44 results about "Utility tunnel" patented technology

This invention relates to a substation structure and construction method suitable for small-section utility tunnels. The structure comprises a two-story building with side walls on the outer perimeter and a larger upper section and a smaller lower section. The lower level is a small-section utility tunnel housing municipal utility pipelines, while the upper level is a large-section substation equipment room. Several reinforced partition walls are installed below the equipment room and on one side of the utility tunnel for support, with the spaces between these partition walls filled with plain concrete. In traditional integrated utility tunnel substation structures, the width of the two-story substation is typically the same as the width of the lower standard compartment. Compared to the lower small-section utility tunnel, the upper substation has a relatively larger cross-section. The excess portion is supported by reinforced partition walls at the bottom. This design effectively increases the stability of the overall utility tunnel structure while meeting the overall functional requirements of the substation, extending its service life and fulfilling the overall usage needs of the utility tunnel.

The utility model discloses a utility tunnel inner pre -buried plate installation positioner, including the two vertical support of affixing in the concrete form outside, the sliding connection of vertical support between multiple horizontal supports, set up at least two locating pin holes on horizontal support, and multiple support bolt passes through locating pin hole and concrete form on horizontal support in proper order, and the pre -buried plate upper end portion limit of concrete form inside, and support bolt one end is welded with pre -buried plate, and the other end is connected with horizontal support. The device stands in the concrete form outside, and the pre -buried plate is placed in the concrete form inside, and after the pre -buried plate upper end portion limit of support bolt, realizes the firm fixing of pre -buried plate and first form and the device through welding etc. The device can realize the quick, accurate positioning of multiple pre -buried plates, is not easy to be disturbed displacement in the concrete pouring process, greatly improves the efficiency of utility tunnel electromechanical installation pre -buried plate installation work, and can be repeatedly used.

This invention relates to the field of prefabrication technology for utility tunnels, and proposes a prefabrication template for utility tunnels, including a base frame with several side fixed plates spaced apart on the base frame; a side movable plate is provided between every two adjacent side fixed plates, and the side movable plate is movably mounted on the base frame; a base plate is provided between adjacent side movable plates and side fixed plates, the base plate is fixed to the base frame, and the base plate is fixedly connected to the adjacent side fixed plates; the side movable plate is located between two base plates and moves between the two base plates; when the side movable plate abuts against one end of a base plate, the base plate, the side fixed plates on the left and right sides, and the side movable plates on the side fixed plates and the side movable plates on the side fixed plates form a "U"-shaped side enclosure component; a front support plate is used to detachably cover the front end of the side enclosure component; a rear support plate is used to detachably cover the rear end of the side enclosure component. Through the above technical solution, the problems of existing technologies requiring a large number of steel components, occupying a large area, and wasting space are solved.

This invention discloses an LSTM-driven dynamic prediction method and system for the operational resilience of integrated utility tunnels, relating to the field of deep learning. The method includes: acquiring vibration acceleration time histories, extracting peak acceleration and vibration energy accumulation time history curves, and generating a dynamic angle sequence; correcting the baseline vulnerability curve to obtain a dynamic damage probability curve, substituting the peak acceleration and vibration energy accumulation values ​​of the cross-section into the curve, and outputting a time-varying damage index sequence; identifying critical cross-sections with abrupt changes in the damage index, calculating the average damage index using the critical cross-section as a dividing point, and determining functional bottleneck sections; obtaining the average damage index and the redundancy of subsequent alternative paths, calculating the overall functional degradation rate of the utility tunnel, and obtaining the functional recovery multiple; calculating the initial recovery time, inputting it into a pre-trained dynamic time-series prediction model, and outputting the corrected final recovery time. This invention solves the problem of low prediction accuracy and high misjudgment rate in the prediction of the operational resilience of integrated utility tunnels due to the reliance on static experience for rough estimation in existing technologies.

