474 results about "Slurry wall" patented technology

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.

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 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 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 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 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.

The invention relates to the technical field of image analysis, in particular to a health management system for the real-time safety state of a foundation pit supporting structure, and the system comprises a three-dimensional scene point cloud construction module which synchronously collects left and right camera images and preset camera parameters, calculates the parallax value of each pixel, and transmits the parallax value to a display module; and according to the parallax value of each pixel, the pixel coordinate and the internal and external parameters of the camera. According to the method, pixel-level parallax extraction and camera parameters are combined, the three-dimensional space coordinates of the underground diaphragm wall are calculated, spatial reconstruction of high-density point locations on the surface of the structure is achieved, a reference form capable of being tracked quantitatively is constructed, and corresponding point iterative registration and normal offset analysis are introduced, so that the accuracy of the method is improved. A real deformation track of a wall body can be extracted from tiny deformation, a deviation value set which is highly coupled with a structure state is constructed, a pixel point extraction strategy aiming at anchor rod wall construction characteristics is adopted at a node level, and real space coordinates of constructed nodes are locked.

The invention relates to a device and method for a jet flow coordinated heading machine to penetrate through an underground diaphragm wall, the device for the jet flow coordinated heading machine to penetrate through the underground diaphragm wall comprises a cutter head, a cutter head cutter and a telescopic spray head, the cutter head cutter is arranged on the cutter head, the cutter head is provided with a telescopic hole position used for installing the telescopic spray head, and the axis of the telescopic hole position extends in the front-back direction; a reciprocating driving mechanism is installed in the telescopic hole site and used for driving the telescopic nozzle to stretch and retract front and back along the telescopic hole site. The telescopic nozzle can realize advanced rapid cutting of a front reinforcing steel bar structure, so that stirring and aggregation of reinforcing steel bars during rotary cutting of the cutterhead cutter are avoided, the cutting length of the reinforcing steel bars is reduced, and smooth deslagging of a spiral conveyor of the tunnel boring machine is facilitated; the technical problems that steel bars are difficult to cut and the cutting length of the steel bars is large in the process that an existing tunnel boring machine penetrates through an underground diaphragm wall are solved.

The present application relates to underground excavation construction technical field, specifically for the underground continuous wall excavation of existing station close to the barrier scaffold and construction method, including frame, the upper part of frame is equipped with two walkway board, the front side of frame is provided with dense mesh, the left and right sides of walkway board are both provided with two installation slot, the inner wall of installation slot is inserted with installation block, the front and back sides of installation block are both installed with sliding block, the beneficial effect is: through adopting MJS horizontal reinforcement technology, and five steps three steps method is carried out to break the hole door, realizes the quick, safe, low cost hole door breaking work, not only speeds up the construction progress, but also reduces the construction risk, simultaneously in the process of erecting scaffold, through the synergistic cooperation between hook, lower hook piece and rubber pad, thereby effectively reduces the possibility of walkway board sliding on frame, further enhances the stability of walkway board installation, and can also improve the use effect of scaffold.

The utility model relates to the technical field of groove wall reinforcing construction, in particular to a double-wheel stirring drilling machine which comprises an engineering vehicle and a drilling machine base, a machine frame is arranged on one side of the drilling machine base, a drilling rod is arranged on one side of the machine frame, a lifting machine corresponding to the drilling rod is arranged on the machine frame, a groove milling machine is arranged at the bottom of the drilling rod, and an inclinometer is arranged on the groove milling machine. At least two groups of milling wheels are arranged on the slot milling machine; the bottom of the rack is hinged to the drilling machine base, a connecting frame is arranged on one side of the middle of the rack, a stabilizing rod is arranged between the connecting frame and the drilling machine base, a steel cable is connected to the top end of the drilling rod, and a winch is arranged on one side of the engineering truck. According to the utility model, the milling wheel is used for forming a cement-soil mixing pile with a rectangular groove section in a horizontal axial rotary mixing manner, and a single-shaft or multi-shaft mixing drilling tool is replaced to vertically rotate, so that a cylindrical cement-soil mixing pile is formed, and a wavy surface is prevented from appearing after an underground continuous wall is poured and formed.

