Underground pipe gallery system integrating microbial remediation and in-situ reinforcement and construction method thereof

Abstract

The application discloses an underground pipe gallery system integrated with microbial repair and in-situ reinforcement and a construction method thereof. The pipe gallery system comprises a microbial supply station and a plurality of assembled pipe units. Each two adjacent assembled pipe units are connected end to end and coaxially docked. The application adopts an assembled underground pipe gallery structure to form an integrated pipe gallery structure. In cooperation with a steel reinforcement cage and an internal repair channel, the structure not only has sufficient connection strength, but also has a certain flexible buffer space. Under the action of a plurality of anchor bodies, an in-situ injection channel is formed to reinforce the soil around the pipe gallery in-situ by using the microorganisms. A microbial delivery and nutrient liquid supply device, the internal repair channel and the in-situ injection channel form an integrated delivery system, so that the microorganisms can act on the concrete cracks and the soil around the pipe gallery respectively. The assembled underground pipe gallery concrete repair and soil reinforcement are synergized to ensure the overall stability and impermeability of the pipe gallery-soil interface.

Description

Technical Field

[0001] This invention belongs to the field of underground integrated utility tunnel construction technology, specifically involving an underground utility tunnel system integrating microbial remediation and in-situ reinforcement and its construction method. Background Technology

[0002] Underground utility tunnels, also known as "common utility tunnels," are integrated tunnels built beneath urban roads to house various pipelines such as municipal utilities, electricity, communications, gas, water supply, and drainage. They effectively prevent the "zipper road" phenomenon, allowing technicians to perform emergency repairs, maintenance, and expansions of pipelines directly within the tunnel without repeatedly excavating the road surface, significantly reducing repair time.

[0003] Underground utility tunnels range in length from several kilometers to tens of kilometers. Because they are buried underground, they are often in a humid environment, which affects the lifespan and normal function of the pipelines and supporting facilities. External pressure can easily cause cracks to form in the concrete structure of underground utility tunnels, leading to water seepage and leakage. Furthermore, when there are gaps between the underground utility tunnel structure and the surrounding soil, the bond strength is low, making it prone to structural layer delamination. This results in insufficient stability of the underground utility tunnel, making it more susceptible to damage during use and shortening its lifespan. Subsequent maintenance is costly and labor-intensive.

[0004] Therefore, it is necessary to research and develop underground utility tunnel systems that integrate microbial remediation and in-situ reinforcement, as well as their construction methods, to solve the above problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an underground utility tunnel system integrating microbial remediation and in-situ reinforcement, along with its construction method, to resolve the technical deficiencies mentioned in the background art.

[0006] The embodiments of the present invention provide the following technical solutions:

[0007] An integrated underground utility tunnel system combining microbial remediation and in-situ reinforcement includes a microbial supply station and multiple assembled pipe units. Each pair of adjacent assembled pipe units is connected end-to-end and coaxially joined. Each assembled pipe unit is a precast concrete component with a reinforcing cage inside. An internal remediation channel for transporting microorganisms and their nutrient solution is fitted inside the reinforcing cage, and overflow micropores are provided on the outer wall of the internal remediation channel. External binding rings are fitted onto the outer sides of both ends of each assembled pipe unit. A cast-in-place assembly is located between two adjacent assembled pipe units and inside the external binding rings. The cast-in-place assembly and the ends of the assembled pipe units on both sides share a vertical shaft. The internal remediation channels in two adjacent assembled pipe units are connected within the vertical shaft. A precast... The precast hole contains an anchor body, which includes an independent first flow channel and a second flow channel. The output end of the first flow channel is provided with a grouting port. The second flow channel is located outside the first flow channel, and its outer wall is provided with multiple repair fluid ports. A nozzle is provided inside each repair fluid port. One end of the anchor body extends out of the assembly pipe unit and is embedded in the soil around the pipe gallery, and the grouting port is inserted into the soil around the pipe gallery. The input end of the first flow channel is injected with grouting material through a grouting pump, and the grouting material is used to fix the anchor body to the assembly pipe unit and the soil around the pipe gallery. The internal repair channel and the second flow channel are both connected to the microbial supply station. The assembly pipe unit is provided with a strain monitoring unit for sensing concrete cracks, leaks, or deformation of the soil around the pipe gallery.

[0008] Preferably, the steel cage includes multiple horizontally placed steel bars arranged in a ring array. Steel ring sleeves are fixedly connected to the outside of the multiple steel bars. The two ends of the horizontally placed steel bars extend to both sides of the assembly pipe unit, and threaded sections are welded to the outside of the ends of the horizontally placed steel bars. The threaded sections of two adjacent assembly pipe units are connected one by one and combined by bidirectional threaded sleeves.

[0009] Preferably, the internal repair channel is a stainless steel pipe, and both ends of the stainless steel pipe extend out of the two end faces of the precast concrete component. Adjacent stainless steel pipes are connected by a flange to form a combined channel, and a ball valve is installed in the combined channel. Both the combined channel and the ball valve are located in the vertical shaft.

