188results about How to "Improve pullout resistance" patented technology

The invention provides an anchor rod with a barb structure and a construction method.The anchor rod comprises a hollow anchor rod body, a core rod arranged in the anchor rod body and a barb part arranged on the outer side of the anchor rod body, and the length direction of the core rod is the same as that of the anchor rod body; the multiple barb parts are arranged in the length direction of the anchor rod body at intervals, a plurality of barb pieces are arranged on each barb part at intervals, and the barb pieces are obliquely arranged on the anchor rod body. And barb pieces are arranged at the positions, corresponding to the barb parts, of the core rod. According to the anchor rod with the barb structure and the construction method, the core rod is arranged in the hollow anchor rod body, and the barb pieces and the barb pieces are matched to form a special composite stress form, so that the overall pulling resistance of the anchor rod is effectively improved, the construction cost is reduced, and the construction period is shortened; and as the designed length of the anchor rod is obviously shortened, disturbance to the surrounding environment is reduced, and pollution to the environment is reduced.

The invention provides an anchoring section self-expansion locking structure and an anchor cable type rock mass stress and strain monitoring method. The anchoring section self-expansion locking structure comprises an anchoring section self-expansion locking anchor cable, and the anchoring section self-expansion locking anchor cable comprises self-expansion anchoring slurry, a magnetic anchor cable, an anchor cable type rock mass stress sensor, a combined strain sensor and a test analysis system; the magnetic anchor cable is anchored in an anchor hole of a side slope through self-expansion anchoring slurry; the anchor cable type rock mass stress sensor is arranged at a hole opening part of an anchor hole and is used for detecting the stress of the magnetic anchor cable; the combined strain sensor is arranged on the inner side wall of the anchor hole; and the anchor cable type rock mass stress sensor and the combined strain sensor are connected with the test analysis system through signal lines. According to the locking structure, based on the fact that the anchoring section is a key factor for determining the performance of the anchor cable, by increasing the pulling resistance of the anchor cable, on one hand, the reinforcing effect of the anchor cable on a slope can be improved, and on the other hand, guarantee is provided for the stability of long-term real-time monitoring of rock stress and strain.

The invention discloses an offshore single-pile structure foundation and a construction method thereof, the offshore single-pile structure foundation is composed of a main pile, a suction barrel assembly and a grouting sealing cover, the outer part of the main pile is annularly sleeved with the suction barrel assembly, and the top of the suction barrel assembly is provided with the grouting sealing cover. The structural form that the variable-diameter single pile and the multi-subdivision annular suction barrel are combined is adopted, the advantages of extremely high vertical bearing of the single pile and horizontal reinforcing supporting of the suction barrel are fully played, the horizontal swing load resisting capacity of the single pile on the mud surface section is effectively improved, and the horizontal swing load resisting capacity of the single pile on the mud surface section is effectively improved through horizontal reinforcing of the external suction barrel structure. Meanwhile, the structural rigidity is improved, the stability is improved, and long-term use is stable and reliable; the independent center supporting sleeve is arranged in the middle of the suction barrel assembly, so that when a single pile is scoured, the inner ring of the suction barrel can avoid a scouring pit, self-sinking sealing is achieved without being affected, the suction barrel can smoothly sink to the designed depth, and the bearing requirement is met.

The invention discloses a concrete test block anti-counterfeiting system and an anti-counterfeiting method, and belongs to the technical field of concrete detection. Comprising an anti-counterfeiting designation card, and a sample preparation end and a laboratory end which communicate with a server and identify the anti-counterfeiting designation card, the anti-counterfeiting designation card comprises a substrate, an identification code and a direction mark which are arranged on the front surface of the substrate, and a bending pin for fixing the substrate, and the laboratory end carries out anti-counterfeiting verification by identifying the installation direction, angle and distance of the anti-counterfeiting designation card. According to the invention, the anti-counterfeiting security is obviously improved, the reliability is enhanced, the verification efficiency is improved, and the adaptability to the environment is improved; meanwhile, a laboratory and a supervision platform are accessed to realize connection and integration with an existing system; besides, the system is set according to the national building material management standard, is compatible with other quality control systems, is convenient to integrate into the existing management system, promotes the industrial standardization process, and reduces the implementation cost.

