188 results about "Soil nailing" patented technology

The invention relates to a method for optimizing a newly-built anchor rod supporting system for slope expanding excavation by using residual anchor rods. The method comprises the following steps: preliminarily selecting a plurality of excavation schemes of different excavation slope angles according to the geometrical morphology of the side slope and the layout of anchor rods; calculating the excavation area and the residual length of the anchor rod of each scheme; calculating the theoretical ultimate uplift bearing capacity of the residual anchor rod based on the soil nail theory; midas GTS NX software is used for establishing a slope stability numerical simulation model considering and not considering the influence of residual anchor rod reinforcement, and a safety coefficient and anchor rod axial force distribution are calculated; by comparing the maximum axial force of the residual anchor rod obtained through numerical simulation calculation with the ultimate uplift bearing capacity obtained through theoretical calculation, the authenticity of the numerical simulation calculation safety coefficient is judged, and the true safety coefficient is sought; calculating a rock-soil body shear strength parameter adjustment coefficient according to the true safety coefficient to obtain an enhanced rock-soil body shear strength parameter, inputting the enhanced rock-soil body shear strength parameter into geotechnical engineering design software, and designing a newly-built support structure; and finally, technical and economic comparison and selection are carried out on the schemes, and the optimal scheme is selected.

The invention discloses a hypha network reinforced ecological slope protection structure and a construction method.The hypha network reinforced ecological slope protection structure comprises a plurality of ecological soil nails arranged on a side slope, and each ecological soil nail comprises a soil nail head located outside the side slope; a hollow shell extending into the slope is arranged at one end of the soil nail head, a grouting hole communicated with the hollow shell is formed in the soil nail head, and a plurality of leakage holes are formed in the surface of the hollow shell; a plurality of ecological panels are arranged on the inclined face of the side slope, and the ecological soil nails are filled with grouting liquid with hypha spores. An assembly type structure frame is formed by inserting and matching the ecological panels and the ecological soil nails, grouting liquid with spore bags is injected, after the spore bags are activated, mycelium is combined in a winding mode in the growth process, and a high-ductility biological fiber network structure is constructed between soil particles and components. And the structural integrity and the shear resistance and disturbance resistance of the side slope are improved.

The invention relates to the technical field of foundation pit supporting, and discloses a large-area foundation pit supporting construction method.A reinforcing mesh is arranged on a slope on one side of a drainage ditch on the ground, soil nails are arranged on the reinforcing mesh, the reinforcing mesh is fixed through the soil nails, a concrete layer is sprayed to form shotcrete-anchor supporting, and a waterproof curtain is arranged on the surface of the lower end of the reinforcing mesh; row piles are arranged on the inner side of the waterproof curtain and adopt cast-in-situ bored piles as foundation pit fender posts, a soil body below a foundation pit excavation face on the inner sides of the cast-in-situ bored piles is reinforced to achieve passive area soil body reinforcement, a top beam is arranged at the upper ends of the cast-in-situ bored piles, a reinforcing pier is arranged on the inner side of the top beam, and a steel lattice inclined pile is arranged on the side, away from the top beam, of the reinforcing pier. According to the construction method of the large-area foundation pit support, after the steel lattice inclined piles are put down, the reinforcing pier construction reinforcing bars and the steel lattice columns at the tops of the steel lattice inclined piles are firmly fixed, and the top beams and the reinforcing piers are poured, so that the top beams, the reinforcing piers and the steel lattice inclined piles form an integral structure.

The invention relates to the technical field of side slope engineering, and discloses a side slope inter-pile soil nailing wall composite structure stress calculation method, device and equipment and a storage medium, and the side slope inter-pile soil nailing wall composite structure stress calculation method comprises the following steps: S100: analyzing the shape and size of an inter-pile horizontal soil arch; s200, calculating the load of the anti-slide pile; s300, the load of the soil nailing wall is calculated; and S400, according to the load of the soil nailing wall, a soil nailing anchoring section and a free section are divided. According to the stress calculation method for the soil nailing wall composite structure between the side slope piles, the influence of the soil arch effect on the stress of the soil nailing wall between the piles is considered, on one hand, the influence of the soil arch on the stress distribution of the anti-slide pile and soil nailing wall composite structure can be explained, on the other hand, the arrangement of soil nails can be optimized, and free sections and anchoring sections of the soil nails can be more accurately divided; therefore, construction is optimized, construction efficiency is improved, and construction cost is reduced.

