Construction Method of Water Jet Cutting Diameter-Limiting Plate under High Pressure in Composite Strata of Slurry Shield

Abstract

The present invention discloses a construction method for cutting a diameter-limiting plate with a water jet under high pressure in a composite stratum of a slurry shield, which is carried out according to the following construction steps: (1) Installation of the water jet equipment; (2) Debugging of the water jet equipment; (3) Installation of the camera; (4) Protection before cutting; (5) Cutting; (6) Reverse transportation of the diameter-limiting plate; (7) Dismantling and relocation of the equipment. The present invention uses a camera to remotely operate the water jet cutting, realizing the rapid removal of the diameter-limiting plate under high pressure conditions, and solving many deficiencies of the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, and more specifically to a construction method for cutting a diameter limiting plate with a water jet under high pressure in a slurry shield composite stratum. Background Art

[0002] In the construction of cross-river tunnels, shield construction has become the preferred method for cross-river tunnel construction due to its strong adaptability, fast and safe construction, and small impact on the surrounding environment. Especially for poor geological conditions, high water and soil pressure, complex and changeable strata, shield construction has more obvious technical and economic advantages. However, due to the influence of stratum conditions, especially the influence of composite strata such as uneven soft and hard, interlayered soft and hard, soft in front and hard in back, hard in front and soft in back, the cutterhead of the shield machine cannot take into account the characteristics of each stratum well during the selection process, and cannot adapt to all strata 100%. In the selection of the cutterhead opening rate, the purpose is often to adapt to the excavation of hard rock strata, and the cutterhead opening rate is controlled by adding limit plates and other measures. During the excavation process, once the soft soil stratum and geological survey change, such as increased clay content, soft rock mud, etc., due to the small opening rate, the cut soil is easy to adhere to the cutterhead, resulting in poor flow of slag, further blocking the cutterhead opening, and finally causing the cutterhead to form mud cakes. If it is not resolved in time, at best the normal excavation speed cannot be guaranteed, and at worst the shield machine cannot operate normally.

[0003] The mud cake is currently mainly cleaned by dispersant bubble chamber cleaning and pressure chamber cleaning. These two methods can solve the mud cake, but cannot fundamentally solve the problem of too small cutter disc opening rate. Since the cutter disc has been formed, major changes cannot be made. Therefore, how to increase the cutter disc opening rate by quickly cutting off the limit plate in a high-pressure confined space is a very important and necessary task.

[0004] The traditional methods for cutting diameter limit plates mainly include oxygen-acetylene cutting, gouging and cutting machine cutting. Oxygen-acetylene cutting and gouging involve hot work in the cabin, which is high risk, and the cutting efficiency of the cutting machine is low. The above methods all have great limitations and dangers.

[0005] Existing cutting technologies have high risk factors, low efficiency, high costs, and poor environmental performance. At present, there are two main problems in cutting the limit plate in the cabin. One is how to avoid risks in the adopted method, and the other is how to reduce the amount of work in the cabin and reduce costs. Therefore, how to take these two issues into account and complete the cutting of the limit plate of the shield cutter head safely and efficiently has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of this, the present invention proposes a construction method for water jet cutting a diameter-limiting plate under high pressure in a muddy water shield composite formation, which belongs to a water jet cutting technology under high pressure conditions. By using a camera for remote operation cutting, it realizes the rapid removal of the diameter-limiting plate under high pressure conditions, and solves many deficiencies of the prior art.

[0007] The specific technical solution of the present invention is as follows:

[0008] A construction method for water jet cutting a diameter-limiting plate under high pressure in a muddy water shield composite formation is carried out according to the following construction steps:

[0009] (1) Installation of water jet equipment;

[0010] Install the water jet equipment on the shield machine, connect the through-bulkhead parts, and prepare the in-bulkhead connection components;

[0011] (2) Debugging of water jet equipment;

[0012] (3) Installation of camera;

[0013] Rotate the cutter head on the shield machine to the specified position, with the diameter-limiting plate to be cut removed facing vertically upwards. Personnel enter the bulkhead to connect the pipelines, fix the water jet track, adjust the distance of the water jet nozzle, and install the camera;

[0014] (4) Protection before cutting;

[0015] Conduct protection before cutting, and turn on the water jet equipment for trial cutting to check whether remote operation is satisfied. After meeting the requirements, personnel withdraw;

[0016] (5) Cutting;

[0017] (6) Inverted transportation of the diameter-limiting plate;

[0018] (7) Removal and displacement of equipment.

