the screw machine pipeline 15, and is connected to the first conveying pipe 4 through the screw machine pipeline 15; the output end of the middle slurry inlet pipe 7 is connected to the middle chamber of the mud and water bin of the pipe jacking machine, and conveys mud slurry to the middle chamber through the slurry inlet pump 2.

[0059] Specifically, in an embodiment of the present utility model, the screw machine pipeline 15 includes: a screw machine slurry inlet pipe 15-1 connected to the screw conveyor 14 at one end and connected to the slurry discharge pipe 12 at the other end; a screw machine slurry discharge pipe 15-2 connected to the screw conveyor 14 at one end.

[0060] Specifically, in the embodiment of the utility model, the screw machine valve group includes: a sixth valve 16 arranged on the screw machine slurry inlet pipe 15-1; and a seventh valve 17 arranged on the screw machine slurry discharge pipe 15-2.

[0061] Among them, in the embodiment of the utility model, the screw machine pipeline 15 is set, and when the jacking machine is operating in a complex geological layer, the system can combine the screw conveyor 14 and the screw machine pipeline 15 to perform the screw machine slurry discharge; Figure 2 As shown, the screw machine pipeline 15 is composed of the screw machine slurry inlet pipe 15-1, the sixth valve 16, the screw machine slurry discharge pipe 15-2 and the seventh valve 17; the spiral slurry inlet pipe is connected to the input ends of the upper slurry inlet pipe 6 and the middle slurry inlet pipe 7. In other words, the spiral slurry inlet pipe is connected to the output end of the first conveying pipe 4, and the mud slurry can be input into the screw conveyor 14, while the screw machine slurry discharge pipe 15-2 connects the screw conveyor 14 and the slurry discharge pipe, and the slurry discharge pipe 12 and the screw conveyor 14 can be used to dilute the mud slurry and transfer it back to the ground.

[0062] Specifically, in an embodiment of the utility model, the mud circulation system of the large-section slurry-water balanced pipe jacking machine also includes: a bypass pipe arranged between the first conveying pipe 4 and the second conveying pipe 10 and connected to the first conveying pipe 4 and the second conveying pipe 10.

[0063] Specifically, in an embodiment of the present utility model, the bypass pipe 18 includes: a first bypass pipe 18-1 having one end connected to the first delivery pipe 4 and the other end connected to the second delivery pipe 10; an eighth valve 18-2 arranged on the first bypass pipe 18-1; a second bypass pipe 18-3 having one end connected to the first delivery pipe 4 and the other end connected to the second delivery pipe 10; a ninth valve 18-4 arranged on the second bypass pipe 18-3; the first bypass pipe 18-1 and the second bypass pipe 18-3 are arranged crosswise with each other.

[0064] Among them, in the embodiment of the utility model, the bypass pipe 18 is used to isolate the circulating mud slurry and the mud water tank; Figure 3As shown, the bypass pipe 18 is composed of the first bypass pipe 18-1, the eighth valve 18-2, the second bypass pipe 18-3 and the ninth valve 18-4, and the two are cross-arranged, that is, the connecting end of the first bypass pipe 18-1 and the first conveying pipe 4 is located on the right side of the connecting end of the second bypass pipe 18-3 and the first conveying pipe 4, and the connecting end of the first bypass pipe 18-1 and the second conveying pipe 10 is located on the left side of the connecting end of the second bypass pipe 18-3 and the second conveying pipe 10. The pipelines are cross-arranged between the first conveying pipe 4 and the second conveying pipe 10, which can avoid causing large disturbances to the mud and water tank when switching the slurry discharge form.

[0065] Specifically, in an embodiment of the utility model, a first connection end is provided at the connection between the first bypass pipe 18-1 and the first delivery pipe 4, and a second connection end is provided at the connection between the second bypass pipe 18-3 and the first delivery pipe 4; the first valve 5 is provided between the first connection end and the second connection end; a third connection end is provided at the connection between the first bypass pipe 18-1 and the second delivery pipe 10, and a fourth connection end is provided at the connection between the second bypass pipe 18-3 and the second delivery pipe 10; the second valve 11 is provided between the third connection end and the fourth connection end.