[0010] Preferably, the top of the shaft is provided with a placement groove, and a manhole cover is embedded in the placement groove. A sealing packing is provided at the connection between the manhole cover and the placement groove. The upper surface of the manhole cover is flush with the bottom wall of the inner cavity of the pipe gallery, and the inner wall of the cast-in-place assembly is flush with the inner wall of the inner cavity of the pipe gallery.

[0011] Preferably, the number of pre-drilled holes and anchor rod bodies is set to multiple, and the multiple anchor rod bodies correspond one-to-one with the pre-drilled holes. The pre-drilled holes are set perpendicular to the outer wall of the assembly pipe unit, and the multiple anchor rod bodies are distributed radially along the assembly pipe unit.

[0012] Preferably, the precast concrete component of the assembly pipe unit has a storage cavity reserved on the inner side, the storage cavity is corresponding to the position of the internal repair channel, and a storage layer is integrally cast in the storage cavity, the storage layer wrapping the outside of the internal repair channel.

[0013] A stepped protective layer is wrapped around the outside of the assembly tube unit. The stepped protective layer includes multiple porous sleeves, which are nested together end to end and fixed by connecting rods. Each porous sleeve is composed of two axially symmetrically distributed semi-ring plates. The inner wall of the semi-ring plate is fitted to the outer wall of the assembly tube unit, and the semi-ring plate has through holes that correspond one-to-one with the pre-made holes, so that the anchor rod body passes through the pre-made holes and through holes in sequence.

[0014] Both the accumulation layer and the semi-ring plate are formed by casting porous concrete.

[0015] Preferably, the microbial supply station includes a microbial culture unit, a nutrient solution storage unit, and a delivery control unit. A first control valve and a second control valve are respectively provided at the output ends of the microbial culture unit and the nutrient solution storage unit, and both the first control valve and the second control valve are electrically connected to the delivery control unit to control the output speed and supply of microorganisms and nutrient solution.

[0016] Preferably, a flow sensor is also provided in the output pipe of the microbial culture unit and the nutrient solution storage unit. A mixing unit is provided outside the output pipe of the microbial culture unit and the nutrient solution storage unit. A thermometer and a pH sensor are provided inside the mixing unit. The flow sensor is used to sense the flow rate of the fluid output from the microbial culture unit and the nutrient solution storage unit. The thermometer and the pH sensor sense the temperature and pH value of the mixture of microorganisms and nutrient solution, respectively.

[0017] Preferably, the strain monitoring unit includes a crack strain sensor and a soil pressure sensor. The soil pressure sensor is attached to the outer wall of the precast concrete component to sense the deformation and pressure changes of the soil around the pipe gallery. The crack strain sensor is installed inside the precast concrete component to monitor internal cracks and leakage.

[0018] Preferably, the connection end of the conveying control unit is equipped with a microcontroller, and an A / D converter and a D / A converter are respectively provided at the input and output ends of the microcontroller. The crack strain sensor, soil pressure sensor, flow sensor, thermometer and pH sensor are all electrically connected to the A / D converter. The connection end of the microcontroller is electrically connected to a display. The first control valve, the second control valve and the pump connected to the internal repair channel are all electrically connected to the D / A converter.

[0019] This invention also provides a construction method for an underground utility tunnel system integrating microbial remediation and in-situ reinforcement, comprising the following steps:

[0020] S1. Pipe Gallery Foundation Pit Cleaning: Remove the support of the pipe gallery foundation pit, clean up the holes on the foundation pit or the garbage and building materials at the bottom of the foundation pit, compact the side walls and bottom walls of the foundation pit, and dry them.

[0021] S2. Pipe Gallery Laying: Fill the pipe gallery pit with assembled pipe units. When the assembled pipe units enter, they are erected and all assembled pipe units are coaxially distributed and flush with the bottom wall of the inner cavity of the assembled pipe unit. Using multiple sets of oppositely arranged threaded segments and bidirectional threaded sleeves, adjacent assembled pipe units are connected and tightened until the ends of two adjacent outer rings abut. The assembled pipe units are filled into the pit in sequence.

[0022] S3. Processing and casting the assembly: An inner lining model plate is installed in the inner cavity at the connection between two adjacent assembly pipe units. A filling cavity is formed between the inner lining model plate, the outer binding ring, and the side wall of the assembly pipe unit. Concrete is poured into the filling cavity, and a groove cavity for the vertical shaft is reserved. After solidification, the casting assembly is formed, forming an integrated pipe gallery structure. The inner lining model plate is then removed.

[0023] S4. Internal Repair Channel Connection: A combined channel with a ball valve is installed between the internal repair channels of two adjacent assembly pipe units via a flange. The fluid injection of one or more internal repair channels is controlled by controlling the opening and closing of the ball valve. After installation, a well cover is installed on the top of the shaft.

[0024] S5. Reinforcement of the assembled pipe unit: Backfill the gap between the inner wall of the foundation pit and the outer wall of the assembled pipe unit with soil and compact it.

