An intelligent device and method for high-temperature water blowout prevention and drainage in advanced pre-grouting construction

Abstract

The present invention discloses an intelligent device and method for preventing and draining high-temperature water blowout in advance pre-grouting construction, which relates to the technical field of grouting and water blocking in tunnel engineering, including: a high-temperature water injection and rock chip simulation unit, a high-temperature water blowout prevention and drainage unit, a grouting hole drilling unit, and a master control unit. The present invention can realize the blowout prevention and drainage of high-temperature water during the grouting hole drilling process, and can better simulate the blowout prevention and drainage of high-temperature water in actual engineering. It has the advantages of high similarity, simple and convenient operation, good simulation effect, etc., avoids a series of serious effects caused by the back spray of high-temperature water during the grouting hole drilling process, ensures the safety of construction personnel and construction equipment, optimizes the construction environment, and adopts a variety of valve forms such as airbag-enclosed valves, gate valves, and one-way blowout prevention valves to ensure that valves in different positions are opened and closed in different processes during the model test, so as to realize the full process simulation of high-temperature water blowout prevention and drainage.

Description

Technical Field

[0001] The invention relates to the technical field of grouting and water blocking in tunnel engineering, and in particular to an intelligent device and method for preventing and draining high-temperature water blowout in advanced pre-grouting construction. Background Art

[0002] In recent years, as my country's railway network continues to radiate to the northwest and southwest regions where geothermal heat is more concentrated, a large number of high-geothermal tunnels will inevitably emerge during the railway construction process. Due to their excessive burial depth and the influence of magma activity and underground hot water, high-temperature surrounding rocks and high-temperature water vapor appear. During the excavation process, high-geothermal and high-temperature hot water gushes out in large quantities, with the highest water temperature reaching 60-90°C, causing the air temperature in the tunnel to exceed the safety temperature warning line. Therefore, in such an environment, the superposition effect and uncertainty of various risk factors will increase significantly during construction work, which will have a serious impact on engineering construction.

[0003] Conventional advance pre-grouting construction technology requires high-pressure air to be input from the hollow drill rod during the drilling process to facilitate the discharge of hole debris. However, when encountering high rock temperature areas and underground high-temperature water, a large amount of high-temperature water will be sprayed out of the hole mouth pipe, posing certain safety hazards to construction personnel and worsening the construction environment. At the same time, high-temperature water will be sprayed on the drilling rig equipment, causing the engine oil and hydraulic oil to emulsify due to heat, aggravating equipment wear and even causing equipment paralysis, which seriously reduces construction efficiency.

[0004] At present, for high-geotemperature tunnel construction, the temperature in the tunnel is mostly reduced by strengthening ventilation, spraying low-temperature river water, heat insulation, and advanced geological prediction drilling and drainage. There is no simulation test device for high-temperature water blowout prevention and drainage in advanced pre-grouting construction. In high-rock temperature areas, high-temperature water is prone to gushing out during the advanced pre-grouting drilling process. The existing equipment is difficult to simulate the entire process of high-temperature water blowout prevention and drainage. Only by using a high-similarity model for model testing can the on-site environment be simulated more accurately, and the test results obtained are more instructive.

[0005] Therefore, it is an urgent problem for technical personnel in this field to propose an intelligent device and method for high-temperature water blowout prevention and drainage in advance pre-grouting construction to solve the difficulties existing in the prior art. Summary of the invention

[0006] In view of this, the present invention provides an intelligent device and method for high-temperature water blowout prevention and drainage in advance pre-grouting construction, which can realize the reasonable drainage of high-temperature formation water during deep formation tunnel excavation.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A high-temperature water blowout prevention and drainage device for advanced pre-grouting construction, comprising: a high-temperature water injection and rock chip simulation unit, a high-temperature water blowout prevention and drainage unit, a grouting hole drilling unit, and a master control unit; wherein,

[0009] The high-temperature water injection and rock cuttings simulation unit is connected to the master control unit and is used to simulate the exposure of high-temperature water and the discharge of core rock cuttings;

[0010] The high-temperature water blowout prevention and drainage unit is connected to the master control unit and is used to prevent and drain the high-temperature water when the high-temperature water is exposed;

[0011] The grouting hole drilling unit is connected to the master control unit and is used for grouting drilling;

[0012] The master control unit is used to coordinate control of each unit.