The invention relates to the technical field of geotechnical engineering slope support, in particular to an anchor rod soil nailing wall slope support reinforcing mesh fixing method. According to the technical scheme, the method comprises the following treatment steps of 1, slope surface pretreatment, wherein a slope surface and a top slope surface are cleaned; 2, drilling positions are determined, specifically, drilling is conducted on the top slope surface and the slope surface; 3, anchor rod soil nails are installed, and a reinforcing mesh layer is laid; fourthly, U-shaped steel bars are mounted, wherein mounting holes allowing the U-shaped steel bars to be inserted are formed in the slope soil body, and the semicircular top face is exposed; fifthly, the reinforcing mesh layer and the U-shaped steel bars are bound and fixed, wherein horizontal bars and longitudinal bars of the reinforcing mesh layer are bound to the U-shaped steel bars; and 6, pouring of a surface layer. The U-shaped reinforcing steel bars are adopted for fixing and supporting the reinforcing mesh, the thickness of a protective layer of the reinforcing mesh and a slope soil body is effectively controlled, it is also guaranteed that the slope reinforcing mesh is located on the same plane, the overall stability of supporting is improved, the slope appearance after construction is good, and the construction safety performance is high.

The invention discloses a soil nailing and soilbag combined side slope protection system and a construction method thereof, relates to the technical field of side slope protection engineering, and aims to solve the technical problems that when a traditional soil nailing wall protection system is arranged, the surface of a side slope needs to be covered with a large amount of cement paste, and pollution is likely to be caused to the environment. The bag body is made of high-strength polyester fiber materials, the appearance of the bag body is a cuboid, and when the bag body is filled with soil, the total length of the bottom face is 1.5 m, the width is 0.4 m or 0.2 m, and the height is 0.2 m; the filler is slope in-situ soil, and the in-situ soil obtained through excavation is tamped and compacted; the soilbag unit is composed of a plurality of soilbags, each layer is composed of four standard soilbags 1 filled with aggregate and two standard soilbags 2 filled with aggregate, and each soilbag unit is provided with two layers of soilbags which are overlapped. According to the method, the slope can be supported without adding any concrete, and the method has the advantage of being good in environment-friendly performance.

The invention discloses a building construction foundation pit supporting structure and a supporting method thereof. The structure comprises a foundation, fender posts, water stop piles, supporting piles, a top beam, a waist beam, anchor cables, a slope protection concrete layer, a soil nailing wall concrete layer, a gravel cushion layer, a water suction pump, a water suction pipe, a well lid, a deepened bearing platform, a reinforced brick tire film and a well casing. The method comprises the steps of 1, field leveling; step 2, enclosure system construction; thirdly, a water stop system is constructed; fourthly, well point dewatering construction is conducted; 5, layered earth excavation is conducted; sixthly, a pit bottom cushion layer is constructed; the pit bottom multi-layer composite cushion layer structure is designed, the gravel cushion layer with the appropriate thickness is laid at the pit bottom so that redundant water can be rapidly removed, the foundation bearing capacity can be enhanced, then the reinforced thickened concrete cushion layer is additionally arranged on the gravel cushion layer, and the overall strength and rigidity of the cushion layer are improved through a reinforcing mesh or a fiber reinforced material; upper loads are effectively dispersed, and pit bottom soil is prevented from further extrusion deformation.

The invention relates to the technical field of positioning devices for building construction, and discloses a prestressed concrete pipe pile construction positioning device which comprises a fixing frame, a plurality of soil nails are fixedly connected to the bottom of the fixing frame, a plurality of lifting plates are slidably connected to the top of the fixing frame in a clamped mode, and a plurality of guide plates are arranged at the top of the fixing frame. An adjusting mechanism is arranged on the inner side of the fixing frame, a supporting mechanism used for bearing a welding gun is arranged on the inner side of the fixing frame, and the supporting mechanism comprises a lifting ring. The adjusting mechanism is matched with the guide plate for transmission to drive the guide roller to ascend before pile splicing, so that the guide roller is matched with the first electric push rod for positioning and centering of a pile body of a butt joint pile and moves synchronously with the pile body of the butt joint pile subsequently to be in butt joint with the pile body at the bottom, and therefore the height of the lifting ring is adjusted according to the height of the top face of the pile body at the bottom; the follow-up supporting blocks with the corresponding heights can assist in pile splicing operation, and the overall pile feeding efficiency and the pile pressing quality are improved.

