A tool joint for long-distance rock pipe jacking, its application and construction method

Abstract

The present invention relates to a tool joint for long-distance rock pipe jacking, its application and construction method, which includes a housing, a mud pressure system, a detection component, a rock debris blocking component, a control system, a force transmission inductor, a relay cylinder and a hydraulic station. Among them, the mud pressure system, the detection component, the force transmission inductor, the relay cylinder and the hydraulic station are all installed in the housing, and the rock debris blocking component is located outside the housing; the mud pressure system includes a mud pumping pump, an extrusion pump, a mud pressure main pipe, a mud pressure branch pipe and a mud pressure hole; the mud pressure main pipe is communicated with the grouting pipeline at the starting end, and the grouting pipeline is connected to the mud pumping pump and the extrusion pump; the detection component and the force transmission inductor are both electrically connected to the control system. The tool joint of the present invention can reduce the jacking friction resistance, prevent the accumulation of rock debris, ensure the correct attitude of the pipe joint, and reduce the whiplash effect; at the same time, it can also provide the function of relay force. Compared with the prior art, it can greatly reduce the use cost of the drag reduction mud, reduce the layout of the grouting pipes in the pipe joint, the overall structure is simple, easy to operate, has strong practicability and obvious economic benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe jacking engineering, and particularly relates to a tool joint for long-distance rock pipe jacking, its application, and a construction method. Background Art

[0002] In recent years, with the rapid development of underground pipe networks in China, trenchless technologies have been increasingly applied in the construction of public pipelines such as water supply, drainage, gas, and telecommunication cables. Among them, pipe jacking technology is the most representative.

[0003] When constructing by the existing long-distance pipe jacking method, the following problems exist:

[0004] 1) As the requirements of the project develop higher and higher, the single jacking length sometimes reaches 500 meters, 800 meters, or even 1000 meters. Since the pipe jacking pipe joints adopt a socket and spigot flexible connection method, as the jacking distance becomes longer, the trajectory of the pipe jacking is prone to bending and arching like a snake swimming, and the attitude is uncontrollable.

[0005] 2) When the pipe jacking machine jacks, the force on the head of the machine is not only a single vertical force but also has a lateral component force. Originally, the pipe jacking machine should jack forward along the design axis. However, affected by the lateral component force, and when jacking in a rock formation, more rock cuttings are generated, the rock hardness is high, and the rock cuttings are not easily extruded into the surrounding formation. As the jacking distance becomes longer, more rock cuttings accumulate. When the pipe jacking machine is hydraulically corrected, the head of the pipe jacking machine is prone to being held and jacked forward or twisted, resulting in the pipe jacking machine deviating and the jacking trajectory being wavy. The influence of the lateral force and rock cuttings makes the pipe jacking deviation correction ineffective. For example, the gap in the overexcavation range of the pipe jacking machine is conventionally reserved at 25 mm, and generally 35 - 45 mm in a sandy pebble formation. After grouting during jacking, the gap is only 5 mm, and on the other side, it may become 40 mm, or even 45 mm or 50 mm, making it difficult to control the jacking attitude.

[0006] 3) When long-distance pipe jacking is carried out, the voids can be filled with slurry. However, traditional thixotropic slurry has a low concentration, is prone to hydration and segregation, and has poor stability. It is prone to leakage, loss, or hydration, etc. After grouting and filling, it cannot form a complete and effective slurry sleeve in the gap between the pipe jacking machine, pipe joints, and the soil body, cannot play a role in restraining the deviation and swing of the pipe joints, cannot support the pipe joints, and the resistance reduction effect is not ideal. It also cannot wrap and carry away rock cuttings when jacking in a rock formation, resulting in a large amount of rock cuttings accumulating at the bottom of the head of the pipe jacking machine, causing the jacking attitude to float upward and the whiplash effect to be obvious.

[0007] 4) Affected by multiple factors, as the jacking distance becomes longer, it is not easy to control the jacking force of the pipe jacking machine. Too small a jacking force will result in insufficient penetration force of the cutter head into the rock and soil mass of the excavation face, leading to difficult tunneling and difficult control of the jacking attitude.

[0008] 5) During long-distance pipe jacking, as the jacking distance increases, when the jacking force provided by the main jacking station at the rear cannot meet the requirements of long-distance jacking, a relay station is set as a relay reserve. After the jacking is completed, the relay station remains in the tunnel and cannot be removed. The longer the jacking distance, the more relay stations are required, and multiple relay stations will be wasted in a single project, resulting in high cost investment.

[0009] In summary, when encountering geological conditions such as pebble formations, collapsible loess, rock formations, and fault zones, the existence of the above problems will affect the construction safety, quality, and efficiency of long-distance pipe jacking, and the investment cost is also high, which is particularly prominent in long-distance rock pipe jacking. Summary of the Invention

[0010] The purpose of the present invention is to propose a tool section for long-distance rock pipe jacking. The mud pressing system intermittently presses composite mud to the outside of the tool section, so that the shell of the pipe jacking machine and the tool section is surrounded by composite mud, which can solve the problems that traditional thixotropic mud is difficult to form a complete mud jacket, cannot provide a certain buoyancy to support the pipe section, cannot effectively support the pipe jacking machine and the surrounding rock and soil of the pipe section, cannot eliminate rock debris and effectively reduce the frictional resistance, and cannot effectively ensure the pipe section attitude and reduce the whiplash effect.

