243 results about "Dynamic compaction" patented technology

The invention relates to the technical field of foundation treatment, in particular to a dynamic compaction construction parameter optimization method based on XGBoost-PSO, and the method comprises the steps: obtaining a plurality of groups of compaction settlement data through a compaction test; the method comprises the following steps: selecting original features from actual measurement parameters of a test, constructing interactive features by adopting the actual measurement parameters, selecting optimal interactive features according to the importance ranking of XGboost features, and analyzing the correlation between the features; based on the feature set obtained through screening, a compaction settlement prediction model is established; and performing dynamic compaction parameter optimization on the compaction settlement prediction model by using a particle swarm algorithm to finally obtain an optimal compaction parameter combination. According to the method, the tamping parameters are automatically searched and optimized on the premise that the tamping stopping standard is met by building the tamping settlement prediction model, and therefore the purposes of guaranteeing the construction quality, improving the construction efficiency and reducing the construction cost are achieved; the method is suitable for various foundation construction design stages needing dynamic compaction treatment, and has good engineering adaptability and popularization value.

The invention provides a roadbed dynamic compaction construction quality control method and system based on rammer dynamic response. The control method comprises the following steps that an acceleration signal of a rammer in the current ramming process is obtained; data processing is carried out on the acceleration signal of the rammer, a plurality of key parameters used for predicting the dynamic deformation modulus are obtained, and the data processing comprises filtering processing, time domain analysis and frequency domain analysis which are carried out in sequence; on the basis of the multiple key parameters and a predetermined dynamic deformation modulus prediction model, the dynamic deformation modulus of the tamping point completing the current time of tamping is obtained; and comparing the dynamic deformation modulus of the tamping point with a set dynamic deformation modulus design value, and sending a tamping stopping prompt or a tamping continuing prompt based on a comparison result. According to the control method provided by the invention, the dynamic compaction construction is subjected to quality control based on the acceleration signal obtained in real time and the dynamic deformation modulus prediction model, so that the uniform compaction of the roadbed is ensured, and the construction efficiency and the construction quality are improved.

The invention discloses a bridge deck system multi-sub-project integrated construction process optimization method. The method comprises the following steps: step 1, optimizing a process based on a BIM (Building Information Modeling); step 2, carrying out combined measurement by adopting GNSS-RTK and laser scanning; 3, bridge deck pavement construction and expansion joint installation are conducted on the basis of the combined measurement result; 4, the paver is linked with the reserved groove for positioning, the flatness error can be effectively controlled, and the bridge deck pavement quality is guaranteed; 5, guardrail modular construction is carried out; sixthly, seamless connection, layered backfilling and dynamic compaction are conducted on the butt strap behind the abutment; 7, whole-process environmental protection and finished product protection; 8, performing three-dimensional scanning comparison; step 9, block chain data archiving; the method has the beneficial effects that construction simulation, sequence adjustment and dynamic monitoring are carried out based on the model optimization process logic, the problems of process crossing and construction period conflict can be recognized and eliminated by simulating the construction process in advance, accurate positioning of each subentry project is ensured, and the overall coordination of construction is improved.

The invention relates to the technical field of building construction, in particular to a foundation construction material and a dynamic compaction construction method.The construction method comprises the following steps that S1, an early-stage preparation stage is conducted; s2, a trial compaction and parameter optimization stage; s3, a main body construction stage; s4, a multi-field coupling maintenance stage; s5, a foundation quality detection stage; and S6, an acceptance and filing stage. Through intelligent sensing and dynamic parameter regulation and control, self-adaptive optimization of the tamping process is achieved, over-tamping or under-tamping is avoided, and the foundation bearing capacity is improved by 15%-20%; the layered filling design of the gradient material is matched with different depth mechanical requirements, the grading continuity coefficient is larger than or equal to 0.5, and the compactness of the pier body is improved by 25% or above; an innovative Q value evaluation formula integrates multi-dimensional parameters, the detection accuracy rate reaches 90% or above, and the rework rate is remarkably reduced; the maintenance period is shortened to 7 days through the multi-field coupling maintenance technology, and the construction efficiency is improved by 50%; and the material cost is reduced by 30% by recycling the construction waste, and the method has economical efficiency and environmental protection performance and is suitable for various complex foundation treatment sites.