[0019] Preferably, in the construction method for water jet cutting a diameter-limiting plate under high pressure in a muddy water shield composite formation of the present invention, before the step (1), it is necessary to first let the personnel of the water jet equipment manufacturer install and debug the equipment on the ground, select steel plates of the same material specifications for cutting, summarize construction experience, and train relevant staff; at the same time, under the shutdown state of the shield machine, replace the slurry, make a mud film with high-concentration bentonite, and conduct a pressure-holding test after the mud film is made and the bulkhead is leveled.

[0020] Preferably, in the construction method for water jet cutting a diameter-limiting plate under high pressure in a muddy water shield composite formation of the present invention, in the step (1), the installation of the water jet equipment sequentially includes the following three steps: fixing the water jet track, installing and adjusting the water jet nozzle, and connecting the water jet pipelines;

[0021] After completing the steps of fixing the water jet track, installing and adjusting the water jet nozzle, the steps of connecting the water jet pipeline are as follows: Connect the high-pressure water pipe connected in the bin to the quick connector of the traveling trolley. When connecting, it should be noted that the water pipe should not interfere with the movement of the trolley, and check whether there are foreign objects blocking the movement of the trolley. After the inspection is completed, conduct an overall trial run of the traveling trolley. If there is no impact during the movement, cutting can be carried out normally.

[0022] Preferably, in a construction method for water jet cutting of a diameter-limiting plate under high pressure in a muddy water shield composite formation of the present invention,

[0023] (1) The steps of fixing the water jet track include:

[0024] ① Before placing the water jet track, first observe whether the space at the placement location is appropriate; after determining the placement location of the water jet track, check whether the fixing magnets on the track can effectively adsorb on the cutter head. If not, the magnets on the track need to be moved to a suitable position or additional magnets need to be added, and local padding magnets are used to better fix the track;

[0025] ② When placing the water jet track, ensure that it is parallel to the diameter-limiting plate to be cut;

[0026] ③ After placing the water jet track, turn on the switch of the traveling trolley and move it back and forth to observe whether there is a conflict between the traveling trolley and the diameter-limiting plate to be cut. If there is a conflict, use a rubber hammer to tap the track for adjustment.

[0027] (2) The steps of installing and adjusting the water jet nozzle include:

[0028] ① After the water jet track is fixed, install the water jet nozzle; before installing the water jet nozzle, first dredge the nozzle and check whether the nozzle seal ring is intact;

[0029] ② After the nozzle inspection is completed, install the water jet nozzle on the traveling trolley, and adjust the height and angle of the water jet nozzle through the universal joint at the connection;

[0030] ③ The angle of the nozzle should be perpendicular to the plate surface of the diameter-limiting plate. At the same time, observe that the cutting height of the nozzle is preferably at the bottom of the diameter-limiting plate, but it should be noted that the cutting line of the nozzle must be higher than the cutter seat of the cutting tool;

[0031] ④ The distance between the nozzle and the diameter-limiting plate is controlled within 5 mm.

[0032] Preferably, in a construction method for water jet cutting of a diameter-limiting plate under high pressure in a muddy water shield composite formation of the present invention, the debugging of the water jet equipment in step (2) specifically includes the following steps:

[0033] (1) During the installation of the water jet equipment, simultaneously check and add sand to the water jet booster pump and sand tank in the water jet equipment;

[0034] (2) The water jet equipment inside the bin is installed, and the water jet booster pump and sand tank outside the bin are ready for cutting;

[0035] (3) Open the high-pressure pipe ball valve on the bin wall in advance;

[0036] (4) Turn on the water jet booster pump and adjust it to the appropriate pressure. Observe whether there is a water column spraying out from the water jet nozzle. If not, check whether the water jet nozzle is blocked and whether the high-pressure pipe ball valve on the bin wall is open;

[0037] (5) After the water jet nozzle discharges water normally, connect the water jet controller outside the bin and conduct a trial run of the water jet again;

[0038] (6) Check whether the forward and backward movement of the traveling trolley is normal and whether there are any other conflicts; if there is no abnormality in the movement, the traveling trolley returns to the cutting starting point and the water jet booster pump is turned off.

[0039] Preferably, in the construction method of water jet cutting the diameter-limiting plate under high pressure in a muddy water shield composite stratum of the present invention, the installation of the camera in step (3) specifically includes the following steps:

[0040] (1) Fix the camera above the diameter-limiting plate to be cut. The water jet operator checks through the monitor whether the angle of the camera can see the direction of the water jet and the cutting state of the diameter-limiting plate; if the angle is okay, fix the camera and take protective measures for the camera;

[0041] (2) After the camera is installed, fix an industrial water pipe that can be directly opposite the camera for flushing at any time; after the personnel entering the bin fix the industrial water pipe, conduct camera flushing and observe the flushing effect and whether the angle is appropriate in the monitoring animation. If it is not appropriate, adjust it in time.