[0011] Another purpose of the present invention is to propose an application of a tool section for long-distance rock pipe jacking. The tool section is installed between the pipe jacking machine and several pipe sections or between several pipe sections. Through the front and rear two mud injection systems of the pipe jacking machine head and the tool section, the composite mud can form a complete and effective mud jacket on the outside of the pipe section, which can reduce the frictional resistance, eliminate the influence of rock debris, ensure the controllability of the jacking attitude, and reduce the whiplash effect. In addition, a force transmission sensor is set on the tool section. When the sensor monitors that the jacking force transmitted from the rear pipe section is insufficient, the relay oil cylinder of the tool section should be started to provide additional jacking force to ensure the smooth jacking of long-distance pipe jacking. Avoid the cost waste caused by setting multiple relay stations separately during conventional long-distance pipe jacking construction.

[0012] Still another purpose of the present invention is to propose a construction method of a tool section for long-distance rock pipe jacking, which can calculate the amount of mud pressed into the rock and soil by the current mud pressing system. Through a special composite mud mixing equipment, the composite mud is directly transported to the tool section after being stirred and formed at the starting end. There is no need to arrange grouting holes and grouting pipes on the standard pipe section, and only by injecting composite mud at the two positions of the machine head and the tool section can meet the jacking requirements, which will greatly reduce the cost compared with the traditional use of thixotropic mud, and can also reduce the consumption and waste of composite mud.

[0013] To achieve the above object, the present invention provides the following technical solutions:

[0014] A tool joint for long-distance rock pipe jacking, comprising a housing, a mud pressing system, a detection component, a rock debris blocking component, a control system, a force transmission sensor, a relay oil cylinder and a hydraulic station. The mud pressing system and the detection component are both installed inside the housing, and the rock debris blocking component is installed outside the housing;

[0015] The mud pressing system includes a mud pumping pump, an extrusion pump, a mud pressing main pipe, mud pressing branch pipes and mud pressing holes. The output end of the mud pumping pump is connected to the mud pressing main pipe. The input end of the mud pressing main pipe is connected and communicated with the grouting system at the starting end. An extrusion pump is provided between the mud pressing main pipe and the mud pressing branch pipes. The output end of the mud pressing main pipe is connected and communicated with the input end of the mud pressing branch pipes. The output end of the mud pressing branch pipes is connected and communicated with the mud pressing holes. The rock debris blocking component is arranged opposite to the mud pressing holes, and the rock debris blocking component is used to prevent rock debris from depositing. The detection component is used to detect the pressure and flow rate of the mud pressing system, and the detection component is electrically connected to the control system;

[0016] The control system includes an initial data input module, a flow rate module, a theoretical mud pressing module, an actual mud pressing module and an actual mud supplementing module. The initial data input module is used to set the inner diameter of the mud pressing branch pipes as d and set the inner cross-sectional area of the mud pressing branch pipes as A1;

[0017] The flow rate module is used to calculate the flow rate Q of the composite mud;

[0018] The theoretical mud pressing module is used to calculate the theoretical mud pressing volume V1 of the composite mud;

[0019] The actual mud pressing module is used to calculate the actual mud pressing volume V2 of the composite mud;

[0020] The actual mud supplementing module is used to calculate the actual mud supplementing volume V3 of the composite mud;

[0021] The force transmission sensor is installed at the front end of the housing and is used to monitor the jacking force transmitted from the pipe joint behind the housing. The relay oil cylinder is located at the front end of the housing and is used to provide additional jacking force required for the pipe jacking machine or the pipe joint to jack forward. The hydraulic station is located in the middle of the housing and provides a power source for the additional jacking force required for the pipe jacking machine or the pipe joint to jack forward.

[0022] Optionally, an extrusion pump is provided between the mud pressing main pipe and the mud pressing branch pipes.

[0023] Optionally, the detection component includes a pressure gauge, a flow rate gauge and an electromagnetic valve. The pressure gauge is located between the mud pressing branch pipe and the mud pressing hole. The flow rate gauge is located between the mud pressing branch pipe and the mud pressing hole. The electromagnetic valve is located between the mud pressing branch pipe and the mud pressing hole.

[0024] Optionally, the debris blocking member is arranged circumferentially along the tool joint and is in a circular ring shape, and the cross-sectional shape of the debris blocking member is a wedge shape.

[0025] Optionally, a plurality of sealing plates are provided on the inner wall of the housing, and the plurality of sealing plates are respectively arranged at the input ends of the mud pressing holes, and the sealing plates correspond to the mud pressing holes one by one.

[0026] Optionally, in the initial data input module, the inner cross-sectional area of the mud pressing branch pipe is A1 = [π·(d / 2) 2 ;

[0027] The flow rate module is specifically configured to calculate the flow rate of the composite mud by collecting the time t for injecting the composite mud into the soil body through the mud pressing branch pipe and the mud pressing hole, and the flow velocity v of the composite mud where t = [t1,..., t2];

[0028] The theoretical mud pressing module is specifically configured to calculate the cross-sectional area of the tunnel excavation range as A2 = π·[(D + Δ) / 2] by obtaining the length S of the jacking of the pipe jacking machine, the outer diameter D of the tool joint housing (or pipe joint), and the spacing Δ between the housing and the tunnel 2 , the cross-sectional area of the tool joint is A3 = π·(D / 2) 2 , and then calculate the theoretical mud pressing amount of the composite mud as V1 = (A2 - A3)·S;

[0029] The actual mud pressing module is specifically configured to calculate the actual mud pressing amount V2 of the composite mud as V2 = f1·V1 by setting the difference coefficient f1 between the actual mud pressing amount V2 and the theoretical mud pressing amount V1;

[0030] The actual mud replenishing module is specifically configured to calculate the actual mud replenishing amount V3 of the actual mud replenishing module as V3 = f2·V1 by the difference coefficient f2 between the actual mud replenishing amount V3 and the theoretical mud pressing amount V1.