The invention discloses an ultra-thick backfill complex geological cast-in-place pile hole forming construction method, and particularly relates to the technical field of foundation pile foundation construction, and the method comprises the steps of S1, site leveling and pile position paying off, S2, 1.2 m drill bit rotary digging hole forming, S3, backfill tamping, S4, 1 m drill bit rotary digging pile machine hole forming, S5, hole cleaning, S6, reinforcement cage manufacturing and mounting, S7, guide pipe placing, S8, secondary hole cleaning and S9, pile body concrete pouring. According to the method, the super-thick backfill complex geology in-situ SDDC in-hole deep dynamic compaction and rotary excavating pile hole-forming construction technology is adopted, in a high-position backfill area, the SDDC in-hole deep dynamic compaction technology is used for forming a pile body cylindrical soil body with the diameter being 2-3 m and easy to form a hole in an original pile position, then the rotary excavating technology is used for forming a hole in a cylinder, the hole-forming quality of a pile foundation under the complex geology condition is guaranteed, and the construction efficiency is improved. The most suitable mechanical equipment can be reasonably selected for pile foundation equipment according to specific geological conditions, the construction cost can be reduced through the combined construction technology, and the pile foundation hole forming construction quality is guaranteed.

The invention relates to the technical field of construction quality evaluation, in particular to a dynamic compaction construction quality evaluation and analysis system which comprises the steps of collecting compaction vibration signals, screening out abnormal segments, extracting frequent fluctuation sections, counting peak value dense areas, recognizing impact concentration sections, tracking amplitude fluctuation changes, positioning energy accumulation areas and calculating the amplitude change rate. And the position of an inflection point is calibrated, a frequency change track is compared, a compaction state area is divided, and a compaction grade distribution map is generated. According to the method, amplitude change rate mutation fragments are eliminated, stable response sections are extracted, peak aggregation areas are divided according to time, impact concentration sections are identified, the amplitude continuous fluctuation trend is tracked, energy concentration areas are delimited, state turning nodes are positioned based on amplitude change rate comparison, and frequency span and fluctuation duration characteristics are combined. Compacting state areas are classified in a layered mode, and a compacting distribution structure is constructed.

The invention discloses an in-situ solidification construction method for a highway shallow foundation in a water-rich section of a permafrost region. The in-situ solidification construction method comprises the following steps: step 1, preparation at the early stage of construction; secondly, steel sheet pile enclosure water insulation is conducted; thirdly, in-situ soil solidification construction is conducted; fourthly, dynamic compaction encryption treatment is conducted; step 5, quality detection and molding acceptance inspection; and step 6, subsequent environmental protection and safety guarantee. Three dimensions of a steel sheet pile waterproof technology, a high-weather-resistance composite curing material in-situ curing technology and a dynamic compaction technology are integrated, and a set of systematized and standardized construction scheme is formed. According to the multi-dimensional combined method, the foundation treatment effect is improved, the comprehensiveness and pertinence of construction are enhanced, and a more effective solution is provided for road foundation treatment in the water-rich section of the permafrost region.

The in-hole deep layer dynamic compaction device for the collapsible loess foundation comprises a supporting table, a stamping rod penetrates through the middle of the inner side of the supporting table, a stamping base is fixedly installed at the bottom of the stamping rod, a top plate is fixedly installed at the top end of the stamping rod, and a guide structure is arranged on one side of the top end of the top plate. The combined use of a first motor, a half gear and teeth facilitates the subsequent longitudinal movement of a top plate, and then the subsequent longitudinal lifting of a stamping seat can be conveniently realized, so that the foundation is tamped, and when the first motor works, the half gear rotates along with the first motor; and then longitudinal movement of a connecting plate can be achieved through meshing connection of a half gear and teeth, then movement of a top plate can be achieved through longitudinal movement of the connecting plate, follow-up lifting of a stamping seat is facilitated, so that tamping treatment is conducted on the ground, and a simple buffering effect can be achieved through cooperation with a reset spring.

