63 results about "Soil nailing" patented technology

The application discloses a kind of segmented excavation construction methods combined with soil nailing wall support, belong to foundation pit support technical field, solve the technical problem that existing segmented excavation is difficult to control, and the safety risk caused by the sudden change of stress of supporting structure is caused by foundation pit deformation.It includes: dividing N excavation layers, setting each layer excavation depth and soil nail length;Layer by layer excavation, construction soil nail and shotcrete surface layer, and install displacement sensor and axial force sensor at the end of soil nail;After reaching the preset strength, read the cumulative horizontal displacement, current displacement rate and axial force increment;Compare with preset threshold respectively, if any is out of limit, then reduce the next layer excavation depth and increase the soil nail length, otherwise, construction according to original design parameters;Repeat until all excavation layers and support are completed.The application is mainly used for the segmented excavation construction of foundation pit in soft or sensitive stratum, can dynamically adjust the support parameters according to real-time monitoring data, effectively control the deformation of foundation pit, and improve the safety and adaptability of construction.

The utility model relates to the technical field of soil nailing walls, in particular to a soil nailing wall supporting structure which comprises a foundation pit, a drainage ditch is formed in the bottom end of the foundation pit in a penetrating mode, a filter screen is arranged at the top of the drainage ditch, a sliding groove is formed in the side, close to the top of the filter screen, of the drainage ditch, and a sliding block is arranged in the sliding groove. A scraping plate is fixedly mounted on the side, close to the filter screen, of the sliding block, the bottom of the scraping plate makes contact with the top of the filter screen, and a connecting plate is fixedly mounted on one side of the sliding block; according to the scheme, the scraping plate is arranged, impurities on the filter screen can be regularly removed, it is ensured that the filter screen keeps good drainage performance all the time, the problem of unsmooth drainage caused by blockage is solved, the complexity and frequency of maintenance of the soil nailing wall are reduced, and therefore the whole supporting structure is stabilized; the service life of the filter screen can be greatly prolonged, the frequency and cost of replacing the filter screen are reduced, the maintenance cost is reduced, and the working efficiency is improved.

The utility model provides a soil nail steel sheet pile composite supporting device suitable for a deep foundation pit. The soil nail steel sheet pile composite supporting device comprises a steel sheet pile assembly; the sleeve is arranged on one side of the steel sheet pile assembly; the soil nail assembly is arranged in the casing pipe; the gasket is arranged on the outer side face of the soil nail assembly in a sleeving mode; the nut is in threaded connection with the outer side face of the soil nail assembly. According to the soil nail steel sheet pile composite supporting device suitable for the deep foundation pit, the installation ring, the connecting ring, the installation frame, the sliding rod, the spring, the baffle, the check ring, the penetrating groove and other structures are matched with one another, after grouting is completed, elasticity of the spring can push the baffle, and therefore the baffle blocks the penetrating groove, and the soil nail steel sheet pile composite supporting device is convenient to use. In this way, slurry entering the soil nail assembly can be prevented from flowing out, and the grouting effect of the soil nail assembly is improved.

The invention discloses a narrow site working condition deep foundation pit supporting system and a construction method thereof.The narrow site working condition deep foundation pit supporting system comprises a pouring pile and a composite soil nailing wall, the composite soil nailing wall is arranged on the top of the pouring pile, a steel bar mesh is arranged on the top of the pouring pile, a plurality of steel bar soil nails are arranged on one side of the steel bar mesh, and the steel bar mesh is fixed through the steel bar soil nails; a steel pipe inclined support is arranged on one side of the pouring pile, a bottom plate is arranged on one side of the pouring pile through concrete pouring, a counter-force pier is arranged on one side of the bottom plate, and the steel pipe inclined support is fixed through the counter-force pier; the composite soil nailing walls and the steel pipe inclined supports are arranged, and the multi-aspect construction mode of the composite soil nailing walls, the cast-in-place piles and the inclined supports is adopted during construction, so that construction of supporting of the deep foundation pit in the narrow and small site is achieved under the working condition of the narrow and small site under the condition of not occupying a municipal road protection underground pipe network.

