Measurement and control system for existing underground space additional construction project, pipe jacking construction and measurement and control method

Abstract

The measurement and control system comprises an information acquisition module, an information transmission module, a data storage module, a data processing module, an intelligent prediction module and a feedback control module, in addition, the existing underground space additional building project pipe jacking construction and measurement and control method comprises the steps of reinforcement of a pipe jacking construction area, hole digging of an existing underground space structure bottom plate, jacking and measurement and control of a pipe jacking machine head machine shell, downward jacking operation and measurement and control of downward jacking operation, dismantling of pipe jacking construction equipment and sealing treatment of pipe jacking connecting parts. A downward jacking pipe jacking construction method is adopted in an existing underground space, the characteristics that a top plate of the existing underground space structure serves as a counter-force support and a soft soil water-rich stratum is easy to excavate but difficult to support are fully utilized, and the risk of foundation pit excavation under the condition of a narrow site of the existing underground space in a soft soil water-rich area is avoided; safe tunneling operation under protection of the pipe jacking machine shell and the pipe joints is achieved, and an underground space is formed.

Description

Technical Field

[0001] The invention belongs to the technical field of construction control, and relates to a measurement and control system for an existing underground space expansion project, pipe jacking construction and a measurement and control method. Background Art

[0002] With the update of design standards related to water fire protection and drainage in civil buildings and the adjustment or upgrade of building functions, existing underground spaces such as underground transportation hubs, underground commercial buildings, underground garages, vehicle tunnels, and integrated pipeline corridors are facing the construction needs of adding deep pump rooms and corresponding construction methods and monitoring and control technologies.

[0003] Construction monitoring and control is an important measure to ensure project safety, improve construction quality and control environmental impact. It monitors the key parts of the project structure and the various safety status indicators of the surrounding environment in real time, and then takes corresponding control measures to ensure that the expected construction goals are completed efficiently and with high quality. However, the current construction of existing underground space expansion projects is facing the constraints of objective conditions such as the complexity and uncertainty of the formation conditions, the poor adaptability of existing monitoring equipment and information transmission technology to the underground engineering environment, the difficulty of integrating and analyzing monitoring data, the lack of standardized processes for construction monitoring and control of existing underground space expansion projects, and the low level of intelligent control of underground engineering construction. It is difficult to achieve automation, intelligence, informationization, efficiency and accuracy of construction monitoring and control, which seriously affects the grasp, evaluation, control and adjustment of structural safety, surrounding environment and construction technical parameters during the construction of existing underground space expansion projects, and thus affects the quality and efficiency of the construction of existing underground space expansion projects, and may even cause safety accidents and loss of life and property during the construction process.

[0004] In soft soil and water-rich areas with high stratum water content, high sensitivity, high compressibility and low bearing capacity, the current conventional construction method for adding deep pump houses in existing underground spaces adopts open excavation pit method combined with cast-in-place structure method, that is, the water-rich soft soil stratum is reinforced by freezing method or large volume of cement, and then the foundation pit of the narrow space is excavated and the structure is rebuilt section by section under the protection of temporary support. Conventional construction methods have problems such as high cost, long construction period, great impact on the surrounding environment, high labor intensity, low construction efficiency and many safety hazards, especially causing large deformation and additional internal force to the existing underground space structure, seriously affecting the safety and long-term operation of the existing underground space structure.

[0005] How to develop a safe, reliable, convenient, green and low-carbon construction method for adding deep pump rooms to existing underground spaces in soft soil and water-rich areas, and develop a matching, intelligent and efficient construction monitoring and control system and method to achieve automation, intelligence, informatization, efficiency and accuracy of construction monitoring and control, is a technical problem that needs to be urgently solved in the field of underground space renovation and expansion engineering construction in soft soil and water-rich areas. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention proposes a measurement and control system, jacking pipe construction and measurement and control method for the construction of an existing underground space extension project, which is suitable for the construction of a deep pump room in an existing underground space in soft soil and water-rich areas. By adding a monitoring and control system for a deep pump room by the downward rectangular jacking pipe method inside the existing underground space and the corresponding construction and measurement and control methods, the risks of foundation pit excavation under the narrow site conditions of the existing underground space, the defects of cast-in-place construction of the structure and the difficulties in controlling the construction of underground projects are avoided.

[0007] The first aspect of the present application discloses a measurement and control system for an existing underground space expansion project, including an information acquisition module, an information transmission module, a data storage module, a data processing module, an intelligent prediction module and a feedback control module; the information acquisition module includes a jacking information acquisition unit, an existing structure information acquisition unit, an equipment information acquisition unit and a stratum information acquisition unit;

[0008] The pipe jacking information acquisition unit includes but is not limited to a joint measuring sensor, which is used to obtain technical parameters of the pipe jacking structure during construction, wherein the pipe jacking structure is composed of a pipe jacking machine head casing and a plurality of pipe sections, the pipe jacking machine head casing is a ground-breaking device located at the front end of the pipe jacking structure, the front end of the pipe section is tightly connected to the rear end of the pipe jacking machine head casing, or two adjacent pipe sections are tightly connected head to tail, and the joint measuring sensor is arranged between adjacent pipe sections and is used to obtain three-dimensional relative displacement data between adjacent pipe sections;

[0009] The existing structure information acquisition unit is arranged on the existing underground space structure component, including but not limited to a structural stress sensor and a structural deformation sensor, wherein the existing underground space structure component includes an existing underground space structure bottom plate, an existing underground space structure top plate, an existing underground space structure vertical component and a plain concrete cushion layer, the existing underground space structure bottom plate and the existing underground space structure top plate are connected through the existing underground space structure vertical component, the plain concrete cushion layer is located below the existing underground space structure bottom plate, the structural stress sensor is used to obtain stress data of the existing underground space structure component, and the structural deformation sensor is used to obtain deformation data of the existing underground space structure component;

[0010] The equipment information acquisition unit includes but is not limited to a jacking force sensor, which is used to obtain technical parameters of the jacking equipment during construction, wherein the jacking equipment includes a jacking iron member, a hydraulic jack, a steel structure portal frame for jacking pipe reaction force and a jacking pipe reaction force base, the lower surface of the jacking iron member is in contact with the upper surface of the head casing of the jacking machine, the hydraulic jack is located above the jacking iron member and below the steel structure portal frame for jacking pipe reaction force, the steel structure portal frame for jacking pipe reaction force is connected to the top plate of the existing underground space structure through the jacking pipe reaction force base, and the jacking force sensor is arranged on the hydraulic jack and is used to obtain the jacking force data of the jack;

[0011] The formation information acquisition unit includes but is not limited to a formation pressure sensor and a formation strain sensor. The formation pressure sensor is buried in the formation around the pipe jacking construction area and is used to obtain formation pressure data. The formation strain sensor is buried in the formation around the pipe jacking construction area and is used to obtain formation strain data.

