75results about How to "Improve tensile capacity" patented technology

A double shouldered high torque resistance threaded connection for drill stem components having enhanced resistance to torque forces, tensile loads and material stress and fatigue is disclosed. The tool joint is provided with threads having a 75 DEG included angle between the thread flanks thereof and with generally elliptical root surfaces to minimize material stress and fatigue during operation under high torque and high tensile loads. When made up, the double intrerengaging shoulders of the threaded tool joint are in firm face to face engagement permitting torque forces and tensile loads to propagate through the tool joint in a manner that minimizes bending forces and minimizes high stress concentration so that the resulting service life of the tool joint is significantly enhanced.

The invention discloses an anti-seismic prefabricated concrete solid square pile which comprises main reinforced bars, hoop reinforcements, anchoring bars, pile caps and concrete. A cross section main body of a pile body is square; the main reinforced bars are formed by sequentially permutating and combining prestress main reinforced bars and general main reinforced bars and penetrate through the pile body along the longitudinal direction of the pile body; the hoop reinforcements are arranged on the outer edges of the main reinforced bars and are spirally squared; the pile caps are respectively arranged at two ends of the pile body and consist of end plates and skirt edges; the main reinforced bars and the hoop reinforcements are connected by welding or binding to form a steel reinforcement cage; two ends of the prestress main reinforced bars are fixedly arranged on the end plate by riveting or using a bolt connecting mode; the general main reinforced bars are separated from the end plate and are shorter than the prestress main reinforced bars; and the anchoring bars are respectively arranged at two ends of the pile body. The anti-seismic prefabricated concrete solid square pile with the structure simultaneously has high press bearing capacity, tensile bearing capacity, shear bearing capacity and flexural bearing capacity and is a concrete solid square pile suitable for industrial mechanical production and is used for high seismic fortification intensity.

The invention relates to a recovery type anchor bar, comprising an outer sleeve steel pipe, a screw rod disposed in the outer sleeve steel pipe along the axial direction, an upper cover board fixed on the top of the outer sleeve steel pipe, a regulation nut disposed at center of the upper cover board, a lower cover board fixing on the bottom end of the outer sleeve steel pipe, an anchor cone disposed right under the lower cover board, and a plurality of upper connection boards disposed on bottom end of the lower cover board, wherein the upper portion of the screw rod is attached to the regulation nut through a screw thread, the lower portion of the screw rod is attached to the anchor cone. Each upper connection boards is hinged to the top of an upper pulling rod, bottom end of each upper pulling rod is hinged to the top of a lower pulling rod, bottom end of each lower pulling rod is respectively attached to the anchor cone through a pin. Object of the invention is to provide a recovery type anchor bar which is high in shearing resistance capacity, underground space saving, underground environment pollution-free, and steel saving.

The invention provides a tensile limiting isolation bearing. The tensile limiting isolation bearing comprises a bearing body, an upper connecting plate, a lower connecting plate and a tensile limitingdevice, wherein the upper connecting plate and the lower connecting plate are fixed with the upper and lower ends of the bearing body; the tensile limiting device is arranged on the periphery of thebearing body; the tensile limiting device comprises two slip limiting mechanisms which are orthogonal to each other; the two slip limiting mechanisms are connected through a flexible material. The tensile limiting device is arranged on the periphery of the bearing body, and slips freely along an axis X and an axis Y, so that the maximum deformation of the bearing body along the axis X and the axisY is limited without affecting the horizontal isolation performance of the bearing body. The flexible material bears the tensile force on the bearing body along an axis Z, so that the Z-axis tensilerigidity of the bearing is effectively enhanced. In the case of strong shock, the tensile limiting device can effectively avoid instability when the deformation of the bearing body exceeds a deformation limit; meanwhile, the Z-axis tensile performance of the bearing is enhanced, and the stability and safety of the isolation bearing are improved.

