Earth pressure balance type pipe-jacking construction screw machine unearthing-to-muddy water deslagging device

Abstract

The utility model discloses an earth pressure balance type pipe-jacking construction screw machine unearthing-to-muddy water deslagging device. Relates to an earth pressure balance type pipe-jacking construction screw machine unearthing and deslagging device. The muck is converted from a solid phase to a liquid phase and then is discharged through a pipeline, so that large-size and complex migration equipment is prevented from being arranged in a tunnel with a limited operation space. One end of a spiral unearthed machine is connected with a soil discharge port of a soil bin of the push bench, and a slurry box is communicated with the spiral unearthed machine through a discharge port; a slurry inlet pipe is arranged on one side of the slurry box, a slurry outlet pipe is arranged on the side, adjacent to the slurry inlet pipe, of the surface of the slurry box, and the slurry inlet pipe, the slurry outlet pipe, the slurry pump and the slurry pool form a slurry inlet and outlet circulation system through pipelines. According to the utility model, the technical measures of separating obstacles and impurities and realizing solid-liquid conversion are innovatively adopted, and a ground slurry circulating system is combined, so that the deslagging quantity can be reasonably regulated and controlled according to the water and soil pressure of a tunnel face to realize pressure-maintaining unearthing, and the safe construction and efficient deslagging are further realized; the application prospect is good and the comprehensive benefit is obvious.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary equipment for underground tunnel engineering construction, in particular to an earth pressure balance type jacking construction screw machine excavation and slag discharge device. Background Art

[0002] Earth pressure balance (EPB) pipe jacking primarily balances the earth pressure and groundwater pressure at the machine's face by controlling the volume of soil discharged from the soil chamber using an auger. The soil removed by the cutterhead is then discharged by the auger. Because the front casing of the machine is separated by a bulkhead into a front earth pressure chamber and a rear power compartment, groundwater cannot penetrate. Therefore, EPB pipe jacking can be used even in conditions with high groundwater levels. Furthermore, its pressure-maintaining excavation method effectively controls ground subsidence, ensuring safer construction. It is suitable for soft soils, clay soils, silty soils, sandy soils, gravel, and soft rock formations.

[0003] There are two main traditional methods of slag removal in earth pressure balance pipe jacking construction: the first is transportation by slag cart, and the second is belt conveyor. Among them, the first method of slag cart transportation is to use a spiral excavator (referred to as "screw machine") to transport the slag in the soil bin to the slag bucket trolley. Then, a winch or electric flatbed truck will transport the slag-filled trolley horizontally from the constructed jacking tunnel to the starting shaft. After that, it will be transported vertically to the ground slag pool by a traveling crane. Finally, the empty slag bucket trolley will be returned to the discharge port of the spiral excavator for the next slag removal cycle. This slag removal method has problems such as low efficiency, cost waste, and limited slag removal conditions.

[0004] In real-world construction scenarios, when constructing large-section, long-distance rectangular pipe jacking, a large volume of excavated soil is generated with each pipe section. For example, if the pipe section is 50 square meters, the excavation volume for each 1.5-meter-long pipe section is approximately 75 cubic meters (not considering the bulkiness of the excavated soil after soil modification). This requires 9 to 10 horizontal and vertical transport cycles of excavated soil (with a capacity of approximately 7-8 cubic meters). This back-and-forth excavation cycle takes a long time, preventing continuous excavation and jacking during each pipe section, seriously impacting jacking speed and construction efficiency. The prolonged excavation process also leads to significant labor downtime and increased construction costs. Furthermore, the excavator must be positioned too high, as this will affect laser theodolite measurements and, in turn, the construction axis. When constructing small-section pipe jacking (with a clear clearance area of less than 10 square meters), the limited working space within the tunnel makes it difficult to arrange excavator carts and transport tracks, severely limiting excavation conditions and hindering construction.

[0005] The second belt conveying method involves installing a belt conveyor at an upward angle below the screw conveyor outlet. The soil from the pushed-in pipe section is conveyed to the belt conveyor via the screw conveyor. The soil is then transported to a dump truck parked on a track within the channel or directly to the starting wellhead via a continuous belt conveyor. The soil is then hoisted out to a surface soil pit by a crane. Although this method allows for continuous excavation and jacking during the construction of a pipe section, resulting in rapid excavation and high construction efficiency, the device requires a large investment in equipment, has a complex structure and installation, occupies a large working space, and the continuous conveying equipment is prone to wear and requires frequent maintenance. When the jacking pipe section is small, the installation space is limited and there is still a problem of easily blocking the laser theodolite measurement.