[0066] like Figure 3 As shown, in an embodiment of the utility model, the first valve 5 is arranged on the first delivery pipe 4 between the first connection end and the second connection end; the second valve 11 is arranged on the second delivery pipe 10 between the third connection end and the fourth connection end; the first bypass pipe 18-1 and the second bypass pipe 18-3 are spanned over the first valve 5 and the second valve 11, and the flow direction of the mud slurry in the bypass pipe 18 can be adjusted by controlling the opening and closing of the first valve 5 and the second valve 11.

[0067] Specifically, in an embodiment of the utility model, the mud circulation device of the large-section mud-water balance type pipe jacking machine also includes: a slurry collecting and pipe changing device 19 having one end connected to the output end of the slurry feed pump 2 and the other end connected to the output end of the slurry discharge pump 3 .

[0068] Specifically, in an embodiment of the utility model, the pulp collecting and pipe changing device 19 includes: a pulp collecting pool 19-1; a first pulp collecting pipe 19-2 having one end connected to the pulp collecting pool 19-1 and the other end connected to the output end of the pulp feed pump 2; and a second pulp collecting pipe 19-3 having one end connected to the pulp collecting pool 19-1 and the other end connected to the output end of the pulp discharge pump 3.

[0069] Among them, in the embodiment of the utility model, the slurry collecting and replacing pipe device 19 is used to cut off the mud circulation of the ground mud and water treatment system 1 and the mud circulation device in the pipeline, so as to facilitate the pipe replacement operation, or to perform maintenance and repair of the equipment according to the actual needs on site; Figure 4 As shown, the slurry collecting and pipe changing device 19 is composed of the slurry collecting pool 19-1, the first slurry collecting pipe 19-2 and the second slurry collecting pipe 19-3. When performing maintenance or pipe changing operations, the mud slurry can be transmitted to the slurry collecting pool 19-1 by controlling the opening and closing of the valve, and then transmitted back to the ground by the slurry collecting pool 19-1.

[0070] Specifically, in the embodiment of the present utility model, the slurry inlet pump 2 and the slurry discharge pump 3 are specifically small-flow slurry pumps.

[0071] In the embodiment of the utility model, the mud circulation device can be set in multiple groups to meet the flow requirements of the equipment. The configuration of each system is basically the same and is independently controlled, which can improve the system flow control accuracy and reduce the pressure fluctuation of the mud and water tank.

[0072] Specifically, in an embodiment of the utility model, the working modes of the mud circulation device of the large-section slurry balance type pipe jacking machine include: excavation mode, bypass mode, shutdown mode and backwashing mode; the excavation mode, bypass mode, shutdown mode and backwashing mode can be adjusted and switched.

[0073] Among them, Figure 5 As shown, in the embodiment of the utility model, the excavation mode, stop mode and backwashing mode in the mud circulation device correspond to the excavation mode, stop mode and backwashing mode in the operation process of the pipe jacking machine; in the mud circulation device, the conversion between the three modes except the bypass mode requires the transition in the bypass mode.

[0074] The technical solution of the utility model is described below in combination with a specific working mode:

[0075] When the mud circulation device is in the excavation mode, if the formation is relatively stable, the mud in the mud and water bin has good fluidity, and the mud carries slag smoothly, direct discharge is adopted. At this time, the first valve 5, the second valve 11, the third valve 13, the fourth valve 8, and the fifth valve 9 are opened, and the sixth valve 16, the seventh valve 17, the eighth valve 18-2 and the ninth valve 18-4 are closed. The mud slurry is modulated by the ground mud and water treatment system 1, and then sent to the upper slurry inlet pipe 6 and the middle slurry inlet pipe 7 through the slurry pump 2 and then enters the mud and water bin. After mixing with the excavated slag, it is discharged through the slurry discharge port and sent to the ground by the slurry discharge pump 3.

[0076] Among them, in the excavation mode, when direct discharge is carried out, the outlet of the slurry discharge pipe 12 is arranged at the bottom of the mud and water bin, so that a large range of mud flow can be formed in the vertical direction of the mud and water bin, and the mud fluidity in the mud and water bin is enhanced. On the one hand, the mixing effect of the incoming slurry and the excavated debris is enhanced, so that the mud in the mud and water bin is evenly distributed, and the pressure fluctuation of the heading face is reduced. On the other hand, it avoids only local rapid flow to form local over-discharge, thereby stabilizing the excavated soil layer.