The invention discloses a conical pipe anchor bar connection structure for a prefabricated assembly structure, and belongs to the field of prefabricated assembly engineering. The connection structurecomprises a conical pipe, a grouting guide pipe and a fixing circular ring. The conical pipe is of a pre-embedded structure, the conical pipe can achieve a restraint effect on steel bars and groutingmaterials in the conical pipe, and meanwhile the tension capacity of the conical pipe in concrete can be improved. Frame vertical ribs and tie bars in a prefabricated bearing table also achieve a restraint effect on cracking of the bearing table or foundation concrete caused during pulling of the conical pipe. In prefabricated components, a conical pipe group is connected with the surrounding frame vertical ribs and the tie bars, and therefore the anchor performance of the conical pipe group can be improved. The steel bar anchorage length needed by the conical pipe anchor bar connection structure is small, the conical pipe anchor bar connection structure can be used for connection between a reinforced concrete structure prefabricated assembly component and a foundation or the bearing table, and rapid building of the prefabricated assembly reinforced concrete is achieved.

The invention discloses a string truss structure with a load-relieving effect and an implementation method. The string truss structure comprises an upper string truss, a plurality of stay bars, a guy cable, a spherical joint fixed support and a sliding hinge support, wherein the spherical joint fixed support comprises a lower part supporting structure, a pre-embedded base plate, a reverse T-shaped sliding plate, a plurality of pre-embedded reinforcing steel bars, a fixed spherical joint, a plurality of columnar rolling bearings, an anchoring device, a plurality of damping springs and a support. The string truss structure with the load-relieving effect and the implementation method provided by the invention have the advantages of high material utilization rate, good stress performance, safety and simplicity for constructions, superior safety performance and the like.

The invention relates to wall hanging film and its base adhesive method. It includes the following steps: spreading liquid glue on the base surface or melting it by instantaneous high temperature; bending the film into cambered surface and pressing on the base. The invention includes upper and lower models. And the former includes adhesive film gripper block; the latter includes base fixing groove. This can effectively prolong the useful life of the pullback.

The invention belongs to the field of construction materials and provides a prestressed reinforced concrete solid square pile and a manufacturing technique thereof. The prestressed reinforced concrete solid square pile comprises a pile body, a pile cap and a pile point, wherein the pile body comprises concrete and a pile body reinforcement cage. The pile body reinforcement cage is square and is formed by roll welding of a plurality of longitudinal main ribs and spiral stirrups. The pile cap is arranged at one end of the pile body and comprises an end plate, wherein the end plate is a square steel plate. The pile point is arranged at the other end of the pile body. The pile point is a steel pile point or a reinforced concrete pile point. The prestressed reinforced concrete solid square pile has the advantages that the structural design is reasonable, excellent anti-cracking performance is achieved, and efficiency of the manufacturing technique is high. The prestressed reinforced concrete solid square pile is suitable for an industrialized production mode.

The invention discloses a swing column-hybrid limb-connected wall structure capable of restoring after being damaged in an earthquake and an assembly method. According to the swing column-hybrid limb-connected wall structure capable of restoring after being damaged in the earthquake and the assembly method, a reinforced concrete wall only generates a bending moment and shear force, axial force generated at the bottoms of wall limbs under the coupling effect is avoided, the energy dissipation requirement for a reinforcing region at the bottom of a shear wall is effectively lowered, damage to the wall limbs can be controlled more easily, the original axial force of the wall limbs is transferred to swing columns on the two sides, brittle shear damage to the wall limbs of the reinforced concrete wall under tension can be effectively avoided as long as the stability of the swing columns can be guaranteed under stress, and force transmission is simple and reliable. According to the swing column-hybrid limb-connected wall structure used as a first defense line for earthquake fortification, a steel coupling beam is good in ductility and high in energy dissipation capacity; a joint connection manner beneficial to replacement is adopted, so that disassembly is easy, and operation is simple; all fixing parts are of a detachable structure and can be re-spliced and re-connected after the energy-dissipation coupling beam is replaced, so that construction and post-earthquake consolidation are made very convenient.