The utility model belongs to the technical field of foundation pit supporting engineering construction, and particularly relates to a soil nail reinforcing device for a composite soil nail wall supporting system. The fixing parts are linearly arrayed on the side wall of the soil nail in the central axis direction of the soil nail; the positioning clamp is arranged between the fixing parts and is connected with the fixing parts; and the fixing part is tightly held on the side wall of the soil nail through the annular clamp. The soil nailing wall supporting structure solves the problems that due to the fact that an existing soil nailing wall supporting structure adopts the mode that a positioning clamp is welded to a soil nail, the problem that the positioning clamp falls off due to the fact that a welding seam is not fused exists, the engineering quality of a composite soil nailing wall supporting system is affected, and serious potential quality hazards are caused.

This invention belongs to the field of geotechnical slope engineering technology, and provides a prefabricated slope soil nailing pipe based on self-circulating heat exchange technology and its construction method. The pipe includes a soil nail shell; a heat exchange assembly, which is disposed inside the soil nail shell and includes a thermosiphon rod and a heat exchange mechanism. The thermosiphon rod is located at the bottom of the soil nail shell, and the heat exchange mechanism is connected to the thermosiphon rod. The heat exchange mechanism absorbs and releases the heat transferred by the thermosiphon rod outward through the soil nail shell. A gravity-promoting drive component is installed inside the heat exchange mechanism to accelerate the flow of the heat exchange medium within the mechanism, ensuring heat exchange between the soil nail shell and the heat exchange mechanism even when the shell is not vertical; and a heat dissipation assembly, which is disposed inside the soil nail shell and connected to the heat exchange mechanism. The heat dissipation assembly releases the heat dissipated by the heat exchange mechanism into the air. This invention can provide stable support for slopes in cold regions and frozen soil beneath the slope.

The utility model discloses an anchoring steel bar for supporting a soil nailing wall, and relates to the technical field of soil nailing wall construction. The anchoring steel bar comprises an anchoring steel bar body, one end of the anchoring steel bar body is rotationally provided with a reverse buckling steel bar, the anchoring steel bar body is further provided with a buckle steel plate in a sliding mode, and the buckle steel plate corresponds to the reverse buckling steel bar. And the buckle steel plate moves towards the direction of the reverse buckle steel bar, so that the reverse buckle steel bar is rotated and opened until the reverse buckle steel plate is matched with the buckle steel plate for limiting, and the reverse rotation of the reverse buckle steel bar is avoided. The anchoring steel bar has the advantages that the rotatable reversely-buckled steel bars are arranged on the anchoring steel bar body and matched with the buckle steel plates arranged in a sliding mode, an effective locking mechanism is formed, and when the buckle steel plates move towards the reversely-buckled steel bars and are clamped, the reversely-buckled steel bars can rotate to be opened and are firmly inserted into the soil body; the connection strength and the overall stability between the anchoring steel bar and the soil body are remarkably enhanced, and the steel bar is effectively prevented from loosening or being pulled out of the soil body.

The utility model relates to the technical field of soil nailing walls, and discloses a soil nailing wall supporting assembly which comprises an overturning plate, an adjusting assembly is arranged on the outer side of the overturning plate and used for adjusting the angle according to conditions, and sliding assemblies are arranged on the inner sides of the two ends of the adjusting assembly and used for adapting to different soil nailing positions. The adjusting assembly comprises an adjusting nut, and the adjusting nut is located on the inner side of the overturning plate. According to the soil nailing wall supporting assembly and the soil nailing wall, the adjusting assembly is installed, a mounting position can be provided for the structure on the outer side through a turnover plate, an adjusting nut on the inner side can control an adjusting screw rod to rotate synchronously through rotation, and the adjusting screw rod drives an adjusting plate to move in the rotating process; and after moving, the width of the foundation pit platform can be adjusted to meet different requirements, after adjustment, the protruding guide insertion rods can be directly inserted into the soil nailing wall, and the flexibility is greatly improved to use different soil nailing walls.