[0031] An application of a tool joint for long-distance rock pipe jacking includes the tool joint for long-distance rock pipe jacking, a pipe jacking machine, and a pipe jacking pipe joint as described above;

[0032] The rear end of the pipe jacking machine is fixedly connected to the pipe jacking pipe joint, and the tool joint for long-distance rock pipe jacking is located in the middle of the plurality of pipe joints. The number of the tool joints is determined according to the engineering situation.

[0033] A construction method of the tool joint for long-distance rock pipe jacking as described in one item includes:

[0034] During the first mud pressing process and the subsequent mud pressing processes of the tool joint for long-distance rock pipe jacking, the output amount of the composite mud of the mud pressing system is controlled through the following steps:

[0035] S1. Set the diameter of the sludge pressure branch pipe as d, and calculate the internal cross-sectional area of the sludge pressure branch pipe as A1 = [π·(d / 2) 2 ;

[0036] S2. Collect the time t for the sludge pressure branch pipe and the sludge pressure holes to inject the composite slurry into the soil body, and the flow rate v of the composite slurry, and calculate the flow rate of the composite slurry as where t = [t1,...,t2];

[0037] S3. Set the jacking length of the pipe jacking machine as S, the diameter of the housing 1 as D, and the spacing between the housing and the tunnel as Δ, then the cross-sectional area of the tunnel excavation is A2 = π·[(D + Δ) / 2] 2 , and the cross-sectional area of the housing 1 is A3 = π·(D / 2) 2 , and calculate the theoretical sludge pressure volume of the composite slurry as V1 = (A2 - A3)·S;

[0038] S4. Set the difference coefficient between the actual sludge pressure volume V2 and the theoretical sludge pressure volume V1 as f1, calculate the actual sludge pressure volume of the composite slurry as V2 = f·V1, and then control the output volume of the composite slurry of the sludge pressure system according to the actual sludge pressure volume V2 of the composite slurry;

[0039] S5. Set the difference coefficient between the actual mud replenishment volume V3 and the theoretical sludge pressure volume V1 as f2, calculate the actual mud replenishment volume of the composite slurry as V3 = f1·V1, and then control the output volume of the composite slurry of the sludge pressure system according to the actual grouting volume mud replenishment volume V3 of the composite slurry.

[0040] Optionally, the value range of the difference coefficient f1 is 2 - 2.5; the value range of the difference coefficient f2 is 1 - 1.3.

[0041] Optionally, the composite slurry comprises the following raw materials in parts by mass: 100 parts of water, 45 parts of expansive soil, and 1 part of additive;

[0042] The additive comprises sodium carboxymethyl cellulose and soda ash.

[0043] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0044] 1. This solution uses the mud pressing system of the tool section and the manufactured composite mud to replace the traditional thixotropic mud. This composite mud is not prone to segregation, hydration, or hardening, has strong volume stability, and can form a complete and effective mud jacket on the outer sides of the pipe section and the pipe jacking machine. It generates a certain buoyancy to support the pipe section, enabling the pipe section to rub against the thick mud instead of the soil mass, thereby reducing the jacking friction resistance. It can effectively support the pipe jacking machine and the surrounding rock and soil mass outside the pipe section, increase the damping coefficient during pipe jacking, reduce the deviation amplitude of the pipe section, and also wrap and carry away rock debris to prevent rock debris from accumulating at the bottom of the pipe jacking head, effectively ensuring the pipe section posture and reducing the whip effect.

[0045] 2. Install the tool section in the middle of the pipe jacking machine and several pipe sections. Through the two front and rear mud injection systems of the pipe jacking machine head and the intermediate tool section, the composite mud can form a complete and effective mud jacket on the outer side of the pipe section, reducing the friction resistance, eliminating the influence of rock debris, ensuring controllable jacking posture, and reducing the whip effect. In addition, a force transmission sensor is set on the tool section. When the sensor detects insufficient jacking force transmitted from the rear pipe section, the relay cylinder of the tool section is activated to provide additional jacking force, ensuring smooth jacking of long-distance pipe jacking. This avoids the cost waste caused by separately setting multiple relay chambers during conventional long-distance pipe jacking construction.

[0046] 3. This solution can calculate the amount of mud pressed into the rock and soil by the current mud pressing system. Through a dedicated composite mud mixing equipment, the composite mud is directly transported to the tool section after being mixed and formed at the starting end. There is no need to arrange grouting holes and grouting pipes on the standard pipe section, and only the composite mud needs to be injected at two positions of the machine head and the intermediate tool section. Compared with the traditional method of arranging grouting pipes on each pipe section and injecting thixotropic mud, it will significantly reduce the mud cost and reduce the consumption and waste of the composite mud. Description of the Drawings

[0047] Figure 1 is a schematic diagram of a tool section for long-distance rock pipe jacking according to an embodiment of the present invention;

[0048] Figure 2 is a schematic diagram of a detection component in a tool section for long-distance rock pipe jacking according to an embodiment of the present invention;

[0049] Figure 3 is Figure 1 the enlarged view in

[0050] Figure 4 is a schematic diagram of a sealing plate in a tool section for long-distance rock pipe jacking according to an embodiment of the present invention;

[0051] Figure 5 is an application schematic diagram of a tool section for long-distance rock pipe jacking according to an embodiment of the present invention;

[0052] Among them, 1. housing; 10. sealing plate; 2. mud pressing system; 21. mud pressing main pipe; 22. mud pressing branch pipe; 23. mud pressing hole; 24. extrusion pump; 3. detection component; 31. pressure gauge; 32. flow meter; 33. solenoid valve; 4. rock debris blocking member; 5. pipe jacking machine; 6. pipe segment. Specific embodiments

[0053] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0054] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying 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 thus should not be construed as limiting the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features, used to distinguish and describe features, without order or importance.

