598 results about "Slurry wall" patented technology

The invention relates to a composite interactive water-rich stratum efficient grooving ultra-deep underground diaphragm wall and a construction method. The construction method comprises the following steps of cement mixing pile groove wall reinforcement, guide wall foundation steel pipe pile built-in, guide wall novel template system installation, soft soil layer grab bucket grooving, karst cave drilling and grouting, rotary digging drill rock breaking and karst cave backfilling and double-wheel milling groove milling. The method has the beneficial effects that the groove wall is reinforced by the cement mixing piles, so that the groove wall is prevented from collapsing; the assembled drainage device is adopted, so that the construction efficiency is improved; the steel pipe piles are connected with the guide wall, so that the stability of the guide wall is improved; the steel plate groove is used as a guide wall template, so that the template turnover rate is improved; the open type steel box is placed on the groove opening, so that the risk of collapse of the groove wall is reduced; gaps and holes are blocked through drilling and grouting, then guide holes are rotationally excavated, and the karst cave is backfilled with plain concrete, so that the construction problem of grooving at the karst cave is solved; through the cooperation of the steel casing hoisting and positioning device, the construction efficiency of the rotary excavating guide hole is improved.

The invention relates to the field of water conservancy project dams, in particular to a construction method of a dam composite flexible diaphragm wall. 2, equipment is in place; thirdly, wall forming is conducted through a construction method, and the equal-thickness cement soil underground continuous wall is formed; fourthly, the anti-seepage core plate is inserted; the anti-seepage core plate is composed of a body, a plurality of bundles of optical fibers are distributed inside or on the outer surface of the anti-seepage core plate, and the optical fibers extend downwards in the length direction of the body and can monitor environmental changes of the body and the underground diaphragm wall around the body. A continuous and uniform dam composite flexible anti-seepage wall can be formed for a winding dike, the erosion resistance and disturbance resistance of the anti-seepage wall can be improved, the anti-seepage durability is improved, meanwhile, whether a seepage area exists in the continuous wall or not is monitored through the anti-seepage core plate, and early warning is provided for effectively taking precautionary measures in time.

The invention relates to a foundation pit deformation control method and system based on dynamic load compensation, and belongs to the technical field of foundation pit supporting and computers. The foundation pit deformation control method based on dynamic load compensation comprises the steps that S1, a hydraulic supporting unit is arranged on the inner side of a foundation pit supporting pile or an underground diaphragm wall, the pressure of the hydraulic supporting unit and the displacement amount of the supporting pile or the underground diaphragm wall are monitored in real time, and the supporting force needing to be provided by the hydraulic supporting unit is calculated; s2, foundation pit soil strain data are monitored in real time, vehicle position, speed and load data are obtained, and a dynamic load distribution model is constructed; and S3, constructing a foundation pit deformation prediction model by using an LSTM neural network, and predicting the influence trend of vehicle passing on foundation pit deformation so as to adjust the supporting force of the supporting structure in advance and automatically optimize the vehicle path at the same time. According to the method, deformation is actively controlled through a dynamic compensation mechanism, construction safety and stability of surrounding facilities are guaranteed, and the method is particularly suitable for sensitive areas adjacent to underground facilities or important buildings.

The disclosure relates to a soil processing apparatus, in particular diaphragm wall cutter, for creating a trench, which apparatus is connectable to a work-performing machine, comprising a frame extending along a longitudinal axis, which has a rectangular cross-section transverse to the longitudinal axis, a soil processing tool arranged on a lower section of the frame, a clamping device with at least two clamping elements arranged on opposite sides of the frame, which are actively adjustable relative to the frame in order to press the clamping elements against inner walls of a trench, and a feed device for generating a feed force on the soil processing tool within a trench, by means of which the clamping elements and the frame can be actively adjusted relative to each other along the longitudinal axis.