The utility model discloses an underground diaphragm wall joint sand bag bagging device which comprises a supporting mechanism, a feeding device is installed on the upper side of the supporting mechanism, the feeding device comprises a loading funnel, a first conveying device is installed on the portion, located on the lower side of the feeding device, of the supporting mechanism, and a second conveying device is installed on the lower side of the loading funnel. A bagging device is installed at the discharging end of the first conveying device, a control device is installed on the portion, located on one side of the first conveying device, of the supporting mechanism, and a metering device with a built-in weighing sensor is installed on the lower side of the bagging device. The automatic assembly line device has the advantages that the metering device, the bagging device and the sealing device are combined and linked through the control device, the automatic assembly line device integrating weighing, bagging and sealing is formed, finished products are conveyed into the loading machine through the conveying belt after bagging and sealing are completed, the filling efficiency of underground diaphragm wall connector sand bags is improved, and the labor intensity of workers is reduced. And cost is saved, construction quality is guaranteed, and meanwhile filling convenience and safety of the underground diaphragm wall connector sand bags are guaranteed.

The application provides a deep foundation pit underground continuous wall seepage repair auxiliary device, and belongs to the technical field of deep foundation pit construction, and is used for assisting in repairing the underground continuous wall body with seepage phenomenon. Since there are many uncertain factors in the construction process of the underground continuous wall and the deep foundation pit, the local seepage of the underground continuous wall may occur in the process of foundation pit excavation or after the completion of excavation. When the wall body is repaired, it is required to drill into the underground continuous wall body obliquely, and the skill level of the operator is extremely high. The seepage repair auxiliary device comprises a base, a rotating part, an extension part and a plurality of drilling parts. The extension part comprises a power assembly and a guide assembly, the drilling parts are correspondingly installed in the guide assembly, under the joint action of the guide assembly and the power assembly, the plurality of drilling parts can simultaneously drill into the seepage area of the underground continuous wall, and the drilling direction can be oblique, so that the skill requirement of the operator is reduced, the drilling quality is improved, and the seepage repair efficiency is also improved.

This application relates to the technical field of building construction, and in particular to a waterproof structure for diaphragm walls. It includes a wall body consisting of multiple diaphragm walls pre-cast on the sidewalls of a foundation pit, and a sealing assembly for sealing the joints between adjacent wall sections. The sealing assembly includes a connector disposed between the two adjacent wall sections. The connector includes a web plate disposed between the end faces of the two adjacent wall sections and a pair of symmetrically arranged flanges on both sides of the web plate. The web plate is perpendicular to the flanges, and the flanges are located on both sides of the joint between the two adjacent wall sections and are abutted against the sides of the wall. The web plate and the flanges form a pair of mounting grooves for installing the wall ends. Precast reinforcing bars are provided on the end faces of the two adjacent wall sections facing the web plate. The web plate is welded to the reinforcing bars, and mortar for connection with the wall can be poured into the mounting grooves. This application improves the sealing effect at the joints of diaphragm walls and prevents leakage problems.

The invention provides a mechanical obstacle removing method and system for a shield crossing section steel joint underground diaphragm wall. The method comprises the following steps: firstly, determining a wall section to be subjected to obstacle removing and a section steel joint in a shield crossing range; then, a vertical drill hole is formed in the position, away from one side of the foundation pit, of the underground diaphragm wall, an all-casing full-slewing drilling machine is adopted for conducting segmented drilling on wall concrete and profile steel joints in the wall concrete, segmented cutting and taking out are conducted, and the vertical obstacle removing hole is backfilled; a horizontal or nearly horizontal drill hole is formed in the position, close to one side of the foundation pit, of the underground diaphragm wall, a horizontal diamond drilling machine is adopted for cutting and taking out the profile steel connector within the range of the shield tunnel portal, and a horizontal obstacle removing hole is blocked or backfilled; and finally, shield tunneling machine crossing construction is implemented. According to the method, the obstacle removing target is clear, side-by-side mechanical obstacle removing of the underground diaphragm wall with the section steel joints can be achieved under the conditions that a large-diameter obstacle removing well is not constructed and underground excavation manual obstacle removing is not carried out, and the method is verified through indoor and field tests and is suitable for being used in subway station crossing projects with limited fields.