[0055] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] The following combines Figures 1 to 5 , and describes a tool joint for long-distance rock pipe jacking in an embodiment of the present invention.

[0058] A tool joint for long-distance rock pipe jacking, characterized in that it includes a housing 1, a mud pressing system 2, a detection component 3, a rock debris blocking member 4, a control system, a force transmission sensor (not shown in the figure), a relay oil cylinder (not shown in the figure), and a hydraulic station (not shown in the figure). The mud pressing system 2 and the detection component 3 are both installed on the inner wall of the housing 1, and the rock debris blocking member 4 is installed on the outside of the housing 1;

[0059] The mud pressing system 2 includes a mud pumping pump (not shown in the figure), a mud pressing main pipe 21, a mud pressing branch pipe 22, and a mud pressing hole 23; the input end of the mud pressing main pipe 21 is communicated with an external mud pressing system, the output end of the mud pressing main pipe 21 is communicated with the input end of the mud pressing branch pipe 22, and the output end of the mud pressing branch pipe 22 is communicated with the mud pressing hole 23;

[0060] The rock debris blocking member 4 is arranged opposite to the mud pressing hole 23, and the rock debris blocking member 4 is used to prevent rock debris from depositing; the detection assembly 3 is used to detect the pressure and flow rate of the mud pressing system 2, and the detection assembly 3 is electrically connected to the control system;

[0061] The control system includes an initial data input module, a flow rate module, a theoretical mud pressing module, an actual mud pressing module, and an actual mud replenishing module; the initial data input module is used to set the inner diameter of the mud pressing branch pipe 22 as d and set the inner cross-sectional area of the mud pressing branch pipe 22 as A1;

[0062] The flow rate module is used to calculate the flow rate Q of the composite mud;

[0063] The theoretical mud pressing module is used to calculate the theoretical mud pressing volume V1 of the composite mud;

[0064] The actual mud pressing module is used to calculate the actual mud pressing volume V2 of the composite mud;

[0065] The actual mud replenishing module is used to calculate the actual mud replenishing volume V3 of the composite mud.

[0066] The force transmission sensor is installed at the front end of the housing and is used to monitor the jacking force transmitted by the pipe section behind the housing. The relay oil cylinder is located at the front end of the housing and is used to provide additional jacking force required for pipe section jacking. The hydraulic station is located in the middle of the housing and provides a power source for the additional jacking force required for pipe section jacking.

[0067] A tool joint for long-distance rock pipe jacking prepared by this solution is installed between the pipe sections 6 of the pipe jacking. The mud pressing main pipe 21 in the tool joint continuously conveys the composite mud to the mud pressing branch pipe 22, and the composite mud is discharged from the mud pressing hole 23 and injected into the soil body, so that the outer sides of the pipe section 6 of the pipe jacking and the tool joint are surrounded by the composite mud, forming a complete mud jacket.

[0068] The present invention provides a tool joint for long-distance rock pipe jacking. The mud injection pipeline mud injection system intermittently injects composite mud to the outside of the tool joint, so that the shell of the pipe jacking machine and the tool joint is surrounded by the composite mud, which can solve the problems that the traditional thixotropic mud is difficult to form a complete mud jacket, cannot provide a certain buoyancy to support the pipe joint, cannot effectively support the pipe jacking machine and the surrounding rock and soil outside the pipe joint, cannot eliminate rock debris and reduce frictional resistance, and cannot effectively ensure the attitude of the pipe joint and reduce the whip effect.

[0069] In the past, the used mud was thixotropic mud with a low concentration and a small thixotropic mud pressure. After the original rock and soil body on the excavation surface is cut, rock debris will be generated. Under the action of the circulation of the mud in the pipe jacking machine 5 (the mud pressure is very high, several times that of the thixotropic mud pressure), the rock debris will be washed from the gap outside the cutter head of the pipe jacking machine 5 to the gap between the outer wall of the pipe jacking machine 5 and the outer wall of the pipe jacking pipe joint 6 and the surrounding rock and soil. Since the thixotropic mud pressure is small and the concentration is small, the rock debris is relatively easy to deposit at the bottom of the tunnel excavated by the pipe jacking. Since the rock debris is solid particles, when it accumulates more and more, it will cause the pipe jacking machine 5 and the subsequent pipe joints to have an upward movement trend, resulting in the deviation of the attitude of the pipe jacking pipe joint 6 from the designed axis and the increase of the pipe jacking force.