[0013] The above device, optionally, the high temperature water injection and rock cuttings simulation unit is composed of a high temperature water tank, an orifice pipe, and a rock cuttings simulation device, wherein:

[0014] A temperature sensor is installed inside the high-temperature water tank, a heater is installed on the circulating water pipe outside the high-temperature water tank, and a circulating water pump, a flow sensor and a pressure sensor are installed in sequence at the water outlet of the high-temperature water tank;

[0015] The orifice pipe is a horizontal pipe with two ports opened vertically, the two vertical ports are on the same side, and are respectively a high-temperature water injection port and a cuttings injection port. One end of the horizontal pipe is buried in the slurry stop wall, and the other end is exposed from the slurry stop wall.

[0016] The rock cuttings simulation device comprises a material bin A, a material bin B, a servo motor, a material discharge valve and a rotary feeding device.

[0017] The above-mentioned device can optionally have the high-temperature water injection port and the rock cuttings addition port at the two vertical ports of the orifice pipe connected to the high-temperature water pump and the rock cuttings simulation device delivery device respectively.

[0018] The above device, optionally, the high-temperature water anti-blowout drainage unit is composed of a cold water cooling injection device, a main valve, an airbag tube valve, a plugging drainage tee, a sealing end, a high-temperature water drainage valve, a water debris filtering device, and a drainage and water discharge box;

[0019] The cold water cooling injection device, the main valve, the air bag tube valve, the blocking drainage tee, the sealing end, the high-temperature water drainage valve, and the water-chip filtering device are all sealed by sealing rings, and the water-chip filtering device is connected to the drainage box through a drainage pipe.

[0020] Optionally, the cold water cooling injection device comprises a cold water tank and a refrigerator, wherein the refrigerator is arranged on an external circulation water supply pipe of the cold water tank and is used to cool the water in the circulation process to a low temperature;

[0021] The airbag tube valve is composed of an external membrane bag joint and an internal annular airbag. The outer wall of the annular airbag is tightly fitted with the inner wall of the membrane bag joint, and the annular airbag is connected to the vent hole of the external membrane bag joint to realize the opening and closing of the valve.

[0022] The blocking drainage tee is a tee pipe with a port opened vertically on the same axis, the upper port is a low-temperature water injection port, and the lower port is connected to a high-temperature water drainage valve and a water debris filtering device to prevent drainage blockage;

[0023] The sealing end head is composed of a floating sealing end cover, a floating seal, 4 sets of perfluoroether O-rings, 1 set of radial sealing rings, and a replaceable wear-resistant ring. The sealing end head as a whole circumferentially wraps the drill rod in the rotary drilling unit in the grouting hole drilling unit. One end of the sealing end head with the floating sealing end cover is embedded in one end of the plugging and drainage tee to prevent high-temperature water and rock cuttings from spraying out along the drill rod during drilling.

[0024] In the above device, optionally, the grouting hole drilling unit includes a stepping unit and a rotary drilling unit, wherein:

[0025] The stepping unit includes a stepping motor, a feed screw, a sliding trolley, and a guide rail, and is used to control the forward and backward movement of the rotary motor;

[0026] The rotary drilling unit is installed on a sliding trolley, comprises a rotary motor and a drill rod, and is used for drilling and removing slag.

[0027] In the above-mentioned device, optionally, the master control unit is a digital integrated platform, and the test process operation of each unit can be realized through the coordinated control of the master control unit.

[0028] A method for preventing and draining high-temperature water blowout in advanced pre-grouting construction, using any of the above-mentioned devices for preventing and draining high-temperature water blowout in advanced pre-grouting construction, comprising the following steps:

[0029] S1. Pre-embed the orifice pipe in the mortar stop wall, exposing its high-temperature water injection port and the cuttings injection port, and leaving a certain distance between the high-temperature water injection port and the mortar stop wall surface;

[0030] S2. Install the blowout prevention device, install the main valve, the airbag valve and the plugging drainage tee in sequence, connect the water outlet at the lower end of the plugging drainage tee to the high-temperature water drainage valve, the water debris filter device, and the water debris filter device to the drainage box through the drainage pipe, and pre-install the sealing end on the drill pipe;