[0042] Preferably, in the construction method of water jet cutting the diameter-limiting plate under high pressure in a muddy water shield composite stratum of the present invention, the pre-cutting protection in step (4) specifically includes the following steps:

[0043] (1) Diameter-limiting plate protection: Place a wear-resistant plate on the back of the diameter-limiting plate to be cut; adsorb a strong magnet on the diameter-limiting plate and tie the magnet to a firm place with a safety rope. At the same time, wind a sling and a rope around the diameter-limiting plate;

[0044] (2) Peripheral cutter box protection: Lay wear-resistant plates in advance at the cutter box of the diameter-limiting plate to be cut.

[0045] Preferably, in the construction method of water jet cutting the diameter-limiting plate under high pressure in a muddy water shield composite stratum of the present invention, the cutting in step (5) specifically includes the following steps:

[0046] (1) Turn on the water: Open the industrial water valve, open the high-pressure pipe ball valve on the bin wall, and turn on the water jet booster pump;

[0047] (2) Abrasive intervention: After the pressure of the high-pressure water gun reaches the appropriate pressure, open the sand tank to add sand.

[0048] (3) Cutting: After seeing the water column spout and waiting for a few seconds for the sand and water to mix, start operating the traveling trolley to move forward and start cutting.

[0049] (4) Process feeding: When it is found that the water jet cannot effectively penetrate the diameter-limiting plate and water backs up, stop to supplement abrasives. Before adding sand, first turn off the sand tank, wait for a few seconds, then turn off the water jet booster pump. After turning off the water jet booster pump, close the ball valve of the high-pressure pipe on the bin wall at the same time. At this time, first open the pressure relief valve of the sand tank. After the pressure is released, start adding abrasives.

[0050] (5) Replace the cutting nozzle: If it is found that there is no water column spouting from the water jet cutting nozzle and the pipeline is unobstructed, it means that the water jet cutting nozzle is blocked or abnormally damaged, and it needs to be replaced.

[0051] Preferably, in the construction method of water jet cutting the diameter-limiting plate under high pressure in a muddy water shield composite stratum of the present invention, the reverse transportation of the diameter-limiting plate in step (6) specifically includes the following steps: Bind the diameter-limiting plate firmly with a sling, and use a powerful magnet to adsorb it for double insurance. After binding, use a chain block to reverse transport it into the bin.

[0052] Preferably, in the construction method of water jet cutting the diameter-limiting plate under high pressure in a muddy water shield composite stratum of the present invention, the equipment removal and relocation in step (7) specifically includes the following steps:

[0053] (1) After the diameter-limiting plate is cut, first turn off the sand tank, wait for a few seconds, then turn off the high-pressure water gun pump, cut off the power supply, close the ball valve of the high-pressure pipe on the bin wall, and enter the bin to start equipment removal.

[0054] (2) After entering the bin, first remove the high-pressure pipe of the water jet, and then reverse transport the wear-resistant plate to the next cutting position.

[0055] (3) Remove the water jet track and place it at the next cutting position.

[0056] The traditional cutting methods mainly include oxygen-acetylene cutting, gas gouging, and cutting machine cutting. Among them, oxygen-acetylene cutting and gas gouging involve hot work in the cabin, with high risks, and the cutting machine has low cutting efficiency. The above methods all have great limitations and dangers.

[0057] By adopting the above technical solutions, the present invention has the following beneficial effects:

[0058] According to the water jet cutting mechanism, in a limited space and high-pressure environment, this invention can avoid cutting operations with open flames, greatly reducing the risk of working in a pressurized chamber. By using the method proposed in this invention, remote operation outside the chamber can be achieved. The personnel entering the chamber only need to fix the water jet, and do not need to participate in the cutting process throughout, which can reduce the number of times of entering the chamber, greatly reducing the cutting cost. Moreover, the required preparatory work is less, the cutting speed is fast, and the work efficiency is greatly improved. At the same time, the method proposed in this invention can not produce thick smoke during the cutting process, does not consume oxygen, does not require ventilation and oxygen addition, does not endanger the health of the personnel entering the chamber, the cutting water column is parallel to the face, does not damage the mud film, and has minimal impact on the face, greatly improving the safety factor of cutting under high-pressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings described below are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0060] Figure 1 It is a flow chart of the construction method for cutting the diameter-limiting plate with a water jet under high pressure in a composite stratum of a slurry shield in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as a limitation of the present invention.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as a limitation of the present invention.