The invention provides a soil nailing wall supporting structure and a foundation pit reinforcing method. The soil nailing wall supporting structure comprises a center rod, a centering support and a reinforcing mesh. The plurality of centering brackets are mounted on the center rod to form a soil nail rod; the centering supports are evenly arranged on the center rod and are symmetrically arranged in the axial direction of the center rod, so that the centering supports are in a shuttle shape. A plurality of anchor holes are formed in the soil nailing wall, and the diameter of the anchor holes is matched with the diameter of the centering support; a reinforcing mesh is arranged on the wall surface of the soil nailing wall; the reinforcing mesh and the center rod are fixedly connected through an L-shaped hook. Through the anchoring effect of the soil nails, the shear strength of the soil body is enhanced, and therefore the stability of the whole slope surface is improved.

The invention relates to the technical field of tunnels, and provides a tunnel portal section structure suitable for steep terrains and a construction method thereof.A steep rock-soil body is vertically excavated through an upward slope step by step, a soil nailing wall is adopted to support the upward slope while the upward slope is excavated from top to bottom, a box culvert main body, a stand column assembly and a joist assembly are constructed, and the tunnel portal section structure suitable for the steep terrains is constructed. And constructing portal walls and cover arches on the two sides of the tunnel by using the constructed adjacent span bridge, the box culvert main body and the joist assembly as a construction platform, constructing a pipe shed on the basis of the cover arches, backfilling in the second backfilling space to form a second backfilling layer, constructing a shed tunnel assembly, constructing a tunnel hidden hole, and completing the construction of the tunnel portal section structure. According to the double-layer frame structure, the foundation of an upper shed tunnel assembly can be provided, a channel is provided for an existing low-grade road on the lower portion, the double-layer frame structure is used for an adjacent bridge and a bridge abutment, meanwhile, the upper portion of the box culvert is backfilled to the top face of the joist, a construction platform can be provided for tunnel entering, the lateral soil pressure of a mountain can be resisted, and the construction safety is high.

The invention discloses a foundation pit mixed supporting structure and a construction method thereof, relates to the technical field of foundation pit supporting, and aims to solve the technical problems that in the prior art, all supporting parts are poor in collaboration, the due supporting effect is difficult to give full play, and the foundation pit collapse risk is high. Comprising a single-layer fulcrum structure in the form of adding a pre-stressed anchor cable to a common Larsen pile arranged on the side adjacent to a building. On the side adjacent to the structure, the Larsen steel sheet piles and the pre-stressed anchor cables achieve the synergistic effect, large lateral soil pressure can be borne, a solid foundation is provided for supporting, the foundation pit is prevented from deforming towards the structure, the soil nailing wall reinforces the soil body above the bottom elevation of the shallow foundation, and the integrity and the anti-sliding capacity of the side slope soil body are enhanced. By means of the improved construction technology, it can be ensured that all parts fully play roles, the foundation pit collapse risk is effectively reduced, and the surrounding structure and construction safety is guaranteed.

Method and apparatus for enhancing capacity of piles and / or anchors, which can include any type of piles and / or anchors, including but not limited to micropiles and soil nail, by disposing a tube or casing into the earth and then laterally expanding at least a portion of the casing, in plastic deformation, using an expansion member such that an enlarged area is formed in the casing. The casing can then optionally be left in place and filled with a filler material and / or can optionally be forcibly pulled out of the ground, thus compacting and thereby densifying the surrounding soil, and the thusly formed enlarged hole can be filled with a filler material and used as an anchor and / or pile. Optionally, in one embodiment, existing piles and / or anchors can be re-used by lowering an expansion member into them and creating one or more laterally expanded areas.

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 application discloses a cantilever type side wall self-stabilizing system applied to deep foundation pit support and a construction method thereof, which comprises two water-stopping curtains, support piles, concrete slope protection, a plurality of soil nails arranged in the concrete slope protection, a corbel arranged at the top of the support piles, and a wet lean concrete layer arranged at the inner side of the support piles, further comprises a box culvert of a lower passageway, a plurality of rows of additional support steels arranged at intervals are arranged in the structural steel of the box culvert of the lower passageway, and the box culvert of the lower passageway comprises a lower passageway bottom plate, a lower passageway top plate and two lower passageway side walls; one end of the additional support steel is inserted into the lower passageway side wall, the other end of the additional support steel is arranged through the vertical side wall section of the lower passageway bottom plate, and is bent and inserted into the horizontal bottom wall section of the lower passageway bottom plate, so as to ensure the bending bearing capacity of the lower passageway bottom plate; thus, the existing technology of the inverted support structure can be replaced, the pressure of the side wall panel is smaller, the rigidity and the anti-seismic capacity of the overall structure are improved, and the construction period can be obviously shortened.