[0031] S3. Simulate the exposure of high-temperature water, drain the high-temperature water, control the main valve and the high-temperature water drainage valve to open through the main control unit, start the grouting hole drilling unit, wait for the drill rod to be in a normal drilling state, control the opening of the high-temperature water pump and the rock cuttings delivery device, inject high-temperature water and continue to add an appropriate amount of rock cuttings at the rock cuttings adding port, simulate the exposure of high-temperature water during drilling and the discharge of core rock cuttings during drilling;

[0032] S4. During the drilling process, if water leakage occurs at the sealing end, the sealing ring should be replaced in time, the airbag valve should be started, the drainage channel should be closed to stop the high-temperature water, and the sealing ring should be replaced in time. After the replacement is completed, the airbag valve should be closed and the drilling operation should continue;

[0033] S5. After the drilling operation is completed, withdraw the drill pipe. When the drill pipe is withdrawn to the rear of the main valve, close the main valve and stop the high-temperature water in time;

[0034] S6. Turn off the high-temperature water pump and proceed to the subsequent grouting process. After the grouting is completed, remove the blowout prevention unit and the slurry hole drilling unit, and proceed to the next drilling in sequence.

[0035] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides an intelligent device and method for high-temperature water blowout prevention and drainage in advanced pre-grouting construction:

[0036] (1) The present invention adopts the form of unit combination and unit integrated master control, and proposes a device for preventing and draining high-temperature water blowout during the advance pre-grouting process of deep stratum tunnels, thereby realizing the prevention and drainage of high-temperature water blowout during the grouting hole drilling process.

[0037] (2) The present invention proposes a construction process for high-temperature water blowout prevention and drainage during the advance pre-grouting of deep stratum tunnels. The process can better simulate the high-temperature water blowout prevention and drainage in actual projects, and has the advantages of high similarity, simple and convenient operation, and good simulation effect. It avoids a series of serious effects caused by high-temperature water backspray during slurry hole drilling, ensures the safety of construction personnel and construction equipment, and optimizes the construction environment.

[0038] (3) The present invention has developed a model test system for high-temperature water blowout prevention and drainage in advance pre-grouting construction, and further carried out a model test of high-temperature water blowout prevention and drainage, which can truly simulate the working conditions of high-temperature water blowout prevention and drainage in deep formation tunnels.

[0039] (4) The present invention adopts various valve forms such as airbag-enclosed valves, gate valves, and one-way blowout preventer valves to ensure that valves in different positions are opened and closed in different processes during the model test, so as to realize the whole process simulation of high-temperature water blowout prevention and drainage.

[0040] (5) The sealing end of the present invention adopts a variety of sealing measures such as floating seals, multiple sets of sealing rings, and replaceable wear-resistant sealing rings, which can prevent high-temperature water from spraying out along the drill pipe and rock cuttings from clogging during the drilling process of the drill pipe, thereby ensuring the normal operation of the drill pipe and the sealing performance during the drilling process.

[0041] (6) In the present invention, the high-temperature water tank, the cold water tank, and the drainage tank are connected by a water diversion pipe controlled by a solenoid valve, forming a self-circulating water diversion system, which can realize the recycling of water during the test and reduce the waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0043] Figure 1 A structural diagram of a high-temperature water blowout prevention and drainage device in advance pre-grouting construction provided by the present invention;

[0044] Figure 2 A schematic diagram of a high-temperature water injection and rock cuttings simulation unit provided by the present invention;

[0045] Figure 3 A schematic diagram of a high-temperature water blowout prevention and drainage unit provided by the present invention;

[0046] Figure 4 Schematic diagram of the airbag tube-enclosed valve provided by the present invention, wherein 4a is a schematic diagram of the overall structure of the airbag tube-enclosed valve, and 4b is a schematic diagram of the cross-section of the airbag tube-enclosed valve;

[0047] Figure 5 A schematic diagram of a process flow of a high-temperature water blowout prevention and drainage device in advance pre-grouting construction provided by an embodiment of the present invention;