[0063] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0064] Embodiment:

[0065] An embodiment of the present invention provides a construction method for cutting a diameter-limiting plate with a water jet under high pressure in a muddy shield composite stratum. Referring to the appendix Figure 1 , the overall construction sequence is as follows: First step, the personnel of the water jet equipment manufacturer first install and debug the equipment on the ground, select steel plates of the same material specification for cutting, summarize construction experience, and train the personnel entering the high-pressure chamber on the installation of the water jet track, adjustment of the cutting nozzle distance, etc., and train the personnel outside the chamber on how to control the water jet cutting. Second step, install and debug the water jet equipment on the shield machine, connect the components passing through the chamber, prepare the connecting components inside the chamber, and conduct training and disclosure to the installation personnel entering the chamber. Third step, stop the shield machine, replace the slurry, make a mud film with high-concentration bentonite, and conduct a pressure-holding test in the chamber after the mud film is made (the third step can be carried out simultaneously with the first step). Fourth step, rotate the cutter head on the shield machine to a specified position (with the diameter-limiting plate to be cut facing vertically upward), the personnel enter the chamber to connect the pipelines, fix the water jet track, adjust the distance of the water jet cutting nozzle, and install the camera. Fifth step, carry out pre-cutting protection, and start the water jet equipment for trial cutting, check whether remote operation is satisfied, and after meeting the requirements, the personnel withdraw and start cutting. Sixth step, after the cutting is completed, the personnel enter the chamber to take out the cut diameter-limiting plate outside the chamber, and carry out the cutting work of the next piece. Seventh step, remove and relocate the equipment.

[0066] In the water jet equipment of the present invention, the corresponding water cutting machine system mainly consists of a driving system, a water storage system, a pressurizing system, an abrasive supply system, a control system, and a water circulation system. The working principle of the water jet equipment is as follows: The working medium flows into the high-pressure piston pump through a low-pressure hose after being filtered by the water storage tank. The high-pressure piston pump is powered by an explosion-proof three-phase asynchronous motor to pressurize the working medium. The high-pressure water flows into the abrasive tank through a high-pressure hose, is fully mixed with the abrasive, and drives the abrasive to accelerate. Finally, it forms a high-pressure abrasive jet through the cutting gun nozzle for cutting operations.

[0067] Moreover, when cutting the diameter-limiting plate of the cutter head under high water pressure in the present invention, it is mainly to cut the non-loaded diameter-limiting plates on the main arm and the cutter beam.

[0068] Next, the present invention will take the construction project of the Wuhu South City Cross-River Tunnel of China Railway 14th Bureau as an example to specifically introduce the specific steps of this construction method.

[0069] The Wuhu South City Cross-River Tunnel is located at the "big bend" of the Yangtze River in the Wanjiang section of Wuhu City, Anhui Province. It starts from Weiyi Road in Jiangbei New City in the west and ends at Dagongshan Road in Jiangnan Main City in the east. Two Φ15.07m slurry balance shield machines (manufactured by CRCC for the right line and Herrenknecht for the left line) are used for simultaneous tunneling, starting from Jiangbei and receiving in Jiangnan. When crossing the soft-upper-and-hard-lower composite stratum of argillaceous siltstone, this method is implemented in the actual construction project. The specific implementation plan is as follows:

[0070] Step 1: Preparation

[0071] (1) Personnel Preparation

[0072] The removal of the diameter-limiting plate is carried out under high-pressure conditions, which cannot be operated by ordinary people. Divers with qualifications and construction experience need to be selected for the operation. According to the set pressure, calculate the working time and decompression time, and then determine the required number of people to ensure continuous operation on-site. The technical personnel of the water jet equipment manufacturer need to be on standby at the scene to handle any problems that may occur to the equipment during the cutting process at any time.

[0073] (2) Equipment and Material Preparation

[0074] The preparation of equipment and materials is mainly divided into two parts. One part is the equipment and materials required for in-warehouse operations, and the other part is the equipment and materials required for out-of-warehouse assistance. The in-warehouse equipment and materials mainly include: pneumatic wrench, adjustable wrench, screwdriver, pliers, hammer, headlamp, wall-mounted lamp, high-pressure camera, high-pressure water gun, water jet cart, industrial water pipe, strong magnet, sling, safety belt, tape, PTFE tape, cable tie, etc.; the out-of-warehouse equipment and materials mainly include: high-pressure water gun main unit, water jet main unit, industrial water, industrial gas, medical oxygen, ice cubes, and materials required in the warehouse, etc. The tools, equipment, and materials entering the warehouse must be demonstrated to the divers outside the warehouse and the divers must conduct actual operations to ensure normal use after entering the warehouse. There should be sufficient reserves of all equipment and materials used during the operation.