The invention discloses a vacuum preloading and dynamic compaction combined soft foundation treatment method which comprises the steps that a plurality of dynamic compaction holes are formed in a soft soil foundation construction site at intervals, vertical water pumping pipes are arranged in the dynamic compaction holes, and gaps between the vertical water pumping pipes and the dynamic compaction holes are filled with gravels; a plurality of vertical plastic drainage belts are arranged on the periphery of each dynamic compaction hole at intervals, and a sand layer is laid on the surface of the site and then covered with a film for sealing; the vertical plastic drainage belt in the thin film and the stratum are in a partial vacuum state through suction of a vacuum pump, and underground water is pumped and drained outwards; meanwhile, underground water in the dynamic compaction hole is sucked and discharged through a water suction pump and a vertical water suction pipe; and after first-stage vacuum preloading is completed, in-hole dynamic compaction operation is conducted on the dynamic compaction holes in sequence, gravel in the dynamic compaction holes is rammed through a conical rammer and extruded towards the outer side, and extrusion drainage consolidation of a soil body in the stratum is achieved. The method has the advantage that the construction efficiency of drainage consolidation of the soil body is improved in a vacuum preloading and dynamic compaction mode.

The present invention discloses a safe unhooking and quick recovery device for a dynamic tamping machine and its working method. The device is arranged on the truss arm of the dynamic tamping machine and comprises a circular iron plate, an electromagnetic suction cup fixed to the lower surface of the circular iron plate, a plurality of hooks spaced apart on the outer edge of the circular iron plate, and a hoisting mechanism for suspending the circular iron plate. The electromagnetic suction cup electromagnetically absorbs the upper surface of the tamping hammer. The outer edge of the tamping hammer is provided with a plurality of grooves for hooking. The tail end of the hook has a rod body, which is hinged to the outer edge of the circular iron plate and driven to rotate by a hydraulic mechanism. The advantages of the present invention are: (1) the hook and the electromagnetic suction cup are used to double-hang the tamping hammer, which can not only achieve hoisting installation, but also avoid wear of the connecting parts, and realize wear-free unhooking; (2) a two-stage hoisting mechanism is used to hoist the tamping hammer. When the tamping hammer falls, the circular iron plate hoisted by the hoisting mechanism can fall synchronously, thereby realizing rapid recovery of the tamping hammer.

The invention provides a hydraulic reclamation area storage yard foundation treatment construction method which comprises the steps that a treatment area is divided into a consolidated hydraulic reclamation sand area, a storage sand area and a new hydraulic reclamation sand area according to the formation time and compactness difference of strata, a three-dimensional drainage system is laid in the new hydraulic reclamation sand area and comprises a horizontal permeable gabion wall and a vertical drainage plate, and a gravity drainage channel is formed; the process of forming a drainage channel through vibroflotation and then carrying out dynamic compaction and densification is adopted in a consolidated area, the process of alternately implementing vibroflotation and dynamic compaction is adopted in a sand stockpiling area, the process of carrying out local vibroflotation reinforcement after layered dynamic compaction and pre-pressing is adopted in a new hydraulic reclamation area, and vibroflotation and dynamic compaction construction parameters are dynamically fed back and adjusted by monitoring gravel data. The foundation treatment problem of hydraulic reclamation areas formed in different years is solved.