[0070] Therefore, the mud injection branch 22 intermittently injects composite mud to the outside of the tool joint. The pressure of the composite mud is not high, and the materials in the composite mud have a certain adsorption effect on the rock debris, making the rock debris not easy to deposit in the composite mud. In addition, the composite mud itself has a large concentration and is not easy to leak in complex strata (such as gravel with large voids) and has good stability, so as to ensure less deposition of rock debris. According to the above advantages of the composite mud, the composite mud can fill the gap outside the tool joint and the pipe jacking machine, so that the outside of the pipe jacking machine and the tool joint is surrounded by the composite mud, forming a complete mud jacket, thereby effectively improving the drag reduction effect and solving the problems that the traditional thixotropic mud is difficult to form a complete mud jacket, cannot effectively play the role of supporting the stability of the surrounding rock and achieve the effect of lubricating and reducing resistance.

[0071] Through the front and back two mud injection systems of the pipe jacking machine head and the intermediate tool joint, the composite mud can form a complete and effective mud jacket outside the pipe joint, which can eliminate the influence of rock debris, reduce the frictional resistance, ensure the controllable jacking attitude, and reduce the whip effect; in addition, a force transmission sensor is set on the tool joint. When the sensor monitors that the jacking force transmitted from the rear pipe joint is insufficient, the relay oil cylinder of the tool joint should be started to provide additional jacking force to ensure the smooth jacking of the long-distance pipe jacking.

[0072] The debris blocking member 4 can block a part of the debris in front of the debris blocking member 4 and discharge a small part of the debris from next to the pipe jacking machine 5 or the pipe section, so that it is wrapped by the outer side of the composite mud instead of the inner layer. Thus, the situation of debris deposition at the bottom of the pipe jacking machine 5 or the pipe section is further reduced. In addition, it is worth noting that the debris blocking member 4 is arranged on the outer side of the housing 1, and the debris blocking member 4 has a certain thickness, and this thickness is smaller than the gap between the pipe section and the soil body to avoid jamming.

[0073] Among them, this solution is also provided with a control system. For the convenience of construction, the control system is generally installed on the ground surface. The control system is provided with an initial data input module, a flow rate module, a theoretical mud injection module and an actual mud injection module. Through the mutual cooperation of the initial data input module and the flow rate module, the flow rate Q of the composite mud can be known in real time. According to the theoretical mud injection module and the actual mud injection module, the actual mud injection volume V2 required to form a complete mud jacket currently can be calculated, and then according to the real-time data of the flow rate module, the mud injection system 2 can be timely closed to avoid the mud injection system 2 transporting too much composite mud and reducing the consumption and waste of the composite mud.

[0074] Specifically, an extrusion pump 24 is provided between the mud injection main pipe 21 and the mud injection branch pipe 22.

[0075] The extrusion pump 24 can transport the composite mud in the mud injection main pipe 21 into the mud injection branch pipe 22. When the flow rate in the mud injection branch pipe 22 is small and the pressure is small, the extrusion pump 24 can transport a large amount of composite mud into the mud injection branch pipe 22 within a unit time, so that the pressure value and the flow rate of the composite mud in the mud injection branch pipe 22 can reach the specified range value.

[0076] Specifically, the detection assembly 3 includes a pressure gauge 31, a flow rate gauge 32 and an electromagnetic valve 33. The pressure gauge 31 is located between the mud injection branch pipe 22 and the mud injection hole 23, the flow rate gauge 32 is located between the mud injection branch pipe 22 and the mud injection hole 23, and the electromagnetic valve 33 is located between the mud injection branch pipe 22 and the mud injection hole 23.

[0077] The pressure gauge 31 can always detect the pressure value in the mud injection system 2. Through the pressure value, not only can the concentration value of the composite mud be judged, but also the situation of whether the composite mud can be injected to the outside of the tool section for filling can be determined. When the concentration of the composite mud is large and the pressure is too small, normal mud injection cannot be carried out, and when the pressure is too large, the influence on the external soil body is greater. The flow rate gauge 32 and the electromagnetic valve 33 can jointly control the total mud injection volume. The flow rate gauge 32 can always detect the flow rate of the mud injection system 2, so that the amount of composite mud pumped out by the mud injection system 2 within a unit time can be calculated. When the flow rate shown on the flow rate gauge 32 per unit time reaches the requirement of the actual mud injection volume, the electromagnetic valve 33 is closed.

[0078] Specifically, the debris blocking member 4 is arranged circumferentially along the housing. The debris blocking member 4 is in a circular ring shape, and the cross-sectional shape of the debris blocking member 4 is wedge-shaped. The front end face of the debris blocking member 4 is a vertical plane for blocking part of the debris, and the outer end face is an inclined plane for discharging the debris on the outside. The inner side of the debris blocking member 4 is oppositely arranged with the mud injection hole 23 for guiding the compound mud, and chamfering treatment is performed at the intersection of the end faces. The thickness of the debris blocking member 4 is less than the gap between the tool joint and the soil body.

[0079] As the pipe jacking machine 5 advances, the moving directions of the debris and stones are opposite to the advancing direction of the pipe jacking machine 5. At this time, the debris and stones will accumulate in the housing 1 of the tool joint, increasing the resistance for the housing 1 to advance forward.

[0080] Among them, the debris blocking member 4 is installed at the front end of the housing 1, so as to block and discharge the debris and stones, enabling the debris and stones to move to the outside of the housing 1. At this time, the discharged debris and stones are carried and separated by the compound mud, thus avoiding the situation where the debris and stones are deposited on the outside of the tool joint and rubbing against the pipe joint 6.

[0081] It should be noted that through the combined action of the debris blocking member 4 and the compound thick mud, it is also possible to effectively prevent a large amount of debris from depositing in the gap between the tool joint and the geotechnical body, reducing the frictional resistance and the risk of pose deviation suffered by the pipe jacking machine 5.