The invention relates to the field of foundation pit enclosure, in particular to a foundation pit enclosure structure and a construction method thereof, the foundation pit enclosure structure adopts the technical scheme of H-shaped steel pile supporting, underground diaphragm wall enclosure, additional tie bar reinforcement, post-pouring concrete forming and anchor rod driving for reinforcement, and the construction method comprises the steps of measuring, paying off and pile fixing positions, hoisting cylindrical steel pipe pier columns and driving H-shaped steel piles; earthwork is excavated in a layered, segmented, interval-divided and module-divided mode, and residual soil on the pile side is cleaned; hoisting a reinforcement cage, adding a tie bar for perforation, and installing an anchoring plate; the profiled steel sheet is fixed, and an anchor rod sleeve is pre-embedded; correcting the additional rib plate, installing a corner profiled steel sheet and pre-burying an anchor rod sleeve; fine aggregate concrete is poured in a segmented mode, and the underground diaphragm wall is formed; strengthening maintenance, arranging anchor rods and fixing the anchor rods; and the steps are repeated until all building envelope construction is completed, and finally overall acceptance check is conducted. The structural design is innovated, and the process method is optimized.

The utility model discloses an underground diaphragm wall joint embedded freezing pipe water stop connector system which comprises a special-shaped water stop steel plate and an embedded reinforcement cage. The special-shaped water stop steel plate is fixed at the joint of the continuous wall, and the middle part of the special-shaped water stop steel plate is a main body steel plate with an X-shaped section; straight steel plates are arranged on the front side and the rear side of the main steel plate respectively and are perpendicular to the guide wall. L-shaped steel plates are arranged on the left side and the right side of the main steel plate respectively, L-shaped inner angles face the main steel plate, L-shaped edges of the left L-shaped steel plate and the right L-shaped steel plate are opposite, a gap is formed between the L-shaped edges of the left L-shaped steel plate and the right L-shaped steel plate, and groove bodies are formed between the left L-shaped steel plate and the main steel plate and between the right L-shaped steel plate and the main steel plate respectively. Reinforcement cages are arranged inside and outside the tank body, and freezing pipes are arranged in the reinforcement cages in the tank body. The reverse buckling structures are formed at the joints through the special-shaped water stop steel plates, the integrity between the underground diaphragm walls is enhanced, and the water stop effect is remarkably improved.

The invention discloses a low-clearance and close-range barrier removal construction method for an existing operation station enclosure structure, which comprises the following steps: S1, underground diaphragm wall construction: S11, underground diaphragm wall groove wall reinforcement: according to the stratum condition, in order to avoid hole collapse in the groove forming process, adopting MJS construction method piles for reinforcement treatment between a barrier removal working well and new and old ground walls of a station, and S12, construction of an underground diaphragm wall; grooving the underground diaphragm wall; s13, hoisting an underground diaphragm wall reinforcement cage; s14, concrete pouring is conducted; s2, crown beam supporting and dewatering well construction; s3, foundation pit excavation and support erection construction are carried out; s4, constructing a lining wall; s5, freezing construction is conducted; s6, barrier removal construction is carried out; and S7, backfilling construction is conducted. The problem that conventional construction cannot meet the construction requirements that the obstacle removing working well is located in a low clearance, adjacent to an operation subway line and a bridge pile and small in space of the obstacle removing working well is solved, obstacle removing work can be safely completed, and operation of the subway line and the viaduct cannot be affected.

The invention relates to the technical field of assembly type building engineering, in particular to a laminated side wall system for an underground station and a construction method of the laminated side wall system, the laminated side wall system comprises a single-face laminated side wall and a double-face laminated side wall, and the single-face laminated side wall or the double-face laminated side wall is selected for construction according to different construction conditions. The single-face laminated side wall is composed of an inner side prefabricated reinforced concrete laminated plate I and a cast-in-place layer I. The double-face laminated side wall is composed of an inner side prefabricated reinforced concrete laminated plate II, an outer side prefabricated reinforced concrete laminated plate and a cast-in-place layer II. When the underground diaphragm wall needs to be adopted for foundation pit supporting, the single-face overlapped side wall is adopted; when the underground diaphragm wall is not needed for foundation pit supporting, the double-face overlapped side wall is adopted. The superimposed side wall system for the underground station and the construction method thereof have the advantages of being high in adaptability, high in construction efficiency, good in connection performance, low in construction cost, convenient to transport and assemble, good in waterproof effect and the like, and are particularly suitable for the field of fabricated building engineering such as the underground station.