The invention belongs to the technical field of slope supporting, discloses a slip-releasing slope surface supporting method based on a grouting steel pipe pile-lattice beam pre-stressed anchor cable, and aims to solve the problem that in an existing supporting system, a grouting steel pipe pile cannot provide enough shear capacity for a soil body around the pre-stressed anchor cable. The method comprises the following steps: (1) slope treatment; (2) surveying and setting out are conducted, and the positions of the pre-stressed anchor cables and the grouting steel pipe piles are determined; the pre-stressed anchor cables and the grouting steel pipe piles are arranged in a staggered mode. (3) pre-stressed anchor cables and grouting steel pipe piles are constructed; the pre-stressed anchor cables and the grouting steel pipe piles are arranged in the rock-soil body in the direction perpendicular to the slope surface of the side slope. And (4) lattice beam construction, wherein each connecting node of the lattice beam corresponds to a pre-stressed anchor cable or a grouting steel pipe pile. By changing the arrangement mode of the grouting steel pipe piles, the grouting steel pipe piles can provide more shear resistance for soil around the pre-stressed anchor cables, and then the stability of slope supporting is improved.

The invention discloses an ecological slope protection supporting structure for hydraulic engineering, and relates to the technical field of ecological slope protection, the ecological slope protection supporting structure comprises a fixing block, rotating plates are rotatably connected to the two sides of the surface of the fixing block, inserting rods slidably mounted on the fixing block are arranged below the rotating plates, and the inserting rods are used for being inserted into soil to fix the position of the fixing block; a control assembly is arranged in the fixing block. According to the ecological slope protection supporting structure for the water conservancy project, when rainwater slides down from a slope and generates impact force on the rotating plate, the mechanism can automatically adapt to the external force and convert the external force into rotating kinetic energy of the rotating plate, manual intervention is not needed in the design, rainwater impact can be automatically responded, and the intelligent degree and the automation degree of a system are improved; the rotating plate rotates through a series of mechanical transmission to finally drive the supporting plate and the first pressing plate and the second pressing plate on the supporting plate to conduct compaction treatment on soil, the compaction mechanism is efficient, the compactness of the soil around the inserting rod can be guaranteed, and soil loss is effectively prevented.

The invention relates to the field of medical instruments, in particular to an implanting system and method for an anchor with a thread. The device comprises an anchor, a push rod, a handle, a screwing rod and a suture. The rivet body is of a tubular structure, a connecting part is arranged at the tail of the rivet body, and a deformation part is arranged at the front end of the rivet body; the tail of the nail head is provided with a transmission part, and the outer wall is provided with an expansion part. A guide hole is formed in the middle of the push rod, and an inserting part is arranged at the front end; the handle is slidably connected to the push rod and can apply knocking force to the push rod through inertia. The screwing rod is slidably connected in the guide hole, and the front end is provided with a meshing part. One end of the suture is connected to the nail head, and the other end penetrates through the anchor and the pipe cavity of the screwing rod. Through the unique structural design, effective fixation of the anchor is achieved, the operation efficiency and safety are improved, meanwhile, the operation process is simplified, and clinical application is facilitated.

The invention discloses a guide hole pile sinking construction process for a PHC tubular pile in a gobi area of a plateau, relates to the technical field of PHC tubular pile construction, and aims to solve the problems that the construction of the PHC tubular pile is greatly challenged due to complex geological conditions, most of soil is loose gravel and the terrain fluctuation is relatively large in the gobi area of the plateau, and the construction progress is delayed due to the existence of a gravel layer, so that the construction cost is reduced. In order to solve the problem that more time and effort are needed to penetrate through the layers, the construction technology comprises the following steps that S1, preparation before construction is conducted, specifically, PHC pipe pile materials are prepared, surveying and setting-out are conducted through a total station, a theodolite or a level gauge, and a plane control network and an elevation control network of a project are built; the method has the advantages that it is guaranteed that various detection data such as the bearing capacity and the pulling resistance of a pile body meet the design requirements, and the pile is compact, resistant to hitting, high in penetrating capacity and high in adaptability to geological conditions with large terrain changes.