The application discloses a construction method of a non-reverse excavation type outlet pipeline of a cast-in-place pipe gallery, in the process of the construction of the comprehensive pipe gallery, the construction of the transverse connecting channel is simultaneously performed, and the prefabricated well section is installed in the connecting channel to form the outlet well, and the comprehensive pipe gallery, the connecting channel and the outlet well form the through outlet channel, so that compared with the prior art, the main structure of the pipe gallery is not damaged, the service life of the main body of the pipe gallery can be prolonged, meanwhile, the waterproof structure is arranged at each connecting position of the outlet well, the risk of leakage can be further reduced, and the construction period and the construction cost can be greatly reduced compared with the prior art.

This invention relates to the field of integrated utility tunnel construction technology, specifically to a data-driven digital twin construction control method and system for integrated utility tunnels. The method acquires a theoretical pose matrix, real-time pose perception vector, environmental disturbance coefficient matrix, joint quality experience matrix, structural safety margin index, and surface defect feature vector. Combining the theoretical pose matrix, real-time pose perception vector, and surface defect feature vector, a Bayesian network is used to perform pose deviation-defect coupling calculation. The structural safety margin index is used as a scaling factor to correct the calculation results, obtaining a dynamic compensation matrix. Fuzzy comprehensive evaluation is performed using the environmental disturbance coefficient matrix and joint quality experience matrix to establish an environmental-quality dual-factor risk membership function, obtaining a construction risk weight vector. The corrected compensation matrix and construction risk weight vector are then used to generate control instructions through an adaptive MPC algorithm based on rolling time-domain optimization. This invention improves the quality and efficiency of utility tunnel construction.

This application discloses an integrated utility tunnel suitable for island and reef environments, comprising an inner tunnel, an outer tunnel, a microplastic composite (MICP) impermeable body, an adaptive composite damping device, a sensing device, a control device, and a power supply device. The outer tunnel and the inner tunnel are coaxially arranged to form a vacuum cavity. An array of adaptive composite damping devices is disposed within the vacuum cavity and connected between the inner and outer tunnels for structural adjustment when the tunnel deforms. The MIP impermeable body surrounds the outer tunnel, reinforcing the surrounding foundation for seepage prevention. The sensing device detects structural deformation of the tunnel, and the control device controls the adaptive composite damping device to generate reset deformation based on the structural deformation. A thermoelectric power generation assembly provides power to various electrical devices. The integrated utility tunnel of this application can simultaneously achieve adaptive structural adjustment, foundation seepage prevention reinforcement, and energy self-sufficiency, significantly improving the structural stability, seepage prevention performance, and long-term operational reliability of the integrated utility tunnel in complex marine environments.

This utility model provides a busbar trunking based on integrated utility tunnel power distribution technology, belonging to the field of busbar trunking technology. It includes a support mechanism comprising a housing, several connectors fixedly installed on the surface of the housing, and support members fixedly installed inside the housing for limiting the arrangement of conductors; and a heat dissipation mechanism including heat dissipation components for dissipating heat from the inside of the housing and heat conduction components for dissipating heat generated by the conductors. The heat dissipation components include a heat conduction plate fixedly installed on the surface of the housing, several heat dissipation slots fixedly installed on the surface of the heat conduction plates, heat dissipation fins movably installed inside the heat dissipation slots, and several transmission blocks for driving the heat dissipation fins to rise and fall synchronously. This utility model, through the cooperation between the heat dissipation components and the heat conduction components, adjusts the heat dissipation efficiency of the conductors inside the housing, solving the problem that traditional busbar trunking cannot dissipate heat from conductors according to the actual temperature, thus achieving adjustable heat dissipation efficiency based on ambient temperature.