[0006] The existing patent (CN111577314.A) provides a slag discharge device and method for earth pressure balance pipe jacking construction. This technology includes a slag bucket with a slag inlet connected to the slag outlet of the pipe jacking machine. The slag discharge device also includes a moisture measurement device installed in the slag bucket for detecting the moisture content of the slag in the slag bucket; a water supply device electrically connected to the moisture measurement device, with the water supply device's outlet connected to the slag inlet, and used to control the opening and closing of the water outlet according to the moisture content of the slag in the slag bucket; a stirring device fixed to the slag bucket for mixing the slag in the slag bucket with water to form a mixed slurry; and a delivery pump installed in the slag bucket for pumping the mixed slurry into the slag pit. The slag discharge device and method provided by this technology change the soil properties of the slag, pumping the mixed slurry with plastic soil characteristics directly from underground to the surface slag pit, saving soil transportation time and improving slag discharge efficiency.

[0007] In combination with the existing technology, the aforementioned slag discharge equipment and slag discharge method for earth pressure balance pipe jacking construction have the following defects:

[0008] 1. The required slag bucket has a large volume because it is equipped with a stirring device, a stirring rod, and a stirring drive device, and is also connected to a vibrator, a vibration drive device, a mounting base, an intermediate connecting rod, a vibration rod and other components on the outside. The overall working space is large, and the operating space in the channel is severely limited during the construction of a jacking pipe with a small cross-section. At this time, the applicability of the slag discharge device is not strong.

[0009] 2. In order to prevent the slag from adhering to the inner wall of the hopper, a series of vibration devices are set up. The structure is relatively complex. The vibration impact force generated during operation may have a certain impact on the stability of the moisture measuring device in the hopper, and then affect the accurate judgment of the water supply device, resulting in poor mixing of the slag and water in the hopper, and ultimately affecting the pumping effect and efficiency.

[0010] 3. The device lacks an obstacle clearance port. Depending on the specific project conditions, the geological conditions of the rock and soil mass at the tunnel face excavated by the pipe jacking machine are difficult to predict, and obstacles and debris are inevitable. If the soil discharged from the screw machine contains large-sized pebbles, oyster shells, shells and other obstacles and debris, if no troubleshooting and clearing measures are taken, the slag outlet and the port of the delivery pump will be blocked, resulting in failure of slag discharge, inability to continue the jacking construction, and delays in the construction period.

[0011] Therefore, it is urgent to design a safe, efficient, environmentally friendly, adaptable, and easy-to-clear earth pressure balance type pipe jacking construction screw machine excavation and slag removal device. Utility Model Content

[0012] In response to the problems existing in the background technology, the utility model proposes an earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag discharge device, which converts the slag from solid phase to liquid phase and then discharges it through a pipeline to avoid the installation of large-scale and complex transportation equipment in a tunnel with limited working space.

[0013] The embodiment of the utility model provides an earth pressure balance type jacking construction screw machine excavation and mud and water slag discharge device, comprising a spiral excavator and a mud box, one end of the spiral excavator is connected to the soil discharge port of the jacking machine soil bin, and the mud box is fixed to the bottom of the spiral excavator and is connected to the spiral excavator through a discharge port;

[0014] A slurry inlet pipe is provided on one side of the mud box, and a slurry outlet pipe is provided on the surface of the mud box adjacent to the slurry inlet pipe. The slurry inlet pipe and the slurry outlet pipe form a circulation system with the slurry inlet and discharge system, the mud pump and the mud pool through pipelines.

[0015] Preferably, the other end of the spiral excavator is open or closed, and the other end of the spiral excavator is open for connecting to an external slag discharge device.

[0016] Preferably, part of the slag transported by the screw excavator enters the mud box through the discharge port, and the slag in the mud box is transported out by the circulation system in the form of mud carrying slag.

[0017] Preferably, a second high-pressure water inlet is provided on one side of the mud box, and the second high-pressure water inlet is on the same side as the slurry inlet pipe. A first high-pressure water inlet is provided on the other adjacent side of the slurry inlet pipe on the surface of the mud box, and the first high-pressure water inlet and the second high-pressure water inlet are externally connected to a high-pressure water supply pipeline.

[0018] Preferably, a spare slurry discharge interface is provided on one side of the mud box, and the spare slurry discharge interface is used to connect to the pipeline of the circulation system.

[0019] Preferably, a grid is provided in the mud box, and the grid is arranged at the pipe opening of the slurry outlet pipe to limit obstacles transported through the slurry outlet pipe.