The utility model discloses a node connection of a prefabricated underground continuous wall and a cast-in-place composite wall, comprising a prefabricated underground continuous wall, the prefabricated underground continuous wall and the cast-in-place underground continuous wall are fixedly connected, a cast-in-place buttress column is cast inside the connection between the prefabricated underground continuous wall and the cast-in-place underground continuous wall, and a cast-in-place structural side wall is cast inside the cast-in-place underground continuous wall and at the side wall of the cast-in-place buttress column. The utility model adopts a cast-in-place underground continuous wall for support in irregular areas of underground engineering, utilizes the flexibility of the cast-in-place structure, avoids the use of all prefabricated components, and avoids the need to purchase multiple sets of special-shaped molds, which causes an increase in engineering costs. It combines cast-in-place with prefabrication according to local conditions, improves the construction efficiency of the underground engineering enclosure structure, speeds up the construction speed of the underground engineering, and optimizes the allocation of labor. The utility model ensures the strength, integrity, durability and waterproof effect of the node connection position during use.

The invention relates to a construction process for connecting a newly-built underground diaphragm wall with an existing underground diaphragm wall. The construction process comprises the following steps: surveying and mapping an elastic line; selecting a proper obstacle removing machine to perform vertical cutting along the snapping line; boundary invasion obstacles are removed; a newly-built underground diaphragm wall is constructed; and performing waterproof treatment on the joint. According to the construction technology for connecting the newly-built underground diaphragm wall with the existing underground diaphragm wall, the obstacle removing machine is used for removing boundary invasion obstacles such as original concrete bumps or mud cakes at the connecting position of the newly-built underground diaphragm wall and the existing underground diaphragm wall, and then construction of the newly-built underground diaphragm wall is completed; water-stop steel plates are installed and water-stop materials are injected at the joints, so that the seepage-proofing capacity of the joints of the newly-built underground diaphragm wall and the existing underground diaphragm wall can be improved, and water leakage of the joints of the new underground diaphragm wall and the old underground diaphragm wall in the foundation pit excavation process is prevented.

The invention relates to a construction technology for an underground diaphragm wall in a sensitive area. The construction technology comprises the following steps that S1, construction preparation is conducted, and a site is arranged; sa2, setting a slurry system; sb2, measuring and setting out; sa3, slurry is prepared; sb3, guide wall construction; sa4, storing the slurry; sb4, reinforcing the foundation; sa5, recycling and separating the slurry; sb5, grooving excavation and inspection are carried out; sa6, slurry regeneration is carried out; sb6, wall brushing and hole sweeping are conducted on the connector; sc1, manufacturing a reinforcement cage platform; sa7, slurry discarding is carried out; sb7, tank bottom treatment; sc2, manufacturing a steel bottom plate and a reinforcement cage; s8, hoisting the reinforcement cage; s9, hoisting the joint box; s10, a guide pipe is installed; s11, concrete pouring is conducted; s12, the connector box is pulled out; in Sb4, in foundation reinforcement, reinforcing holes are vertically punched downwards in one side of the guide wall at equal intervals, slurry is sprayed to the position under the guide wall in a covering mode in the reinforcing holes in the direction towards the guide wall in a 150-degree rotary spraying mode, and the depth of the reinforcing holes is larger than that of the underground continuous wall. Guniting reinforcement is conducted on the foundation before construction, the grooving quality is improved, and meanwhile the settlement risk is reduced.