[0012] The information transmission module is used to establish remote data connection and transmission between each module and each unit;

[0013] The data processing module includes a data preprocessing unit and a data analysis unit; wherein the data preprocessing unit is used to preprocess the original data acquired by the information acquisition module, and the data analysis unit is used to calculate the data processed by the data preprocessing unit and obtain analysis results;

[0014] The intelligent prediction module is used to input the data processed by the data preprocessing unit into a pre-trained neural network model, and output the obtained construction control amount;

[0015] The data storage module is used to store the data processed by the data preprocessing unit, the analysis results output by the data processing module and the construction control quantity output by the intelligent prediction module;

[0016] The feedback control module includes an early warning unit and a control unit; wherein the early warning unit is used to determine whether to control the alarm installed on the steel structure portal frame for the jacking reaction force to trigger an alarm according to the analysis results of the data analysis unit; the control unit is used to control the jacking equipment and the head casing of the jacking machine according to the construction control quantity output by the intelligent prediction module.

[0017] Preferably, the construction control quantity includes but is not limited to the posture of the head casing of the pipe jacking machine, the jacking force and jacking speed of the hydraulic jack.

[0018] The second aspect of the present application discloses a pipe jacking construction and measurement and control method for an existing underground space expansion project, comprising the following steps:

[0019] S100, reinforcement of the pipe jacking construction area: measuring and locating the pipe jacking construction area, the tensile anchor drilling position and the grouting reinforcement drilling position of the existing underground space structure bottom plate; drilling downwards at the tensile anchor drilling position and inserting the tensile anchor, and then filling the gap between the tensile anchor and the hole wall with grouting material; drilling downwards at the grouting reinforcement drilling position, and performing double-liquid grouting on the underlying stratum of the existing underground space structure bottom plate to form a double-liquid grouting reinforcement area;

[0020] S200, excavating a hole in the existing underground space structure floor: after the tensile anchor rod and the double-liquid grouting reinforcement area are tested to meet the design strength requirements, the existing underground space structure floor and the plain concrete cushion layer in the top pipe construction area are excavated to form a hole, the excavation interface of the hole is made into a groove with a larger top and a smaller bottom, and a chloroprene rubber cord rubber sheet is installed on the excavation interface;

[0021] S300, jacking of the casing of the head of the pipe jacking machine and its measurement and control: the casing of the head of the pipe jacking machine is placed vertically downward in the pipe jacking construction area, and the jacking iron components, the hydraulic jack, the steel structure portal frame for the pipe jacking reaction force and the pipe jacking reaction force base required for the pipe jacking construction are installed in place; then a vertical downward jacking force is applied to the casing of the head of the pipe jacking machine through the hydraulic jack; at this time, the jacking reaction force, which is a force interacting with the jacking force, is transmitted upward to the top plate of the existing underground space structure through the steel structure portal frame for the pipe jacking reaction force and the pipe jacking reaction force base in turn; during the jacking of the casing of the head of the pipe jacking machine, the jacking force, the internal force and deformation of the existing underground space structure, and the stratum pressure and strain are monitored and controlled in real time through the measurement and control system of the existing underground space expansion project;

[0022] S400, downward jacking operation and its measurement and control: the head casing of the pipe jacking machine moves downward to a predetermined position under the action of the jacking force, and then the jacking is stopped, the jacking member and the hydraulic jack are lifted upward, and then the pipe section is placed on the head casing of the pipe jacking machine and under the jacking member, and the pipe section is tightly connected to the head casing of the pipe jacking machine; then the jacking member and the hydraulic jack are moved downward until the jacking member contacts the pipe section, and a vertical downward jacking force is applied to the pipe section by the hydraulic jack; the pipe section and the head casing of the pipe jacking machine are moved downward to a predetermined position under the action of the jacking force, and then the jacking is stopped, and the jacking member and The hydraulic jack is lifted upward, and then the second pipe section is placed on the pipe section and under the top iron component, and the second pipe section is tightly connected to the pipe section; then the top iron component and the hydraulic jack are moved downward until the top iron component contacts the second pipe section, and a vertical downward jacking force is applied to the second pipe section by the hydraulic jack; the above operation is repeated to achieve continuous downward jacking operation until the design depth required for the pump room construction is reached; during the downward jacking operation, the consistency of the pipe section axis, the jacking force, the internal force and deformation of the existing underground space structure, and the formation pressure and strain are monitored and controlled in real time by the existing underground space expansion project measurement and control system;

[0023] S500, dismantling of pipe jacking construction equipment: dismantling the jacking iron member, the hydraulic jack, the pipe reaction steel structure portal frame and the pipe jacking reaction base, and dismantling the core devices such as the motor placed inside the head casing of the pipe jacking machine, lifting them out and recycling them; the head casing of the pipe jacking machine is directly used as the permanent bottom sealing structure of the newly added pump room;

[0024] S600, sealing treatment of the top pipe connection part: grouting is performed to fill the gap between the pipe section and the hole, and then the curtain rubber plate is removed; after the construction of the deep pump room structure is completed, shrinkage compensating concrete is used to cast the connection part between the pipe section at the hole and the bottom plate of the existing underground space structure.