The invention relates to the technical field of building construction, in particular to a foundation pit supporting structure in an ultra-deep sludge state and an earth excavation construction method.The foundation pit supporting structure in the ultra-deep sludge state comprises a foundation soil nailing wall, the foundation soil nailing wall comprises a slope surface and a platform surface, a single-shaft stirring pile waterproof curtain is arranged below the platform surface, and a reinforcing soil body is arranged below the single-shaft stirring pile waterproof curtain at the bottom; a positioning ring is arranged on the top surface of the platform surface; the construction method has the beneficial effects that the positioning ring is arranged on the platform surface, and the inner ring opening of the positioning ring definitely defines an area in which the single-shaft stirring pile is required to be constructed as the water cut-off curtain. The conical heads fixed to the bottom face of the lifting ring penetrate through the bottom plate of the positioning ring and then are inserted into the surface of the platform face, the positioning ring is firmly limited to the platform face, displacement of the positioning ring in the construction process is effectively avoided, and therefore precise fixed-point limiting of the single-shaft stirring pile serving as a water cut-off curtain in construction is achieved; the construction quality of the water cut-off curtain is guaranteed, and the waterproof performance of the foundation pit is improved.

This invention provides a method for microbial soil nailing slope reinforcement based on microbial-induced calcium carbonate precipitation, belonging to the field of geotechnical engineering technology. The invention involves drilling holes in the slope surface and filling these holes with calcareous sand. A slurry containing urease-producing bacteria is injected into the calcareous sand-filled holes, and the mixture is allowed to stand. Then, a cementing liquid is injected to induce microbial calcium carbonate precipitation, resulting in a microbial soil nailed slope reinforcement. This invention creatively combines MICP technology with soil nail structure, using MICP technology to replace traditional cement grouting. This generates calcium carbonate crystals that cement the calcareous sand and surrounding soil, reducing the swelling and shrinkage of expansive soil under rainwater conditions. It inhibits slope surface collapse under alternating wet and dry conditions and reduces the possibility of shallow landslides during these processes. Simultaneously, it improves the shear strength and pull-out resistance of the nail-soil interface, reducing environmental pollution.

The utility model relates to a convenient connecting device for a soil nail grouting pipe, which comprises an inner pipe, an outer pipe and a connecting device, the inner pipe is hermetically connected in the outer pipe through the connecting device, and the connecting device comprises an extrusion nut, an extrusion ring, a limiting table and a sealing sleeve; a limiting table protruding outwards is arranged at the bottom of the inner pipe, the sealing sleeve is of a deformable structure, the inner pipe is sleeved with the sealing sleeve, the sealing sleeve is located on the limiting table, and the inner pipe is sleeved with the extrusion ring in a sliding mode, and the extrusion ring is located on the upper portion of the sealing sleeve. An external thread section is arranged on the upper portion of the inner pipe, and the extrusion nut is connected to the external thread section in a threaded mode and located on the upper portion of the extrusion ring so as to exert acting force on the extrusion ring from the upper portion, so that the sealing sleeve deforms. The grouting pipe is simple to operate, easy to connect and disassemble, reliable in connection and not easy to loosen, and ensures the safety of construction workers, and the bearing pressure of the grouting pipe is ensured.

This invention discloses a construction method for soil nailing walls used in geological disaster control, relating to the field of geological disaster control technology. The method includes: S1, environmental survey and construction design; S2, bottom layer spraying and drilling; S3, moisture-proofing treatment of the holes; S4, soil nail placement and grouting; S5, installation of reinforcing mesh and drainage pipes; and S6, concrete surface spraying. This construction method for soil nailing walls not only includes drainage pipes for drainage but also provides moisture-proofing treatment for the holes. A steel mesh cylinder is placed inside the holes and coated with prepared diatomaceous earth. This improved construction process not only drains water that accumulates in the soil layer but also absorbs moisture from the inner walls of the holes. Combined with the isolation effect of the waterproof layer, it prevents the reinforced soil nails from being in a damp environment for extended periods, thus preventing corrosion and peeling of the protective layer on the soil nail surface. This reduces soil nail corrosion, lowers maintenance and replacement costs, and maintains the structural stability of the original soil nailing wall, improving the slope reinforcement effect.