A waterproof structure for a panel joint of an underground diaphragm wall includes a first waterstop and a first cover plate. The panel joint is provided with a wall connection plate. The underground diaphragm wall has an excavation surface. In a direction perpendicular to the excavation surface, the wall connection plate is arranged below the excavation surface of the underground diaphragm wall. A first accommodating groove is defined between the wall connection plate and the panel joint and adjacent to the excavation surface. The first waterstop is arranged in the first accommodating groove, and both wings of the first waterstop are respectively and adhesively bonded to the two sides of the panel joint. The first cover plate corresponds to the first accommodating groove and is arranged at the excavation surface. The first cover plate is detachably connected to the underground diaphragm wall.

The invention relates to an automatic in-situ specific gravity detection method for grooving slurry of an underground diaphragm wall, which comprises the following steps: connecting a pressure sensor with a lead and a data line to form a pressure detection belt, sinking the pressure detection belt into a groove section of the underground diaphragm wall, and detecting the pressure of slurry at different depths in the groove section after the pressure detection belt is stable. Slurry pressure data are collected at fixed time intervals and synchronously transmitted to a ground data collection system, according to the collected slurry pressure data, a curve that the slurry pressure changes along with the depth at different time is generated in real time, and finally the slurry specific gravity at different depths and the situation that the slurry specific gravity changes along with the time at the same depth position are obtained. According to the method, the traditional mode that slurry of different depths is collected through a slurry barrel and then the slurry of the groove section is manually detected on the ground is avoided, the specific gravity of the slurry of different depths in the groove section of the underground diaphragm wall is rapidly and conveniently obtained through an automatic in-situ detection means, the labor cost and the detection error are reduced, and the detection efficiency is improved.

The invention discloses a numerical simulation analysis method for a near-river ultra-deep foundation pit under the action of seepage flow, and the method comprises the following steps: S1, constructing a three-dimensional numerical model based on finite element software PLAXIS 3D, and constructing a non-uniform stratum model in combination with a Borehole module; s2, fine modeling is conducted through the underground diaphragm wall, the reinforced concrete supports and the latticed columns; s3, simulating a small strain hardening characteristic and a rigidity attenuation effect of the soil body by adopting an HSS model; s4, simulating underground water flow by combining plastic steady-state seepage analysis, and simplifying the three-axis cement mixing pile into an underground diaphragm wall structure through an equivalent stiffness principle; and S5, step-by-step excavation and support sequential control construction procedures are adopted, and finally, the reliability of the model is verified by comparing a horizontal displacement simulation result of the diaphragm wall with field monitoring data. According to the method, the foundation pit deformation rule is predicted through HSS constitutive model and seepage coupling analysis, and the foundation pit deformation prediction precision is remarkably improved.

The utility model discloses a permanent and temporary combined assembly type underground structure plate wall connecting node which comprises an assembly type underground diaphragm wall, a full-length steel plate is installed on the side wall of the assembly type underground diaphragm wall, and a prefabricated structure plate is hoisted on the full-length steel plate. The gap between the prefabricated structural slab and the fabricated underground diaphragm wall is filled with ultra-high-performance concrete, and a steel bar structure is arranged in the ultra-high-performance concrete. According to the utility model, the rigid connection between the two prefabricated parts is realized, the integrity of the structure is improved, and the safety and durability of the underground structure are fully ensured; an underground diaphragm wall which is usually used as a temporary structure is changed into a permanent structure, so that the construction period is shortened, and the investment is saved; the ultra-high performance concrete poured in the joint can greatly shorten the anchoring length of the steel bars, enlarge the arrangement distance of the steel bars, obviously reduce the using amount of the steel bars on site and the binding workload, is convenient to install and simple in process, obviously improves the construction efficiency, and has high popularization and application value.