[0020] Preferably, an obstacle clearance port is provided on one side of the mud box, and the obstacle clearance port is used to remove obstacles that cannot pass through the grille.

[0021] Preferably, the mud pool includes a slurry inlet pool and a slurry outlet pool, the mud in the slurry outlet pool is filtered into thinner mud and flows into the slurry inlet pool, one end of the slurry outlet pipe is connected to the slurry outlet pool, and one end of the slurry inlet pipe is connected to the slurry inlet pool.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] The utility model discharges the slag discharged by the spiral excavator into the mud box, and fully stirs and dilutes the slag in the mud box through water or slurry injected from the second high-pressure water inlet and the slurry inlet pipe to a state that is convenient for discharge and pumping through the slurry outlet pipe. The grid is also used to block obstacles with larger particle sizes (such as pebbles, oyster shells, and shells) to prevent them from clogging the slurry outlet pipe. The slurry outlet pipe then transports the slag to the slag pool or mud pool on the ground, and then circulates the filtered mud in the ground slag pool or mud pool into the mud box in the top pipe channel through the slurry inlet pipe, thus forming a mud-water circulation system for rapid slag discharge.

[0024] The technical effects of the device are: (1) safe construction, using a soil pressure balanced spiral excavator to maintain pressure for excavation, effectively controlling ground subsidence, and avoiding the problem of ground subsidence caused by over-discharge of mud and water slag caused by the use of a slurry balanced jacking pipe; (2) high construction efficiency, during the jacking process of a section of pipe, the slag can be continuously and uninterruptedly transported to the slag pool or mud pool on the ground of the starting well, which is more than twice the efficiency of the traditional slag trolley excavation, avoiding idle workers and cost waste; (3) simple structure, easy installation and maintenance, and low cost. It avoids the problem of limited working space inside the small-section jacking pipe, and does not affect the measurement of the jacking construction axis by the laser theodolite. It has a simpler structure and better stability than the belt conveyor device and the existing patented technology device; (4) It has good versatility and can be applied to large-section or small-section jacking pipes, and is more suitable for long-distance jacking projects. In addition, it is not affected by the presence of obstacles with larger particle sizes (such as pebbles, oyster shells, shells, concrete blocks of abandoned pipes, etc.), and has strong applicability; (5) The slag is quickly discharged through the mud box for mud and water circulation, which saves the amount of ground mud treatment, saving costs and being environmentally friendly.

[0025] In summary, this utility model, an earth pressure balance type pipe jacking construction screw excavation to mud and water slag removal device, innovatively employs technical measures to separate obstacles and debris and achieve solid-liquid conversion. Combined with the above-ground mud circulation system, it can rationally control the slag discharge volume according to the soil pressure and groundwater pressure at the tunnel face to achieve pressure-maintained excavation, further ensuring safe construction and efficient slag removal. This utility model has promising application prospects and significant comprehensive benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional view of the earth pressure balance type pipe jacking construction screw machine excavation and mud and water slag discharge device in the first direction in the embodiment of the utility model;

[0027] Figure 2 It is a three-dimensional view of the earth pressure balance type pipe jacking construction screw machine excavation and mud and water slag discharge device from the second direction in the embodiment of the utility model;

[0028] Figure 3 This is a front view of the earth pressure balance type pipe jacking construction screw machine excavation and mud and water slag discharge device in the embodiment of the present utility model;

[0029] Figure 4 It is a side view of the earth pressure balance type pipe jacking construction screw machine excavation and mud and water slag discharge device in the embodiment of the present utility model;

[0030] Figure 5 for Figure 4 Cross-sectional view in the AA direction;

[0031] Figure 6 for Figure 3 Cross-sectional view in CC direction;

[0032] Figure 7 for Figure 3 Cross-sectional view in the middle BB direction;

[0033] Figure 8 This is a schematic diagram of the installation of the earth pressure balance type pipe jacking construction screw machine excavation and mud and water slag discharge device in the embodiment of the present utility model.