[0075] (3) Preparation before Opening the Warehouse

[0076] ① Select a suitable shutdown position, arrange monitoring points on the ground, determine the pressure for entering the warehouse according to the buried depth and geological conditions, and conduct a plan review in accordance with the operation process of entering the warehouse under pressure;

[0077] ② After the plan review is passed, start replacing the slurry in the excavation chamber and construct the mud film;

[0078] ③ After the mud film is completed, start leveling the warehouse, conduct a pressure-holding test, and simultaneously prepare the personnel, machinery, and materials required for entering the warehouse;

[0079] ④ After the pressure-holding test is completed, conduct an acceptance of the conditions for entering the warehouse under pressure, and only then can the warehouse be opened for operation.

[0080] (4) Personnel Training

[0081] Personnel training is mainly divided into two aspects. One is to conduct training on entering the warehouse operations for the personnel entering the warehouse, informing them of the operation environment, main work content, precautions, standard requirements, rules and regulations, etc.; the other is to conduct training on water jet operation for the personnel entering the warehouse, training on how to connect the water jet pipeline, how to fix the track, how to adjust the gun head, how to install the camera, how to arrange the flushing water, how to protect the knife box, how to bind and transport the diameter-limiting plate, etc.

[0082] Step 2: Out-of-warehouse simulation drill

[0083] After personnel training and before entering the warehouse for operation, the personnel of the water jet equipment manufacturer install and debug the equipment on the ground, select steel plates of the same material specification for cutting, and summarize the construction experience. And train the high-pressure personnel entering the warehouse on the installation of the water jet track, pipeline installation, adjustment of the distance between the water jet nozzles, replacement of the water jet nozzles, etc., requiring the personnel entering the warehouse to be able to proficiently install and debug the water jet, adjust and replace the gun head, etc.

[0084] Step 3: Installation of water jet equipment

[0085] 1. Fixing of water jet track:

[0086] (1). Before placing the water jet track, observe whether the space at the placement location is appropriate to avoid difficulties in placement due to too small space and obstruction when the trolley moves. After determining the placement location of the water jet track, check whether the fixing magnets on the track can effectively adsorb on the cutter head. If not, move the magnets on the track to a suitable position or add magnets and locally pad magnets to better fix the track to avoid track displacement caused by the reverse impact of the water column during cutting.

[0087] (2). When placing the water jet track, ensure that it is parallel to the diameter-limiting plate to be cut to avoid the water jet walking trolley moving away from or approaching the diameter-limiting plate, resulting in slow cutting efficiency.

[0088] (3). After placing the water jet track, turn on the switch of the walking trolley and move it forward and backward to observe whether there is any conflict between the walking trolley and the diameter-limiting plate to be cut. If there is a conflict, use a rubber hammer to tap the track for adjustment. Remember not to use a hammer to avoid damaging the track and affecting the trolley movement.

[0089] 2. Installation and adjustment of water jet nozzles:

[0090] (1). After the water jet track is fixed, install the water jet nozzles. Before installing the nozzles, use a punch to dredge them to prevent nozzle blockage, and check whether the nozzle seals are intact. If damaged, replace them in time.

[0091] (2). After the nozzle inspection is completed, install the nozzles on the walking trolley, and the height and angle of the water jet nozzles can be adjusted through the universal joint.

[0092] (3). The angle of the nozzles should be perpendicular to the surface of the diameter-limiting plate. At the same time, observe that the cutting height of the nozzles is preferably at the bottom of the diameter-limiting plate, but note that the cutting line of the nozzles must be higher than the cutter seat to prevent damage to the cutter seat.

[0093] (4). The distance between the nozzles and the diameter-limiting plate is controlled within 5 mm to avoid too large a gap and failing to achieve the ideal cutting effect.

[0094] 3. Connection of water jet pipelines:

[0095] Connect the high-pressure water pipe connected well inside the bin to the quick connector of the walking trolley. When connecting, it should be noted that the water pipe should not interfere with the movement of the trolley, and check whether there are foreign objects blocking the movement of the trolley. After the inspection is completed, conduct an overall trial operation of the walking trolley. If the movement is not affected, cutting can be carried out normally.