The utility model provides an underground diaphragm wall retaining wall mud film detection test device under unfavorable geological conditions. The device comprises a rack; the multi-layer soil body model box is arranged at the lower part of the rack, and at least two soil body model boxes in the multi-layer soil body model box are different in soil texture; one end of the grooving simulation part is inserted into the bottom of the multi-layer soil body model box; the lifting component is arranged at the top of the rack, is connected with the grooving simulation component and is used for driving the grooving simulation component to lift; and each grouting pump is internally provided with slurry with different proportions, each layer of soil body model box is connected with one grouting pump through a grouting pipe, and the number of the grouting pumps is smaller than the number of layers of the multi-layer type soil body model box. According to the utility model, the multi-layer soil body model box and the plurality of slurry grouting pumps with different proportions are arranged, so that the quality of slurry under various unfavorable geological conditions or the quality of a mud film formed by various types of slurry and a soil body can be detected at the same time, and the film forming quality of the slurry and whether the slurry can become a screening standard of the mud film can be accurately grasped.

The invention relates to a method for automatically monitoring construction of an ultra-deep underground diaphragm wall in the whole process of a strong permeable stratum, and aims to solve the problems that the ultra-deep underground diaphragm wall in the strong permeable stratum is low in construction precision, easy to collapse, lack of real-time monitoring and the like. Five technical systems are used for synergistically solving the problems that (1) a lower suspended beam, a reserved post-cast strip and an inverted bracket structure are adopted in the blocking wall technical system, so that the impermeability is enhanced; (2) the detachable reinforcement cage supporting system improves rigidity and hoisting safety through modular truss supporting; (3) the verticality ultrasonic detection system realizes high-precision detection of the guide wall by using an ultrasonic signal; (4) the structural steel wall-attached inner bracket system prevents the guide wall from cracking through adjustable support; and (5) the automatic monitoring system integrates multiple sensors to monitor displacement and temperature in real time and performs cloud early warning. Through multi-technology fusion, the construction efficiency and quality are remarkably improved, and the method is suitable for ultra-deep underground diaphragm wall construction under complex geological conditions and has the advantages of being high in anti-permeability, controllable in deformation, capable of achieving real-time early warning and the like.

The invention discloses a pre-supporting structure and an installation method, the pre-supporting structure is formed by connecting a plurality of supports through vertical connecting rods and connecting nodes, and the installation elevation of the lowest support is lower than the bottom of a foundation pit; the enclosure structure is composed of an underground diaphragm wall, an outward protruding device, soft filler, a U-shaped steel plate and a stiffening plate, the outward protruding device is vertically fixed along the inner side of the underground diaphragm wall, the U-shaped steel plate and the stiffening plate are fixed to the end of the outward protruding device, and a groove of the U-shaped steel plate is filled with the soft filler; and the groove mechanism comprises a groove and a backfill material. According to the pre-supporting structure and the mounting method, a support can be mounted before earth excavation and precipitation, and horizontal counter force is applied to the enclosure structure, so that the effect of providing the support counter force first and then carrying out earth excavation is achieved, the sequence of earth excavation and support construction of the foundation pit is thoroughly changed, the support counter force can be provided for the part below the bottom of the foundation pit, and the construction efficiency is improved. And horizontal deformation of the foundation pit can be remarkably reduced, and environmental protection is facilitated.

The invention discloses a method for improving the quality of H-shaped steel joint concrete of an underground diaphragm wall, and belongs to the technical field of diaphragm wall construction, and the method comprises the following steps that vibrating equipment meeting the length within the range of 6 m from the ground to the excavation face of a foundation pit is customized, and the equipment length H is equal to the sum of the excavation depth of the foundation pit and 6 m; grooving and hole cleaning are conducted on the underground diaphragm wall according to the construction technology, and H-shaped steel and a reinforcement cage are hung and placed; a vibrator is lowered to the bottom of the foundation pit which is vertically placed close to one side of the H-shaped steel, and the distance h between the vibrator and the H-shaped steel is kept between 10 cm and 15 cm; and concrete pouring is started, when the concrete liquid level exceeds the top end of the vibrator, the concrete vibrator is started, and the vibrator and the concrete pouring guide pipe are lifted till concrete is poured to the top of the continuous wall. According to the method, while concrete is poured into the underground diaphragm wall, layered vibration is conducted on one side of the H-shaped steel through customized vibration equipment, the quality of concrete at the joint of the H-shaped steel of the underground diaphragm wall is improved, the later water leakage phenomenon is reduced, and the construction safety and reliability are improved.