This invention relates to the field of pipe jacking construction technology, specifically to an advanced geological prediction method used in pipe jacking construction under complex strata. The method involves geological surveying of the pipe jacking tunnel area, conducting preliminary surveys of the soil, and determining whether there are significant differences in soil hardness based on soil physical parameters. If such differences exist, the structural topography and adverse geological features within the pipe jacking tunnel area need to be predicted. Monitoring point deployment involves installing geophones on the sidewalls of the pipes in the pipe jacking tunnel. In this invention, geophones are deployed in a spatial array on the sidewalls of the pipe jacking tunnel, allowing for flexible data acquisition and adjustment of geophone positions based on site conditions. A total of [number missing] monitoring points were deployed. The advantages are: the HSP advanced geological prediction technology proposed in this invention for geological surveying of pipe jacking tunnels is fast, essentially not taking up construction time; data analysis after signal processing is rapid, and preliminary conclusions can be drawn immediately after measurement.

This utility model discloses a fiber-reinforced composite concrete protective and airtight cover for underground utility tunnels, relating to the technical field of underground utility tunnel cover plates. It includes a cover plate support with a groove on its upper surface. A concrete cover plate body is placed inside the groove. The concrete cover plate body includes a protective frame, multiple transverse support ribs, multiple longitudinal support ribs, a heat insulation layer, a composite concrete layer, and an electromagnetic shielding layer. Each transverse support rib is horizontally fixedly connected to the inside of the protective frame, and each longitudinal support rib is vertically fixedly connected to the inside of the protective frame. This utility model uses high-strength steel for the protective frame, combined with a crisscrossing steel reinforcement skeleton (transverse and longitudinal support ribs), and then welds it to form a rigid frame. This effectively disperses the load generated by vehicle traffic or pedestrian trampling, preventing stress concentration that could lead to concrete cracking.

This invention provides a laser SLAM inspection vehicle and method suitable for complex underground infrastructure environments. A multi-line lidar system is equipped with multiple laser emission and reception channels to generate high-density, large-area 3D point cloud data. A high-precision inertial measurement unit (IMU) provides the system with high-frequency attitude, angular velocity, and acceleration information. A wheeled odometer collects wheel speed data to provide short-term pose increment information, effectively supplementing the lidar and IMU. An edge computing device performs real-time data processing using SLAM algorithms. An embedded motion control unit runs an operating system to precisely control the chassis motors and transmit data with various subsystems. The software framework is built on the operating system and includes distributed nodes, a publish / subscribe communication model, and an open-source toolkit ecosystem. This achieves lightweight 3D perception capabilities, strong anti-interference performance, and supports fully automatic online repositioning, making it suitable for use in underground infrastructure such as subway tunnels, urban utility tunnels, and large warehousing centers.

This invention relates to the field of intelligent operation and maintenance technology, and particularly to a method and system for anomaly identification in underground utility tunnels based on digital twins. The method includes the following steps: acquiring edge-sensing data; performing edge fusion on the edge-sensing data to obtain edge-fused data; extracting local anomaly spectra from the edge-fused data to obtain local anomaly spectrum data; performing ubiquitous heterogeneous characterization and global modal mapping on the local anomaly spectrum data to obtain global modal mapping data; identifying anomalies based on the local anomaly spectrum data and the global modal mapping data to obtain anomaly identification data; and making intelligent repair decisions based on the anomaly identification data to obtain intelligent repair decision data. This invention, through coupled analysis combining local anomaly spectra and global modal mapping, achieves the identification of anomalies from local perception to global propagation and source tracing, improving the accuracy and stability of anomaly detection. Linking the anomaly identification results with repair path planning achieves integrated closed-loop processing of identification and decision-making.

The present application relates to the field of fire fighting, and discloses a fire partition system and a comprehensive pipe gallery comprising the same, wherein the comprehensive pipe gallery comprises the fire partition system. The fire partition system comprises a fire door, a ventilation baffle, a ventilation system, a drainage baffle and a drainage system. The ventilation system comprises a ventilation hole, and the ventilation baffle and the ventilation hole are arranged correspondingly to the fire door. The ventilation baffle is matched with the ventilation hole, and the ventilation baffle does not cover the ventilation hole when the fire door is opened and can cover the ventilation hole after the fire door is closed. The drainage system comprises a drainage ditch, and the drainage baffle is matched with the drainage ditch. The drainage baffle is arranged correspondingly to the fire door, and the drainage baffle does not cut off the drainage ditch when the fire door is opened and can cut off the drainage ditch after the fire door is closed. The ventilation baffle is matched with the ventilation hole and can cover the ventilation hole. The ventilation baffle and the drainage baffle are arranged at the fire door to realize the fire partition and the connection.