[0048] Among them, 1-stepping motor, 2-guide rail, 3-feed screw, 4-sliding trolley, 5-rotating motor, 6-drill rod, 7-sealed end, 8-blocking drainage tee, 9-low-temperature water injection port, 10-air bag tube valve, 101-membrane bag joint, 102-annular air bag, 11-main valve, 12-orifice tube, 13-cuttings addition port, 14-high-temperature water injection port, 15-cuttings expansion port, 16-high-temperature water drainage valve, 17-water-cuttings filtering device, 18- Temperature sensor, 19-drainage box, 20-pressure sensor, 21-flow sensor, 22-circulating water pump; 23-water pipe; 24-cuttings simulation device, 241-A silo, 242-unloading valve, 243-servo motor, 244-B silo, 245-rotary feeding device, 25-water pipe valve, 26-heater, 27-high temperature water tank, 28-refrigeration machine, 29-cold water tank, 30-master control unit, 31-high temperature water pump. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Reference Figure 1 As shown, the present invention discloses a high-temperature water blowout prevention and drainage device in advance pre-grouting construction, including: a high-temperature water injection and rock chip simulation unit, a high-temperature water blowout prevention and drainage unit, a grouting hole drilling unit, and a master control unit 30; wherein,

[0051] A high-temperature water injection and rock cuttings simulation unit, connected to the main control unit 30, is used to simulate the exposure of high-temperature water and the discharge of core rock cuttings;

[0052] A high-temperature water blowout prevention and drainage unit is connected to the main control unit 30 and is used to prevent and drain the high-temperature water when the high-temperature water is exposed;

[0053] A grouting hole drilling unit, connected to the master control unit 30, for grouting drilling;

[0054] The master control unit 30 is used for coordinated control of each unit.

[0055] Furthermore, the high temperature water injection and rock cuttings simulation unit is composed of a high temperature water tank 27, an orifice pipe 12, and a rock cuttings simulation device 24, wherein:

[0056] A temperature sensor 18 is installed inside the high temperature water tank 27, a heater 26 is installed on the circulating water pipe 23 outside the high temperature water tank 27, and a circulating water pump 22, a flow sensor 21 and a pressure sensor 20 are installed in sequence at the water outlet of the high temperature water tank 27;

[0057] The orifice pipe 12 is a horizontal pipe with two ports vertically opened. The two vertical ports are on the same side, which are a high-temperature water injection port 14 and a cuttings injection port 13. One end of the horizontal pipe is buried in the mortar stop wall, and the other end is exposed from the mortar stop wall.

[0058] The cuttings simulation device 24 includes a material bin A 241 , a material bin B 244 , a servo motor 243 , a material discharge valve 242 and a rotary material feeding device 245 .

[0059] Furthermore, the high-temperature water injection port 14 and the cuttings addition port 13 at the two vertical ports of the orifice pipe 12 are connected to the high-temperature water pump 31 and the rotary feeding device 245 respectively.

[0060] Furthermore, the high-temperature water blowout prevention drainage unit is composed of a cold water cooling injection device, a main valve 11, an airbag tube valve 10, a plugging drainage tee 8, a sealing end 7, a high-temperature water drainage valve 16, a water debris filtering device 17, and a drainage and water discharge box 19;

[0061] The cold water cooling injection device, the main valve 11, the air bag valve 10, the blocking drainage tee 8, the sealing end 7, the high-temperature water drainage valve 16, and the water debris filtering device 17 are all sealed by sealing rings, and the water debris filtering device 17 is connected to the drainage box 19 through the drainage pipe.

[0062] Furthermore, the cold water cooling injection device includes a cold water tank 29 and a refrigerator 28, wherein the refrigerator is arranged on the outer circulation water supply pipe 23 of the cold water tank 29, and is used to reduce the water in the circulation process to a low temperature;

[0063] The airbag tube valve 10 is composed of an external membrane bag connector 101 and an internal annular airbag 102. The outer wall of the annular airbag 102 is tightly fitted with the inner wall of the membrane bag connector 101, and the annular airbag 102 is connected to the vent hole of the external membrane bag connector 101, which is used to realize the opening and closing of the valve;

[0064] The blocking drainage tee 8 is a tee pipe with a port opened vertically on the same axis, the upper port is a low-temperature water injection port 9, and the lower port is connected to a high-temperature water drainage valve 16 and a water debris filter 17 to prevent drainage blockage;

[0065] The sealing end head 7 is composed of a floating sealing end cover, a floating seal, 4 sets of perfluoroether O-rings, 1 set of radial sealing rings, and a replaceable wear-resistant ring. The sealing end head 7 as a whole circumferentially wraps the drill rod 6 in the rotary drilling unit in the grouting hole drilling unit. One end of the sealing end head 7 with the floating sealing end cover is embedded in one end of the sealing and drainage tee 8 to prevent high-temperature water and rock cuttings from spraying out along the drill rod during drilling.