The utility model provides a pre-stressed anchor rod composite soil nail wall supporting structure which comprises a net hanging concrete layer, a retention wall, soil nails and pre-stressed anchor rods, the retention wall is arranged on the top of a side slope, the bottom of the retention wall is connected with a net hanging guniting layer, a net hanging concrete layer is arranged on the surface of the side slope, and the soil nails and the pre-stressed anchor rods are evenly distributed on the net hanging guniting layer. The slope of the slope protection is 1: 0.5, the inclination angle of the soil nail is 15 degrees, concrete with the thickness of 80 mm is sprayed on the surface of the net hanging concrete layer, the inclination angle of the pre-stressed anchor rod is 15 degrees, channel steel is arranged on the two sides of the pre-stressed anchor rod, the middle of the channel steel on the two sides is connected with a steel plate, and the pre-stressed anchor rod is locked on a steel base plate on the top of the channel steel through a high-strength screw cap and fixed in a slope soil body through a centering support. The pre-stressed anchor rod composite soil nailing wall supporting structure is high in stability, high in bearing capacity and low in overall cost.

The utility model relates to resource and environment technical field, specifically disclose an ecological revetment device for resource and environment technology, including the revetment mechanism that is located on the revetment body, the revetment mechanism includes revetment base layer, is constituted by the steel mesh frame that crisscrosses vertically and horizontally, the concrete beam that is poured on the steel mesh frame and the soil nail that is anchored in the revetment body and is penetrated through concrete beam and steel mesh frame, mortar rubble protection layer is located revetment base layer outside, the top of mortar rubble protection layer extends and forms the protection eave that is higher than the top of revetment body, the protection eave top is equipped with the water collecting tank of arc shape, the water collecting pipe that is parallel with the slope surface of revetment body is in the inclinedly buried of mortar rubble protection layer multiple, this ecological revetment device passes through dynamic drainage and planting linkage system and modularization anti -skidding planting structure, has realized the efficient discharge of slope runoff and the synergic rainwater resource utilization, has strengthened the three -dimensional anti -skidding stability of planting unit simultaneously, has improved the ecological benefit and engineering safety of revetment significantly.

The application discloses a kind of slope support construction methods, it is related to slope support technical field.The slope support construction method includes that earthwork is excavated, reduces current elevation and forms first slope;Column slab wall construction is carried out on the first slope;Earthwork is excavated to the reserved platform elevation in layers, and the reserved platform is used for subsequent construction support pile;With first slope rate, the earthwork of the end of reserved platform away from the column slab wall is excavated in layers and is made to form second slope, and uses composite soil nailing wall to temporarily support the second slope;With second slope rate, the earthwork of the side of second slope away from the reserved platform is excavated in layers and is made to form third slope and foundation pit;Support pile is constructed at reserved platform;Second slope is excavated to planned road surface design elevation in layers.The slope support construction method of the application can effectively shorten construction period and improve construction efficiency.

The utility model relates to the technical field of foundation pit excavation slope supporting, in particular to an openable soil nail which comprises a rod body and an opening assembly installed on the rod body. A conical head is mounted at one end of the rod body; the diameter of the conical head is greater than that of the rod body; the opening assembly comprises an installation block arranged on the rod body in a sleeving mode and a plurality of fan blades installed on the installation block, and the multiple fan blades are arranged around the conical head and clamp the conical head in the center. The problem that the anchoring depth is not enough due to the fact that the slope gradient is large and is close to a red line can be effectively solved, meanwhile, the anchoring strength is improved, the number of soil nails used by a slope is reduced, and the purposes of reducing cost and saving steel are achieved.