[0082] Specifically, a plurality of sealing plates 10 are provided on the inner wall of the housing 1. The plurality of sealing plates 10 are respectively arranged at the input ends of the mud injection holes 23, and the sealing plates 10 correspond to the mud injection holes 23 one by one. The sealing plates 10 are installed on the inner wall of the housing 1 to fix the mud injection holes 23 and reduce the occurrence of slurry leakage.

[0083] Specifically, in the initial data input module, the inner cross-sectional area of the mud injection branch pipe 22 is A1 = [π·(d / 2) 2 ;

[0084] The flow rate module is specifically to calculate the flow rate of the compound mud by collecting the time t for injecting the compound mud into the soil body through the mud injection branch pipe 22 and the mud injection hole 23, and the flow velocity v of the compound mud where t = [t1,..., t2];

[0085] The theoretical mud injection module is specifically to calculate the cross-sectional area of the tunnel excavation range as A2 = π·[(D + Δ) / 2] 2 , the cross-sectional area of the housing is A3 = π·(D / 2) 2 , and then calculate the theoretical mud injection volume of the compound mud as V1 = (A2 - A3)·S;

[0086] The actual mud pressing module specifically calculates the actual mud pressing volume V2 of the composite slurry by setting the difference coefficient f1 between the actual mud pressing volume V2 and the theoretical mud pressing volume V1, i.e., V2 = f1·V1;

[0087] The actual mud replenishing module specifically calculates the actual mud replenishing volume V3 of the actual mud replenishing module by the difference coefficient f2 between the actual mud replenishing volume V3 and the theoretical mud pressing volume V1, i.e., V3 = f2·V1.

[0088] Among them, the initial data input module can calculate the cross-sectional area A1 of the mud pressing branch pipe. Since the flow rate meter and the solenoid valve jointly control the total mud pressing volume, the integral of the flow rate with respect to time multiplied by the inner cross-sectional area of the mud pressing pipe is the flow rate, enabling the control system to quickly calculate the total flow rate of the composite slurry. According to the theoretical mud pressing module, every time the pipe jacking machine 5 jacks a certain length S, an annular cavity with an inner diameter of the pipe joint diameter D, an outer diameter of D + Δ, and a length of S will be generated between the housing 1 and the soil. The actual mud pressing module can calculate the actual mud pressing volume V2 = f·V1 required to form a complete mud jacket currently, and then based on the real-time data of the flow rate module When the displayed flow rate per unit time reaches the requirement of the actual mud pressing volume, the mud pressing system is promptly closed to reduce the excessive delivery of the composite slurry by the mud pressing system and reduce the consumption and waste of the composite slurry.

[0089] Since the grouting is discontinuous and intermittent, the single - time theoretical grouting volume V1 is directly related to the distance S jacked by the pipe jacking machine each time.

[0090] The application of a tool joint for long - distance rock pipe jacking includes the described tool joint for long - distance rock pipe jacking, the pipe jacking machine 5, and the pipe jacking pipe joint 6; the rear end of the pipe jacking machine 5 is fixedly connected to the pipe jacking pipe joint 6, and the tool joint for long - distance rock pipe jacking is located in the middle of the pipe jacking pipe joint 6. Among them, the pipe jacking pipe joint 6 is composed of several pipe joints spliced together, and multiple tool joints for long - distance rock pipe jacking can be provided between the pipe jacking pipe joints 6. It should be noted that the number of tool joints needs to be determined according to the jacking length.

[0091] It should be noted that there is also a tool joint between the pipe jacking machine 5 and the pipe jacking pipe joint 6, and this tool joint is slightly different from the tool joint for long - distance rock pipe jacking in this solution. A relay oil cylinder is provided at the front end of this tool joint, and the relay oil cylinder can provide the jacking force for the continuous tunneling of the pipe jacking machine 5.

[0092] The composite slurry injected at the start of the tool joint with a relay cylinder consists of two parts, namely, the part within the tool joint range and the part within the pipe jacking machine range. During normal pipe jacking, the composite slurry within the tool joint range is basically stationary after injection. (Since there are several pipe segments between two tool joints, the composite slurry injected within the range between two tool joints is used for reducing the friction of the pipe segments, and there is no need to install grouting pipes and inject friction-reducing slurry on the pipe segments anymore.) A part of the composite slurry within the pipe jacking machine range will move forward with the pipe jacking machine due to the presence of the rock debris blocking component.

[0093] The tool joint with a relay cylinder moves forward as the pipe jacking machine 5 advances. The slurry jacket formed after mud injection is continuous and complete. Due to the time-dependent stability of the composite slurry, it is necessary to provide supplementary mud through the tool joint for long-distance rock pipe jacking proposed in this solution to achieve the best friction reduction effect.

[0094] Among them, as the pipe jacking machine 5 advances, the tool joint for long-distance rock pipe jacking can inject and supplement composite slurry into the gap between the pipe jacking pipe segment 6 and the soil body, so that a complete slurry jacket is formed outside the pipe jacking pipe segment 6, thereby achieving the effect of lubricating and reducing friction.

[0095] It should be noted that the tool joint for long-distance rock pipe jacking injects composite slurry once for each design stroke of the pipe jacking machine 5, and timely detects the grouting effect and makes up the slurry in time.