The invention relates to the technical field of supporting structures, and discloses a foundation pit supporting structure construction method which comprises the following steps: S1, supporting structure design and model selection; a three-dimensional model of a supporting assembly is constructed through the BIM technology, the spatial layout and size parameters of components such as a base plate and anchor rods are optimized, visual construction simulation and error control are achieved, and a supporting form is selected according to the grade of a foundation pit; and S2, a supporting structure is installed, specifically, base plates with preset drainage holes are installed on the two opposite sides of the side wall of the foundation pit, the length of a fixing rod is adjusted through a first rod body and a second rod body which are in sliding connection, reverse locking is achieved through a locking piece, and the two ends of the fixing rod are connected with the base plates. The slope stability and the surrounding environment deformation are effectively controlled by adopting the combination form of the row pile support, the soil nailing wall and the like, intelligent design, modular construction and precise monitoring are fused, the method is suitable for medium-deep foundation pit engineering, and efficiency and safety are both considered.

The utility model discloses a fabricated soil nailing wall supporting structure, and belongs to the technical field of soil nailing walls, the fabricated soil nailing wall supporting structure comprises a foundation pit body, a flexible layer is laid on the slope surface of the foundation pit body, a plurality of groups of supporting mounting cavities are formed in the flexible layer, and supporting mounting cavities are fixedly mounted in the supporting mounting cavities; supporting panels are fixedly installed in the positions, located at the multiple sets of supporting installation cavities, of the interior of the flexible layer, penetrating holes are formed in the middles of the supporting panels, corresponding inserting holes are formed in the positions, located on the two sides of the penetrating holes, of the two side walls of the flexible layer, and detachable steel bar structures are inserted in the positions, located at the penetrating holes, of the interior of the flexible layer. The multiple sets of supporting panels are installed in the flexible layer, the multiple sets of supporting panels can be conveniently and integrally installed and disassembled, construction is convenient and fast, meanwhile, the flexible layer is made of civil engineering cloth, the flexible layer can be conveniently rolled up after being disassembled and can be conveniently transported to the next place to be recycled, and the use of materials is greatly saved.

The utility model discloses a tunnel support steel arch anti-sinking device based on a soft soil stratum, which comprises a tunnel, a plurality of steel arches which are longitudinally distributed at intervals are erected on the inner wall of the tunnel, anti-sinking devices are arranged at the lower ends of the two sides of each steel arch, each anti-sinking device comprises a micro pile arranged between the adjacent steel arches, and the micro piles are arranged on the inner wall of the tunnel. The miniature piles are inserted into a tunnel rock stratum, a plurality of soil nail rods are inserted into the side wall of the tunnel rock stratum from the side face of each miniature pile, the lower ends of the soil nail rods are obliquely inserted into the side wall of the tunnel rock stratum at equal intervals in the vertical direction, and the upper ends of the soil nail rods are all sleeved with oblique top plates. According to the anti-sinking device, the composite soil nailing wall structures are constructed on the two sides of the tunnel, the steel arch is supported on the basis of the composite soil nailing wall structures, safety is good, meanwhile, the number of supporting points is large, a constraint relation exists between the supporting points, and the anti-sinking performance of the steel arch is further improved.

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.

The utility model discloses a soil nail centering support manufacturing device convenient to adjust, and relates to the technical field of soil nail centering support manufacturing, the soil nail centering support manufacturing device comprises a supporting assembly, a pressing assembly is fixedly installed on the surface of the supporting assembly, a driving mechanism is fixedly installed in the supporting assembly, a protection assembly is movably installed on one side of the supporting assembly, and the protection assembly is fixedly installed on the other side of the supporting assembly. A limiting mechanism is fixedly installed on the surface of the protection assembly and comprises a screw motor. By arranging the protection assembly, the downward pressing assembly can be surrounded and protected in a three-face mode, so that the situation that workers are harmed due to the fact that broken blocks are splashed when soil nails are pressed and fractured in the soil nail machining process is avoided, and the safety of the device can be effectively improved; the position of the limiting pressing piece can be adjusted through cooperation of the screw motor and the limiting rod, so that the upper portion of the soil nail can be limited and installed after the soil nail is placed, the stability of the manufacturing process is improved, and meanwhile upward moving for discharging is facilitated.