The invention discloses a slope protection soil nail mechanical hammering installation tool in the technical field of slope protection engineering application tools, and the slope protection soil nail mechanical hammering installation tool comprises a hammering rod and a hammering head, and further comprises a clamping assembly, and the clamping assembly pushes a clamping piece of the clamping assembly through hydraulic oil to clamp the hammering head; the liquid storage assembly is used for injecting hydraulic oil into the clamping assembly or receiving the hydraulic oil discharged by the clamping assembly; the valve assembly is used for cutting off hydraulic oil circulation between the liquid storage assembly and the clamping assembly; hydraulic oil is used for pushing the clamping piece to clamp the hammering head, then the hydraulic oil is cut off, the volume of the hydraulic oil is fixed, the hydraulic oil serves as a part of clamping and supporting the hammering head, and no gap is generated between the hammering head and the clamping piece after clamping; therefore, the risks that in the using process, the hammering head shakes relative to the clamping piece, the hammering head and the clamping piece move relative to each other, abrasion is caused, finally, the strength of components is reduced, and the components are directly cracked in the working process are avoided.

The utility model discloses a cantilever type side wall self-stabilizing system applied to deep foundation pit supporting, which comprises two waterproof curtains, a supporting pile, a concrete protection slope and an underpass channel box culvert, a plurality of soil nails are arranged in the concrete protection slope, a top beam is arranged at the top of the supporting pile, and a wet lean concrete layer is arranged on the inner side of the supporting pile. A plurality of columns of additional supporting steel bars arranged at intervals are arranged in structural steel bars of the underpass channel box culvert, the underpass channel box culvert comprises an underpass channel bottom plate, an underpass channel top plate and two underpass channel side walls, one ends of the additional supporting steel bars are inserted into the underpass channel side walls, and the other ends of the additional supporting steel bars penetrate through vertical side wall sections of the underpass channel bottom plate. The side wall panel is arranged on the transverse bottom wall section of the underpass channel bottom plate and is bent and inserted into the transverse bottom wall section of the underpass channel bottom plate so as to ensure the bending bearing capacity of the underpass channel bottom plate, so that a switching support structure in the prior art can be replaced, the pressure intensity of the side wall panel is small, the rigidity and the shock resistance of the whole structure are improved, and the construction period can be obviously shortened.

The invention discloses an anti-disintegration arc-shaped soil nailing wall supporting device and a construction method.The anti-disintegration arc-shaped soil nailing wall supporting device comprises two oppositely-arranged soil nailing wall bodies, a plurality of cross beam assemblies are arranged on the soil nailing wall bodies, each cross beam assembly comprises a plurality of cross strip sets, and each cross strip set is formed by hinging a plurality of cross strip blocks; each soil nailing wall body is provided with a plurality of transverse strip sets in the vertical direction. A vertical beam is connected to the transverse strip block in an inserted mode, and a fixing mechanism is arranged between the transverse strip block and the vertical beam. The fixing mechanism comprises an inserting groove formed in the transverse strip block, a round opening is formed in the inserting groove, a plurality of hollow fixing columns are arranged on the vertical beam, the fixing columns are inserted into the soil nailing wall body through the round opening, a plurality of fixing openings are formed in the fixing columns, and the fixing openings are used for installing inserting columns in the locking device. A mounting plate and a supporting assembly are arranged between the two soil nailing wall bodies. The problems that a supporting structure cannot form a uniform stress system, and a complex curved surface is difficult to flexibly adjust are solved.

The utility model discloses an adjustable assembly type high pressure grouting soil nail of grouting range, including the coaxial line setting grouting outer tube and grouting inner tube, one end of grouting inner tube stretches into grouting outer tube, and the other end extends away from grouting outer tube, adopt threaded connection between grouting inner tube stretch into grouting outer tube part and grouting outer tube, the pipe wall of grouting inner tube is arranged with grouting hole, the outer baffle ring of end face of grouting inner tube is sleeved with grouting outer tube, and one end of grouting inner tube not stretching into grouting outer tube is equipped with the inner baffle of closing pipe orifice. The soil nail makes the internal formation closed chamber to the orifice prepositioned on the soil, causes to make grouting when can pressurize, accelerates the grouting speed, can make the grout infiltration into the soil rate to improve, and the combination strength between the soil after solidification is higher, and the overall function is perfect, and the practicality is strong.