The utility model discloses a pre-embedded steel bar connecting sleeve and component, the connecting sleeve comprises a sleeve body, the sleeve body comprises a plurality of sections of cylindrical inverted cone-shaped circular truncated cones which are integrally formed, and a transition cone-shaped step of which the diameter is small at the upper part and large at the lower part is arranged at the connecting position of two adjacent cylindrical inverted cone-shaped circular truncated cones. The outer surface of the cylindrical inverted-cone-shaped circular truncated cone on the sleeve is in an inverted cone shape, compared with a sleeve with the circular surface, the contact area between the sleeve and concrete can be increased, the binding force and the bond stress between the sleeve and the concrete are improved, and the uplift resistance between the sleeve and the concrete can be improved through the transition cone-shaped step with the diameter being small in the upper portion and large in the lower portion. And the stability of the embedded sleeve embedded in the concrete is ensured.

The utility model discloses a stable embedded sleeve, which belongs to the technical field of railway engineering and comprises a sleeve body component, a stabilizing component and a sealing cover component. The cylinder component is of a columnar structure, a containing space extending in the axis direction of the columnar structure is formed in the top end face of the cylinder component, and the connecting component is detachably connected into the containing space. The stabilizing components are all arranged on the outer wall face of the cylinder component, and a plurality of protruding parts are formed on the outer wall face of the cylinder component. The sealing cover component is arranged at the opening of the containing space and used for opening or blocking the opening of the containing space. The utility model provides a stable pre-embedded sleeve which can adapt to the working environment of a construction site, not only can avoid the influence on road and bridge surface passing during construction, but also can remarkably improve the binding power and pulling resistance between the sleeve and concrete, avoids the separation between the sleeve and a peripheral concrete layer, and improves the construction quality. And the safety and durability of the connecting component are ensured.

The invention provides a wing-shaped anchor nail and an inserter, and relates to the technical field of medical instruments, the wing-shaped anchor nail comprises a nail body used for being knocked into a to-be-treated part, the nail body comprises a head part and a tail part, the tail part is provided with a threading hole, the head part is conical, the outer wall of the nail body is provided with a guide groove which is concave inwards and extends in the length direction, and the guide groove is provided with a through hole. Meanwhile, a plurality of wing arms are arranged on the outer wall, and the angle between each wing arm and the nail body can be changed. The conical tail part of the screw can be conveniently knocked into a part to be treated, the guide groove can accommodate the positioning needle, so that the accurate positioning of the screw body can be realized without instrument observation, and as the included angle is formed between the wing arm and the screw body, the pullout resistance can be increased, and the defect that the holding force of a traditional screw is limited is overcome.

The utility model discloses a kind of foundation structure and wind turbine generator set of wind turbine generator set, it is related to wind power generation technical field, wherein, foundation structure includes first bearing platform, second bearing platform, multiple bored piles and multiple anchor rods, the top surface of first bearing platform is connected with the connecting cylinder for connecting the tower cylinder of wind turbine generator set;Second bearing platform is set below first bearing platform, the top surface of second bearing platform projects the bottom surface of first bearing platform and forms step surface, the vertical projection of the bottom surface of first bearing platform in second bearing platform forms core area, the edge of second bearing platform forms the expansion area surrounded in core area;Multiple bored piles are distributed in core area with interval, each bored pile extends downward from the bottom surface of second bearing platform, and bored pile is vertically arranged;Multiple anchor rods are distributed in expansion area with interval, and anchor rod extends downward from the bottom surface of second bearing platform and is arranged with inclination.The foundation structure has good bearing capacity and stability, can guarantee the safety and stability of wind turbine generator set in long-term operation process.

This utility model discloses a single-sided formwork reinforcement structure for ultra-high shafts, including a shaft, a cast-in-place pile at the bottom of the shaft, ground anchors on the outer side of the cast-in-place piles, masonry on the inner wall of the shaft, a ring beam on the masonry from bottom to top, wall anchor bars penetrating the surface of the masonry, and a water-stop bolt connected to the end of the wall anchor bar away from the inner wall of the shaft. One end of the water-stop bolt is longitudinally connected in series or extends to the wall anchor bar on the opposite side of the masonry. This utility model, through a composite anchoring system, improves the support of the single-sided formwork through the interaction of multiple anchoring system layers; simultaneously, combined with the ground anchor structure, it effectively distributes the lateral pressure evenly to the ground anchor bars, increasing the overall pull-out resistance by more than 40% compared to traditional ground anchors, and eliminating the need for through-wall bolts, thus avoiding future water seepage problems.

