352results about "Embankments" patented technology

The invention belongs to the technical field of steel sheet piles, and discloses a steel sheet pile for compensating stratum loss during pile pulling and a construction method.The steel sheet pile comprises a plurality of steel sheet pile units, and each steel sheet pile unit comprises a plurality of steel sheet piles; the foundation pit sides of the steel sheet pile units are connected with a plurality of compensation bags, and grouting systems are arranged on the foundation pit sides of the compensation bags. The foundation pit side of the steel sheet pile is coated with viscous grease, the side, facing the steel sheet pile, of the compensation bag is coated with pressure-sensitive adhesive, and the compensation bag is temporarily connected with the steel sheet pile; the grouting system comprises a main grouting pipe, the bottom of the main grouting pipe is connected with a horizontal grouting pipe, the side, facing the steel sheet pile, of the horizontal grouting pipe is connected with a plurality of flow dividing pipes, and the flow dividing pipes correspond to the compensation bags. A vertical branch pipe is upwards separated from the middle position of the flow dividing pipe, and is connected with a grouting connector at the bottom end of the corresponding compensation bag; the tail end of the flow dividing pipe is downwards divided into an inclined grouting pipeline, and the inclined grouting pipeline faces the lower portion of the steel sheet pile. The technical problem that filling is not timely due to the fact that grouting pipes are installed to fill gaps after steel sheet piles are pulled out in the prior art is solved.

The invention belongs to the technical field of solid waste recycling and controllable low-strength material production, and particularly discloses a method for preparing a controllable low-strength material from lithium slag and shield muck. The controllable low-strength material with the fluidity larger than 170 mm and the 28d unconfined compressive strength of 0.3-8 MPa is successfully developed by taking the lithium slag instead of traditional cement as a cementing material, taking the shield muck as a fine aggregate and taking the quicklime as an alkaline activator and adding a polycarboxylic acid type high-efficiency water reducing agent to adjust the fluidity through reasonable proportioning, and the controllable low-strength material with the fluidity larger than 170 mm and the 28d unconfined compressive strength of 0.3-8 MPa is prepared. Under the condition that vibration is not needed, narrow construction areas can be automatically filled, and most backfill projects are met. The cement-free cementing material developed by exciting the lithium slag through the alkaline exciting agent can replace cement, the material cost is effectively reduced, on the other hand, a large amount of lithium slag and shield muck are secondarily utilized, solid waste recycling is promoted, environmental pollution is reduced, and high economic benefits and environmental benefits are achieved.

The invention discloses a dredged mud upper and lower part double-face combined vacuum consolidation drainage method, which comprises the following specific implementation processes: laying a horizontal sand bag containing a PVC (Polyvinyl Chloride) pipe and a vertical drainage pipe at the bottom of a cofferdam foundation pit to serve as a bottom drainage system, blowing and filling dredged mud in a layered manner, controlling the thickness and the water content of each layer, and when the water content of a soil body is lower than twice liquid limit, stopping drainage; starting the bottom vacuum water pumping device to perform preliminary water drainage, inserting straw bundles into the soil body through hollow pipes with bottom covers to form a vertical water drainage structure after the strength of the soil body meets the requirement, sequentially laying geotechnical cloth, a straw woven blanket, a PVC water drainage pipe network and a sealing film on the top to construct a top vacuum system, and finally synchronously starting the top vacuum water pumping device and the bottom vacuum water pumping device. The vacuum difference is controlled by adjusting the ventilation device, and upper and lower double-face combined vacuum consolidation drainage is achieved. The drainage consolidation of the dredged mud is effectively accelerated, the treatment efficiency is improved, and the drainage effect is enhanced through precise control over the vacuum degree and application of materials such as straw.

The invention relates to a water and land construction rapid filling method suitable for a cofferdam with cohesive soil at a soil taking point. The water and land construction rapid filling method comprises the following steps of A, underwater throwing filling, B, overwater turning filling and C, land filling of a dam core. Water throwing and land throwing are combined, cofferdam forming is accelerated, inland river conventional equipment is adopted for overwater construction, construction organization is facilitated, adopted dredgers are backhoe dredgers and grab dredgers which are commonly used for earth cutting in inland rivers, and the ships are shallow in draught, convenient to transport in the inland rivers, free of weather influence, capable of working continuously, capable of saving the construction period, capable of reducing soil disturbance and convenient to throw and fill water. The overall stability of the cofferdam can be improved, earthwork balance is achieved, cost is saved, environment friendliness is achieved, and good social and economic benefits are achieved.