The invention provides a double T-shaped composite beam provided with prestressed steel tube concrete core rods, which is formed by utilizing the prestressed steel tube concrete core rods as tensioned lower flanges, adopting corrugated steel plates as web plates and pouring an upper flange top plate with high-strength concrete. The prestressed steel tube concrete core rods consist of steel tubes, intra-tube concrete and prestressed steel bars, and have high tension capacities; as the prestressed steel tube concrete core rods are combined with the corrugated steel web plates for use, the advantages are complemented, the shear capacity and flexural capacity of a crossbeam are improved, and the crossing ability of the crossbeam is improved. The composite beam has the advantages of light weight, great crossing ability, high bearing ability, high stiffness, low cost and the like, can be suitable for volume production in prefabricated part factories, can serve as a roof beam for constructing a 30-48m oversized-span single-storey industrial factory building, and as a floor beam for constructing a 21-30m large-span multi-storey industrial factory building, meets the requirements of industrial production on a large space, and saves land.

The invention discloses a steel bar prestressed steel pipe concrete supporter, belongs to a building structure component, and particularly relates to a steel-concrete combined structure support component. By aiming at solving the problems of serious post-earthquake structure damage and too great lateral displacement of a framework structure under the horizontal earthquake effect and simultaneously overcoming the defect of great steel consumption of a steel structure supporter, the invention provides the steel bar prestressed steel pipe concrete supporter. On the basis of a steel pipe concrete supporter, ordinary steel bars are embedded in concrete; the two ends of the ordinary steel bars are anchored onto steel pipe end plates; prestress is applied onto the concrete by a post-tensioning method, so that the steel pipe concrete supporter can simultaneously bear great pressure and tension under the effect of a horizontal earthquake load. A building structure using the steel bar prestressed steel pipe concrete supporter has excellent anti-earthquake performance and high material utilization efficiency, and can sufficiently achieve the advantages that the mechanical property is good; the construction is convenient; and economy and reasonableness are realized.

The invention relates to the field of buildings, in particular to an admixture for marine engineering concrete and a preparation method of the admixture. The admixture is prepared from raw materials in parts by weight: 100-150 parts of a water reducing agent, 0.5-1 part of tetramethylammonium iodide, 1-5 parts of sodium ethoxide, 3-5 parts of polyacrylamide, 30-50 parts of a surfactant, 15-20 parts of a rust inhibitor, 30-50 parts of an expansion agent, 3-5 parts of a retarder, 6-10 parts of a deforming agent and 0-80 parts of water. The invention aims to overcome the shortcomings of the priorart and provide the admixture for the marine engineering concrete and the preparation method of the admixture, the effects of water reduction, rust resistance, defoaming and retarding are achieved, and the effects are improved; the admixture is added into the concrete, so that the flowability of concrete slurry is improved, retentivity is good, the water reduction rate is high, the density of theconcrete is improved, good flocculability is achieved, and the friction resistance between liquid can be reduced; and the grinding efficiency is improved, and the admixture has the characteristics ofexcellent anti-permeability, fast hardening and early strength, high later strength and the like.

The invention discloses a basalt fiber grid reinforced lining structure for a high ground temperature high-pressure hydraulic tunnel. A primary lining, a water-resisting layer and a secondary lining are sequentially arranged from the surface of a tunnel surrounding rock to the wall of a tunnel, wherein the primary lining is a reinforced concrete layer, the water-resisting layer comprises a concrete sealing primer layer on the outer wall surface of the primary lining and a polyurea elastomer layer on the outer surface of the concrete sealing primer layer, and the secondary lining is a reinforced concrete layer with basalt fiber grids embedded inside. The basalt fiber grids with high tensile bearing capacity are assembled inside the secondary lining, the reinforced concrete linings are effectively reinforced by inhibiting generation of tension cracks, polyurea elastomer is sprayed to the outer wall of the sprayed concrete primary lining to serve as a water-resisting material, unfavorable action of heat conduction between the high-temperature surrounding rock and low-temperature high-pressure water can be reduced, and the basalt fiber grids and circumferential reinforcements jointly bear circumferential tensile force generated by temperature gradient and high-pressure water load when the hydraulic tunnel is in water filling operation.