The utility model provides a kind of exempt from formwork piece prefabricated comprehensive pipe gallery structure, including along longitudinal piece prefabricated side wall, middle wall, roof and bottom plate;The side wall top is equipped with cantilevered plate integrally formed with one, and the cantilevered plate is used to rest roof and as the template of wet connecting node;The side wall and roof, the side wall and bottom plate are connected by steel bar lap joint and post-poured concrete to form wet connecting structure;The middle wall and roof are connected by high-strength bolt to form dry connecting structure;The middle wall and bottom plate are connected by mortise and tenon structure to form dry connecting structure;The longitudinal end of the side wall, roof and bottom plate is equipped with the connecting box of built-in steel wire rope ring, and the corresponding steel wire rope ring of adjacent pipe gallery section is connected by pin shaft steel bar and forms longitudinal connecting structure by pouring concrete.The utility model has good economy, and multiple segments can also be parallel advanced during construction, and efficiency is stable.

This application discloses a method for proactive fire prevention in underground utility tunnels, relating to the field of cable fire monitoring technology. The method includes: acquiring composite physical field characteristic parameters of the target area, including temperature change rate, acoustic vibration signal characteristic values, and gas concentration values; generating a trigger signal when the temperature change rate, acoustic vibration signal characteristic values, or gas concentration values ​​reach preset critical values; responding to the trigger signal with an intervention action; acquiring feedback parameters after the intervention action, and determining whether to repeat the intervention action based on the feedback parameters. This application achieves accurate identification of the imminent thermal-electrical runaway critical state of cable joints through the above method, advancing the intervention time from post-disaster to pre-disaster, fundamentally blocking the path of fault evolution into fire.

This invention discloses a method for dynamic monitoring and control of the spatial environment in underground utility tunnels, relating to the field of urban infrastructure operation and maintenance technology. After sorting the tunnel segments, instead of applying the same control method directly to all abnormal segments, it continues to read the environmental monitoring items that contribute the most to the deviation in each segment. Combining the function type, function area, and cross-segment boundaries of existing actuators, it calculates the control mapping relationship between the tunnel segment and candidate actuators, and then selects the actuator that best matches the current dominant deviation state for each segment. Fans, drainage pumps, access control linkage programs, and ventilation zone switching programs are no longer simply called in fixed patterns, but are instead linked separately based on the dominant environmental problems of different tunnel segments. For common issues in underground utility tunnels such as gas migration, moisture diffusion, and water accumulation, this method enables the actuator to match the abnormal attributes and main chain relationships of the current tunnel segment.

This utility model belongs to the field of municipal construction technology, specifically relating to a waterproof connection structure for a prefabricated integrated pipe gallery joint. It includes a left pipe gallery, with a right pipe gallery connected to its right side. The left and right pipe galleries are the same size. A sleeve is fixedly connected to the right side of the left pipe gallery, and a slot is provided on the left side of the right pipe gallery. The sleeve slides into the slot, thereby raising and creating an inclined surface at the connection between the left and right inclined sleeves, preventing water from flowing through the inclined surface. Furthermore, a retaining cover is used to shield and wrap the upper end of the connection. Left and right sealing gaskets seal the lower end of the retaining cover, further enhancing waterproofing. A support sleeve is connected to the left and right support sleeves via left and right connecting ribs, respectively, providing internal support and reinforcement for the left and right pipe galleries, increasing the stability of the installation support and reducing the probability of collapse or denting.