The invention discloses a preparation method and application of a compaction-free solid waste polymerization roadbed filler constructed by adopting a dump filling method, belongs to the field of high-value and large-scale utilization of solid waste building materials, and particularly relates to a preparation method and a construction process of the compaction-free solid waste polymerization roadbed filler (comprising construction waste and tunnel excavation fragments) constructed by adopting the dump filling method. Large-particle-size building waste fragments and an early-strength solid waste-based cementing material are polymerized through a throwing and filling method, compaction-free and vibration-free construction is achieved through the self-leveling and self-compacting characteristics of cementing material slurry, vertical layered pouring can be achieved, and high-valued and large-scale utilization of solid waste and engineering economy are both considered. According to the present invention, the self-leveling and self-compacting characteristics are provided, the characteristics of the slurry are obtained through the preparation method, the ratio design in the preparation method is important, and the experiment support is provided, such that the ratio design and the experiment process and data are required;

The invention discloses a ground source heat pump buried pipe backfilling compactness real-time monitoring method, and relates to the technical field of ground source heat pump system construction quality control. The method comprises the following steps: acquiring grouting port pressure time sequence data Pin (t), measuring point pore pressure time sequence data Pi (t), slurry density rho and grouting port space coordinates in real time, extracting pressure wave propagation time to calculate the wave velocity, constructing a physical model for describing the corresponding relation between the wave velocity vp and the compactness D, inverting the measuring point compactness, and calculating the density of the grouting port. And a three-dimensional compactness distribution field is generated through spatial interpolation to identify a defect area, and after defect coordinates are converted into global coordinates, the grout supplementing amount and the grouting pressure are calculated, so that directional grout supplementing is achieved. The method is mainly used for real-time monitoring of compactness, accurate defect recognition and targeted reinforcement in ground source heat pump buried pipe backfilling construction, and construction quality is guaranteed.

The invention discloses a wharf dismantling and backfilling settlement control construction method based on real-time monitoring, and belongs to the technical field of wharf engineering construction and settlement control. Existing wharf dismantling and backfilling construction lacks a systematic settlement control process and does not depend on real-time monitoring to realize dynamic feedback, so that the construction quality and the settlement control effect are poor. According to the method, partition division, threshold value determination and monitoring point position setting are prepared before construction, partition and segmented dismantling, layered backfill compaction, settlement dynamic adjustment and circulating construction are conducted, settlement and horizontal displacement data are collected through real-time monitoring in the whole process and transmitted to a data processing end, and construction parameters are adjusted and areas exceeding the threshold value are processed according to the data. The method is mainly used for accurately controlling settlement in wharf dismantling and backfilling construction, guaranteeing construction quality and safety of surrounding buildings and underground pipelines, and improving construction orderliness and safety.

The invention discloses a construction method for excavating an upside-down well wall of a deep foundation pit under an eccentric compression working condition. The construction method is suitable for an asymmetric load scene that the soil covering height of one side of a vertical shaft is obviously larger than that of the other side of the vertical shaft. The method comprises the steps that firstly, grouting is conducted on the periphery of the shaft wall of a vertical shaft under the current ground, and a soil body reinforcing area is formed; then, a mouth locking ring beam is constructed at a shaft mouth of the vertical shaft, an upper structure comprising a retaining wall, a reverse pressing plate, a retaining wall ring beam and a plate support is upwards constructed on the mouth locking ring beam, and soil covering side earthwork is synchronously backfilled to the level ground elevation in the construction process; next, an upside-down well wall method is adopted for subsection downward excavation, an annular arch frame, angle braces and anchor rod supports are constructed after each section is excavated, and an upper ring beam and a lower ring beam are arranged at the horsehead position and connected with the adjacent arch frames through vertical supports; and finally, concrete bottom sealing is conducted on the shaft completion face. The anti-overturning moment is formed through the reverse pressing plate and synchronous backfilling, and the problem of well wall instability caused by eccentric loads is effectively solved in combination with a multi-stage supporting system.