The invention discloses a windproof reinforcing device for a mobile workshop. The windproof reinforcing device comprises a connecting mechanism, a cable and a ground anchor, the connecting mechanism is fixedly connected onto a steel column on the upper inner side of the mobile workshop, a first cable connecting device of the connecting mechanism penetrates through a wall surface composite plate of the mobile workshop to protrude out of the wall surface of the mobile workshop, the ground anchor comprises a second cable connecting device and a cavity provided with a strip hole, the cavity internally comprises a fixed plate provided with transmission teeth and a rotating rod provided with a gear, the gear is meshed with the transmission teeth, and the rotating rod can drive the fixed plate to protrude out of the cavity or retract into the cavity along the strip hole. The windproof reinforcing device for the mobile workshop has the advantages that the connecting mechanism is fixedly connected onto the steel column on the upper inner side of the mobile workshop, the first cable connecting device of the connecting mechanism penetrates through the wall surface composite plate of the mobile workshop to protrude out of the wall surface of the mobile workshop, the ground anchor is buried underground outside the mobile workshop, and the first cable connecting device is connected with the second cable connecting device of the ground anchor through the cable, so that the mobile workshop is stabilized.

The invention discloses a multifunctional long foundation bolt. The multifunctional long foundation bolt comprises a deeply-buried portion, a hook and a nut, the deeply-buried portion is provided with a cylindrical head, a neck and a tail, a first external thread is arranged on the head of the deeply-buried portion, the neck of the deeply-buried portion is located between the head and the tail of the deeply-buried portion, a second external thread is arranged on the tail of the deeply-buried portion, a first curved arm and a second curved arm are arranged on the hook and arranged in an L shape, a first internal thread which is matched with the first external thread is arranged at the tail end of the first curved arm, and a second internal thread which is matched with the second external thread is arranged on the nut. By the aid of the method, the multifunctional long foundation bolt integrates a plurality of installation and dismounting functions and is simple to operate, flexible to use, high in tensile bearing capacity and small in occupied space.

The invention discloses a leaky cable fixture with multiple self-locking functions. The leakage cable fixture comprises a fixing seat for fixing a leaky cable and a clamping cover, and the fixing baseis provided with a first clamping jaw and a second clamping jaw. The clamping cover is provided with a rotating part and a clamping part, the clamping part of the clamping cover is connected with thesecond clamping jaw in a buckled mode, anti-loosening structures capable of being installed in a matched mode are arranged on the clamping part and the hooking and clamping face of the second clamping jaw respectively, each anti-loosening structure comprises a limiting hole and a limiting protrusion, and when the clamping part is connected with the second clamping jaw in a buckled mode, the limiting protrusions are located in the limiting holes. The rotating part of the clamping cover is rotatably connected with the first clamping jaw, and the first clamping jaw, the second clamping jaw and the clamping cover form a containing cavity for the leaky cable to penetrate through. The leaky cable fixture disclosed by the invention is integrally mounted and is convenient to mount; and an expansion anchor bolt fastening mode is adopted, multiple self-locking is achieved, safety and reliability are achieved, and the tensile bearing capacity and the shear bearing capacity are high.