The utility model discloses a soil nailing wall supporting structure suitable for a foundation pit around an existing underground structure, which belongs to the technical field of foundation pit supporting and comprises a first supporting assembly and a second supporting assembly. The first supporting assembly comprises a plurality of first soil nails extending in the first direction, one end of each first soil nail is arranged on the top end face of a soil layer around the foundation pit, and the other end of each first soil nail is nailed into the soil layer around the foundation pit; a connecting beam is arranged between the two first soil nails; the second supporting assembly comprises second soil nails, one end of each second soil nail is arranged on the slope surface of the foundation pit slope, and the other end of each second soil nail extends towards the existing underground structure. The soil nailing wall supporting structure suitable for the foundation pit on the periphery of the existing underground structure can adapt to the situation that other buildings exist on the periphery of the foundation pit, it can be guaranteed that a slope body of the foundation pit is stably and effectively supported, the excavation depth of the foundation pit is increased, the engineering cost of foundation pit slope supporting can be reduced, and the construction period of the foundation pit slope supporting can be shortened.

The utility model provides a kind of green assembly type soil nail wall slope protection surface course, including hot melt adhesion skin layer, protective material layer, honeycomb reinforced layer and performance material layer, the protrusion of the honeycomb reinforced layer is equipped with and is inlayed connection of the protective material layer and the skin layer is penetrated described, the utility model is inlayed connection by the protrusion of honeycomb reinforced layer and is penetrated protective material layer and skin layer, form three-dimensional connection, reduce porosity, reduce interlayer sliding, improve interlayer bonding force, ensure that it keeps close when slope settlement, improve durability.

This utility model discloses a measuring device for the ultimate frictional strength of the soil nail-soil interface, including an experimental chamber, a first support frame, a second support frame, and a computer. The experimental chamber contains a sensor assembly and a pre-embedded steel pipe arranged obliquely and removable. The upper end of the pre-embedded steel pipe is located outside the experimental chamber, and the interior of the pre-embedded steel pipe is used to insert reinforcing bars. The first support frame has a vertical force application mechanism and a water spraying mechanism above the experimental chamber. The vertical force application mechanism is used to compact the soil placed inside the experimental chamber, and the water spraying mechanism is used to spray water into the experimental chamber. The second support frame has a pull-out mechanism and a horizontal force application mechanism. The pull-out mechanism is used to pull the pre-embedded steel pipe out of the experimental chamber, and the horizontal force application mechanism is used to apply tension to the reinforcing bars. The computer is used to analyze the measurement data from the measuring device. Using the above device for experimental simulation can effectively solve the problem that existing technologies cannot realistically simulate actual engineering environments.

This invention provides a steel pipe soil nail anchor bolt for rapid penetration of weathered mudstone strata and its construction method. The anchor bolt includes: an anchor bolt body; a drill bit disposed at the drilling end of the anchor bolt body for breaking the weathered mudstone strata; an external drilling rig whose power output end is connected to the anchor bolt body for driving the anchor bolt body to rotate, thereby driving the drill bit to rotate and achieve drilling operations, forming an anchor bolt hole; and a casing fitted around the outer periphery of the anchor bolt body for supporting the hole wall during drilling. This invention utilizes the drill bit disposed at the drilling end of the anchor bolt body to rapidly break up weathered mudstone, quickly penetrating the weathered mudstone strata, saving construction time and ensuring the overall progress of the project; the casing disposed around the outer periphery of the anchor bolt body prevents hole collapse during drilling, ensuring the quality of the anchor bolt hole, and solving the problems of low drilling efficiency and easy hole collapse of existing anchor bolt drilling rigs in weathered mudstone strata.