The invention relates to the technical field of landslide disaster treatment, and discloses a cutting section landslide treatment method and structure based on a steel corrugated plate, which adopts an innovative combined structure of the steel corrugated plate and a reinforced concrete lining to realize advantage complementation of flexibility and rigidity; wherein the steel corrugated plate can effectively resist external soil pressure and flexibly absorb settlement deformation of a foundation by virtue of extremely high axial compressive strength and excellent deformation adaptive capacity, and meanwhile, the steel corrugated plate is used as a supporting template of a concrete structure, so that the aim of quickly implementing protection is fulfilled; the reinforced concrete lining greatly improves the overall rigidity and the shear strength of the structure, and the problem that a pure steel structure is prone to local instability is fundamentally avoided; and the two synergistically form a strong retaining system, so that the treatment effect is lasting and stable, and potential safety hazards are thoroughly solved.

The present application relates to geotechnical engineering and geological disaster prevention technical field, specifically disclose a kind of combined bedrock reconstruction and slope modification multi-cladding layer slope and its construction method, the present application is strengthened by constructing cemented rock-embedded groove the binding force of slope and bedrock, form anti-sliding "structure pile" effect, control bedrock seepage passage, significantly improve the overall collaborative stability of slope-bedrock;In the process of layered filling, embedded cemented soil and rock interlayer body, constitute continuous, multi-level interlayer structure, enhance the integrity of structure, overcome the problem of localization of traditional supporting structure;By being arranged between cemented soil and rock interlayer body and conventional soil and rock mixture embedded cemented layer gravel drainage groove, realize multi-channel grading drainage and anti-seepage function in slope, effectively reduce pore pressure;Through conventional drainage facilities and the drainage structure inside slope cooperation, form "upper cut, surface guide, lower discharge, buffer" four-in-one composite drainage system, improve the anti-sliding performance and seepage control ability of slope.

To provide a ground improvement method that forms a drainage channel from the upper surface side, instead of the slope surface, of a banking soil so as to form simply and strongly a drainage channel under the banked ground even in a narrow place in a mountainous area.SOLUTION: A ground improvement method according to the present invention includes: (1) providing a first excavation hole 1 by rotatively inserting an auger 10 from an upper surface of a banked ground in an underground direction and charging a drainage material 7 into the first excavation hole 1; then, (2) providing a second excavation hole 2 by rotatively inserting the auger 10 from the upper surface of the ground in the underground direction at a position in proximity to the first excavation hole 1 and charging the drainage material 7 into the second excavation hole 2; and (3) excavating a boundary region 3 between the first excavation hole 1 and the second excavation hole 2 by the auger 10 to communicate the first excavation hole 1 and the second excavation hole 2 with each other, and mixing the drainage material 7 in both holes to form a drainage 4.SELECTED DRAWING: Figure 2

The invention belongs to the technical field of foundation pit fat groove backfilling construction, and particularly relates to a flow state solidified soil filling body structure for an adjacent-water-depth foundation pit and a construction method of the flow state solidified soil filling body structure. The invention provides a flow-state solidified soil filling body structure. The flow-state solidified soil filling body structure comprises a backfilling body filled in a foundation pit fat groove area and an anti-seepage curtain arranged on the periphery of the foundation pit fat groove area. The backfill body sequentially comprises a horizontal impermeable layer, a flow-state solidified soil main body and a sealing layer from bottom to top, and a plurality of pieces of reinforced gridding cloth are horizontally arranged in the flow-state solidified soil main body; the anti-seepage curtain comprises a base layer structure and a main body structure from bottom to top, the base layer structure is formed by flow state solidified soil, and the main body structure comprises a vertical anti-seepage layer and flow state solidified soil layers arranged on the two surfaces of the vertical anti-seepage layer. According to the flow state solidified soil filling body structure for the adjacent-water-depth foundation pit, the anti-seepage performance is remarkably improved, uneven subsidence of a backfill structure is avoided, and long-term seepage prevention and stability of the surrounding environment of a building are guaranteed.