[0025] Preferably, in step S300, when the head casing of the pipe jacking machine moves downward under the action of the jacking force and penetrates the formation, the cord rubber sheet is squeezed and enters the gap between the head casing of the pipe jacking machine and the hole, which is helpful to prevent formation water from infiltrating into the existing underground space through the gap during construction.

[0026] Preferably, in step S400, for the measurement and control of the consistency of the pipe joint axis, considering that factors such as insufficient pipe joint connection quality and formation unevenness may cause the axis of adjacent pipe joints to be inconsistent, it is necessary to monitor and control the relative opening and closing degree, relative misalignment degree and relative rotation degree between adjacent pipe joints in real time during pipe joint connection and jacking; for this purpose, the three-way relative displacement between adjacent pipe joints is obtained by the joint measuring sensor, including the axial relative displacement ΔD1, the radial relative displacement ΔD2 and the tangential relative displacement ΔD3, and the following expression is satisfied:

[0027]

[0028] Wherein, [ΔD1] is the axial relative displacement limit, [ΔD2] is the radial relative displacement limit, and [ΔD3] is the tangential relative displacement limit;

[0029] During the pipe segment connection, when the data processing module determines after analysis that the axial relative displacement ΔD1, radial relative displacement ΔD2 or tangential relative displacement ΔD3 between adjacent pipe segments exceeds the limit, the feedback control module transmits the instruction to the alarm and triggers the alarm until the pipe segment connection position and posture are adjusted to meet the requirements;

[0030] During the pipe segment jacking, when the data processing module determines after analysis that the axial relative displacement ΔD1, radial relative displacement ΔD2 or tangential relative displacement ΔD3 between adjacent pipe segments exceeds the limit, the feedback control module transmits the instruction to the alarm and triggers the alarm, and immediately stops the jacking construction and takes corrective measures.

[0031] Preferably, in step S300 and step S400, for the measurement and control of the jacking force, considering that the jacking force applied by the hydraulic jack on the head casing of the pipe jacking machine or the pipe segment has a significant impact on the internal force of the pipe segment structure, the stress deformation of the stratum, and the internal force and deformation of the existing underground space structure, it is necessary to obtain the jacking force F of the hydraulic jack through the jacking force sensor. a , jacking force F a Satisfies the following expression:

[0032] F a =ΣF ai ≤[F a ]

[0033] Among them, F ai is the top force of the nth jack, [F a ] is the limit of jacking force;

[0034] When the data processing module determines the jacking force F after analysis aWhen the limit value is exceeded, the feedback control module transmits the instruction to the alarm and triggers the alarm until the construction technical parameters of the hydraulic jack are adjusted to meet the requirements.

[0035] Preferably, in step S300 and step S400, for the measurement and control of the internal force and deformation of the existing underground space structure, the jacking force F a The mutually interacting jacking reaction force is transmitted to the existing underground space structural components in turn through the jacking reaction steel structure portal frame and the jacking reaction base, which has a significant impact on its structural internal force and deformation. Therefore, it is necessary to monitor the internal force and deformation of the existing underground space structural components respectively through the structural stress sensor and the structural deformation sensor; when the data processing module determines that the internal force and deformation of the existing underground space structural components exceed the limit value after analysis, the feedback control module transmits the instruction to the alarm and triggers the alarm, and immediately stops the jacking construction and takes corrective measures.

[0036] Preferably, in step S300 and step S400, for the measurement and control of formation pressure and strain, the formation pressure and strain around the pipe jacking construction area are monitored by the formation pressure sensor and the formation strain sensor, so as to grasp the surrounding formation conditions during the construction in real time.

[0037] Preferably, in step S300 and step S400, the data processed by the data preprocessing unit is input into the intelligent prediction module and the current construction control quantity is predicted, and then the jacking equipment and the head casing of the pipe jacking machine are controlled by the feedback control module.

[0038] Preferably, in step S300 and step S400, a counterweight is temporarily added above the top plate of the existing underground space structure to reduce the adverse effect of the jacking reaction force on the internal force and deformation of the top plate of the existing underground space structure; the weight of the counterweight G w Satisfies the following expression:

[0039] G w =F a -G b

[0040] In the formula, F a is the jacking force, G b is the weight of the top plate of the existing underground space structure.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows: in order to solve the construction problem of deep pump room project in existing underground space in soft soil and water-rich areas, the first aspect discloses a measurement and control system for the existing underground space construction project, including an information acquisition module, an information transmission module, a data storage module, a data processing module, an intelligent prediction module and a feedback control module; the second aspect discloses a jacking construction and measurement and control method for the existing underground space construction project, including reinforcement of the jacking construction area, excavation of the hole in the bottom plate of the existing underground space structure, jacking of the head casing of the jacking machine and its measurement and control, downward jacking operation and its measurement and control, removal of the jacking construction equipment and sealing treatment of the jacking connection parts; by creatively developing a downward jacking construction method, the top plate of the existing underground space structure is fully utilized as a reaction support and the soft soil and water-rich stratum is easy to excavate but difficult to The characteristics of the support; by adopting the jacking construction method of downward jacking inside the existing underground space, the risk of foundation pit excavation under the narrow site conditions of the existing underground space in soft soil and water-rich areas is avoided, and safe excavation operations are achieved under the protection of the jacking machine casing and pipe sections to form underground space; by adopting prefabricated and assembled pipe sections and mechanized operations, the defects of cast-in-place construction of underground engineering structures are avoided, and the safety, efficiency and environmental protection of underground engineering construction are significantly improved; by monitoring the technical parameters of the jacking structure, the existing underground space structure, the jacking equipment and the surrounding strata, the various safety status indicators of the key parts of the engineering structure and the surrounding environment are controlled in real time; by using a neural network model to predict the current construction control quantity based on the measured technical parameters, the automation, intelligence, informatization, efficiency and accuracy of construction monitoring and control are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a connection diagram of the measurement and control system of the existing underground space expansion project of the present invention;

[0043] Figure 2 It is a flow chart of the pipe jacking construction and measurement and control method of the existing underground space expansion project of the present invention;