This invention discloses a pre-positioned steel support system suitable for small, ultra-deep foundation pits, comprising several lattice columns, several connecting devices, pre-positioned steel supports, several steel strands, several through-hole jacks, several servo cylinders, and a hydraulic system. The pre-positioned steel supports include a steel waler and several corner horizontal braces set at the four corners of the steel waler. Several servo cylinders are spaced along the circumference of the steel waler on its outer surface. The servo cylinders extend and retract under the action of the hydraulic system to achieve active deformation control of the diaphragm wall. Several through-hole jacks, under the action of the hydraulic system, simultaneously raise and lower the pre-positioned steel supports by synchronously extending and retracting the corresponding steel strands. This invention enables a construction method of pre-positioning concrete or steel supports for simultaneous excavation, lowering, and support, effectively shortening the construction period and reducing the time without support during over-excavation. It has advantages such as high mechanization, strong construction safety, and high turnover rate.

The present invention relates to the field of water conservancy project dams, and in particular to a construction method for a composite flexible anti-seepage wall for dams, comprising: step one, measurement and positioning; step two, equipment placement; step three, wall construction, forming a continuous cement-soil underground wall of equal thickness; step four, inserting an anti-seepage core plate; the anti-seepage core plate is composed of a main body, and a plurality of optical fiber bundles are distributed on the interior or outer surface of the main body. These optical fibers extend downward along the length of the main body and can monitor environmental changes of the main body and the surrounding underground continuous wall. For winding dams, a continuous and uniform composite flexible anti-seepage wall for dams can be formed, and the anti-erosion and anti-disturbance capabilities of the anti-seepage wall can be improved, and the anti-seepage durability can be improved. At the same time, the continuous wall can be monitored for leakage areas through the anti-seepage core plate, providing early warning for timely and effective preventive measures.

According to the underground diaphragm wall leaking stoppage device and the using method thereof, the problems that the leaking stoppage construction period is long and the leaking stoppage effect is poor due to the fact that an existing mode for detecting leaking points of an underground diaphragm wall is low in efficiency and poor in precision are solved. The device comprises a leaking stoppage material bag connected to an underground diaphragm wall reinforcement cage, a hydraulic promotion bag arranged in the leaking stoppage material bag, and a positioning device and a detection assembly which are fixed to the outer wall of the leaking stoppage material bag and are in signal connection with a rear-end processing platform. The using method comprises the steps that the multiple underground diaphragm wall leaking stoppage devices are installed on a reinforcement cage, the detection assembly monitors whether water seepage exists in an underground diaphragm wall or not in real time and transmits monitoring data to the rear-end processing platform, when a detection result is abnormal, accurate positioning and depth detection are conducted on a leakage area through the positioning device, and three-dimensional coordinates are generated; and the rear-end processing platform controls the hydraulic promotion bag to be punctured, liquid in the hydraulic promotion bag makes contact with the leaking stoppage material to form grouting liquid, and the grouting liquid flows out of the leaking stoppage material bag and fills the leakage area.

The invention discloses a river-facing deep foundation pit composite supporting structure, a foundation pit comprises a river-facing side, the composite supporting structure comprises an enclosure structure and an inner supporting structure, the enclosure structure comprises an underground diaphragm wall, the inner supporting structure comprises latticed columns and a plurality of supporting beams arranged in the vertical direction of the latticed columns, and the latticed columns are arranged on the side of the foundation pit. The bottoms of the latticed columns are fixed to the supporting piles, the supporting piles are arranged along the supporting beams at intervals, and the lengths of the supporting piles are distributed from long to short in a stepped mode from the side away from the river-facing side to the river-facing side. The supporting beams act on the latticed columns, the latticed columns are fixed to the supporting piles, the supporting piles are arranged in a step shape according to the distance between the supporting piles and the river facing side and the length of the supporting piles, unbalanced pressure is dispersed to the corresponding latticed columns, and deformation of the enclosure structure is reduced.

The utility model relates to a vertical hole grinding drill for replacing large-aperture coring in an obstacle breaking area of an underground diaphragm wall, and solves the problems that the underground diaphragm wall is of a high-strength reinforced concrete structure, the drilling diameter is large, the drilling depth is large, and a traditional coring drill bit is insufficient in transmission torque in the process of drilling a construction hole in the underground diaphragm wall. The device comprises a drill bit, a drill rod is connected to the upper portion of the drill bit, the drill bit comprises a connecting section, a sleeve section and a grinding section from top to bottom, a grinding disc is arranged at the bottom of the grinding section, annular teeth are arranged on the circumference of the bottom face of the grinding disc, a plurality of grinding heads are distributed in the middle of the bottom face of the grinding disc, and water injection holes are formed in the positions, at gaps of the grinding heads, of the bottom face of the grinding disc. And an overflow slurry discharging channel is formed between the outer wall of the drill bit and the drill hole. The grinding head is arranged on the grinding disc on the bottom surface of the drill bit and is matched with an annular tooth structure of an original coring sleeve to grind the bottom surface of a drill hole and slowly push the drill hole, so that the drilling construction requirements of large-depth and high-strength materials are met.