The application discloses a modified wheat straw fiber reinforced foam concrete backfill material and a preparation and use method, and belongs to the field of civil engineering foundation filling construction. The backfill material is composed of concrete dry powder, a composite foaming agent and modified wheat straw fiber. The modified wheat straw fiber is obtained by corroding wheat straw segments with alkali solution, and then immersing the alkali-corroded wheat straw segments into a fiber surface coating film glue solution or directly spraying a layer of fiber surface coating film glue solution on the surface of the alkali-corroded wheat straw segments, so that a layer of fiber surface coating film is attached to the surface of the wheat straw segments. In use, the concrete dry powder, the composite foaming agent and the modified wheat straw fiber are mixed into a slurry according to a proportion and filled into a fat groove. The modified wheat straw fiber is added into the foamed concrete, so that the defects of poor shearing resistance and weak impact resistance of traditional foam concrete filling materials are overcome, and the added industrial value of the wheat straw is improved.

The invention provides a pile foundation bearing platform structure of a stockyard and a construction method thereof, and relates to the technical field of stockpiling. A pile foundation bearing platform structure of a stockyard comprises a bearing platform main body formed by pouring reinforced concrete and an engineering pile, the bottom face of the bearing platform main body is fixedly connected with the engineering pile, a haunching part integrally formed in a pouring mode is arranged on at least one lateral stress end face side of the bearing platform main body, and the haunching part extends in the lateral direction and the vertical direction. Therefore, the lateral load-bearing area and the total height of the pile foundation bearing platform structure are increased. Fertilizer grooves are formed in the peripheries of the bearing platform main body and the haunching part, and improved soil bodies are backfilled and compacted in the fertilizer grooves, so that the improved soil bodies are in close contact with the side faces of the bearing platform main body and the haunching part. In addition, the invention further provides a construction method of the pile foundation bearing platform structure of the stockyard, the pile foundation bearing platform structure can be efficiently and reliably constructed, cooperative work of the bearing platform body and the peripheral improved soil body is achieved, and therefore the purpose of improving the horizontal bearing capacity of the pile top is economically and effectively achieved.

The application discloses a dam foundation pressure measuring pipe construction method, and belongs to the technical field of dam foundation seepage monitoring. The steps include the following: firstly, construction parameters are determined through survey and design, and the hole is cleaned after drilling construction; a pressure measuring pipe containing a double-layer filter layer is processed and assembled, the first filter material is backfilled to serve as support before the pipe is lowered into the hole, and the second filter material is backfilled in layers to form a filter layer in the gap outside the pipe; a special filler is used to backfill bentonite balls in grains to form a first flexible sealing layer, cement bentonite slurry is poured on the upper side to form a second rigid anti-seepage layer, and a double anti-seepage system is constructed; after passing the sensitivity test, the concrete base is poured, and the protection box is installed. The method solves the problems of easy failure of traditional process sealing and uneven backfilling, improves the construction quality and the reliability of monitoring data, and is suitable for complex dam foundation geological conditions.

The utility model discloses a double-pile type L-shaped embankment structure which comprises pile foundations, a concrete cushion layer, an L-shaped wall body, handrails, a broken stone cushion layer and grouted rubble. The pile foundation is driven into an original embankment foundation, the concrete cushion layer is laid on the original embankment foundation, the L-shaped wall body is arranged on the concrete cushion layer, the upper end of the pile foundation penetrates through the concrete cushion layer into the L-shaped wall body, the side, close to a riverbed, of the L-shaped wall body is connected with the broken stone cushion layer, and the broken stone cushion layer is arranged on the riverbed. The rubble hardcore is provided with grouted rubble; backfill soil is arranged on the side, away from the riverbed, of the L-shaped wall body, and a road is arranged on the backfill soil; and the handrails are arranged on the L-shaped wall body. The double-pile type L-shaped embankment structure provided by the utility model aims to overcome the existing defects, is stable in structure, convenient to construct and low in manufacturing cost, and ensures the protection function of the embankment.

The invention discloses an anti-sinking apron for a building outer wall and a construction method thereof, the anti-sinking apron comprises a plurality of first baffles arranged at intervals along the periphery of the multi-face outer wall, each first baffle is vertically supported to the ground, and one end of each first baffle is vertically connected to the outer wall on the corresponding side; the multiple second baffles are arranged on the peripheries of the multiple first baffles in a surrounding mode, each second baffle is vertically supported to the ground, the multiple first baffles on the outer walls on the corresponding sides are connected in series through the second baffles, the adjacent second baffles are connected through connecting pieces, and a foundation pit groove is defined by the multiple second baffles and the multiple outer walls. The foundation pit groove is filled with a soil layer; the steel bar layer is connected to the top of the foundation pit groove; and the apron slope is poured on the top of the steel bar layer in a sloping mode, and the apron stability is improved by arranging the anti-sinking apron.