The invention relates to the technical field of sediment treatment, and discloses a pile foundation slurry retaining wall sediment treatment device which comprises a thread adjusting type flushing mechanism and a screw type solid-liquid separation mechanism. A solid substance storage shell which is fixedly mounted at the top of the threaded pipeline and can store solid waste is arranged in the threaded pipeline; the hollow rotating shaft is mounted in the threaded pipeline and the solid substance storage shell in a rotatable manner; and the upper spiral blade and the lower spiral blade rotate along with the hollow rotating shaft and can enable a medium around the hollow rotating shaft to generate an upward flowing effect. According to the mud retaining wall sediment treatment device for the pile foundation, vertical impact treatment can be conducted on sediment, so that the sediment can rapidly move to the position near the spiral blade, the sediment collecting capacity is improved, in addition, the sludge and sediment waste collected subsequently can be collected in a separated mode, and the separating and collecting capacity of the device is improved.

The invention belongs to the technical field of building construction, and discloses a construction method of an underground diaphragm wall reinforcement cage, which comprises the following steps: hoisting a section of reinforcement cage to enable part of the reinforcement cage to extend into a ground wall groove section; a plurality of fixing pieces are arranged on the reinforcement cage in the lifting state in a penetrating mode, and the reinforcement cage is lowered so that the fixing pieces can be erected on the guide wall; whether the perpendicularity of the reinforcement cage erected on the guide wall meets the construction standard or not is judged; the main body structure is hoisted, and the fixing piece is pulled out of the reinforcement cage, so that part of the main body structure is exposed out of the ground wall groove section; a plurality of fixing pieces are arranged in the reinforcement cage located on the upper portion in a penetrating mode, and the main body structure is lowered so that the fixing pieces can be erected on the guide wall; and the third step to the fifth step are repeated till all the reinforcement cages are in butt joint and lowered into the ground wall groove section. Through the arrangement, the construction method of the underground diaphragm wall reinforcement cage solves the problem of perpendicularity deviation of the reinforcement cage, the construction precision and efficiency are improved, and the construction quality of an underground diaphragm wall is ensured.

The invention relates to the technical field of underground diaphragm wall construction equipment, in particular to a centrally-mounted slotting and stirring all-in-one machine which comprises two gantry stand column assemblies, a box-type rail chain cutter assembly, a platform support and a crawler chassis assembly, the length of the gantry stand column assemblies can be increased or decreased in the vertical direction, and the two gantry stand column assemblies are arranged in a left-right spaced mode; the box type rail chain cutter assembly is arranged between the two gantry stand column assemblies. The box type rail chain cutter assembly is located in the middle of the two gantry stand column assemblies, compared with a traditional box type rail chain cutter assembly which is arranged in an offset mode, the grounding specific pressure can be remarkably reduced, stress on the two sides of the cutting groove is balanced, and the situation that due to stress unbalance of the two sides of the cutting groove, a foundation collapses is avoided. Compared with a box-type rail chain cutter assembly which is arranged in an offset mode, the equipment has the lower requirement for the bearing capacity of a foundation during construction operation, and the equipment can be suitable for working environments such as reservoirs and dams with the small soil bearing capacity.