[0044] Figure 3 It is a schematic diagram of an existing underground space structure before construction according to an embodiment of the present invention;

[0045] Figure 4 It is a structural schematic diagram of construction step S100 according to an embodiment of the present invention;

[0046] Figure 5 It is a structural schematic diagram of the construction step S200 according to an embodiment of the present invention;

[0047] Figure 6 It is a structural schematic diagram of the construction step S300 according to an embodiment of the present invention;

[0048] Figure 7It is a structural schematic diagram of the construction step S400 according to an embodiment of the present invention;

[0049] Figure 8 It is a structural schematic diagram of construction step S500 according to an embodiment of the present invention;

[0050] Fig. 9 It is a structural schematic diagram of the construction step S600 according to an embodiment of the present invention;

[0051] Fig.10 This is a schematic diagram of the structure of the chiseling interface in the construction step S300 according to an embodiment of the present invention;

[0052] Figure numerals: 1-information acquisition module, 11-pipe jacking information acquisition unit, 111-seam measurement sensor, 12-existing structure information acquisition unit, 121-structural stress sensor, 122-structural deformation sensor, 13-equipment information acquisition unit, 131-jacking force sensor, 14-formation information acquisition unit, 141-formation pressure sensor, 142-formation strain sensor, 2-information transmission module, 3-data storage module, 4-data processing module, 41-data preprocessing unit, 42-data analysis unit, 5-intelligent prediction module, 6-feedback control module , 61-early warning unit, 62-control unit, 7-existing underground space structure components, 71-existing underground space structure bottom plate, 72-existing underground space structure top plate, 73-existing underground space structure vertical components, 74-plain concrete cushion, 75-double liquid grouting reinforcement area, 76-tensile anchor rod, 77-cord rubber sheet, 771-fixing pins, 78-chisel interface, 81-top iron component, 82-hydraulic jack, 83-steel structure portal frame for jacking pipe reaction, 84-jacking pipe reaction base, 91-jacking machine head casing, 92-pipe section, 93-compensating shrinkage concrete. DETAILED DESCRIPTION

[0053] The following is combined with Figure 1-10 The embodiments of the present invention are described in more detail with reference to the accompanying drawings so that a person skilled in the art can implement the present invention after reading the present description. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] The first aspect of the present application discloses Figure 1 The existing underground space expansion project measurement and control system shown in the figure includes an information acquisition module 1, an information transmission module 2, a data storage module 3, a data processing module 4, an intelligent prediction module 5 and a feedback control module 6; the information acquisition module 1 includes a jacking information acquisition unit 11, an existing structure information acquisition unit 12, an equipment information acquisition unit 13 and a stratum information acquisition unit 14;

[0055] The pipe jacking information acquisition unit 11 includes but is not limited to a joint measuring sensor 111, which is used to obtain technical parameters of the pipe jacking structure during construction, wherein the pipe jacking structure is composed of a pipe jacking machine head casing 91 and a plurality of pipe sections 92, the pipe jacking machine head casing 91 is a ground-breaking device located at the front end of the pipe jacking structure, the front end of the pipe section 92 is tightly connected to the rear end of the pipe jacking machine head casing 91, or two adjacent pipe sections 92 are tightly connected end to end, and the joint measuring sensor 111 is arranged between adjacent pipe sections 92 and is used to obtain three-way relative displacement data between adjacent pipe sections 92;

[0056] The existing structure information acquisition unit 12 is arranged on the existing underground space structure component 7, and includes but is not limited to a structure stress sensor 121 and a structure deformation sensor 122, wherein the existing underground space structure component 7 includes an existing underground space structure bottom plate 71, an existing underground space structure top plate 72, an existing underground space structure vertical component 73 and a plain concrete cushion layer 74, the existing underground space structure bottom plate 71 and the existing underground space structure top plate 72 are connected through the existing underground space structure vertical component 73, and the plain concrete cushion layer 74 is located below the existing underground space structure bottom plate 71, the structure stress sensor 121 is used to obtain stress data of the existing underground space structure component 7, and the structure deformation sensor 122 is used to obtain deformation data of the existing underground space structure component 7;

[0057] The equipment information acquisition unit includes but is not limited to a jacking force sensor 131, which is used to obtain technical parameters of the jacking equipment during construction, wherein the jacking equipment includes a jacking iron member 81, a hydraulic jack 82, a steel structure portal frame 83 for jacking pipe reaction force, and a jacking pipe reaction force base 84, the lower surface of the jacking iron member 81 is in contact with the upper surface of the jacking machine head casing 91, the hydraulic jack 82 is located above the jacking iron member 81 and below the steel structure portal frame 83 for jacking pipe reaction force, the steel structure portal frame 83 for jacking pipe reaction force is connected to the existing underground space structure top plate 72 through the jacking pipe reaction force base 84, and the jacking force sensor 131 is arranged on the hydraulic jack 82 and is used to obtain the jacking force data of the jack;

[0058] The formation information acquisition unit 14 includes but is not limited to a formation pressure sensor 141 and a formation strain sensor 142. The formation pressure sensor 141 is buried in the formation around the pipe jacking construction area and is used to obtain formation pressure data. The formation strain sensor 142 is buried in the formation around the pipe jacking construction area and is used to obtain formation strain data.

[0059] The information transmission module 2 is used to establish remote data connection and transmission between modules and units;

[0060] The data processing module 4 includes a data preprocessing unit 41 and a data analysis unit 42; wherein the data preprocessing unit 41 is used to preprocess the original data acquired by the information acquisition module 1, and the data analysis unit 42 is used to calculate the data processed by the data preprocessing unit 41 and obtain the analysis result;

[0061] The intelligent prediction module 5 is used to input the data processed by the data preprocessing unit 41 into a pre-trained neural network model, and output the obtained construction control amount;

[0062] The data storage module 3 is used to store the data processed by the data preprocessing unit 41, the analysis results output by the data processing module 4 and the construction control quantity output by the intelligent prediction module 5;

[0063] The feedback control module 6 includes an early warning unit 61 and a control unit 62; wherein the early warning unit 61 is used to determine whether to control the alarm installed on the steel structure portal frame 83 for the jacking reaction force to trigger an alarm according to the analysis result of the data analysis unit 42; the control unit 62 is used to control the jacking equipment and the jacking machine head casing 91 according to the construction control quantity output by the intelligent prediction module 5.