[0096] Step 4: Equipment commissioning

[0097] (1). During the installation of the water jet equipment, check and add sand to the water jet booster pump and sand tank in the water jet equipment synchronously.

[0098] (2). After the installation of the water jet equipment inside the bin is completed, and the water jet booster pump and sand tank outside the bin are ready, prepare for cutting.

[0099] (3). Open the ball valve of the high-pressure pipe on the bin wall in advance.

[0100] (4). Turn on the water jet booster pump, adjust the pressure to 500 bar, and observe whether there is a water column spraying out from the water jet nozzle. If not, check whether the water jet nozzle is blocked and whether the ball valve of the high-pressure pipe on the bin wall is opened.

[0101] (5). After the water jet nozzle discharges water normally, connect the water jet controller outside the bin and conduct a trial operation of the water jet again (to prevent track displacement).

[0102] (6). Check whether the forward and backward movement of the walking trolley is normal and whether there are any other conflicts. If there is no abnormality in the movement, the walking trolley returns to the cutting starting point and the water jet booster pump is turned off.

[0103] Step 5: Camera installation

[0104] (1). Fix the camera above the diameter-limiting plate to be cut. The water jet operator checks through the monitor whether the angle of the camera can see the direction of the water jet and the cutting state of the diameter-limiting plate. If the angle is okay, fix the camera well and take protective measures for the camera to avoid dropping and breaking.

[0105] (2). After the camera is installed, fix an industrial water pipe (memory pipe), which can be directly facing the camera for flushing at any time, effectively flushing away the mist and mud generated during cutting, and ensuring that the cutting picture is clear. After the personnel entering the bin fix the memory pipe with magnetic blocks, conduct camera flushing and observe the flushing effect and whether the angle is appropriate in the monitoring animation. If it is not appropriate, adjust it in time.

[0106] Step 6: Protection before cutting

[0107] (1). Protection of the diameter-limiting plate:

[0108] When the high-pressure water column completely penetrates the diameter-limiting plate being cut, it may cause damage to other opposite diameter-limiting plates. To address this situation, a wear-resistant plate is usually placed 30 - 40 cm behind the diameter-limiting plate being cut to prevent accidental damage to the cutter head.

[0109] Adsorb a powerful magnet on the diameter-limiting plate and tie the magnet to a secure place with a safety rope to prevent the diameter-limiting plate from falling after being completely cut through; to prevent the magnetism of the magnet from disappearing or the magnetic force being insufficient to bear the weight of the diameter-limiting plate, another sling and rope are wound around the diameter-limiting plate as an insurance measure.

[0110] (2) Peripheral cutter box protection:

[0111] When the water jet cuts the diameter-limiting plate, if the water column does not completely penetrate, refraction of the water flow will occur. A wear-resistant plate is laid in advance at the cutter box of the diameter-limiting plate being cut to protect the cutter box.

[0112] Step 7: Cutting

[0113] (1) Turn on the water: Open the industrial water valve, open the ball valve of the high-pressure pipe on the bin wall, and turn on the water jet booster pump;

[0114] (2) Abrasive intervention: Open the sand tank to add sand after the pressure of the high-pressure water gun reaches 500 bar.

[0115] (3) Cutting: After seeing the water column spray out and waiting for a few seconds for the sand and water to mix, start operating the traveling trolley to move forward and start cutting.

[0116] (4) Process feeding: When it is found that the water jet cannot effectively penetrate the diameter-limiting plate and water backs up, it indicates that the sand material is insufficient. It is necessary to stop and replenish the abrasive. Before adding sand, first turn off the sand tank, wait for 10 seconds and then turn off the water jet booster pump. After turning off the water jet booster pump, close the ball valve of the high-pressure pipe on the bin wall at the same time. At this time, first open the pressure relief valve of the sand tank, and start adding abrasive after the pressure is relieved.

[0117] (5) Replace the cutting nozzle: If it is found that there is no water column spraying out from the water jet cutting nozzle and the pipeline is unobstructed, it means that the water jet cutting nozzle is blocked or abnormally damaged and needs to be replaced.

[0118] Step 8: Invert and transport the diameter-limiting plate

[0119] Bind the diameter-limiting plate firmly with a sling and adsorb it with a powerful magnet as a double insurance to avoid falling during the inversion and transportation process. After binding, use a chain block to invert and transport it into the bin.

[0120] Step 9: Equipment disassembly and relocation

[0121] (1) After the diameter-limiting plate is cut, first turn off the sand tank, wait for 10 seconds, turn off the high-pressure water gun pump, cut off the power supply, close the ball valve of the high-pressure pipe on the bin wall, and enter the bin to start equipment disassembly.