[0096] Specifically, the tool joint for long-distance rock pipe jacking controls the output volume of the composite slurry of the mud injection system 2 in both the first mud injection process and the subsequent mud injection processes through the following steps:

[0097] S1. Assume the diameter of the mud injection branch pipe 22 is d, and calculate the inner cross-sectional area of the mud injection branch pipe 22 as A1 = [π·(d / 2) 2 ;

[0098] S2. Collect the time t for the mud injection branch pipe 22 and the mud injection hole 23 to inject composite slurry into the soil body, and the flow rate v of the composite slurry, and calculate the flow rate of the composite slurry as where t = [t1,..., t2];

[0099] S3. Assume the length of the pipe jacking machine 5 advancing is S, the diameter of the housing 1 is D, and the distance between the housing 1 and the tunnel is Δ, then the cross-sectional area of the tunnel excavation is A2 = π·[(D + Δ) / 2] 2 , and the cross-sectional area of the housing 1 is A3 = π·(D / 2) 2 , and calculate the theoretical mud injection volume of the composite slurry as V1 = (A2 - A3)·S;

[0100] S4. Let the difference coefficient between the actual mud pressing volume V2 and the theoretical mud pressing volume V1 be f1, calculate the actual mud pressing volume of the composite mud as V2 = f·V1, and then control the output volume of the composite mud of the mud pressing system 2 according to the actual mud pressing volume V2 of the composite mud;

[0101] S5. Let the difference coefficient between the actual mud replenishing volume V3 and the theoretical mud pressing volume V1 be f2, calculate the actual mud replenishing volume of the composite mud as V3 = f1·V1, and then control the output volume of the composite mud of the mud pressing system according to the actual mud replenishing volume V3 of the composite mud.

[0102] During the tunneling process of the pipe jacking machine, the external mud pressing system conveys the composite mud to the tool joint, and the extrusion pump 24 injects the composite mud through the mud pressing branch pipe 22 and the mud pressing hole 23 to the outer periphery of the tool joint for long-distance rock pipe jacking. When pressing mud for the first time, first fill the gap outside the tool joint for long-distance rock pipe jacking, and then continue to fill the gap in front of the rock blocking member 4 and outside the shell of the pipe jacking machine. When pressing mud subsequently, keep the gap between the shell of the pipe jacking machine 5 and the pipe joint filled with the composite mud to form a complete thick mud sleeve.

[0103] The initial data input module can calculate the inner cross-sectional area A1 of the mud pressing branch pipe 22 = [π·(d / 2) 2 , and according to the flow rate module, the control system can quickly calculate the flow rate of the composite mud where t = [t1,...,t2] is the time interval. According to the theoretical mud pressing module and the actual mud pressing module, the actual mud pressing volume V2 = f·V1 required to form a complete mud sleeve currently can be calculated, and then according to the real-time data of the flow rate module promptly close the mud pressing system 2 to reduce the excessive delivery of the composite mud by the mud pressing system 2 and reduce the consumption and waste of the composite mud.

[0104] Specifically, the value range of the difference coefficient f1 is 2 - 2.5; the value range of the difference coefficient f2 is 1 - 1.3. The first grouting volume when the pipe jacking machine 5 starts should include the difference coefficient of mud pressing for the tool joint of the relay cylinder in the gap between the pipe jacking machine 5 and the soil, which is considered according to 2 - 2.5. In the later normal jacking stage, the theoretical mud pressing volume V1 is the volume of the tunnel excavation, and the actual mud replenishing volume V3 is taken as 1 - 1.35 times the theoretical mud pressing volume V1 to fill the gaps of the surrounding soil or rock mass.

[0105] The composite mud comprises the following raw materials in parts by mass: 100 parts of water, 45 parts of expansive soil, and 1 part of additive; the additive includes a thickening agent, a flocculant, and a stabilizer, and carboxymethyl cellulose sodium and soda ash can be used.

[0106] The composite slurry prepared by this ratio has the advantages of high concentration, low permeability, high stability, etc., so that a complete slurry jacket can be formed on the outer side of the housing 1 to achieve the effect of lubricating and reducing resistance, thus solving the problem that traditional slurry cannot effectively support the stability of the rock and soil mass. In addition, the composite slurry also has a certain plastic fluidity, so that after the composite slurry is discharged from the mud injection hole, it can quickly fill the gaps between the pipe jacking machine, the pipe segment and the tool segment and the surrounding soil and rock masses.

[0107] It should be noted that both sodium carboxymethylcellulose and soda ash can be dissolved in water, so that the composite slurry can have a certain flocculability and viscosity, reducing the situation of easy hydration segregation due to the low permeability of the composite slurry.