[0064] In a specific implementation, the construction control quantity includes but is not limited to the posture of the head casing 91 of the pipe jacking machine, the jacking force and jacking speed of the hydraulic jack 82 .

[0065] In a specific implementation, the pipe segment 92 is transported to the pipe jacking construction area for construction after being prefabricated in the factory; the factory prefabrication process includes but is not limited to the assembly of a fixed steel mold, mechanical vibration pouring and high-temperature steam curing.

[0066] The second aspect of the present application discloses Figures 2 to 10 The pipe jacking construction and measurement and control method for the existing underground space expansion project shown includes the following steps:

[0067] S100, reinforcement of the pipe jacking construction area: measure and locate the pipe jacking construction area, the tensile anchor drilling position and the grouting reinforcement drilling position of the existing underground space structure bottom plate 71; drill downward at the tensile anchor drilling position and insert the tensile anchor 76, then fill the gap between the tensile anchor and the hole wall with grouting material; drill downward at the grouting reinforcement drilling position, and perform double-liquid grouting on the underlying stratum of the existing underground space structure bottom plate 71 to form a double-liquid grouting reinforcement area 75;

[0068] S200, excavating a hole in the existing underground space structure floor: after the tensile anchor rod 76 and the double-liquid grouting reinforcement area 75 are tested to meet the design strength requirements, the existing underground space structure floor 71 and the plain concrete cushion layer 74 in the jacking pipe construction area are excavated to form a hole, and the excavation interface 78 of the hole is made into a groove with a larger upper part and a smaller lower part, and a chloroprene rubber cord rubber plate 77 is installed on the excavation interface 78;

[0069] S300, jacking of the head casing of the pipe jacking machine and its measurement and control: the head casing 91 of the pipe jacking machine is placed vertically downward in the pipe jacking construction area, and the jacking iron member 81, the hydraulic jack 82, the steel structure portal frame 83 for the pipe jacking reaction force and the pipe jacking reaction force base 84 required for the pipe jacking construction are installed in place; then the hydraulic jack 82 applies a vertical downward jacking force to the head casing 91 of the pipe jacking machine; at this time, the jacking reaction force that interacts with the jacking force is sequentially transmitted through the steel structure portal frame 83 for the pipe jacking reaction force and the pipe jacking reaction force base 84. The force base is transmitted upward to the top plate 72 of the existing underground space structure; in specific implementation, when the head casing 91 of the jacking machine moves downward under the jacking force and penetrates into the stratum, the cord rubber plate 77 is squeezed and enters the gap between the head casing 91 of the jacking machine and the hole, which is helpful to prevent the formation water from infiltrating into the existing underground space from the gap during construction; during the jacking of the head casing of the jacking machine, the jacking force, the internal force and deformation of the existing underground space structure, and the formation pressure and strain are monitored and controlled in real time through the existing underground space expansion project measurement and control system;

[0070] S400, downward jacking operation and its measurement and control: the head casing 91 of the pipe jacking machine moves downward to a predetermined position under the action of the jacking force and then stops jacking, the jacking iron member 81 and the hydraulic jack 82 are lifted upward, and then the pipe section 92 is placed on the head casing 91 of the pipe jacking machine and under the jacking iron member 81, and the pipe section 92 is tightly connected to the head casing 91 of the pipe jacking machine; then the jacking iron member 81 and the hydraulic jack 82 are moved downward until the jacking iron member 81 contacts the pipe section 92, and a vertical downward jacking force is applied to the pipe section 92 by the hydraulic jack 82; the pipe section 92 and the head casing 91 of the pipe jacking machine are moved downward to a predetermined position under the action of the jacking force and then stops jacking, and the jacking iron member 81 and the hydraulic jack 82 are lifted upward, and then the pipe section 92 is placed on the head casing 91 of the pipe jacking machine and under the jacking iron member 81, and the pipe section 92 is tightly connected to the head casing 91 of the pipe jacking machine; then the jacking iron member 81 and the hydraulic jack 82 are moved downward until the jacking iron member 81 contacts the pipe section 92, and a vertical downward jacking force is applied to the pipe section 92 by the hydraulic jack 82; the pipe section 92 and the head casing 91 of the pipe jacking machine are moved downward to a predetermined position under the action of the jacking force and then stops jacking, The component 81 and the hydraulic jack 82 are lifted upward, and then the second pipe segment 92 is placed on the pipe segment 92 and under the top iron component 81, and the second pipe segment 92 is tightly connected to the pipe segment 92; then the top iron component 81 and the hydraulic jack 82 are moved downward until the top iron component 81 contacts the second pipe segment 92, and a vertical downward jacking force is applied to the second pipe segment 92 through the hydraulic jack 82; the above operation is repeated to achieve continuous downward jacking operation until the design depth required for the pump room construction is reached; during the downward jacking operation, the consistency of the pipe segment axis, the jacking force, the internal force and deformation of the existing underground space structure, and the formation pressure and strain are monitored and controlled in real time through the existing underground space expansion project measurement and control system;

[0071] S500, dismantling of pipe jacking construction equipment: dismantling the jacking iron member 81, the hydraulic jack 82, the pipe reaction steel structure portal frame 83 and the pipe jacking reaction base 84, and dismantling the core devices such as the motor placed inside the head casing 91 of the pipe jacking machine, lifting them out and recycling them; the head casing 91 of the pipe jacking machine is directly used as the permanent bottom cover structure of the newly added pump room;

[0072] S600, sealing treatment of the top pipe connection part: grouting is performed to fill the gap between the pipe section 92 and the hole, and then the curtain rubber plate 77 is removed; after the construction of the deep pump room structure is completed, shrinkage compensating concrete 93 is used to cast the connection part between the pipe section 92 at the hole and the existing underground space structure bottom plate 71.