The invention provides a water supplement and drainage control method for a hanging board and sunshade board combined support slope greening structure. The water supplement and drainage control methodinvolves a hanging board fixed to a slope, the hanging board is anchored to the slope through a plurality of anchor rods, a sunshade board is anchored to the top of the slope, a plurality of groovesare formed in the hanging board, and water storage tanks are installed at the positions of the grooves. A water supplement and drainage pipe penetrates into the hanging board and is communicated withthe water storage tanks, the sunshade board comprises two metal boards with holes, and the two metal boards are arranged on the top layer and the bottom layer respectively; a pressure plate is fixed to the inner side wall of the metal board on the top layer, springs are fixed to the bottom of the inner wall of the pressure plate, the bottoms of the springs are fixedly provided with an opening-closing plate, and the bottom of the opening-closing plate is provided with the metal plate on the bottom layer; soft water drainage pipes are communicated between the pressure plate and the opening-closing plate. The water supplement and drainage control method has the advantages that construction is convenient, fewer damage factors exist, water drainage and supplement can be facilitated, and later maintenance is facilitated and reduced.

The invention discloses a special drill bit for a tapered hole and an application method of the tapered hole. The special drill bit for the tapered hole consists of a drill handle, a blade face, a positioning ring and a flexible limit ring, wherein the drill handle and the blade face are integrated as a whole; the positioning ring and the flexible limit ring which are also integrated as a whole are sleeved on the drill handle; the included angle formed by the outer line of the blade face and the axial line of the drill bit is an acute angle; and the blade face is embedded with a semi-spiral blade edge, and the top end of the blade edge is a blade tip. The application method comprises the following steps: (1) pressing an expansion type special anchor bolt with a nylon sleeve into a tapered anchor bolt hole, so that the geometry formed after expansion of the expansion type special anchor bolt is matched with the tapered anchor bolt hole, and the surface of the anchor bolt can be tightly combined with the tapered hole to achieve anchoring effect; (2) drilling an opening on the root part of a required rib, inserting the rib into a tapered bar planting hole, expanding the opening of the rib with a wedge to form a tapered shape, and injecting anchor adhesive, so that the bar planting surface and the tapered hole can be tightly combined after solidification. The tapered hole drilled by the drill bit of the invention can significantly improve the anchorage strength and the bar planting solidity, and greatly enhance the pre-tightening force, bearing capacity, pull-out resistance and tensile bearing capacity of anchors or planted bars.

The invention belongs to a building structure member, particularly relates to a steel-concrete combination structure support member, and provides a steel tube fiber concrete support. The steel tube fiber concrete support is used for solving the problem that a frame structure has too large lateral displacement under the horizontal earthquake action and is seriously damaged after the earthquake and overcoming the defect that a steel structure support is large in steel consumption. Concrete mixed with steel fiber or synthetic fiber is poured into a circular steel tube, so that the concrete has certain tension resistance; meanwhile, in order to transmit supporting tension to the concrete inside the steel tube, a short steel tube with a bolt pin effect is arranged in the steel tube. In this way, the steel tube concrete support can bear large pressure and tension at the same time under the horizontal earthquake load action. A building structure with the steel tube fiber concrete support has excellent earthquake resistance and a high material utilization rate, and the advantages of being excellent in mechanical performance, convenient to construct, economical and reasonable can be fully exerted.

The invention relates to a recovery type anchor bar, comprising an outer sleeve steel pipe, a screw rod disposed in the outer sleeve steel pipe along the axial direction, an upper cover board fixed on the top of the outer sleeve steel pipe, a regulation nut disposed at center of the upper cover board, a lower cover board fixing on the bottom end of the outer sleeve steel pipe, an anchor cone disposed right under the lower cover board, and a plurality of upper connection boards disposed on bottom end of the lower cover board, wherein the upper portion of the screw rod is attached to the regulation nut through a screw thread, the lower portion of the screw rod is attached to the anchor cone. Each upper connection boards is hinged to the top of an upper pulling rod, bottom end of each upper pulling rod is hinged to the top of a lower pulling rod, bottom end of each lower pulling rod is respectively attached to the anchor cone through a pin. Object of the invention is to provide a recovery type anchor bar which is high in shearing resistance capacity, underground space saving, underground environment pollution-free, and steel saving.