[0034] Figure numerals: 100 is a spiral excavator; 110 is a discharge port; 200 is a mud box; 201 is a slurry inlet pipe; 202 is a first high-pressure water inlet; 203 is an obstacle clearance port; 204 is a spare slurry discharge interface; 205 is a slurry discharge pipe; 206 is a second high-pressure water inlet; 207 is a grille; 300 is a pipe jacking machine; 400 is a mud pool, 401 is a slurry discharge pool, and 402 is a slurry inlet pool. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "vertical," "lateral," "inner," "outer," "front," "back," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] like Figures 1 to 4 As shown, the embodiment of the present invention proposes an earth pressure balance type pipe jacking construction screw excavation and mud and water slag discharge device, comprising a screw excavator 100 and a mud box 200, one end of the screw excavator 100 is connected to the soil discharge port of the pipe jacking machine soil bin, and the mud box 200 is fixed to the discharge port at the tail of the screw excavator 100 and is connected to the screw excavator 100 through the discharge port 110;

[0038] like Figure 8 As shown, the auger 100 is typically positioned at an angle within the pipe jacking machine, with its length coordinated with the overall length of the equipment. It should be noted that the other end of the auger 100 can be open or closed, with the other end of the auger 100 being open for connection to an external slag discharge device. The discharge port 110 allows the auger 100 to transfer slag into the slurry box 200 during operation.

[0039] A slurry inlet pipe 201 is provided on one side of the mud box 200, and a slurry outlet pipe 205 is provided on the surface of the mud box 200 adjacent to the slurry inlet pipe 201. The slurry inlet pipe 201 and the slurry outlet pipe 205 form a mud circulation system with a mud pump and a mud pool 400 through pipelines.

[0040] In this embodiment, the mud pit 400 includes a discharge pit 401 and an inlet pit 402. The end of the discharge pipe 205 is located in the discharge pit 401, and the front end of the inlet pipe 201 is connected to the inlet pit 402. The mud in the discharge pit 401 is naturally filtered into a relatively thin mud and flows into the inlet pit 402. This facilitates the inlet pipe 201 to circulate the filtered mud to the mud box 200 in the channel via a mud pump for reuse. The filtration of the mud in the discharge pit 401 and the inlet pit 402 is a conventional operation, and the specific structure and installation method will not be repeated here.

[0041] Specifically, the mud box 200 is welded to the discharge port at the rear of the spiral excavator 100, and a slurry inlet pipe 201 is provided on one side of the mud box 200, so that the mud pump can pump the filtered mud water in the mud pool 400 into the mud box 200 through the pipeline, flush the slag to form mixed mud, and then return it to the mud pool 400 through the slurry outlet pipe 205 and the pipeline, slurry inlet and discharge system, thereby forming a circulation system, which is used to continuously treat the slag and achieve continuous and rapid slag discharge.

[0042] Furthermore, the slag part transported from the soil bin of the pipe jacking machine 300 through the screw excavator 100 enters the mud box 200 through the discharge port 110, and the slag in the mud box 200 is transported out by the circulation system in the form of mud carrying slag.

[0043] It should be noted that the slurry inlet and outlet system is an existing technology, so no further details will be given here.

[0044] In this embodiment, an earth pressure balanced spiral excavator is used to maintain pressure and excavate, effectively controlling ground subsidence and avoiding the problem of ground subsidence caused by over-discharge of mud and water slag during slurry-water balanced jacking. During the jacking process of a section of pipe, the slag can be continuously and uninterruptedly transported to the slag pool or mud pool on the ground of the starting well, which is more than twice as efficient as the excavation of traditional slag carts and avoids the waste of workers' idle work and cost. The problem of limited working space inside the jacking pipe with a small cross-section is avoided, and the laser theodolite will not be affected in measuring the jacking construction axis. The structure is simpler and more stable than the belt conveyor device and the existing patented technology device. It can be applied to large or small cross-section jacking pipes and is more suitable for long-distance jacking projects. In addition, slag discharge is not affected in the presence of large-sized obstacles such as pebbles, oyster shells, shells, concrete blocks from abandoned pipes, etc., and has strong applicability. Mud and water circulation and slag discharge are carried out through the mud box, saving the amount of ground mud treatment, which is both cost-effective and environmentally friendly. In summary, the slag discharge device has a large demand, good application prospects and significant comprehensive benefits.

[0045] A second high-pressure water inlet 206 is provided on one side of the mud box 200, and the second high-pressure water inlet 206 is on the same side as the slurry inlet pipe 201. A first high-pressure water inlet 202 is provided on the surface of the mud box 200 on the other adjacent side of the slurry inlet pipe 201. The first high-pressure water inlet 202 and the second high-pressure water inlet 206 are externally connected to a high-pressure water supply pipeline.

[0046] Water is supplied to the second high-pressure water inlet 206 and the first high-pressure water inlet 202 through the high-pressure water supply pipeline, so that the second high-pressure water inlet 206 and the first high-pressure water inlet 202 eject high-pressure water flow into the mud box 200. On the one hand, the slag in the mud box 200 can be diluted sufficiently, and on the other hand, the inner wall of the mud box 200 can be flushed to remove adhesions on the inner wall.