[0025] S6. Reinforcement of integrated utility tunnel structure: The anchor rod body is driven into the soil around the utility tunnel from the precast hole, and then the grouting material is filled into the soil around the utility tunnel and the gap between the precast hole and the anchor rod body through the first flow channel and grouting port to further reinforce the integrated utility tunnel structure.

[0026] S7. In-situ microbial reinforcement: Microbial liquid is injected into the soil around the pipe gallery and the grouting material outside the anchor body through pumps, a second flow channel and nozzles, inducing mineralization reaction in the soil to form cemented deposits, thereby achieving in-situ reinforcement of the soil around the pipe gallery.

[0027] S8. Automatic maintenance of the utility tunnel: A microbial supply station is built outside the utility tunnel, equipped with a delivery control unit and a strain monitoring unit. Through the combination of solenoid valves and pumps, automated monitoring and control are achieved. When cracks or leaks appear in the concrete of the assembled pipe unit or when the soil around the utility tunnel deforms, microbial liquid is automatically injected to achieve maintenance of the utility tunnel.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. A prefabricated underground utility tunnel structure is formed by connecting multiple prefabricated pipe units end to end. Adjacent prefabricated pipe units are connected by threaded sections, bidirectional threaded sleeves, outer binding rings, and cast-in-place assemblies to form an integrated utility tunnel structure. With the help of steel cages and internal repair channels, it not only has sufficient connection strength but also provides the structure with a certain degree of flexible buffer space. Under the action of multiple anchor bolts, an in-situ injection channel is formed to reinforce the soil around the utility tunnel with microorganisms in situ. The microbial transport and nutrient solution supply device forms an integrated transport system with the internal repair channel and the in-situ injection channel, enabling microorganisms to act on concrete cracks and the soil around the utility tunnel respectively. This achieves the synergistic effect of concrete repair and soil reinforcement in the prefabricated underground utility tunnel, ensuring the overall stability and impermeability of the utility tunnel-soil interface and greatly improving its service life.

[0030] 2. After cleaning, compacting, and drying the foundation pit of the utility tunnel, the gaps are filled after the utility tunnel is laid to form an integrated underground utility tunnel structure. A biological nutrient solution containing urease-producing bacteria is injected. The pore water and the injected nutrient solution induce calcium carbonate precipitation in the concrete cracks and / or the pores of the surrounding soil. CaCO3 crystals form cemented deposits in the concrete cracks and / or the pores of the surrounding soil, filling the pores, improving the bonding strength between the assembled pipe units and the surrounding soil, effectively preventing structural layer peeling, and enhancing the interfacial bonding performance. In addition, an intelligent monitoring system is added to realize automated monitoring and control. When cracks or leaks appear in the concrete of the assembled pipe units or when the soil around the utility tunnel deforms, the microbial solution is automatically injected to realize the automatic maintenance of the utility tunnel. This avoids the problem of leakage or further breakage caused by cracks or gaps that cannot be repaired in time. No manual inspection and treatment are required, resulting in low maintenance costs. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the layout structure of the underground utility tunnel system provided by the present invention.

[0032] Figure 2 A schematic diagram of microbial broth flow in the underground utility tunnel system provided by this invention.

[0033] Figure 3 This is a side view of the installation structure of the assembled pipe unit and the pipe gallery foundation pit in this invention.

[0034] Figure 4 This is a perspective view of the combined structure of two adjacent sets of assembly tube units in this invention.

[0035] Figure 5 For the present invention Figure 4 A three-dimensional cross-sectional view of the structure shown.

[0036] Figure 6 This is a schematic diagram of the distribution structure of the assembly pipe unit, outer bundle ring, casting assembly and shaft in this invention.

[0037] Figure 7 This is a schematic diagram of the distribution structure of the steel cage and internal repair channels in this invention.

[0038] Figure 8 This is a perspective view of the anchor bolt body in this invention.

[0039] Figure 9 This is a perspective view of the assembly tube unit and stepped protective layer combination structure provided in Embodiment 2 of the present invention.

[0040] Figure 10 The left view shows the assembly tube unit and stepped protective layer combination structure provided in Embodiment 2 of the present invention.

[0041] Figure 11 For the present invention Figure 10 Sectional view along line AA.

[0042] Figure 12 This is a structural block diagram of a microbial supply station provided in Embodiment 1 of the present invention.

[0043] Figure 13 The control principle diagram of the intelligent maintenance system provided by the present invention.