The utility model relates to the technical field of anchor rods, and discloses a self-locking anchor rod for soil nailing wall construction, which comprises an anchor rod body, inner arc plates are sleeved on two sides of the anchor rod body, outer arc rods are placed on the outer sides of the inner arc plates, and two groups of inner arc plates and two groups of outer arc rods are arranged; a limiting groove is formed in the side, close to the inner arc plate, of the anchor rod body. Through the arrangement of the outer arc rod, the inner arc plate and the limiting block, the inner arc plate can be arranged on the outer side of the anchor rod in a sleeving mode, the limiting block is aligned with the limiting groove, the limiting block is inserted into the limiting groove, meanwhile, the convex block is inserted into the concave table, the bolt penetrates through the convex block, and the nut is screwed, so that the anchor rod can be centered when being inserted. The mode that one end of an anchor rod is sleeved can be avoided, and the installation efficiency of the center assembly can be improved.

This invention relates to a method for single-sided formwork construction of ultra-large volume concrete spans with varying elevations. The method includes the following steps: Step 1: Excavation and slope setting of the earthwork for the high and low spans; Step 2: Binding of steel mesh and installation of soil nails on the slope; Step 3: Shotcrete protection of the slope; Step 4: Base treatment and leveling of the slope; Step 5: Waterproofing layer construction; Step 6: Waterproofing protective layer construction; Step 7: Reinforcement binding of the raft foundation; Step 8: Pouring of concrete for the lower span raft foundation; Step 9: Single-sided formwork for the ultra-large "inverted triangle" concrete section of the high and low spans; Step 10: Pouring of the raft foundation concrete; Step 11: Curing; Step 12: Temperature measurement and monitoring. This invention solves the problems of waterproofing protection for raft foundations with varying elevations and the challenges of single-sided formwork for ultra-large volume concrete spans, reducing construction costs and saving construction time.

The application relates to a construction method of a prefabricated assembled circular well wall, which comprises the following steps: a, transporting the prefabricated well wall (1) to the site after prefabricating the well wall (1) in a factory; b, layer-by-layer excavation, digging to the depth of the first section of the prefabricated well wall (1), then arranging soil nails (5) along the circumference and anchoring; c, installing annular ribs (6); d, assembling the prefabricated well wall (1) into a ring shape, hanging the prefabricated well wall (1) on the horizontal annular ribs (6) and grouting; e, continuing to dig, connecting vertical ribs (7) with the annular ribs (6), then sequentially hanging the prefabricated well wall (1) on the annular ribs (6) and grouting; f, installing longitudinal connecting components (4) in longitudinal reserved holes (2) and grouting; g, continuing to dig, repeating e and f until completion; h, pouring a bottom plate (13). The structure is constructed layer by layer, the process is simplified, the construction speed is high, and the cost is low. The problems of long construction period, complex process, long exposure time of a foundation pit and high risk of the cast-in-place well wall structure construction method are solved.

The present application relates to a kind of slope excavation new anchor rod supporting system optimization method using residual anchor rod.The method includes: according to the geometry of slope and anchor rod layout, preliminary selection multiple different excavation slope angle excavation scheme;The excavation area and residual length of anchor rod of each scheme are calculated;Theoretical pullout ultimate bearing capacity of residual anchor rod is calculated based on soil nail theory;The numerical simulation model of slope stability considering and not considering the influence of residual anchor rod reinforcement is established using Midas GTS NX software, and the safety factor and anchor rod axial force distribution are calculated;By comparing the maximum axial force of residual anchor rod calculated by numerical simulation with the theoretical calculation pullout ultimate bearing capacity, the authenticity of numerical simulation safety factor is determined, and the true safety factor is sought;According to true safety factor, the shear strength parameter adjustment coefficient of rock and soil mass is calculated, the enhanced shear strength parameter of rock and soil mass is obtained, input into geotechnical engineering design software, and new support structure design is carried out;Finally, the scheme is compared in technology and economy, and the optimal scheme is selected.