This utility model discloses a novel anchor bolt suitable for layered soft rock tunnels with different large deformation levels, relating to the field of soft rock tunnel support technology. It includes a first rod body, a second rod body, and an extension mechanism. The extension mechanism is disposed between the second rod body and the first rod body. The end of the first rod body is connected to an end cap, and a pad is disposed between the end cap and the first rod body. This utility model employs the aforementioned novel anchor bolt suitable for layered soft rock tunnels with different large deformation levels. The arrangement of the first and second rod bodies enhances the stability of the anchor bolt, resulting in more stable bonding anchoring force and higher pull-out resistance compared to simple metal anchor bolts, while also adapting to complex working conditions. The extension mechanism addresses the issue of easy deformation in soft rock, better utilizing the anchor bolt's support function. The material of the second rod body provides excellent adhesion and corrosion resistance, forming a high-strength anchoring interface, and its connection with the extension device enhances the stability of the device.

The utility model relates to the technical field of concrete square piles, and discloses an anti-compression and anti-pulling precast concrete square pile which comprises a concrete square pile body, a pile tip and an anti-pulling mechanism, the pile tip is fixedly arranged at the bottom end of the concrete square pile body, and the anti-pulling mechanism is fixedly arranged at the outer end of the concrete square pile body. An auxiliary mechanism is fixedly arranged at the inner end of the concrete square pile body; the anti-pulling mechanism comprises grooves, barb-shaped steel bars and anti-rust paint, the grooves are evenly formed in the outer end of the concrete square pile body, the barb-shaped steel bars are fixedly arranged on the side, close to the pile tip, of the outer end of the concrete square pile body, and the barb-shaped steel bars extend to the inner end of the concrete square pile body. According to the compression-resistant and pulling-resistant prefabricated concrete square pile, by arranging the pulling-resistant mechanism, the pulling-resistant performance of the concrete square pile is conveniently improved, the buoyancy of underground water is conveniently resisted, the anti-seismic effect is improved, normal use of a building is guaranteed, the use requirements of people are conveniently met, and the practicability is improved.

The utility model discloses a water conservancy ditch slope protection device which comprises a protection frame, the upper wall and the lower wall of the protection frame are each provided with a plurality of sets of evenly-distributed water leakage holes, green plant planting areas are arranged on the inner sides of the protection frame, inserting rods are fixedly connected to the four corners of the bottom of the protection frame, and soil breaking cones are fixedly connected to the bottom ends of the inserting rods. The four corners in the protection frame are in threaded connection with screws, and the top ends of the screws are fixedly connected with twisting blocks. According to the water conservancy ditch slope protection device, after a soil breaking cone and an inserting rod are inserted into soil, a twisting block is rotated, the twisting block rotates to enable a screw rod to rotate and move downwards in a protection frame, a downward pressing block pushes a connecting ball to move outwards in the downward moving process, an anti-disengaging rod and a spine move outwards, and the anti-disengaging rod and the spine are transversely inserted into the soil; the protection mechanism is prevented from falling off from the slope body due to rain wash, and the anti-pulling capacity of the protection mechanism is improved.

The utility model relates to the technical field of tunnel lining, in particular to a shield segment socket structure which comprises a connecting rod and embedded parts assembled at the two ends of the connecting rod, the connecting rod comprises a spindle body with the middle protruding and rod bodies connected to the two ends of the spindle body and used for being matched with the embedded parts, and each embedded part comprises an outer pipe and an inner pipe. The inner pipe is composed of a plurality of elastic clamping pieces which are evenly distributed in the axial direction of the rod body, the elastic clamping pieces are all in a radial shape towards the near end to form a one-way expansion bayonet, the elastic clamping pieces are further provided with fasteners matched with the rod body, and the inner wall of the outer pipe is provided with a plurality of first annular flanges which are evenly distributed in the axial direction. A clamping groove capable of containing the expansion bayonet is formed between every two adjacent first annular flanges, and a fixing groove capable of containing the fastener is formed between every two adjacent second annular flanges. According to the pipe piece socket structure, the connecting rod is axially inserted into the embedded part through the socket structures at the two ends of the connecting rod, the connecting construction difficulty of adjacent pipe pieces is reduced, and the connecting stability is guaranteed.