The invention relates to the field of foundation pile foundation construction, in particular to a hole-forming construction method for a super-thick backfill complex geological cast-in-place pile. Comprising the steps of site leveling and pile position paying-off; performing primary drill bit rotary drilling and hole forming; a column soil body; forming a hole by a secondary drill bit rotary drilling pile machine; cleaning the hole; placing a reinforcement cage and a guide pipe; cleaning the hole for the second time; pile body concrete is poured; and inspecting and accepting. According to the method, a single construction process adopted in original cast-in-place pile hole forming is changed, an ultra-thick backfill complex geology in-situ SDDC in-hole deep dynamic compaction and rotary excavating pile hole forming construction technology is innovatively adopted, in a high-position backfill area, the SDDC in-hole deep dynamic compaction technology is used for forming a pile body cylindrical soil body easy to form a hole at an original pile position, then a rotary excavating process is used for forming a hole in a cylinder, and the pile body cylindrical soil body easy to form a hole is formed; the pile foundation hole forming quality under the complex geological condition is guaranteed, the construction cost is reduced through the combined construction technology, and the pile foundation hole forming construction quality is guaranteed.

The invention relates to the technical field of roadbed treatment, and discloses a soft roadbed solid waste backfilling and dynamic compaction reinforcing method which comprises the following steps: early-stage preparation: carrying out detailed geological survey on an area where a soft roadbed is located, screening and treating proper solid waste materials, and carrying out dynamic compaction on the solid waste materials; making a solid waste backfilling and dynamic compaction reinforcement construction scheme according to an engineering investigation result and solid waste characteristics; subgrade cleaning: removing soft soil, sundries and vegetation on the surface of the soft subgrade; the solid waste materials are evenly laid on the soft roadbed in a layering mode, and the thickness of each layer is usually controlled to be 30-50 cm; preliminary compaction is conducted, specifically, each layer of solid waste backfilled on the soft roadbed is compacted through a light road roller; and trial ramming: closing. According to the method, 1%-2.5% of ammonium carbonate and 1%-2.5% of ammonium bicarbonate are added into the ground steel slag, so that the steel slag can be effectively removed, and the problems that free calcium oxide and free magnesium oxide are subjected to hydration reaction when encountering water to cause volume expansion, and a roadbed possibly bulges and cracks after backfilling are solved.

The invention relates to a dynamic compaction construction intelligent monitoring and self-adaptive control method based on a physical information neural network, and the method comprises the steps: arranging a vibration sensor array in a construction safety region, collecting a compaction vibration signal in real time, and extracting time domain, frequency domain and spatial propagation characteristics; constructing a physical information neural network model, taking a soil elastic wave propagation equation as a physical constraint, taking vibration characteristics and monitoring point space coordinates as input, and predicting three-dimensional distribution of soil physical property parameters; based on the predicted soil body parameters, calculating the distribution and development trend of the bearing capacity of the foundation by adopting a Taisha foundation bearing capacity theory; a multi-target optimization model with the bearing capacity reaching the standard, the minimum energy consumption and the shortest time as targets is established, and follow-up tamping parameters are optimized; and construction is executed according to the optimized parameters, and data and model parameters are continuously updated. Compared with the prior art, the problems that in traditional dynamic compaction construction, the soil body state cannot be observed, and optimization lacks theoretical support are solved, and intelligentization and accurate control over the construction process are achieved.

The utility model discloses a compaction settlement measuring device of a dynamic compaction machine, which belongs to the technical field of foundation construction survey and comprises a fixed seat, a mounting frame and a ruler. The fixed seat is used for being fixed on a lifting hook of a rammer; the mounting frame is detachably connected with the fixing seat, the mounting frame comprises a connecting part, a supporting rod and a scale mounting part which are fixedly connected in sequence, the connecting part is detachably connected with the fixing seat, and the scale mounting part is used for being detachably connected with a scale. According to the compaction settlement measuring device of the dynamic compaction machine, a specially-assigned person does not need to erect a scale, labor is saved, and personnel safety is ensured; after the lifting hook is lifted down, the reading can be measured, so that the waiting time of workers for standing the scale back and forth is saved, and the construction efficiency is improved; the scale is vertically installed on the lifting hook, the position and the angle are fixed, the reading is more accurate, and the measurement accuracy is improved.