The invention relates to the technical field of slope reinforcement, in particular to a slope multi-layer soil nailing and grouting comprehensive reinforcement method which comprises the following steps: determining the stability condition of a slope, and designing soil nailing and grouting parameters; installing an intelligent monitoring system; the slope is divided in a layered and segmented mode, and the construction sequence is defined; drilling holes in sequence and inserting soil nails; performing low-pressure grouting on the soil nail holes; grouting pipes are uniformly arranged at intervals; performing high-pressure grouting on the slope rock soil; and hanging a net and spraying concrete. Through application of detailed geological investigation and an intelligent monitoring system, accurate control and real-time monitoring of the slope construction process are achieved, low-pressure grouting and high-pressure grouting are combined, damage to a stratum structure is avoided, sufficient reinforcement of a rock-soil body is guaranteed, the method is high in construction efficiency, the reinforcement effect is remarkable, and the method is suitable for large-scale popularization and application. Geological disasters such as side slope landslide can be effectively prevented, the safety of the surrounding environment and life and property of people is guaranteed, and high economic and social benefits are achieved.

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 invention discloses a barb type self-locking anchoring device which comprises a barb type anchor nail, the barb type anchor nail is connected with an anchor disc through a steel wire rope, at least one group of symmetrically arranged barbs are hinged to the barb type anchor nail, the barb type anchor nail is located in a side slope soil body, the anchor disc is located on the surface of a soil slope, and the barb type anchor nail is connected with the anchor disc through a steel wire rope. The barbs on the barb type anchor nails are opened in the soil body through upward tensioning of the steel wire rope, and the internal soil body counter force is transmitted to the anchor disc on the surface of the soil slope. Compared with traditional soil nails and anchor rods, the scheme is simple in process, large professional equipment is not needed, professional teams are not needed, and one common worker can conduct driving and tensioning; compared with U-shaped nails and the like for slope material protection, the anchor nails of the device go deep into a soil body, controllable early-stage pretension is provided for the slope through tensioning, the slope material is pressed by the anchor disc, more effective slope anchoring force can be provided, and therefore the problem that the shallow surface layer of the soil slope slides, which cannot be solved by the steel bar nails and the U-shaped nails, is solved.

The invention discloses a deep foundation pit supporting structure of a soil nail retaining wall under integral row pile supporting and a construction method. The deep foundation pit supporting structure is suitable for deep foundation pit engineering of an underground pipeline crossing area. The structure comprises a top beam, row pile assemblies, soil nail assemblies and a reinforcing mesh structure, the row pile assemblies are constructed on the two sides of a projection area of the underground pipeline, an overall stress system is formed through embedded steel bars and the reinforcing mesh structure, reverse pouring is achieved in combination with a lengthened guide pipe, and pipeline migration is avoided. According to the construction method, layered excavation, instant supporting and jumping methods are adopted for hole forming, soil nail assemblies are arranged in a quincunx shape, prestress is applied, and the deformation of a pipeline area is controlled to be smaller than or equal to 30 mm. The problems that traditional supporting is interrupted, the pipeline migration cost is high, and the construction period is long are solved, the supporting integrity is enhanced, the construction period is shortened, the engineering cost is reduced, and the method is suitable for deep foundation pit engineering under the urban dense pipeline environment.

The utility model relates to the technical field of building construction, and discloses a side slope crest widening structure which comprises a construction top beam, a support pile, a support pile top beam, a plurality of reinforcing steel bar soil nails, a plurality of vertical steel pipes and a reinforcing steel bar net. One ends of the multiple reinforcing steel bar soil nails penetrate through the construction crown beam to be inserted into the side wall of the foundation pit and are arranged in parallel at intervals in the vertical direction and the first direction, the multiple vertical steel pipes are arranged at intervals in the first direction, and the other ends of the multiple reinforcing steel bar soil nails are fixedly connected with the corresponding vertical steel pipes. A concrete surface layer is arranged on the other side wall of the reinforcing mesh, the construction crown beam, the multiple reinforcing soil nails, the multiple vertical steel pipes and the reinforcing mesh are matched to form a backfill space used for containing a backfill sand bag, and a curing layer is arranged above the backfill sand bag and used for forming a construction channel. The slope top widening structure has the advantages that the slope top can be widened without increasing the elevation of the support pile, a construction channel is arranged, and the construction cost is reduced.