[0047] It should be noted that a spare slurry discharge port 204 is provided on one side of the slurry box 200. The spare slurry discharge port 204 is used to connect to the pipeline of the circulation system. By providing the spare slurry discharge port 204, when the cross-section of the jacking pipe is large and the amount of slag discharged from the screw excavator 100 is large after continuously jacking one section of pipe, and the slag discharge using a single slurry discharge pipe 205 does not meet the jacking efficiency requirements, the spare slurry discharge port 204 at the bottom of the slurry box 200 can be opened to discharge slag simultaneously, further improving the slag discharge efficiency.

[0048] like Figures 5 to 7 As shown, a grid 207 is provided within the mud box 200. The grid 207 is positioned at the mouth of the slurry discharge pipe 205 to limit obstacles transported through the slurry discharge pipe 205. The grid 207 within the mud box 200 prevents large-particle obstacles, such as pebbles, shells, and oyster shells, from entering the slurry discharge pipe, thereby preventing them from affecting slag discharge. Alternatively, the first high-pressure water inlet 202 is positioned toward the grid 207 to flush the grid 207 and prevent obstacles from clogging the grid 207.

[0049] Furthermore, a clearance port 203 is provided on one side of the mud box 200 for removing obstacles that cannot pass through the grille 207. The clearance port 203 needs to be manually cleaned regularly to remove obstacles such as large-sized pebbles, shells, oyster shells, and concrete blocks from abandoned pipes that are brought out by the screw conveyor and hinder the removal of mud and debris. It should be noted that the clearance port 203 is usually sealed.

[0050] It should be noted that the connection positions of the slurry inlet pipe 201, the slurry outlet pipe 205 and the mud box 200, as well as the setting position of the grille 207 can be flexibly adjusted. The one provided in this case is the optimal setting method. The technical personnel in this field can use this as inspiration, and other setting positions obtained are all within the scope of protection of this utility model.

[0051] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "disposed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0052] The above specific embodiments are only one or several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag discharge device, characterized in that: It includes a spiral excavator and a mud box, one end of the spiral excavator is connected to the soil discharge port of the pipe jacking machine, and the mud box is fixed to the discharge port at the tail of the spiral excavator and is connected to the spiral excavator through the discharge port; A slurry inlet pipe is provided on one side of the mud box, and a slurry outlet pipe is provided on the surface of the mud box adjacent to the slurry inlet pipe. The slurry inlet pipe and the slurry outlet pipe form a circulation system with the slurry inlet and discharge system, the mud pump and the mud pool through pipelines.

2. The earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag removal device according to claim 1 is characterized in that: The other end of the spiral excavator is open or closed, and the other end of the spiral excavator is open for connecting to an external slag discharge device.

3. The earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag removal device according to claim 1 is characterized in that: The slag transported by the screw excavator enters the mud box through the discharge port, and the slag in the mud box is transported out by the circulation system in the form of mud carrying slag.

4. The earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag removal device according to claim 1, characterized in that: A second high-pressure water inlet is provided on one side of the mud box, and the second high-pressure water inlet is on the same side as the slurry inlet pipe. A first high-pressure water inlet is provided on the surface of the mud box on the other adjacent side of the slurry inlet pipe. The first high-pressure water inlet and the second high-pressure water inlet are externally connected to a high-pressure water supply pipeline.

5. The earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag removal device according to claim 1, characterized in that: A spare slurry discharge interface is provided on one side of the mud box, and the spare slurry discharge interface is used to connect to the pipeline of the circulation system.

6. The earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag removal device according to claim 1, characterized in that: A grid is provided in the mud box and is arranged at the pipe opening of the mud outlet pipe to limit obstacles transported through the mud outlet pipe.

7. The earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag removal device according to claim 6, characterized in that: An obstacle clearance opening is provided on one side of the mud box, and the obstacle clearance opening is used to remove obstacles that cannot pass through the grille.

8. The earth pressure balance type pipe jacking construction screw machine excavation to mud and water slag removal device according to claim 1, characterized in that: The mud pool includes a slurry inlet pool and a slurry outlet pool. The mud in the slurry outlet pool is filtered into a thinner mud and flows into the slurry inlet pool. One end of the slurry outlet pipe is connected to the slurry outlet pool, and one end of the slurry inlet pipe is connected to the slurry inlet pool.

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