[0044] Marked in the image:

[0045] Assembly pipe unit-1; Microbial supply station-2; Reinforcing cage-3; Internal repair channel-4; Outer binding ring-5; Cast-in-place assembly-6; Vertical shaft-7; Precast hole-8; Anchor bolt body-9; Manhole cover-10; Crack strain sensor-11; Soil pressure sensor-12; Microcontroller-13; Display-14; Pump-15; Combined channel-16; Ball valve-17; Stepped protective layer-18;

[0046] Accumulation chamber-101; Accumulation layer-102;

[0047] Microbial culture unit-201; Nutrient solution storage unit-202; Delivery control unit-203; First control valve-204; Second control valve-205; Flow sensor-206; Mixing unit-207; Thermometer-208; pH sensor-209;

[0048] Horizontal reinforcing bar segment-301; Steel ring sleeve-302; Threaded segment-303; Bidirectional threaded sleeve-304;

[0049] First flow channel - 901; Second flow channel - 902; Grouting port - 903; Nozzle - 904;

[0050] Multi-hole sleeve-181; connecting rod-182; semi-ring plate-1811. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can refer to a detachable connection: it can be a mechanical connection; it can also be an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] like Figures 1-8 As shown, the integrated underground utility tunnel system combining microbial remediation and in-situ reinforcement includes a microbial supply station 2 and multiple prefabricated pipe units 1. Each pair of adjacent prefabricated pipe units 1 are connected end-to-end and coaxially joined to form a prefabricated underground utility tunnel structure. The prefabricated pipe unit 1 is made of precast concrete, and a reinforcing cage 3 is installed inside the precast concrete component. An internal repair channel 4 for transporting microorganisms and their nutrient solution is fitted inside the reinforcing cage 3. Overflow micropores are provided on the outer wall of the internal repair channel 4 to transport microorganisms and their nutrient solution to the concrete crack area to achieve crack repair. As a microbial repair structure for concrete cracks, in the embodiments provided by this invention, the internal repair channel 4 can be configured as a microporous delivery pipe, a porous repair strip, or a combination of both, with microporous structures on its wall or surface for releasing microorganisms and their nutrient solution. The internal repair channel 4 is located in areas of concentrated tensile stress or prone to cracking in the top slab, side walls, or bottom slab of the utility tunnel.

[0055] Outer retaining rings 5 ​​are fitted onto the outer sides of both ends of the assembly pipe unit 1. A casting assembly 6 is provided between two adjacent assembly pipe units 1 and inside the outer retaining rings 5. A vertical shaft 7 is provided together with the casting assembly 6 and the ends of the assembly pipe units 1 on both sides. The internal repair channels 4 in the two adjacent assembly pipe units 1 are connected in the vertical shaft 7. The outer retaining rings 5 ​​are made of elastic metal, and the casting assembly 6 is made of concrete. The ends of the outer retaining rings 5 ​​extend out of one side of the assembly pipe unit 1, forming a groove on the inner side of the outer retaining rings 5.

[0056] A pre-drilled hole 8 is provided through the outer wall of the assembly pipe unit 1, and an anchor body 9 is installed inside the pre-drilled hole 8. After the anchor body 9 is assembled in the pre-drilled hole 8, it forms an in-situ injection channel for in-situ microbial reinforcement of the soil around the pipe gallery. The anchor body 9 includes an independent first flow channel 901 and a second flow channel 902. The output end of the first flow channel 901 is provided with a grouting port 903. The second flow channel 902 is located outside the first flow channel 901, and the outer wall of the second flow channel 902 is provided with multiple repair fluid ports. A nozzle 904 is provided inside the repair fluid ports. One end of the anchor body 9 extends out of the assembly pipe unit 1 and is embedded in the soil around the pipe gallery, and the grouting port 903 is inserted into the soil around the pipe gallery. The pre-drilled hole 8 is connected to the soil around the pipe gallery and is used to deliver microorganisms and their nutrient solution to the soil around the pipe gallery to induce mineralization reaction in the soil to form cemented deposits, thereby achieving in-situ reinforcement of the soil around the pipe gallery.

[0057] The input end of the first flow channel 901 is injected with grouting material via a grouting pump. This grouting material then secures the anchor body 9 to the assembled pipe unit 1 and the surrounding soil of the pipe gallery. The internal repair channel 4 and the second flow channel 902 are both connected to the microbial supply station 2. A strain monitoring unit is installed on the assembled pipe unit 1 to detect concrete cracks, leaks, or deformation of the surrounding soil. Both the internal repair channel 4 and the in-situ injection channel are pre-embedded during the prefabrication of the prefabricated underground pipe gallery components, forming a continuous microbial delivery network after assembly. The concrete crack microbial repair structure and the in-situ microbial reinforcement structure are each connected to independent microbial delivery and nutrient solution supply devices. These devices, along with the internal repair channel 4 and the in-situ injection channel, form an integrated delivery system, enabling microorganisms to act on both the concrete cracks and the surrounding soil of the pipe gallery, achieving a synergistic effect of concrete repair and soil reinforcement in the prefabricated underground pipe gallery.

[0058] Furthermore, in the above scheme, the steel cage 3 includes multiple horizontally placed steel bar segments 301 arranged in a ring array. Steel ring sleeves 302 are fixedly connected to the outside of the multiple steel bar segments. The two ends of the horizontally placed steel bar segments 301 extend out to both sides of the assembly pipe unit 1, and threaded segments 303 are welded to the outside of the ends of the horizontally placed steel bar segments 301. The threaded segments 303 of two adjacent assembly pipe units 1 are connected one by one and combined by bidirectional threaded sleeves 304.