The application discloses an underground comprehensive pipe gallery, which comprises a gallery body; a notch is arranged on the side wall of one side of the gallery body, the notch extends to the length of the gallery body along the length direction of the gallery, and the notch penetrates into the gallery body; a plurality of steel corbel assemblies are uniformly arranged on the outer wall of the gallery body at the notch along the length direction of the notch. The application further discloses a laying construction method of the underground comprehensive pipe gallery. In the application, the notch extending along the length direction of the gallery is arranged on one side of the gallery body, the notch can regularize the underground pipelines including the old pipelines on the outer side of the gallery into the gallery without interrupting the pipelines, and the influence on the nearby residents, communication and the like is reduced to the minimum on the premise of ensuring the construction progress of the gallery.

This utility model discloses a recessed waterstop positioning device, relating to the field of urban utility tunnel equipment technology. It includes a wooden box body, small square timber beams, and a large steel pipe beam. The wooden box body has an upper and lower layer, with the waterstop body positioned between the two layers. Small square timber beams are vertically positioned on the outer side of the wooden box body, and a large steel pipe beam is horizontally installed on the outer side of the small square timber beams. A butterfly-buckle tie rod runs through the wooden box body. Pre-drilled holes are provided on both the small square timber beams and the large steel pipe beam. A leveling wooden template is placed between the wooden box body and the waterstop body. This recessed waterstop positioning device, by covering the entire cross-section of the waterstop body with the wooden box body, changes the fixation from point contact to surface contact, reducing the problem of the waterstop body rotating around the contact point. The small square timber beams and the large steel pipe beam prevent the waterstop body from shifting outward, ensuring it is installed in place in one go and reducing repeated adjustments.

This invention discloses an integrated waterproofing and sealing construction system for the intersection nodes of municipal underground utility tunnels, belonging to the field of municipal engineering technology. It includes a base, a liquid storage tank fixedly connected to the right side of the upper surface of the base, a support block fixedly connected to the left side of the upper surface of the base, a pump fixedly connected to the upper surface of the liquid storage tank, a pumping pipe fixedly connected to the input end of the pump, and the output end of the pumping pipe extending into the interior of the liquid storage tank. A pipe clamping cavity is fixedly connected to the upper surface of the support block. This construction system achieves efficient utilization of waterproofing and sealing materials through multiple designs, significantly reducing construction costs and material waste. On one hand, the liquid storage tank is equipped with an integrated stirring and wall-mounting cleaning structure. A motor drives a rotating disk to move a rotating column and rod, causing the sliding vertical column to move up and down along the extension cavity. When the sliding block slides along the curved groove, it drives the stirring blades to rotate, continuously stirring the material.

This invention provides an intelligent monitoring method and system for underground utility tunnels based on multi-dimensional perception and fusion, belonging to the field of intelligent monitoring technology for urban underground utility tunnels. The method acquires multi-dimensional sensor data from the equipment layer at the tunnel site; generates spatiotemporally aligned environmental feature matrices, power feature matrices, control equipment feature matrices, and visual feature matrices; inputs a trained multimodal fusion model to obtain a high-dimensional unified spatiotemporal state vector and an attention weight matrix between the multi-dimensional sensor data; performs semantic parsing on the unified spatiotemporal state vector and the attention weight matrix between the multi-dimensional sensor data to identify anomalies, infer fault propagation chains, and generate linkage control suggestions; and executes control of the control equipment based on the linkage control suggestions. This method upgrades traditional single-point threshold alarms to panoramic correlation early warning, greatly improving the foresight, accuracy, and intelligence level of underground utility tunnel safety management.