The invention provides a tensile shielded cable. The tensile shielded cable is characterized by comprising conductors (1), wherein an insulating layer (2) coats the outside of each conductor (1); an inner shielding layer (3) coats the outside of the insulating layer (2); the inner shielding layer (3) is a copper wire and copper strip composite shielding layer; the copper wire and copper strip composite shielding layer comprises a plurality of soft round copper wires and copper strips coating the outside of the copper wires; an asphalt layer (6) coats the outside of the inner shielding layers (3); a steel wire layer (5) is arranged in the asphalt layer (6); a refractory layer (7) coats the outside of the asphalt layer (6); an outer sheath layer (8) coats the outside of the refractory layer (7); the steel wire layer (5) is surrounded by a plurality of steel wires to form an enclosed roundness; a filler (4) is arranged in a gap between the inner shielding layers (3) and the asphalt layer (6); and the outer sheath layer (8) is made of radiated cross-linking polyolefin or radiated cross-linking ethylene-propylene rubber.

The invention relates to the technical field of oil field oil extraction, in particular to a mechanical-hydraulic integrated releasing device. The mechanical-hydraulic integrated releasing device comprises an upper joint, a lower joint and a pawl. The upper joint and the lower joint are connected to the two ends of the pawl correspondingly. A releasing sleeve capable of moving in the axial direction of the pawl is arranged on the outer side of the pawl in a sleeving manner. A step is arranged on the outer wall of a ratchet of the pawl. A groove matched with the step is formed in the inner wall of the releasing sleeve. The step and the groove cooperate to limit the pawl. A releasing sleeve upper end is arranged between the releasing sleeve and the upper joint, one end of the releasing sleeve upper end is inserted in the releasing sleeve, and the other end of the releasing sleeve upper end is arranged on the outer portion of the upper joint in a sleeving manner and connected with the upper joint through a start pin. A pressure cavity is formed between the upper joint and the releasing sleeve upper end, a hydraulic cavity is formed in the upper joint, and two pressure transmission holes communicating with the pressure cavity are symmetrically formed in the side wall of the hydraulic cavity in the radial direction. According to the mechanical-hydraulic integrated releasing device, the problems that in the prior art, a mechanical releasing device is poor in resistance to tension, and the reliability of a hydraulic releasing device is not high are solved.

The invention relates to the field of beam bridge construction and discloses a steel beam segment. The steel beam segment comprises a left part and a right part. A gap formed in an opposite-pulling manner is formed between the left part and the right part. The left part and the right part are connected in a welded manner. A continuous combined beam bridge comprises two abutment piers and at least one middle pier located between the two abutment piers. The pier top of the middle pier is provided with the steel beam segment. Multiple combined beam segments are arranged on the two sides of the steel beam segment. A construction method of the continuous combined beam bridge includes the following steps that firstly, the steel beam segment formed by splicing the left part and the right part is provided, the left part and the right part of the steel beam segment are connected through bolts, and the bolts are tensioned; secondly, the combined beam segments are installed on the two sides of the steel beam segment till a steel beam is closed; and thirdly, the bolts on the steel beam segments are loosened gradually, and the left part and the right part of the steel beam segment are welded. By the adoption of the steel beam segment, the continuous combined beam bridge, and the construction method of the continuous combined beam bridge, the working performance of a concrete bridge panel can be greatly improved.

The invention discloses a grouting structure and grouting method for enhancing pulling resistance of a pile foundation after self-balance detection. The structure comprises an upper steel reinforcement cage and a lower steel reinforcement cage, and further comprises a loading and guide device. A loading cavity and a guide cavity are formed in the loading and guide device and are connected with a loading cavity grouting pipe and a guide cavity grouting pipe correspondingly. An outer cavity formed among the outer portion of the loading and guide device, the upper steel reinforcement cage and thelower steel reinforcement cage is connected with an outer grouting pipe. The grouting method comprises the steps that a, the loading and guide device with the loading cavity and the guide cavity is buried in the pile foundation; b, grout is injected into the loading cavity through the loading cavity grouting pipe, and self-balance detection of the pile foundation is carried out; c, after detection is completed, grout is injected into space formed between the upper steel reinforcement cage, the lower steel reinforcement cage and the loading and guide device through the outer grouting pipe; andd, grout is injected into the guide cavity through the guide cavity grouting pipe. According to the grouting structure and grouting method, the uplift bearing capacity and the overall structural strength of detected piles are obviously improved.