[0059] Furthermore, in the above scheme, the internal repair channel 4 is set as a stainless steel pipe, and both ends of the stainless steel pipe extend out of the two end faces of the precast concrete component. Adjacent stainless steel pipes are connected by a combined channel 16 via flanges, and a ball valve 17 is installed inside the combined channel 16. Both the combined channel 16 and the ball valve 17 are located within the vertical shaft 7. The internal repair channel 4 can be a straight pipe, a corrugated pipe, or a spiral pipe. For example, the embodiment provided by this invention uses a spiral pipe.

[0060] Furthermore, in the above scheme, a placement groove is provided at the top of the shaft 7, and a manhole cover 10 is embedded in the placement groove. A sealing packing is provided at the connection between the manhole cover 10 and the placement groove. The upper surface of the manhole cover 10 is flush with the bottom wall of the inner cavity of the pipe gallery, and the inner wall of the cast-in-place assembly 6 is flush with the inner wall of the inner cavity of the pipe gallery.

[0061] Furthermore, in the above scheme, the number of prefabricated holes 8 and anchor bodies 9 is set to multiple, and the multiple anchor bodies 9 correspond one-to-one with the prefabricated holes 8. The prefabricated holes 8 are set perpendicular to the outer wall of the assembly pipe unit 1, and the multiple anchor bodies 9 are distributed radially along the assembly pipe unit 1. The in-situ injection channels are arranged in a circumferential, radial, or combined manner along the outer wall or bottom plate of the pipe gallery, forming a continuous or local microbial reinforcement zone around the pipe gallery. When processing the prefabricated holes 8, the steel cage 3 and the internal repair channel 4 are avoided.

[0062] like Figures 9-11 As shown, in a further preferred embodiment of the precast concrete component of the assembly pipe unit 1: a storage cavity 101 is reserved inside the precast concrete component of the assembly pipe unit 1, the storage cavity 101 corresponds to the position of the internal repair channel 4, and a storage layer 102 is integrally cast inside the storage cavity 101, which wraps around the outside of the internal repair channel 4. The storage layer 102 is cast using porous concrete. In the precast concrete component, and in the area corresponding to the layout of the internal repair channel 4, microbial liquid is stored through the porous storage layer 102, which induces calcium carbonate precipitation during use. In addition, by filling the storage cavity 101 with the storage layer 102, the remaining part of the precast concrete component of the assembly pipe unit 1 is cast using high-strength concrete material. In this way, the overall strength of the assembly pipe unit 1 is guaranteed, and the crack repair effect of the precast concrete component of the assembly pipe unit 1 is improved.

[0063] A stepped protective layer 18 is wrapped around the outside of the assembly pipe unit 1. The stepped protective layer 18 includes multiple porous sleeves 181, which are nested end to end and connected by connecting rods 182. Each porous sleeve 181 is composed of two axially symmetrically distributed semi-ring plates 1811, which are cast from porous concrete. The inner wall of the semi-ring plate 1811 fits against the outer wall of the assembly pipe unit 1, and the semi-ring plate 1811 has through holes corresponding to the pre-cast holes 8, allowing the anchor rod body 9 to pass through the pre-cast holes 8 and the through holes in sequence. The two symmetrically distributed semi-ring plates 1811 are fastened to the outside of the assembly pipe unit 1 to form porous sleeves 181, which are nested end to end. After installation, connecting rods 182 are inserted into the through holes at the ends of the semi-ring plates 1811 to improve the integration. This connection increases the contact area between the stepped protective layer 18 and the surrounding soil of the utility tunnel. Furthermore, the stepped protective layer 18 is made of porous material, storing microbial inoculum and inducing calcium carbonate precipitation during use. This improves the friction with the surrounding soil and the overall stability of the structure.

[0064] like Figure 12 As shown, the microbial supply station 2 includes a microbial cultivation unit 201, a nutrient solution storage unit 202, and a delivery control unit 203. A first control valve 204 and a second control valve 205 are respectively installed at the output ends of the microbial cultivation unit 201 and the nutrient solution storage unit 202, and both are electrically connected to the delivery control unit 203 to control the output speed and supply volume of microorganisms and nutrient solution. A biological nutrient solution containing urease-producing bacteria can be injected into the microbial cultivation unit 201. Using pore water and the injected nutrient solution, calcium carbonate precipitation is induced in the concrete cracks and / or the pores of the soil around the pipe gallery. CaCO3 crystals form cemented deposits in the concrete cracks and / or the pores of the soil around the pipe gallery, filling the pores, improving the bonding strength between the assembled pipe unit 1 and the soil around the pipe gallery, effectively preventing structural layer peeling, and enhancing interfacial adhesion. This ensures the overall stability and impermeability of the pipe gallery-soil interface.

[0065] The delivery control unit 203 can independently control the internal repair channels 4 and / or in-situ injection channels of different assembly tube units 1, and can also connect the internal repair channels 4 of multiple assembly tube units 1 by opening the ball valve 17 for simultaneous repair.