The utility model discloses an intelligent operation system of a dynamic compactor, which comprises a positioning device arranged on the dynamic compactor and used for receiving and sending the position information of the dynamic compactor; the positioning unit is connected with the positioning device and is used for positioning the dynamic compaction machine and the compaction point position; the data transmission unit is connected with the positioning unit and used for transmitting and recording the position information of the dynamic compaction machine; the sensor unit is arranged on the dynamic compactor and is used for acquiring the operation information of the dynamic compactor; the controller is arranged on the dynamic compactor and used for receiving the control signal and controlling the dynamic compactor to work; and the remote control unit is respectively connected with the sensor unit, the controller and the data transmission unit, and is used for receiving the running state data information of the dynamic compactor, generating a control signal and sending the control signal to the controller to control the action of the dynamic compactor. According to the invention, 24-hour uninterrupted work can be remotely controlled, and normal operation can be carried out in rainy and snowy weather, so that the working efficiency is effectively improved, and the investment of labor cost is reduced.

The invention provides a deep filling dynamic compaction reinforcement depth and surface wave velocity change rule analysis method. The method comprises the steps that in a deep and thick soil filling site, at least four test areas are selected to conduct dynamic compaction construction of different energy levels, the dynamic compaction energy levels comprise the low energy level, the medium energy level, the high energy level and the ultrahigh energy level, and heavy dynamic penetration tests and multiple transient surface wave tests are conducted on each area before and after dynamic compaction; a first reinforcement depth H1 and a second reinforcement depth H2 are determined through the dynamic detection impact number growth rate; and carrying out statistics on the dynamic probing numbers and the corresponding surface wave velocities before and after dynamic compaction at the same position of different test areas, establishing a relation curve of the surface wave velocities and the dynamic probing numbers of the filling soil, and determining a judgment standard of the compactness of the filling soil in the field. Reliable theoretical basis and technical guidance are provided for obtaining key mechanical indexes of deep and thick soil filling and reasonably determining the dynamic compaction reinforcement depth, a solid foundation is laid for design and construction of similar projects, and the application prospect is wide.

The invention relates to the technical field of dynamic compaction construction, in particular to a dynamic compaction construction informatization management system which comprises a rammer, a microcomputer and a handheld terminal, the microcomputer is in communication connection with the handheld terminal, and the microcomputer is connected with a rammer stability maintaining assembly and a detacher control module. The rammer stability maintaining assembly is used for maintaining the balance of a rammer and preventing large-angle inclination in the falling process from affecting the dynamic compaction accuracy, the rammer stability maintaining assembly is arranged on the rammer and comprises a control electromagnetic valve and an oil pump, and the detacher control module is used for controlling the rammer to fall reliably during dynamic compaction and controlling the rammer to fall reliably during lifting and suspending. The rammer is prevented from unhooking, and the construction safety is improved. The rammer stability maintaining assembly is arranged, according to data fed back by the tilt angle sensor on the rammer, the microcomputer controls the electromagnetic valve and the oil pump, controls oil flowing and adjusts the gravity center of the rammer, stable falling of the rammer is ensured, and the reliability and controllability of dynamic compaction work are improved.

The invention discloses a dynamic compaction machine capable of being automatically, conveniently and accurately adjusted to required compaction energy, and relates to the field of dynamic compaction machine construction. The tension sensor is additionally arranged between the luffing mechanism and the pulling plate, and the balance force composition and decomposition relation in the uniform-speed lifting process of the rammer is combined, so that the weight of the rammer can be automatically, conveniently and accurately obtained; a height sensor is additionally arranged on a rack of a main winch of the dynamic compaction machine to sense the distance between two corresponding sensing steel sheets on a hoisting steel wire rope before and after a rammer is hoisted, and the actual falling distance of the rammer can be automatically, conveniently and accurately obtained; and according to the fact that the tamping energy is equal to the product of the weight of the rammer and the actual falling distance of the rammer, when the actually measured tamping energy reaches a set value, the unhooking rope winch can adjust the length of the unhooking steel wire rope and pull the unhooking device, so that the rammer is automatically separated from the unhooking device, and the rammer freely falls to tamp a target object. According to the invention, the rammer can be automatically, conveniently and accurately adjusted to the required ramming energy before each ramming in the construction process of the dynamic compactor, the ramming quality and efficiency are improved, and the universality is high.