The invention relates to the technical field of abandoned mine ecological restoration, in particular to a method for restoring a mine through engineering abandoned muck and slurry backfilling. The method comprises the following steps: cleaning a mine pit, leveling a terrain, backfilling engineering waste slag, and laying a tailing transition layer to form a graded tailing layer; impurities in the engineering waste muck are screened out, the engineering waste muck is laid on the grading tailing layer, and a compacted muck layer is obtained through compaction; the method comprises the following steps: flocculating and dewatering engineering waste slurry to obtain cement control slurry, adding an exogenous fertilizer for improvement, and then mixing with field waste slag in proportion and backfilling to form a sludge vegetation layer; according to the method, the waste mine is used as a raw material, the residue covering compost layer and the vegetation surface soil layer with certain thickness are sequentially covered on the waste mine, the synergistic ecological effect of soil reconstruction and restoration treatment of the waste mine is formed, green cyclic utilization of waste resources is achieved, the treatment cost of the waste mine is reduced, and the high efficiency and sustainability of mine ecological restoration are improved.

The application relates to the technical field of water conservancy engineering foundation pit pipe well landfill, and particularly discloses a water conservancy engineering foundation pit pipe well landfill construction method, which specifically comprises the following steps: early preparation, construction preparation, landfill operation and post-treatment. The water conservancy engineering foundation pit pipe well landfill construction method is also used in a water conservancy engineering foundation pit pipe well landfill construction device, which comprises a fixing mechanism and a moving mechanism. According to the cooperation between the fixing mechanism and the moving mechanism, the filling material of the foundation pit can be filled layer by layer during the process of filling the foundation pit pipe well. The filling material is continuously filled layer by layer, and the filling process can be vibrated, so that the filling material is uniformly distributed and compacted, the filling layer has better stability, the continuous layer-by-layer filling method can make the landfill operation more standardized, and the filling work can be more efficiently completed.

The invention relates to the technical field of coastal zone ecological restoration, and discloses a tidal creek pattern construction method and a dredged soil ecological utilization method.The tidal creek pattern construction method comprises the following steps that a tidal creek restoration area is selected, and a spacing dam is constructed on the periphery of the restoration area; a drainage water gate is arranged on the water-facing boundary of the spacing dam, the restoration area is filled with dredged soil in a fixed-point hydraulic reclamation mode, and a plurality of mud outlets are formed; a drainage channel is formed in the restoration area through natural drainage or artificial guide drainage; after the dredged soil is solidified, the drainage sluice is dismantled; and lowering or removing a sea-facing boundary structure of the spacing dam to promote formation of a natural tidal creek system. The invention provides an artificial guidance and natural molding coupled tidal creek pattern construction method, and solves the technical contradiction of'manual intervention and natural process collaboration 'in tidal flat habitat restoration.

The present application relates to a kind of highway bridge engineering construction methods, comprising the following steps: first, pile foundation pouring;Second, excavate foundation pit;Third, dig and set operating area;Fourth, break pile head;Fifth, support first formwork;Sixth, pour cushion;Eighth, support second formwork and third formwork;Ninth, lap pier body embedded reinforcement;Tenth, pour pile cap;Eleventh, backfill foundation pit, twelfth, tie pier body reinforcement, pour pier body, prefabricated plate beam, erect plate beam;The present application is by continuing to dig operating area in the bottom surface of foundation pit, and support first formwork around pile foundation, so that pile cap pouring can form convex section, and nest below the bottom surface of foundation pit, support second formwork and third formwork make pour pier body form insertion part, and nest below the upper surface of pile cap, so that the connection of pile foundation and pile cap, pile cap and pier body can better withstand lateral load, enhance the overall structural strength.

The application relates to the technical field of foundation treatment of building engineering, and particularly discloses a composite foundation layered compaction replacement construction method, which ensures the stability of a foundation bottom through dynamic deepening and foundation bottom treatment, strengthens quality control in combination with a test groove, optimizes material distribution and constraint structures through partition constraint layered backfill, forms a stepped working face to improve the continuity of construction in multi-elevation areas, enhances the bearing capacity of key areas through high-strength backfill around the structure, guarantees the compactness of a large area through final backfill and compaction, and realizes overall quality confirmation through foundation bearing capacity verification. The application effectively solves the problems of poor construction process coordination, low material utilization efficiency, non-precise quality control, limited construction efficiency, high environmental cost and the like.