The invention discloses a grouting method for gaps of a groove wall of an assembly type diaphragm wall. The grouting method comprises the following steps that a first wall bottom grouting pipe and a second wall bottom grouting pipe are reserved in a wall body unit of the diaphragm wall; a plurality of wall side grouting pipes are tightly attached to the two sides of the underground diaphragm wall body units; an underground diaphragm wall body unit is assembled, and wall bottom grouting of the underground diaphragm wall body unit is carried out; grouting the groove walls of the wall body units of the upper underground diaphragm wall; grouting film bags are placed, and symmetrical groove wall grouting is conducted; and grouting of the inter-width grooves and the C / T joints is carried out. The waterproof performance and durability are improved, the direct influence of bad water and soil environments on the fabricated underground diaphragm wall is prevented, and the service life of an underground structure is prolonged. The structural stability is enhanced, the gap of the groove wall is filled, so that the fabricated underground diaphragm wall and surrounding soil can be more effectively combined, the overall stability and bearing capacity of the structure are improved, and the structural problems caused by loosening or uneven settlement of the soil are reduced.

The utility model discloses a post-grouting anti-seepage device for an underground diaphragm wall, which comprises a grouting steel pipe welded at a corner of an I-shaped steel joint of the underground diaphragm wall. The grouting steel pipe comprises a seamless steel pipe, a grout outlet steel pipe and a sealing iron sheet, and the seamless steel pipe is a main body of the grouting steel pipe and forms a grouting main channel; the slurry outlet steel pipe is a branch pipe welded on the seamless steel pipe at a certain interval to form a slurry outlet; and the sealing iron sheet covers the outer side of the slurry outlet steel pipe through spot welding. The grouting steel pipes are pre-buried at the corners of the I-shaped steel, post-grouting is carried out after concrete pouring of the underground diaphragm wall is completed, and through mud joints which are not cleaned up in the I-shaped steel joints are blocked. The construction method is easy to operate, low in manufacturing cost, low in requirement for a construction site, high in reliability and good in grouting, water stopping, seepage preventing and leaking stoppage effects, the waterproofness of the I-shaped steel joint of the underground diaphragm wall can be effectively improved, and a powerful guarantee is provided for the safety of foundation pit construction.

The invention discloses a risk control method for the influence of foundation pit dewatering excavation on an adjacent subway tunnel, and the method comprises the steps: constructing a three-dimensional fluid-solid coupling model which comprises an underground diaphragm wall, a supporting system and a subway tunnel; the rainfall excavation process is simulated step by step, and the tunnel displacement risk is evaluated; and risk control is carried out by optimizing a precipitation scheme, improving an excavation time sequence and strengthening monitoring feedback. According to the method, the three-dimensional fluid-solid coupling model is established, dynamic monitoring data feedback is combined, the comprehensive influence of bilateral foundation pit dewatering excavation on the subway tunnel is comprehensively evaluated, the evaluation precision and real-time performance are improved, and construction safety and subway operation stability are ensured.

The utility model discloses a prefabricated underground diaphragm wall inter-breadth segmental connecting piece which comprises an omega-shaped inter-breadth connecting piece and a T-shaped inter-breadth connecting piece, the omega-shaped inter-breadth connecting piece is arranged in a groove of the Nth prefabricated underground diaphragm wall, and an opening of the omega-shaped inter-breadth connecting piece faces the (N + 1) th prefabricated underground diaphragm wall. The T-shaped inter-width connecting piece is arranged in the tenon of the (N + 1) th prefabricated underground diaphragm wall, the omega-shaped inter-width connecting piece and the T-shaped inter-width connecting piece are used for inter-width connection, and inter-width cold joints are formed between the adjacent prefabricated underground diaphragm walls and between the omega-shaped inter-width connecting piece and the T-shaped inter-width connecting piece. The web plate of the T-shaped inter-width connecting piece perpendicularly stretches across the inter-width cold seam, then a permanent water stop steel plate is formed between the adjacent prefabricated underground diaphragm walls, and after anti-corrosion treatment, the waterproof and durability requirements of the inter-width seam water stop steel plate within the permanent service life period can be met. High-precision, high-efficiency and high-quality assembly of the prefabricated underground diaphragm wall is achieved.