The invention belongs to the technical field of dynamic compaction foundations, discloses a dynamic compaction foundation quality detection sampling method, and aims to solve the problem that a core sample is easily damaged when the core sample of the dynamic compaction foundation is obtained by adopting an existing coring bit. The method comprises the following steps: (1) cutting and drilling an outer-layer soil body by using outer-layer cutting teeth on an outer cutting cylinder; (2) inner-layer cutting teeth on an inner cutting cylinder are used for cutting and drilling an inner-layer soil body; (3) synchronously driving a protective cylinder for coating the core sample to move downwards; (4) when the lower end surface of the protective cylinder moves to a designed depth, cutting a soil body below the core sample by using a cutting blade; and (5) taking out the protective cylinder from the inner cutting cylinder, and opening the protective cylinder to obtain a core sample of the dynamic compaction foundation. According to the invention, disturbance to the dynamic compaction foundation core sample can be reduced, and the core sample forming quality is improved.

The invention discloses a flocculation-vacuum-electroosmosis-dynamic compaction combined soft soil foundation treatment method which comprises the following steps: S1, adding a PAM (Polyacrylamide) flocculant into mud in a mud pit, and carrying out mud flocculation treatment; s2, inserting a drainage device into the flocculated slurry, wherein the drainage device is connected with a vacuum pump through a main drainage pipe; s3, electro-osmosis components are inserted into the slurry, the electro-osmosis components are composed of anode electro-osmosis components and cathode electro-osmosis components, the anode electro-osmosis components and the cathode electro-osmosis components are inserted into the slurry pool in a crossed and spaced mode, and the anode electro-osmosis components and the cathode electro-osmosis components are connected with corresponding external direct-current power sources through wires; s4, geotextile is laid on the upper surface of the slurry, a vacuum pump is turned on for vacuum preloading drainage, and an external direct-current power source is turned on for vacuum-electroosmosis combined drainage in the later period of vacuum preloading; and S5, dynamic compaction treatment is conducted, point compaction is conducted through a compaction machine, then full compaction is conducted, and the soft soil foundation is completed. According to the method, the soft soil foundation treatment efficiency is improved, and the good consolidation effect on the soil body is achieved.

The invention discloses a composite foundation construction method based on a karst area, a composite foundation and a transformer substation, and relates to the technical field of civil engineering. The method comprises the steps that grouting treatment is conducted on a cave within the preset depth below the datum plane of a target area; according to the column pier distribution characteristics of the target building, the target area is rolled and backfilled to the target height in a layered mode; dynamic compaction treatment is conducted on the target area; according to the rock stratum distribution characteristics of the foundation of the target area, rigid piles are constructed in the foundation of the target area; paving a mattress layer on the target area, and compacting the mattress layer; and a raft foundation is arranged on the mattress layer. The rigid piles, the soil layer between the piles, the pile top cushion layer and the raft foundation are organically configured to form the composite foundation in a combined mode, the overall bearing capacity of the foundation can be effectively improved, and the bearing capacity and settlement of the whole project are effectively controlled.