This invention provides a spatial utility tunnel complex and its full life-cycle management method, belonging to the technical field of municipal engineering and campus infrastructure management. The piers are hollow cylindrical structures, with the bottom of the pier body rigidly connected to the pile foundation or abutment, and the top of the pier connected to the bottom of the box girder via rubber bearings. The box girder consists of a top plate, bottom plate, and side plates forming a box-cell structure. A pedestrian inspection passage is paved on one side of the box girder's top plate, and a machine inspection track is longitudinally arranged on the other side. Pipelines are layered on the side plates of the box girder from top to bottom. The internal cavity of the box girder is a dedicated compartment for low-voltage electrical cables, and the bottom forms a rainwater and sewage collection space with reserved vertical interfaces connecting to sewage wells. Vertical pipe channels are reserved inside the piers. This invention, employing the aforementioned spatial utility tunnel complex and its full life-cycle management method, solves the pain points of traditional underground pipe networks, such as unclear infrastructure, difficulty in emergency repairs, high renovation costs, significant construction interference, and insufficient intelligence.

This utility model discloses an anti-seismic and anti-detachment hook assembly for underground utility tunnels, specifically relating to the technical field of hook assembly components. It includes a first mounting base, a first movable platform on the outer side of the first mounting base, first limiting rods fixed to the front and rear ends of the first movable platform, a limiting frame fixed to the outer side of the first movable platform, a movable block for positioning the pipeline slidably connected to the inner side of the limiting frame, a second limiting rod on the outer side of the movable block, the second limiting rod slidably connected to the limiting frame, and a damper body installed on the inner side of the movable block. This utility model uses a first movable platform, first limiting rods, and limiting plates in conjunction with first and second sliding grooves to move multiple support plates, adjusting the orientation of the support plates. The first movable platform and limiting frame, in conjunction with first threaded rods and second limiting rods, drive the movable block and damper body to move, allowing the support plates to contact the utility tunnel pipeline. The damper body and support springs provide shock absorption, and multiple sets of support plates protect the pipeline.

This invention discloses a seismic isolation method for underground utility tunnels based on wave impedance matching using foamed lightweight soil. The method includes: S1 determining the performance parameters of the foamed lightweight soil based on the properties of the soil surrounding the underground utility tunnel, and delineating a foamed lightweight soil filling zone around the tunnel; S2 preparing foamed lightweight soil that meets the performance parameters and pouring it into the filling zone to form a continuous foamed lightweight soil filling zone enclosing the area below the tunnel's bottom slab, its sides, and above the top slab. The performance parameters of the foamed lightweight soil satisfy the wave impedance matching relationship, and the pouring thickness of the foamed lightweight soil isolation layer is determined according to a preset correspondence table. This invention is designed based on wave impedance matching theory, scientifically matching the dynamic mechanical characteristics of the isolation layer with the surrounding soil, maximizing the reflection and dissipation of vibration energy, and achieving a leap from empirical vibration reduction to theoretical vibration isolation. It is applicable to improving the seismic resistance and vibration isolation performance of various underground utility tunnels under complex geological conditions.

The utility model relates to the technical field of city infrastructure construction, and disclose a prefabricated assembly type city comprehensive pipe gallery, including device main part, one end of device main part is equipped with the inlay block that sticks, the outside of inlay block is equipped with device secondary block, and the one end of device secondary block is equipped with the inlay slot that sticks, and the top of device main part is equipped with waterproof top block, and the surface of waterproof top block is equipped with the water diversion groove that sets up, and the inside of device main part is close to the part of one end and is equipped with stable horizontal plate, and the upper and lower ends of stable horizontal plate all are equipped with the support inclined plate, and the inside of both ends of stable horizontal plate sets up stable insertion slot, and the surface both ends of stable horizontal plate all are equipped with stable knob, and the inside surface of device main part is equipped with pipeline fixed block, and the surface of pipeline fixed block sets up the storage groove, and the inside middle part of device main part is equipped with the partition vertical board, the utility model discloses through being equipped with device main part and pipeline fixed block and partition vertical board, and the classification installation work of pipeline and line of device is convenient for waterproof work, and is convenient for device.