[0108] The other components and operations of a tool segment for long-distance rock pipe jacking according to an embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0109] In the description of this specification, the descriptions referring to the terms "embodiment", "example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0110] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. Application of a tool joint for long-distance rock pipe jacking, characterized in that, It includes a tool joint for long-distance rock pipe jacking, a pipe jacking machine, and a pipe jacking pipe joint; the rear end of the pipe jacking machine is connected to the pipe jacking pipe joint, and the tool joint for long-distance rock pipe jacking is located in the middle of the pipe jacking pipe joint; A tool joint for long-distance rock pipe jacking includes a housing, a mud pressing system, a detection component, a rock debris blocking member, a control system, a force transmission inductor, a relay oil cylinder, and a hydraulic station. The mud pressing system and the detection component are both installed in the housing, and the rock debris blocking member is installed outside the housing; The mud pressing system includes a mud pumping pump, an extrusion pump, a mud pressing main pipe, a mud pressing branch pipe, and a mud pressing hole; the output end of the mud pumping pump is connected to the mud pressing main pipe; the input end of the mud pressing main pipe is communicated with the grouting system at the starting end. An extrusion pump is provided between the mud pressing main pipe and the mud pressing branch pipe. The output end of the mud pressing main pipe is communicated with the input end of the mud pressing branch pipe, and the output end of the mud pressing branch pipe is communicated with the mud pressing hole; The rock debris blocking member is arranged opposite to the mud pressing hole, and the rock debris blocking member is used to prevent rock debris from depositing; the detection component is used to detect the pressure and flow rate of the mud pressing system, and the detection component is electrically connected to the control system; The control system includes an initial data input module, a flow rate module, a theoretical sludge pressing module, and an actual sludge pressing module; the initial data input module is used to set the diameter of the sludge pressing branch pipe to be , and to set the internal cross-sectional area of the sludge pressing branch pipe to be ; The flow module is used to calculate the flow rate of the composite mud ; The theoretical sludge pressing module is used to calculate the theoretical sludge pressing amount of the composite mud ; The actual mud pressing module is used to calculate the actual mud pressing amount of the composite mud ; The force transmission inductor is installed in the housing and is used to monitor the jacking force transmitted from the pipe joint behind the housing. The relay oil cylinder is located at the front end of the housing and is used to provide additional jacking force required for the pipe jacking machine or the pipe joint to jack forward. The hydraulic station is located in the middle of the housing and provides a power source for the jacking force.

2. The application of a tool joint for long-distance rock pipe jacking according to claim 1, characterized in that, The detection component includes a pressure gauge, a flow rate gauge, and a solenoid valve. The pressure gauge is located between the mud pressing branch pipe and the mud pressing hole, the flow rate gauge is located between the mud pressing branch pipe and the mud pressing hole, and the solenoid valve is located between the mud pressing branch pipe and the mud pressing hole.

3. The application of a tool joint for long-distance rock pipe jacking according to claim 1, characterized in that, The rock debris blocking member is arranged circumferentially around the tool joint and is in a circular ring shape. The cross-sectional shape of the rock debris blocking member is wedge-shaped.

4. The application of a tool joint for long-distance rock pipe jacking according to claim 1, characterized in that, A plurality of sealing plates are provided on the inner wall of the housing, and the plurality of sealing plates are respectively arranged at the input end of the mud pressing hole, and the sealing plates correspond to the mud pressing holes one by one.

5. The application of a tool joint for long-distance rock pipe jacking according to claim 1, characterized in that, In the initial data input module, the inner cross-sectional area of the sludge pressing branch pipe is ; The flow rate module specifically collects the time for injecting the composite slurry into the soil body through the sludge pressing branch pipe and the sludge pressing holes , and the flow velocity of the composite slurry , and calculates the flow rate of the composite slurry , where ; The theoretical mud pressing module specifically calculates the cross-sectional area of the soil cavity as by obtaining the jacking length of the pipe jacking machine , the diameter of the housing , and the distance between the housing and the soil body . The cross-sectional area of the housing is . Furthermore, the theoretical mud pressing volume of the composite mud is calculated as . The cross-sectional area of the housing is . ; The actual mud pressing module specifically calculates the actual mud pressing amount of the composite mud by setting the difference coefficient between the actual mud pressing amount and the theoretical mud pressing amount . ;​ The actual mud filling module specifically calculates the actual mud filling volume through the difference coefficient between the actual mud filling volume and the theoretical mud pressing volume .

6. A construction method for the application of the tool joint for long-distance rock pipe jacking according to any one of claims 1-5, characterized in that, It includes: During the first mud pressing process and subsequent mud pressing processes of the tool joint for long-distance rock pipe jacking, the output volume of the composite mud of the mud pressing system is controlled through the following steps: S1. Let the inner diameter of the sludge pressing branch pipe be , and calculate the inner cross-sectional area of the sludge pressing branch pipe as ; S2. Collect the time when the mud pressing branch pipe and the mud pressing holes inject the composite mud into the soil body as , and the flow rate of the composite mud is , calculate the flow rate of the composite mud as , where ; S3. Set the jacking length of the pipe jacking machine as , the outer diameter of the shell as , the spacing between the shell and the soil mass as , then the cross-sectional area of the soil cavity is , the cross-sectional area of the tool joint is , calculate the theoretical mud injection volume of the composite mud as ; S4. Set the actual mud pressing volume and the theoretical mud pressing volume The difference coefficient between them is , and calculate the actual mud pressing volume of the composite mud as , then according to the actual mud pressing volume of the composite mud, control the output volume of the composite mud of the mud pressing system; S5. Set the actual mud pressing volume and the theoretical mud pressing volume The difference coefficient between them is , and calculate the actual mud supplement volume of the composite mud as , and then control the output volume of the composite mud of the mud pressing system according to the actual mud supplement volume of the composite mud.

7. The construction method for the application of a tool joint for long-distance rock pipe jacking according to claim 6, characterized in that, The coefficient of variation has a value range of 2 - 2.5; the coefficient of variation has a value range of 1 - 1.

3.

8. The construction method for the application of a tool joint for long-distance rock pipe jacking according to claim 7, characterized in that, The composite mud includes raw materials in the following mass parts: 100 parts of water, 45 parts of swelling soil, and 1 part of additive; The additive includes sodium carboxymethyl cellulose and soda ash.

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