The utility model belongs to the field of centrifugal simulation tests in geotechnical engineering, and provides a dynamic compaction simulation test device in a hypergravity field, which comprises a box body, a three-dimensional positioning system and an automatic compaction system, the three-dimensional positioning system comprises an X-direction movement module, a Y-direction movement module and a Z-direction movement module, the X-direction movement module is installed on the box body, the Y-direction movement module is installed at the moving end of the X-direction movement module, and the Z-direction movement module is installed at the moving end of the Y-direction movement module. According to the device, a dynamic compaction simulation test of a super-gravity field can be carried out in a centrifugal machine through a model, a three-dimensional positioning system on the box body is used for accurately adjusting the compaction position, automatic falling and lifting of a compaction hammer are achieved through an automatic compaction system, automatic simulation of dynamic compaction construction under the conditions of different compaction positions and different compaction energy can be achieved, and the construction efficiency is improved. The test efficiency is greatly improved, and a reliable way is provided for verifying and optimizing the effect of a foundation treatment engineering project.

The invention relates to a dynamic compactor capable of automatically hooking and unhooking. The rear part of the construction vehicle is provided with a machine platform, and the side part of the machine platform is provided with a field controller; side supports are installed on the two sides of the machine tool platform, a multi-stage mechanical arm with controllable deformation is installed on the side supports, a stable jacking device combined with the construction ground is installed at the lower end of the last stage of the multi-stage mechanical arm, a base plate is installed on the front portion of the last stage of the multi-stage mechanical arm, and an automatic hooking and unhooking type tamping device is installed on the base plate. The automatic hooking and unhooking type tamping device comprises an annular rail, at least one elastic hooking and unhooking assembly is installed on the annular rail, the automatic hooking and unhooking type tamping device further comprises a driving assembly for driving the elastic hooking and unhooking assembly to move circularly along the annular rail, and a guide sleeve is installed at the top of the side of the annular rail; a lifting rod with the top end provided with a limiting baffle and the bottom end provided with a rammer is installed in the guide sleeve, a hook is arranged in the middle of the lifting rod, and an unhooking wedge block acting on the elastic hooking and unhooking assembly is arranged on the inner side of the upper portion of the annular rail. According to the dynamic compaction machine capable of automatically hooking and unhooking, flexible displacement can be achieved, continuous and dense compaction can be achieved, comprehensive compaction operation on a soft soil foundation is executed, compaction treatment on the soft soil foundation is efficiently conducted, and the construction efficiency is improved.

The present application relates to a rammer and a foundation compaction construction process using the rammer, and relates to the field of compaction equipment. The rammer includes a chassis and a top plate, and a locking rod assembly is rotatably connected to the chassis. A receiving plate is placed on the side of the chassis close to the top plate, and the locking rod assembly passes through the receiving plate and the top plate. A fixing piece is detachably connected to the locking rod assembly, which is pressed against the side of the top plate away from the receiving plate. A plurality of hammer discs are stacked on the side of the receiving plate away from the chassis, and each of the hammer discs is provided with a long strip mounting hole on the side away from the chassis. A plurality of locking plates are fixedly connected to the locking rod assembly, and one locking plate corresponds to one mounting hole, and the locking plate is placed in the mounting hole. Both long side walls of the mounting hole are provided with arc grooves. The locking rod assembly is rotated, and both ends of each locking plate are inserted into a corresponding arc groove. The present application has the effect of improving the work efficiency of adjusting the weight of the rammer.

The invention relates to the technical field of dam foundation treatment, and discloses a low-liquid-limit clay dam foundation soil body excavation tedding thickness calculation method, which comprises the following steps: firstly, collecting an undisturbed soil sample and a disturbed soil sample, and obtaining physical and mechanical parameters through an indoor test; performing a light compaction test by using the disturbed soil sample, and calculating a first soil layer compaction coefficient according to the height change before and after compaction; an indoor dynamic compaction physical model meeting the similarity criterion is constructed based on the white Jinhan Pi theorem, the conversion relation between model compaction energy and on-site compaction energy is deduced through a geometric similarity coefficient, a time similarity coefficient and a quality similarity coefficient, and a second soil layer compaction coefficient is measured; and the maximum value of the two compaction coefficients is taken as a final calculation parameter, and the excavation tedding thickness is calculated in combination with the design thickness of the dam foundation bearing stratum. According to the method, the indoor test is used for replacing field trial compaction, so that the test cost is reduced, two measurement schemes of a compression modulus method and an accumulated compaction settlement method are provided, and the calculation result is more in line with engineering practice.