The invention relates to the technical field of side slope protection, in particular to a road side slope ecological protection structure which comprises positioning nails and a protection net and further comprises an anchoring mechanism arranged on the positioning nails and used for enhancing the anchoring stability of the positioning nails and side slope soil. The anchoring mechanism comprises a long shaft, the long shaft is fixed to the bottom of an inner cavity of the positioning nail, the top end of the long shaft penetrates through the top end face of the positioning nail, the outer surface of the long shaft is sleeved with a movable sleeve, a plurality of first sliding grooves are formed in the two sides of the movable sleeve, and fixing rings corresponding to the first sliding grooves in position are fixed to the inner wall of the positioning nail. An extrusion part is slidably connected between the first sliding groove and the fixing ring, a plurality of supporting parts are slidably connected to the interior of the positioning nail in the radial direction, a fixing plate is fixed to the bottom of each supporting part, and a barb type anchoring structure is formed when a nut is screwed, so that radial extrusion force is efficiently converted into embedding power of the positioning column; pressure concentration or insufficient thrust is avoided, and the pulling resistance is remarkably enhanced.

The utility model provides an LED lamp bead and a display module, and the LED lamp bead comprises a light-emitting chip, a connecting column, a lamp base and a wire. The external threads arranged on the side wall of the periphery of the connecting column of the LED lamp bead can be matched with the mounting holes, with the internal threads, of the substrate or other mounting carriers, and compared with traditional welding connection, the threaded connection structure can remarkably improve the bonding strength between the LED lamp bead and the substrate or other mounting carriers. When the LED lamp bead is subjected to external vibration or impact, the threaded connection structure can provide larger pulling resistance through the threaded connection matching effect so as to enhance the thrust of the LED lamp bead, the service life of the LED lamp bead is effectively prolonged, and the working stability of the LED lamp bead is effectively improved.

The application discloses a shear connector, a steel-concrete composite beam containing the shear connector and a construction method of the steel-concrete composite beam. The shear connector comprises an inverted truncated cone type cylinder (7), a stiffener, a cover plate, a penetrating steel bar (8) and a high-strength bolt (21); the stiffener comprises an integrally formed stiffener bottom plate (13) and a stiffener side plate (14), the size of the stiffener bottom plate is consistent with the size of the lower opening of the cylinder, and the stiffener bottom plate is attached to the lower opening of the cylinder; the stiffener bottom plate is provided with a second connecting hole for connecting the high-strength bolt; the stiffener side plate is arranged around the stiffener bottom plate and is attached to the inner wall of the cylinder; the height of the stiffener side plate is lower than that of the first connecting hole; the cover plate covers the upper opening of the cylinder; the penetrating steel bar transversely passes through the cylinder through the first connecting hole and leaves a connecting section on each side of the cylinder; and the high-strength bolt connects the stiffener bottom plate through the second connecting hole. The application realizes the disassembly and replacement of each component of the shear connector and the prefabricated bridge deck; and the structure form and stress performance of the shear connector are optimized.

The present invention discloses a design method and device for a side-starting shield steel ring embedded anchor plate, the device includes embedded anchor plates, back connecting steel bars, structural steel bars, full welding points, plug hole welding points, and special-shaped steel rings, and the method includes building a model, generating a force cloud map, force condition analysis, and embedded anchor plate distribution design. The beneficial effects of the present invention are: the anchor plate is welded to the side wall structural steel bars by steel bar plug welding to form a structural whole, thereby improving the pull-out resistance of the anchor plate; through relevant calculations, it is found that when the special-shaped steel ring starts excavation, the force on the embedded anchor plate is different from that on conventional excavation, that is, the tension on the short side and the upper anchor plate is about twice the conventional tension. Based on this, when designing the anchor plate reinforcement steel bars, the top area and the short side area should be designed with denser layout of anchor steel bars to ensure the safety of engineering construction.