The invention discloses non-anchor-rod type multifunctional embedded box iron and an anchoring and installing method. The embedded box iron comprises a groove body and a main slide groove arranged onthe groove body. The embedded box iron is embedded and anchored in concrete through waist narrowing structures on the two sides of the groove body. A groove opening of the main slide groove is narrowed on the two sides, and a narrowed force bearing pat is formed at the groove opening. Antiskid teeth are arranged on the inner side of the force bearing part. A T-shaped slide groove is formed in theinner top of the main slide groove and can be split. An auxiliary slide groove with a conical section is formed in the inner top of the main slide groove, an auxiliary slider matched with the auxiliary slide groove in section shape is arranged in the auxiliary slide groove. A T-shaped slide groove is formed in the side, close to the groove opening of the main slide groove, of the auxiliary slider.A T-shaped bolt, a fastening nut, a fixing nut, a single-end bolt, a toothed butterfly-shaped gasket and a toothed butterfly-shaped nut are selected to be fixedly installed according to different load requirements of installation assemblies. The embedded box iron is low in installation cost, the tensile performance, longitudinal shearing performance and fatigue performance are greatly improved, the overall channel anchoring force is consistent, and the overall channel stability is improved.

The invention discloses a manufacturing method of twistless fabric and a product thereof. The method comprises the following working procedures: using a fibre rod prepared by medium staple fibre and staple fibre; taking the fibre rod as wrap and weft yarn after wrapped by Vitron; and dyeing, warping, starching, weaving and tidying according to design of pattern and flower color, wherein the weight ratio of Vitron yarn for wrapping to fibre rod body is within 10-35%, the tension at the time of beaming is not more than 8-13% of warp breaking tenacity, and weaving machine speed at the time of weaving is 15-20% lower than speed for weaving the traditional twisted fabric.

The invention discloses a method of reinforcing low-strength concrete beams and slabs. The method includes: dividing a beam-slab, to be reinforced, into two parts, namely a pull region and a stress region; subjecting the stress region to reinforcement by dry-mixed self-compacting concrete replacement; cleaning the surface of concrete of the pull region, and pasting a layer of permeable crystalline compacting agent to enhance concrete 5mm deeper in the surface of the concrete of the pull region, meeting the requirements in standards for the pasting method, and pasting carbon fiber cloth or steel plates to reinforce the pull region. The method has the advantages that the fact that the concrete with the surface pasted permeable crystalline compacting agent has higher compressive strength against concrete structure is well utilized, the structure is reinforced by the original pasting method, the durability problem of low-strength concrete is well solved by making use of compactness and water tightness in the compacting agent, and a substitution method cab be applied to low-strength concrete.

The invention relates to the technical field of medical materials, in particular to a preparation method of an anti-adhesion membrane for preventing and treating myophagus adhesion. The preparation method comprises the following steps: S1, acquiring a fresh amnion; S2, preparing a decellularized amnion; S3, loading the celecoxib; and S4, carrying out freeze-drying treatment. The invention also discloses an anti-adhesion membrane for preventing and treating myophagus adhesion, which is prepared by the method and comprises an acellular amniotic membrane, and a plurality of celecoxib particles are attached to the acellular amniotic membrane. The preparation method has the beneficial effects that according to the prepared anti-adhesion membrane, the amniotic membrane matrix containing various bioactive substances is loaded with celecoxib, so that endogenous healing of tendons can be effectively promoted, and adhesion caused by exogenous healing is reduced.