The invention relates to the field of mine pit treatment, and particularly discloses a waste mine pit recovery treatment method which comprises the following steps: geological disaster prevention and treatment, one or more treatment of slope cutting, danger clearing, anchoring or retaining wall supporting on an unstable slope of a pit wall area to form waste slag and waste rocks, and stacking part of the waste slag and waste rocks in a slag top area; slope treatment is conducted, specifically, step-by-step slope making is conducted through the excavation slope ratio of 1: 1.25-1: 2, and step-by-step slope making is formed; performing land reclamation and construction to form a retaining wall, a drainage ditch and a slope safety isolation net; covering surface soil, and covering external soil with soil; vegetation recovery; and monitoring, managing and protecting. According to the scheme, when geological disaster prevention and treatment and side slope treatment are carried out, the pit wall area is sequentially constructed, comprehensive slope cutting and danger removing treatment can be carried out on the unstable side slope, stepped slope forming can be sequentially carried out, the final stepped slope forming strength is improved, and the follow-up collapse and landslide danger is reduced.

The invention provides a large-flow-state coal-based solid waste filling material as well as a preparation method and application thereof, and belongs to the technical field of building materials. The coal ash and the coal cinder are rich in silicon and aluminum components and can be compounded with the aeolian sand to prepare a large-flow-state material, the cohesiveness can be improved by exciting the gelatinization activity in a synergistic utilization mode, the framework effect of the aeolian sand and the coal cinder can be achieved, the shrinkage crack risk is effectively reduced, and the anti-cracking performance is improved. And a feasible path is provided for solid waste recycling and efficient utilization of the aeolian sand. According to the invention, coal-based solid wastes (fly ash, coal cinder and gypsum), aeolian sand and cement are used as main raw materials, and a water reducing component, a retarding component, an air entraining component and an expansion component are added; the large flow state, low shrinkage and good durability of the material are achieved through a gel system (low cement-high fly ash-gypsum synergistic excitation), aggregate grading (coal cinder-aeolian sand proportion control) and functional additive compounding, and an innovative solution is provided for bridge abutment back backfilling in cold regions.

The application belongs to the field of building, and particularly discloses a connecting method for connecting a new dam and an old dam in extension of a garbage dam, which first reinforces the old dam body to form a reinforced part; the method comprises the following steps: (1) constructing a steel flower pipe-steel pipe-reinforced geotextile system; (2) constructing a pile anchor system; then constructing an increased part above the reinforced part and the old dam body to form a new dam body. The connecting method for connecting the new dam and the old dam in extension of the garbage dam can not only improve the anti-sliding force of the potential sliding surface of the old dam body, but also can enhance the connection between the new dam body and the old dam body, and improve the common working performance and the coordinated deformation capacity of the two, so as to achieve the purpose of in-situ expansion.

According to the deeply-buried underground pipeline backfilled with the flow-state solidified soil and the construction method, combined supporting of the steel sheet piles, the full-length steel waist beams and the inner supports is adopted, a reliable supporting system which is high in rigidity and small in deformation is provided for a deep narrow groove, the construction safety of a foundation pit is greatly improved, displacement of surrounding soil is effectively controlled, adjacent buildings and pipelines are protected, and the construction period is shortened. Meanwhile, the supporting period can be remarkably shortened through assembly construction; groove foundation pit combined supporting is adopted in the influence range of an existing pipeline, and for a sensitive area adjacent to the existing pipeline, through refined and differentiated supporting combination, the excavation safety of a deep groove is ensured, and meanwhile additional stress and disturbance generated by construction to the existing pipeline are reduced to the maximum extent; the integrated protective shed is adopted to achieve integration and mechanization of backfilling and maintenance procedures, it is ensured that the fluid solidified soil is condensed and hardened under the optimal condition, shrinkage cracks are avoided, the uniformity, the overall strength and the long-term water stability of a backfilling body are guaranteed, and the construction quality and efficiency are greatly improved.