[0073] During the specific implementation, the waste soil generated during the construction process is transported to the non-construction area through a screw machine and a conveyor belt.

[0074] In the specific implementation, in step S400, for the measurement and control of the consistency of the pipe joint axis, considering that factors such as insufficient pipe joint connection quality and formation unevenness may cause the axis between adjacent pipe joints to be inconsistent, it is necessary to monitor the relative opening and closing degree, relative misalignment degree and relative rotation degree between adjacent pipe joints in real time during pipe joint connection and jacking; for this purpose, the three-way relative displacement between adjacent pipe joints is obtained by the joint measuring sensor 111, including the axial relative displacement ΔD1, the radial relative displacement ΔD2 and the tangential relative displacement ΔD3, and the following expression is satisfied:

[0075]

[0076] Wherein, [ΔD1] is the axial relative displacement limit, [ΔD2] is the radial relative displacement limit, and [ΔD3] is the tangential relative displacement limit;

[0077] During the pipe segment connection, when the data processing module 4 determines after analysis that the axial relative displacement ΔD1, radial relative displacement ΔD2 or tangential relative displacement ΔD3 between adjacent pipe segments 92 exceeds the limit value, the feedback control module 6 transmits the instruction to the alarm and triggers the alarm until the pipe segment connection position and posture are adjusted to meet the requirements;

[0078] During the pipe segment jacking, when the data processing module 4 determines after analysis that the axial relative displacement ΔD1, radial relative displacement ΔD2 or tangential relative displacement ΔD3 between adjacent pipe segments exceeds the limit value, the feedback control module 6 transmits the instruction to the alarm and triggers the alarm, and immediately stops the jacking construction and takes corrective measures;

[0079] In a specific implementation, the axial relative displacement limit [ΔD1] is 2.0 mm, the radial relative displacement limit [ΔD2] is 20 mm, and the tangential relative displacement limit [ΔD3] is 15 mm. When constructing a typical pipe segment 92, the axial relative displacement ΔD1 measured under the most unfavorable conditions is 1.1 mm, the radial relative displacement ΔD2 is 5.4 mm, and the tangential relative displacement ΔD3 is 1.9 mm, which meets the requirements of formula (1) and does not trigger an alarm.

[0080] In the specific implementation, in step S300 and step S400, for the measurement and control of the jacking force, considering that the jacking force applied by the hydraulic jack 82 on the head casing 91 of the jacking machine or the pipe segment 92 has a significant impact on the internal force of the pipe segment structure, the stress deformation of the stratum, and the internal force and deformation of the existing underground space structure, it is necessary to obtain the jacking force F of the hydraulic jack 82 through the jacking force sensor 131. a , jacking force F a Satisfies the following expression:

[0081] Fa =ΣF ai ≤[F a ] (2)

[0082] Among them, F ai is the top force of the nth jack, [F a ] is the limit of jacking force;

[0083] When the data processing module 4 determines the jacking force F after analysis a When the limit is exceeded, the feedback control module 6 transmits the instruction to the alarm and triggers the alarm until the construction technical parameters of the hydraulic jack 82 are adjusted to meet the requirements;

[0084] Under typical working conditions in specific implementation, the jacking force F a is 1200kN, the jacking force limit [F a ] is 2000kN, which meets the requirements of formula (2).

[0085] In the specific implementation, in step S300 and step S400, for the measurement and control of the internal force and deformation of the existing underground space structure, considering the jacking force F a The mutually interacting jacking reaction force is transmitted to the existing underground space structural member 7 in turn through the jacking reaction steel structure portal frame 83 and the jacking reaction base 84, which has a significant impact on its structural internal force and deformation. Therefore, it is necessary to monitor the internal force and deformation of the existing underground space structural member 7 respectively through the structural stress sensor 121 and the structural deformation sensor 122; when the data processing module 4 determines that the internal force and deformation of the existing underground space structural member 7 exceed the limit value after analysis, the feedback control module 6 transmits the instruction to the alarm and triggers the alarm, and immediately stops the jacking construction and takes corrective measures.

[0086] In a specific implementation, a counterweight is temporarily added above the top plate of the existing underground space structure to reduce the adverse effect of the jacking reaction force on the internal force and deformation of the top plate of the existing underground space structure; the weight of the counterweight is G w Satisfies the following expression:

[0087] G w =F a -G b (3)

[0088] In the formula, F a is the jacking force, G b is the weight of the top plate of the existing underground space structure;

[0089] Under typical working conditions, the jacking force F a is 1200kN, the weight of the top plate of the existing underground space structure Gb is 50 kN, and the weight G of the counterweight is calculated according to formula (3): w It is 1150kN.

[0090] In the specific implementation, in step S300 and step S400, the formation pressure and strain are monitored by monitoring the formation pressure and strain around the pipe jacking construction area through the formation pressure sensor 141 and the formation strain sensor 142, so as to grasp the surrounding formation conditions during the construction in real time.

[0091] In the specific implementation, in step S300 and step S400, for real-time control of construction, the data processed by the data preprocessing unit 41 is input into the intelligent prediction module 5 and the current construction control quantity is predicted, and then the jacking equipment and the jacking machine head casing 91 are controlled through the feedback control module 6.

[0092] It can be seen that by creatively developing a downward jacking construction method, the top plate of the existing underground space structure is fully utilized as a reaction support and the characteristics of soft soil and water-rich strata that are easy to excavate but difficult to support; by adopting a downward jacking construction method inside the existing underground space, the risk of foundation pit excavation under the narrow site conditions of the existing underground space in soft soil and water-rich areas is avoided, and safe excavation operations are achieved under the protection of the jacking machine casing and pipe sections to form an underground space; by adopting prefabricated and assembled pipe sections and mechanized operations, the defects of cast-in-place construction of underground engineering structures are avoided, and the safety, efficiency and environmental protection of underground engineering construction are significantly improved; by monitoring the technical parameters of the jacking structure, the existing underground space structure, the jacking equipment and the surrounding strata, the various safety status indicators of the key parts of the engineering structure and the surrounding environment are controlled in real time; by adopting a neural network model to predict the current construction control quantity based on the measured technical parameters, the automation, intelligence, informatization, efficiency and accuracy of construction monitoring and control are achieved.