[0077] If the excavation stratum is relatively complex, the excavated debris is stagnant, or there may be risk conditions such as gushing, a screw machine is used for slurry discharge. At this time, the first valve 5, the second valve 11, the fourth valve 8, the fifth valve 9, the sixth valve 16, and the seventh valve 17 of the ball valve are opened, and the third valve 13, the eighth valve 18-2 and the ninth valve 18-4 are closed. The mud slurry is modulated by the ground mud and water treatment system 1, and then sent to the upper slurry inlet pipe 6 and the middle slurry inlet pipe 7 through the slurry pump 2 and then into the mud and water bin, and enters the screw conveyor 14 together with the excavated debris. After the mud is further diluted by the screw machine, it is sent to the ground by the slurry discharge pump 3.

[0078] Among them, in the excavation mode, when the screw machine is used to discharge slurry, the screw of the screw conveyor 14 is directly extended into the mud and water bin, and the accumulated debris in the mud and water bin can be directly brought out without the assistance of mud flow, thereby avoiding the accumulation of debris in the mud and water bin and stagnation of discharge. At the same time, a soil plug effect can be formed inside the screw machine. When gushing occurs, the gushing mud can be discharged while maintaining the pressure in the mud and water bin, thereby avoiding destroying the mud and water pressure balance of the heading face, thereby controlling surface settlement.

[0079] When the mud circulation system is in the bypass mode, the eighth valve 18-2 and the ninth valve 18-4 are opened, and the first valve 5, the second valve 11, the third valve 13, the fourth valve 8, the fifth valve 9, the sixth valve 16 and the seventh valve 17 are closed. The mud slurry is modulated by the ground mud and water treatment system 1, sent to the bypass pipe through the slurry pump 2, and then sent to the ground by the slurry discharge pump 3.

[0080] Among them, in the bypass mode, the circulating mud slurry and the mud and water tank can be isolated to avoid large disturbances to the mud and water tank caused by mode switching. At the same time, part of the pipeline in the pipeline can be flushed to avoid impact on the entire system while unblocking the pipeline.

[0081] When the mud circulation system is in shutdown mode, the first valve 5, the second valve 11, the third valve 13, the fourth valve 8, the fifth valve 9, the sixth valve 16, the seventh valve 17, the eighth valve 18-2 and the ninth valve 18-4 are all closed, and the slurry inlet pump 2 and the slurry discharge pump 3 are shut down.

[0082] Among them, in the shutdown mode, the manual gate valve of the pulp collection and pipe replacement device 19 cuts off the ground and system pipelines for pipe replacement operations, or performs maintenance and repair operations on the equipment according to actual on-site needs.

[0083] When the mud circulation device is in the backwash mode, the third valve 13, the fourth valve 8, the fifth valve 9, the eighth valve 18-2 and the ninth valve 18-4 are opened, and the first valve 5, the second valve 11, the sixth valve 16 and the seventh valve 17 are closed. The mud slurry is modulated by the ground mud and water treatment system 1, and then sent to the slurry discharge pipe 12 through the slurry feed pump 2 and enters the mud and water bin. After being mixed with the excavated debris, it is discharged through the upper slurry feed pipe 6 and the middle slurry feed pipe 7 and sent to the ground by the slurry discharge pump 3.

[0084] Among them, when the system is in the backwash mode, it can run this mode for a short time to flush the blocked part in case of blockage of the slurry discharge pipe 12 or the slurry discharge port, so as to restore the normal operation of the system.