[0122] (2) After entering the warehouse, first remove the high-pressure water jet pipe, and then transfer the wear-resistant plate to the next cutting position.

[0123] (3) Remove the water jet track and place it at the next cutting position. When removing the water jet track, do not drag it forcefully, otherwise it is easy to cause the track to deform.

[0124] In the process of implementing the method of the present invention, it is necessary to reasonably organize the labor force, ensure the quality of equipment and materials, strictly follow the plan process and key points, adhere to the implementation of safety measures and systems, and comply with relevant environmental protection laws and regulations.

[0125] In this specification, the various embodiments are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and reference can be made to the description of the method part for the relevant parts.

[0126] 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 obvious to those skilled in the art, and the general principles defined herein can 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 these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method for a water jet cutting diameter-limiting plate under high pressure in a composite stratum of a slurry shield tunneling machine, characterized in that, Proceed according to the following construction steps: (1) Installation of the water jet equipment; Install the water jet equipment on the shield machine, connect the through-cabin parts, and prepare the in-cabin connection components; The installation of the water jet equipment successively includes the following three steps: fixing the water jet track, installing and adjusting the water jet nozzle, and connecting the water jet pipeline; The water jet pipeline connection step after completing the steps of fixing the water jet track and installing and adjusting the water jet nozzle includes: connecting the high-pressure water pipe connected in the cabin to the quick connector of the walking trolley. When connecting, it should be noted that the water pipe cannot interfere with the walking of the trolley, and check whether there are foreign objects blocking the walking of the trolley. After the inspection is completed, conduct an overall trial operation of the walking trolley. If the walking is not affected, normal cutting can be carried out; (2) Debugging of the water jet equipment; (3) Installation of the camera; Rotate the cutter head on the shield machine to the specified position, with the diameter-limiting plate to be cut vertically upward. Personnel enter the cabin to connect the pipeline, fix the water jet track, adjust the distance of the water jet nozzle, and install the camera; (4) Protection before cutting; Conduct protection before cutting, and turn on the water jet equipment for trial cutting to check whether remote operation is satisfied. After meeting the requirements, personnel withdraw; (5) Cutting; (6) Transfer of the diameter-limiting plate; (7) Dismantling and relocating of the equipment.

2. The construction method of the water jet cutting diameter-limiting plate under high pressure in the composite stratum of slurry shield according to claim 1, characterized in that, Before the step (1), it is necessary to first let the personnel of the water jet equipment manufacturer complete the installation and debugging of the equipment on the ground, select steel plates of the same material specification for cutting, summarize the construction experience, and train the relevant staff; at the same time, under the condition of the shield machine being shut down, replace the slurry, make a mud film with high-concentration bentonite, and conduct a pressure-holding test in the flat cabin after the mud film is made.

3. A construction method for water jet cutting of a diameter-limiting plate under high pressure in a muddy water shield composite formation according to claim 1, characterized in that (1) The water jet track fixing step includes: ①. Observe whether the space size at the placement location is appropriate before placing the water jet track; after determining the placement location of the water jet track, check whether the fixing magnet on the water jet track can effectively adsorb on the cutter head. If not, move the magnet on the water jet track to a suitable position or add magnets or locally pad magnets to better fix the water jet track; ②. Ensure that the water jet track is parallel to the diameter-limiting plate to be cut during placement; ③. After placing the water jet track, turn on the switch of the walking trolley and move it forward and backward to observe whether there is a conflict between the walking trolley and the diameter-limiting plate to be cut. If there is a conflict, use a rubber hammer to tap the water jet track for adjustment; (2) The water jet nozzle installation and adjustment step includes: ①. After the water jet track is fixed, install the water jet nozzle; before installing the water jet nozzle, dredge the water jet nozzle and check whether the sealing ring of the water jet nozzle is intact; ②. After the inspection of the water jet nozzle is completed, install the water jet nozzle on the walking trolley and adjust the height and angle of the water jet nozzle through the universal joint at the connection; ③. The angle of the water jet nozzle should be perpendicular to the plate surface of the diameter-limiting plate, and at the same time observe that the cutting height of the water jet nozzle is preferably at the bottom of the diameter-limiting plate, but it should be noted that the cutting line of the water jet nozzle must be higher than the cutter seat of the cutting tool; ④. The distance between the water jet nozzle and the diameter-limiting plate is controlled within 5 mm.