The utility model belongs to the technical field of building construction, and relates to a grouting pipe used for grouting of an engineering pile and a reinforcement cage comprising the grouting pipe, the grouting pipe comprises a conveying section and a grouting section which are connected, the outlet end of the conveying section is communicated with the inlet end of the grouting section, the grouting section is annular or spiral, and the conveying section and the grouting section are connected. The grouting section is provided with a plurality of grouting openings facing the outer side and a reinforcement cage comprising the grouting openings. According to the utility model, the single-pile bearing capacity and the single-pile pulling resistance can be improved in an engineering pile structure with smaller pile diameter and longer pile length in a scene of a deep sand layer.

The invention discloses geological disaster monitoring and early warning equipment, and belongs to the field of monitoring and early warning equipment, the geological disaster monitoring and early warning equipment comprises a base, a positioning cone is fixedly mounted at the bottom end of the base, a stand column is fixedly mounted at the top end of the base, a mounting ring fixedly sleeves the side wall of the lower section of the stand column, and a stabilizing assembly is arranged on the side wall of the mounting ring. A mounting box is fixedly mounted at the top end of the stand column, a mounting disc is rotatably mounted at the top end of the mounting box, a monitoring and early warning device body is fixedly mounted at the top end of the mounting disc, a rotating assembly is arranged between the mounting disc and the mounting box, and a distribution box is arranged at the top end of the base; a sleeve is arranged on the side wall of the stand column. Through the arrangement of the protection plate and the buffering assembly, when an object collides with the stand column, the object firstly collides with the protection plate, then the buffering assembly pushes the protection plate to bounce off the object, the buffering effect can be achieved, and the effect of protecting equipment is achieved.

The application discloses a pre-buried adjustable expansion depth expansion bolt assembly and belongs to the technical field of expansion bolts, which comprises a spring pad, a flat pad, a pre-buried sleeve, a hexagonal nut, an expansion sleeve, an expansion cone, an adjusting screw rod and a sealing end cover. In order to overcome the defects of the prior art, such as the damage to the concrete structure and the internal steel bars caused by the post-construction of the expansion bolt, the fixed and unadjustable expansion depth of the pre-buried anchor bolt, the jamming of the adjusting mechanism caused by the cement seepage due to the unreliable sealing of the plastic film during the pouring process, and the loosening of the anchoring force under long-term vibration, the application provides the pre-buried adjustable expansion depth expansion bolt assembly, so that the expansion depth of the expansion bolt on the market can be flexibly adjusted according to the actual wall thickness or the size of the decorative layer under the premise of pre-buried installation, the problems of the poor stability of the sealing end cover during the pouring process, the cement leakage caused by the poor stability of the sealing end cover, the single anchoring force between the expansion sleeve and the concrete and the insufficient long-term reliability of the expansion sleeve and the concrete are solved.

The present invention discloses a concrete test block anti-counterfeiting system and anti-counterfeiting method, which belongs to the field of concrete detection technology; it includes an anti-counterfeiting label card, and a sample preparation end and a laboratory end that communicate with a server and identify the anti-counterfeiting label card; the anti-counterfeiting label card includes: a substrate, an identification code and a direction indicator set on the front of the substrate, and a bending foot for fixing the substrate; the laboratory end performs anti-counterfeiting verification by identifying the installation orientation, angle, and distance of the anti-counterfeiting label card. The present invention significantly improves anti-counterfeiting security, enhances reliability, improves verification efficiency, and improves environmental adaptability; at the same time, it is connected to the laboratory and supervision platform to achieve connection and integration with the existing system; in addition, the system is set according to the national building materials management standards, compatible with other quality control systems, and easy to integrate into the existing management system, which promotes the industry standardization process and reduces the implementation cost.