[0085] To explain more specifically, the mud circulation device of the large-section mud-water balance type pipe jacking machine provided by the embodiment of the utility model can solve the problems of uneven mud flow in the mud and water bin of the pipe jacking machine, causing local over-discharge problems, uneven mixing of excavated debris and incoming slurry, causing pressure fluctuations in the mud in the mud and water bin, and gushing of excavated strata, causing pressure fluctuations in the mud and water bin and resulting in mud balance failure. In the mud circulation device of the large-section mud-water balance type pipe jacking machine described in the utility model, the main frame of the system is composed of the ground mud and water treatment system 1, the first valve 5, the first conveying pipe 4, the slurry inlet pipe, the slurry inlet valve group, the second conveying pipe 10, the second valve 11, the slurry discharge pipe 12, the third valve 13, the screw conveyor 14, the screw machine pipeline 15, the screw machine valve group, the bypass pipeline 18, and the slurry collection and pipe replacement device 19; the ground mud and water treatment system 1 is used to prepare mud slurry, and the first conveying pipe 4, the slurry inlet pipe, the second conveying pipe 10, the slurry discharge pipe 12, the bypass pipeline 18, the screw machine pipeline 15 and the slurry collection pipeline are combined into a system pipeline, The slurry inlet pump 2 and the slurry discharge pump 3 are installed on the system pipeline, which can realize the circulation of the modulated mud slurry from the ground mud and water treatment system 1 to the mud and water bin of the pipe jacking machine, and the first valve 5, the second valve 11, the third valve 13, the fourth valve 8, the fifth valve 9, the sixth valve 16, the seventh valve 17, the eighth valve 18-2 and the ninth valve 18-4 are combined into a control valve group in the circulation system, which can control the on and off of different pipelines according to the different operating geology; when the pipe jacking machine is excavating, the mud circulation system is in the excavation mode, and the direct discharge slurry or the spiral machine slurry discharge mode can be selected according to the formation conditions: If the stratum is relatively stable, the fluidity of the mud in the mud and water bin is good, and the mud carries the slag relatively smoothly, direct discharge can be adopted. At this time, the valve is adjusted to allow the mud slurry to pass through the slurry inlet pump 2 and enter the middle and upper chambers of the pipe jacking machine to be fully mixed with the slag soil. Then, the slurry is discharged from the slurry discharge pipe 12 at the bottom of the mud and water bin by the slurry discharge pump 3 and flows back to the ground mud and water treatment system 1. Since the slurry discharge pipe 12 is connected to the bottom of the mud and water bin, a large-scale mud flow can be formed in the vertical direction of the mud and water bin, which can enhance the fluidity of the mud in the mud and water bin, make the mud in the mud and water bin evenly distributed, reduce the pressure fluctuation of the face, and stabilize the excavation soil layer. When the geology of the pipe jacking machine is complex, When the mud is mixed, the mud circulation system can use a screw machine to discharge the slurry. At this time, the mud slurry is allowed to pass through the slurry pump 2 by adjusting the valve on and off, enter the middle and upper chambers of the jacking machine, and be fully mixed with the slag. Then the mud slurry and the excavated slag enter the screw conveyor 14 together, and after the screw conveyor 14 flushes the mud for further dilution, it is sent to the ground by the slurry discharge pump 3. Since the screw of the screw machine directly extends into the mud and water bin, the slag accumulated in the mud and water bin can be directly brought out. At the same time, a soil plug effect can be formed inside the screw machine. When gushing occurs, the gushing mud can be discharged to avoid destroying the mud and water pressure balance of the heading face, thereby effectively controlling surface settlement.It can be seen that, compared with the prior art, the technical solution provided by the utility model enhances the fluidity of mud in the mud and water bin of the large-section rectangular pipe jacking machine by redistributing the slurry inlet and discharge pipes, avoids local over-discharge, controls ground subsidence, and fully mixes the mud with the excavated debris, reduces the pressure fluctuation in the mud and water bin, and improves the stability of the mud and water pressure balance; through the direct discharge and spiral machine dual-channel form, the adaptability of the mud and water pipe jacking machine to complex formations and the risk resistance to gushing are improved, and the working mode of the small-flow slurry pump combination can be used to improve the overall pressure control ability of the system and further reduce the pressure fluctuation in the mud and water bin.