[0066] Furthermore, the grouting hole drilling unit includes a stepping unit and a rotary drilling unit, wherein:

[0067] The stepping unit includes a stepping motor 1, a feed screw 3, a sliding carriage 4, and a guide rail 2, and is used to control the forward and backward movement of the rotary motor 5;

[0068] The rotary drilling unit is mounted on the sliding carriage 4, and comprises a rotary motor 5 and a drill rod 6, and is used for drilling and removing slag.

[0069] Furthermore, the master control unit 30 is a digital integrated platform, and the test process operations of each unit can be realized through the coordinated control of the master control unit.

[0070] In a specific embodiment, see Figure 5 The process flow diagram is shown in the figure. The specific contents are as follows:

[0071] The device includes a high-temperature water injection and cuttings simulation unit, a high-temperature water blowout prevention and drainage unit, and a grouting hole drilling unit; wherein:

[0072] See also Figure 2 As shown, the orifice pipe 12 is a horizontal pipe with two ports opened vertically, and the two vertical ports are on the same side, which are a high-temperature water injection port 14 and a cuttings addition port 13 respectively. The inner diameter of the horizontal pipe is larger than the inner diameter of the vertical pipe, and a flange is welded to each of the four horizontal and vertical ports. One horizontal end of the orifice pipe 12 is buried in the slurry stop wall, and the other end is exposed from the slurry stop wall.

[0073] The high-temperature water pump 31 is connected to the high-temperature water injection port 14 of the orifice pipe 12 through a high-temperature water injection pipe, and the high-temperature water pump 31 is used to simulate a high-temperature water source.

[0074] The exposed end of the orifice pipe 12 is connected to a high-temperature water blowout prevention and drainage unit. The high-temperature water blowout prevention and drainage unit is shown in FIG. Figure 3 As shown, the main valve 11, the airbag tube valve 10, the blocking drainage tee 8, the high-temperature water drainage valve 16, and the water debris filtering device 17 are connected in sequence, and flanges are welded at the ports of each part. The flanges of each part are connected by bolts, and the flanges are sealed by gaskets to ensure the sealing of the entire device. The initial state of each valve is open.

[0075] The main valve 11 is a gate valve, which is used to close the main valve in time after the drilling is completed and the drill bit is withdrawn to the main valve to stop the discharge of high-temperature water. As a main valve, it can also be closed in time in an emergency to stop the high-temperature water.

[0076] See also Figure 4 As shown (4a is a schematic diagram of the overall structure of the airbag tube valve, 4b is a schematic diagram of the cross-section of the airbag tube valve), the airbag tube valve 10 is composed of an annular airbag 102 inside, and the inflation port of the external membrane bag joint 101 is connected to its control device to control its inflation and deflation, that is, the opening and closing of the valve. The annular airbag 102 is made of high-strength and high-temperature resistant material. When the airbag tube valve 10 is used to replace the sealing ring of the sealing end, the closed channel is activated in time to stop the high-temperature water. After the sealing ring is replaced, the airbag tube valve 10 is opened here to continue to drain the high-temperature water;

[0077] The plugging and drainage tee 8 has a port vertically opened at the upper and lower ends, a cuttings expansion port 15 is opened at the lower side, and the low-temperature water injection port 9 at the upper side port is used to add low-temperature water. The low-temperature water cools the drill pipe 6 in time to prevent the drill pipe 6 from being overheated and affecting the drilling efficiency; the low-temperature water flushes the mud and sand to prevent the cuttings and slag from sticking to the plugging and drainage tee 8 and causing blockage; the reasonable setting of the cuttings expansion port 15 makes the drainage of high-temperature water smoother, prevents the high-temperature water from flowing too fast and causing impact on the sealing end 7, and also prevents the cuttings and slag from blocking the drainage port.

[0078] The sealing end 7 is firstly put on the drill pipe 6 during installation, and the end with the sealing ring, i.e., the end with the smaller diameter, is embedded in the horizontal port of the drainage tee 8. The sealing end 7 includes a floating sealing end cap, a floating seal, 4 sets of perfluoroether O-rings, 1 set of radial sealing rings, and replaceable wear-resistant rings. Multiple sets of seals can ensure that the sealing end 7 and the drill pipe 6 are tightly wrapped to form a good seal, so as to prevent high-temperature water from carrying rock chips to spray on the machine and construction personnel, causing safety losses to personnel and machines.