This utility model relates to the field of anchor bolt technology, and in particular to an anchor bolt structure for geotechnical construction, including an anchor bolt, a guide head, a sliding sleeve A, an anti-slip plate, and an elastic support assembly. The anchor bolt has a through hole coaxial with it, and several barbs A are provided on its outer wall. The guide head is connected to one end of the anchor bolt and has a grouting hole communicating with the through hole. The sliding sleeve A is fitted onto the anchor bolt, and several sets of connecting rods A are provided on the sliding sleeve A, with two connecting rods A in each set, and the two connecting rods A in the same set are parallel to each other. The anti-slip plate is rotatably connected to the ends of the two connecting rods A on the corresponding side away from the sliding sleeve A. The elastic support assembly is provided on the anchor bolt to expand each connecting rod A, thereby synchronously adjusting the distance between each anti-slip plate and the anchor bolt axis. This utility model improves the pull-out resistance of the anchor bolt and the stability of the connection between the anchor bolt and the geotechnical structure by relying on the anti-slip plate expanded by the elastic support assembly to abut against the inner wall of the rock borehole and by adding the barb structure.

The application relates to the technical field of building foundation construction, in particular to a prestressed anchor rod, which comprises a hollow anchor rod body, a backing plate, a connecting piece, a swelling shell anchoring piece and an exhaust pipe. The hollow anchor rod body is arranged in a rock stratum hole, the end of the rock stratum hole far from the hole mouth is an output end, and the other end is an input end. The swelling shell anchoring piece is arranged at one end of the hollow anchor rod body close to the output end. The connecting piece is detachably arranged at one end of the hollow anchor rod body close to the input end. The backing plate is arranged on the hollow anchor rod body, the connecting piece is pressed against the front surface of the backing plate, the back surface of the backing plate is pressed against the hole wall of the rock stratum hole, one end of the exhaust pipe is connected into the rock stratum hole, and the other end extends outward. A cement grouting layer is further arranged in the rock stratum hole. The prestressed anchor rod can meet the supporting capacity and improve the installation convenience.

The utility model discloses a novel anti-pulling anchor rod pile structure, which belongs to the technical field of pile foundations and is characterized in that a novel anti-pulling anchor rod pile is divided into an expanded anchoring section and a common anchoring section and penetrates through a central rod body of a pile body, and a sleeve is arranged outside the rod body. The expanded anchoring section is a connecting part of the rod body inserted into the reinforcing steel bar clamping groove disc and the umbrella-shaped reinforcing steel bar mesh A; the common anchoring section is a part where the rod body is inserted into the steel bar clamping groove disc and connected with the umbrella-shaped steel bar mesh B; the reinforcing steel bar clamping groove disc is fixed on the rod body through a nut; the steel plate A is fixed to the pile top through the high-strength nut, and the spring and the steel plate B are sleeved with the top of the rod body. And after the anchor rod pile is put down, the steel wires are adjusted, and the reinforcing mesh A and the reinforcing mesh B fill the expanded anchoring section and the common anchoring section in an umbrella shape. The anchor rod pile is simple in structure, and the pulling resistance of the anchor rod pile is improved by enlarging the pulling resistance of the anchoring section and the friction force between the common anchoring section and the soil body; the durability of the pile body is improved through the sleeve; applying prestress through the steel plate A; foundation steel bars are connected with springs, and the anchoring force of the pile and the foundation is improved.

The application discloses a kind of air-tightness detection devices for automobile engine fuel injection nozzle production, belong to fuel injection nozzle detection technical field, the air-tightness detection device for automobile engine fuel injection nozzle production of the present application, including pedestal, the pedestal is fixedly connected with a plurality of first fixed frame, the first fixed frame is fixedly connected with transparent test tube in, the pedestal upper end is fixedly connected with a plurality of fixed plate, the upper end of the pedestal is fixedly connected with wire plug-in mechanism, the fixed plate is provided with fuel injection nozzle fixing mechanism, fuel injection nozzle fixing mechanism and transparent test tube between being provided with the fuel injection nozzle to be measured, one side of the pedestal is fixedly connected with reflux pump, the reflux pump is fixedly connected with liquid storage tank at the end away from the pedestal.The present application is used by wire plug-in mechanism and fuel injection nozzle fixing mechanism, the process of fuel injection nozzle air-tightness test is greatly automated, greatly reduce the time required for test product fixation and wire connection, improve detection efficiency.