The application provides a scalable assembled underground continuous wall, which comprises a recycled part and an embedded part arranged along the depth direction of a trench, the embedded part is below the recycled part and is connected with the recycled part, the recycled part is provided with at least two wall blocks which are detachably connected along the depth direction of the trench, the wall block comprises a block main body, a pressure bearing panel, an expansion shaft and a motor, the pressure bearing panel is arranged on both sides of the block main body close to the soil body, the pressure bearing panel is connected with the motor through the expansion shaft, the motor drives the expansion shaft to expand or contract along the width direction of the trench, and the expansion shaft drives the width position of the pressure bearing panel to change. The application can solve the instability problem of the underground continuous wall during support and can improve the recycling benefit of the wall block. The application further provides a construction method of the scalable assembled underground continuous wall.

The invention discloses a reverse construction method for a pile foundation. The reverse construction method comprises the following steps that firstly, a three-shaft stirring pile and an underground diaphragm wall are constructed; secondly, integrated construction of the engineering piles and the reverse construction supporting columns is carried out; thirdly, structural beams and structural plates of the first layer of the tower projection area are constructed, and unearthing is conducted on a non-tower projection area; fourthly, upper-layer structures continue to be constructed layer by layer upwards in the tower projection area, structural beams and structural slabs of the negative first layer are completed at the same time, and first-layer beam slabs of a non-tower area are constructed; fifthly, the area between the continuous walls continues to be unearthed downwards, and a bottom plate bearing platform, an anchor rod and a bottom plate of the underground bottommost layer are constructed to complete bottom sealing; and sixthly, construction continues to be conducted upwards in the tower projection area till the top of the tower is sealed, and structural construction from the negative second floor to the bottommost floor continues to be completed layer by layer according to the construction mode of the negative first floor. By means of the method, the engineering piles and the reverse supporting columns are integrally constructed, then protruding bottom sealing is achieved, the working procedure can be simplified, and the construction efficiency can be improved.

The utility model provides an ultra-long tunnel bottom plate construction joint waterproof device which comprises a first geosynthetic clay liner and a second geosynthetic clay liner, the first geosynthetic clay liner is laid between an underground diaphragm wall and a cushion layer, and the second geosynthetic clay liner is laid between the underground diaphragm wall and the cushion layer. The second geosynthetic clay liner is arranged at the top of the first geosynthetic clay liner and located among the underground diaphragm wall, the cushion layer and the foundation slab, and connecting mechanisms are arranged at the bent positions of the first geosynthetic clay liner and the second geosynthetic clay liner. Compared with the prior art, the geosynthetic clay liner has the advantages that through the design of the connecting mechanism, the angle between the supporting plate and the side plate on the connecting mechanism can be adjusted, and therefore the bending angle of the geosynthetic clay liner is matched with the construction angle while the geosynthetic clay liner is supported by the supporting plate and the side plate.

The invention provides a long-distance horizontal freezing hole structure capable of passing through underground obstacles and a construction method of the long-distance horizontal freezing hole structure, and provides a matched horizontal freezing hole structure and a construction method of the matched horizontal freezing hole structure aiming at a poor stratum of a water-rich sand layer and a construction pain point of a newly-built tunnel passing through an existing station. A special drilling tool is used for penetrating through obstacles such as an underground diaphragm wall and a cast-in-place pile, large-diameter freezing pipes are adopted for screw thread welding connection, and the freezing pipes are constructed in a two-way mode to be arranged in a lap-joint staggered-layer mode and supplemented with retesting and deviation rectifying. The problems of long-distance hole forming deflection, high construction risk, poor frozen body forming and the like are solved, it is guaranteed that the frozen hole smoothly penetrates through obstacles, the frozen wall is accurately crossed and formed, a safe space is provided for manual obstacle removing work, and meanwhile the construction requirements of similar horizontal drilling engineering are met.