[0079] The high-temperature water drainage valve 16 is used to control the high-temperature water drainage speed, and the high-temperature water is drained away from the tunnel face and the construction area through the high-temperature water drainage pipe.

[0080] The water diversion pipe valve 25 controls the water flow rate of the water diversion pipe 23 by opening and closing.

[0081] The grouting hole drilling unit is divided into two sub-units: a stepping unit and a rotary drilling unit. The stepping unit includes a stepping motor 1, a feed screw 3, a sliding trolley 4, and a guide rail 2, and is used to control the forward and backward movement of the rotary motor 5; the rotary drilling unit is installed on the sliding trolley 4, and includes a rotary motor 5 and a drill rod 6, and is used for drilling and slag removal; during the drilling process, the two units work together to coordinate operations and control the drilling speed.

[0082] and Figure 1Corresponding to the above device, the embodiment of the present invention also provides a high temperature water anti-blowout drainage method in advance pre-grouting construction, which is used for Figure 1 The specific implementation of the device in the embodiment includes the following steps:

[0083] S1. Pre-buried orifice pipe 12, the orifice pipe 12 is pre-buried in the stop wall, exposing the high-temperature water injection port 14 and the cuttings addition port 13, the high-temperature water injection port 14 and the stop wall wall to leave a certain distance;

[0084] S2. Install the blowout prevention device, install the main valve 11, the airbag valve 10 and the plugging drainage tee 8 in sequence, plug the drainage tee 8 and connect the high-temperature water drainage valve 16, the water debris filter 17, the water debris filter 17 is connected to the drainage box 19 through the drainage pipe, and the sealing end 7 is pre-installed on the drill pipe 6;

[0085] S3. Simulate the exposure of high-temperature water, drain high-temperature water, control the main valve 11 and the high-temperature water drainage valve 16 to open through the main control unit 30, start the grouting hole drilling unit, wait for the drill rod 6 to be in a normal drilling state, control the opening of the high-temperature water pump 31 and the cuttings simulation device 24, inject high-temperature water and continue to add an appropriate amount of cuttings to the cuttings adding port, simulate the exposure of high-temperature water during drilling and the core cuttings discharged during drilling;

[0086] S4. During the drilling process, if water leakage occurs at the sealing end 7, the sealing ring should be replaced in time, the airbag valve 10 should be started, the drainage channel should be closed to stop the high-temperature water, and the sealing ring should be replaced in time. After the replacement is completed, the airbag valve 10 should be closed and the drilling operation should continue;

[0087] S5. After the drilling operation is completed, the drill pipe is withdrawn. When the drill pipe is withdrawn to the rear of the main valve 11, the main valve 11 is closed to stop the high-temperature water in time;

[0088] S6. Turn off the high-temperature water pump 31 and carry out the subsequent grouting process. After the grouting is completed, remove the blowout prevention unit and the slurry hole drilling unit, and carry out the next drilling in sequence.