This invention relates to a data communication method and system for underground utility tunnels based on LoRa relay, relating to the field of underground utility tunnel fault detection. The method includes: Step 100: A smart sensor collects fault data and retrieves a relay node; Step 101: A data relay command is generated and sent based on the fault data and the relay node; a repeater receives the data relay command and determines the relay number and relay data; Step 102: A relay number is determined according to the relay number; Step 103: A data relay command is generated and sent based on the relay number and relay data; a terminal receives the data relay command and determines the network address and relay data; Step 104: A network communication command is generated and sent based on the network address and relay data. This application improves the timeliness of underground utility tunnel fault detection and establishes a high-speed and stable data transmission channel within the underground utility tunnel.

This invention provides a rapid construction trolley, formwork, and construction method for underground utility tunnels. It includes an inner formwork trolley, whose inner formwork support is connected to a non-removable formwork via multiple adjustable connecting rods. Pre-embedded steel plates are embedded within the non-removable formwork and fixedly connected to multiple nuts. Nuts near the outer edge are connected to the adjustable connecting rods before pouring and to cable supports after pouring. Nuts near the inner edge are fixedly connected to the reinforcing steel bars of the truss. This invention improves construction efficiency by utilizing the non-removable formwork, saving time required for formwork erection and dismantling, and allowing for early dismantling of the inner formwork trolley, further enhancing construction efficiency. The pre-embedded steel plates and nuts within the non-removable formwork facilitate formwork erection, fixed installation of the reinforcing steel bars, and subsequent installation of cable supports, further improving construction efficiency. This invention significantly improves construction efficiency and saves labor, especially for the embedding of cable support components and subsequent cable support installation.

This invention provides a support construction method for bridge abutment construction in confined spaces, characterized by the following steps: S1, fabricating support piles, top supports, and walers in a factory and transporting them to the construction site; S2, after excavation of the foundation pit, driving the support piles; S3, hoisting the first and second formwork into the foundation pit; S4, aligning the second formwork with the slots of two adjacent portal frames and lowering it to the bottom; S5, fixing the first formwork with a vibratory hammer; S6, forming a support structure using the support piles, the first formwork, and the second formwork; S7, pouring the foundation within the support structure until it reaches the required strength; S8, disconnecting the connections, completing the dismantling, and finally removing the portal frames from the foundation pit. This invention avoids the need for simultaneous formwork and support during bridge abutment or urban utility tunnel construction, reducing the excavation area and construction steps, thereby improving construction efficiency and reducing construction costs.

A pipe gallery fire detector includes an upper housing and a base, with a sampling net positioned between the upper housing and the base. An air intake assembly is located within a containment space enclosed by the upper housing, base, and sampling net, allowing air to flow through the sampling net. The sampling net has a self-cleaning assembly for cleaning both sides. A smoke sensor is located within the containment space to measure smoke particles in the gas within the space. An exhaust unit is located on the base. This invention efficiently cleans the entire inner and outer surfaces of the sampling net. Compared to existing technologies that only clean one side, leading to secondary blockages caused by residue falling off the uncleaned side, this dual-sided simultaneous cleaning method fundamentally and thoroughly removes impurities from inside and outside the pores, significantly reducing the blockage rate and ensuring continuous and smooth airflow through the sampling net into the containment space. This maintains the accuracy and stability of the smoke sensor detection and greatly reduces the frequency of manual maintenance required due to blockages.

This invention discloses a method for early warning of electrical fires in urban underground utility tunnels, comprising: Step 1, collecting monitoring data for electrical fire early warning through sensing devices installed at key nodes of the underground utility tunnel; Step 2, preprocessing the monitoring data to obtain a standardized time-series dataset; Step 3, constructing a basic risk assessment model based on a Bayesian network and calculating the basic risk probability; Step 4, constructing a trend risk prediction model based on an LSTM neural network and performing model training and optimization; Step 5, concatenating the basic risk probability with the standardized time-series data and inputting it into the trained trend risk prediction model to output the trend risk probability; Step 6, weighted fusion of the basic risk probability and the trend risk probability to obtain the final fire prediction probability; Step 7, setting a risk probability grading threshold; determining the early warning level based on the final fire prediction probability and generating corresponding early warning information.