The invention provides an aeolian sand filler layered compaction construction method which comprises the following steps: base treatment and primary compaction: digging out a soil layer and vegetation with a preset depth in a dike base range to obtain a foundation pit, backfilling the foundation pit to a preset height by using aeolian sand, and carrying out primary compaction; paving the improved filler, namely paving the improved filler on the base platform to form a main body filling layer with a flat surface; the grid water storage comprises the steps that improved filler is piled and filled on the main body filling layer to construct a plurality of sand ridges to form grids, and water is injected into each grid; the three-stage rolling compaction comprises the following steps: sequentially carrying out pressure stabilization, vibration compaction and final compaction on the main body filling layer after the grid water storage to form a compact embankment layer; and compaction degree detection comprises the steps of carrying out compaction degree detection on the dense embankment layer, supplementing pressure when the compaction degree is unqualified, entering the next layer of improved filler paving until the compaction degree is qualified, and trimming a slope and paving a protective layer after paving to a designed elevation. After the scheme is implemented, an embankment body project is reliable in quality and stable in performance.

The utility model relates to a pine pile cofferdam structure which comprises a plurality of pine pile rows, a reinforcement cage is installed on the lower portion of one pine pile row, a concrete fixing table is poured on the outer sides of the pine pile rows and the reinforcement cage, the pine pile rows are driven into a river bottom to form a double-layer wall body, and the bottom of the concrete fixing table makes contact with the river bottom. A U-shaped first geogrid layer is arranged on the inner side of the wall body, a first waterproof membrane cloth layer is arranged on the inner side of the first geogrid layer, a second waterproof membrane cloth layer is arranged on the inner side of the first waterproof membrane cloth layer, the second waterproof membrane cloth layer is filled with filler, and a plurality of second geogrid layers are laid in the filler from bottom to top. Fixing assemblies are arranged on the upper portions, located on the water surface, of the pine pile rows, fixing sleeves are arranged on the tops of the pine pile rows, and every two adjacent pine pile rows are fixedly connected through the fixing assemblies and the fixing sleeves. The waterproof box is good in strength and stability, good in waterproof effect and convenient to use.

This application provides a multi-level collaborative reinforcement method and structural system for the disturbed zone of collapsible loess foundation. The method includes: removing loose soil from the disturbed zone; setting up an anti-seepage wall at the edge of the disturbed zone; backfilling the disturbed zone with reinforcing material and compacting it in layers to form a foundation replacement reinforcement layer; excavating a single-foundation pit on top of the foundation replacement reinforcement layer; laying buffer material at the bottom of the single-foundation pit; laying a single-foundation steel reinforcement cage in the single-foundation pit and anchoring the single-foundation steel reinforcement cage to the reserved steel bars on the existing retaining wall; and pouring concrete into the single-foundation pit to form a single foundation. The anti-seepage wall, in conjunction with the foundation replacement reinforcement layer, forms an anti-seepage and drainage system, achieving the effect of blocking capillary water rise from the source and ensuring smooth drainage, thereby eliminating the risk of collapsible loess collapsing when exposed to water. The foundation replacement reinforcement layer adopts a replacement process of layered backfilling and alternating compaction, achieving the effect of a high-bearing-capacity, low-compressibility foundation reinforcement layer.

The invention belongs to the technical field of tunnel engineering TBM construction, and particularly discloses a layered backfill reinforcement method under the uncovered working condition of a TBM starting end, and the method comprises the following steps: carrying out regional collaborative backfill by adopting concrete and dense clay to form a flexible bearing layer, and sequentially connecting the flexible bearing layer with a ground road; performing height-limited backfilling on the flexible bearing layer to form a flexible buffer transition layer; a transition sequential connection area is arranged at the joint of the TBM starting end backfill area and the existing municipal road; and quality detection is carried out to ensure that design requirements are met. According to the layered backfill reinforcement method for the TBM starting end under the non-earthing working condition, through the layered design of rigid supporting, flexible buffering and gradual change sequential connection, the requirements for stratum stability and TBM cutter head cutting under the non-earthing working condition are met, the influence of additional loads and sedimentation on municipal roads is avoided, construction and operation safety is guaranteed, and the construction period is shortened. The method can be suitable for complex terrain conditions of an urban rail transit TBM starting end, and is high in practicability.