The invention relates to a deep-buried pebble bed underground diaphragm wall, a construction method and a deep-buried pebble bed underground diaphragm wall construction system. The deep-buried pebble bed underground diaphragm wall construction system comprises an H-shaped steel combined anti-streaming device, a detachable composite cleaning scraper steel plate device and a rapid mud parameter measuring device. The H-shaped steel combined anti-streaming device has the beneficial effects that the H-shaped steel combined anti-streaming device is adopted, when the side wall of the groove section collapses, the expansion rubber bag is tightly attached to the side wall of the groove section and the multi-path multi-angle dip angle plate, a concrete streaming channel is blocked, and construction safety is guaranteed; the detachable composite cleaning scraper steel plate device is adopted, sundries such as concrete adhered in the I-shaped steel joint are cleaned through the scraper, the sundries are collected into the sundries collecting box in a centralized mode through the cleaning brush, the defects of mud inclusion, slag inclusion, water leakage and the like in the follow-up process are avoided, and the construction quality is guaranteed.

The utility model discloses a prefabricated part assembly structure applied underground and an underground diaphragm wall, which comprise a vertical prefabricated part, more than one first anti-shearing part used for external connection, more than one connecting steel bar used for external connection and more than one second anti-shearing part used for external connection, at least part of the connecting steel bars are located above and / or below the first shear-resistant piece. One end of the transverse prefabricated part is away from the vertical prefabricated part by a preset length, and more than one second shear-resistant part is embedded in the transverse prefabricated part; wherein the first anti-shearing piece is connected with the second anti-shearing piece, and the connecting steel bar is connected with a main bar of the transverse prefabricated component through a connecting assembly; a first cast-in-place area is arranged between the transverse prefabricated part and the vertical prefabricated part, and the pre-buried depth of the first shear-resistant part and / or the second shear-resistant part is larger than the outward extending length. According to the utility model, the assembly rate is improved, and the construction period is shortened; the first anti-shearing piece, the second anti-shearing piece and the connecting assembly are connected, and the first cast-in-place area is arranged, so that the connecting stability is ensured.

The invention relates to the technical field of civil engineering monitoring and evaluation, and provides a comprehensive pipe gallery underground diaphragm wall external soil pressure data evaluation method and system, and the method comprises the steps: analyzing and recognizing a specific mechanical response region of a comprehensive pipe gallery underground diaphragm wall; aiming at a specific mechanical response area, establishing a mechanical correction rule; acquiring monitoring data of a soil pressure sensor, and calculating an initial soil pressure predicted value of a measuring point position corresponding to the monitoring data according to a classic soil pressure theory; according to the position of the measuring point, whether the measuring point is located in a specific mechanical response area or not is judged, the initial soil pressure predicted value is adjusted based on a mechanical correction rule, and a corrected soil pressure predicted value is obtained; and comparing the monitoring data with the corrected soil pressure predicted value to obtain a numerical comparison result, and judging whether the monitoring data is abnormal or not according to the numerical comparison result. The method has the effect of improving the safety of long-term operation of the comprehensive pipe gallery.

The invention discloses a construction method for an ultra-wide underground diaphragm wall of a subway station. The construction method comprises the steps of construction preparation, surveying and lofting, guide wall manufacturing, grooving excavation, groove cleaning and slurry changing, reinforcement cage manufacturing and hoisting, concrete pouring, quality detection and the like. The construction method for the ultra-wide underground diaphragm wall of the subway station is suitable for construction of the underground diaphragm wall with the groove width of 9 m under the complex geological condition of a reclamation area, the efficiency is improved by adjusting the length of the groove width unit of the underground diaphragm wall, increasing groove wall reinforcement and forming grooves through combination of different devices, and truss ribs and I-shaped steel joints are optimized; it is ensured that the integrity, the anti-seepage function and the hoisting safety of the underground diaphragm wall meet the design requirements; and meanwhile, the hoisting in-place requirement of the prefabricated parts of the laminated assembly type subway station can be met.