4. A construction method for a water jet cutting diameter-limiting plate under high pressure in a composite stratum of a slurry shield, characterized in that, The debugging of the water jet equipment in the step (2) specifically includes the following steps: (1) During the installation of the water jet equipment, check and add abrasive to the water jet booster pump and sand tank in the water jet equipment synchronously; (2) After the installation of the in - bin water jet equipment is completed and the out - of - bin water jet booster pump and sand tank are ready, start cutting; (3) Open the ball valve of the high - pressure pipe on the bin wall in advance; (4) Turn on the water jet booster pump and adjust it to the appropriate pressure. Observe whether there is a water column spraying out from the water jet nozzle. If not, check whether the water jet nozzle is blocked and whether the ball valve of the high - pressure pipe on the bin wall is open; (5) After the water jet nozzle discharges water normally, connect the water jet controller outside the bin and conduct a trial run of the water jet again; (6) Check whether the forward and backward movement of the traveling trolley is normal and whether there are any other conflicts; if there is no abnormality in the movement, the traveling trolley returns to the cutting starting point and the water jet booster pump is turned off.

5. The construction method of the water jet cutting diameter-limiting plate under high pressure in the composite stratum of slurry shield according to claim 1, characterized in that The specific installation of the camera in step (3) includes the following steps: (1) Fix the camera above the diameter - limiting plate to be cut. The water jet operator checks through the monitor whether the angle of the camera can clearly see the direction of the water jet and the cutting state of the diameter - limiting plate; if the angle is okay, fix the camera and take protective measures for the camera; (2) After the installation of the camera is completed, fix an industrial water pipe that can be directly aimed at the camera for flushing at any time; after the personnel entering the bin fix the industrial water pipe, conduct camera flushing and observe the flushing effect and whether the angle is appropriate in the monitoring animation. If it is not appropriate, adjust it in time.

6. The construction method of the water jet cutting diameter-limiting plate under high pressure in the composite stratum of slurry shield according to claim 1, characterized in that, The pre - cutting protection in step (4) includes the following steps: (1) Protection of the diameter - limiting plate: Place a wear - resistant plate on the back of the cut diameter - limiting plate; adsorb a strong magnet on the diameter - limiting plate and tie the magnet to a firm place with a safety rope. At the same time, wind a sling and a rope around the diameter - limiting plate; (2) Protection of the surrounding tool boxes: Lay wear - resistant plates in advance at the tool box of the cut diameter - limiting plate.

7. A construction method for a water jet cutting diameter-limiting plate under high pressure in a composite stratum of a slurry shield, characterized in that, The cutting in step (5) includes the following steps: (1) Turn on the water: Open the industrial water valve, open the ball valve of the high - pressure pipe on the bin wall, and turn on the water jet booster pump; (2) Intervention of abrasive: After the pressure of the high - pressure water gun reaches the appropriate pressure, open the sand tank to add abrasive; (3) Cutting: After seeing the water column spraying out and waiting for a few seconds for the sand - water mixture, start operating the traveling trolley to move forward and start cutting; (4) Process feeding: When it is found that the water jet cannot effectively penetrate the diameter - limiting plate and there is back - water, stop to supplement the abrasive. Before adding sand, first turn off the sand tank, wait for a few seconds and then turn off the water jet booster pump. After turning off the water jet booster pump, close the ball valve of the high - pressure pipe on the bin wall at the same time; at this time, first open the pressure relief valve of the sand tank. After the pressure is released, start adding abrasive; (5) Replace the water jet nozzle: If it is found that there is no water column spraying out from the water jet nozzle and the pipeline is unobstructed, it means that the water jet nozzle is blocked or abnormally damaged and needs to be replaced.

8. The construction method of the water jet cutting diameter-limiting plate under high pressure in the composite stratum of slurry shield according to claim 1, characterized in that The specific handling of the diameter - limiting plate in step (6) includes the following steps: Bind the diameter - limiting plate firmly with a sling and adsorb it with a strong magnet for double insurance. After binding, use a chain block to lift it into the bin.

9. A construction method for water jet cutting a diameter-limiting plate under high pressure in a muddy water shield composite stratum according to claim 4, characterized in that, The specific equipment removal and relocation in step (7) includes the following steps: (1) After the diameter - limiting plate is cut, first turn off the sand tank, wait for a few seconds, then turn off the high - pressure water gun pump, cut off the power supply, close the ball valve of the high - pressure pipe on the bin wall, and enter the bin to start equipment removal; (2) After entering the warehouse, first remove the high-pressure water jet pipe, and then transfer the wear-resistant plate to the next cutting position; (3) Remove the water jet track and place it at the next cutting position.

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