[0093] The above are one or more embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. The existing underground space expansion project measurement and control system is characterized by: It includes an information acquisition module, an information transmission module, a data storage module, a data processing module, an intelligent prediction module and a feedback control module; the information acquisition module includes a pipe jacking information acquisition unit, an existing structure information acquisition unit, an equipment information acquisition unit and a formation information acquisition unit; The pipe jacking information acquisition unit includes but is not limited to a joint measuring sensor, which is used to obtain technical parameters of the pipe jacking structure during construction, wherein the pipe jacking structure is composed of a pipe jacking machine head casing and a plurality of pipe sections, the pipe jacking machine head casing is a ground-breaking device located at the front end of the pipe jacking structure, the front end of the pipe section is tightly connected to the rear end of the pipe jacking machine head casing, or two adjacent pipe sections are tightly connected head to tail, and the joint measuring sensor is arranged between adjacent pipe sections and is used to obtain three-dimensional relative displacement data between adjacent pipe sections; The existing structure information acquisition unit is arranged on the existing underground space structure component, including but not limited to a structural stress sensor and a structural deformation sensor, wherein the existing underground space structure component includes an existing underground space structure bottom plate, an existing underground space structure top plate, an existing underground space structure vertical component and a plain concrete cushion layer, the existing underground space structure bottom plate and the existing underground space structure top plate are connected through the existing underground space structure vertical component, the plain concrete cushion layer is located below the existing underground space structure bottom plate, the structural stress sensor is used to obtain stress data of the existing underground space structure component, and the structural deformation sensor is used to obtain deformation data of the existing underground space structure component; The equipment information acquisition unit includes but is not limited to a jacking force sensor, which is used to obtain technical parameters of the jacking equipment during construction, wherein the jacking equipment includes a jacking iron member, a hydraulic jack, a steel structure portal frame for jacking pipe reaction force and a jacking pipe reaction force base, the lower surface of the jacking iron member is in contact with the upper surface of the head casing of the jacking machine, the hydraulic jack is located above the jacking iron member and below the steel structure portal frame for jacking pipe reaction force, the steel structure portal frame for jacking pipe reaction force is connected to the top plate of the existing underground space structure through the jacking pipe reaction force base, and the jacking force sensor is arranged on the hydraulic jack and is used to obtain the jacking force data of the jack; The formation information acquisition unit includes but is not limited to a formation pressure sensor and a formation strain sensor. The formation pressure sensor is buried in the formation around the pipe jacking construction area and is used to obtain formation pressure data. The formation strain sensor is buried in the formation around the pipe jacking construction area and is used to obtain formation strain data. The information transmission module is used to establish remote data connection and transmission between each module and each unit; The data processing module includes a data preprocessing unit and a data analysis unit; wherein the data preprocessing unit is used to preprocess the original data acquired by the information acquisition module, and the data analysis unit is used to calculate the data processed by the data preprocessing unit and obtain analysis results; The intelligent prediction module is used to input the data processed by the data preprocessing unit into a pre-trained neural network model, and output the obtained construction control amount; The data storage module is used to store the data processed by the data preprocessing unit, the analysis results output by the data processing module and the construction control quantity output by the intelligent prediction module; The feedback control module includes an early warning unit and a control unit; wherein the early warning unit is used to determine whether to control the alarm installed on the steel structure portal frame for the jacking reaction force to trigger an alarm according to the analysis results of the data analysis unit; the control unit is used to control the jacking equipment and the head casing of the jacking machine according to the construction control quantity output by the intelligent prediction module.

2. The existing underground space expansion project measurement and control system according to claim 1 is characterized in that: The construction control quantities include but are not limited to the posture of the head casing of the pipe jacking machine, the jacking force and jacking speed of the hydraulic jack.