The invention discloses a construction method of a permafrost block stone dynamic compaction replacement composite foundation. The construction method comprises the following steps: step 1, a project construction preparation stage; secondly, a dynamic compaction scheme is designed; 3, surface layer freezing breaking and drainage system construction; step 4, preparation before dynamic compaction construction; step 5, guide hole construction; sixthly, dynamic compaction construction is conducted; step 7, construction recording; step 8, acceptance assessment and result archiving; and ninthly, quality, safety and environmental protection control in the construction process is conducted. The invention innovatively provides a three-stage reinforcing process of'guide hole dumping of block stones, dynamic compaction and full compaction ', a replacement body with a drainage function is formed by prefabricating guide holes and filling hard rubbles and broken stones with good gradation, a soft soil layer is effectively replaced and compacted, and a composite foundation with excellent bearing performance is constructed.

The utility model belongs to the technical field of house building municipal administration and highway engineering, and particularly relates to a fixing device for preventing gravel from splashing in the dynamic compaction construction process. Comprising a supporting frame and a shielding net, the supporting frame is composed of two vertical beams and a cross beam, a plurality of U-shaped supporting structures are arranged between the two vertical beams, and a plurality of first fixing chains and second fixing chains are arranged between the cross beam and the U-shaped supporting structure at the topmost end and between the adjacent U-shaped supporting structures; a plurality of shielding areas are formed among the adjacent U-shaped supporting structures, the first fixing chains, the second fixing chains and the vertical beams, and shielding nets are arranged in the shielding areas. Splash broken stones in the dynamic compaction construction process are shielded through the shielding net in the shielding area, the shielding range can be widened through the U-shaped supporting structure, the gravel splashing range is reduced, the U-shaped supporting structure is fixed through the first fixing chain, the shielding net is fixed through the second fixing chain, and the shielding net is prevented from being damaged.

This invention relates to the field of soft soil foundation reinforcement technology, specifically to a dynamic compaction construction device and method for soft soil foundations. The device includes a perforating rod and an operating assembly. The operating assembly includes a fixed plate, positioning strips, and a first movable block. The fixed plate is coaxially fixed to the top of the perforating rod, and a first fixing hole is formed on the side wall of the fixed plate. Two positioning strips are slidably connected, each with a circular through hole and a guide ring fixedly mounted. Each positioning strip also has a buckle that engages with the first fixing hole. The first movable block is slidably positioned at the center of the side of the fixed plate away from the perforating rod. This invention can limit the direction of the artificial channels generated by the perforating rod while adapting to different construction requirements. It ensures that the drainage direction of soil moisture under subsequent compaction is uniformly oriented in one direction, ensuring good overall drainage without requiring additional manpower and resources.

This invention discloses a method for determining the coal-based solid waste disposal rate in underground backfilling faces. The coal-based solid waste disposal rate is the ratio of the amount of coal-based solid waste disposed of in the backfilling faces to the total amount of coal-based solid waste in the mine. The determination steps are as follows: First, the total amount of coal-based solid waste Q in the mine is calculated; then, based on the proportion of backfilling materials used in the mine, the proportion of coal-based solid waste in the backfilling materials is determined; the layout of each backfilling face in the mine is determined, and the backfilling space volume V is calculated; the weak dynamic force P and the number of actions x of the backfilling support on the backfill body are determined, and a weak dynamic compaction test of the backfilling material is conducted to determine the bulk density ρ of the backfilling material after the weak dynamic action; finally, the total amount of coal-based solid waste Q disposed of in each backfilling face in the mine is calculated. c Finally, the coal-based solid waste disposal rate η is calculated. This invention quantitatively determines the coal-based solid waste disposal effect in the backfilling face through the coal-based solid waste disposal rate, and the results can provide a basis for the design of mine backfilling systems and the evaluation of backfilling effects.