[0066] Furthermore, in the above scheme, a flow sensor 206 is also installed in the output pipe of the microbial culture unit 201 and the nutrient solution storage unit 202. A mixing unit 207 is installed outside the output pipe of the microbial culture unit 201 and the nutrient solution storage unit 202. A thermometer 208 and a pH sensor 209 are installed inside the mixing unit 207. The flow sensor 206 is used to sense the flow rate of the fluid output from the microbial culture unit 201 and the nutrient solution storage unit 202. The thermometer 208 and the pH sensor 209 sense the temperature and pH value of the mixture of microorganisms and nutrient solution, respectively.

[0067] Furthermore, in the above scheme, the strain monitoring unit includes a crack strain sensor 11 and a soil pressure sensor 12. The soil pressure sensor 12 is attached to the outer wall of the precast concrete component. In the embodiment where the stepped protective layer 18 is assembled, the soil pressure sensor 12 can be installed on the outer wall of the stepped protective layer 18 to sense the deformation and pressure changes of the soil around the pipe gallery. The crack strain sensor 11 is set inside the precast concrete component to monitor the internal cracks and leakage of the precast concrete component.

[0068] like Figure 13 As shown, a microcontroller 13 is installed at the connection end of the delivery control unit 203. An A / D converter and a D / A converter are respectively installed at the input and output ends of the microcontroller 13. The crack strain sensor 11, soil pressure sensor 12, flow sensor 206, thermometer 208, and pH sensor 209 are all electrically connected to the A / D converter. A display 14 is electrically connected to the connection end of the microcontroller 13 to display monitoring data. The first control valve 204, the second control valve 205, and the pump 15 connected to the internal repair channel 4 are all electrically connected to the D / A converter. When the monitoring results reach a set threshold, the microbial repair or in-situ microbial reinforcement process is triggered. Microbial delivery and nutrient solution supply can be valve-controlled or metered, allowing the concrete crack repair process to be carried out in stages or multiple times.

[0069] The circuits and controls involved in this invention are all existing technologies and will not be described in detail here.

[0070] This invention also provides a construction method for an underground utility tunnel system integrating microbial remediation and in-situ reinforcement, comprising the following steps:

[0071] S1. Pipe Gallery Foundation Pit Cleaning: Remove the support of the pipe gallery foundation pit, clean up the holes on the foundation pit or the garbage and building materials at the bottom of the foundation pit, compact the side walls and bottom walls of the foundation pit, and dry them.

[0072] S2. Pipe Gallery Laying: Fill the pipe gallery pit with assembled pipe units 1. When the assembled pipe units 1 enter, erect them and make all the assembled pipe units 1 coaxially distributed and flush with the bottom wall of the inner cavity of the assembled pipe unit 1. Use multiple sets of oppositely arranged threaded sections 303 and bidirectional threaded sleeves 304 to connect and fasten adjacent assembled pipe units 1 until the ends of two adjacent outer rings 5 ​​abut together. Fill the pit with assembled pipe units 1 in sequence.

[0073] S3. Processing and casting assembly 6: An inner lining model plate is installed in the inner cavity at the connection between two adjacent assembly pipe units 1. A filling cavity is formed between the inner lining model plate, the outer binding ring 5, and the side wall of the assembly pipe unit 1. Concrete is poured into the filling cavity, and a groove cavity for the vertical shaft 7 is reserved. After solidification, the casting assembly 6 is formed, forming an integrated pipe gallery structure. The inner lining model plate is then removed.

[0074] S4, Internal Repair Channel 4 Connection: A combined channel 16 with a ball valve 17 is installed between the internal repair channels 4 of two adjacent assembly pipe units 1 via a flange. By controlling the opening / closing of the ball valve 17, liquid injection control is performed on one or more internal repair channels 4. After installation, a well cover 10 is installed on the top of the vertical shaft 7.

[0075] S5. Reinforcement of Assembly Pipe Unit 1: Backfill the gap between the inner wall of the foundation pit and the outer wall of Assembly Pipe Unit 1 with soil and compact it.

[0076] S6. Reinforcement of integrated utility tunnel structure: The anchor body 9 is driven into the soil around the utility tunnel from the precast hole 8. Then, the grouting material is filled into the soil around the utility tunnel and the gap between the precast hole 8 and the anchor body 9 through the first flow channel 901 and the grouting port 903 to further reinforce the integrated utility tunnel structure.

[0077] S7. Microbial in-situ reinforcement: Microbial liquid is injected into the soil around the pipe gallery and the grouting material outside the anchor body 9 through pump 15, second flow channel 902 and nozzle 904 to induce mineralization reaction in the soil and form cemented deposits, thereby achieving in-situ reinforcement of the soil around the pipe gallery.