3. A pipe jacking construction and measurement and control method for an existing underground space expansion project, characterized in that: The existing underground space expansion project measurement and control system described in any one of claims 1-2 is used to monitor and control the jacking construction work, including the following steps: S100, reinforcement of the pipe jacking construction area: measuring and locating the pipe jacking construction area, the tensile anchor drilling position and the grouting reinforcement drilling position of the existing underground space structure bottom plate; drilling downwards at the tensile anchor drilling position and inserting the tensile anchor, and then filling the gap between the tensile anchor and the hole wall with grouting material; drilling downwards at the grouting reinforcement drilling position, and performing double-liquid grouting on the underlying stratum of the existing underground space structure bottom plate to form a double-liquid grouting reinforcement area; S200, excavating a hole in the existing underground space structure floor: after the tensile anchor rod and the double-liquid grouting reinforcement area are tested to meet the design strength requirements, the existing underground space structure floor and the plain concrete cushion layer in the top pipe construction area are excavated to form a hole, the excavation interface of the hole is made into a groove with a larger top and a smaller bottom, and a chloroprene rubber cord rubber sheet is installed on the excavation interface; S300, jacking of the casing of the head of the pipe jacking machine and its measurement and control: the casing of the head of the pipe jacking machine is placed vertically downward in the pipe jacking construction area, and the jacking iron components, the hydraulic jack, the steel structure portal frame for the pipe jacking reaction force and the pipe jacking reaction force base required for the pipe jacking construction are installed in place; then a vertical downward jacking force is applied to the casing of the head of the pipe jacking machine through the hydraulic jack; at this time, the jacking reaction force, which is a force interacting with the jacking force, is transmitted upward to the top plate of the existing underground space structure through the steel structure portal frame for the pipe jacking reaction force and the pipe jacking reaction force base in turn; during the jacking of the casing of the head of the pipe jacking machine, the jacking force, the internal force and deformation of the existing underground space structure, and the stratum pressure and strain are monitored and controlled in real time through the measurement and control system of the existing underground space expansion project; S400, downward jacking operation and its measurement and control: the head casing of the pipe jacking machine moves downward to a predetermined position under the action of the jacking force, and then the jacking is stopped, the jacking member and the hydraulic jack are lifted upward, and then the pipe section is placed on the head casing of the pipe jacking machine and under the jacking member, and the pipe section is tightly connected to the head casing of the pipe jacking machine; then the jacking member and the hydraulic jack are moved downward until the jacking member contacts the pipe section, and a vertical downward jacking force is applied to the pipe section by the hydraulic jack; the pipe section and the head casing of the pipe jacking machine are moved downward to a predetermined position under the action of the jacking force, and then the jacking is stopped, and the jacking member and The hydraulic jack is lifted upward, and then the second pipe section is placed on the pipe section and under the top iron component, and the second pipe section is tightly connected to the pipe section; then the top iron component and the hydraulic jack are moved downward until the top iron component contacts the second pipe section, and a vertical downward jacking force is applied to the second pipe section by the hydraulic jack; the above operation is repeated to achieve continuous downward jacking operation until the design depth required for the pump room construction is reached; during the downward jacking operation, the consistency of the pipe section axis, the jacking force, the internal force and deformation of the existing underground space structure, and the formation pressure and strain are monitored and controlled in real time by the existing underground space expansion project measurement and control system; S500, dismantling of pipe jacking construction equipment: dismantling the jacking iron member, the hydraulic jack, the pipe reaction steel structure portal frame and the pipe jacking reaction base, and dismantling the core devices such as the motor placed inside the head casing of the pipe jacking machine, lifting them out and recycling them; the head casing of the pipe jacking machine is directly used as the permanent bottom sealing structure of the newly added pump room; S600, sealing treatment of the top pipe connection part: grouting is performed to fill the gap between the pipe section and the hole, and then the curtain rubber plate is removed; after the construction of the deep pump room structure is completed, shrinkage compensating concrete is used to cast the connection part between the pipe section at the hole and the bottom plate of the existing underground space structure.

4. The pipe jacking construction and measurement and control method for the existing underground space expansion project according to claim 3 is characterized in that: In step S300, when the head casing of the pipe jacking machine moves downward under the action of the jacking force and penetrates the formation, the cord rubber sheet is squeezed and enters the gap between the head casing of the pipe jacking machine and the hole, which is helpful to prevent the formation water from infiltrating into the existing underground space through the gap during construction.

5. The pipe jacking construction and measurement and control method for the existing underground space expansion project according to claim 3 is characterized in that: In step S400, for the measurement and control of the consistency of the pipe segment axis, the three-way relative displacement between adjacent pipe segments is obtained by the joint measuring sensor, including the axial relative displacement ΔD1, the radial relative displacement ΔD2 and the tangential relative displacement ΔD3, and the following expression is satisfied: Wherein, [ΔD1] is the axial relative displacement limit, [ΔD2] is the radial relative displacement limit, and [ΔD3] is the tangential relative displacement limit; During the pipe segment connection, when the data processing module determines after analysis that the axial relative displacement ΔD1, radial relative displacement ΔD2 or tangential relative displacement ΔD3 between adjacent pipe segments exceeds the limit, the feedback control module transmits the instruction to the alarm and triggers the alarm until the pipe segment connection position and posture are adjusted to meet the requirements; During the pipe segment jacking, when the data processing module determines after analysis that the axial relative displacement ΔD1, radial relative displacement ΔD2 or tangential relative displacement ΔD3 between adjacent pipe segments exceeds the limit, the feedback control module transmits the instruction to the alarm and triggers the alarm, and immediately stops the jacking construction and takes corrective measures.

6. The pipe jacking construction and measurement and control method for the existing underground space expansion project according to claim 3 is characterized in that: In step S300 and step S400, for the measurement and control of the jacking force, the jacking force F of the hydraulic jack is obtained by the jacking force sensor. a , jacking force F a Satisfies the following expression: F a =ΣF ai ≤[F a ] Among them, F ai is the top force of the nth jack, [F a ] is the limit of jacking force; When the data processing module determines the jacking force F after analysis a When the limit value is exceeded, the feedback control module transmits the instruction to the alarm and triggers the alarm until the construction technical parameters of the hydraulic jack are adjusted to meet the requirements.

7. The pipe jacking construction and measurement and control method for the existing underground space expansion project according to claim 3 is characterized in that: In step S300 and step S400, for the measurement and control of the internal force and deformation of the existing underground space structure, the internal force and deformation of the existing underground space structure components are monitored respectively by the structural stress sensor and the structural deformation sensor; When the data processing module determines after analysis that the internal force and deformation of the existing underground space structural components exceed the limit value, the feedback control module transmits the instruction to the alarm and triggers the alarm, and immediately stops the jacking construction and takes corrective measures.

8. The pipe jacking construction and measurement and control method for the existing underground space expansion project according to claim 3 is characterized in that: In step S300 and step S400, for monitoring the formation pressure and strain, the formation pressure and strain around the pipe jacking construction area are monitored by the formation pressure sensor and the formation strain sensor, so as to grasp the surrounding formation conditions during the construction in real time.

9. The pipe jacking construction and measurement and control method for the existing underground space expansion project according to claim 3 is characterized in that: In step S300 and step S400, the data processed by the data preprocessing unit is input into the intelligent prediction module and the current construction control quantity is predicted, and then the jacking equipment and the head casing of the pipe jacking machine are controlled by the feedback control module.

10. The pipe jacking construction and measurement and control method for the existing underground space expansion project according to claim 3 is characterized in that: In step S300 and step S400, a counterweight is temporarily added above the top plate of the existing underground space structure to reduce the adverse effect of the jacking reaction force on the internal force and deformation of the top plate of the existing underground space structure; the weight of the counterweight G w Satisfies the following expression: G w =F a -G b In the formula, F a is the jacking force, G b is the weight of the top plate of the existing underground space structure.

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