[0086] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mud circulation device for a large-section mud-water balance pipe jacking machine, characterized in that: include: Slurry inlet pump and slurry discharge pump connected to the ground mud and water treatment system; A first delivery pipe disposed at the output end of the slurry feed pump; a first valve disposed on the first delivery pipe; One end is connected to the first conveying pipe, and the other end is connected to the slurry inlet pipe of the upper chamber in the mud and water bin of the pipe jacking machine; A slurry inlet valve group arranged on the slurry inlet pipe; A second delivery pipe disposed at the input end of the slurry discharge pump; a second valve disposed on the second delivery pipe; One end is connected to the second delivery pipe, and the other end is connected to the slurry discharge pipe of the bottom chamber of the mud and water bin of the pipe jacking machine; A third valve disposed on the slurry discharge pipe; A screw conveyor arranged in the pipe jacking machine; A screw machine pipeline connected to the slurry inlet pipe and the slurry discharge pipe; A screw machine valve group is arranged on the screw machine pipeline.

2. The mud circulation device of the large-section mud-water balance pipe jacking machine according to claim 1 is characterized in that: The slurry inlet pipe comprises: Upper slurry inlet pipe; One end of the upper slurry inlet pipe is connected to the first conveying pipe, and the other end is connected to the upper chamber of the mud and water bin of the pipe jacking machine; A middle-layer pulp inlet pipe arranged in parallel with the upper-layer pulp inlet pipe; One end of the middle-layer slurry inlet pipe is connected to the first conveying pipe, and the other end is connected to the middle-layer chamber of the mud and water bin of the pipe jacking machine.

3. The mud circulation device of the large-section mud-water balance pipe jacking machine according to claim 2 is characterized in that: The slurry inlet valve group comprises: A fourth valve disposed on the upper slurry inlet pipe; A fifth valve is arranged on the middle-layer slurry inlet pipe.

4. The mud circulation device of the large-section mud-water balance pipe jacking machine according to claim 1 is characterized in that: The spiral machine pipeline comprises: One end is connected to the slurry inlet pipe, and the other end is connected to the screw conveyor slurry inlet pipe of the screw conveyor; One end is connected to the slurry discharge pipe, and the other end is connected to the screw conveyor slurry discharge pipe.

5. The mud circulation device of the large-section mud-water balance type pipe jacking machine according to claim 4 is characterized in that: The screw machine valve group comprises: A sixth valve disposed on the slurry inlet pipe of the screw machine; A seventh valve is arranged on the slurry discharge pipe of the screw machine.

6. The mud circulation device of the large-section mud-water balance pipe jacking machine according to claim 1 is characterized in that: The large-section mud-water balance type pipe jacking machine mud circulation device also includes: A bypass pipe is disposed between the first delivery pipe and the second delivery pipe and is in communication with the first delivery pipe and the second delivery pipe.

7. The mud circulation device of the large-section mud-water balance pipe jacking machine according to claim 6 is characterized in that: The bypass pipeline comprises: a first bypass pipe having one end connected to the first delivery pipe and the other end connected to the second delivery pipe; an eighth valve disposed on the first bypass pipe; a second bypass pipe having one end connected to the first delivery pipe and the other end connected to the second delivery pipe; a ninth valve disposed on the second bypass pipe; The first bypass pipe and the second bypass pipe are arranged to cross each other.

8. The mud circulation device of the large-section mud-water balance type pipe jacking machine according to claim 7 is characterized in that: A first connection end is provided at a connection point between the first bypass pipe and the first delivery pipe, and a second connection end is provided at a connection point between the second bypass pipe and the first delivery pipe; The first valve is disposed between the first connection end and the second connection end; A third connection end is provided at the connection between the first bypass pipe and the second delivery pipe, and a fourth connection end is provided at the connection between the second bypass pipe and the second delivery pipe; The second valve is disposed between the third connection end and the fourth connection end.

9. The mud circulation device of the large-section mud-water balance pipe jacking machine according to claim 1 is characterized in that: The large-section mud-water balance type pipe jacking machine mud circulation device also includes: One end is connected to the output end of the slurry inlet pump, and the other end is connected to the slurry collecting and changing pipe device at the output end of the slurry discharge pump.

10. The mud circulation device of the large-section mud-water balance type pipe jacking machine according to claim 9 is characterized in that: The slurry collecting and tube changing device comprises: Slurry collection tank; One end is connected to the pulp collection pool, and the other end is connected to the first pulp collection pipe at the output end of the pulp feed pump; One end is connected to the pulp collection pool, and the other end is connected to the second pulp collection pipe at the output end of the pulp discharge pump.

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