[0078] S8. Automatic maintenance of the utility tunnel: A microbial supply station 2 is constructed outside the utility tunnel, equipped with a delivery control unit 203 and a strain monitoring unit. Through the combination of solenoid valves and pumps 15, automatic monitoring and control are achieved. When cracks or leaks appear in the concrete of the assembled pipe unit 1 or when the soil around the utility tunnel deforms, microbial liquid is automatically injected to achieve automatic maintenance of the utility tunnel, avoiding the problem of leakage or further breakage caused by cracks or gaps that cannot be repaired in time.

[0079] The above are merely specific embodiments of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. An underground utility tunnel system integrating microbial remediation and in-situ reinforcement, comprising a microbial supply station (2) and multiple assembled pipe units (1), wherein every two adjacent assembled pipe units (1) are connected end-to-end and coaxially connected, characterized in that: The assembly pipe unit (1) is made of precast concrete components, and a steel cage (3) is provided inside the precast concrete components. An internal repair channel (4) for conveying microorganisms and their nutrient solution is provided on the inner side of the steel cage (3). An overflow microhole is provided on the outer wall of the internal repair channel (4). An outer ring (5) is sleeved on both sides of the assembly pipe unit (1). A casting assembly (6) is provided between two adjacent assembly pipe units (1) and inside the outer ring (5). A vertical shaft (7) is opened together at the ends of the casting assembly (6) and the assembly pipe units (1) on both sides. The internal repair channels (4) in two adjacent assembly pipe units (1) are connected in the vertical shaft (7). The outer wall of the assembly pipe unit (1) is provided with a prefabricated hole (8), and the prefabricated hole (8) is provided with an anchor body (9). The anchor body (9) includes a first flow channel (901) and a second flow channel (902) that are independent of each other. The output end of the first flow channel (901) is provided with a grouting port (903). The second flow channel (902) is located outside the first flow channel (901), and the outer wall of the second flow channel (902) is provided with multiple repair liquid ports. A nozzle (904) is provided inside the repair liquid port. One end of the anchor body (9) extends out of the assembly pipe unit (1) and is embedded in the soil around the pipe gallery, and the grouting port (903) is inserted into the soil around the pipe gallery. The first flow channel (901) is injected with grouting material by a grouting pump at its input end, and the anchor body (9) is fixedly connected to the assembly pipe unit (1) and the soil around the pipe gallery by the grouting material. The internal repair channel (4) and the second flow channel (902) are both connected to the microbial supply station (2). The assembly pipe unit (1) is equipped with a strain monitoring unit for sensing concrete cracks, leakage or deformation of the soil around the pipe gallery in the assembly pipe unit (1). The internal repair channel (4) is set as a stainless steel pipe, and the two ends of the stainless steel pipe extend out of the two ends of the precast concrete component. A combined channel (16) is connected between two adjacent stainless steel pipes by a flange, and a ball valve (17) is set in the combined channel (16). The combined channel (16) and the ball valve (17) are both set in the vertical shaft (7). The top of the shaft (7) is provided with a placement groove, and a well cover (10) is embedded in the placement groove. A sealing packing is provided at the connection between the well cover (10) and the placement groove. The upper surface of the well cover (10) is flush with the bottom wall of the inner cavity of the pipe gallery, and the inner wall of the cast-in-place assembly (6) is flush with the inner wall of the inner cavity of the pipe gallery.

2. The underground utility tunnel system integrating microbial remediation and in-situ reinforcement according to claim 1, characterized in that: The steel cage (3) includes multiple horizontally placed steel bars (301) arranged in a ring array. Steel ring sleeves (302) are fixedly connected to the outside of the multiple steel bars. The two ends of the horizontally placed steel bars (301) extend out to both sides of the assembly pipe unit (1), and threaded sections (303) are welded to the outside of the ends of the horizontally placed steel bars (301). The threaded sections (303) of two adjacent assembly pipe units (1) are connected one by one and combined by bidirectional threaded sleeves (304).

3. The underground utility tunnel system integrating microbial remediation and in-situ reinforcement according to claim 1, characterized in that: The precast concrete component of the assembly pipe unit (1) has a storage cavity (101) reserved on the inner side. The storage cavity (101) corresponds to the position of the internal repair channel (4). The storage cavity (101) is integrally cast with a storage layer (102), which wraps around the outside of the internal repair channel (4). A stepped protective layer (18) is wrapped around the outside of the assembly tube unit (1). The stepped protective layer (18) includes multiple porous sleeves (181), and the multiple porous sleeves (181) are connected end to end in sequence and fixed by connecting rods (182). The porous sleeves (181) are composed of two axially symmetrically distributed semi-ring plates (1811). The inner wall of the semi-ring plate (1811) is fitted to the outer wall of the assembly tube unit (1), and the semi-ring plate (1811) has through holes corresponding to the pre-made holes (8) one by one, so that the anchor body (9) passes through the pre-made holes (8) and the through holes in sequence. Both the accumulation layer (102) and the semi-ring plate (1811) are formed by casting porous concrete.