[0089] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-temperature water blowout prevention and drainage device for advanced pre-grouting construction, characterized in that: include: High-temperature water injection and cuttings simulation unit, high-temperature water blowout prevention and drainage unit, grouting hole drilling unit, and master control unit; among them, The high-temperature water injection and rock cuttings simulation unit is connected to the master control unit and is used to simulate the exposure of high-temperature water and the discharge of core rock cuttings; The high-temperature water blowout prevention and drainage unit is connected to the master control unit and is used to prevent and drain the high-temperature water when the high-temperature water is exposed; The grouting hole drilling unit is connected to the master control unit and is used for grouting drilling; The master control unit is used to coordinate control of each unit; The high-temperature water injection and rock chip simulation unit is composed of a high-temperature water tank, an orifice pipe, and a rock chip simulation device, wherein: A temperature sensor is installed inside the high-temperature water tank, a heater is installed on the circulating water pipe outside the high-temperature water tank, and a circulating water pump, a flow sensor and a pressure sensor are installed in sequence at the water outlet of the high-temperature water tank; The orifice pipe is a horizontal pipe with two ports opened vertically, the two vertical ports are on the same side, and are respectively a high-temperature water injection port and a cuttings injection port. One end of the horizontal pipe is buried in the slurry stop wall, and the other end is exposed from the slurry stop wall. The rock cuttings simulation device comprises a material bin A, a material bin B, a servo motor, a material discharge valve and a rotary feeding device; The high-temperature water injection port and the rock cuttings addition port at the two vertical ports of the orifice pipe are respectively connected to the high-temperature water pump and the rock cuttings simulation device delivery device; The high-temperature water blowout prevention drainage unit is composed of a cold water cooling injection device, a main valve, an airbag tube valve, a plugging drainage tee, a sealing end, a high-temperature water drainage valve, a water debris filtering device, and a drainage and water discharge box; The cold water cooling injection device, the main valve, the airbag tube valve, the blocking drainage tee, the sealing end, the high-temperature water drainage valve, and the water debris filtering device are all sealed by sealing rings, and the water debris filtering device is connected to the drainage and drainage box through a drainage and drainage pipe; The cold water cooling injection device comprises a cold water tank and a refrigerator, wherein the refrigerator is arranged on the outer circulation water supply pipe of the cold water tank and is used to reduce the water in the circulation process to a low temperature; The airbag tube valve is composed of an external membrane bag joint and an internal annular airbag. The outer wall of the annular airbag is tightly fitted with the inner wall of the membrane bag joint, and the annular airbag is connected to the vent hole of the external membrane bag joint to realize the opening and closing of the valve. The blocking drainage tee is a tee pipe with a port opened vertically on the same axis, the upper port is a low-temperature water injection port, and the lower port is connected to a high-temperature water drainage valve and a water debris filtering device to prevent drainage blockage; The sealing end head is composed of a floating sealing end cover, a floating seal, 4 sets of perfluoroether O-rings, 1 set of radial sealing rings, and a replaceable wear-resistant ring. The sealing end head as a whole circumferentially wraps the drill rod in the rotary drilling unit in the grouting hole drilling unit. One end of the sealing end head with the floating sealing end cover is embedded in one end of the plugging and drainage tee to prevent high-temperature water and rock cuttings from spraying out along the drill rod during drilling; The grouting hole drilling unit includes a stepping unit and a rotary drilling unit, wherein: The stepping unit includes a stepping motor, a feed screw, a sliding trolley, and a guide rail, and is used to control the forward and backward movement of the rotary motor; The rotary drilling unit is installed on a sliding trolley, comprises a rotary motor and a drill rod, and is used for drilling and removing slag.

2. According to the high-temperature water blowout prevention and drainage device in advance pre-grouting construction according to claim 1, it is characterized in that: The master control unit is a digital integrated platform, and the test process operation of each unit can be achieved through the coordinated control of the master control unit.

3. A method for preventing high-temperature water blowout and drainage in advanced pre-grouting construction, characterized in that: The high-temperature water blowout prevention and drainage device in the advanced pre-grouting construction according to any one of claims 1 to 2 is applied, comprising the following steps: S1. Pre-embed the orifice pipe in the mortar stop wall, exposing its high-temperature water injection port and the cuttings injection port, and leaving a certain distance between the high-temperature water injection port and the mortar stop wall surface; S2. Install the blowout prevention device, install the main valve, the airbag valve and the plugging drainage tee in sequence, connect the water outlet at the lower end of the plugging drainage tee to the high-temperature water drainage valve, the water debris filter device, and the water debris filter device to the drainage box through the drainage pipe, and pre-install the sealing end on the drill pipe; S3. Simulate the exposure of high-temperature water, drain the high-temperature water, control the main valve and the high-temperature water drainage valve to open through the main control unit, start the grouting hole drilling unit, wait for the drill rod to be in a normal drilling state, control the opening of the high-temperature water pump and the rock cuttings delivery device, inject high-temperature water and continue to add an appropriate amount of rock cuttings at the rock cuttings adding port, simulate the exposure of high-temperature water during drilling and the discharge of core rock cuttings during drilling; S4. During the drilling process, if water leakage occurs at the sealing end, the sealing ring should be replaced in time, the airbag valve should be started, the drainage channel should be closed to stop the high-temperature water, and the sealing ring should be replaced in time. After the replacement is completed, the airbag valve should be closed and the drilling operation should continue; S5. After the drilling operation is completed, withdraw the drill pipe. When the drill pipe is withdrawn to the rear of the main valve, close the main valve and stop the high-temperature water in time; S6. Turn off the high-temperature water pump and proceed to the subsequent grouting process. After the grouting is completed, remove the blowout prevention unit and the slurry hole drilling unit, and proceed to the next drilling in sequence.

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