4. The underground utility tunnel system integrating microbial remediation and in-situ reinforcement according to claim 2, characterized in that: The microbial supply station (2) includes a microbial culture unit (201), a nutrient solution storage unit (202), and a delivery control unit (203). A first control valve (204) and a second control valve (205) are respectively provided at the output ends of the microbial culture unit (201) and the nutrient solution storage unit (202). The first control valve (204) and the second control valve (205) are electrically connected to the delivery control unit (203) to control the output speed and supply of microorganisms and nutrient solution.

5. The underground utility tunnel system integrating microbial remediation and in-situ reinforcement according to claim 4, characterized in that: A flow sensor (206) is also installed in the output pipe of the microbial culture unit (201) and the nutrient solution storage unit (202). A mixing unit (207) is installed outside the output pipe of the microbial culture unit (201) and the nutrient solution storage unit (202). A thermometer (208) and a pH sensor (209) are installed inside the mixing unit (207). The flow sensor (206) is used to sense the flow rate of the fluid output from the microbial culture unit (201) and the nutrient solution storage unit (202). The thermometer (208) and the pH sensor (209) sense the temperature and pH value of the mixture of microorganisms and nutrient solution, respectively.

6. The underground utility tunnel system integrating microbial remediation and in-situ reinforcement according to claim 5, characterized in that: The strain monitoring unit includes a crack strain sensor (11) and a soil pressure sensor (12). The soil pressure sensor (12) is attached to the outer wall of the precast concrete component to sense the deformation and pressure changes of the soil around the pipe gallery. The crack strain sensor (11) is installed inside the precast concrete component to monitor the internal cracks and leakage of the precast concrete component.

7. The underground utility tunnel system integrating microbial remediation and in-situ reinforcement according to claim 6, characterized in that: The connection end of the conveying control unit (203) is equipped with a microcontroller (13). An A / D converter and a D / A converter are respectively provided at the input and output ends of the microcontroller (13). The crack strain sensor (11), soil pressure sensor (12), flow sensor (206), thermometer (208) and pH sensor (209) are all electrically connected to the A / D converter. The connection end of the microcontroller (13) is electrically connected to a display (14). The first control valve (204), the second control valve (205) and the pump (15) connected to the internal repair channel (4) are all electrically connected to the D / A converter.

8. The construction method of the underground utility tunnel system integrating microbial remediation and in-situ reinforcement as described in claim 7, characterized in that: Includes the following steps: S1. Pipe gallery foundation pit cleanup: Remove the support of the pipe gallery foundation pit, clean up the holes on the foundation pit or the garbage and building materials at the bottom of the foundation pit, compact the side walls and bottom walls of the foundation pit, and dry them. S2. Pipe Gallery Laying: Fill the pipe gallery pit with assembled pipe units (1). When the assembled pipe units (1) enter, they are erected and all assembled pipe units (1) are coaxially distributed and located flush with the bottom wall of the inner cavity of the assembled pipe unit (1). Using multiple sets of oppositely arranged threaded sections (303) and bidirectional threaded sleeves (304), two adjacent assembled pipe units (1) are connected and tightened until the ends of two adjacent outer rings (5) abut together. Fill the pit with assembled pipe units (1) in sequence. S3, Processing and casting the assembly (6): Install the inner lining model plate at the connection of two adjacent assembly pipe units (1), form a filling cavity between the inner lining model plate and the outer binding ring (5) and the side wall of the assembly pipe unit (1), pour concrete into the filling cavity, and reserve the groove cavity of the vertical shaft (7). After solidification, the casting assembly (6) is formed, forming an integrated pipe gallery structure. Remove the inner lining model plate. S4, Internal Repair Channel (4) Connection: A combined channel (16) with a ball valve (17) is installed between the internal repair channels (4) of two adjacent assembly pipe units (1) through a flange. By controlling the opening / closing of the ball valve (17), liquid injection control is performed on one or more internal repair channels (4). After installation, a well cover (10) is installed on the top of the vertical shaft (7). S5. Reinforcement of the assembly pipe unit (1): Backfill the gap between the inner wall of the foundation pit and the outer wall of the assembly pipe unit (1) with soil and compact it; S6. Reinforcement of integrated pipe gallery structure: The anchor body (9) is driven into the soil around the pipe gallery from the precast hole (8), and then the grouting material is filled into the soil around the pipe gallery and the gap between the precast hole (8) and the anchor body (9) through the first flow channel (901) and the grouting port (903) to further reinforce the integrated pipe gallery structure. S7. Microbial in-situ reinforcement: Microbial liquid is injected into the soil around the pipe gallery and the grouting material outside the anchor body (9) through the pump (15), the second flow channel (902) and the nozzle (904) to induce mineralization reaction in the soil to form cemented deposits, thereby achieving in-situ reinforcement of the soil around the pipe gallery. S8. Automatic maintenance of the pipe gallery: A microbial supply station (2) is built outside the pipe gallery, and a delivery control unit (203) and a strain monitoring unit are set up. Through the combination of solenoid valve and pump (15), automatic monitoring and control are realized. When cracks or leaks appear in the concrete of the assembled pipe unit (1) or the soil around the pipe gallery is deformed, microbial liquid is automatically injected to realize the maintenance of the pipe gallery.

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